KR0122691Y1 - Cathode support structure of mangnetron - Google Patents

Abstract

The present invention relates to a negative electrode support structure of the magnetron, in order for the negative electrode support structure of the magnetron according to the present invention in the magnetron oscillating high frequency, it is arranged in parallel to the lower end hat (3) from the center lead wire (35) ), The outer ceramic lead 27 and the insulating ceramic 41 having a fixing hole formed so as to support the other ends of the central and outer lead wires 35 and 27, respectively, and the center fixing of the insulating ceramic 41 The center lead wire 35 fixed to the hole 42 is supported from the upper side of the insulating ceramic 41 by L from the upper side, and the other side is fixed to the upper surface of the insulating ceramic 41 so that the second side is fixed. The negative electrode portion is integrally formed between the conductive terminal 34 electrically connected to the external connection terminal 31 and the bent portion of the upper flat surface 34a and the lower flat surface 34b of the conductive terminal 34. To prevent vibration And a metal plate 32 fixed to the steel piece 33 and the upper surface of the insulating ceramic 41 to electrically connect the outer lead wire 27 and the first external connection terminal 30. Characterized by the negative electrode support structure of the magnetron, while reducing the manufacturing cost and has the effect of improving the vibration resistance and the vibration resistance of the negative electrode portion.

Description

Magnetron Support Structure

1 is a partially broken cross-sectional view of a cathode structure in a conventional magnetron,

2 is a partial sectional view of the magnetron cathode structure according to an embodiment of the present invention,

FIG. 3a is an enlarged cross-sectional view of the cathode part partially cut away from FIG.

3b is an enlarged perspective view of the conductive terminal;

4 is a cross-sectional view taken along the line AA 'of FIG. 3A,

* Explanation of symbols for the main parts of the drawings

1: Filament 2: Top end hat

3: lower end hat 4, 5: first and second lead wires

6, 18: Metal pipe 7: Insulator

8, 9: Terminals 10, 11: Third and fourth lead wires

17: Antenna 18: annular groove

27: outer lead wire 30: first external connection terminal

31: Second external connection terminal 32: Metal plate

33: Enhancement 34: Challenge Terminal

35: center lead line 39, 42: fixing hole

41: insulating ceramic

The present invention relates to a magnetron used in a microwave heating apparatus such as a microwave oven, and relates to a cathode support structure of a magnetron having an improved cathode support structure of a magnetron.

1 is a sectional view schematically showing a cathode structure of a conventional magnetron. In the same figure, a spiral filament 1 made of thorium and tungsten has a pair of molybdenum end hats 2 and 3 fixed to both ends thereof, and the upper end hat 2 has a filament 1 attached thereto. The second lead wire 5 made of molybdenum penetrates in contact with the non-contact is fixed, and the lower end hat 3 has the same material as the second lead wire 5 supporting the upper end hat 2 and the filament 1. The first lead wire 4 is fixed. The other ends of the first and second lead wires 4 and 5 are connected to the third and fourth lead wires 10 and 11 in the through holes formed in the insulator 7 which is the cathode support structure of the magnetron. It is electrically connected. In other words, the third and fourth lead wires 10 and 11 connected to the lower ends of the lead wires 4 and 5 are welded and fixed to the metal layer 7B deposited on the outer surface of the insulator 7. It is brazed to the terminal pieces 8 and 9 and is electrically connected. In addition, a metal layer is also deposited on the outer circumferential portion 7D of the opening portion of the insulator 7, and the metal tube 6 is hermetically weld-bonded to the outer circumferential portion 7D, and the flange portion 6a of the metal tube 6 is fixed. Although not shown above, the pole pieces and the anode body are hermetically welded.

However, in the magnetron structure of the magnetron thus constructed, as shown in FIG. 1, the upper end hat of the cathode portion from the sealing position of the pair of first and second lead wires 4 and 5 inserted into the insulator 7 is shown. Since the length (1) to (2) is long, the length of the lead wire made of expensive molybdenum is long, and the manufacturing cost is high, and when it is impacted from the outside, it occurs at the leading end of the lead wire, that is, the upper end hat (2). It is easy to damage the negative electrode which is susceptible to shock because the amplitude of the vibration is large, and the pair of first and second lead wires 4 and 5 inserted in the insulator 7 are connected to the respective terminal pieces 8 and 9. ), There is a problem that the terminal piece is small and is difficult to assemble because it is assembled in the recess 7c formed in the insulator 7.

In addition, in the cathode support structure of the magnetron configured as described above, when the center of the cathode, i.e., the filament 1 made of thorium-tungsten alloy, is out of the center of the anode body (not shown), the filament 1 and the anode vane are in close proximity to the oscillation. The leakage current, which is a lossy current that does not contribute, increases and the oscillation efficiency of the magnetron decreases, resulting in an uneven distribution of hot electrons generated in the filament (1). The non-uniform electrical energy is applied to each cavity resonator, which not only lowers the microwave output, but also locally the temperature of the filament (1) in the area where the hot electrons are concentrated so that the thorium inside the filament (1) necessary for hot electron radiation The rapid evaporation causes the filament 1's ability to radiate hot electrons sharply to deplete the magnetron. In addition to the problem of rapidly shortening the lifespan, a second penetrating filament 1 of the pair of first and second lead wires 4 and 5 that determines the position of the filament 1 in the magnetron When the lead wire 5 is assembled at the two positions, that is, at the point where the lead wire 5 is bent at the point A and the point B, as shown in FIG. The problem of deviation from the center of the filament 1 is generated, and the cathode part is biased from the center of the anode body (not shown), which reduces the efficiency and output of the magnetron, and also shortens the life of the magnetron. In order to do so, the position of the second lead wire 5 must be adjusted after assembling of the negative electrode part, so that an assembly process is added to increase the manufacturing cost.

Therefore, the present invention has been made in view of the above-mentioned problems, and the object of the present invention is to shorten the expensive molybdenum lead wire to reduce the manufacturing cost and at the same time precisely and coaxially arrange the negative electrode portion at the center of the positive electrode cylinder. Accordingly, the present invention provides a magnetron negative electrode support structure that can improve the oscillation efficiency of the magnetron and improve the seismic resistance of the negative electrode portion.

In order to achieve the above object, the negative electrode support structure of the magnetron according to the present invention is a magnetron that oscillates high frequency, and is arranged in parallel with the center lead wire to support the lower end hat and the outer lead wire, and the center and outer lead wires. An insulating ceramic having fixing holes formed to support the other end thereof, and a central lead wire fixed to the center fixing hole of the insulating ceramic are supported by an upper portion of the insulating ceramic from the upper side of the insulating ceramic and at the same time, the other side of the insulating ceramic A reinforcing piece which is formed integrally between the bent portion of the upper and lower flat surfaces of the conductive terminal and is electrically connected to the second external connection terminal and fixed to the upper surface of the reinforcing piece. And the outer lead wire and the first external connection end fixed to the upper surface of the insulating ceramic. Characterized in that the negative electrode support structure of the magnetron, characterized in that made of a metal plate electrically connected to the ruler.

In this configuration, a pair of lead wires made of expensive molybdenum, which determines the position of the filament, can be shortened, which can reduce manufacturing cost, and a pair of lead wires are short, and one of the lead wires is insulated ceramic. The structure is clamped by the conductive terminal at a predetermined distance L from the upper side, and since the reinforcing piece is integrally formed between the bent portions of the upper and lower flat surfaces of the conductive terminal, vibration of the vicinity of the filament, that is, the cathode portion Can be prevented, and the seismic resistance is improved, and the cathode portion can be easily coaxially mounted at the center of the anode cylinder, thereby preventing the efficiency and output of the magnetron from being lowered.

Since the pair of lead wires has a straight shape parallel to each other, it is not necessary to bend one lead wire in two places of the lead wires as in the prior art, so that the lead wires are arranged coaxially in the center of the anode cylinder after assembly of the cathode portion. In order to eliminate the need for adjusting the position of the lead wires, the length of the lead wires is shortened, so that the manufacturing cost can be reduced.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected about the same part as FIG. 1, and the overlapping description is abbreviate | omitted.

FIG. 2 is a partially broken cross-sectional view of the negative electrode support of the magnetron according to an embodiment of the present invention, FIG. 3a is a partially enlarged cross-sectional view of FIG. 2, FIG. 3b is a perspective view of the conductive terminal, and FIG. A-A ') is a cross-sectional view.

As shown in FIGS. 2 to 4, a plurality of vanes 16 are formed on the inner surface of the anode cylinder 12 formed in a cylindrical shape by a copper plate or the like to form a plurality of resonant cavities. And vane 16 to form an anode portion. In the vicinity of the central axis of the anode body 12, a working space is formed by the tip portions of the plurality of vanes 16, and a thorium-tungsten alloy or the like is spirally wound to emit, for example, hot electrons. The filament 1 wound up is arrange | positioned. The upper and lower end hats 2 and 3 are fixed to both ends of the parallax 1 so as to prevent radiating hot electrons in the direction of the central axis, which is a loss current which does not contribute to oscillation, and the lower end hat 3 The outer lead wire 27, which is an outer support body, is welded and fixed to the bottom surface of the upper supporter, and the central lead wire 35, which is a central support body, is connected to the upper end hat 2 through a through hole formed near the center of the lower end hat 3. Weld is fixed. Here, the center lead wire 35 penetrates non-contact with the lower end hat 3 and the filament 1, and these lead wires 27 and 35 are all made of molybdenum extending in a straight line. To supply the operating current to the filament 1.

In addition, funnel-shaped pole pieces 13 and 14 which are fixed to both openings of the anode cylinder 12 to form a magnetic path uniformly in the working space are formed at both ends of the anode cylinder 12. The outer edges of both ends remaining at the cut position are bent and fixed, and then welded tightly. Upper and lower portions of the funnel-shaped magnetic poles 13 and 14 are metal tubes 18 and 6 for sealing the inside of the positive electrode body 12 with a vacuum, respectively, or an intermediate portion of the magnetic poles 13 and 14 or the positive electrode body 12. Airtightly fixed to the edge part of () by welding, and ring-shaped permanent magnets 20 and 21 are arrange | positioned at the predetermined distance to the outer surface of this metal pipe 18 and 6, respectively. In addition, an output side ceramic tube 36 formed in a ceramic cylindrical shape is fixedly connected to the upper opening end of the metal tube 18 by welding or the like, and an upper end portion of the output side ceramic tube 36 is made of copper. The exhaust pipe 39 is fixed to the other side, and the other side of the antenna 17 coupled to one side to the vane 16 so as to output the high frequency oscillated in the resonance cavity near the inner central portion of the exhaust pipe 39 In addition, the outer surface of the exhaust pipe (39) to protect the welding fastening portion of the exhaust pipe (39) and to prevent sparking by the electric field concentration and high frequency antenna antenna while acting as a high frequency output antenna at the same time (37) This is covered.

In addition, on the outer circumferential surface of the anode cylinder 12, a plurality of aluminum heat sinks 15 extending in the radial direction of the tube are fitted and arranged by the clamp members 24 fixed to the yokes 22a and 23b. ) Is covered with the permanent magnets 20 and 21 by the yoke 22a and 23b. In addition, a first gasket 29 formed of a metal mesh or the like between the upper side of the permanent magnet 20 on the output side and the opening of the yoke 22a to prevent radio leakage of high frequency waves is provided in the second gasket 38. It is arrange | positioned through the.

On the other hand, the lower ends of the outer and center lead wires 27 and 5 are inserted into and fixed to the metal plate 32 and the fixing holes 39 and 42 formed in the insulating ceramic 41, respectively, to the upper surface of the insulating ceramic 41. The conductive terminals 34 are in contact with each other and are electrically connected to the first and second external connection terminals 30 and 31, respectively.

Next, the structure of the insulating ceramic 41, which is a main part of the present invention, will be described.

As shown in FIGS. 3 and 4, the insulating ceramic 41 has a cylindrical shape, and the upper surface thereof is electrically connected between the metal tube 6 and the first and second external connection terminals 30 and 31. An annular concave groove 18 is formed at an inner side at a predetermined distance from the outer surface of the insulating ceramic 41 so as to ensure insulation, and a fixing hole for fixing the center lead wire 35 in the center portion thereof. 42 and a fixing hole for fixing the outer lead wire 27 by being biased from the diameter line of the insulating ceramic 41 connecting the fixing hole 42 and the first and second external connection terminals 30 and 31. 39 are formed, respectively. In addition, a concave groove 42a having a larger diameter than that of the fixing hole 42 is formed on the upper side of the fixing hole 42 to prevent insulation breakdown between the outer and center lead lines 27 and 35. The first external connection terminal 30 and the outer lead between the concave groove 18 on the top and the concave groove 42a formed in the upper part of the fixing hole 42 via a molybdenum-manganese paste layer (not shown). An electrically conductive metal plate 32 having a generally half moon or a fan shape is fixed flat so as to electrically conduct the line 27, and the annular recess 18 and the fixing hole (an opposite side of the metal plate 32) are fixed. The center lead wire 35 is separated from the metal plate 32 by a predetermined distance between the concave grooves 42a formed in the upper portion of the insulator 42 and at a predetermined height L from the upper surface of the insulating ceramic 41. Through hole type to support At the same time, the conductive terminal 34 in which the reinforcing piece 33 is integrally formed between the bent portions of the upper flat surface 34a and the lower flat surface 34b is provided through a paste layer of molybdenum-manganese agent (not shown). The second external connection terminal 31 and the center lead wire 35 are fixed to electrically conduct. Specifically, the conductive terminal 34 is electrically connected to the central lead wire 35 by an L distance from an upper surface of the insulating ceramic 41 so as to prevent vibration of the cathode portion, thereby providing an operating current to the filament 1. The reinforcing piece 33 is integrally formed between the bent part of the upper flat surface 34a and the lower flat surface 34b so as to supply.

In the above description, the fixing hole 42 is formed deeper than the fixing hole 39 so as to prevent vibration of the cathode portion, and the fixing hole 39 for fixing the outer lead wire 27 is formed of the insulating ceramic 41. If the 1st and 2nd external connection terminals 30 and 31 and the center lead line 35 do not correspond to the diameter line arrange | positioned in a straight line, it is easy to assemble if it is located in parallel with the center lead line 35 by making them convenient from a diameter line. In addition, since the position of the outer lead wire 27 can be freely fixed, the working clearance width can be increased, so that the assembly work efficiency can be improved, and the cathode portion can be easily positioned at the center of the anode cylinder 12. Not only can the efficiency and output be improved, but the manufacturing cost can be reduced.

Next, the operation effect of the negative electrode support structure of the magnetron according to the present invention configured as described above will be described.

When power is applied through the first and second external terminals 30 and 31, the second external connection terminal 31 → conductive terminal 34 → middle lead wire 35 → upper end hat 2 → The closed circuit is constituted by the filament (1), the lower end hat (3), the outer lead wire (27), the metal plate (32), and the first external connection terminal (30) so that the operating current is supplied to the filament (1). Heated. At this time, when a predetermined voltage is supplied to the anode cylinder 12, hot electrons are radiated from the filament 1. The hot electrons act in the magnetic field of the magnetic poles 13 and 14 to generate high frequency oscillation, and the high frequency output is introduced into the oven of the microwave oven via the exhaust pipe 39 and the antenna cap 37 through the antenna 17. Radiated.

By the way, the negative electrode support structure of the magnetron according to the present invention has a fixing hole 39 formed in the insulating ceramic 41 in parallel with the outer lead line 27 and the center lead line 35 supporting the plyment 1 in a straight line. And 42), the lower part is inserted, so that the center part of the center lead wire 35 does not need to be bent in two places, and the length of the outer and center lead wires 27 and 35 made of expensive molybdenum is shortened. It is possible to assemble the cathode part easily, thereby lowering the manufacturing cost, and the fixing holes 42 for shortening the lengths of the outer and center lead wires 27 and 35 and inserting and fixing the lower end of the center lead wire 35. Since the depth of the hole is formed deeper than the fixing hole 39 into which the outer lead wire 27 is inserted, the center lead wire 35 is firmly supported by the fixing hole 42 and from the upper surface of the insulating ceramic 41. By a certain height (L) Since being electrically connected to the former terminal 34, a through-hole formed in, and fixed position, the vibration resistance is improved.

In addition, since the reinforcing pieces 33 are integrally formed between the bent portions of the upper flat surface 34a and the lower flat surface 34b of the conductive terminal 34, the shock resistance of the negative electrode portion is improved.

In addition, since it is not necessary to bend the center of the linear center lead line 35 in two places, it is possible to prevent the dimensional error occurring during the bending, and to adjust the position of the center lead line 35 after assembling the cathode part. Not only is it necessary, but also the polarizing portion can be positioned at the center of the anode cylinder 12, so that the efficiency and output of the magnetron can be improved, and the assembly can be easily performed to reduce the manufacturing cost.

As described above, according to the negative electrode support structure of the magnetron according to the present invention, an annular concave groove is formed at an inner side at a predetermined distance from the outer surface of the insulating ceramic, and a hole for fixing the center lead wire is located near the center. Forming holes for fixing the outer lead wires, respectively, to the outside from the hole for forming, and forming a concave groove of a large diameter in order to prevent breakdown in the upper portion of the fixing hole of the center lead wire, and then to the outside of the external connection terminal A metal plate is evenly deposited on the upper part between the annular recess and the fixing hole of the center lead wire so as to conduct the lead wire, and between the annular recess and the fixing hole of the center lead wire on the opposite side of the metal plate. One side is deposited on the upper surface of the insulating ceramic at a predetermined distance from the metal plate. Since the other side is separated by a height L from the insulating ceramic, the center lead wire is electrically connected by the conductive terminal, and the center and outer lead wires are inserted into and fixed in the respective fixing holes in a straight line in parallel. It is not necessary to bend the center of the center lead line as in the prior art, and it is not necessary to adjust the dimensional error occurring at the time of bending, and to shorten the length of the center and outer lead lines made of expensive molybdenum. In addition, the cathode portion can be positioned at the center of the anode body to improve the efficiency and output of the magnetron, and at the same time, the lower portion of the center lead wire is separated from the upper surface of the insulating ceramic to the conductive terminal. Electrical connection, and the upper flatness of the conductive terminal Since the reinforcing piece is integrally formed between the bent portion of the surface and the lower flat surface, there is a very excellent effect that the shock resistance of the cathode portion is also improved.

Claims (3)

In the magnetron oscillating high frequency, the outer lead line 27 which is disposed in parallel with the center lead line 35 to support the lower end hat 3 and the center and outer lead lines 35 and 27. Insulating ceramics 41, each having a fixing hole formed to support the other end, and a central lead wire 35 fixed to the central fixing hole 42 of the insulating ceramic 41 from the upper surface of the insulating ceramic 41. The conductive terminal 34 and the conductive terminal 34 which are separated from each other by L and are supported by the upper side, and the other side is fixed to the upper surface of the insulating ceramic 41 and electrically connected to the second external connection terminal 31. A reinforcing piece 33 integrally formed between the bent portion of the upper flat surface 34a and the lower flat surface 34b of the c) to prevent vibration of the negative electrode, and fixed to the upper surface of the insulating ceramic 41 An electric bottom on the outer lead wire 27 and the first external connection terminal 30 The cathode support structure of the magnetron, which is characterized by being a metal plate (32) connecting to. The conductive terminal 34 has a through hole through which the center lead wire 35 passes so as to support the center lead wire 35 away from the upper surface of the insulating ceramic 41 by L. Cathode support structure of the magnetron, characterized in that. The method of claim 1, wherein the first and second external connection terminals 30, 31 and the center lead wire 35 is fixed in a line on the diameter line of the insulating ceramic 41 and the outer lead wire 27 is Magnetron support structure of the magnetron, characterized in that the arrangement is fixed to be convenient from the diameter line.