JP2006040574A - Magnetron - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a liquid cooling type magnetron safely carrying out a continuous operation through prevention of short-circuit accidents caused by leakage of cooling liquid inside a power source part case. <P>SOLUTION: The magnetron 11 arranged inside the power source part case 7 is provided with: a cooling block 54 with which a cylindrical anode body is insertion-coupled; a frame-shaped yoke 6 connected to the cooling block 54; a relay block 81 fitted to the frame-shaped yoke 6 with an end each of a liquid supply path and a liquid exhaust path formed in penetration exposed outside the power source part case 7; and heat-resistant piping 83, 84 communicating the liquid supply path and liquid exhaust path of the relay block with a liquid flow path 53. A cooling liquid supply tube 71 and a cooling liquid returning tube 72 from outside are connected to the liquid supply path and the liquid exhaust path of the relay block 81 exposed outside the power source part case 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid-cooled magnetron disposed in a power supply unit casing of a processing apparatus that performs a predetermined process using microwaves.

The cylindrical anode body constituting the magnetron needs to be cooled because heat loss occurs during operation and the temperature becomes high.
A magnetron mounted in a microwave oven for home use has an output of about 900 W and a relatively small output. Therefore, for cooling the cylindrical anode body, a plurality of heat radiation plates (fins) are provided on the outer periphery of the cylindrical anode body. In addition, an air cooling method is employed in which an air flow is sent to the heat radiating plates.

However, since the magnetron mounted on an industrial processing apparatus (for example, a garbage drying processing machine) that performs a predetermined process using microwaves has an output of about 1.5 to 5 kW and a large output, air cooling Cooling by this method cannot be expected to provide a sufficient cooling effect.
Therefore, in the case of a magnetron mounted on an industrial processing apparatus, a liquid cooling method using a cooling liquid as appropriate is generally employed for cooling the cylindrical anode body.

4 to 6 show a conventional example of a magnetron mounted on an industrial processing apparatus.
The magnetron 1 shown here has a cylindrical anode body 3 containing a cathode body on the center axis inside, and an interrupt block body 52 having an anode fitting hole 51 into which the cylindrical anode body 3 is fitted. As shown in FIG. 6, a microwave is used in a configuration including a cooling block 54 in which a liquid flow path 53 for inserting a cooling liquid is formed and a frame yoke 6 connected to the cooling block 54. It is disposed in the power supply unit housing 7 of the processing apparatus that performs predetermined processing.
Then, the cylindrical anode body 3 is cooled by the cooling liquid that flows from the outside to the liquid flow path 53 of the cooling block 54.

  As shown in FIG. 5, the block main body 52 includes a radial split 56 communicating with the anode fitting hole 51, and a pair of flange portions 57 a and 57 b facing each other with the split 56 interposed therebetween are tightened with bolts 58. The inner circumference of the anode fitting hole 51 is in close contact with the outer circumference of the cylindrical anode body 3, and the heat conduction from the cylindrical anode body 3 to the cooling block 54 is improved.

  The liquid flow path 53 of the cooling block 54 is connected to the two flow path holes 55a and 55b which are drilled substantially in parallel with each other from one end surface of the block, and the two flow path holes 55a and 55b communicate with each other. The three channel holes 55a, 55b, 55c with the communication channel hole 55c drilled from the other end face are formed in a substantially U-shape. Of the three channel holes 55 a, 55 b and 55 c, the open end of the communication channel hole 55 c is sealed by screwing a plug 59. Thereby, the liquid flow path 53 functions as a series of liquid flow paths in which the open end of the liquid flow path 55a is the liquid supply port 53a and the open end of the liquid flow path 55b is the drainage port 53b, for example.

  As shown in FIG. 6, an external coolant supply pipe 73 and an external coolant supply pipe 73 are connected to the liquid supply port 53 a and the drainage port 53 b of the cooling block 54 disposed in the power supply unit housing 7 via pipe joints 71 and 72. The coolant return pipe 74 is connected to supply and drain the coolant to the cooling block 54 (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 5-54805 JP-A-4-284334

However, the coolant supply pipe 73 and the coolant return pipe 74 connected to the cooling block 54 from the outside are usually resin hoses formed of, for example, silicon resin, and have low heat resistance. 7 may be melted by the radiant heat from the heat generating part in 7 and may cause a short circuit accident of the power supply components in the power supply housing 7.
The plug 59 and the pipe joints 71 and 72 are both fixed to the cooling block 54 by screwing, and tightening is loosened by repeated expansion and contraction due to heating, so that the coolant can be supplied from the connection portion of these components. May leak and cause a short circuit accident of the power supply components in the power supply housing 7.

  The present invention has been made in view of the above circumstances, and an object thereof is to prevent occurrence of a short circuit accident due to leakage of the cooling liquid in the power source housing and to perform a liquid cooling type magnetron that can be operated safely and continuously. Is to provide.

The above object is achieved by the following configuration.
(1) A cylindrical anode body, a cooling block that is fitted to the cylindrical anode body and cools the cylindrical anode body with a coolant flowing from the outside, and a frame-shaped yoke connected to the cooling block, A magnetron disposed in a power supply unit casing of a processing apparatus that performs predetermined processing using waves,
A relay block attached to the frame-shaped yoke so that a liquid supply path and a liquid discharge path are formed to penetrate and one end of the liquid supply path and the liquid discharge path is exposed to the outside of the power source housing. And a heat-resistant pipe connecting the other end of the liquid supply path and liquid discharge path of the relay block to the cooling block,
A magnetron characterized in that an external coolant supply pipe and a coolant return pipe are connected to a liquid supply path and a liquid discharge path opened at one end of the relay block.

  (2) In the above (1), the liquid flow path of the cooling block communicates with the two flow path holes that are perforated substantially in parallel with each other from one end surface of the block. It is formed in a substantially U-shape by three channel holes with communication channel holes drilled from the other end face of the block, and the open end of the communication channel hole is sealed by brazing the plug. Magnetron characterized by being stopped.

In the magnetron described in (1) above, for example, an external coolant supply pipe and a coolant return pipe in which a resin hose with low heat resistance is used are connected to a relay block exposed to the outside of the power supply unit housing In addition, since it is not drawn into the power supply unit housing, heating due to radiant heat from the heat generating unit in the power supply unit housing can be avoided. And, for the circulation of the cooling water from the outside, the pipe connecting the cooling block and the relay block uses heat-resistant piping, so it melts even if it receives radiant heat in the power supply housing There is no.
Therefore, leakage of the coolant due to melting of the coolant channel in the power supply unit housing can be prevented, and a short-circuit accident due to coolant leakage can be prevented, and safe operation can be continued.

  In the magnetron described in (2) above, the fixing / sealing of the plug to the cooling block is changed to brazing instead of the conventional screwing, so that the fixing state is maintained even after repeated thermal expansion. Without being loosened, it is possible to completely prevent the leakage of the coolant due to the looseness of the screwing portion such as the plug, and it is possible to prevent the occurrence of a short circuit accident due to the leakage of the coolant.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a magnetron according to the present invention will be described in detail with reference to the drawings.
In the embodiment described below, the same components as those already described with reference to FIGS. 4 to 6 are denoted by the same or corresponding reference numerals in the drawings, and the description thereof is simplified or omitted.

FIG. 1 shows an embodiment of a magnetron according to the present invention.
The magnetron 11 shown here has a cylindrical anode body 3 that accommodates a cathode body on the center axis inside, and an interrupt block main body 52 having an anode fitting hole 51 into which the cylindrical anode body 3 is fitted. A cooling block 54 in which a liquid flow path 53 for inserting a cooling liquid is formed, a frame-shaped yoke 6 connected to the cooling block 54, and a relay fastened to the frame-shaped yoke 6 by screws 62 and attached. As shown in FIG. 3, the block 81 and the heat-resistant pipes 83 and 84 for connecting the relay block 81 and the frame-shaped yoke 6 are used to perform predetermined processing. Is disposed in the power supply unit casing 7 of the processing apparatus.
Then, the cylindrical anode body 3 is cooled by the coolant that flows from the outside to the liquid flow path 53 of the cooling block 54 via the relay block 81 and the heat resistant pipes 83 and 84.

In the above configuration, the cylindrical anode body 3, the cooling block 54, the frame-shaped yoke 6, the power source casing 7, and the like are the same as those of the magnetron shown in FIGS.
That is, as shown in FIG. 2, the block body 52 includes a radial split 56 communicating with the anode fitting hole 51, and a pair of flange portions 57 a and 57 b facing each other with the split 56 interposed therebetween are bolts (not shown). By tightening with, the inner periphery of the anode fitting hole 51 is in close contact with the outer periphery of the cylindrical anode body 3, and the heat conduction from the cylindrical anode body 3 to the cooling block 54 becomes good.

  Further, the liquid flow path 53 of the cooling block 54 communicates with the two flow path holes 55a and 55b that are drilled substantially in parallel with each other from one end surface of the block and the two flow path holes 55a and 55b. It is formed in a substantially U shape by three flow path holes 55a, 55b, 55c with a communication flow path hole 55c drilled from the other end face of the block. Of the three channel holes 55 a, 55 b and 55 c, the open end of the communication channel hole 55 c is sealed by brazing a plug 86. Thereby, the liquid flow path 53 functions as a series of liquid flow paths in which, for example, the open end of the liquid flow path 55a is the liquid supply port 53a and the open end of the liquid flow path 55b is the drainage port 53b.

  In the relay block 81, a liquid supply path and a liquid discharge path are formed so as to penetrate from one end to the other end. As shown in FIGS. 1 and 3, one end where the liquid supply path and the liquid discharge path are open is a power source. It is attached to the frame yoke 6 so as to be exposed to the outside of the partial housing 7.

The heat resistant pipes 83 and 84 are both copper tubes having higher heat resistance than the resin hose.
The heat resistant pipe 83 connects the other end opening of the liquid supply path formed through the relay block 81 to the liquid supply port 53 a of the liquid flow path 53 of the cooling block 54. The heat-resistant pipe 84 connects the other end opening of the liquid discharge path formed through the relay block 81 to the liquid discharge port 53 b of the liquid flow path 53 of the cooling block 54. Further, the connection portion of each copper tube to each block is fixed by brazing and at the same time hermetically sealed.

  Then, a coolant supply pipe 73 and a coolant return pipe 74 from the outside using a resin hose are connected to the liquid supply path and the liquid discharge path opened at one end of the relay block 81 via pipe joints 71 and 72, respectively. It is connected.

In the magnetron 11 described above, for example, the external coolant supply pipe 73 and the coolant return pipe 74 in which a resin hose having low heat resistance is used are connected to the relay block 81 exposed to the outside of the power supply unit housing 7. In addition, since it is not drawn into the power supply unit housing 7, heating due to radiant heat from the heat generating unit in the power supply unit housing 7 can be avoided. And, since the pipe connecting the cooling block 54 and the relay block 81 uses the heat resistant pipes 83 and 84 for circulating the cooling water from the outside, the radiant heat in the power source housing 7 is used. Even if it receives, it does not melt.
Therefore, the leakage of the coolant due to the melting of the coolant line in the power supply unit housing 7 can be prevented, and a short circuit accident due to the leakage of the coolant can be prevented, so that the continuous operation can be performed safely.

  Further, in the magnetron 11 of the above-described embodiment, the fixing and sealing of the plug 86 to the cooling block 54 is changed to brazing instead of the conventional screwing, and the heat resistance to the cooling block 54 is also improved. Since the connection of the pipes 83 and 84 is changed to brazing instead of screwing by the conventional pipe joints 71 and 72 (see FIG. 5), the fixed state is loosened even if subjected to repeated thermal expansion. Therefore, the leakage of the coolant due to the looseness of the screwing portion such as the plug can be completely prevented, and the occurrence of the short circuit accident due to the leakage of the coolant can be prevented.

It is a side view of the attachment state to the power supply part housing | casing of one Embodiment of the magnetron based on this invention. FIG. 2 is a connection diagram of a cooling block and a relay block used in the magnetron of FIG. 1. It is a top view of the state attached to the power supply part housing | casing of the magnetron shown in FIG. It is a side view of the conventional magnetron. It is a perspective view of the cooling block shown in FIG. It is a top view of the state attached to the power supply part housing | casing of the magnetron shown in FIG.

Explanation of symbols

3 Cylindrical anode body 6 Frame-shaped yoke 7 Power supply housing 51 Anode fitting hole 52 Block body 53 Liquid flow path 53a Liquid supply port 53b Drainage port 54 Cooling block 55a, 55b Channel hole 55c Communication channel hole 81 Relay block 83, 84 Heat resistant piping

Claims (2)

A cylindrical anode body, a cooling block that is fitted to the cylindrical anode body and cools the cylindrical anode body with coolant flowing from the outside, and a frame-shaped yoke connected to the cooling block use microwaves. A magnetron disposed in a power supply unit casing of a processing apparatus that performs predetermined processing,
A relay block attached to the frame-shaped yoke so that a liquid supply path and a liquid discharge path are formed to penetrate and one end of the liquid supply path and the liquid discharge path is exposed to the outside of the power source housing. And a heat-resistant pipe connecting the other end of the liquid supply path and liquid discharge path of the relay block to the cooling block,
A magnetron characterized in that an external coolant supply pipe and a coolant return pipe are connected to a liquid supply path and a liquid discharge path opened at one end of the relay block.   The liquid flow path of the cooling block was perforated from the other end face of the block so as to communicate with the two flow path holes that were perforated substantially parallel to each other from one end face of the block. 3. The communication channel hole is formed in a substantially U shape by three flow channel holes, and the open end of the communication channel hole is sealed by brazing a plug. The magnetron according to 1.

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