Patent ID: 12191106

DESCRIPTION OF EMBODIMENTS

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First Embodiment

FIG.1Ais a longitudinal sectional view showing a configuration of an industrial magnetron according to a first embodiment of the present invention.FIG.1Bis an enlarged view of the principal parts ofFIG.1A. The present embodiment is an example in which the present invention is applied to an industrial magnetron that includes a refrigerant flow path that makes only one circuit of the anode cylindrical body.

Overall Configuration

As illustrated inFIG.1A, an industrial magnetron100is a magnetron that ranges from the low-output type having an output of approximately 2 kW to the high-output type having an output of approximately 15 kW. In the case of a low-output type magnetron, sufficient cooling can be achieved even with a configuration in which the refrigerant makes one circuit of the refrigerant flow path.

The industrial magnetron100includes a cathode filament1formed into a helical shape as a heat emission source, a plurality of anode vanes2arranged around the cathode filament1, an anode cylindrical body3(anode cylinder) supporting the anode vanes2, and a pair of permanent magnets4a,4bhaving an annular shape and arranged at upper and lower ends of the anode cylindrical body3. The anode vanes2and the anode cylinder3are integrated by fixing using brazing or the like or by an extrusion molding method, and constitute some of the anode portions.

Note that “circulate around” means “to circle around; to go around there; and around same; surroundings”. However, in the present specification, as shown inFIG.1A, even if a refrigerant flow path210does not turn by 360 degrees around the anode cylindrical body3, the refrigerant flow path210goes around the anode cylindrical body3, and therefore the aspect shown inFIG.1Ais also referred to as circulation (circulation around the anode cylindrical body). Incidentally, in the example ofFIG.1A, the number of circuits is one, and in the example ofFIG.8to be described below, the number of circuits is three because a turn is made in two places.

The plurality of anode vanes2are arranged radially around the cathode filament1. An active space is formed between the cathode filament1and the anode vanes2. A region surrounded by the two adjacent anode vanes2and the anode cylinder3is a resonant cavity.

A pair of magnetic poles5aand5bmade of a ferromagnetic material such as soft iron are disposed between the anode cylindrical body3and the permanent magnets4aand4b, respectively.

An antenna lead7is electrically connected to the anode vanes2. The other end of the antenna lead7is sealed together with an exhaust pipe8. The antenna lead7and the exhaust pipe8are electrically connected to each other. The exhaust pipe8also constitutes a magnetron antenna13together with a choke9, an antenna cover10, and an exhaust pipe support12. The magnetron antenna13is supported by a cylindrical insulator11.

The cathode filament1is connected to a center lead23and a side lead24, which are cathode leads. In addition, an upper end shield21, a lower end shield22, an input-side ceramic25, a cathode terminal26, and a spacer27are arranged around the cathode filament1. The spacer27has a function for preventing disconnection of the cathode filament1. The spacer27is fixed in a predetermined position by the sleeve28. These components constitute cathode parts. The vanes2are arranged around the cathode parts.

A choke coil31is connected to one end of a feedthrough capacitor32. The feedthrough capacitor32is attached to a filter case33of an input part. A cathode heating conductive wire35is provided at the other end of the feedthrough capacitor32, and is connected to a power supply via the cathode heating conductive wire.

The bottom portion of the filter case33is closed by a lid body34in terms of radio frequency. Cap-shaped upper and lower end sealing metals41and42and a metal gasket43are electrically connected to an upper yoke44.

The industrial magnetron100includes a cathode disposed at the center of an anode cylindrical body (anode) and a magnet. A heater is wound around the cathode, and when a predetermined current is applied thereto, thermal electrons are emitted from the cathode. The thermal electrons are attracted to the anode cylindrical body side, but circulate around the cathode while rotating due to the magnetic field formed by the magnet, and this vibration is caused to resonate in a cavity provided on the anode side, and the energy is extracted from an output part (antenna) as radio waves (microwaves).

The industrial magnetron100includes an anode cylindrical body3, annular permanent magnets4a,4barranged above and below the anode cylindrical body3to supply a magnetic field, and a cooling block200disposed in a columnar shape on the outer circumference of the anode cylindrical body3.

The present embodiment further improves the structure in which the refrigerant flow path210is provided in the cooling block200to directly cool the anode cylindrical body. In the present specification, “to directly cool” means cooling by causing a refrigerant to flow at a predetermined distance around the anode cylindrical body.

Cooling Block200

The cooling block200has an outer wall portion200aof the cooling block body, and an inner wall surface200bthat is in close contact with a side wall surface3aof the anode cylindrical body3in a cooling block center portion and that is in contact with outer wall surfaces40aand40bof the permanent magnets4aand4b.

Specifically, as shown inFIG.1B, the cooling block200has an anode cylindrical body contact portion200c, which is a portion in contact with the anode cylindrical body3, and a permanent magnet contact portion200d, which is a portion in contact with the permanent magnets4a,4b, and both the anode cylindrical body3and the permanent magnets4a,4bare both cooled by one cooling block.

The anode cylindrical body contact portion200cis a cylindrical portion of the inner wall surface200bof the cooling block200which is in close contact with the side wall surface3aof the anode cylindrical body3.

The permanent magnet contact portion200dis a portion of the inner wall surface200bof the cooling block200where both surfaces of corner portions A of the outer wall surfaces40aand40bof the permanent magnets4aand4bare in contact.

In the present embodiment, the anode cylindrical body contact portion200cand the permanent magnet contact portion200dare both formed on the inner wall surface200bof the cooling block200, but any cooling block200may be used as long as same has the anode cylindrical body contact portion200cin contact with the anode cylindrical body3and the permanent magnet contact portion200din contact with the permanent magnets4aand4b. For example, the anode cylindrical body contact portion200cmay cover at least part of the side wall surface3aof the anode cylindrical body3.

In the present embodiment, the permanent magnet contact portion200dis in contact with the corner portions A of the outer wall surfaces40aand40bof the permanent magnets4aand4b, that is, with the two surfaces of outer circumferential surfaces40a1and40b1of the ring-shaped permanent magnets4aand4band of opposing surfaces40a2and40b2of the permanent magnets4aand4bconnected to the outer circumferential surfaces40a1and40b1. As a result, the permanent magnet contact portion200dof the cooling block200comes into contact, via two surfaces, with the corner portions A of the outer wall surfaces40aand40bof the permanent magnets4aand4b, thus enabling the permanent magnets4aand4bto be effectively cooled. In this case, the permanent magnet contact portion200dmay be configured to contact one of the outer circumferential surfaces40a1and40b1or the opposing surfaces40a2and40b2. Further, the permanent magnet contact portion200dmay be configured to wrap the outer circumferential portions of the permanent magnets4aand4baround the other corners B facing the corner portions A of the outer circumferential surfaces40a1and40b1.

As described above, the cooling block200includes the anode cylindrical body contact portion200cand the permanent magnet contact portion200d, and the anode cylindrical body contact portion200cis brought into close contact with the side wall surface3aof the anode cylindrical body3, while the permanent magnet contact portion200dis brought into contact with the outer wall surfaces40a,40bof the permanent magnets4a,4b. The cooling block200is configured such that the anode cylindrical body3and permanent magnets4a,4bare simultaneously cooled by one cooling block by covering the anode cylindrical body3and the permanent magnets4a,4bwith the inner wall surface200b.

Note that the outer wall portion200aof the cooling block200may have a function as a yoke of the permanent magnets4aand4b.

In the cooling block200, the refrigerant flow path210through which the liquid refrigerant flows is disposed in the cooling block200in order to further increase the cooling capacity. That is, the cooling block200is provided with the refrigerant flow path210through which the liquid refrigerant flows so as to circulate around the anode cylindrical body3to directly cool the anode cylindrical body3.

The cooling block200has the refrigerant flow path210that makes at least one circuit of the anode cylindrical body3, and adjusts the capacity for cooling the anode cylindrical body3depending on the position in which the refrigerant flow path210circulates.

The anode cylindrical body contact portion200con the inner wall surface200b(inner circumferential surface side) of the cooling block200is disposed in close contact with the side wall surface3aof anode cylindrical body3. At this time, the permanent magnet contact portion200don the inner wall surface200b(permanent magnet side) of the cooling block200comes into contact with the outer wall surfaces40aand40bof the permanent magnets4aand4b. As a result, the cooling block200has a structure in which the anode cylindrical body3and the permanent magnets4a,4bare both cooled by one cooling block as the anode cylindrical body contact portion200cis brought into close contact with the side wall surface3aof the anode cylindrical body3and the permanent magnet contact portion200dis also brought into contact with outer wall surfaces40a,40bof the permanent magnets4a,4b.

The cooling block200is disposed on an outer circumferential portion of the anode cylindrical body3of the industrial magnetron100, and is formed in a columnar shape. Note that, in manufacturing and processing, a quadrangular column is adopted for the cooling block200.

The cooling block200is made of an aluminum material (Al) having high thermal conductivity and high workability. The refrigerant flow path210through which the refrigerant medium (refrigerant) flows is provided inside the cooling block200.

The cooling block200is fixed to the yoke6with a plurality of mounting screws46. Note that the cooling block200may be formed of a copper material (Cu) instead of the aluminum material.

As the refrigerant, normally water, particularly pure water or ion-exchanged water, is preferably used. The refrigerant may be a coolant (an aqueous solution containing ethylene glycol) or the like.

FIG.2is a perspective view illustrating a structure of the cooling block200.

As shown inFIG.2, the cooling block200has a quadrangular column shape, and includes an anode cylindrical body insertion portion201(space or through-hole) (FIG.3), a slit202(gap), and a protrusion203provided on both sides of the slit202. The anode cylindrical body3(FIG.1A) is inserted into the cooling block200from the anode cylindrical body insertion portion201(FIG.3), and an outer circumferential wall of the anode cylindrical body3is brought into close contact with an inner wall surface of the cooling block200. After the anode cylindrical body3(FIG.1A) is disposed in the cooling block200, both ends of the protrusion203are fixed by being screwed using a bolt280aand a nut280b. Note that the bolt280aand the nut280bconstitute fastening means280.

FIG.3is a perspective view showing a configuration of a cooling block200having a one-stage refrigerant flow path210that makes one circuit of the anode cylindrical body3.

As shown inFIG.3, the cooling block200is a quadrangular column-shaped aluminum material, and has an anode cylindrical body insertion portion201and a slit202(gap).

The protrusions203provided on both sides of the slit202are provided for tightening the bolt in order to bring the outer circumferential wall of the anode cylindrical body3into close contact with the cooling block200.

Note that the cooling block200may be a columnar body having another cross-sectional shape (for example, a circle), but is desirably a quadrangular column-shaped body because manufacturing which includes processing such as drilling is then straightforward.

In the following description, for the sake of convenience, the direction of the center axis of the columnar body, that is, the center axis of the anode cylindrical body insertion portion201, is referred to as the “vertical direction”. However, this is merely a convenient expression, and, depending on the method of installing the cooling block200, the center axis may be in the horizontal direction with respect to the direction of gravity or in the oblique direction relative to the vertical direction.

Refrigerant Flow Path210

Arrangement of Refrigerant Flow Path210

The refrigerant flow path210causes the liquid refrigerant to flow so as to circulate around the anode cylindrical body3to directly cool the anode cylindrical body3.

The refrigerant flow path210is disposed in a U-shape so as to circulate around the outer circumferential surface of the anode cylindrical body3inside a quadrangular column-shaped cooling block200.

One end of the refrigerant flow path210is an opening and is used as a connection port210afor connecting to a refrigerant storage tank (not illustrated) disposed outside, and the other end of the refrigerant flow path210is a connection port210band is used as a connection port210bfor connecting to the refrigerant storage tank. The connection port210aand the connection port210bare provided on the same side surface of the quadrangular column-shaped cooling block200. In operation, a supply path (not illustrated) for supplying the liquid refrigerant from a refrigerant storage tank or the like for supplying the liquid refrigerant is connected to an introduction port (the connection port210a), and a recovery path (not illustrated) for recovering the liquid refrigerant to the refrigerant storage tank or the like is connected to a discharge port (the connection port210b).

Arrangement Position of Refrigerant Flow Path that Makes Only One Circuit

It can be seen that, by disposing the refrigerant flow path210to circulate around the portion of the anode cylindrical body3having the largest amount of heat generation, the cooling capacity of the refrigerant flow path210relative to the anode cylindrical body3can be maximized.

FIGS.4A to4Dare diagrams schematically showing arrangement positions of a refrigerant flow path that makes one circuit.

InFIG.4A, a maximum heat generation part is distributed to the upper part of the anode cylindrical body3, and the refrigerant flow path210is made to circulate around the upper part of the anode cylindrical body3.

InFIG.4B, the maximum heat generation part is distributed to the central part of the anode cylindrical body3, and the refrigerant flow path210is made to circulate around the central part of the anode cylindrical body3.

InFIG.4C, the maximum heat generation part is distributed to the lower part of the anode cylindrical body3, and the refrigerant flow path210is made to circulate around the lower part of the anode cylindrical body3.

InFIG.4D, the maximum heat generation part is obliquely distributed to the anode cylindrical body3, and the refrigerant flow path210is made to circulate obliquely relative to the anode cylindrical body3.

As described above, the capacity for cooling the anode cylindrical body3can be adjusted by the position of the refrigerant flow path210circulating around the anode cylindrical body3.

Advantageous Effects of First Embodiment

As described above, the industrial magnetron100(FIG.1A) according to the first embodiment is the industrial magnetron100, which includes the anode cylindrical body3, the annular permanent magnets4aand4bthat are arranged above and below the anode cylindrical body3to supply a magnetic field, and the cooling block200disposed in a columnar shape on the outer circumference of the anode cylindrical body3. The cooling block200has the anode cylindrical body contact portion200c, which is a portion in contact with the anode cylindrical body3and the permanent magnet contact portion200d, which is a portion in contact with the permanent magnets4aand4b, and both the anode cylindrical body3and the permanent magnets4a,4bare cooled by one cooling block.

The magnetron disclosed in Patent Literature 1 includes a “cooling block which is fastened to the outer circumferential surface of the anode cylindrical body so as to surround the anode cylindrical body, and contains a cooling-liquid circulation path to cool the anode cylindrical body”. Thus, the cooling block is a structure for directly cooling only the anode cylinder. However, in the case of an industrial magnetron having a large output, it has been found that the cooling capacity afforded by only cooling the anode cylindrical body is insufficient relative to the temperature rise of the magnet.

Therefore, in the industrial magnetron100according to the present embodiment, the cooling block200covers at least some of the anode cylindrical body3and the permanent magnets4a,4b, and cools both the anode cylindrical body3and the permanent magnets4a,4b. Due to this configuration, in an industrial magnetron having a large output, even in a case where the heat generated by the anode cylindrical body3is transmitted to the permanent magnets4a,4band the temperature of the permanent magnets4a,4brises, the cooling block200is capable of simultaneously cooling the anode cylindrical body3and the permanent magnets4a,4bby one cooling block by bringing the anode cylindrical body contact portion200cof the inner wall surface200binto close contact with the side wall surface3aof the anode cylindrical body3and by bringing the permanent magnet contact portion200dinto contact with the outer wall surfaces40a,40bof the permanent magnets4a,4b. Accordingly, heat transfer from the anode cylindrical body3to the permanent magnets4a,4bis suppressed, and thus a temperature change is not generated in the permanent magnets4a,4b. Therefore, the anode cylindrical body3and the permanent magnets4a,4bcan be effectively cooled, and continuous operation can be performed while performance degradation and failure of the anode cylindrical body are suppressed. As a result, it is possible to provide an industrial magnetron in which the influence of heat generation is suppressed even when the industrial magnetron is operated in a high-output range of 2 kW to 15 kW.

In the industrial magnetron100(FIG.1A), the cooling block200has an inner wall surface200bin close contact with the side wall surface3aof the anode cylindrical body3. The anode cylindrical body contact portion200cof the inner wall surface200bis in close contact with the side wall surface3aof the anode cylindrical body3, and the permanent magnet contact portion200dis in contact with the outer wall surfaces40a,40bof the permanent magnets4a,4b.

Due to this configuration, the permanent magnets4aand4bare capable of dissipating the heat transferred from the anode cylindrical body3to the permanent magnet contact portion200dof the cooling block200and the main body of the cooling block200via the outer circumferential surfaces40a1and40b1and the opposing surfaces40a2and40bof the outer wall surfaces40aand40bof the permanent magnets4aand4b, thereby effectively cooling the anode cylindrical body3and the permanent magnets4aand4b.

Incidentally, the cooling block of the magnetron disclosed in Patent Literature 1 has a structure for cooling only the side wall surface of the anode cylindrical body, and thus does not have a structure in which the inner wall surface200b(permanent magnet side) of the cooling block200is in contact with the outer wall surfaces40aand40bof the permanent magnets4aand4bas per the cooling block200according to the present embodiment. Therefore, as per the present embodiment, the heat transferred from the anode cylindrical body3to the permanent magnets4aand4bis dissipated to the main body of the cooling block200through the outer circumferential surfaces40a1and40b1and the opposing surfaces40a2and40bof the outer wall surfaces40aand40bof the permanent magnets4aand4band the permanent magnet contact portion200dof the cooling block200, and therefore the specific advantageous effect of effectively cooling both the anode cylindrical body3and the permanent magnets4aand4bis not obtained.

In the industrial magnetron100(FIG.1A), the cooling block200includes a refrigerant flow path210that causes the liquid refrigerant to flow so as to circulate around the anode cylindrical body3to directly cool the anode cylindrical body3.

Due to this configuration, the cooling block200is capable of further increasing the cooling capacity by means of the refrigerant flow path210. Because the cooling capacity of the cooling block200is enhanced, the anode cylindrical body3and the permanent magnets4aand4bcan be more effectively cooled.

In the industrial magnetron100(FIG.1A), the cooling block200includes the refrigerant flow path210that circulates at least once around the anode cylindrical body3, and the capacity for cooling the anode cylindrical body3is adjusted by the position in which the refrigerant flow path210circulates.

In addition, at the stage of manufacturing a sample, which is the stage prior to main production of the industrial magnetron100, the industrial magnetron100is subjected to a test operation to specify a heat generation position of the anode cylindrical body3and measure the amount of heat generation thereof, and the arrangement position of the refrigerant flow path210and the number of circuits of the refrigerant flow path210are set according to the heat generation position and the amount of heat generation.

Thus, the capacity for cooling the anode cylindrical body3can be adjusted by the arrangement position of the refrigerant flow path which circulates around the anode cylindrical body3and the number of circuits of the refrigerant flow path210. That is, irrespective of the output of an industrial magnetron, at the stage of manufacturing a sample, which is the stage prior to main production of the industrial magnetron100, the industrial magnetron100is subjected to a test operation to specify the heat generation position of the anode cylindrical body3, measure the amount of heat generation, and the arrangement position of the refrigerant flow path210is set according to the heat generation position and the amount of heat generation thereof, and therefore the industrial magnetron100is capable of handling even changes in output, changes in application conditions or replacement (exchange) in the future, and thus versatility can be remarkably improved.

Second Embodiment

A configuration of a refrigerant flow path corresponding to a case where the cooling capacity afforded by one circuit is insufficient will be described.

FIG.5is a longitudinal sectional view showing a configuration of an industrial magnetron according to a second embodiment of the present invention. The present embodiment is an example in which the present invention is applied to an industrial magnetron that includes a refrigerant flow path that circulates a plurality of times around the anode cylindrical body. The same components as those inFIG.1Aare denoted by the same reference signs, and a description of duplicate parts is omitted.

The cooling block200A of the industrial magnetron100shown inFIG.5includes a refrigerant flow path210that circulates the anode cylindrical body3a plurality of times.

FIG.6is a perspective view showing a configuration of a cooling block200A having a refrigerant flow path210that circulates a plurality of times around the anode cylindrical body. The same components as those inFIG.2are denoted by the same reference signs, and a description of duplicate parts is omitted.

As illustrated inFIG.6, the cooling block200A contains two or more flow paths through which the refrigerant flows to different positions in the vertical direction. The different positions in the vertical direction have upper and lower positional relationships where an uppermost position is an upper position, the lowermost position is a lower position, and a position midway therebetween is an intermediate position.

The cooling block200A contains two or more refrigerant flow paths210through which the refrigerant is made to flow, in different positions in the vertical direction, and adjusts the capacity for cooling the anode cylindrical body3in accordance with the positions in which the refrigerant flow paths210are arranged and/or the number of circuits of the refrigerant flow paths210.

The cooling block200A includes the refrigerant flow paths210(upper flow paths210c,210d, and210e, intermediate flow paths (hereinafter, the flow paths are also referred to as “intermediate flow paths”)210g,210h, and210i, lower flow paths210k,210l, and210m, and connecting flow paths210fand210j), and there is a three-stage flow path arrangement of the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210m.

The cooling block200A contains the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210min different positions (heights) in the vertical direction.

The upper flow paths210c,210d, and210eand the intermediate flow paths210g,210h, and210iare connected by providing the connecting flow path210f, and the intermediate flow paths210g,210h, and210iand the lower flow paths210k,210l, and210mare connected by providing the connecting flow path210j. The connecting flow path210fis desirably arranged in the vertical direction such that the upper flow path210eand the intermediate flow path210gare connected at the shortest distance, that is, the connecting flow path210fis orthogonal to both the upper flow path and the intermediate flow path. Similarly, the connecting flow path210jis desirably arranged in the vertical direction such that the intermediate flow path210iand the lower flow path210kare at the shortest distance, that is, both the intermediate flow path and the lower flow path are orthogonal to each other. However, the orientations of the connecting flow paths210fand210jare not limited to the foregoing orientations, rather, the connecting flow paths210fand210jmay be arranged obliquely with respect to the vertical direction.

Therefore, in the cooling block200A, the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210mare connected in series by the connecting flow paths210fand210jto constitute one flow path.

The upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210mare formed in a U shape such that the center axes of the respective flow paths are located on the same horizontal plane. That is, the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210mare arranged in a U shape so as to circulate around the outer circumferential surface of the anode cylindrical body3(FIG.7), and the respective flow paths are arranged at predetermined intervals in the vertical direction. The upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210mare desirably arranged such that the respective U-shapes overlap when the cooling block200A is viewed from above.

The upper flow path210chas a connection port210awhich is an end (opening), and the lower flow path210mhas a connection port210bwhich is an end (opening). The connection port210aof the upper flow path210cand the connection port210bof the lower flow path210mare arranged on the same side surface side of the cooling block200A. The connection port210aof the upper flow path210cand the connection port210bof the lower flow path210mare used as connection ports for connection to a refrigerant storage tank (not shown) disposed outside.

As described above, in the configuration of the refrigerant flow path210that circulates a plurality of times, the capacity for cooling the anode cylindrical body3can be adjusted by the arrangement positions of the uppermost refrigerant flow paths (upper flow paths210c,210d,210e), the lowermost refrigerant flow paths (lower flow paths210k,210l,210m), and the intermediate refrigerant flow paths (intermediate flow paths210g,210h,210i), or the number of circuits of the intermediate refrigerant flow paths (the intermediate flow paths210g,210h,210i).

Processing and Formation of Refrigerant Flow Path210

FIG.7is a diagram showing processing and formation of the refrigerant flow path210.FIG.7exemplifies processing and formation of the lower flow paths210k,210l, and210mamong the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, the lower flow paths210k,210l, and210m, and the connecting flow paths210fand210jinFIG.6.

In the formation of the lower flow paths210k,210l, and210m, first, cutting by a drill is performed from one side surface of the cooling block200A (the lower flow path210m). At this time, cutting is performed so that the tip of the drill does not penetrate the side surface facing that side surface. Note that the interval between the lower flow paths210k,210l, and210mis appropriately set in consideration of the amount of heat generation of the anode cylindrical body3at the design stage.

Next, cutting is similarly performed in a predetermined position (the same height in the vertical direction) on a side surface (orthogonal side surface) adjacent to the corresponding side surface (the lower flow path210l). In this case, the cutting is performed such that the lower flow path210lis connected to the innermost portion of the lower flow path210m. At this point, the lower flow path210mand the lower flow path210lnear the inlet are connected.

Next, the lower flow path210kis cut so as to be connected to the deepest portion of the lower flow path210lnear the inlet. At this point, the lower flow path210land the lower flow path210knear the inlet are connected.

Through the above processing, the lower flow paths210k,210l, and210mcommunicate with each other, thus forming a U-shaped flow path.

Next, the connecting flow path210j(FIG.6) is formed by cutting using a drill from the lower bottom surface of the cooling block200A. As a result, the intermediate flow paths210g,210h, and210iand the lower flow paths210k,210l, and210mcommunicate with each other.

Here, helical groove processing has already been completed by cutting using a similar drill for the upper flow paths210c,210d, and210eand the intermediate flow paths210g,210h, and210i. Incidentally, helical refers to a winding like that of a snail, or a swirling line.

Note that the intervals between the upper flow paths210c,210d, and210e, the intermediate flow paths210g,210h, and210i, and the lower flow paths210k,210l, and210mare appropriately set in consideration of the amount of heat generation and the like of the anode cylindrical body3at the design stage.

Finally, termination processing is performed in which openings other than the connection port210bthrough which the refrigerant is introduced and the connection port (not illustrated) through which the refrigerant is recovered are closed by the closing members211and212. Note that a screw member for embedding the closing members211and212to appropriate positions is desirably used. Specifically, a sinking plug is desirably used as the closing members211and212, and by using a wound seal tape, liquid leakage can be prevented even in cases where the refrigerant pressure is high, and a highly reliable product can be obtained. By using the sinking plug, it is easy to remove the sinking plug and clean the inside of the flow path in a case where foreign matter or the like stagnates in the flow path of the cooling block200A and the flow path resistance increases. However, it is also conceivable to fix the closing members211and212by welding. This is because the welding can more reliably prevent liquid leakage.

Although the above-described processing and assembly method have been described in the case of a three-stage flow path configuration, the same applies to cases of a single-stage flow path configuration, a dual-stage flow path configuration, and also to cases of flow path configurations in four or more stages.

Flow of Refrigerant

FIG.8is a perspective view showing the flow of refrigerant in a cooling block having the three-stage flow path configuration ofFIG.6. A thick arrow inFIG.8indicates the flow of the refrigerant.

As shown inFIG.8, refrigerant introduced from a refrigerant storage tank (not shown) through a refrigerant supply path (not shown) and the connection port210a(introduction port) of the upper flow path210cis transferred to the intermediate flow paths210g,210h, and210iby the connecting flow path210fafter the anode cylindrical body3(FIG.5) inside the magnetron body is cooled by the upper flow paths210c,210d, and210e, and the anode cylindrical body3is cooled by the intermediate flow paths210g,210h, and210i, and is then transferred to the lower flow paths210k,210l, and210mby the connecting flow path210jsuch that the anode cylindrical body3is cooled by the lower flow paths210k,210l, and210m, whereupon processing to collect the refrigerant in the refrigerant storage tank is performed through the connection port210b(discharge port) of the lower flow path210mand the recovery flow path. This is defined as one cooling treatment, and this cooling treatment is repeated.

The refrigerant is introduced from the connection port210aof the upper flow path210c, passes through the U-shaped upper flow paths210c,210d, and210e, flows into the intermediate flow path210gvia the connecting flow path210f, passes through the U-shaped intermediate flow paths210g,210h, and210i, further flows into the lower flow path210kvia the connecting flow path210j, passes through the U-shaped lower flow paths210k,210l, and210m, and flows out from the connection port210bof the lower flow path210m.

InFIG.8, first, the refrigerant, which cools the anode cylindrical body3by being circulated by the upper flow paths210c,210d, and210eand is thermally affected by the anode cylindrical body3at such time, is transferred to the intermediate flow paths210g,210h, and210iand cools the anode cylindrical body3by being circulated by the intermediate flow paths210g,210h, and210iand is further thermally affected by the anode cylindrical body3at such time, cools the anode cylindrical body3by being circulated by the lower flow paths210k,210l, and210m; therefore, each cooling flow path can be made to circulate under a predetermined discharge pressure.

Adjustment of Refrigerant Capacity of Cooling Block200A that Includes Refrigerant Flow Paths Circulating a Plurality of Times

Basically, by disposing the refrigerant flow path210to circulate around the portion of the anode cylindrical body3having the largest amount of heat generation, the cooling capacity of the refrigerant flow path210relative to the anode cylindrical body3can be maximized.

The refrigerant capacity of the cooling block200A can be adjusted by any of, or a combination of:(1) the cross-sectional area of the refrigerant flow paths;(2) the arrangement positions of the refrigerant flow paths;(3) the number of circuits of the refrigerant flow paths.

In a case where the drill conditions are not changed, the refrigerant capacity can be adjusted by (2) the arrangement positions of the refrigerant flow paths and (3) the number of circuits of the refrigerant flow paths. Hereinafter, descriptions will be provided in order.

FIGS.9A to9Fare diagrams schematically illustrating arrangement positions of refrigerant flow paths circulating a plurality of times.

InFIG.9A, the maximum heat generation part is distributed to the upper part and the lower part of the anode cylindrical body3, and the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6) and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.6) circulate in the upper part and the lower part of the anode cylindrical body3. In this case, the flow paths have a dual-stage flow path configuration.

InFIG.9B, the maximum heat generation part is distributed to the central part of the anode cylindrical body3, and the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6) and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.6) are made to circulate in the central part of the anode cylindrical body3. In this case, the flow paths have a dual-stage flow path configuration.

InFIG.9C, the maximum heat generation part is distributed to the central part of the anode cylindrical body3, and is of the high-output type. The anode cylindrical body3has a three-stage flow path configuration corresponding to a heat generation amount of a high-output type, and the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.8), the intermediate refrigerant flow paths (for example, the intermediate flow paths210g,210h, and210iinFIG.8), and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.8) are made to circulate in the central part of the anode cylindrical body3.

InFIG.9D, the maximum heat generation part is distributed to the upper part of the anode cylindrical body3, and is of the high-output type. The anode cylindrical body3has a three-stage flow path configuration corresponding to a heat generation amount of a high-output type. The intermediate refrigerant flow paths (for example, the intermediate flow paths210g,210h, and210iinFIG.6) are arranged close to the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6), and the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6), the intermediate refrigerant flow paths (for example, the intermediate flow paths210g,210h, and210iinFIG.6), and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.6) circulate around the anode cylindrical body3.

FIG.9Eillustrates a three-stage flow path configuration corresponding to a heat generation amount of a high-output type. The difference fromFIG.9Cis that the intermediate flow paths210g,210h, and210iinFIG.9Ecirculate obliquely around the central part of the anode cylindrical body3. In the formation of the intermediate flow paths210g,210h, and210iinFIG.9E, cutting using a tapping drill is performed in an oblique direction from one side surface of the cooling block200A. Accordingly, the intermediate flow paths210g,210h, and210iinFIG.9Eare connected to each other while circulating around the anode cylindrical body3in a helical manner, between the uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6) and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.6). In addition, flow paths having an interior subjected to helical groove processing are connected to each other while circulating around the anode cylindrical body3in a helical manner.

By adopting a configuration in which the intermediate flow paths210g,210h, and210iare obliquely circulated, it is possible to cope with a heat generation amount of a high-output type without increasing the number of stages of the refrigerant flow paths.

FIG.9Fillustrates a four-stage flow path configuration corresponding to a heat generation amount of a high-output type. Intermediate refrigerant flow paths are provided in two stages, that is, an upper intermediate refrigerant flow path210oand a lower intermediate refrigerant flow path210p. The uppermost refrigerant flow paths (for example, the upper flow paths210c,210d, and210einFIG.6), the upper intermediate refrigerant flow path210o, the lower intermediate refrigerant flow path210p, and the lowermost refrigerant flow paths (for example, the lower flow paths210k,210l, and210minFIG.6) circulate around the anode cylindrical body3.

Advantageous Effects of Second Embodiment

In the industrial magnetron100(FIG.5) according to the second embodiment, the cooling block200A (FIG.6) contains two or more refrigerant flow paths210through which the refrigerant is made to flow, in different positions in a vertical direction, and the capacity for cooling the anode cylindrical body3is adjusted by the positions where the refrigerant flow paths210are arranged and/or the number of circuits of the refrigerant flow paths210.

In addition, similarly to the first embodiment, at the stage of manufacturing a sample, which is the stage prior to main production of the industrial magnetron100, the industrial magnetron100is subjected to a test operation to specify a heat generation position of the anode cylindrical body3and measure the amount of heat generation thereof, and the arrangement positions of the refrigerant flow paths210and the number of circuits of the refrigerant flow paths210are set according to the heat generation position and the amount of heat generation.

As described above, the cooling block200A includes two or more refrigerant flow paths210, thus enabling sufficient cooling of the anode cylindrical body3even when the heat generation amount of thereof increases, thereby suppressing performance degradation and failure of the anode cylindrical body3. As a result, it is possible to provide an industrial magnetron in which the influence of heat generation is suppressed even when the industrial magnetron is operated in a high-output range of 2 kW to 15 kW.

The cooling block200A is capable of handling the amount of heat generation while suppressing the number of stages of the refrigerant flow paths by devising the arrangement positions of the refrigerant flow paths210. In a case where the number of stages of the refrigerant flow paths is small, the configuration of the cooling block is simplified, and a reduction in manufacturing costs and maintenance can be expected.

Furthermore, irrespective of the output of an industrial magnetron, at the stage of manufacturing a sample, which is the stage prior to main production of the industrial magnetron100, the industrial magnetron100is subjected to a test operation to specify the heat generation position of the anode cylindrical body3, measure the amount of heat generation, and the arrangement positions of the refrigerant flow paths210and the number of circuits of the refrigerant flow paths210are set according to the heat generation position and the amount of heat generation thereof, and therefore the industrial magnetron100is capable of handling even changes in output, changes in application conditions or replacement (exchange) in the future, and thus versatility can be remarkably improved.

In the industrial magnetron100according to the second embodiment (FIG.5), the cooling block200A contains two or more refrigerant flow paths210through which the refrigerant is made to flow, in different positions in a vertical direction, and the two or more refrigerant flow paths210are connected to each other by connecting flow paths210f,210j, which each have a helical groove220on an inner wall surface thereof.

Thus, the two or more refrigerant flow paths210and the connecting flow paths210fand210jare both formed by cutting with a drill. Two or more refrigerant flow paths210are connected in series by the connecting flow paths210fand210j, and can constitute one flow path. Note that, from a manufacturing standpoint, the refrigerant flow paths and the connecting flow paths are desirably orthogonal to each other.

In the industrial magnetron100(FIG.5) according to the second embodiment, the cooling block200A has two or more refrigerant flow paths210through which the refrigerant is made to flow, in different positions in the vertical direction, and in a case where the uppermost refrigerant flow path in the vertical direction among the two or more refrigerant flow paths210is referred to as the upper flow path, and the lowermost refrigerant flow path in the vertical direction is referred to as the lower flow path, connection ports210a,210bare provided at one end of each of the upper flow path and the lower flow path, and the refrigerant is introduced from the connection port210aof the upper flow path and the refrigerant is discharged from the connection port210bof the lower flow path, or the refrigerant is introduced from the connection port210bof the lower flow path and the refrigerant is discharged from the connection port210aof the upper flow path.

Thus, the refrigerant supply path (not illustrated) and the refrigerant storage tank (not illustrated) can be connected to the connection ports210aand210b. For example, a refrigerant supplied from the refrigerant storage tank (not shown) via the refrigerant supply path (not shown) can be introduced into the connection port210a(introduction port). The refrigerant can be collected in the refrigerant storage tank through the connection port210b(discharge port) and the refrigerant collection flow path.

In the industrial magnetron100according to the second embodiment (FIG.5), the cooling block200A includes intermediate flow paths (for example, the intermediate flow paths210g,210h, and210iinFIG.8) arranged in an intermediate position in the vertical direction between the upper flow paths and the lower flow paths, and adjusts the capacity for cooling the anode cylindrical body3according to the positions where the intermediate flow paths are arranged and/or the number of intermediate flow paths installed.

Thus, by providing the intermediate flow paths, one set of flow paths including three or more stages of refrigerant flow paths can be configured (seeFIG.9C, for example). In addition, because the intermediate flow paths are provided, for example, as illustrated inFIGS.9C to9F, the degree of freedom due to the arrangement positions of the intermediate flow paths with respect to the heat generation part is increased. By making the intermediate flow paths correspond to the heat generation part, it is possible to handle the amount of heat generation while suppressing the number of stages of the refrigerant flow paths. As a result, even when the amount of heat generation of the anode cylindrical body3increases, the anode cylindrical body can be sufficiently cooled to suppress performance degradation and failure of the anode cylindrical body.

In the industrial magnetron100(FIG.5) according to the second embodiment, in a case where the intermediate flow path located in the upper part in the vertical direction is referred to as the upper intermediate flow path, and the intermediate flow path located in the lower part in the vertical direction is referred to as the lower intermediate flow path, the upper intermediate flow path and the lower intermediate flow path are arranged in displaced positions relative to each other so as not to be directly connected, and are connected by the connecting flow paths210fand210jafter circulating around the anode cylindrical body3.

Thus, the upper intermediate flow path and the lower intermediate flow path are arranged in displaced positions relative to each other so as not to be directly connected to each other, and thus, when the refrigerant, which has been thermally affected by the anode cylindrical body3, is transferred to the intermediate flow paths, the refrigerant can circulate all around the anode cylindrical body so as to cool same, thereby enhancing the cooling effect.

Furthermore, in the industrial magnetron100(FIG.5) according to the second embodiment, the intermediate flow path may be an oblique flow path connected between the upper flow path and the lower flow path while circulating around the anode cylindrical body3in a helical manner. Thus, for example, as illustrated inFIG.9E, the intermediate flow path can be made to correspond to the heat generation part, and it is possible to handle the amount of heat generation while suppressing the number of stages of the refrigerant flow paths.

In the industrial magnetron100according to the second embodiment (FIG.5), the columnar shape of the cooling block200A is a quadrangular column, the upper flow path, the lower flow path, and the intermediate flow path are formed in a U-shape from a predetermined surface of the quadrangular column to circulate around the anode cylindrical body3, and the upper flow path and the lower flow path are each closed at different ends from those of the connection ports210a,210b, and both ends of the intermediate flow path are closed.

Thus, because the columnar shape of the cooling block is a quadrangular column, manufacturing including processing such as drilling is straightforward. The quadrangular column has high affinity in a case where the refrigerant flow paths are formed in a U-shape. Furthermore, the U-shaped refrigerant flow path is also easily subjected to helical groove processing by cutting using a tapping drill. In light of the foregoing configurations, manufacturing costs can be reduced.

Third Embodiment

FIG.10is a perspective view showing a structure of cooling block200B of the industrial magnetron according to a third embodiment of the present invention. The same components as those inFIG.2are denoted by the same reference signs, and a description of duplicate parts is omitted.

The cooling block200B of the industrial magnetron100shown inFIG.10includes a refrigerant flow path210that that makes one circuit of the anode cylindrical body3.

The refrigerant flow path210of the cooling block200B is a cylindrical flow path having the helical groove220on the inner wall surface thereof.

The industrial magnetron100has a large output and a large amount of heat generation from the anode cylindrical body, and hence it is necessary to enhance the cooling effect afforded by the cooling block200. In order to enhance a cooling effect, the helical groove220is provided on the inner wall surface of the refrigerant flow paths210.

The refrigerant flow paths210having the helical groove220have two advantages that the refrigerant contact surface area serving as a refrigerant supply path is larger than that of a refrigerant flow path having no helical groove, and that a stagnation time of the refrigerant is longer. Therefore, the refrigerant flow path210having the helical groove220enables the cooling capacity to be increased even if the supply amount of the refrigerant per unit time is the same.

Note that, hereinafter, the refrigerant flow path210having the helical groove220on the inner wall surface thereof is simply referred to as a refrigerant flow path, and a refrigerant flow path having no helical groove on the inner wall surface thereof is referred to as a conventional refrigerant flow path.

FIG.11is a diagram illustrating a structure of a refrigerant flow path210having a helical groove220on an inner wall surface thereof.

As illustrated inFIG.11, the helical groove220includes a predetermined pitch, an inner diameter, and a nominal diameter. The pitch, the inner diameter, and the size of the nominal diameter of the helical groove are set at the stage of manufacturing a sample, which is the stage prior to main production of the industrial magnetron100, by subjecting the industrial magnetron100to a test operation to specify the heat generation position of the anode cylindrical body3and measure the amount of heat generation thereof, according to the heat generation position and the amount of heat generation.

A refrigerant flow path210having a helical groove220illustrated inFIG.11is disposed in the cooling block200B (FIG.10).

For the helical groove220, in manufacturing and processing, the refrigerant flow path210is cut using a drill to form a cylindrical hole, and helical groove processing is further performed using a tapping drill (a helical groove processing drill). Alternatively, the helical groove may be opened directly using a tapping drill.

FIGS.12A and12Bare diagrams to illustrate the flow of a liquid medium in a refrigerant flow path.FIG.12Aillustrates the flow of the liquid medium in the refrigerant flow path210, andFIG.12Billustrates the flow of the liquid medium in a conventional refrigerant flow path.

As shown inFIG.12A, in the case of the refrigerant flow path210, the liquid medium flows linearly (arrow a inFIG.12A) and flows while helically rotating (swirling) (arrow b inFIG.12A).

On the other hand, as shown inFIG.12B, in the case of the conventional refrigerant flow path, the liquid medium flows linearly (arrow a inFIG.12B).

As described above, in the refrigerant flow path210according to the present embodiment, the liquid medium is subjected to a circulating movement while swirling along the helical groove220. Because the liquid medium flows while swirling along the helical groove220, the stagnation time of the refrigerant becomes long, and the cooling capacity can be increased even if the supply amount of the refrigerant per unit time is the same.

Comparison Between Refrigerant Flow Path210and Conventional Refrigerant Flow Path

In a conventional refrigerant flow path, in a case where drill cutting is performed, the refrigerant flow path has a circular cross-section, and the effect is small from the viewpoint of the heat transfer surface area.

In contrast, the refrigerant flow path210has a circular cross-section as per the conventional refrigerant flow path, but the helical groove220enables an increase in the refrigerant contact surface area. In other words, the refrigerant contact surface area can be increased without increasing the cross-sectional area of the refrigerant flow path. In addition, because the supplied refrigerant flows while swirling along the helical groove220, the stagnation time of the refrigerant becomes long. As a result, the cooling capacity of the refrigerant flow path210can be increased even if the supply amount of the refrigerant per unit time is the same.

As another method for enhancing the cooling effect afforded by the cooling block200B, it is conceivable to further increase the cross-sectional area of the refrigerant flow path to increase the refrigerant flow rate per unit time, and to increase the number of refrigerant flow paths in the flow path having the same cross-sectional area to increase the heat transfer surface area as per the second embodiment.

As described above, in the present embodiment, because the refrigerant contact surface area can be increased by the helical groove220, the refrigerant flow rate per unit time can be further increased even if the cross-sectional area is the same as that of the conventional refrigerant flow path. That is, an effect similar to that obtained by increasing the cross-sectional area of the refrigerant flow path can be obtained without increasing the cross-sectional area of the refrigerant flow path.

In addition, because the heat transfer surface area can be increased by enlarging the refrigerant contact surface, the number of refrigerant flow paths is not increased, or fewer refrigerant flow paths can be used.

In a case where the number of refrigerant flow paths is increased, the refrigerant flow rate per unit time per flow path does not change, but the heat transfer surface area increases in proportion to the number of flow paths. Furthermore, the surface area directly facing the refrigerant flowing in a position close to the anode cylindrical body3is increased, and hence the cooling effect can be enhanced.

Advantageous Effects of Third Embodiment

The cooling block200B of the industrial magnetron100according to the third embodiment includes a refrigerant flow path210having the helical groove220on the inner wall surface thereof.

This configuration is advantageous in that the refrigerant flow paths210having the helical groove220have a larger refrigerant contact surface area serving as a refrigerant supply path and a longer refrigerant stagnation time than a conventional refrigerant flow path having no helical groove. For this reason, even if the supply amount of the refrigerant per unit time is the same, the cooling capacity can be increased. Therefore, even when the amount of heat generation of the anode cylindrical body3increases, the anode cylindrical body can be sufficiently cooled to suppress performance degradation and failure of the anode cylindrical body. As a result, it is possible to provide an industrial magnetron in which the influence of heat generation is suppressed even when the industrial magnetron is operated in a high-output range of 2 kW to 15 kW.

Note that the present invention is not limited to the configurations described in the above embodiments, and the configurations can be appropriately changed without departing from the gist of the present invention set forth in the claims.

For example, the arrangement positions, the number of stages, and the shape of the refrigerant flow paths and the position of the connection port, and so forth are merely examples, and any configuration may be applied.

The above-described embodiments have been described in detail to facilitate understanding of the present invention, and are not necessarily limited to those having all the described configurations. Further, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can also be added to the configuration of the one embodiment. Moreover, it is possible to add, eliminate, or substitute other configurations for part of the configuration of each embodiment.

REFERENCE SIGNS LIST

1cathode filament2anode vane3anode cylindrical body3aside wall surface of anode cylindrical body4a,4bpermanent magnet5a,5bmagnetic pole6yoke7antenna lead8exhaust pipe9choke portion10antenna cover40a,40bouter wall surface of permanent magnet40a1,40b1outer circumferential surface where permanent magnet is in contact with permanent magnet contact portion of cooling block40a2,40b2opposing surface where permanent magnet is in contact with permanent magnet contact portion of cooling block100industrial magnetron200,200A,200B cooling block200aouter wall portion of cooling block200binner wall surface of cooling block200canode cylindrical body contact portion of cooling block200dpermanent magnet contact portion of cooling block201anode cylindrical body insertion portion202slit210refrigerant flow path210c,210d,210eupper flow path210g,210h,210i,210o,210pintermediate flow path210c,210d,210elower flow path210f,210jconnecting flow path210a,210bconnection port211,212closing member