6kW / 2460MHz packaged continuous wave magnetron core and preparation method thereof

Abstract

A 6kW / 2460MHz packaged continuous wave magnetron core and a preparation method thereof, specifically relating to the technical field of packaged continuous wave magnetrons, comprising a lead assembly, a cavity assembly and an output end assembly which are welded and fixed in sequence from top to bottom, wherein the lead assembly comprises a wiring piece, a lead porcelain, a cathode valve ring, an upper pole shoe joint, an upper pole shoe, a shielding cap I, a cathode wire, a shielding cap II, a cathode branch I and a cathode branch II; the cavity assembly comprises a cavity, a partition belt, a water jacket, a water pipe joint and an output wire; the output end assembly comprises a lower pole shoe, a lower pole shoe joint, an output window, an exhaust pipe joint and an exhaust pipe which are welded and fixed in sequence from top to bottom; and the core is prepared through welding, carbonization, exhaust, aging and sealing processes, adopts a modular structure design as a whole, is convenient for assembly and welding, has high processing efficiency, is easy for mass production, has a long continuous service life, and meets the requirements of long-term continuous operation of small-volume and high-power microwave heating equipment.

Description

Technical Field

[0001] The invention relates to a magnetron, and in particular to a 6kW / 2460MHz packaged continuous wave magnetron core and a preparation method thereof. Background Art

[0002] A magnetron is an electric vacuum device used to generate microwave energy. Traditional magnetrons are unpackaged continuous wave magnetrons, which require the use of large devices such as electromagnets, which have an adverse effect on the miniaturization of microwave sources and limit the application scope of the product.

[0003] In order to adapt to the miniaturization of microwave sources and expand the application range of products, the application of packaged continuous wave magnetrons in microwave sources is increasing. Traditional packaged continuous wave magnetrons are mainly 6kW / 2450MHz series, with complex structures and short continuous service life.

[0004] Chinese patent CN105097389A discloses a continuous wave magnetron with a low appearance quality factor in the 2450MHz frequency band, including a cavity assembly, an output window assembly, a lead assembly and a heat sink, wherein the cavity assembly is composed of the following parts: a cylindrical cavity; a plurality of cavity fins located in the cylindrical cavity and distributed in a petal shape, wherein the water channel structure of the cavity fins constitutes a V-shaped water channel cooling structure; a water cooling jacket arranged on the outer periphery of the cylindrical cavity, wherein a water-isolating ring with holes is arranged in the water cooling jacket around the cylindrical cavity; and water-isolating rings arranged at both ends of the cylindrical cavity, Large and small partition belts are used to increase the mode division degree, and the large partition belt is located at the periphery of the small partition belt and has a gap; a water pipe inserted into the water cooling jacket and used for cooling water injection and discharge; and an output antenna connected to the cavity wing; the output window assembly is connected to one end of the cavity assembly and forms a sealing structure, and the other end of the output antenna is located inside the output window assembly and does not touch the inner wall of the output window assembly; the other end of the cavity assembly is welded to the lead assembly, and the radiator is welded at a position on the lead assembly away from the cavity assembly. This packaged continuous wave magnetron still has a complex structure, is difficult to assemble and weld, and has low processing efficiency. Although the continuous service life is extended, it only lasts for 2000 hours, which cannot meet the needs of long-term continuous operation of small-volume and high-power microwave heating equipment. Summary of the invention

[0005] The present invention aims to solve the above-mentioned technical problems and provides a 6kW / 2460MHz packaged continuous wave magnetron core and a preparation method thereof, which adopts a modular structure design, is convenient for assembly and welding, has high processing efficiency, is easy for mass production, and has a long continuous service life, thus meeting the needs of long-term continuous operation of small-volume, high-power microwave heating equipment.

[0006] The technical solution of the present invention is:

[0007] A 6kW / 2460MHz packaged continuous wave magnetron tube core, comprising a lead assembly, a cavity assembly and an output end assembly which are welded and fixed in sequence from top to bottom, wherein the lead assembly comprises a wiring piece, a lead porcelain, a cathode valve ring, an upper pole shoe joint, an upper pole shoe, a shielding cap I, a cathode wire, a shielding cap II, a cathode branch I and a cathode branch II; the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint, the upper pole shoe, the shielding cap I, the cathode wire and the shielding cap II are welded and fixed in sequence from top to bottom, the cathode branch I passes through the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint and the upper pole shoe from top to bottom and is welded and fixed to the wiring piece and the shielding cap I, the cathode branch II passes through the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint, the upper pole shoe, the shielding cap I and the cathode wire from top to bottom and is welded and fixed to the wiring piece and the shielding cap II;

[0008] The cavity assembly includes a cavity, a partition belt, a water jacket, a water pipe joint and an output line; a plurality of circumferentially distributed fan-shaped grooves are respectively provided on the upper and lower end surfaces of the cavity, the partition belt is installed in the corresponding fan-shaped grooves, the partition belt is welded and fixed at the head and tail, the water jacket is coaxially welded and fixed on the outer circumferential surface of the cavity, there are two water pipe joints, the two water pipe joints are welded and fixed on the water jacket and communicated with the inside of the water jacket, and the output line is welded and fixed at the lower end of the cavity;

[0009] The output end assembly includes a lower pole shoe, a lower pole shoe joint, an output window, an exhaust pipe joint and an exhaust pipe which are welded and fixed in sequence from top to bottom; the upper pole shoe is welded and fixed to the upper end of the cavity, and the lower pole shoe is welded and fixed to the lower end of the cavity.

[0010] Furthermore, a partition is provided on the outer circular surface of the cavity, and a flow hole is provided on the partition. The partition divides the water jacket into two upper and lower water channels. The two water pipe joints are connected to the corresponding water channels, and the flow hole is radially opposite to the two water pipe joints, thereby extending the cooling path of the cooling water and improving the cooling effect.

[0011] Furthermore, notches are respectively arranged between two adjacent fan-shaped grooves on the upper and lower end surfaces of the cavity, and the welding points between the partition-shaped belts are located in the corresponding notches.

[0012] Furthermore, the cathode branch I and the shielding cap I are welded by argon arc welding.

[0013] Furthermore, the terminal piece, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe, cathode branch II and the welded cathode branch I and shielding cap I are welded by a brazing furnace using pure silver solder.

[0014] Furthermore, the cathode wire, shielding cap II and the welded terminal piece, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe, cathode branch II, cathode branch I, and shielding cap I are welded by argon arc welding.

[0015] Furthermore, the cavity, the isolating belt, the water jacket, the water pipe joint and the output line assembly are welded by a brazing furnace using silver-copper solder.

[0016] Furthermore, the lower pole shoe, the lower pole shoe joint, the output window, the exhaust pipe joint and the exhaust pipe are welded by a brazing furnace using silver-copper solder.

[0017] Furthermore, the lead assembly, the cavity assembly and the output end assembly are welded by a vacuum furnace using silver-copper solder.

[0018] The method for preparing the 6kW / 2460MHz packaged continuous wave magnetron core comprises the following steps:

[0019] 1) Connect the cathode branch I and the shielding cap I, and weld the joint by argon arc welding;

[0020] 2) Connect the lug, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe and shielding cap I in turn, connect the cathode branch I and the lug, and weld the joints through a brazing furnace;

[0021] 3) Connect the cathode wire to the shielding cap and shielding cap II respectively, connect the cathode branch II to the wiring piece and shielding cap II respectively, and weld the connecting part by argon arc welding under gas protection to form a lead assembly;

[0022] 4) Carbonizing the lead assembly;

[0023] 5) Install the partition belts circumferentially on the upper and lower end surfaces of the cavity, butt the two adjacent partition belts, put the water jacket on the outer circumference of the cavity, insert the water pipe joint on the outer circumference of the water jacket, insert the output line on the lower end surface of the cavity, and use silver-copper solder to weld the joints through a brazing furnace to form a cavity assembly;

[0024] 6) Connect the lower pole shoe, the lower pole shoe joint, the output window, the exhaust pipe joint and the exhaust pipe in sequence, and use silver-copper solder to weld the joints through a brazing furnace to form an output end assembly;

[0025] 7) Connect the lead assembly, cavity assembly and output end assembly in turn, keep the output end assembly vertically upward, and use silver-copper solder to weld the joints in a vacuum furnace;

[0026] 8) Connect the terminal piece to the cathode power supply of the double vacuum exhaust table, connect the exhaust pipe to the exhaust port of the double vacuum exhaust table and exhaust, and keep the process vacuum degree P≤5×10 -5 Pa;

[0027] 9) Raise the temperature of the double vacuum exhaust oven to 500-580℃ and start heat preservation. Keep the temperature for 7.5-8.5 hours and then turn off the power to cool down.

[0028] 10) When the oven temperature drops to 180℃-220℃, cathode aging is performed:

[0029] 11) When the oven temperature drops to 50℃-100℃, secondary cathode aging is carried out:

[0030] 12) Seal the exhaust pipe.

[0031] The beneficial effects of the present invention are:

[0032] 1. Since the lead assembly, cavity assembly and output end assembly adopt modular structure design, they are easy to assemble and weld, with high yield rate, high processing efficiency and easy mass production.

[0033] 2. Since a plurality of circumferentially distributed fan-shaped grooves are provided on the upper and lower end surfaces of the cavity, the partition belt is installed in the corresponding fan-shaped groove, and the partition belt is welded and fixed at the head and tail, and the output efficiency reaches more than 74%. Therefore, at the same voltage and current, the output power can reach 6.25kW, the center frequency error is 2460MHz±5MHz, and the frequency consistency is good.

[0034] 3. Since the lead assembly, cavity assembly and output end assembly adopt modular welding technology, the overall closed structure can shield the leaked microwaves, there is no sparking during use, the continuous service life exceeds 5000h, and the working performance is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the present invention;

[0036] Figure 2 yes Figure 1 A schematic diagram of the structure of the middle lead assembly;

[0037] Figure 3 yes Figure 1 A schematic diagram of the structure of the middle cavity assembly;

[0038] Figure 4 yes Figure 3 Schematic diagram of the structure of the middle cavity;

[0039] Figure 5 yes Figure 4 A top view of

[0040] Figure 6 yes Figure 4 Middle AA section view;

[0041] Figure 7 yes Figure 1 A schematic diagram of the structure of the output terminal component;

[0042] In the figure: 1-lead assembly, 2-cavity assembly, 3-output end assembly, 101-wiring piece, 102-lead porcelain, 103-cathode valve ring, 104-upper pole shoe connector, 105-upper pole shoe, 106-shielding cap I, 107-cathode wire, 108-shielding cap II, 109-cathode branch I, 110-cathode branch II, 201-cavity, 202-partition belt, 203-water jacket, 204-water pipe connector, 205-output line, 206-fan-shaped groove, 207-notch, 208-partition, 209-circulation hole, 301-lower pole shoe, 302-lower pole shoe connector, 303-output window, 304-exhaust pipe connector, 305-exhaust pipe. DETAILED DESCRIPTION

[0043] like Figure 1-Figure 7 As shown, a 6kW / 2460MHz packaged continuous wave magnetron core comprises a lead assembly 1, a cavity assembly 2 and an output end assembly 3 which are welded and fixed in sequence from top to bottom, wherein the lead assembly 1 comprises a wiring piece 101, a lead porcelain 102, a cathode valve ring 103, an upper pole shoe connector 104, an upper pole shoe 105, a shielding cap I106, a cathode wire 107, a shielding cap II108, a cathode branch I109 and a cathode branch II110; the wiring piece 101, the lead porcelain 102, the cathode valve ring 103, the upper pole shoe connector 104, the upper pole shoe 105, the shielding cap II108, the cathode branch I109 and the cathode branch II110; Cap I106, cathode wire 107 and shielding cap II108 are welded and fixed in sequence up and down, the cathode branch I109 passes through the wiring piece 101, lead porcelain 102, cathode valve ring 103, upper pole shoe connector 104 and upper pole shoe 105 up and down and is welded and fixed with the wiring piece 101 and shielding cap I106, the cathode branch II110 passes through the wiring piece 101, lead porcelain 102, cathode valve ring 103, upper pole shoe connector 104, upper pole shoe 105, shielding cap I106 and cathode wire 107 up and down and is welded and fixed with the wiring piece 101 and shielding cap II108.

[0044] The cavity assembly 2 includes a cavity 201, a partition belt 202, a water jacket 203, a water pipe joint 204 and an output line 205; a plurality of circumferentially distributed fan-shaped grooves 206 are respectively provided on the upper and lower end surfaces of the cavity 201, and a notch 207 is respectively provided between two adjacent fan-shaped grooves 206 on the upper and lower end surfaces of the cavity 201, and the partition belt 202 is installed in the corresponding fan-shaped groove 206, and the partition belt 202 is welded and fixed at the head and tail, and the welding points between the partition belts 202 are located at the corresponding In the notch 207, the water jacket 203 is coaxially welded and fixed on the outer circumferential surface of the cavity 201. A partition 208 is provided on the outer circumferential surface of the cavity 201. A flow hole 209 is provided on the partition 208. The partition 208 divides the water jacket into two upper and lower water channels. There are two water pipe joints 204, and the two water pipe joints 204 are connected to the corresponding water channels. The flow hole 209 is radially opposite to the two water pipe joints 204. The output line 205 is welded and fixed to the lower end of the cavity 201.

[0045] The output end assembly 3 includes a lower pole shoe 301, a lower pole shoe joint 302, an output window 303, an exhaust pipe joint 304 and an exhaust pipe 305 which are welded and fixed in sequence from top to bottom; the upper pole shoe 105 is welded and fixed to the upper end of the cavity 201, and the lower pole shoe 301 is welded and fixed to the lower end of the cavity 201.

[0046] The method for preparing the 6kW / 2460MHz packaged continuous wave magnetron core comprises the following steps:

[0047] 1) Connect the cathode branch I109 and the shielding cap I106, and weld the joint by argon arc welding;

[0048] 2) Connect the lug 101, lead porcelain 102, cathode valve ring 103, upper pole shoe connector 104, upper pole shoe 105 and shielding cap I106 in sequence, connect the cathode branch I109 and lug 101, and weld the joints by brazing furnace;

[0049] 3) Connect the cathode wire 107 to the shielding cap I106 and the shielding cap II108 respectively, and connect the cathode branch II110 to the wiring piece 101 and the shielding cap II108 respectively, and weld the connecting parts by argon arc welding under gas protection to form the lead assembly 1;

[0050] 4) Carbonizing the lead assembly;

[0051] 5) Install the spacer belt 202 circumferentially on the upper and lower end surfaces of the cavity 201, butt the two adjacent spacer belts 202, sleeve the water jacket 203 on the outer circumference of the cavity 201, insert the water pipe joint 204 on the outer circumference of the water jacket 203, insert the output line 205 on the lower end surface of the cavity 201, and use silver-copper solder to weld the joints through a brazing furnace to form a cavity assembly 2;

[0052] 6) Connect the lower pole shoe 301, the lower pole shoe joint 302, the output window 303, the exhaust pipe joint 304 and the exhaust pipe 305 in sequence, and use silver-copper solder to weld the joints through a brazing furnace to form an output end assembly 3;

[0053] 7) Connect the lead assembly 1, the cavity assembly 2 and the output end assembly 3 in turn, keep the output end assembly 3 vertically upward, and use silver-copper solder to weld the joints in a vacuum furnace;

[0054] 8) Connect the terminal piece 101 to the cathode power supply of the double vacuum exhaust table, connect the exhaust pipe 305 to the exhaust port of the double vacuum exhaust table and exhaust, and keep the process vacuum degree P = 5×10 -5 Pa;

[0055] 9) Raise the temperature of the double vacuum exhaust oven to 540℃ and start heat preservation. After 8 hours of heat preservation, turn off the power and cool down.

[0056] 10) When the oven temperature drops to 200℃, cathode aging is performed:

[0057] parameter unit first step Step 2 Filament current A 15 20 Duration min 120 120

[0058] 11) When the oven temperature drops to 80°C, secondary cathode aging is performed:

[0059] parameter unit first step Step 2 Step 3 Step 4 Step 5 Step 6 Filament current A 24 28 32 36 42 36 Duration min 30 30 30 5 1 5

[0060] 12) The exhaust pipe 305 is sealed.

[0061] Product performance test results: output power reaches 6.25kW, frequency reaches 2460MHz±5MHz, frequency consistency is good, and continuous service life reaches 5000h.

[0062] The above are only specific embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A 6kW / 2460MHz packaged continuous wave magnetron core, comprising a lead assembly, a cavity assembly and an output end assembly which are welded and fixed in sequence from top to bottom, characterized in that: The lead assembly includes a wiring piece, a lead porcelain, a cathode valve ring, an upper pole shoe joint, an upper pole shoe, a shielding cap I, a cathode wire, a shielding cap II, a cathode branch I and a cathode branch II; the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint, the upper pole shoe, the shielding cap I, the cathode wire and the shielding cap II are welded and fixed in sequence up and down, the cathode branch I passes through the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint and the upper pole shoe up and down and is welded and fixed with the wiring piece and the shielding cap I, the cathode branch II passes through the wiring piece, the lead porcelain, the cathode valve ring, the upper pole shoe joint, the upper pole shoe, the shielding cap I and the cathode wire up and down and is welded and fixed with the wiring piece and the shielding cap II; The cavity assembly comprises a cavity, a partition belt, a water jacket, a water pipe joint and an output line; a plurality of circumferentially distributed fan-shaped grooves are respectively provided on the upper and lower end surfaces of the cavity, the partition belt is installed in the corresponding fan-shaped grooves, the partition belt is welded and fixed at the head and tail, the water jacket is coaxially welded and fixed on the outer circular surface of the cavity, a partition is provided on the outer circular surface of the cavity, a flow hole is provided on the partition, the partition divides the water jacket into two upper and lower water channels, there are two water pipe joints, the two water pipe joints are welded and fixed on the water jacket and communicate with the corresponding water channels in the water jacket, and the flow hole is radially opposite to the two water pipe joints, and the output line is welded and fixed at the lower end of the cavity; The output end assembly includes a lower pole shoe, a lower pole shoe joint, an output window, an exhaust pipe joint and an exhaust pipe which are welded and fixed in sequence from top to bottom; the upper pole shoe is welded and fixed to the upper end of the cavity, and the lower pole shoe is welded and fixed to the lower end of the cavity.

2. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: Notches are respectively arranged between two adjacent fan-shaped grooves on the upper and lower end surfaces of the cavity, and the welding points between the partition-shaped belts are located in the corresponding notches.

3. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The cathode branch 1 and the shielding cap 1 are welded by argon arc welding.

4. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The wiring piece, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe, cathode branch II and the welded cathode branch I and shielding cap I are welded by a brazing furnace using pure silver solder.

5. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The cathode wire, shielding cap II and the welded wiring piece, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe, cathode branch II, cathode branch I and shielding cap I are welded by argon arc welding.

6. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The cavity, the partition belt, the water jacket, the water pipe joint and the output line assembly are welded by a brazing furnace using silver-copper solder.

7. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The lower pole shoe, the lower pole shoe joint, the output window, the exhaust pipe joint and the exhaust pipe are welded by a brazing furnace using silver-copper solder.

8. The 6kW / 2460MHz packaged continuous wave magnetron core according to claim 1, characterized in that: The lead assembly, the cavity assembly and the output end assembly are welded by a vacuum furnace using silver-copper solder.

9. A method for preparing a 6kW / 2460MHz packaged continuous wave magnetron core, characterized in that: The following steps are involved: 1) Connect the cathode branch I and the shielding cap I, and weld the joint by argon arc welding; 2) Connect the lug, lead porcelain, cathode valve ring, upper pole shoe joint, upper pole shoe and shielding cap I in turn, connect the cathode branch I and the lug, and weld the joints through a brazing furnace; 3) Connect the cathode wire to the shielding cap I and shielding cap II respectively, and connect the cathode branch II to the wiring piece and shielding cap II respectively. The connecting part is welded by argon arc welding under gas protection to form a lead assembly; 4) Carbonizing the lead assembly; 5) Install the partition belts circumferentially on the upper and lower end surfaces of the cavity, butt the two adjacent partition belts, put the water jacket on the outer cylindrical surface of the cavity, insert the water pipe joint on the outer cylindrical surface of the water jacket, insert the output line on the lower end surface of the cavity, and use silver-copper solder to weld the joints through a brazing furnace to form a cavity assembly; 6) Connect the lower pole shoe, the lower pole shoe joint, the output window, the exhaust pipe joint and the exhaust pipe in sequence, and use silver-copper solder to weld the joints through a brazing furnace to form an output end assembly; 7) Connect the lead assembly, cavity assembly and output end assembly in turn, keep the output end assembly vertically upward, and use silver-copper solder to weld the joints in a vacuum furnace; 8) Connect the terminal piece to the cathode power supply of the double vacuum exhaust table, connect the exhaust pipe to the exhaust port of the double vacuum exhaust table and exhaust, and keep the process vacuum degree P≤5×10 -5 Pa; 9) Raise the temperature of the double vacuum exhaust oven to 500-580℃ and start heat preservation. Keep the temperature for 7.5-8.5 hours and then turn off the power to cool down. 10) When the oven temperature drops to 180℃-220℃, cathode aging is performed; 11) When the oven temperature drops to 50℃-100℃, secondary cathode aging is carried out; 12) Seal the exhaust pipe.

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