A 403MHz ultra-high power magnetron lead-out transmission system

Abstract

The invention discloses a 403MHz ultra-high power magnetron extraction transmission system, which belongs to the field of magnetron technology, and comprises a ceramic component and an excitation cavity with an excitation cavity therein; the ceramic component comprises a first ring body, a second ring body and an inner sleeve, the first ring body is fixedly arranged at the end of the antenna sleeve, a ceramic sheet is transversely arranged in the inner sleeve, the ceramic sheet divides the chamber surrounded by the first ring body, the second ring body and the inner sleeve into chamber a and chamber b, a conductor core is inserted through the ceramic sheet and its two ends are respectively extended into chamber a and chamber b; a connection port is arranged in the excitation cavity, an antenna rod a is arranged in the antenna sleeve, an antenna rod b is arranged in the excitation cavity, the antenna rod a is connected to the antenna rod b through the conductor core, a hollow adjustment rod is fixed in the excitation cavity, a socket is arranged in the adjustment rod, and the end of the antenna rod b is inserted into the antenna seat socket. The invention discloses a 403MHz ultra-high power magnetron extraction transmission system with high microwave extraction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetrons, and in particular relates to a 403MHz ultra-high power magnetron lead-out transmission system. Background Art

[0002] The design of magnetron antenna and excitation cavity on the market is not efficient in power coupling output, and the power transmission system is often not given much attention, which seriously restricts the service life of the magnetron. In addition, the commonly used structure has low working efficiency and serious energy waste. Summary of the invention

[0003] The purpose of the present invention is to provide a 403MHz ultra-high power magnetron extraction transmission system with high microwave extraction efficiency.

[0004] To achieve the above object, the present invention adopts the following technical scheme: a 403MHz ultra-high power magnetron lead-out transmission system, comprising a ceramic component fixedly mounted at the end of an antenna sleeve and an excitation cavity having an excitation cavity therein;

[0005] The ceramic component comprises a first ring body and a second ring body which are arranged at intervals, and an inner sleeve which is arranged between the first ring body and the second ring body, wherein the first ring body is fixedly arranged at the end of the antenna sleeve, a ceramic sheet is arranged transversely in the inner sleeve, and the ceramic sheet divides the chamber surrounded by the first ring body, the second ring body and the inner sleeve into chamber a and chamber b, and a conductor core is inserted through the ceramic sheet and its two ends are respectively extended into chamber a and chamber b;

[0006] The excitation cavity is provided with a connection port which is detachably connected to the second ring body, an antenna rod a is provided in the antenna sleeve, an antenna rod b is provided in the excitation cavity, antenna rod a is connected to antenna rod b through a conductor core, a hollow adjustment rod is fixed in the excitation cavity, a socket is provided on the adjustment rod, and the end of antenna rod b is inserted into the socket of the antenna seat.

[0007] A vacuum cavity is arranged on the side of the ceramic sheet, and the vacuum cavity comprises a chamber a and an inner cavity of the antenna sleeve communicated with the chamber a.

[0008] An outer sleeve is also provided between the first ring body and the second ring body. The outer sleeve is sleeved on the outer ring of the inner sleeve at intervals. An annular water channel is provided between the inner sleeve and the outer sleeve. The outer sleeve is provided with two pipe joints.

[0009] The antenna rod a and the antenna rod b can both be detachably connected to the conductor core.

[0010] The antenna rod a and the antenna rod b are both threadedly connected to the conductor core.

[0011] The connection port between the second ring body and the excitation cavity is a flange connection.

[0012] The top end of the antenna rod b passes upward through the connecting port and is connected to the conductor core.

[0013] The invention discloses a 403MHz ultra-high power magnetron lead-out transmission system, wherein an antenna rod a, a conductor core and an antenna rod b are coaxially arranged, and the structure of the lead-out antenna adopts a coaxial coupling mode, and vacuum isolation is performed through a ceramic sheet in the middle to form a vacuum cavity, and the microwave transmission efficiency is high; the excitation cavity can be replaced after being damaged, and is suitable for pulse magnetrons with an average power greater than 90kW, a peak power greater than 450kW, and capable of generating 403MHz microwave signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the antenna sleeve and the ceramic component;

[0015] Figure 2 It is a schematic diagram of the structure of the excitation cavity;

[0016] Figure 3 It is a schematic diagram of the structure of the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the antenna sleeve and the anode sleeve;

[0018] Figure 5 It is the S11 curve graph derived by microwave;

[0019] In the figure: connecting sleeve 1, antenna sleeve 2, inner sleeve 3, pipe joint 4, pipe interface 5, second ring body 6, lower flange 7, chamber b8, ceramic sheet 9, outer sleeve 10, first ring body 11, conductor core 12, chamber a13, upper flange 14, excitation cavity 15, adjustment rod 16, socket 17, antenna rod b18, excitation cavity 19, outlet 20, cavity 21, center hole 22, annular water channel 23, antenna rod a24, metal rod 25, ceramic assembly 26, anode blade 27, antenna column 28, cathode assembly 29, anode sleeve 30, connecting port 31. DETAILED DESCRIPTION

[0020] Depend on Figure 1-Figure 4 The 403MHz ultra-high power magnetron lead transmission system shown includes a ceramic component 26 fixed at the bottom of the antenna sleeve 2 and an excitation cavity 19 with an excitation cavity 15 therein. The antenna sleeve 2, the ceramic component 26 and the excitation cavity 19 are arranged in sequence from top to bottom. The antenna sleeve 2 is arranged vertically.

[0021] The ceramic component 26 includes a first ring body 11, a second ring body 6, an inner sleeve 3 and an outer sleeve 10. The first ring body 11 and the second ring body 6 are spaced apart from each other. The first ring body 11 and the second ring body 6 are both in annular shape. The inner sleeve 3 is fixed between the first ring body 11 and the second ring body 6. The outer sleeve 10 is also fixed between the first ring body 11 and the second ring body 6. The outer sleeve 10 is spaced apart on the outer ring of the inner sleeve 3. The first ring body 11 and the second ring body 6 are both welded to the inner sleeve 3. The first ring body 11 and the second ring body 6 are both welded to the outer sleeve 10.

[0022] The first ring body 11 is fixed to the bottom end of the antenna sleeve 2 by welding, and the first ring body 11 is fixed to the lower side of the antenna sleeve 2 .

[0023] A ceramic sheet 9 is fixedly installed laterally in the inner sleeve 3. The ceramic sheet 9 is a circular ring structure with a center hole. The outer ring surface of the ceramic sheet 9 fits the inner wall surface of the inner sleeve 3. The ceramic sheet 9 and the inner sleeve 3 are welded together. The ceramic sheet 9 divides the chamber enclosed by the first ring body, the second ring body and the inner sleeve 3 into two upper and lower chambers: chamber a13 and chamber b8. Chamber a13 is located on the upper side of chamber b8. Chamber a13 is surrounded by the first ring body, the inner sleeve 3 and the ceramic sheet 9. The inner cavity of the antenna sleeve 2 is directly opposite to and connected with chamber a13; chamber b8 is surrounded by the second ring body, the inner sleeve 3 and the ceramic sheet 9.

[0024] A columnar conductor core 12 is inserted through the central hole of the ceramic sheet 9 and its top and bottom ends are respectively extended into the chamber a13 and the chamber b8. The conductor core 12 and the ceramic sheet 9 are also connected by welding.

[0025] The antenna sleeve 2, the first ring body 11, the second ring body 6, the inner sleeve 3, the outer sleeve 10, the ceramic sheet 9 and the conductor core 12 are coaxially arranged, and the central axes of the seven coincide with each other.

[0026] An annular water channel 23 is provided between the inner sleeve 3 and the outer sleeve 10. The annular water channel 23 is formed by the first ring body 11, the second ring body 6, the inner sleeve 3 and the outer sleeve 10. The annular water channel 23 is surrounded by the outer sleeve 3. The outer sleeve 10 is provided with two pipe joints 4. The outer sleeve 10 is provided with two tubular pipe interfaces 5. The pipe interfaces 5 are connected to the annular water channel 23. The two pipe interfaces 5 are respectively connected to the two pipe joints 4. The pipe interfaces 5 are provided with internal threads. The ends of the pipe joints 4 are provided with external threads. The external threads of the pipe joints 4 are threadedly connected with the internal threads of the corresponding pipe interfaces 5. When working, one of the pipe joints 4 is connected to the water inlet pipe, and the other pipe joint 4 is connected to the water outlet pipe. Water flows from the water inlet pipe into the annular water channel 23 and then flows out from the water outlet pipe to cool the chamber a13 and the chamber b8. The water inlet pipe and the water outlet pipe are not shown in the figure. The annular water channel 23 is mainly used to take away the huge heat generated near the ceramic sheet 9 when the magnetron is working to prevent the ceramic sheet 9 from being melted due to overheating.

[0027] An excitation cavity 15 is arranged inside the excitation cavity 19. The excitation cavity 19 is a hollow structure and is in the shape of a shell. An outlet 20 is arranged on the side of the excitation cavity 15. The microwaves in the excitation cavity 15 are output outwardly from the outlet 20. A connecting port 31 detachably connected to the second ring body 6 is arranged at the top of the excitation cavity 19. The connecting port 31 is a vertical tubular structure. Of course, the connecting port 31 is connected to the excitation cavity 15 in the excitation cavity 19.

[0028] The connecting port of the second ring body 6 and the excitation cavity 19 is a flange connection. The lower side of the second ring body 6 is fixedly connected to an upper flange 14 by welding. The top of the connecting port of the excitation cavity 19 is fixedly connected to a lower flange 7 by welding. The second ring body 6 is coaxially arranged with the upper flange 14. The connecting port is coaxially arranged with the lower flange 7. The upper flange 14 is fixedly connected to the upper side of the lower flange 7 by a number of bolts.

[0029] A vertical antenna rod a24 is arranged inside the antenna sleeve 2. The antenna sleeve 2 is sleeved on the outer circle of the antenna rod a24 at intervals. The antenna sleeve 2 and the antenna rod a24 are coaxially arranged.

[0030] A vertical antenna rod b18 is arranged in the excitation cavity 19, and the antenna rod b18 extends into the excitation cavity.

[0031] The antenna rod a24 is connected to the antenna rod b18 through the conductor core 12. The antenna rod a24, the conductor core 12 and the antenna rod b18 are arranged in sequence from top to bottom and are coaxially arranged, that is, the central axes of the three coincide. The top end of the antenna rod b18 passes through the connecting port 31 upward and is connected to the conductor core 12. The top end of the conductor core 12 extends upward into the antenna sleeve 2. The antenna rod a24 and the antenna rod b18 can both be disassembled and connected to the conductor core 12. Furthermore, the antenna rod a24 and the antenna rod b18 are both threadedly connected to the conductor core 12. The top and bottom ends of the conductor core 12 are both provided with external threads. The bottom end of the antenna rod a24 and the top end of the antenna rod b18 are both provided with screw holes. The top end of the conductor core 12 is threadedly connected to the screw hole at the bottom end of the antenna rod a24, and the bottom end of the conductor core 12 is threadedly connected to the screw hole at the top end of the antenna rod b18. The top end of the antenna rod b passes through the connecting port 31, the center hole of the lower flange and the center hole of the upper flange in sequence, and then extends into the chamber b, and then is threadedly connected to the bottom end of the conductor core. The antenna rod a24, the conductor core 12 and the antenna rod b18 are coaxially arranged, and the antenna rod a24, the conductor core 12 and the antenna rod b18 are connected in sequence from top to bottom to form a coaxial coupling structure.

[0032] Furthermore, the antenna rod a24 and the antenna rod b18 are both hollow rods. Of course, the antenna rod a24 and the antenna rod b18 can also be solid rods.

[0033] A hollow adjusting rod 16 is fixed in the excitation cavity 19. The adjusting rod 16 is arranged in the bottom of the excitation cavity 15 and is fixed to the bottom plate of the excitation cavity 19 by bolts. A cavity 21 is arranged in the adjusting rod 16. The adjusting rod 16 is provided with a tubular socket 17, which is connected to the cavity 21 in the adjusting rod 16. The bottom end of the antenna rod b18 is inserted into the antenna seat socket 17. The antenna rod b18 is fixedly connected to the adjusting rod 16 by welding.

[0034] The upper and lower sides of the ceramic plate 9 are respectively provided with a vacuum chamber and a lower chamber, the vacuum chamber includes chamber a13 and the inner cavity of the antenna sleeve 2 connected to chamber a13, the lower chamber includes chamber b8 and the excitation chamber 15 in the excitation chamber 19 connected to chamber b8, chamber b8 is connected to the excitation chamber 15 through the connection port 31 of the excitation chamber 19, specifically, the upper flange 14 and the lower flange 7 are both provided with a center hole 22, chamber b8, the center hole 22 of the upper flange 14, the center hole 22 of the lower flange 7, the connection port 31 and the excitation chamber 15 are connected in sequence from top to bottom to form the lower chamber. The air pressure of the lower chamber is normal pressure.

[0035] A 403MHz ultra-high power magnetron lead-out transmission system described in the present invention is applied in a magnetron, wherein the upper side of an antenna sleeve 2 is butt-jointed with a connecting sleeve 1 by welding, and the upper side of the connecting sleeve 1 is butt-jointed with an anode sleeve 30 by welding, and the top port and the bottom port of the connecting sleeve 1 are respectively directly opposite to the bottom port of the anode sleeve 30 and the top port of the antenna sleeve 2, and a plurality of anode blades 27 are arranged on the inner wall of the anode sleeve 30, and a resonance cavity is arranged in the anode sleeve 30, and the upper side of the anode sleeve 30 is butt-jointed with a cathode assembly 29, and the top end of the cathode assembly 29 is closed, and the chamber a, the inner cavity of the antenna sleeve 2, the inner cavity of the connecting sleeve 1, the resonance cavity in the anode sleeve 30 and the inner cavity of the cathode assembly 29 are sequentially connected from bottom to top, and the chamber formed by the five is also a vacuum chamber.

[0036] The bottom end of at least one anode blade 27 is fixedly connected to the antenna post 28, and the metal rod 25 is fixedly connected between the bottom end of the antenna post 28 and the top end of the antenna rod a24.

[0037] Figure 5 This is the S11 curve derived from microwaves. In the figure, the horizontal axis is Frequency, and S-Parameters [Magnitude in dB] is S parameters [magnitude displayed in dB]. S11 is one of the S parameters, which represents the return loss characteristics. It can be seen that the closer the frequency is to 403MHz, the lower the S11 value is, and the higher the microwave transmission efficiency is. When the frequency is 403MHz, the S11 value is -51.592147.

[0038] The invention discloses a 403MHz ultra-high power magnetron extraction transmission system, wherein an antenna rod a, a conductor core and an antenna rod b are coaxially arranged, and the structure of the extraction antenna adopts a coaxial coupling mode, microwaves are sequentially input into an excitation cavity through the antenna rod a, the conductor core and the antenna rod b, and the microwaves are then output outward from the outlet of the excitation cavity, and vacuum isolation is performed through a ceramic sheet in the middle to form a vacuum cavity, and the microwave transmission efficiency is high; the excitation cavity can be replaced after being damaged, and is suitable for pulse magnetrons with an average power greater than 90kW, a peak power greater than 450kW, and capable of generating 403MHz microwave signals.

Claims

1. A 403MHz ultra-high power magnetron lead-out transmission system, characterized in that: It comprises a ceramic component (26) fixedly mounted on the end of an antenna sleeve (2) and an excitation cavity (19) having an excitation cavity (15) therein; The ceramic component (26) comprises a first ring body (11) and a second ring body (6) arranged at intervals, and an inner sleeve (3) arranged between the first ring body (11) and the second ring body (6); the first ring body (11) is fixedly arranged at the end of the antenna sleeve (2); a ceramic sheet (9) is transversely arranged in the inner sleeve (3); the ceramic sheet (9) divides the chamber enclosed by the first ring body, the second ring body and the inner sleeve (3) into chamber a (13) and chamber b (8); a conductor core (12) is inserted through the ceramic sheet (9) and its two ends extend into chamber a (13) and chamber b (8) respectively; The excitation cavity (19) is provided with a connection port (31) which is detachably connected to the second ring body (6); an antenna rod a (24) is provided in the antenna sleeve (2); an antenna rod b (18) is provided in the excitation cavity (19); the antenna rod a (24) is connected to the antenna rod b (18) via a conductor core (12); a hollow adjustment rod (16) is fixed in the excitation cavity (19); the adjustment rod (16) is provided with a socket (17); and the end of the antenna rod b (18) is inserted into the socket (17) of the antenna seat.

2. A 403MHz ultra-high power magnetron lead-out transmission system as claimed in claim 1, characterized in that: A vacuum cavity is arranged on the side of the ceramic sheet (9), and the vacuum cavity comprises a chamber a (13) and an inner cavity of the antenna sleeve (2) which is in communication with the chamber a (13).

3. A 403MHz ultra-high power magnetron lead-out transmission system as claimed in claim 1, characterized in that: An outer sleeve (10) is provided between the first ring body (11) and the second ring body (6). The outer sleeve (10) is sleeved on the outer ring of the inner sleeve (3) at intervals. An annular water channel (23) is provided between the inner sleeve (3) and the outer sleeve (10). The outer sleeve (10) is provided with two pipe joints (4).

4. A 403MHz ultra-high power magnetron lead-out transmission system as claimed in claim 1, characterized in that: The antenna rod a (24) and the antenna rod b (18) can both be detachably connected to the conductor core (12).

5. A 403MHz ultra-high power magnetron lead-out transmission system as claimed in claim 3, characterized in that: The antenna rod a (24) and the antenna rod b (18) are both threadedly connected to the conductor core (12).

6. A 403MHz ultra-high power magnetron lead-out transmission system as claimed in claim 1, characterized in that: The connection port (31) between the second ring body (6) and the excitation cavity (19) is flange-connected.

7. A 403MHz ultra-high power magnetron extraction transmission system as claimed in claim 1, characterized in that: The top end of the antenna rod b (18) passes through the connection port (31) upwards and is connected to the conductor core (12).

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