Corrugated ceramic X-ray tube

Abstract

A corrugated ceramic X-ray tube is characterized in that an anode assembly is arranged on the corrugated ceramic X-ray tube, the anode assembly is connected to the lower end of a tube shell assembly, a cathode assembly is mounted at the other end of the tube shell assembly, and a cathode lead cap is mounted at the top end of the tube shell assembly. The corrugated ceramic X-ray tube adopts a tube shell with a corrugated ceramic structure, the tube shell is matched and sealed with a kovar ring in a sealing manner, the tube shell is matched and sealed with a flange connecting ring in a flat sealing manner, brazing with a very high sealing requirement between ceramic and metal is completed by using a solder in a vacuum or hydrogen furnace, and the voltage-resistant insulating strength of the shell is enhanced. The corrugated ceramic tube shell enables the ray tube to be higher in mechanical strength, more reliable and safer, the ray tube is miniaturized when the ray tube is used on a portable computer, and real-time imaging is completed. The window is arranged on the lower half portion of the X-ray tube, compared with a glass tube, no glass shell is arranged outside the beryllium window, X-ray absorption of the window is reduced, mechanical strength is high, service life is longer, and application is wider.

Description

Technical Field

[0001] The utility model relates to an X-ray tube, in particular to a corrugated ceramic X-ray tube capable of irradiation, food detection, thickness measurement, DR and CT. Background Art

[0002] The corrugated ceramic shell in the corrugated ceramic X-ray tube is one of the most basic features of the corrugated ceramic structure X-ray tube. At present, most of the products of this type on the market use glass shells, which are thin, have low pressure resistance, low insulation strength, and insufficient insulation strength. Shell breakdown often occurs in actual use. The utility model can replace the glass tubes of this type on the market. The corrugated ceramic structure used effectively increases the creepage distance of the charge on the ceramic surface and greatly improves the insulation strength. Since the ceramic can withstand a high temperature of 1300 degrees, the corrugated ceramic structure can better withstand secondary electron bombardment. At the same time, the mechanical strength of the corrugated ceramic structure is also higher, thereby increasing the life of the X-ray tube. The ceramic shell is changed from the traditional seven corrugations to six corrugations, which reduces the external dimensions while meeting the use requirements, making installation and use more convenient, and the process control is simple, which plays a decisive role in eliminating stress and ensuring sealing. Utility Model Content

[0003] In view of the above problems, the utility model provides a corrugated ceramic X-ray tube which can adapt to this work.

[0004] The technical measures taken to solve the above technical problems are:

[0005] A corrugated ceramic X-ray tube, characterized in that: an anode assembly 1 is provided on the corrugated ceramic X-ray tube, the anode assembly 1 is connected to the lower end of a tube shell assembly 2, a cathode assembly 3 is installed at the other end of the tube shell assembly 2, and a cathode lead cap 4 is installed at the top end of the tube shell assembly 2;

[0006] The anode assembly 1 is composed of an anode body 11, an anode target 12, a window 13, and a transition ring 14. The anode target 12 is fixed to the center of the anode body 11 by brazing. The window 13 is installed on the left side of the anode body 11 and is sealed by brazing. The transition ring 14 is installed on the upper part of the anode body 11 and is sealed by brazing.

[0007] The tube shell assembly 2 is composed of a cuttable ring 21, a tube shell 22 and a flange connection ring 23. The cuttable ring 21 and the tube shell are connected to the lower end of the tube shell 22 by brazing, and the flange connection ring 23 is connected to the upper end of the tube shell 22 by brazing.

[0008] The cathode assembly 3 is composed of a cathode sleeve 31, a cathode head 32, a molybdenum rod 33, a porcelain column 34, a filament 35, a cathode bracket 36, an exhaust pipe 37, a transition section 38, and an electrode needle 39. The cathode assembly 3 is provided with a cathode head 32, the porcelain column 34 is riveted on the cathode head 32, the molybdenum rod 33 is passed through the inner hole of the porcelain column 34, the two legs of the filament 35 are respectively fixed on one end of the two molybdenum rods 33, the cathode sleeve 31 is sleeved on the outside of the cathode head 32, the bottom end of the cathode bracket 36 is spot welded to the cathode head 32, the exhaust pipe 37 is brazed on the cathode bracket 36, the other end of the exhaust pipe 37 is brazed and connected to the transition section 38, and the electrode needle 39 is brazed on the cathode 36.

[0009] Positive effects of the utility model:

[0010] The X-ray tube in the utility model adopts a tube shell of a corrugated ceramic structure. The ceramic has good pressure resistance and high temperature resistance, corrosion resistance, wear resistance, high insulation strength, stable electrical properties, strong structure, not easy to break, and easy processing. Due to its excellent electrical properties, the tube shell used to make the X-ray tube can greatly reduce the shell size and reduce the weight. At the same time, the corrugated structure increases the resistivity of its outer surface, thereby increasing the high-voltage insulation strength. The ceramic shell of the utility model is changed from the traditional seven corrugations to six corrugations. The six corrugations make the tube shell have high insulation strength, and the outer diameter and length are reduced compared with the traditional glass shell and the original corrugated ceramic shell. The outer diameter of the corrugated ceramic shell is reduced from 98mm of other tube types to 56mm, and the length is reduced from 96mm to 81mm. At the same time, the size of other parts in this product is also reduced, which means that the overall size of this product has become smaller, lighter and more compact, making installation and use more convenient. The Koval ring is sealed with the six-corrugated ceramic shell, and the flange connection ring and the six-corrugated ceramic shell adopt a flat sealing structure, which is convenient for sealing accuracy and positioning, and the process control is simple, which plays a decisive role in eliminating stress and ensuring sealing. Finally, the brazing between ceramic and metal with high sealing requirements is completed in a vacuum or hydrogen furnace with solder, which enhances the voltage resistance and insulation strength of the shell. Compared with glass tubes, there is no glass shell outside the beryllium window of the corrugated ceramic X-ray tube, which reduces the absorption of X-rays by the window, and has high mechanical strength, longer service life, more reliable, safer, and more widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model;

[0012] Figure 2 It is a cross-sectional view of the anode assembly in the utility model;

[0013] Figure 3 It is a cross-sectional view of the tube-shell assembly in the utility model;

[0014] Figure 4 It is a cross-sectional view of the cathode assembly in the utility model. DETAILED DESCRIPTION

[0015] The utility model is described in detail below in conjunction with the accompanying drawings.

[0016] A corrugated ceramic X-ray tube, such as Figure 1 As shown, an anode assembly 1 is provided on the corrugated ceramic X-ray tube, and the anode assembly 1 is connected to the lower end of the tube shell assembly 2. A cathode assembly 3 is installed at the other end of the tube shell assembly 2, and a cathode lead cap 4 is installed at the top of the tube shell assembly 2.

[0017] Figure 2 It is a cross-sectional view of the anode assembly in the utility model. The anode assembly 1 consists of an anode body 11, an anode target 12, a window 13, and a transition ring 14. The anode target 12 is fixed to the center of the anode body 11 by brazing. The window 13 is installed on the left side of the anode body 11 and is sealed by brazing. A transition ring 14 is installed on the upper part of the anode body 11 and is sealed by brazing.

[0018] Figure 3 It is a cross-sectional view of the X-ray tube shell assembly in the utility model. The tube shell assembly 2 is composed of a cuttable ring 21, a tube shell 22 and a flange connection ring 23. The cuttable ring 21 tube shell is connected to the lower end of the tube shell 22 by brazing, and the flange connection ring 23 is connected to the upper end of the tube shell 22 by brazing.

[0019] Figure 4 It is a cross-sectional view of the cathode assembly in the utility model. The cathode assembly 3 is composed of a cathode sleeve 31, a cathode head 32, a molybdenum rod 33, a porcelain column 34, a filament 35, a cathode support 36, an exhaust pipe 37, a transition section 38, and an electrode needle 39. The cathode assembly 3 is provided with a cathode head 32, the porcelain column 34 is riveted on the cathode head 32, the molybdenum rod 33 is passed through the inner hole of the porcelain column 34, the two legs of the filament 35 are respectively fixed on one end of the two molybdenum rods 33, the cathode sleeve 31 is sleeved on the outside of the cathode head 32, the bottom end of the cathode support 36 is spot welded with the cathode head 32, the exhaust pipe 37 is brazed on the cathode support 36, the other end of the exhaust pipe 37 is brazed and connected to the transition section 38, and the electrode needle 39 is brazed on the cathode support 36.

[0020] When the utility model is working, it is actually a vacuum diode working under high voltage, which has two electrodes, one is a filament 35 for emitting electrons, which together with a cathode sleeve 31, a cathode head 32, a molybdenum rod 33, a porcelain column 34, a cathode support 36, an exhaust pipe 37, a transition section 38, and an electrode needle 39 constitute a cathode assembly 3. The other is an anode target 12 for receiving high-speed electron bombardment, which together with an anode body 11, a window 13, and a transition ring 14 constitute an anode assembly 1, which are sealed in a high-vacuum tube shell assembly 2 and used in conjunction with a high-frequency constant voltage power supply. When the filament 35 passes enough current to generate an electron cloud, and a sufficient kilovolt-level voltage is applied between the filament and the anode target, the electron cloud is pulled toward the anode target part, and at this time, the electrons hit the anode target in a high-energy and high-speed state, and the high-speed electrons reach the target surface, and the movement is suddenly stopped, and a small part of their kinetic energy is converted into radiation energy, which is emitted through the window 13 in the form of X-rays for use.

Claims

1. A corrugated ceramic X-ray tube, characterized in that: An anode assembly (1) is provided on the corrugated ceramic X-ray tube. The anode assembly (1) is connected to the lower end of a tube shell assembly (2). A cathode assembly (3) is installed at the other end of the tube shell assembly (2). A cathode cap (4) is installed at the top end of the tube shell assembly (2). The anode assembly (1) is composed of an anode body (11), an anode target (12), a window (13), and a transition ring (14). The anode target (12) is fixed to the center of the anode body (11) by brazing. The window (13) is installed on the left side of the anode body (11) and is sealed by brazing. The transition ring (14) is installed on the upper part of the anode body (11) and is sealed by brazing. The tube shell assembly (2) is composed of a cuttable ring (21), a tube shell (22) and a flange connection ring (23), wherein the cuttable ring (21) and the tube shell are connected to the lower end of the tube shell (22) by brazing, and the flange connection ring (23) is connected to the upper end of the tube shell (22) by brazing; The cathode assembly (3) is composed of a cathode sleeve (31), a cathode head (32), a molybdenum rod (33), a porcelain column (34), a filament (35), a cathode support (36), an exhaust pipe (37), a transition section (38), and an electrode needle (39). The cathode assembly (3) is provided with a cathode head (32), the porcelain column (34) is riveted on the cathode head (32), the molybdenum rod (33) is inserted into the inner hole of the porcelain column (34), two legs of the filament (35) are respectively fixed to one end of two molybdenum rods (33), the cathode sleeve (31) is sleeved on the outside of the cathode head (32), the bottom end of the cathode support (36) is spot welded to the cathode head (32), the exhaust pipe (37) is brazed to the cathode support (36), the other end of the exhaust pipe (37) is brazed to the transition section (38), and the electrode needle (39) is brazed to the cathode support (36).

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