Cathode generating device for open type microfocus ray tube

Abstract

The utility model relates to the technical field of open-tube micro-focus ray tubes, and provides a cathode generating device for an open-tube micro-focus ray tube, which comprises a grid cap, a filament assembly, a grid fixing seat and a high-voltage sleeve, a grid fixing seat is fixedly arranged at the top of the high-pressure sleeve; a lamp filament assembly is arranged on the grid electrode fixing seat; a grid cap is detachably arranged on the grid fixing seat; the grid cap wraps the filament assembly. The lamp filament assembly comprises a lamp filament assembly shell, a lamp filament, a ceramic base and two pole needles. The bottom of the pole needle is connected with a filament pole of the high-voltage sleeve; the pole needle is fixedly connected with the ceramic seat, and the top of the pole needle extends out of the ceramic seat; the tops of the two pole needles are connected with the two ends of the lamp filament respectively. The ceramic seat is provided with a filament assembly housing. And the lamp filament assembly shell covers the lamp filament, the ceramic seat and the pole needle. The lamp filament can be replaced conveniently, and fine adjustment of the position of the high-voltage sleeve is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to open tube type micro focus ray tube technical field, especially a kind of cathode generating device for open micro focus ray tube. BACKGROUND

[0002] Micro focus ray tube is divided into closed type and open type in packaging structure.Closed type is X ray tube when it is factory is a vacuum tube.Open type is that the working environment of X ray tube is completed by vacuum pump vacuumization.The reasons of X ray tube damage are usually that vacuum degree drops seriously, filament fuses, target surface is severely eroded and the like.Closed type micro focus ray tube is unrecoverable.Open micro focus ray tube can be repaired by replacing parts.

[0003] Cathode generating device is an important component of micro focus ray tube, and the structure of cathode generating device for open micro focus ray tube is installed and fixed by high-pressure sleeve, filament assembly and the like parts at present.Cathode shell needs to be set outside cathode generating device, and the cathode generating device and cathode shell cannot be adjusted at present, and the machining precision and assembly precision of related parts are required to be higher.Current filament assembly is composed of multiple parts, and due to the reason of hierarchical installation, filament replacement needs to be disassembled as a whole, which is time-consuming and laborious.Filament assembly is one of ray tube wearing parts, and filament assembly is not easy to replace if damaged, so a structure capable of being replaced quickly and maintained conveniently is required.The high-pressure sleeve of current cathode generating device is mostly ceramic in material, and electrode needle is common point, large focus and small focus;And there is no structure with grid, so that the control of tube current is more difficult, and the focusing effect of primary electron beam is also lacked.In addition, the current cathode generating device is extremely expensive and has high cost. SUMMARY

[0004] The utility model mainly solves the technical problem that the filament assembly of cathode generating device for open micro focus ray tube in prior art is not easy to replace if damaged, and the machining precision and assembly precision of parts are required to be too high, and proposes a cathode generating device for open micro focus ray tube to facilitate filament replacement and realize high-pressure sleeve position fine adjustment.

[0005] The utility model provides a kind of cathode generating device for open micro focus ray tube, comprising: grid cap, filament assembly, grid fixed base and high-pressure sleeve;

[0006] The high-pressure sleeve top is fixedly provided with grid fixed base;

[0007] The filament assembly is arranged on the grid fixed base;Grid cap is detachably arranged on the grid fixed base;The filament assembly is wrapped in the grid cap;

[0008] The filament assembly comprises a filament assembly shell, a filament, a ceramic seat and two pole pins.

[0009] The bottom of the pole pin is connected with the filament pole of the high-voltage sleeve; the pole pin is fixedly connected with the ceramic seat, and the top of the pole pin extends from the ceramic seat; the top of each of the two pole pins is connected with one end of the filament;

[0010] The ceramic seat is provided with the filament assembly shell; the filament assembly shell covers the filament, the ceramic seat and the pole pin.

[0011] The center of the filament assembly shell and the center of the grid cap are respectively provided with an exit hole.

[0012] Preferably, the bottom of the high-voltage sleeve is fixedly provided with a high-voltage sleeve flange.

[0013] Preferably, the grid fixed seat is uniformly provided with a plurality of clamping spring mechanisms in the circumferential direction.

[0014] The grid cap is detachably arranged on the grid fixed seat through the clamping spring mechanism.

[0015] Preferably, the filament is directly welded and fixed on the pole pin.

[0016] Preferably, the filament is in an obtuse angle shape.

[0017] Preferably, the grid cap, the filament assembly shell and the grid fixed seat are all made of metal materials.

[0018] The grid fixed seat is connected with the common contact of the high-voltage sleeve.

[0019] The grid fixed seat is in contact with the grid cap and the filament assembly shell, and the grid cap is in contact with the filament assembly shell.

[0020] Preferably, the filament assembly shell is fixed with the ceramic seat through a top pin.

[0021] Preferably, the pole pin is fixedly connected with the ceramic seat through ceramic metallization.

[0022] This invention provides a cathode generating device for an open-type microfocus X-ray tube. The structure is decomposed into multiple components for assembly, allowing for replacement of the filament if a problem occurs. A retaining spring mechanism and a set screw facilitate filament replacement. A high-pressure sleeve flange is installed at the rear end of the high-pressure sleeve, connecting it to the cathode housing. The flange allows for fine-tuning of the high-pressure sleeve, simplifying adjustments and reducing the requirements for assembly precision. A grid is introduced into the cathode generating device, enabling better control of the tube current and simultaneously providing primary focusing of the electron beam. The electrode needle and ceramic base are fixed through a ceramic metallization connection, solving the connection problem between the ceramic and the electrode needle and avoiding the influence of third-party media on quality and the vacuum within the open-type microfocus X-ray tube. Direct welding of the filament to the electrode needle avoids the influence of transition metals on filament performance. This cathode generating device, applied to open-type microfocus X-ray tubes, allows for lower requirements on vacuum components in the selection of materials for internal parts. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a cathode generating device for an open microfocus ray tube provided by this utility model.

[0024] Reference numerals: 01, Grid cap; 02, Filament assembly housing; 03, Filament; 04, Ceramic base; 05, Electrode pin; 06, Set screw; 07, Snap ring mechanism; 08, Grid fixing base; 09, High-voltage sleeve; 10, High-voltage sleeve flange. Detailed Implementation

[0025] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0026] like Figure 1 As shown in the figure, the present invention provides a cathode generating device for an open microfocus X-ray tube, comprising: a grid cap 01, a filament assembly, a grid fixing seat 08, and a high-voltage sleeve 09.

[0027] The high-voltage sleeve 09 is an insulating component for connecting high voltage. It not only ensures the stability and safety of the circuit connection, but also effectively prevents current leakage and electrical faults in the circuit. The high-voltage sleeve 09 has two filament poles and a common contact.

[0028] A gate fixing seat 08 is fixedly installed on the top of the high-pressure sleeve 09; a high-pressure sleeve flange 10 is fixedly installed on the bottom of the high-pressure sleeve 09. The cathode generator is installed in the cathode housing of the open microfocus X-ray tube through the high-pressure sleeve flange 10. The high-pressure sleeve flange 10 is installed through the set screw that fits the flange. By adjusting the set screw, the high-pressure sleeve 09 can be finely adjusted in position within the cathode housing of the open microfocus X-ray tube.

[0029] A filament assembly is provided on the gate fixing base 08; a gate cap 01 is detachably provided on the gate fixing base 08; the gate cap 01 encloses the filament assembly.

[0030] The filament assembly includes: a filament assembly housing 02, a filament 03, a ceramic base 04, and two pole pieces 05. The bottom of each pole piece 05 is connected to the filament pole of the high-voltage sleeve 09; the pole piece 05 is fixedly connected to the ceramic base 04, and the top of the pole piece 05 extends from the ceramic base 04; the tops of the two pole pieces 05 are respectively connected to both ends of the filament 03; the filament 03 is obtuse-angled. The filament 03 is directly welded to the pole pieces 05. Direct welding is used to eliminate the transition metal and remove its influence on stability.

[0031] A filament assembly housing 02 is mounted on the ceramic base 04. The filament assembly housing 02 covers the filament 03, the ceramic base 04, and the electrode 05. An emission hole is provided at the center of both the filament assembly housing 02 and the grid cap 01. The filament assembly housing 02 is fixed to the ceramic base 04 by a set screw 06, thus securing the filament 03, ceramic base 04, and electrode 05 within the filament assembly housing 02. Adjusting and removing the set screw 06 facilitates the replacement and disassembly of the filament assembly.

[0032] The gate fixing base 08 has multiple snap ring mechanisms 07 evenly distributed in the circumferential direction; the gate cap 01 is detachably mounted on the gate fixing base 08 via the snap ring mechanisms 07. Considering the frequent replacement of the filament assembly, the snap ring mechanisms 07 are provided. Pressing the snap ring mechanisms 07 can open the gate cap 01, making filament replacement more convenient.

[0033] The electrode needle 05 and the ceramic base 04 are fixed together by ceramic metallization. By selecting materials and degassing the ceramic base 04, the gas content inside the ceramic base 04 is minimized, reducing its impact on the ultimate vacuum of the open microfocus X-ray tube. Through the ceramic metallization process, the connecting medium is changed, its high-temperature resistance is improved, and its original defects are eliminated.

[0034] The gate holder 08 is connected to the common contact of the high-voltage sleeve 09; the gate holder 08 is in contact with the gate cap 01 and the filament assembly housing 02, and the gate cap 01 is in contact with the filament assembly housing 02. The gate cap 01, the filament assembly housing 02, and the gate holder 08 are all made of metal. Therefore, the gate cap 01, the filament assembly housing 02, and the gate holder 08 can be electrically connected. The gate cap 01, by controlling the tube current, can focus the electron beam, thus realizing the gate function.

[0035] In the assembly of this invention, after fixing the grid fixing seat 08 onto the high-voltage sleeve 09, the filament assembly housing 02, filament 03, ceramic seat 04, electrode needle 05, and set screw 06 are then fixed onto the high-voltage sleeve 09. Finally, the grid cap 01 is fixed by the snap ring mechanism 07. The grid cap 01 completely encloses the filament assembly housing 02, filament 03, ceramic seat 04, electrode needle 05, and set screw 06. In application, the entire cathode generator is connected and fixed to the open microfocus ray tube via the high-voltage sleeve flange 10.

[0036] The working principle of the cathode generating device for an open microfocus X-ray tube of this utility model is as follows: High voltage is connected to filament 03 through high voltage sleeve 09, and electron beam is emitted by filament 03. The focusing of the electron beam is controlled by grid cap 01, so that the focused electron beam can smoothly enter the anode part of the open microfocus X-ray tube.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions for some or all of the technical features, do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cathode generating device for an open-type microfocus ray tube, characterized in that, include: Gate cap (01), filament assembly, gate holder (08), and high voltage sleeve (09); A gate fixing seat (08) is fixedly installed on the top of the high-voltage sleeve (09); A filament assembly is disposed on the gate holder (08); a gate cap (01) is detachably disposed on the gate holder (08); the gate cap (01) encloses the filament assembly. The filament assembly includes: a filament assembly housing (02), a filament (03), a ceramic base (04), and two electrode pins (05); The bottom of the electrode (05) is connected to the filament electrode of the high-pressure sleeve (09); the electrode (05) is fixedly connected to the ceramic seat (04), and the top of the electrode (05) extends out of the ceramic seat (04); the tops of the two electrode (05) are respectively connected to the two ends of the filament (03). The ceramic base (04) is provided with a filament assembly housing (02); the filament assembly housing (02) covers the filament (03), the ceramic base (04) and the electrode (05); The filament assembly housing (02) and the grid cap (01) each have an emission hole at their center.

2. The cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The high-pressure sleeve (09) is fixedly provided with a high-pressure sleeve flange (10) at the bottom.

3. A cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The gate fixing base (08) has multiple snap ring mechanisms (07) evenly distributed in the circumferential direction; The gate cap (01) is detachably mounted on the gate mounting base (08) via a snap ring mechanism (07).

4. A cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The filament (03) is directly welded and fixed to the electrode needle (05).

5. A cathode generating device for an open-type microfocus ray tube according to claim 4, characterized in that, The filament (03) is obtuse-angled.

6. A cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The gate cap (01), the filament assembly housing (02), and the gate holder (08) are all made of metal. The gate holder (08) is connected to the common contact of the high voltage sleeve (09); The gate holder (08) is in contact with the gate cap (01) and the filament assembly housing (02), and the gate cap (01) is in contact with the filament assembly housing (02).

7. A cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The filament assembly housing (02) is fixed to the ceramic base (04) by a set screw (06).

8. A cathode generating device for an open-type microfocus ray tube according to claim 1, characterized in that, The electrode needle (05) and the ceramic base (04) are fixed together by ceramic metallization.

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