Grid-control x-ray combined machine head

Abstract

The invention relates to an x-ray combined machine head with grid-control capability, and aims to solve the problem of how to arrange a grid-control x-ray bulb tube, a high-voltage transformer, a high-voltage rectification and high-voltage detection circuit, a filament and grid control circuit and a power supply thereof in a specific appearance structure and a limited space of the combined machine head. And meanwhile, the safe distance between high-voltage potentials in the combined machine head is ensured, and the pressure and interference of a high-voltage electric field and a magnetic field on a low-voltage part are avoided.

Description

Technical Field

[0001] The invention belongs to X-ray equipment, and in particular relates to an X-ray combined machine head with grid control capability. Background Art

[0002] At present, there are traditional X-ray combination heads on the market, as well as grid control systems used in large equipment. However, due to the complexity and bulkiness of the grid control system, the grid control technology has not been used in the X-ray combination head. Our company has invented a combination head with grid control capabilities and applied for a patent for the implementation method (application number: 201910166518.5). On this basis, we apply for this patent for the innovative structure of the X-ray grid control combination head. Summary of the invention

[0003] The purpose of the present invention is to solve how to arrange components such as X-ray tubes, high-voltage transformers and voltage-doubler rectifier modules, filaments and grid control modules, and power supplies within the specific appearance structure and limited space of the combined head, while ensuring a safe distance between the high-voltage potentials inside the combined head and avoiding pressure and interference of high-voltage electric and magnetic fields on low-voltage components.

[0004] The technical solution of the present invention is as follows: The present invention is an X-ray combined head with grid control capability, as shown in the attached drawings, including a housing 1, an X-ray tube 2, a high-voltage transformer 3, a voltage-doubling rectifier positive-pressure module 4.1, a voltage-doubling rectifier negative-pressure module 4.2, a filament and grid control module and a power supply 5, an insulating fixing plate 6.1, an insulating fixing plate 6.2 and other components. The X-ray tube 2, the high-voltage transformer 3, the voltage-doubling rectifier positive-pressure module 4.1, the voltage-doubling rectifier negative-pressure module 4.2, the filament and grid control module and a power supply 5, the insulating fixing plates 6.1 and 6.2 are all placed inside the housing 1, and the inside of the housing 1 is filled with insulating oil or other insulating materials. An insulating fixing plate 6.1 is provided on a side surface along the axis of the x-ray tube 2, and the high-voltage transformer 3, the voltage-doubling rectifier positive-voltage module 4.1 and the voltage-doubling rectifier negative-voltage module 4.2 are provided on the insulating fixing plate 6.1, wherein the voltage-doubling rectifier positive-voltage module 4.1 is close to the anode of the x-ray tube 2, the voltage-doubling rectifier negative-voltage module 4.2 is close to the cathode of the x-ray tube 2, and the high-voltage transformer 3 is between the voltage-doubling rectifier positive-voltage module 4.1 and the voltage-doubling rectifier negative-voltage module 4.2. An insulating fixing plate 6.2 is provided at the cathode end of the x-ray tube 2, and the filament and grid control module and the power supply 5 are provided on the insulating fixing plate 6.2.

[0005] Furthermore, a low voltage DC power supply, a filament control module and a gate control module are provided on the filament and grid control module and the power supply 5. The lowest voltage multiplication level of the voltage doubler rectifier positive voltage module 4.1 and the voltage doubler rectifier negative voltage module 4.2 are both close to the high voltage transformer 3, and the voltage multiplication levels increase in sequence in the direction away from the high voltage transformer 3.

[0006] Furthermore, the secondary of the high-voltage transformer 3 is connected to the input ends of the voltage-doubling rectifier positive-pressure module 4.1 and the voltage-doubling rectifier negative-pressure module 4.2, the output end of the voltage-doubling rectifier positive-pressure module 4.1 is connected to the anode of the x-ray tube 2, the output end of the voltage-doubling rectifier negative-pressure module 4.2 is connected to the cathode of the x-ray tube 2, and is also connected to the common end of the low-voltage DC power supply, the filament control module and the grid control module; the outputs of the filament control module and the grid control module are connected to the filament and the grid of the x-ray tube 2.

[0007] Furthermore, in order to allow the filament control module and the grid control module to operate stably and reduce electromagnetic field and electromagnetic wave interference, the outside of the filament control module and the grid control module are shielded with a metal sheet, and wires are led out from the metal sheet and connected to the output end of the voltage doubler rectifier negative pressure module 4.2 or the cathode of the x-ray tube 2.

[0008] The above structural arrangement achieves the purpose of our invention. The electric field distribution law of the internal space of the shell 1 is that the middle part and its vicinity of the x-ray tube 2 are at low voltage and the two ends and their vicinity of the x-ray tube 2 are at high voltage, wherein the side close to the cathode of the x-ray tube 2 is negative high voltage, and the side close to the anode of the x-ray tube 2 is positive high voltage. The high-voltage transformer 3 itself is low voltage, and its position is just in the low-voltage area of ​​the middle part and its vicinity of the x-ray tube, while the basic potential of the filament and grid control module and the power supply 5 is negative high voltage, and its position is arranged on the cathode side of the x-ray tube 2, which is conducive to increasing the insulation distance between it and positive high-voltage components such as the anode of the x-ray tube 2 and the voltage-doubling rectifier positive voltage module 4.1. The voltage-doubling levels of the voltage-doubling rectifier positive voltage module 4.1 and the voltage-doubling rectifier negative voltage module 4.2 increase step by step from the position close to the high-voltage transformer 3 to the direction away from the high-voltage generator 3, which is consistent with the direction of the spatial electric field gradient, and reduces the chance of them discharging with surrounding components. Combined with appropriate insulation and shielding measures, the present invention can ultimately achieve normal operation of the grid-controlled combined head in a very compact space.

[0009] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that any modification or equivalent replacement of the technical solution of the present invention without departing from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An X-ray combined head with grid control capability, comprising a housing, an X-ray tube, a high-voltage transformer, a voltage-doubler rectifier positive-pressure module, a voltage-doubler rectifier negative-pressure module, a filament and grid control module, a power supply, an insulating fixing plate, etc., characterized in that: The x-ray tube, high-voltage transformer, voltage-doubler rectifier positive-voltage module, voltage-doubler rectifier negative-voltage module, filament and grid control module, power supply, and insulating fixing plate are all placed inside the shell, and the shell is filled with insulating oil or other insulating materials. Among them, an insulating fixing plate is arranged on a side surface along the axis of the x-ray tube, and the high-voltage transformer, the voltage-doubler rectifier positive-voltage module and the voltage-doubler rectifier negative-voltage module are arranged on the insulating fixing plate, wherein the voltage-doubler rectifier positive-voltage module is close to the anode of the x-ray tube, the voltage-doubler rectifier negative-voltage module is close to the cathode of the x-ray tube, and the high-voltage transformer is between the voltage-doubler rectifier positive-voltage module and the voltage-doubler rectifier negative-voltage module. An insulating fixing plate is arranged at the cathode end of the x-ray tube, and the filament and grid control module and power supply are arranged on the insulating fixing plate at the cathode end of the x-ray tube.

2. The X-ray combined head according to claim 1, characterized in that: The filament and grid control module and power supply are provided with a low-voltage DC power supply, a filament control module and a grid control module.

3. The X-ray combined head according to claim 1, characterized in that: The lowest voltage multiplication levels of the voltage doubler rectifier positive voltage module and the voltage doubler rectifier negative voltage module are both close to the high-voltage transformer, and the voltage multiplication levels increase in sequence in the direction away from the high-voltage transformer.

4. The X-ray combined head according to claim 1 and claim 2, characterized in that: The secondary of the high-voltage transformer is connected to the input ends of the voltage-doubling rectifier positive-voltage module and the voltage-doubling rectifier negative-voltage module, the output end of the voltage-doubling rectifier positive-voltage module is connected to the anode of the x-ray tube, the output end of the voltage-doubling rectifier negative-voltage module is connected to the cathode of the x-ray tube, and is also connected to the common end of the low-voltage DC power supply, the filament control module and the grid control module; the outputs of the filament control module and the grid control module are respectively connected to the filament and the grid of the x-ray tube.

5. The X-ray combined head according to claim 2 and claim 4, characterized in that: The exterior of the filament control module and the grid control module are shielded by a metal sheet, and a wire is led out from the metal sheet to be connected to the output end of the voltage-doubling rectifier negative pressure module or the cathode of the X-ray tube.

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