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-controlled 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 a combined head, while ensuring a safe distance between the high-voltage potentials inside the combined head and avoiding pressure and interference from 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, comprising 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 the power supply 5, the insulating fixing plates 6.1 and 6.2 are all placed inside the housing 1, and the housing 1 is filled with insulating oil or other insulating materials. Among them, the X-ray tube 2 is located at one end of the housing, and an insulating fixing plate 6.1 is provided on the anode side of the X-ray tube 2, extending to the other end of the housing 1 space away from the X-ray tube 2, and an insulating fixing plate 6.2 is provided on the cathode side of the X-ray tube 2, extending to the other end of the housing 1 space away from the X-ray tube 2. The outer side of the insulating fixed plate 6.1 is the voltage doubler rectifier positive pressure module 4.1, the outer side of the insulating fixed plate 6.2 is the voltage doubler rectifier negative pressure module 4.2, between the two insulating fixed plates 6.1 and 6.2, close to the x-ray tube 2 and biased towards the cathode side of the x-ray tube 2 are the filament and grid control module and the power supply 5, and the high-voltage transformer 3 is arranged between the two insulating fixed plates 6.1 and 6.2 and away from the x-ray tube 2.

[0005] Furthermore, a low-voltage DC power supply, a filament control module and a grid control module are provided on the filament and grid control module and the power supply 5. The arrangement of the voltage doubler circuits of the voltage doubler rectifier positive voltage module 4.1 and the voltage doubler rectifier negative voltage module 4.2 is as follows: the highest voltage doubler end, that is, the output end, is close to the x-ray tube 2, wherein the output end of the voltage doubler rectifier positive voltage module 4.1 is close to the anode of the x-ray tube 2, and the output end of the voltage doubler rectifier negative voltage module 4.2 is close to the cathode of the x-ray tube 2. Whether it is the voltage doubler rectifier positive voltage module 4.1 or the voltage doubler rectifier negative voltage module 4.2, the voltage doubler circuit has a lower voltage doubler level the farther away from the x-ray tube 2, until the farthest end is the input end of the voltage doubler circuit.

[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 position close to the x-ray tube 2 is at high voltage and the position far away from the x-ray tube 2 is at low voltage. At the same time, 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. In this way, the high-voltage transformer 3 itself is low voltage, and its position is just in the low-voltage area far away from the x-ray tube, which increases its insulation distance from high-voltage components such as the x-ray tube 2 and the high-voltage ends of the voltage-doubling rectifier positive-voltage module 4.1 and the voltage-doubling rectifier negative-voltage module 4.2. The basic potential of the filament, the 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 beneficial to increase its insulation distance from 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 multiplication levels of the voltage multiplication rectifier positive pressure module 4.1 and the voltage multiplication rectifier negative pressure module 4.2 decrease step by step from the position close to the x-ray tube 2 to the direction away from the x-ray tube 2, which is consistent with the direction of the spatial electric field gradient, reducing 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural diagram of a grid-controlled X-ray combined head of the present invention, and the numbers in the figure are as follows: shell 1, X-ray tube 2, high-voltage transformer 3, voltage-doubler rectifier positive pressure module 4.1, voltage-doubler rectifier negative pressure module 4.2, filament and grid control module and power supply 5, insulating fixing plate 6.1, insulating fixing plate 6.2.

Claims

1. An X-ray combined head with grid control capability, including a housing, an X-ray tube, a high-voltage transformer, a voltage-doubler rectifier positive voltage module, a voltage-doubler rectifier negative voltage module, a filament and grid control module, a power supply, an insulating fixing plate, etc. Features: The x-ray tube, high-voltage transformer, voltage-doubling rectifier positive-voltage module, voltage-doubling rectifier negative-voltage module, filament and grid control module, power supply, and insulating fixed plate are all placed inside the shell, and the shell is filled with insulating oil or other insulating materials. The x-ray tube is at one end inside the shell, and there is an insulating fixed plate on the anode and cathode sides of the x-ray tube, respectively, extending to the other end of the shell. The voltage-doubling rectifier positive-voltage module is located on the outside of the insulating fixed plate on the anode side of the x-ray tube, the voltage-doubling rectifier negative-voltage module is located on the outside of the insulating fixed plate on the cathode side of the x-ray tube, the filament and grid control module and power supply are located between the two insulating fixed plates, close to the x-ray tube and biased toward the cathode side of the x-ray tube, and the high-voltage transformer is located between the two insulating fixed plates and away from the x-ray tube.

2. The X-ray combined head according to claim 1, Features: 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, It is characterized in that The highest voltage multiplication levels of the voltage-doubling and rectifying positive-pressure module and the voltage-doubling and rectifying negative-pressure module are both located at one end of the x-ray tube, and the voltage multiplication levels decrease in sequence in the direction away from the x-ray tube.

4. The X-ray combined head according to claim 1 and claim 2, Features: 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, Features: 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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