JPH10189285A - X-ray tube device for medical use - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray tube device for medical use in which flow of insulating oil can be improved even in a place in an X-ray tube container where sufficient flow of the oil cannot be obtained for preventing deterioration of the insulating oil or generation of carbide, and preventing deterioration of withstand voltage performance of the X-ray tube device. SOLUTION: A stator 2 is driven to rotate a positive electrode, a voltage is applied to an X-ray tubular bulb 1, so X-ray is generated, when mass quantity of heat is generated. In the meanwhile, insulation oil is circulated along flow illustrated with arrows. The insulation oil flows from an external heat exchanger or the like into an X-ray tubular bulb container 5 through a hose 6. The insulating oil advances along the hose 6 to reach a nozzle 7, when the insulating oil is strongly injected from a tip of the nozzle 7. The injected insulating oil flows out to be branched to six branched flow passages 8, and after it reaches a tip part of each flow passage, it is jetted to a gap between the X-ray tubular bulb 1 and an electric insulation die 3, thereby stay of the insulation oil can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an X-ray tube apparatus used in the medical field.

[0002]

2. Description of the Related Art In an X-ray tube apparatus used for medical diagnosis and medical imaging, 99% is converted into thermal energy when X-rays are generated.
000-1200 ° C., and the temperature inside the X-ray tube container rises. To prevent this temperature rise, the X-ray tube container is filled with insulating oil having excellent heat conductivity.

However, when the load on the X-ray tube apparatus increases and the suppression of temperature rise is not sufficient only by heat conduction inside the X-ray tube container, an air-cooled or water-cooled heat exchanger is provided outside the X-ray tube container. To forcibly cool the insulating oil in the X-ray tube container from the outside.

[0004] For example, as shown in FIG.
X-ray tube 21 for generating X-rays, stator 22 for anode rotation of X-ray tube 21, electric insulating mold 23, insulating oil 24, X-ray tube container 25, hose 2 guided from heat exchanger
The insulating oil discharged from the external heat exchanger flows into the X-ray tube container 25 through the hose 26 and flows from the anode side to the cathode side of the X-ray tube 21. After cooling the inside of the X-ray tube container and cooling the insulating oil that has been recovered in the heat exchanger from the predetermined outlet in the X-ray tube container and has increased in temperature, it is again guided into the X-ray tube container via the hose 26. It has become.

[0005]

The insulating oil 24
Flows into the gap between the X-ray tube 21 and the insulating mold 23 from the small hole of the insulating mold 23, but since the flow path is narrower and the conductance is smaller than other places where the insulating oil flows, Sufficient flow cannot be obtained.

For this reason, the temperature of the insulating oil abnormally rises in a portion where the flow rate of the insulating oil is small, such as the portion a, causing the deterioration of the insulating oil and the generation of carbides, thereby reducing the withstand voltage performance of the X-ray tube device. Deterioration was caused.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and improves the flow of insulating oil even in a place where a sufficient flow rate of insulating oil cannot be obtained in an X-ray tube container. It is intended to provide a medical X-ray tube device that prevents deterioration of the X-ray tube and generation of carbides and does not deteriorate the withstand voltage performance of the X-ray tube device.

[0008]

In order to achieve the above object, a medical X-ray tube apparatus according to the present invention uses an insulating oil filled in an X-ray tube container with heat exchange provided outside the X-ray tube container. In a medical X-ray tube device that cools the inside of the X-ray tube container by circulating it with a heater, a nozzle is provided near the place where the flow of insulating oil in the X-ray tube container is poor, and the nozzle is insulated from the external heat exchanger It is characterized by direct delivery of oil.

[0009] The insulating oil cooled by the external heat exchanger flows into the X-ray tube vessel in which the X-ray tube is present. Since it is directly fed to the nozzle provided in the vicinity, the insulating oil that has flowed out of the nozzle and whose flow velocity has been accelerated can increase the flow velocity and flow rate of the insulating oil in the place where the flow is poor, thereby increasing the cooling efficiency. it can.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of a medical X-ray tube apparatus according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG.

1 is an X-ray tube for generating X-rays,
a is an anode in the X-ray tube, 2 is a stator for rotating the anode 1a, 3 is an electric insulating mold for insulating the stator from high voltage applied to the X-ray tube, and 4 is a filling in the container. Insulated oil, 5 is an X-ray tube container, 6 is a hose guided from an external heat exchanger or the like, and 7 is a nozzle attached to the tip of a hose 6 inserted into the inside of the X-ray tube container.

The nozzle 7 is attached to the right end of the electric insulating mold 3. Inside the electric insulating mold 3, there is formed a flow passage 8 branched so that the insulating oil jetted from the tip of the nozzle 7 can pass through. Is formed. As shown in FIG. 2, six flow paths 8 are formed, and insulating oil 4 is ejected from a tip of the flow path into a gap between the X-ray tube 1 and the electrically insulating mold 3. It has become.

When the stator 2 is driven and the anode 1a rotates,
When a voltage is applied to the X-ray tube 1 to generate X-rays, a large amount of heat is generated at this time.

On the other hand, the insulating oil circulates along the flow indicated by the arrow. X from insulating heat exchanger, etc. via hose 6
It flows into the inside of the wire tube container 5. The insulating oil travels along the hose 6 and reaches the nozzle 7 where the insulating oil jumps out from the tip of the nozzle 7.

The insulating oil which has flowed out is divided into six branched flow paths 8 and flows out. After reaching the tips of these flow paths, the insulating oil flows between the X-ray tube 1 and the electric insulating mold 3. Squirt into the gap.

Further, after the insulating oil moves along the outside of the X-ray tube 1, the insulating oil is recovered from a predetermined outlet of the X-ray tube vessel 5 in the above-mentioned heat exchanger and absorbed to reduce the temperature. After that, it is sent again from the hose 6 to the nozzle in the X-ray tube container 5 and circulates.

The insulating oil 4 thus sent flows vigorously even in a narrow place such as a gap between the X-ray tube 1 and the electric insulating mold 3, so that the insulating oil 4 Since stagnation can be eliminated, an abnormal rise in the temperature of the insulating oil can be prevented, and deterioration and carbonization of the insulating oil can be prevented.

As shown in FIG. 3, when the insulating oil near the X-ray tube radiating port is severely stagnant and the temperature of the insulating oil rises greatly, the position of the nozzle 7 is set as shown in FIG. The accelerated insulating oil may be sent to the vicinity of the tube outlet.

[0020]

As described above, according to the present invention,
A nozzle is installed near the place where the flow of insulating oil is poor in the X-ray tube container, and the cooled insulating oil is directly sent from the external heat exchanger to the nozzle, and the insulating oil is forcibly circulated. As a result, stagnation of insulating oil can be prevented, and a rise in temperature can be suppressed.

Therefore, the deterioration of the insulating oil and the generation of carbides can be suppressed, and the deterioration of the withstand voltage performance can be prevented, so that the life of the X-ray tube device can be extended.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a medical X-ray tube apparatus of the present invention.

FIG. 2 is a diagram showing a configuration of a cross section taken along line AA of FIG. 1;

FIG. 3 is a diagram showing the configuration of another embodiment of the medical X-ray tube apparatus of the present invention.

FIG. 4 is a diagram showing a configuration of a conventional medical X-ray tube device.

Claims (1)

[Claims] 1. An insulating oil filled in an X-ray tube container is circulated by a heat exchanger provided outside the X-ray tube container.
In a medical X-ray tube apparatus that cools the inside of a X-ray tube container, a nozzle is provided near a place where the flow of insulating oil is poor in the X-ray tube container, and the insulating oil is directly sent from the external heat exchanger to the nozzle. A medical X-ray tube device that was characterized.