Liquid metal bearing medical X-ray tube

Abstract

The invention discloses a liquid metal bearing medical X-ray tube which comprises a metal shell, an anode shell, a cathode shell, a liquid metal bearing and a hollow target disc, the liquid metal bearing comprises a shaft rod, a shaft sleeve and a shaft sleeve sealing ring, the shaft rod is a hollow shaft rod, a cavity is formed in the shaft sleeve sealing ring, and a cooling oil injection port isformed in the cavity. According to the invention, the liquid metal bearing is adopted, almost no wear is caused during rotation, and heat can be quickly transferred to the outside of the tube throughthe liquid metal bearing, so that the heat dissipation capability of the hollow target disc is effectively improved, the reliability of the bearing is improved, the reliability of the X-ray tube is improved, and the anode heat capacity of the X-ray tube can reach 5MHU or above; and the shaft rod is a hollow shaft rod, when the X-ray tube is assembled to the tube sleeve, cooling oil of the tube sleeve can be directly introduced into the topmost portion of the shaft rod, and it is guaranteed that heat of the shaft rod can be rapidly taken away. Both the anode shell and the cathode shell adopt corrugated ceramic structures, so that the surface area of the ceramic is increased, and heat can be dissipated in time.

Description

technical field [0001] The invention relates to the technical field of medical detection and ray measurement detection, in particular to a liquid metal bearing medical X-ray tube. Background technique [0002] X-ray tubes are mainly used in medical equipment such as X-ray machines and CT machines. Under the action of external high pressure, X-rays are generated for doctors to diagnose or treat patients. [0003] The filament electron cloud of the X-ray tube accelerates to the anode target disk under the negative high voltage of the cathode and the positive high voltage of the anode to generate X-rays, and the effective X-rays are output from the ray window, but only 1% of the effective X-rays are produced, and the rest 99% of the energy is converted into heat, which is transmitted to the outside of the X-ray tube through different channels, and is taken away by the X-ray tube sleeve and the X-ray tube radiator. The traditional X-ray tube mainly adopts ball bearing structure...

AI Technical Summary

Problems solved by technology

[0006] This kind of X-ray tube adopts ball bearing structure. The anode high voltage is connected to the target plate through the thread on the ball bearing. The anode heat capacity can only be 3.5MHU and below, which is not suitable for X-ray tubes with large heat capacity of 5MHU and above. The following disadvantages:

[0008] 2. The cooling efficiency of bearings with this structure is extremely low, and the requirements for bearing materials are very high;

[0009] 3. The shaft temperature of this structure is very high, resulting in a large temperature difference between the inner and outer rings of the bearing, and the bearing life is low;

[0010] 4. The bearing balls of this structure will be worn and the service life is limited

[0012] 1. When the target plate is working at a high temperature of 1100 degrees, the heat will be transferred to the iron seat through the molybdenum rod and then directly transmitted to the shaft, while the shaft can only be transmitted from the ball to the outer ring of the bearing through heat conduction, and then from the outer ring to the shaft sleeve. The above is carried away by the insulating oil, and the path is very long;

[0013] 2. Since the heat of the target plate of this structure is quickly transferred to the shaft, but the maximum working temperature of the shaft is only 550 degrees, the shaft flange is generally made of materials with extremely low thermal conductivity, and the bearing cost is high;

[0014] 3. Since the shaft works at about 500 degrees for a long time, this requires that the working temperature of the outer ring of the bearing should not be lower than 350 degrees (the temperature difference between the inner and outer bearings of this kind of centripetal thrust structure is not allowed to exceed 150 degrees, otherwise the inner and outer raceways of the bearing are easily deformed and cause card shaft), and often the temperature of the outer ring of the bearing can only work around 350, resulting in a decrease in bearing life

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