CN213483700U

CN213483700U - Anode assembly with two-end absorber

Info

Publication number: CN213483700U
Application number: CN202023200766.4U
Authority: CN
Inventors: 王颂东; 于山
Original assignee: Strahlkraft Medical Technology Suzhou Co ltd
Current assignee: Strahlkraft Medical Technology Suzhou Co ltd
Priority date: 2020-12-26
Filing date: 2020-12-26
Publication date: 2021-06-18
Anticipated expiration: 2030-12-26

Abstract

The utility model discloses an anode assembly with both ends absorber, including first bearing and second bearing, first bearing with the second bearing is the liquid metal bearing, first bearing with the second bearing includes common axostylus axostyle and cladding and is in the axle sleeve of axostylus axostyle periphery, the both ends of axostylus axostyle all are connected with the absorber, the absorber is the cylinder, its with the axostylus axostyle adopts high temperature to braze sealedly. The utility model has an anode component with absorbers at two ends, and the absorbers are connected at two ends of the shaft lever, which can effectively absorb the residual liquid metal and ensure that the liquid metal bearing can not leak liquid; the absorber is cylindrical and is sealed with the shaft rod by high-temperature brazing, so that the coaxiality of the absorber and the shaft rod is ensured, and the liquid metal is fully ensured not to leak into the vacuum environment of the X-ray tube.

Description

Anode assembly with two-end absorber

Technical Field

The utility model relates to a medical detection and ray measurement detect technical field, especially relate to an anode assembly with both ends absorber.

Background

The X-ray tube is mainly used for medical equipment such as an X-ray machine, a CT machine and the like, and generates X-rays under the action of external high pressure, so that doctors can diagnose or treat patients.

Filament electron cloud of the X-ray tube is accelerated to strike an anode target plate under the action of negative high voltage of a cathode and positive high voltage of an anode to generate X-rays, effective X-rays are output by a ray window, but only 1% of the effective X-rays are generated, and the rest 99% of energy is completely converted into heat which is transmitted to the outside of the X-ray tube through different channels and is taken away by an X-ray tube sleeve and an X-ray tube radiator. Traditional X-ray tube mainly adopts ball bearing structure, and its heat dissipation channel includes:

1. the heat of the target disk (90% of the total heat) is partly radiated to the metal envelope, partly radiated to the outside of the X-ray tube through the glass envelope at the anode, and partly taken away through the rotor copper sleeve and the ball bearings. The heat radiated to the metal shell is about 60% at the maximum, the heat radiated through the glass is about 20%, and the heat taken away through the rotor copper sleeve is about 20%.

2. The heat of the cathode (10% of the total heat) is carried away through the cathode glass and the metal shell.

According to the X-ray tube adopting the ball bearing structure, the anode high voltage is connected with the target disc through the threads on the ball bearing, the heat capacity of the anode can only be 3.5MHU or below, and the X-ray tube is not suitable for the X-ray tube with the heat capacity of 5MHU or above.

There is therefore a need to provide a new anode assembly with a two-terminal absorber that solves some of the problems of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adaptation is used for 7.5MHU and above big thermal capacity's positive pole subassembly with both ends absorber.

In order to achieve the above object, the utility model discloses a technical scheme be: an anode assembly with absorbers at two ends comprises a first bearing and a second bearing, wherein the first bearing and the second bearing are both liquid metal bearings, the first bearing and the second bearing comprise a common shaft rod and a shaft sleeve covering the periphery of the shaft rod, a shaft rod groove is formed in the shaft rod, the first bearing and the second bearing are limited by the shaft rod groove, a gap is formed between the shaft rod and the shaft sleeve, the liquid metal can move along the gap, the absorbers are connected to two ends of the shaft rod, are cylindrical, and are sealed with the shaft rod through high-temperature brazing.

The absorber is made of iron oxide or molybdenum.

The surface of the absorber is coated with a coating, and the coating is silver, titanium and nickel.

The shaft lever is a hollow shaft lever, a first fixing sleeve and a second fixing sleeve are connected to two ends of the shaft lever respectively, a first cavity and a second cavity communicated with the inside of the shaft lever are arranged in the first fixing sleeve and the second fixing sleeve respectively, a cooling liquid outlet is formed in the first cavity, and a cooling liquid injection port is formed in the second cavity.

The end, close to the first fixed sleeve, of the shaft rod is coated with a first throttler, the first throttler is located between the shaft rod and the shaft sleeve, and the first throttler comprises a plurality of first open hollow grooves uniformly coated on the outer wall of the shaft rod.

One end of the shaft lever close to the second fixing sleeve is coated with a second throttler, and the second throttler comprises a plurality of second opening hollow grooves with different sizes.

The outer surface of the shaft rod and the inner surface of the shaft sleeve are coated with iron oxide or molybdenum.

Compared with the prior art, the utility model discloses positive pole subassembly with both ends absorber's beneficial effect lies in: the two ends of the shaft lever are connected with the absorbers, so that residual liquid metal can be effectively absorbed, and the liquid metal bearing is prevented from leaking liquid; the absorber is cylindrical and is sealed with the shaft rod by high-temperature brazing, so that the coaxiality of the absorber and the shaft rod is ensured, and the liquid metal is fully ensured not to leak into the vacuum environment of the X-ray tube.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

FIG. 1 is a schematic view of a medical X-ray tube with a bearing structure at two ends according to the present invention;

FIG. 2 is a schematic view of an anode assembly of the present invention;

FIG. 3 is a schematic view of the shaft of the present invention;

FIG. 4 is a partial schematic view of an anode assembly of the present invention;

FIG. 5 is another partial schematic view of an anode assembly of the present invention;

fig. 6 is a further partial schematic view of an anode assembly of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 to 6, the present invention relates to a medical X-ray tube with a bearing structure at two ends, which includes a metal casing 10, an anode assembly 20 and a cathode assembly 30 housed in the metal casing 10, wherein the metal casing 10 and the anode assembly 20 are grounded. The metal housing 10 and the anode assembly 20 are grounded so that during operation of the X-ray tube the anode is at zero potential, allowing heat from the anode to be cooled by an extremely efficient coolant or water.

Referring to fig. 1, an output window soldering socket 40 is connected to the metal housing 10, a radiation output window 50 is soldered to the output window soldering socket 40, and X-rays are emitted from the radiation output window 50.

Referring to fig. 1 and 2, the anode assembly 20 includes an anode target disk 21 accommodated in the metal casing 10, and a first bearing 22 and a second bearing 23 penetrating the inside of the anode target disk 21, wherein the first bearing 22 and the second bearing 23 are both liquid metal bearings, and the center of mass of the anode target disk 21 is located between the first bearing 22 and the second bearing 23. The stress ends of the two bearings are respectively positioned at the two ends of the anode target disk 21, and compared with the traditional X-ray tube with the bearing positioned at one end of the anode target disk, the stress of the X-ray tube is balanced, and the reliability of the X-ray tube is ensured. In a conventional positive and negative high voltage X-ray tube, the liquid metal bearing is located at only one end of the anode target disk for insulation, but the metal housing 10 and the anode assembly 20 of the X-ray tube are grounded, and the anode is at zero potential during operation of the X-ray tube, so that the anode target disk 21 can be located between the two liquid metal bearings.

Referring to fig. 2 and 5, the first bearing 22 and the second bearing 23 include a common shaft 24 and a shaft sleeve 25 covering the outer periphery of the shaft 24, the shaft sleeve 25 penetrates the anode target disk 21, a shaft groove 26 is formed on the shaft 24, the first bearing 22 and the second bearing 23 are limited by the shaft groove 26, a gap (not shown) is formed between the shaft 24 and the shaft sleeve 25, and the liquid metal can move along the gap. The gap is sized to ensure a precise fit between the shaft 24 and the sleeve 25 without affecting bearing rotation or allowing liquid metal to leak through the gap. When the shaft sleeve 25 rotates, the liquid metal forms a layer of liquid metal film between the shaft rod 24 and the shaft sleeve 25 through the structure, and the layer of liquid metal film prevents abrasion between the shaft rod 24 and the shaft sleeve 25 which rotate oppositely, so that the long-time work of the bearing is ensured. The outer surface of the shaft rod 24 and the inner surface of the shaft sleeve 25 are coated with iron oxide or molybdenum and the like, and the iron oxide or molybdenum has good wettability to liquid metal.

Referring to fig. 2, the shaft rod 24 is a hollow shaft rod, two ends of the hollow shaft rod are respectively connected with a first fixing sleeve 27 and a second fixing sleeve 28, a first cavity 271 and a second cavity 281 communicated with the inside of the shaft rod 24 are respectively arranged in the first fixing sleeve 27 and the second fixing sleeve 28, a coolant outlet 272 is arranged at the first cavity 271, and a coolant inlet 282 is arranged at the second cavity 281, when the X-ray tube is assembled to the tube sleeve, the coolant in the tube sleeve can directly pass through the whole shaft rod 24 through the coolant inlet 282 and flow out from the coolant outlet 272, so that the heat of the shaft rod 24 can be rapidly taken away; and the cooling liquid can circulate in the passage, thereby improving the anode heat capacity of the X-ray tube and realizing no waiting time of the CT machine during the examination.

Referring to fig. 2, 4 and 6, one end of the shaft 24 close to the first fixing sleeve 27 is coated with a first restrictor 60, the first restrictor 60 is located between the shaft 24 and the shaft sleeve 25 to prevent liquid metal in a gap between the shaft 24 and the shaft sleeve 25 from overflowing into a vacuum environment of the X-ray tube, the first restrictor 60 includes a plurality of first open hollow grooves 61 uniformly coated on an outer wall of the shaft 24, and specifically, the number of the first open hollow grooves 61 is set to be 3. The end of the shaft 24 near the second pouch 28 is covered with a second restrictor 70 to further prevent liquid metal from escaping into the vacuum environment of the X-ray tube, ensuring the life of the X-ray tube. The second throttle device 70 includes a plurality of second open hollow grooves 71 having different sizes, and specifically, the number of the second open hollow grooves 71 is two. The design of the first 60 and second 70 chokes is sufficient to ensure that liquid metal does not leak into the vacuum environment of the X-ray tube.

Referring to fig. 2 and 4, the absorber 80 is connected to both ends of the shaft 24, the absorber 80 is cylindrical and sealed with the shaft 24 by high temperature brazing, and the absorber 80 can leak residual liquid metal to prevent the liquid metal from escaping into the vacuum environment of the X-ray tube. The absorber 80 is made of a metal having high wettability with liquid metal, such as iron oxide, molybdenum, etc. The surface of the absorber 80 is coated with a coating made of silver, titanium, nickel, etc., and the coating can chemically react with the liquid metal, so as to absorb the liquid metal.

Referring to fig. 3, a first groove 241 and a second groove 242 are disposed on an outer wall of the shaft 24, flow guiding grooves 243 uniformly distributed are disposed between the first groove 241 and the second groove 242 and between the second groove 242 and an end of the shaft 24, the flow guiding grooves 243 include a pair of inclined grooves 244 which are mirror symmetric, a plurality of circular grooves 245 connected between the pair of inclined grooves 244, and a straight groove 246 connected between two adjacent circular grooves 245, and the inclined grooves 244 are communicated with the first groove 241 or the second groove 242. When the shaft sleeve 25 rotates, the liquid metal flows from the first groove 241 to the second groove 242 along the inclined groove 244 and the circular groove 245, then flows to the end of the shaft 24 along the inclined groove 244 and the circular groove 245 again, and finally moves reversely along the gap between the shaft 24 and the shaft sleeve 25. Specifically, the circular grooves 245 are provided in 3. The outer wall of the shaft 24 is provided with 3 circular grooves 245, the 3 circular grooves 245 are connected by a straight groove 246, and the two sides of the straight groove are connected with angled inclined grooves 244, so that the fluency and the orderliness of the liquid metal moving along the shaft 24 are increased.

Referring to fig. 1, the cathode assembly 30 includes a cathode ceramic 31, a cathode focus cap 32 connected to an end of the cathode ceramic 31, and a cathode absorption electrode 33 coated outside the cathode focus cap 32. By adopting the cathode ceramic 31, the heat resistance and the anti-creeping capacity of the X-ray tube can be effectively improved, and the reliability of the X-ray tube is improved.

The utility model has an anode component with absorbers at two ends, and the absorbers are connected at two ends of the shaft lever, which can effectively absorb the residual liquid metal and ensure that the liquid metal bearing can not leak liquid; the absorber is cylindrical and is sealed with the shaft rod by high-temperature brazing, so that the coaxiality of the absorber and the shaft rod is ensured, and the liquid metal is fully ensured not to leak into the vacuum environment of the X-ray tube.

Of course, those skilled in the art should realize that the above-mentioned embodiments are only used for illustrating the present invention, and not for limiting the present invention, and that the changes and modifications to the above-mentioned embodiments are all within the scope of the appended claims as long as they are within the true spirit of the present invention.

Claims

1. An anode assembly having a two-terminal absorber, characterized by: the bearing comprises a first bearing and a second bearing, wherein the first bearing and the second bearing are both liquid metal bearings, the first bearing and the second bearing comprise a common shaft rod and a shaft sleeve covering the periphery of the shaft rod, a shaft rod groove is formed in the shaft rod, the first bearing and the second bearing are limited by the shaft rod groove, a gap is formed between the shaft rod and the shaft sleeve, the liquid metal can move along the gap, two ends of the shaft rod are both connected with absorbers, the absorbers are cylindrical, and the absorbers and the shaft rod are sealed by high-temperature brazing.

2. An anode assembly having a two-terminal absorber as claimed in claim 1, wherein: the absorber is made of iron oxide or molybdenum.

3. An anode assembly having a two-terminal absorber as claimed in claim 2, wherein: the surface of the absorber is coated with a coating, and the coating is silver, titanium and nickel.

4. An anode assembly having a two-terminal absorber as claimed in claim 1, wherein: the shaft lever is a hollow shaft lever, a first fixing sleeve and a second fixing sleeve are connected to two ends of the shaft lever respectively, a first cavity and a second cavity communicated with the inside of the shaft lever are arranged in the first fixing sleeve and the second fixing sleeve respectively, a cooling liquid outlet is formed in the first cavity, and a cooling liquid injection port is formed in the second cavity.

5. An anode assembly having a two-terminal absorber as claimed in claim 4, wherein: the end, close to the first fixed sleeve, of the shaft rod is coated with a first throttler, the first throttler is located between the shaft rod and the shaft sleeve, and the first throttler comprises a plurality of first open hollow grooves uniformly coated on the outer wall of the shaft rod.

6. An anode assembly having a two-terminal absorber as claimed in claim 5, wherein: one end of the shaft lever close to the second fixing sleeve is coated with a second throttler, and the second throttler comprises a plurality of second opening hollow grooves with different sizes.

7. An anode assembly having a two-terminal absorber as claimed in any one of claims 1 to 6, wherein: the outer surface of the shaft rod and the inner surface of the shaft sleeve are coated with iron oxide or molybdenum.