CN208548335U - A kind of high heat dissipation medical X-ray tube of internal cooling ball bearing - Google Patents

Abstract

The utility model discloses a kind of high heat dissipation medical X-ray tubes of internal cooling ball bearing, belong to medical detection and ray metering detection technique field, including target disc, support ring, rotor molybdenum bar, rotor copper sheathing, rotor iron seat, anode corrugations ceramics and hollow bearing.The utility model gives the high heat dissipation medical X-ray tube of the cooling ball bearing in inside of a kind of hollow target disc of combination, hollow bearing system, anode corrugations ceramic structure and new target disc fixed form, to realize the solution of the big thermal capacity X-ray tube of 5MHU or more；Wherein, the structure design of hollow target disc, the heat of target disc are directly conducted heat on rotor copper sheathing by cavity；The design of hollow shaft sleeve, cooling oil can direct cool to inside axle sleeve；The design of anode corrugations ceramics, the heat of rotor copper sheathing is radiation-curable on anode ripple ceramic, then through anode corrugations ceramic conductive into cooling oil；The design of new anode disc fixed form, improves the reliability of high-speed rotation.

Description

A kind of high heat dissipation medical X-ray tube of internal cooling ball bearing

Technical field

The utility model belongs to medical detection and ray metering detection technique field, in particular to a kind of internal cooling ball The high heat dissipation medical X-ray tube of bearing.

Background technique

X-ray tube is mainly used on the Medical Devices such as X-ray production apparatus, CT machine, in the case where applying external high pressure effect, generates X and penetrates Line is diagnosed or is treated to patient for doctor.

X-ray tube generates the mechanism of X-ray approximately as: the filament (cathode) of X-ray tube in a heated state, freely Electronics escapes filament surface, forms electron cloud.Apply (generally 40 ~ 150 under high-voltage case between X-ray tube cathode, anode Kilovolt), the electronics high speed at filament is flown to target disc (anode), generates X-ray after hitting anode disc, and defeated by ray window Effective X-ray out.It has been observed that only 1% electronic kinetic energy is converted into X-ray in this energy conversion process, residue 99% is moved It can be converted into thermal energy, by heat radiation or heat transfer, reached outside X-ray tube, by X-ray tube pipe sleeve and X-ray tube radiator band It walks.Specifically, comprising: (1) heat (account for total amount of heat 90%) a part of target disc is radiated the metal-back in the middle part of X-ray tube On, another part is radiated outside X-ray tube through both ends glass bulb or other materials, and last part is taken away by rotor copper sheathing. The heat maximum for being wherein radiated metal-back accounts for about 60%, through the heat about 20% of glass radiation, is taken away by rotor copper sheathing Heat about 20%.(2) heat (accounting for total amount of heat 10%) of cathode is taken away by cathode glass and metal-back.

In use, X-ray tube only has 1% energy to be converted into X-ray, remaining 99% is converted into thermal energy, it is necessary into Row rapid cooling.Therefore, the thermal management of X-ray tube is to influence one of its reliability and the key factor in service life.

As shown in figure 5, under prior art, since the temperature at work of target disc can reach 1000 degree or more, heat The temperature of amount conduction to ball bearing shaft has 500 degree or more, and shaft can only be transferred heat in insulating oil by axle sleeve, cause to dissipate The thermal efficiency is very low.

In the prior art, X-ray tube has the drawback that in radiation processes

1, anode thermal capacity is limited；

2, bearing material is required high；

3, bearing life is limited；

4, in target disc high-speed rotation, fixed positional shift and the risk height that falls off occurs.

The reason of leading to conclusions, is as follows:

1, in existing X-ray tube design, high pressure generator anode is connected by the screw thread on ball bearing with target disc, the knot Structure limits the radiating efficiency of ball bearing；Meanwhile target disc can reach 1100 degree of high temperature when working, heat passes through molybdenum rod conduction To iron seat, then shaft is arrived, is then conducted again by ball to bearing outer ring, outer ring is conducted to axle sleeve, is taken away by insulating oil.Thus may be used See, the path of heat conducting and radiating is very long.And constraints above condition, cause anode thermal capacity can only accomplish 3.5MHU and hereinafter, Be not suitable for the X-ray tube of the big thermal capacity of 5MHU or more；

2, in existing X-ray tube design, the heat of target disc is conducted to shaft, but the maximum operating temperature that shaft allows is not high In 550 degree, so the material that manufacture shaft ring flange generally uses pyroconductivity extremely low, so bearing mnanufacture cost is very high；

3, since shaft long-term work is at 500 degree or so, this requires the operating temperatures of bearing outer ring cannot be below 350 degree (note: this kind of centripetal thrust force airframe bearing internal-external temperature difference does not allow more than 150 degree, and otherwise bearing internal external raceway is easily-deformable leads to card Axis), and often the temperature of bearing outer ring can only meet most basic temperature requirement (maintaining 350 ° or so), cause under bearing life Drop；

4, in existing X-ray tube design, target disc fixed form is that single thread fixed form specific structure is shown in Fig. 1, due to sun Pole target disc at work revolving speed reach 10800 RPM, which results under high speed operation state screw thread be possible to loosen, mesh Preceding solution is: (1) target disc and rotor copper sheathing are fixed using single thread, subsequent using 1600 DEG C of high-temperature solder welding, should Scheme is with high costs, need to put into electron beam welding equipment；(2) target disc and rotor copper sheathing are fixed using molybdenum nut, molybdenum nut and rotor Copper sheathing uses machine riveting, and program poor reliability, target disc falls off when being easy to cause high speed rotation, there is security risk；(3) target Disk and rotor copper sheathing are fixed using molybdenum nut, are connected between molybdenum nut and rotor copper sheathing by tantalum gasket, and which increases cost And loosening is had when high speed rotation, influence picture quality.

Utility model content

Purpose of utility model: in order to overcome the above deficiency, the purpose of the utility model is to provide a kind of internal cooling balls The high heat dissipation medical X-ray tube of bearing, solves the problems, such as X-ray tube heat dissipation.

Technical solution: a kind of high heat dissipation medical X-ray tube of internal cooling ball bearing, including target disc, support ring, rotor Molybdenum bar, rotor copper sheathing, rotor iron seat, anode corrugations ceramics and hollow bearing, the target disc are connect with support ring, the support ring It being connect with rotor molybdenum bar, the rotor molybdenum bar is connect with rotor iron seat, and the rotor copper sheathing is set on the outer wall of rotor iron seat, The anode corrugations ceramics are set in the outside of rotor copper sheathing, and the hollow bearing is arranged in rotor molybdenum bar and rotor iron seat. The utility model gives a kind of hollow target disc of combination, hollow bearing system, anode corrugations ceramic structure and new target disc and fixes The high heat dissipation medical X-ray tube of the cooling ball bearing in the inside of mode, to realize the solution of the big thermal capacity X-ray tube of 5MHU or more Certainly scheme；Wherein, the structure design of hollow target disc, the heat of target disc are directly conducted heat on rotor copper sheathing by cavity； The design of hollow shaft sleeve, cooling oil can direct cool to inside axle sleeve；The design of anode corrugations ceramics, the heat of rotor copper sheathing can It is radiated on anode corrugations ceramics, then through anode corrugations ceramic conductive into cooling oil；New anode disc fixed form Design, improves the reliability of high-speed rotation.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the target disc includes target disc stone Ink and TZM and rhenium tungsten layer are hollow structure inside the target disc graphite and TZM and rhenium tungsten layer, the TZM and the setting of rhenium tungsten layer In on the left side of target disc graphite, the left side of the support ring is bonded with the right side of TZM and rhenium tungsten layer, and support ring Left part is placed in the internal cavities of target disc graphite.TZM, graphite and support ring are connected by high-temperature soldering mode, and support ring is logical It crosses screw to connect with rotor, such target disc heat can only conduct heat to rotor, axis when not considering radiation by support ring The high temperature that will not directly bear target disc is held, bearing reliability can be effectively improved.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the hollow bearing includes sky On spindle sleeve, bearing outer ring, among bearing under ring, bearing outer ring and shaft, one end of the shaft be arranged in hollow shaft sleeve, It is arranged between the outer wall of shaft and the inner wall of hollow shaft sleeve under ring and bearing outer ring on the bearing outer ring, among bearing, institute Ring setting is stated among bearing on bearing outer ring and between under bearing outer ring, among the bearing under ring and bearing outer ring between set There are transition rings., the heat of target disc is less conducted to shaft, then is conducted to axle sleeve, is taken away heat by cooling oil, be can be improved The reliability of bearing.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, it is separate in the hollow bearing One end of shaft is equipped with cavity.The cavity inside of setting can enter coolant liquid, improve thermal diffusivity.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the shaft is close to target disc End is equipped with bearing flange.Hollow bearing is connect by setting bearing flange with rotor molybdenum bar.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the anode corrugations ceramics Outer wall is equipped with one group of ceramics ripple.Increase anode ceramic watch area, improves the heat-sinking capability of anode ceramics, the radiation of rotor copper sheathing Heat to anode ceramics can run through anode corrugations ceramic conductive into cooling oil, and heat a part of such target disc is logical It crosses metal-back to conduct into cooling oil, a part passes through anode ceramic conductive into cooling oil, as long as such bearing is at work Solve the fever of itself.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the anode corrugations ceramics Being equipped with anode close to the end of target disc can cut down greatly, and the anode corrugations ceramics are equipped with that anode is small cuts down far from the end of target disc.Sun It can greatly cut down and be connect with small cut down of anode with anode corrugations ceramic end soldering and sealing, ripple ceramic and end seal structure may insure homogeneous tube Concentricity reduces the mechanical stress between insulating materials and metal, enhances mechanical strength.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the target disc and support ring with Pass through 3-6 screw connection between rotor copper sheathing.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the rotor copper sheathing and hollow It is fixed between bearing by 6-12 screw.

Further, the high heat dissipation medical X-ray tube of the cooling ball bearing in above-mentioned inside, the screw is stainless steel Material is fixed by fusion point solid welding.It is designed using new anode disc fixed form, is fixed, can be improved existing by more screws Single screw fixation method in technology is wherein fixed between target disc and support ring and rotor copper sheathing using 3-6 screw, rotor copper It is fixed between set and hollow bearing using 6-12 screw, spot welding is melted using argon arc welding, do not need the realization of any other technique The high speed rotation 10800rpm of target disc, reliability are high.

Above-mentioned technical proposal can be seen that the utility model has the following beneficial effects: inside described in the utility model The high heat dissipation medical X-ray tube of cooling ball bearing, has the advantages that

1, the reliability that X-ray tube works under high speed rotation state is improved: due to using support ring and rotor copper sheathing 6 Screw connection and bearing are connected with 6 screws of rotor copper sheathing, avoid single fixed form, reduce target disc when rotating at high speed Loosening risk；

2, improve bearing service life and product reliability: the utility model target disc heat will not be directly conducted to bearing, Bearing is set to work at low temperature, it will not overheating deforming；

3, increase dielectric strength: using ripple ceramic structure, surface creepage distance can be increased, that is, increase insulation by force Degree；

4, increase homogeneous tube mechanical strength: using ripple ceramic and end seal structure, it is ensured that the concentricity of homogeneous tube reduces Mechanical stress between insulating materials and metal increases mechanical strength；

5, improve the ability for bearing secondary electron bombardment: ceramics can be resistant to 1400 degree of high temperature, bear secondary electron bombardment Ability be significantly larger than glass, thus improve the service life of X-ray tube.

In conclusion the X-ray tube technical solution can effectively improve the heat-sinking capability of target disc, it is reliable to improve bearing Property, so that anode thermal capacity is realized 5MHU or more.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the high heat dissipation medical X-ray tube of internal cooling ball bearing described in the utility model；

Fig. 2 is the structural schematic diagram of hollow target disc described in the utility model；

Fig. 3 is the structural schematic diagram of hollow bearing described in the utility model；

Fig. 4 is the structural schematic diagram of anode corrugations ceramics described in the utility model；

Fig. 5 is the structural schematic diagram of prior art X-ray tube described in the utility model；

Fig. 6 is the structural schematic diagram that target disc described in the utility model and hollow bearing radiate；

Fig. 7 is the partial enlarged view of Fig. 6.

In figure: target disc 1, support ring 2, rotor molybdenum bar 3, rotor copper sheathing 4, rotor iron seat 5, anode corrugations ceramics 6, hollow shaft Hold 7, target disc graphite 8, TZM and rhenium tungsten layer 9, hollow shaft sleeve 10, on bearing outer ring among 11, bearing 13 under ring 12, bearing outer ring, Shaft 14, cavity 15, bearing flange 16, ceramic ripple 17, anode can cut down greatly that 18, anode is small to cut down 19, screw 20, transition rings 21, target disc 1, anode glass bulb 1, rotor copper sheathing 1, bearing holder (housing, cover) 1, shaft 1, sleeve thread 1.

Specific embodiment

The embodiments of the present invention are described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng The embodiment for examining attached drawing description is exemplary, it is intended to for explaining the utility model, and should not be understood as to the utility model Limitation.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", " up time The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of Describe the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, It is constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, unless otherwise indicated, the meaning of " multiple " It is two or more, unless otherwise restricted clearly.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood as the case may be Concrete meaning in the present invention.

In the present invention unless specifically defined or limited otherwise, fisrt feature the "upper" of second feature or it "lower" may include that the first and second features directly contact, and also may include that the first and second features are not direct contacts but lead to Cross the other characterisation contact between them.Moreover, fisrt feature includes above the second feature " above ", " above " and " above " One feature is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.First is special Sign is directly below and diagonally below the second feature including fisrt feature under the second feature " below ", " below " and " below ", or only Indicate that first feature horizontal height is less than second feature.

Embodiment

The high heat dissipation medical X-ray tube of the cooling ball bearing in inside as shown in Figure 1, including target disc 1, support ring 2, rotor Molybdenum bar 3, rotor copper sheathing 4, rotor iron seat 5, anode corrugations ceramics 6 and hollow bearing 7, the target disc 1 are connect with support ring 2, institute It states support ring 2 to connect with rotor molybdenum bar 3, the rotor molybdenum bar 3 is connect with rotor iron seat 5, and the rotor copper sheathing 4 is set in rotor On the outer wall of iron seat 5, the anode corrugations ceramics 6 are set in the outside of rotor copper sheathing 4, and the hollow bearing 7 is arranged in rotor In molybdenum bar 3 and rotor iron seat 5.Oil-through hole is additionally provided on rotor molybdenum bar 3, cooling oil can be entered by oil-through hole, and be connect with bearing Touching, carries out the cooling of bearing.

Target disc 1 as shown in Figure 2 includes target disc graphite 8 and TZM and rhenium tungsten layer 9, the target disc graphite 8 and TZM and rhenium tungsten It is hollow structure inside layer 9, the TZM and rhenium tungsten layer 9 are set on the left side of target disc graphite 8, a left side for the support ring 2 End face is bonded with the right side of TZM and rhenium tungsten layer 9, and the left part of support ring 2 is placed in the internal cavities of target disc graphite 8. Hollow target disc structure design: the TZM and graphite and support ring of rhenium tungsten layer become whole by high-temperature soldering technique, support ring material Material uses molybdenum or TZM.

Hollow bearing 7 as shown in Figure 3 includes hollow shaft sleeve 10, ring 12, bearing outer ring among 11, bearing on bearing outer ring 13 and shaft 14 are descended, one end of the shaft 14 is arranged in hollow shaft sleeve 10, ring 12 among 11, bearing on the bearing outer ring And 13 be arranged between the outer wall of shaft 14 and the inner wall of hollow shaft sleeve 10 under bearing outer ring, the setting of ring 12 exists among the bearing On bearing outer ring 11 and bearing outer ring under between 13, among the bearing 13 under ring 12 and bearing outer ring between be equipped with transition rings 21.One end in hollow bearing 7 far from shaft 14 is equipped with cavity 15.Shaft 14 is equipped with bearing flange 16 close to the end of target disc 1. Hollow bearing design scheme: mainly the design of hollow shaft sleeve 10, specific design structure are shown in Fig. 3, and cooling oil can be directly cooled to Axle sleeve.

The design of above-mentioned target disc 1 and hollow bearing 7 as shown in Figures 6 and 7, so that the heat transfer that target disc 1 generates is to sky Mandrel holds the path extension of 7 and shaft 14, can be effectively reduced the temperature at hollow bearing 7 and shaft 14, specific to radiate Principle are as follows: target disc 1 generates heat, and since target disc 1 is hollow target disc, target disc 1 and rotor molybdenum bar 3 are not bonding structure, therefore heat Amount can only transfer heat on rotor molybdenum bar 3 along the transmitting of target disc 1 up to the screw of target disc 1 and 3 junction of rotor molybdenum bar, heat Amount is transmitted along rotor molybdenum bar 3 to the direction close to target disc 1, at the attachment screw for reaching rotor molybdenum bar 3 and hollow bearing 7, is led to It crosses screw to transfer heat on hollow bearing 7, this structure heat transfer path greatly prolongs, due to the outer wall of hollow shaft sleeve 10 It is directly contacted with cooling oil, constantly carries out the cooling of hollow shaft sleeve 10, therefore when heat transfer to hollow bearing 7, temperature is significantly It reduces, this structure plays good cooling effect, can guarantee the normal use of hollow bearing 7, prolong the service life.

The outer wall of anode corrugations ceramics 6 as shown in Figure 4 is equipped with one group of ceramics ripple 17.Anode corrugations ceramics 6 lean on The end of near target disk 1, which is equipped with anode, can cut down greatly 18, and the anode corrugations ceramics 6 are equipped with that anode is small to be cut down far from the end of target disc 1 19.Anode corrugations Ceramic Art Design: anode uses ripple ceramic, and ceramics use 95%, 97%, 99% aluminum oxide industrial ceramics, The ripple of any shape or the slot of transverse direction are opened in ceramic surfaces externally and internally, and ripple ceramic and the sealing structure that can be cut down use end seal, put down Envelope, sleeve and clamp, wherein clamp can be metal or ceramics.

More screw fixed forms of anode disc: pass through 3-6 screw 20 between target disc 1 and support ring 2 and rotor copper sheathing 4 Connection.It is fixed by 6-12 screw 20 between rotor copper sheathing 4 and hollow bearing 7.Screw 20 is that stainless steel material passes through melting Spot welding is fixed.Several screw fixed forms of anode disc: anode disc is connected by 6-12 screw with rotor copper sheathing, rotor copper Set is connected by 3-6 screw with bearing, and all fixing screws use stainless steel material, melts spot welding mode.

The embodiment of the utility model and the prior art is as follows:

The utility model mainly uses hollow target disc structure, specific embodiment are as follows: hollow target disc high-temperature soldering-rotor copper Welding twice-bearing integrated makeup is covered to install and make pottery with-dynamic balancing-ripple with-hollow target disc and rotor copper sheathing assembly-integral shaft Porcelain argon arc welding；Vacuum drying oven high temperature brazing and argon arc welding technique need to be used.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvement can also be made, these improvement also should be regarded as The protection scope of the utility model.

Claims (10)

1. a kind of high heat dissipation medical X-ray tube of internal cooling ball bearing, it is characterised in that: including target disc (1), support ring (2), rotor molybdenum bar (3), rotor copper sheathing (4), rotor iron seat (5), anode corrugations ceramic (6) and hollow bearing (7), the target disc (1) it is connect with support ring (2), the support ring (2) connect with rotor molybdenum bar (3), the rotor molybdenum bar (3) and rotor iron seat (5) it connects, the rotor copper sheathing (4) is set on the outer wall of rotor iron seat (5), and the anode corrugations ceramic (6), which are set in, to be turned The outside of sub- copper sheathing (4), hollow bearing (7) setting is in rotor molybdenum bar (3) and rotor iron seat (5).

2. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 1, it is characterised in that: described Target disc (1) includes target disc graphite (8) and TZM and rhenium tungsten layer (9), and the target disc graphite (8) and TZM and rhenium tungsten layer (9) inside are For hollow structure, the TZM and rhenium tungsten layer (9) are set on the left side of target disc graphite (8), the left end of the support ring (2) Face is bonded with the right side of TZM and rhenium tungsten layer (9), and the left part of support ring (2) is placed in the internal cavities of target disc graphite (8) In.

3. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 1, it is characterised in that: described Hollow bearing (7) includes hollow shaft sleeve (10), (11) on bearing outer ring, (13) and axis under ring (12), bearing outer ring among bearing Bar (14), one end setting of the shaft (14) is in hollow shaft sleeve (10), (11), bearing centre ring on the bearing outer ring (12) and under bearing outer ring (13) are arranged between the outer wall of shaft (14) and the inner wall of hollow shaft sleeve (10), among the bearing Ring (12) is arranged on bearing outer ring under (11) and bearing outer ring between (13), among the bearing under ring (12) and bearing outer ring (13) transition rings (21) are equipped between.

4. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 3, it is characterised in that: described One end in hollow bearing (7) far from shaft (14) is equipped with cavity (15).

5. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 4, it is characterised in that: described Shaft (14) is equipped with bearing flange (16) close to the end of target disc (1).

6. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 1, it is characterised in that: described The outer wall of anode corrugations ceramics (6) is equipped with one group of ceramics ripple (17).

7. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 6, it is characterised in that: described The end of the close target disc (1) of anode corrugations ceramics (6), which is equipped with anode, can cut down greatly (18), and the anode corrugations ceramic (6) are separate The end of target disc (1) is equipped with that anode is small cuts down (19).

8. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 1, it is characterised in that: described It is connect between target disc (1) and support ring (2) and rotor copper sheathing (4) by 3-6 screw (20).

9. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 8, it is characterised in that: described It is fixed by 6-12 screw (20) between rotor copper sheathing (4) and hollow bearing (7).

10. the high heat dissipation medical X-ray tube of internal cooling ball bearing according to claim 9, it is characterised in that: described Screw (20) is that stainless steel material is fixed by fusion point solid welding.