Liquid metal sliding bearing, X-ray tube and CT scanning device

文档序号：1153964 发布日期：2020-09-15 浏览：13次中文

阅读说明：本技术 液态金属滑动轴承、x射线管以及ct扫描装置 (Liquid metal sliding bearing, X-ray tube and CT scanning device ) 是由杨小明于 2020-07-06 设计创作，主要内容包括：本申请公开了一种液态金属滑动轴承、X射线管以及CT扫描装置。液态金属滑动轴承,包括：旋转芯(100)；能够相对于旋转芯(100)进行旋转的旋转构件(200)；以及设置于旋转芯(100)和旋转构件(200)之间的液态金属,其中旋转构件(200)包括旋转外壳(210)以及与旋转外壳(210)连接的旋转法兰(220),并且旋转外壳(210)以及旋转法兰(220)沿液态金属滑动轴承的轴线设置,旋转外壳(210)和旋转法兰(220)之间形成有第一密封结构,第一密封结构包括环绕液态金属滑动轴承的轴线形成的第一环形凸台(241)。(The application discloses a liquid metal sliding bearing, an X-ray tube and a CT scanning device. Liquid metal sliding bearing comprising: a rotary core (100); a rotating member (200) that can rotate relative to the rotating core (100); and liquid metal disposed between the rotary core (100) and the rotary member (200), wherein the rotary member (200) includes a rotary housing (210) and a rotary flange (220) connected to the rotary housing (210), and the rotary housing (210) and the rotary flange (220) are disposed along an axis of the liquid metal sliding bearing, and a first sealing structure is formed between the rotary housing (210) and the rotary flange (220), the first sealing structure including a first annular boss (241) formed around the axis of the liquid metal sliding bearing.)

1. A liquid metal sliding bearing comprising: a rotary core (100); a rotating member (200) that is rotatable relative to the rotating core (100); and a liquid metal arranged between the rotating core (100) and the rotating member (200), wherein the rotating member (200) comprises a rotating housing (210) and a rotating flange (220) connected to the rotating housing (210), and the rotating housing (210) and the rotating flange (220) are arranged along the axis of the liquid metal plain bearing, characterized in that,

a first sealing structure is formed between the rotary housing (210) and the rotary flange (220), the first sealing structure including a first annular boss (241) formed around an axis of the liquid metal plain bearing.

2. A liquid metal slide bearing according to claim 1,

the first annular boss (241) is formed on a first surface (211) of the rotating housing (210) and abuts a second surface (221) of the rotating flange (220), and an outer diameter of the first annular boss (241) is smaller than an outer diameter of the rotating housing (210); or

The first annular boss (241) is formed on the second surface (221) of the rotating flange (220) and abuts against the first surface (211) of the rotating housing (210), and an outer diameter of the first annular boss (241) is smaller than an outer diameter of the rotating flange (220).

3. Liquid metal slide bearing according to any one of claims 1 to 2, wherein the rotary housing (210) is further provided with a plurality of first screw holes (212) for fixed connection with the rotary flange (220), and the rotary flange (220) is provided with a plurality of second screw holes (222) corresponding to the plurality of first screw holes (212), respectively, wherein

The first plurality of screw holes (212) and the second plurality of screw holes (222) are disposed outside the first seal structure.

4. A liquid metal plain bearing according to claim 1, wherein the rotary member (200) further comprises: and the rotating fixed seat (230) is connected with the rotating flange (220) and is used for being connected with a magnetic element generating driving force so as to drive the liquid metal sliding bearing to rotate, and the rotating flange (220) and the rotating fixed seat (230) are arranged along the axis of the liquid metal sliding bearing.

5. A liquid metal slide bearing according to claim 4,

a second sealing structure is arranged between the rotating flange (220) and the rotating stator (230), wherein the second sealing structure comprises a second annular boss (242) formed around the axis of the liquid metal sliding bearing; or

The second annular boss (242) is formed on a third surface (223) of the rotating flange (220) and abuts against a fourth surface (231) of the rotating seat (230), and an outer diameter of the second annular boss (242) is smaller than an outer diameter of the rotating flange (220).

6. A liquid metal slide bearing according to claim 5, wherein the second annular boss (242) is provided to the fourth surface (231) of the rotating stator (230) and abuts the third surface (223) of the rotating flange (220), and the outer diameter of the second annular boss (242) is smaller than the outer diameter of the rotating stator (230).

7. Liquid metal slide bearing according to any one of claims 5 to 6, wherein the rotating flange (220) is further provided with a plurality of third screw holes (224) for fixed connection with the rotating stator (230), and the rotating stator (230) is provided with a plurality of fourth screw holes (232) corresponding to the plurality of third screw holes (224), respectively, wherein

The plurality of third screw holes (224) and the plurality of fourth screw holes (232) are provided outside the second seal structure.

8. A liquid metal sliding bearing comprising: a rotary core (100); a rotating member (200) that is rotatable relative to the rotating core (100); and a liquid metal disposed between the rotating core (100) and the rotating member (200), wherein the rotating member (200) comprises a rotating housing (210); a rotating flange (220) connected to the rotating housing (210); and a rotary stator (230) connected to the rotary flange (220), the rotary stator (230) being adapted to be connected to a magnetic element generating a driving force for rotating the liquid metal plain bearing, and the rotary housing (210), the rotary flange (220) and the rotary stator (230) being arranged along an axis of the liquid metal plain bearing, characterized in that,

a second sealing structure is disposed between the rotating flange (220) and the rotating stator (230), wherein the second sealing structure includes a second annular boss (242) formed around an axis of the liquid metal plain bearing.

9. An X-ray tube, comprising: a liquid metal sliding bearing according to any one of claims 1 to 8.

10. A CT scanner, comprising: the X-ray tube of claim 9.

Technical Field

The application relates to the technical field of X-ray tubes, in particular to a liquid metal sliding bearing, an X-ray tube and a CT (computed tomography) scanning device.

Background

At present, liquid metal sliding bearings are widely used in X-ray tubes. The rotating assembly of the liquid metal sliding bearing generally consists of a plurality of parts, and the parts are fixed by screws. Due to the machining precision, a small gap must exist between the contact surfaces of the two parts of the rotating assembly. Therefore, when the rotating assembly rotates at a high speed, the liquid metal overflows from the gap in the radial direction under the action of centrifugal force. In order to solve the problem of radial leakage of a liquid metal sliding bearing, the conventional leakage prevention method is to plate a flexible coating or mount a flexible gasket on a gap on the surface of a part so as to prevent liquid metal from leaking from a gap between the two parts under the action of centrifugal force when a rotor rotates at a high speed. However, because the sealing surfaces of the two parts are wide, it is difficult to achieve a smooth surface across the entire sealing surfaces of the two parts, which eventually results in liquid metal leaking from the gap.

Aiming at the technical problem that in the prior art, because the sealing surfaces of two parts of a rotating assembly in a liquid metal sliding bearing are wide, the whole sealing surfaces of the two parts are difficult to flatten, and finally the liquid metal leaks from a gap, an effective solution is not provided at present.

Disclosure of Invention

The utility model provides a liquid metal slide bearing, X-ray tube and CT scanning device to at least, solve exist among the prior art because two part sealing faces of rotating assembly are broad in the liquid metal slide bearing, hardly do the whole sealed face planarization with two parts, thereby finally lead to the technical problem that liquid metal leaks from the clearance.

According to an aspect of the present application, there is provided a liquid metal sliding bearing comprising: rotating the core; a rotating member rotatable with respect to the rotating core; and a liquid metal disposed between the rotary core and the rotary member, wherein the rotary member includes a rotary housing and a rotary flange connected to the rotary housing, and the rotary housing and the rotary flange are disposed along an axis of the liquid metal sliding bearing, and wherein a first seal structure is formed between the rotary housing and the rotary flange, the first seal structure including a first annular boss formed around the axis of the liquid metal sliding bearing.

Optionally, the first annular boss is formed on the first surface of the rotary casing and abuts the second surface of the rotary flange, and an outer diameter of the first annular boss is smaller than an outer diameter of the rotary casing.

Optionally, the first annular boss is formed on the second surface of the rotating flange and abuts the first surface of the rotating housing, and an outer diameter of the first annular boss is smaller than an outer diameter of the rotating flange.

Optionally, the rotary housing is further provided with a plurality of first screw holes for fixed connection with the rotary flange, and the rotary flange is provided with a plurality of second screw holes corresponding to the plurality of first screw holes, respectively, wherein the plurality of first screw holes and the plurality of second screw holes are provided in an outer side of the first sealing structure.

Optionally, the rotating member further comprises: the rotary fixed seat is connected with the rotary flange and used for being connected with a magnetic element generating driving force to drive the liquid metal sliding bearing to rotate, and the rotary flange and the rotary fixed seat are arranged along the axis of the liquid metal sliding bearing.

Optionally, a second sealing structure is provided between the rotary flange and the rotary stator, wherein the second sealing structure comprises a second annular boss formed around the axis of the liquid metal plain bearing.

Optionally, a second annular boss is formed on the third surface of the rotating flange and abuts the fourth surface of the rotating seat, and the outer diameter of the second annular boss is smaller than the outer diameter of the rotating flange.

Optionally, a second annular boss is formed on the fourth surface of the rotating stator and abuts the third surface of the rotating flange, and the outer diameter of the second annular boss is smaller than the outer diameter of the rotating stator.

Optionally, the rotary flange is further provided with a plurality of third screw holes for being fixedly connected with the rotary fixed seat, and the rotary fixed seat is provided with a plurality of fourth screw holes respectively corresponding to the plurality of third screw holes, wherein the plurality of third screw holes and the plurality of fourth screw holes are arranged on the outer side of the second sealing structure.

According to another aspect of the present application, there is provided a liquid metal sliding bearing comprising: rotating the core; a rotating member rotatable with respect to the rotating core; and a liquid metal disposed between the rotating core and the rotating member, wherein the rotating member includes a rotating housing; a rotating flange connected with the rotating housing; and the rotary fixed seat is connected with the rotary flange, the rotary fixed seat is used for being connected with a magnetic element generating driving force to drive the liquid metal sliding bearing to rotate, the rotary shell, the rotary flange and the rotary fixed seat are arranged along the axis of the liquid metal sliding bearing, and a second sealing structure is arranged between the rotary flange and the rotary fixed seat and comprises a second annular boss formed by surrounding the axis of the liquid metal sliding bearing.

According to another aspect of the application, an X-ray tube is provided comprising a liquid metal sliding bearing.

According to another aspect of the present application, there is provided a CT scanning apparatus comprising an X-ray tube.

Thus, according to the present embodiment, there is provided a liquid metal sliding bearing in which a first seal structure is formed between a rotating housing and a rotating flange of a rotating member of the liquid metal sliding bearing, the first seal structure including a first annular projection provided around an axis of the liquid metal sliding bearing. Wherein the first annular land forms a narrow sealing surface between the rotary housing and the rotary flange. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And because the specific pressure of the sealing surface is improved, the sealing effect is more effective, and further the leakage of the liquid metal between the rotating core and the rotating component can be effectively prevented. And the technical problem that the whole sealing surfaces of the two parts are difficult to flatten due to the fact that the sealing surfaces of the two parts are wide in the prior art, and liquid metal leaks from the gap finally is solved.

The above and other objects, advantages and features of the present application will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the present application will be described in detail hereinafter by way of illustration and not limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic perspective view of a liquid metal plain bearing according to a first aspect of an embodiment of the present application;

FIG. 2 is a schematic view of the rotating housing shown in FIG. 1;

FIG. 3 is a schematic view of the rotating flange shown in FIG. 1;

FIG. 4 is a schematic view of the rotary stator shown in FIG. 1;

FIG. 5 is an enlarged schematic view of the liquid stop ring shown in FIG. 1;

FIG. 6 is a schematic view of a liquid stop ring according to an embodiment of the present application; and

fig. 7 is a schematic view of a rotary core according to an embodiment of the present application.

Detailed Description

It should be noted that, in the present disclosure, the embodiments and features of the embodiments may be combined with each other without conflict. The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

In order to make the technical solutions of the present disclosure better understood by those skilled in the art, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only some embodiments of the present disclosure, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing the embodiments of the disclosure herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Fig. 1 is a schematic plan view of a liquid metal plain bearing according to a first aspect of an embodiment of the present application. Referring to fig. 1, a liquid metal plain bearing includes: a rotary core 100; a rotary member 200 rotatable with respect to the rotary core 100; and a liquid metal disposed between the rotary core 100 and the rotary member 200, wherein the rotary member 200 includes a rotary housing 210 and a rotary flange 220 connected to the rotary housing 210, and the rotary housing 210 and the rotary flange 220 are disposed along an axis of the liquid metal sliding bearing, and a first sealing structure is formed between the rotary housing 210 and the rotary flange 220, the first sealing structure including a first annular boss 241 formed around the axis of the liquid metal sliding bearing.

As mentioned in the background, liquid metal sliding bearings are widely used in X-ray tubes today. The rotating assembly of the liquid metal sliding bearing generally consists of a plurality of parts, and the parts are fixed by screws. Due to the machining precision, a small gap must exist between the contact surfaces of the two parts of the rotating assembly. Therefore, when the rotating assembly rotates at a high speed, the liquid metal overflows from the gap in the radial direction under the action of centrifugal force. In order to solve the problem of radial leakage of a liquid metal sliding bearing, the conventional leakage prevention method is to plate a flexible coating or mount a flexible gasket on a gap on the surface of a part so as to prevent liquid metal from leaking from a gap between the two parts under the action of centrifugal force when a rotor rotates at a high speed. However, because the sealing surfaces of the two parts are wide, it is difficult to achieve a smooth surface across the entire sealing surfaces of the two parts, which eventually results in liquid metal leaking from the gap.

In view of this, referring to fig. 1, the present embodiment provides a liquid metal sliding bearing in which a first sealing structure is formed between the rotating housing 210 and the rotating flange 220 of the rotating member 200 of the liquid metal sliding bearing, the first sealing structure including a first annular boss 241 disposed around the axis of the liquid metal sliding bearing. Wherein the first annular boss 241 forms a narrow sealing surface between the rotary housing 210 and the rotary flange 220. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Therefore, the technical problem that in the prior art, because the sealing surfaces of two parts are wide, the whole sealing surfaces of the two parts are difficult to flatten, and liquid metal leaks from a gap is finally solved.

Further, as shown in fig. 1, a filling hole 213 for filling liquid metal between the rotary core 100 and the rotary member 200 is provided at a front end portion of the rotary housing 210.

Alternatively, as shown with reference to fig. 1, 2 and 3, the first annular boss 241 is formed on the first surface 211 of the rotating housing 210 and abuts against the second surface 221 of the rotating flange 220, and the outer diameter of the first annular boss 241 is smaller than the outer diameter of the rotating housing 210. Wherein the first surface 211 and the second surface 221 are perpendicular to the axial direction of the liquid metal sliding bearing and are opposite to each other. And since the outer diameter of the first annular projection 241 is smaller than the outer diameter of the rotary housing 210, the connection between the rotary housing 210 and the rotary flange 220 is changed from a wide sealing surface to a narrow sealing surface. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Optionally, the first annular boss 241 is formed on the second surface 221 of the rotating flange 220 and abuts the first surface 211 of the rotating housing 210, and an outer diameter of the first annular boss 241 is smaller than an outer diameter of the rotating flange 220. Although not shown in the drawings, the first annular boss 241 of the first sealing structure according to the present embodiment may be disposed on the first surface 211 of the rotating housing 210 or the second surface 221 of the rotating flange 220. Both of these ways may achieve a narrow-face connection between the rotating housing 210 and the rotating flange 220. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Alternatively, as shown in fig. 2 and 3, the rotating housing 210 is further provided with a plurality of first screw holes 212 for fixedly connecting with the rotating flange 220, and the rotating flange 220 is provided with a plurality of second screw holes 222 corresponding to the plurality of first screw holes 212, respectively, wherein the plurality of first screw holes 212 and the plurality of second screw holes 222 are provided at an outer side of the first sealing structure. The rotary housing 210 and the rotary flange 220 are fixedly coupled by a plurality of first screw holes 212 and a plurality of second screw holes 222. And the influence of the screw holes on the leakage of the liquid metal along between the rotary case 210 and the rotary flange 220 is eliminated by disposing the plurality of first screw holes 212 and the plurality of second screw holes 222 at the outer side of the first sealing structure in the design of the present embodiment. And further solves the technical problems that in the prior art, because a threaded hole for connecting a fixed part is processed between the sealing surfaces of two parts of a rotating assembly in a liquid metal sliding bearing, the whole rough surface is difficult to fill and flatten by a coating film or a gasket, and finally liquid metal leaks from a gap

Alternatively, as shown with reference to fig. 1, the rotating member 200 further includes: the rotary stator 230 is connected to the rotary flange 220 and is used for being connected to a magnetic element generating a driving force so as to drive the liquid metal sliding bearing to rotate, and the rotary flange 220 and the rotary stator 230 are arranged along the axis of the liquid metal sliding bearing. Thereby, the rotary stator 230 is connected with an external magnetic element generating a driving force to drive the rotary member 200 to rotate, so that the liquid metal sliding bearing operates. In addition, the leakage of part of the liquid metal can be solved by the design of the rotary stator 230.

Optionally, a second sealing structure is provided between the rotating flange 220 and the rotating stator 230, wherein the second sealing structure comprises a second annular boss 242 formed around the axis of the liquid metal plain bearing.

Specifically, referring to fig. 1, the second sealing structure is used to design a wide sealing surface between the rotating flange 220 and the rotating stator 230 as a narrow sealing surface. Thereby being beneficial to improving the flatness and the roughness processing precision of the second sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Alternatively, as shown in fig. 1, 3 and 4, the second annular boss 242 is disposed on the third surface 223 of the rotating flange 220 and abuts the fourth surface 231 of the rotating stator 230, and the outer diameter of the second annular boss 242 is smaller than the outer diameter of the rotating flange 220. Wherein the third surface 223 and the fourth surface 231 are perpendicular to the axial direction of the liquid metal sliding bearing and are opposite to each other. And since the outer diameter of the second annular boss 242 is smaller than the outer diameter of the rotary flange 220, the connection between the rotary flange 220 and the rotary stator 230 is changed from a wide sealing surface to a narrow sealing surface. Thereby being beneficial to improving the flatness and the roughness processing precision of the second sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Optionally, a second annular boss 242 is disposed on the fourth surface 231 of the rotating stator 230 and abuts the third surface 223 of the rotating flange 220, and the outer diameter of the second annular boss 242 is smaller than the outer diameter of the rotating stator 230. Although not shown in the drawings, the second annular boss 242 of the second sealing structure according to the present embodiment may be disposed on the third surface 223 of the rotating flange 220 or the fourth surface 231 of the rotating stator 230. Both of these ways may achieve a narrow face connection between the rotating flange 220 and the rotating stator 230. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Alternatively, referring to fig. 3 and 4, the rotating flange 220 is further provided with a plurality of third screw holes 224 for fixedly connecting with the rotating stator 230, and the rotating stator 230 is provided with a plurality of fourth screw holes 232 corresponding to the plurality of third screw holes 224, respectively, wherein the plurality of third screw holes 224 and the plurality of fourth screw holes 232 are disposed at an outer side of the second sealing structure. The rotating flange 220 and the rotating holder 230 are fixedly coupled by a plurality of third screw holes 224 and a plurality of fourth screw holes 232. And in the design of the present embodiment, by disposing the plurality of third screw holes 224 and the plurality of fourth screw holes 232 at the outer side of the second sealing structure, the influence of the screw holes on the leakage of the liquid metal along between the rotating flange 220 and the rotating stator 230 is eliminated. And then solved among the prior art because processing has the screw hole that is used for connecting fixed part in the middle of two part sealing faces of rotation assembly in the liquid metal slide bearing, the coating film or gasket are difficult to accomplish to pack whole coarse surface and smooth, finally lead to the technical problem that liquid metal leaks from the clearance.

Further, referring to fig. 1, according to a second aspect of the present embodiment, there is provided a liquid metal sliding bearing including: a rotary core 100; a rotary member 200 rotatable with respect to the rotary core 100; and a liquid metal disposed between the rotary core 100 and the rotary member 200, wherein the rotary member 200 includes a rotary housing 210; a rotary flange 220 connected to the rotary housing 210; and a rotary stator 230 connected to the rotary flange 220, wherein the rotary stator 230 is connected to a magnetic element generating a driving force to rotate the liquid metal sliding bearing, and the rotary housing 210, the rotary flange 220 and the rotary stator 230 are disposed along an axis of the liquid metal sliding bearing. A second sealing structure is provided between the rotating flange 220 and the rotating stator 230, wherein the second sealing structure comprises a second annular boss 242 formed around the axis of the liquid metal plain bearing.

In view of this, referring to fig. 1, the present embodiment provides a liquid metal sliding bearing in which a second sealing structure is provided between the rotating flange 220 and the rotating stator 230 of the rotating member 200 of the liquid metal sliding bearing, the second sealing structure including a second annular boss 242 disposed around the axis of the liquid metal sliding bearing. Wherein the second annular land 242 forms a narrow sealing surface between the rotating flange 220 and the rotating stator 230. Thereby being beneficial to improving the flatness and the roughness processing precision of the second sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented.

Therefore, by the mode, the problem that in the prior art, because the sealing surfaces of two parts are wide, the whole sealing surfaces of the two parts are difficult to flatten, and liquid metal leaks from a gap finally is solved.

Furthermore, although not shown in the drawings, a third aspect of embodiments of the present application provides an X-ray tube including the liquid metal sliding bearing according to the first or second aspect of the present application.

In particular, the description of the liquid metal sliding bearing refers to the content of the first aspect or the second aspect of the present embodiment, and is not repeated here.

Furthermore, although not shown in the drawings, a fourth aspect of the present embodiment provides a CT scanning apparatus including the X-ray tube according to the third aspect of the present embodiment.

Specifically, the description of the X-ray tube refers to the description of the third aspect of the present embodiment, and is not repeated here.

Thus, according to the present embodiment, a liquid metal plain bearing is provided, wherein a first sealing structure is formed between the rotary housing 210 and the rotary flange 220 of the rotary member 200 of the liquid metal plain bearing, the first sealing structure comprising a first annular boss 241 arranged around the axis of the liquid metal plain bearing. Wherein the first annular boss 241 forms a narrow sealing surface between the rotary housing 210 and the rotary flange 220. Thereby being beneficial to improving the flatness and the roughness processing precision of the first sealing structure (narrow sealing surface). And since the specific pressure of the sealing surface is increased, the sealing effect is more effective, and thus the leakage of the liquid metal between the rotary core 100 and the rotary member 200 can be effectively prevented. And the technical problem that the whole sealing surfaces of the two parts are difficult to flatten due to the fact that the sealing surfaces of the two parts are wide in the prior art, and liquid metal leaks from the gap finally is solved.

Further, referring to fig. 7, the liquid metal sliding bearing includes: a rotary core 100; a rotary member 200 rotatable with respect to the rotary core 100; and a liquid metal disposed between the rotary core 100 and the rotary member 200, wherein the rotary member 200 includes a rotary shell 210, the rotary shell 210 is sleeved on the rotary core 100 from a front side of the rotary core 100, and the rotary core 100 includes a rotary core front part 110 fitted with the rotary shell 210 and a rotary core rear part 120 not fitted with the rotary shell 210, the liquid metal plain bearing further includes: and liquid blocking rings 310 and 320 disposed at the rear part 120 of the rotary core, the liquid blocking rings 310 and 320 being disposed around the rotary core 100, and at least a portion 311 and 321 of the liquid blocking rings 310 and 320 being connected to the rotary core 100 and forming a sealing structure.

Specifically, the liquid blocking rings 310, 320 are provided at the rotary core rear portion 120 of the rotary core 100 of the liquid metal sliding bearing, the liquid blocking rings 310, 320 are provided around the rotary core 100, and at least a portion 311, 321 of the liquid blocking rings 310, 320 is connected with the rotary core 100 and forms a sealing structure. Therefore, most of the leaked liquid metal can be stored through the sealing structure formed by the liquid baffle rings 310 and 320 and the rotary core 100, and the liquid metal between the rotary core 100 and the rotary member 200 is effectively prevented from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100. And the technical problem that in the method for preventing the liquid metal in the liquid metal sliding bearing from leaking into the vacuum space of the CT bulb tube in the prior art, only the scheme for preventing the liquid metal from flowing into the vacuum space of the CT bulb tube through the rotating part is designed, and the liquid metal still affects the safe operation of the CT bulb tube because the liquid metal leaks into the vacuum space in the CT bulb tube along the surface of the stator part is not considered.

Alternatively, referring to fig. 5, by adding the first liquid-blocking ring 310 between the rotating flange 220 and the rotating core 100, the liquid metal can be effectively blocked from leaking into the vacuum space of the CT bulb along the surface of the rotating core 100 by the cooperation of the rotating flange 220 and the first liquid-blocking ring 310.

In addition, through the cooperation use between the rotating flange 220 and the sound part of first fender liquid ring 310, set up the anti-leakage structure simultaneously on rotating part and static part promptly, to restraining the axial liquid metal leakage, extension bulb life has better effect.

Alternatively, referring to fig. 5, the rotating flange 220 includes a first aperture portion 225 and a second aperture portion 226 arranged in an axial direction, wherein the first aperture portion 225 is disposed at a front side of the second aperture portion 226, and an inner diameter of the first aperture portion 225 is smaller than an inner diameter of the second aperture portion 226, and wherein a first liquid blocking ring 310 is disposed between the second aperture portion 226 of the rotating flange 220 and the rotating core 100. Therefore, the first liquid blocking ring 310 is arranged in the space formed between the rotating cores 100 of the second hole parts 226 of the rotating flange 220, and the liquid metal is effectively prevented from leaking into the vacuum space of the CT bulb along the surface of the rotating core 100 through the cooperation of the rotating flange 220 and the first liquid blocking ring 310.

Alternatively, referring to fig. 5 and 6, the first liquid baffle ring 310 includes a first connection portion 311 connected to the rotary core 100 and a first extension portion 312 extending forward from the first connection portion 311, and the first extension portion 312 is provided with a first annular groove 3121 toward an inner surface of the rotary core 100. A first annular groove 3121 is provided at the inner surface of the forwardly extending first extension 312 toward the rotary core 100, and most of the liquid metal leaking along the rotary core 100 is stored through the first annular groove 3121. Thereby effectively preventing the liquid metal from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100.

Optionally, referring to fig. 5, the interface 227 between the first and second bore portions 225, 226 is provided with a second annular groove 2271, wherein the first extension 312 extends into the second annular groove 2271 and is not in contact with the second annular groove 2271; and the dividing surface 227 extends toward the first connection portion 311 near the inner end 2272 of the rotary core 100 and does not contact the first connection portion 311. Through the cooperation between the second annular groove 2271 and the dividing surface 227 close to the inner end 2272 of the rotary core 100 and the first liquid baffle ring 310, the path of the liquid metal leaking along the rotary core 100 becomes tortuous, and the CT bulb tube has remarkable effects of inhibiting the liquid metal from leaking and prolonging the service life of the CT bulb tube.

Alternatively, as shown in fig. 5 and 7, a first step surface 121 is provided at a connection of the rotation core rear portion 120 of the rotation core 100 and the first connection portion 311, and the first step surface 121 abuts against a front side of the first connection portion 311. The first connection portion 311 of the first liquid blocking ring 310 is matched with the first step surface 121 of the rotating core 100, so that a proper distance between the first liquid blocking ring 310 and the adjacent rotating component (the rotating flange 220) is ensured, and the normal operation of the liquid metal sliding bearing is not affected by the friction of the moving and static components.

In addition, the diameter of the inner circular hole of the first liquid baffle ring 310 is mounted with the rotary core 100 by interference fit. In order to prevent the first liquid blocking ring 310 from moving, it may be reinforced by spot-welding it to the rotary core 100 after installation.

Alternatively, referring to fig. 5, the rotating member 200 further includes a rotating stator 230 connected to the rotating flange 220 for connecting with a magnetic element generating a driving force to rotate the liquid metal sliding bearing, and the rotating stator 230 is disposed at a rear side of the rotating flange 220 along an axis of the liquid metal sliding bearing, and wherein the liquid stopping ring 310, 320 includes a second liquid stopping ring 320 disposed at a rear side of the rotating stator 230. The second liquid blocking ring 320 is added between the rotary fixed seat 230 and the rotary core 100, and the liquid metal can be effectively blocked from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100 by the cooperation of the rotary fixed seat 230 and the second liquid blocking ring 320.

In addition, through the cooperation use between the rotating stator 230 and the moving and static parts of the second liquid retaining ring 320, namely, the leakage-proof structure is arranged on the rotating part and the static part at the same time, the liquid metal leakage in the axial direction is restrained, the service life of the bulb tube is prolonged, and a better effect is achieved.

Alternatively, as shown in fig. 5, a third annular groove 233 is provided at a rear side of the rotary stator 230, and the second stopper ring 320 includes a second connection part 321 connected to the rotary core 100 and a second extension part 322 extending from the second connection part 321 to the third annular groove 233. The second extension 322 is provided with a fourth annular groove 3221 toward the inner surface of the rotary core 100. By the cooperative use of the fourth annular groove 3221 and the third annular groove 233 of the rotary stator 230, most of the liquid metal leaked along the rotary core 100 is stored by the fourth annular groove 3221. Thereby effectively preventing the liquid metal from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100.

Alternatively, referring to fig. 5, the second extension 322 extends inside the third annular groove 233 and does not contact the third annular groove 233; and the third annular groove 233 extends toward the second connecting portion 321 near the inside end 3211 of the rotary core 100, and does not contact the second connecting portion 321. Through the matching use of the fourth annular groove 3221 and the third annular groove 233 of the rotary stator 230 near the inner end 3211 of the rotary core 100, the path of the liquid metal leaking along the rotary core 100 becomes tortuous, which has significant effects on inhibiting the liquid metal leakage and prolonging the service life of the CT bulb.

Alternatively, as shown in fig. 5 and 7, a second step surface 122 is provided at a connection portion of the rotary core rear portion 120 and the second connection portion 321 of the rotary core 100, and the second step surface 122 is provided at a front side of the second connection portion 321. The second connecting portion 321 of the second liquid retaining ring 320 is matched with the second step surface 122 of the rotating core 100, so as to ensure a suitable distance between the second liquid retaining ring 320 and the adjacent rotating component (the rotating fixed seat 230), so as to prevent the moving and static components from colliding and rubbing, and influence the normal operation of the liquid metal sliding bearing.

Alternatively, referring to fig. 7, a liquid storage cavity 113 for storing liquid metal is provided in the rotary core 100; and the surface of the rotary core 100 is provided with at least one reservoir hole 133, 114, 115, and the at least one reservoir hole 133, 114, 115 communicates with the reservoir cavity 113.

Specifically, a liquid storage cavity 113 for storing liquid metal is provided in the rotary core 100 of the liquid metal sliding bearing; and the surface of the rotary core 100 is provided with at least one reservoir hole 133, 114, 115, and the at least one reservoir hole 133, 114, 115 communicates with the reservoir cavity 113. Thus, by providing the reservoir cavity 113 inside the rotary core 100, a large amount of liquid metal can be stored. When the liquid metal between the rotary core 100 and the rotary member 200 leaks, the liquid metal in the reservoir chamber 113 may flow between the rotary core 100 and the rotary member 200 through the reservoir holes 133, 114, 115 in the operating state of high-speed operation. It is therefore possible to effectively replenish the liquid metal between the rotary core 100 and the rotary member 200, alleviate the problem of the rotation being not smooth due to the shortage of the liquid metal, and effectively suppress the damage to the bearing due to the liquid metal leakage. And then solved among the prior art the storage space of the emollient reservoir between thrust bearing boss and the runner assembly limited, can not effectively restrain the liquid metal and leak the technical problem that causes the damage to the bearing.

Alternatively, as shown in fig. 1 and 7, the rotary member 200 includes a rotary housing 210, the rotary housing 210 is fitted over the rotary core 100 from the front side of the rotary core 100, and the at least one reservoir hole 133, 114, 115 includes a first reservoir hole 114 provided at the front end surface of the rotary core 100. The plurality of first reservoir holes 114 are formed in the front end portion of the rotary core 100, and when the liquid metal leaks, the liquid metal in the reservoir chamber 113 may flow between the rotary core 100 and the rotary member 200 through the plurality of first reservoir holes 114 in a high-speed operation state, thereby sufficiently supplementing the liquid metal on the radial bearing surface. The problem of unsmooth rotation caused by insufficient liquid metal is solved, and damage to the bearing caused by liquid metal leakage is effectively inhibited. And the technical problem that the influence of liquid metal leakage on the operation of the radial bearing is reduced when the bearing is started and stopped and works and operates in the prior art is not considered in the prior art is solved.

Further, as shown in fig. 7, a plurality of first reservoir holes 114 may be uniformly distributed at the front end portion of the rotary core 100 and communicate with the respective corresponding reservoir cavities 113.

Alternatively, as shown in FIG. 7, the first reservoir port 114 and the reservoir chamber 113 may be formed by the same hole. That is, the first reservoir hole 114 and the reservoir cavity 113 are formed by the same drilling process, and the inner diameters of the reservoir cavity 113 and the first reservoir hole 114 are the same. Therefore, in this way, the first reservoir hole 114 and the reservoir cavity 113 can be formed by the same process, and the processing cost is saved.

Alternatively, as shown with reference to fig. 7, the rotary core 100 includes: a rotary core front portion 110; a rotary core back 120; and an annular boss 130 (i.e., a thrust bearing boss) located between the rotary core forward portion 110 and the rotary core aft portion 120, wherein the rotary core forward portion 110 and the annular boss 130 cooperate with the rotary casing 210. The annular boss 130 forms a thrust bearing component of the liquid metal plain bearing and cooperates with the rotating housing 210 to form a thrust surface. In addition, the rotary member 200 further includes a rotary flange 220 connected to the rotary housing 210, and the rotary flange 220 is disposed at a rear side of the rotary housing 210 along an axis of the liquid metal sliding bearing. And rotating flange 220 and annular boss 130 cooperate to form another thrust surface.

Alternatively, as shown in fig. 7, the at least one reservoir hole 133, 114, 115 includes a second reservoir hole 115 provided at a side surface of the front portion 110 of the rotary core. A plurality of second reservoir holes 115 may be provided on an outer side surface of the rotary core front 110. When the liquid metal leaks, the liquid metal in the reservoir chamber 113 may flow between the rotary core 100 and the rotary member 200 through the plurality of second reservoir holes 115 in the operating state of high-speed operation, thereby sufficiently supplementing the liquid metal of the radial bearing surface. The problem of unsmooth rotation caused by insufficient liquid metal is solved, and damage to the bearing caused by liquid metal leakage is effectively inhibited. And the technical problem that the influence of liquid metal leakage on the operation of the radial bearing is reduced when the bearing is started and stopped and works and operates in the prior art is not considered in the prior art is solved.

In addition, a plurality of second reservoir holes 115 may be uniformly distributed around the outer side surface of the rotary core 100 and respectively communicate with the corresponding reservoir cavities 113.

Alternatively, as shown in fig. 7, the at least one reservoir hole 133, 114, 115 includes a third reservoir hole 131 provided at a side surface of the annular boss 130. A plurality of third reservoir holes 131 are provided on the outer side surface of the annular boss 130. When the liquid metal leaks, in a working state of high-speed operation, the liquid metal in the reservoir chamber 113 may flow between the rotary core 100 and the rotary member 200 through the plurality of third reservoir holes 131, thereby sufficiently supplementing the liquid metal on the thrust bearing surface. The problem of unsmooth rotation caused by insufficient liquid metal is solved, and damage to the bearing caused by liquid metal leakage is effectively inhibited.

In addition, a plurality of third reservoir holes 131 may be uniformly distributed around the lateral surface of the annular boss 130, and respectively communicate with the corresponding reservoir cavities 113.

Further, for example, as shown in fig. 7, the same reservoir chamber 113 may be in communication with the first reservoir hole 114, the second reservoir hole 115, and the third reservoir hole 131, respectively. Thereby providing storage space for a plurality of liquid storage holes at the same time.

Alternatively, as shown with reference to fig. 7, the rotary core front part 110 of the rotary core 100 further includes: a first radial bearing portion 111, a second radial bearing portion 112, and a third sump 143, wherein the third sump 143 is disposed between the first radial bearing portion 111 and the second radial bearing portion 112, and the second sump hole 115 is disposed at an outer surface of the third sump 143. The third reservoir 143 is disposed between the first radial bearing portion 111 and the second radial bearing portion 112 to prevent the first radial bearing portion 111 and the second radial bearing portion 112 from interfering with each other in the operating state. And a plurality of third reservoir holes 113 are provided on an outer side surface of the third reservoir 143. When the liquid metal leaks, the liquid metal in the reservoir chamber 113 may flow between the rotary core 100 and the rotary member 200 through the plurality of second reservoir holes 115 in the operating state of high-speed operation, thereby sufficiently supplementing the liquid metal of the radial bearing surface. The problem of unsmooth rotation caused by insufficient liquid metal is solved, and damage to the bearing caused by liquid metal leakage is effectively inhibited. And the technical problem that the influence of liquid metal leakage on the operation of the radial bearing is reduced when the bearing is started and stopped and works and operates in the prior art is not considered in the prior art is solved.

Further, referring to fig. 7, the outer surfaces of the first radial bearing portion 111 and the second radial bearing portion 112 are provided with chevron-shaped or V-shaped grooves.

Alternatively, as shown with reference to FIG. 7, the at least one reservoir aperture 133, 114, 115 has an aperture diameter in the range of 3.5mm to 4.5 mm. Setting the hole diameters of the reservoir holes 133, 114, 115 to 3.5mm to 4.5mm can efficiently replenish the liquid metal between the rotary core 100 and the rotary member 200. And a plurality of reservoir holes 133, 114, 115 may be provided according to the diameter of the rotary core 100.

Optionally, the rotary core 100 further comprises: an annular boss 130 disposed between the rotary core front part 110 and the rotary core rear part 120; and at least one reservoir 141, 142 disposed at the root of the annular boss 130 where it connects to the rotary core 100, wherein the reservoirs 141, 142 are disposed around the axis of the rotary core 100.

Specifically, referring to fig. 7, an annular boss 130 (thrust bearing boss) is provided between the rotary core front portion 110 and the rotary core rear portion 120 of the liquid metal sliding bearing. Then at least one reservoir 141, 142 is provided at the root of the annular boss 130 where it joins the rotary core 100, wherein the reservoirs 141, 142 are arranged around the axis of the rotary core 100. So that in the event of a leakage of liquid metal between the rotary core 100 and the rotary member 200, the at least one reservoir 141, 142 may provide additional liquid metal for the thrust bearing boss or radial bearing. Therefore, the thrust bearing boss surface or the radial bearing surface is kept smooth and free from damage, and the service life of the liquid metal sliding bearing is ensured. And then solved the technical problem that the liquid metal among the prior art when the liquid metal emollient leaks from the bearing clearance, because the liquid metal in the middle of rotating assembly and the stator part reduces, cause the lubrication of bearing itself not smooth to can cause the damage to the bearing.

Alternatively, as shown with reference to fig. 7, the at least one sump 141, 142 comprises a first sump 141 disposed at the junction of the annular boss 130 and the rotary core front 110; and a second sump 142 provided at a junction of the annular boss 130 and the rotary core rear portion 120. The first reservoir 141, which is provided at the junction of the annular land 130 and the rotary core front portion 110, ensures adequate lubrication of the radial bearing and thrust bearing lands in the event of leakage of liquid metal between the rotary core 100 and the rotary member 200. And a second reservoir 142, disposed at the junction of the annular boss 130 and the rotary core rear portion 120, ensures adequate lubrication of the thrust bearing boss in the event of leakage of liquid metal between the rotary core 100 and the rotary member 200. Therefore, the bearing is prevented from being damaged through the first reservoir 141 and the second reservoir 142, and the service life of the liquid metal sliding bearing is ensured. And then solved the technical problem that the liquid metal among the prior art when the liquid metal emollient leaks from the bearing clearance, because the liquid metal in the middle of rotating assembly and the stator part reduces, cause the lubrication of bearing itself not smooth to can cause the damage to the bearing.

Further, referring to fig. 7, surfaces of the first radial bearing portion 111 and the second radial bearing portion 112 are provided with chevron-shaped or V-shaped grooves.

Alternatively, referring to fig. 1, the rotary member 200 further includes a rotary flange 220 connected to the rotary housing 210, and the rotary housing 210 and the rotary flange 220 are disposed along an axis of the liquid metal sliding bearing. The rotating flange 220 may be coupled to the rotating housing 210 through a screw hole. And the relative movement of the rotary housing 210 and the rotary core 100 is restricted by the rotary flange 220, thereby ensuring the normal operation of the liquid metal sliding bearing.

Alternatively, as shown with reference to fig. 1 and 7, the annular boss 130 includes a first thrust surface 131 abutting the rotating housing 210, and a second thrust surface 132 abutting the rotating flange 220. First and second thrust surfaces 131, 132, form the thrust bearing surfaces of the liquid metal sliding bearing.

Optionally, the inner surface of the rotating flange 220 is provided with at least one annular groove 2261, 2262 arranged around the axis of the liquid metal sliding bearing.

Specifically, referring to fig. 1, at least one annular groove 2261, 2262 is provided around the axis of the liquid metal sliding bearing at the inner surface of the rotating flange 220 of the liquid metal sliding bearing. The annular grooves 2261, 2262 may store a majority of the leaked liquid metal. Thus, in the case where the liquid metal flows along the rotating component toward the CT bulb, the annular grooves 2261, 2262 can store most of the leaked liquid metal, effectively blocking the liquid metal between the rotating core 100 and the rotating component 200 from leaking along the surface of the rotating core 100 into the vacuum space of the CT bulb. And the technical problems that the pressure resistance of the CT bulb tube is damaged and the safe operation of the bulb tube is directly influenced when liquid metal leaks to the vacuum inner wall of the bulb tube in the prior art are solved.

Alternatively, as shown in fig. 1 and 5, the at least one annular groove 2261, 2262 includes a fifth annular groove 2261 and a sixth annular groove 2262 disposed on an inside surface of the second bore portion 226 opposite the first liquid barrier ring 310. The inner side surface of the second bore portion 226 of the rotary flange 220 opposite to the first liquid blocking ring 310 is provided with a fourth annular groove 2261 and a fifth annular groove 2262, and then the inner side surface is matched with the first liquid blocking ring 310 to store a part of leaked liquid metal, so that the liquid metal is effectively prevented from being leaked into a vacuum space of the CT bulb along the surface of the rotary core 100.

Alternatively, referring to fig. 5 and 7, the first liquid baffle ring 310 includes a first connection portion 311 connected to the rotary core 100 and a first extension portion 312 extending forward from the first connection portion 311, wherein the first extension portion 312 is provided with a first annular groove 3121 toward an inner surface of the rotary core 100. A first annular groove 3121 is provided at the inner surface of the forwardly extending first extension 312 toward the rotary core 100, and most of the liquid metal leaking along the rotary core 100 is stored through the first annular groove 3121. Thereby effectively preventing the liquid metal from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100.

Alternatively, referring to fig. 1 and 6, the rotating member 200 further includes a rotating stator 230 connected to the rotating flange 220 for connecting with a magnetic element generating a driving force to rotate the liquid metal sliding bearing, and the rotating stator 230 is disposed at a rear side of the rotating flange 220 along an axis of the liquid metal sliding bearing, and wherein a second liquid blocking ring 320 is disposed at the rear side of the rotating stator 230; and the rotary stator 230 is provided with a seventh annular groove 234 near the inner surface of the rotary core 100. By adding the second liquid blocking ring 320 between the rotary stator 230 and the rotary core 100, the liquid metal can be effectively blocked from leaking into the vacuum space of the CT bulb along the surface of the rotary core 100 by the cooperation of the rotary stator 230 and the second liquid blocking ring 320 and by the storage of the liquid metal leaking from the seventh annular groove 234.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

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