阅读说明：本技术 阻尼电容器固定机构和换流阀阻尼电容器组及其安装方法 (Damping capacitor fixing mechanism, converter valve damping capacitor set and installation method thereof ) 是由 张民 张晓龙 陈争光 王华锋 王治翔 王成昊 于 2020-12-30 设计创作，主要内容包括：一种阻尼电容器固定机构和换流阀阻尼电容器组及其安装方法,阻尼电容器固定机构包括：电容器固定套,用于容置电容器,所述电容器通过卡接结构安装在所述电容器固定套内。通过上述电容器固定套从而对电容器进行固定,可以有效地解决现有技术中通过在圆柱体结构的电容器底部焊接紧固螺柱从而固定电容器的方式,其安装可靠性差,严重影响阻尼电容器使用寿命的问题。(A damping capacitor fixing mechanism, a converter valve damping capacitor group and an installation method thereof are provided, the damping capacitor fixing mechanism comprises: the capacitor fixing sleeve is used for accommodating a capacitor, and the capacitor is installed in the capacitor fixing sleeve through a clamping structure. Thereby fix the condenser through above-mentioned fixed cover of condenser, thereby can solve effectively among the prior art through the mode of the condenser bottom welding fastening stud fixed capacitor at the cylinder structure, its installation reliability is poor, seriously influences damping capacitor life's problem.)

1. A damping capacitor securing mechanism, comprising:

the capacitor fixing sleeve (1) is used for accommodating the capacitor (2), and the capacitor (2) is installed in the capacitor fixing sleeve (1) through a clamping structure.

2. The damping capacitor securing mechanism according to claim 1,

the capacitor fixing sleeve (1) comprises: the capacitor accommodating base is matched with the capacitor (2) in shape, and a zooming groove (3) is formed in the length direction of the capacitor accommodating base; the zooming groove (3) enables the outer peripheral wall of the capacitor accommodating base to be driven to perform telescopic action along the radial direction of the capacitor accommodating base so as to clamp the capacitor (2);

the clamping structure is a fastening hose clamp (4) sleeved on the capacitor accommodating base in the circumferential direction, and the fastening hose clamp (4) drives the capacitor accommodating base to clamp the capacitor (2).

3. The damping capacitor securing mechanism of claim 2,

the number of the zooming grooves (3) is at least two, and the zooming grooves (3) are arranged in the circumferential direction of the capacitor accommodating base; and/or the presence of a gas in the gas,

the capacitor accommodating base is made of a heat-conducting metal material; and/or the presence of a gas in the gas,

the fastening hose clamp (4) is made of metal.

4. The damping capacitor securing mechanism according to any one of claims 1 to 3, further comprising:

the capacitor fixing sleeve (1) is arranged on the insulation reinforcing plate (5); the insulating reinforcing plate (5) is provided with a strip-shaped hollow hole (6) used for blocking a discharge channel along the surface of the insulating reinforcing plate (5).

5. The damping capacitor fixing mechanism according to claim 4, characterized in that the capacitor fixing case (1) is provided at its side facing the insulation enhancing plate (5) with a metal pad (7) for raising the capacitor fixing case (1) to increase the creepage distance of the capacitor fixing case (1) and the insulation enhancing plate (5).

6. The damping capacitor securing mechanism according to claim 4,

the insulation reinforcing plate (5) is made of glass fiber reinforced resin; and/or the presence of a gas in the gas,

the insulation reinforcing plate (5) is provided with a fixing hole (8), and the capacitor accommodating base is in threaded fastening connection with the fixing hole (8) through a metal stud (9).

7. The damping capacitor securing mechanism according to claim 4, further comprising:

a capacitor support frame (10), the capacitor support frame (10) comprising: the insulation reinforcing plate comprises fixed cross beams (11), a supporting frame body (12) arranged between two adjacent fixed cross beams (11) and used for fixing the insulation reinforcing plate (5), and a connecting piece (13) used for connecting the fixed cross beams (11) and the supporting frame body (12);

the connecting piece (13) is a triangular metal connecting piece bent into a Z-shaped structure, and the triangular metal connecting piece is respectively connected with the fixed cross beam (11) and the supporting frame body (12) through insulating pieces.

8. The damping capacitor securing mechanism according to any one of claims 4 to 7,

the insulation reinforcing plate (5) is provided with at least two capacitor fixing sleeves (1), and an insulation gap is arranged between the adjacent capacitor fixing sleeves (1).

9. The damping capacitor fixing mechanism according to claim 1 or 2, wherein the capacitor fixing case (1) is a high thermal conductivity material and is further provided with heat radiation holes.

10. A converter valve damping capacitor bank, comprising:

a capacitor (2), and

the damping capacitor securing mechanism of any one of claims 1 to 9.

11. The converter valve damping capacitor bank of claim 10,

the surface of the capacitor (2) is coated with an epoxy resin high polymer material serving as an insulating medium; and/or the presence of a gas in the gas,

the capacitors (2) are arranged along the center line of the insulating reinforcing plate (5) in the length direction in a staggered mode, and the capacitors (2) correspond to thyristors in the thyristor press-fitting unit one by one.

12. A converter valve damping capacitor bank mounting method according to claim 10 or 11, characterized by comprising the steps of:

s1, installing the capacitor (2) in the capacitor fixing sleeve (1);

and S2, mounting the capacitor fixing sleeve (1) on the insulation reinforcing plate (5).

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a damping capacitor fixing mechanism, a converter valve damping capacitor bank and an installation method of the converter valve damping capacitor bank.

Background

The extra-high voltage direct current converter valve is core equipment of direct current transmission, and in the process that reverse recovery current of a thyristor of the converter valve is attenuated to 0 from a peak value, an induced overshoot voltage can be generated in leakage inductance of a converter transformer, and the induced overshoot voltage and base frequency voltage of the converter transformer are superposed and act on two ends of the thyristor together, so that reverse overvoltage breakdown of the thyristor can be caused. The overshoot voltage amplitude can be weakened by connecting the damping capacitors in parallel at the two ends of the thyristor, and the safe operation of the thyristor is ensured.

In the prior art, a capacitor is fixed by welding a fastening stud at the bottom of the capacitor with a cylindrical structure. However, since the outer shell of the capacitor is of a thin-walled structure, when a fastening connector is machined or welded on the outer shell of the capacitor, if the capacitor is influenced by external force action, such as external vibration excitation action, in the transportation process or the operation process, the problem of stress concentration at the connecting position of the stud and the thin shell is very easily caused, and thus the service life of the capacitor is shortened. Therefore, a fixing mechanism that can reliably fix the damping capacitor is lacking in the prior art.

Disclosure of Invention

Therefore, the invention aims to provide a damping capacitor fixing mechanism, a converter valve damping capacitor group and an installation method thereof, and aims to solve the problems that in the prior art, the installation reliability is poor and the service life of a damping capacitor is seriously influenced by a mode of welding a fastening stud at the bottom of a capacitor with a cylindrical structure to fix the capacitor. The application provides a damping capacitor fixed establishment includes:

the capacitor fixing sleeve is used for accommodating a capacitor, and the capacitor is installed in the capacitor fixing sleeve through a clamping structure.

Optionally, the capacitor securing sleeve comprises: the capacitor accommodating base is matched with the capacitor in shape, and a zooming groove is formed in the length direction of the capacitor accommodating base; the scaling groove enables the outer peripheral wall of the capacitor accommodating base to be driven to perform telescopic action along the radial direction of the capacitor accommodating base so as to clamp the capacitor;

the clamping structure is a fastening hose clamp sleeved on the capacitor accommodating base in the circumferential direction, and the fastening hose clamp drives the capacitor accommodating base to clamp the capacitor.

Optionally, the number of the zooming grooves is at least two, and at least two zooming grooves are arranged in the circumferential direction of the capacitor accommodating base; and/or the presence of a gas in the gas,

the capacitor accommodating base is made of a heat-conducting metal material; and/or the presence of a gas in the gas,

the fastening hose clamp is made of metal.

Optionally, the damping capacitor fixing mechanism further includes:

the capacitor fixing sleeve is arranged on the insulation reinforcing plate; and the insulating reinforcing plate is provided with a strip-shaped hollow hole for blocking a discharge channel on the surface of the insulating reinforcing plate.

Optionally, a metal pad used for heightening the capacitor fixing sleeve to increase creepage distance between the capacitor fixing sleeve and the insulation reinforcing plate is arranged on one side of the capacitor fixing sleeve facing the insulation reinforcing plate.

Optionally, the insulating reinforcing plate is made of glass fiber reinforced resin; and/or the presence of a gas in the gas,

the insulation reinforcing plate is provided with a fixing hole, and the capacitor accommodating base is in threaded fastening connection with the fixing hole through a metal stud.

Optionally, the damping capacitor fixing mechanism further includes:

a capacitor support frame, the capacitor support frame comprising: the insulating reinforcing plate comprises fixed cross beams, a supporting frame body and a connecting piece, wherein the supporting frame body is arranged between two adjacent fixed cross beams and used for fixing the insulating reinforcing plate, and the connecting piece is used for connecting the fixed cross beams and the supporting frame body;

the connecting piece is a triangular metal connecting piece bent into a Z-shaped structure, and the triangular metal connecting piece is respectively connected with the fixed cross beam and the supporting frame body through insulating pieces.

Optionally, at least two capacitor fixing sleeves are arranged on the insulation reinforcing plate, and an insulation gap is arranged between the adjacent capacitor fixing sleeves.

Optionally, the capacitor fixing sleeve is made of a high thermal conductivity material, and a heat dissipation hole is further formed in the capacitor fixing sleeve.

A converter valve damping capacitor bank comprising:

a capacitor, and

damping capacitor fixed establishment.

Optionally, the surface of the capacitor is coated with an epoxy resin polymer material as an insulating medium; and/or the presence of a gas in the gas,

the capacitors are arranged along the center line of the insulating reinforcing plate in the length direction in a staggered mode, and the capacitors correspond to the thyristors in the thyristor press-fitting unit one by one.

A converter valve damping capacitor bank installation method comprises the following steps:

s1, installing the capacitor in the capacitor fixing sleeve;

and S2, mounting the capacitor fixing sleeve on the insulation reinforcing plate.

The technical scheme of the invention has the following advantages:

1. the invention provides a damping capacitor fixing mechanism, comprising: the capacitor fixing sleeve is used for accommodating a capacitor, and the capacitor is installed in the capacitor fixing sleeve through a clamping structure.

The way to fix the capacitor in the prior art is: and welding a fastening stud at the bottom of the capacitor with a cylindrical structure so as to fix the capacitor at the mounting position through a threaded structure. However, since the outer shell of the capacitor is of a thin-walled structure, when a fastening connector is machined or welded on the outer shell of the capacitor, if the capacitor is influenced by external force action, such as external vibration excitation action, during transportation or operation, the problem of stress concentration at the connecting position of the stud and the thin shell is very easily caused. Therefore, the above-mentioned fixing method can seriously affect the reliability of the capacitor and reduce the service life of the capacitor. In order to solve the problems, the capacitor is clamped and fixed on the capacitor fixing sleeve, and then the capacitor is fixed at a specified mounting position through the capacitor fixing sleeve. The technical scheme provided by the invention does not need to fix the stud on the thin shell of the capacitor. And the thickness and the structure of the capacitor fixing sleeve are not limited by the capacitor structure, so that connecting pieces such as studs and the like can be firmly and reliably fixed on the capacitor fixing sleeve, the mounting strength of the capacitor fixing sleeve is ensured, and the problem that the fixing reliability of the capacitor is not enough in the transportation process or the operation process is solved.

2. The invention provides a damping capacitor fixing mechanism, which comprises: the capacitor accommodating base is matched with the capacitor in shape, and a zooming groove is formed in the length direction of the capacitor accommodating base; the scaling groove enables the outer peripheral wall of the capacitor accommodating base to be driven to perform telescopic action along the radial direction of the capacitor accommodating base so as to clamp the capacitor; the clamping structure is a fastening hose clamp sleeved on the capacitor accommodating base in the circumferential direction, and the fastening hose clamp drives the capacitor accommodating base to clamp the capacitor.

The capacitor can be guaranteed to be installed in the capacitor fixing sleeve through the zooming groove, and the capacitor fixing sleeve has certain flexibility in the radial direction, so that the capacitor can be effectively clamped and fixed in the tightening process of the fastening hose clamp. Moreover, by adopting the fastening form of the fastening hose clamp, the equipotential requirement between the suit base and the metal shell of the capacitor can be effectively ensured.

3. According to the damping capacitor fixing mechanism provided by the invention, the number of the zooming grooves is at least two, and the at least two zooming grooves are arranged in the circumferential direction of the capacitor accommodating base; the plurality of scaling grooves can effectively ensure that all parts of the capacitor fixing sleeve in the circumferential direction can be tightly attached and fixedly connected with the capacitor, and the capacitor can be firmly and reliably fixed.

4. According to the damping capacitor fixing mechanism provided by the invention, the capacitor accommodating base is made of a heat-conducting metal material; the fastening hose clamp is made of metal. Through setting up condenser holding base into the metal material that has higher heat conductivity, can also design the louvre simultaneously on its section of thick bamboo wall of condenser holding base, when guaranteeing mechanical strength, guarantee the radiating effect to the condenser.

5. The damping capacitor fixing mechanism provided by the invention further comprises: the capacitor fixing sleeve is arranged on the insulation reinforcing plate; and the insulating reinforcing plate is provided with a strip-shaped hollow hole for blocking a discharge channel on the surface of the insulating reinforcing plate.

Through set up bar fretwork hole on insulating reinforcing plate, the electric arc passageway of electric field direction can be blocked to the form of above-mentioned fretwork grooving to guarantee its electrical insulation performance of product. Moreover, the insulation reinforcing plate adopts glass fiber reinforced resin, so that structural strength can be provided for the capacitor bank, reliable installation strength is provided for the capacitor, and meanwhile, the electrical insulation property is ensured.

6. According to the damping capacitor fixing mechanism provided by the invention, one side of the capacitor fixing sleeve, which faces the insulation reinforcing plate, is provided with the metal pad which is used for heightening the capacitor fixing sleeve so as to increase the creepage distance between the capacitor fixing sleeve and the insulation reinforcing plate.

Through set up the metal pad in fixed cover bottom of condenser, can increase the creepage distance between fixed cover of condenser and the insulating reinforcing plate two-stage effectively to guarantee the security performance of capacitor bank.

7. According to the damping capacitor fixing mechanism provided by the invention, the insulation reinforcing plate is provided with the fixing hole, and the capacitor accommodating base is in threaded fastening connection with the fixing hole through the metal stud. The plurality of metal studs arranged on the capacitor accommodating base can be effectively and reliably fixed on the insulation reinforcing plate. The plurality of metal studs are positioned to ensure that the damping capacitor cannot shake in the height direction, and the connection strength of the capacitor accommodating base is ensured.

8. The damping capacitor fixing mechanism provided by the invention further comprises: a capacitor support frame, the capacitor support frame comprising: the insulating reinforcing plate comprises fixed cross beams, a supporting frame body and a connecting piece, wherein the supporting frame body is arranged between two adjacent fixed cross beams and used for fixing the insulating reinforcing plate, and the connecting piece is used for connecting the fixed cross beams and the supporting frame body; the connecting piece is a triangular metal connecting piece bent into a Z-shaped structure, and the triangular metal connecting piece is respectively connected with the fixed cross beam and the supporting frame body through insulating pieces.

The insulation reinforcing plate can be firmly and reliably supported and fixed by the supporting frame body. And the triangular metal connecting piece is fixedly arranged on the fixed cross beam through a metal bolt. Through the structure, stable mechanical support can be provided for the capacitor bank. Moreover, the fixed cross beam can be provided with a plurality of groups of supporting frame bodies according to actual needs, or simply and quickly adjust the installation position of the insulation reinforcing plate.

9. According to the damping capacitor fixing mechanism provided by the invention, at least two capacitor fixing sleeves are arranged on the insulation reinforcing plate, and an insulation gap is arranged between every two adjacent capacitor fixing sleeves. The insulation gap adopts air as an insulation medium, so that the insulation between the adjacent capacitor fixing sleeves is effectively ensured.

10. According to the damping capacitor fixing mechanism provided by the invention, the surface of the capacitor is coated with the epoxy resin high polymer material serving as an insulating medium. The problem of unreasonable voltage distribution caused by the complex voltage form acting in the composite insulation structure is effectively solved through the epoxy resin high polymer material and the insulation gap.

11. According to the converter valve damping capacitor bank provided by the invention, the capacitors are arranged along the central line of the insulating reinforcing plate in the length direction in a staggered manner, and the capacitors correspond to the thyristors in the thyristor press-fitting unit one by one.

Through the capacitors arranged in a staggered mode, the capacitors are connected with the thyristors in the thyristor press-fitting unit in a one-to-one corresponding matching mode, sufficient insulation distance can be guaranteed between the adjacent capacitors, and the safety performance of the capacitor bank is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic perspective view of a converter valve damping capacitor bank provided by the present invention;

FIG. 2 is a schematic view of a connection structure of the insulation-reinforcing plate and the capacitor support frame according to the present invention;

FIG. 3 is a schematic view of the connection of a capacitor and a capacitor mounting pouch provided in accordance with the present invention;

FIG. 4 is a schematic view of the assembly of a capacitor and capacitor retainer sleeve provided by the present invention;

fig. 5 is a schematic perspective view of a capacitor fixing sleeve according to the present invention;

FIG. 6 is a schematic view of the connection of the capacitor and the insulation-enhancing plate provided by the present invention;

fig. 7 is a top view of an insulation-enhancing sheet provided by the present invention.

Description of reference numerals:

1-capacitor fixation sleeves; 2-a capacitor; 3-a zoom groove; 4-fastening the hose clamp; 5-an insulation reinforcement plate; 6-strip-shaped hollow holes; 7-a metal pad; 8-a fixation hole; 9-a metal stud; 10-a capacitor support; 11-a fixed cross beam; 12-a support frame; 13-connecting piece.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

A damping capacitor securing mechanism, as shown in fig. 1 and 6, comprising:

as shown in fig. 3 to 5, the capacitor securing sleeve 1 is used for accommodating a capacitor 2, and the capacitor 2 is mounted in the capacitor securing sleeve 1 through a clamping structure; the capacitor securing pouch 1 comprises: the capacitor accommodating base is matched with the capacitor 2 in shape, and a zooming groove 3 is formed in the length direction of the capacitor accommodating base; the zooming groove 3 makes the outer peripheral wall of the capacitor accommodating base stretch and retract along the radial direction of the capacitor accommodating base under driving so as to clamp the capacitor 2; the capacitor 2 is clamped and fixed on the capacitor fixing sleeve 1, and the capacitor 2 is fixed at a specified mounting position through the capacitor fixing sleeve 1. The technical scheme provided by the invention does not need to fix the stud on the thin shell of the capacitor 2. Further, since the thickness and structure of the capacitor securing case 1 are not limited by the structure of the capacitor 2, the connecting member such as a stud can be securely and reliably secured to the capacitor securing case 1, thereby ensuring the mounting strength of the capacitor securing case 1. In this embodiment, the capacitor receiving base is made of a heat conductive metal material, and a heat dissipation hole is further formed thereon. Through setting up condenser holding base into the metal material that has higher heat conductivity, can also design the louvre simultaneously on its section of thick bamboo wall of condenser holding base, when guaranteeing mechanical strength, guarantee the radiating effect to condenser 2. In the present embodiment, the capacitor securing pouch 1 is provided at a side thereof facing the insulation reinforcement plate 5 with a metal pad 7 for heightening the capacitor securing pouch 1 to increase a creepage distance between the capacitor securing pouch 1 and the insulation reinforcement plate 5. The metal pad 7 can effectively increase the creepage distance between the two stages of the capacitor fixing sleeve 1 and the insulation reinforcing plate 5, thereby ensuring the safety performance of the capacitor bank; in this embodiment, at least two capacitor fixing sleeves 1 are disposed on the insulation reinforcing plate 5, and an insulation gap is disposed between adjacent capacitor fixing sleeves 1. The insulation gap adopts air as an insulation medium, so that the insulation between the adjacent capacitor fixing sleeves 1 is effectively ensured;

the fastening hose clamp 4 is made of metal and used for mounting the capacitor 2 in the capacitor fixing sleeve 1; wherein the number of the zooming grooves 3 is 6, and the zooming grooves 3 are uniformly arranged in the circumferential direction of the capacitor accommodating base. The clamping structure is a fastening hose clamp 4 sleeved on the capacitor accommodating base in the circumferential direction, and the fastening hose clamp 4 drives the capacitor accommodating base to clamp the capacitor 2; the plurality of scaling grooves 3 can effectively ensure that all parts of the capacitor fixing sleeve 1 in the circumferential direction can be tightly attached and fixedly connected with the capacitor 2, and the capacitor 2 can be firmly and reliably fixed;

an insulation reinforcing plate 5, wherein the insulation reinforcing plate 5 is made of glass fiber reinforced resin, as shown in fig. 2 and 7, the capacitor fixing sleeve 1 is mounted on the insulation reinforcing plate 5; the insulating reinforcing plate 5 is provided with a strip-shaped hollow hole 6 for blocking a discharge channel along the surface of the insulating reinforcing plate 5. Moreover, a fixing hole 8 is formed in the insulation reinforcing plate 5, and the capacitor accommodating base is in threaded fastening connection with the fixing hole 8 through a metal stud 9; through set up bar fretwork hole 6 on insulating reinforcing plate 5, the electric arc passageway of electric field direction can be blocked to the form of above-mentioned fretwork grooving to guarantee its electrical insulation performance of product. Moreover, the insulation reinforcing plate 5 is made of glass fiber or glass cloth reinforcing materials, so that structural strength can be provided for the capacitor bank, reliable installation strength is provided for the capacitor, and electrical insulation characteristics are guaranteed;

the capacitor support stand 10, as shown in fig. 2, 6 and 7, the capacitor support stand 10 includes: the insulation reinforcing plate comprises fixed cross beams 11, a supporting frame body 12 arranged between two adjacent fixed cross beams 11 and used for fixing the insulation reinforcing plate 5, and a connecting piece 13 used for connecting the fixed cross beams 11 and the supporting frame body 12; the connecting piece 13 is a triangular metal connecting piece bent into a Z-shaped structure, and the triangular metal connecting piece is connected with the fixed beam 11 and the supporting frame 12 through insulating pieces respectively.

A converter valve damping capacitor bank comprising:

the capacitor 2, the surface of the capacitor 2 is coated with epoxy resin high molecular material as insulating medium;

damping capacitor fixed establishment.

In the present embodiment, as shown in fig. 6, the capacitors 2 are arranged in a staggered manner along the center line of the insulating reinforcement plate 5 in the length direction thereof, and the capacitors 2 correspond to the thyristors in the thyristor press-fitting unit one by one.

A converter valve damping capacitor bank installation method comprises the following steps:

s1, installing the capacitor 2 in the capacitor fixing sleeve 1;

s2, the capacitor fixing case 1 is mounted on the insulation-reinforcing plate 5.

Certainly, the structure of the capacitor fixing sleeve 1 is not specifically limited in this embodiment, and in other embodiments, the capacitor fixing sleeve 1 may also be a cylindrical cavity that is matched with the shape of the capacitor 2 and is sleeved on the capacitor 2.

Of course, the structure of the clamping structure for connecting the capacitor 2 and the capacitor fixing sleeve 1 is not particularly limited in this embodiment, and in other embodiments, the capacitor 2 and the capacitor fixing sleeve 1 are fixedly connected by the hooks and the buckles respectively disposed on the two.

Of course, the number and arrangement of the zooming grooves 3 are not particularly limited in this embodiment, and in other embodiments, there are three zooming grooves 3, and the three zooming grooves 3 are arranged in the circumferential direction of the capacitor accommodating base and extend toward the length direction of the capacitor accommodating base.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.