Air conditioner

Abstract

The application discloses an air conditioner, comprising: a base; a compressor, the compressor comprising: a cylinder body and a bottom plate, the cylinder body being connected with the bottom plate, and the bottom plate being connected with the base; a connecting assembly, the connecting assembly being used for connecting the bottom plate with the base, and the connecting assembly comprising: a fixing piece and a torque limiting piece, the fixing piece being fixed on the base, and the torque limiting piece being arranged on the bottom plate and fixed with the fixing piece, so that when the bottom plate rotates relative to the base, the torque limiting piece limits the rotation of the bottom plate. When the bottom plate is counterclockwise twisted, the counterclockwise rotation of the bottom plate to the torque limiting piece in the counterclockwise direction with the fixing piece as the center, the pulling force of the fixing piece and the torque limiting piece in the clockwise direction according to the torque limiting characteristic of the fixing piece and the torque limiting piece, and the torque limiting piece being capable of bearing the force in two directions, the torque limiting characteristic can be fully utilized in the limited space to reduce the torque force generated when the compressor starts and stops, the rotation of the bottom plate is limited, the deformation amount of the pipe is reduced, the stress of the pipe when the compressor starts and stops is within a safe range, and the cracking risk of the pipe is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to an air conditioner. BACKGROUND

[0002] At present, the compressor of the air conditioner mostly adopts a single-cylinder rolling rotor compressor. When the compressor starts and stops, the crankshaft in the compressor suddenly starts and stops. The torque that suddenly adds or disappears is transmitted from the internal structure to the cylinder body, so that a torsional force is generated in the cylinder body.

[0003] In the related art, the cylinder body and the chassis are welded together, and the chassis is fixed by three bolt columns sleeved with rubber foot pads. The rubber foot pad and the bolt column have a certain gap in the radial direction. When the compressor starts and stops, the cylinder body and the chassis produce a sudden torsional action. Due to the deforming performance of the rubber foot pad and the existence of the gap, the compressor body and the liquid storage tank will produce a corresponding torsion. The pipe welded with the compressor exhaust port and the liquid storage tank return port will also swing in the tangent direction of the cylinder body axis line. This swing results in a much larger stress of the pipe at the start and stop time than at the running time, and often exceeds the enterprise internal control standard. The excessive stress of the compressor at the start and stop time easily leads to the risk of cracks in the weak parts such as welding and bending of the pipe. The rubber foot pad can buffer the inertial force of the entire constrained compressor pipe system at the start and stop time through its own deformation.

[0004] However, since the compression deformation of the rubber foot pad has a strong strain rate sensitivity, the corresponding compression strain rate is large under the condition of rapid compression, which will exhibit typical polymer viscoelastic properties. The corresponding actual deformation capacity of the rubber material decreases, the buffering effect of vibration, especially the instantaneous buffering effect, decreases. At the same time, in the limited deformation space, and the rubber material is less (thin wall thickness) at the actual acting position, only unilateral contact buffering, it cannot well limit the torsion and vibration isolation effect. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides an air conditioner which can reduce the torsional force generated when the compressor starts and stops, limit the rotation of the chassis, thereby reducing the deformation amount of the pipe fixed at both ends, so that the stress of the pipe at the start and stop of the compressor is within a safe range, and the cracking risk of the pipe is reduced.

[0006] The air conditioner according to the present application comprises a base, a compressor comprising a cylinder and a bottom plate, the cylinder being connected with the bottom plate, the bottom plate being connected with the base, a connecting assembly for connecting the bottom plate with the base, the connecting assembly comprising a fixing member and a torque limiting member, the fixing member being fixed on the base, the torque limiting member being arranged on the bottom plate and fixed with the fixing member, so that when the bottom plate rotates relative to the base, the torque limiting member limits the rotation of the bottom plate.

[0007] When the bottom plate is counterclockwise twisted, the bottom plate can be subjected to the force of the torque limiting member in the counterclockwise direction centered on the fixing member, specifically, the counterclockwise forward direction of the torque of the bottom plate is subjected to pressure, that is, the counterclockwise rotation of the bottom plate is subjected to the pressure of the torque limiting member, and the counterclockwise backward direction of the bottom plate is subjected to tension, that is, the tension of the fixing member and the torque limiting member in the clockwise direction, so that the torque limiting member can be subjected to tension and pressure in two directions and can hinder movement, and the torque limiting member can be fully utilized in limited space to reduce the torque generated when the compressor starts and stops, limit the rotation of the bottom plate, reduce the deformation of the pipe fixed at both ends, and make the stress of the pipe within a safe range when the compressor starts and stops, thereby reducing the risk of cracking of the pipe.

[0008] In some examples of the present application, the torque limiting member comprises a connecting portion and a torque limiting portion, the fixing member passes through the connecting portion and is fixed with the connecting portion, and the torque limiting portion is arranged on the circumference of the connecting portion and is connected with the bottom plate to limit the deformation of the force between the bottom plate and the connecting portion.

[0009] In some examples of the present application, the torque limiting portion comprises a bending segment and a vertical segment, the bending segment is connected between the connecting portion and the vertical segment and is arranged to bend in a horizontal plane, the bottom plate is provided with a mounting hole, and the vertical segment is arranged in the mounting hole.

[0010] In some examples of the present application, the bending segment comprises a first arc segment and a second arc segment, the first arc segment is connected between the connecting portion and one end of the second arc segment, the vertical segment is connected to the other end of the second arc segment, the first arc segment and the second arc segment are arranged to protrude in opposite directions, and the central angle corresponding to the second arc segment is greater than the central angle corresponding to the first arc segment.

[0011] In some examples of the present application, the fixing member comprises a fixing portion and a limiting portion, the fixing portion is fixed on the base and sequentially passes through the bottom plate and the torque limiting member, and the limiting portion is arranged above the torque limiting member and is limited in cooperation with the torque limiting member.

[0012] In some examples of the present application, the fixing part is a bolt, the limiting part is a nut, the bolt is provided with external threads, the nut is provided with internal threads, and the bolt and the nut are threadedly engaged.

[0013] In some examples of the present application, the fixing part is provided with a first clamping part, the limiting part is provided with a second clamping part, and the first clamping part and the second clamping part are clamped and engaged to limit in the circumferential direction and / or the axial direction.

[0014] In some examples of the present application, one of the first clamping part and the second clamping part is a clamping jaw, and the other is a clamping groove.

[0015] In some examples of the present application, the connecting assembly further comprises a damping member arranged between the base and the bottom plate.

[0016] In some examples of the present application, a plurality of connecting assemblies are arranged at intervals between the base and the bottom plate.

[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0019] Figure 1 is a partial cross-sectional view of a first embodiment of an air conditioner;

[0020] Figure 2 is Figure 1 is an enlarged view of part A in FIG. 4;

[0021] Figure 3 is a partial exploded view of the first embodiment of the air conditioner;

[0022] Figure 4 is a partial cross-sectional view of a second embodiment of an air conditioner;

[0023] Figure 5 is Figure 4 is an enlarged view of part B in FIG. 8;

[0024] Figure 6 is a partial exploded view of the second embodiment of the air conditioner;

[0025] Figure 7 is a structural schematic view of a torsion limiting member;

[0026] Figure 8 is a plan view of the torsion limiting member;

[0027] Figure 9 This is a schematic diagram of the fixing part in the second embodiment;

[0028] Figure 10 This is a schematic diagram of the limiting part in the second embodiment.

[0029] Figure label:

[0030] 1. Air conditioner;

[0031] 10. Base; 20. Compressor; 21. Cylinder; 22. Chassis; 220. Mounting hole; 30. Connecting assembly; 31. Fixing component; 310. Fixing part; 311. Limiting part; 312. First snap-fit ​​part; 313. Second snap-fit ​​part; 32. Torque limiting component; 320. Connecting part; 321. Torque limiting part; 322. Bending section; 323. Vertical section; 324. First arc-shaped section; 325. Second arc-shaped section; 33. Vibration damping component. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0033] The following is for reference. Figures 1-10 An air conditioner 1 according to an embodiment of the present invention is described.

[0034] like Figure 1 and Figure 4 As shown, the air conditioner 1 according to an embodiment of the present invention includes: a base 10, a compressor 20, and a connecting assembly 30. The base 10 is generally located at the bottom of the air conditioner 1, providing overall support. Some components of the air conditioner 1 can be mounted and fixed on the base 10, thus making the overall structure of the air conditioner 1 more stable. The compressor 20 compresses the refrigerant to form high-pressure refrigerant. The compressor 20 includes: a cylinder 21 and a chassis 22. The cylinder 21 is connected to the chassis 22, and the chassis 22 is connected to the base 10, thus fixing the compressor 20 as a whole, making the compressor 20 more stable and reliable, and ensuring its normal operation. The connecting assembly 30 is mainly used to connect the chassis 22 and the base 10. The compressor 20 can be fixedly connected to the base via the connecting assembly 30. The connecting assembly 30 also serves to limit torque; when the chassis 22 rotates relative to the base 10, the connecting assembly 30 can restrict the rotation of the chassis 22.

[0035] It should be noted that when the air conditioner 1 is started or stopped in the cooling mode or the heating mode, the compressor 20 is started or stopped, and in the top view, the crankshaft in the compressor 20 rotates counterclockwise from the static state. Due to the existence of inertia, the cylinder body 21 and the bottom plate 22 of the compressor 20 are maintained in the original position for a short time and then immediately rotate counterclockwise.

[0036] As shown in Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , the connecting assembly 30 includes a fixing member 31 and a torque limiting member 32. The fixing member 31 is fixed to the base 10, and the torque limiting member 32 is arranged on the bottom plate 22 and fixed to the fixing member 31 to limit the rotation of the bottom plate 22 relative to the base 10. That is, when the cylinder body 21 and the bottom plate 22 rotate counterclockwise, since the fixing member 31 is fixed to the base 10 and the torque limiting member 32 is arranged on the bottom plate 22 and fixed to the fixing member 31, the cylinder body 21 and the bottom plate 22 will be subjected to a force in the tangential clockwise direction from the fixing member 31 and the torque limiting member 32.

[0037] Specifically, when the bottom plate 22 is counterclockwise twisted, the bottom plate 22 can be subjected to a force of the torque limiting member 32 in the counterclockwise direction with the fixing member 31 as the center. Specifically, in the tangential direction of the axis of the cylinder body 21 and the axis of the hole in the fixed position of the bottom plate 22, the direction in which the bottom plate 22 is counterclockwise twisted forward is subjected to pressure, that is, the counterclockwise rotation of the bottom plate 22 exerts pressure on the torque limiting member 32, and the direction in which the bottom plate 22 counterclockwise retreats is subjected to tension, that is, the tension of the fixing member 31 and the torque limiting member 32 in the clockwise direction. Thus, the torque limiting member 32 can be subjected to tension and pressure in two directions and can play a role in hindering movement. In a limited space, the torque limiting characteristic of the torque limiting member 32 can be fully utilized to reduce the torque generated when the compressor 20 is started or stopped, limit the rotation of the bottom plate 22, and thus reduce the deformation of the pipes fixed at both ends, so that the stress of the pipes when the compressor 20 is started or stopped is within a safe range and the risk of cracking of the pipes is reduced. For example, the torque limiting member 32 can be a torque limiting spring. The torque limiting spring mainly generates a torque limiting characteristic through elastic deformation of the spring to reduce the torque generated when the compressor 20 is started or stopped.

[0038] According to an optional embodiment of the present application, as shown in Figure 2 、 Figure 5 、 Figure 7 and Figure 8As shown in the figure, the torsion limiting member 32 comprises a connecting portion 320 and a torsion limiting portion 321, the fixing member 31 passes through the connecting portion 320, and the fixing member 31 is fixed with the connecting portion 320. The torsion limiting portion 321 is arranged in the circumferential direction of the connecting portion 320, and the torsion limiting portion 321 is connected with the bottom plate 22 to limit the deformation of the bottom plate 22 and the connecting portion 320 under stress. The fixing member 31 passes through the connecting portion 320, and the fixing member 31 is fixed with the connecting portion 320. In this way, when the torsion limiting member 32 is subjected to the pressure of the bottom plate 22 in the counterclockwise direction, the fixing member 31 can provide a pulling force in the clockwise direction of the torsion limiting member 32, avoiding the torsion limiting member 32 from rotating with the bottom plate 22, and playing a role of limiting torsion. The torsion limiting portion 321 is arranged in the circumferential direction of the connecting portion 320, so that the connecting portion 320 and the torsion limiting portion 321 can be connected to form a whole, facilitating the installation and arrangement of the torsion limiting member 32. Moreover, after the torsion limiting portion 321 is connected with the bottom plate 22, when the torsion limiting member 32 is subjected to the pressure of the bottom plate 22 in the counterclockwise direction, the torsion limiting portion 321 can be deformed in the counterclockwise direction, and through the deformation of the torsion limiting portion 321, the rotation of the bottom plate 22 in the counterclockwise direction is limited, thereby reducing the deformation amount of the pipe fixed at both ends, and making the stress of the pipe within a safe range when the compressor 20 starts and stops.

[0039] As shown in the figures, Figure 3 , Figure 6 and Figure 7 , the torsion limiting portion 321 comprises a bending section 322 and a vertical section 323. The bending section 322 is connected between the connecting portion 320 and the vertical section 323, and the bending section 322 is arranged in a bending manner in the horizontal plane. The bottom plate 22 is provided with a mounting hole 220, and the vertical section 323 is arranged in the mounting hole 220. The bending section 322 is connected between the connecting portion 320 and the vertical section 323, so that the connecting portion 320, the bending section 322 and the vertical section 323 can be connected to form a whole, facilitating the installation and arrangement of the torsion limiting member 32. The bending section 322 is arranged in a bending manner in the horizontal plane, so that the bending section 322 can form a certain degree of torsion in the horizontal plane, thereby improving the torsion limiting performance of the bending section 322. When the torsion limiting portion 321 is deformed under stress, the bending section 322 can better limit the rotation of the bottom plate 22. The bottom plate 22 is provided with a mounting hole 220, and the vertical section 323 is arranged in the mounting hole 220, so as to improve the connection strength between the torsion limiting portion 321 and the bottom plate 22, thereby enabling the torsion limiting portion 321 to better act on the bottom plate 22.

[0040] Further, as shown in the figures, Figure 7 and Figure 8As shown, the bending section 322 comprises a first arc section 324 and a second arc section 325, the first arc section 324 is connected between the connecting section 320 and one end of the second arc section 325, the vertical section 323 is connected to the other end of the second arc section 325, the first arc section 324 and the second arc section 325 are convexly arranged towards opposite directions, and the central angle corresponding to the second arc section 325 is greater than the central angle corresponding to the first arc section 324.

[0041] Connecting the first arc section 324 between the connecting section 320 and one end of the second arc section 325, and connecting the vertical section 323 to the other end of the second arc section 325, can make the connecting section 320, the bending section 322 and the vertical section 323 connected as a whole, facilitating the installation and arrangement of the torsion limiting member 32. The first arc section 324 and the second arc section 325 are in arc structure, which can enhance the overall structural strength of the bending section 322 and prevent it from being damaged when the bending section 322 is stressed. The first arc section 324 and the second arc section 325 are convexly arranged towards opposite directions, which can improve the overall torsion degree of the bending section 322, thereby providing greater limiting force when the bending section 322 is deformed by stress, and better limiting the rotation of the chassis 22. The central angle corresponding to the second arc section 325 is greater than the central angle corresponding to the first arc section 324, that is, the bending degree of the first arc section 324 is less than the bending degree of the second arc section 325, so that the deformation degree of the first arc section 324 is smaller, which can improve the connection strength of the first arc section 324 and the connecting section 320, and the first arc section 324 is not easy to be broken from the connecting section 320 when stressed, while the second arc section 325 can generate torsion limiting effect through deformation, thereby better limiting the rotation of the chassis 22.

[0042] In addition, as shown in FIG. 2, the torsion limiting member 32 is arranged on the chassis 22, and the torsion limiting member 32 comprises a connecting section 320 and a bending section 322 connected to the connecting section 320. Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the fixing member 31 comprises a fixing part 310 and a limiting part 311, the fixing part 310 is fixed to the base 10, and the fixing part 310 is sequentially arranged through the bottom plate 22 and the limiting member 32, the limiting part 311 is arranged above the limiting member 32, and the limiting part 311 is in limiting cooperation with the limiting member 32. The fixing part 310 is fixed to the base 10, and the fixing part 310 is sequentially arranged through the bottom plate 22 and the limiting member 32, and the fixing part 310 can be fixed with the limiting part 311, so that when the limiting member 32 is subjected to the pressure of the bottom plate 22 in the counterclockwise direction, the fixing member 31 can provide the limiting member 32 with a pulling force in the clockwise direction through the base 10, so as to avoid the limiting member 32 from rotating together with the bottom plate 22, thereby playing a role of limiting the rotation. The limiting part 311 is arranged above the limiting member 32, so that the limiting part 311 and the limiting member 32 can be in limiting cooperation, so as to limit the movement of the limiting member 32 in the axial direction, thereby making the arrangement of the limiting member 32 more stable and reliable, and limiting the overall movement of the compressor 20 in the axial direction, thereby making the arrangement of the compressor 20 more stable and reliable, and enabling the compressor 20 to work stably.

[0043] Optionally, as shown in Figure 2 , and Figure 3 As shown, the fixing part 310 is a bolt, and the limiting part 311 is a nut, the bolt is provided with external threads, the nut is provided with internal threads, and the bolt and the nut are in threaded cooperation. The fixing part 310 can be arranged as a bolt, and the limiting part 311 can be arranged as a nut. The bolt is provided with external threads, and the nut is provided with internal threads. Through the threaded cooperation between the bolt and the nut, the cooperation between the fixing part 310 and the limiting part 311 can be more stable and firm, thereby enabling the limiting part 311 to better limit the limiting member 32, and limiting the movement of the limiting member 32 and the compressor 20 in the axial direction.

[0044] Optionally, as shown in Figure 5 , Figure 6 , Figure 9 and Figure 10As shown, the fixing part 310 is provided with a first clamping part 312, and the limiting part 311 is provided with a second clamping part 313. The first clamping part 312 and the second clamping part 313 are clamped and matched to limit in the circumferential direction and / or the axial direction. The first clamping part 312 can also be provided on the fixing part 310, and the second clamping part 313 can be provided on the limiting part 311. The clamping and matching between the first clamping part 312 and the second clamping part 313 can make the fixing part 310 and the limiting part 311 match firmly, so as to limit the limiting part 311 in the circumferential direction and / or the axial direction, and better limit the limiting part 311 to limit the movement of the limiting torsion piece 32 and the compressor 20 in the axial direction. In addition, the clamping mode between the first clamping part 312 and the second clamping part 313 can make the installation of the fixing part 310 and the limiting part 311 more simple and convenient, so as to improve the assembly efficiency.

[0045] Specifically, as shown in Figure 5 , Figure 6 , Figure 9 and Figure 10 , one of the first clamping part 312 and the second clamping part 313 is a clamping jaw, and the other is a clamping groove. One of the first clamping part 312 and the second clamping part 313 is a clamping jaw, and the other is a clamping groove. The structure of the clamping jaw and the clamping groove is simpler, which is convenient for manufacturing and reduces the cost. Moreover, the matching of the clamping jaw and the clamping groove is more simple and convenient, which can improve the assembly efficiency.

[0046] In addition, as shown in Figure 2 , Figure 3 , Figure 5 and Figure 6 , the connecting assembly 30 further comprises a damping piece 33 arranged between the base 10 and the bottom plate 22. The damping piece 33 arranged between the base 10 and the bottom plate 22 can support the base 10 and the bottom plate 22, and the damping piece 33 can buffer the vibration of the compressor 20 in the axial direction to a certain extent, so as to ensure the stability of the compressor 20 arranged in the axial direction.

[0047] Of course, as shown in Figure 3 and Figure 6As shown, the connecting assembly 30 is multiple, and the multiple connecting assemblies 30 are arranged at intervals between the base 10 and the bottom plate 22. By arranging multiple connecting assemblies 30 and arranging the multiple connecting assemblies 30 at intervals between the base 10 and the bottom plate 22, not only can interference between the multiple connecting assemblies 30 be avoided, but also the distribution range of the multiple connecting assemblies 30 can be wider, so that the torsion limiting effect of the connecting assembly 30 between the base 10 and the bottom plate 22 can be improved, the rotation of the bottom plate 22 is further limited, the deformation amount of the pipe fixed at both ends is reduced, the stress of the pipe during start and stop of the compressor 20 is within a safe range, and the cracking risk of the pipe is reduced.

[0048] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In the description of the present application, "first feature" and "second feature" can include one or more features. In the description of the present application, "multiple" means two or more. In the description of the present application, "above" or "below" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature therebetween. In the description of the present application, "above", "over" and "on" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height.

[0050] In the description of the present application, the description referring to the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example.

[0051] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An air conditioner characterized by comprising: The utility model relates to a compressor base and connecting assembly, and belongs to the field of compressor base and connecting assembly. The utility model discloses a compressor base and connecting assembly, which comprises a base, a compressor, a connecting assembly, wherein the compressor comprises a cylinder and a bottom plate, the cylinder is connected with the bottom plate, and the bottom plate is connected with the base. The connecting assembly is used for connecting the bottom plate with the base, and comprises a fixing part and a torque limiting part. The fixing part is fixed on the base, and the torque limiting part is arranged on the bottom plate and fixed with the fixing part. When the bottom plate rotates relative to the base, the torque limiting part limits the rotation of the bottom plate. The torque limiting part comprises a connecting part and a torque limiting part. The fixing part penetrates the connecting part and is fixed with the connecting part.

2. The air conditioner of claim 1, wherein The torque limiting part is arranged in the circumferential direction of the connecting part and is connected with the bottom plate.

3. The air conditioner of claim 2, wherein When the bottom plate and the connecting part are deformed under force, the torque limiting part is limited.

4. The air conditioner of claim 2, wherein The torque limiting part comprises a bending segment and a vertical segment.

5. The air conditioner of claim 4, wherein The bottom plate is provided with a mounting hole, and the vertical segment is arranged in the mounting hole.

6. The air conditioner of claim 1, wherein The bending segment comprises a first arc segment and a second arc segment.

7. The air conditioner of claim 1, wherein The first arc segment is connected between the connecting part and one end of the second arc segment. The vertical segment is connected to the other end of the second arc segment. The first arc segment and the second arc segment are convexly arranged in opposite directions. The second arc segment corresponds to a central angle greater than that of the first arc segment. The fixing part comprises a fixing part and a limiting part. The fixing part is fixed on the base and penetrates the bottom plate and the torque limiting part in sequence. The limiting part is arranged above the torque limiting part and is limited in cooperation with the torque limiting part. The fixing part is a bolt, and the limiting part is a nut. The bolt is provided with external threads, and the nut is provided with internal threads. The fixing part is provided with a first clamping part, and the limiting part is provided with a second clamping part. The first clamping part and the second clamping part are clamped and matched in circumferential and / or axial direction. One of the first clamping part and the second clamping part is a clamping jaw, and the other is a clamping groove. The connecting assembly further comprises a damping part arranged between the base and the bottom plate. The connecting assembly is a plurality of connecting assemblies arranged in the circumferential direction of the base and the bottom plate.

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