Fixed structure and compressor

Abstract

This utility model discloses a fixing structure and a compressor, relating to the field of compressor technology. The fixing structure includes a main body and a plug-in part. The main body has a corresponding receiving end and a fixed end, and the main body is provided with a mounting hole penetrating the receiving end and the fixed end. The plug-in part is inserted into the mounting hole of the main body, and the fixed end of the main body can at least partially deform in the radial direction along the mounting hole. By setting the main body and providing the mounting hole, the plug-in part can be inserted into the main body. Through the insertion and removal of the plug-in part, the fixed end of the main body can deform in the radial direction along the mounting hole to cooperate with the corresponding connecting hole on the housing to fix the sealing plug to the housing, and the fixing of the sealing plug can be released, allowing the user to directly pull out the sealing plug. This makes disassembly and assembly convenient, thereby solving the problem of inconvenient disassembly and assembly of existing sealing plugs.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a fixed structure and compressor. Background Technology

[0002] Currently, compressors require sealing of their intake and exhaust ports during transportation to prevent leakage of refrigerant oil. Existing sealing plugs are typically fixed to the compressor housing with screws. During installation, the sealing plug is first inserted into the compressor's intake and exhaust ports, and then screws are inserted into the screw holes in the compressor housing through the open holes of the sealing plug to tighten it. Disassembly requires loosening the screws and then pulling out the sealing plug using a pull plate. However, this method of fixing is cumbersome and not conducive to quick removal of the sealing plug. Utility Model Content

[0003] The main purpose of this utility model is to propose a fixed structure and compressor, which aims to solve the problem of inconvenient disassembly and assembly of existing sealing plugs.

[0004] To achieve the above objectives, the present invention proposes a fixing structure for a compressor, the fixing structure comprising:

[0005] The main body has a corresponding socket end and a fixed end, and the main body is provided with a mounting hole penetrating the socket end and the fixed end; and,

[0006] The insertion part is inserted into the mounting hole of the main body, and the fixed end of the main body is at least partially deformable in the radial direction along the mounting hole.

[0007] In one embodiment, at least one of the mounting hole and the plug-in portion has a gradually changing cross-section along its length direction.

[0008] In one embodiment, the diameter of at least a portion of the mounting hole is tapered in the direction from the socket end toward the fixed end; and / or,

[0009] The outer diameter of at least one segment of the insertion / removal portion gradually widens in the direction from the socket end toward the fixed end.

[0010] In one embodiment, the side of the fixed end of the main body is provided with a cut that can communicate with the mounting hole, and the cut is provided to laterally penetrate the end face of the fixed end.

[0011] In one embodiment, multiple cuts are provided, and the multiple cuts are spaced apart circumferentially along the main body.

[0012] In one embodiment, the outer surface of the fixed end of the main body is provided with external threads.

[0013] In one embodiment, the outer side of the main body is provided with a first limiting portion for abutting against the compressor housing; and / or,

[0014] The outer side of the insertion part is provided with a second limiting part, which abuts against the insertion end of the main body.

[0015] In one embodiment, the outer surface of the main body is stepped to form a first limiting step surface, and the first limiting portion includes the first limiting step surface; and / or,

[0016] The outer side of the insertion / removal part is stepped to form a second limiting step surface, and the second limiting part includes the second limiting step surface.

[0017] In one embodiment, one end of the insertion / extraction portion is provided with a connecting portion for connecting the pull-out member.

[0018] In addition, this utility model also proposes a compressor, comprising:

[0019] A housing and a sealing plug, wherein the housing and the sealing plug are respectively provided with a first connecting hole and a second connecting hole, the housing is also provided with an air intake port and an air exhaust port, and the sealing plug is provided at the air intake port and / or the air exhaust port; and...

[0020] The fixing structure includes the fixing structure described above, wherein the main body of the fixing structure passes through the first connecting hole and the second connecting hole.

[0021] In one embodiment, the first connecting hole is provided with an internal thread, and the outer side of the main body of the fixing structure is provided with an external thread, and the main body of the fixing structure is threadedly installed in the first connecting hole.

[0022] In one embodiment, on any cross-section, the diameter of the mounting hole of the main body is D1, the outer diameter of the plug-in part of the fixing structure is D2, the major diameter of the thread of the main body is M1, the major diameter of the thread of the first connecting hole is M2, and the minor diameter of the thread of the first connecting hole is M3, wherein M1+(D2-D1)>(M2+M3) / 2.

[0023] In the technical solution of this utility model, during installation, the plug-in part is inserted into the mounting hole, causing the fixed end of the main body to deform radially along the mounting hole to form an interference fit with the corresponding connecting hole on the housing, thereby fixing the sealing plug to the housing. During disassembly, the plug-in part is pulled out of the mounting hole to release the sealing plug from its fixation, allowing the sealing plug to be pulled out. Thus, by setting the main body and the mounting hole, the plug-in part can be inserted into the main body. Through the insertion and removal of the plug-in part, the fixed end of the main body can deform radially along the mounting hole to fit with the corresponding connecting hole on the housing, thereby fixing the sealing plug to the housing, and the fixing of the sealing plug can also be released, allowing the user to directly pull out the sealing plug. This convenient disassembly and assembly solves the problem of inconvenient disassembly and assembly of existing sealing plugs. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the main body of the fixing structure provided by this utility model;

[0026] Figure 2 for Figure 1 A cross-sectional structural diagram of the main body of the structure;

[0027] Figure 3 A three-dimensional structural diagram of the insertion / removal part of the fixing structure provided by this utility model;

[0028] Figure 4 A three-dimensional structural diagram of the sealing plug provided by this utility model;

[0029] Figure 5 A partial structural schematic diagram of the compressor provided by this utility model.

[0030] Explanation of icon numbers:

[0031] 100. Fixed structure; 1. Main body; 11. Socket end; 12. Fixed end; 13. Mounting hole; 14. Cutout; 15. First limiting part; 151. First limiting step surface; 2. Insertion / removal part; 21. Second limiting part; 211. Second limiting step surface; 3. Connecting part; 4. External thread;

[0032] 200. Sealing plug; 210. Second connecting hole;

[0033] 1000, Compressor; 300, Housing; 310, First connecting hole; 320, Inlet.

[0034] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0036] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0037] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0038] Currently, compressors require sealing of their intake and exhaust ports during transportation to prevent leakage of refrigerant oil. Existing sealing plugs are typically fixed to the compressor housing with screws. During installation, the sealing plug is first inserted into the compressor's intake and exhaust ports, and then screws are inserted into the screw holes in the compressor housing through the open holes of the sealing plug to tighten it. Disassembly requires loosening the screws and then pulling out the sealing plug using a pull plate. However, this method of fixing is cumbersome and not conducive to quick removal of the sealing plug.

[0039] Based on this, this utility model proposes a fixing structure for compressors, aiming to solve the problem of inconvenient disassembly and assembly of existing sealing plugs. Among them, Figures 1 to 3 A schematic diagram of the fixing structure provided by this utility model; Figure 4 A schematic diagram of the structure of the sealing plug provided by this utility model; Figure 5 A schematic diagram of the compressor provided by this utility model.

[0040] Please see Figures 1 to 3 In one embodiment of the present invention, the fixing structure 100 includes a main body 1 and an insertion / extraction part 2. The main body 1 has a receiving end 11 and a fixing end 12, and the main body 1 is provided with a mounting hole 13 that passes through the receiving end 11 and the fixing end 12. The insertion / extraction part 2 is inserted into the mounting hole 13 of the main body 1, and the fixing end 12 of the main body 1 is at least partially able to deform in the radial direction along the mounting hole 13.

[0041] It should be noted that the main body 1 needs to have a certain degree of toughness so that it can deform radially along the mounting hole 13. It can be made of various materials, such as plastic or rubber, as long as it can deform radially along the mounting hole 13. This invention does not limit this. The main body 1 can also have various shapes, such as circular or polygonal, and this invention does not limit this.

[0042] The insertion / removal part 2 is mainly used to deform the fixed end 12, requiring a certain degree of hardness and strength. It can be made of various materials, such as metals like iron and steel, inorganic non-metals like ceramics, or polymers like plastics, as long as they meet the strength and hardness requirements. This invention does not limit its application in this regard. Furthermore, the insertion / removal part 2 can have various shapes, such as circular or polygonal. This invention does not limit its application in this regard. Moreover, the shape of the insertion / removal part 2 should match the shape of the mounting hole 13 to ensure the fastening effect of the fixing structure 100.

[0043] In the technical solution of this utility model, during installation, the plug-in part 2 is inserted into the mounting hole 13, so that the fixed end 12 of the main body 1 changes shape radially along the mounting hole 13 to form an interference fit with the corresponding connecting hole on the housing, thereby fixing the sealing plug 200 to the housing. During disassembly, the plug-in part 2 is pulled out of the mounting hole 13 to release the fixing of the sealing plug 200, and the sealing plug 200 can be pulled out. Thus, by setting the main body 1 and the mounting hole 13, the plug-in part 2 can be inserted into the main body 1. Through the insertion and removal of the plug-in part 2, the fixed end 12 of the main body 1 can change shape radially along the mounting hole 13 to fit with the corresponding connecting hole on the housing to fix the sealing plug 200 to the housing, and the fixing of the sealing plug 200 can be released, so that the user can directly pull out the sealing plug 200. The disassembly and assembly are convenient, thereby solving the problem of inconvenient disassembly and assembly of the existing sealing plug 200.

[0044] In one embodiment of this utility model, please refer to Figure 2 and Figure 3 At least one of the mounting hole 13 and the insertion part 2 has a cross-section that is gradually changed along its length direction. Thus, the cross-section of at least one segment of the mounting hole 13 or the insertion part 2 is gradually changed so that the outer diameter of the insertion part 2 is gradually larger than the diameter of the mounting hole 13, so that when the insertion part 2 is inserted into the mounting hole 13, the main body 1 gradually changes shape along the radial direction of the mounting hole 13.

[0045] It should be noted that, in the context of the mounting hole 13 and the insertion / extraction part 2 having a gradually changing cross-section, the cross-section of the mounting hole 13 or the insertion / extraction part 2 is either gradually narrowing or gradually expanding along the length of the mounting hole 13. For example, the mounting hole 13 may be gradually narrowing while the insertion / extraction part 2 has a constant cross-section, or the insertion / extraction part 2 may be gradually expanding while the mounting hole 13 has a constant cross-section, or the mounting hole 13 may be gradually narrowing while the insertion / extraction part 2 has gradually expanding, etc. This utility model does not limit the specific design.

[0046] In order to enable the insertion / removal part 2 to deform the fixed end 12 outwards, in one embodiment of this utility model, please refer to... Figure 2 In the direction from the socket end 11 toward the fixed end 12, the diameter of at least a section of the mounting hole 13 is gradually reduced. Thus, the mounting hole 13 is gradually reduced so that the diameter of the mounting hole 13 is smaller than the outer diameter of the insertion part 2, so that when the insertion part 2 is inserted into the mounting hole 13, the insertion part 2 can drive the fixed end 12 to deform radially along the mounting hole 13.

[0047] It should be noted that there are various ways in which the diameter of the mounting hole 13 is gradually reduced. It can be that the middle part of the mounting hole 13 is gradually reduced, or that the mounting hole 13 at the fixed end 12 is gradually reduced, or that the entire mounting hole 13 is gradually reduced, etc. This utility model does not limit this.

[0048] In another embodiment of this utility model, please refer to Figure 3 In the direction from the socket end 11 toward the fixed end 12, the outer diameter of at least a section of the insertion part 2 is gradually widened. Thus, the insertion part 2 is gradually widened so that the outer diameter of the insertion part 2 is larger than the diameter of the mounting hole 13, so that when the insertion part 2 is inserted into the mounting hole 13, the insertion part 2 can drive the fixed end 12 to deform radially along the mounting hole 13.

[0049] It should be noted that there are various ways in which the outer diameter of the plug-in part 2 is gradually widened. For example, the middle part of the plug-in part 2 can be gradually widened, the plug-in part 2 corresponding to the fixed end 12 can be gradually widened, or the entire plug-in part 2 can be gradually widened, etc. This utility model does not limit this.

[0050] It should also be noted that the two related technical features mentioned above, namely, "the diameter of at least part of the mounting hole 13 is gradually decreasing" and "the outer diameter of at least part of the insertion part 2 is gradually increasing", can be set either one or both, and this utility model does not limit them.

[0051] In one embodiment of this utility model, please refer to Figure 1 and Figure 2 The side of the fixed end 12 of the main body 1 is provided with a cutout 14 that can communicate with the mounting hole 13. The cutout 14 is provided to penetrate the end face of the fixed end 12. In this way, by providing the cutout 14, the main body 1 is divided so that after the insertion part 2 is inserted into the mounting hole 13, the main body 1 can deform radially along the mounting hole 13 so that the main body 1 can form an interference fit with the corresponding connecting hole on the housing.

[0052] Furthermore, multiple cuts 14 are provided, and the multiple cuts 14 are spaced apart along the circumference of the main body 1. In this way, by providing multiple cuts 14, the strength of the fixed end 12 is reduced, so that the fixed end 12 is more easily deformed, so that it can deform radially along the mounting hole 13 under the drive of the insertion and extraction part 2.

[0053] In one embodiment of the present invention, the outer side of the fixing end 12 of the main body 1 is provided with an external thread 4. In this way, by providing the external thread 4 to cooperate with the internal thread in the corresponding connecting hole, the friction between the main body 1 and the connecting hole is increased, thereby helping to improve the fastening effect of the fixing structure 100.

[0054] In one embodiment of this utility model, please refer to Figure 2 The outer side of the main body 1 is provided with a first limiting part 15 for abutting against the housing of the compressor 1000. In this way, by setting the first limiting part 15 to abut against the housing, the insertion depth of the main body 1 is limited, so as to prevent the main body 1 from being difficult to pull out due to excessive insertion, which would affect subsequent disassembly.

[0055] In one embodiment of this utility model, please refer to Figure 3 The outer side of the insertion part 2 is provided with a second limiting part 21, which abuts against the receiving end 11 of the main body part 1. In this way, by providing the second limiting part 21 to abut against the receiving end 11, the insertion depth of the insertion part 2 is limited, so as to prevent the insertion part 2 from being difficult to pull out due to excessive insertion, which would affect subsequent disassembly.

[0056] It should be noted that the two related technical features mentioned above, namely, "the outer side of the main body 1 is provided with a first limiting part 15" and "the outer side of the insertion part 2 is provided with a second limiting part 21", can be set either one or both. Obviously, setting both at the same time is more effective.

[0057] Further, in one embodiment, please refer to Figure 2 The outer surface of the main body 1 is stepped to form a first limiting step surface 151. The first limiting part 15 includes the first limiting step surface 151. Thus, by setting the first limiting step surface 151, the insertion depth of the main body 1 can be positioned, which can both limit the insertion depth of the main body 1 to prevent it from being inserted too deeply and avoid the main body 1 not being inserted in place, thus affecting the fixing effect of the fixing structure 100. Of course, in other embodiments, the first limiting part 15 may also be a positioning protrusion on the outer surface of the main body 1, etc., and this utility model does not limit it in this way.

[0058] In another embodiment, please refer to Figure 3The outer surface of the insertion / removal part 2 is stepped to form a second limiting step surface 211. The second limiting part 21 includes the second limiting step surface 211. Thus, by setting the second limiting step surface 211, the insertion depth of the insertion / removal part 2 can be positioned, which can both limit the insertion depth of the insertion / removal part 2 to prevent it from being inserted too deeply and avoid it being inserted incompletely, thus affecting the fixing effect of the fixing structure 100. Of course, in other embodiments, the second limiting part 21 can also be a positioning protrusion or the like on the outer surface of the insertion / removal part 2; this utility model does not limit this.

[0059] It should be noted that the two related technical features mentioned above, namely, "the outer side of the main body 1 is stepped to form a first limiting step surface 151" and "the outer side of the insertion part 2 is stepped to form a second limiting step surface 211", can be set either one or both, and this utility model does not limit them.

[0060] To facilitate the user in removing the plug-in part 2, in one embodiment of this utility model, please refer to... Figure 3 One end of the plug-in part 2 is provided with a connecting part 3 for connecting the puller. Thus, by providing the connecting part 3 to connect the puller, it is convenient for the user to operate the puller to pull the plug-in part 2 out of the mounting hole 13, thereby making it easy for the user to remove the fixing structure 100.

[0061] It should be noted that the connecting part 3 can be a connecting hole, a connecting rib, etc., as long as it is convenient to connect the pull-out part. This utility model does not limit this.

[0062] This utility model also proposes a compressor 1000, please refer to [link / reference needed]. Figure 1 , Figure 4 and Figure 5 The compressor 1000 includes a housing 300, a sealing plug 200, and a fixing structure 100. The housing 300 and the sealing plug 200 are respectively provided with a first connecting hole 310 and a second connecting hole 210. The housing 300 is provided with an air intake (320) and an exhaust port. The sealing plug 200 is provided at the air intake 320 and / or the exhaust port. The main body 1 of the fixing structure 100 passes through the first connecting hole 310 and the second connecting hole 210.

[0063] In this embodiment, when it is necessary to fix the sealing plug 200 to the housing 300, first insert the main body 1 into the first connecting hole 310 and the second connecting hole 210, and then insert the plug-in part 2 of the fixing structure 100 into the mounting hole 13 of the main body 1, so that the main body 1 deforms outward to form an interference fit with the first connecting hole 310, thereby fastening the sealing plug 200 to the housing 300. When it is necessary to remove the sealing plug 200, the plug-in part is pulled out one after the other. By inserting or removing part 2 and the main body part 1, the fastening of the sealing plug 200 and the housing 300 can be released, allowing the user to pull out the sealing plug 200. Thus, by inserting or removing part 2, the main body part 1 can be deformed radially along the mounting hole 13 to form an interference fit with the first connecting hole 310 to fix the sealing plug 200 to the housing 300, and the fastening of the sealing plug 200 can be released, allowing the user to directly pull out the mounting part, making disassembly and assembly convenient.

[0064] It should be noted that the specific structure of the fixed structure 100 refers to the above embodiments. Since the compressor 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0065] In one embodiment of this utility model, please refer to Figure 1 and Figure 5 The first connecting hole 310 is provided with an internal thread, and the outer side of the main body 1 of the fixing structure 100 is provided with an external thread 4. The main body 1 of the fixing structure 100 is threadedly installed in the first connecting hole 310. In this way, by setting the mutually cooperating external thread 4 and the internal thread, the friction between the main body 1 and the first connecting hole 310 is increased, thereby helping to improve the fastening effect of the fixing structure 100.

[0066] Furthermore, on the same cross-section, the diameter of the mounting hole 13 of the main body 1 is D1, the outer diameter of the insertion / extraction part 2 of the fixing structure 100 is D2, the major diameter of the thread of the main body 1 is M1, the major diameter of the thread of the first connecting hole 310 is M2, and the minor diameter of the thread of the first connecting hole 310 is M3, wherein M1+(D2-D1)>(M2+M3) / 2, so that the external thread 4 and the internal thread at least partially overlap, reducing the probability of the external thread 4 separating from the internal thread, thereby helping to ensure the fastening effect of the fixing structure 100.

[0067] It should be noted that the major diameter of the thread of the main body 1 refers to the diameter of the top of the thread of the main body 1, the major diameter of the thread of the first connecting hole 310 refers to the diameter of the bottom of the thread of the first connecting hole 310 (i.e., the maximum diameter of the hole), which is the diameter at the widest point of the thread, and the minor diameter of the thread of the first connecting hole 310 refers to the diameter of the top of the thread of the first connecting hole 310 (i.e., the minimum diameter of the hole), which is the diameter at the narrowest point of the thread.

[0068] The compressor 1000 can be of various types. In this embodiment, the compressor includes a scroll compressor. Of course, in other embodiments, it can also be a piston compressor or a centrifugal compressor, etc., and this utility model does not limit it in this way.

[0069] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A fixed structure for a compressor, characterized in that, The fixing structure includes: The main body has a corresponding socket end and a fixed end, and the main body is provided with a mounting hole penetrating the socket end and the fixed end; and, The insertion part is inserted into the mounting hole of the main body, and the fixed end of the main body is at least partially deformable in the radial direction along the mounting hole.

2. The fixing structure as described in claim 1, characterized in that, Of the mounting hole and the insertion / removal portion, at least one segment of at least one of them has a gradually changing cross-section along its length direction.

3. The fixing structure as described in claim 2, characterized in that, From the socket end toward the fixed end, the diameter of at least a portion of the mounting hole is gradually reduced; and / or, The outer diameter of at least one segment of the insertion / removal portion gradually widens in the direction from the socket end toward the fixed end.

4. The fixing structure as described in claim 1, characterized in that, The side of the fixed end of the main body is provided with a cut that can communicate with the mounting hole, and the cut is provided to penetrate the end face of the fixed end.

5. The fixing structure as described in claim 4, characterized in that, Multiple cuts are provided, and the multiple cuts are spaced apart along the circumference of the main body.

6. The fixing structure as described in claim 1, characterized in that, The outer surface of the fixed end of the main body is provided with external threads.

7. The fixing structure as described in claim 1, characterized in that, The outer side of the main body is provided with a first limiting part for abutting against the compressor housing; and / or, The outer side of the insertion part is provided with a second limiting part, which abuts against the insertion end of the main body.

8. The fixing structure as described in claim 7, characterized in that, The outer surface of the main body is stepped to form a first limiting step surface, and the first limiting part includes the first limiting step surface; and / or, The outer side of the insertion / removal part is stepped to form a second limiting step surface, and the second limiting part includes the second limiting step surface.

9. The fixing structure as described in claim 1, characterized in that, One end of the insertion / extraction part is provided with a connecting part for connecting the pull-out part.

10. A compressor, characterized in that, include: A housing and a sealing plug, wherein the housing and the sealing plug are respectively provided with a first connecting hole and a second connecting hole, the housing is provided with an air intake port and an air exhaust port, and the sealing plug is provided at the air intake port and / or the air exhaust port; and... A fixing structure, including the fixing structure as described in any one of claims 1 to 9, wherein the main body of the fixing structure passes through the first connecting hole and the second connecting hole, so that the sealing plug can be detachably installed on the housing.

11. The compressor as claimed in claim 10, characterized in that, The first connecting hole is provided with an internal thread, and the outer side of the main body of the fixing structure is provided with an external thread. The main body of the fixing structure is threadedly installed in the first connecting hole.

12. The compressor as claimed in claim 11, characterized in that, On the same cross-section, the diameter of the mounting hole of the main body is D1, the outer diameter of the plug-in part of the fixing structure is D2, the major diameter of the thread of the main body is M1, the major diameter of the thread of the first connecting hole is M2, and the minor diameter of the thread of the first connecting hole is M3, wherein M1+(D2-D1)>(M2+M3) / 2.

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