Connecting structure and vacuum pump

Abstract

The utility model relates to the technical field of motors, and discloses a connecting structure and a vacuum pump. The connecting structure comprises a first rotating shaft, a second rotating shaft and a locking piece. The first rotating shaft is provided with a first end and a second end which are oppositely arranged. A mounting channel is formed in the first rotating shaft. The mounting channel has a tapered section in a direction from the first end to the second end. The second rotating shaft is coaxially connected with the first rotating shaft. One end of the second rotating shaft close to the first rotating shaft is provided with a connecting part. And the connecting part is gradually shrunk along the direction towards the first rotating shaft. The connecting part is provided with a first connecting hole. The connecting part is installed in the gradually-shrinking section in a matched mode. The locking piece comprises a limiting end and a connecting column. The connecting column is arranged in the mounting channel in a penetrating mode and connected with the first connecting hole. The limiting end abuts against the end face of the second end.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a connection structure and a vacuum pump. Background Art

[0002] In the related art, the motor is the core power element of the vacuum pump. Usually, a rigid direct connection is used to connect the motor rotor and the vacuum pump rotor to reduce the axial size of the vacuum pump. The rigid direct connection method usually includes: constructing a cylinder on one of the motor rotor and the vacuum pump rotor, and constructing a cylindrical groove on the other, and realizing the coaxial connection between the two based on the clearance fit between the cylinder and the cylindrical groove. In addition, the cylinder and the cylindrical groove are connected by a flat key or a spline to transmit torque. However, due to the existence of the gap, it is difficult to ensure the coaxiality of the motor rotor and the vacuum pump rotor. When the vacuum pump is running at high speed, the residual imbalance of the vacuum pump rotor is easily increased due to the poor coaxiality of the motor rotor and the vacuum pump rotor, which increases the load on the pump body bearing, thereby reducing the service life of the vacuum pump bearing, and is prone to vibration and noise. Utility Model Content

[0003] The present application aims to provide a connection structure and a vacuum pump, which drives the second rotating shaft to move toward the first rotating shaft through a locking member, so that the outer surface of the connecting part gradually fits with the inner surface of the tapered section, and ensures the gap-free fit between the connecting part and the tapered section through surface fitting and locking of the locking member, thereby improving the coaxiality of the first rotating shaft and the second rotating shaft, and transmitting the output torque of the motor through static friction.

[0004] The embodiment of the present application provides a connection structure, including:

[0005] A first rotating shaft, having a first end and a second end arranged opposite to each other, a mounting channel being configured in the first rotating shaft, and the mounting channel having a tapered section along a direction from the first end to the second end;

[0006] A second rotating shaft is coaxially connected to the first rotating shaft, and a connecting portion is configured at one end of the second rotating shaft close to the first rotating shaft, and the connecting portion is tapered in a direction toward the first rotating shaft, and the connecting portion is configured with a first connecting hole, wherein the connecting portion is cooperatively installed in the tapered section;

[0007] The locking member includes a limiting end and a connecting column, wherein the connecting column is inserted into the installation channel and connected to the first connecting hole, and the limiting end abuts against the end surface of the second end.

[0008] In some embodiments, the installation channel further includes a first equal diameter section, the first equal diameter section is connected to the smaller end of the tapered section, and the diameter of the first equal diameter section is the same as the diameter of the smaller end of the tapered section.

[0009] In some embodiments, the mounting channel also includes a second equal-diameter section and a third equal-diameter section, and along the direction from the first end to the second end, the tapered section, the first equal-diameter section, the second equal-diameter section and the third equal-diameter section are connected in sequence, wherein the diameter of the second equal-diameter section is D2, and the diameter of the third equal-diameter section is D3, satisfying: D2<D3, a clamping plate is installed in the third equal-diameter section, a second connecting hole is constructed on the clamping plate, the connecting column is passed through the second connecting hole in the mounting channel, and is connected to the first connecting hole, and the limiting end is abutted against the clamping plate.

[0010] In some embodiments, the diameter of the first equal diameter section is D1, and the diameter of the second equal diameter section is D2, satisfying: D2≤D1; and the inner surface of the second equal diameter section is configured with an internal thread.

[0011] In some embodiments, along the direction from the first end to the second end, the length of the connecting portion is L1, and the length of the tapered section is L2, satisfying: L1≤L2.

[0012] In some embodiments, the diameter of the smaller end of the tapered section is D4, and the diameter of the smaller end of the connecting portion is D5, satisfying: D4≤D5.

[0013] In some embodiments, the first rotating shaft, the second rotating shaft, the installation channel, the connecting portion, and the locking member are all coaxially arranged.

[0014] The present application also provides a vacuum pump, including:

[0015] case;

[0016] A stator assembly is installed in the housing;

[0017] A rotor assembly is installed in the stator assembly, and the rotor assembly is coaxially rotatably connected with the stator assembly;

[0018] As the aforementioned connection structure;

[0019] Wherein, the connection structure is installed in the shell, and the first rotating shaft is coaxially connected to the rotor assembly and rotates with the rotor assembly.

[0020] In some embodiments, the shell has a side plate arranged opposite to the second end, and a pump rocking hole is constructed on the side plate. The pump rocking hole is coaxially arranged with the locking member, wherein a sealing member is detachably connected to the pump rocking hole.

[0021] In some embodiments, the rotor assembly includes a first plate body, a second plate body, and an iron core sandwiched between the first plate body and the second plate body, wherein the first plate body is configured with a first through hole, the second plate body is configured with a second through hole, and the iron core is configured with a third through hole, the first through hole, the second through hole, and the third through hole are connected to form an assembly channel, and the first rotating shaft is installed in the assembly channel.

[0022] The connection structure and vacuum pump provided in the embodiments of the present application connect the connection part of the second rotating shaft through the installation channel constructed in the first rotating shaft. Since the installation channel has a tapered section, the connection part is tapered. When the locking member drives the second rotating shaft to move in the direction of the first rotating shaft, the outer surface of the connection part gradually fits with the inner surface of the tapered section. After the two are in close contact, the limit end also abuts against the end face of the second end to fix the positions of the first rotating shaft and the second rotating shaft to each other. Thus, a gapless fit is formed between the connection part and the tapered section through the mutual fit of the surfaces, thereby improving the coaxiality of the first rotating shaft and the second rotating shaft, and the locking member is used to lock so that there is sufficient friction between the connection part and the tapered section to transmit torque, so as to ensure that the first rotating shaft can drive the second rotating shaft to rotate coaxially. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0024] Figure 1 A cross-sectional view of a vacuum pump provided in an embodiment of the present application.

[0025] Figure 2 A cross-sectional view of a connection structure provided in an embodiment of the present application.

[0026] Figure 3 A cross-sectional view of the first rotating shaft provided in an embodiment of the present application.

[0027] Figure 4 A cross-sectional view of a second rotating shaft provided in an embodiment of the present application.

[0028] Figure 5 A schematic diagram of the structure of a vacuum pump provided in an embodiment of the present application.

[0029] Reference numerals:

[0030] 10-first rotating shaft, 110-first end, 120-second end, 130-tapered section, 140-first equal-diameter section, 150-second equal-diameter section, 160-third equal-diameter section, 20-second rotating shaft, 210-connecting portion, 220-first connecting hole, 30-locking member, 310-limiting end, 320-connecting column, 40-pressing plate, 410-second connecting hole, 50-housing, 510-side plate, 520-rocking pump hole, 530-sealing member, 60-stator assembly, 70-rotor assembly, 710-first plate body, 720-second plate body, 730-iron core. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0032] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0033] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0036] For details, please refer to Figures 1 to 5 , an embodiment of the present application provides a connection structure. The connection structure includes a first rotating shaft 10, a second rotating shaft 20 and a locking member 30. The first rotating shaft 10 has a first end 110 and a second end 120 arranged opposite to each other. A mounting channel is configured in the first rotating shaft 10. In the direction from the first end 110 to the second end 120, the mounting channel has a tapered section 130. The second rotating shaft 20 is coaxially connected to the first rotating shaft 10. A connecting portion 210 is configured at one end of the second rotating shaft 20 close to the first rotating shaft 10. In the direction toward the first rotating shaft 10, the connecting portion 210 is tapered. The connecting portion 210 is configured with a first connecting hole 220. The connecting portion 210 is cooperatively installed in the tapered section 130. The locking member 30 includes a limiting end 310 and a connecting column 320. The connecting column 320 is arranged in the mounting channel and connected to the first connecting hole 220. The limiting end 310 abuts against the end surface of the second end 120.

[0037] In this embodiment, the connecting portion 210 of the second rotating shaft 20 is connected through the installation channel constructed in the first rotating shaft 10. Since the installation channel has a tapered section 130, the connecting portion 210 is tapered. When the locking member 30 drives the second rotating shaft 20 to move toward the direction of the first rotating shaft 10, the outer surface of the connecting portion 210 gradually fits with the inner surface of the tapered section 130. After the two are in close contact, the limiting end 310 also abuts against the end surface of the second end 120, so that the positions of the first rotating shaft 10 and the second rotating shaft 20 are fixed to each other. Thus, a gapless fit is formed between the connecting portion 210 and the tapered section 130 through the mutual contact between the surfaces, thereby improving the coaxiality of the first rotating shaft 10 and the second rotating shaft 20, and the locking member 30 is used to lock so that there is sufficient friction between the connecting portion 210 and the tapered section 130 to transmit torque, so as to ensure that the first rotating shaft 10 can drive the second rotating shaft 20 to rotate coaxially.

[0038] It is understandable that the connecting column 320 can be used to drive the second rotating shaft 20 to move toward the second end 120 so that the outer surface of the connecting portion 210 abuts against the inner surface of the tapered section 130. The limiting end 310 can be used to abut against the second end 120 so that the connecting column 320 locks the positions of the first rotating shaft 10 and the second rotating shaft 20.

[0039] like Figure 2 As shown, in some embodiments, the tapered section 130 can be configured as a truncated cone-shaped channel or a conical channel. Correspondingly, the connecting portion 210 is configured as a truncated cone or a conical shape. When the outer surface of the connecting portion 210 abuts against the inner surface of the tapered section 130, the two conical surfaces can be made to fit tightly. Based on the locking force of the locking member 30 on the first rotating shaft 10 and the second rotating shaft 20, a pressure normal to the conical surface can be generated on the conical surface, so that sufficient friction is generated between the outer surface of the connecting portion 210 and the inner surface of the tapered section 130, so that the torque of the first rotating shaft 10 can be transmitted to the second rotating shaft 20.

[0040] In some embodiments, the tapered section 130 can also be configured as a trumpet-shaped channel. Correspondingly, it is configured as a trumpet-shaped column. When the outer surface of the connecting portion 210 abuts against the inner surface of the tapered section 130, the two trumpet-shaped gradient surfaces can be closely attached. Based on the locking force of the locking member 30 on the first rotating shaft 10 and the second rotating shaft 20, a pressure normal to the gradient surface can be generated on the trumpet-shaped gradient surface, so that sufficient friction is generated between the outer surface of the connecting portion 210 and the inner surface of the tapered section 130, so that the torque of the first rotating shaft 10 can be transmitted to the second rotating shaft 20.

[0041] The connecting portion 210 can be integrally formed with the second rotating shaft 20, and the connecting portion 210 is coaxially arranged with the second rotating shaft 20. The first end 110 and the second end 120 of the first rotating shaft 10 are two circular surface sides of the first rotating shaft 10 in the axial direction.

[0042] Please continue reading Figure 2 In some embodiments, the locking member 30 is a locking bolt, and the limiting end 310 and the connecting column 320 are integrally formed, and the connecting column 320 is a threaded column, and the first connecting hole 220 is a threaded hole. The connecting column 320 can be inserted into the installation channel from the second end 120, and the connecting portion 210 of the second rotating shaft 20 is inserted into the tapered section 130 of the installation channel from the first end 110. After the first connecting hole 220 of the connecting portion 210 forms a threaded connection with the connecting column 320, the locking member 30 continues to rotate to drive the connecting portion 210 to move toward the connecting column 320, that is, the second rotating shaft 20 will move toward the second end 120. As the connecting portion 210 continues to move, the outer surface of the connecting portion 210 will eventually fit the inner surface of the tapered section 130. After the two are fitted together, as the locking member 30 continues to rotate, the outer surface of the connecting portion 210 and the inner surface of the tapered section 130 can form a normal pressure, ensuring a gap-free assembly of the two and having a sufficiently large friction force between the two to transmit torque.

[0043] It should be noted that when the second shaft 20 is gradually moved toward the second end 120 by rotating the threaded column, the rotation of the second shaft 20 needs to be limited to prevent the second shaft 20 from being unable to move horizontally as the connecting column 320 rotates. The stopping method may include manual holding and mechanical holding.

[0044] In some embodiments, the locking member 30 is a telescopic mechanism, the limiting end 310 is a driving cylinder, the connecting column 320 is a piston rod, and the connecting column 320 is fixedly installed in the first connecting hole 220. When the piston rod is gradually retracted into the driving cylinder, the connecting column 320 can drive the connecting portion 210 to move in the direction of the connecting column 320, that is, the second rotating shaft 20 will move in the direction close to the second end 120. As the connecting portion 210 continues to move, the outer surface of the connecting portion 210 will eventually fit the inner surface of the tapered section 130. After the two fit each other, as the piston rod continues to be retracted, the outer surface of the connecting portion 210 and the inner surface of the tapered section 130 can form a normal pressure, ensuring a gap-free assembly of the two, and allowing the two to have a sufficiently large friction force to transmit torque.

[0045] like Figure 3 As shown, in some embodiments, the installation channel further includes a first equal diameter section 140 , which is connected to the smaller end of the tapered section 130 , and the diameter of the first equal diameter section 140 is the same as the diameter of the smaller end of the tapered section 130 .

[0046] Based on forming the first equal diameter section 140 in the installation channel, the first equal diameter section 140 is connected to the smaller end of the tapered section 130. As the locking member 30 gradually drives the second rotating shaft 20 to move in the direction close to the second end 120, the connecting portion 210 will gradually move in the direction of the first equal diameter section 140. Based on making the diameter of the first equal diameter section 140 the same as the diameter of the smaller end of the tapered section 130. If the diameter of the smaller end of the connecting portion 210 is the same as the diameter of the smaller end of the tapered section 130, the connecting portion 210 can only move to the position of the first equal diameter section 140 at most. Based on the first equal diameter section 140 as a buffer section, the connecting portion 210 can be prevented from passing through the tapered section 130. When the connecting portion 210 moves to the position of the first equal diameter section 140, the first rotating shaft 10 and the second rotating shaft 20 are locked with each other through the locking member 30 to achieve coaxial connection between the two. If the diameter of the smaller end of the connecting portion 210 is slightly larger than the diameter of the smaller end of the tapered section 130, the first equal diameter section 140 can be designed as a redundant one. If the diameter of the smaller end of the connecting portion 210 is slightly smaller than the diameter of the smaller end of the tapered section 130, the connecting portion 210 can be partially inserted into the first equal diameter section 140 to accommodate a portion of the connecting portion 210, thereby ensuring that the outer surface of the connecting portion 210 fits the inner surface of the tapered section 130.

[0047] Please continue reading Figure 3 In some embodiments, the installation channel also includes a second equal-diameter section 150 and a third equal-diameter section 160. Along the direction from the first end 110 to the second end 120, the tapered section 130, the first equal-diameter section 140, the second equal-diameter section 150 and the third equal-diameter section 160 are connected in sequence, wherein the diameter of the second equal-diameter section 150 is D2, and the diameter of the third equal-diameter section 160 is D3, satisfying: D2<D3, a clamping plate 40 is installed in the third equal-diameter section 160, and a second connecting hole 410 is configured on the clamping plate 40, and the connecting column 320 is passed through the second connecting hole 410 in the installation channel and is connected to the first connecting hole 220, and the limiting end 310 abuts against the clamping plate 40.

[0048] By forming the second equal diameter section 150 and the third equal diameter section 160, and making the diameter D2 of the second equal diameter section 150 smaller than the diameter D3 of the third equal diameter section 160, a step surface can be formed at the connection between the second equal diameter section 150 and the third equal diameter section 160. When the clamping plate 40 is assembled in the third equal diameter section 160, the step surface can limit the clamping plate 40 and prevent the clamping plate 40 from moving toward the second equal diameter section 150. At the same time, the step surface can also serve as the mounting surface of the clamping plate 40. For example, an adhesive layer can be provided on the step surface, and the clamping plate 40 can be bonded and fixed to the step surface by bonding. For example, when the first rotating shaft 10 and the second rotating shaft 20 are locked by the aforementioned locking bolt, the limiting end 310 and the step surface cooperate with each other, so that the clamping plate 40 can be clamped between the limiting end 310 and the step surface, and the position of the clamping plate 40 is fixed.

[0049] The size of the second connection hole 410 on the pressing plate 40 is equal to the size of the first connection hole 220 on the connecting portion 210. An internal thread may also be configured in the second connection hole 410. The first connection hole 220 and the second connection hole 410 are coaxially arranged. In addition, the first connection hole 220 and the second connection hole 410 may also be coaxially arranged with the first rotating shaft 10, the second rotating shaft 20 and the locking member 30.

[0050] Since the second equal-diameter section 150 and the third equal-diameter section 160 are both circular channels, the pressing plate 40 is a circular plate member.

[0051] like Figure 1 and Figure 3 As shown, in some embodiments, the diameter of the first equal diameter section 140 is D1, and the diameter of the second equal diameter section 150 is D2, satisfying: D2≤D1; the inner surface of the second equal diameter section 150 is configured with an internal thread. The internal thread is configured to connect the stud, so that the stud moves toward the connecting portion 210 and pushes the connecting portion 210 out of the tapered section 130.

[0052] Based on the fact that the diameter D2 of the second equal diameter section 150 is greater than or equal to the diameter D1 of the first equal diameter section 140, and the diameter of the first equal diameter section 140 is the same as the diameter of the smaller end of the tapered section 130. Then the rod that can pass through the second equal diameter section 150 is bound to be able to pass through the first equal diameter section 140 and the tapered section 130. And the diameter D2 of the second equal diameter section 150 is smaller than the diameter D3 of the third equal diameter section 160, so the rod that can pass through the second equal diameter section 150 is bound to be able to pass through the third equal diameter section 160. After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30, if the second rotating shaft 20 is to be removed from the first rotating shaft 10, the connecting portion 210 needs to be separated from the tapered section 130. Due to the long-term close contact between the two and the large friction force of the contact surface, it is easy to cause the connecting portion 210 and the tapered section 130 to be difficult to separate. After the locking member 30 and the pressing plate 40 are disassembled, a stud is inserted into the installation channel from the second end 120, and is threadedly installed on the second equal-diameter section 150 after being inserted through the third equal-diameter section 160. As the stud is screwed in continuously, the screwed-in end of the stud will pass through the first equal-diameter section 140 and abut against the connecting portion 210. As the stud is screwed in continuously, the screwed-in end of the stud can gradually push the connecting portion 210 out of the tapered section 130, thereby realizing the rapid separation of the connecting portion 210 and the tapered section 130, and facilitating the removal of the second rotating shaft 20 from the first rotating shaft 10.

[0053] At the same time, the first rotating shaft 10 and the second rotating shaft 20 are separated by using a stud to push the connecting part 210 out of the tapered section 130, without damaging the preload force of the interference fit between the iron core 730 and the first rotating shaft 10, thereby preventing the assembly between the first rotating shaft 10 and the iron core 730 from loosening during the disassembly of the second rotating shaft 20.

[0054] In some embodiments, the diameter D2 of the second equal diameter section 150 is greater than the diameter D1 of the first equal diameter section 140 .

[0055] In some embodiments, the diameter D2 of the second equal diameter section 150 is equal to the diameter D1 of the first equal diameter section 140, and the first equal diameter section 140 and the second equal diameter section 150 are directly connected. In this case, internal threads can be constructed on the inner surfaces of the first equal diameter section 140 and the second equal diameter section 150.

[0056] like Figure 3 and Figure 4 As shown, in some embodiments, along the direction from the first end 110 to the second end 120 , the length of the connecting portion 210 is L1 , and the length of the tapered section 130 is L2 , satisfying: L1 ≤ L2 .

[0057] Since the length L1 of the connecting portion 210 is less than or equal to the length L2 of the tapered section 130, it can be ensured that the connecting portion 210 will not pass through the tapered section 130. After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30, the outer surface of the connecting portion 210 is bound to fit the inner surface of the tapered section 130.

[0058] In some embodiments, the length L1 of the connecting portion 210 is smaller than the length L2 of the tapered section 130 . After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30 , the smaller end of the connecting portion 210 is spaced apart from the smaller end of the tapered section 130 .

[0059] In some embodiments, the length L1 of the connecting portion 210 is equal to the length L2 of the tapered section 130 . After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30 , the smaller end of the connecting portion 210 will be flush with the smaller end of the tapered section 130 .

[0060] like Figure 3 and Figure 4 As shown, in some embodiments, the diameter of the smaller end of the tapered section 130 is D4, and the diameter of the smaller end of the connecting portion 210 is D5, satisfying: D4≤D5.

[0061] Since the diameter D4 of the smaller end of the tapered section 130 is smaller than or equal to the diameter D5 of the smaller end of the connecting portion 210, it can be ensured that the connecting portion 210 will not pass through the tapered section 130. After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30, the outer surface of the connecting portion 210 is bound to fit the inner surface of the tapered section 130.

[0062] In some embodiments, the diameter D4 of the smaller end of the tapered section 130 is smaller than the diameter D5 of the smaller end of the connecting portion 210. After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30, the smaller end of the connecting portion 210 will be spaced apart from the smaller end of the tapered section 130.

[0063] In some embodiments, the diameter D4 of the smaller end of the tapered section 130 is equal to the diameter D5 of the smaller end of the connecting portion 210. After the first rotating shaft 10 and the second rotating shaft 20 are locked by the locking member 30, the smaller end of the connecting portion 210 will be flush with the smaller end of the tapered section 130.

[0064] like Figure 1 In some embodiments, the first rotating shaft 10, the second rotating shaft 20, the installation channel, the connecting portion 210 and the locking member 30 are all coaxially arranged. Based on the coaxial arrangement of the five, the connecting structure does not move eccentrically during the rotation process, ensuring the coaxiality and the stability of the rotation.

[0065] It is understandable that when the first rotating shaft 10 , the second rotating shaft 20 , the installation channel, the connecting portion 210 and the locking member 30 are all coaxially arranged, the first rotating shaft 10 and the second rotating shaft 20 are locked only by the locking member 30 .

[0066] In other embodiments of the present application, multiple locking members 30 may be provided. In this case, the first rotating shaft 10, the second rotating shaft 20, the installation channel, and the connecting portion 210 are coaxially arranged. The multiple locking members 30 are centrally symmetrically distributed along the axis of the first rotating shaft 10. By making the multiple locking members 30 act synchronously, the connecting portion 210 can also move smoothly in the second direction, and it can also ensure that the outer surface of the connecting portion 210 is tightly fitted with the inner surface of the tapered section 130.

[0067] The present application also provides a vacuum pump. Figure 1 and Figure 5 As shown, the vacuum pump includes a housing 50, a stator assembly 60, a rotor assembly 70, and a connection structure as in the above-mentioned embodiment. The stator assembly 60 is installed in the housing 50. The rotor assembly 70 is installed in the stator assembly 60. The rotor assembly 70 is coaxially connected to the stator assembly 60 for rotation. Among them, the connection structure is installed in the housing 50. The first rotating shaft 10 is coaxially connected to the rotor assembly 70 and rotates with the rotor assembly 70.

[0068] In this embodiment, the connecting portion 210 of the second rotating shaft 20 is connected through the installation channel constructed in the first rotating shaft 10. Since the installation channel has a tapered section 130, the connecting portion 210 is tapered. When the locking member 30 drives the second rotating shaft 20 to move toward the direction of the first rotating shaft 10, the outer surface of the connecting portion 210 gradually fits with the inner surface of the tapered section 130. After the two are in close contact, the limiting end 310 also abuts against the end surface of the second end 120, so that the positions of the first rotating shaft 10 and the second rotating shaft 20 are fixed to each other. Thus, a gapless fit is formed between the connecting portion 210 and the tapered section 130 through the mutual contact between the surfaces, thereby improving the coaxiality of the first rotating shaft 10 and the second rotating shaft 20, and the locking member 30 is used to lock so that there is sufficient friction between the connecting portion 210 and the tapered section 130 to transmit torque, so as to ensure that the first rotating shaft 10 can drive the second rotating shaft 20 to rotate coaxially.

[0069] It can be understood that the rotor assembly 70 can be rotated by the cooperation of the stator assembly 60 and the rotor assembly 70. Based on the rotation of the rotor assembly 70, the first rotating shaft 10 can be driven to rotate. Thus, the first rotating shaft 10 is used as the rotating shaft of the motor, and the second rotating shaft 20 is used as the main shaft of the vacuum pump. The connecting structure in the above embodiment is used to connect the rotating shaft of the motor and the main shaft of the vacuum pump to achieve a gap-free fit between the two, thereby improving the coaxiality. When the vacuum pump is working, since the coaxiality of the rotating shaft of the motor and the main shaft of the vacuum pump is small, the load of the vacuum pump will be reduced, the service life of the vacuum pump can be extended, and the noise of the vacuum pump can be reduced, and the vibration of the vacuum pump can be weakened.

[0070] The stator assembly 60 may be interference fit with the inner surface of the housing 50 .

[0071] like Figure 1 As shown, in some embodiments, the housing 50 has a side plate 510 disposed opposite to the second end 120. A pump hole 520 is configured on the side plate 510. The pump hole 520 is coaxially disposed with the locking member 30. A sealing member 530 is detachably connected to the pump hole 520.

[0072] When the vacuum pump is in use, there is a need to manually shake the pump, and by manually shaking the pump, it can be determined whether the rotating shaft of the vacuum pump is stuck. A shaking pump hole 520 is constructed on the side plate 510 of the housing 50. When the pump needs to be shaken, the seal 530 can be removed from the shaking pump, and then an Allen wrench can be inserted into the shaking pump hole 520, and the Allen wrench can be matched with the Allen hole of the locking bolt, so that the shaking pump function can be realized by shaking the Allen wrench.

[0073] The side plate 510 may be thickened at the position of the pump hole 520 to form a stepped pump hole 520. An internal thread may be constructed in the pump hole 520, and the seal 530 may be a sealing bolt, and a sealing pad or an elastic pad is sleeved in the sealing bolt. The sealing bolt is threadedly connected to the pump hole 520, and the end of the sealing bolt abuts the sealing pad or the elastic pad against the outer surface of the side plate 510 to achieve airtightness, so as to form a vacuum environment inside the housing 50.

[0074] like Figure 2 As shown, in some embodiments, the rotor assembly 70 includes a first plate body 710, a second plate body 720, and an iron core 730 sandwiched between the first plate body 710 and the second plate body 720. The first plate body 710 is configured with a first through hole. The second plate body 720 is configured with a second through hole. The iron core 730 is configured with a third through hole. The first through hole, the second through hole, and the third through hole are connected to form an assembly channel. The first rotating shaft 10 is installed in the assembly channel.

[0075] The iron core 730 is sandwiched between the first plate 710 and the second plate 720, and the first through hole, the second through hole and the third through hole are connected to form an assembly channel with a certain length. The first rotating shaft 10 is installed in the assembly channel and is installed with interference fit therewith. When the iron core 730 cooperates with the stator assembly 60 to form a rotation, the first rotating shaft 10 can be driven to rotate coaxially.

[0076] The first plate body 710 and the second plate body 720 are both annular plates. The first plate body 710 and the second plate body 720 are respectively fixedly installed on opposite sides of the iron core 730.

[0077] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0078] The above is a detailed introduction to a connection structure and a vacuum pump provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A connection structure, characterized in that: include: A first rotating shaft, having a first end and a second end arranged opposite to each other, a mounting channel being configured in the first rotating shaft, and the mounting channel having a tapered section along a direction from the first end to the second end; A second rotating shaft is coaxially connected to the first rotating shaft, and a connecting portion is configured at one end of the second rotating shaft close to the first rotating shaft, and the connecting portion is tapered in a direction toward the first rotating shaft, and the connecting portion is configured with a first connecting hole, wherein the connecting portion is cooperatively installed in the tapered section; The locking member includes a limiting end and a connecting column, wherein the connecting column is inserted into the installation channel and connected to the first connecting hole, and the limiting end abuts against the end surface of the second end.

2. The connection structure according to claim 1, characterized in that: The installation channel further includes a first equal diameter section, which is connected to the smaller end of the tapered section, and has a diameter that is the same as the diameter of the smaller end of the tapered section.

3. The connection structure according to claim 2, characterized in that: The installation channel also includes a second equal-diameter section and a third equal-diameter section. Along the direction from the first end to the second end, the tapered section, the first equal-diameter section, the second equal-diameter section and the third equal-diameter section are connected in sequence, wherein the diameter of the second equal-diameter section is D2, the diameter of the third equal-diameter section is D3, satisfying: D2<D3, a clamping plate is installed in the third equal-diameter section, a second connecting hole is configured on the clamping plate, the connecting column is passed through the second connecting hole in the installation channel and is connected to the first connecting hole, and the limiting end is abutted against the clamping plate.

4. The connection structure according to claim 3, characterized in that: The diameter of the first equal diameter section is D1, and the diameter of the second equal diameter section is D2, satisfying: D2≤D1; the inner surface of the second equal diameter section is configured with an internal thread.

5. The connection structure according to claim 1, characterized in that: Along the direction from the first end to the second end, the length of the connecting portion is L1, and the length of the tapered section is L2, satisfying: L1≤L2.

6. The connection structure according to claim 1, characterized in that: The diameter of the smaller end of the tapered section is D4, and the diameter of the smaller end of the connecting portion is D5, satisfying: D4≤D5.

7. The connection structure according to any one of claims 1 to 6, characterized in that: The first rotating shaft, the second rotating shaft, the installation channel, the connecting portion and the locking member are all coaxially arranged.

8. A vacuum pump, characterized in that: include: case; A stator assembly is installed in the housing; A rotor assembly is installed in the stator assembly, and the rotor assembly is coaxially rotatably connected with the stator assembly; The connection structure according to any one of claims 1 to 7; Wherein, the connection structure is installed in the shell, and the first rotating shaft is coaxially connected to the rotor assembly and rotates with the rotor assembly.

9. The vacuum pump according to claim 8, characterized in that The shell has a side plate arranged opposite to the second end, and a pump rocking hole is constructed on the side plate. The pump rocking hole is coaxially arranged with the locking member, wherein a sealing member is detachably connected to the pump rocking hole.

10. The vacuum pump according to claim 8, characterized in that The rotor assembly includes a first plate body, a second plate body, and an iron core sandwiched between the first plate body and the second plate body, wherein the first plate body is configured with a first through hole, the second plate body is configured with a second through hole, and the iron core is configured with a third through hole, the first through hole, the second through hole, and the third through hole are connected to form an assembly channel, and the first rotating shaft is installed in the assembly channel.

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