CN110529379B

CN110529379B - Vacuum pump

Info

Publication number: CN110529379B
Application number: CN201910866562.7A
Authority: CN
Inventors: 何文财
Original assignee: Yazreid Mechanical&electrical Tech Co ltd
Current assignee: Yazreid Mechanical&electrical Tech Co ltd
Priority date: 2019-09-12
Filing date: 2019-09-12
Publication date: 2021-01-01
Anticipated expiration: 2039-09-12
Also published as: CN110529379A

Abstract

The invention belongs to the technical field of vacuum pumps, and particularly relates to a vacuum pump which comprises a shell and an air channel, wherein the air channel is communicated with the interior of the shell, an inner shifting wheel is eccentrically arranged in the shell, a rotary rotating plate is arranged at the center of the interior of the shell, a plurality of inner ring teeth are arranged on the outer circular surface of the rotary rotating plate, and the inner shifting wheel is positioned in a ring surrounded by the inner ring teeth; the matching of the inner thumb wheel and the inner ring teeth can achieve the function of driving airflow to flow, and further has the property of a pump; the end faces of the opposite rotating plates of the inner shifting wheels are hollow, and the first belt wheel and the second belt wheel are in same-direction transmission through a synchronous belt. According to the invention, the first belt wheel and the second belt wheel are positioned in the hollow space of the inner thumb wheel, so that the rotation of the rotary plate and the inner thumb wheel are synchronous, separate driving is not needed, the difficulty in sealing the inside and the outside of the pump body is reduced, and only the rotating shaft of the pump body is externally and externally sealed; in addition, the two rotating parts in the pump body do not rotate eccentrically in the rotating process, so that the pump body cannot vibrate due to eccentricity, and the pump body has a good using effect.

Description

Vacuum pump

Technical Field

The invention belongs to the technical field of vacuum pumps, and particularly relates to a vacuum pump.

Background

At present, vacuum pumps are developed and used in various industries, and air in a space can be sucked out through the vacuum pumps to generate a vacuum state to a certain degree. Vacuum pumps are of many designs, having eccentrically rotating rotors or having projecting vanes or reciprocating pistons, whose rotational inertia varies during rotation of the rotor. The design principle of the change of the rotational inertia of the rotor of the pump body can cause vibration in the use process of the pump body to a certain extent, further noise is caused or the service life is influenced, in order to avoid the need of carrying out shockproof treatment on a shockproof base and the like, the rotor which only rotates and has no change of the rotational inertia is necessarily designed to be used as a rotating part of the pump body, and meanwhile, the input shaft is only one shaft as far as possible, so that the sealing of the rotor is easy and reliable.

The invention designs a vacuum pump to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a vacuum pump which is realized by adopting the following technical scheme.

In the description of the present invention, it should be noted that the terms "inside", "below", "upper" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention usually place when using, and are only used for convenience of description and simplification of description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation or be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The utility model provides a vacuum pump, includes the base, through motor support mounting motor on the base, through pump body support mounting pump body on the base, motor shaft pass through the shaft coupling and be connected with pump body pivot power, the installation of these structures all is conventional technique, belongs to the conventional accessory in the pump body technique, its characterized in that: the pump body comprises a circular shell and air channels symmetrically arranged on two sides of the shell, the air channels are communicated with the inside of the shell, meanwhile, air one-way valves are arranged in the two air channels or on a pipeline communicated with the air channels according to the direction of a rotating part in the pump body, so that when the pump body stops rotating in the flowing process of air flow, the air flow cannot reversely flow into a pumped vacuum cavity, an inner shifting wheel with a plurality of circumferentially uniform shifting teeth is eccentrically arranged in the shell, a rotating rotary plate is arranged at the center of the inside of the shell, a plurality of inner ring teeth are circumferentially uniformly arranged on the outer circumferential surface of the rotary plate, the side end surface of the inner shifting wheel is in contact with the side end surface of the rotary plate, and the inner shifting wheel is positioned in a ring formed by the plurality of; the matching of the inner thumb wheel and the inner ring teeth can achieve the function of driving airflow to flow, and further has the property of a pump. The side surface of the shell is provided with an arc baffle which is positioned in a gap between the inner thumb wheel and the inner ring teeth; at the symmetrical direction of the arc baffle plate with the center of the shell, the shifting teeth on the inner shifting wheel occupy the gap between the adjacent inner ring teeth. The arc baffle is matched with the inner thumb wheel and the inner ring teeth, so that redundant space of the inner thumb wheel and the inner ring teeth is occupied by the arc baffle when the inner thumb wheel and the inner ring teeth are separated, and the effect of improving the flowing space of airflow is achieved.

The inner shifting wheel is hollow in the end face of the rotating plate in opposite directions, the second belt wheel is installed in the center of the hollow inner shifting wheel, the first belt wheel is installed in the center of the rotating plate, the first belt wheel is located in the hollow space of the inner shifting wheel, and the first belt wheel and the second belt wheel are in same-direction transmission through the synchronous belt. The rotation between the inner thumb wheel and the inner ring gear must rotate in the same direction at a certain proportion of rotation speed, so that the rotation between the inner thumb wheel and the inner ring gear in the design is realized through the synchronous belt transmission of the first belt wheel and the second belt wheel, preferably, the number of the thumb wheel on the inner thumb wheel is 5, the number of the inner ring gear is 6, the rotation speed on the inner thumb wheel and the rotating plate is 6:5, and the diameter ratio of the first belt wheel to the second belt wheel is 6: 5.

The rotating shaft of the pump body penetrates into the shell to be in power connection with the rotating plate.

First band pulley and second band pulley are located the design aim at of interior thumb wheel hollow space: the rotation of the rotary plate and the rotation of the inner thumb wheel are synchronized without separate driving, so that the difficulty of dynamic sealing inside and outside the pump body is reduced; secondly, the transmission structure is designed in a hollow space, so that the transmission structure is not exposed in an airflow channel of the pump body, and meanwhile, heat is generated or scraps are damaged in the transmission process of the transmission structure, so that airflow is not influenced; thirdly, the pump body can be operated only by driving the rotating shaft of the pump body through the motor, and the pump body is convenient to use; fourthly, the sealing performance is good, the sealing technical requirement is low, only from the external sealing angle, the rotating shaft of the pump body is stressed to move, and the other positions are static sealing, so that the difficulty is low.

As a further improvement of the technology, the housing comprises an outer ring shell, a first cover and a second cover, wherein the first cover and the second cover are arranged on two sides of the outer ring shell, the first cover is provided with a first supporting hole in the center, the second cover is provided with a second supporting hole at the eccentric position of the end face, and the two air channels are symmetrically arranged on the outer ring shell. The first supporting hole and the second supporting hole are arranged for fixing the inner thumb wheel and the rotating plate, so that the inner thumb wheel and the rotating plate can rotate.

As a further improvement of the present technology, the housing further includes an end cover and a bearing cap, the end cover is mounted on the first cover end surface and is located at the first support hole, the bearing cap is mounted on the second cover end surface and is located at the second support hole. The design aim at of bearing cap can guarantee that corresponding bearing uses reliably, prevents that the dust from getting into, plays completely isolated pump body inside and outside effect simultaneously, and preferred bearing cap can be formed as an organic whole processing or casting with the second lid, guarantees the inside and outside isolation of decision. The end cover is designed to ensure that the rotating shaft of the pump body has enough sealing space and supporting space and is used as the only part needing to be sealed in the transmission of the pump body, the sealing structure between the rotating shaft of the pump body and the end cover can be sealed by adopting the mature dynamic sealing technology in the prior art, and meanwhile, the specific structural form of the end cover can form a design according to the structure required by the existing dynamic sealing technology.

For the invention, the vacuum pumping capacity of the pump body is influenced by the quality of the selected sealing technology, and if the pump body is not well sealed, the pump body can also achieve the purpose of vacuum pumping, but the effect is not good enough. The presence or absence of the sealing structure does not affect the use of the pump body of the invention, nor does it affect the subject of the invention to be protected.

As a further improvement of the technology, the inner thumb wheel comprises a second clamping shaft, a second supporting shaft, a second belt wheel and a thumb wheel cover, wherein the thumb wheel cover is arranged on one side of the hollow space of the inner thumb wheel; a second clamping shaft is installed on one side of the wheel shifting cover, and a second belt wheel is installed on the other side of the wheel shifting cover through a second supporting shaft.

As a further improvement of the technology, one side of the rotary plate is provided with a first belt wheel through a first support shaft, and the other side of the rotary plate is connected with a pump body rotating shaft.

As a further improvement of the present technology, the second chuck shaft passes through the second support hole and is located in the bearing cover, and is mounted in the second support hole by a bearing.

As a further improvement of the technology, the pump body rotating shaft penetrates through the first supporting hole and is installed in the first supporting hole through a bearing, and the end cover is in rotating fit with the pump body rotating shaft.

As a further improvement of the present technology, the center planes of the first pulley and the second pulley are located on the same plane. The synchronous belt transmission can be ensured to be smoothly carried out on the same plane.

As a further improvement of the present technology, there is no gap between the rotary plate and the first cover and lubrication with lubricating oil or grease, there is no gap between the arc blocking block and the rotary plate and lubrication with lubricating oil or grease, there is no gap between the inner ring gear and the second cover and lubrication with lubricating oil or grease, there is no gap between the inner thumb wheel and the second cover and lubrication with lubricating oil or grease, and there is no gap between the inner thumb wheel and the rotary plate and lubrication with lubricating oil or grease. The absence of gaps and the presence of lubricating oil or grease lubrication ensures the sealing of the structure while preventing dry friction between the parts, producing unnecessary friction losses and noise, while prolonging service life. It is noteworthy that the use of grease requires use without contaminating the evacuated space.

As a further improvement of the technology, the end face of the ring of the inner thumb wheel is provided with a plurality of circles of sealing convex rings and a circle of sealing groove at the innermost circle, and the sealing convex rings are matched with the end face of the rotating plate but are not in friction contact; the sealing groove of the inner thumb wheel is provided with a sealing ring which is extruded by the rotary plate.

The sealing structure ensures the sealing performance of the airflow channel and the transmission structure cavity at the rotating matching position between the rotating plate and the inner dial wheel. In the sealing structure, two structures are adopted: the sealing convex ring and the rotary plate are in end face sealing, dynamic airflow isolation is formed by matching the sealing convex ring and the rotary plate, a certain sealing effect is achieved, meanwhile, friction loss between the rotary plate and the inner thumb wheel is prevented, the sealing convex ring is not in friction contact with the rotary plate, the specific gap or the specific shape of the convex ring is what, and corresponding non-contact sealing technology or experimental data of a rotary body can be obtained in a plurality of papers or data of pump body design or aero-engine design. Therefore, the invention does not introduce the specific design details and does not influence the smooth implementation of the invention; and secondly, the extruded sealing ring is designed for conventional sealing, and lubricating oil or lubricating grease is added at the sealing position to reduce friction loss. Because the sealing ring is used for sealing, the vacuum pump is suitable for occasions with low vacuum degree requirements to a certain extent.

Compared with the traditional vacuum pump technology, the first belt wheel and the second belt wheel are positioned in the hollow space of the inner thumb wheel, so that the rotation of the rotary plate and the rotation of the inner thumb wheel are synchronous, separate driving is not needed, the difficulty in sealing the inside and the outside of the pump body is reduced, and only the rotary shaft of the pump body is externally and heavily sealed; meanwhile, the transmission structure is designed in a hollow space, so that the transmission structure is not exposed in an airflow channel of the pump body, and meanwhile, the airflow is not influenced by heating or damaged debris in the transmission process of the transmission structure; in addition, the two rotating parts in the pump body do not rotate eccentrically in the rotating process, so that the pump body cannot vibrate due to eccentricity, and the pump body has a good using effect.

Drawings

Fig. 1 is a schematic view of the overall component distribution.

Fig. 2 is a perspective view of the structure of the integral part.

Fig. 3 is a side view of the unitary member construction.

Fig. 4 is an external view of the pump body.

FIG. 5 is a side perspective view of the pump body.

FIG. 6 is a perspective view of the pump body.

FIG. 7 is a cross-sectional view of the pump body.

Fig. 8 is a partial schematic view of a pump body transmission structure.

FIG. 9 is a schematic view of an arc baffle installation.

Fig. 10 is a schematic view of the housing structure.

Fig. 11 is a schematic view of the structure of the inner thumb wheel.

Fig. 12 is a schematic view of a second pulley mounting and sealing collar arrangement.

Fig. 13 is a schematic view of the components to which the spin plate is attached.

Fig. 14 is a first pulley installation schematic.

Fig. 15 is a schematic view of a sealing structure.

Fig. 16 is a schematic diagram of a synchronous belt drive configuration.

FIG. 17 is a schematic diagram of the pump vacuum pumping operation.

Number designation in the figures: 1. supporting the pump body; 2. a pump body; 3. a coupling; 4. a motor; 5. supporting a motor; 6. a base; 8. a motor shaft; 9. an air channel; 10. a first cover; 11. a pump body rotating shaft; 12. inner ring teeth; 13. an arc blocking block; 14. an inner dial wheel; 15. a second cover; 16. rotating the plate; 17. a first pulley; 18. a second pulley; 19. a synchronous belt; 20. a first support shaft; 21. a bearing; 22. a second chuck shaft; 23. a bearing cap; 24. a second support shaft; 25. a wheel pulling cover; 26. an end cap; 27. an outer annular shell; 28. a second support hole; 30. a first support hole; 32. a sealing convex ring; 33. a sealing groove; 35. and (5) sealing rings.

Detailed Description

The drawings are schematic illustrations of the implementation of the present invention to facilitate understanding of the principles of structural operation. The specific product structure and the proportional size are determined according to the use environment and the conventional technology.

As shown in fig. 1, 2 and 3, the vacuum pump of the present invention comprises a base 6, a motor 4 mounted on the base 6 through a motor support 5, a pump body 2 mounted on the base 6 through a pump body support 1, and a motor shaft 8 in power connection with a pump body shaft 11 through a coupling 3, wherein the mounting of these structures is conventional technology, and belongs to conventional accessories in the pump body 2 technology, and is characterized in that: as shown in fig. 4, 5, 6, and 7, the pump body 2 includes a circular housing, and air passages 9 symmetrically installed on both sides of the housing, where the air passages 9 communicate with the inside of the housing, and meanwhile, according to the direction of a rotating component in the pump body 2, air check valves are installed in the two air passages 9 or on a pipeline communicating with the air passages 9, so that when the pump body 2 stops rotating during the flowing process of the air flow, the air flow does not reversely flow into the evacuated chamber, an inner dial wheel 14 having a plurality of circumferentially uniform dial teeth is eccentrically installed inside the housing, a rotating dial plate 16 is installed at the center inside of the housing, a plurality of inner ring teeth 12 are uniformly installed on the outer circumferential surface of the dial plate 16 in the circumferential direction, the end surface of the inner dial wheel 14 contacts with the end surface of the dial plate 16, and the inner dial wheel 14 is located in a ring surrounded by the plurality of inner; the matching of the inner thumb wheel 14 and the inner ring teeth 12 can achieve the function of driving airflow to flow, and further has the property of a pump. An arc baffle is arranged on the side surface of the shell and is positioned in a gap between the inner thumb wheel 14 and the inner ring teeth 12 as shown in figure 9; at the symmetrical direction of the arc baffle with the center of the shell, the shifting teeth on the inner shifting wheel 14 occupy the gap between the adjacent inner ring teeth 12. The arc baffle is matched with the inner thumb wheel 14 and the inner ring teeth 12, so that redundant space of the inner thumb wheel 14 and the inner ring teeth 12 is occupied by the arc baffle when the inner thumb wheel and the inner ring teeth are separated, and the function of improving the air flow flowing space is achieved.

As shown in fig. 7, 8, 11 and 16, the end face of the inner thumb wheel 14 opposite to the rotating plate 16 is hollow, a second belt wheel 18 is installed at the hollow inner center of the inner thumb wheel 14, a first belt wheel 17 is installed at the center of the rotating plate 16, the first belt wheel 17 is located in the hollow space of the inner thumb wheel 14, and the first belt wheel 17 and the second belt wheel 18 are in same-direction transmission through a synchronous belt 19. The rotation between the inner thumb wheel 14 and the inner ring gear 12 must rotate in the same direction with a certain proportion of rotation speed, so in the design, the rotation between the inner thumb wheel 14 and the inner ring gear 12 is realized by the transmission of the synchronous belt 19 of the first belt pulley 17 and the second belt pulley 18, preferably, the number of the thumb wheel on the inner thumb wheel 14 is 5, the number of the inner ring gear 12 is 6, the rotation speed on the inner thumb wheel 14 and the rotating plate 16 is 6:5, and the diameter ratio of the first belt pulley 17 to the second belt pulley 18 is 6: 5.

As shown in fig. 8, the pump body rotating shaft 11 penetrates the housing to be in power connection with the rotary plate 16.

The design purpose of the first belt pulley 17 and the second belt pulley 18 in the hollow space of the inner thumb wheel 14 is as follows: firstly, the rotation of the rotary plate 16 and the rotation of the inner thumb wheel 14 are synchronized without separate driving, so that the difficulty of sealing the inside and the outside of the pump body 2 is reduced; secondly, the transmission structure is designed in a hollow space, so that the transmission structure is not exposed in the airflow channel of the pump body 2, and meanwhile, the transmission structure generates heat or damages chippings in the transmission process and cannot influence airflow; thirdly, the pump body 2 can be operated only by driving the pump body rotating shaft 11 through the motor 4, and the pump body 2 is convenient to use; fourthly, the sealing performance is good, the sealing technical requirement is low, and only the rotating shaft 11 of the pump body is externally and heavily sealed.

As shown in fig. 9 and 10, the housing includes an outer annular housing 27, a first cover 10, and a second cover 15, wherein the first cover 10 and the second cover 15 are mounted on both sides of the outer annular housing 27, the first cover 10 has a first support hole 30 in the center, the second cover 15 has a second support hole 28 at an eccentric position of the end surface, and the two air passages 9 are symmetrically mounted on the outer annular housing 27. The first and second support holes 30, 28 are provided to secure the inner thumb wheel 14 and the dial plate 16 such that the inner thumb wheel 14 and the dial plate 16 can rotate.

As shown in fig. 10, the housing further includes an end cover 26 and a bearing cover 23, the end cover 26 is mounted on the end surface of the first cover 10, the end cover 26 is located at the first support hole 30, the bearing cover 23 is mounted on the end surface of the second cover 15, and the bearing cover 23 is located at the second support hole 28. The design aim at of bearing cap 23 can guarantee that corresponding bearing 21 uses reliably, prevents that the dust from getting into, plays the effect inside and outside completely isolated pump body 2 simultaneously, and preferred bearing cap 23 can be formed as an organic whole with second lid 15 or casting, guarantees the inside and outside isolation of decision. The end cover 26 is designed to ensure that the pump body rotating shaft 11 has enough sealing space and supporting space, and is used as the only component needing sealing in the transmission of the pump body 2, the sealing structure between the pump body rotating shaft 11 and the end cover 26 can be sealed by adopting the mature dynamic sealing technology in the prior art, and meanwhile, the specific structural form of the end cover 26 can be designed according to the structural form required by the existing dynamic sealing technology.

For the invention, the vacuum pumping capability of the pump body 2 is affected by the quality of the selected sealing technology, and if the pump body 2 is not well sealed, the purpose of vacuum pumping can be achieved by the pump body 2, but the effect is not good enough. The presence or absence of the sealing structure does not affect the use of the pump body 2 of the invention, nor does it affect the subject of the invention to be protected.

As shown in fig. 7, 8 and 12, the inner thumb wheel 14 includes a second clamping shaft 22, a second supporting shaft 24, a second belt wheel 18 and a thumb wheel cover 25, and the thumb wheel cover 25 is installed on one side of the hollow space of the inner thumb wheel 14; the second clamping shaft 22 is installed on one side of the wheel pulling cover 25, and the second belt wheel 18 is installed on the other side of the wheel pulling cover through the second supporting shaft 24.

As shown in fig. 13 and 14, a first pulley 17 is attached to one side of the rotary plate 16 via a first support shaft 20, and the other side of the rotary plate 16 is connected to the pump body rotating shaft 11.

As shown in fig. 12, the second chucking shaft 22 passes through the second support hole 28 and is located in the bearing cover 23, and is mounted in the second support hole 28 through the bearing 21.

As shown in fig. 14, the pump body rotating shaft 11 passes through the first supporting hole 30 and is mounted in the first supporting hole 30 through the bearing 21, and the head cover 26 is rotatably engaged with the pump body rotating shaft 11.

As shown in fig. 8, the center planes of the first pulley 17 and the second pulley 18 are located on the same plane. The synchronous belt 19 can be ensured to drive smoothly in the same plane.

As shown in fig. 7 and 8, there is no gap between the rotary plate 16 and the first cover 10 and lubrication with lubricant or grease, there is no gap between the arc stopper 13 and the rotary plate 16 and lubrication with lubricant or grease, there is no gap between the inner ring gear 12 and the second cover 15 and lubrication with lubricant or grease, there is no gap between the inner thumb wheel 14 and the second cover 15 and lubrication with lubricant or grease, and there is no gap between the inner thumb wheel 14 and the rotary plate 16 and lubrication with lubricant or grease. The absence of gaps and the presence of lubricating oil or grease lubrication ensures the sealing of the structure while preventing dry friction between the parts, producing unnecessary friction losses and noise, while prolonging service life.

As shown in fig. 12 and 15, a plurality of sealing convex rings 32 and a circle of sealing grooves 33 at the innermost circle are processed on the circular ring end surface of the inner thumb wheel 14, and the sealing convex rings 32 are matched with the end surface of the rotating plate 16, but are not in friction contact; the seal ring 35 is installed on the seal groove 33 of the inner thumb wheel 14, and the seal ring 35 is extruded by the rotary plate 16.

The sealing structure ensures the sealing performance of the air flow channel and the transmission structure cavity at the rotating matching position between the rotary plate 16 and the inner thumb wheel 14. In the sealing structure, two structures are adopted: firstly, the sealing convex ring 32 arranged in multiple circles is sealed with the end face of the rotary plate 16, the multiple circles of sealing convex rings 32 are matched with the rotary plate 16 to form dynamic air flow isolation, a certain sealing effect is achieved, meanwhile, the friction loss between the rotary plate 16 and the inner thumb wheel 14 is prevented, the sealing convex ring 32 is not in friction contact with the rotary plate 16, the specific gap is what or the specific shape of the convex ring, and corresponding non-contact sealing technology or experimental data of a rotary body can be obtained in a plurality of papers or data of the design of the pump body 2 or the design of an aeroengine. Therefore, the invention does not introduce the specific design details and does not influence the smooth implementation of the invention; and secondly, a pressed sealing ring 35 is designed for conventional sealing.

The invention is operated as follows: the motor 4 drives the pump body rotating shaft 11 to rotate through the coupler 3, the pump body rotating shaft 11 drives the rotary plate 16 to rotate on one hand, and drives the inner thumb wheel 14 to rotate through the transmission of the synchronous belt 19 on the other hand, as shown in fig. 17, the inner thumb wheel 14 and the spin plate 16 rotate clockwise, and when the inner thumb wheel 14 and the spin plate 16 rotate, because the inner thumb wheel 14 separates from the adjacent inner ring teeth 12, and negative pressure is generated at the air passage 9 on the left, air flow is sucked into the pump body 2 from the gap between the inner ring teeth 12, then, with the stirring action of the inner ring teeth 12 and the inner thumb wheel 14, the gas enters the vicinity of the right gas channel 9 from the upper side and the lower side of the arc blocking block 13 respectively, after passing through the right air channel 9, the poking teeth gradually enter the adjacent inner ring teeth 12, so that the space in the pump body 2 is reduced, the pressure is increased, air flow is enabled to go out from the right air channel 9, and the purpose of vacuumizing the pump body 2 is achieved. In operation, the oil lubrication inside the pump body 2 or the sealing of the sealing ring 35 provides a good sealing and lubrication.

In conclusion, the beneficial effects of the invention are as follows: according to the invention, the first belt wheel 17 and the second belt wheel 18 are positioned in the hollow space of the inner thumb wheel 14, so that the rotation of the rotary plate 16 and the rotation of the inner thumb wheel 14 are synchronous, separate driving is not needed, the difficulty in internal and external sealing of the pump body 2 is reduced, and only the rotary shaft 11 of the pump body is externally and heavily sealed; meanwhile, the transmission structure is designed in a hollow space, so that the transmission structure is not exposed in the airflow channel of the pump body 2, and meanwhile, the transmission structure generates heat or damages chippings in the transmission process and cannot influence the airflow; in addition, the two rotating parts in the pump body 2 do not rotate eccentrically in the rotating process, so that the pump body 2 cannot vibrate due to eccentricity, and the pump has a good using effect.

Claims

1. The utility model provides a vacuum pump, includes the base, through motor support mounting motor on the base, through the pump body support mounting pump body on the base, motor shaft passes through the shaft coupling and is connected its characterized in that with pump body pivot power: the pump body comprises a circular shell and air channels symmetrically arranged on two sides of the shell, the air channels are communicated with the interior of the shell, an inner shifting wheel with a plurality of circumferentially uniform shifting teeth is eccentrically arranged in the shell, a rotary plate is arranged at the center of the interior of the shell, a plurality of inner ring teeth are circumferentially uniformly arranged on the outer circular surface of the rotary plate, the side end surface of the inner shifting wheel is contacted with the side end surface of the rotary plate, and the inner shifting wheel is positioned in a ring surrounded by the plurality of inner ring teeth; the side surface of the shell is provided with an arc baffle which is positioned in a gap between the inner thumb wheel and the inner ring teeth; at the symmetrical direction of the arc baffle plate with the center of the shell, the shifting teeth on the inner shifting wheel fully occupy the gap between the adjacent inner ring teeth;

the end face of the rotating plate opposite to the inner shifting wheel is hollow, a second belt wheel is arranged in the hollow inner center of the inner shifting wheel, a first belt wheel is arranged in the center of the rotating plate, the first belt wheel is positioned in the hollow space of the inner shifting wheel, and the first belt wheel and the second belt wheel are in same-direction transmission through a synchronous belt;

2. A vacuum pump according to claim 1, wherein: the shell comprises an outer ring shell, a first cover and a second cover, wherein the first cover and the second cover are installed on two sides of the outer ring shell, a first supporting hole is formed in the center of the first cover, a second supporting hole is formed in the eccentric position of the end face of the second cover, and two air channels are symmetrically installed on the outer ring shell and are symmetrical to two sides of the symmetrical surface of the arc blocking plate.

3. A vacuum pump according to claim 2, wherein: the shell further comprises an end cover and a bearing cover, the end cover is arranged on the end face of the first cover, the end cover is located at the position of the first supporting hole, the bearing cover is arranged on the end face of the second cover, and the bearing cover is located at the position of the second supporting hole.

4. A vacuum pump according to claim 1, wherein: the inner shifting wheel comprises a second clamping shaft, a second supporting shaft, a second belt wheel and a shifting wheel cover, wherein the shifting wheel cover is arranged on one side of the hollow space of the inner shifting wheel; a second clamping shaft is installed on one side of the wheel shifting cover, and a second belt wheel is installed on the other side of the wheel shifting cover through a second supporting shaft.

5. A vacuum pump according to claim 1, wherein: a first belt wheel is installed on one side of the rotary plate through a first supporting shaft, and the other side of the rotary plate is connected with a pump body rotating shaft.

6. A vacuum pump according to claim 4, wherein: the second clamping shaft passes through the second supporting hole and is positioned in the bearing cover, and is installed in the second supporting hole through a bearing.

7. A vacuum pump according to claim 3, wherein: the pump body rotating shaft penetrates through the first supporting hole and is installed in the first supporting hole through the bearing, and the end cover is in rotating fit with the pump body rotating shaft.

8. A vacuum pump according to claim 1, wherein: the central planes of the first belt wheel and the second belt wheel are positioned on the same plane.

9. A vacuum pump according to claim 2, wherein: there is not clearance and have lubricating oil or lubricating grease lubrication between above-mentioned spiral board and the first lid, there is not clearance and have lubricating oil or lubricating grease lubrication between fender arc piece and the spiral board, there is not clearance and have lubricating oil or lubricating grease lubrication between inner ring tooth and the second lid, there is not clearance and have lubricating oil or lubricating grease lubrication between interior thumb wheel and the spiral board.

10. A vacuum pump according to claim 1, wherein: the end face of the circular ring of the inner dial wheel is provided with a plurality of sealing convex rings and a circle of sealing groove at the innermost ring, and the sealing convex rings are matched with the end face of the rotary plate but are not in friction contact; the sealing groove of the inner thumb wheel is provided with a sealing ring which is extruded by the rotary plate.