Low noise vacuum pump

Abstract

The utility model discloses a low noise vacuum pump, including upper cover, middle plate, cylinder, fixed base, eccentric swing frame subassembly, leather bowl subassembly and drive subassembly, leather bowl subassembly includes the base plate and the leather bowl of forming in the base plate bottom, eccentric swing frame subassembly includes eccentric shaft and eccentric swing frame, and is equipped with the piston corresponding with leather bowl on eccentric swing frame, drive subassembly is linked with eccentric shaft to drive eccentric shaft to do eccentric rotation movement, and make eccentric swing frame drive piston extrude leather bowl and carry out pumping, fixed base is provided with three empty grooves, and the depth of empty groove is less than the thickness of fixed base, make in the pumping process, piston and leather bowl do not contact with the groove wall of empty groove, avoid the piston, leather bowl and the groove wall of empty groove collision and produce the noise on one side, on the other hand, the design makes in the pumping process, piston angle movement is more smooth and sufficient to the high vacuum pressure of vacuum pump is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a low-noise vacuum pump. Background Technology

[0002] In the structural design of traditional vacuum pumps, the relationship between the cavity depth and the thickness of the fixed base lacks proper planning. Specifically, the unreasonable design of the cavity depth leads to inevitable direct contact between the piston and the piston cup and the cavity wall during the pumping operation. This contact has several adverse effects. First, the frequent collisions between the piston and the piston cup and the cavity wall during vacuum pump operation generate significant noise. Second, the contact between the piston and the piston cup and the cavity wall severely restricts the piston's movement. During pumping, the piston's angular movement is hindered by the cavity wall, preventing smoother and more sufficient movement. This directly limits the performance of the vacuum pump, specifically making it difficult to effectively increase high vacuum pressure. Utility Model Content

[0003] In order to overcome the shortcomings of existing technical solutions, this utility model provides a low-noise vacuum pump, which can effectively solve the technical problems mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a low-noise vacuum pump, including an upper cover, a middle plate, a cylinder, a fixed base, an eccentric swing frame assembly, a cup assembly, and a drive assembly. The cup assembly includes a base plate and a cup formed on the bottom of the base plate. The eccentric swing frame assembly includes an eccentric shaft and an eccentric swing frame, and the eccentric swing frame is provided with a piston corresponding to the cup. The drive assembly is connected to the eccentric shaft to drive the eccentric shaft to perform eccentric rotation, and to make the eccentric swing frame drive the piston to squeeze the cup for pumping. The fixed base is provided with three empty slots, and the depth of the empty slots is less than the thickness of the fixed base, so that the piston and the cup will not contact the slot wall during the pumping process.

[0005] Furthermore, the substrate has a positioning groove on its outer edge and a positioning protrusion on its outer edge. The number of positioning protrusions is the same as the number of positioning grooves and their positions correspond. The substrate is assembled on the fixed base, and the inner wall of the positioning protrusion fits into the groove wall of the positioning groove.

[0006] Furthermore, each of the leather cups is located inside a corresponding empty groove, and there is a height gap between the leather cup and the bottom end face of the empty groove, so that the leather cup will not collide with the bottom end of the empty groove during movement.

[0007] Furthermore, the inner wall of the fixed seat is provided with three arc-shaped clearance grooves, so that the piston will not collide with the inner wall of the fixed seat during the pumping process.

[0008] Furthermore, the upper cover, middle plate, fixed seat and cylinder are connected in sequence to form a pump body structure, and the upper cover is provided with a gas inlet and a gas outlet.

[0009] Furthermore, the middle plate is provided with at least one exhaust channel, and the middle plate is equipped with an umbrella-shaped prong, the bottom end of which is provided with a movable rod that is movably connected to the exhaust channel.

[0010] Furthermore, the bottom end of the movable rod is provided with a limiting part integrally formed therewith, and the outer diameter of the limiting part is larger than the diameter of the exhaust channel.

[0011] Furthermore, the upper cover is formed with a protrusion, the upper cover is assembled on the middle plate, the bottom end face of the protrusion is closely fitted with the upper end face of the middle plate, and the protrusion is arranged around the umbrella stud.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The depth of the empty groove is less than the thickness of the fixed seat, so that the piston and the cup will not come into contact with the groove wall during the pumping process of the piston squeezing the cup. On the one hand, this avoids the collision between the piston, cup and the groove wall, which will generate noise. On the other hand, this design makes the piston angle movement smoother and more sufficient during the pumping process, thereby improving the high vacuum pressure of the vacuum pump. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overall structure of a low-noise vacuum pump; Figure 2 An exploded view of the structure of a low-noise vacuum pump from a first angle; Figure 3 An exploded view of the structure of a low-noise vacuum pump from a second angle; Figure 4 This is a schematic diagram of the combined structure of the eccentric swing frame assembly and the fixed base; Figure 5 This is a schematic diagram of the umbrella-shaped structure.

[0014] Numbering on the map: 1. Top cover; 2. Gas inlet; 3. Gas outlet; 4. Middle plate; 5. Base plate; 6. Fixing seat; 7. Cylinder; 8. Drive assembly; 9. Umbrella pin; 10. Exhaust channel; 11. Positioning groove; 12. Bowl mouth; 13. Positioning protrusion; 14. First exhaust groove; 15. Empty groove; 16. Eccentric swing frame; 17. Second exhaust groove; 18. Piston; 19. Sealing ring; 21. Moving rod; 22. Limiting part; 23. Clearance groove; 24. Leather cup; 25. Flat key; 26. Protrusion. Detailed Implementation

[0015] 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 protection scope of the present utility model.

[0016] like Figure 1-5 As shown, this utility model provides a low-noise vacuum pump, including an upper cover 1, a middle plate 4, a cylinder 7, a fixed base 6, an eccentric swing frame assembly, a leather cup assembly, and a drive assembly 8; The cylinder 7 has an opening at the top and a through hole at the bottom. The drive assembly 8 is a rotary drive motor. The output shaft of the rotary drive motor passes through the through hole, and a sealing ring 19 is fitted on the outside of the output shaft. The rotary drive motor serves as the power source for the vacuum pump. By outputting rotational power, it drives the eccentric swing frame assembly to perform eccentric swing motion, thereby driving the cup assembly to work and realizing the pumping function of the vacuum pump. The leather cup assembly includes a substrate 5 and a leather cup 24 formed on the bottom of the substrate 5. In this embodiment, the number of leather cups 24 is three, and each leather cup 24 corresponds to a bowl opening 12 on the substrate 5. The leather cup 24 is made of a highly elastic and corrosion-resistant rubber material. The eccentric swing frame assembly includes an eccentric shaft and an eccentric swing frame 16. The eccentric swing frame 16 is located below the leather cup 24. The eccentric swing frame 16 is connected to the eccentric shaft via a flat key 25 to ensure that the eccentric swing frame 16 can stably follow the movement when the eccentric shaft rotates. The eccentric swing frame 16 is equipped with three pistons 18 corresponding to the leather cup 24, and the end shape of the pistons 18 is adapted to the leather cup 24. The drive assembly 8 is connected to the eccentric shaft to drive the eccentric shaft to perform eccentric rotational movement, and causes the eccentric swing frame 16 to drive the pistons 18 to squeeze the leather cup 24 for pumping. The upper cover 1, middle plate 4, fixed seat 6 and cylinder body 7 are stacked and connected in sequence to form a closed pump body structure. The fixed seat 6 is provided with three empty slots 15, the positions of which correspond to the positions of the cup 24. The size of the empty slots 15 is larger than that of the cup 24, providing sufficient space for the movement of the cup 24. The fixed seat 6 is assembled on the cylinder body 7 and the two are connected by bolts. The bottom end of the cup 24 is provided with an opening, and the space at the bottom opening of the cup 24 is connected to the inside of the cylinder body 7. The top end of the cup 24 is provided with a first exhaust groove 14, which is semi-circular in shape. The bottom end of the piston 18 is open and the top end is provided with a second exhaust groove 17. The end of the piston 18 away from the eccentric swing frame 16 extends into the inside of the cup 24. The substrate 5 is provided with a positioning groove 11 on its outer edge, and the fixing seat 6 is provided with a positioning protrusion 13 on its outer edge. The number of positioning protrusions 13 is the same as the number of positioning grooves 11 and their positions are corresponding. When the substrate 5 is assembled on the fixing seat 6, the inner wall of the positioning protrusion 13 fits against the groove wall of the positioning groove 11, so as to achieve precise positioning of the substrate 5 and the fixing seat 6. At the same time, each cup 24 is located inside the corresponding empty groove 15, and the cup 24 and the bottom end face of the empty groove 15 have a height gap. This design allows the cup 24 to have sufficient buffer space during movement, avoiding collision due to direct contact with the bottom end of the empty groove 15. The middle plate 4 has at least one exhaust channel 10 that extends through its thickness. The middle plate 4 is equipped with umbrella pins 9 corresponding to the number of the inner grooves. The bottom end of the umbrella pins 9 is provided with a movable rod 21 that is movably connected to the exhaust channel 10. The bottom end of the movable rod 21 is provided with a limiting part 22 integrally formed therewith. The limiting part 22 is spherical and its outer diameter is larger than the aperture of the exhaust channel 10, so that the movable rod 21 cannot be removed from the middle plate 4. When there is no gas impact, the umbrella pins 9 completely cover the exhaust channel 10 under their own gravity, thus acting as a one-way valve. The upper cover 1 is provided with a gas inlet 2 and a gas outlet 3. The gas inlet 2 is used to draw in gas, and the gas outlet 3 is used to discharge gas. The upper cover 1 is formed with a protrusion 26. The upper cover 1 is assembled on the middle plate 4. The bottom end face of the protrusion 26 is tightly fitted with the upper end face of the middle plate 4. Furthermore, the protrusion 26 is arranged around the umbrella pin 9 to form a receiving chamber. The gas outlet 3 is connected to the receiving chamber. In this embodiment, the depth of the empty groove 15 is less than the thickness of the fixed seat 6, so that during the pumping process of the piston 18 squeezing the cup 24, the piston 18 and the cup 24 will not come into contact with the groove wall of the empty groove 15. When the drive assembly 8 drives the eccentric shaft to perform eccentric rotation, the eccentric swing frame 16 swings upward accordingly. During this process, the piston 18 pushes the cup 24 upward. Since the cup 24 is made of highly elastic rubber material, the top of the cup 24 undergoes controllable deformation when subjected to force. The internal volume of the cup 24 expands rapidly to form a negative pressure cavity. At this time, the air outside the cylinder 7 is drawn into the cylinder 7 through the gas inlet 2 under the action of negative pressure and enters the space formed by the bottom opening of the cup 24, completing the air intake process. When the eccentric swing arm 16 swings downward, the piston 18 and the cup 24 are no longer in contact. Due to its elastic properties, the cup 24 quickly recovers its deformation and the internal volume of the cup 24 decreases. At this time, the gas drawn into the cup 24 is compressed and the pressure increases. The compressed gas is pumped upward along the first exhaust groove 14. The gas pressure overcomes the gravity of the umbrella pin 9 and pushes it away from the middle plate 4, so that the gas flows into the receiving cavity from the gap between the umbrella pin 9 and the end face of the middle plate 4, and finally is discharged from the gas outlet 3. In the above process, since the piston 18 and the cup 24 do not come into contact with the wall of the empty groove 15, on the one hand, the collision between the piston 18, the cup 24 and the groove wall is avoided, which would generate noise. On the other hand, this design makes the angular movement of the piston 18 smoother and more sufficient during the pumping process, thereby improving the high vacuum pressure of the vacuum pump. More preferably, the inner wall of the fixed seat 6 is provided with three arc-shaped clearance grooves 23, which provide sufficient movement space for the piston 18. This ensures that the piston 18 will not collide with the inner wall of the fixed seat 6 during the pumping process of the piston 18 squeezing the cup 24. It also allows the piston 18 to have a larger angular change and stroke space during movement. Sufficient piston stroke can increase the volume change of the pumping, thereby improving the pumping efficiency of the vacuum pump and enabling it to reach the required high vacuum pressure more quickly.

[0017] Compared to traditional technologies: The depth of the empty groove 15 is less than the thickness of the fixed seat 6, so that during the pumping process of the piston 18 squeezing the cup 24, the piston 18 and the cup 24 will not come into contact with the groove wall of the empty groove 15. When the drive assembly 8 drives the eccentric shaft to perform eccentric rotation, the eccentric swing arm 16 swings upward accordingly. During this process, the piston 18 pushes the cup 24 upward. Since the cup 24 is made of highly elastic rubber material, the top of the cup 24 undergoes controllable deformation when subjected to force, and the internal volume of the cup 24 rapidly expands to form a negative pressure cavity. At this time, the air outside the cylinder 7 is drawn in through the gas inlet 2 under the action of negative pressure. The gas enters the cylinder 7 and enters the space formed by the bottom opening of the cup 24 to complete the intake process. When the eccentric swing arm 16 swings downward, the piston 18 and the cup 24 are no longer in contact. Due to its elastic properties, the cup 24 quickly recovers its deformation and the internal volume of the cup 24 decreases. At this time, the gas drawn into the cup 24 is compressed and the pressure increases. The compressed gas is pumped upward along the first exhaust groove 14. The gas pressure overcomes the gravity of the umbrella pin 9 and pushes it away from the middle plate 4, so that the gas flows into the receiving cavity from the gap between the umbrella pin 9 and the end face of the middle plate 4, and finally is discharged from the gas outlet 3. In the above process, since the piston 18 and the cup 24 will not come into contact with the wall of the empty groove 15, on the one hand, the piston 18 and the cup 24 are avoided from colliding with the groove wall and generating noise. On the other hand, this design makes the piston 18 move more smoothly and fully during the pumping process, thereby improving the high vacuum pressure of the vacuum pump.

[0018] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A low-noise vacuum pump, comprising a top cover, a middle plate, a cylinder, a fixed base, an eccentric swing arm assembly, a cup assembly, and a drive assembly. The cup assembly includes a base plate and a cup formed on the bottom of the base plate. The eccentric swing arm assembly includes an eccentric shaft and an eccentric swing arm, and the eccentric swing arm is provided with a piston corresponding to the cup. The drive assembly is connected to the eccentric shaft to drive the eccentric shaft to perform eccentric rotational motion, thereby causing the eccentric swing arm to drive the piston to squeeze the cup for pumping. The pump is characterized in that... The mounting base has three empty slots, and the depth of the empty slots is less than the thickness of the mounting base, so that the piston and the cup will not come into contact with the slot walls during pumping.

2. The low-noise vacuum pump according to claim 1, characterized in that, The substrate has a positioning groove on its outer edge, and the fixing seat has a positioning protrusion on its outer edge. The number of positioning protrusions is the same as the number of positioning grooves and their positions correspond. The substrate is assembled on the fixing seat, and the inner wall of the positioning protrusion fits into the groove wall of the positioning groove.

3. A low-noise vacuum pump according to claim 2, characterized in that, Each of the aforementioned leather cups is located inside a corresponding empty groove, and there is a height gap between the leather cup and the bottom end face of the empty groove, so that the leather cup will not collide with the bottom end of the empty groove during movement.

4. A low-noise vacuum pump according to claim 3, characterized in that, The inner wall of the fixed seat is provided with three arc-shaped clearance grooves, so that the piston will not collide with the inner wall of the fixed seat during the pumping process.

5. A low-noise vacuum pump according to claim 1, characterized in that, The upper cover, middle plate, fixed base and cylinder are connected in sequence to form a pump body structure, and the upper cover is provided with a gas inlet and a gas outlet.

6. A low-noise vacuum pump according to claim 5, characterized in that, The middle plate has at least one exhaust channel, and the middle plate is equipped with an umbrella pin, the bottom of which is provided with a movable rod that is movably connected to the exhaust channel.

7. A low-noise vacuum pump according to claim 6, characterized in that, The bottom end of the movable rod is provided with a limiting part integrally formed therewith, and the outer diameter of the limiting part is larger than the diameter of the exhaust channel.

8. A low-noise vacuum pump according to claim 6, characterized in that, The top cover is formed with a protrusion. The top cover is assembled on the middle plate. The bottom end of the protrusion is in close contact with the top end of the middle plate. Furthermore, the protrusion is arranged around the umbrella stud.

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