Air pump drive assembly

Abstract

The application relates to an air pump driving assembly, which comprises a driving device, a piston and a driving mechanism. The driving mechanism drives the input shaft of the driving device to rotate. The driving device is internally concave on the side and comprises an upper rotating disc and a lower rotating disc. The upper end surface of the lower rotating disc is internally concave with a groove, and the lower end surface of the upper rotating disc is internally concave with a groove; the two grooves are buckled to form a ring-shaped groove, and the side of the ring-shaped groove away from the axis of the driving device is provided with an opening. The input shaft is vertically and fixedly connected above the upper rotating disc, the line of the ring-shaped groove comprises a plurality of maintaining curves and a cam curve protruding between two adjacent maintaining curves, and the ball head of the piston is slidingly arranged in the ring-shaped groove. When the cam type air pump of the application is used for pumping, the piston can be fixed when the volume of the piston chamber is maximum, the time is maintained, the pumping time is prolonged, the air pressure in the piston chamber is equal to the external air pressure, and the air intake of the piston chamber is maximized in the pumping stage.

Description

Technical Field

[0001] This invention pertains to air pumps, specifically to an air pump drive assembly. Background Technology

[0002] An air pump, also known as an air compressor or air pressurizer, is a common air booster device widely used in various fields. It is also used in automobiles to provide high-pressure air for air suspension or other mechanisms requiring high-pressure air.

[0003] Most existing air pumps use a piston-connecting rod structure, and the connection method of the piston-connecting rod is the same as that of the engine. When the connecting rod rotates, it drives the piston to slide inside the cylinder, thereby realizing the intake and pressurization exhaust.

[0004] In this piston-connecting rod structure, the piston moves from top dead center to bottom dead center, and then immediately from bottom dead center back to top dead center. The piston's position inside the cylinder is constantly changing, ensuring that the extraction stroke and exhaust stroke take the same amount of time. During the extraction stroke, after reaching bottom dead center, the piston continues to move upward without pausing. This results in the piston chamber not being fully filled with extracted gas; the piston begins to move upward to prepare for exhaust when the internal pressure is still lower than the external pressure. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an air pump drive assembly. When the cam-type air pump of the present invention is pumping air, the piston can be fixed and maintained for a period of time after the volume of the piston chamber is at its maximum, thereby extending the pumping time, so that the air pressure inside the piston chamber is equal to the external air pressure, and the air intake of the piston chamber is maximized during the pumping phase.

[0006] The technical solution adopted by this invention to solve the problems existing in the prior art is:

[0007] An air pump drive assembly, including a drive unit, a piston, and a drive mechanism.

[0008] The drive device is rotatably mounted inside the pump casing, and the upper end of the input shaft of the drive device extends vertically to the outside of the pump casing. The drive mechanism drives the input shaft to rotate.

[0009] The drive device has an annular groove recessed on its side. The drive device includes an upper turntable and a lower turntable arranged sequentially, and the upper turntable and the lower turntable are connected by bolts.

[0010] The upper end face of the lower turntable has a recessed groove, and the lower end face of the upper turntable has a recessed groove. The radial cross-sectional arc of the two annular grooves is greater than or equal to 95° and less than 180°. The two grooves interlock to form an annular groove. The annular groove has an opening on the side facing away from the axis of the drive device.

[0011] The input shaft is vertically and fixedly connected above the upper rotating disc, and the axis of the input shaft is coincident with the axis of the maintaining curve.

[0012] The line of the annular groove comprises a plurality of maintaining curves arranged at intervals and concentrically and equidiameterly, and a cam curve arranged protrudingly between two adjacent maintaining curves, the cam curve comprising a suction curve and an exhaust curve connected in sequence.

[0013] The piston comprises a piston head, a connecting rod and a ball head, the piston head and the ball head are connected with two ends of the connecting rod respectively, the piston head is slidingly arranged inside the cylinder, and the ball head is slidingly arranged inside the annular groove.

[0014] Preferably, the line length of the suction curve is same as that of the exhaust curve, and the curvature of the suction curve is greater than that of the exhaust curve.

[0015] Preferably, the piston head is arranged hollowly inside, a plurality of piston ring grooves are concavely arranged on the outer circular shaft surface of the piston head, and a piston ring is sleeved inside the piston ring groove.

[0016] Preferably, the bottom outer side of the lower rotating disc is sleeved with a gear ring fixedly connected therewith, and the tooth surface of the gear ring is arranged upward.

[0017] The connecting rod is coaxially fixed with a gear, and the gear is meshingly connected with the gear ring.

[0018] Compared with the prior art, the present application has the beneficial effects that:

[0019] (1) The annular groove comprises the suction curve, the exhaust curve and the maintaining curve, the maintaining curve can ensure that the volume of the piston chamber remains unchanged for a period of time, so that the intake time is prolonged and the intake amount is improved.

[0020] (2) The driving device drives the movement of a plurality of pistons, so that at least one cylinder is in exhaust at each moment, thereby ensuring the continuity of exhaust and the stability of pressure of the total exhaust pipe.

[0021] (3) The curvatures of the suction curve and the exhaust curve are different, so that the running speed of the piston during suction is greater than that during exhaust, thereby improving the suction efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in combination with the drawings and examples.

[0023] Figure 1 is a structural diagram of an air pump driving assembly of the present application,

[0024] Figure 2 is Figure 1 a sectional view,

[0025] Figure 3 is Figure 1exploded view of the air pump,

[0026] Figure 4 cam line diagram of the air pump driving assembly of the present application,

[0027] Figure 5 cam profile diagram of the air pump driving assembly of the present application,

[0028] Figure 6 longitudinal exploded view of the cam air pump of the present application,

[0029] Figure 7 transverse exploded view of the cam air pump of the present application,

[0030] Figure 8 cross-sectional view of the cam air pump of the present application,

[0031] Figure 9 pump body profile diagram of the cam air pump of the present application,

[0032] Figure 10 support ring exploded view of the cam air pump of the present application,

[0033] Figure 11 piston cross-sectional view of the cam air pump of the present application,

[0034] Figure 12 cylinder cross-sectional view of the cam air pump of the present application.

[0035] In the figure: 1-pump housing, 101-lower pump housing, 1011-lower connecting semicircular groove, 1012-positioning groove, 102-upper pump housing, 1021-upper connecting semicircular groove, 2-driving device, 201-lower rotating disc, 2011-positioning convex shaft, 202-upper rotating disc, 2021-input shaft, 203-tooth ring, 204-annular groove, 2041-suction curve, 2042-discharge curve, 2043-maintenance curve, 3-piston, 301-piston head, 3011-piston ring groove, 3012-first cooling fin, 302-connecting rod, 3021-stiffening rib, 303-ball head, 304-gear, 4-piston ring, 5-support ring, 501-lower support ring, 5011-semicircular groove, 502-rolling ball, 503-upper fixed ring, 5031-first through hole, 6-cylinder, 601-panel, 602-second cooling fin, 603-cooling cavity, 604-second through hole, 605-inlet, 606-outlet, 608-convex boss, 7-ceramic cylinder sleeve, 8-inlet pipe, 9-valve, 10-exhaust pipe, 11-one-way valve, 12-exhaust connecting pipe, 1201-total exhaust pipe, 13-driving mechanism, 14-fixed support. DETAILED DESCRIPTION

[0036] As used in the specification and claims, certain terms have particular meanings. Those of skill in the art will understand that different manufacturers can refer to a component by different names. The specification and claims should not be construed as limited to the terminology used. Rather, the specification and claims should be construed to cover all components that function the same way, regardless of their nomenclature. As used throughout this specification and in the claims, "comprising" has its broadest meaning, and is interpreted to be "comprising, but not limited to." "Substantially" means within acceptable limits, which those skilled in the art will recognize as within a range that is acceptable for a particular application, and that will achieve essentially the same result.

[0037] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "horizontal", and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present application.

[0038] In the present application, unless specifically defined otherwise and limited in the specification, the terms "mounting", "connected", "connection", "fixed", and the like are to be construed broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The air pump driving assembly of the present application will be further described in detail below in conjunction with the drawings, but not as a limitation on the present application.

[0040] The air pump driving assembly comprises a driving device 2, a piston 3, and a driving mechanism 13.

[0041] The upper end of the input shaft 2021 of the driving device 2 is vertically provided outside the pump housing 1, and the axis of the input shaft 2021 coincides with the axis of the pump housing 1. The driving mechanism 13 drives the input shaft 2021 to rotate, and in this embodiment, the driving mechanism 13 is a motor, the output shaft of which is arranged downward and connected with the input shaft 2021 through a shaft coupling. The driving mechanism 13 is fixedly connected with the outer top surface of the upper pump housing 102 through a fixed support 14. In order to reduce vibration, a damping device such as a damping rubber pad can be additionally provided at the connection between the fixed support 14, the upper pump housing 102, and the driving mechanism 13.

[0042] The side surface of the driving device 2 is concave with an annular groove 204, and the lines of the annular groove include a plurality of spaced-apart, concentric, and equidiameter maintenance curves 2043 and cam curves protruding between adjacent two maintenance curves 2043.

[0043] The piston 3 comprises a piston head 301, a connecting rod 302, and a ball head 303, the piston head 301 and the ball head 303 are connected with two ends of the connecting rod 302 respectively, the piston head 301 is slidably arranged inside the cylinder 6, and the ball head 303 is slidably arranged inside the annular groove 204. The space between the piston head 301 and the face plate 601 of the cylinder 6 is a piston chamber.

[0044] In order to avoid the ball head 303 from falling off during movement, in the embodiment, the inner wall of the radial section of the annular groove 204 has an arc less than or equal to 350° and greater than 180°, thus forming an opening with an arc less than 180°. The diameter of the ball head 303 is the same as the diameter of the radial section of the annular groove 204, so that a part of the ball head 303 leaks to the outside of the annular groove 204 and is fixedly connected with the connecting rod 302. The area of the ball head 303 leaking to the outside of the annular groove 204 is less than half of the total area of the ball head 303, so as to ensure that the ball head 303 is clamped inside the annular groove 204.

[0045] In this way, the rotary driving device 2 drives the ball head 303 to move along the line of the annular groove, and further pushes and pulls the piston head 301. When the ball head 303 is in contact with the cam curve, the piston head 301 is pushed and pulled. When the ball head 303 is in contact with the maintaining curve 2043, the piston head 301 is not moved and is located at the position closest to the axis of the input shaft 2021.

[0046] The cam type air pump based on the air pump driving assembly further comprises a pump shell 1, a cylinder 6, an air inlet pipe 8, and an air outlet pipe 10.

[0047] The pump shell 1 comprises an upper pump shell 102 and a lower pump shell 101 which are connected by buckling, the main bodies of the lower pump shell 101 and the upper pump shell 102 are circular, and the two are fixedly connected by bolts.

[0048] A plurality of lower connecting semicircular grooves 1011 are connected through the outer side of the circumferential surface of the lower pump shell 101, and a plurality of upper connecting semicircular grooves 1021 are connected through the outer side of the circumferential surface of the upper pump shell 102. The lower connecting semicircular grooves 1011 and the upper connecting semicircular grooves 1021 correspond to each other and are connected by buckling, and the lower connecting semicircular grooves 1011 and the upper connecting semicircular grooves 1021 form a circular pipe after buckling.

[0049] The driving device 2 is rotatably arranged inside the pump shell 1, and the rotation axis of the driving device 2 coincides with the axis of the pump shell 1.

[0050] In order to increase the suction effect, the cam curve comprises a suction curve 2041 and an exhaust curve 2042 connected in sequence, the line length of the suction curve 2041 is the same as that of the exhaust curve 2042, and the curvature of the suction curve 2041 is greater than that of the exhaust curve 2042. When the ball head 303 is in contact with the suction curve 2041, the piston chamber space is expanded, and when the ball head 303 is in contact with the exhaust curve 2042, the piston chamber space is reduced. The line length of the suction curve 2041 is the same as that of the exhaust curve 2042, which ensures that the stroke of the piston head 301 is the same, and the curvature of the suction curve 2041 is greater than that of the exhaust curve 2042, so that the moving speed of the piston head 301 during suction is greater than that during exhaust, the suction force is increased, and the suction efficiency is improved.

[0051] The maintenance curve 2043 can also ensure the suction time, further improve the suction efficiency, and ensure that the air pressure in the piston chamber reaches the external air pressure before entering the next exhaust stroke, and the piston chamber is filled with air.

[0052] In order to install the ball head 303 into the annular groove 204, the driving device 2 comprises an upper rotating disc 202 and a lower rotating disc 201 arranged in sequence, and the upper rotating disc 202 and the lower rotating disc 201 are connected by bolts.

[0053] The upper end surface of the lower rotating disc 201 is recessed with a groove, and the lower end surface of the upper rotating disc 202 is recessed with a groove. The radial cross-section arc of the two annular grooves is greater than or equal to 95° and less than 180°, and the two grooves are buckled to form the annular groove 204. The side of the annular groove 204 away from the axis of the driving device 2 is provided with an opening.

[0054] The upper rotating disc 202 is vertically and fixedly connected with an input shaft 2021 above the upper rotating disc 202, and the axis of the input shaft 2021 coincides with the axis of the maintenance curve 2043. The lower rotating disc 201 is provided with a positioning convex shaft 2011 below the lower rotating disc 201, and the axis of the positioning convex shaft 2011 coincides with the axis of the input shaft 2021.

[0055] A plurality of cylinders 6 are through-connected on the outer side of the pump shell 1, the axes of the cylinders 6 are distributed along the radial direction of the maintenance curve 2043, and the cylinders 6 are buckled with the lower connecting semicircular groove 1011 and the upper connecting semicircular groove 1021 to form a circular pipe coaxially through-connected.

[0056] The intake pipe 8 and the exhaust pipe 10 through-connected in the cylinders 6 are arranged on the end surface of the cylinder 6 away from the pump shell 1.

[0057] The intake pipe 8 is connected in series with a valve 9, and the exhaust pipe 10 is connected in series with a one-way valve 11. All the exhaust pipes 10 are through-connected with a total exhaust pipe 1201 through a ring-shaped exhaust connecting pipe 12.

[0058] Valve 9 can be a one-way valve, allowing air to enter cylinder 6 only through intake pipe 8. However, to reduce intake back pressure, in this embodiment, valve 9 is a solenoid valve. A sensor is installed inside pump housing 1, and the sensor controls the opening and closing of the solenoid valve. When piston head 301 moves to the position closest to the axis of maintaining curve 2043, the sensor detects a signal. After detecting the signal, the sensor controls valve 9 to open, drawing air into cylinder 6. The sensor can be a limit switch, fixedly connected to the inner wall of pump housing 1. The sensor model and the connection control method with valve 9 both adopt existing technology.

[0059] Piston head 301 moves away from intake pipe 8, increasing the volume of piston chamber and thus improving the vacuum level. When piston head 301 collides with sensor, valve 9 opens, and external air is drawn into piston chamber under the pressure difference. Then ball head 303 contacts maintenance curve 2043, and piston head 301 remains stationary, maintaining the pumping state for a period of time. This ensures sufficient air volume inside piston chamber until the internal pressure equals the external air pressure. Then ball head 303 contacts cam curve again, and piston head 301 moves towards exhaust pipe 10. Sensor loses signal, and valve 9 closes. When the internal air pressure of piston chamber exceeds one-way valve 11, air from piston chamber is discharged into exhaust pipe 10.

[0060] To enhance the intake effect, in this embodiment, the diameter of the intake pipe 8 is larger than the diameter of the exhaust pipe 10.

[0061] The bottom surface of the lower pump housing 101 also has a positioning groove 1012. A rotating bearing is fitted on the positioning cam 2011 and inserted into the positioning groove 1012.

[0062] When the drive device 2 rotates, if it contacts the inner wall of the pump housing 1, additional frictional resistance will be generated. If it does not contact the pump housing 1, the drive device 2 lacks support and may deviate during rotation, which will cause wear on the input shaft 2021 over a long period of time.

[0063] To address the aforementioned technical problems, in this embodiment, an annular support ring 5 is provided at both the upper and lower ends of the drive device 2. The support ring 5 includes a lower support ring 501, a ball bearing 502, and an upper fixing ring 503. The lower support ring 501 has several semi-circular grooves 5011 recessed on its end face, and the ball bearing 502 is rotatably disposed within these grooves. The upper fixing ring 503 has several first through holes 5031. The upper fixing ring 503 and the lower support ring 501 are fixedly connected by bolts, and a portion of the ball bearing 502 passes through the first through holes 5031 to the outside of the upper fixing ring 503. The first through holes 5031 have a frustum-shaped cross-section to prevent the ball bearing 502 from detaching. The lower support ring 501 is fixedly connected to the inner wall of the pump housing 1, and the ball bearing 502 abuts against the upper and lower end faces of the drive device 2.

[0064] In this way, the two support rings 5 ​​clamp the drive device 2 in the middle, which plays a supporting and limiting role. The ball bearings 502 can rotate freely, which can also reduce the frictional resistance when the drive device 2 rotates.

[0065] To reduce the weight of piston 3, the piston head 301 is hollow inside and open at one end facing the ball head 303. Several piston ring grooves 3011 are recessed on the outer cylindrical surface of piston head 301, and at least three piston rings 4 are fitted inside the piston ring grooves 3011. The piston rings 4 increase the airtightness of the piston chamber.

[0066] To increase the connection strength between the connecting rod 302 and the piston head 301, the connecting rod 302 is connected to the inner wall of the piston head 301 cavity by several reinforcing ribs 3021 arranged intersecting with it. The piston head 301 generates heat during use; if this heat cannot be dissipated in time, it will increase the internal temperature of the piston chamber, thereby reducing the gas capacity inside the piston chamber. Therefore, in this embodiment, several annular first heat sinks 3012 are provided in the inner wall of the piston head 301 cavity.

[0067] The cylinder 6 is open at both ends. One open end engages with the lower connecting semicircular groove 1011 and the upper connecting semicircular groove 1021 in the pump housing 1 to form a through-tube connection. The cylinder 6 and the pump housing 1 are fixedly connected by bolts, and sealant is applied or a sealing gasket is placed at the connection. The other open end is equipped with a panel 601. The contact surface between the panel 601 and the cylinder 6 is covered with sealant, and the two are fixedly connected by bolts.

[0068] The intake pipe 8 and the exhaust pipe 10 are fixedly connected to the panel 601 and are connected through the piston chamber.

[0069] An annular boss 608 protrudes from the inner side of the end where the cylinder 6 connects to the pump housing 1. A ceramic cylinder liner 7 is engaged between the annular boss 608 and the panel 601. The piston head 301 is slidably disposed inside the ceramic cylinder liner 7. The ceramic cylinder liner 7 can increase wear resistance and prevent cylinder scoring.

[0070] The cylinder 6 has an annular heat dissipation cavity 603 in its inner wall, and the heat dissipation cavity 603 has a plurality of second through holes 604 on its end face facing the ceramic cylinder sleeve 7.

[0071] The cylinder 6 has an inlet 605 on its bottom surface that is connected to the heat dissipation cavity 603, and an outlet 606 on its top surface that is also connected to the heat dissipation cavity 603. The heat dissipation cavity 603 can be filled with cooling water for forced cooling, or it can be naturally cooled by airflow. Whether forced or natural cooling is used, the cooling medium enters through the inlet 605 and exits through the outlet 606, which are located diagonally opposite each other.

[0072] In this embodiment, the diameter of the inlet 605 is larger than the diameter of the outlet 606, and the outlet 606 is frustum-shaped. Natural cooling is employed; air enters through the inlet 605, is heated, and then exits through the outlet 606. The outlet 606 has a diameter that is narrower at the top and wider at the bottom, which facilitates a chimney effect, increasing airflow velocity and thus improving cooling efficiency. To further enhance cooling, several second heat sinks 602 are provided on the outer wall of the cylinder 6.

[0073] To further reduce wear on the ceramic cylinder liner 7 during piston head 301 movement, a gear ring 203 is fitted onto the outer bottom of the lower rotary disk 201 and fixedly connected thereto, with the toothed surfaces of the gear ring 203 facing upwards. A gear 304 is coaxially fixed on the connecting rod 302, and the gear 304 meshes with the gear ring 203. Therefore, rotation occurs when the piston head 301 moves back and forth, further reducing the probability of wear.

[0074] In this embodiment, at least three cylinders 6 are provided. At the same time, by setting the suction curve 2041, exhaust curve 2042 and maintenance curve 2043 on the annular groove 204, one cylinder 6 exhausts gas outward at all times, so that the gas discharged from the main exhaust pipe 1201 is continuous and the pressure is stable.

[0075] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An air pump driving assembly, characterized in that: it comprises a driving device (2), a piston (3) and a driving mechanism (13), the driving mechanism (13) drives the input shaft (2021) of the driving device (2) to rotate, the driving device (2) is internally concave with a ring-shaped groove (204), the driving device (2) comprises an upper turntable (202) and a lower turntable (201) arranged in sequence, the upper turntable (202) and the lower turntable (201) are connected through bolts, the upper end surface of the lower turntable (201) is internally concave with a groove, the lower end surface of the upper turntable (202) is internally concave with a groove, the radial section of the two annular grooves is greater than or equal to 95° and less than 180°, the two grooves are buckled to form the ring-shaped groove (204), the side of the ring-shaped groove (204) away from the axis of the driving device (2) is provided with an opening, the input shaft (2021) is vertically and fixedly connected above the upper turntable (202), the axis of the input shaft (2021) coincides with the axis of the maintenance curve (2043), the line of the annular groove comprises a plurality of maintenance curves (2043) arranged at intervals and concentrically and a cam curve arranged protruding between the two adjacent maintenance curves (2043), the cam curve comprises an air extraction curve (2041) and an air exhaust curve (2042) connected in sequence, the piston (3) comprises a piston head (301), a connecting rod (302) and a ball head (303), the piston head (301) and the ball head (303) are connected with the two ends of the connecting rod (302) respectively, the piston head (301) is slidingly arranged inside a cylinder (6), and the ball head (303) is slidingly arranged inside the ring-shaped groove (204), the bottom outer side of the lower turntable (201) is sleeved with a gear ring (203) fixedly connected therewith, the tooth surface of the gear ring (203) is arranged upward, and the connecting rod (302) is coaxially fixed with a gear (304) engaged with the gear ring (203).

2. The air pump driving assembly according to claim 1, characterized in that: the piston head (301) is internally hollow, a plurality of piston ring grooves (3011) are concavely arranged on the outer circular shaft surface of the piston head (301), and a piston ring (4) is sleeved inside the piston ring groove (3011).

3. The air pump driving assembly according to claim 2, characterized in that: a ring-shaped supporting ring (5) is arranged at each of the upper and lower ends of the driving device (2).

4. The air pump driving assembly according to claim 3, characterized in that: the supporting ring (5) comprises a lower supporting ring (501), a ball (502) and an upper fixed ring (503), a plurality of semicircular grooves (5011) are concavely arranged on the end surface of the lower supporting ring (501), and the ball (502) is rotationally arranged inside the semicircular groove (5011), a plurality of first through holes (5031) are arranged on the upper fixed ring (503), the upper fixed ring (503) is fixedly connected with the lower supporting ring (501) through bolts, and a part of the ball (502) leaks to the outside of the upper fixed ring (503) through the first through hole (5031). ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. The air pump drive assembly of claim 4, wherein: The cross section of the first through hole (5031) is in the shape of a circular truncated cone, which can avoid the ball (502) from being separated, and the ball (502) abuts against the upper and lower end faces of the driving device (2).

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