Patent Application
20250180009
The present invention relates to the technical field of vacuum pumping devices and, more particularly to a miniature vacuum pump and a miniature vacuum device.
Existing small household appliances, such as small vacuum packaging machines and electric breast pumps, require vacuum pumping devices. Due to different performance indicators, such as power, vacuum degree, service life, noise, volume, and safety, large vacuum pumps and vacuum pumping devices widely used in industry or commerce are not suitable, and miniature vacuum pumping devices are required.
A current miniature vacuum device usually includes a miniature vacuum pump, an electromagnetic valve, and a controller. A suction nozzle of the vacuum pump is connected to a corresponding vacuum container through a corresponding suction pipeline. The electromagnetic valve is usually a three-way valve and is connected to the suction pipeline. A first port and a second port of the electromagnetic valve are respectively connected to the suction nozzle and the vacuum container, and a third port of the electromagnetic valve is connected to the outside. When vacuum is needed, the controller firstly controls the electromagnetic valve to connect the first port to the second port and close the third port, and then controls a driving motor of the vacuum pump to drive an exhaust assembly to operate to suck out the air inside the vacuum container, so as to achieve vacuum operation. When vacuum is not required, the controller controls the electromagnetic valve to connect the second port to the third port, allowing external air to enter the vacuum container.
However, in the specific implementation, the current miniature vacuum device uses the electromagnetic valve to achieve vacuum breaking operations on the vacuum container, and the electromagnetic valve is prone to exhaust vibrations during operation, resulting in significant noise, and moreover, the occupation volume and cost of the electromagnetic valve is relatively large, which is not conducive to the miniaturization of the miniature vacuum device and the reduction of production costs.
Therefore, the technical problem to be solved by the embodiments of the present invention is to provide a miniature vacuum pump that can perform vacuum breaking operations without relying on electromagnetic valves.
The technical problem to be further solved by the embodiments of the present invention is to provide a miniature vacuum device that can achieve vacuum breaking without the need for electromagnetic valves, and can effectively reduce volume, production costs, and work noise.
To solve the above-mentioned technical problems, an embodiment of the present invention provides the following solutions. A miniature vacuum pump includes a collection and exhaust chamber defining an intake nozzle and an exhaust hole, a leather bowl assembly assembled in an inner space of the collection and exhaust chamber, a driving motor with an output shaft extending through a bottom wall of the collection and exhaust chamber to enter into the inner space and be connected to the leather bowl assembly so as to drive the leather bowl assembly to operate, and a vacuum breaking assembly.
The vacuum breaking assembly includes an inlet hole, a pressure plate, a rotation member, and a centrifugal swing rod.
The inlet hole extends through the bottom wall of the collection and exhaust chamber.
The pressure plate movably fits about a part of the output shaft located in the collection and exhaust chamber, and flexibly covers the inlet hole.
The rotation member is coaxially and fixedly mounted to the output shaft and located at a side of the pressure plate opposite to the bottom wall, and a rotation frame protrudes from a lateral side of the rotation member.
A middle of the centrifugal swing rod is rotatably mounted to the rotation frame at the lateral side of the rotation member through a rotation shaft, the rotation shaft is perpendicular to the output shaft, a center of gravity of the centrifugal swing rod is set at an end away from the rotation member, an end of the centrifugal swing rod close to the rotation member is bent and extended toward the pressure plate to form a pressing portion for abutting against the pressure plate.
Furthermore, the vacuum breaking assembly further comprises an elastic member with one end being fixed relative to the collection and exhaust chamber and the other end abutting against a side surface of the pressure plate facing the bottom wall, to abut against the pressure plate in a direction away from the bottom wall, so as to allow the inlet hole to communicate with the inner space of the collection and exhaust chamber.
Furthermore, a plurality of said rotation frames is symmetrically arranged on the lateral side of the rotation member about a central axis of the rotation member, and each rotation frame is rotatably equipped with one said centrifugal swing rod.
Furthermore, a gap is defined between the pressure plate and a bottom surface of the rotation member in an axial direction of the output shaft, and a distal end of the pressing portion is inserted into the gap and abutted against the bottom surface of the rotation member when the output shaft is not rotating.
Furthermore, a sealing gasket is provided at a position where the side surface of the pressure plate facing the bottom wall is directly opposite to the inlet hole.
Furthermore, an outer wall surface of the bottom wall is correspondingly recessed to form a noise reduction groove, one end of which communicates with an outer end opening of the inlet hole and the other end of which defines a slot on an outer side of the collection and exhaust chamber; wherein the noise reduction groove is filled with soundproof cotton.
Furthermore, the pressure plate defines a guide hole that is axially parallel to the output shaft, the bottom wall is correspondingly provided with a protruded guide rod that is parallel to the output shaft and correspondingly extends through the guide hole.
Furthermore, a middle of the pressure plate defines a through hole, and a support sleeve is fixedly assembled inside the through hole; the output shaft extends through a sleeve hole in a middle of the support sleeve and is movably arranged relative to the sleeve hole in the axial direction.
Furthermore, a middle of the bottom wall defines a stepped hole, One end of the stepped hole connected to the inner space of the collection and exhaust chamber is a thin diameter end, and the other end away from the collection and exhaust chamber is a thick diameter end; the output shaft extends into the inner space of the collection and exhaust chamber through the stepped hole; wherein a sealing gasket is also assembled inside the thick diameter end, one side of the sealing gasket is abutted against a connecting step surface between the thin diameter end and the thick diameter end, and a contact ring is protruded about an inner hole of the sealing gasket on an opposite side of the sealing gasket for correspondingly abutting against an end face of the driving motor.
Furthermore, the elastic member is a spiral compression spring that is correspondingly fitted about the output shaft, a protruded ring protrudes from a middle of the side surface of the pressure plate, surrounding the through hole; one end of the elastic member is fitted about the protruded ring, while the other end extends through the stepped hole and the inner hole of the sealing gasket and then is fitted about a shaft seat arranged on the end face of the driving motor for the output shaft extending through.
Furthermore, an outer wall surface of the bottom wall defines two positioning holes at opposite sides of the thick diameter end, and two positioning protrusions protrude from opposite sides of the sealing gasket, the positioning protrusions are correspondingly engaged in the positioning holes, to position the sealing gasket.
On the other hand, to solve the above-mentioned technical problems, an embodiment of the present invention further provides the following solutions. A miniature vacuum device includes a miniature vacuum pump as any one of the above-mentioned miniature vacuum pump, and a controller connected to the driving motor of the miniature vacuum pump, for controlling the operation state of the driving motor.
By adopting the above technical solution, embodiments of the present invention have at least the following beneficial effects. The miniature vacuum pump in the embodiments of the present invention adds a vacuum breaking component. Specifically, the bottom wall of the collection and exhaust chamber defines the inlet hole, and the inlet hole is flexibly covered by the pressure plate; when the miniature vacuum pump needs to perform vacuum pumping operation and starts the driving motor, because the center of gravity of the centrifugal swing rod is set at the end away from the rotation member, the output shaft of the driving motor rotates to drive the rotation member to rotate, causing the centrifugal swing rod to deflect about the rotation shaft under the action of centrifugal force; at this time, the pressing portion of the centrifugal swing rod close to the rotation member immediately abuts against the pressure plate, so that the pressure plate overcomes the elastic force of the elastic member and covers the inlet hole, thereby isolating the inner space of the collection and exhaust chamber from the outside atmosphere and achieving normal vacuum pumping operation; when the miniature vacuum pump needs to perform vacuum breaking operation and the driving motor is shut down, the output shaft of the driving motor and the rotation member stop rotating, the centrifugal force disappears, and the pressing portion of the centrifugal swing rod no longer applies pressure to the pressure plate; due to the pressure difference between the inner space of the collection and exhaust chamber and the outside atmosphere, the pressure plate is pushed open by the outside atmosphere, and the inlet hole is opened to allow the inner space of the collection and exhaust chamber to communicate with the outside atmosphere; the outside atmosphere enters the inner space of the collection and exhaust chamber through the inlet hole, achieving vacuum breaking operation without relying on electromagnetic valves, reducing production costs and working noise.
The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the following illustrative embodiments and illustrations are only used to explain the present invention and are not intended to limit the present invention, and that the embodiments of the present invention and the features of the embodiments can be combined with each other without conflict.
Referring to
The inlet hole 70 extends through the bottom wall 1b of the collection and exhaust chamber 1.
The pressure plate 72 is movably fitted about a part of the output shaft 50 located in the collection and exhaust chamber 1, and flexibly covers the inlet hole 70.
The rotation member 74 is coaxially and fixedly assembled on the output shaft 50 and located at a side of the pressure plate 72 away from the bottom wall 1b. A rotation frame 741 extends from a lateral side of the rotation member 74.
A middle of the centrifugal swing rod 76 is rotatably mounted to the rotation frame 741 at the lateral side of the rotation member 74 through a rotation shaft 76a. The rotation shaft 76a is perpendicular to the output shaft 50. A center of gravity of the centrifugal swing rod 76 is set at an end away from the rotation member 74. An end of the centrifugal swing rod 76 close to the rotation member 74 is bent and extended toward the pressure plate 72 to form a pressing portion 761 for abutting against the pressure plate 72.
The miniature vacuum pump A in the embodiment adds the vacuum breaking assembly 7. Specifically, the inlet hole 70 is defined in the bottom wall of the collection and exhaust chamber 1, and the inlet hole 70 is flexibly covered by the pressure plate 72. When the miniature vacuum pump A needs to perform vacuum pumping operation and the driving motor 5 is started, because the center of gravity of the centrifugal swing rod 76 is set at the end away from the rotation member 74, the output shaft 50 of the driving motor rotates to drive the rotation member 74 to rotate, so as to cause the centrifugal swing rod 76 to deflect about the rotation shaft 76a under the action of centrifugal force. At this time, the pressing portion 761 of the centrifugal swing rod 76 close to the rotation member 74 immediately abuts against the pressure plate 72, thereby allowing the pressure plate 72 to overcome the elastic force of an elastic member 78 and then to cover the inlet hole 70, so as to isolate the inner space 1a of the collection and exhaust chamber 1 from the outside atmosphere, and achieve normal vacuum pumping operation. When the miniature vacuum pump A needs to perform vacuum breaking operation and the driving motor 5 is shut down, the output shaft 50 of the driving motor 5 and the rotation member 74 stop rotating, the centrifugal force disappears and the pressing portion 761 of the centrifugal swing rod 76 no longer applies abutting force on the pressure plate 72. Due to the pressure difference between the inner space 1a of the collection and exhaust chamber 1 and the outside atmosphere, the pressure plate 72 is pushed open by the outside atmosphere, and the air of the outside atmosphere enters the inner space 1a of the collection and exhaust chamber 1 through the inlet hole 70, achieving vacuum breaking operation without relying on electromagnetic valves, reducing production costs and working noise.
In specific implementation, it can be understood that when the output shaft 50 of the driving motor 5 rotates at a predetermined angular velocity to drive the centrifugal swing rod 76 to swing and push the pressure plate 72 to cover the inlet hole 70, the centrifugal swing rod 76 is in a state of force balance. Therefore, whether the miniature vacuum pump is in a tilted or inverted state, the output shaft 50 rotates at the predetermined angular velocity to drive the centrifugal swing rod 76 to swing, which will also cause the centrifugal swing rod 76 to swing to the corresponding position and balance. At this time, the centrifugal swing rod 76 also pushes the pressure plate 72 to cover the inlet hole 70.
In another embodiment of the present invention, as shown in
One end of the elastic member 78 is fixed relative to the collection and exhaust chamber 1, and the other end is abutted against a side surface of the pressure plate 72 facing the bottom wall 1b, used to abut against the pressure plate 72 in a direction away from the bottom wall 1b to allow the inlet hole 70 to communicate with the inner space 1a of the collection and exhaust chamber 1. In the embodiment, when the output shaft 50 of the driving motor 5 and the rotation member 74 stop rotating, the centrifugal force disappears, and the pressing portion 761 of the centrifugal swing rod 76 no longer applies abutting force on the pressure plate 72. The pressure plate 72 returns to its initial position with the assistance of the elastic force of the elastic member 78, and the inlet hole 70 opens to allow the inner space 1a of the collection and exhaust chamber 1 to communicate with the outside atmosphere. The air of the outside atmosphere enters the inner space 1a of the collection and exhaust chamber 1 through the inlet hole 70, achieving vacuum breaking operation.
In another embodiment of the present invention, as shown in
In specific implementation, the rotation frames 741 are symmetrically arranged on the lateral side of the rotation member 74, and each rotation frame 741 is rotatably mounted with one said centrifugal swing rod 76.
In another embodiment of the present invention, as shown in
In another embodiment, as shown in
In another embodiment of the present invention, as shown in
In another embodiment of the present invention, as shown in
In another embodiment of the present invention, as shown in
In another embodiment of the present invention, as shown in
In another embodiment of the present invention, as shown in
In another embodiment of the present invention, as shown in
On the other hand, referring to
In addition, the collection and exhaust chamber 1 includes a cylinder body 110 with several vertically communicated and mutually isolated cylinder chambers, a bottom shell 112 and a valve plate 114 respectively sealed and connected to bottom and top ends of the cylinder body 110, and a top cover 116 sealed and connected to a top end of the valve plate 114. The intake nozzle 10 and the inlet hole 70 are both defined in the bottom shell 112, and the vacuum breaking assembly 7 is assembled inside the bottom shell 112. The output shaft of the driving motor extends into the bottom shell from the bottom surface of the bottom shell, and the intake nozzle is located on the top cover. The valve plate defines an airflow hole and an umbrella for flexibly covering an exhaust end of the airflow hole. The leather bowl assembly includes a swing frame with a plurality of piston rods and a plurality of interconnected leather bowls. The piston rods and the leather bowls are correspondingly extended in the cylinder chambers from the bottoms and tops of the cylinder chambers and interlocked in the cylinder chambers. The bottom end of the swing frame is provided on an eccentric shaft, and the bottom end of the eccentric shaft is fixed on the rotation member 74. The central axel of the eccentric shaft and the output shaft 50 are inclined to each other. Multiple parts located outside the cylinder chamber are clamped and fixed by the valve plate and the cylinder body.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the specific implementations described above, and the specific implementations described above are only schematic and not limiting. Under the enlightenment of this invention, many forms can be made without departing from the scope of this invention and the scope of protection of the claims, and these are all included in the scope of protection of this invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202311627073. 9 | Nov 2023 | CN | national |
| 202323414880.0 | Dec 2023 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2023/142053 | 12/26/2023 | WO |
