1. Field of the Invention
The present invention relates to a handheld vacuum suction device, and in particular, to a handheld vacuum suction device that has a suction nozzle for making an inflow of moisture into a vacuum pump be minimized, and is capable of improving durability of a pressure switch for measuring a degree of vacuum, and simplifying the internal configuration by using a diaphragm-type vacuum pump.
2. Description of the Related Art
If foods, such as fruits, vegetables, meats, and dishes, are not stored airtight, they may be spoiled or go bad quickly due to oxygen in the air. Accordingly, a vacuum container that maintains a vacuum state therein by exhausting internal air to the outside is used.
The vacuum container may include an exhaust unit for exhausting internal air to the outside, but it usually includes, at one end thereof, a check valve for exhausting internal air to the outside, and exhausts internal air to the outside by using an additional vacuum suction device. FIG. 1 is a perspective view of a vacuum container and a vacuum suction device according to the related art.
FIG. 1 shows a vacuum container and a vacuum suction device described in U.S. Pat. No. 5,195,427. A vacuum container 1 includes a check valve 3. A vacuum suction device 5 exhausts air in the vacuum container 1 to the outside by using an internal vacuum pump while coming into close contact with the check valve 3 of the vacuum container 1. The vacuum suction device 5 has an actuating button 7. The vacuum suction device 5 may further include a display unit 9, such as an LED, for showing the actuation state.
The vacuum suction device 5 is provided at the tail end of a suction nozzle, which is attached to the check valve 3 to suck in air. Inside the vacuum suction device 5, the vacuum pump for forming the vacuum state and a circuit for controlling the actuation thereof is provided.
Meanwhile, while the vacuum suction device 5 sucks in air from the vacuum container, moisture may be exhausted together with air. It is not desirable that moisture is transferred to the vacuum pump. In the known vacuum suction device, there is not suggested a unit for effectively preventing moisture from being transferred to the vacuum pump.
Furthermore, the known vacuum suction device drives a piston by means of a crown gear and a connecting rod, but it is not effective in view of noise or durability. In addition, a compact vacuum pump may not be realized. Furthermore, in the known vacuum suction device, it is not easy to preserve the vacuum suction device after being used.
The invention has been finalized in order to solve the above-described problems, and it is an object of the invention to provide a handheld vacuum suction device that has a suction nozzle for making an inflow of moisture into a vacuum pump be minimized, and is capable of improving durability of a pressure switch for measuring a degree of vacuum, and simplifying the internal configuration by using a diaphragm-type vacuum pump.
It is another object of the invention to provide a handheld vacuum suction device that has a stand capable of conveniently placing a vacuum suction device thereon.
According to an aspect of the invention, a handheld vacuum suction device includes: an exterior case; a cap that includes a suction nozzle having a suction port at its lower portion and a side exhaust hole communicating with the suction port formed in its side surface, and is detachably mounted at a lower end of the exterior case; a pressure switch unit that is provided in the exterior case, and includes a pressure switch having a slide body configured to descend against an elastic force of a spring when a pressure in the cap falls below a predetermined pressure, to thereby cut off power supply, and a vertical through suction duct; a vacuum pump that includes an inlet port connected to the suction duct and sucks in air in a diaphragm manner; and a control unit that includes an actuating switch, and is electrically connected to the vacuum pump and the pressure switch to control the actuation of the vacuum pump.
The pressure switch of the pressure switch unit may include: a conductive contact panel that forms contacts with a pair of terminals; the slide body, to which the contact panel is fixedly mounted; a cover that is provided at a lower portion of the slide body; and the spring that is provided between the slide body and the cover to elastically support the slide body. In this case, when vacuum is completed, the slide body may descend such that the contact panel is separated from the terminals.
The vacuum pump may include: a motor; a fixture that has a slant pin configured to be placed apart at a predetermined distance from a rotation center at its upper portion and to slant toward the rotation center, and is coupled to a driving shaft of the motor; a rolling plate that is coupled to the slant pin to eccentrically shake in a vertical direction; and a diaphragm unit that has at least two diaphragms whose volume is changed according to the actuation of the rolling plate. In this case, intake and exhaust operations may be repeatedly performed according to the change in the volume of the diaphragms.
The handheld vacuum suction device according to the aspect of the invention may further include a stand that has a stand main body and a crater-shaped standing portion at an upper portion of the stand main body, the cap being inserted into the standing portion.
FIG. 1 is a perspective view of a vacuum container and a vacuum suction device according to the related art;
FIG. 2 is a perspective view of a vacuum suction device according to an exemplary embodiment of the invention;
