The present disclosure relates to liquid pumps and, more particularly, to a liquid pump capable of achieving pressure equilibrium.
Liquid pumps are devices for moving a fluid. A conventional spring pump has an input pipe and an output pipe in communication with the input pipe. A non-return valve is disposed between the input pipe and the output pipe. The space within the spring pump is compressed with a piston therein to change the pressure within the space and thereby liquid is drawn out of a container through the input pipe and the output pipe. Afterward, the piston returns to its initial position by a spring. The aforesaid mechanical structure is unlikely to get damaged and is reusable for a long period of time.
However, in the course of drawing liquid out of a container and conveying the liquid with a liquid pump to another place, internal pressure of the container decreases gradually, rendering it increasingly difficult to operate the liquid pump. Furthermore, the amount of the liquid drawn in each instance of pumping is unstable. If a hole is formed on the container or a circulation route in order to supply external air to the container and thus maintain its internal pressure, the liquid is likely to leak through the hole to the detriment of external environment and user safety.
The objective of the present disclosure is to provide a liquid pump capable of achieving equilibrium between pressure inside and pressure outside a container, maintaining stable quantity of liquid output, and preventing leakage of liquid.
In order to achieve the above and other objectives, the present disclosure provides a liquid pump capable of achieving pressure equilibrium, comprising: a body having therein a main space, the main space having an input opening, an output opening and a piston opening; a piston member comprising a piston cylinder and a piston push rod, the piston cylinder having a piston space in communication with the main space through the piston opening, and the piston push rod being disposed in the piston space and sliding in an extension direction of the piston cylinder; a unidirectional input valve comprising an input plug and an input resilient element connected to the input plug, the input plug abutting against the input opening, and the input resilient element abutting against the body; a unidirectional output valve comprising an output plug and an output resilient element connected to the output plug, the output plug abutting against the output opening, and the output resilient element abutting against the body; an input inner pipe having an input channel with an end in communication with the input opening; a unidirectional gas-feeding hermetic seal valve fitting around the input inner pipe, wherein direction of gas flow between the unidirectional gas-feeding hermetic seal valve and the input inner pipe is opposite input direction of the input channel; and an input outer pipe containing the input inner pipe and the unidirectional gas-feeding hermetic seal valve and having an input portion and a gas-feeding portion surrounding the input portion, the input portion being in communication with another end of the input channel of the input inner pipe, wherein a gas-feeding channel is defined by and between the gas-feeding portion and the input inner pipe, the gas-feeding portion having a gas-feeding opening in communication with the gas-feeding channel and a gas-discharging opening, wherein the unidirectional gas-feeding hermetic seal valve is disposed between the gas-feeding opening and the gas-discharging opening.
In an embodiment of the present disclosure, the piston member further comprises a retract spring disposed between the piston cylinder and the piston push rod.
In an embodiment of the present disclosure, the piston member further comprises a piston hermetic seal ring fitting around the piston push rod.
In an embodiment of the present disclosure, the piston push rod has at least one engaging arm, and the piston cylinder has at least one engaging slot, with the engaging arm slidingly engaged with the engaging slot.
In an embodiment of the present disclosure, the input resilient element of the unidirectional input valve is configured in such a manner that compression direction is equivalent to an input direction of the input channel.
In an embodiment of the present disclosure, the body extends from the output opening to form an output tube, and the unidirectional output valve is disposed at an end of the output tube.
In an embodiment of the present disclosure, the output resilient element of the unidirectional output valve is configured in such a manner that compression direction is equivalent to an output direction of the output tube.
In an embodiment of the present disclosure, the liquid pump further comprises an atomization member disposed at the other end of the output tube.
In an embodiment of the present disclosure, the liquid pump further comprises an atomization cover and a cover hermetic seal ring, and the atomization cover has a hole corresponding in position to the atomization member, with the atomization cover disposed outside the output tube and the atomization member to fix the atomization member in place, and with the cover hermetic seal ring disposed between the atomization cover and the output tube.
In an embodiment of the present disclosure, the body further comprises a fitting upper cover and a fitting lower cover, wherein the main space is defined by and between the fitting upper cover and the fitting lower cover, the input opening being disposed at the fitting upper cover, and the output opening being disposed at the fitting lower cover.
In an embodiment of the present disclosure, the unidirectional input valve further comprises a support element disposed between the fitting upper cover and the fitting lower cover, and the input resilient element of the unidirectional input valve is disposed in the support element.
In an embodiment of the present disclosure, the liquid pump further comprises a hermetic seal ring fitting between the input inner pipe and the body.
In an embodiment of the present disclosure, the liquid pump further comprises a container mouth hermetic seal plug fitting around the input portion of the input outer pipe, and the gas-discharging opening is communicatively disposed between the container mouth hermetic seal plug and the input portion.
In an embodiment of the present disclosure, the body further comprises at least one pump proper fastener disposed on one side of the body.
Therefore, according to the present disclosure, the liquid pump capable of achieving pressure equilibrium has advantages as follows: the piston push rod is pushed and pulled under an applied force repeatedly to thereby continuously draw liquid out of the container through the body; the amount of liquid output in each instance of pumping is stable and fixed; and in the course of transferring the liquid, not only is the pressure inside and outside the container kept stable, but the container is also unlikely to deform or crack, not to mention that leakage of liquid is unlikely to occur, thereby ensuring user safety.
Objectives, features, and advantages of the present disclosure are hereunder illustrated with specific embodiments, depicted with drawings, and described below.
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The body 1 has therein a main space 11. The main space 11 has an input opening 12, an output opening 13 and a piston opening 14.
The piston member 2 comprises a piston cylinder 21 and a piston push rod 22. The piston cylinder 21 has a piston space 211 in communication with the main space 11 through the piston opening 14. The piston push rod 22 is disposed in the piston space 211 and slides along the extension direction of the piston cylinder 21.
The unidirectional input valve 3 is disposed in the main space 11. The unidirectional input valve 3 comprises an input plug 31 and an input resilient element 32 with one end connected to the input plug 31. The input plug 31 abuts against the input opening 12 from inside the main space 11. The input resilient element 32 is abuttingly disposed inside the body 1. In this embodiment, the input plug 31 is spherical, and the input resilient element 32 is a spring, but the present disclosure is not limited thereto.
The unidirectional output valve 4 is disposed outside the main space 11. The unidirectional output valve 4 comprises an output plug 41 and an output resilient element 42 with one end connected to the output plug 41. The output plug 41 abuts against the output opening 13 from outside the main space 11. The output resilient element 42 is abuttingly disposed inside the body 1. In this embodiment, the output plug 41 is spherical, and the output resilient element 42 is a spring, but the present disclosure is not limited thereto.
The input inner pipe 5 has an input channel 51. One end of the input channel 51 is in communication with the input opening 12.
The unidirectional gas-feeding hermetic seal valve 6 fits around the input inner pipe 5. Referring to
The input inner pipe 5 and the unidirectional gas-feeding hermetic seal valve 6 are disposed in the input outer pipe 7. The input outer pipe 7 has an input portion 71 and a gas-feeding portion 72 surrounding the input portion 71. The input portion 71 has therein a channel in communication with the other end of the input channel 51 of the input inner pipe 5. a gas-feeding channel 722 is defined by and between the gas-feeding portion 72 and the input inner pipe 5. The gas-feeding portion 72 has a gas-feeding opening 721 and a gas-discharging opening 723 in communication with the gas-feeding channel 722. The unidirectional gas-feeding hermetic seal valve 6 is disposed between the gas-feeding opening 721 and the gas-discharging opening 723.
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Since the liquid of the container C flows into the main space 11 through the input channel 51, external air enters the input outer pipe 7 through the gas-feeding opening 721 disposed on the gas-feeding portion 72 of the input outer pipe 7, and then the external air enters the container C through the unidirectional gas-feeding hermetic seal valve 6, the gas-feeding channel 722 defined by and between the gas-feeding portion 72 and the input inner pipe 5, and the gas-discharging opening 723 sequentially such that the internal pressure and external pressure of the container C are stable continuously. In this embodiment, the gas-discharging opening 723 is disposed between the input portion 71 and the gas-feeding portion 72 such that gas enters the container C after passing through the gas-discharging opening 723 and then flowing along a channel between the outer wall of the input portion 71 and the mouth of the container C.
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When the liquid pressure inside the main space 11 can no longer overcome the resilient restoring force of the output resilient element 42, the output plug 41 abuts against the output opening 13. At this point in time, the piston push rod 22 is pulled in the opposite direction, thereby supplying the liquid to the main space 11 and the piston space 211.
By pushing and pulling the piston push rod 22 repeatedly under an external force, the liquid of the container C can be continuously output through the body 1. In the course of outputting the liquid, not only do the internal pressure and external pressure of the container C remain stable to thereby preclude leakage of the liquid, but the amount of the liquid output in each instance is also stable and fixed.
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While the present disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the present disclosure set forth in the claims.
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Number | Date | Country | |
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20200332657 A1 | Oct 2020 | US |