CN114576151A

CN114576151A - Liquid pumping protection method and air pump liquid pumping protection device using same

Info

Publication number: CN114576151A
Application number: CN202210168078.9A
Authority: CN
Inventors: 魏合语
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-06-03

Abstract

The invention provides a liquid pumping protection method, which belongs to the technical field of vacuum packaging equipment and comprises the following steps: s1, driving gas to be pumped into a first-stage liquid deposition cavity by using power of an air pump, wherein liquid possibly existing in the first-stage liquid deposition cavity is deposited at the bottom of the first-stage liquid deposition cavity; s2, the air pump power drives the gas and/or liquid in the first-stage liquid deposition cavity to enter a gas-liquid mixing structure, and if liquid exists in the extracted gas, bubbles are formed at the gas-liquid mixing structure; s3, detecting sound and/or pressure in the gas circuit in real time during operation of the gas pump, and recognizing that liquid exists in the gas circuit when detecting information of bubble characteristics, so as to perform protection action. The method avoids detection failure caused by the fact that the juice covers the electrodes or pollutes gas channels in an electrode detection method and a photoelectric detection method, and is high in reliability and timely in protection.

Description

Liquid pumping protection method and air pump liquid pumping protection device using same

Technical Field

The invention belongs to the technical field of vacuum packaging equipment, and particularly relates to a liquid pumping protection method and a liquid pumping protection device of an air pump using the same.

Background

Air extraction devices for household vacuum packaging are divided into two main categories, one is a handheld machine and the other is a desktop machine.

The hand-held machine is butted with an air outlet of a vacuum container (hereinafter referred to as a container) to be pumped through a soft rubber suction nozzle, air in the container is pumped out through an air pump arranged in the hand-held machine, and negative pressure is produced in the container. The air outlet of the container is provided with a one-way valve which only allows air to be discharged from the container, but prevents external air from entering the container. After the extraction is finished, the handheld machine is separated from the container, and the vacuum degree in the container is kept by the one-way valve.

The desktop machines typically have a sealing function for drawing a vacuum on the bag container. The air in the container is pumped out by an air pump arranged in the desktop computer, negative pressure is produced in the container, and the container is separated from the desktop computer after sealing.

When the vacuum is extracted from food and other articles, the situation that juice exists in the food and the like is inevitable, and liquid is extracted into the air extractor in the extraction process. Because parameters such as specific gravity, viscosity and the like of gas and liquid are greatly different, the air pump and the liquid pump are also greatly different in structural design, when liquid enters the air pump, the air pump is overloaded, if the liquid enters the air pump, the air pump is unsmooth in operation or overload protection is triggered, and if the liquid enters the air pump, the air pump is damaged.

In the traditional technology, the detection of liquid in the gas path is carried out without a non-electrode detection method, a photoelectric detection method and the like. Wherein:

1) the electrode detection method needs to arrange electrodes in a gas path in a sealing mode, and detects the existence of liquid by relying on the conductivity of the liquid. However, the juice in the food is often very viscous, so that the electrodes are very easy to cover and stick, so that the electrodes have conductivity for a long time (the electrodes can be identified as having liquid), or the electrodes lose the detection capability of newly-entered liquid (the electrodes can not be identified as having liquid) after being covered;

2) the photoelectric detection method is generally used for a light-transmitting air channel. If juice exists in food, the transparent gas path channel can be polluted, so that the light transmission is lost, and the detection fails.

To sum up, the identification of the extracted fluid by the air extractor for household vacuum packaging becomes a technical difficulty difficult to break through in the industry, influences the development of the industry, and brings some poor use experience for users.

Disclosure of Invention

In view of the above-mentioned deficiencies of the prior art, an embodiment of the present invention provides a method for protecting liquid from being drawn and a device for protecting liquid from being drawn by an air pump using the method.

In order to solve the technical problems, the invention provides the following technical scheme:

a method for protecting liquid extraction comprises the following steps:

s1, air pump power drives the gas to be pumped into the first-stage liquid deposition cavity, wherein the liquid possibly existing is deposited at the bottom of the first-stage liquid deposition cavity;

s2, driving the gas and/or liquid in the first-stage liquid deposition cavity into a gas-liquid mixing structure by the power of the air pump, and forming bubbles at the gas-liquid mixing structure if the liquid exists in the extracted gas;

and S3, detecting the sound and/or pressure in the air path in real time during the operation of the air pump, and when the information of the bubble characteristics is detected, recognizing that the air path has liquid, and performing a protection action.

The utility model provides an air pump protection device that draws liquid, includes at least one stage of liquid sedimentation chamber, at least one gas-liquid mixture structure and a bubble recognition device, wherein the end of gas-liquid mixture structure is visited in first stage of liquid sedimentation chamber.

As a further improvement scheme of the invention: the device comprises a soft suction nozzle, a first-stage liquid deposition cavity, a second-stage liquid deposition cavity, a gas-liquid mixing structure, a connection disc and a bubble identification device.

The soft suction nozzle is hermetically connected to the first-stage liquid deposition cavity;

the first-stage liquid deposition cavity is hermetically fixed on the second-stage liquid deposition cavity and is connected with the second-stage liquid deposition cavity through a through hole;

the second-stage liquid deposition cavity is hermetically fixed on a connection disc, and the connection disc is in gas circuit connection with the gas pump and the bubble identification device;

the gas-liquid mixing structure is a tubular structure, the upper end of the gas-liquid mixing structure is fixed on a lower partition wall of the second-stage liquid deposition cavity, the lower end of the gas-liquid mixing structure is provided with an inclined-plane opening and is suspended above the lower partition wall of the first-stage liquid deposition cavity, and the hollow space of the gas-liquid mixing structure is used as the only communicating gas path between the first-stage liquid deposition cavity and the second-stage liquid deposition cavity.

As a further improvement of the invention: the tail end of the gas-liquid mixing structure is suspended at the bottom of the first liquid deposition cavity, the tail end of the gas-liquid mixing structure is open and used for extracting liquid deposited at the bottom of the first liquid deposition cavity, and the side wall of the tail end of the gas-liquid mixing structure is provided with an air inlet hole which is used for providing an air supply channel for the gas-liquid mixing structure, so that air bubbles are formed at the gas-liquid mixing structure.

As a further improvement of the invention: and splash guards are arranged above the air inlet of the first-stage liquid deposition cavity and used for preventing liquid in the air flow from directly splashing into the next-stage air path.

As a still further improvement of the invention: the air inlet of the first-stage liquid deposition cavity, the air inlet of the first-stage liquid deposition cavity and the air inlet opening on the connection disc are not opposite in position and used for preventing liquid in the air flow from directly splashing into the next-stage air path.

As a still further improvement of the invention: the first-stage liquid deposition cavity and the second-stage liquid deposition cavity are fixed in a threaded mode, and a sealing ring is arranged between the first-stage liquid deposition cavity and the second-stage liquid deposition cavity.

As a still further improvement scheme of the invention: the sensitive part of the bubble identification device is an audio sensor and/or a pressure sensor, and the sensitive part is communicated with the air path of the air pump liquid pumping protection device.

As a still further improvement of the invention: comprises an upper sealing plate, a liquid collecting box and a bubble identification device,

the liquid collecting box consists of a first-stage liquid deposition cavity, a second-stage liquid deposition cavity, a gas-liquid mixing hole, a liquid blocking pipe and a sealing cover;

and the air passage of the bubble identification device is communicated with the second-stage liquid deposition cavity.

As a still further improvement of the invention: the liquid collecting box is detachable, an accommodating cavity which is butted with the liquid collecting box is arranged in the liquid collecting box,

the lower part of the liquid collecting box is provided with an air path butt joint port, and the accommodating cavity is internally provided with an air path butt joint nozzle and a butt joint sealing piece.

Compared with the prior art, the invention has the beneficial effects that:

in the embodiment of the invention, when liquid exists in the gas circuit, the liquid can be reliably identified, and the identification is completed before the liquid is pumped into the gas pump, and meanwhile, the protection is performed. The method avoids detection failure caused by the fact that the juice covers the electrodes or pollutes gas channels in an electrode detection method and a photoelectric detection method, and is high in reliability and timely in protection.

Drawings

FIG. 1 is a block flow diagram of a method for protecting an extraction fluid according to the present invention;

FIG. 2 is a schematic view of the liquid pumping protection device of the air pump of the present invention;

FIG. 3 is a schematic structural view of a splash guard built in a first-stage liquid deposition chamber according to the present invention;

FIG. 4 is a schematic structural diagram of the present invention showing an inverse slope type preventing liquid from directly entering the next stage of gas path;

FIG. 5 is a schematic view of a gas-liquid mixing structure according to the present invention;

FIG. 6 is a schematic diagram of the connection between the structure of the bubble identification device and the fluid-pumping protection device according to the present invention;

fig. 7 is a schematic view of the present invention for a table type vacuum packing machine.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Example one

Referring to fig. 1, the liquid pumping protection method disclosed by the present invention is used for a liquid pumping protection device, and includes the following steps:

s1, driving the gas and/or liquid to be pumped into the first-stage liquid deposition cavity by the air pump power, wherein the liquid possibly existing is deposited at the bottom of the first-stage liquid deposition cavity;

and S3, detecting the sound or pressure in the air path in real time during the operation of the air pump, and when the information of the bubble characteristics is detected, recognizing that the liquid exists in the air path, and performing a protection action.

The liquid pumping protection device is provided with two stages of liquid deposition cavities, a gas-liquid mixing structure and a bubble recognition device.

In the method, 1) the liquid deposition cavity is arranged, so that liquid possibly existing in the gas path is firstly collected into the liquid deposition cavity and does not directly enter the air pump, and the liquid can be prevented from entering the air pump before the liquid pumping protection action is executed, so that the air pump is protected; 2) the gas-liquid mixing structure is arranged, so that liquid possibly existing in the gas path is deposited and synthesized into bubbles with gas, the bubbles are expressed as bubble characteristics on the pressure and/or sound of the gas path, and the identifiable characteristics are provided for the bubble identification device.

After the method is used, when liquid exists in the gas circuit, the liquid can be reliably identified, and the identification is completed before the liquid is pumped into the gas pump, and meanwhile, protection is performed. The method avoids detection failure caused by the fact that the juice covers the electrodes or pollutes gas channels in an electrode detection method and a photoelectric detection method, and is high in reliability and timely in protection.

The core idea of the method is as follows:

1) at least one stage of liquid buffer container (liquid deposition cavity) is arranged in the gas path, and liquid possibly stored in the deposition gas path is prevented from directly entering the gas pump;

2) the tail end of the gas-liquid mixing structure is inserted into the bottom of the first-stage liquid buffer container, once liquid exists in the gas path, bubbles are formed in the gas-liquid mixing structure, and during the extraction process, the bubbles in the gas path generate obvious noise and pressure fluctuation in the gas path;

3) the bubble recognition device and the air pump work synchronously, information in the air circuit is recognized in real time, and after the information of bubble characteristics in the air circuit is recognized, protection action is made as required.

Example two

Referring to fig. 2, in the present embodiment, the liquid pumping protection device includes a flexible suction nozzle 1, a first-stage liquid deposition chamber 2, a second-stage liquid deposition chamber 3, a gas-liquid mixing structure 4, a connection tray 5, and a bubble identification device (not shown). Wherein the content of the first and second substances,

the soft suction nozzle 1 is made of flexible rubber, one end of the soft suction nozzle is provided with a connection port 11 which is tightly connected with the first-stage liquid deposition cavity 2, and the other end of the soft suction nozzle is provided with a suction lip 12 which is connected with a container to be extracted.

One end of the first-stage liquid deposition cavity 2 is in tight butt joint with the soft suction nozzle 1, and the other end is in butt joint with the second liquid deposition cavity 3. Wherein, one end of the soft suction nozzle 1 which is tightly butted with the soft suction nozzle is provided with a connection kiss 21 which is connected with the connection port 11 of the soft suction nozzle 1, the shape and the size of the connection kiss with the connection port 11 of the soft suction nozzle 1, the connection kiss and the soft suction nozzle are in interference fit to realize the sealing assembly between the connection port and the soft suction nozzle, so that the gas/liquid from the container to be extracted enters the first-stage liquid deposition cavity 2 in a sealing way through a through hole 22 on a lower partition wall 25 of the first-stage liquid deposition cavity 2. The end of the first-stage liquid deposition cavity 2, which is butted with the second liquid deposition cavity 3, is provided with an external thread 24 which can be screwed on the second liquid deposition cavity 3.

One end of the second liquid deposition cavity 3 is in threaded connection with the first-stage liquid deposition cavity 2, and the other end of the second liquid deposition cavity is in sealed butt joint with the connection disc 5. Wherein, the one end of spiro union with first order liquid sedimentation chamber 2 is equipped with internal thread 32 to be equipped with sealing washer 31 at the internal thread terminal, ensure second liquid sedimentation chamber 3 and the sealed butt joint of first order liquid sedimentation chamber 2. The second liquid deposition cavity 3 is provided with a second liquid deposition cavity lower partition wall 35 which separates the first-stage deposition cavity 2 from the second-stage deposition cavity 3. One end of the second liquid deposition cavity 3, which is in sealed butt joint with the connection disc 5, is a straight cylinder-shaped butt joint cylinder 36, and a fixed screw joint column 33 is arranged on the upper surface of a lower partition wall 35 of the second liquid deposition cavity and used for fixing the connection disc 5 together.

The gas-liquid mixing structure 4 is arranged on the second liquid deposition cavity lower partition wall 35, the gas-liquid mixing structure 4 is a pipeline tightly connected with the second liquid deposition cavity lower partition wall 35, the upper end of the gas-liquid mixing structure 4 is opened on the upper surface of the second liquid deposition cavity lower partition wall 35, and the lower end of the gas-liquid mixing structure 4 is a slope opening 41.

One end of the connection disc 5 is hermetically connected with the second liquid deposition cavity 3, and the other end is connected with an air pump (not shown), an air bubble recognition device (not shown) and the like. Wherein, one end connected with the second liquid deposition cavity 3 is a cylindrical butt joint 51, the outer diameter of which is slightly smaller than the inner diameter of the straight cylindrical butt joint cylinder 36 of the second-stage deposition cavity 3, and a sealing ring groove is arranged on the outer side of the cylindrical butt joint cylinder, and a sealing ring 52 is tightly embedded into the sealing ring groove. The connection disc 5 is provided with a butt screw hole 53, an air pump butt nozzle 54, an air bubble identification device butt nozzle 56 and the like at one end connected with the air pump, the air bubble identification device and the like.

During assembly, the soft suction nozzle 1 is embedded on the connection kiss 21 of the first-stage liquid deposition cavity 2; the first-stage liquid deposition cavity 2 is connected to the second-stage liquid deposition cavity 3 in a rotating mode; the cylindrical butt joint 51 of the connection disc 5 and the sealing ring 52 embedded in the outer side of the connection disc are inserted into the straight cylindrical butt joint barrel 36 of the second-stage liquid deposition cavity 3, and then the connection disc 5 and the second-stage liquid deposition cavity 3 are fixed together by using a screw 55, and the sealing between the two is realized by the sealing ring 52.

After the assembly is completed, 2 cavities are formed in the whole device, wherein one cavity is a first-stage liquid deposition cavity 2 positioned below, and the other cavity is a second liquid deposition cavity 3 positioned above. Wherein, the upper end of the first-stage liquid deposition cavity 2 is communicated with the second liquid deposition cavity 3 through a hole in the middle of the gas-liquid mixing structure 4, and the lower end is communicated with the suction lip of the soft suction nozzle 1 through a through hole 22; the upper end of the second liquid deposition chamber 3 is communicated with the air pump butt joint nozzle 54 and the bubble identification device butt joint nozzle 56.

The bubble identification device docking nozzle 56 is a port only, and provides air pressure or sound information of the liquid deposition chamber to the bubble identification device (not shown), and no fluid flow occurs at the port.

During operation, on the mouth is refuted to treating the extraction container to the lip 12 butt joint of inhaling of soft suction nozzle 1, air pump start-up work, treat that the gas in the extraction container is taken out under air pump power and treat the extraction container, its gas circuit route is: the container connection port → the suction lip 12 → the through hole 22 → the first-stage liquid deposition chamber 2 → the gas-liquid mixing structure 4 → the second-stage liquid deposition chamber 3 → the air pump connection nozzle 54 → the air pump → outside the air pump.

If the container to be extracted contains liquid and enters the air passage during extraction, the liquid firstly enters the first-stage liquid deposition cavity 2 through the container connecting port → the suction lip 12 → the through hole 22, because the specific gravity of the liquid is higher than that of the gas under normal conditions, the liquid is mostly deposited at the bottom of the first-stage liquid deposition cavity 2, the liquid level gradually rises along with the increase of the liquid, and a part of the inclined plane opening 41 at the lower end of the gas-liquid mixing structure 4 is submerged below the liquid level and a part of the inclined plane opening is above the liquid level. Under the power of the air pump, the air flow drives the liquid to flow to the second-stage liquid deposition cavity 3 along the gas-liquid mixing structure 4, namely, in the gas-liquid mixing structure 4, a state that gas and liquid are mixed occurs, and the gas enters the second-stage liquid deposition cavity 3 in a bubble mode. The result of this is: the bubble identification device may detect a continuous bubble popping sound, and/or a pressure fluctuation characteristic of a bubble, at the nipple 56.

The bubble identification device is a part of circuit electrically connected with a control circuit (not shown), when the control circuit drives the air pump to start extraction, the bubble identification device detects pressure and/or sound information at the butt joint nozzle 56 of the bubble identification device in real time, if bubble characteristics are detected, liquid is identified to be in the air path, and liquid extraction protection actions are made, including but not limited to stopping extraction, decelerating extraction, making acousto-optic prompts and the like, so as to prevent or reduce liquid from entering the air pump, cause air pump loss, or pollute the air path in the air pump.

For guaranteeing that the liquid in the gas circuit flows this device as far as possible after the drawing liquid protection, in this application, at the lower next door of first order liquid sedimentation chamber 2 and second level liquid sedimentation chamber 3, be equipped with one-level slope 23 and second grade slope 34 respectively, and the decurrent through-hole of gas circuit all establishes the lowest on slope, can guarantee that liquid is as far as possible to the through-hole deposit. After the liquid pumping protection, liquid can flow out of the first-stage liquid deposition cavity 2 and the second-stage liquid deposition cavity 3 as much as possible, so that the problems that the liquid is remained in the device for a long time, the gas circuit is blocked, the sanitary condition is caused and the like are avoided.

In this embodiment, two liquid deposition chambers are provided, bubbles are generated in the first liquid deposition chamber 2 and are exploded in the second liquid deposition chamber 3, and under the condition that the pumping protection action is sensitive (timely protection), less liquid enters the second liquid deposition chamber 3, and most of the liquid entering the gas path is concentrated in the first liquid deposition chamber 2. In the embodiment, the first-stage liquid deposition chamber 2 and the second-stage liquid deposition chamber 3 are screwed through threads, and a user can freely disassemble and assemble the liquid deposition chambers. After the liquid pumping protection action is taken place, the first-stage liquid deposition cavity 2 can be disassembled by a user, and the assembly is recovered after the first-stage liquid deposition cavity is flushed, namely, a convenient cleaning mode is provided for the device.

EXAMPLE III

When the device works, the air flow flows upwards from the through hole 22, the inclined plane opening 41 at the lower end of the gas-liquid mixing structure 4 is arranged above the through hole, when liquid is mixed in the air path, the liquid directly splashes into the gas-liquid mixing structure 4 along with the air flow, so that the liquid directly enters the second-stage liquid deposition cavity 3, the effect of forming bubbles at the gas-liquid mixing structure 4 is weakened, and the liquid pumping protection effect of the device is deteriorated. Thus, in another embodiment, in order to prevent the liquid entering the gas path from directly splashing into the gas path of the next stage, a splash guard is additionally provided directly above the through hole 22 on the lower partition wall 25 of the first-stage liquid deposition chamber 2 and/or directly above the gas-liquid mixing structure 4.

Fig. 3 is a schematic view showing the arrangement of a splash guard in the first-stage liquid deposition chamber 2, and the arrangement of the splash guard in the second-stage liquid deposition chamber 3 can be referred to fig. 3.

The first splash guard 6 arranged in the first-stage liquid deposition chamber 2 is mushroom-shaped and is arranged above the through hole 22 on the lower partition wall 25 of the first-stage liquid deposition chamber 2, and the lower edge of the first splash guard 6 is provided with at least one notch 61. In operation, the gas path from the through hole 22 and the liquid possibly entrained therein fall back onto the lower partition wall 25 of the first-stage liquid deposition chamber 2 under reflection from the mushroom-shaped first splash guard 6, and as the liquid density therein is generally greater than that of the gas, a liquid layer is formed at the bottom of the first-stage liquid deposition chamber 2 as the gas flow with entrained liquid continues to flow from the through hole 22 into the first-stage liquid deposition chamber 2, and the liquid level continues to rise until it partially falls over the beveled opening 41 at the lower end of the gas-liquid mixing structure 4, so that bubbles are formed well.

Example four

As a further example, fig. 4 illustrates a modified solution for preventing liquid in the gas path from directly splashing into the gas path of the next stage. For illustration, fig. 4 only shows the gas circuit improvement implemented in the first-stage liquid deposition chamber 2, and the gas circuit improvement implemented in the second-stage liquid deposition chamber 3, which can be implemented with reference to the guiding idea of fig. 4. In this embodiment, the upper end of the through hole 22 is provided with the vent pipe 26 having the inclined surface 27, the upper end of the through hole 22 is staggered with respect to the gas-liquid mixing structure 4, and the inclined surface 27 of the upper end of the vent pipe 26 is opposite to the inclined surface opening 41 of the lower end of the gas-liquid mixing structure 4, so as to prevent the gas flow from the through hole 22 and the liquid possibly existing therein from directly filling the gas-liquid mixing structure 4, thereby better forming bubbles.

EXAMPLE five

As a further example, fig. 5 illustrates a modification of the gas-liquid mixing structure 4. In this embodiment, as in other embodiments, the end of the gas-liquid mixing structure 4 extends into the bottom of the first liquid deposition chamber 2, wherein the end of the gas-liquid mixing structure 4 is provided with an opening 42 for extracting the liquid (if any) deposited at the bottom of the first liquid deposition chamber 2; and an air inlet hole 43 is formed on the side wall of the gas-liquid mixing structure 4 near the tail end.

During operation, under the pumping force of the air pump, air and liquid possibly existing in the air path firstly enter the first liquid deposition cavity 2, wherein the liquid possibly existing is deposited at the bottom of the first liquid deposition cavity 2, and when the liquid level is over the opening 42 at the tail end of the gas-liquid mixing structure 4, the liquid is pumped into the gas-liquid mixing structure 4; meanwhile, the liquid in the first liquid deposition chamber 2 is also drawn into the first liquid deposition chamber 2 through the gas inlet hole 43 on the gas-liquid mixing structure 4, and is mixed with the liquid therein to form bubbles.

EXAMPLE six

As a further example, FIG. 6 illustrates the structure of the bubble identification means and its connection to the withdrawal prevention means. In the present embodiment, the bubble identification device 7 is provided with a housing 71, an air passage pair port 72, a built-in sensor 73, a circuit lead-out terminal 74, and the like.

In assembling, the air passage interface 72 of the bubble identification device 7 and the liquid suction protection device are connected by the pipeline 75

EXAMPLE seven

Referring to fig. 7, the liquid-extracting protection device 8, which is suitable for a table type vacuum packaging machine (for extracting vacuum from a bag container), includes a base 81, a detachable liquid collection box 82, an upper sealing plate 83, a sealing plug 84, a butt sealing member 85, a gas-liquid mixing hole 86, and a necessary bubble recognition device (not shown). Wherein:

the pedestal 81 is provided with an accommodating cavity 811 for butting the liquid collecting box, an air path butting nozzle 812, an air path external nozzle 813 and the like, and the air path butting nozzle 812 is communicated with the air hole 814 inside the air path external nozzle 813.

The liquid collection cassette 82 includes a first stage liquid deposition chamber 821, a second stage liquid deposition chamber 822, a ledge 823, a sealing engagement opening 824, a liquid flow-merging region 825, a deposition chamber partition 826, a second stage liquid deposition chamber sealing opening 827, a gas conduit 828, a gas circuit interface seat 829, and the like.

The liquid collection box 82 can be easily detached from the stand 81 to pour out the liquid collected therein and to clean it.

A table vacuum packaging machine is used to draw a vacuum on the bag-type container and upper sealing plate 83 is an elastomeric seal that snaps over first-stage liquid deposition chamber 821. During operation, one end of the opening of the bag-type container is lapped on the upper opening of the first-stage liquid deposition cavity 821, the upper sealing plate 83 is buckled on the sealing fit opening 824, and the one end of the opening of the bag-type container is clamped between the sealing fit opening 824 and the upper sealing plate 83, so that the first-stage liquid deposition cavity 821 and the one end of the opening of the bag-type container are in sealing butt joint.

The liquid confluence area 825 is a partial area of the bottom of the first-stage liquid deposition chamber 821, which is sunk, near the gas-liquid mixing hole 86, for the liquid deposited in the first-stage liquid deposition chamber 821 to first confluence to form a bubble at the gas-liquid mixing hole 86 as soon as possible.

The deposition chamber partition 826 is a partition between the first-stage liquid deposition chamber 821 and the second-stage liquid deposition chamber 822. The gas-liquid mixing hole 86 is formed in the lower portion of the partition wall and is a passage for communicating the first-stage liquid deposition chamber 821 and the second-stage liquid deposition chamber 822.

A gas conduit 828 is arranged in the second-stage liquid deposition chamber 822, the gas conduit 828 is a gas guide tube fixed in the second-stage liquid deposition chamber 822 and is a communication channel between the second-stage liquid deposition chamber 822 and the gas pump, the upper end of the gas conduit is opened at the upper part of the second-stage liquid deposition chamber 822, and the lower end of the gas conduit is communicated with a gas path butt joint seat 829 positioned at the bottom of the second-stage liquid deposition chamber 822.

The sealing plug 84 is an elastic sealing element, and is tightly installed at the opening above the second-stage liquid deposition cavity 822, and is plugged during operation, when the inside of the second-stage liquid deposition cavity 822 needs to be cleaned, the sealing plug 84 is pulled out, and then the liquid in the inside of the second-stage liquid deposition cavity 822 can be poured out and cleaned.

The entire removable liquid collection cassette 82 can be easily removed from the stand 81 and connected to the stand via an air path. Wherein, the bottom of the accommodating cavity 811 of the pedestal 81 is provided with an air channel butt joint mouth 812, on which a butt joint sealing member 85 is sleeved; when the liquid collection box 82 is installed in the accommodation cavity 811 of the pedestal 81, the air path butt joint nozzle 812 is embedded in the air path butt joint seat 829 at the bottom of the liquid collection box 82, air path sealing is realized through the butt joint sealing member 85, and air path connection is completed between the second-stage liquid deposition cavity 822 and the air path external nozzle 813.

During operation, the detachable liquid collecting box 82 is arranged in the accommodating cavity 811 of the pedestal 81 to complete the air path communication between the second-stage liquid deposition cavity 822 and the air path external nozzle 813; a bag type container to be vacuumized is put on an upper opening of the first-stage liquid deposition cavity 821, the upper sealing plate 83 is buckled, and the first-stage liquid deposition cavity 821 is in sealed communication with the bag type container; when the air pump connected to the external air path nozzle 813 (not shown) is started, the air (including the liquid possibly existing) in the bag container flows to the air pump along the following air paths: bag container → first-stage liquid deposition chamber 821 → gas-liquid mixing hole 86 → second-stage liquid deposition chamber 822 → gas hole 814 → gas pump.

If the bag container contains a liquid and the amount of the liquid is sufficiently large, the liquid is first deposited in the first-stage liquid deposition chamber 821 and merged with the liquid merging region 825, and the liquid forms bubbles at the gas-liquid mixing hole 86 by the gas flow, and the sound/pressure characteristics caused by the bubbles are recognized by the bubble recognition device, whereby the control circuit initiates the protective action.

In the process, the liquid is first deposited in the first-stage liquid deposition chamber 821, during the bubble formation process, part of the liquid flows into the second-stage liquid deposition chamber 822, and since the gas conduit 828 opens above the second-stage liquid deposition chamber 822, the liquid in the second-stage liquid deposition chamber 822 cannot enter the gas conduit 828 before the control circuit starts the protection action, so that the liquid in the gas path is prevented from entering the gas pump.

After dispensing the pump protection, the user removes the fluid collection cassette 82, removes the sealing plug 84, pours the fluid from the first stage fluid deposition chamber 821 and the second stage fluid deposition chamber 822, and cleans the same.

In this embodiment, the gas-liquid mixing hole 86 serves as a passage for connecting the two-stage liquid deposition chambers, where gas-liquid mixing occurs to form bubbles, providing recognizable features for the control circuit, and completing liquid extraction recognition and protection.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. The liquid pumping protection method is characterized by comprising the following steps:

s1, driving the gas to be pumped into the first-stage liquid deposition cavity by the air pump power, wherein the liquid possibly existing is deposited at the bottom of the first-stage liquid deposition cavity;

and S3, detecting the sound and/or pressure in the air path in real time during the operation of the air pump, and making a protection action when detecting the information of the characteristics of the air bubbles, namely identifying that liquid exists in the air path.

2. The utility model provides an air pump protection device that draws liquid which characterized in that includes at least one stage of liquid sedimentation chamber, at least one gas-liquid mixture structure and a bubble recognition device, wherein the end of gas-liquid mixture structure is visited in first stage of liquid sedimentation chamber.

3. The air pump liquid extraction protection device of claim 2, comprising a soft suction nozzle, a first-stage liquid deposition chamber, a second-stage liquid deposition chamber, an air-liquid mixing structure, a docking tray and a bubble identification device.

the gas-liquid mixing structure is a tubular structure, the upper end of the gas-liquid mixing structure is fixed on the lower partition wall of the second-stage liquid deposition cavity, the lower end of the gas-liquid mixing structure is provided with an inclined opening and is suspended above the lower partition wall of the first-stage liquid deposition cavity, and the air of the gas-liquid mixing structure is used as the only communicating air path between the first-stage liquid deposition cavity and the second-stage liquid deposition cavity.

4. An air pump pumping protection device as claimed in claim 2, wherein the air-liquid mixing structure has a distal end suspended from the bottom of the first liquid deposition chamber and an open distal end for pumping the liquid deposited at the bottom of the first liquid deposition chamber, and an air inlet hole is formed in a side wall of the distal end for providing an air supply passage to the air-liquid mixing structure, thereby forming air bubbles at the air-liquid mixing structure.

5. An air pump liquid pumping protection device as claimed in claim 2, wherein splash guards are further provided above the air inlet of the first stage liquid deposition chamber and the air inlet of the first stage liquid deposition chamber for preventing the liquid in the air flow from directly splashing into the next stage air path.

6. The air pump pumping protection device of claim 2, wherein the air inlet of the first-stage liquid deposition chamber, the air inlet of the first-stage liquid deposition chamber and the air inlet opening of the connection tray are positioned in a non-facing manner to prevent the liquid in the air flow from directly splashing into the air path of the next stage.

7. The pumping protection device of an air pump according to claim 2, wherein the first-stage liquid deposition chamber and the second-stage liquid deposition chamber are fixed by screwing and a sealing ring is arranged between the first-stage liquid deposition chamber and the second-stage liquid deposition chamber.

8. An air pump pumping protection device according to claim 2, wherein the bubble identification device has a sensitive part which is an audio sensor and/or a pressure sensor, and the sensitive part is communicated with the air passage of the air pump pumping protection device.

9. The air pump pumping protection device of claim 2, comprising an upper sealing plate, a liquid collecting box and an air bubble identification device,

10. An air pump pumping protection device as claimed in claim 9, wherein the liquid collection box is removable, a containing cavity is disposed in the liquid collection box and is abutted against the liquid collection box,