Liquid extraction device for container

Abstract

The present invention discloses a liquid pumping device for a container, comprising a liquid pumping cylinder, wherein the inner side wall of the liquid pumping cylinder is sealedly connected with a movable plug which can slide relative to the liquid pumping cylinder, the inner cavity of the liquid pumping cylinder forms a liquid storage cavity, so a connecting hole sleeve is provided on the liquid pumping cylinder, a sealing sleeve is provided in the connecting hole sleeve, a liquid inlet and outlet pipe communicating with the liquid storage cavity is slidably connected in the sealing sleeve, a liquid inlet and outlet window which can communicate with the liquid storage cavity is provided on the side wall of the liquid inlet and outlet pipe, an air replenishing hole which communicates with the inner cavity of the liquid inlet and outlet pipe is provided on the movable plug, and an air replenishing control structure for controlling the opening or closing of the air replenishing hole so that the inner cavity of the liquid inlet and outlet pipe is connected with or isolated from the outside is also provided on the movable plug; therefore, the present invention can avoid liquid spilling out when the liquid inlet and outlet pipe is separated from the container, thereby causing waste, and can ensure that there is no residual liquid on the outer wall of the liquid inlet and outlet pipe, and has the characteristics of cleanliness, hygiene and convenient operation.

Description

[Technical field]

[0002] The invention relates to a liquid extraction device for a container. [Background technology]

[0004] Packaging containers involve all walks of life and are used to protect goods. They facilitate storage and use, facilitate transportation, promote sales, prevent environmental pollution and prevent safety accidents. Different industries and different products need to use corresponding packaging containers according to certain technical specifications.

[0005] In current life, when taking out a packaging container filled with liquid, a pumping device is usually used to take out the liquid. However, the existing pumping device is complicated to operate and difficult to use, and the liquid is not discharged smoothly, which makes it inconvenient to use.

[0006] In addition, when the existing liquid extraction device extracts liquid to the amount required, the liquid extraction device needs to be separated from the container for use; because liquid will remain in the inlet and outlet pipes of the liquid extraction device during the liquid extraction process, when the liquid extraction device is separated from the container, the liquid in the inlet and outlet pipes will spill to the outside, which is unhygienic.

[0007] Furthermore, during use of the liquid inlet and outlet pipe, liquid will remain on the outer wall thereof, which also causes unsanitary problems.

[0008] Therefore, the present invention is studied and proposed in view of the above problems. [Summary of the invention]

[0010] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a liquid pumping device for a container, which can improve the problems existing in the prior art. The liquid pumping device can prevent liquid from spilling out when the inlet and outlet liquid pipes are separated from the container, causing waste, and at the same time ensure that there is no residual liquid on the outer wall of the inlet and outlet liquid pipes. The device has the characteristics of cleanliness, hygiene and easy operation.

[0011] The present invention is achieved through the following technical solutions:

[0012] A liquid extraction device for a container comprises a liquid extraction cylinder 1, wherein the inner side wall of the liquid extraction cylinder 1 is sealedly connected to a movable plug 2 which can slide relative to the liquid extraction cylinder 1, and the inner cavity of the liquid extraction cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid extraction cylinder 1, and a sealing sleeve 121 is provided in the connecting hole sleeve 12, and a liquid inlet and outlet pipe 3 communicating with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, and a liquid inlet and outlet window 311 which can communicate with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, and an air replenishment hole 21 which communicates with the inner cavity of the liquid inlet and outlet pipe 3 is provided on the movable plug 2, and an air replenishment control structure for controlling the opening or closing of the air replenishment hole 21 so that the inner cavity of the liquid inlet and outlet pipe 3 is connected with or isolated from the outside is provided on the movable plug 2.

[0013] The liquid pumping device for a container as described above is characterized in that the air supply control structure is a one-way air inlet valve 22 provided on the movable plug 2 for controlling the opening or closing of the air supply hole 21.

[0014] The above-mentioned liquid extraction device for a container is characterized in that the sealing sleeve 121 is made of a deformable silicone material.

[0015] The above-mentioned liquid extraction device for a container is characterized in that a locking structure 4 is provided between the liquid inlet and outlet pipe 3 and the movable plug 2 so that when the movable plug 2 moves relative to the liquid extraction cylinder 1, the locking structure 4 can move together with the liquid inlet and outlet pipe 3 relative to the liquid extraction cylinder 1.

[0016] The above-mentioned liquid extraction device for a container is characterized in that the locking structure 4 includes a static locking block 41 arranged on the movable plug 2, and the liquid inlet and outlet pipes 3 are provided with a dynamic locking block 42 that can cooperate with the static locking block 41 for locking.

[0017] The above-mentioned liquid extraction device for a container is characterized in that the liquid inlet and outlet pipes 3 are provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the liquid inlet and outlet pipes 3 or the movable plug 2 from being separated from the upper end of the liquid extraction cylinder 1.

[0018] A liquid pumping device for a container as described above is characterized in that the liquid inlet and outlet pipe 3 includes an upper tube 31 slidably connected to the sealing sleeve 121 and a lower tube 33 movably and sealingly connected to the upper tube 31, and a first control structure 5 is provided between the lower tube 33 and the upper tube 31, which can control the connection or isolation between the inner cavity of the liquid inlet and outlet pipe 3 and the outside.

[0019] As described above, a liquid pumping device for a container is characterized in that the first control structure 5 includes a first static liquid outlet 51 arranged on the side wall of the upper tube 31, and the side wall of the lower tube 33 is provided with a first movable liquid outlet 52 which can be aligned or displaced with the first static liquid outlet 51 when the lower tube 33 moves relative to the upper tube 31.

[0020] The above-mentioned liquid pumping device for a container is characterized in that a limiting structure 6 is provided between the lower tube 33 and the upper tube 31, which can cooperate with the first control structure 5 to control the connection or isolation between the inner cavity of the inlet and outlet liquid tube 3 and the outside.

[0021] The above-mentioned liquid pumping device for a container is characterized in that the limiting structure 6 includes a limiting protrusion 61 arranged on the inner wall of the upper tube 31, and a limiting groove 62 that can cooperate with the limiting protrusion 61 for limiting is provided on the side wall of the lower tube 33.

[0022] The above-mentioned liquid extraction device for a container is characterized in that the upper tube 31 and the movable plug 2 are integrally formed.

[0023] A liquid pumping device for a container as described above is characterized in that the liquid inlet and outlet pipe 3 includes an upper tube 31 slidably connected to a sealing sleeve 121, a middle tube 32 is slidably and sealedly connected inside the upper tube 31, and the middle tube 32 is movably and sealedly connected to a lower tube 33, a limiting structure 7 is provided between the lower tube 33 and the upper tube 31, which can make the middle tube 32 retract or fix relative to the upper tube 31, and a second control structure 8 is provided between the lower tube 33 and the middle tube 32, which can control the connection or isolation between the inner cavity of the liquid inlet and outlet pipe 3 and the outside.

[0024] As described above, a liquid extraction device for a container is characterized in that the limiting structure 7 includes an upper limiting column 71 arranged in the upper tube 31, and a lower limiting column 72 is provided in the lower tube 33 so that it can be aligned or misaligned with the upper limiting column 71 when the lower tube 33 moves relative to the upper tube 31.

[0025] As described above, a liquid pumping device for a container is characterized in that the second control structure 8 includes a second static liquid outlet 81 arranged on the side wall of the middle tube 32, and the side wall of the lower tube 33 is provided with a second movable liquid outlet 82 which can be aligned or displaced with the second static liquid outlet 81 when the lower tube 33 moves relative to the upper tube 31.

[0026] A liquid pumping device for a container comprises a liquid pumping cylinder 1, wherein the inner side wall of the liquid pumping cylinder 1 is sealedly connected to a movable plug 2 which can slide relative to the liquid pumping cylinder 1, the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, a sealing sleeve 121 is provided in the connecting hole sleeve 12, an inlet and outlet pipe 3 which communicates with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, a side wall of the liquid inlet and outlet pipe 3 is provided with a liquid inlet and outlet window 311 which can communicate with the liquid storage cavity 11, a gas replenishing through hole 35 which is isolated from the outside during liquid pumping and can communicate with the outside when the liquid pumping is completed and the liquid inlet and outlet window 311 is blocked by the sealing sleeve 121 is provided on the side wall of the liquid inlet and outlet pipe 3 and located below the liquid inlet and outlet window 311, a locking structure 4 is provided between the liquid inlet and outlet pipe 3 and the movable plug 2, which can move relative to the liquid pumping cylinder 1 together with the liquid inlet and outlet pipe 3 when the movable plug 2 moves relative to the liquid pumping cylinder 1

[0027] The above-mentioned liquid extraction device for a container is characterized in that the locking structure 4 includes a static locking block 41 arranged on the movable plug 2, and the liquid inlet and outlet pipes 3 are provided with a dynamic locking block 42 that can cooperate with the static locking block 41 for locking.

[0028] The above-mentioned liquid extraction device for a container is characterized in that the liquid inlet and outlet pipes 3 are provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug 2 from being separated from the upper end of the liquid extraction cylinder 1.

[0029] The above-mentioned liquid extraction device for a container is characterized in that the sealing sleeve 121 is made of a deformable silicone material.

[0030] A liquid pumping device for a container comprises a liquid pumping cylinder 1, wherein the inner side wall of the liquid pumping cylinder 1 is sealedly connected to a movable plug 2 which can slide relative to the liquid pumping cylinder 1, the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, a sealing sleeve 121 is provided in the connecting hole sleeve 12, a liquid inlet and outlet pipe 3 which is in communication with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, a liquid inlet and outlet window 311 which can be in communication with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, an air replenishing through hole 35 which is isolated from the outside during liquid pumping and can be in communication with the outside after liquid pumping is completed is provided on the side wall of the liquid inlet and outlet pipe 3 and located below the liquid inlet and outlet window 311, a locking structure 4 which can move relative to the liquid pumping cylinder 1 together with the liquid inlet and outlet pipe 3 when the movable plug 2 moves relative to the liquid pumping cylinder 1 is provided.

[0031] The above-mentioned liquid extraction device for a container is characterized in that the locking structure 4 includes a static locking block 41 arranged on the movable plug 2, and the liquid inlet and outlet pipes 3 are provided with a dynamic locking block 42 that can cooperate with the static locking block 41 for locking.

[0032] The above-mentioned liquid extraction device for a container is characterized in that the liquid inlet and outlet pipes 3 are provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug 2 from being separated from the upper end of the liquid extraction cylinder 1.

[0033] The above-mentioned liquid extraction device for a container is characterized in that the sealing sleeve 121 is made of a deformable silicone material.

[0034] A liquid pumping device for a container as described above is characterized in that the liquid inlet and outlet pipe 3 includes an upper tube 31 slidably connected to the sealing sleeve 121 and a lower tube 33 movably and sealingly connected to the upper tube 31, and a first control structure 5 is provided between the lower tube 33 and the upper tube 31, which can control the connection or isolation between the inner cavity of the liquid inlet and outlet pipe 3 and the outside.

[0035] As described above, a liquid pumping device for a container is characterized in that the first control structure 5 includes a first static liquid outlet 51 arranged on the side wall of the upper tube 31, and the side wall of the lower tube 33 is provided with a first movable liquid outlet 52 which can be aligned or displaced with the first static liquid outlet 51 when the lower tube 33 moves relative to the upper tube 31.

[0036] A liquid pumping device for a container as described above is characterized in that the air replenishing hole 35 includes an upper through hole 351 arranged on the side wall of the upper tube 31, and the side wall of the lower tube 33 is provided with a lower through hole 352 which can be aligned or misaligned with the upper through hole 351 when the lower tube 33 moves relative to the upper tube 31 so that the inner cavity of the inlet and outlet liquid pipe 3 is connected or isolated from the outside.

[0037] A liquid pumping device for a container comprises a liquid pumping cylinder 1, wherein the inner side wall of the liquid pumping cylinder 1 is sealedly connected to a movable plug 2 which can slide relative to the liquid pumping cylinder 1, and the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, and a sealing sleeve 121 is provided in the connecting hole sleeve 12, and a liquid inlet and outlet pipe 3 which communicates with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, and a liquid inlet and outlet pipe 3 which communicates with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, and a liquid inlet and outlet window 311 which can communicate with the liquid storage cavity 11 is provided, and the liquid inlet and outlet pipe 3 and the movable plug 2 are an integrally formed structure.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] 1. The present invention comprises a liquid pumping cylinder, wherein the inner side wall of the liquid pumping cylinder is sealedly connected with a movable plug which can slide relative to the liquid pumping cylinder, the inner cavity of the liquid pumping cylinder forms a liquid storage cavity, so a connecting hole sleeve is provided on the liquid pumping cylinder, a sealing sleeve is provided in the connecting hole sleeve, an inlet and outlet pipe communicating with the liquid storage cavity is slidably connected in the sealing sleeve, a liquid inlet and outlet window which can communicate with the liquid storage cavity is provided on the side wall of the liquid inlet and outlet pipe, an air replenishing hole which communicates with the inner cavity of the liquid inlet and outlet pipe is provided on the movable plug, and an air replenishing control structure for controlling the opening or closing of the air replenishing hole so that the inner cavity of the liquid inlet and outlet pipe is connected with or isolated from the outside is provided on the movable plug; when pumping liquid, the lower end of the liquid inlet and outlet pipe is connected with the inner cavity of the container and the lower end of the liquid inlet and outlet pipe is against the mouth or outer wall of the container, and the liquid pumping cylinder is operated to move toward the container When the liquid in the liquid storage chamber reaches the required amount, the air replenishment control structure is operated to open the air replenishment hole to connect the outside with the inner cavity of the liquid inlet and outlet pipe. Under the action of the external atmospheric pressure, the residual liquid in the liquid inlet and outlet pipe flows back into the container. When all the liquid in the liquid inlet and outlet pipe flows back into the container, the liquid inlet and outlet pipe is completely separated from the container, which can avoid the liquid spilling out and causing waste when the liquid inlet and outlet pipe is separated from the container. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can ensure that there is no residual liquid on the outer wall of the liquid inlet and outlet pipe when in use, which has the characteristics of cleanliness and convenience in operation.

[0040] 2. The invention comprises a liquid pumping cylinder, wherein the inner wall of the liquid pumping cylinder is sealedly connected with a movable plug which can slide relative to the liquid pumping cylinder, and the inner cavity of the liquid pumping cylinder forms a liquid storage cavity, so a connecting hole sleeve is provided on the liquid pumping cylinder, a sealing sleeve is provided in the connecting hole sleeve, and an inlet and outlet pipe which is communicated with the liquid storage cavity is slidably connected in the sealing sleeve. The side wall of the liquid pumping cylinder is provided with an inlet and outlet window which can be communicated with the liquid storage cavity. The side wall of the liquid pumping cylinder is provided with an inlet and outlet window which can be communicated with the liquid storage cavity. An air-injection through hole which is isolated from the outside during liquid pumping and can be communicated with the outside when liquid pumping is completed and the inlet and outlet window is blocked by the sealing sleeve is provided on the side wall of the liquid pumping cylinder and located under the inlet and outlet window. The inlet and outlet pipe and the movable plug are provided with a locking structure which can move together with the inlet and outlet pipe relative to the liquid pumping cylinder when the movable plug moves relative to the liquid pumping cylinder; when pumping liquid, the lower end of the inlet and outlet pipe is communicated with the inner cavity of the container and the lower end of the inlet and outlet pipe abuts against the container mouth or outer wall, and the liquid pumping cylinder is operated to move toward one side of the container so that the inlet and outlet pipe can be moved. When the liquid in the liquid storage chamber reaches the required amount, the inlet and outlet pipes are operated to separate the inlet and outlet pipes from the movable plug, and then the liquid pumping cylinder is operated to separate the liquid pumping cylinder from the container. In this process, the inlet and outlet pipes slide relative to the liquid pumping cylinder. When the liquid pumping cylinder moves to the position where the sealing sleeve blocks the inlet and outlet windows, the air replenishing through hole is connected to the outside. Under the action of the external atmospheric pressure, the residual liquid in the inlet and outlet pipes flows back into the container. When the liquid in the inlet and outlet pipes all flows back into the container, the inlet and outlet pipes are completely separated from the container, which can avoid liquid spilling out when the inlet and outlet pipes are separated from the container, causing waste. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can be ensured that there is no residual liquid on the outer wall of the inlet and outlet pipes when in use, which has the characteristics of cleanliness and convenience in operation.

[0041] 3. The present invention includes a liquid pumping cylinder, wherein the inner side wall of the liquid pumping cylinder is sealedly connected with a movable plug that can slide relative to the liquid pumping cylinder, the inner cavity of the liquid pumping cylinder forms a liquid storage cavity, so a connecting hole sleeve is provided on the liquid pumping cylinder, a sealing sleeve is provided in the connecting hole sleeve, an inlet and outlet pipe communicating with the liquid storage cavity is slidably connected in the sealing sleeve, a liquid inlet and outlet window that can communicate with the liquid storage cavity is provided on the side wall of the liquid inlet and outlet pipe, an air-injection through hole that is isolated from the outside during liquid pumping and can be connected to the outside after liquid pumping is completed is provided on the side wall of the liquid inlet and outlet pipe and located below the liquid inlet and outlet window, a locking structure that can move relative to the liquid pumping cylinder together with the liquid inlet and outlet pipe when the movable plug moves relative to the liquid pumping cylinder; when pumping liquid, the lower end of the inlet and outlet pipe is aligned with the container The inner cavity is connected and the lower end of the inlet and outlet pipes is against the container mouth or outer wall. The liquid pump is operated to move toward one side of the container, and the liquid in the inner cavity of the container enters the liquid storage cavity from the inlet and outlet pipe and through the inlet and outlet window. When the liquid in the liquid storage cavity reaches the required amount, the inner cavity of the inlet and outlet pipe is connected with the outside through the air replenishing hole. Under the action of the external atmospheric pressure, the residual liquid in the inlet and outlet pipe flows back into the container. When the liquid in the inlet and outlet pipes all flows back into the container, the inlet and outlet pipes are completely separated from the container, which can avoid liquid spilling out when the inlet and outlet pipes are separated from the container, causing waste. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can be ensured that there is no residual liquid on the outer wall of the inlet and outlet pipe when in use, which has the characteristics of cleanliness and convenience in operation.

[0042] 4. The present invention includes a liquid pumping cylinder, the inner side wall of which is sealingly connected to a movable plug that can slide relative to the liquid pumping cylinder, the inner cavity of the liquid pumping cylinder forms a liquid storage cavity, so a connecting hole sleeve is provided on the liquid pumping cylinder, a sealing sleeve is provided in the connecting hole sleeve, a liquid inlet and outlet pipe communicating with the liquid storage cavity is slidably connected in the sealing sleeve, a liquid inlet and outlet window that can communicate with the liquid storage cavity is provided on the side wall of the liquid inlet and outlet pipe, and the liquid inlet and outlet pipe and the movable plug are in an integrally formed structure; the present invention can ensure that there is no residual liquid on the outer wall of the liquid inlet and outlet pipe when in use by providing a sealing sleeve in the connecting hole sleeve, and has the characteristics of cleanliness, hygiene and easy operation.

Brief Description of the Drawings

[0044] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0045] Figure 1 A cross-sectional view of a first embodiment of a scheme of the present invention;

[0046] Figure 2 A cross-sectional view of a second embodiment of a scheme of the present invention;

[0047] Figure 3 A cross-sectional view of a third embodiment of a scheme of the present invention;

[0048] Figure 4 A cross-sectional view of a fourth embodiment of a scheme of the present invention;

[0049] Figure 5 A cross-sectional view of a fifth embodiment of a scheme of the present invention;

[0050] Figure 6 A sectional view of a sixth embodiment of a scheme of the present invention;

[0051] Figure 7 A cross-sectional view of a specific embodiment of the second scheme of the present invention;

[0052] Figure 8 A cross-sectional view of a specific embodiment of scheme three of the present invention;

[0053] Fig. 9 It is a cross-sectional view of a specific embodiment of scheme 4 of the present invention. [Specific implementation method]

[0055] The following is combined with Figure 1-9 Embodiments of the present invention are described in detail.

[0056] Option 1:

[0057] like Figure 1-6 As shown, the present invention is a liquid pumping device for a container, comprising a liquid pumping cylinder 1, wherein the inner side wall of the liquid pumping cylinder 1 is sealingly connected to a movable plug 2 which can slide relative to the liquid pumping cylinder 1, and the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, and a sealing sleeve 121 is provided in the connecting hole sleeve 12, and a liquid inlet and outlet pipe 3 communicating with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, and a liquid inlet and outlet window 311 which can communicate with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, and an air replenishing hole 21 which communicates with the inner cavity of the liquid inlet and outlet pipe 3 is provided on the movable plug 2, and an air replenishing control structure for controlling the opening or closing of the air replenishing hole 21 so that the inner cavity of the liquid inlet and outlet pipe 3 is connected or isolated from the outside is provided on the movable plug 2. When the liquid in the liquid storage chamber reaches the required amount, the air replenishment control structure is operated to open the air replenishment hole to connect the outside with the inner cavity of the inlet and outlet pipe. Under the action of the external atmospheric pressure, the residual liquid in the inlet and outlet pipe flows back into the container. When the liquid in the inlet and outlet pipe all flows back into the container, the inlet and outlet pipe is completely separated from the container, which can avoid liquid spilling out when the inlet and outlet pipe is separated from the container, causing waste. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can ensure that there is no residual liquid on the outer wall of the inlet and outlet pipe, which has the characteristics of cleanliness and convenience in operation.

[0058] The first solution can also be operated to move the movable plug relative to the liquid pumping cylinder, thereby moving together with the liquid inlet and outlet pipes.

[0059] like Figure 1-6 As shown, according to design requirements, the air supply control structure is a one-way air intake valve 22 provided on the movable plug 2 for controlling the opening or closing of the air supply hole 21.

[0060] like Figure 1-6 As shown, in order to prevent liquid from remaining on the outer wall of the inlet and outlet pipes and to prevent the liquid in the liquid storage cavity from flowing out of the connecting hole sleeve, the sealing sleeve 121 is made of a deformable silicone material.

[0061] like Figure 1 , 4 As shown, according to design requirements, a locking structure 4 is provided between the liquid inlet and outlet pipe 3 and the movable plug 2 so that when the movable plug 2 moves relative to the liquid pumping cylinder 1, the liquid inlet and outlet pipe 3 can move relative to the liquid pumping cylinder 1.

[0062] like Figure 1 , 4 As shown, according to design requirements, the locking structure 4 includes a static locking block 41 provided on the movable plug 2, and the inlet and outlet pipes 3 are provided with a moving locking block 42 that can be engaged with the static locking block 41. When in use, the inlet and outlet pipes 3 can be rotated to enable the moving locking block 42 to engage or separate with the static locking block 41.

[0063] like Figure 1-6 As shown, the inlet and outlet pipe 3 is provided with a limit stopper 34 which can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the inlet and outlet pipe 3 or the movable plug 2 from being separated from the upper end of the liquid pumping cylinder 1. When pumping liquid, that is, when the movable plug moves upward relative to the liquid pumping cylinder, the limit stopper 34 cooperates with the lower end wall of the connecting hole sleeve 12 to limit the movable plug and the liquid pumping cylinder to ensure the stable operation of the present invention, and at the same time, it is easy to understand whether the first control structure 5 and the second control structure 8 are in the liquid storage cavity, that is, when the limit stopper 34 abuts against the lower end wall of the connecting hole sleeve 12, the first control structure 5 and the second control structure 8 are in the liquid storage cavity; by acting on the limit stopper 34, it is also easy to operate the inlet and outlet pipe activities.

[0064] like Figure 2 , 3 As shown in Figures 4, the liquid inlet and outlet pipe 3 includes an upper pipe 31 slidably connected to the sealing sleeve 121 and a lower pipe 33 movably and sealingly connected to the upper pipe 31. A first control structure 5 is provided between the lower pipe 33 and the upper pipe 31, which can control the connection or isolation between the inner cavity of the liquid inlet and outlet pipe 3 and the outside.

[0065] According to the design requirements, the first control structure 5 includes a first static liquid outlet 51 provided on the side wall of the upper tube 31, and a first dynamic liquid outlet 52 is provided on the side wall of the lower tube 33, which can be aligned or displaced with the first static liquid outlet 51 when the lower tube 33 moves relative to the upper tube 31. When the liquid storage chamber is filled with a certain amount of liquid, and the first control structure 5 is in the liquid storage chamber, the lower tube 33 is operated to move relative to the upper tube 31 so that the first dynamic liquid outlet 52 is aligned and connected with the first static liquid outlet 51, and then the inner cavity of the inlet and outlet pipe is connected with the liquid storage chamber, and at the same time, the air replenishment control structure is operated to open the air replenishment hole, so that the liquid in the liquid storage chamber flows into the inlet and outlet pipe 3 through the first static liquid outlet 51 and the first dynamic liquid outlet 52, and then flows out from the lower port of the inlet and outlet pipe 3, which has the characteristic of convenient liquid discharge.

[0066] like Figure 2 , 4 As shown, a limiting structure 6 is provided between the lower tube 33 and the upper tube 31 and can cooperate with the first control structure 5 to control the connection or isolation between the inner cavity of the inlet and outlet liquid pipe 3 and the outside.

[0067] According to design requirements, in order to facilitate the control of the first control structure 5 and connect or isolate the inner cavity of the inlet and outlet liquid pipes with the outside, the limiting structure 6 includes a limiting protrusion 61 arranged on the inner wall of the upper tube 31, and a limiting groove 62 that can cooperate with the limiting protrusion 61 for limiting is provided on the side wall of the lower tube 33.

[0068] like Figure 2 , 3 As shown, in order to reduce manufacturing costs, the upper tube 31 and the movable plug 2 are integrally formed.

[0069] like Figure 5 , 6 As shown, the liquid inlet and outlet pipe 3 includes an upper tube 31 slidably connected to the sealing sleeve 121, a middle tube 32 is slidably and sealedly connected inside the upper tube 31, and the middle tube 32 is movably and sealedly connected to the lower tube 33, a limiting structure 7 is provided between the lower tube 33 and the upper tube 31, which can make the middle tube 32 extend or fix relative to the upper tube 31, and a second control structure 8 is provided between the lower tube 33 and the middle tube 32, which can control the connection or isolation between the inner cavity of the liquid inlet and outlet pipe 3 and the outside.

[0070] Further, the limiting structure 7 includes an upper limiting column 71 disposed in the upper tube 31, and a lower limiting column 72 is disposed in the lower tube 33, which can be aligned or misaligned with the upper limiting column 71 when the lower tube 33 moves relative to the upper tube 31. When in use, by controlling the lower tube 33 to move relative to the upper tube 31, the lower limiting column 72 can be aligned or misaligned with the upper limiting column 71, so that the middle tube 32 can be extended or fixed relative to the upper tube 31; for example, when pumping liquid, the lower tube 33 is operated to move relative to the upper tube 31 so that the lower limiting column 72 is aligned with the upper limiting column 71, so that the middle tube 32 can be fixed relative to the upper tube 31 and the middle tube 32 extends out of the upper tube 31. After the pumping is completed, the lower tube 33 is operated to move relative to the upper tube 31 so that the lower limiting column 72 is misaligned with the upper limiting column 71, so that the middle tube 32 can be retracted into the upper tube 31, which has the characteristics of reasonable design and space saving.

[0071] Furthermore, the second control structure 8 includes a second static liquid outlet 81 provided on the side wall of the middle tube 32, and a second dynamic liquid outlet 82 is provided on the side wall of the lower tube 33, which can be aligned or misaligned with the second static liquid outlet 81 when the lower tube 33 moves relative to the upper tube 31. When the liquid storage chamber is filled with a certain amount of liquid, and the second control structure 8 is in the liquid storage chamber, the lower tube 33 is operated to move relative to the middle tube 32 so that the second dynamic liquid outlet 82 is aligned and connected with the second static liquid outlet 81, and then the inner cavity of the inlet and outlet pipe is connected with the liquid storage chamber, and at the same time, the air replenishment control structure is operated to open the air replenishment hole, so that the liquid in the liquid storage chamber flows into the inlet and outlet pipe through the second static liquid outlet 81 and the second dynamic liquid outlet 82, and then flows out from the lower port of the inlet and outlet pipe, which has the characteristics of convenient and smooth liquid discharge.

[0072] like Figure 5 , 6 As shown, in order to facilitate the control of the second control structure 8 to connect the inner cavity of the inlet and outlet pipe with the outside, a fixed position structure 80 is provided between the middle tube 32 and the upper tube 31, which can cooperate with the second control structure 8 to control the connection or isolation of the inner cavity of the inlet and outlet pipe 3 with the outside. The structure of the fixed position structure 80 is the same as that of the limiting structure 6.

[0073] like Figure 5 As shown, in order to reduce manufacturing costs, the upper tube 31 and the movable plug 2 are integrally formed.

[0074] For ease of use, the liquid extraction cylinder 1 or the movable plug 2 is provided with a grip for the user to hold.

[0075] The working principle of the first specific embodiment in scheme 1 is:

[0076] like Figure 1When the liquid in the liquid storage chamber 11 reaches the required amount, the one-way air inlet valve 22 is operated to open the air replenishment hole 21 to connect the outside with the inner cavity of the liquid inlet and outlet pipe 3. Under the action of the external atmospheric pressure, the residual liquid in the liquid inlet and outlet pipe 3 flows back into the container. When the liquid in the liquid inlet and outlet pipe 3 all flows back into the container, the liquid in the liquid inlet and outlet pipe 3 is completely separated from the container, so that the liquid can be avoided from spilling out when the liquid inlet and outlet pipe 3 is separated from the container, causing waste. At the same time, by providing a sealing sleeve 121 in the connecting hole sleeve 12, it can be ensured that there is no residual liquid on the outer wall of the liquid inlet and outlet pipe 3, which has the characteristics of cleanliness and convenience in operation.

[0077] The working principles of the second, third and fourth specific embodiments in scheme 1 are as follows:

[0078] like Figure 2 , 3 When the liquid in the liquid storage chamber 11 reaches the required amount, the one-way air inlet valve 22 is operated to open the air replenishment hole 21 to connect the outside with the inner cavity of the liquid inlet and outlet pipe 3. Under the action of the external atmospheric pressure, the residual liquid in the liquid inlet and outlet pipe 3 flows back into the container. When the liquid in the liquid inlet and outlet pipe 3 all flows back into the container, the liquid in the liquid inlet and outlet pipe 3 is completely separated from the container, so that the liquid can be avoided from spilling out when the liquid inlet and outlet pipe 3 is separated from the container, causing waste. At the same time, by providing a sealing sleeve 121 in the connecting hole sleeve 12, it can be ensured that there is no residual liquid on the outer wall of the liquid inlet and outlet pipe 3, which has the characteristics of cleanliness and convenience in operation. In the second and fourth specific embodiments, the lower tube 33 is operated to rotate relative to the upper tube 31 so that the first movable liquid outlet 52 is aligned or misaligned with the first static liquid outlet 51; in the third specific embodiment, the lower tube 33 is operated to move up and down relative to the upper tube 31 so that the first movable liquid outlet 52 is aligned or misaligned with the first static liquid outlet 51.

[0079] When pouring liquid, when the first control structure 5 is outside the liquid storage chamber, the liquid in the liquid storage chamber flows into the liquid inlet and outlet pipe from the liquid inlet and outlet window, and then flows out from the lower port of the liquid inlet and outlet pipe; or, when the first control structure 5 is in the liquid storage chamber, the first dynamic liquid outlet 52 is operated to align and connect with the first static liquid outlet 51, and the one-way air inlet valve is opened, so that the liquid in the liquid storage chamber can flow from the first control structure 5 into the liquid inlet and outlet pipe, and then flow out from the lower port of the liquid inlet and outlet pipe.

[0080] The working principles of the fifth and sixth specific embodiments in Scheme 1 are the same as the working principles of the second and third specific embodiments in Scheme 1.

[0081] Option 2:

[0082] like Figure 7 As shown, the present invention is a liquid pumping device for a container, comprising a liquid pumping cylinder 1, the inner side wall of the liquid pumping cylinder 1 is sealedly connected to a movable plug 2 that can slide relative to the liquid pumping cylinder 1, the inner cavity of the liquid pumping cylinder 1 forms a liquid storage chamber 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, a sealing sleeve 121 is provided in the connecting hole sleeve 12, an inlet and outlet pipe 3 communicating with the liquid storage chamber 11 is slidably connected in the sealing sleeve 121, a side wall of the liquid inlet and outlet pipe 3 is provided with a liquid inlet and outlet window 311 that can communicate with the liquid storage chamber 11, a gas replenishing through hole 35 is provided on the side wall of the liquid inlet and outlet pipe 3 and located below the liquid inlet and outlet window 311, which is isolated from the outside during liquid pumping and can be connected to the outside when the liquid pumping is completed and the liquid inlet and outlet window 311 is blocked by the sealing sleeve 121, a locking structure 4 is provided between the liquid inlet and outlet pipe 3 and the movable plug 2, which can move relative to the liquid pumping cylinder 1 together with the liquid inlet and outlet pipe 3 when the movable plug 2 moves relative to the liquid pumping cylinder 1 When the liquid in the liquid storage cavity reaches the required amount, the inlet and outlet pipes are operated to disengage the inlet and outlet pipes from the movable plug, and then the liquid pumping cylinder is operated to separate the liquid pumping cylinder from the container. In this process, the inlet and outlet pipes are relatively close to each other, so that the movable plug moves upward. The liquid pumping cylinder slides. When the liquid pumping cylinder moves to the position where the sealing sleeve blocks the liquid inlet and outlet windows, the air replenishing hole is connected to the outside. Under the action of the external atmospheric pressure, the residual liquid in the liquid inlet and outlet pipes flows back into the container. When all the liquid in the liquid inlet and outlet pipes flows back into the container, the liquid inlet and outlet pipes are completely separated from the container, which can avoid liquid spilling out when the liquid inlet and outlet pipes are separated from the container and cause waste. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can ensure that there is no residual liquid on the outer wall of the liquid inlet and outlet pipes, which has the characteristics of cleanliness, hygiene and easy operation.

[0083] The second solution can also be realized by operating the movable plug to move relative to the liquid pumping cylinder, thereby moving together with the liquid inlet and outlet pipes.

[0084] like Figure 7 As shown, according to design requirements, the clamping structure 4 includes a static clamping block 41 provided on the movable plug 2, and the inlet and outlet pipes 3 are provided with a dynamic clamping block 42 that can be engaged with the static clamping block 41. When in use, the inlet and outlet pipes are connected or disconnected from the movable plug through the clamping structure 4 according to use requirements.

[0085] like Figure 7 As shown, the inlet and outlet pipe 3 is provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug 2 from being separated from the upper end of the liquid pumping cylinder 1. When pumping liquid, that is, when the movable plug moves upward relative to the liquid pumping cylinder, the limit stopper 34 cooperates with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug from being separated from the liquid pumping cylinder, thereby ensuring the stable operation of the present invention and facilitating the operation of the inlet and outlet pipe.

[0086] like Figure 7 As shown, in order to prevent liquid from remaining on the outer wall of the inlet and outlet pipes and to prevent the liquid in the liquid storage cavity from flowing out of the connecting hole sleeve, the sealing sleeve 121 is made of a deformable silicone material.

[0087] For ease of use, the liquid extraction cylinder 1 or the movable plug 2 is provided with a grip for the user to hold.

[0088] Option 3:

[0089] like Figure 8As shown, the present invention is a liquid pumping device for a container, comprising a liquid pumping cylinder 1, wherein the inner side wall of the liquid pumping cylinder 1 is sealingly connected to a movable plug 2 that can slide relative to the liquid pumping cylinder 1, the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, a sealing sleeve 121 is provided in the connecting hole sleeve 12, a liquid inlet and outlet pipe 3 communicating with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, a liquid inlet and outlet window 311 that can communicate with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, an air replenishing through hole 35 that is isolated from the outside during liquid pumping and can be connected to the outside when liquid pumping is completed is provided on the side wall of the liquid inlet and outlet pipe 3 and located below the liquid inlet and outlet window 311, a locking structure 4 that can move relative to the liquid pumping cylinder 1 together with the liquid inlet and outlet pipe 3 when the movable plug 2 moves relative to the liquid pumping cylinder 1 is provided. When pumping liquid, the lower end of the inlet and outlet pipe is connected with the inner cavity of the container and the lower end of the inlet and outlet pipe is against the mouth or outer wall of the container. The liquid pumping cylinder is operated to move toward one side of the container, and the liquid in the inner cavity of the container enters the liquid storage cavity from the inlet and outlet pipe and through the inlet and outlet window. When the liquid in the liquid storage cavity reaches the required amount, the inner cavity of the inlet and outlet pipe is connected with the outside through the air replenishing hole. Under the action of the external atmospheric pressure, the residual liquid in the inlet and outlet pipe flows back into the container. When the liquid in the inlet and outlet pipe is completely returned to the container, the inlet and outlet pipe is completely separated from the container, which can avoid liquid spilling out when the inlet and outlet pipe is separated from the container, causing waste. At the same time, by arranging a sealing sleeve in the connecting hole sleeve, it can ensure that there is no residual liquid on the outer wall of the inlet and outlet pipe, which has the characteristics of cleanliness and convenience in operation.

[0090] like Figure 8 As shown, the clamping structure 4 includes a static clamping block 41 provided on the movable plug 2, and the liquid inlet and outlet pipe 3 is provided with a dynamic clamping block 42 that can be engaged with the static clamping block 41. When in use, the liquid inlet and outlet pipe is connected or disconnected with the movable plug by controlling the clamping structure 4 according to the use requirements.

[0091] like Figure 8 As shown, the inlet and outlet pipe 3 is provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug 2 from being separated from the upper end of the liquid pumping cylinder 1. When pumping liquid, that is, when the movable plug moves upward relative to the liquid pumping cylinder, the limit stopper 34 cooperates with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug from being separated from the liquid pumping cylinder, thereby ensuring the stable operation of the present invention and facilitating the operation of the inlet and outlet pipe.

[0092] like Figure 8 As shown, in order to prevent liquid from remaining on the outer wall of the inlet and outlet pipes and to prevent the liquid in the liquid storage cavity from flowing out of the connecting hole sleeve, the sealing sleeve 121 is made of a deformable silicone material.

[0093] like Figure 8As shown, the liquid inlet and outlet pipe 3 includes an upper tube 31 slidably connected to the sealing sleeve 121 and a lower tube 33 movably and sealingly connected to the upper tube 31, and a first control structure 5 is provided between the lower tube 33 and the upper tube 31 to control whether the inner cavity of the liquid inlet and outlet pipe 3 is connected or isolated from the outside.

[0094] like Figure 8 As shown, the first control structure 5 includes a first static liquid outlet 51 provided on the side wall of the upper tube 31, and a first dynamic liquid outlet 52 is provided on the side wall of the lower tube 33, which can be aligned or misaligned with the first static liquid outlet 51 when the lower tube 33 moves relative to the upper tube 31. When the liquid storage cavity is filled with a certain amount of liquid, and the first control structure 5 is in the liquid storage cavity, the lower tube 33 is operated to move relative to the upper tube 31 so that the first dynamic liquid outlet 52 is aligned and connected with the first static liquid outlet 51, and then the inner cavity of the inlet and outlet pipe is connected with the liquid storage cavity, and the gas replenishment through hole is operated to connect the inner cavity of the inlet and outlet pipe with the outside, so that the liquid in the liquid storage cavity flows into the inlet and outlet pipe through the first static liquid outlet 51 and the first dynamic liquid outlet 52, and then flows out from the lower port of the inlet and outlet pipe, which has the characteristics of convenient and smooth liquid discharge.

[0095] like Figure 8 As shown, the air replenishing through hole 35 includes an upper through hole 351 provided on the side wall of the upper tube 31, and a lower through hole 352 is provided on the side wall of the lower tube 33, which can be aligned or misaligned with the upper through hole 351 when the lower tube 33 moves relative to the upper tube 31 so as to make the inner cavity of the inlet and outlet tube 3 communicate with or isolate the outside. When the liquid in the liquid storage cavity reaches the required amount, the lower through hole 352 is aligned and communicated with the upper through hole 351 by operating the lower tube 33 to move relative to the upper tube 31, thereby making the inner cavity of the inlet and outlet tube communicate with the outside. Under the action of the external atmospheric pressure, the residual liquid in the inlet and outlet tube flows back into the container. When the liquid in the inlet and outlet tube is completely returned to the container, the inlet and outlet tube is completely separated from the container, which can prevent the liquid from spilling out when the inlet and outlet tube is separated from the container, causing waste.

[0096] like Figure 8 As shown, in order to facilitate the control of the first control structure 5 or the air-injection through hole 35 to connect or isolate the inner cavity of the inlet and outlet pipes with the outside, a limiting structure 6 is provided between the lower tube 33 and the upper tube 31, which can cooperate with the first control structure 5 or the air-injection through hole 35 to control the inner cavity of the inlet and outlet pipes 3 to connect or isolate with the outside. The structure of the limiting structure 6 is the same as that of the limiting structure 6 in the first solution.

[0097] For ease of use, the liquid extraction cylinder 1 or the movable plug 2 is provided with a grip for the user to hold.

[0098] like Fig. 9As shown, the present invention includes a liquid pumping cylinder 1, the inner side wall of the liquid pumping cylinder 1 is sealedly connected to a movable plug 2 that can slide relative to the liquid pumping cylinder 1, the inner cavity of the liquid pumping cylinder 1 forms a liquid storage cavity 11, so a connecting hole sleeve 12 is provided on the liquid pumping cylinder 1, a sealing sleeve 121 is provided in the connecting hole sleeve 12, a liquid inlet and outlet pipe 3 communicating with the liquid storage cavity 11 is slidably connected in the sealing sleeve 121, a liquid inlet and outlet window 311 that can communicate with the liquid storage cavity 11 is provided on the side wall of the liquid inlet and outlet pipe 3, and the liquid inlet and outlet pipe 3 and the movable plug 2 are an integrally formed structure. When pumping liquid, the lower end of the inlet and outlet pipe is connected to the inner cavity of the container and the lower end of the inlet and outlet pipe is against the mouth or outer wall of the container. The pumping cylinder is operated to move toward one side of the container, so that the upper end of the inlet and outlet pipe pushes the movable plug and the inlet and outlet pipe moves upward relative to the pumping cylinder. The liquid in the inner cavity of the container enters the liquid storage cavity from the inlet and outlet pipe and through the inlet and outlet window. At the same time, a sealing sleeve is provided in the connecting hole sleeve to ensure that there is no residual liquid on the outer wall of the inlet and outlet pipe, which is clean, hygienic and easy to operate.

[0099] like Fig. 9 As shown, the inlet and outlet pipe 3 is provided with a limit stopper 34 that can cooperate with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug 2 from being separated from the upper end of the liquid pumping cylinder 1. When pumping liquid, that is, when the movable plug moves upward relative to the liquid pumping cylinder, the limit stopper 34 cooperates with the lower end wall of the connecting hole sleeve 12 to prevent the movable plug from being separated from the liquid pumping cylinder, thereby ensuring the stable operation of the present invention and facilitating the operation of the inlet and outlet pipe.

[0100] like Fig. 9 As shown, in order to prevent liquid from remaining on the outer wall of the inlet and outlet pipes and to prevent the liquid in the liquid storage cavity from flowing out of the connecting hole sleeve, the sealing sleeve 121 is made of a deformable silicone material.

[0101] For ease of use, the liquid extraction cylinder 1 or the movable plug 2 is provided with a grip for the user to hold.

Claims

1. A liquid extraction device for a container, characterized in that The invention comprises a liquid pumping cylinder (1), wherein the inner side wall of the liquid pumping cylinder (1) is sealingly connected to a movable plug (2) which can slide relative to the liquid pumping cylinder (1), and the inner cavity of the liquid pumping cylinder (1) forms a liquid storage cavity (11), so the liquid pumping cylinder (1) is provided with a connecting hole sleeve (12), a sealing sleeve (121) is provided in the connecting hole sleeve (12), a liquid inlet and outlet pipe (3) which is in communication with the liquid storage cavity (11) is slidably connected in the sealing sleeve (121), a liquid inlet and outlet window (311) which can communicate with the liquid storage cavity (11) is provided on the side wall of the liquid inlet and outlet pipe (3), an air replenishing hole (21) which is in communication with the inner cavity of the liquid inlet and outlet pipe (3) is provided on the movable plug (2), and an air replenishing control structure which is used to control the opening or closing of the air replenishing hole (21) so that the inner cavity of the liquid inlet and outlet pipe (3) is in communication with or isolated from the outside is provided on the movable plug (2).

2. A liquid extraction device for a container according to claim 1, characterized in that The air supply control structure is a one-way air intake valve (22) provided on the movable plug (2) and used for controlling the opening or closing of the air supply hole (21).

3. A liquid extraction device for a container according to claim 1, characterized in that A locking structure (4) is provided between the liquid inlet and outlet pipe (3) and the movable plug (2), which can move together with the liquid inlet and outlet pipe (3) relative to the liquid pumping cylinder (1) when the movable plug (2) moves relative to the liquid pumping cylinder (1).

4. A liquid extraction device for a container according to claim 3, characterized in that The locking structure (4) comprises a static locking block (41) provided on the movable plug (2), and a movable locking block (42) capable of engaging with the static locking block (41) is provided on the liquid inlet and outlet pipes (3).

5. A liquid extraction device for a container according to any one of claims 1 to 4, characterized in that The liquid inlet and outlet pipe (3) comprises an upper pipe (31) slidably connected to the sealing sleeve (121) and a lower pipe (33) movably and sealingly connected to the upper pipe (31), and a first control structure (5) capable of controlling whether the inner cavity of the liquid inlet and outlet pipe (3) is connected to or isolated from the outside is provided between the lower pipe (33) and the upper pipe (31).

6. A liquid extraction device for a container according to claim 5, characterized in that The first control structure (5) comprises a first static liquid outlet (51) provided on a side wall of the upper tube (31), and a first movable liquid outlet (52) is provided on a side wall of the lower tube (33) so as to be aligned with or offset from the first static liquid outlet (51) when the lower tube (33) moves relative to the upper tube (31).

7. A liquid extraction device for a container according to any one of claims 1 to 4, characterized in that The liquid inlet and outlet pipe (3) comprises an upper pipe (31) slidably connected to a sealing sleeve (121); a middle pipe (32) is slidably and sealably connected inside the upper pipe (31); the middle pipe (32) is movably and sealably connected to a lower pipe (33); a limiting structure (7) is provided between the lower pipe (33) and the upper pipe (31) and is capable of enabling the middle pipe (32) to be extended or fixed relative to the upper pipe (31); and a second control structure (8) is provided between the lower pipe (33) and the middle pipe (32) and is capable of controlling whether the inner cavity of the liquid inlet and outlet pipe (3) is connected to or isolated from the outside.

8. A liquid extraction device for a container according to claim 7, characterized in that The limiting structure (7) comprises an upper limiting column (71) disposed in the upper tube (31), and a lower limiting column (72) is disposed in the lower tube (33) and can be aligned or misaligned with the upper limiting column (71) when the lower tube (33) moves relative to the upper tube (31).

9. A liquid extraction device for a container according to claim 7, characterized in that The second control structure (8) comprises a second static liquid outlet (81) provided on the side wall of the middle tube (32), and a second movable liquid outlet (82) is provided on the side wall of the lower tube (33) so as to be aligned with or offset from the second static liquid outlet (81) when the lower tube (33) moves relative to the upper tube (31).

10. A liquid extraction device for a container, characterized in that The invention comprises a liquid pumping cylinder (1), wherein the inner side wall of the liquid pumping cylinder (1) is sealedly connected to a movable plug (2) which can slide relative to the liquid pumping cylinder (1), and the inner cavity of the liquid pumping cylinder (1) forms a liquid storage cavity (11), so the liquid pumping cylinder (1) is provided with a connecting hole sleeve (12), and a sealing sleeve (121) is provided in the connecting hole sleeve (12), and a liquid inlet and outlet pipe (3) which is in communication with the liquid storage cavity (11) is slidably connected in the sealing sleeve (121), and a side wall of the liquid inlet and outlet pipe (3) is provided which can communicate with the liquid storage cavity (11). A liquid inlet and outlet window (311) is connected to the liquid inlet and outlet window (311); a gas replenishing through hole (35) is provided on the side wall of the liquid inlet and outlet pipe (3) and located below the liquid inlet and outlet window (311), which is isolated from the outside when liquid is pumped and can be connected to the outside when liquid pumping is completed and the liquid inlet and outlet window (311) is blocked by the sealing sleeve (121); and a locking structure (4) is provided between the liquid inlet and outlet pipe (3) and the movable plug (2), which can move together with the liquid inlet and outlet pipe (3) relative to the liquid pumping cylinder (1) when the movable plug (2) moves relative to the liquid pumping cylinder (1).

11. A liquid extraction device for a container, characterized in that The invention comprises a liquid pumping cylinder (1), wherein the inner side wall of the liquid pumping cylinder (1) is sealedly connected to a movable plug (2) which can slide relative to the liquid pumping cylinder (1), and the inner cavity of the liquid pumping cylinder (1) forms a liquid storage cavity (11), so the liquid pumping cylinder (1) is provided with a connecting hole sleeve (12), and a sealing sleeve (121) is provided in the connecting hole sleeve (12), and a liquid inlet and outlet pipe (3) which is in communication with the liquid storage cavity (11) is slidably connected in the sealing sleeve (121), and the side wall of the liquid inlet and outlet pipe (3) is A liquid inlet and outlet window (311) which can be communicated with the liquid storage chamber (11) is provided on the upper side, and an air replenishing hole (35) which is isolated from the outside when the liquid is pumped and can be communicated with the outside when the liquid pumping is completed is provided on the side wall of the liquid inlet and outlet pipe (3) and located below the liquid inlet and outlet window (311), and which can be connected with the outside when the liquid pumping is completed, and a locking structure (4) which can move together with the liquid inlet and outlet pipe (3) relative to the liquid pumping cylinder (1) when the movable plug (2) moves relative to the liquid pumping cylinder (1) is provided between the liquid inlet and outlet pipe (3) and the movable plug (2).

12. A liquid extraction device for a container according to claim 11, characterized in that The liquid inlet and outlet pipe (3) comprises an upper pipe (31) slidably connected to the sealing sleeve (121) and a lower pipe (33) movably and sealingly connected to the upper pipe (31), and a first control structure (5) capable of controlling whether the inner cavity of the liquid inlet and outlet pipe (3) is connected to or isolated from the outside is provided between the lower pipe (33) and the upper pipe (31).

13. A liquid extraction device for a container according to claim 12, characterized in that The first control structure (5) comprises a first static liquid outlet (51) provided on a side wall of the upper tube (31), and a first movable liquid outlet (52) is provided on a side wall of the lower tube (33) so as to be aligned with or offset from the first static liquid outlet (51) when the lower tube (33) moves relative to the upper tube (31).

14. A liquid extraction device for a container according to any one of claims 12 to 13, characterized in that The air replenishing through hole (35) comprises an upper through hole (351) provided on the side wall of the upper tube (31), and a lower through hole (352) is provided on the side wall of the lower tube (33) so that when the lower tube (33) moves relative to the upper tube (31), it can be aligned with or misaligned with the upper through hole (351) to connect or isolate the inner cavity of the inlet and outlet tube (3) from the outside.

15. A liquid extraction device for a container, characterized in that The invention comprises a liquid pumping cylinder (1), wherein the inner side wall of the liquid pumping cylinder (1) is sealingly connected to a movable plug (2) capable of sliding relative to the liquid pumping cylinder (1), and the inner cavity of the liquid pumping cylinder (1) forms a liquid storage cavity (11), so the liquid pumping cylinder (1) is provided with a connecting hole sleeve (12), a sealing sleeve (121) is provided in the connecting hole sleeve (12), a liquid inlet and outlet pipe (3) communicating with the liquid storage cavity (11) is slidably connected in the sealing sleeve (121), a liquid inlet and outlet window (311) capable of communicating with the liquid storage cavity (11) is provided on the side wall of the liquid inlet and outlet pipe (3), and the liquid inlet and outlet pipe (3) and the movable plug (2) are integrally formed structures; The movable plug (2) is provided with an air replenishing hole (21) which is in communication with the inner cavity of the liquid inlet and outlet pipe (3); Alternatively, a gas replenishing through hole (35) is provided on the side wall of the liquid inlet and outlet pipe (3) and located below the liquid inlet and outlet window (311), which is isolated from the outside during liquid extraction and can be connected to the outside when liquid extraction is completed.

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