Cleaning unit for a liquid taking needle and liquid taking device comprising same

Abstract

The application provides a cleaning unit of a liquid taking needle and a liquid taking device comprising the same. The cleaning unit comprises a cleaning cavity and a cleaning chamber formed in the cleaning cavity. The cleaning cavity is adapted to allow the liquid taking needle to partially pass through to enter and / or exit the cleaning chamber and to be in sealed connection with the liquid taking needle when the liquid taking needle partially enters and / or exits the cleaning chamber, so that the cleaning chamber forms a closed space to introduce cleaning liquid in the closed space and clean the liquid taking needle by the cleaning liquid. The application can timely and sufficiently clean the liquid taking needle without disassembling the liquid taking needle, which is not only convenient to operate but also simple in structure and beneficial to save cost. Meanwhile, the cleaning liquid can be introduced in the sealed cleaning chamber in the closed space, which cannot cause leakage of the cleaning liquid and can effectively avoid pollution or influence of the cleaning liquid on the whole liquid taking device.

Description

Technical Field

[0001] This invention relates to the field of wine machine technology, and more particularly to a cleaning unit for a liquid-collecting needle and a liquid-collecting device comprising the same. Background Technology

[0002] A wine dispenser is a device that dispenses wine without needing to open the bottle cork. It allows people to enjoy wine more conveniently while avoiding oxidation problems caused by opening the bottle, thus preserving the wine's quality and taste for longer. However, each time a wine dispenser is used, the dispensing needle comes into contact with the wine. If the needle is not cleaned promptly, wine residue will remain, leading to bacterial growth and cross-contamination. Summary of the Invention

[0003] The purpose of this invention is to provide a cleaning unit for a liquid collection needle and a liquid collection device including the same. The cleaning unit includes a cleaning chamber and a cleaning cavity formed within the cleaning chamber. The cleaning chamber is adapted to allow a portion of the liquid collection needle to pass through to enter and / or exit the cleaning cavity, and to be sealed to the liquid collection needle when the portion of the liquid collection needle enters and / or exits the cleaning cavity, thereby forming a sealed space within the cleaning cavity to introduce cleaning fluid and clean the liquid collection needle. This invention allows for timely and thorough cleaning of the liquid collection needle without disassembling it, which is not only convenient to operate but also simple in construction, thus saving costs. Furthermore, the introduction of cleaning fluid into the sealed cleaning cavity within the sealed space prevents leakage of the cleaning fluid, effectively avoiding contamination or impact on the entire liquid collection device.

[0004] Therefore, the present invention provides the following technical solution:

[0005] One aspect of the present invention is to provide a cleaning unit for a liquid collection needle. The cleaning unit includes a cleaning cavity and a cleaning chamber formed within the cleaning cavity; the cleaning cavity is adapted to allow a portion of the liquid collection needle to pass through to enter and / or exit the cleaning chamber, and to be sealingly connected to the liquid collection needle when the portion of the liquid collection needle enters and / or exits the cleaning chamber; the cleaning chamber is adapted to receive a cleaning fluid for cleaning the liquid collection needle.

[0006] In some embodiments, the sampling needle includes a hollow sampling needle chamber and a sampling needle inlet communicating with the sampling needle chamber; the sampling needle inlet is adapted to be exposed to the cleaning chamber when the sampling needle portion enters the cleaning chamber, so as to receive the cleaning fluid and clean the sampling needle chamber with the cleaning fluid.

[0007] In some embodiments, the cleaning chamber includes an inlet portion; the inlet portion is adapted to allow the sampling needle portion to pass through to enter the cleaning chamber, and to tightly wrap around the outer periphery of the sampling needle and seal it in connection with the sampling needle when the sampling needle portion enters the cleaning chamber.

[0008] In some embodiments, the inlet is elastic and adapted to compress and deform to tightly wrap around the outer periphery of the needle at least when the needle portion enters the cleaning chamber.

[0009] In some embodiments, the cleaning chamber further includes an outlet portion; the outlet portion is adapted to allow the needle portion to pass through and exit the cleaning chamber; the outlet portion is resilient and adapted to seal when the needle portion enters the cleaning chamber and to tightly wrap around the outer periphery of the needle and seal with the needle when the needle portion exits the cleaning chamber.

[0010] In some embodiments, the direction in which the liquid collection needle enters and exits the cleaning chamber is the same; the cleaning chamber is also adapted to serve as the needle insertion channel for the liquid collection needle.

[0011] In some embodiments, the cleaning chamber is further adapted to form an air needle channel independent of the cleaning chamber; the air needle channel is arranged in parallel with the needle inlet channel and is adapted to allow the inflation needle to enter and exit.

[0012] Another aspect of the present invention is to provide a liquid extraction device including the cleaning unit. The liquid extraction device is used to extract liquid from a container, the container including a container opening and a stopper disposed at the container opening; the extraction needle is adapted to pierce the stopper and extract the liquid from the container.

[0013] In some embodiments, the liquid extraction device further includes a cleaning fluid pipeline, a cleaning fluid pump, and a cleaning fluid tank connected in sequence to the cleaning chamber; the cleaning fluid tank is adapted to contain cleaning fluid; and the cleaning fluid pump is adapted to deliver the cleaning fluid to the cleaning chamber via the cleaning fluid pipeline.

[0014] In some embodiments, the liquid collection device further includes a liquid outlet line communicating with the liquid collection needle; the liquid outlet line is adapted to output the liquid extracted by the liquid collection needle or the cleaning solution used to clean the liquid collection needle.

[0015] Compared with the prior art, the technical solution of the present invention has at least the following beneficial effects.

[0016] For example, the cleaning unit provided by this invention includes a cleaning chamber and a cleaning cavity formed within the cleaning chamber. The cleaning chamber is adapted to allow a portion of the sampling needle to pass through to enter and / or exit the cleaning cavity, and to be sealed to the sampling needle when the portion of the sampling needle enters and / or exits the cleaning cavity, thereby forming a sealed space within the cleaning cavity to introduce cleaning fluid and clean the sampling needle. This invention allows for timely and thorough cleaning of the sampling needle without disassembling it, offering convenient operation, simple construction, and cost savings. Furthermore, the introduction of cleaning fluid into the sealed space prevents leakage, effectively avoiding contamination or impact on the entire sampling device. Attached Figure Description

[0017] Figure 1 This is an internal schematic diagram of the liquid extraction device provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the liquid extraction device provided in an embodiment of the present invention, wherein the liquid extraction needle is in the extraction state;

[0019] Figure 3 This is a schematic diagram of the liquid collection device provided in an embodiment of the present invention; wherein the liquid collection needle is in the state where its front end has just entered the cleaning chamber;

[0020] Figure 4 This is a schematic diagram of the liquid collection device provided in an embodiment of the present invention; wherein the liquid collection needle is in a cleanable state;

[0021] Figure 5 This is a schematic diagram of the cleaning unit provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the liquid collection needle provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Liquid collection device;

[0025] 10. Liquid collection needle, 11. Liquid collection needle chamber, 12. Liquid collection needle inlet, 13. Outer periphery, 14. Liquid collection needle outlet;

[0026] 20 Cleaning unit, 21 Cleaning chamber, 22 Cleaning chamber, 23 Inlet, 24 Outlet, 25 Liquid outlet line, 26 Cleaning fluid line, 27 Cleaning fluid pump, 28 Cleaning fluid tank, 29 Air needle channel.

[0027] 30 Container, 31 Container opening, 32 Stopper;

[0028] 40 Inflatable needle, 41 Inflatable needle chamber;

[0029] 50 gas cylinders;

[0030] 60 drive mechanism. Detailed Implementation

[0031] To make the objectives, features, and beneficial effects of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described below are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, descriptions of identical or similar components in different embodiments, as well as descriptions of components, features, effects, etc., belonging to the prior art, may be omitted.

[0032] Furthermore, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings, not the entire structure. Also, the same or similar reference numerals may be used in the drawings to refer to the same or similar components in different embodiments.

[0033] Reference Figures 1 to 6 This invention provides a cleaning unit 20 for a liquid collection needle 10 and a liquid collection device 1 including the cleaning unit 20.

[0034] Specifically, the liquid extraction device 1 is used to extract liquid from the container 30. The container 30 includes a container opening 31 and a stopper 32 disposed at the container opening 31. The liquid extraction needle 10 is adapted to pierce the stopper 32 and extract the liquid from the container 30.

[0035] In some embodiments, the liquid extraction device 1 may include a wine extractor and is adapted to extract wine from a wine bottle using a liquid extraction needle 10.

[0036] In some embodiments, the liquid extraction device 1 further includes an inflation needle 40 adapted to pierce the stopper 32.

[0037] In a specific implementation, the inflation needle 40 and the liquid collection needle 10 each have a hollow inflation needle chamber 41 and a liquid collection needle chamber 11, respectively. The inflation needle 40 is adapted to introduce gas into the container 30 through the inflation needle chamber 41 after piercing the stopper 32; the liquid collection needle 10 is adapted to extract the liquid from the container 30 through the liquid collection needle chamber 11 after piercing the stopper 32.

[0038] Specifically, when gas is introduced into container 30 through inflation needle 40, the gas pressure inside container 30 gradually increases. When the gas pressure inside container 30 is greater than the gas pressure outside, under the action of the pressure difference between the inside and outside, the liquid inside container 30 will flow out through the liquid collection needle chamber 11 of liquid collection needle 10, thereby extracting the liquid from container 30.

[0039] In some embodiments, the tip portion of both the inflation needle 40 and the liquid collection needle 10 can be tapered to facilitate piercing the plug 32.

[0040] In some embodiments, the liquid dispensing device 1 further includes a gas cylinder 50 adapted to hold gas and connected to an inflation needle 40, so as to introduce gas into the container 30 through the inflation needle 40.

[0041] In practice, a valve is installed between the gas cylinder 50 and the inflation needle 40, and the gas flow between the gas cylinder 50 and the inflation needle 40 is controlled by opening and closing the valve.

[0042] In some embodiments, the liquid in container 30 may oxidize and deteriorate. In this case, the gas in cylinder 50 can be an inert gas. Introducing an inert gas into container 30 can prevent liquid oxidation and help maintain the original quality of the liquid.

[0043] In some embodiments, the liquid in container 30 can be wine, and the inert gas can be argon. The introduction of argon into container 30 can prevent the wine from oxidizing, thus helping to preserve its freshness for longer.

[0044] In some embodiments, the inflation needle 40 contains air, and the air contains oxygen. To prevent the inflation needle 40 from introducing air into the container 30 when it pierces the stopper 32, the gas cylinder 50 is also adapted to purge the air from the inflation needle 40 by introducing an inert gas into the inflation needle 40 before the inflation needle 40 pierces the stopper 32.

[0045] In some embodiments, the sampling needle 10 itself contains air, and the air contains oxygen. To prevent the sampling needle 10 from introducing air into the container 30 when it pierces the stopper 32, a gas cylinder 50 is also adapted to be connected to the sampling needle 10, and to purge the air from the sampling needle 10 by introducing an inert gas into the sampling needle 10 before the sampling needle 10 pierces the stopper 32.

[0046] In practice, a valve is also installed between the gas cylinder 50 and the liquid collection needle 10. The opening and closing of the valve controls the gas flow between the gas cylinder 50 and the liquid collection needle 10.

[0047] In some embodiments, when the liquid-taking needle 10 pierces the stopper 32, the liquid-taking needle chamber 11 is connected to the container 30 to facilitate the extraction of liquid. At the same time, the liquid-taking needle chamber 11 is also connected to the liquid outlet line 25 to deliver the extracted liquid outward.

[0048] In a specific implementation, the gas cylinder 50 can also be connected to the liquid collection needle 10 and the liquid outlet line 25 respectively, and is suitable for introducing gas into the liquid outlet line 25 and / or the liquid collection needle 10 after liquid extraction is completed, thereby blowing out the residual liquid in the liquid outlet line 25 and / or the liquid collection needle 10. In this way, it can help clean the liquid outlet line 25 and / or the liquid collection needle 10.

[0049] In practice, a valve is also installed between the gas cylinder 50 and the liquid outlet pipeline 25. The gas flow between the gas cylinder 50 and the liquid outlet pipeline 25 is controlled by opening and closing the valve.

[0050] In some embodiments, the liquid collection device 1 further includes a drive mechanism 60 for driving the liquid collection needle 10, the inflation needle 40 and the container 30 to move relatively close to each other, so that the liquid collection needle 10 and the inflation needle 40 can pierce the stopper 32 of the container 30.

[0051] In some embodiments, the container 30 may be kept stationary while the inflation needle 40 and the liquid collection needle 10 are driven to move toward the container 30.

[0052] In some embodiments, the liquid collection needle 10 and the air injection needle 40 are adapted to be simultaneously collected for synchronous movement.

[0053] In some embodiments, the inflation needle 40 and the liquid collection needle 10 may be kept stationary while the drive container 30 moves toward the inflation needle 40 and the liquid collection needle 10.

[0054] In some embodiments, the drive mechanism 60 can be implemented using any technique known in the art. For example, it can be driven by a combination of a motor and a lead screw and nut, wherein the motor is connected to the lead screw, the lead screw is connected to the lead screw and nut, and the lead screw and nut are connected to the inflation needle 40, the liquid collection needle 10, or the container 30. The motor drives the lead screw to rotate, thereby driving the lead screw and nut to move the inflation needle 40 or the liquid collection needle 10 toward the container 30, or to drive the container 30 toward the inflation needle 40 or the liquid collection needle 10.

[0055] Since the retrieval needle 10 comes into contact with liquid every time it performs an extraction operation, if the retrieval needle 10 is not cleaned in a timely and sufficient manner, liquid residue will remain, leading to bacterial growth and cross-contamination. To ensure timely, thorough, and convenient cleaning of the retrieval needle 10, this embodiment of the invention also provides a cleaning unit 20.

[0056] Specifically, the cleaning unit 20 includes a cleaning chamber 21 and a cleaning chamber 22 formed within the cleaning chamber 21. The cleaning chamber 21 is adapted to allow a portion of the retrieval needle 10 to pass through to enter and / or exit the cleaning chamber 22, and to be sealed to the retrieval needle 10 when the retrieval needle 10 partially enters and / or exits the cleaning chamber 22, so that the cleaning chamber 22 forms a closed space; while the cleaning chamber 22 is adapted to receive cleaning fluid to clean the retrieval needle 10 within the closed space.

[0057] Typically, during liquid extraction, the tip of the extraction needle 10 is adapted to pass through the stopper 32 and enter the container 30 to extract the liquid from the container 30 through the extraction needle chamber 11. Accordingly, the extraction needle 10 also includes an extraction needle inlet 12 communicating with the extraction needle chamber 11. The extraction needle inlet 12 is adapted to be exposed inside the container 30 when the tip of the extraction needle 10 passes through the stopper 32 and enters the container 30, to receive the liquid to be extracted. In this case, both the tip of the extraction needle 10 and the extraction needle chamber 11 need to be cleaned promptly after extraction.

[0058] In some embodiments, the tip of the sampling needle 10 is adapted to pass through the cleaning chamber 21 and enter the cleaning chamber 22. Accordingly, a sampling needle inlet 12 is provided at the tip of the sampling needle 10 so that it is exposed to the cleaning chamber 22 when the tip of the sampling needle 10 enters the cleaning chamber 22, thereby facilitating the entry of cleaning fluid in the cleaning chamber 22 into the sampling needle chamber 11 through the sampling needle inlet 12 to clean the sampling needle chamber 11.

[0059] It is understandable that when the tip of the retrieval needle 10 enters the cleaning chamber 22, the tip of the retrieval needle 10 can also be cleaned by the cleaning fluid in the cleaning chamber 22.

[0060] In some embodiments, the cleaning chamber 21 includes an inlet 23. The inlet 23 is adapted to allow a portion of the retrieval needle 10 to pass through and enter the cleaning chamber 22, and to tightly wrap around the outer peripheral side 13 of the retrieval needle 10 and seal it in connection with the retrieval needle 10 when the retrieval needle 10 partially enters the cleaning chamber 22.

[0061] In some embodiments, the inlet portion 23 is elastic and adapted to compress and deform to tightly wrap around the outer peripheral side 13 of the needle 10 at least when the needle 10 partially enters the cleaning chamber 22, and to form a sealed connection with the outer peripheral side 13 of the needle 10.

[0062] In a specific implementation, the inner diameter of the inlet 23 is smaller than the outer diameter of the liquid collection needle 20. When the liquid collection needle 10 passes through the inlet 23, the outer peripheral side 13 of the liquid collection needle 10 will abut against the inner peripheral side of the inlet 23, and the inlet 23 will undergo radial compression deformation to tightly wrap the outer peripheral side 13 of the liquid collection needle 10, thereby forming a sealed connection between the inner peripheral side of the inlet 23 and the outer peripheral side of the liquid collection needle 10.

[0063] In some embodiments, the inlet portion 23 may be made of a flexible silicone material.

[0064] In some embodiments, the inlet portion 23 may also be made of any other elastic material known in the prior art, without limitation.

[0065] In some embodiments, the entire cleaning chamber 21 may also be made of any known elastic material in the prior art, without limitation.

[0066] When the retrieval needle 10 passes through the inlet 23 of the cleaning chamber 21 and partially enters the cleaning chamber 22, the inlet 23 of the cleaning chamber 21 tightly wraps around the outer periphery 13 of the retrieval needle 10 and forms a sealed connection with the outer periphery 13 of the retrieval needle 10, which makes the cleaning chamber 22 a sealed space, thereby preventing the cleaning fluid in the cleaning chamber 22 from leaking.

[0067] As mentioned above, the liquid collection device 1 also includes a liquid outlet pipe 25 connected to the liquid collection needle chamber 11, for outputting the liquid extracted by the liquid collection needle 10 to the outside.

[0068] In some embodiments, the cleaning fluid of the cleaning needle 10 can also be discharged outward through the outlet line 25. Specifically, the cleaning fluid can enter the needle chamber 11 through the needle inlet 12, and then be discharged outward through the outlet line 25.

[0069] In some embodiments, the sampling needle 10 further includes a sampling needle outlet 14 communicating with the sampling needle chamber 11. The sampling needle outlet 14 is adapted to be connected to the discharge line 25 to discharge the cleaning fluid.

[0070] In some embodiments, the liquid collection device 1 or the cleaning unit 20 further includes a cleaning fluid pipeline 26, a cleaning fluid pump 27, and a cleaning fluid tank 28, which are sequentially connected to the cleaning chamber 22. The cleaning fluid tank 28 is adapted to contain cleaning fluid; the cleaning fluid pump 27 is adapted to deliver the cleaning fluid in the cleaning fluid tank 28 to the cleaning chamber 22 via the cleaning fluid pipeline 26 to clean the liquid collection needle 10.

[0071] In some embodiments, the cleaning chamber 21 further includes an outlet 24. The outlet 24 is adapted to allow a portion of the retrieval needle 10 to pass through and exit the cleaning chamber 22.

[0072] In some embodiments, the outlet 24 is adapted to allow the tip of the retrieval needle 10 to pass through and exit the cleaning chamber 22.

[0073] It should be noted that the outlet 24 refers to the outlet from which the tip of the liquid collection needle 10 leaves the cleaning chamber 22 and enters the container 30.

[0074] In a specific implementation, the cleaning unit 20 can be located in front of the container 30, especially the stopper 32, and the liquid-taking needle 10 is adapted to pass through the cleaning unit 20 and then pierce the stopper 32 of the container 30.

[0075] Specifically, the tip of the liquid collection needle 10 first enters the cleaning chamber 22 through the inlet 23 of the cleaning chamber 21, then leaves the cleaning chamber 22 through the outlet 24 of the cleaning chamber 21, and then pierces the stopper 32 to enter the container 30.

[0076] This makes it easier to clean the extraction needle 10 after the liquid has been extracted.

[0077] In some embodiments, the outlet portion 24 is elastic and adapted to seal when the tip of the needle 10 enters the cleaning chamber 22, and to tightly wrap around the outer peripheral side 13 of the needle 10 and seal it with the needle 10 when the tip of the needle 10 leaves the cleaning chamber 22 through the outlet portion 24.

[0078] When the tip of the liquid collection needle 10 enters the cleaning chamber 22 through the inlet 23 of the cleaning chamber 21, the outlet 24 has a very small diameter so that the cleaning fluid in the cleaning chamber 22 cannot leak through the outlet 24, and the cleaning chamber 22 forms a sealed space.

[0079] When the tip of the sampling needle 10 leaves the cleaning chamber 22 through the outlet 24, the outer peripheral side 13 of the sampling needle 10 comes into contact with the inner peripheral side of the outlet 24, causing the outlet 24 to undergo radial compression deformation to tightly wrap the outer peripheral side 13 of the sampling needle 10, thereby forming a sealed connection between the inner peripheral side of the outlet 24 and the outer peripheral side 13 of the sampling needle 10. At the same time, the inner peripheral side of the inlet 23 also forms a sealed connection with the outer peripheral side 13 of the sampling needle 10, and the cleaning chamber 22 also forms a closed space.

[0080] In some embodiments, the outlet section 24 may be made of a specific elastic silicone material.

[0081] In some embodiments, the outlet section 24 may also be made of any other elastic material known in the prior art, without limitation herein.

[0082] As previously mentioned, the cleaning unit 20 can be located in front of the container 30, especially the stopper 32. Thus, the middle part of the needle 10 will also enter the cleaning chamber 22 through the inlet 23 and even exit the cleaning chamber 24 through the outlet 24, so that the tip of the needle 10 can enter the container 30.

[0083] Regardless of whether the middle part of the liquid collection needle 10 enters the clean chamber 22 through the inlet 23 or leaves the clean chamber 24 through the outlet 24, the inner periphery of the inlet 23 and the outlet 24 can be sealed and connected to the corresponding position of the outer periphery 13 of the liquid collection needle 10 so that the clean chamber 22 forms a closed space.

[0084] In some embodiments, only the needle chamber 11 may be cleaned. In this case, the tip of the needle 10 may exit the cleaning chamber 22 through the outlet 24, while the needle inlet 12 is exposed inside the cleaning chamber 22 so that cleaning fluid from the cleaning chamber 22 can be introduced into the needle chamber 11 through the needle inlet 12 for cleaning.

[0085] In some embodiments, the direction in which the retrieval needle 10 exits the cleaning chamber 22 through the outlet 24 is the same as the direction in which it enters the cleaning chamber 22 through the inlet 23. In this case, the cleaning chamber 22 is also adapted to serve as an insertion channel for the retrieval needle 10, so that the retrieval needle 10 can smoothly exit the outlet 24 through the insertion channel and enter the container 30.

[0086] In some embodiments, the cleaning chamber 21 is also adapted to form a needle channel 29 independent of the cleaning chamber 22. The needle channel 29 is arranged alongside the needle inlet channel and is adapted to allow the inflation needle 40 to enter and exit. In this way, the inflation needle 40 and the liquid collection needle 10 can enter and exit the container 30 simultaneously.

[0087] Understandably, when the liquid collection needle 10 needs to be replaced or needs to leave the cleaning unit 20 for other reasons, the liquid collection needle 10 can exit the cleaning chamber 21 from the inlet 23 or sequentially from the outlet 24 and inlet 23 of the cleaning chamber 21. The inflation needle 40 can directly exit the inflation needle channel 29.

[0088] Although specific embodiments of the invention have been described above, these embodiments are not intended to limit the scope of the invention, even when only a single embodiment is described with respect to a particular feature. The feature examples provided in this disclosure are intended to be illustrative and not limiting, unless otherwise stated. In practice, one or more technical features of the dependent claims may be combined with the technical features of the independent claim, as needed and where technically feasible, and the technical features of the corresponding claims may be combined in any suitable manner rather than solely by the specific combinations listed in the claims.

[0089] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A cleaning unit for a liquid taking needle, which liquid taking needle is adapted to pierce a bung of a container to extract liquid from within the container, characterised in that, The cleaning unit comprises a cleaning cavity and a cleaning chamber formed in the cleaning cavity; The cleaning cavity is at least partially located between the container and the liquid taking needle and is adapted to allow the liquid taking needle to partially pass through to enter and / or exit the cleaning chamber and to be in sealing connection with the liquid taking needle when the liquid taking needle partially enters and / or exits the cleaning chamber; the cleaning chamber is adapted to receive cleaning liquid to clean the liquid taking needle by the cleaning liquid; the liquid taking needle comprises a hollow liquid taking needle chamber and a liquid taking needle entry hole in communication with the liquid taking needle chamber; the liquid taking needle entry hole is arranged at the front end of the liquid taking needle and is adapted to be exposed to the cleaning chamber when the liquid taking needle partially enters the cleaning chamber to receive the cleaning liquid and clean the liquid taking needle chamber by the cleaning liquid.

2. The cleaning unit of claim 1, wherein, The cleaning cavity comprises an inlet portion; the inlet portion is adapted to allow the liquid taking needle to partially pass through to enter the cleaning chamber and tightly wrap the outer circumferential side of the liquid taking needle to be in sealing connection with the liquid taking needle when the liquid taking needle partially enters the cleaning chamber.

3. The cleaning unit of claim 1, wherein, The inlet portion is elastic and is adapted to compressively deform to tightly wrap the outer circumferential side of the liquid taking needle at least when the liquid taking needle partially enters the cleaning chamber.

4. The cleaning unit of claim 1, wherein, The cleaning cavity further comprises an outlet portion; the outlet portion is adapted to allow the liquid taking needle to partially pass through to exit the cleaning chamber; the outlet portion is elastic and is adapted to be sealed when the liquid taking needle partially enters the cleaning chamber and tightly wrap the outer circumferential side of the liquid taking needle to be in sealing connection with the liquid taking needle when the liquid taking needle partially exits the cleaning chamber.

5. The cleaning unit of claim 1, wherein, The direction in which the liquid taking needle enters and exits the cleaning chamber is consistent; the cleaning chamber is further adapted to serve as a needle entry channel of the liquid taking needle.

6. The cleaning unit of claim 5, wherein, A gas needle channel is further formed in the cleaning cavity and is independent of the cleaning chamber; the gas needle channel is arranged in parallel with the needle entry channel and is adapted to allow a gas needle to enter and exit.

7. A liquid taking device comprising the cleaning unit according to any one of claims 1 to 6, characterized in that The liquid taking device is used to extract liquid in a container; the container comprises a container port and a plug arranged at the container port; the liquid taking needle is adapted to pierce the plug and extract liquid in the container.

8. The liquid retrieval device of claim 7, wherein, A washing liquid pipeline, a washing liquid pump and a washing liquid tank are further connected in sequence with the cleaning chamber; the washing liquid tank is adapted to contain washing liquid; the washing liquid pump is adapted to deliver the washing liquid to the cleaning chamber through the washing liquid pipeline.

9. The liquid retrieval device of claim 7, wherein, A liquid output pipeline is further in communication with the liquid taking needle; the liquid output pipeline is adapted to output liquid extracted by the liquid taking needle or cleaning liquid used to clean the liquid taking needle to the outside.

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