Drainage device

Abstract

The application discloses a kind of liquid discharge devices, it is arranged in the bottom of tank, the liquid discharge device includes: fixed tube is fixedly arranged below the tank;First telescopic pipe is worn the fixed tube, first piston component is formed on the first telescopic pipe, first piston component divides the inner portion of the fixed tube into first upper chamber and first lower chamber, first upper fluid passage and first lower fluid passage are opened in the fixed tube respectively with first upper chamber and first lower chamber communication;Drive first telescopic pipe to move upward or downward by the first lower fluid passage into first lower chamber into pressure fluid or by the first upper fluid passage into first upper chamber into pressure fluid to adjust telescopic amount relative to the fixed tube;The first telescopic pipe is used to directly or indirectly discharge supernatant in the tank from tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of traditional Chinese medicine preparation, and particularly relates to a liquid discharging device for discharging supernatant of traditional Chinese medicine from a medicine tank. BACKGROUND

[0002] In the prior art, the following process exists in the preparation of traditional Chinese medicine:

[0003] The traditional Chinese medicine materials are placed in a tank body, and then the traditional Chinese medicine materials are stirred in the tank body, and then the tank body is allowed to stand, so that the supernatant is formed in the tank body, and the supernatant is pumped by a suction pipe arranged at the top of the tank body and extending into the tank body, so as to prepare the traditional Chinese medicine by using the supernatant.

[0004] However, due to the different liquid levels of the interface between the supernatant and the residual material in the tank body caused by different types of traditional Chinese medicine raw materials, different amounts of traditional Chinese medicine raw materials and other working conditions, different lengths of the suction pipe need to be selected for pumping according to different interface liquid levels in order to maximize the pumping of the supernatant and avoid pumping the residual material, which inevitably leads to the need to frequently replace the suction pipe of different lengths, thereby causing complicated operation and reducing the efficiency of traditional Chinese medicine preparation. SUMMARY

[0005] In view of the above technical problems existing in the prior art, the embodiments of the present application provide a liquid discharging device.

[0006] To solve the above technical problems, the technical scheme adopted by the embodiments of the present application is as follows:

[0007] A liquid discharging device is arranged at the bottom of a tank body, and the liquid discharging device comprises:

[0008] A fixed pipe is fixedly arranged below the tank body;

[0009] A first telescopic pipe is arranged through the fixed pipe, a first piston part is formed on the first telescopic pipe, the first piston part divides the inside of the fixed pipe into a first upper chamber and a first lower chamber, a first upper fluid passage and a first lower fluid passage are arranged on the fixed pipe and communicate with the first upper chamber and the first lower chamber, respectively, and the first telescopic pipe is driven to move upward or downward to adjust the telescopic amount relative to the fixed pipe by introducing pressure fluid into the first lower chamber through the first lower fluid passage or introducing pressure fluid into the first upper chamber through the first upper fluid passage; wherein:

[0010] The first telescopic pipe is used to directly or indirectly discharge the supernatant in the tank body from the tank body.

[0011] Preferably, the liquid discharging device further comprises a second telescopic tube, the second telescopic tube is arranged in the first telescopic tube, a second piston component is arranged on the second telescopic tube, the second piston component divides the inner part of the first telescopic tube into a second upper chamber and a second lower chamber, a second upper fluid channel and a second lower fluid channel are arranged on the tube wall of the second telescopic tube and are communicated with the second upper chamber and the second lower chamber respectively; the second telescopic tube is driven to move upward or downward to adjust the telescopic amount relative to the first telescopic tube by introducing pressure fluid into the second lower chamber through the second lower fluid channel or by introducing pressure fluid into the second upper chamber through the second upper fluid channel; wherein:

[0012] The second telescopic tube is used for directly discharging the supernatant in the tank body out of the tank body.

[0013] Preferably, a first valve component is arranged above the second telescopic tube, the first valve component is used for controlling the on-off of the second telescopic tube.

[0014] Preferably, the first valve component comprises:

[0015] A first valve pipe, a valve port is arranged on the upper end of the first valve pipe;

[0016] A first valve core is arranged in the first valve pipe and blocks the valve port by moving upward; wherein:

[0017] A third piston component is arranged on the first valve core, the third piston component divides the inner part of the first valve pipe into a third upper chamber and a third lower chamber;

[0018] A third upper fluid channel and a third lower fluid channel are arranged on the tube wall of the first valve pipe and are communicated with the third upper chamber and the third lower chamber respectively;

[0019] The first valve core is driven to move downward or upward to open or close the valve port by introducing pressure fluid into the third upper chamber through the third upper fluid channel or by introducing pressure fluid into the third lower chamber through the third lower fluid channel.

[0020] Preferably, a second valve component is arranged between the first valve component and the second telescopic tube; the second valve component is used for making the liquid in the tank body flow into the second telescopic tube through the second valve component.

[0021] Preferably, the second valve component comprises:

[0022] A second valve pipe, a drain hole is arranged on the tube wall of the lower part of the second valve pipe, a valve seat is arranged on the lower part of the inner hole of the second valve pipe;

[0023] A second valve core in a tubular shape is arranged in the second valve pipe; wherein:

[0024] A fourth valve part is formed on the outer periphery of the upper part of the second valve core, which divides the inner part of the second valve pipe into a fourth upper chamber and a fourth lower chamber;

[0025] Fourth upper and lower fluid passages are formed on the pipe wall of the second valve pipe and communicate with the fourth upper and lower chambers respectively;

[0026] The second valve core is driven to move downward or upward by introducing pressure fluid into the fourth upper chamber through the fourth upper fluid passage or into the fourth lower chamber through the fourth lower fluid passage, so that the lower end of the second valve core abuts against the valve seat to block the drain hole or the lower end of the second valve core is away from the valve seat to open the drain hole.

[0027] Preferably, a first spring is arranged in the first valve pipe for pushing the first valve core upward.

[0028] Preferably, a second spring is arranged in the second valve pipe for pushing the second valve core downward.

[0029] Preferably, a cleaning ball is arranged above the first valve part.

[0030] Compared with the prior art, the beneficial effects of the liquid discharge device disclosed in the present application are:

[0031] 1. The telescopic pipe is driven to extend or retract by pressure fluid to adjust the extension or retraction amount of the telescopic pipe to adapt to the discharge of supernatant with different liquid levels, which not only can discharge the supernatant out of the tank to the greatest extent, but also is simple to operate.

[0032] 2. The liquid discharge device can not only be used to discharge supernatant, but also can be used to discharge other liquids, and can also be used to supply other liquids into the tank for other purposes, for example, supplying cleaning liquid into the tank through the liquid discharge device for cleaning the tank, and for another example, discharging used cleaning liquid from the tank through the liquid discharge device.

[0033] 3. The liquid (such as cleaning liquid) to be discharged can be emptied from the tank to a greater extent by opening the second valve part.

[0034] 4. By constructing fluid chambers (such as the first chamber, the second chamber, the third chamber, and the fourth chamber) and driving the related parts to act by using the pressure fluid supplied into the fluid chambers, compared with the mechanical driving mode, the structure is more compact and the cleanliness is better.

[0035] The overview of various implementations or examples of the technology described in this invention is not a complete disclosure of the full scope or all features of the disclosed technology. Attached Figure Description

[0036] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with or without letter suffixes may indicate different instances of similar parts. The drawings generally illustrate various embodiments by way of example rather than limitation and, together with the description and claims, serve to explain embodiments of the invention. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0037] Figure 1 This is an installation view of the draining device and tank provided for an embodiment of the present invention.

[0038] Figure 2 This is a front sectional view of the drainage device provided in an embodiment of the present invention.

[0039] Figure 3 This is a front sectional view of the cooperation between the first telescopic tube and the second telescopic tube in the drainage device provided in an embodiment of the present invention.

[0040] Figure 4 A front sectional view of the first valve component in the drainage device provided for an embodiment of the present invention (the first valve component is in the closed state).

[0041] Figure 5 A front sectional view of the first valve component in the drainage device provided for an embodiment of the present invention (the first valve component is in the open state).

[0042] Figure 6 A front sectional view of the second valve component in the drainage device provided for an embodiment of the present invention (the first valve component is in the closed state).

[0043] Figure 7 A front sectional view of the second valve component in the drainage device provided for an embodiment of the present invention (the first valve component is in the open state).

[0044] Figure label:

[0045] 10-Fixed pipe; 11-First upper chamber; 12-First lower chamber; 13-First upper fluid channel; 14-First lower fluid channel; 15-Flange; 20-First telescopic pipe; 21-Second upper chamber; 22-Second lower chamber; 23-First piston assembly; 30-Second telescopic pipe; 31-Second upper fluid channel; 32-Second lower fluid channel; 33-Second piston assembly; 40-First valve assembly; 41-First valve pipe; 411-Third upper chamber; 412-Third lower chamber; 413-Third upper fluid channel 414-Third lower fluid channel; 415-Valve port; 42-First valve core; 421-Third piston assembly; 422-Guide hole; 43-First spring; 50-Second valve assembly; 51-Second valve tube; 511-Fourth upper chamber; 512-Fourth lower chamber; 513-Fourth upper fluid channel; 514-Fourth lower fluid channel; 515-Drain hole; 516-Valve seat; 52-Second valve core; 521-Fourth piston assembly; 53-Second spring; 60-Cleaning ball; 100-Tank body; 101-Tank bottom. Detailed Implementation

[0046] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0047] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0048] like Figure 1 and Figure 2 As shown, an embodiment of the present invention discloses a draining device, which is installed at the bottom of the tank 100 to drain the supernatant inside the tank 100 and to supply liquid into the tank 100 for cleaning the tank 100.

[0049] like Figure 2 and Figure 3As shown, the liquid draining device comprises a fixed tube 10, a first telescopic tube 20, a second telescopic tube 30, a first valve component 40, a second valve component 50 and a cleaning ball 60.

[0050] A flange 15 is formed on the upper end of the fixed tube 10, and the flange 15 is fixed to the bottom 101 of the tank body 100 so that the fixed tube 10 is located below the tank body 100. The first telescopic tube 20 is inserted into the fixed tube 10, and a first piston component 23 is formed on the outer periphery of the lower end of the first telescopic tube 20, which divides the inside of the fixed tube 10 into a first upper chamber 11 and a first lower chamber 12. The bottom of the fixed tube 10 is closed, and a radial first upper fluid passage 13 is formed on the tube wall of the upper portion of the fixed tube 10. An axial first lower fluid passage 14 is formed on the bottom of the fixed tube 10, and the first upper fluid passage 13 and the first lower fluid passage 14 are connected to an external water pump (not shown) through a hydraulic control pipeline. A reversing valve installed on the hydraulic control pipeline is used to make the water pump alternately pass through the first lower fluid passage 14 and the first upper fluid passage 13 to supply pressure fluid (such as pure water) to the first lower chamber 12 and the first upper chamber 11. When the pressure fluid is supplied to the first lower chamber 12, the fluid in the first upper chamber 11 is adaptively drained, and the pressure fluid in the first lower chamber 12 pushes against the first piston component 23 upward to drive the first telescopic tube 20 to move upward. When the pressure fluid is supplied to the first upper chamber 11, the fluid in the first lower chamber 12 is adaptively drained, and the pressure fluid in the first upper chamber 11 pushes against the second piston component 33 downward to drive the first telescopic tube 20 to move downward.

[0051] A second telescopic tube 30 is provided, the lower end of the second telescopic tube 30 is connected with the water pipe, and a second piston component 33 is formed on the outer periphery of the second telescopic tube 30, which divides the inner part of the first telescopic tube 20 into a second upper chamber 21 and a second lower chamber 22. The tube wall of the second telescopic tube 30 is provided with a second upper fluid passage 31 and a second lower fluid passage 32, the upper end of the second upper fluid passage 31 penetrates to the second upper chamber 21, the upper end of the second lower fluid passage 32 penetrates to the second lower chamber 22, and the lower end of the second upper fluid passage 31 and the lower end of the second lower fluid passage 32 penetrate to the lower part of the second telescopic tube 30 so as to be connected with the hydraulic control pipe, which is connected with the external water pump. The water pump is used to alternately pass the second lower fluid passage 32 and the second upper fluid passage 31 to supply the pressure fluid (such as pure water) into the second lower chamber 22 and the second upper chamber 21 by using the reversing valve provided on the hydraulic control pipe, when the pressure fluid is supplied into the second lower chamber 22, the fluid in the second upper chamber 21 is adaptively discharged, the pressure fluid in the second lower chamber 22 pushes upwardly against the second piston component 33 to drive the second telescopic tube 30 to move upwardly, and when the pressure fluid is supplied into the second upper chamber 21, the fluid in the second lower chamber 22 is adaptively discharged, the pressure fluid in the second upper chamber 21 pushes downwardly against the second piston component 33 to drive the second telescopic tube 30 to move downwardly.

[0052] It should be noted that the water pump for supplying the pressure fluid into the first chamber (including the first upper chamber 11 and the first lower chamber 12) and the water pump for supplying the pressure fluid into the second chamber (including the second upper chamber 21 and the second lower chamber 22) can be different water pumps or the same water pump, if the same water pump is used, two reversing valves can be used to control the supply of the pressure fluid into the first chamber and the second chamber respectively, and the water pump is only used as a power source.

[0053] Based on the above, the telescopic amount of the second telescopic tube 30 can be controlled by the telescopic amount of the second telescopic tube 30 itself and the telescopic amount of the first telescopic tube 20, that is, the first telescopic tube 20 and the second telescopic tube 30 are configured as a two-stage telescopic mechanism. The two-stage telescopic mechanism can adapt to the interface of different liquid levels, and thus the supernatant of different lower liquid levels can be discharged out of the tank 100 through the second telescopic tube 30.

[0054] As shown in FIG. 1, Figure 2 The second valve component 50 is connected to the upper end of the second telescopic tube 30, the first valve component 40 is connected to the upper end of the first valve component 40, and the cleaning ball 60 is connected to the upper end of the first valve component 40. The second valve component 50 is a constant-through valve, that is, the first valve component 40 is always in communication with the second telescopic tube 30, and the first valve component 40 is used to control the on-off of the second telescopic tube 30.

[0055] As shown in FIG. 1, Figure 4 and Figure 5As shown, the first valve member 40 comprises a first valve tube 41, a first spool 42 and a first spring 43. The first valve tube 41 has a valve port 415 formed in the upper portion of its inner hole. The first spool 42 is arranged in the first valve tube 41 and can move axially along the first valve tube 41. The first spool 42 is configured as a tubular structure with a closed head. The first spool 42 blocks the valve port 415 by moving upward to the highest position, and opens the valve port 415 by moving downward. When the valve port 415 is opened, the valve port 415 can communicate with the lower end of the first valve tube 41 through the flow guide hole 422 formed on the tubular wall of the first spool 42. The first spring 43 is arranged in the first valve tube 41 and is used to push the first spool 42 upward.

[0056] A third piston member 421 is formed on the outer periphery of the first spool 42, which divides the inner portion of the first valve tube 41 into a third upper chamber 411 and a third lower chamber 412. A third upper fluid passage 413 and a third lower fluid passage 414 are formed on the tubular wall of the first valve tube 41. The upper end of the third upper fluid passage 413 penetrates to the third upper chamber 411, and the upper end of the third lower fluid passage 414 penetrates to the third lower chamber 412. In addition, in order to connect the hydraulic control pipeline to the outside of the tank 100, the lower ends of the third upper fluid passage 413 and the third lower fluid passage 414 extend to the lower portion of the second telescopic tube 30, thereby facilitating the connection of the hydraulic control pipeline. The lower end of the third upper fluid passage 413 and the lower end of the third lower fluid passage 414 are connected to the water pump through the hydraulic control pipeline, and a reversing valve is arranged on the hydraulic control pipeline. The water pump can alternately supply pressure fluid to the third upper chamber 411 and the third lower chamber 412 through the reversing valve.

[0057] As shown, Figure 5 When pressure fluid is supplied to the third upper chamber 411, the fluid in the third lower chamber 412 is adaptively discharged, and the pressure fluid in the third upper chamber 411 pushes against the third piston member 421 to drive the first spool 42 to move downward to open the valve port 415, thereby making the inside of the tank 100 communicate with the second telescopic tube 30. After the second telescopic tube 30 is opened, the supernatant in the tank 100 can be discharged through the second telescopic tube 30, or other fluid can be supplied into the tank 100 through the second telescopic tube 30. The other fluid can be a fluid used for stirring to ultimately obtain the supernatant, or can be a cleaning fluid used for cleaning.

[0058] As shown, Figure 4As shown, when pressurized fluid is supplied to the third lower chamber 412, the fluid in the third upper chamber 411 is adaptively discharged, and the pressurized fluid in the third lower chamber 412 pushes against the third piston component 421 to drive the first valve core 42 to move upward and close the valve port 415, thereby closing the second telescopic tube 30, so that the liquid in the tank 100 is kept in the tank 100. For example, it is used to keep the liquid in the tank 100 when the material in the tank 100 is stirred and settled.

[0059] In the first valve component 40, the first spring 43 is used to assist the pressurized fluid in pushing the first valve core 42 upward so that the first valve core 42 can more stably block the valve port 415.

[0060] like Figure 6 and Figure 7 As shown, the second valve component 50 includes a second valve tube 51, a second valve core 52, and a second spring 53. A stepped valve seat 516 is formed at the lower part of the inner bore of the first valve tube 41, and a drain hole 515 is provided on the tube wall above the valve seat 516. The second valve core 52 is a tubular structure extending vertically, and is disposed within the second valve tube 51. The second spring 53 is used to push the second valve core 52 downwards. A fourth piston component 521 is formed on the outer periphery of the second valve core 52. This fourth piston component 521 divides the interior of the second valve tube 51 into a fourth upper chamber 511 and a fourth lower chamber 512. A fourth upper fluid channel 513 and a fourth lower fluid channel 514 are provided on the tube wall of the second valve tube 51. The upper end of the fourth upper fluid channel 513 extends into the fourth upper chamber 511, and the upper end of the fourth lower fluid channel 514 extends into the fourth lower chamber 512. In addition, to facilitate the connection of the hydraulic control line to the outside of the tank 100, the lower ends of the fourth upper fluid channel 513 and the fourth lower fluid channel 514 extend to the lower part of the second telescopic pipe 30 for easy connection of the hydraulic control line. The lower ends of the fourth upper fluid channel 513 and the fourth lower fluid channel 514 are connected to the water pump via the hydraulic control line, and a reversing valve is installed on the hydraulic control line. The water pump, controlled by the reversing valve, can alternately supply pressurized fluid to the fourth upper chamber 511 and the fourth lower chamber 512.

[0061] It should be noted that the water pump used to supply pressurized fluid to the third chamber (including the third upper chamber 411 and the third lower chamber 412) and the fourth chamber (including the fourth upper chamber 511 and the fourth lower chamber 512) can be different from the water pump used to supply pressurized fluid to the first chamber and the second chamber, or it can be the same water pump. If it is the same water pump, different reversing valves can be used to control the supply of pressurized fluid to the third chamber and the fourth chamber, and the water pump only serves as a power source.

[0062] like Figure 6As shown, when pressure fluid is supplied to the fourth upper chamber 511, the fluid in the fourth lower chamber 512 is adaptively discharged, the pressure fluid in the fourth upper chamber 511 pushes against the fourth piston component 521 to drive the second spool 52 to move downward so that the lower end of the second spool 52 abuts against the valve seat 516 for closing the drain hole 515. At this time, the second valve component 50 only serves as a connecting pipe.

[0063] As shown, when pressure fluid is supplied to the fourth upper chamber 511, the fluid in the fourth lower chamber 512 is adaptively discharged, the pressure fluid in the fourth upper chamber 511 pushes against the fourth piston component 521 to drive the second spool 52 to move downward so that the lower end of the second spool 52 abuts against the valve seat 516 for closing the drain hole 515. At this time, the second valve component 50 only serves as a connecting pipe. Figure 7 As shown, when pressure fluid is supplied to the fourth upper chamber 511, the fluid in the fourth lower chamber 512 is adaptively discharged, the pressure fluid in the fourth upper chamber 511 pushes against the fourth piston component 521 to drive the second spool 52 to move downward so that the lower end of the second spool 52 abuts against the valve seat 516 for closing the drain hole 515. At this time, the second valve component 50 only serves as a connecting pipe.

[0064] In the second valve component 50, the second spring 53 is used to assist the pressure fluid to push downward against the second spool 52 so that the second spool 52 more stably closes the drain hole 515.

[0065] The cleaning ball 60 is arranged at the upper end of the first valve component 40, and the cleaning ball 60 can be arranged with through holes on its surface so that liquid enters the tank 100 in a jetting manner.

[0066] The key advantage of the liquid draining device provided by the present application is that:

[0067] 1. The pressure fluid is used to drive the telescopic pipe to telescope so as to adjust the telescopic amount of the telescopic pipe to adapt to draining supernatant with different liquid levels, which not only can drain the supernatant out of the tank 100 to the greatest extent, but also is simple to operate.

[0068] 2. The liquid draining device can not only be used to drain supernatant, but also can be used to drain other liquids, and can also be used to supply other liquids into the tank 100 for other purposes, for example, supplying cleaning liquid into the tank 100 through the liquid draining device for cleaning the tank 100, and for example, draining the used cleaning liquid out of the tank 100 through the liquid draining device.

[0069] 3. The second valve component 50 is opened to drain the liquid (such as cleaning liquid) to be drained out of the tank 100 to a greater extent.

[0070] 4. By constructing fluid chambers (e.g., first chamber, second chamber, third chamber, and fourth chamber) and using the pressure fluid supplied to the fluid chambers to drive the relevant components, the structure is more compact and cleaner compared to mechanical drive methods.

[0071] Furthermore, although exemplary embodiments have been described in this invention, their scope includes any and all embodiments based on the invention that have equivalent elements, modifications, omissions, combinations (e.g., schemes involving intersections of various embodiments), adaptations, or alterations. Elements in the claims will be interpreted broadly based on the language used in the claims and are not limited to the examples described in this specification or during the implementation of this application, and such examples will be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered illustrative only, and the true scope and spirit are indicated by the full scope of the following claims and their equivalents.

[0072] The above description is intended to be illustrative and not restrictive. For example, the above examples (or one or more of them) can be used in combination with each other. Other embodiments may be used by those skilled in the art upon reading the above description. Furthermore, in the above detailed description, various features may be grouped together to simplify the invention. This should not be construed as an intention that a disclosed feature, which is not claimed, is necessary for any claim. Rather, the subject matter of the invention may be less than all the features of the particular disclosed embodiment. Thus, the following claims are incorporated herein by reference as examples or embodiments, wherein each claim is independently considered as a separate embodiment, and these embodiments are contemplated as being possible in various combinations or arrangements. The scope of the invention should be determined by reference to the appended claims and the full scope of their equivalents.

[0073] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A drainage device, characterized in that, The liquid discharging device is arranged at the bottom of the tank body, and comprises: a fixed tube arranged below the tank body; a first telescopic tube penetrating the fixed tube, a first piston part being formed on the first telescopic tube, the first piston part dividing the inside of the fixed tube into a first upper chamber and a first lower chamber, a first upper fluid passage and a first lower fluid passage being formed on the fixed tube and communicating with the first upper chamber and the first lower chamber respectively, the first telescopic tube being driven to move upward or downward to adjust the telescopic amount relative to the fixed tube by introducing pressure fluid into the first lower chamber through the first lower fluid passage or by introducing pressure fluid into the first upper chamber through the first upper fluid passage; wherein: the first telescopic tube is used for indirectly discharging supernatant in the tank body out of the tank body; the liquid discharging device further comprises a second telescopic tube penetrating the first telescopic tube, a second piston part being formed on the second telescopic tube, the second piston part dividing the inside of the first telescopic tube into a second upper chamber and a second lower chamber, a second upper fluid passage and a second lower fluid passage being formed on the tube wall of the second telescopic tube and communicating with the second upper chamber and the second lower chamber respectively, the second telescopic tube being driven to move upward or downward to adjust the telescopic amount relative to the first telescopic tube by introducing pressure fluid into the second lower chamber through the second lower fluid passage or by introducing pressure fluid into the second upper chamber through the second upper fluid passage; wherein: the second telescopic tube is used for directly discharging supernatant in the tank body out of the tank body; a first valve part is arranged above the second telescopic tube, the first valve part being used for controlling the on-off of the second telescopic tube; the first valve part comprises: a first valve tube, an upper end of the first valve tube being formed with a valve port; a first valve core arranged in the first valve tube and sealing the valve port by moving upward; wherein: a third piston part is formed on the first valve core, the third piston part dividing the inside of the first valve tube into a third upper chamber and a third lower chamber; a third upper fluid passage and a third lower fluid passage are formed on the tube wall of the first valve tube and communicating with the third upper chamber and the third lower chamber respectively; the first valve core is driven to move downward or upward to open or close the valve port by introducing pressure fluid into the third upper chamber through the third upper fluid passage or by introducing pressure fluid into the third lower chamber through the third lower fluid passage; a second valve part is arranged between the first valve part and the second telescopic tube, the second valve part being used for making liquid in the tank body flow into the second telescopic tube through the second valve part; the second valve part comprises: a second valve tube, a tube wall of a lower part of the second valve tube being formed with a flow hole, a valve seat being formed on a lower part of the inner hole of the second valve tube; a second valve core in the shape of a tube, the second valve core being arranged in the second valve tube; wherein: a fourth valve part is formed on the outer periphery of an upper part of the second valve core, the fourth valve part dividing the inside of the second valve tube into a fourth upper chamber and a fourth lower chamber; A fourth upper fluid passage and a fourth lower fluid passage are formed in the wall of the second valve tube and communicate with the fourth upper chamber and the fourth lower chamber, respectively; The second spool is driven to move downward or upward by introducing pressure fluid into the fourth upper chamber through the fourth upper fluid passage or into the fourth lower chamber through the fourth lower fluid passage, so that the lower end of the second spool abuts against the valve seat to block the drain hole or the lower end of the second spool is away from the valve seat to open the drain hole.

2. The drainage device according to claim 1, characterized in that A first spring is arranged in the first valve tube and used to push the first spool upward.

3. The drainage device according to claim 1, wherein A second spring is arranged in the second valve tube and used to push the second spool downward.

4. The drainage device according to claim 1, wherein A cleaning ball is arranged above the first valve member.

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