Liquid drainage structure of liquid storage tank

Abstract

The utility model provides a liquid discharge structure of a liquid storage tank, which comprises a liquid storage tank body and a liquid discharge switch mechanism, and a liquid storage space and a mounting port are arranged in the liquid storage tank body; the liquid drainage switch mechanism comprises a liquid drainage mounting assembly, a pressing piece and an elastic locking assembly, the liquid drainage mounting assembly is arranged in the mounting opening, a liquid drainage opening is formed in the end, close to the outside, of the liquid drainage mounting assembly, a liquid drainage space is formed in the liquid drainage mounting assembly, and the liquid storage space, the liquid drainage space and the liquid drainage opening are communicated and form a liquid drainage channel; the pressing piece penetrates through the liquid discharging opening and is movably and adjustably arranged in the liquid discharging space, the pressing piece has a first state for opening the liquid discharging opening and a second state for blocking the liquid discharging opening, and the elastic locking assembly is connected between the pressing piece and the liquid discharging installation assembly; the elastic locking assembly is driven to act by driving the pressing piece to move, so that the elastic locking assembly locks the pressing piece in the first state or the second state. The utility model has the characteristic that the drainage operation is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of automotive parts technology, and in particular to a drain structure for a liquid reservoir. Background Technology

[0002] To protect the environment, countries around the world have successively introduced exhaust emission standards and regulations. Increasingly stringent emission regulations make it difficult for simple in-engine purification technologies to meet the requirements, necessitating the use of external after-treatment technologies. Currently, major domestic automakers primarily use SCR (Selective Catalytic Reduction) technology to control nitrogen oxide emissions from diesel engines. These products are suitable for pickup trucks, tractors, buses, and other applications.

[0003] In SCR systems, urea tanks are typically used to store urea solution. These tanks usually have a drain mechanism at the bottom to release the urea solution when necessary. Existing urea tank drain mechanisms typically use a drain bolt at the drain port. Drainage is achieved by simply loosening the drain bolt to release any remaining urea solution.

[0004] However, during the urea discharge process, a wrench is required to operate the drain plug. Since the urea tank is typically located at the bottom of the vehicle frame, operating the wrench from there presents inconvenience. Furthermore, the limited operating space makes it easy to misjudge the rotation direction of the drain plug, leading to stripping or damage to the threads due to tightening in the wrong direction. Additionally, the urea tank drain plug sealing structure requires extra auxiliary tools, and because the drain outlet is located at the bottom of the frame, this adds to the cumbersome and inconvenient operation.

[0005] Therefore, it is necessary to provide a liquid storage tank drainage structure that is simple and convenient to operate. Summary of the Invention

[0006] The purpose of this invention is to provide a liquid storage tank drainage structure that is simple and convenient to operate.

[0007] To achieve the above objectives, the present invention provides a liquid storage tank drainage structure, including a liquid storage tank body and a drainage switch mechanism. The liquid storage tank body has a liquid storage space and an installation port communicating with the liquid storage space. The drainage switch mechanism includes a drainage installation component, a pressing component, and an elastic locking component. The drainage installation component is disposed within the installation port, and a drainage port is provided on the end of the drainage installation component near the outside. The drainage installation component has a drainage space inside, and the liquid storage space, the drainage space, and the drainage port are connected to form a drainage channel. The pressing component passes through the drainage port and is movably and adjustablely disposed within the drainage space. The pressing component has a first state of opening the drainage port and a second state of blocking the drainage port. The elastic locking component is connected between the pressing component and the drainage installation component. By driving the pressing component to move, the elastic locking component is activated, so that the elastic locking component locks the pressing component in the first state or the second state.

[0008] Preferably, the elastic locking component includes a movable track member, one end of which is inserted into the drainage mounting component. The pressing member has a movable track groove, and the other end of the movable track member is movably inserted into the movable track groove. The movable track member has a first locking position and a second locking position within the movable track groove. By driving the pressing member to move, the movable track member is moved to the first locking position or the second locking position, thereby locking the pressing member in the first state or the second state.

[0009] Preferably, the movable trajectory groove includes a first groove segment extending from the end away from the drain port toward the drain port and a second groove segment bent from the end of the first groove segment toward the drain port and extending toward the drain port; when the movable trajectory member is engaged at the end of the first groove segment away from the drain port, the movable trajectory member is in the first engaging position; when the movable trajectory member is engaged at the end of the second groove segment away from the drain port, the movable trajectory member is in the second engaging position.

[0010] Preferably, the first groove segment and the second groove segment are symmetrically arranged on the pressing member, and the ends of the two first groove segments away from the drain port are connected, and the ends of the two second groove segments away from the drain port are connected.

[0011] Preferably, the elastic locking assembly further includes an elastic element that abuts against the pressing member and the drain mounting assembly along the moving direction of the pressing member, and the elastic element is used to keep the movable trajectory member in the first locking position or the second locking position.

[0012] Preferably, the drainage installation assembly includes a drainage base and a sleeve. The drainage base is disposed within the installation port, the drainage port and the drainage space are formed on the drainage base, the sleeve is disposed within the drainage space, the sleeve has a guide hole, the pressing member is movably and adjustably inserted into the guide hole, and one end of the movable trajectory member is inserted into the sleeve.

[0013] Preferably, the sidewall of the drainage base is provided with a plurality of openings arranged around the drainage space, the openings connecting the drainage space and the liquid storage space.

[0014] Preferably, one end of the sleeve is located in the drainage space, the other end of the sleeve is located in the liquid storage space, the guide hole communicates with the liquid storage space, and one end of the movable track member passes through the guide hole and is inserted into the end of the sleeve located in the liquid storage space.

[0015] Preferably, the drain switch mechanism further includes an anti-disengagement ring, which is sleeved on the movable track member and the end of the sleeve located in the liquid storage space, and the anti-disengagement ring is used to prevent the movable track member from disengaging from the sleeve.

[0016] Preferably, the drain switch mechanism further includes a limiting pin, the side wall of the sleeve is provided with an insertion hole, the side wall of the pressing member is provided with a limiting groove along its moving direction, and the limiting pin passes through the insertion hole and is inserted into the limiting groove.

[0017] Preferably, the drain switch mechanism further includes a sealing ring, which is sleeved on the pressing member; when the pressing member is in the second state, the sealing ring seals between the outer side wall of the pressing member and the inner side wall of the drain port; when the pressing member is in the first state, the sealing ring disengages from the drain port.

[0018] Compared with the prior art, the liquid discharge switch mechanism of the liquid storage tank discharge structure of this utility model includes a discharge installation component, a pressing component, and an elastic locking component. By driving the pressing component to move, the elastic locking component is activated, locking the pressing component in either the first or second state. When the pressing component is in the first state, it opens the discharge port, connecting it to the outside. This connects the liquid storage space, the discharge space, and the discharge port to the outside, allowing liquid in the liquid storage space to be discharged through this discharge channel. When the pressing component is in the second state, it blocks the discharge port, preventing liquid in the liquid storage space from being discharged through the discharge channel. Therefore, the liquid storage tank discharge structure of this utility model features simple and convenient discharge operation, eliminating the need for additional filling tools, greatly improving the convenience of subsequent maintenance, providing good error prevention, and achieving rapid liquid discharge. Attached Figure Description

[0019] Figure 1 This is a three-dimensional sectional view of the liquid storage tank drainage structure of this utility model when the pressing component is in the first state.

[0020] Figure 2 yes Figure 1 The diagram shows the three-dimensional structure of the drain switch mechanism of the liquid storage tank drain structure when the pressing element is in the first state.

[0021] Figure 3 This is a three-dimensional sectional view of the liquid storage tank drainage structure of this utility model when the pressing component is in the second state.

[0022] Figure 4 yes Figure 2 The diagram shows the three-dimensional structure of the drain switch mechanism of the liquid storage tank drain structure when the pressing element is in the second state.

[0023] Figure 5 This is an exploded view of the liquid discharge switch mechanism of this utility model.

[0024] Figure 6 This is a three-dimensional structural diagram of the pressing component of this utility model.

[0025] Figure 7 This is a partial structural diagram of the liquid discharge switch mechanism of this utility model.

[0026] Figure 8 yes Figure 7 The diagram shown is a three-dimensional representation of the structure after the sleeve is removed.

[0027] Reference numerals in the attached figures: liquid storage tank drainage structure 100, liquid storage tank body 1, liquid storage space 11, mounting port 12, drainage switch mechanism 2, drainage installation assembly 21, drainage base 211, drainage port 211a, drainage space 211b, opening 211c, sleeve 212, guide hole 212a, insertion hole 212b, pressing part 22, moving track groove 221, first groove segment 221a, second groove segment 221b, limiting groove 222, elastic locking assembly 23, moving track part 231, elastic part 232, anti-disengagement ring 24, limiting pin 25, sealing ring 26. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] Please see Figures 1 to 5The liquid storage tank drainage structure 100 of this utility model includes a liquid storage tank body 1 and a drainage switch mechanism 2. The liquid storage tank body 1 has a liquid storage space 11 and an installation port 12 communicating with the liquid storage space 11. The drainage switch mechanism 2 includes a drainage installation component 21, a pressing component 22 and an elastic locking component 23. The drainage installation component 21 is disposed in the installation port 12. The end of the drainage installation component 21 near the outside has a drainage port 211a. The interior of the drainage installation component 21 has a drainage space 211b. The liquid storage space 11 and the drainage port 21 are connected. Space 211b and drain port 211a are connected to form a drain channel; pressing member 22 passes through drain port 211a and is movably and adjustablely disposed in drain space 211b, and pressing member 22 has a first state of opening drain port 211a and a second state of blocking drain port 211a; elastic locking component 23 is connected between pressing member 22 and drain mounting component 21; by driving pressing member 22 to move, the elastic locking component 23 is driven to move, so that the elastic locking component 23 locks pressing member 22 in the first state or the second state.

[0035] like Figure 1 and Figure 2 As shown, the pressing member 22 is in the first state. The pressing member 22 opens the drain port 211a, which is connected to the outside. This allows the drain channel formed by the liquid storage space 11, the drain space 211b, and the drain port 211a to be connected to the outside, so that the liquid in the liquid storage space 11 can be discharged to the outside through the drain channel.

[0036] like Figure 3 and Figure 4 As shown, the pressing member 22 is in the second state, and the pressing member 22 blocks the drain port 211a, thereby preventing the liquid in the liquid storage space 11 from being discharged to the outside through the drain channel.

[0037] Specifically, the liquid referred to in this embodiment can be urea solution, methanol or other fuel liquids, but is not limited thereto.

[0038] When the pressing member 22 is in the first state, if it is necessary to block the drain port 211a, the pressing member 22 of the drain switch mechanism 2 can be pressed to drive the pressing member 22 to move, thereby driving the elastic locking component 23 to act. When the pressing member 22 moves to the position corresponding to the second state, the elastic locking component 23 locks the position of the pressing member 22 to lock the pressing member 22 in the second state, thereby blocking the drain port 211a. When the pressing member 22 is in the second state, if it is necessary to open the drain port 211a, the pressing member 22 of the drain switch mechanism 2 can be pressed again to drive the pressing member 22 to move in the opposite direction, thereby driving the elastic locking component 23 to act. When the pressing member 22 moves to the position corresponding to the first state, the elastic locking component 23 locks the position of the pressing member 22 to lock the pressing member 22 in the first state, thereby opening the drain port 211a.

[0039] The mounting port 12 can be located at the bottom of the liquid storage tank body 1 so that the liquid in the liquid storage space 11 can be discharged through the drainage channel of the drainage switch mechanism 2, but it is not limited thereto. For example, the mounting port 12 can also be located on the side wall of the liquid storage tank body 1.

[0040] Please see Figures 1 to 6 In one embodiment, the elastic locking component 23 includes a movable track member 231. One end of the movable track member 231 is inserted into the drain mounting component 21. The pressing member 22 is provided with a movable track groove 221. The other end of the movable track member 231 is movably inserted into the movable track groove 221. The movable track member 231 has a first locking position and a second locking position in the movable track groove 221. By driving the pressing member 22 to move, the movable track member 231 is moved to the first locking position or the second locking position, thereby locking the pressing member 22 in the first state or the second state. Specifically, the movable track groove 221 includes a first groove segment 221a extending from the end away from the drain port 211a towards the drain port 211a, and a second groove segment 221b extending away from the end of the first groove segment 221a near the drain port 211a. When the movable track member 231 is engaged at the end of the first groove segment 221a away from the drain port 211a, the movable track member 231 is in a first engaging position; when the movable track member 231 is engaged at the end of the second groove segment 221b away from the drain port 211a, the movable track member 231 is in a second engaging position. More specifically, the first groove segment 221a and the second groove segment 221b are symmetrically arranged on the pressing member 22, and the ends of the two first groove segments 221a away from the drain port 211a are connected, and the ends of the two second groove segments 221b away from the drain port 211a are connected, but this is not a limitation.

[0041] Among them, such as Figure 2As shown, the movable trajectory component 231 is engaged at the end of the first groove section 221a away from the drain port 211a. At this time, the movable trajectory component 231 is in the first engaging position, thereby locking the pressing component 22 in the first state; as Figure 4 As shown, the movable trajectory component 231 is engaged at the end of the second groove section 221b away from the drain port 211a. At this time, the movable trajectory component 231 is in the second engagement position, thereby locking the pressing component 22 in the second state.

[0042] Furthermore, the elastic locking assembly 23 also includes an elastic element 232, which abuts against the pressing member 22 and the drain mounting assembly 21 along the moving direction of the pressing member 22. The elastic element 232 is used to keep the movable trajectory member 231 in the first locking position or the second locking position. However, this is not a limitation. For example, in other alternative embodiments, the elastic locking assembly 23 may only have the movable trajectory member 231 without the elastic element 232, and the movable trajectory member 231 may be configured as an elastic structure.

[0043] When the pressing member 22 needs to switch from the first state to the second state, the pressing member 22 of the drain switch mechanism 2 is pressed to drive the pressing member 22 to move. During the movement of the pressing member 22, the pressing member 22 squeezes the elastic member 232. The movable trajectory member 231 first moves from the first locking position along the first groove section 221a, and then at the position where the first groove section 221a and the second groove section 221b are connected, the movable trajectory member 231 moves into the second groove section 221b under the action of the elastic restoring force of the elastic member 232, and finally locks at the end of the second groove section 221b away from the drain port 211a. At this time, the movable trajectory member 231 is in the second locking position and locks the pressing member 22 in the second state, thereby making the pressing member 22 block the drain port 211a. Among them, the drain switch mechanism 2 from Figure 2 The structure shown is switched to Figure 4 The structure shown.

[0044] When the pressing member 22 needs to switch from the second state to the first state, the pressing member 22 of the drain switch mechanism 2 is pressed to drive the pressing member 22 to move. During the movement of the pressing member 22, the pressing member 22 squeezes the elastic member 232. The movable trajectory member 231 first moves from the second locking position along the second groove section 221b, and then at the position where the first groove section 221a and the second groove section 221b are connected, the movable trajectory member 231 moves into the first groove section 221a under the action of the elastic restoring force of the elastic member 232, and finally locks at the end of the first groove section 221a away from the drain port 211a. At this time, the movable trajectory member 231 is in the first locking position and locks the pressing member 22 in the first state, thereby causing the pressing member 22 to open the drain port 211a. Among them, the drain switch mechanism 2 from Figure 4 The structure shown is switched to Figure 2 The structure shown.

[0045] Please see Figure 2 , Figure 4 and Figure 5 In one embodiment, the drainage installation assembly 21 includes a drainage base 211 and a sleeve 212. The drainage base 211 is disposed within the installation port 12, and a drainage port 211a and a drainage space 211b are formed on the drainage base 211. The sleeve 212 is disposed within the drainage space 211b and is fixedly connected to the drainage base 211. The sleeve 212 has a guide hole 212a, and a pressing member 22 is movably and adjustably inserted into the guide hole 212a. One end of the movable trajectory member 231 is inserted into the sleeve 212. Further, the side wall of the drainage base 211 has a plurality of openings 211c arranged around the drainage space 211b, and the openings 211c communicate between the drainage space 211b and the liquid storage space 11.

[0046] Specifically, one end of the sleeve 212 is located in the drain space 211b, and the other end of the sleeve 212 is located in the liquid storage space 11. The guide hole 212a is connected to the liquid storage space 11. One end of the movable track member 231 passes through the guide hole 212a and is inserted into the end of the sleeve 212 located in the liquid storage space 11.

[0047] Furthermore, the drain switch mechanism 2 also includes an anti-disengagement ring 24, which is sleeved on the movable track member 231 and the end of the sleeve 212 located in the liquid storage space 11. The anti-disengagement ring 24 is used to prevent the movable track member 231 from disengaging from the sleeve 212. Since one end of the movable track member 231 is inserted into the end of the sleeve 212 located in the liquid storage space 11, in order to prevent the movable track member 231 from disengaging from the sleeve 212, the anti-disengagement ring 24 is provided to press and limit the end of the movable track member 231 on the sleeve 212, thereby preventing the movable track member 231 from disengaging from the sleeve 212.

[0048] Please see Figure 7 and Figure 8 In one embodiment, the drain switch mechanism 2 further includes a limiting pin 25. The side wall of the sleeve 212 has an insertion hole 212b, and the side wall of the pressing member 22 has a limiting groove 222 along its moving direction. The limiting pin 25 passes through the insertion hole 212b and is inserted into the limiting groove 222. When the pressing member 22 is driven to move relative to the sleeve 212, relative sliding occurs between the limiting groove 222 and the limiting pin 25 on the pressing member 22. Under the action of the limiting pin 25 and the limiting groove 222, the moving distance of the pressing member 22 can be limited.

[0049] Please see Figure 2 , Figure 4 and Figure 5In one embodiment, the drain switch mechanism 2 further includes a sealing ring 26, which is sleeved on the pressing member 22. When the pressing member 22 is in the second state, the sealing ring 26 seals between the outer wall of the pressing member 22 and the inner wall of the drain port 211a, thereby improving the sealing performance of the pressing member 22 when blocking the drain port 211a. When the pressing member 22 is in the first state, the sealing ring 26 is disengaged from the drain port 211a.

[0050] Combination Figures 1 to 8 The specific working principle of the liquid storage tank drainage structure 100 of this utility model is as follows:

[0051] When the pressing member 22 is in the first state, pressing the pressing member 22 drives it to move. During the movement of the pressing member 22, the pressing member 22 squeezes the elastic member 232. The movable trajectory member 231 first moves from the first locking position along the first groove segment 221a on the left or right side. Then, at the position where the first groove segment 221a and the second groove segment 221b are connected, the movable trajectory member 231 moves into the corresponding second groove segment 221b under the action of the elastic restoring force of the elastic member 232. Finally, it is locked at the end of the second groove segment 221b away from the drain port 211a. At this time, the movable trajectory member 231 is in the second locking position and locks the pressing member 22 in the second state, thereby blocking the drain port 211a and preventing the liquid in the liquid storage space 11 from being discharged to the outside through the drain channel.

[0052] When the pressing member 22 is in the first state, pressing the pressing member 22 drives it to move. During the movement of the pressing member 22, the pressing member 22 squeezes the elastic member 232. The movable trajectory member 231 first moves from the second locking position along the second groove segment 221b on the left or right side. Then, at the position where the second groove segment 221b connects with the first groove segment 221a, the movable trajectory member 231 moves into the corresponding first groove segment 221a under the action of the elastic restoring force of the elastic member 232. Finally, it is locked at the end of the first groove segment 221a away from the drain port 211a. At this time, the movable trajectory member 231 is in the first locking position and locks the pressing member 22 in the first state, thereby opening the drain port 211a. This allows the drain channel formed by the liquid storage space 11, the drain space 211b, and the drain port 211a to connect with the outside. At this time, the liquid in the liquid storage space 11 can be discharged to the outside through the drain channel.

[0053] In summary, the liquid storage tank drainage structure 100 of this utility model features simple and convenient drainage operation, requiring no additional filling auxiliary tools, greatly improving the convenience of subsequent maintenance, and providing good error-proofing while achieving rapid liquid drainage. Secondly, the drainage switch mechanism 2 of the liquid storage tank drainage structure 100 of this utility model adopts a press-and-rebound reciprocating structure with a built-in anti-disengagement pressure ring, ensuring smooth and stable operation of the mechanism and effectively improving the service life of the drainage switch mechanism 2.

[0054] The above-disclosed embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, any equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A liquid storage tank drainage structure, characterized in that, include: The liquid storage tank body has a liquid storage space and an installation port communicating with the liquid storage space. A drain switch mechanism includes a drain mounting assembly, a pressing member, and an elastic locking assembly. The drain mounting assembly is disposed within the mounting port, and a drain outlet is provided on the end of the drain mounting assembly near the outside. The drain mounting assembly has a drain space inside, and the liquid storage space, the drain space, and the drain outlet are connected to form a drain channel. The pressing member passes through the drain outlet and is movably and adjustablely disposed within the drain space. The pressing member has a first state of opening the drain outlet and a second state of blocking the drain outlet. The elastic locking assembly is connected between the pressing member and the drain mounting assembly. By driving the pressing member to move, the elastic locking assembly is activated, causing the elastic locking assembly to lock the pressing member in the first state or the second state.

2. The liquid storage tank drainage structure according to claim 1, characterized in that, The elastic locking component includes a movable track member, one end of which is inserted into the drainage mounting component. The pressing member has a movable track groove, and the other end of the movable track member is movably inserted into the movable track groove. The movable track member has a first locking position and a second locking position within the movable track groove. By driving the pressing member to move, the movable track member is moved to the first locking position or the second locking position, thereby locking the pressing member in the first state or the second state.

3. The liquid storage tank drainage structure according to claim 2, characterized in that, The movable trajectory groove includes a first groove segment extending from the end away from the drain outlet toward the drain outlet and a second groove segment bent from the end of the first groove segment toward the drain outlet and extending toward the drain outlet; when the movable trajectory member is engaged at the end of the first groove segment away from the drain outlet, the movable trajectory member is in the first engaging position; when the movable trajectory member is engaged at the end of the second groove segment away from the drain outlet, the movable trajectory member is in the second engaging position.

4. The liquid storage tank drainage structure according to claim 3, characterized in that, The first groove segment and the second groove segment are symmetrically arranged on the pressing member, and the ends of the two first groove segments away from the drain port are connected, and the ends of the two second groove segments away from the drain port are connected.

5. The liquid storage tank drainage structure according to claim 2, characterized in that, The elastic locking assembly further includes an elastic element, which abuts against the pressing member and the drain mounting assembly along the moving direction of the pressing member. The elastic element is used to keep the movable trajectory member in the first locking position or the second locking position.

6. The liquid storage tank drainage structure according to claim 2, characterized in that, The drainage installation assembly includes a drainage base and a sleeve. The drainage base is disposed in the installation port, the drainage port and the drainage space are formed on the drainage base, the sleeve is disposed in the drainage space, the sleeve is provided with a guide hole, the pressing member is movably and adjustably inserted into the guide hole, and one end of the movable trajectory member is inserted into the sleeve.

7. The liquid storage tank drainage structure according to claim 6, characterized in that, The sidewall of the drainage base is provided with a plurality of openings arranged around the drainage space, and the openings connect the drainage space and the liquid storage space.

8. The liquid storage tank drainage structure according to claim 6, characterized in that, One end of the sleeve is located in the drainage space, and the other end of the sleeve is located in the liquid storage space. The guide hole communicates with the liquid storage space, and one end of the movable track member passes through the guide hole and is inserted into the end of the sleeve located in the liquid storage space.

9. The liquid storage tank drainage structure according to claim 8, characterized in that, The drain switch mechanism also includes an anti-disengagement ring, which is sleeved on the movable track member and the end of the sleeve located in the liquid storage space. The anti-disengagement ring is used to prevent the movable track member from disengaging from the sleeve.

10. The liquid storage tank drainage structure according to claim 6, characterized in that, The drain switch mechanism also includes a limiting pin. The side wall of the sleeve is provided with an insertion hole, and the side wall of the pressing member is provided with a limiting groove along its moving direction. The limiting pin passes through the insertion hole and is inserted into the limiting groove.

11. The liquid storage tank drainage structure according to claim 1, characterized in that, The drain switch mechanism further includes a sealing ring, which is sleeved on the pressing member; when the pressing member is in the second state, the sealing ring seals between the outer wall of the pressing member and the inner wall of the drain port; when the pressing member is in the first state, the sealing ring disengages from the drain port.

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