Storage tank

Abstract

The utility model discloses a storage tank, which comprises a tank body, a storage tank cover, a storage tank cover and a storage tank cover, a mounting hole communicated with the accommodating cavity is formed in the bottom of the tank body; the connector is arranged at the mounting hole of the tank body and downwards extends out of the tank body, the interior of the connector is hollow to form a through liquid collecting channel, and the liquid collecting channel is communicated with the containing cavity; the sealing structure is detachably arranged on the connector, the sealing structure is configured to be capable of sealing or opening the liquid collecting channel, and the inner circumferential wall of the connector and the sealing structure jointly define a liquid collecting groove with an opening facing the containing cavity; the pipe fitting is arranged on the tank body, at least part of the pipe fitting is located in the containing cavity, and the lower end of the pipe fitting stretches into the liquid collecting groove. Through detachable matching arrangement between the connector and the sealing structure, the storage tank can have the liquid collecting function and the sewage discharging function at the same time, the number of functional holes formed in the tank body is reduced, the structural strength of the tank body is guaranteed, and functional layout of the storage tank is facilitated; interference is reduced, the practicability is high, the structure is simple, machining is easy, and the production cost is low.

Description

Technical Field

[0001] The present application relates to the field of containers, and in particular to a storage tank. Background Art

[0002] To meet current logistics packaging needs, metal containers are widely used due to their versatility, strength, ease of cleaning, and reusability. Vertical or horizontal tank structures require numerous functional holes, such as sump tanks for collecting liquids, drain outlets for flushing wastewater, and pressure gauges for measuring pressure. However, excessive holes can significantly weaken the overall strength of the tank shell. In some containers, excessive holes can interfere with internal and external piping connections, impacting layout. Utility Model Content

[0003] In order to solve the above problems, the present application provides a storage tank.

[0004] According to one aspect of an embodiment of the present application, a storage tank is disclosed, which includes a tank body with a accommodating cavity provided therein; a mounting hole communicating with the accommodating cavity is provided at the bottom of the tank body; a joint is arranged at the mounting hole of the tank body and extends downwardly from the tank body, the interior of the joint is hollow to form a through liquid collecting channel, and the liquid collecting channel is communicated with the accommodating cavity; a sealing structure is detachably arranged on the joint, the sealing structure is configured to seal or open the liquid collecting channel, and the inner circumferential wall of the joint and the sealing structure together enclose a liquid collecting trough with an opening facing the accommodating cavity; a pipe fitting is arranged on the tank body and is at least partially located in the accommodating cavity, and the lower end of the pipe fitting extends into the liquid collecting trough.

[0005] In an exemplary embodiment, the sealing structure is threadedly connected to the joint.

[0006] In an exemplary embodiment, the connector extends axially in the up-down direction, the liquid collecting channel is connected from top to bottom, the upper end of the liquid collecting channel is connected to the accommodating cavity, and the sealing structure is arranged at the bottom end of the connector and can seal the lower end of the liquid collecting channel.

[0007] In an exemplary embodiment, the outer peripheral wall of the sealing structure is threadedly connected to the inner peripheral wall of the joint; the inner diameter of the liquid collecting channel gradually expands from top to bottom, and the outer peripheral wall of the sealing structure gradually expands from top to bottom.

[0008] In an exemplary embodiment, the sealing structure is provided with an anti-rotation structure for pairing with a wrench; the sealing structure is provided with a groove on a side facing away from the joint, the cross-section of the groove is polygonal, and the groove is the anti-rotation structure.

[0009] In an exemplary embodiment, the storage tank further includes a base frame, which is disposed at the bottom of the tank body. The height of the base frame is greater than the distance from the bottom of the sealing structure to the bottom of the tank body.

[0010] In an exemplary embodiment, the pipe fitting extends axially in the up and down directions, the upper end opening of the pipe fitting is provided with a pipe joint, the top of the tank body is provided with a connecting piece, the connecting piece is provided with an installation through hole that passes through the top and bottom, the pipe joint is threadedly connected to the connecting piece, and the pipe fitting passes through the installation through hole.

[0011] In an exemplary embodiment, the tank body includes a cylinder and two heads, the cylinder is through and extends horizontally in the axial direction, the two heads are arranged one-to-one on the axial openings at both ends of the cylinder, and the joint is arranged at the bottom of the cylinder; or the tank body includes a cylinder and two heads, the cylinder is through and extends horizontally in the axial direction, the two heads are arranged one-to-one on the axial openings at both ends of the cylinder, and the joint is arranged at the bottom of the lower head.

[0012] In an exemplary embodiment, an observation tube is provided on the top of the tank body, the observation tube is connected to the accommodating cavity, the observation tube extends axially upward in a direction away from the tank body, a connecting flange is circumferentially provided on the top end of the observation tube, a flange cover is detachably connected to the connecting flange, and the flange cover is configured to cover or open the top end opening of the observation tube.

[0013] In an exemplary embodiment, the storage tank further includes a vent pipe, the bottom end of which passes downward through the flange cover, and the vent pipe is communicated with the observation tube or the accommodating cavity.

[0014] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0015] In the storage tank disclosed in the present application, a joint is provided at the bottom of the tank body, and the internal hole of the joint forms a liquid collecting channel, which is connected to the accommodating chamber of the tank body. The sealing structure can close or open the liquid collecting channel on the joint. When the sealing structure closes the liquid collecting channel, a liquid collecting trough with an opening facing the accommodating chamber is constructed between the inner circumferential wall of the joint and the sealing structure. The liquid collecting trough can be used to continuously collect the liquid in the accommodating chamber. The lower end of the pipe extends into the liquid collecting trough and can discharge the collected liquid out of the tank body through the pipe. When the sealing structure opens the liquid collecting channel, the joint can serve as a sewage outlet of the storage tank and can drain the sewage in the accommodating chamber. Through the detachable matching setting between the joint and the sealing structure, the storage tank can have both liquid collecting and sewage discharging functions, reduce the setting of functional holes on the tank body, ensure the structural strength of the tank body, facilitate the functional layout of the storage tank, reduce interference, and has the advantages of strong practicality, simple structure, easy processing and low production cost.

[0016] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] Figure 1 A schematic diagram of the composition of a storage tank provided in one embodiment of the present application;

[0019] Figure 2 for Figure 1 A partial enlarged view of area A in the middle;

[0020] Figure 3 A structural diagram of a sealing structure provided in one embodiment of the present application;

[0021] Figure 4 A bottom view of a sealing structure provided in one embodiment of the present application;

[0022] Figure 5 A bottom view of a sealing structure provided in another embodiment of the present application;

[0023] Figure 6 A partial enlarged view of area B in the middle.

[0024] The description of the accompanying numbers is as follows: 1-tank body, 11-accommodating chamber, 12-cylinder, 13-head, 2-joint, 21-liquid collecting channel, 3-sealing structure, 31-anti-rotation structure, 311-groove, 4-pipe fitting, 41-pipe joint, 5-connector, 51-mounting through hole, 6-base, 7-observation tube, 71-connecting flange, 8-flange cover, 9-vent pipe. DETAILED DESCRIPTION

[0025] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0026] In the description of this utility model, all connection relationships mentioned do not refer to direct connection of components, but rather to the fact that a more optimal connection structure can be formed by adding or removing connection accessories according to specific implementation conditions. The various technical features of this utility model can be combined interchangeably without conflict.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, “several” means one or more, “more” means more than two, “greater than”, “less than”, “exceed”, etc. are understood to exclude the number itself, and “above”, “below”, “within”, etc. are understood to include the number itself.

[0030] Figure 1 This is a schematic diagram of the structure of the storage tank of the utility model. Figure 2 The storage tank of the utility model is Figure 1 A partial enlarged view of area A. For ease of understanding and description, the tank is placed on the ground as a reference, and the vertical direction is used as the up and down direction in the following description.

[0031] Reference Figure 1 and Figure 2 The storage tank of the present application includes a tank body 1, a joint 2, a sealing structure 3 and a pipe fitting 4. A accommodating chamber 11 is provided in the tank body 1, and a mounting hole that is interconnected with the accommodating chamber 11 is provided at the bottom of the tank body 1. The joint 2 is arranged on the mounting hole of the tank body 1, and the joint 2 extends downward from the mounting hole to the tank body 1. The interior of the joint 2 is hollow and forms a liquid collecting channel 21, and the upper end of the liquid collecting channel 21 is interconnected with the accommodating chamber 11. The sealing structure 3 is detachably arranged on the joint 2, and the sealing structure 3 is configured to be able to seal or open the liquid collecting channel 21. The inner circumferential wall of the joint 2 and the sealing structure 3 jointly enclose a liquid collecting tank with an opening facing the accommodating chamber 11. The pipe fitting 4 is arranged on the tank body 1, and at least a portion of the pipe fitting 4 is located in the accommodating chamber 11, and the lower end of the pipe fitting 4 extends into the liquid collecting tank.

[0032] Specifically, the accommodating chamber 11 in the tank body 1 is used to accommodate liquid materials. When liquid needs to be discharged, the staff installs the sealing structure 3 on the joint 2 and blocks the liquid collecting channel 21. A liquid collecting tank can be constructed between the joint 2 and the sealing structure 3 connected to the joint 2. The liquid collecting tank is located below the accommodating tank. The liquid material can gather in the accommodating tank on its own. By introducing gas into the accommodating chamber 11 and pressing the liquid material into the lower end of the pipe 4, it is finally discharged from the tank body 1 through the pipe 4. When cleaning and sewage discharge are required, the staff removes the sealing structure 3 from the joint 2 so that the liquid collecting channel 21 of the joint 2 remains unobstructed, thereby playing a sewage discharge role. The present application uses a detachable matching arrangement between the joint 2 and the sealing structure 3 to enable the storage tank to have both liquid collection and sewage discharge functions, reduce the setting of functional holes on the tank body 1, ensure the structural strength of the tank body 1, facilitate the functional layout of the storage tank, reduce interference, and has the advantages of strong practicality, simple structure, easy processing, and low production cost.

[0033] The tank body 1 of the present application includes a cylinder 12 and two heads 13. The cylinder 12 is through-hole inside, and the two heads 13 are one-to-one covered on the axial openings at both ends of the cylinder 12. In fact, the heads 13 can be connected to the cylinder 12 by welding. Corresponding to the horizontal tank body 1, the cylinder 12 extends axially in the horizontal direction, the mounting hole is provided at the bottom of the cylinder 12, and the joint 2 is located at the bottom of the cylinder 12. Corresponding to the vertical tank body 1, the cylinder 12 extends axially in the up and down directions, the mounting hole is provided at the bottom of the head 13 located below, and the joint 2 is located at the bottom of the head 13. Ensure that the joint 2 is positioned at the bottom of the cylinder 12, so that the liquid collecting channel 21 of the joint 2 can play the role of collecting liquid and discharging sewage, and the coordinated setting of the joint 2 and the sealing structure 3 can be applicable to the vertical tank body 1 and the horizontal tank body 1, thereby improving applicability.

[0034] In this embodiment, the upper opening of the joint 2 can be sealed and connected to the mounting hole by welding, wherein the top opening of the joint 2 is almost flush with the bottom wall of the accommodating chamber 11 of the tank body 1, ensuring that the liquid material in the tank can flow into the liquid collecting channel 21. In fact, the upper opening of the joint 2 is the end of the liquid collecting channel 21 that is connected to the accommodating chamber 11.

[0035] Furthermore, the connector 2 extends axially in the vertical direction to form a cylindrical shape, and the liquid collecting channel 21 runs through it from top to bottom. The upper end of the liquid collecting channel 21 communicates with the accommodating chamber 11. The sealing structure 3 is provided at the bottom end of the connector 2 and is capable of sealing the lower end of the liquid collecting channel 21. Specifically, the connector 2 is a cylindrical structure extending vertically and having a central opening. The sealing structure 3 is directly opposite the top surface of the connector 2 and the inner wall of the liquid collecting channel 21 formed by the connector 2 to form a liquid collecting groove with an upward opening. The structure is simple and easy to form. The liquid collecting channel 21 formed by the connector 2 can collect liquid and drain waste, and the production cost is low.

[0036] In fact, the connector 2 can be a pipe fitting 4 structure with axial upper and lower openings, or a two-way pipe fitting 4 structure in an L-shape. In addition, the connector 2 can also be a three-way pipe fitting 4 structure or a block structure with an opening. As long as the top opening of the connector 2 can communicate with the accommodating chamber 11 and ensure that the liquid in the accommodating chamber 11 can naturally flow into the liquid collecting channel 21 of the connecting pipe, it can be sufficient. In this application, the liquid collecting channel 21 is through-through along the axial direction of the connector 2, and the through-through direction can also be at an angle to the axial direction of the connector 2.

[0037] Reference Figure 2 The joint 2 and the sealing structure 3 are connected to each other by threads. It is convenient for workers to disassemble and assemble the sealing structure 3 from the joint 2, improve work efficiency, can withstand greater pressure, and ensure the sealing stability when the tank body 1 stores liquid materials with a high liquid level.

[0038] Furthermore, the connector 2 is provided with an internal thread on the inner peripheral wall along the liquid collecting channel 21, and the outer peripheral wall of the sealing structure 3 is provided with an external thread structure that can engage with the internal thread of the connector 2. Moreover, the inner diameter of the liquid collecting channel 21 gradually expands from top to bottom, and the outer peripheral wall of the sealing structure 3 gradually expands from top to bottom. Specifically, the sealing structure 3 extends into the lower end of the liquid collecting channel 21, and the top surface of the sealing structure 3 extending into the liquid collecting channel 21 and the peripheral wall of the liquid collecting channel 21 corresponding to the connector 2 form a liquid collecting groove. Moreover, as the depth of the engagement of the sealing structure 3 on the connector 2 increases, the pressing force of the sealing structure 3 sealing on the liquid collecting channel 21 is increased, thereby improving the sealing effect and sealing stability.

[0039] In addition, the outer peripheral wall of the connector 2 may be provided with an external thread, and the sealing structure 3 may have an internal threaded hole that can be inserted into and engage with the external thread at the bottom end of the connector 2. The liquid collecting channel 21, the bottom wall of the internal threaded hole, and the peripheral wall together enclose a liquid collecting tank. Correspondingly, the outer peripheral wall of the connector 2 may be gradually narrowed from top to bottom, and the outer peripheral wall of the sealing structure 3 may be gradually narrowed from top to bottom. As the engagement depth of the sealing structure 3 and the connector 2 deepens, the sealing structure 3 continuously tightens the outer peripheral wall of the connector 2, thereby ensuring the sealing effect of the sealing structure 3 on the liquid collecting channel 21.

[0040] In practice, the sealing structure 3 is generally cylindrical and has external threads on its outer periphery. Alternatively, the sealing structure 3 may include a cylindrical structure that can engage with the liquid collecting channel 21. Furthermore, the sealing structure 3 may also be a valve that can be opened or closed within the liquid collecting channel 21, or a seal that can be directly removed from or inserted into the liquid collecting channel 21.

[0041] Furthermore, the sealing structure 3 is provided with an anti-rotation structure 31 for pairing with a wrench. By pairing the wrench with the anti-rotation structure 31 , it is convenient for the staff to screw the sealing structure 3 into or out of the joint 2, further facilitating the disassembly and assembly of the sealing structure 3.

[0042] Further, refer to Figure 3 The sealing structure 3 is provided with a groove 311 on the side facing away from the joint 2. The cross-sectional shape of the groove 311 is polygonal and the groove 311 is an anti-rotation structure 31. The cross-sectional shape of the groove 311 matches the shape of the wrench, making it convenient for the staff to disassemble and assemble the sealing structure 3. Figure 4 and Figure 5 The cross-sectional shape of the groove 311 can be a polygon composed entirely of straight lines, or a polygon constructed of straight lines and curves. In fact, the cross-sectional shape of the groove 311 can be a triangle, a rectangle, a cross, or a regular polygon.

[0043] In this embodiment, the liquid collecting channel 21 runs through the joint 2 from top to bottom. The sealing structure 3 is provided at the bottom of the joint 2 and seals the lower end of the liquid collecting channel 21 . The anti-rotation structure 31 is provided on the bottom surface of the sealing structure 3 .

[0044] Reference Figure 1 , the pipe 4 extends axially in the vertical direction. In addition, the pipe 4 can be extended obliquely or arranged in an L-shape, ensuring that the lower end of the pipe 4 extends into the liquid collecting tank surrounded by the joint 2. Further, refer to Figure 6 The upper end opening of the pipe fitting 4 is provided with a pipe joint 41, and the top of the tank body 1 is provided with a connecting piece 5. The connecting piece 5 is provided with a mounting through-hole 51 which passes through from top to bottom. The pipe joint 41 is threadedly connected to the connecting piece 5, and the pipe fitting 4 passes through the mounting through-hole 51. Specifically, the pipe fitting 4 can be detached from the tank body 1 through the threaded fit of the connecting piece 5 and the pipe joint 41, which is convenient for the staff to replace and clean the pipe fitting 4. In addition, the upper and lower positions of the pipe fitting 4 can be adjusted according to the engagement depth of the pipe joint 41 and the connecting piece 5, so that the pipe fitting 4 can penetrate to a position lower than the accommodating cavity 11 and extend into the liquid collecting tank without hitting the bottom of the liquid collecting tank, thereby ensuring the liquid collecting function of the storage tank and being suitable for storage tanks of different sizes.

[0045] In this embodiment, the upper opening of the pipe fitting 4 can be welded to the pipe joint 41, and the outer periphery of the bottom of the connector 5 can be welded and fixed to the tank body 1, so that the top end of the connector 5 extends upwardly out of the tank body 1. The inner peripheral wall of the connector 5 corresponding to the mounting through-hole 51 is provided with an internal thread, and the pipe joint 41 is provided with an external thread that engages with the mounting through-hole 51. The upper end of the pipe fitting 4 passes through the accommodating cavity 11 and extends into the mounting through-hole 51. Alternatively, the pipe joint 41 can be connected to the externally threaded peripheral wall of the connector 5 via an internally threaded hole.

[0046] Furthermore, the storage tank of the present application further includes a base frame 6, which is disposed at the bottom of the tank body 1. The height from the bottom end of the base frame 6 to the tank body 1 is greater than the distance from the bottom of the sealing structure 3 to the bottom of the tank body 1. Specifically, the height of the base frame 6 needs to be greater than the spacing between the sealing structure 3 and the tank body 1, leaving space for disassembly of the sealing structure 3, ensuring that the sealing structure 3 can be smoothly installed or removed from the joint 2.

[0047] like Figure 6 As shown, an observation tube 7 is provided on the top of the tank body 1, which is communicated with the accommodating cavity 11 and extends axially upward in a direction away from the tank body 1. It is convenient for staff to observe the internal situation of the tank body 1 through the upper end opening of the observation tube 7.

[0048] Furthermore, a connecting flange 71 is circumferentially provided at the top of the observation tube 7. A flange cover 8 is detachably connected to the connecting flange 71. The flange cover 8 is configured to cover or open the top opening of the observation tube 7. The flange cover 8 can close or open the observation tube 7. When liquid needs to be drained from the tank 1, the flange cover 8 seals the observation tube 7, ensuring that the liquid can be pressed into the bottom of the pipe 4 and discharged upward. The connecting flange 71 and the flange cover 8 are connected by bolts. When it is necessary to observe the interior of the tank 1, the screws can be removed and the flange cover 8 can be opened.

[0049] In this embodiment, the storage tank further includes a vent tube 9, the bottom end of which extends downward through the flange cover 8. The vent tube 9 is used to allow gas to enter the accommodating chamber 11, thereby increasing the air pressure in the accommodating chamber 11 and thereby forcing the liquid material into the pipe 4 for discharge. By arranging the vent tube 9 on the flange cover 8, the number of openings on the surface of the tank body 1 is reduced, thereby improving the strength of the tank body 1.

[0050] In addition, the vent tube 9 is connected to the observation tube 7. The bottom end of the vent tube 9 is located in the observation tube 7, and the bottom end of the vent tube 9 is open to the observation tube 7 and is connected to each other. The vent tube 9 can be connected to the accommodating chamber 11 of the storage tank through the observation tube 7, while ensuring that the air outlet of the vent tube 9 is located above the liquid level in the accommodating chamber 11.

[0051] In fact, the top of the tank body 1 is also provided with an interface, and a bursting disc is provided on the interface to relieve pressure when the pressure in the storage chamber 11 inside the storage tank is too high, thereby ensuring safety.

[0052] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the appended claims.

Claims

1. A storage tank, characterized in that: include: A tank body is provided with a receiving cavity therein; a mounting hole is provided at the bottom of the tank body and communicates with the receiving cavity; A joint is provided at the mounting hole of the tank body and extends downwardly out of the tank body, wherein the interior of the joint is hollow to form a through liquid collecting channel, and the liquid collecting channel is communicated with the accommodating cavity; a sealing structure detachably disposed on the joint, the sealing structure being configured to seal or open the liquid collecting channel, the inner peripheral wall of the joint and the sealing structure jointly enclosing a liquid collecting trough opening toward the accommodating cavity; A pipe is provided on the tank body and is at least partially located in the accommodating cavity, and the lower end of the pipe extends into the liquid collecting tank.

2. The storage tank according to claim 1, characterized in that The sealing structure is threadedly connected to the joint.

3. The storage tank according to claim 2, characterized in that The joint extends axially in the vertical direction, the liquid collecting channel is connected vertically, the upper end of the liquid collecting channel is connected to the accommodating cavity, and the sealing structure is arranged at the bottom end of the joint and can seal the lower end of the liquid collecting channel.

4. The storage tank according to claim 3, characterized in that The outer peripheral wall of the sealing structure is threadedly connected to the inner peripheral wall of the joint; The inner diameter of the liquid collecting channel gradually expands from top to bottom, and the outer peripheral wall of the sealing structure gradually expands from top to bottom.

5. The storage tank according to claim 2, characterized in that The sealing structure is provided with an anti-rotation structure for pairing with a wrench; A groove is provided on a side of the sealing structure facing away from the joint. The cross-section of the groove is polygonal and serves as the anti-rotation structure.

6. The storage tank according to claim 2 or 3, characterized in that: The storage tank further includes a base frame, which is arranged at the bottom of the tank body. The height of the base frame is greater than the distance from the bottom of the sealing structure to the bottom of the tank body.

7. The storage tank according to claim 1, characterized in that The pipe fitting extends axially in the up-down direction, the upper end opening of the pipe fitting is provided with a pipe joint, the top of the tank body is provided with a connecting piece, the connecting piece is provided with a mounting through hole which passes through the top and bottom, the pipe joint is threadedly connected to the connecting piece, and the pipe fitting passes through the mounting through hole.

8. The storage tank according to claim 1, characterized in that The tank body includes a cylinder and two sealing heads. The cylinder is open inside and extends horizontally in the axial direction. The two sealing heads are arranged one-to-one on the axial openings at both ends of the cylinder. The joint is arranged at the bottom of the cylinder; or The tank body includes a cylinder and two heads. The cylinder is open inside and extends axially up and down. The two heads are arranged one-to-one on the axial openings at both ends of the cylinder, and the joint is arranged at the bottom of the lower head.

9. The storage tank according to claim 1, characterized in that An observation tube is provided on the top of the tank body, which is connected to the accommodating cavity. The observation tube extends axially upward in a direction away from the tank body. A connecting flange is circumferentially provided at the top end of the observation tube. A flange cover is detachably connected to the connecting flange, and the flange cover is configured to cover or open the top end opening of the observation tube.

10. The storage tank according to claim 9, characterized in that The storage tank further comprises a vent pipe, the bottom end of which passes downward through the flange cover; The vent tube is in communication with the observation tube.

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