Drainage structure and pressure vessel

Abstract

The application discloses a blowdown structure and a pressure container. The blowdown structure is used for being connected with the container. The container is internally formed with a containing cavity. The blowdown structure comprises a blowdown connector and a plug. The blowdown connector is formed with a sealing channel and a liquid accumulation cavity which are communicated with each other. The sealing channel is communicated with the containing cavity. The plug is formed with a liquid discharge channel. One end of the plug is formed with a sealing head. The sealing head is inserted into the liquid accumulation cavity so as to make the liquid discharge channel communicated with the liquid accumulation cavity. The plug is movably connected with the blowdown connector. The plug can be moved relative to the blowdown connector so as to make the sealing head adjust the opening degree of the sealing channel. The blowdown connector is formed with the liquid accumulation cavity. The liquid accumulation cavity can buffer the pressure of the blowdown medium, and the impact on the downstream pipeline or equipment caused by the direct blowdown can be avoided. Moreover, the plug is formed with the sealing head. The sealing head can adjust the opening degree of the sealing channel, so as to realize the control of the flow rate and pressure of the blowdown medium.

Description

Technical Field

[0001] This invention relates to the field of pressure vessels, and more specifically to a sewage discharge structure and a pressure vessel. Background Technology

[0002] A pressure vessel is a sealed device that holds gas or liquid under pressure. Pressure vessels play a vital role in chemical, petroleum, power, food, and many other industrial production processes. Pressure vessels typically have a drain outlet for sludge discharge. However, in current technology, most pressure vessel drain outlets are straight-through structures, which fail to buffer the pressure of the discharged medium, and direct discharge can easily cause impacts on downstream pipelines or equipment. Summary of the Invention

[0003] The main objective of this invention is to provide a sewage discharge structure and pressure vessel to solve the problem that traditional straight-through sewage outlets cannot buffer the pressure of the sewage medium.

[0004] To achieve the above objectives, the present invention proposes a drainage structure for connection to a container, wherein the container has a receiving cavity, and the drainage structure includes a drainage pipe and a plug. The drainage pipe forms a connected sealed channel and a liquid accumulation cavity, and the sealed channel is connected to the receiving cavity. The plug forms a drainage channel, and one end of the plug forms a sealing head. The sealing head is inserted into the liquid accumulation cavity to connect the drainage channel with the liquid accumulation cavity. The plug is movably connected to the drainage pipe, and the plug can move relative to the drainage pipe to adjust the opening of the sealed channel.

[0005] Optionally, the plug is movably disposed within the liquid accumulation chamber along a first direction, and the plug moves relative to the drain pipe to allow the sealing head to adjust the opening of the sealing channel.

[0006] Optionally, the plug has a first threaded section, and the drain pipe has a second threaded section, the first threaded section and the second threaded section being threadedly connected; and / or,

[0007] A stop block is provided at the end of the plug away from the sealing head. The size of the stop block is larger than the size of the plug to form a stop surface, which is used to abut against the sewage pipe.

[0008] Optionally, the sealing channel includes an inlet section and a sealing section that are sequentially connected along the direction from the receiving cavity to the liquid accumulation cavity. The sealing section is tapered in the direction close to the inlet section, and the sealing head matches the shape of the sealing section.

[0009] Optionally, the sealing head is conical, and the angle of the apex angle of the sealing head is 20° to 80°.

[0010] Optionally, the cross-sectional dimension of the fluid accumulation cavity is larger than the cross-sectional dimension of the sealing channel.

[0011] Optionally, the drainage channel includes a first connecting channel and a second connecting channel, wherein the first connecting channel extends radially along the plug and communicates with the liquid accumulation chamber, and the second connecting channel extends axially along the plug and communicates with the first connecting channel.

[0012] Optionally, there may be multiple first connection channels, which are spaced apart circumferentially along the plug.

[0013] Optionally, the bottom wall of the first connecting channel is higher than the bottom wall of the liquid accumulation cavity, so that a buffer gap is formed between the bottom wall of the first connecting channel and the bottom wall of the liquid accumulation cavity.

[0014] In addition, the present invention also provides a pressure vessel, the pressure vessel including a container and a drain structure as described above, the drain pipe being connected to the container, a receiving cavity being formed inside the container, and a sealing channel communicating with the receiving cavity.

[0015] In this invention, a drainage structure is connected to a container to drain wastewater from the container, ensuring its normal operation. A receiving cavity is formed inside the container to hold the wastewater discharge medium. One end of a sealing channel is connected to the receiving cavity, and the other end is connected to a liquid accumulation cavity. The sealing channel allows the wastewater discharge medium in the receiving cavity to flow into the liquid accumulation cavity. A plug has a drainage channel, with a sealing head at one end. The sealing head is inserted into the liquid accumulation cavity, connecting one end of the drainage channel to the liquid accumulation cavity. The other end of the drainage channel is used to connect to a downstream pipe or equipment, allowing the wastewater discharge medium to be discharged to the downstream pipe or equipment. The wastewater discharge medium in the receiving cavity flows to the sealing channel and then to the liquid accumulation cavity. The liquid accumulation cavity buffers the pressure of the wastewater discharge medium. The buffered wastewater discharge medium is then discharged to the downstream pipe or equipment through the drainage channel, preventing direct discharge from impacting the downstream pipe or equipment. A sealing head is formed at the end of the plug near the receiving cavity, and the plug is movably connected to the wastewater discharge pipe. The plug is movable relative to the drain pipe, allowing the sealing head to adjust the opening of the sealing channel, thereby controlling the flow rate and pressure of the drain medium. This makes the drain structure more flexible and convenient to use. The drain pipe in this invention has a liquid accumulation chamber, which buffers the pressure of the drain medium, preventing direct discharge from impacting downstream pipes or equipment. Furthermore, the plug in this invention has a sealing head, the opening of which can be adjusted to control the flow rate and pressure of the drain medium. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a pressure vessel according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the sewage pipe in a sewage discharge structure according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the plug structure in a sewage discharge structure according to an embodiment of the present invention.

[0021] Explanation of icon numbers:

[0022] 100 Sewage structure 212 Second connection channel 10 Sewage connection 22 Sealing head 11 Sealed channel 23 First thread section 111 Inlet section 24 Stop block 112 Sealing section 241 Stop surface 12 fluid accumulation cavity 25 First connecting section 13 Buffer gap 26 Second connecting section 14 Connecting hole 200 pressure vessel 141 Second thread section 201 container 20 plug 202 Receiving cavity 21 Drainage channel 203 sewage outlet 211 First connection channel

[0023] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their 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 invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0029] In this invention, the descriptions of directions such as "up," "down," "front," "back," "left," and "right" are as follows: Figure 1 The directions shown are for reference only and are used to interpret the location. Figure 1 The relative positional relationship between the components in the shown posture is such that if the specific posture changes, the directional indication will also change accordingly.

[0030] This invention provides a sewage discharge structure and a pressure vessel.

[0031] In one embodiment, such as Figures 1 to 2 As shown, the drain structure 100 is used to connect to the container 201, and the container 201 has a receiving cavity 202. The drain structure 100 includes a drain pipe 10 and a plug 20. The drain pipe 10 has a connected sealed channel 11 and a liquid accumulation cavity 12. The sealed channel 11 is connected to the receiving cavity 202. The plug 20 has a drain channel 21. One end of the plug 20 has a sealing head 22. The sealing head 22 is inserted into the liquid accumulation cavity 12 to connect the drain channel 21 and the liquid accumulation cavity 12. The plug 20 is movably connected to the drain pipe 10. The plug 20 can move relative to the drain pipe 10 so that the sealing head 22 can adjust the opening of the sealed channel 11.

[0032] The drain structure 100 is connected to the container 201 to drain the wastewater from the container 201, ensuring its normal operation. A receiving cavity 202 is formed inside the container 201 to receive the wastewater medium. The upper end of the sealing channel 11 is connected to the receiving cavity 202, and the lower end of the sealing channel 11 is connected to the liquid accumulation cavity 12. The sealing channel 11 allows the wastewater medium in the receiving cavity 202 to flow into the liquid accumulation cavity 12. The plug 20 forms a drain channel 21, and one end of the plug 20 forms a sealing head 22, which is inserted into the liquid accumulation cavity 12, connecting one end of the drain channel 21 to the liquid accumulation cavity 12. The other end of the drain channel 21 is used to connect to a downstream pipeline or equipment, allowing the wastewater medium to be discharged to the downstream pipeline or equipment.

[0033] The sewage medium in the receiving cavity 202 flows to the sealing channel 11, and then flows to the liquid accumulation cavity 12 through the sealing channel 11. The liquid accumulation cavity 12 can buffer the pressure of the sewage medium. The sewage medium buffered by the liquid accumulation cavity 12 is discharged to the downstream pipeline or equipment through the drainage channel 21 to avoid direct sewage discharge from impacting the downstream pipeline or equipment.

[0034] A sealing head 22 is formed at the end of the plug 20 near the receiving cavity 202, and the plug 20 is movably connected to the drain pipe 10. The plug 20 can move relative to the drain pipe 10 so that the sealing head 22 can adjust the opening of the sealing channel 11, thereby controlling the flow rate and pressure of the drain medium, making the use of the drain structure 100 more flexible and convenient.

[0035] The drain pipe 10 of this invention has a liquid accumulation chamber 12, which can buffer the pressure of the drain medium and prevent direct discharge from impacting downstream pipes or equipment. Furthermore, the plug 20 of this invention has a sealing head 22, which can adjust the opening of the sealing channel 11 to control the flow rate and pressure of the drain medium.

[0036] Specifically, the container 201 has a drain port 203 that communicates with the receiving cavity 202. The drain pipe 10 is connected to the wall of the drain port 203. The sealed channel 11 is connected to the receiving cavity 202 through the drain port 203, so as to realize the connection between the drain structure 100 and the container 201.

[0037] In one embodiment, please refer to the reference Figure 2 The plug 20 is movably disposed in the liquid accumulation chamber 12 along the first direction. The plug 20 moves relative to the drain pipe 10 so that the sealing head 22 adjusts the opening of the sealing channel 11.

[0038] The first direction is Figure 1The plug 20 is located in the liquid accumulation chamber 12 and can move relative to the drain pipe 10 in the vertical direction to change the gap between the sealing head 22 and the sealing channel 11. This gap allows the drain medium to flow, so that the sealing head 22 can adjust the opening of the sealing channel 11 to control the flow rate and pressure of the drain medium.

[0039] The plug 20 moves upward relative to the drain pipe 10, reducing the gap between the sealing head 22 and the wall of the sealing channel 11, thereby reducing the opening of the sealing channel 11 and thus lowering the flow rate and pressure of the drain medium. Conversely, the plug 20 moves downward relative to the drain pipe 10, increasing the gap between the sealing head 22 and the wall of the sealing channel 11, thereby increasing the opening of the sealing channel 11 and thus raising the flow rate and pressure of the drain medium.

[0040] In one embodiment, please refer to the reference Figures 2 to 4 The plug 20 has a first threaded section 23, and the drain pipe 10 has a second threaded section 141. The first threaded section 23 and the second threaded section 141 are threadedly connected.

[0041] The end of the plug 20 away from the sealing head 22 has a first threaded section 23, and the drain pipe 10 has a second threaded section 141. Both the first threaded section 23 and the second threaded section 141 extend in the vertical direction. Specifically, the drain pipe 10 has a connecting hole 14, which connects to the end of the liquid accumulation chamber 12 away from the sealing channel 11. The wall of the connecting hole 14 has a second threaded section 141.

[0042] The first threaded section 23 and the second threaded section 141 are threadedly connected, enabling rapid opening and closing of the sealing channel 11. Tightening the plug 20 moves it upwards, reducing the gap between the sealing head 22 and the wall of the sealing channel 11, thus decreasing the opening of the sealing channel 11. Tightening the plug 20 in the opposite direction moves it downwards, increasing the gap between the sealing head 22 and the wall of the sealing channel 11, thus increasing the opening of the sealing channel 11. The threaded connection between the first threaded section 23 and the second threaded section 141 facilitates the adjustment of the sealing head 22's opening of the sealing channel 11, enabling rapid opening and closing of the sealing channel 11. The structural design is reasonable and easy to manufacture. Furthermore, the threaded connection has a self-locking function, preventing the plug 20 from moving under the pressure of the discharge medium, making the connection between the plug 20 and the discharge pipe 10 more stable and reliable.

[0043] In the preferred technical solution, the first threaded section 23 and the second threaded section 141 are tapered threads. Due to the taper, the tapered threads have a self-tightening effect when they are engaged, which makes the plug 20 and the drain pipe 10 have better sealing performance. At the same time, the tapered threads have higher pressure resistance, which makes the connection between the plug 20 and the drain pipe 10 tighter and more reliable.

[0044] In a preferred embodiment, the plug 20 includes a first connecting section 25 and a second connecting section 26 connected to each other. The first connecting section 25 forms a sealing head 22, and the second connecting section 26 forms a drainage channel 21. The size of the first connecting section 25 is smaller than that of the second connecting section 26, which facilitates the plug 20 to extend into the liquid accumulation chamber 12, making the installation of the plug 20 more convenient.

[0045] In one embodiment, please refer to the reference Figure 2 and Figure 4 The end of the plug 20 away from the sealing head 22 is provided with a stop block 24. The size of the stop block 24 is larger than the size of the plug 20 to form a stop surface 241, which is used to abut against the drain pipe 10.

[0046] The stop block 24 is located at the end of the plug 20 furthest from the sealing head 22, i.e., the stop block 24 is positioned at the lower end of the plug 20. The size of the stop block 24 is larger than that of the plug 20, so that a stop surface 241 is formed between the stop block 24 and the plug 20. The stop surface 241 is used to abut against the drain pipe 10, preventing the plug 20 from extending excessively into the drain pipe 10 and becoming difficult to remove, thus making the use of the plug 20 more convenient. Furthermore, the stop block 24 allows the operator to easily rotate the plug 20, enabling the plug 20 to move vertically relative to the drain pipe 10, thereby improving the efficiency of adjusting the opening of the sealing channel 11.

[0047] In one embodiment, please refer to the reference Figures 2 to 4 The sealing channel 11 includes an inlet section 111 and a sealing section 112 that are connected sequentially along the direction from the receiving cavity 202 to the liquid accumulation cavity 12. The sealing section 112 is gradually tapered along the direction close to the inlet section 111, and the sealing head 22 matches the shape of the sealing section 112.

[0048] The sealing channel 11 includes an inlet section 111 and a sealing section 112 connected in sequence. The inlet section 111 is connected to the receiving cavity 202, and the sealing section 112 is connected to the accumulating cavity 12, thus connecting the sealing channel 11 between the receiving cavity 202 and the accumulating cavity 12. The discharge medium in the receiving cavity 202 enters from the inlet section 111, flows through the sealing section 112, and then enters the accumulating cavity 12. The sealing section 112 is tapered towards the inlet section 111, meaning the dimension of the sealing section 112 near the accumulating cavity 12 is larger than the dimension of the end near the inlet section 111. This design serves as a guide, allowing the discharge medium in the sealing section 112 to flow quickly into the accumulating cavity 12. Furthermore, the sealing head 22 matches the shape of the sealing section 112, facilitating adjustment of the opening of the sealing section 112 by the sealing head 22 to regulate the flow rate and pressure of the discharge medium.

[0049] In one embodiment, please refer to the reference Figure 2 and Figure 4 The sealing head 22 is conical, with an apex angle ranging from 20° to 80°. If the apex angle of the sealing head 22 is less than 20°, the length of the sealing head 22 is too long, making it inconvenient to adjust the opening of the sealing section 112. If the apex angle of the sealing head 22 is greater than 80°, the guiding effect of the sealing section 112 is poor, resulting in poor sealing between the sealing head 22 and the sealing section 112. Therefore, the apex angle of the sealing head 22 is between 20° and 80° to ensure the guiding effect of the sealing section 112, to ensure that the sealing head 22 can seal the sealing channel 11, and to facilitate the adjustment of the opening of the sealing channel 11 by the sealing head 22, achieving rapid and tight sealing.

[0050] In other embodiments, the shape of the sealing head 22 can be adjusted according to actual needs, and the sealing head 22 can be arc-shaped or other shapes.

[0051] In one embodiment, please refer to the reference Figure 2 The cross-sectional dimension of the accumulating chamber 12 is larger than that of the sealing channel 11. The sewage medium in the receiving chamber 202 flows into the accumulating chamber 12 through the sealing channel 11. The larger cross-sectional dimension of the accumulating chamber 12 allows the sewage medium to remain in the accumulating chamber 12 before flowing into the drain channel 21, and then being discharged to downstream pipelines or equipment. By setting up the accumulating chamber 12, the flow rate of the sewage medium can be reduced, thereby buffering the pressure of the sewage medium and preventing direct discharge from impacting downstream pipelines or equipment.

[0052] The present invention does not limit the volume and shape of the liquid accumulation chamber 12, and the shape and volume of the liquid accumulation chamber 12 can be flexibly adjusted according to the actual working conditions.

[0053] In one embodiment, please refer to the reference Figure 2 and Figure 3 The drainage channel 21 includes a first connecting channel 211 and a second connecting channel 212 that are connected to each other. The first connecting channel 211 is connected to the liquid accumulation chamber 12 and extends radially along the plug 20, while the second connecting channel 212 extends axially along the plug 20.

[0054] The drainage channel 21 includes a first connecting channel 211 and a second connecting channel 212, which are connected to each other. The first connecting channel 211 extends radially along the plug 20, and the drainage channel 21 is connected to the liquid accumulation chamber 12 through the first connecting channel 211. The second connecting channel 212 extends axially along the plug 20, that is, it extends vertically, and the drainage channel 21 is connected to downstream pipes or equipment through the second connecting channel 212.

[0055] The sewage medium in the receiving cavity 202 enters the liquid accumulation cavity 12 through the sealed channel 11. The liquid accumulation cavity 12 buffers the pressure of the sewage medium. The buffered sewage medium enters the first connecting channel 211 and then flows into the second connecting channel 212, and then flows into the downstream pipeline or equipment through the second connecting channel 212.

[0056] The top of the second connecting channel 212 can be higher than the top of the first connecting channel 211, leaving a machining allowance.

[0057] In one embodiment, please refer to the reference Figure 2 and Figure 3 The number of first connection channels 211 is multiple, and the multiple first connection channels 211 are arranged at intervals along the circumference of the plug 20.

[0058] Sewage discharge efficiency can be improved by setting multiple first connecting channels 211 at intervals along the circumference of the plug 20. Specifically, the multiple first connecting channels 211 are evenly spaced along the circumference of the plug 20 to make the force on the plug 20 more uniform in all directions and extend the service life of the plug 20.

[0059] The number of first connection channels 211 can be one, two or more, and the number of first connection channels 211 can be flexibly adjusted according to actual working conditions. The present invention does not limit the number of first connection channels 211.

[0060] Depending on the actual working conditions, the flow rate can also be changed by altering the diameters of the first connecting channel 211 and the second connecting channel 212.

[0061] In one embodiment, please refer to the reference Figure 2 The bottom wall of the first connecting channel 211 is higher than the bottom wall of the liquid accumulation cavity 12, so that a buffer gap 13 is formed between the bottom wall of the first connecting channel 211 and the bottom wall of the liquid accumulation cavity 12.

[0062] By setting the bottom wall of the first connecting channel 211 higher than the bottom wall of the liquid accumulation chamber 12, i.e., creating a height difference between them, a buffer gap 13 is formed. When the sewage medium in the receiving chamber 202 enters the liquid accumulation chamber 12 through the sealed channel 11 at a low speed, it needs to gradually accumulate to fill the buffer gap 13 before entering the first connecting channel 211 and then being discharged into downstream pipelines or equipment through the second connecting channel 212. When the sewage medium in the receiving chamber 202 enters the liquid accumulation chamber 12 through the sealed channel 11 at a higher speed, the liquid accumulation chamber 12 is quickly filled. The buffer gap 13 positions the first connecting channel 211 in the middle of the liquid accumulation chamber. Therefore, the sewage medium in the middle is buffered and gradually enters the first connecting channel 211 before being discharged into downstream pipelines or equipment through the second connecting channel 212. By setting a buffer gap 13 to buffer and decelerate the sewage discharge medium, the sewage discharge structure 100 has a better buffering effect, avoiding direct sewage discharge from impacting downstream pipelines or equipment.

[0063] Additionally, please refer to the following: Figure 1 The present invention also provides a pressure vessel 200, which includes a container 201 and a drain structure 100 as described above. A drain pipe 10 is connected to the container 201, and a receiving cavity 202 is formed within the container 201. A sealing channel 11 communicates with the receiving cavity 202. The specific structure of the drain structure 100 is as described in the above embodiments. Since the pressure vessel 200 adopts all the technical solutions of the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0064] Pressure vessels 200 mainly include storage pressure vessels, reaction pressure vessels, heat exchange pressure vessels, and separation pressure vessels. Storage pressure vessels are primarily used for storing and containing media such as gases, liquids, and liquefied gases, such as various types of storage tanks. Reaction pressure vessels are mainly used to complete physical and chemical reactions of media, such as reactors, reaction vessels, decomposition kettles, vulcanizing tanks, decomposition towers, polymerization towers, autoclaves, ultra-high pressure autoclaves, synthesis towers, converters, cooking pots, steam spheres, autoclaves, and gasifiers. Heat exchange pressure vessels are mainly used to complete heat exchange of media, such as shell-and-tube waste heat boilers, heat exchangers, coolers, condensers, evaporators, heaters, sterilizers, dyeing machines, drying cylinders, steaming pans, preheating pans, solvent preheaters, steamers, desiccant generators, electric steam generators, and water jacketed gasifiers. Pressure vessels are mainly used to perform fluid pressure balancing and buffering of media and gas purification and separation, such as separators, filters, oil collectors, buffers, scrubbers, absorption towers, copper washing towers, drying towers, stripping towers, steam separators, deaerators, etc.

[0065] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A sewage discharge structure for connection to a container, the container having a receiving cavity, characterized in that, The sewage discharge structure includes: A sewage discharge pipe has a connected sealed channel and a liquid accumulation chamber, and the sealed channel is connected to the receiving chamber; A plug having a drainage channel and a sealing head at one end, the sealing head being inserted into the liquid accumulation cavity to connect the drainage channel to the liquid accumulation cavity, the plug being movably connected to the drain pipe, and the plug being movable relative to the drain pipe to adjust the opening of the sealing channel by the sealing head; The plug is movably disposed in the liquid accumulation chamber along the first direction, and the plug moves relative to the drain pipe to allow the sealing head to adjust the opening of the sealing channel; The plug has a first threaded section, and the drain pipe has a second threaded section; the first threaded section and the second threaded section are threadedly connected. A stop block is provided at the end of the plug away from the sealing head. The size of the stop block is larger than the size of the plug to form a stop surface. The stop surface is used to abut against the sewage pipe. Tighten the plug to move it along the first direction, thereby reducing or increasing the gap between the sealing head and the wall of the sealing channel, and correspondingly reducing or increasing the opening of the sealing channel.

2. The sewage discharge structure as described in claim 1, characterized in that, A stop block is provided at the end of the plug away from the sealing head. The size of the stop block is larger than the size of the plug to form a stop surface, which is used to abut against the sewage pipe.

3. The sewage discharge structure as described in claim 1, characterized in that, The sealing channel includes an inlet section and a sealing section that are sequentially connected along the direction from the receiving cavity to the liquid accumulation cavity. The sealing section is gradually tapered along the direction close to the inlet section, and the sealing head matches the shape of the sealing section.

4. The sewage discharge structure as described in claim 3, characterized in that, The sealing head is conical, and the angle of the apex of the sealing head is 20° to 80°.

5. The sewage discharge structure as described in any one of claims 1 to 4, characterized in that, The cross-sectional dimension of the fluid accumulation cavity is larger than the cross-sectional dimension of the sealing channel.

6. The sewage discharge structure as described in any one of claims 1 to 4, characterized in that, The drainage channel includes a first connecting channel and a second connecting channel. The first connecting channel extends radially along the plug and communicates with the liquid accumulation chamber, while the second connecting channel extends axially along the plug and communicates with the first connecting channel.

7. The sewage discharge structure as described in claim 6, characterized in that, The number of the first connection channels is multiple, and the multiple first connection channels are arranged at intervals along the circumference of the plug.

8. The sewage discharge structure as described in claim 6, characterized in that, The bottom wall of the first connecting channel is higher than the bottom wall of the liquid accumulation cavity, so that a buffer gap is formed between the bottom wall of the first connecting channel and the bottom wall of the liquid accumulation cavity.

9. A pressure vessel, characterized in that, The pressure vessel includes a container and a drain structure as described in any one of claims 1 to 8, wherein the drain pipe is connected to the container, a receiving cavity is formed inside the container, and the sealing channel communicates with the receiving cavity.

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