A hydrogen storage container

Abstract

The present invention belongs to the field of solid-state hydrogen storage technology, and in particular, relates to a hydrogen storage container. The hydrogen storage container described in the technology includes a pot body and a pot cover that are sealed together. The pot body and the pot cover form a sealed storage space for storing granular hydrogen storage materials; the longitudinal cross-section of the pot body is an arc-shaped structure, and the center of the arc is located between the pot body and the pot cover; a hydrogen inlet pipe is sealed and installed on the pot cover; the hydrogen inlet end of the hydrogen inlet pipe is located on the outside of the pot cover, and the hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body. The present invention solves the problem of how to increase the maximum effective specific surface area of ​​the hydrogen storage material in the hydrogen storage container during the hydrogen absorption process while avoiding stress damage to the container, thereby facilitating the adsorption of hydrogen.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid-state hydrogen storage, and in particular relates to a hydrogen storage container. Background Art

[0002] Solid-state hydrogen storage technology, with its high hydrogen storage density, low pressure requirements, excellent safety, and high hydrogen purity, is considered a key development direction in the hydrogen storage field. However, this technology involves significant heat exchange during the hydrogen charging and discharging process. Failure to effectively dissipate heat or heat treatment in a timely manner will directly affect the continuity of the charging and discharging operations. In addition, the volume expansion of the material after hydrogen absorption may cause concentrated stress damage to the container, and existing container designs do not provide adequate protection against this.

[0003] In response to the above challenges, a technical solution with Chinese patent application number 202110669632.7 came into being, which discloses a solid-state hydrogen storage tank designed specifically for magnesium-based hydrogen storage. This tank body not only integrates a heat exchange box and a walking mechanism, but also cleverly arranges multiple hydrogen absorption tubes and air supply tubes on the side wall. Each hydrogen absorption tube is equipped with a propulsion temperature control mechanism to form a set of precision control system. By setting up multiple hydrogen absorption tubes, the increase in volume accompanying the hydrogen absorption process will squeeze the slider, causing it to push the pressure rod to move out of position, so that the pressure generated by the volume change process can be controlled. The effective distribution of the hydrogen absorption tubes allows the actual pressure to be evenly distributed, thereby effectively avoiding uneven force on the tank body and avoiding stress concentration on the hydrogen absorption material during the hydrogen absorption expansion process, which may cause damage to the tank body.

[0004] In the above technical solution, when storing hydrogen, the hydrogen storage material is placed in the hydrogen absorption tube. The hydrogen storage material is generally in a granular structure (the granular structure is selected because of its large specific surface area). Due to the increase in volume during the hydrogen absorption process, the slider will be squeezed to move. Therefore, the hydrogen storage material in the hydrogen absorption tube will basically be in a horizontal stacking state. Otherwise, it will be impossible to complete the squeezing of the slider to move when the volume of the hydrogen storage material increases. Under such stacking, hydrogen is transported through the design of the patented hydrogen absorption tube and the air supply tube. Although the stress damage of the hydrogen absorption material to the tank body is avoided to the greatest extent, it is difficult to ensure that the hydrogen is fully in contact with the hydrogen storage material when the hydrogen storage material absorbs hydrogen. The effective specific surface area during hydrogen absorption cannot be maximized, which is not conducive to the adsorption of hydrogen. Summary of the Invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to increase the maximum effective specific surface area of ​​the hydrogen storage material in the hydrogen storage container during the hydrogen absorption process while avoiding stress damage to the container, thereby facilitating the adsorption of hydrogen.

[0006] The hydrogen storage container comprises a pot body and a pot cover which are sealed together, wherein the pot body and the pot cover form a sealed storage space for storing the granular hydrogen storage material;

[0007] The longitudinal cross-section of the pot body is an arc-shaped structure, and the center of the arc is located between the pot body and the pot cover;

[0008] A hydrogen inlet pipe is sealed and passed through the pot cover; a hydrogen inlet end of the hydrogen inlet pipe is located outside the pot cover, and a hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body.

[0009] Furthermore, the storage space is filled with spherical granular hydrogen storage material.

[0010] Furthermore, the hydrogen inlet pipe includes a first hydrogen inlet pipe and a second hydrogen inlet pipe that are vertically arranged and spaced apart. The first hydrogen inlet pipe and the second hydrogen inlet pipe are both sealed and installed on the pot cover. The hydrogen inlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe are located on the outside of the pot cover. The hydrogen outlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe are located in the storage space and face the inner wall of the pot body. The hydrogen outlet end of the second hydrogen inlet pipe is lower than the hydrogen outlet end of the first hydrogen inlet pipe.

[0011] Furthermore, the roughness of the inner surface of the pot body is less than 1 to 10 μm.

[0012] Furthermore, the outer side of the pot body is covered with a jacket, and a sealed heat exchange chamber is formed between the jacket and the pot body. The upper end of the jacket is provided with a liquid outlet communicating with the heat exchange chamber, and the lower end of the jacket is provided with a liquid inlet communicating with the heat exchange chamber.

[0013] Furthermore, a hydrogen outlet is provided on the top of the pot cover, and a hydrogen outlet pipe is sealed and installed at the hydrogen outlet.

[0014] Furthermore, there are multiple first hydrogen inlet pipes and multiple second hydrogen inlet pipes.

[0015] Furthermore, the hydrogen inlet ends of all the first hydrogen inlet pipes and the second hydrogen inlet pipes are equipped with solenoid valves.

[0016] Furthermore, the air inlets of all first hydrogen inlet pipes are connected to the same first gas supply branch pipe, and the air inlets of all second hydrogen inlet pipes are connected to the same second gas supply branch pipe. The first gas supply branch pipe and the second gas supply branch pipe are connected by a metal hose, and the air inlet ends of the two metal hoses are connected to the hydrogen inlet main pipe through a three-way joint.

[0017] Furthermore, a skirt is provided below the pot body, and the pot body is mounted on the skirt.

[0018] Furthermore, a skirt is provided below the pot body, the pot body is rotatably connected to the skirt, and a locking assembly for locking the pot body to the skirt is provided at the hinge.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. Under the coordinated design of the hydrogen inlet pipe and the pot body, compared with the existing hydrogen storage material stored in the hydrogen absorption tube, the granular hydrogen storage material can be blown when hydrogen is input, providing an environment for the hydrogen storage material to move when absorbing hydrogen. Compared with the existing hydrogen storage material stored in the hydrogen absorption tube to absorb hydrogen, the contact area between the moving hydrogen storage material and hydrogen is larger, which is conducive to hydrogen absorption.

[0021] 2. This design uses a storage space formed by the sealed combination of the pot body and the pot lid, which makes it easy to control the amount of hydrogen storage material added and effectively utilizes the storage space. When in use, you only need to know the volume of the space and the expansion amount of the hydrogen storage material after absorbing hydrogen to determine the amount of hydrogen storage material added to the space.

[0022] 3. This design uses spherical, granular hydrogen storage materials, which are more conducive to blowing through the hydrogen inlet pipe. During the blowing process, some spherical particles will rotate, further increasing the contact area between the hydrogen and the hydrogen storage material. In motion, the stress generated by hydrogen absorption is better dispersed than in a static state, which can better solve the problem of avoiding stress damage to the container while maximizing the contact area, thereby promoting hydrogen adsorption.

[0023] 4. The jacket design of this invention achieves high heat exchange efficiency. This design utilizes the principle of heat exchange jacketed tanks currently used in the chemical industry. A heat exchange medium can be added to the heat exchange chamber to cool or heat the tank. This high heat exchange design greatly enhances hydrogen absorption by the moving hydrogen storage material due to the high gas flow rate. Furthermore, the movement of the hydrogen storage material also accelerates heat transfer, facilitating heat exchange.

[0024] 5. This design adopts the coordinated design of the first hydrogen inlet pipe and the second hydrogen inlet pipe. By taking advantage of the different heights of the hydrogen outlet ends of the first hydrogen inlet pipe and the second hydrogen inlet pipe, the hydrogen storage materials at different positions can be blown to further promote the movement of the hydrogen storage materials.

[0025] 6. The design of adopting several first hydrogen inlet pipes and second hydrogen inlet pipes can further blow the hydrogen storage materials at different positions, thereby accelerating the movement of the hydrogen storage materials.

[0026] 7. Under the design of the solenoid valve, it is convenient to adjust the flow rate of each first hydrogen inlet pipe and the second hydrogen inlet pipe. At the same time, by staggered control of the flow rate of each first hydrogen inlet pipe and the second hydrogen inlet pipe, the hydrogen storage material can be operated according to a certain trajectory. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the present invention;

[0028] Figure 2 for Figure 1 Schematic diagram of the top view structure;

[0029] Figure 3 for Figure 1 Schematic diagram of the right view structure;

[0030] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of the present invention;

[0032] Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention during unloading;

[0033] Figure 7 It is a schematic diagram of the explosion structure of the present invention.

[0034] Figure numerals: 1. pot cover; 2. pressure gauge; 3. hydrogen outlet valve; 4. hydrogen outlet pipe; 5. solenoid valve; 6. metal hose; 7. three-way connector; 8. hydrogen inlet valve; 9. first hydrogen inlet pipe; 10. angle code; 11. screw; 12. stabilizer; 13. pot body; 14. jacket; 15. skirt; 16. liquid inlet; 17. second hydrogen inlet pipe; 18. liquid outlet; 19. rotating shaft; 20. three-way connector; 21. safety valve; 22. thermometer; 23. hydrogen outlet. DETAILED DESCRIPTION

[0035] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but the present invention is not limited thereto. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1 to 7 As shown, a hydrogen storage container described in this embodiment includes a pot body 13 and a pot cover 1 that are sealed together. The pot cover 1 and the pot body 13 are connected in a detachable sealed installation manner, which is convenient for replacing hydrogen storage materials and daily repairs. Of course, if the pot body 13 used is very large, then considering that the pot cover 1 will also become larger, it will be very troublesome during the disassembly process. In this case, a manhole can be designed on the pot cover 1. The design of the manhole refers to the tanks or kettles with manholes in the chemical industry.

[0038] like Figure 1 or Figure 7As shown, the longitudinal cross-section of pot body 13 is arc-shaped, with the center of the arc located between pot body 13 and pot lid 1. Pot body 13 as a whole resembles a round-bottomed pot commonly used for cooking at home. To further enhance the hydrogen dispersion efficiency of the inner surface of pot body 13, this embodiment preferably has an inner surface roughness of less than 1 μm. The lower the roughness, the smoother the inner surface of pot body 13, the less restricted the movement of hydrogen storage particles, making them less likely to remain on the inner surface of pot body 13. This results in faster stress dispersion and better hydrogen dispersion. In practical applications, different roughness values ​​can be selected based on different processing conditions, such as 10 μm, 1.25, 3, 5, 6, or any value between 1 and 10 μm.

[0039] The pot body 13 and the pot cover 1 form a closed storage space for storing granular hydrogen storage materials. In this embodiment, the hydrogen storage material is preferably in the form of spherical particles, which facilitates the movement of the hydrogen storage material and has many gaps between the particles, which is convenient for the adsorption of hydrogen.

[0040] The pot cover 1 is sealed with a hydrogen inlet pipe. Figure 2 As shown, in this embodiment, two first hydrogen inlet pipes 9 and second hydrogen inlet pipes 17 are selected as hydrogen inlet pipes. When used, their number can be determined according to the size of the pot body 13 and the quality of the hydrogen storage material. Of course, if the volume of the pot body 13 is small, one hydrogen inlet pipe can also be used. Ultimately, it is sufficient to allow the hydrogen storage material to perform a certain movement when absorbing hydrogen.

[0041] For convenience, a hydrogen outlet 23 is provided on the top of the pot lid 1. A hydrogen outlet pipe 4 is sealed and mounted at the hydrogen outlet 23. A hydrogen outlet valve 3 is mounted on the hydrogen outlet pipe 4. Of course, if the pot body 13 is relatively small, the air inlet pipe can be used directly as the hydrogen outlet pipe, achieving dual purposes. If dual purposes are achieved, the hydrogen inlet pipe and the hydrogen outlet 23 are detachably connected, typically by threaded connection.

[0042] The hydrogen inlet pipe includes a first hydrogen inlet pipe 9 and a second hydrogen inlet pipe 17 that are vertically arranged and spaced apart. The first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are both sealed and installed on the pot cover 1. The hydrogen inlet ends of the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are located outside the pot cover 1. The hydrogen outlet ends of the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17 are located in the storage space and face the inner wall of the pot body 13. The hydrogen outlet end of the second hydrogen inlet pipe 17 is lower than the hydrogen outlet end of the first hydrogen inlet pipe 9.

[0043] In order to facilitate control, the air inlets of the two first hydrogen inlet pipes 9 are connected to the same first gas supply branch pipe, and the air inlets of the two second hydrogen inlet pipes 17 are connected to the same second gas supply branch pipe. The first gas supply branch pipe and the second gas supply branch pipe are connected by a metal hose 6. The air inlet ends of the two metal hoses 6 are connected to the hydrogen inlet main pipe through a three-way joint 7. The hydrogen inlet main pipe is equipped with a hydrogen inlet valve 8. The inlet ends of all the first hydrogen inlet pipes 9 and the second hydrogen inlet pipes 17 are equipped with a solenoid valve 5. The solenoid valve 5 opens when hydrogen is absorbed and closes when hydrogen is released. When connecting, since this embodiment uses two first hydrogen inlet pipes 9 and two second hydrogen inlet pipes 17, it can also be as follows Figure 2 As shown, two tee pipes 20 are prepared, one for connecting the two first hydrogen inlet pipes 9, and the other for connecting the two second hydrogen inlet pipes 17. When connecting, the two first hydrogen inlet pipes 9 or the second hydrogen inlet pipes 17 are respectively connected to the two ports of the tee pipe 20, and the third port of the tee pipe 20 is connected to the metal hose 6.

[0044] In order to facilitate the placement of the pot body 13, a skirt 15 is provided below the pot body 13, and the pot body 13 is mounted on the skirt 15. The design of the skirt 15 refers to the skirt of the tank in the chemical industry, and the usual skirt is a cylindrical structure.

[0045] When absorbing hydrogen, the hydrogen outlet valve 3 needs to be closed, the hydrogen inlet pipe is opened, and granular hydrogen storage material is added to the storage space. When hydrogen is transported through the hydrogen inlet pipes (the first hydrogen inlet pipe 9 and the second hydrogen inlet pipe 17), the flow rate of hydrogen can be determined according to the quality of the hydrogen storage material, as long as it can meet the requirements of blowing the hydrogen storage material; when adjusting the hydrogen flow rate, the main thing is to ensure that the hydrogen storage material can move in the storage space. For example, when the hydrogen storage material is blown to the top of the pot cover, the flow rate of hydrogen needs to be reduced; when the storage material is blown to the top of the pot cover, the flow rate of hydrogen needs to be reduced. When the hydrogen material is not blown away at the bottom of the pot body, the flow rate of hydrogen needs to be increased; when the hydrogen is blown onto the inner wall of the pot body 13, since the longitudinal cross-section of the pot body 13 is an arc-shaped structure, the pot body 13 as a whole is a curved surface structure, which can evenly disperse the hydrogen. At the same time, the contact between the hydrogen and the pot body 13 will also transfer the heat generated by the hydrogen storage material absorbing hydrogen in the storage space to the pot body 13. The pot body 13 will exchange the heat with the outside world. If necessary, the heat can be dissipated by blowing cold air onto the outer wall of the pot body.

[0046] When releasing hydrogen, the outer wall of the boiler is heated, the hydrogen outlet valve 3 is opened to release hydrogen, and the hydrogen inlet pipe is closed.

[0047] Example 2

[0048] This embodiment is further improved on the basis of embodiment 1. In order to facilitate the observation of hydrogen absorption effect and the checking of temperature, pressure, etc., the following technical solution is selected:

[0049] 1. An observation window can be installed on the pot cover 1. The design of the observation window can refer to the observation windows on various tanks or kettles in the chemical industry. Sometimes it is also called a sight window in the chemical industry.

[0050] 2. Install the pressure gauge 2 and the temperature gauge 22 on the top in sequence. When the pressure gauge 2 shows that the pressure is too high, you can reduce the pressure by reducing the amount of hydrogen fed into the hydrogen inlet pipe; when the temperature gauge 22 shows that the pressure is too high, you need to increase the heat exchange rate, such as lowering the temperature of the heat exchange medium in the jacket 14 or increasing the flow rate.

[0051] 3. For safety reasons, a safety valve 21 is installed on the pot cover 1. The safety valve 21 is also called a pressure relief valve in the reaction tank in the chemical industry. When the pressure in the pot body 13 is too high and there is no timely treatment, the safety valve 21 will automatically open to relieve the pressure. These technologies are very common in the chemical industry and will not be described in detail here.

[0052] Example 3

[0053] Based on Example 1, this embodiment further optimizes the matching relationship between the pot body 13 and the skirt 15, as described below:

[0054] In this embodiment, when the pot body 13 and the skirt 15 are installed, the pot body 13 is rotatably connected to the skirt 15, and a locking component is provided at the rotational connection to lock the pot body 13 on the skirt 15. Common locking components include lock buckles, lock nuts, latch bolts, etc. Figure 1 As shown, the locking assembly includes an angle bracket 10 and a stabilizing frame 12. The stabilizing frame 12 is fixed to the skirt 15. One side of the angle bracket 10 is fixed to the pot body 13 or the jacket 14, and a through hole is opened on the other side. A screw 11 is installed in the through hole, and a threaded hole is opened on the stabilizing frame 12 to threadably cooperate with the screw 11. When fixing, the screw 11 passes through the through hole and cooperates with the threaded hole, thereby fixing the angle bracket 10 on the stabilizing frame 12. When it is necessary to rotate the pot body 13, the screw 11 is removed.

[0055] Further explanation, the specific method of the rotation connection between the pot body 13 and the skirt 15 is as follows: Figure 4 As shown, a rotating shaft 19 is horizontally fixed to each side of the pot body 13. A corresponding rotating hole is provided in the skirt 15 for the rotating shaft 19 to independently pass through. The rotating shaft 19 rotates within the rotating hole. If the pot body 13 is too heavy, the rotating shaft 19 can be mounted on the skirt 15 via a bearing seat. There are many ways to install such a rotating connection, and we will not describe them in detail here. You can choose the one according to your needs later, as long as the rotating shaft 19 can rotate.

[0056] The pot body 13 and the skirt 15 are connected in a rotating manner. When the hydrogen storage material needs to be replaced, Figure 6As shown, it is only necessary to loosen the screws 11, remove the hydrogen outlet pipe 4 and the hydrogen inlet manifold on the pot cover 1, then rotate the pot body 13, turn the pot cover 1 downward, and the pot body 13 upward, and then the hydrogen storage material can be discharged through the hydrogen outlet 23. When the hydrogen storage material is hardened, it is also possible to fill the storage space with nitrogen or other inert gas through the hydrogen inlet pipe to loosen the hydrogen storage material and discharge the hydrogen storage material more smoothly from the hydrogen outlet 23. If the hardening is very serious, the pot cover 1 can be directly opened and replaced.

[0057] Example 4

[0058] This embodiment further improves the technology on the basis of embodiment 1. The improved technology mainly focuses on the heat exchange technology of the pot body 13. Heat exchange technology is actually very common in many fields, especially the heat exchange technology on reaction tanks or reactors in the chemical industry.

[0059] This embodiment mainly refers to the jacketed heat exchange technology in the chemical industry. Specifically, a jacket 14 is provided on the outside of the pot body 13. A sealed heat exchange chamber is formed between the jacket 14 and the pot body 13. A liquid outlet 18 communicating with the heat exchange chamber is installed at the upper end of the jacket 14, and a liquid inlet 16 communicating with the heat exchange chamber is installed at the lower end of the jacket 14.

[0060] At the same time, in order to further facilitate heat exchange, when applied, it is preferred to establish a cooling circulation system at the place where hydrogen is absorbed. When absorbing hydrogen, the cooling medium (usually cooling brine) is injected into the heat exchange chamber through the liquid inlet 16 through the cooling system, and the cooling medium after heat exchange flows back to the cooling system from the liquid outlet 18; similarly, it is preferred to establish a heating circulation system at the place where hydrogen needs to be discharged or on the transport vehicle, and the heating medium (usually steam) is injected into the heat exchange chamber through the liquid inlet 16 through the heating system, and the heating medium after heat exchange flows back to the heating system from the liquid outlet 18. Both the cooling circulation system and the heating circulation system can refer to the technology in the chemical industry.

[0061] The design of the jacket 14 can refer to the tank or kettle with a jacket in the chemical industry, which is very common in the chemical industry, is easy to design, and has a good heat exchange effect.

Claims

1. A hydrogen storage container comprising a pot body (13) and a pot cover (1) in a sealed fit, characterized in that: The pot body (13) and the pot cover (1) form a sealed storage space for storing granular hydrogen storage materials; The longitudinal cross-section of the pot body (13) is an arc-shaped structure, and the center of the arc is located between the pot body (13) and the pot cover (1); A hydrogen inlet pipe is sealed and passed through the pot cover (1); the hydrogen inlet end of the hydrogen inlet pipe is located outside the pot cover (1), and the hydrogen outlet end of the hydrogen inlet pipe is located in the storage space and faces the inner wall of the pot body (13); The hydrogen inlet pipe comprises a first hydrogen inlet pipe (9) and a second hydrogen inlet pipe (17) which are arranged vertically and spaced apart. The first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are both sealed and installed on the pot cover (1). The hydrogen inlet ends of the first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are located outside the pot cover (1). The hydrogen outlet ends of the first hydrogen inlet pipe (9) and the second hydrogen inlet pipe (17) are located in the storage space and face the inner wall of the pot body (13). The hydrogen outlet end of the second hydrogen inlet pipe (17) is lower than the hydrogen outlet end of the first hydrogen inlet pipe (9).

2. The hydrogen storage container according to claim 1, characterized in that: The storage space is filled with spherical granular hydrogen storage materials.

3. The hydrogen storage container according to claim 1 or 2, characterized in that: The roughness of the inner surface of the pot body (13) is less than 1 μm or any value between 1 and 10 μm.

4. The hydrogen storage container according to claim 1, characterized in that: A hydrogen outlet (23) is provided on the top of the pot cover (1), and a hydrogen outlet pipe (4) is sealed and installed at the hydrogen outlet (23).

5. The hydrogen storage container according to claim 3, characterized in that: There are multiple first hydrogen inlet pipes (9) and multiple second hydrogen inlet pipes (17).

6. The hydrogen storage container according to claim 5, characterized in that: The hydrogen inlet ends of all the first hydrogen inlet pipes (9) and the second hydrogen inlet pipes (17) are equipped with electromagnetic valves (5).

7. The hydrogen storage container according to claim 6, characterized in that: The air inlets of all the first hydrogen inlet pipes (9) are connected to the same first air supply branch pipe, and the air inlets of all the second hydrogen inlet pipes (17) are connected to the same second air supply branch pipe. The first air supply branch pipe and the second air supply branch pipe are connected through a metal hose (6), and the air inlet ends of the two metal hoses (6) are connected to the hydrogen inlet main pipe through a three-way joint (7).

8. The hydrogen storage container according to claim 7, characterized in that: A skirt seat (15) is provided below the pot body (13), and the pot body (13) is mounted on the skirt seat (15).

9. The hydrogen storage container according to claim 8, characterized in that: A skirt seat (15) is provided below the pot body (13), the pot body (13) is rotatably connected to the skirt seat (15), and a locking assembly for locking the pot body (13) to the skirt seat (15) is provided at the hinge.

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