Plugging mechanism for water tank of ice maker

Abstract

The utility model relates to the technical field of small household appliances of water production machines, in particular to a plugging mechanism for a water tank of a refrigerating machine, which comprises a connecting cylinder fixedly connected to a water inlet of a transfer water tank, a plugging assembly sliding in the connecting cylinder, and a connecting sleeve fixedly connected in the connecting cylinder and used for being matched with a sliding pipe, a plugging plate is fixedly connected to the position, close to the top side, of the inner wall of the connecting cylinder, a flow limiting hole for water to flow is formed in the plugging plate, and the plugging assembly is located below the plugging plate and is coaxial with the flow limiting hole. The transfer water tank has the advantages that the problem of overflow caused by insufficient water or excessive water in the transfer water tank is solved, and accordingly the water flow in the transfer water tank is controlled.

Description

Technical Field

[0001] This application relates to the technical field of water purifiers and small household appliances, and in particular to a sealing mechanism for a water tank of a refrigeration unit. Background Technology

[0002] Cooling water dispensers typically use an evaporator wrapped around the outer wall of the cooling tank or immersed in the water inside the tank to cool the water. When the user presses the dispensing button, cold water will flow out of the tank.

[0003] In related technologies, ice-making water dispensers typically include an internally installed ambient temperature water tank for supplying room temperature water, a transfer water tank located below the ambient temperature water tank for water transfer, a first cold tank located on one side of the ambient temperature water tank for ice making, a second cold tank located below the transfer water tank for cooling water, a compressor, ice-making components, and a heating component. The outlet of the ambient temperature water tank is connected to the inlet of the transfer water tank. During the ice-making / water-making process, water from the ambient temperature water tank first flows into the transfer water tank, and then from the transfer water tank into the cooling / ice-making cold tank, thus cooperating with the compressor and other components to achieve the function of ice making or cooling water.

[0004] Regarding the aforementioned technologies, the transfer water tank is prone to overflow due to insufficient or excessive water volume. Therefore, there is a need to provide a mechanism that can control the water flow rate within the transfer water tank. Utility Model Content

[0005] In order to improve the problem of overflow caused by insufficient or excessive water in the transfer water tank, and to control the water flow in the transfer water tank, this application provides a sealing mechanism for the water tank of an ice maker.

[0006] The sealing mechanism for the water tank of an ice maker provided in this application adopts the following technical solution:

[0007] A sealing mechanism for an ice maker water tank includes a connecting cylinder fixedly connected to the inlet of a transfer water tank, a sealing component sliding within the connecting cylinder, and a connecting sleeve fixedly connected within the connecting cylinder for engaging with the sealing component. A sealing plate is fixedly connected to the inner wall of the connecting cylinder near the top side. The sealing plate has a flow-limiting hole for water supply. The sealing component is located below the sealing plate and is coaxially arranged with the flow-limiting hole.

[0008] By adopting the above technical solution, when the flow rate of water flowing from the ambient temperature water tank into the transfer water tank is large, the water level in the transfer water tank rises to a certain height. The sealing component slides upward within the connecting cylinder due to buoyancy, approaching or blocking the flow-limiting orifice, thereby limiting the water flow and preventing the transfer water tank from overflowing due to excessive water intake. The sealing mechanism is equivalent to setting a regulating valve at the water inlet, which can automatically adjust the water intake according to the water level, keeping the water flow inside the ice-making water dispenser in a relatively stable state.

[0009] Furthermore, the sealing assembly includes a sliding tube that passes through and slides within the connecting sleeve, a sealing block coaxially disposed at the top of the sliding tube and used to abut against the flow-limiting hole position of the sealing plate, and a floating component coaxially disposed at the bottom of the sliding tube, the floating component being located within the transfer water tank.

[0010] By adopting the above technical solution, the floating component is located inside the transfer tank. When the water level in the tank changes, the floating component floats up and down accordingly. The sealing block is used to block the flow-limiting orifice of the sealing plate. The upward or downward movement of the sealing block can precisely control the opening and closing degree of the flow-limiting orifice, thereby dynamically adjusting the inflow rate according to the actual water level in the transfer tank. When the water level rises to near or reaches the set upper limit, the floating component drives the sealing block to move upward. The sealing block blocks or reduces the flow area of ​​the flow-limiting orifice, preventing excessive water inflow and preventing the transfer tank from overflowing. When the water level in the tank is low, the floating component sinks, and the sealing block moves away from the flow-limiting orifice of the sealing plate, ensuring that water can smoothly enter the transfer tank through the flow-limiting orifice, maintaining the water supply balance in the tank, and ensuring sufficient water supply during ice making or refrigeration.

[0011] Furthermore, the sealing block has an insertion part for being inserted into the sliding tube, a limiting part for abutting against the upper end of the sliding tube, and an abutting part for abutting against the sealing plate. The insertion part, the limiting part, and the abutting part are coaxially arranged and integrally connected. The outer diameter of the limiting part is larger than the outer diameter of the insertion part.

[0012] By adopting the above technical solution, the outer diameter of the limiting part is larger than the outer diameter of the insertion part, and the limiting part abuts against the upper end of the sliding tube, ensuring that the sealing block is always kept in a proper position, preventing the sealing block from being over-inserted into the sliding tube, which could lead to connection failure or malfunction. The abutting part is used to abut against the sealing plate, controlling the opening and closing degree of the flow-limiting orifice through this abutment. The insertion part is inserted into the sliding tube to prevent the sealing block from shifting horizontally, ensuring that the sealing block can be aligned with the flow-limiting orifice of the sealing plate, thus guaranteeing the accuracy of the sealing action.

[0013] Furthermore, the outer diameter of the abutting portion gradually decreases from one end of the limiting portion to the end near the sealing plate in order to extend into the flow-limiting hole.

[0014] By adopting the above technical solution, the outer diameter of the contact part gradually decreases from one end of the limiting part to the end near the sealing plate. This allows the contact part to achieve different degrees of sealing of the flow-limiting orifice depending on the depth of insertion. Initially, as the water level rises, the contact part extends slightly, slightly reducing the flow area of ​​the flow-limiting orifice and achieving fine-tuning of the water flow. As the water level continues to rise, the contact part extends further, further reducing the flow area of ​​the flow-limiting orifice. When the predetermined water level is reached, the flow-limiting orifice is completely sealed. This strictly limits the flow rate of water into the transfer tank, thereby achieving precise and gradual water flow control and effectively addressing the adjustment needs of the transfer tank's water volume under different operating conditions.

[0015] Furthermore, the sliding tube has a limiting protrusion on its outer peripheral wall near the top end for cooperating with the connecting sleeve.

[0016] By adopting the above technical solution, a limiting protrusion is set on the outer peripheral wall of the sliding tube near the top, cooperating with the connecting sleeve to limit the upward and downward sliding range of the sliding tube. When the water flow impact is too large or the equipment is vibrated, it can prevent the sliding tube from detaching from the connecting sleeve. The limiting protrusion also prevents the sealing component from failing and thus failing to properly control the water flow.

[0017] Furthermore, the floating component includes a floating base plate, an arched cover circumferentially disposed outside the floating base plate, and a connecting column coaxially disposed on the upper side of the floating base plate for connecting with the sliding tube. The connecting column is inserted into and fixedly connected to the sliding tube to fix the floating base plate to the lower end of the sliding tube. The arc surface of the arched cover is arranged upward.

[0018] By adopting the above technical solution, the arched surface of the dome is set upwards, thus forming a bowl-like structure similar to an inverted bowl, creating a unique pressure environment in the water. At the bottom of the dome (near the floating base), the water pressure is relatively high, while at the top (the highest point of the arch), the water pressure is relatively low. This pressure difference results in a greater upward buoyancy force on the dome. As the water level rises, the pressure difference on the dome further increases, and the buoyancy also increases. This characteristic of buoyancy increasing rapidly with rising water levels allows the floating components to respond more sensitively to changes in water level. When the water level in the transfer tank shows a slight upward trend, the dome can quickly sense the increase in buoyancy, thereby causing the sliding pipe and sealing block to adjust in time, effectively preventing the water level from becoming too high and enabling rapid and precise control of the water flow in the transfer tank.

[0019] Furthermore, the arched cover includes an outer cover ring plate and an arched ring plate fixedly connected between the top side of the outer cover ring plate and the outer edge of the floating bottom plate. The inner wall of the arched ring plate, the outer wall of the sliding pipe, and the upper side of the floating bottom plate together form a temporary storage tank for water supply.

[0020] By adopting the above technical solution, a temporary storage tank is formed by utilizing the space between the arched cover, sliding pipe, and floating base plate, achieving the added water storage function without increasing the overall volume of the equipment. The temporary storage tank can buffer against short-term fluctuations in the water level of the transfer tank. When water rapidly flows into the transfer tank, causing a momentary rise in water level, some water enters the temporary storage tank. When the ice maker just starts filling with water or when the water flow in the pipes connected to the transfer tank of other equipment suddenly changes, the temporary storage tank temporarily stores this excess water, preventing the rapid rise in water level from causing excessive impact on the sealing components, resulting in a smoother water level change and helping to maintain a relatively stable water level in the transfer tank.

[0021] Furthermore, the arched ring plate is provided with a water passage gap that cooperates with the temporary storage tank.

[0022] By adopting the above technical solution, the water passage gap allows the temporary storage tank to more efficiently buffer sudden changes in the water level within the transfer tank. When a large amount of water rapidly flows into the transfer tank, causing a sharp rise in the water level, some of the water can quickly enter the temporary storage tank through the water passage gap for temporary storage, alleviating the pressure of the rapid rise in water level. Similarly, when the water level drops rapidly, the water in the temporary storage tank can also flow back in time through this gap, preventing large fluctuations in the water level within the transfer tank. This makes the buffering of water level fluctuations by the temporary storage tank more timely and effective, further ensuring the relative stability of the water level within the transfer tank.

[0023] Furthermore, the outer side of the connecting cylinder is provided with a sealing ring for cooperating with the water inlet of the transfer water tank, and the outer peripheral wall of the connecting cylinder near the top end is provided with a step for the sealing ring to be inserted.

[0024] By adopting the above technical solution, the sealing ring can effectively fill the gap between the connecting cylinder and the inlet of the transfer water tank. During the operation of the ice maker, water will continuously flow through the transfer water tank. The sealing ring fits tightly between the connecting cylinder and the inlet of the transfer water tank, forming a reliable sealing barrier to prevent water from leaking out from the connection and ensure that the water flows in the transfer water tank and related components according to the predetermined path.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The coordinated operation of each component of the sealing assembly, the floating part drives the sealing block to precisely adjust the opening and closing degree of the flow limiting hole of the sealing plate according to the water level change, the gradual sealing design of the contact part and the limiting convex ring limit the sliding range of the sliding tube, and achieve precise and adaptive water flow adjustment according to the water level in the transfer water tank. It can effectively cope with the water demand under different working conditions, prevent excessive water overflow or insufficient water from affecting the ice making and refrigeration water process, and maintain stable water flow.

[0027] 2. Utilizing the buoyancy characteristics formed by the special structure of the arched cover, it can respond sensitively to changes in water level and quickly adjust the action of the sealing components; the setting of the temporary storage tank and the water passage gap buffers the water level fluctuations in the transfer water tank, further ensuring the relative stability of the water level, so that the water flow inside the entire ice maker is in a stable state, providing stable operating conditions for ice making, cooling water and other working processes, reducing the adverse effects of unstable water level on the equipment, and extending the service life of the equipment;

[0028] 3. The sealing ring and corresponding stepped structure on the outside of the connecting cylinder effectively fill the gap between the connecting cylinder and the water inlet of the transfer tank, forming a reliable sealing barrier to prevent water leakage at the connection point and ensure that the water flows along the predetermined path. This not only prevents water leakage from affecting the normal operation of the equipment, but also ensures the accuracy of water flow control, which is conducive to maintaining the overall good performance of the equipment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the ice maker's water tank and sealing mechanism.

[0030] Figure 2 This is an exploded view of the sealing mechanism of the water tank in an ice maker.

[0031] Figure 3 This is a cross-sectional schematic diagram of the water tank and sealing mechanism of an ice maker.

[0032] Figure 4 This is a schematic diagram of the overall structure of the floating component.

[0033] Explanation of reference numerals in the attached drawings: 1. Connecting cylinder; 11. Connecting lug; 12. Sealing ring; 13. Step; 14. Sealing plate; 141. Flow limiting hole; 2. Connecting sleeve; 3. Sealing assembly; 31. Sliding tube; 311. Limiting protrusion ring; 32. Sealing block; 321. Abutting part; 322. Limiting part; 323. Insertion part; 33. Floating part; 331. Floating bottom plate; 332. Arched cover; 3321. Outer cover ring plate; 3322. Arched ring plate; 333. Connecting column; 4. Ice maker water tank; 41. Box body; 42. Top cover; 421. Water inlet. Detailed Implementation

[0034] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1-4 The present application will be further described in detail with reference to the embodiments.

[0035] This application discloses a sealing mechanism for the water tank of an ice maker.

[0036] Reference Figure 1 and Figure 2The sealing mechanism of the ice maker's water tank includes a connecting cylinder 1, a connecting sleeve 2, and a sealing assembly 3. The ice maker's water tank 4 includes a tank body 41 and a top cover 42. The top cover 42 is fitted onto the tank body 41 and is detachably connected to the tank body 41 via a snap-fit. The connecting cylinder 1 is used to connect to the top cover 42 of the water tank, and the connecting sleeve 2 is installed inside the connecting cylinder 1 and allows the sealing assembly 3 to slide and connect.

[0037] The top cover 42 has a water inlet 421 for water supply, and the connecting cylinder 1 is fixedly connected to the water inlet 421 of the top cover 42. Multiple connecting ears 11 are integrally connected to the outer wall of the connecting cylinder 1. In this embodiment, the number of connecting ears 11 is preferably three, and each connecting ear 11 is circumferentially spaced on the connecting cylinder 1. The connecting cylinder 1 is fixedly connected to the top cover 42 of the water tank through each connecting ear 11. The connecting sleeve 2 is installed inside the connecting cylinder 1 and threadedly connected to the connecting cylinder 1.

[0038] A sealing ring 12 is fitted onto the outer peripheral wall of the connecting cylinder 1. The sealing ring 12 is located near the top of the connecting cylinder 1 to mate with the water inlet 421 of the top cover 42. The connecting cylinder 1 has a step 13 on its outer peripheral wall for the sealing ring 12 to be inserted. A sealing plate 14 is integrally connected to the inner wall of the connecting cylinder 1 near the top side. The sealing plate 14 has a flow-limiting hole 141 for water supply at the central axis position.

[0039] Reference Figure 2 and Figure 3 The sealing assembly 3 includes a sliding tube 31, a sealing block 32, and a floating element 33. The sliding tube 31 passes through and slides within the connecting sleeve 2. A limiting protrusion 311 for cooperating with the connecting sleeve 2 is integrally connected to the outer peripheral wall of the sliding tube 31 near its top end. After the sliding tube 31 is inserted into the connecting sleeve 2 from the upper side, the lower side of the limiting protrusion 311 abuts against the upper edge of the connecting sleeve 2, thereby preventing the sliding tube 31 from coming out of the connecting sleeve 2.

[0040] In this embodiment, the sealing block 32 is preferably made of silicone with a certain deformation capability. The sealing block 32 includes an abutment portion 321, a limiting portion 322, and an insertion portion 323, which are coaxially arranged and integrally connected from top to bottom. The insertion portion 323 is inserted into the sliding tube 31. The outer diameter of the limiting portion 322 is larger than the outer diameter of the insertion portion 323. The lower edge of the limiting portion 322 can abut against the upper end face of the sliding tube 31 to prevent the sealing block 32 from being over-inserted. The abutment portion 321 is used to cooperate with the water inlet 421 of the sealing plate 14. The outer diameter of the abutment portion 321 gradually decreases from one end of the limiting portion 322 to the end near the sealing plate 14. The abutment portion 321 is generally conical to extend into the flow-limiting hole 141, so that when the abutment portion 321 approaches and extends into the flow-limiting hole 141, it can achieve different degrees of sealing of the flow-limiting hole 141 according to the different depths of insertion.

[0041] The floating component 33 includes a floating base plate 331, an arched cover 332, and a connecting column 333, all coaxially arranged and integrally connected. The arched cover 332 is circumferentially located outside the floating base plate 331 with its arc surface facing upwards. The connecting column 333 is located at the central axis position on the upper side of the floating base plate 331 and is inserted into and threadedly connected to the lower end of the sliding tube 31 for mounting the floating component 33 below the sliding tube 31. The arc surface of the arched cover 332 faces upwards, thus forming an inverted bowl-like structure, creating a special pressure environment in the water. At the bottom of the arched cover 332 (near the floating base plate 331), the water pressure is relatively high, while at the top of the arched cover 332 (the highest point of the arc surface), the water pressure is relatively low. This pressure difference results in a greater upward buoyancy force on the arched cover 332. As the water level rises, the pressure difference between the water and the arched cover 332 further increases, and the buoyancy also increases accordingly. This characteristic of buoyancy increasing rapidly with rising water level allows the floating component 33 to respond more sensitively to changes in water level. When the water level in the transfer tank shows a slight upward trend, the arched cover 332 can quickly sense the increase in buoyancy, thereby causing the sliding pipe 31 and the sealing block 32 to adjust in time, effectively preventing the water level from becoming too high and enabling rapid and precise control of the water flow in the transfer tank.

[0042] Combination Figure 4 The arched cover 332 includes an outer cover ring plate 3321 and an arched ring plate 3322 integrally connected between the top side of the outer cover ring plate 3321 and the outer edge of the floating bottom plate 331. The inner wall of the arched ring plate 3322, the outer wall of the sliding pipe 31, and the upper side of the floating bottom plate 331 together form a temporary storage tank for water supply. Symmetrical water passage gaps that cooperate with the temporary storage tank are provided on both sides of the arched ring plate 3322.

[0043] A temporary storage tank is formed by utilizing the space between the arched cover 332, the sliding pipe 31, and the floating base plate 331, thus adding a water storage function without increasing the overall volume of the equipment. The temporary storage tank can buffer against short-term fluctuations in the water level of the transfer tank. When water flows rapidly into the transfer tank, causing a sudden rise in the water level, some water enters the temporary storage tank. When the ice maker starts filling with water or when the water flow in the pipes connecting other equipment to the transfer tank suddenly changes, the temporary storage tank temporarily stores this excess water, preventing the rapid rise in water level from causing excessive impact on the sealing component 3, resulting in a smoother water level change and helping to maintain a relatively stable water level in the transfer tank. The water passage gap allows the temporary storage tank to more efficiently buffer against sudden changes in the water level in the transfer tank.

[0044] When a large amount of water flows rapidly into the transfer tank, causing the water level to rise sharply, some of the water can quickly enter the temporary storage tank through the water passage gap for temporary storage, relieving the pressure of the rapid rise in water level. Similarly, when the water level drops rapidly, the water in the temporary storage tank can also flow back in time through this gap, avoiding large fluctuations in the water level in the transfer tank. This makes the buffering of water level fluctuations in the temporary storage tank more timely and effective, further ensuring the relative stability of the water level in the transfer tank.

[0045] The implementation principle of the sealing mechanism for an ice maker water tank according to an embodiment of this application is as follows: The sealing mechanism for the ice maker water tank includes a connecting cylinder 1, a connecting sleeve 2, and a sealing component 3. The connecting cylinder 1 is fixedly connected to the top cover 42 of the water tank via a connecting lug 11, and the connecting cylinder 1 is fixed at the water inlet 421 of the top cover 42. The sealing ring 12 sleeved on its outer peripheral wall is located near the top end, and cooperates with the water inlet 421 of the top cover 42. The sealing ring 12 is inserted and fixed by a step 13 provided on the outer peripheral wall of the connecting cylinder 1. The inner wall of the connecting cylinder 1 near the top side has a sealing plate 14 with a flow limiting hole 141.

[0046] The sliding tube 31 of the sealing assembly 3 is inserted and slides within the connecting sleeve 2. Its limiting protrusion 311, near the top outer peripheral wall, abuts against the upper edge of the connecting sleeve 2 after the sliding tube 31 is inserted from the upper side, preventing the sliding tube 31 from dislodging. The insertion part 323 of the sealing block 32 is inserted into the sliding tube 31. The limiting part 322 prevents the sealing block 32 from being over-inserted. The abutting part 321 can cooperate with the inlet 421 of the sealing plate 14 and can extend into the flow-limiting hole 141, achieving different degrees of sealing of the flow-limiting hole 141 depending on the depth of insertion. The floating component 33 is threadedly connected to the lower end of the sliding tube 31 via a connecting post 333. Its arched cover 332 and other structures create a special pressure environment, facilitating response to water level changes.

[0047] The arched cover 332 of the floating component 33 has an inverted bowl-shaped structure. The water pressure at the bottom is high and the water pressure at the top is low. The pressure difference causes the arched cover 332 to be subject to upward buoyancy, and the buoyancy increases rapidly as the water level rises. When the water level in the transfer tank rises slightly, it can drive the sliding pipe 31 and the sealing block 32 to adjust in time to prevent the water level from being too high and achieve rapid and accurate control of the water flow in the transfer tank.

[0048] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing mechanism for the water tank of an ice maker, characterized in that: The device includes a connecting cylinder (1) fixedly connected to the inlet (421) of the transfer water tank, a sealing assembly (3) sliding inside the connecting cylinder (1), and a connecting sleeve (2) fixedly connected inside the connecting cylinder (1) and used to cooperate with the sealing assembly (3). A sealing plate (14) is fixedly connected to the inner wall of the connecting cylinder (1) near the top side. The sealing plate (14) has a flow-limiting hole (141) for water supply. The sealing assembly (3) is located below the sealing plate (14) and is coaxially arranged with the flow-limiting hole (141).

2. The sealing mechanism for an ice maker water tank according to claim 1, characterized in that: The sealing assembly (3) includes a sliding tube (31) that passes through and slides within the connecting sleeve (2), a sealing block (32) coaxially disposed at the top of the sliding tube (31) and used to abut against the flow-limiting hole (141) of the sealing plate (14), and a floating element (33) coaxially disposed at the bottom of the sliding tube (31), the floating element (33) being located inside the transfer water tank.

3. The sealing mechanism for an ice maker water tank according to claim 2, characterized in that: The sealing block (32) has a plug-in portion (323) for being inserted into the sliding tube (31), a limiting portion (322) for abutting against the upper end of the sliding tube (31), and an abutting portion (321) for abutting against the sealing plate (14). The plug-in portion (323), the limiting portion (322), and the abutting portion (321) are coaxially arranged and integrally connected. The outer diameter of the limiting portion (322) is larger than the outer diameter of the plug-in portion (323).

4. The sealing mechanism for an ice maker water tank according to claim 3, characterized in that: The outer diameter of the abutment portion (321) gradually decreases from one end of the limiting portion (322) to the end near the sealing plate (14) to allow it to extend into the flow-limiting hole (141).

5. The sealing mechanism for an ice maker water tank according to claim 2, characterized in that: The sliding tube (31) has a limiting protrusion (311) on its outer peripheral wall near the top for cooperating with the connecting sleeve (2).

6. The sealing mechanism for an ice maker water tank according to claim 2, characterized in that: The floating component (33) includes a floating base plate (331), an arched cover (332) circumferentially disposed outside the floating base plate (331), and a connecting column (333) coaxially disposed on the upper side of the floating base plate (331) and used to connect with the sliding tube (31). The connecting column (333) is inserted into and fixedly connected to the sliding tube (31) to fix the floating base plate (331) at the lower end of the sliding tube (31). The arc surface of the arched cover (332) is arranged upward.

7. The sealing mechanism for an ice maker water tank according to claim 6, characterized in that: The arched cover (332) includes an outer cover ring plate (3321) and an arched ring plate (3322) fixedly connected between the top side of the outer cover ring plate (3321) and the outer edge of the floating bottom plate (331). The inner wall of the arched ring plate (3322), the outer wall of the sliding pipe (31) and the upper side of the floating bottom plate (331) together form a temporary storage tank for water supply.

8. The sealing mechanism for an ice maker water tank according to claim 7, characterized in that: The arched ring plate (3322) is provided with a water passage gap that cooperates with the temporary storage tank.

9. The sealing mechanism for an ice maker water tank according to claim 1, characterized in that: The outer side of the connecting cylinder (1) is provided with a sealing ring (12) for cooperating with the water inlet (421) of the transfer water tank, and the outer peripheral wall of the connecting cylinder (1) near the top is provided with a step (13) for the sealing ring (12) to be inserted.

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