Multistage reverse osmosis membrane desalting equipment

Abstract

The utility model relates to the technical field of reverse osmosis equipment, and discloses multistage reverse osmosis membrane desalting equipment which comprises a frame, a plurality of pressure vessel pipes are mounted in the frame, a plurality of reverse osmosis membranes are arranged in the pressure vessel pipes, one side of the top of the frame is fixedly connected with a first fixing frame, and the other side of the top of the frame is fixedly connected with a second fixing frame. A water inlet barrel is fixedly connected to the top of the first fixing frame, a mounting shell is fixedly connected to the inner wall of the water inlet barrel, a filter screen is detachably connected to the inner wall of the mounting shell, a fixing plate is fixedly connected to the inner wall of the water inlet barrel, a fixing rod is rotatably connected to the bottom of the fixing plate, and an impeller is fixedly connected to the bottom of the fixing rod. According to the utility model, the brush continuously cleans the outer surface of the filter screen in the rotating process, so that impurities are prevented from being accumulated to block the filter screen, the water flow is kept smooth, the water flow reduction and even interruption caused by the blockage of the filter screen can be avoided, and the continuous proceeding of the whole desalting process is maintained.

Description

Technical Field

[0001] The utility model relates to the technical field of reverse osmosis equipment, in particular to a multi-stage reverse osmosis membrane desalination equipment. Background Art

[0002] With the development of industry and the improvement of people's living standards, the demand for water resources is increasing, and the requirements for water quality are also becoming increasingly higher. In industries such as electronics, pharmaceuticals, and chemicals, high-purity water is required. Reverse osmosis technology, as a highly efficient method for desalination and water purification, has been widely used. Multi-stage reverse osmosis membrane desalination equipment can gradually improve water purity through multi-stage reverse osmosis membrane treatment, meeting the high-quality water needs of different industries.

[0003] At present, there are many multi-stage reverse osmosis membrane desalination equipment on the market. These equipment usually include main components such as a frame, a pressure vessel tube, a reverse osmosis membrane, and a high-pressure pump. After the incoming water is initially filtered, it is pressurized by a high-pressure pump and transported to the reverse osmosis membrane in the pressure vessel tube for desalination treatment. The filter screen serves as a preliminary filtering component to intercept larger particles of impurities in the water and prevent them from entering the pressure vessel tube. However, in the prior art, the filter screen is easily clogged by impurities during use, resulting in a reduction in water flow and affecting the normal operation of the equipment. Once the filter screen is clogged, not only does it need to be shut down for cleaning or replacement of the filter screen, which increases the maintenance cost and downtime of the equipment, but it also damages the reverse osmosis membrane, reducing the service life and desalination efficiency of the equipment. To this end, a multi-stage reverse osmosis membrane desalination equipment is proposed to solve the above problems. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a multi-stage reverse osmosis membrane desalination equipment, which aims to improve the problem that the filter screen is easily clogged by impurities during use, resulting in reduced water flow and affecting the normal operation of the equipment.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a multi-stage reverse osmosis membrane desalination equipment, comprising a frame, a plurality of pressure vessel tubes are installed inside the frame, a plurality of reverse osmosis membranes are arranged inside the pressure vessel tubes, a fixing frame 1 is fixedly connected to one side of the top of the frame, a water inlet cylinder is fixedly connected to the top of the fixing frame 1, a mounting shell is fixedly connected to the inner wall of the water inlet cylinder, a filter screen is detachably connected to the inner wall of the water inlet cylinder, a fixing plate is fixedly connected to the bottom of the fixing plate, a fixing rod is rotatably connected to the bottom of the fixing rod, an impeller is fixedly connected to the bottom of the impeller is fixedly connected to the fixing shell, a plurality of springs 1 are fixedly connected to the inner wall of the fixing shell, a connecting plate is fixedly connected to the bottom of the spring 1, a plurality of brushes are fixedly connected to the bottom of the connecting plate, a high-pressure pump is installed on the outside of the fixing frame 1, an input end of the high-pressure pump is fixedly connected to an input pipe, an output end of the high-pressure pump is fixedly connected to an output pipe, a disassembly assembly is provided on the outside of the water inlet cylinder, and the disassembly assembly is used for disassembling the filter screen.

[0006] As a further description of the above technical solution:

[0007] The disassembly assembly includes two fixing frames three, one side of each of the fixing frames three is fixedly connected to the outside of the water inlet cylinder, the top of the fixing frame three is fixedly connected to a connecting rod, one end of the connecting rod is fixedly connected to a movable plate, the outer side of the movable plate is slidably connected to a connecting shell, the outer sides of the filter screen are fixedly connected to connecting blocks, and a slot is provided at the bottom of the connecting block.

[0008] As a further description of the above technical solution:

[0009] The shape of the connecting shell matches the shape of the card slot, the outer sides of the two connecting shells are respectively engaged with the corresponding card slots, and the outer sides of the two connecting shells are fixedly connected with a push plate.

[0010] As a further description of the above technical solution:

[0011] The outer sides of the two connecting rods are each sleeved with a spring 2, one end of the two springs 2 is fixedly connected to the bottom of the corresponding connecting shell, and the other end of the two springs 2 is fixedly connected to the top of the corresponding fixing frame 3.

[0012] As a further description of the above technical solution:

[0013] The plurality of brushes are all made of flexible material, and the bottom of the brush fits the outer surface of the filter.

[0014] As a further description of the above technical solution:

[0015] The end of the input pipe away from the water inlet pipe is connected to the bottom of the water inlet cylinder, and the end of the output pipe away from the high-pressure pump is fixedly connected to the water inlet pipe, and the water inlet pipe is connected to the pressure vessel pipe through a pipeline.

[0016] As a further description of the above technical solution:

[0017] The outer side of the frame is fixedly connected with a second fixing frame, the top of the second fixing frame is fixedly connected with the bottom of the water inlet pipe, and the outer side of the connecting plate is slidably connected to the inner wall of the fixed shell.

[0018] As a further description of the above technical solution:

[0019] One end of the plurality of pressure vessel tubes away from the water inlet pipe is fixedly connected with a water outlet pipe.

[0020] As a further description of the above technical solution:

[0021] A sealing ring is fixedly connected to the outer side of the filter screen, a sealing groove is opened on the inner side of the mounting shell, and the sealing ring is matched with the sealing groove.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the present invention, water impacts the impeller to rotate, and the impeller drives the fixed shell to rotate, and then the connecting plate rotates, thereby driving the brush to rotate. During the rotation process, the brush continuously cleans the outer surface of the filter screen to prevent impurities from accumulating and clogging the filter screen. Under the elastic action of spring 1, the connecting plate drives the brush to always closely fit the filter screen to ensure the cleaning effect, thereby effectively preventing the filter screen from being blocked and ensuring smooth water flow. It can avoid the reduction or even interruption of water flow caused by the blockage of the filter screen, thereby maintaining the continuity of the entire desalination process.

[0024] 2. In this utility model, the connecting shell is disengaged from the slot at the bottom of the connecting block. Then, the handle on the filter is pulled to release the filter from the mounting shell, allowing for quick maintenance or replacement of the filter. Compared with bolt fixing, this method is faster, more rational, and easier to use, reducing the loss of desalination efficiency caused by equipment downtime. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional diagram of a multi-stage reverse osmosis membrane desalination device proposed by the present utility model;

[0026] Figure 2 This is a schematic diagram of the installation shell structure of a multi-stage reverse osmosis membrane desalination equipment proposed by the utility model;

[0027] Figure 3This is a schematic diagram of the outlet pipe structure of a multi-stage reverse osmosis membrane desalination equipment proposed by the utility model;

[0028] Figure 4 This is a cross-sectional view of the water inlet cylinder of a multi-stage reverse osmosis membrane desalination device proposed in the present invention;

[0029] Figure 5 This is a schematic diagram of the connecting plate structure of a multi-stage reverse osmosis membrane desalination equipment proposed by the utility model;

[0030] Figure 6 for Figure 4 A in the enlarged view.

[0031] Legend:

[0032] 1. Frame; 2. Pressure vessel tube; 3. Fixed frame 1; 4. Water inlet cylinder; 5. Input pipe; 6. High-pressure pump; 7. Output pipe; 8. Water inlet pipe; 9. Fixed frame 2; 10. Water outlet pipe; 11. Mounting shell; 12. Filter screen; 13. Fixed plate; 14. Fixed rod; 15. Impeller; 16. Fixed shell; 17. Spring 1; 18. Connecting plate; 19. Brush; 20. Sealing ring; 21. Sealing groove; 22. Connecting block; 23. Connecting shell; 24. Moving plate; 25. Connecting rod; 26. Spring 2; 27. Push plate; 28. Fixed frame 3; 29. Slot. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Reference Figure 1 , Figure 4 and Figure 5, the utility model provides an embodiment: a multi-stage reverse osmosis membrane desalination equipment, including a frame 1, a plurality of pressure vessel tubes 2 are installed inside the frame 1, a plurality of reverse osmosis membranes are arranged inside the pressure vessel tube 2, a top side of the frame 1 is fixedly connected to a fixing frame 3, the top of the fixing frame 3 is fixedly connected to a water inlet cylinder 4, the inner wall of the water inlet cylinder 4 is fixedly connected to a mounting shell 11, the inner wall of the mounting shell 11 is detachably connected to a filter screen 12, the inner wall of the water inlet cylinder 4 is fixedly connected to a fixing plate 13, the bottom of the fixing plate 13 is rotatably connected to a fixing rod 14, the bottom of the fixing rod 14 is fixedly connected to an impeller 15, the bottom of the impeller 15 is fixedly connected to a fixing shell 16, the inner wall of the fixing shell 16 is fixedly connected to a plurality of springs 17, the bottom of the spring 17 is fixedly connected to a connecting plate 18, the bottom of the connecting plate 18 is fixedly connected to a plurality of brushes 19, the plurality of brushes 19 are all made of flexible material, and the bottom of the brush 19 fits with the outer surface of the filter screen 12.

[0035] Specifically, the frame 1 provides stable structural support for the entire device, and the pressure vessel tube 2 provides installation space for the reverse osmosis membrane, allowing multiple reverse osmosis membranes to be arranged in an orderly manner within the frame to achieve a multi-stage reverse osmosis desalination process. The fixing frame 3 secures the water inlet cylinder 4 and the high-pressure pump 6, providing a stable installation location for the water inlet cylinder 4 and the high-pressure pump 6. The water inlet cylinder 4 provides a location for the installation of components such as the filter screen 12, the impeller 15, and the fixing plate 13. The mounting housing 11 ensures that the filter screen 12 can be securely installed within the water inlet cylinder 4, achieving preliminary filtration of the incoming water. The filter screen 12 filters larger particles of impurities in the water, preventing these impurities from entering the subsequent reverse osmosis membrane system, avoiding damage to the reverse osmosis membrane, and extending the service life of the reverse osmosis membrane. The fixing plate 13 provides a stable installation location for the fixing rod 14, ensuring that the impeller 15 can rotate normally within the water inlet cylinder 4. The fixing rod 14 connects the impeller 15 to the fixing plate 13, achieving a rotational connection between the impeller 15 and the fixing plate 13, allowing the impeller 15 to rotate freely under the action of the water flow. The impeller 15 rotates under the impact of the water flow, providing a power source for the rotation of the brush 19. No additional power device is required, saving energy. The fixed shell 16 provides an installation position for the spring 17 and the connecting plate 18. The spring 17 uses elasticity to enable the connecting plate 18 to drive the brush 19 to always fit tightly against the filter 12. The connecting plate 18 connects the brush 19 to the spring 17 so that the elastic force of the spring 17 can be transmitted to the brush 19, achieving a tight fit of the brush 19. The brush 19 made of flexible material rotates under the drive of the impeller 15, continuously cleaning the outer surface of the filter 12, preventing impurities from accumulating and clogging the filter 12, ensuring smooth water flow, and ensuring stable operation of the equipment.

[0036] Reference Figure 2 , Figure 4 and Figure 6A disassembly assembly is provided on the outside of the water inlet cylinder 4, and the disassembly assembly is used to disassemble the filter 12. The disassembly assembly includes two fixing frames three 28, one side of the two fixing frames three 28 are fixedly connected to the outside of the water inlet cylinder 4, and the top of the fixing frame three 28 is fixedly connected with a connecting rod 25, one end of the connecting rod 25 is fixedly connected with a movable plate 24, and the outer side of the movable plate 24 is slidingly connected with a connecting shell 23. Both sides of the outside of the filter 12 are fixedly connected with connecting blocks 22, and a card slot 29 is provided at the bottom of the connecting block 22. The shape of the connecting shell 23 matches the shape of the card slot 29, and the outer sides of the two connecting shells 23 are respectively engaged with the corresponding card slots 29, and the outer sides of the two connecting shells 23 are fixedly connected with push plates 27.

[0037] Specifically, the third fixing frame 28 provides support for the second spring 26 and the connecting rod 25. The connecting rod 25 serves as a connection, connecting the third fixing frame 28 and the movable plate 24. It also provides support for the second spring 26, ensuring that the second spring 26 maintains a stable orientation during tension and compression. The movable plate 24 serves as a sliding track for the connecting shell 23, ensuring that the connecting shell 23 can slide smoothly on its outer side, allowing the connecting shell 23 to be accurately inserted into or removed from the slot 29. The shape of the connecting shell 23 matches the slot 29, allowing it to fit tightly into the slot 29, thereby securing the filter 12 within the mounting shell 11. The connecting block 22 provides a snap-in position for the connecting shell 23. The shape and size of the slot 29 match the connecting shell 23, ensuring that the connecting shell 23 can be accurately inserted therein, thereby firmly securing the filter 12. By pushing the push plate 27, the connecting shell 23 can be disengaged from or engaged with the slot 29, completing the removal and installation of the filter 12. The design of the push plate 27 facilitates operation by the operator and improves work efficiency.

[0038] Reference Figure 4 and Figure 6 The outer sides of the two connecting rods 25 are both sleeved with springs 26, one end of the two springs 26 is fixedly connected to the bottom of the corresponding connecting shell 23, and the other end of the two springs 26 is fixedly connected to the top of the corresponding fixing frame 3 28.

[0039] Specifically, spring 26 provides an automatic reset function. When push plate 27 is pushed to disengage connecting housing 23 from slot 29, spring 26 is compressed. After releasing push plate 27, the elastic restoring force of spring 26 automatically pushes connecting housing 23 back into slot 29, enabling quick installation of filter 12. Fixing bracket 3 28 provides a fixing point for one end of spring 26.

[0040] Reference Figure 1 , Figure 2 and Figure 3A high-pressure pump 6 is installed on the outside of the fixed frame 3. The input end of the high-pressure pump 6 is fixedly connected to the input pipe 5, and the output end of the high-pressure pump 6 is fixedly connected to the output pipe 7. The end of the input pipe 5 away from the water inlet pipe 8 is connected to the bottom of the water inlet cylinder 4, and the end of the output pipe 7 away from the high-pressure pump 6 is fixedly connected to the water inlet pipe 8. The water inlet pipe 8 is connected to the pressure vessel pipe 2 through a pipeline, and the ends of the multiple pressure vessel pipes 2 away from the water inlet pipe 8 are fixedly connected to the water outlet pipe 10.

[0041] Specifically, high-pressure pump 6 pressurizes water, enabling it to overcome osmotic pressure and pass smoothly through the reverse osmosis membrane for desalination. An inlet pipe 5 delivers water from the water inlet cylinder 4 to high-pressure pump 6, providing it with a water source. An outlet pipe 7 delivers pressurized water from high-pressure pump 6 to inlet pipe 8, where it enters pressure vessel tube 2 for reverse osmosis treatment. Inlet pipe 8 evenly distributes the high-pressure water output from high-pressure pump 6 to each pressure vessel tube 2. An outlet pipe 10 discharges the purified water, after reverse osmosis treatment, from the pressure vessel tube 2 for user use or subsequent processing.

[0042] Reference Figure 1 , Figure 2 and Figure 3 The outer side of the frame 1 is fixedly connected to a fixing frame 2 9 , the top of the fixing frame 2 9 is fixedly connected to the bottom of the water inlet pipe 8 , and the outer side of the connecting plate 18 is slidably connected to the inner wall of the fixed shell 16 .

[0043] Specifically, fixing bracket 2 9 provides stable support for water inlet pipe 8, ensuring that it does not wobble or deform due to the impact of the water flow or its own weight during the process of delivering high-pressure water. Connecting plate 18, driven by spring 17, slides along the inner wall of fixing housing 16, ensuring that brush 19 always closely adheres to the outer surface of filter screen 12, effectively cleaning impurities.

[0044] Reference Figure 6 A sealing ring 20 is fixedly connected to the outside of the filter screen 12 , and a sealing groove 21 is opened on the inside of the mounting shell 11 , and the sealing ring 20 cooperates with the sealing groove 21 .

[0045] Specifically, the tight fit between the sealing ring 20 and the sealing groove 21 can effectively prevent water from leaking from the gap between the filter screen 12 and the mounting shell 11 .

[0046] Working Principle: After entering the water inlet cylinder 4, water first undergoes preliminary filtration through the filter screen 12. This intercepts larger impurities in the water, preventing them from entering the subsequent reverse osmosis membrane system and damaging the membranes. As water flows through the water inlet cylinder 4, it impacts the impeller 15, causing it to rotate. The rotation of the impeller 15 drives the fixed housing 16 at the bottom, which in turn drives the brush 19. As the brush 19 rotates, it continuously cleans the outer surface of the filter screen 12, preventing impurities from accumulating and clogging the filter screen 12. The elastic action of spring 17 ensures that the connecting plate 18 drives the brush 19 to maintain a tight fit with the filter screen 12, ensuring effective cleaning and effectively preventing clogging. This ensures smooth water flow, avoiding reductions or even interruptions in water flow caused by clogging of the filter screen 12, thereby maintaining the continuity of the desalination process. Simultaneously, after water enters the water inlet cylinder 4, the high-pressure pump 6 is activated, pumping the preliminarily filtered water from the bottom of the water inlet cylinder 4 through the inlet pipe 5. The high-pressure pump 6 pressurizes the water and delivers it to the water inlet pipe 8 through the outlet pipe 7. Supported by a fixed frame 9, the water inlet pipe 8 stably delivers high-pressure water to the pressure vessel pipes 2. Once the high-pressure water enters the multiple pressure vessel pipes 2 within the frame 1, the multiple reverse osmosis membranes within the pipes desalinate the water. The sequential operation of these multiple reverse osmosis membranes gradually increases the desalination efficiency, ensuring that the resulting water meets high purity requirements. The desalinated water is discharged through the water outlet pipe 10, while the concentrated water, which contains a higher concentration of salt and impurities, is processed separately.

[0047] When the filter 12 is to be repaired or replaced, the push plate 27 is pushed, and the push plate 27 drives the connecting shell 23 to slide outside the movable plate 24, so that the connecting shell 23 is disengaged from the slot 29 at the bottom of the connecting block 22, and the compression spring 26 is compressed. Then, the handle on the filter 12 is pulled to make the filter 12 disengage from the mounting shell 11, so that the filter 12 can be quickly repaired or replaced. Compared with the fixing method using bolts, it is faster and more convenient to use. At the same time, the structure is reasonable and convenient for people to use, which can reduce production losses caused by equipment downtime. When the filter 12 is to be installed, the push plate 27 is first pushed to make the spring 26 enter a compressed state. When the connecting shell 23 is moved to the appropriate position, the filter 12 is then inserted into the inner wall of the mounting shell 11. The sealing ring 20 is tightly inserted into the sealing groove 21 to ensure a good sealing effect. Then, the push plate 27 is released. Under the elastic force of the spring 26, the connecting shell 23 is pushed into the slot 29 in the connecting block 22 to complete the installation of the filter 12.

[0048] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-stage reverse osmosis membrane desalination device, comprising a frame (1), characterized in that: A plurality of pressure vessel tubes (2) are installed inside the frame (1), and a plurality of reverse osmosis membranes are arranged inside the pressure vessel tubes (2). A fixing frame (3) is fixedly connected to one side of the top of the frame (1), and a water inlet cylinder (4) is fixedly connected to the top of the fixing frame (3). The inner wall of the water inlet cylinder (4) is fixedly connected to a mounting shell (11), and a filter screen (12) is detachably connected to the inner wall of the mounting shell (11). The inner wall of the water inlet cylinder (4) is fixedly connected to a fixing plate (13), and the bottom of the fixing plate (13) is rotatably connected to a fixing rod (14), and the bottom of the fixing rod (14) is fixedly connected to an impeller. (15), the bottom of the impeller (15) is fixedly connected to a fixed shell (16), the inner wall of the fixed shell (16) is fixedly connected to a plurality of springs (17), the bottom of the spring (17) is fixedly connected to a connecting plate (18), the bottom of the connecting plate (18) is fixedly connected to a plurality of brushes (19), a high-pressure pump (6) is installed on the outside of the fixed frame (3), the input end of the high-pressure pump (6) is fixedly connected to an input pipe (5), the output end of the high-pressure pump (6) is fixedly connected to an output pipe (7), and a disassembly component is provided on the outside of the water inlet cylinder (4), and the disassembly component is used for disassembling the filter (12).

2. A multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: The disassembly assembly comprises two fixing frames (28), one side of each of the fixing frames (28) is fixedly connected to the outside of the water inlet cylinder (4), the top of each fixing frame (28) is fixedly connected to a connecting rod (25), one end of each connecting rod (25) is fixedly connected to a movable plate (24), the outer side of each movable plate (24) is slidably connected to a connecting shell (23), both sides of the outside of the filter screen (12) are fixedly connected to connecting blocks (22), and a card slot (29) is provided at the bottom of each connecting block (22).

3. A multi-stage reverse osmosis membrane desalination equipment according to claim 2, characterized in that: The shape of the connecting shell (23) matches the shape of the card slot (29), the outer sides of the two connecting shells (23) are respectively engaged with the corresponding card slots (29), and the outer sides of the two connecting shells (23) are fixedly connected with a push plate (27).

4. A multi-stage reverse osmosis membrane desalination equipment according to claim 2, characterized in that: The outer sides of the two connecting rods (25) are both sleeved with springs 2 (26), one end of the two springs 2 (26) is fixedly connected to the bottom of the corresponding connecting shell (23), and the other end of the two springs 2 (26) is fixedly connected to the top of the corresponding fixing frame 3 (28).

5. The multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: The plurality of brushes (19) are all made of flexible material, and the bottom of the brush (19) fits the outer surface of the filter (12).

6. The multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: The end of the input pipe (5) away from the water inlet pipe (8) is connected to the bottom of the water inlet cylinder (4), and the end of the output pipe (7) away from the high-pressure pump (6) is fixedly connected to the water inlet pipe (8), and the water inlet pipe (8) is connected to the pressure vessel pipe (2) through a pipeline.

7. The multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: The outer side of the frame (1) is fixedly connected to a second fixing frame (9), the top of the second fixing frame (9) is fixedly connected to the bottom of the water inlet pipe (8), and the outer side of the connecting plate (18) is slidably connected to the inner wall of the fixed shell (16).

8. The multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: One end of the plurality of pressure container tubes (2) away from the water inlet pipe (8) is fixedly connected to a water outlet pipe (10).

9. The multi-stage reverse osmosis membrane desalination equipment according to claim 1, characterized in that: A sealing ring (20) is fixedly connected to the outer side of the filter screen (12), a sealing groove (21) is provided on the inner side of the mounting shell (11), and the sealing ring (20) cooperates with the sealing groove (21).

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