Flue control valve for a flue gas combustion device

Abstract

The application discloses a flue control valve for a flue gas combustion device. The flue control valve comprises a valve seat and a valve core plate, the valve seat is installed in a flue gas passage and forms an annular inner sealing surface, and the outer periphery of the valve core plate forms an annular outer sealing surface; in a closed state, a fluid sealing ring groove is formed in the annular inner sealing surface and the annular outer sealing surface, and the fluid sealing ring groove is communicated with a pressurized fluid supply source through a predetermined fluid control valve. The annular inner sealing surface and the annular outer sealing surface cooperate to form a primary seal, and then the fluid sealing ring groove is filled with fluid through the pressurized fluid supply source and the fluid control valve, so that secondary fluid sealing of the annular inner sealing surface and the annular outer sealing surface is realized, the sealing effect of the flue control valve can be ensured, and leakage of flue gas to be treated can be prevented. Meanwhile, the high temperature of the flue control valve can improve the secondary fluid sealing effect, and the flue control valve is not affected by a harsh environment, the applicability of the flue control valve can be ensured, and the needs of the flue gas combustion device can be met.

Description

Technical Field

[0001] This invention relates to industrial flue gas treatment technology, and in particular to a flue gas control valve for a flue gas combustion device. Background Technology

[0002] The flue gas emitted from combustion furnaces (sintering furnaces, vertical shaft furnaces, rotary kilns, and blast furnaces) includes dust and NO. X Flue gas contains harmful pollutants such as SOx, CO, VOCs, and dioxins. To reduce these harmful pollutants, flue gas typically requires purification treatment.

[0003] Flue gas purification processes generally include dust removal, desulfurization, and denitrification, followed by venting. This process removes nitrogen and sulfur before venting, achieving flue gas purification. Volatile organic compounds (VOCs) and dioxins often enter the absorbent slurry during desulfurization and denitrification, becoming components of the slurry. During filtration of the absorbent slurry, harmful substances formed from VOCs and dioxins remain in the filter cake, making the filter cake difficult to process and thus a significant obstacle to its utilization. Current technologies either require special treatment of the absorbent slurry or specialized treatment of the filter cake, both of which increase process complexity and cost.

[0004] To improve flue gas purification efficiency, reduce the adverse effects of harmful pollutants, lower flue gas purification treatment costs, and reduce flue gas purification energy consumption, the flue gas purification systems disclosed in Chinese patent documents CN113295013A and CN113251813A are equipped with flue gas combustion devices. When the flue gas to be purified passes through the flue gas combustion device, it is burned (either spontaneously or by adding combustion-supporting substances) and converted into harmless components, thereby achieving the purpose of removing pollutants from the flue gas to be treated.

[0005] To ensure complete combustion of the flue gas in the combustion device, it is necessary to control both the entry of the flue gas and the exit of the post-combustion flue gas. This prevents a short circuit between the flue gas entry channel and the post-combustion flue gas exit channel (if the pollutant content in the flue gas is 45000 Nm³ / hr, and 0.1% of the pollutants enter the post-combustion flue gas exit channel, it will lead to severely excessive levels of pollutants in the vented or next-process flue gas, resulting in corresponding legal liability). Therefore, the flue gas control valve needs to have a high sealing effect when closed.

[0006] Meanwhile, because the flue gas control valve is located in a harsh working environment with high temperature, high corrosion, and high dust, and needs to switch between closed and open states at a high frequency, the flue gas control valve is required to have a high degree of adaptability. Ordinary control valve structures simply cannot meet the needs of flue gas control.

[0007] Ensuring both a good seal and the adaptability of the flue gas control valve is a technical challenge that needs to be addressed by those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a flue control valve for a flue gas combustion device, which can meet the needs of the flue gas combustion device while ensuring a sealing effect on the flue gas passage.

[0009] The present invention provides a flue gas control valve for a flue gas combustion device, comprising a valve seat and a valve core plate. The valve seat is installed in the flue gas passage and forms an annular inner sealing surface, and the outer periphery of the valve core plate forms an annular outer sealing surface. In the closed state, the annular inner sealing surface and the annular outer sealing surface cooperate.

[0010] At least one of the annular inner sealing surface and the annular outer sealing surface forms a fluid sealing groove, which is connected to a pressurized fluid supply source via a predetermined fluid control valve. Thus, in the closed state, the valve core plate and valve seat engage, and the annular inner sealing surface and the annular outer sealing surface cooperate to form a preliminary seal, maintaining pressure in the fluid sealing groove. At this time, fluid is introduced into the fluid sealing groove through the pressurized fluid supply source and the fluid control valve, achieving a secondary fluid seal on the annular inner sealing surface and the annular outer sealing surface. This ensures the sealing effect of the flue gas control valve and prevents leakage of the flue gas to be treated. Simultaneously, the high temperature of the flue gas control valve allows for fluid expansion, further improving the secondary fluid sealing effect. This seal is unaffected by the harsh environment of the flue gas control valve, ensuring its applicability to the needs of flue gas combustion devices.

[0011] Of course, with the valve core plate and valve seat separated, fluid injection can be interrupted when the flue control valve is open. To adapt to the opening / closing cycle and frequency of the flue control valve, the fluid injection cycle and frequency can be appropriately controlled according to the pressure of the pressurized fluid supply source, pipeline, and fluid control valve parameters.

[0012] In an optional technical solution, the fluid sealing ring groove has multiple fluid inlets, each of which is connected to the pressurized fluid supply source. This ensures that fluid fills the fluid sealing ring groove more quickly, guaranteeing a sealing effect.

[0013] In the optional technical solution, the pressurized fluid supply source includes at least one of a pressurized air supply source and a pressurized liquid supply source. Using air as the fluid sealing medium is more convenient, while using pressurized liquids (such as water) can improve the sealing effect. Of course, other substances and components can also be added to achieve the fluid sealing effect.

[0014] In an optional technical solution, the pressurized fluid supply source includes a pressurized air supply source and a pressurized liquid supply source, and also includes a gas-liquid mixer to provide a gas-liquid mixture. Using the gas-liquid mixture as the fluid sealing medium can achieve the combined effects of air and liquid.

[0015] In the optional technical solution, the annular inner sealing surface forms a first fluid sealing annular groove, and the annular outer sealing surface forms a second fluid sealing annular groove;

[0016] In the closed state, the openings of the first fluid sealing ring groove and the second fluid sealing ring groove are opposite each other. This increases the swirling space of the fluid sealing ring groove, fully utilizes the fluid's self-closing performance, and ensures a good fluid sealing effect.

[0017] In an optional technical solution, in the direction of movement of the valve core plate relative to the valve seat, the opening size of the first fluid sealing ring groove is larger than the opening size of the second fluid sealing ring groove. This way, when there is a suitable amount of wear on the mating surfaces of the annular inner sealing surface and the annular outer sealing surface, the openings of the first and second fluid sealing ring grooves can remain opposite to each other, thereby ensuring a fluid sealing effect.

[0018] In the optional technical solution, at least one of the annular inner sealing surface and the annular outer sealing surface forms a driving fluid sealing ring groove, and the driving fluid sealing ring groove communicates with the fluid sealing ring groove through an intermediate flow channel;

[0019] Compared to the fluid sealing ring groove, the driving fluid sealing ring groove is closer to the high-temperature side of the valve seat. This allows fluid to flow into the driving fluid sealing ring groove after filling the fluid sealing ring groove, creating a driving effect towards the high-temperature side and further preventing flue gas leakage on the high-temperature side.

[0020] In an optional technical solution, the flue control valve for the flue gas combustion device further includes a drive cylinder, which is connected to the valve core plate on the low-temperature side of the valve seat via a drive rod.

[0021] In an optional technical solution, the inner end of the drive rod is connected to the drive cylinder, and the outer end is slidably fitted with the support seat; the support seat is relatively fixed to the valve seat; this makes the drive rod more stable, thereby ensuring the reliability of the flue control valve. In addition, the flue control valve also includes a sealing cover with one open end and one closed end. The open end of the sealing cover is fitted and sealed with the support seat, and the outer end of the drive rod extends into the sealing cover. This prevents flue gas from entering the support seat, thereby avoiding the adverse effects of flue gas on the sliding fit of the outer end of the drive rod.

[0022] In the preferred embodiment, both the annular inner sealing surface and the annular outer sealing surface are conical surfaces; at least one of the annular inner sealing surface and the annular outer sealing surface is provided with an annular sealing groove; the flue control valve also includes a metal elastic sealing ring disposed in the annular sealing groove; the metal elastic sealing ring is an annular structure with an opening; in its natural state, the metal elastic sealing ring at least partially protrudes outside the annular sealing groove. Since both the annular inner sealing surface and the annular outer sealing surface are conical surfaces, pressure can be gradually applied to the outer circumference of the metal elastic sealing ring when they mate, causing the metal elastic sealing ring to transition from its natural state to a contracted state, thus creating pressure contact between the outer circumference of the metal elastic sealing ring and the annular inner sealing surface, thereby achieving a seal between the annular inner sealing surface and the annular outer sealing surface. Simultaneously, the metal elastic sealing ring can withstand higher temperatures, adapting to the harsh environment required by the flue control valve and ensuring the flue gas sealing effect. Attached Figure Description

[0023] Figure 1 This invention provides a schematic diagram of the internal structure of a flue control valve embodiment for a flue gas combustion device.

[0024] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0025] Figure 3 yes Figure 2 A schematic diagram of the principle of the sealing ring groove 111 or 211 for medium fluid;

[0026] Figure 4 This is a schematic diagram showing the corresponding principle of the first fluid sealing ring groove 111 and the first fluid sealing ring groove 211 in an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the fluid sealing ring groove sealing principle in another embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the structure of valve core plate 200 and metal elastic sealing ring 520;

[0029] Figure 7 This is a schematic diagram of the overall structure of the 520 metal elastic sealing ring. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] It should be noted that in this document, "upper", "lower", "left" and "right" are determined based on the corresponding diagrams, while "inner" and "outer" are determined with reference to the valve core centerline C of the flue control valve.

[0032] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the internal structure of a flue control valve for a flue gas combustion device according to an embodiment of the present invention. Figure 1 The diagram illustrates two flue control valves arranged side-by-side for combined use, which can be installed below or to the side of the flue gas combustion device. The flue gas to be burned enters the flue gas passage 10 from the inlet on the right side. The valve seat 100 and valve core plate 200 of the right side flue control valve cooperate to open or close the flow port above the flue gas combustion device.

[0033] By cooperating with the valve seat 100 and valve core plate 200 of the left flue control valve, the flow port of the flue gas combustion device above can be opened or closed, so that the flue gas after combustion can be discharged through the left outlet and enter the subsequent flue gas purification process.

[0034] In this embodiment of the invention, the flue control valve for the flue gas combustion device includes a valve seat 100 and a valve core plate 200. The valve seat 100 is installed in the flue gas passage 10 and forms an annular inner sealing surface 110. The outer periphery of the valve core plate 200 forms an annular outer sealing surface 210. In the closed state, the annular inner sealing surface 110 and the annular outer sealing surface 210 cooperate.

[0035] In this embodiment, both the annular inner sealing surface 110 and the annular outer sealing surface 210 are conical surfaces, and their inner diameters gradually decrease from the lower temperature side to the upper high temperature side. It can be understood that the annular inner sealing surface 110 and the annular outer sealing surface 210 can also be planar, forming a planar-to-planar fit.

[0036] Please refer to Figure 2 and Figure 3 , Figure 2 for Figure 1 Enlarged view of part A in the middle. Figure 3 yes Figure 2 A schematic diagram of the principle of the fluid sealing annular groove 111 or 211. In this embodiment, the annular inner sealing surface 110 forms the first fluid sealing annular groove 111, and the annular outer sealing surface 210 forms the second fluid sealing annular groove 211; the openings of the first fluid sealing annular groove 111 and the second fluid sealing annular groove 211 are opposite to each other, forming an annular groove with a relatively large space.

[0037] In this configuration, one of the first fluid sealing ring groove 111 and the second fluid sealing ring groove 211 is connected to a pressurized fluid supply source 320 via a predetermined fluid control valve 310. A pipe or channel can be provided in the valve seat 100 to connect the first fluid sealing ring groove 111 to the pressurized fluid supply source 320; alternatively, a suitable pipe or channel can be provided in the valve core plate 200 to connect the second fluid sealing ring groove 211 to the pressurized fluid supply source 320. Considering that the valve core plate 200 requires a relatively high frequency of opening and closing operations, it is preferable to provide a pipe or channel in the valve seat 100.

[0038] The pressurized fluid supply source 320 is used to provide filling fluid. In this embodiment, the pressurized fluid supply source 320 can be a gas storage device. The gas storage device can maintain the internal gas at a predetermined pressure to provide gas (such as air) with appropriate pressure to the first fluid sealing ring groove 111.

[0039] In this way, when the flue gas control valve is closed, the valve core plate 200 and the valve seat 100 are engaged, and the annular inner sealing surface 110 and the annular outer sealing surface 210 cooperate to form a preliminary seal, so that the first fluid sealing ring groove 111 and the second fluid sealing ring groove 211 maintain pressure. At this time, fluid (in this embodiment, the fluid is air) is injected into the fluid sealing ring groove 111 or 211 through the pressurized fluid supply source 320 and the fluid control valve 310, thereby achieving a secondary fluid seal on the annular inner sealing surface 110 and the annular outer sealing surface 210. This ensures the sealing effect of the flue gas control valve and prevents leakage of the flue gas to be treated. At the same time, the high temperature of the flue gas control valve allows the fluid to expand, thereby improving the secondary fluid sealing effect. Moreover, it is not affected by the harsh environment of the flue gas control valve, which ensures the applicability of the flue gas control valve and meets the needs of the flue gas combustion device.

[0040] Of course, with the valve core plate 200 and valve seat 100 separated, fluid injection can be interrupted when the flue control valve is open. To adapt to the opening / closing cycle and frequency of the flue control valve, the fluid injection cycle and frequency can be appropriately controlled according to the pressure of the pressurized fluid supply source 320, pipeline, and fluid control valve parameters.

[0041] It is understood that the aforementioned technical effects can also be achieved by forming a suitable fluid sealing ring groove in at least one of the annular inner sealing surface 110 and the annular outer sealing surface 210. The cross-section of the fluid sealing ring groove is not limited to an arc shape; it can also be triangular or other shapes. To obtain a larger swirling airflow, which is beneficial for maintaining suitable pressure in the closed state and ensuring a sealing effect, the fluid sealing ring groove can also be configured with a smaller opening and a larger internal structure. The fluid sealing ring groove can be a 360-degree closed annular groove, a 330-degree or 270-degree arc-shaped groove, or multiple discontinuous arc-shaped grooves.

[0042] In this embodiment, fluid can be introduced into the fluid sealing ring groove 111 or 211 more quickly to ensure a good sealing effect. The first fluid sealing ring groove 111 and the first fluid sealing ring groove 211 can have multiple fluid inlets, each of which is connected to the pressurized fluid supply source 320. Of course, the multiple fluid inlets can be evenly distributed circumferentially, or they can be unevenly distributed according to the pipeline distance to achieve pressure balance.

[0043] The pressurized fluid supply source 320 can be selected according to actual needs and may include at least one of a pressurized air supply source (such as an air storage device, air pump, etc.) and a pressurized liquid supply source (such as a water tank, water pump, etc. with a predetermined pressure). Using air as the fluid sealing medium is more convenient, while using pressurized liquid (such as water) can improve the sealing effect. It can also include a pressurized air supply source and a pressurized liquid supply source, with a gas-liquid mixer to provide the gas-liquid mixture. Using the gas-liquid mixture as the fluid sealing medium can achieve the combined effect of air and liquid. Of course, other substances and components can also be added to achieve the fluid sealing effect.

[0044] like Figure 4 As shown in the figure, this is a schematic diagram illustrating the corresponding principle of the first fluid sealing ring groove 111 and the first fluid sealing ring groove 211 in an embodiment of the present invention. In this embodiment, in the direction of movement of the valve core plate 200 relative to the valve seat 100, the opening size H1 of the first fluid sealing ring groove 111 is larger than the opening size H2 of the second fluid sealing ring groove 211. This combination allows the annular inner sealing surface 110 and the annular outer sealing surface 210 of the conical surface to work together. When there is a suitable amount of wear on the mating surfaces of the annular inner sealing surface 110 and the annular outer sealing surface 210, the openings of the first fluid sealing ring groove 111 and the second fluid sealing ring groove 211 can remain opposite to each other, thereby ensuring the fluid sealing effect. Of course, when the annular inner sealing surface 110 and the annular outer sealing surface 210 are planar mating surfaces, the fit tolerances of the valve core plate 200 and the valve seat 100 can be accommodated, improving the reliability of the flue control valve.

[0045] like Figure 5 As shown in the figure, this is a schematic diagram of the sealing principle of the fluid sealing ring groove in another embodiment of the present invention. In this embodiment, at least one of the annular inner sealing surface 110 and the annular outer sealing surface 210 forms a driving fluid sealing ring groove 121 or 221, which communicates with the fluid sealing ring groove 111 or 211 through an intermediate flow channel 122. The driving fluid sealing ring groove 121 or 221 is closer to the high-temperature side of the valve seat 100 than the fluid sealing ring groove 111 or 211. Thus, after the fluid fills the fluid sealing ring groove 121 or 221, it can flow towards the driving fluid sealing ring groove 121 or 221, creating a driving effect towards the high-temperature side, further preventing flue gas leakage on the high-temperature side.

[0046] Please refer to Figure 6 and Figure 7 , Figure 6 This is a structural schematic diagram of the valve core plate 200 and the metal elastic sealing ring 520. Figure 7 This is a schematic diagram of the overall structure of the 520 metal elastic sealing ring. You can also refer to... Figure 2In this embodiment, both the annular inner sealing surface 110 and the annular outer sealing surface 210 are conical surfaces; at least one of the annular inner sealing surface 110 and the annular outer sealing surface 210 is provided with an annular sealing groove 510; the flue control valve also includes a metal elastic sealing ring 520 disposed in the annular sealing groove 510; the metal elastic sealing ring 520 is an annular structure with an opening S. In its natural state, the metal elastic sealing ring 520 at least partially protrudes outside the annular sealing groove 510. The natural state refers to the state of the metal elastic sealing ring 520 when it is not subjected to external force (such as when the valve core plate 200 is separated from the valve seat 100). Correspondingly, when the valve core plate 200 is engaged with the valve seat 100 and the annular inner sealing surface 110 and the annular outer sealing surface 210 are in contact, the metal elastic sealing ring 520 is subjected to pressure from the annular inner sealing surface 110 and deforms elastically, which is a non-natural state. In an unnatural state, the annular sealing groove 510 can retract into the sealing groove 510, and its outer circumference forms pressure contact with the annular inner sealing surface 110, maintaining the seal of the contact surface.

[0047] Both the annular inner sealing surface 110 and the annular outer sealing surface 210 are conical surfaces. When the annular inner sealing surface 110 and the annular outer sealing surface 210 are engaged, pressure is gradually applied to the outer circumference of the metal elastic sealing ring 520, causing the metal elastic sealing ring 520 to transition from its natural state to a contracted state. This creates pressure contact between the outer circumference of the metal elastic sealing ring 520 and the annular inner sealing surface 110, thereby achieving a seal between the annular inner sealing surface 110 and the annular outer sealing surface 210. Simultaneously, the metal elastic sealing ring 520 can withstand higher temperatures, adapting to the harsh environment required by the flue gas control valve and ensuring effective flue gas sealing. The metal elastic sealing ring 520 can be made of materials with good elasticity, such as 65Mn, 50CrVA, or 55Si2Mn elastic steel.

[0048] See again Figure 1In this embodiment of the invention, the flue gas control valve for the flue gas combustion device further includes a drive cylinder 410, which is connected to the valve core plate 200 on the low-temperature side of the valve seat 100 via a drive rod 420. The inner end of the drive rod 420 is connected to the drive cylinder 410, and the outer end is slidably engaged with a support seat 430. The support seat 430 is fixed relative to the valve seat 100, and a corresponding frame can be provided above it to fix the support seat 430. This makes the drive rod 420 more stable, thereby ensuring the reliability of the flue gas control valve. In addition, the flue gas control valve also includes a sealing cover 440 with one open end and one closed end. The open end of the sealing cover 440 is sealed with the support seat 430, and the outer end of the drive rod 420 extends into the sealing cover 440. This prevents flue gas from entering the support seat 430, thereby avoiding the adverse effects of flue gas on the sliding engagement of the outer end of the drive rod 420.

[0049] The specific embodiments provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A flue control valve for a flue gas combustion device, comprising a valve seat (100) and a valve core plate (200), the valve seat (100) is installed in a flue gas passage (10) and forms a ring-shaped inner sealing surface (110), the outer periphery of the valve core plate (200) forms a ring-shaped outer sealing surface (210); in a closed state, the ring-shaped inner sealing surface (110) and the ring-shaped outer sealing surface (210) are matched; At least one of the annular inner seal face (110) and the annular outer seal face (210) forms a fluid seal ring groove (111 or 211) that is in communication with a pressurized fluid supply source (320) through a predetermined fluid control valve (310); and At least one of the ring-shaped inner sealing surface (110) and the ring-shaped outer sealing surface (210) forms a driving fluid sealing ring groove (121 or 221), the driving fluid sealing ring groove (121 or 221) is communicated with the fluid sealing ring groove (111 or 211) through an intermediate flow channel (122); the driving fluid sealing ring groove (121 or 221) is closer to the high-temperature side of the valve seat (100) relative to the fluid sealing ring groove (111 or 211) to form a driving towards the high-temperature side after the fluid fills the fluid sealing ring groove (111 or 211) and flows to the driving fluid sealing ring groove (121 or 221).

2. The flue control valve for a flue gas combustion device according to claim 1, characterized by, The fluid sealing ring groove (111 or 211) has a plurality of fluid inlet ports, each of which is communicated with the pressurized fluid supply source (320).

3. The flue control valve for a flue gas combustion device according to claim 1, characterized by, The pressurized fluid supply source (320) comprises at least one of a pressurized air supply source and a pressurized liquid supply source.

4. The flue control valve for a flue gas combustion device according to claim 3, characterized by The pressurized fluid supply source (320) comprises a pressurized air supply source and a pressurized liquid supply source, and further comprises a gas-liquid mixer to provide a gas-liquid mixture.

5. The flue control valve for a flue gas combustion device according to claim 1, characterized by The ring-shaped inner sealing surface (110) forms a first fluid sealing ring groove (111), and the ring-shaped outer sealing surface (210) forms a second fluid sealing ring groove (211). In the closed state, the opening of the first fluid sealing ring groove (111) and the opening of the second fluid sealing ring groove (211) are opposite.

6. The flue control valve for a flue gas combustion device according to claim 5, characterized by In the movement direction of the valve core plate (200) relative to the valve seat (100), the opening size (H1) of the first fluid sealing ring groove (111) is greater than the opening size (H2) of the second fluid sealing ring groove (211).

7. The flue control valve for a flue gas combustion device according to any one of claims 1-6, further comprising a driving cylinder (410), the driving cylinder (410) is connected with the valve core plate (200) through a driving rod (420) on the low-temperature side of the valve seat (100).

8. The flue control valve for a flue gas combustion device according to claim 7, characterized by The inner end of the driving rod (420) is connected with the driving cylinder (410), and the outer end is slidingly matched with a supporting seat (430); the supporting seat (430) is fixed relative to the valve seat (100); Further comprising a sealing cover (440) with one open end and one closed end, the open end of the sealing cover (440) is matched and sealed with the supporting seat (430), and the outer end of the driving rod (420) extends into the sealing cover (440).

9. A flue control valve for a flue gas combustion device according to any one of claims 1-6, characterized in that The ring-shaped inner sealing surface (110) and the ring-shaped outer sealing surface (210) are both conical surfaces; at least one of the ring-shaped inner sealing surface (110) and the ring-shaped outer sealing surface (210) is provided with an annular sealing ring groove (510). Further comprising a metal elastic sealing ring (520) arranged in the annular sealing ring groove (510); the metal elastic sealing ring (520) is an annular structure with an opening (S), and in a natural state, the metal elastic sealing ring (520) at least partially protrudes out of the annular sealing ring groove (510).

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