Valve and high-temperature-resistant soft sealing ring adopted by same

Abstract

The invention relates to a valve and a high-temperature-resistant soft sealing ring adopted by the valve, the high-temperature-resistant soft sealing ring comprises an annular air bag and an air nozzle, and the air nozzle is connected with the annular air bag and an external air source; the cable further comprises an annular pipe sleeve and a high-temperature-resistant short fiber filling layer. The annular air bag and the annular pipe sleeve are hollow cloth pipes formed by weaving high-temperature-resistant fiber materials. The annular air bag is sleeved with the annular pipe sleeve, and the outer diameter of the annular air bag in the inflated state is smaller than the inner diameter of the annular pipe sleeve. An annular space between the outer surface of the annular air bag and the inner surface of the annular pipe sleeve is filled with the high-temperature-resistant short fiber filling layer. The soft sealing ring can be applied to valves in various high-temperature occasions, and the valves are simplified in structure, good in sealing performance and low in energy consumption.

Description

Technical Field

[0001] The invention relates to a valve used in high-temperature or ultra-high-temperature media applications and a high-temperature resistant soft sealing ring used by the valve. Background Art

[0002] Traditional butterfly valves typically utilize a metal-to-metal seal. This seal is susceptible to thermal expansion in high-temperature environments, causing compression between the valve disc and seat, making the valve difficult to open or close, or even preventing it from opening. The contact surfaces of the seal require high-precision machining, increasing manufacturing costs. Even so, achieving zero leakage is difficult for large-caliber butterfly valves. These valves typically require high actuator torque, further increasing manufacturing and operating costs.

[0003] Glasses valves can be used in applications with high-temperature media and provide excellent sealing. However, they often suffer from the following issues: 1. Flow rate cannot be adjusted; 2. Single-plate glasses valves can leak and pollute the environment during opening and closing; 3. Double-plate glasses valves are expensive, complex, bulky, and even impossible to install in some applications.

[0004] To address these issues, some existing technologies use soft sealing methods. For example, Chinese patent CN110360325 discloses a "seatless butterfly valve and its soft sealing method." Its structural principle involves wrapping a rubber tube around the radial direction of the valve plate. The rubber tube expands when inflated and forms close contact with the valve plate and valve seat, achieving a good seal. However, rubber hoses are unsuitable for high-temperature media. Another example is Chinese patent CN216923244, which discloses a "bell-less sealing valve for a high-temperature furnace top." The flexible sealing filler uses high-temperature-resistant ceramic fiber wool, addressing the seal's high-temperature resistance. However, its shortcomings are that the ceramic fiber wool itself lacks density, resulting in significant air leakage. Furthermore, large-sized flue butterfly valves deform significantly after installation, and the ceramic fiber wool's inherent elasticity is insufficient, resulting in a loose seal and poor sealing effectiveness. Similar patents, such as Chinese patents CN215720887U, CN217603372U, and CN215720887U, also suffer from the aforementioned issues.

[0005] For existing gate valves, when they are large, hard seals are difficult to achieve zero leakage. To achieve a good seal, soft seal structures are often used, such as a dual seal structure using graphite packing and rubber sheets. However, the use of rubber has the problem of temperature limitations. Graphite packing, due to carbon burnout at high temperatures, can only be used below 500°C, thus limiting the valve's use. Even in applications below 500°C, using graphite packing still makes it difficult to achieve a good seal due to the large deformation of large gate valves and the limited elastic range of graphite packing.

[0006] Chinese patent CN112923085 discloses a valve that can function as both a gate valve and a glasses valve. Compared to existing glasses valves, it features a simpler structure, significantly fewer actuators, and can function as both a valve and a blind plate. In practice, when users use products manufactured according to this patent in applications at temperatures of 680°C and 780°C, respectively, and employ mica packing, these require larger and more powerful actuators and transmission mechanisms. Furthermore, because mica packing has little elasticity, the valve can easily leak when deformed by external forces, requiring appropriate compensation measures, which undoubtedly increases costs.

[0007] Currently, someone is using Metso's technology to manufacture a flue gas flap valve with an outlet diameter of ∅3800 and a design temperature of 1350°C. According to Metso's drawings, the valve plate is cast from a high-temperature-resistant inorganic material, and the valve seat is also made of an inorganic material containing aluminum oxide filaments. A gap of more than ten millimeters is left between the valve plate and the seat. During maintenance, leakage and high downstream temperatures hinder maintenance personnel's internal inspection work. Even with a small gap between the valve plate and the seat, leakage is still unavoidable. Furthermore, under such operating conditions, the valve is required to act as a blind plate. Clearly, the market urgently needs a valve that can withstand such high temperatures without leakage or can function as a blind plate. Summary of the Invention

[0008] In view of the above problems existing in the prior art, the present invention aims to provide a soft sealing ring that can maintain good sealing performance in high temperature or ultra-high temperature environments, and apply it to valves in high temperature environments to achieve effective sealing.

[0009] The technical solution of the present invention is achieved as follows: A high temperature resistant soft sealing ring, comprising an annular airbag and an air nozzle, wherein the air nozzle is connected to the annular airbag and an external air source; It also includes an annular pipe sleeve and a high-temperature resistant short fiber filling layer; The annular airbag and the annular tube sleeve are both hollow cloth tubes woven from high-temperature resistant fiber materials; The annular airbag sleeve is placed in the annular tube sleeve, and its outer diameter in the inflated state is smaller than the inner diameter of the annular tube sleeve; The high-temperature resistant short fiber filling layer is filled in the annular space between the outer surface of the annular airbag and the inner surface of the annular tube sleeve.

[0010] Specifically, the short fiber filling layer may be in a cotton shape.

[0011] Specifically, the high-temperature resistant fiber material used in the annular airbag and the annular tube sleeve is made of aluminum silicate ceramic, alumina, high silica, glass or quartz; these materials have excellent high-temperature tolerance and wear resistance, and a low friction coefficient; wherein the aluminum silicate ceramic fiber can restore its original performance after it is exposed to water vapor and dried.

[0012] The aluminum silicate ceramic is aluminum silicate-based, and the aluminum oxide is high-purity aluminum oxide.

[0013] The multi-layer composite structure and composite material configuration of the soft sealing ring make it micro-permeable, which can maintain the stability of the air pressure in the soft sealing ring under continuous inflation, and the soft sealing ring and the corresponding sealing surface are always in close contact and have excellent and stable sealing performance; at the same time, the micro-permeability can avoid or reduce the phenomenon of scaling and agglomeration on the pipe of the soft sealing ring, and play a wind sealing effect at the corresponding sealing part.

[0014] Relying on the elasticity and wrapping properties of the high-temperature resistant, for example, cotton-like short fiber filling layer, the soft sealing ring can better maintain the air pressure inside the soft sealing ring and tighten its annular tube sleeve in the inflated state so that the soft sealing ring is tightly attached to the sealing part or sealing surface to ensure its sealing performance.

[0015] Furthermore, the outer surface and / or inner surface of the annular tube sleeve and the annular airbag are coated with a high temperature resistant coating to enhance their wear resistance and anti-aging performance, and reduce gas leakage in the soft sealing ring to reduce energy consumption.

[0016] The high-temperature resistant soft sealing ring can be applied to the sealing surfaces of valve plates and / or valve seats of various valves used in high-temperature environments.

[0017] The present invention also discloses a valve, which includes a valve body and a valve plate; the inner wall of the valve body constitutes a valve seat; the soft sealing structure between the valve plate and the valve seat adopts the high-temperature resistant soft sealing ring; in the inflated state, the radial surface of the soft sealing ring is in close contact with the corresponding sealing parts of the valve plate and the valve seat, thereby achieving effective sealing in relevant application scenarios, especially high-temperature applications.

[0018] Furthermore, the high-temperature resistant soft sealing rings are arranged to be coaxially sleeved along the radial direction of the valve plate in more than two pieces, and each soft sealing ring is connected to an external gas source through an air nozzle for inflation; an annular gap is left between two adjacent soft sealing rings along their radial direction, and an air nozzle or air hole is provided corresponding to the annular gap, and the air nozzle or air hole connects the annular space where the gap between the two adjacent soft sealing rings is located with the external gas source, so as to fill the annular space of the gap with gas to form an airtight seal.

[0019] The double-layer or multi-layer sealing ring structure is particularly suitable for applications where leakage of the valve is not allowed.

[0020] Compared with the existing technology, the present invention adopts a soft sealing ring structure made of high-temperature resistant fiber material, which can be applied to a variety of high-temperature sealing scenarios, especially suitable for valves with zero leakage in many occasions with extremely high temperatures; it has significant improvements: Good sealing effect and high reliability: Due to the characteristics of the soft sealing ring of the present invention having a large elastic range or large deformation after inflation, when the valve is affected by external forces and produces a large deformation, the valve can achieve an effective and excellent sealing effect and avoid leakage. The multi-layer composite structure and composite material configuration make the soft sealing ring micro-permeable, capable of maintaining its internal air pressure stability after inflation; on the other hand, the micro-leakage of gas generated by the micro-permeability can also reduce the phenomenon of scaling or agglomeration on the corresponding structure of the soft sealing ring, thereby improving the reliability of the soft sealing ring; and the soft sealing ring can simultaneously form a sealing effect of sealing wind when in a continuously inflated working state.

[0021] Low manufacturing and use costs: The soft sealing ring of the present invention achieves a sealing effect by achieving a tight fit with the sealing part of the valve (valve plate and valve seat) through continuous inflation. The corresponding inflation pressure is adjustable, that is, the contact pressure between the soft sealing ring and the sealing part of the valve can be controlled by adjusting the inflation pressure. At the same time, the friction coefficient between the fiber material used in the soft sealing ring and the valve plate or valve seat is relatively low, thereby controlling the size, power and size of the actuator and the transmission mechanism to achieve the purpose of cost control; moreover, since the soft sealing ring is not easily damaged, the service life of the valve is correspondingly extended.

[0022] The soft sealing ring can be applied to valves in various high-temperature or ultra-high-temperature environments, and the structure of the valve is greatly simplified. For example, when used in a butterfly valve, the inner wall of the valve body serves as the valve seat. By adopting the soft sealing ring, the pressure loss is greatly reduced, thereby reducing energy consumption. For example, when it is applied to a plug valve or a glasses valve, the function of a blind plate can be realized, thus solving the problem of difficult installation of a blind plate in environments with particularly high temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of the sealing ring according to Example 1 described in the present invention; Figure 2 yes Figure 1 AA cross-sectional view; Figure 3 1 is a front view of a sealing ring according to Example 2 of the present invention; based on Example 1, it is provided with an air nozzle for connecting the annular airbag and an external air source; Figure 4This is a front view of a sealing ring according to Example 3 described in the present invention; Figure 5 yes Figure 4 BB cross-sectional view; Figure 6 This is a front view of a sealing ring according to Example 4 described in the present invention; Figure 7 yes Figure 6 CC cross-sectional view Figure 8 is a schematic diagram of Example 5 described in accordance with the present invention, which is a front view of a butterfly valve using the high-temperature resistant soft sealing ring described in Example 4; Figure 9 yes Figure 8 EE cross-sectional view; Figure 10 yes Figure 8 DD cross-sectional view; Figure 11 is a schematic diagram of Example 6 described in accordance with the present invention, which is a front view of a gate valve using the high-temperature resistant soft sealing ring described in Example 4; Figure 12 yes Figure 11 FF cross-sectional view; Figure 13 is a schematic diagram of Example 7 described in accordance with the present invention, which is a front view of a glasses valve using the high-temperature resistant soft sealing ring described in Example 4; Figure 14 yes Figure 13 GG cross-sectional view. In the figure, 1. Soft sealing ring 1-1. Annular sleeve 1-2. High-temperature resistant short fiber filling layer 1-3. Air nozzle (connects the annular airbag to the external air source) 1-4. Annular airbag 1-5. Air nozzle (connects the axial gap between the two sealing rings to the external air source) 2. Valve body 3. Valve plate 4. Valve stem 5. Actuator 6. 6' limit ring 7. Valve plate 8. Valve stem 9. Actuator 10. Valve plate 11, 11'. Cover plate DETAILED DESCRIPTION Example 1

[0024] A high temperature resistant soft sealing ring 1, such as Figure 1 and 2 As shown, the device comprises annular airbags 1-4, each of which is a hollow fabric tube woven from a high-temperature-resistant fiber material. The soft sealing ring 1 is slightly permeable, maintaining stable air pressure within the ring after continuous inflation, ensuring a constant seal against the sealing surface. This slightly permeable property also reduces or prevents scaling or agglomeration on the fiber fabric used, thereby improving the sealing performance of the soft sealing ring.

[0025] Specifically, the material of the high-temperature resistant fiber material can be aluminum silicate ceramics, alumina, high silica, glass, quartz, etc.; these materials have excellent high-temperature tolerance and wear resistance, and a small friction coefficient. The ceramic fiber therein has the characteristic of being able to restore its original performance after drying after contact with water vapor; the aluminum silicate ceramics can be aluminum silicate-based, and the alumina can be high-purity alumina. Example 2

[0026] A high temperature resistant soft sealing ring 1, such as Figure 3 As shown, the structure, based on Example 1, further includes an air nozzle 1-3 for connecting an annular airbag 1-4 to an external air source, thereby inflating and deflating the annular airbag 1-4. When continuously inflated, the annular airbag 1-4 expands, its annular outer surface tightly contacting the corresponding sealing areas of the valve plate and valve seat, respectively, to achieve a seal. Simultaneously, gas leaking from the annular airbag acts as a sealing air barrier. This structure is suitable for applications requiring leak-proof valves or sealing areas. Example 3

[0027] A high temperature resistant soft sealing ring 1, such as Figure 4 and Figure 5 As shown, based on Example 1, the annular airbag 1-4 is filled with a high-temperature-resistant cotton-like short fiber filling layer 1-2. The elasticity of the short fiber filling layer 1-2 allows the soft sealing ring 1 to adhere closely to the corresponding sealing surfaces of the valve plate and valve seat, or allows the annular outer surface of the annular airbag 1-4 to contact the valve plate and valve seat, respectively. This high-temperature-resistant soft sealing ring 1 is suitable for applications where slight leakage is tolerated in the corresponding valve or sealing area. Example 4

[0028] A high temperature resistant soft sealing ring, such as Figure 6 and Figure 7 As shown, it includes an annular tube sleeve 1-1, a high-temperature resistant short fiber filling layer 1-2, an annular airbag 1-4 and an air nozzle 1-3, and the air nozzle 1-3 connects the annular airbag 1-4 and an external air source; the annular airbag 1-4 and the annular tube sleeve 1-1 are both hollow cloth tubes woven from high-temperature resistant fiber materials; the annular airbag 1-4 is placed in the annular tube sleeve 1-1, and its outer diameter in the inflated state is smaller than the inner diameter of the annular tube sleeve; the high-temperature resistant short fiber filling layer 1-2 is cotton-like and fills the annular space between the outer surface of the annular airbag 1-4 and the inner surface of the annular tube sleeve 1-1.

[0029] Example 4 is based on the above-mentioned embodiment. Through the elastic wrapping and further sealing of the high-temperature resistant short fiber filling layer 1-2 and the annular tube sleeve 1-1, the characteristics of their respective material properties and structural settings are utilized to further reduce the leakage of the soft sealing ring 1, thereby achieving the effect of reducing energy consumption.

[0030] Furthermore, the outer surface and / or inner surface of the annular airbag 1-4 and / or the annular tube sleeve 1-1 can be coated with a high-temperature resistant coating to enhance its wear resistance and aging resistance and reduce the leakage of the airbag made of cloth material, while reducing the energy consumption caused by gas leakage. Example 5

[0031] A butterfly valve, such as Figure 8-10 As shown, it includes a valve body 2 and a valve plate 3, and the inner wall of the valve body 2 constitutes a valve seat; the soft sealing structure between the valve plate 3 and the valve seat adopts the high-temperature resistant soft sealing ring 1 described in the previous embodiment; in the inflated state, the radial surfaces of the soft sealing ring 1 are in close contact with the corresponding sealing parts of the valve plate 2 and the valve seat, respectively, thereby achieving effective sealing in specific application scenarios, especially high-temperature or ultra-high-temperature applications. Example 6

[0032] A gate valve, such as Figure 11 and 12 As shown, it includes a valve body 2 and a valve plate 7. The inner wall of the valve body 2 forms the valve seat. Two high-temperature resistant soft sealing rings 1 and 1' described in the previous embodiment are installed between the two sides of the valve plate 7 and the inner wall of the valve body 2 (i.e., the valve seat). The two soft sealing rings 1 and 1' on each side are coaxially sleeved to form a double-layer soft sealing structure, and corresponding limiting rings 6 and 6' are provided to limit the position of the soft sealing rings 1 and 1'. At the same time, an annular gap is left between the two soft sealing rings 1 and 1' on the same side along the radial direction. Each soft sealing ring is connected to an external air source through an air nozzle 1-3 for inflation, and an air nozzle or air hole 105 is provided corresponding to the annular gap to connect to an external air source to fill the annular space of the gap with air to form an airtight seal. This double-layer soft sealing structure is particularly suitable for applications where leakage is not allowed. Example 7

[0033] A glasses valve, such as Figure 13 and 14As shown, the valve comprises a valve body 2 and a valve plate 10. The inner wall of the valve body 2 forms the valve seat. The soft sealing rings 1 described in the previous embodiment are positioned between the valve plate 10 and the inner wall of the valve body 2 (i.e., the valve seat). The two soft sealing rings 1 are fixed to the inner wall of the valve body 2, and to achieve a better seal, the two soft sealing rings 1 are each inflated with air. Similar to Example 6, a double-layer soft sealing structure can be configured, with two soft sealing rings (not shown) positioned on each side of the valve plate 10. The two soft sealing rings 1 on each side are coaxially spaced radially, with the outer diameter of the smaller soft sealing ring smaller than the inner diameter of the larger soft sealing ring, leaving an annular gap between them. Air nozzles are installed in corresponding locations within the annular gaps for connecting to an external air source for inflation and sealing. This double-layer soft sealing structure is suitable for applications where leakage is unacceptable. The valve plate 10 of the glasses valve has cover plates 11 and 11' on either side. With these cover plates 11 and 11' removed, the glasses valve can be used as a blind plate.

[0034] Obviously, the above embodiments can be combined in many ways, and the ones listed are only some of the embodiments of the present invention, not all of them. On this basis, any technical solution obtained by equivalent replacement or modification of the technical solution and inventive concept of the present invention by any person skilled in the art within the technical scope disclosed by the present invention without creative work should be included in the scope of protection of the present invention.

Claims

1. A high-temperature resistant soft sealing ring, comprising an annular airbag and an air nozzle, wherein the air nozzle is connected to the annular airbag and an external air source; characterized in that: It also includes an annular pipe sleeve and a high-temperature resistant short fiber filling layer; The annular airbag and the annular tube sleeve are both hollow cloth tubes woven from high-temperature resistant fiber materials; The annular airbag sleeve is placed in the annular tube sleeve, and its outer diameter in the inflated state is smaller than the inner diameter of the annular tube sleeve; The high-temperature resistant short fiber filling layer is filled in the annular space between the outer surface of the annular airbag and the inner surface of the annular tube sleeve.

2. The high temperature resistant soft sealing ring according to claim 1, characterized in that: The high-temperature resistant fiber material is made of aluminum silicate ceramics, aluminum oxide, high silica, glass or quartz.

3. The high temperature resistant soft sealing ring according to claim 1, characterized in that: The outer surface and / or inner surface of the annular tube sleeve and the annular airbag are coated with a high temperature resistant coating.

4. A valve comprising a valve body and a valve plate; the inner wall of the valve body forming a valve seat; characterized in that: The soft sealing structure between the valve plate and the valve seat adopts the high-temperature resistant soft sealing ring as described in any one of claims 1 to 3; in the inflated state, the radial surface of the soft sealing ring is in close contact with the sealing part of the valve plate and the valve seat.

5. The valve according to claim 4, wherein: The high-temperature resistant soft sealing rings are arranged to be coaxially sleeved with more than two, and an annular gap is left between two adjacent soft sealing rings along their radial direction. An air nozzle or air hole is set corresponding to the annular gap, and the air nozzle or air hole connects the annular gap with an external air source.

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