Temperature adaptive multi-seal structure

Abstract

The utility model provides a kind of temperature self-adapting multiple sealing structure, including packing gland, bonnet, there is vermiculite packing in the packing gland of bonnet, inner opening C type metal sealing ring, C type metal sealing ring pressure ring, outer opening C type metal sealing ring, inverted L type metal sealing pad.The utility model solves the contradictory relationship between sealing and thermal expansion of inverted L type metal sealing pad under high temperature condition by wave sealing structure, to prevent the phenomenon of jamming under high temperature.At the same time, through multiple sealing structure, the problem of high-temperature molten salt valve shaft end leakage caused by direct erosion of chlorinated molten salt medium to packing and high-low temperature alternation is reduced, effective sealing under various temperature conditions is realized.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a temperature-adaptive multi-seal structure. Background Technology

[0002] Ultra-high temperature molten salt valves are core equipment in solar thermal power plants. To meet higher energy efficiency requirements, their design temperature is as high as 670℃. This makes ultra-high temperature molten salt valves prone to expansion and jamming under working conditions. At the same time, the alternation of high and low temperatures can also easily cause shaft end leakage problems during field use.

[0003] The existing patent "CN 222297135 U" uses an elastic element to apply upward pressure as the pre-tightening force for the packing seal, which can increase the sealing performance of the packing but also increases the sealing torque, making the packing prone to wear during frequent opening and closing. However, this solution does not consider the temperature fluctuations during equipment start-up and shutdown, which can easily lead to molten salt leakage after prolonged use.

[0004] The existing technology patent "CN 221610598 U" has a relatively complex structure for the sealing assembly, which is difficult to mold. When the U-shaped part in the sealing assembly is compressed by axial force, it will generate radial force on the valve stem surface. After frequent valve operation, surface scratches are easily generated, affecting the normal sealing and operation of the valve. Utility Model Content

[0005] To address the problems mentioned in the background art, this utility model provides a temperature-adaptive multi-seal structure, including a packing gland and a valve cover. The stuffing box of the valve cover contains vermiculite packing, an inner-opening C-shaped metal sealing ring, a C-shaped metal sealing ring pressure ring, an outer-opening C-shaped metal sealing ring, and an inverted L-shaped metal sealing gasket. The corrugated sealing surface of the inverted L-shaped metal sealing gasket is covered with mica material. The inner-opening C-shaped metal sealing ring and the outer-opening C-shaped metal sealing ring are pressed together by the C-shaped metal sealing ring pressure ring. The positive pressure of the C-shaped metal sealing ring pressure ring and the sealing force of the vermiculite packing originate from the packing gland.

[0006] Furthermore, the inner-opening C-type metal sealing ring and the outer-opening C-type metal sealing ring include an inner metal spring and an outer metal covering layer. Beneficial effects

[0007] This structure employs a multi-layer sealing design, including: an inverted L-shaped metal gasket, a C-shaped metal sealing ring, and vermiculite packing. The inverted L-shaped metal gasket provides a primary seal; its corrugated sealing structure ensures no jamming at high temperatures while maintaining reliable sealing performance and reducing direct erosion of the packing by chlorinated molten salt media. The C-shaped metal sealing ring provides a secondary seal; its internal spring provides effective preload at various temperatures, isolating the media. The vermiculite packing provides a triple seal, offering high sealing reliability.

[0008] The wave-shaped sealing structure at the inner diameter of the inverted L-shaped metal gasket is a semi-circular multi-seal contact point. The contact point and valve stem use a transition fit. Under high-temperature operating conditions, expansion forms an effective metal seal with the valve stem, preventing the medium from passing through the gap between the valve stem and valve body and causing packing erosion. Under normal-temperature maintenance conditions, a certain clearance exists between the two, facilitating the replacement of the inverted L-shaped metal seal. The valve body support portion of the inverted L-shaped gasket uses a hollow support to facilitate medium backflow and prevent medium crystallization and jamming. The valve body and valve cover are integrally forged, avoiding inherent defects from casting and mitigating casting defects, making the entire valve safer and more reliable. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a schematic diagram of an inverted L-shaped metal gasket.

[0011] In the diagram: 1. Packing gland; 2. Vermiculite packing; 3. Inner-opening C-type metal seal ring; 4. C-type metal seal ring pressure ring; 5. Outer-opening C-type metal seal ring; 6. Inverted L-shaped metal gasket; 7. Valve cover. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] See Figure 1-2 A temperature-adaptive multi-seal structure, comprising a packing gland 1, vermiculite packing 2, an inner-opening C-type metal sealing ring 3, a C-type metal sealing ring pressure ring 4, an outer-opening C-type metal sealing ring 5, an inverted L-shaped metal sealing gasket 6, and a valve cover 7.

[0014] The vermiculite packing 2, the internally open C-type metal sealing ring 3, the C-type metal sealing ring pressure ring 4, the externally open C-type metal sealing ring 5, and the inverted L-shaped metal sealing gasket 6 are located inside the stuffing box of the valve cover 7. The packing gland 1 and the valve cover 7 are connected and fastened by threads.

[0015] The corrugated sealing surface of the inverted L-shaped metal gasket 6 is covered with mica material. The inner-opening C-shaped metal sealing ring 3 and the outer-opening C-shaped metal sealing ring 5 are pressed together by the C-shaped metal sealing ring pressure ring 4. The inner-opening C-shaped metal sealing ring 3 and the outer-opening C-shaped metal sealing ring 5 include an internal metal spring and an external metal covering layer. The positive pressure of the C-shaped metal sealing ring pressure ring 4 comes from the packing gland 1, and the sealing force of the vermiculite packing 2 also comes from the packing gland 1.

[0016] This structure employs a multi-layer sealing design, including: an inverted L-shaped metal gasket, a C-shaped metal sealing ring, and vermiculite packing. The inverted L-shaped metal gasket provides a primary seal; its corrugated sealing structure ensures no jamming at high temperatures while maintaining reliable sealing performance and reducing direct erosion of the packing by chlorinated molten salt media. The C-shaped metal sealing ring provides a secondary seal; its internal spring provides effective preload at various temperatures, isolating the media. The vermiculite packing provides a triple seal, offering high sealing reliability.

[0017] The wave-shaped sealing structure at the inner diameter of the inverted L-shaped metal gasket is a semi-circular multi-seal contact point. The contact point and valve stem use a transition fit. Under high-temperature operating conditions, expansion forms an effective metal seal with the valve stem, preventing the medium from passing through the gap between the valve stem and valve body and causing packing erosion. Under normal-temperature maintenance conditions, a certain clearance exists between the two, facilitating the replacement of the inverted L-shaped metal seal. The valve body support portion of the inverted L-shaped gasket uses a hollow support to facilitate medium backflow and prevent medium crystallization and jamming. The valve body and valve cover are integrally forged, avoiding inherent defects from casting and mitigating casting defects, making the entire valve safer and more reliable.

[0018] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

Claims

1. A temperature-adaptive multi-seal structure, comprising a packing gland and a valve cover, characterized in that, The stuffing box of the valve cover contains vermiculite packing, an inner-opening C-type metal sealing ring, a C-type metal sealing ring pressure ring, an outer-opening C-type metal sealing ring, and an inverted L-shaped metal sealing gasket. The corrugated sealing surface of the inverted L-shaped metal sealing gasket is covered with mica material. The inner-opening C-type metal sealing ring and the outer-opening C-type metal sealing ring are pressed together by the C-type metal sealing ring pressure ring. The positive pressure of the C-type metal sealing ring pressure ring and the sealing force of the vermiculite packing come from the stuffing box.

2. The temperature-adaptive multi-sealing structure according to claim 1, characterized in that... The inner-opening C-type metal sealing ring and the outer-opening C-type metal sealing ring include an inner metal spring and an outer metal covering layer.

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