A super-high temperature angle valve

Abstract

A super-high temperature angle valve, the valve core of which mainly consists of a lower valve stem, a heat insulation pipe, a sealing layer, and a connecting block; the sealing end of the lower valve stem is a cylindrical boss, and the upper end is a threaded rod. The outer periphery of the lower valve stem is sleeved with a heat insulation pipe, and the shape of the heat insulation pipe at the sealing end of the lower valve stem is a spherical valve head. The spherical valve head and the conical surface of the inner ring of the valve seat are developed to form a sealing pair; the cylindrical boss end of the lower valve stem is filled with zircon sand mixed with silica sol as a sealing layer for sealing, and the sealing layer is connected to the inner side of the heat insulation pipe without a gap; after the upper ends of the lower valve stem and the heat insulation pipe are loaded with gaskets, the lower end of the lower valve stem is threadedly connected to the connecting block; the inner cavity of the valve body is entirely provided with a heat insulation layer; and the valve seat is arranged on the heat insulation layer inside the valve body. The present invention adopts an integrated modular design of the valve core and the valve stem that is easy to replace, a nested structure of the valve seat, a compact inner part structure, a smaller body shape of the valve body, and inexpensive material selection, saving costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to an ultra-high temperature angle valve. Background Art

[0002] Ultra-high temperature valves are applied in fields such as chemical industry, metallurgy, aerospace, etc. Generally, when the temperature of the working medium is as high as 1600 °C or above, the valve core inside the high-temperature valve is quickly burned or even melted, the valve cannot be sealed when opened and closed, and failures occur during the use of the valve, which is a major hidden danger in the device pipeline. Traditional ultra-high temperature valves adopt a water-cooling design at the valve core and valve stem parts, with a complex structure, larger inner cavity dimensions of the valve body and valve cover, and other methods still need to be adopted for heat insulation at the sealing surface part, resulting in higher costs, larger installation space, and shorter service life. Summary of the Invention

[0003] The present invention provides an ultra-high temperature angle valve, and provides a valve core and valve seat structure with reliable sealing and easy replacement to ensure the stable and safe operation of the device pipeline system.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] An ultra-high temperature angle valve includes a valve body, a valve seat, and a valve core. The valve core is mainly composed of a lower valve stem, a heat insulation pipe, a sealing layer, and a connecting block; the sealing end of the lower valve stem is a cylindrical convex platform, and the upper end is a threaded rod. The outer periphery of the lower valve stem is sleeved with a heat insulation pipe, and the outer shape of the heat insulation pipe at the sealing end of the lower valve stem is a spherical valve head, and a sealing pair is formed by developing the spherical valve head and the conical surface of the inner ring of the valve seat; the cylindrical convex platform end of the lower valve stem is filled with zircon sand mixed with silica sol as a sealing layer for sealing, and there is no gap between the sealing layer and the inner side of the heat insulation pipe; and the upper ends of the lower valve stem and the heat insulation pipe are loaded with gaskets and then the lower valve stem and the lower end of the connecting block are threadedly connected; the valve seat is a combined part formed by nesting an inner ring of the valve seat and an outer ring of the valve seat; the inner cavity of the valve body is all provided with a heat insulation layer; and the valve seat is arranged on the heat insulation layer inside the valve body.

[0006] The outer shape of the inner ring of the valve seat is an octagon, and the outer shape section is an inverted cone; the outer ring of the valve seat is a square-shaped split ring in two halves, and the outer shape section is a cone.

[0007] A gap is provided between the lower valve stem and the heat insulation pipe to form a moving fit.

[0008] A positioning pin is provided at the threaded connection section between the lower valve stem and the connecting block.

[0009] The present invention adopts an integrated modular and easily replaceable design of the valve core and the valve stem, and a nested valve seat structure. The connecting part between the valve disc and the valve stem is simplified to a single part, reducing the processing procedures, decreasing the weight of the internal parts, and saving costs. The internal parts are structurally compact, the valve body is relatively small in size, and the selected materials are inexpensive. Additionally, the valve core of the present invention does not adopt a water-cooling structure design, which can ensure the minimum temperature loss at the valve outlet to the greatest extent. An insulating pipe made of zircon sand is sleeved on the lower valve stem. The main component of zircon sand is zirconium silicate (ZrSiO4), and its melting point ranges from 2190°C to 2420°C depending on the impurities contained, with a small thermal expansion rate, which can effectively insulate working conditions with a temperature ≤ 2300K. After the valve stem and the insulating pipe are assembled, air with the same pressure as the medium is filled into the gap between the two, mainly to ensure the pressure balance inside and outside the insulating pipe and prevent it from being crushed.

[0010] The present invention is applicable to high-temperature nitrogen and high-temperature air conditions with CL150 or PN ≤ 25, a working temperature ≤ 2300K, and a nominal size DN ≥ 80. Brief Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of the present invention;

[0012] Figure 2 is a schematic diagram of the sealing structure between the spherical valve head and the valve seat in the present invention;

[0013] Figure 3 is a schematic diagram of the upper end structure of the valve core in the present invention;

[0014] Figure 4 is a schematic top view structure diagram of the valve seat assembly in the present invention;

[0015] In the figure: 1 - valve body, 2 - insulating layer, 3 - valve seat, 3a - inner ring of the valve seat, 3b - outer ring of the valve seat, 4 - valve core, 5 - sealing layer, 6 - lower valve stem, 7 - insulating pipe, 7a - spherical valve head, 8 - gasket, 9 - positioning pin, 10 - connecting block, 11 - valve cover, 12 - disc spring, 13 - bracket, 14 - upper valve stem, 15 - pneumatic device, 16 - guiding block, 17 - bolt, 18 - packing gland, 19 - packing sleeve, 20 - high-temperature packing, 21 - packing spacer ring, 22 - water-cooled jacket. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the specific drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0017] Refer to Figure 1, A super-high temperature angle valve, comprising a valve body 1, a valve seat 3, and a valve core 4. The valve core 4 penetrates through the valve body 1 and the valve cover 11 and extends into the support 13. The upper connecting block 10 thereof is fixedly connected to the upper valve stem 14 through a guiding block 16, and the upper valve stem 14 extends into the pneumatic device 15. High-temperature packing 20 is installed on the upper and lower parts of the stuffing box on the upper part of the valve cover 11, and a packing spacer ring 21 is installed in the middle; bolts 17 equipped with disc springs 12 pass through the packing pressing plate 18 and the packing sleeve 19 and are tightened with the valve cover 11.

[0018] Refer to Figure 2 , Figure 3 , The valve core 4 is mainly composed of a lower valve stem 6, a heat insulation pipe 7, a sealing layer 5, and a connecting block 10; the sealing end of the lower valve stem 6 is a cylindrical boss, and the diameter of the cylindrical boss should be ≥ 1.5 times the diameter of the lower valve stem 6. The function of the boss is to effectively position the spherical valve head 7a of the heat insulation pipe 7. The upper end is a threaded rod. The outer periphery of the lower valve stem 6 is sleeved with the heat insulation pipe 7. The outer shape of the heat insulation pipe 7 at the sealing end of the lower valve stem 6 is a spherical valve head 7a. The spherical valve head 7a and the conical surface of the valve seat inner ring 3a of the valve seat 3 are developed to form a sealing pair; the cylindrical boss end of the lower valve stem 6 is filled and sealed with zircon sand mixed with silica sol to form a sealing layer 5. The sealing layer 5 is connected to the inner side of the heat insulation pipe 7 without a gap; after the upper ends of the lower valve stem 6 and the heat insulation pipe 7 are installed in a gasket 8 (the gasket 8 is made of asbestos rope, and its function is to avoid damage when the connecting block 10 presses the heat insulation pipe 7), the lower valve stem 6 and the lower end of the connecting block 10 are threadedly connected; the valve seat 3 is a composite part formed by nesting a valve seat inner ring 3a and a valve seat outer ring 3b; the inner cavity of the valve body 1 is all provided with a heat insulation layer 2; and the valve seat 3 is arranged on the heat insulation layer 2 inside the valve body 1.

[0019] The lower valve stem 6 and the upper valve stem 14 are made of heat-resistant stainless steel F316H.

[0020] Please refer to Figure 4 , The outer shape of the valve seat inner ring 3a is an octagon, and the outer cross-section is an inverted cone; the valve seat outer ring 3b is a square-shaped split ring in two halves, and the outer cross-section is a cone. The shape of the inner hole of the valve seat outer ring 3b is consistent with the outer shape of the valve seat inner ring 3a to ensure that the height is well-matched after the two are nested. When the valve seat inner ring 3a is subjected to the upward medium force, it is transmitted to the valve seat outer ring 3b, and the valve seat outer ring 3b will generate a reaction force on the valve seat inner ring 3a to keep the valve seat inner ring 3a from being washed away and displaced by the medium. The valve seat inner ring 3a and the valve seat outer ring 3b are both made of sintered zircon sand and are replaced every cycle. This valve seat nesting structure solves the problem of fixing the valve seat on the valve body and is convenient for replacement and maintenance. This design of the nested shape of the valve seat inner ring and outer ring ensures the balance of the forces between the valve seat inner ring and outer ring, solves the problem that the valve seat and the valve body heat insulation layer cannot be welded, and enables the valve seat to be firmly nested in the valve body heat insulation layer without falling off, thereby ensuring the effective sealing performance of the valve in super-high temperature media.

[0021] The heat-insulating pipe 7, the inner ring 3a of the valve seat, and the outer ring 3b of the valve seat are all made of zircon sand. The main component of zircon sand is zirconium silicate (ZrSiO4), and its melting point is 2190°C to 2420°C depending on the impurities contained. It has a small thermal expansion rate and can effectively insulate the working conditions with a working temperature ≤ 2300K.

[0022] A gap is provided between the lower valve stem 6 and the heat-insulating pipe 7 to form a moving fit. This gap is 2 mm, which keeps the pressure balance inside and outside the heat-insulating pipe 7. The heat-insulating pipe 7 and the lower valve stem 6 are in a moving fit, which is convenient for replacing the heat-insulating pipe 7. It is replaced once per cycle. The heat-insulating pipe 7 is made of sintered zircon sand and processed by boring and grinding, so the smoothness of the contact part with the high-temperature packing 20 can be guaranteed.

[0023] A positioning pin 9 is provided on the threaded connection section of the lower valve stem 6 and the connecting block 10 to prevent the lower valve stem 6 and the connecting block 10 from rotating.

[0024] The heat-insulating layer 2 is made of refractory paint. On the heat-insulating lining layer of 80 - 100 mm, a zircon sand layer mixed with wire mesh and silica sol of 20 - 30 mm is further provided. The safety service life of the valve body is guaranteed through the design of the composite heat-insulating layer.

[0025] A water-cooled jacket 22 is provided on the outer wall of the valve body 1 to meet the requirement that the temperature of the outer wall of the valve body 1 reaches 120°C during the operation of the valve under some working conditions. Water cooling ensures a one-way flow of in and out. The cooling water is clean water, and the circulation is regularly checked for normality and replaced regularly.

[0026] During the valve opening process, the valve core 4 rises. The displacement when the valve head completely leaves the outlet flow channel is set as the valve opening height. The signal is transmitted to the controller of the pneumatic device 15, and the guiding block 16 stops moving up on the guide rail of the bracket 13. The high-temperature medium enters the valve cavity at the maximum flow rate. The heat-insulating layer 2 of the valve cavity and the valve seat 3 play a protective role. The heat-insulating pipe 7 and the heat-insulating seal layer 5 of the valve stem 6 play a protective role. The middle flange and the valve stem 6 are tightly sealed. When the valve is closed, the spherical valve head 7a of the valve core 4 descends and presses into the conical surface of the inner ring 3a of the valve seat to ensure good sealing.

Claims

1. A super-high temperature angle valve, comprising a valve body (1), a valve seat (3), and a valve core (4), characterized in that: The spool (4) mainly consists of a lower valve stem (6), a heat insulation tube (7), a sealing layer (5), and a connecting block (10); the sealing end of the lower valve stem (6) is a cylindrical boss, and the upper end is a threaded rod. The outer periphery of the lower valve stem (6) is sleeved with a heat insulation tube (7). The shape of the heat insulation tube (7) at the sealing end of the lower valve stem (6) is a spherical valve head (7a). The spherical valve head (7a) and the conical surface of the inner ring (3a) of the valve seat (3) are developed to form a sealing pair; the cylindrical boss end of the lower valve stem (6) is closed with zircon sand mixed with silica sol as the sealing layer (5). The sealing layer (5) is connected to the inner side of the heat insulation tube (7) without a gap; after the upper ends of the lower valve stem (6) and the heat insulation tube (7) are inserted into the gasket (8), the lower end of the lower valve stem (6) is threadedly connected to the connecting block (10); the valve seat (3) is a composite part formed by nesting the inner ring (3a) of the valve seat and the outer ring (3b) of the valve seat; the inner cavity of the valve body (1) is entirely provided with a heat insulation layer (2); and the valve seat (3) is arranged on the heat insulation layer (2) inside the valve body (1).

2. The ultra-high temperature angle valve according to claim 1, wherein: The outer shape of the inner ring (3a) of the valve seat is an octagon, and the outer cross-section is an inverted cone; the outer ring (3b) of the valve seat is a square-shaped split ring in two halves, and the outer cross-section is a cone.

3. The ultra-high temperature angle valve according to claim 2, characterized in that: The heat insulation tube (7), the inner ring (3a) of the valve seat, and the outer ring (3b) of the valve seat are all made of zircon sand.

4. The ultra-high temperature angle valve according to claim 1, characterized in that: A gap is provided between the lower valve stem (6) and the heat insulation tube (7) to form a moving fit.

5. A super-high temperature angle valve according to claim 1, characterized in that: A positioning pin (9) is provided on the threaded connection section between the lower valve stem (6) and the connecting block (10).

6. The ultra-high temperature angle valve according to claim 1, characterized in that: The heat insulation layer (2) is made of refractory paint. A layer of zircon sand mixed with expanded metal lath + silica sol with a thickness of 20 - 30 mm is further provided on the heat insulation lining layer of 80 - 100 mm.

7. A super-high temperature angle valve according to any one of claims 1-6, characterized in that: A water-cooled jacket (22) is provided on the outer wall of the valve body (1).

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