High-temperature rotary sealing joint for conveying molten liquid metal

Abstract

The invention provides a high-temperature rotary sealing joint for conveying molten liquid metal, which comprises a lower flange, a shell, an upper flange, a lining pipe, a sealing assembly, an inner gland, a roller, a supporting assembly, a first connecting piece and a second connecting piece, and is characterized in that the lining pipe is used for connecting the upper flange and the lower flange and is made of a silicon nitride ceramic material; an inner cavity of the lining pipe is a circulation channel of high-temperature liquid metal, the inner gland is connected with the lower flange, the roller is located among the inner gland, the shell and the lower flange, the inner gland and a step of the shell form a limit for fixing axial displacement of the lower flange, and the sealing assembly is located in a sealing groove of the upper flange and a sealing groove of the lower flange. The supporting assemblies are located at the upper end and the lower end of the roller, the first connecting piece is used for connecting the inner gland and the lower flange, and the second connecting piece is used for connecting the shell and the upper flange. Through relative movement of the upper flange and the lower flange, relative rotation of the siphons on the two sides is achieved, and liquid metal is conveyed at the high temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature dynamic sealing, and more particularly to a high-temperature rotary sealing joint for transporting molten liquid metal. Background Art

[0002] In the fields of titanium and magnesium metallurgy, it is often necessary to transport high-temperature liquid magnesium from one device to other equipment. Since the temperature of liquid magnesium is 650 - 850°C, in the industry, metal pipes made of stainless steel or carbon steel are generally used as siphons for transporting liquid magnesium, and the siphons are installed in a sealed ladle. The transportation of liquid magnesium is achieved by pressurizing or evacuating the sealed ladle. The metal siphon for transporting liquid magnesium is a pipe with a fixed shape. After long-term use at high temperatures, the pipe will deform. Once deformation occurs, the docking position with the equipment will shift. For devices that need to be docked at a fixed position, it can no longer be used, and it is necessary to replace the siphon or take other measures to avoid the deformation of the siphon.

[0003] The prior art with the publication number CN104019304B discloses a high-temperature rotary joint, which includes a housing and an outer pipe. The outer pipe is installed in the inner hole of the housing; a sealing step is provided on the outer pipe. The outer pipe and the tail end of the housing are sealed and connected through a first movable sealing connection assembly, and the outer pipe and the front end of the housing are sealed and connected through a second movable sealing connection assembly. In the first movable sealing connection assembly, a first spherical ring, a middle cover, and a cylindrical ring are sequentially sleeved on the tail of the outer pipe. The inner end face of the first spherical ring is connected to one side of the sealing step through a spring positioning assembly. The outer spherical surface of the first spherical ring cooperates with the inner surface of the middle cover, and the inner surface of the middle cover cooperates with the outer spherical surface of the first spherical ring; the cylindrical ring is installed in the central hole at the outer end of the middle cover and does not rotate with the outer pipe; the flange part of the middle cover is connected to the tail end of the housing; the second movable sealing connection is similar in structure to the second movable sealing connection assembly and is symmetrically arranged. In the existing rotary joint, the inner pipe is mainly fixed by the elastic force of the spring, and then cooperates with the sealing ring to achieve the effect of sealed transportation. However, both the spring and the sealing ring cannot withstand high temperatures. Once the temperature exceeds 400°C, the spring and the sealing ring will fail, resulting in the rotary joint no longer having good sealing performance, so the rotary joint cannot be used normally. That is, the high-temperature rotary joint in the prior art can only transport liquids at 200 - 300°C and cannot transport liquid magnesium at 650 - 850°C. Summary of the Invention

[0004] In view of this, the present invention aims to provide a high-temperature rotary seal joint for transporting molten liquid metal, so as to solve the problem that in the existing rotary joint, the inner tube is mainly fixed by the elastic force of a spring, and then cooperates with a sealing ring to achieve the effect of sealed transportation. However, neither the spring nor the sealing ring can withstand high temperatures. Once the temperature exceeds 400°C, the spring and the sealing ring will both fail, resulting in the rotary joint no longer having good sealing performance, so that the rotary joint cannot be used normally. That is, the high-temperature rotary joint in the existing technology can only transport liquids at 200-300°C and cannot transport liquid magnesium at 650-850°C.

[0005] To achieve the above object, the technical solution of the present invention is realized as follows:

[0006] A high-temperature rotary seal joint for transporting molten liquid metal, comprising a lower flange, a housing, an upper flange, a lining tube, a sealing assembly, an inner gland, rollers, a support assembly, a first connecting member, and a second connecting member. The lining tube is used to connect the upper flange and the lower flange, and the material of the lining tube is silicon nitride ceramic material. The inner cavity of the lining tube is a flow channel for high-temperature liquid metal. The inner gland is connected to the lower flange. The rollers are located between the inner gland, the housing, and the lower flange. The step between the inner gland and the housing forms a limit for fixing the axial displacement of the lower flange. The sealing assembly is located in the sealing grooves of the upper flange and the lower flange. The support assembly is located at the upper and lower ends of the rollers. The first connecting member is used to connect the inner gland and the lower flange, and the second connecting member is used to connect the housing and the upper flange.

[0007] In this setting, rollers are provided to support the lower flange, enabling the lower flange to rotate relative to the upper flange. The lining tube is made of silicon nitride material, which has high temperature resistance and a large wetting angle with liquid metal, and the surface is not easily adhered to by metal, effectively realizing the transportation of liquid metal. The lower flange is limited by the inner gland and the housing to improve the reliability of the rotation of the lower flange. By setting the first connecting member and the second connecting member, the connection stability between the upper flange and the lower flange is improved, and then the upper flange and the lower flange move relative to each other. By setting the sealing assembly, the sealing performance between the siphon tube and the upper flange and the lower flange is improved, and the transportation efficiency of liquid metal is increased. In short, through the stable and reliable relative movement of the upper and lower flanges of the present invention, the siphon tubes on both sides can rotate relative to each other, and the transportation of liquid metal at high temperatures is efficiently realized.

[0008] Further, the lower flange is of a necked flange structure.

[0009] Further, the lower flange includes a cylindrical part and a plate part that are connected to each other. The lower end of the cylindrical part is provided with first bolt holes, and the siphon tube is connected by inserting bolts into the first bolt holes. The upper end of the plate part is provided with second bolt holes, and the inner gland is connected by inserting bolts into the second bolt holes.

[0010] This setting can improve the connection stability between the lower flange and the siphon.

[0011] Furthermore, the upper flange includes inner ring bolt holes and outer ring bolt holes. The outer ring bolt holes connect the upper flange to the siphon through bolts, and the inner ring bolt holes connect the upper flange to the housing through bolts.

[0012] This setting improves the connection stability between the upper flange and the lower flange.

[0013] Furthermore, the housing includes a first section, a second section, and a third section connected in sequence. The inner diameter of the first section is smaller than that of the second section, and the inner diameter of the second section is smaller than that of the third section. The housing forms a three-layer stepped structure.

[0014] This setting can better limit the rollers.

[0015] Furthermore, the inner gland is located on the step formed by the first section and the second section, and the rollers are arranged at the upper end of the step formed by the second section and the third section.

[0016] This setting can improve the stability of the rollers, thereby improving the reliability of the relative movement between the upper and lower flanges.

[0017] Furthermore, the third section is in contact with the lower flange.

[0018] Furthermore, the sealing assembly is a graphite gasket, which is installed in the gasket grooves of the upper flange and the lower flange.

[0019] In this setting, the graphite gasket has good high-temperature resistance, so it can improve the heat resistance of this rotary joint.

[0020] Furthermore, the support assembly is a roller cage, which is used to fix the rollers to prevent the rollers from shifting during rotation.

[0021] Furthermore, both the first connecting piece and the second connecting piece are bolts.

[0022] Compared with the prior art, the high-temperature rotary sealing joint for transporting molten liquid metal described in the present invention has the following advantages:

[0023] 1) The present invention is provided with rollers to support the lower flange, enabling the lower flange to rotate relative to the upper flange; the inner lining pipe is made of silicon nitride material, which has high temperature resistance and a large wetting angle with liquid metal, and it is not easy for the surface to adhere to metal, effectively realizing the transportation of liquid metal. The lower flange is limited by the inner gland and the housing to improve the reliability of the rotation of the lower flange. By setting the first connecting piece and the second connecting piece, the connection stability between the upper flange and the lower flange is improved, and thus the upper flange and the lower flange move relative to each other. By setting the sealing assembly, the sealing performance between the siphon pipe and the upper flange and the lower flange is improved, and the transportation efficiency of liquid metal is increased. In short, through the stable and reliable relative movement of the upper and lower flanges, the siphon pipes on both sides can rotate relative to each other, and the transportation of liquid metal at high temperature is efficiently realized.

[0024] 2) For the high-temperature rotary seal joint of the present invention, by installing it on the siphon pipe for transporting high-temperature metal, the siphon pipes at both ends of the connection side of the high-temperature rotary seal joint can rotate relative to each other, so that the fixed metal siphon pipe can achieve rotational displacement to meet the requirements of different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of a high-temperature rotary seal joint for transporting molten liquid metal according to the present invention;

[0026] Figure 2 is an overall structural schematic diagram of a high-temperature rotary seal joint for transporting molten liquid metal according to the present invention;

[0027] Figure 3 is a structural schematic diagram of the lower flange of the present invention;

[0028] Figure 4 is a cross-sectional view of the lower flange of the present invention;

[0029] Figure 5 is a structural schematic diagram of the housing of the present invention;

[0030] Figure 6 is a cross-sectional view of the housing of the present invention;

[0031] Figure 7 is a connection schematic diagram of the high-temperature rotary seal joint and the siphon pipe of the present invention.

[0032] Description of the Reference Numerals:

[0033] 1 - Lower flange, 11 - Cylindrical body part, 111 - First bolt hole, 12 - Plate body part, 121 - Second bolt hole, 2 - Shell, 21 - First section, 211 - Third bolt hole, 22 - Second section, 23 - Third section, 3 - Upper flange, 31 - Inner ring bolt hole, 32 - Outer ring bolt hole, 4 - Liner pipe, 41 - Small flange, 5 - Sealing assembly, 6 - Inner gland, 7 - Roller, 8 - Support assembly, 9 - First connecting piece, 10 - Second connecting piece. Detailed implementation manners

[0034] To make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the following describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. In addition, a brief description of the directions involved in the following specific implementation manners is as follows: The directions or positional relationships indicated by "upper", "lower", "left", "right", etc. mentioned in the embodiments refer to the directions or positional relationships shown in the accompanying drawings.

[0035] The present invention provides a high - temperature rotary seal joint for transporting molten liquid metal, including a lower flange 1, a shell 2, an upper flange 3, a liner pipe 4, a sealing assembly 5, an inner gland 6, a roller 7, a support assembly 8, a first connecting piece 9, and a second connecting piece 10. The liner pipe 4 is used to connect the upper flange 3 and the lower flange 1, and the material of the liner pipe is silicon nitride ceramic material. The inner cavity of the liner pipe is a flow channel for high - temperature liquid metal. The inner gland 6 is connected to the lower flange. The roller 7 is located between the inner gland, the shell 2, and the lower flange 1. The step between the inner gland and the shell forms a limit for fixing the axial displacement of the lower flange. The sealing assembly 5 is located in the sealing grooves of the upper flange and the lower flange. The support assembly is located at the upper and lower ends of the roller. The first connecting piece 9 is used to connect the inner gland 6 and the lower flange 1, and the second connecting piece 10 is used to connect the shell 2 and the upper flange 3. In this setting, rollers are provided to support the lower flange, enabling the lower flange to rotate relative to the upper flange; the liner pipe uses silicon nitride material, which has high temperature resistance and a large wetting angle with liquid metal, and the surface is not easily adhered to metal, effectively realizing the transportation of liquid metal. By limiting the lower flange through the inner gland and the shell, the reliability of the rotation of the lower flange is improved. By setting the first connecting piece and the second connecting piece, the connection stability between the upper flange and the lower flange is improved, and then the upper flange and the lower flange move relative to each other. By setting the sealing assembly, the sealing performance between the siphon pipe and the upper flange and the lower flange is improved, and the transportation efficiency of liquid metal is increased. In short, through the stable and reliable relative movement of the upper and lower flanges, the siphon pipes on both sides can rotate relative to each other, realizing the transportation of liquid metal at high temperature.

[0036] Preferably, both the first connecting piece 9 and the second connecting piece 10 are bolts.

[0037] Specifically, the upper part of the inner liner tube 4 is provided with a small flange 41. The inner liner tube 4 is installed through the upper flange 3 to the lower flange. The length of the inner liner tube exceeds the maximum distance between the upper flange and the lower flange by 2-5 mm. As Figure 2 shown, the length by which the bottom of the inner liner tube protrudes relative to the lower flange.

[0038] Specifically, a clearance fit is adopted between the inner liner tube and the upper flange and the lower flange. The clearance is filled with high-temperature grease, and the inner liner tube can move relative to the upper flange and the lower flange.

[0039] Preferably, the lower flange 1 is a necked flange structure. The lower flange 1 includes a cylindrical part 11 and a plate part 12 that are connected to each other. A first bolt hole 111 is provided at the lower end of the cylindrical part 11, and a siphon tube is connected by inserting a bolt into the first bolt hole 111. A second bolt hole 121 is provided at the upper end of the plate part 12, and an inner gland 6 is connected by inserting a bolt into the second bolt hole 121.

[0040] Specifically, the upper flange 3 includes an inner ring bolt hole 31 and an outer ring bolt hole 32. The outer ring bolt hole 32 connects the upper flange 3 to the siphon tube through a bolt, and the inner ring bolt hole 31 connects the upper flange 3 and the housing 2 through a bolt.

[0041] Specifically, the housing 2 includes a first section 21, a second section 22, and a third section 23 that are connected in sequence. The first section is in contact with the upper flange, and the third section is in contact with the lower flange. The inner diameter of the first section 21 is smaller than the inner diameter of the second section 22, and the inner diameter of the second section 22 is smaller than the inner diameter of the third section 23. This setting makes the housing form a three-layer stepped structure. The inner gland 6 is located on the step formed by the first section 21 and the second section 22, and the roller 7 is arranged at the upper end of the step formed by the second section and the third section.

[0042] Specifically, the third section 23 is in contact with the lower flange 1.

[0043] Specifically, a third bolt hole 211 is provided on the housing 2. The third bolt hole is used to connect the upper flange and the housing, and the third bolt hole is located on the upper end face of the first section 21.

[0044] Specifically, the sealing assembly 5 is a graphite gasket, which is installed in the gasket grooves of the upper flange and the lower flange.

[0045] Specifically, the support assembly 8 is a roller cage, which is used to fix the roller to prevent the roller from shifting during rotation.

[0046] The main features of the high-temperature rotary sealing joint of the present invention are as follows: The upper flange and the lower flange are used to connect the siphon. The inner lining pipe connects the upper flange and the lower flange. The inner cavity of the inner lining pipe is the flow channel for high-temperature liquid metal. The material of the inner lining pipe is silicon nitride ceramic material. Silicon nitride material has high temperature resistance and a large wetting angle with liquid metal, and it is not easy to adhere to metal on the surface. A clearance fit is adopted between the inner lining pipe and the upper and lower flanges, and high-temperature grease is filled in the clearance, and the inner lining pipe can rotate relative to the upper and lower flanges. A circle of rollers is installed inside the housing to support the lower flange through the rollers, and the lower flange can rotate relative to the upper flange.

[0047] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined by the claims.

Claims

1. A high-temperature rotary seal joint for conveying molten liquid metal, characterized in that, It includes a lower flange (1), a housing (2), an upper flange (3), a lining tube (4), a sealing assembly (5), an internal gland (6), rollers (7), a support assembly (8), a first connecting member (9), and a second connecting member (10). The lining tube (4) is used to connect the upper flange (3) and the lower flange (1), and the material of the lining tube (4) is silicon nitride ceramic material. The inner cavity of the lining tube (4) is a flow channel for high-temperature liquid metal. The internal gland (6) is connected to the lower flange (1). The rollers (7) are located between the internal gland (6), the housing (2), and the lower flange (1). The step formed by the internal gland (6) and the housing (2) provides a limit to fix the axial displacement of the lower flange (1). The sealing assembly (5) is located in the sealing grooves of the upper flange (3) and the lower flange (1). The support assembly (8) is located at the upper and lower ends of the rollers (7). The first connecting member (9) is used to connect the internal gland (6) and the lower flange (1), and the second connecting member (10) is used to connect the housing (2) and the upper flange (3).

2. The high-temperature rotary seal joint for conveying molten liquid metal according to claim 1, wherein The lower flange (1) is a necked flange structure.

3. The high-temperature rotary seal joint for conveying molten liquid metal according to claim 1, wherein The lower flange (1) includes a cylinder part (11) and a plate part (12) that are connected to each other. A first bolt hole (111) is provided at the lower end of the cylinder part (11), and a siphon tube is connected by inserting a bolt into the first bolt hole (111). A second bolt hole (121) is provided at the upper end of the plate part (12), and the internal gland (6) is connected by inserting a bolt into the second bolt hole (121).

4. A high-temperature rotary seal joint for transporting molten liquid metal according to claim 1, characterized in that, The upper flange (3) includes an inner ring bolt hole (31) and an outer ring bolt hole (32). The outer ring bolt hole (32) is used to connect the upper flange (3) and the siphon tube by bolts, and the inner ring bolt hole (31) is used to connect the upper flange (3) and the housing (2) by bolts.

5. A high-temperature rotary seal joint for transporting molten liquid metal according to claim 1, wherein, The housing (2) includes a first section (21), a second section (22), and a third section (23) that are connected in sequence. The inner diameter of the first section (21) is smaller than the inner diameter of the second section (22), and the inner diameter of the second section (22) is smaller than the inner diameter of the third section (23). The housing (2) forms a three-layer stepped structure.

6. The high-temperature rotary seal joint for conveying molten liquid metal according to claim 5, wherein, The internal gland (6) is located on the step formed by the first section and the second section, and the rollers are arranged at the upper end of the step formed by the second section and the third section.

7. A high-temperature rotary seal joint for transporting molten liquid metal according to claim 6, characterized in that, The third section (23) is in contact with the lower flange (1).

8. A high-temperature rotary seal joint for transporting molten liquid metal according to claim 1, characterized in that, The sealing assembly (5) is a graphite gasket and is installed in the gasket grooves of the upper flange and the lower flange.

9. The high-temperature rotary seal joint for transporting molten liquid metal according to claim 1, wherein, The support assembly (8) is a roller cage and is used to fix the rollers to prevent them from shifting during rotation.

10. A high-temperature rotary seal joint for transporting molten liquid metal according to claim 1, characterized in that, The first connecting member (9) and the second connecting member (10) are both bolts.

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