Extremely high and low temperature metal sealing ball valve

Abstract

The extreme high and low temperature metal sealing ball valve is mainly composed of a motor, a transmission box, a cone bearing assembly, a transmission rod, a bolt and nut, sealing filler, a valve body, a ball body, a connecting flange assembly, a composite metal seal and a rolling bearing combined structure, when the ball valve is opened, the motor is started, torque for driving the transmission rod to rotate drives the ball body to rotate, and when the ball valve is closed, the sealing filler is closed. And the motor reversely operates. If the motor fails, the hand wheel can be rotated to open and close the ball valve. The metal sealing ball valve is suitable for being rapidly opened and closed, the applicable temperature range is from-70 DEG C to 350 DEG C, the advantages of replacing sliding friction with rolling, the bearing and reliability of a bearing system, the composite metal sealing design, sealing compensation and the like are combined, a transmission system and a ball sealing structure of the ball valve structure are relatively independent, and the service life of the ball valve structure is prolonged. The overall working stability of the ball valve cannot be affected by high and low temperature environments, and the problems of poor sealing wear resistance and sealing performance, short service life and high labor intensity of opening and closing the ball valve at extreme temperatures can be effectively solved.

Description

Technical Field

[0001] The present invention relates to a quick-opening and closing ball valve applicable to extreme temperatures. Background Art

[0002] Currently, conventional ball valves at home and abroad cannot meet the usage requirements under extreme temperatures. Some designed high and low temperature ball valves have defects such as slow opening and closing, easy failure of rubber seals, poor heat dissipation, complex structural design, difficult manufacturing, inconvenient operation, and short service life. With the change of environmental climate and the fluid transportation limitations under harsh working conditions, there is an urgent need to design a ball valve that can be quickly closed and opened under extreme temperatures, has good heat dissipation and heat preservation properties, and a long seal life.

[0003] Based on these defects and considering the above situations, this patent designs a quick-opening and closing metal-sealed ball valve applicable to extreme temperatures, with an applicable temperature range of -70°C to 350°C. From the aspects of design structure, manufacturing feasibility, and installation dimensions, this invention combines the advantages of replacing sliding friction with rolling, the load-bearing and reliability of the bearing system, composite metal seal design, and seal compensation. The transmission system of the ball valve structure is relatively independent of the sphere seal structure, and high and low temperature environments will not affect the overall working stability of the ball valve. It has the characteristics of stable operation and high reliability, and can effectively solve the problems of poor seal wear resistance, poor sealing performance, short service life, and high labor intensity of opening and closing the ball valve under extreme temperatures. The structure of the present invention is convenient for processing, assembly, maintenance, and disassembly, has strong adaptability, and has the advantages of safety and reliability. Summary of the Invention

[0004] The purpose of the present invention is: to effectively solve the problems of wear resistance and sealing performance of the oscillation assembly. The present invention relates to an extreme high and low temperature metal-sealed ball valve, mainly designing a tapered bearing drive structure, a seal compensation structure, and a rolling bearing combination structure, enhancing the service life of the ball valve and facilitating the quick opening and closing of the ball valve. The new ball valve structure has the characteristics of stable operation and long service life.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: An extreme high and low temperature metal-sealed ball valve, generally speaking, mainly consists of a motor 1, a handwheel 2, a transmission box 3, a tapered bearing assembly 4, a transmission rod 5, a first bolt and nut 6, a flange 7, a sealing packing 8, a valve body flange 9, a second bolt and nut 10, a valve body 11, a connecting screw 12, a bottom flange 13, a connecting flange assembly I, a composite metal seal II, and a rolling bearing combination structure III. The motor 1 is installed on the upper surface of the shell of the transmission box 3. The tapered bearing assembly 4 is sleeved on the outer shell of the transmission rod 5 and is threadedly fixed to the transmission box 3. The inner ring of the bearing of the tapered bearing assembly 4 is sleeved on the outer ring of the transmission rod 5. The flange 7 and the valve body flange 9 are fastened and connected by the first bolt and nut 6, and the flange 7 and the valve body flange 9 are fastened and connected by the second bolt and nut 10. The tapered bearing assembly 4 is provided with two pairs of tapered bearings, and an outer bearing housing is provided.

[0006] When the ball valve is opened, the motor is started, and the transmission box and the tapered bearing assembly drive the transmission rod to transmit. The torque of the rotating transmission rod drives the sphere to rotate. When the ball valve is closed, the motor runs in the reverse direction. If the motor fails, the handwheel 2 can be rotated to open or close the ball valve at the same time.

[0007] The connecting flange assembly I of the extreme high and low temperature metal sealed ball valve is composed of a valve body 11, a gland 14, a gland seal assembly 15, a rectangular sealing ring 16, and a connecting pin 17. The gland seal assembly 15 is composed of 4 pieces of V-shaped cloth-packed packing arranged in combination and installed in the annular groove for installing the gland seal assembly 15. The valve body 11 and the gland 14 are connected by the connecting pin 17. The rectangular sealing ring 16 is installed in the rectangular groove of the valve body 11. The V-shaped cloth-packed packing is processed and formed from high and low temperature resistant cloth-packed nitrile rubber.

[0008] The extreme high and low temperature metal sealed ball valve is characterized in that the composite metal seal II is mainly composed of a spring seat 18, a spring 19, a disc spring 20, a seal seat 21, a first composite sealing ring 22, a second composite sealing ring 23, an elliptical sealing ring 24, a first alloy layer 25, a second alloy layer 26, and a sphere 27. The spring 19 is axially arranged in the spring seat 18, and the disc spring 20 is arranged between the spring seat 18 and the seal seat 21. The first composite sealing ring 22 is mainly composed of 2 metal expansion springs of different sizes nested together. There is a certain amount of extrusion between the 2 metal expansion springs of different sizes, which can perform sealing compensation in a timely manner. The second composite sealing ring 23 is of an elliptical structure and is arranged at a certain angle with the elliptical sealing ring 24. The elliptical sealing ring 24 is arranged at a certain angle with the sealing mating surface of the sphere 27. There is a certain amount of compression in the spring 19 and the disc spring 20. When the elliptical sealing ring 24 or the second composite sealing ring 23 is worn, the spring 19 and the disc spring 20 perform compensation to keep the ball valve in good sealing. The main body of the second composite sealing ring 23 is composed of an elliptical metal sealing shell, and elastic rubber is arranged inside, with a certain amount of deformation margin, which is beneficial to the rotation of the sphere 27. The elliptical sealing ring 24 is made of a hollow elliptical expansion spring, and two arc-shaped protrusions are designed on the outer ring in contact with the sphere. The first alloy layer 25 is arranged on the inner ring of the seal seat 21, and the second alloy layer 26 is arranged on the outer ring of the sphere 27. The first alloy layer 25 and the second alloy layer 26 are arranged in a certain angular fit and are designed with a certain thickness, which is beneficial to the wear resistance function.

[0009] The rolling bearing combination structure III of the extreme high and low temperature metal sealed ball valve is mainly composed of a valve body 11, a sphere 27, a ball bearing 28, a first needle roller bearing 29, a second needle roller bearing 30, and an inner positioning sleeve 31. The ball bearing 28 and the first needle roller bearing 29 are horizontally arranged between the valve body 11 and the sphere 27, and the second needle roller bearing 30 is vertically arranged between the valve body 11 and the sphere 27. This arrangement can ensure the flexible rotation of the sphere in the horizontal and vertical directions.

[0010] The beneficial effects of the present invention are as follows: (1) A fast-switching metal-sealed ball valve applicable to extreme temperatures designed in the present invention has an applicable temperature range of -70°C to 350°C. Considering the design structure, manufacturing feasibility, and installation dimensions, this invention combines the advantages of replacing sliding friction with rolling, the load-bearing and reliability of the bearing system, composite metal seal design, and seal compensation; (2) The transmission system and the sphere seal structure of the ball valve are relatively independent. High and low temperature environments will not affect the overall working stability of the ball valve, which features stable operation and high reliability, and can effectively solve the problems of poor seal wear resistance, poor sealing performance, short service life, and high labor intensity of switching the ball valve under extreme temperatures; (3) There is a certain amount of extrusion between two metal expansion springs of different sizes, which can perform seal compensation in a timely manner. There is a certain amount of compression in the spring and the disc spring. When the elliptical seal ring or the second composite seal ring wears, the elliptical seal ring is made of a hollow elliptical expansion spring, and two arc-shaped protrusions are designed on the outer ring in contact with the sphere. The spring and the disc spring perform compensation to keep the ball valve well sealed. (4) The main body of the second composite seal ring is composed of an elliptical metal seal housing, and elastic rubber is arranged inside, with a certain amount of deformation allowance, which is conducive to the rotation of the sphere. (5) The structure of the present invention is convenient for processing, assembly, maintenance, and disassembly, has strong adaptability, and has the advantages of safety and reliability. Brief Description of the Drawings

[0011] Figure 1 is a schematic structural diagram of a metal seal for extreme high and low temperatures of the present invention.

[0012] Figure 2 is an enlarged view at I of a metal seal for extreme high and low temperatures of the present invention.

[0013] Figure 3 is an enlarged view at II of a metal seal for extreme high and low temperatures of the present invention.

[0014] Figure 4 is an enlarged view at II of a metal seal for extreme high and low temperatures of the present invention.

[0015] In the figure: 1. Motor, 2. Handwheel, 3. Transmission box, 4. Taper bearing assembly, 5. Transmission rod, 6. First bolt and nut, 7. Flange, 8. Sealing packing, 9. Valve body flange, 10. Second bolt and nut, 11. Valve body, 12. Connecting screw, 13. Bottom flange, 14. Gland, 15. Gland seal assembly, 16. Rectangular seal ring, 17. Connecting pin, 18. Spring seat, 19. Spring, 20. Disc spring, 21. Seal seat, 22. First composite seal ring, 23. Second composite seal ring, 24. Elliptical seal ring, 25. First alloy layer, 26. Second alloy layer 26, 27. Sphere, 28. Ball bearing, 29. First needle roller bearing, 30. Second needle roller bearing, 31. Inner positioning sleeve. Detailed Description of the Invention

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] An extreme high and low temperature metal sealed ball valve, overall, mainly consists of a motor 1, a handwheel 2, a transmission box 3, a tapered bearing assembly 4, a transmission rod 5, a first bolt and nut 6, a flange 7, a sealing packing 8, a valve body flange 9, a second bolt and nut 10, a valve body 11, a connecting screw 12, a bottom flange 13, a connecting flange assembly I, a composite metal seal II, and a rolling bearing combination structure III. The motor 1 is installed on the upper surface of the shell of the transmission box 3. The tapered bearing assembly 4 is sleeved on the outer shell of the transmission rod 5 and is fixedly connected to the transmission box 3 by threads. The inner ring of the bearing of the tapered bearing assembly 4 is sleeved on the outer ring of the transmission rod 5. The flange 7 and the valve body flange 9 are tightly connected by the first bolt and nut 6, and the flange 7 and the valve body flange 9 are tightly connected by the second bolt and nut 10. The tapered bearing assembly 4 is provided with two pairs of tapered bearings, and there is a bearing housing on the outside. The connecting flange assembly I consists of a valve body 11, a gland 14, a gland seal assembly 15, a rectangular sealing ring 16, and a connecting pin 17. The gland seal assembly 15 is composed of 4 pieces of V-shaped fabric packing arranged in combination and is installed in the annular groove for installing the gland seal assembly 15. The valve body 11 and the gland 14 are connected by the connecting pin 17. The rectangular sealing ring 16 is installed in the rectangular groove of the valve body 11. The V-shaped fabric packing is processed and formed from high and low temperature resistant fabric nitrile rubber. The composite metal seal II mainly consists of a spring seat 18, a spring 19, a disc spring 20, a seal seat 21, a first composite sealing ring 22, a second composite sealing ring 23, an oval sealing ring 24, a first alloy layer 25, a second alloy layer 26, and a sphere 27. The spring 19 is axially arranged in the spring seat 18, and the disc spring 20 is between the spring seat 18 and the seal seat 21. The first composite sealing ring 22 is mainly composed of 2 metal expansion springs of different sizes nested together. There is a certain amount of extrusion between the 2 metal expansion springs of different sizes, which can perform sealing compensation in a timely manner. The second composite sealing ring 23 is of an elliptical structure and is arranged at a certain angle with the oval sealing ring 24. The oval sealing ring 24 is arranged at a certain angle with the sealing mating surface of the sphere 27. The spring 19 and the disc spring 20 have a certain amount of compression. When the oval sealing ring 24 or the second composite sealing ring 23 wears, the spring 19 and the disc spring 20 perform compensation to keep the ball valve well sealed. The main body of the second composite sealing ring 23 is composed of an elliptical metal sealing shell, and elastic rubber is arranged inside, with a certain amount of deformation allowance, which is beneficial to the rotation of the sphere 27. The oval sealing ring 24 is made of a hollow oval expansion spring, and two arc-shaped protrusions are designed on the outer ring in contact with the sphere. The first alloy layer 25 is arranged on the inner ring of the seal seat 21, and the second alloy layer 26 is arranged on the outer ring of the sphere 27. The first alloy layer 25 and the second alloy layer 26 are arranged in a certain angle and are designed with a certain thickness. The rolling bearing combination structure III mainly consists of a valve body 11, a sphere 27, a ball bearing 28, a first needle roller bearing 29, a second needle roller bearing 30, and an inner positioning sleeve 31. The ball bearing 28 and the first needle roller bearing 29 are horizontally arranged between the valve body 11 and the sphere 27, and the second needle roller bearing 30 is vertically arranged between the valve body 11 and the sphere 27. This arrangement method can ensure the flexible rotation of the sphere in the horizontal and vertical directions.

[0018] When the ball valve is opened, the motor 1 is started, and the transmission box 3 and the tapered bearing assembly 4 drive the transmission rod 5 to transmit. The torque of the rotating transmission rod drives the sphere 11 to rotate. When the ball valve is closed, the motor runs in the reverse direction. If the motor 1 fails, the handwheel 2 can be rotated to switch the ball valve at the same time.

[0019] Those of ordinary skill in the art will realize that the embodiments described herein are for helping the reader understand the implementation method of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific deformations and combinations without departing from the essence of the present invention according to these technical revelations disclosed by the present invention, and these deformations and combinations are still within the protection scope of the present invention.

Claims

1. An extreme high and low temperature metal sealed ball valve, from the overall point of view, an extreme high and low temperature metal sealed ball valve, from the overall point of view, mainly composed of a motor 1, a hand wheel 2, a transmission box 3, a tapered bearing assembly 4, a transmission rod 5, a first bolt and nut 6, a flange 7, a sealing packing 8, a valve body flange 9, a second bolt and nut 10, a valve body 11, a connecting screw 12, a bottom flange 13, a connecting flange assembly I, a composite metal seal II, and a rolling bearing combination structure III.

2. The extremely high and low temperature metal sealing ball valve according to claim 1, characterized in that: The motor 1 is mounted on the upper surface of the transmission box 3 housing, the tapered bearing assembly 4 is sleeved on the transmission rod 5 housing and is threadedly fixedly connected to the transmission box 3, the inner ring of the tapered bearing assembly 4 is sleeved on the outer ring of the transmission rod 5, the flange 7 and the valve body flange 9 are fastened and connected by the first bolts and nuts 6, the flange 7 and the valve body flange 9 are fastened and connected by the second bolts and nuts 10, the tapered bearing assembly 4 is provided with two pairs of tapered bearings, and a bearing housing is provided on the outside.

3. The extreme high and low temperature metal sealing ball valve according to claim 1, characterized in that: The connecting flange assembly I is composed of a valve body 11, a gland 14, a gland sealing assembly 15, a rectangular sealing ring 16, and a connecting pin 17. The gland sealing assembly 15 is composed of a combination of 4 V-shaped cloth packings, which are installed in the annular groove of the gland sealing assembly 15. The valve body 11 and the gland 14 connecting pin 17 are connected, and the rectangular sealing ring 16 is installed in the rectangular groove of the valve body 11. The V-shaped cloth packing is formed by high and low temperature resistant cloth nitrile rubber.

4. The extreme high and low temperature metal sealing ball valve according to claim 1, characterized in that: Composite metal seal II is mainly composed of spring seat 18, spring 19, disc spring 20, sealing seat 21, first composite sealing ring 22, second composite sealing ring 23, elliptical sealing ring 24, first alloy layer 25, second alloy layer 26, and sphere 27. Spring 19 is axially arranged in spring seat 18, disc spring 20 between spring seat 18 and sealing seat 21. First composite sealing ring 22 is mainly composed of two metal expansion springs of different sizes nested. There is a certain amount of extrusion between the two metal expansion springs of different sizes, which can make sealing compensation in time. Second composite sealing ring 23 is an elliptical structure, which is set at a certain angle with elliptical sealing ring 24. Elliptical sealing ring 24 and sealing mating surface of sphere 27 are set at a certain angle. Spring 19 and disc spring 20 have a certain amount of compression. When elliptical sealing ring 24 or second composite sealing ring 23 is worn, spring 19 and disc spring 20 compensate to keep the ball valve well sealed. The main body of the second composite seal ring 23 is composed of an elliptical metal sealing shell, with elastic rubber arranged inside, and a certain deformation margin, which is conducive to the rotation of the ball 27. The elliptical seal ring 24 is made of a hollow elliptical expansion spring, and the outer ring in contact with the ball is designed with two arc-shaped protrusions. The first alloy layer 25 is arranged on the inner ring of the sealing seat 21, and the second alloy layer 26 is arranged on the outer ring of the ball 27. The first alloy layer 25 and the second alloy layer 26 are arranged at a certain angle and are designed to have a certain thickness. The main structures of the first composite seal ring 22, the second composite seal ring 23, and the elliptical seal ring 24 are metal components, which can withstand extreme temperatures ranging from -70°C to 350°C.

5. The extreme high and low temperature metal sealing ball valve according to claim 1, characterized in that: The rolling bearing combination structure III is mainly composed of a valve body 11, a sphere 27, a ball bearing 28, a first needle bearing 29, a second needle bearing 30, and an inner positioning sleeve 31. The ball bearing 28 and the first needle bearing 29 are horizontally arranged between the valve body 11 and the sphere 27, and the second needle bearing 30 is vertically arranged between the valve body 11 and the sphere 27. The arrangement can ensure flexible rotation of the sphere in the horizontal and vertical directions.

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