High-temperature-resistant and high-pressure-resistant sealing ball valve for corrugated pipe of chemical pipeline

Abstract

The invention provides a high-temperature-resistant and high-pressure-resistant chemical pipeline corrugated pipe sealing ball valve and relates to the field of valves, the high-temperature-resistant and high-pressure-resistant chemical pipeline corrugated pipe sealing ball valve comprises a valve body, a valve seat assembly, a ball body and a valve rod, an upper valve cover is arranged above the valve body, a first inlet and a first outlet are formed in the valve body in the axial direction, and a first through hole is formed in the ball body; the first inlet, the first through hole and the first outlet form a medium flow channel, a first cooling cavity is formed in the valve body corresponding to the lower end of the ball body, a second cooling cavity is formed in the valve body corresponding to the valve seat assembly, a third cooling cavity is formed in the upper valve cover in the axial direction of the valve rod, and a communicating pipeline is arranged between the second cooling cavity and the third cooling cavity. The communicating pipeline is provided with a liquid inlet connector, the communicating pipeline, the first cooling cavity, the second cooling cavity and the third cooling cavity are communicated to form a cooling flow channel, and the cooling flow channel is not communicated with the medium flow channel. The ball valve is provided with the cooling flow channel, so that the ball valve can play a self-compensation function of the corrugated pipe valve seat and can be effectively protected from being damaged, and the sealing performance of the valve rod and the upper valve cover is good.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a chemical pipeline bellows sealing ball valve resistant to high temperature and high pressure. Background Art

[0002] As a widely used fluid control device, ball valve has the characteristics of simple structure and rapid opening and closing. In order to improve the sealing performance of ball valve, setting bellows valve seat is one of the common ways. Bellows valve seat adopts flexible bellows structure. Therefore, bellows valve seat has self-compensation function. The elastic deformation ability of bellows effectively compensates the change of sealing gap caused by thermal expansion and pressure fluctuation. At the same time, it can also adapt to slight deviation or wear in valve operation, thereby ensuring the stability and reliability of valve and extending the service life of valve. In addition, this characteristic of bellows valve seat enables it to maintain good sealing performance under frequent opening and closing.

[0003] In the oil, gas, chemical, electric power and metallurgy industries, ball valves are often used in high temperature and high pressure conditions, which are characterized by temperatures usually exceeding 400°C and pressures up to tens of MPa or even higher. When ball valves are used in high temperature and high pressure conditions, the use of bellows valve seats can also play its self-compensation function. However, the bellows valve seats are prone to material creep due to long-term exposure to high temperature and high pressure, resulting in weakened elasticity of the bellows, which in turn affects its compensation ability and sealing performance. In addition, high temperature will also reduce the mechanical strength of the bellows material, making it more susceptible to damage due to pressure fluctuations or external forces.

[0004] In summary, in high temperature and high pressure environments, it is of great practical significance to design a ball valve that can fully utilize the self-compensation function of the bellows valve seat and effectively protect it from damage. Such a design can not only overcome the limitations of existing ball valves under harsh working conditions, but also significantly improve the operating reliability and safety of the equipment. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a chemical pipeline bellows sealed ball valve that is resistant to high temperature and high pressure.

[0006] The technical scheme adopted by the present invention is as follows: A high-temperature and high-pressure resistant chemical pipeline bellows sealed ball valve comprises a valve body, a valve seat assembly, a sphere and a valve stem, an upper valve cover is arranged above the valve body, one end of the valve stem is connected to the sphere and the other end extends into the upper valve cover, a first inlet and a first outlet are axially arranged in the valve body, a first through hole is arranged in the sphere, the first inlet, the first through hole and the first outlet form a medium flow channel, a first cooling cavity is arranged in the valve body corresponding to the lower end of the sphere, a second cooling cavity is arranged in the valve body corresponding to the valve seat assembly, a third cooling cavity is axially arranged in the upper valve cover along the valve stem, a connecting pipe is arranged between the second cooling cavity and the third cooling cavity, a liquid inlet joint is arranged on the connecting pipe, the connecting pipe, the first cooling cavity, the second cooling cavity and the third cooling cavity are connected to form a cooling flow channel, and the cooling flow channel is not connected to the medium flow channel.

[0007] Through the above technical solution, a cooling channel is set up to flow through the valve seat assembly and the valve stem area, which plays a role in cooling the ball valve used in high temperature and high pressure environments, reduces the stringent requirements of the ball valve on materials under high temperature conditions, and effectively prevents the valve seat assembly and valve stem from weakening strength and structural deformation under high temperature conditions; it also avoids the bellows in the valve seat assembly from weakening its elasticity due to high temperature conditions, thereby reducing the sealing effect. The cooling channel ensures that each component operates stably in a high temperature environment, maintains good performance and reliable mechanical strength, and reduces costs while ensuring stable performance.

[0008] The present invention is further configured such that the valve seat assembly includes a bellows and a first valve seat, one end of the bellows is connected to the valve body and the other end is connected to the first valve seat, and the first valve seat and the ball form a first sealing portion.

[0009] Through the above technical solution, a bellows and a first valve seat are provided, and by utilizing the self-compensation capability of the bellows, even if the ball valve is in an environment of high temperature or frequent temperature fluctuations, the bellows can flexibly expand and contract so that the first valve seat and the ball can always fit tightly together, thereby forming a reliable sealing interface and reducing the risk of sealing failure caused by temperature stress.

[0010] The present invention is further configured such that the second cooling chamber is formed between the bellows and the valve body, a packing assembly is arranged between the valve stem and the upper valve cover, the packing assembly includes a mounting ring and a first sealing ring, the first sealing ring includes a fixing portion and a sealing portion, the fixing portion is arranged in the mounting ring, the fixing portion has an arc-shaped cross-section, and is formed by extending downwardly from the sealing portion toward the valve stem, the sealing portion abuts against the valve stem to form a third sealing portion, and the third cooling chamber is connected to a side of the first sealing ring away from the valve stem.

[0011] Through the above technical solution, the coolant fills the cooling channel, and the bellows expands and contracts under the impact of the medium in a high temperature or temperature change environment, thereby squeezing the coolant and causing it to flow toward the first sealing ring. The coolant then squeezes the first sealing ring, making the seal between the first sealing ring and the valve stem more reliable. Therefore, the coolant not only plays a cooling role, but also improves the sealing performance between the upper valve cover and the valve stem.

[0012] The present invention is further configured such that a second valve seat is provided on the first valve seat and is threadedly matched with the first valve seat, and the second valve seat and the ball form a second sealing portion.

[0013] Through the above technical solution, there is a double seal between the valve seat assembly and the ball, namely the first sealing part and the second sealing part. Even if one layer of the seal fails, the other sealing surface can still play a sealing role, further reducing the risk of seal failure.

[0014] The present invention is further configured such that a mounting groove is provided on the valve body at the rear end of the first valve seat, a spring is provided in the mounting groove, one end of the spring abuts against the valve body and the other end abuts against the first valve seat.

[0015] Through the above technical solution, a spring with the same self-compensation ability is provided, and the self-compensation ability of the valve seat assembly is provided by the bellows and the spring, which can further ensure that the first valve seat fits tightly with the ball, and then ensure that the second valve seat fits tightly with the ball, forming a reliable first sealing part and a second sealing part. In addition, the position of the bellows is close to the medium flow channel, which is greatly affected by the medium in the flow channel, and there is an additional barrier (i.e., the bellows) between the spring and the medium flow channel. Therefore, the spring is less affected by the high temperature of the medium than the bellows. If the bellows is damaged or its performance is reduced due to high temperature, the self-compensation ability of the spring can still play a role without affecting the self-compensation ability of the valve seat assembly.

[0016] The present invention is further configured such that a buffer assembly is provided in both the first inlet and the first outlet, and the buffer assembly includes a mounting ring and a buffer plate, the mounting ring abuts against the valve body, a first bearing is provided between the mounting ring and the buffer plate for allowing the buffer plate to rotate relative to the mounting ring, and convex plates are provided at intervals on the inner circumference of the buffer plate.

[0017] Through the above technical solution, a buffer component is set, and when the medium passes through the medium flow channel, it will drive the buffer plate to rotate, consuming part of the impact energy of the medium, improving the tolerance of the ball valve in high-pressure conditions, and increasing its service life.

[0018] The present invention is further configured such that the convex plate and the buffer plate are staggered in the diameter direction, and the thickness of the convex plate gradually increases along the medium flow channel direction.

[0019] Through the above technical solution, the medium is converted into a vortex form when passing through the buffer component, thereby reducing the damage to the ball valve caused by the impact force of the high-pressure medium.

[0020] The present invention is further configured such that a lower valve cover is provided below the valve body, a movable groove is provided on the sphere, the lower valve cover extends into the movable groove, and a second sealing ring is provided between the lower valve cover and the valve body.

[0021] Through the above technical solution, the lower valve cover is set to position the rotation direction of the ball. At the same time, the ball valve can be inspected by removing the lower valve cover. The second sealing ring is set to prevent the medium from leaking at the lower valve cover.

[0022] The present invention is further configured such that a second bearing is sleeved on the upper end of the lower valve cover, and an outer wall of the second bearing abuts against the sphere.

[0023] Through the above technical solution, while the lower valve cover plays a role in positioning the rotation direction of the ball, it does not affect the flexible rotation of the ball to smoothly complete the opening and closing of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0025] Figure 1 For the purpose of illustrating the present invention Figure 1 ; Figure 2 For the purpose of illustrating the present invention Figure 2 ; Figure 3 For the present invention Figure 2 A magnified view of middle; Figure 4 For the present invention Figure 2 Enlarged view of middle B; Figure 5 For the present invention Figure 2 Enlarged view of middle C; Figure 6 For the present invention Figure 2 Enlarged view of middle D; Figure 7 is a schematic diagram of a buffer assembly of the present invention; Figure 8 For the present invention Figure 2 Enlarged view of E.

[0026] In the figure: 1, valve body; 101, first inlet; 102, first outlet; 2, valve seat assembly; 21, bellows; 22, first valve seat; 23, second valve seat; 24, spring; 3, sphere; 31, first through hole; 32, movable groove; 4, first cooling chamber; 5, second cooling chamber; 7, upper valve cover; 71, liquid inlet joint; 72, third cooling chamber; 73, connecting pipe; 8, valve stem; 9, buffer assembly; 91, mounting ring; 92, buffer plate; 921, convex plate; 93, first bearing; 10, lower valve cover; 11, packing assembly; 111, mounting ring; 112, first sealing ring; 1121, fixing part; 1122, sealing part; 12, second sealing ring; 13, second bearing. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0029] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0030] like Figures 1 to 8 As shown, an embodiment of the present invention is provided: A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve comprises a valve body 1, a valve seat assembly 2, a ball 3 and a valve stem 8. An upper valve cover 7 is arranged above the valve body 1. One end of the valve stem 8 is connected to the ball 3 and the other end extends into the upper valve cover 7. A first inlet 101 and a first outlet 102 are axially arranged in the valve body 1. A first through hole 31 is arranged in the ball 3. When the ball valve is opened, the first inlet 101, the first through hole 31 and the first outlet 102 form a medium flow channel. A lower valve cover 10 is arranged below the valve body 1. An active groove 32 is arranged on the ball 3. The lower valve cover 10 extends into the active groove 32. The lower valve cover 10 is arranged to position the rotation direction of the ball 3. At the same time, the ball valve can be repaired by removing the lower valve cover 10. A second sealing ring 12 is arranged between the lower valve cover 10 and the valve body 1 to prevent the medium from leaking at the lower valve cover 10. In order to enable the lower valve cover 10 to position the rotation direction of the ball 3 without affecting the flexible rotation of the ball 3 to smoothly complete the opening and closing of the ball valve, a second bearing 13 is sleeved on the upper end of the lower valve cover 10, and the outer wall of the second bearing 13 abuts against the ball 3.

[0031] The valve seat assembly 2 includes a bellows 21 and a first valve seat 22. One end of the bellows 21 is connected to the valve body 1 and the other end is connected to the first valve seat 22. The first valve seat 22 forms a first sealing portion with the ball 3. By utilizing the self-compensation capability of the bellows 21, even if the ball valve is in an environment of high temperature or frequent temperature fluctuations, the bellows 21 can flexibly expand and contract so that the first valve seat 22 and the ball 3 can always fit closely, forming a reliable sealing interface and reducing the risk of sealing failure caused by temperature stress.

[0032] In order to further reduce the risk of sealing failure of the valve seat assembly 2, a double seal is provided between the valve seat assembly 2 and the ball 3. The first valve seat 22 is provided with a second valve seat 23 threadedly matched therewith, and the second valve seat 23 and the ball 3 form a second sealing portion.

[0033] In order to further improve the self-compensation ability of the valve seat assembly 2, a mounting groove is provided on the valve body 1 at the rear end of the first valve seat 22, and a spring 24 is provided in the mounting groove, and one end of the spring 24 abuts against the valve body 1 and the other end abuts against the first valve seat 22. A spring 24 which also has a self-compensation ability is provided, and the self-compensation ability of the valve seat assembly 2 is provided by the bellows 21 and the spring 24, forming a reliable first sealing part and a second sealing part. Moreover, more importantly, the position of the bellows 21 is close to the medium flow channel, and is greatly affected by the medium in the flow channel, while the spring 24 is less affected by the high temperature of the medium than the bellows 21. If the bellows 21 is damaged or its performance is reduced due to high temperature, the self-compensation ability of the spring 24 can still play a role without affecting the self-compensation ability of the valve seat assembly 2.

[0034] In order to better apply the ball valve to high temperature conditions, the valve body 1 is provided with a first cooling chamber 4 at the lower end of the ball 3, the valve body 1 is provided with a second cooling chamber 5 at the corresponding valve seat assembly 2, the upper valve cover 7 is provided with a third cooling chamber 72 along the axial direction of the valve stem 8, a connecting pipe 73 is provided between the second cooling chamber 5 and the third cooling chamber 72, a liquid inlet joint 71 is provided on the connecting pipe 73, the connecting pipe 73, the first cooling chamber 4, the second cooling chamber 5 and the third cooling chamber 72 are connected to form a cooling channel, and the cooling channel is not connected to the medium channel. The cooling channel flows through the area where the valve seat assembly 2 and the valve stem 8 are located, which plays a role in cooling the ball valve used in a high temperature environment, reduces the stringent requirements of the ball valve on the material under high temperature conditions, and effectively prevents the valve seat assembly 2 and the valve stem 8 from weakening in strength and structural deformation under high temperature conditions; it also avoids the bellows 21 in the valve seat assembly 2 from weakening its elasticity due to high temperature conditions, thereby reducing the sealing effect.

[0035] The second cooling chamber 5 is formed between the bellows 21 and the valve body 1. A packing assembly 11 is arranged between the valve stem 8 and the upper valve cover 7. The packing assembly 11 includes a mounting ring 111 and a first sealing ring 112. The first sealing ring 112 includes a fixing portion 1121 and a sealing portion 1122. The fixing portion 1121 is arranged in the mounting ring 111. The cross-section of the fixing portion 1121 is arc-shaped and is formed by the sealing portion 1122 extending downward toward the valve stem 8. The sealing portion 1122 abuts against the valve stem 8 to form a third sealing portion. The third cooling chamber 72 is connected to the side of the first sealing ring 112 away from the valve stem 8. The coolant fills the cooling channel. The bellows 21 expands and contracts under the impact of the medium in a high temperature or temperature changing environment, which can squeeze the coolant and make it flow toward the first sealing ring 112. Then the coolant will squeeze the first sealing ring 112, making the seal between the first sealing ring 112 and the valve stem 8 more reliable. The coolant not only has a cooling effect, but also improves the sealing performance between the upper valve cover 7 and the valve stem 8.

[0036] In order to make the ball valve more suitable for high-pressure working conditions, a buffer assembly 9 is provided in both the first inlet 101 and the first outlet 102. The buffer assembly 9 includes a mounting ring 91 and a buffer plate 92. The mounting ring 91 is in contact with the valve body 1. A first bearing 93 is provided between the mounting ring 91 and the buffer plate 92 to allow the buffer plate 92 to rotate relative to the mounting ring 91. The inner circumference of the buffer plate 92 is provided with convex plates 921. The convex plates 921 are staggered with respect to the diameter direction of the buffer plate 92, and the thickness of the convex plates 921 gradually increases along the medium flow channel. When the medium passes through the medium flow channel, the buffer plate 92 is driven to rotate, which consumes part of the impact energy of the medium, and the medium is converted into a vortex form when passing through the buffer assembly 9, which reduces the damage of the impact force of the high-pressure medium to the ball valve and improves its service life.

[0037] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve, comprising a valve body (1), a valve seat assembly (2), a ball (3) and a valve stem (8), wherein an upper valve cover (7) is arranged above the valve body (1), one end of the valve stem (8) is connected to the ball (3) and the other end extends into the upper valve cover (7), a first inlet (101) and a first outlet (102) are axially arranged in the valve body (1), a first through hole (31) is arranged in the ball (3), the first inlet (101), the first through hole (31) and the first outlet (102) form a medium flow channel, and the characteristics are as follows: A first cooling chamber (4) is provided in the valve body (1) at the lower end of the corresponding ball (3), a second cooling chamber (5) is provided in the valve body (1) at the corresponding valve seat assembly (2), a third cooling chamber (72) is provided in the upper valve cover (7) along the axial direction of the valve stem (8), a connecting pipe (73) is provided between the second cooling chamber (5) and the third cooling chamber (72), a liquid inlet joint (71) is provided on the connecting pipe (73), the connecting pipe (73), the first cooling chamber (4), the second cooling chamber (5) and the third cooling chamber (72) are connected to form a cooling flow channel, and the cooling flow channel is not connected to the medium flow channel.

2. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 1, characterized in that: The valve seat assembly (2) comprises a bellows (21) and a first valve seat (22); one end of the bellows (21) is connected to the valve body (1) and the other end is connected to the first valve seat (22); the first valve seat (22) and the ball (3) form a first sealing portion.

3. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 2, characterized in that: The second cooling chamber (5) is formed between the bellows (21) and the valve body (1); a packing assembly (11) is arranged between the valve stem (8) and the upper valve cover (7); the packing assembly (11) comprises a mounting ring (111) and a first sealing ring (112); the first sealing ring (112) comprises a fixing portion (1121) and a sealing portion (1122); the fixing portion (1121) is arranged in the mounting ring (111); the fixing portion (1121) has an arc-shaped cross section and is formed by the sealing portion (1122) extending downward toward the valve stem (8); the sealing portion (1122) abuts against the valve stem (8) to form a third sealing portion; the third cooling chamber (72) is connected to a side of the first sealing ring (112) away from the valve stem (8).

4. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 2, characterized in that: The first valve seat (22) is provided with a second valve seat (23) threadedly matched therewith, and the second valve seat (23) and the ball (3) form a second sealing portion.

5. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 4, characterized in that: A mounting groove is provided on the valve body (1) at the rear end of the first valve seat (22), and a spring (24) is provided in the mounting groove. One end of the spring (24) abuts against the valve body (1) and the other end abuts against the first valve seat (22).

6. The high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 1, characterized in that: A buffer assembly (9) is provided in each of the first inlet (101) and the first outlet (102). The buffer assembly (9) comprises a mounting ring (91) and a buffer plate (92). The mounting ring (91) is in contact with the valve body (1). A first bearing (93) is provided between the mounting ring (91) and the buffer plate (92) for enabling the buffer plate (92) to rotate relative to the mounting ring (91). Convex plates (921) are provided at intervals on the inner circumference of the buffer plate (92).

7. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 6, characterized in that: The convex plate (921) and the buffer plate (92) are arranged in a staggered manner in the diameter direction, and the thickness of the convex plate (921) gradually increases along the medium flow channel direction.

8. The high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 1, characterized in that: A lower valve cover (10) is arranged below the valve body (1), a movable groove (32) is arranged on the ball body (3), the lower valve cover (10) extends into the movable groove (32), and a second sealing ring (12) is arranged between the lower valve cover (10) and the valve body (1).

9. A high temperature and high pressure resistant chemical pipeline bellows sealed ball valve according to claim 8, characterized in that: A second bearing (13) is sleeved on the upper end of the lower valve cover (10), and an outer wall of the second bearing (13) is in contact with the sphere (3).

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