A wear-resistant ball valve applicable to the slag powder state working condition

Abstract

The present invention relates to the technical field of the structure of wear-resistant ball valves for slag powder working conditions, and particularly relates to a wear-resistant ball valve suitable for slag powder working conditions, which includes a valve seat, a valve cover, a valve stem and a ball. The upper opening of the valve seat is covered with the valve cover. The valve stem penetrates through the valve cover to drive the ball located in the inner cavity of the valve seat to rotate. An inner liner is arranged in the valve seat, and the inner liner communicates with the flow channel on the valve seat. The ball is rotationally installed in the inner liner through the valve stem. By using an active sealing device, after the ball rotates to cut off the flow channel, the sealing ring actively moves towards the ball, and the sealing ring is squeezed and abutted against the ball to complete the sealing arrangement of the ball. Even if slag powder enters between the ball and the sealing ring, through the strong extrusion of the sealing ring, the sealing ring can be completely sealed with the ball, solving the problem that the slag powder is located between the sealing ring and the ball, resulting in poor sealing of the ball.

Description

Technical Field

[0001] The present invention relates to the technical field of wear-resistant ball valve structures dedicated to slag powder working conditions, and particularly relates to a wear-resistant ball valve suitable for slag powder state working conditions. Background Art

[0002] In China, ball valves are widely used in industries such as petroleum refining, long-distance pipelines, chemical industry, papermaking, pharmaceuticals, water conservancy, electric power, municipal administration, and steel, playing a crucial role in the national economy. It has an operation of rotating 90 degrees, the plug body is a sphere, and there is a circular through-hole or passage passing through its axis.

[0003] Ball valves are mainly used in pipelines for cutting, distributing, and changing the flow direction of the medium. It only requires a 90-degree rotation operation and a very small torque to close tightly. Ball valves are most suitable for use as on-off valves and cut-off valves, such as V-type ball valves.

[0004] Especially, due to its own compact structure, reliable sealing, short stroke and other characteristics, ball valves are generally applicable to working conditions of powdery materials and granular material media with low sealing requirements in industries such as coal and mines; the main disadvantage of spherical discharge valves is that powdery and granular media easily enter between the valve seat sealing surface and the sphere sealing surface, and coking media easily adhere to the valve seat and sphere sealing surfaces, causing great wear to the sealing surfaces, poor sealing performance, and short product service life.

[0005] In the Chinese patent with the patent application number 202110132868.7, it specifically discloses an automatic defouling multi-level sealed discharge ball valve with double scrapers, including a valve body, a valve seat, a sphere, a valve stem, and a transmission mechanism. The valve seat consists of a combined valve seat composed of three independently floating inner valve seats, middle valve seats, and outer valve seats. The wear compensation of the three valve seats does not interfere with each other, and any one of them can be independently and automatically compensated after wear, so that the combined valve seat and the sphere form three independent and non-interfering sealing pairs, improving the sealing reliability; an inner scraper composed of several small scrapers is arranged inside the inner valve seat sealing ring, and an outer scraper composed of several small scrapers is arranged outside the outer valve seat sealing ring. When the sphere rotates, the coking substances on the surface are reliably removed, preventing the coking substances from accumulating and squeezing between the scraper and the sphere surface to cause wear to the sphere surface.

[0006] However, according to the applicant's reaction, the above technical solution still has the following technical problems:

[0007] Although the scraper is set to scrape the coking substances on the sphere to ensure the contact sealing between the sealing ring and the sphere, only through the floating compensation of the floating valve seat, the contact sealing between the sealing ring and the sphere is achieved, which will cause slag powder to be located between the sealing ring and the sphere, resulting in the problem of poor sealing. Summary of the Invention

[0008] In view of the above problems, the present invention provides a wear-resistant ball valve applicable to slag powder state working conditions. By using an active sealing device, after the ball rotates to cut off the flow channel, the sealing ring moves actively towards the ball, and the sealing ring is extruded and abutted against the ball to complete the sealing arrangement of the ball. Even if slag powder enters between the ball and the sealing ring, through the strong extrusion of the sealing ring, the sealing ring can be completely sealed with the ball, solving the problem that the slag powder is located between the sealing ring and the ball, resulting in poor sealing of the ball.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A wear-resistant ball valve applicable to slag powder state working conditions, including a valve seat, a valve cover, a valve stem and a ball. The upper opening of the valve seat is covered with the valve cover. The valve stem penetrates the valve cover and drives the ball located in the inner cavity of the valve seat to rotate. An inner liner is arranged in the valve seat, and the inner liner communicates with the flow channel on the valve seat. The ball is rotatably installed in the inner liner through the valve stem;

[0011] An active sealing device is arranged at one end of the inner liner close to the discharge port of the flow channel. When the ball closes the flow channel, the active sealing device pushes and extrudes the sealing ring elastically arranged thereon towards the ball, so that the sealing ring abuts against the ball to form a seal;

[0012] Before the ball opens the flow channel, the active sealing device moves the sealing ring thereon away from the ball, and then the ball rotates to completely open the flow channel.

[0013] As an improvement, the inner liner includes a liner body and a sealing plate. The liner body is provided with openings on both sides and is respectively communicated with the flow channels on the valve seat, and the communication parts are all sealed. The top of the liner body is provided with an opening for the ball to be placed;

[0014] After the ball is placed in the liner body, the sealing plate seals the top opening of the liner body to keep the inside of the inner liner sealed.

[0015] As an improvement, reinforcing ribs for enhancing the strength of the liner body are arranged outside the liner body.

[0016] As an improvement, the inner liner is installed and connected to the valve seat and the valve cover through a connecting flange, so that the inner liner is suspended in the valve seat.

[0017] As an improvement, the inner liner and the connecting flange are connected by threaded connectors, and sealing gaskets are arranged at the positions where the threaded connectors are arranged.

[0018] As an improvement, the active sealing device includes a sealing seat, a nut and a transmission connection group;

[0019] The sealing seat is concentrically sleeved with the flow channel, an outer wall of the sealing seat is provided with an external thread, and the sealing ring is embedded in the end of the sealing seat facing the sphere;

[0020] The nut is sleeved on the sealing seat, and an inner ring of the nut is provided with an internal thread corresponding to the external thread. The nut is limited by the inner liner to maintain a vertical setting, and a bearing is provided at the contacting position;

[0021] The nut is transmission-connected to the valve stem via a transmission connection group, and the valve stem drives the nut to rotate, so that the sealing seat moves along the axial direction of the flow channel.

[0022] As an improvement, the transmission connection group includes a driving gear and a driven gear;

[0023] The driving gear is sleeved on the valve stem and driven to rotate by the valve stem;

[0024] The driven gear is sleeved on the nut, and the driven gear is meshed with the driving gear.

[0025] As an improvement, the active sealing device further comprises a rigidly arranged blocking ring, the blocking ring is sleeved and mounted on the sealing seat, and an elastic adjusting member is arranged between the blocking ring and the sealing seat, and the sealing ring is located inside the blocking ring;

[0026] Before the sealing ring contacts and seals with the ball, the blocking ring contacts and seals with the ball before the sealing ring.

[0027] As an improvement, the valve stem comprises an inner valve stem and an outer valve stem, the inner valve stem is connected to the ball, and the driving gear is sleeved on the outer valve stem.

[0028] As an improvement, the tops of the inner valve stem and the outer valve stem are respectively sleeved with operating hand wheels.

[0029] The beneficial effects of the present invention are:

[0030] (1) The present invention utilizes an active sealing device so that after the ball rotates to cut off the flow channel, the sealing ring actively moves toward the ball, so that the sealing ring is pressed against the ball to complete the sealing setting of the ball. Even if slag powder enters between the ball and the sealing ring, the sealing ring can be strongly squeezed to completely seal the sealing ring with the ball.

[0031] (2) In the present invention, a blocking ring is arranged outside the sealing ring. The blocking ring is in contact and cooperation with the sphere prior to the sealing ring, and the end of the blocking ring in contact with the sphere is provided with a tip similar to a blade shape. By the contact between the blocking ring and the sphere, the sphere is scratched and preliminarily sealed, so that the residue of slag powder on the part of the sphere in contact with the sealing ring is reduced as much as possible, and the sealing performance of the sealing ring is improved.

[0032] (3) In the present invention, by arranging the valve stem inside and outside, the valve stem can control the rotation of the sphere separately and also control the movement of the sealing ring, making the structure more compact. Moreover, during operation, the operation sequence is smoother and there will be no errors.

[0033] (4) Innovatively, in the present invention, an inner liner is arranged in the valve seat to isolate between the sphere and the valve seat, so that the active movement of the sealing ring is supported and there will be no leakage. When the present invention is applied to the slag powder working condition, the sealing performance can be better improved.

[0034] In summary, the present invention has the advantages of stable sealing, stable structure, good pressure relief effect, etc., and is particularly suitable for the technical field of wear-resistant ball valve structures dedicated to slag powder working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic partial cross-sectional structure diagram of the present invention;

[0036] Figure 2 is a schematic three-dimensional structure diagram of the present invention;

[0037] Figure 3 is a schematic three-dimensional structure diagram of the inner liner of the present invention;

[0038] Figure 4 is a schematic cross-sectional structure diagram of the inner liner of the present invention;

[0039] Figure 5 is a schematic three-dimensional structure diagram of the active sealing device of the present invention Figure 1 ;

[0040] Figure 6 is a schematic three-dimensional structure diagram of the active sealing device of the present invention Figure 2 ;

[0041] Figure 7 is a schematic three-dimensional structure diagram of the active sealing device of the present invention Figure 3 ;

[0042] Figure 8 is a schematic three-dimensional structure diagram of the sealing seat of the present invention;

[0043] Figure 9 is a schematic three-dimensional structure diagram of the nut of the present invention;

[0044] Figure 10 Schematic cross-sectional view of the valve seat of the present invention;

[0045] Figure 11 Schematic cross-sectional view of the active sealing device of the present invention;

[0046] Figure 12 Schematic view of the second embodiment of the present invention;

[0047] Figure 13 Schematic view of the third embodiment of the present invention. Detailed implementation manners

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. 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 protection scope of the present invention.

[0049] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0050] Embodiment 1:

[0051] As Figures 1 to 11As shown in the figure, a wear-resistant ball valve applicable to the slag powder state working condition includes a valve seat 1, a valve cover 2, a valve stem 3 and a ball 4. The upper opening of the valve seat 1 is covered with the valve cover 2 to form a sealed chamber. Only the two ends of the flow channel 11 on the valve seat 1 are communicated. The valve stem 3 penetrates the valve cover 2 to drive the ball 4 located in the inner cavity of the valve seat 1 to rotate. An inner liner 5 is arranged in the valve seat 1. The inner liner 5 is communicated with the flow channel 11 on the valve seat 1, and the positions where the inner liner 5 is communicated with the valve seat 1 are all sealed to ensure the tightness inside the inner liner 5 and prevent the leakage of slag powder medium. And the ball 4 is rotatably installed in the inner liner 5 through the valve stem 3;

[0052] An active sealing device 6 is arranged at one end of the inner liner 5 close to the discharge port 111 of the flow channel 11. When the ball 4 closes the flow channel 11, the active sealing device 6 actively pushes and presses the sealing ring 61 elastically arranged thereon towards the ball 4, so that the sealing ring 61 abuts against the ball to form a seal, and the ball valve is completely closed;

[0053] Before the ball 4 opens the flow channel 11, the active sealing device 6 moves the sealing ring 61 thereon away from the ball 4, and then the ball 4 rotates to completely open the flow channel 11, and the ball valve is completely opened.

[0054] Specifically, the inner liner 5 includes a liner body 51 and a sealing plate 52. The two sides of the liner body 51 are provided with openings and are respectively communicated with the flow channel 11 on the valve seat 1, and the communicating parts are all sealed to prevent the leakage of slag powder medium. The top of the liner body 51 is provided with an opening for the ball 4 to be placed therein;

[0055] And after the ball 4 is placed in the liner body 51, the sealing plate 52 seals the top opening of the liner body 51 to maintain the internal seal of the inner liner 5.

[0056] In order to improve the strength of the inner liner, a reinforcing rib 511 for enhancing the strength of the liner body 51 is arranged outside the liner body 51.

[0057] Furthermore, the inner liner 5 is installed and connected with the valve seat 1 and the valve cover 2 through a connecting flange 7, so that the inner liner 5 is suspended in the valve seat 1. The inner liner 5 and the connecting flange 7 are connected by threaded connectors, and sealing gaskets are arranged at the positions where the threaded connectors are provided.

[0058] In addition, the active sealing device 6 includes a sealing seat 62, a nut 63 and a transmission connection group 64;

[0059] The sealing seat 62 is concentrically sleeved with the flow channel 11, and an external thread 621 is provided on the outer wall of the sealing seat 62. The sealing ring 61 is embedded in the end of the sealing seat 62 facing the ball 4. The sealing ring 61 is made of high temperature resistant and wear-resistant material.

[0060] The nut 63 is sleeved on the sealing seat 62, and the inner ring of the nut 63 is provided with an internal thread 631 corresponding to the external thread 621. The nut 63 is limited by the inner liner 5 to maintain a vertical setting, and a bearing is provided at the contacting position. Since the nut 63 is sleeved on the sealing seat 62, and the sealing seat 62 is cylindrical and penetrated in the flow channel 11, the nut 63 can rotate while maintaining a vertical setting. In order to enable the nut 63 and the sealing seat 62 to cooperate with the internal and external threads to achieve the purpose of moving the sealing seat 62 forward and backward, the circumferential direction of the sealing seat 62 is limited by the setting of the positioning block 620 and the engagement with the slide groove 111 on the inner wall of the flow channel 11, so that the circumferential degree of freedom of the sealing seat 62 is limited;

[0061] The nut 63 is transmission-connected to the valve stem 3 via a transmission connection group 64 , and the valve stem 3 drives the nut 63 to rotate, so that the sealing seat 62 moves along the axial direction of the flow channel 11 .

[0062] Specifically, the transmission connection group 64 includes a driving gear 641 and a driven gear 642;

[0063] The driving gear 641 is sleeved on the valve stem 3 and is driven to rotate by the valve stem 3;

[0064] The driven gear 642 is sleeved on the nut 63 and meshed with the driving gear 641 , wherein the driving gear 641 is a sector gear having only a part of teeth for driving the driven gear 642 to rotate, so that the sealing seat 62 moves forward and backward.

[0065] In the specific working process, after the ball 4 rotates 90° to cut off the flow channel 11, the driving gear 641 rotates and cooperates with the driven gear 642 to drive the nut 63 to rotate, and the sealing seat 62 moves toward the ball 4 through the cooperation of the internal thread 631 and the external thread 621, until the sealing ring 61 embedded on the sealing seat 62 completes the extrusion and contact with the ball 4 to form a seal, thereby achieving the effect of sealing the ball valve;

[0066] When the ball valve is opened, the sealing seat 62 is firstly moved away from the ball 4 through reverse operation, so that the sealing ring 61 eliminates the interference with the ball 4, and then the ball 4 is rotated so that the channel on the ball 4 is coaxially arranged with the flow channel 11, thereby completing the opening of the ball valve.

[0067] Embodiment 2:

[0068] Figure 12 This is a schematic structural diagram of the second embodiment of a wear-resistant ball valve applicable to slag powder state working conditions according to the present invention; as Figure 12 shown, where the same or corresponding components as those in Embodiment 1 are labeled with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. This Embodiment 2 is different from Figure 1 the Embodiment 1 shown in

[0069] As Figure 12 shown, the active sealing device 6 further includes a rigidly arranged blocking ring 65, which is sleeved and installed on the sealing seat 62, and an elastic adjusting member 66 is arranged between the blocking ring 65 and the sealing seat 62, and the sealing ring 61 is located inside the blocking ring 65;

[0070] Before the sealing ring 61 comes into contact and cooperates with the sphere 4 for sealing, the blocking ring 65 comes into contact and seals with the sphere 4 prior to the sealing ring 61.

[0071] It should be noted that since the ball valve of the present application is used for the on-off control of the conveying pipeline of slag powder state medium, it is inevitable that coking substances or slag powder state medium will adhere to the sphere 4, especially at the part where the sealing ring 61 is pressed against the sphere 4. Therefore, in order to minimize the presence of the medium as much as possible, the present application is provided with a blocking ring 65, which uses the blocking ring 65 to contact the sphere 4 prior to the sealing ring 61 to form the first seal. And since the sealing ring 61 is located at the outlet end of the flow channel 11, after the blocking ring 65 contacts the sphere 4 to complete the first seal, the slag powder state medium is directly output from the outlet end of the flow channel 11, which ensures that there is as little medium on the sphere 4 as possible. At the same time, the blocking ring 65 is preferably in the shape of a scraper. When the blocking ring 65 contacts the sphere, it just scrapes the sphere 4 once, further reducing the coking substances and slag powder state medium, and further ensuring the sealing performance of the ball valve.

[0072] Embodiment 3:

[0073] Figure 13 This is a schematic structural diagram of the third embodiment of a wear-resistant ball valve applicable to slag powder state working conditions according to the present invention; as Figure 13 shown, where the same or corresponding components as those in Embodiment 1 are labeled with the corresponding reference numerals in Embodiment 1. For the sake of simplicity, only the differences from Embodiment 1 will be described below. This Embodiment 3 is different from Figure 1 the Embodiment 1 shown in

[0074] As Figure 13As shown, the valve stem 3 includes an inner valve stem 31 and an outer valve stem 32. The inner valve stem 31 is connected to the sphere 4, and the driving gear 641 is sleeved on the outer valve stem 32.

[0075] Further, operating handwheels 33 are respectively sleeved on the tops of the inner valve stem 31 and the outer valve stem 32.

[0076] It should be noted that by using the coaxial sleeve arrangement of the inner and outer parts of the valve stem 3, the inner valve stem 31 is used to drive the sphere 4 to rotate, while the driving gear 641 is driven by the outer valve stem 32. Moreover, by setting different operating handwheels 33 for rotational control, the control of the sphere and the sealing ring can be effectively distinguished, while simplifying the operating structure and achieving the compactness of the overall structure of the ball valve.

[0077] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wear-resistant ball valve applicable to the slag powder state working condition, comprising a valve seat (1), a valve cover (2), a valve stem (3) and a ball (4). The upper opening of the valve seat (1) is covered with the valve cover (2). The valve stem (3) penetrates through the valve cover (2) to drive the ball (4) located in the inner cavity of the valve seat (1) to rotate. It is characterized in that: An inner liner (5) is arranged in the valve seat (1). The inner liner (5) communicates with the flow channel (11) on the valve seat (1). The ball (4) is rotatably installed in the inner liner (5) through the valve stem (3); One end of the inner liner (5) close to the discharge port (111) of the flow channel (11) is provided with an active sealing device (6). When the ball (4) closes the flow channel (11), the active sealing device (6) pushes and presses the sealing ring (61) elastically arranged thereon towards the ball (4), so that the sealing ring (61) abuts against the ball to form a seal; Before the ball (4) opens the flow channel (11), the active sealing device (6) moves the sealing ring (61) thereon away from the ball (4), and then the ball (4) rotates to completely open the flow channel (11); The active sealing device (6) includes a sealing seat (62), a nut (63) and a transmission connection group (64); The sealing seat (62) is concentrically sleeved with the flow channel (11). An external thread (621) is arranged on the outer side wall of the sealing seat (62), and the sealing ring (61) is embedded at the end of the sealing seat (62) facing the ball (4). The circumferential direction of the sealing seat (62) is limited and is only arranged to move along its axial direction; The nut (63) is sleeved on the sealing seat (62). An internal thread (631) corresponding to and cooperating with the external thread (621) is arranged on the inner ring of the nut (63). The nut (63) is limited by the inner liner (5) to keep it vertically arranged, and a bearing is arranged at the contact part; The nut (63) is in transmission connection with the valve stem (3) through the transmission connection group (64). The valve stem (3) drives the nut (63) to rotate, so that the sealing seat (62) moves along the axis direction of the flow channel (11); The transmission connection group (64) includes a driving gear (641) and a driven gear (642); The driving gear (641) is sleeved on the valve stem (3) and is driven to rotate by the valve stem (3); The driven gear (642) is sleeved on the nut (63), and the driven gear (642) is meshed with the driving gear (641); The active sealing device (6) further includes a rigidly arranged blocking ring (65). The blocking ring (65) is sleeved on the sealing seat (62), and an elastic adjusting member (66) is arranged between the blocking ring (65) and the sealing seat (62). The sealing ring (61) is located within the blocking ring (65); Before the sealing ring (61) is in contact and sealed with the sphere (4), the blocking ring (65) is in contact and sealed with the sphere (4) prior to the sealing ring (61).

2. A wear-resistant ball valve applicable to slag powder state working conditions according to claim 1, characterized in that: the inner liner (5) includes a liner body (51) and a sealing plate (52), both sides of the liner body (51) are provided with openings and are respectively communicated with the flow channels (11) on the valve seat (1), and the communicating parts are all sealed, the top of the liner body (51) is provided with an opening for the sphere (4) to be placed therein; after the sphere (4) is placed in the liner body (51), the sealing plate (52) seals the top opening of the liner body (51) to maintain the internal seal of the inner liner (5).

3. A wear-resistant ball valve applicable to slag powder state working conditions according to claim 2, characterized in that: reinforcing ribs (511) for enhancing the strength of the liner body (51) are arranged outside the liner body (51).

4. A wear-resistant ball valve applicable to slag powder state working conditions according to any one of claims 1-2, characterized in that: the inner liner (5) is installed and connected to the valve seat (1) and the valve cover (2) through a connecting flange (7), so that the inner liner (5) is suspended in the valve seat (1).

5. A wear-resistant ball valve applicable to slag powder state working conditions according to claim 4, characterized in that: the inner liner (5) and the connecting flange (7) are connected by threaded connectors, and sealing gaskets are arranged at the positions where the threaded connectors are provided.

6. A wear-resistant ball valve applicable to slag powder state working conditions according to claim 1, characterized in that: the valve stem (3) includes an inner valve stem (31) and an outer valve stem (32), the inner valve stem (31) is connected to the sphere (4), and a driving gear (641) is sleeved on the outer valve stem (32).

7. A wear-resistant ball valve applicable to slag powder state working conditions according to claim 6, characterized in that: operating handwheels (33) are respectively sleeved on the tops of the inner valve stem (31) and the outer valve stem (32).

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