A high temperature wear resistant full bore C type ceramic ball valve

Abstract

The utility model relates to a high temperature wear-resistant full-diameter C-type ceramic ball valve, which belongs to the field of valves and includes a valve body, a ball, a valve seat, a valve stem, and a transmission mechanism. The valve body is composed of a left valve body, a middle valve body, and a right valve body fixedly connected by a screw / nut. The ball body is composed of a C-type metal ball table and a ceramic ball crown. The ceramic ball crown and the ceramic valve seat form a wear-resistant sealing pair, which solves the problem that the metal sealing pair is softened at high temperature and is easily worn by the medium; the ceramic valve seat adopts an axial floating structure, so that it forms a flexible sealing pair with the ceramic ball crown to avoid the ceramic valve seat and the ceramic ball crown from hard contact and rupture. It has the advantages of high temperature resistance, wear resistance, and long service life, and is suitable for high temperature and abrasive medium working conditions such as silicon powder conveying pipelines and coal refining coal powder conveying pipelines.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to a ceramic ball valve. The utility model is suitable for high-temperature and abrasive medium working conditions. Background Art

[0002] Ball valves are widely used as control valves for medium delivery pipelines in various fields of the national economy due to their simple structure and convenient opening and closing. In high-temperature and highly abrasive medium working conditions, the ball and the valve seat generally use hard metal sealing surfaces to cooperate with each other to form a hard seal pair, so that the sealing pair has high temperature resistance and wear resistance. However, in some highly abrasive medium working conditions (such as silicon powder delivery pipelines, coal refining and coal powder delivery pipelines), the hardness of the metal material decreases due to high temperature, and the sealing surface is easily worn by the medium, resulting in a very short product life. Summary of the invention

[0003] The utility model aims at the problems existing in the prior art and provides a high temperature and wear resistant full-diameter C-type ceramic ball valve which adopts a ceramic material sealing pair and is resistant to high temperature and wear and has a long service life.

[0004] The technical solution to realize the utility model is:

[0005] A high-temperature wear-resistant full-diameter C-type ceramic ball valve comprises a valve body, a ball, a valve seat, a valve stem and a transmission mechanism. The valve body is composed of a three-piece structure consisting of a left valve body, a middle valve body and a right valve body fixedly connected by screws / nuts. The valve stem is composed of an upper valve stem and a lower valve stem. The lower end of the upper valve stem is connected to the upper shaft hole of the ball, and the upper end passes through the middle valve body to be connected to the transmission mechanism. The lower valve stem is sealed and installed in the positioning hole at the bottom of the middle valve body by a lower cover, and the upper end thereof is connected to the lower shaft hole of the ball. The ball is characterized in that: the ball is composed of a C-type metal ball table and a ceramic ball crown. A boss with an external thread is arranged at the center of the surface of the C-type metal ball table, and a screw hole matching the external thread of the boss is arranged at the center of the plane of the ceramic ball crown, so that the ceramic ball The crown is fixedly connected to the C-shaped metal ball table by threads; the valve seat adopts a ceramic valve seat, and its outer cylindrical surface is installed between the radial inner step of the ceramic sleeve and the circular concave cavity of the left valve body. The ceramic sleeve is fixedly installed on the inner cavity wall of the middle valve body. The axial width of the outer cylindrical surface of the ceramic valve seat is smaller than the length between the radial inner step of the ceramic sleeve and the bottom surface of the circular concave cavity of the left valve body, so that the ceramic valve seat can move axially between the radial inner step of the ceramic sleeve and the bottom surface of the circular concave cavity of the left valve body. A spring is arranged in the spring cavity between the left plane of the ceramic valve seat and the bottom surface of the circular concave cavity of the left valve body, and a sealing ring is arranged between the outer cylindrical surface of the ceramic valve seat and the inner hole wall of the ceramic sleeve. The inner hole of the ceramic valve seat has a spherical sealing surface that cooperates with the spherical surface of the ceramic ball crown.

[0006] In the above technical solution, the upper shaft hole of the sphere consists of a square hole and a round hole. A square shaft is arranged at the lower end of the upper valve stem and is connected to the square hole. The square shaft is axially movable with the square hole so that the sphere can float along the axis of the valve stem.

[0007] In the above technical solution, an isolation sleeve is arranged between the outer cylindrical surface of the upper valve stem and the circular hole on the upper part of the spherical upper shaft hole and the shaft hole of the ceramic sleeve. The isolation sleeve is installed in the shaft hole of the ceramic sleeve and the upper shaft hole of the sphere by a pressure ring and a stuffing box.

[0008] In the above technical solution, the inner hole of the pressure ring is provided with a radial step, and the upper valve stem is provided with a radial boss, which is pressed onto the radial step of the pressure ring by the lower end surface of the stuffing box to form a valve stem anti-blowout device.

[0009] In the above technical solution, a ceramic joint is arranged in the left valve body channel, and the ceramic joint and the ceramic valve seat have equal inner hole diameters. A sealing ring is arranged between the inner circular wall and the outer circular surface where the ceramic joint and the ceramic valve seat are interconnected, and a ceramic bushing is arranged in the channel and inner cavity wall of the right valve body.

[0010] Compared with the prior art, the utility model has the following beneficial effects: the ball body is composed of a C-shaped metal ball table and a ceramic ball crown, and the ceramic ball crown and the ceramic valve seat form a wear-resistant sealing pair, which solves the problem that the metal sealing pair softens at high temperature and is easily worn by the medium; the ceramic valve seat adopts an axial floating structure, so that it forms a flexible sealing pair with the ceramic ball crown, avoiding the ceramic valve seat and the ceramic ball crown from hard contact and cracking. It has the advantages of high temperature resistance, wear resistance, and long service life, and is suitable for high temperature and abrasive medium working conditions such as silicon powder conveying pipelines and coal refining coal powder conveying pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural sectional view of the utility model.

[0012] Figure 2 This utility model Figure 1 A magnified view of the local structure at point A.

[0013] Figure 3 This utility model Figure 1 A magnified view of the local structure at point B in the middle.

[0014] In the figure: 1 middle valve body, 2 lower valve stem, 3 ceramic sleeve, 4 C-type metal ball table, 5 ceramic ball crown, 6 ceramic valve seat, 7 gasket, 8 spring, 9 left valve body, 10 ceramic joint, 11 square shaft, 12 isolation sleeve, 13 pressure ring, 14 radial shoulder, 15 stuffing box, 16 packing, 17 packing gland, 18 bracket, 19 upper valve stem, 20 ceramic bushing, 21 right valve body, 22 boss, 23 screw hole, 24 round hole, 25 radial inner step. DETAILED DESCRIPTION

[0015] like Figure 1 The high temperature wear-resistant full-diameter C-type ceramic ball valve shown in the figure comprises a valve body, a ball, a valve seat, a valve stem and a transmission mechanism. The valve body adopts a three-piece structure composed of a left valve body 9, a middle valve body 1 and a right valve body 21 which are fixedly connected by screws / nuts. Gaskets 7 are respectively arranged between the two ends of the middle valve body 1 and the left valve body 9 and the right valve body 21 to achieve sealing between the middle valve body 1 and the left valve body 9 and the right valve body 21. The valve stem comprises an upper valve stem 19 and a lower valve stem 2. The lower end of the upper valve stem 19 is connected to the upper shaft hole of the ball, and the upper end passes through the middle valve body 1 to be connected to the transmission mechanism. The transmission mechanism is fixedly installed on the upper end of the stuffing box 15 through a bracket 18. A stuffing sealing device is arranged between the upper valve stem 19 and the middle valve body 1. The stuffing sealing device consists of a stuffing box 15, a stuffing 16 and a stuffing gland 17. The stuffing box 1 5 is sealed and fixedly installed in the installation cavity at the upper end of the middle valve body 1, the packing 16 is pressed into the packing cavity formed between the packing box 15 and the outer cylindrical surface of the upper valve stem 19 by the packing gland 17, the lower valve stem 2 is sealed and installed in the positioning hole at the bottom of the middle valve body 1 by the lower cover, and its upper end is connected with the lower shaft hole of the ball, so that the lower shaft hole of the ball can rotate on the lower valve stem 2, and the upper shaft hole of the ball is concentrically arranged with the lower shaft hole; its characteristic is that: the ball is composed of a C-shaped metal ball table 4 and a ceramic ball crown 5, a boss 22 with an external thread is arranged at the center of the table surface of the C-shaped metal ball table 4, a screw hole 23 that cooperates with the external thread of the boss 22 is arranged at the center of the plane of the ceramic ball crown 5, and the ceramic ball crown 5 is fixedly connected with the C-shaped metal ball table 4 through a thread to prevent the ceramic ball crown 5 from being separated from the C-shaped metal ball table 4, such as Figure 3 As shown, the C-shaped metal ball table 4 is connected to the upper valve stem 19 to withstand the opening and closing torque. The ceramic ball crown 5 and the valve seat form a sealing pair, so that the ball can withstand high torque capacity and have high wear resistance. The valve seat adopts a ceramic valve seat 6, and its outer cylindrical surface is installed between the radial inner step 25 of the ceramic sleeve 3 and the circular concave cavity of the left valve body 9. The ceramic sleeve 3 is fixedly installed on the inner cavity wall of the middle valve body 1. The axial width of the outer cylindrical surface of the ceramic valve seat 6 is less than the length between the radial inner step 25 of the ceramic sleeve 3 and the bottom surface of the circular concave cavity of the left valve body 9, so that the ceramic valve seat 6 can It moves axially between the radial inner step 25 of the ceramic sleeve 3 and the bottom surface of the circular concave cavity of the left valve body 9. The axial direction referred to here refers to the direction of the center line of the valve body channel. A spring 8 is arranged in the spring cavity between the left plane of the ceramic valve seat 6 and the bottom surface of the circular concave cavity of the left valve body 9, so that the ceramic valve seat 6 and the ceramic ball crown 5 form a flexible sealing pair to avoid hard contact and rupture between the two. A sealing ring is arranged between the outer cylindrical surface of the ceramic valve seat 6 and the inner hole wall of the ceramic sleeve 3, and a spherical sealing surface that cooperates with the spherical surface of the ceramic ball crown 5 is provided at the right end of the flow channel hole of the ceramic valve seat 6.

[0016] The upper shaft hole of the ball is composed of a square hole and a round hole 24. The lower end of the upper valve stem 19 is provided with a square shaft 11 which is connected to the square hole in cooperation with each other. The square shaft 11 is axially movable with the square hole, that is, the square shaft 11 is movably inserted in the square hole, so that the ball can float along the axis direction of the valve stem. Figure 2 As shown, during the closing rotation of the ball, the ball floats along the axial direction of the valve stem to automatically adjust the concentricity between the sealing surface of the ceramic ball crown 5 and the sealing surface of the ceramic valve seat 6, thereby improving the sealing performance.

[0017] An isolation sleeve 12 is arranged between the outer cylindrical surface of the upper valve stem 19, the circular hole 24 on the sphere and the axial hole of the ceramic sleeve 3. The isolation sleeve 12 is installed in the axial hole of the ceramic sleeve 3 and the upper axial hole of the sphere by means of a pressure ring 13 and a stuffing box 15 to prevent the upper valve stem 19 from being directly eroded and corroded by the medium. Figure 2 shown.

[0018] The inner hole of the pressure ring 13 is provided with a radial step, and the upper valve stem 19 is provided with a radial boss 14. The radial boss 14 is press-fitted on the radial step of the pressure ring 13 by the lower end surface of the stuffing box 15, forming an anti-blow-out device for the upper valve stem 19.

[0019] A ceramic joint 10 is arranged in the channel of the left valve body 9. The ceramic joint 10 and the ceramic valve seat 6 have the same inner hole diameter to form a full-diameter structure. A sealing ring is arranged between the inner circular wall and the outer circular surface of the ceramic joint 10 and the ceramic valve seat 6 to achieve a sealed connection between the two. A ceramic bushing 20 is arranged in the channel and the inner cavity wall of the right valve body 21. A sealing ring is arranged between the ceramic bushing 20 and the ceramic sleeve 3 to achieve a sealed connection between the two, completely isolating the valve body flow channel from the medium, preventing the medium from scouring and corroding the valve body, and improving the service life of the product.

[0020] The C-shaped metal ball table 4 and the upper valve stem 19 can also be connected by an axial keyway and an axial key. That is, an axial key is arranged on the outer cylindrical surface of the upper valve stem 19 and is connected to the axial keyway arranged in the upper axial hole of the C-shaped metal ball table 4, so that the C-shaped metal ball table 4 can float in the axial direction of the upper valve stem 19.

Claims

1. A high temperature wear resistant full-diameter C-type ceramic ball valve, comprising a valve body, a ball, a valve seat, a valve stem, and a transmission mechanism. The valve body is a three-piece structure consisting of a left valve body (9), a middle valve body (1), and a right valve body (21) fixedly connected by a screw / nut. The valve stem comprises an upper valve stem (19) and a lower valve stem (2). The lower end of the upper valve stem (19) is connected to the upper shaft hole of the ball, and the upper end passes through the middle valve body (1) and is connected to the transmission mechanism. The lower valve stem (2) is sealed by a lower cover and installed in a positioning hole at the bottom of the middle valve body (1). The upper end of the lower valve stem (2) is connected to the lower shaft hole of the ball. The lower valve stem (2) is characterized in that: The sphere is composed of a C-shaped metal ball table (4) and a ceramic ball crown (5). A boss (22) with an external thread is arranged at the center of the table surface of the C-shaped metal ball table (4). A screw hole (23) is arranged at the center of the plane of the ceramic ball crown (5). The ceramic ball crown (5) is fixedly connected to the C-shaped metal ball table (4) through a thread. The valve seat is a ceramic valve seat (6), the outer cylindrical surface of which is installed between the radial inner step (25) of the ceramic sleeve (3) and the circular concave cavity of the left valve body (9). The ceramic sleeve (3) is fixedly installed on the inner cavity wall of the middle valve body (1). The axial width of the outer cylindrical surface of the ceramic valve seat (6) is less than the radial inner step (25) of the ceramic sleeve (3). The length between the inward step (25) and the bottom surface of the circular concave cavity of the left valve body (9) is such that the ceramic valve seat (6) can move axially between the radially inward step (25) and the bottom surface of the circular concave cavity of the left valve body (9). A spring (8) is arranged in a spring cavity between the left plane of the ceramic valve seat (6) and the bottom surface of the circular concave cavity of the left valve body (9), so that the ceramic valve seat (6) and the ceramic ball crown (5) form a flexible sealing pair. A sealing ring is arranged between the outer cylindrical surface of the ceramic valve seat (6) and the inner hole wall of the ceramic sleeve (3). A spherical sealing surface that cooperates with the spherical surface of the ceramic ball crown (5) is arranged at the right end of the flow channel hole of the ceramic valve seat (6).

2. The high temperature wear-resistant full-diameter C-type ceramic ball valve according to claim 1 is characterized by: The upper axial hole of the sphere is composed of a square hole and a round hole (24). A square shaft (11) is provided at the lower end of the upper valve stem (19) and is connected to the square hole. The square shaft (11) is axially movable with the square hole so that the sphere can float along the axial direction of the valve stem. During the closing and rotating process of the sphere, the concentricity between the sealing surface of the ceramic ball crown (5) and the sealing surface of the ceramic valve seat (6) is automatically adjusted.

3. The high temperature wear-resistant full-diameter C-type ceramic ball valve according to claim 2 is characterized by: An isolating sleeve (12) is arranged between the outer cylindrical surface of the upper valve stem (19), the circular hole (24) on the sphere, and the axial hole of the ceramic sleeve (3). The isolating sleeve (12) is installed in the axial hole of the ceramic sleeve (3) and the upper axial hole of the sphere by means of a pressure ring (13) and a stuffing box (15).

4. The high temperature wear-resistant full-diameter C-type ceramic ball valve according to claim 3 is characterized by: The inner hole of the pressure ring (13) is provided with a radial step, and the upper valve stem (19) is provided with a radial boss (14). The radial boss (14) is press-fitted onto the radial step of the pressure ring (13) by the lower end surface of the stuffing box (15), thereby forming an anti-blowout device for the upper valve stem (19).

5. The high temperature wear resistant full bore C-type ceramic ball valve according to claim 1, 2, 3 or 4, characterized in that: A ceramic joint (10) is arranged in the channel of the left valve body (9), the ceramic joint (10) and the ceramic valve seat (6) having the same inner hole diameter, a sealing ring is arranged between the inner circular wall and the outer circular surface of the ceramic joint (10) and the ceramic valve seat (6) connected to each other, and a ceramic bushing (20) is arranged in the channel and the inner cavity wall of the right valve body (21).

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