Large-caliber ball valve wax mold structure with internal middle coaxial type horizontal flow dividing runner

Abstract

The utility model belongs to the field of ball valve casting, and provides a large-diameter ball valve wax mold structure with an internal middle coaxial horizontal flow dividing runner, which comprises a spherical shell part, a central column, a sprue part and a riser part. A front flange part and a rear flange part which are coaxial are formed at the two opposite ends of the spherical shell part. The center column penetrates through the spherical shell part in the center axis direction of the front flange part and the rear flange part, the front flange part is connected to the center column through the flow dividing part, the rear flange part is connected to the center column through the main connecting strip, and the main connecting strip and the flow dividing part are symmetrical about the center column. The sprue part is connected to the end, close to the main connecting strip, of the center column and extends in the direction parallel to the center column. The riser part is connected to the main connecting strip and spaced from the sprue part, and the extension direction of the riser part is parallel to the extension direction of the sprue part.

Description

Technical Field

[0001] The present application belongs to the field of ball valve casting, and more specifically, relates to a large-diameter ball valve wax mold structure with an inner centrally placed coaxial horizontal diversion flow channel. Background Art

[0002] The wax mold structure is a key link in the ball valve manufacturing process, and its quality directly affects the accuracy and performance of the final product. By controlling the size, shape and internal structure of the wax mold, the ball valve can obtain good material distribution and mechanical properties during the casting process, thereby improving the reliability and service life of the product. For large-diameter ball valves, the design and manufacture of their wax mold structure is particularly important. However, due to the unreasonable design of the existing large-diameter ball valve wax mold structure, shrinkage holes, shrinkage and other defects are often prone to occur during the casting process. These defects not only affect the density and strength of the ball valve, but may also cause medium leakage and affect the sealing performance of the ball valve. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a wax mold structure of a large-diameter ball valve with an inner centrally placed coaxial horizontal diversion channel to solve the technical problem of poor casting quality of large-diameter ball valves in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the present application is to provide a large-diameter ball valve wax mold structure with an inner centrally placed coaxial horizontal diversion flow channel, comprising:

[0005] The spherical shell portion has a coaxial front flange portion and a rear flange portion formed at opposite ends;

[0006] A central column, passing through the spherical shell portion along the central axis direction of the front flange portion and the rear flange portion, the front flange portion is connected to the central column via a diverter portion, the rear flange portion is connected to the central column via a main connecting strip, and the main connecting strip and the diverter portion are symmetrical about the central column;

[0007] A gate portion, connected to the end of the center column close to the main connecting strip and extending in a direction parallel to the center column;

[0008] A riser portion is connected to the main connecting bar and spaced apart from the gate portion, wherein an extending direction of the riser portion is parallel to an extending direction of the gate portion.

[0009] Optionally, a thickness of the diverter portion in a radial direction of the central column is the same as a diameter of the central column.

[0010] Optionally, a valve seat for mounting a valve core and adjacent to the front flange portion is formed in the spherical shell portion;

[0011] The diversion portion forms a first end face and a second end face opposite to each other along the axial direction of the center column, the first end face extends to the adjoining position of the valve seat and the front flange portion, the second end face extends to the end face of the front flange portion away from the valve seat, and both the first end face and the second end face are inclined relative to the center column.

[0012] Optionally, the diversion portion forms a buffer plane connected to the second end surface and perpendicular to the central column, the center of the buffer plane is coaxially arranged with the central column and the buffer plane is symmetrical about the central column.

[0013] Optionally, the first end faces located on opposite sides of the central column form an angle of 90°.

[0014] Optionally, a through hole for the central column to pass through is provided on the front flange portion, and a diameter d of the central column is one third of a hole diameter D of the through hole.

[0015] Optionally, the spherical shell portion is provided with a first boss and a second boss opposite to each other in a direction parallel to the main connecting bar, the first boss and the second boss are provided with corresponding through holes, and the outer diameter of the first boss is greater than the outer diameter of the second boss;

[0016] A reinforcing rib is arranged between one side of the central column which is biased towards the first boss and the main connecting bar.

[0017] Optionally, a feeding block is disposed between the first boss and the second boss and the rear flange portion respectively.

[0018] Optionally, a widened buffer portion is provided at the end of the main connecting strip, and a conical connecting block is connected between the buffer portion and the rear flange portion;

[0019] The large end of the tapered connection block is close to the buffer portion and the small end is close to the rear flange portion.

[0020] Optionally, an auxiliary connecting strip perpendicular to the main connecting strip is further connected between the central column and the rear flange portion;

[0021] The end of the auxiliary connecting strip is connected with a feeding ball, and the auxiliary connecting strip is connected to the rear flange part through the feeding ball.

[0022] The beneficial effect of the large-diameter ball valve wax mold structure with an inner central coaxial horizontal diversion channel provided by the present application is that: compared with the prior art, the large-diameter ball valve wax mold structure with an inner central coaxial horizontal diversion channel in the present application is provided with a central column passing through the spherical shell portion, the central column is coaxially arranged with the front flange portion and the rear flange portion arranged on the spherical shell portion, a diversion portion symmetrical about the central column is arranged between the central column and the front flange portion, and a main connecting strip symmetrical about the central column is arranged between the central column and the rear flange portion. In this way, after the wax mold is made and formed, the supporting effect of the center column and the diversion part reduces the pressure of the upper components such as the main connecting strip, the gate part, the riser part, the auxiliary connecting strip, the shrinkage ball and the like on the spherical shell part, effectively preventing the spherical shell part from deforming under heavy pressure; on the other hand, the center column and the diversion part together with the main connecting strip and the auxiliary connecting strip constitute a radial support structure for the rear flange part, further avoiding the deformation of the spherical shell part in the radial direction. In this way, the shell formed by the wax mold of the present application after the shell making, dewaxing and sintering steps also has the same supporting effect, effectively improving the stability of the shell and avoiding deformation of the shell. During the casting of molten steel, when casting from the gate part connected to the center column and parallel to the center column, the casting molten steel can flow quickly and evenly to the front flange part and the rear flange part, which can not only reduce the impact force of the casting molten steel on the cavity of the spherical shell part during the casting process, reduce the scouring effect on the cavity of the spherical shell part, improve the flow efficiency, but also help to improve the casting quality of large-diameter ball valves, which is far superior to the prior art. In addition, in the present application, the gate portion and the riser portion are arranged on the same side of the central column, which is very convenient for observing the casting progress and is beneficial to further improving the casting quality of the large-diameter ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 The overall structure of the large-diameter ball valve wax model structure with an inner central coaxial horizontal diversion flow channel provided in the embodiment of the present application is schematically shown. Figure 1 ;

[0025] Figure 2 The overall structure of the large-diameter ball valve wax model structure with an inner central coaxial horizontal diversion flow channel provided in the embodiment of the present application is schematically shown. Figure 2 ;

[0026] Figure 3 A schematic diagram of the front view of a wax model structure of a large-diameter ball valve with an inner centrally placed coaxial horizontal flow-dividing channel provided in an embodiment of the present application;

[0027] Figure 4 For along Figure 3 The cross-sectional structure diagram along the AA line;

[0028] Figure 5 For along Figure 4 Cross-sectional structure diagram along line BB.

[0029] Among them, the figure marks in the figure are: 101, spherical shell part; 102, front flange part; 103, rear flange part; 104, center column; 105, diverter part; 106, main connecting strip; 107, gate part; 108, riser part; 109, valve seat; 110, first end face; 111, second end face; 112, buffer plane; 113, through hole; 114, first boss; 115, second boss; 116, through hole; 117, reinforcing rib; 118, shrinkage block; 119, buffer part; 120, tapered connecting block; 121, auxiliary connecting strip; 122, shrinkage ball. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Please also read Figures 1 to 5 , a large-diameter ball valve wax mold structure with an inner central coaxial horizontal flow-dividing channel provided in an embodiment of the present application is now described. The large-diameter ball valve wax mold structure with an inner central coaxial horizontal flow-dividing channel comprises a ball shell portion 101, a center column 104, a gate portion 107 and a riser portion 108. Among them:

[0035] The opposite ends of the spherical shell 101 form a coaxial front flange 102 and a rear flange 103. The center column 104 passes through the spherical shell 101 along the central axis direction of the front flange 102 and the rear flange 103. The front flange 102 is connected to the center column 104 through the diverter 105, and the rear flange 103 is connected to the center column 104 through the main connecting bar 106. The main connecting bar 106 and the diverter 105 are symmetrical about the center column 104. The gate 107 is connected to the end of the center column 104 close to the main connecting bar 106 and extends in a direction parallel to the center column 104. The riser 108 is connected to the main connecting bar 106 and is spaced apart from the gate 107. The extension direction of the riser 108 is parallel to the extension direction of the gate 107.

[0036] According to the above structure provided in the present embodiment, a diverter portion 105 symmetrical to the center column 104 is provided between the center column 104 and the front flange portion 102, and a main connecting bar 106 symmetrical to the center column 104 is provided between the center column 104 and the rear flange portion 103. After the wax mold is made and the wax mold is formed, the supporting effect of the center column 104 and the diverter portion 105, on the one hand, reduces the pressure of the main connecting bar 106, the gate portion 107, the riser portion 108, the auxiliary connecting bar 121, the shrinkage ball 122 and other upper components on the spherical shell portion 101, and effectively prevents the spherical shell portion 101 from deforming under heavy pressure; on the other hand, the center column 104 and the diverter portion 105 together with the main connecting bar 106 and the auxiliary connecting bar 121 constitute a radial support structure for the rear flange portion 103, further avoiding the deformation of the spherical shell portion 101 in the radial direction. In this way, the wax mold of the present application is used in the The shell formed after the shell making, dewaxing and sintering process also has the same supporting function, which effectively improves the stability of the shell and avoids shell deformation. At the same time, the wax mold structure forms a casting structure whose casting direction is parallel to the axial direction of the front flange part 102 and the rear flange part 103. During the casting of molten steel, when casting from the gate part 107 connected to the center column 104 and parallel to the center column 104, the casting molten steel can flow quickly and evenly to the front flange part 102 and the rear flange part 103, and quickly fill the spherical shell cavity, that is, the molten steel first enters the front flange part through the center column 104 and the diversion part 105. The spherical shell 101 and the lower end of the spherical shell 102 are thin-walled structures like the spherical shell 101, and the flow resistance of the molten steel is greater than the flow resistance of the molten steel in the central column 104 and the diverter 105. Here, the liquid level of the molten steel rises in the flow channel formed by the central column 104. At the same time, the liquid level of the molten steel in the spherical shell 101 also rises with the rise of the liquid level of the molten steel in the flow channel formed by the central column 104. The air therein is discharged through the flow channel formed by the main connecting strip 106 and the auxiliary connecting strip 121. When the liquid level of the molten steel in the central column 104 rises to the position of the main connecting strip 106, the molten steel quickly flows through the main connecting strip 106 and the auxiliary connecting strip 121. The flow channel formed by the auxiliary connecting strip 121 flows into the upper part of the spherical shell 101, which can not only reduce the impact force of the molten steel on the cavity of the spherical shell 101 during the casting process, reduce the scouring effect on the cavity of the spherical shell, and improve the flow efficiency, but also help to improve the casting quality of the large-diameter ball valve, which is far superior to the prior art. Since the main connecting strip 106 and the auxiliary connecting strip 121 are arranged in a cross shape, the molten steel can quickly flow into the cavity of the rear flange 103 and enter the upper cavity of the spherical shell 101, and merge with the molten steel rising from the bottom to make the filling speed of the cavity of the spherical shell 101 fast, avoiding casting defects such as cold shut. In addition, in this embodiment, the gate 107 and the riser 108 are arranged on the same side of the center column 104, which is very convenient for observing the casting progress, which is conducive to further improving the casting quality of the large-diameter ball valve.

[0037] In another embodiment of the present application, please refer to Figures 1 to 5 , the thickness of the diverter 105 in the radial direction of the center column 104 is the same as the diameter of the center column 104. According to the above structure provided in this embodiment, the diverter 105 with the same diameter as the center column 104 can significantly improve the flow stability of the molten steel in the diverter 105, which is conducive to further improving the casting quality of the large-diameter ball valve.

[0038] In another embodiment of the present application, please refer to Figures 1 to 5 A valve seat 109 is formed in the spherical shell 101 for mounting the valve core and adjacent to the front flange 102. The flow dividing portion 105 forms a first end face 110 and a second end face 111 opposite to each other along the axial direction of the central column 104. The first end face 110 extends to the adjoining part of the valve seat 109 and the front flange 102, and the second end face 111 extends to the end face of the front flange 102 away from the valve seat 109. The first end face 110 and the second end face 111 are both inclined relative to the central column 104.

[0039] According to the above structure provided in this embodiment, the first end face 110 and the second end face 111 are inclined relative to the central column 104, which is conducive to increasing the flow speed of the molten steel in the diverter 105, improving the molding efficiency of the ball valve, and making the air in the cavity easily discharged along the inclined surface, thereby avoiding the occurrence of pores in the casting. In addition, in this embodiment, the first end face 110 extends to the adjacent part of the valve seat 109 and the front flange 102, which is conducive to reducing the processing amount of the valve seat 109 and improving the production efficiency of large-diameter ball valves while ensuring the molding quality of the ball valve.

[0040] In another embodiment of the present application, please refer to Figures 1 to 5 , the diverter 105 forms a buffer plane 112 connected to the second end face 111 and perpendicular to the center column 104, the center of the buffer plane 112 is coaxially arranged with the center column 104 and the buffer plane 112 is symmetrical about the center column 104. According to the above structure provided in this embodiment, when the molten steel flows from the flow channel formed by the center column 104 to the diverter 105, the buffer plane 112 parallel to the center column 104 can not only reduce the flow impact force of the casting molten steel on the front flange 102, but also improve the distribution uniformity of the casting material, thereby further improving the casting quality of the large-diameter ball valve; at the same time, there is a specific concave spacing between the buffer plane 112 and the end face of the front flange 102, so that when the wax mold is placed, the end face of the front flange 102 can be fully flattened and contacted with the bearing table, ensuring the placement stability of the wax mold structure and further avoiding the deformation of the wax mold.

[0041] In another embodiment of the present application, please refer to Figures 1 to 5, the first end faces 110 located on opposite sides of the center column 104 form an angle of 90°. According to the above structure provided in this embodiment, the first end face 110 adopts the above angle size to further improve the distribution uniformity of the casting material, thereby improving the casting quality of the large-diameter ball valve.

[0042] In another embodiment of the present application, please refer to Figures 1 to 5 , a through hole 113 is provided on the front flange 102 for the central column 104 to pass through, and the diameter d of the central column 104 is one third of the aperture D of the through hole 113. According to the above structure provided in this embodiment, the central column 104 adopts the above diameter size to better adapt to the size of the through hole 113 on the front flange 102 and provide better molding quality for the front flange 102, which is conducive to further improving the casting quality of large-diameter ball valves; specifically, by providing the central column 104 and the diverter 105, and because the central column 104 and the diverter 105 are located at the center of the ball shell 101, the front flange 102 and the rear flange 103, the molten steel in the central column 104 and the diverter 105 dissipates heat slowly, that is, the molten steel in the central column 104 and the diverter 105 cools down slowly. However, the solidification speed is slower than that of the molten steel in the spherical shell part 101, the front flange part 102 and the rear flange part 103. In this way, the molten steel in the central column 104 and the diverter part 105 can be fully supplemented during the cooling and solidification of the molten steel in the spherical shell part 101, the front flange part 102 and the rear flange part 103, so that the location where the casting defects occur is transferred to the central column 104 and the diverter part 105, thereby ensuring the casting quality of the spherical shell part 101, the front flange part 102 and the rear flange part 103, especially the valve seat 109 located on the inner side of the front flange part 102, that is, ensuring the casting quality of the ball valve body.

[0043] In another embodiment of the present application, please refer to Figures 1 to 5, the spherical shell 101 is provided with a first boss 114 and a second boss 115 in a direction parallel to the main connecting strip 106, the first boss 114 and the second boss 115 are provided with corresponding through holes 116, and the outer diameter of the first boss 114 is larger than the outer diameter of the second boss 115, and a reinforcing rib 117 is provided between the side of the center column 104 that is biased toward the first boss 114 and the main connecting strip 106. According to the above structure provided in this embodiment, the through holes 116 correspondingly provided on the first boss 114 and the second boss 115 can be used to install a valve stem that controls the rotation of the valve core. Since a reinforcing rib 117 is provided between the side of the center column 104 that is biased toward the first boss 114 and the main connecting bar 106, not only can the overall strength of the wax mold structure of the large-diameter ball valve with an inner central coaxial horizontal diversion channel provided in this embodiment be improved, but it can also serve as a flow channel for the casting molten steel and increase the speed of the casting molten steel flowing to the first boss 114, so that the casting molten steel is more evenly distributed on the first boss 114 and the second boss 115, which is beneficial to further improve the casting quality of the large-diameter ball valve.

[0044] In another embodiment of the present application, please refer to Figures 1 to 5 A feeding block 118 is provided between the first boss 114 and the second boss 115 and the rear flange portion 103. According to the above structure provided in this embodiment, the feeding block 118 can supplement the casting molten steel for the casting of the first boss 114 and the second boss 115, which can significantly avoid the occurrence of casting defects such as shrinkage cavities or shrinkage porosity on the first boss 114 and the second boss 115, which is conducive to further improving the casting quality of the large-diameter ball valve.

[0045] In another embodiment of the present application, please refer to Figures 1 to 5 , a widened buffer portion 119 is provided at the end of the main connecting strip 106, a tapered connecting block 120 is connected between the buffer portion 119 and the rear flange portion 103, and the large end of the tapered connecting block 120 is close to the buffer portion 119 and the small end is close to the rear flange portion 103. According to the above structure provided in this embodiment, since the main connecting strip 106 is sequentially connected to the rear flange portion 103 through the buffer portion 119 and the tapered connecting block, on the one hand, the casting molten steel can reduce the flow impact force in the buffer portion 119, thereby improving the distribution uniformity of the casting material; on the other hand, the molding efficiency of the rear flange portion 103 can be accurately controlled by the tapered connecting block 120, reducing the difficulty of removing the tapered connecting block 120 after the casting is formed, and avoiding the formation of shrinkage and other defects between the tapered connecting block 120 and the rear flange portion 103, which is conducive to further improving the casting quality of the large-diameter ball valve.

[0046] In another embodiment of the present application, please refer to Figures 1 to 5, an auxiliary connecting strip 121 perpendicular to the main connecting strip 106 is also connected between the center column 104 and the rear flange 103, and a feeding ball 122 is connected to the end of the auxiliary connecting strip 121, and the auxiliary connecting strip 121 is connected to the rear flange 103 through the feeding ball 122. According to the above structure provided in this embodiment, the auxiliary connecting strip 121 can improve the overall strength of the wax mold structure of the large-diameter ball valve with an inner central coaxial horizontal diversion flow channel provided in this embodiment on the one hand; on the other hand, it can also improve the molding efficiency and molding quality of the rear flange 103. In addition, the feeding ball 122 in this embodiment can supplement the casting molten steel for the molding process of the rear flange 103 and avoid the occurrence of shrinkage holes or shrinkage defects such as shrinkage in the rear flange 103, which is conducive to further improving the casting quality of the large-diameter ball valve.

[0047] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. Large-diameter ball valve wax mold structure with inner center coaxial horizontal diversion flow channel, It is characterized in that include: The spherical shell portion (101) has a coaxial front flange portion (102) and a rear flange portion (103) formed at opposite ends; a central column (104) passing through the spherical shell portion (101) along the central axis direction of the front flange portion (102) and the rear flange portion (103); the front flange portion (102) is connected to the central column (104) via a flow divider portion (105); the rear flange portion (103) is connected to the central column (104) via a main connecting strip (106); the main connecting strip (106) and the flow divider portion (105) are both symmetrical about the central column (104); A gate portion (107) connected to an end of the central column (104) close to the main connecting strip (106) and extending in a direction parallel to the central column (104); A riser portion (108) is connected to the main connecting strip (106) and is spaced apart from the gate portion (107); an extension direction of the riser portion (108) is parallel to an extension direction of the gate portion (107).

2. The wax model structure of a large-diameter ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 1, Features: The thickness of the flow dividing portion (105) in the radial direction of the central column (104) is the same as the diameter of the central column (104).

3. The wax model structure of a large-diameter ball valve with an inner central coaxial horizontal flow-dividing channel according to claim 2, Features: A valve seat (109) is formed in the spherical shell portion (101) and is used to install a valve core and is adjacent to the front flange portion (102); The diverter portion (105) forms a first end face (110) and a second end face (111) opposite to each other along the axial direction of the center column (104), wherein the first end face (110) extends to the adjoining position of the valve seat (109) and the front flange portion (102), and the second end face (111) extends to the end face of the front flange portion (102) away from the valve seat (109), and both the first end face (110) and the second end face (111) are inclined relative to the center column (104).

4. The wax model structure of a large-caliber ball valve with an inner central coaxial horizontal flow-dividing channel according to claim 3, Features: The flow dividing portion (105) forms a buffer plane (112) connected to the second end surface (111) and perpendicular to the central column (104); the center of the buffer plane (112) is coaxially arranged with the central column (104) and the buffer plane (112) is symmetrical with respect to the central column (104).

5. The wax model structure of a large-diameter ball valve with an inner central coaxial horizontal flow-dividing channel according to claim 3, Features: The first end surfaces (110) located on two opposite sides of the central column (104) form an angle of 90°.

6. The wax model structure of a large-caliber ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 1, Features: The front flange portion (102) is provided with a through hole (113) for the central column (104) to pass through, and the diameter d of the central column (104) is one third of the hole diameter D of the through hole (113).

7. The wax model structure of a large-caliber ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 1, Features: A first boss (114) and a second boss (115) are provided on the spherical shell portion (101) in a direction parallel to the main connecting strip (106), and corresponding through holes (116) are provided on the first boss (114) and the second boss (115), and the outer diameter of the first boss (114) is greater than the outer diameter of the second boss (115); A reinforcing rib (117) is provided between the side of the central column (104) that is biased towards the first boss (114) and the main connecting bar (106).

8. The wax model structure of a large-diameter ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 7, Features: A feeding block (118) is provided between the first boss (114) and the second boss (115) and the rear flange portion (103) respectively.

9. The wax model structure of a large-caliber ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 1, Features: A widened buffer portion (119) is provided at the end of the main connecting strip (106), and a conical connecting block (120) is connected between the buffer portion (119) and the rear flange portion (103); The large end of the conical connection block (120) is close to the buffer portion (119) and the small end is close to the rear flange portion (103).

10. The wax model structure of a large-caliber ball valve with an inner centrally placed coaxial horizontal flow-dividing channel according to claim 9, Features: An auxiliary connecting strip (121) perpendicular to the main connecting strip (106) is also connected between the central column (104) and the rear flange portion (103); The end of the auxiliary connecting strip (121) is connected to a feeding ball (122), and the auxiliary connecting strip (121) is connected to the rear flange portion (103) via the feeding ball (122).

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