Turbine partition plate casting forming mold

Abstract

The invention belongs to the field of steam turbines, and provides a steam turbine partition plate casting forming mold which comprises a first set of mold and a second set of mold. Wherein the first set of mold comprises a shell, an inner ring, blade outer ring movable blocks and inner ring movable blocks, the inner ring is connected to the shell and matched with the shell to form a first containing cavity, the outer ring movable blocks are sequentially arranged in the first containing cavity and abut against the inner side wall of the shell, and the inner ring movable blocks are sequentially arranged in the first containing cavity and abut against the inner ring; the two opposite sides of the blades are detachably connected to the outer ring movable block and the inner ring movable block correspondingly and can be supported by the outer ring movable block and the inner ring movable block so that the blades can be evenly arranged at intervals according to a preset arc-shaped path, the second set of mold comprises an upper mold and a lower mold which are detachably connected, and the upper mold is matched with the lower mold to form a second containing cavity; the sand core and the blade are used for being arranged in the second containing cavity to be matched with the upper die and the lower die to form a final cavity used for forming the target steam turbine partition plate.

Description

Technical Field

[0001] The present application belongs to the field of steam turbines, and in particular relates to a steam turbine partition casting mold. Background Art

[0002] As an important component of the steam turbine, the performance of the turbine diaphragm directly affects the overall operating efficiency and reliability of the steam turbine.

[0003] In the traditional casting method, there is a method of casting blades together with other structures (such as baffle bodies), but due to various factors in the casting process (such as temperature gradient, metal flow, etc.), it is often difficult to ensure that the quality of the blades meets the design requirements. In order to solve this problem, there is a method in the prior art of first casting the blades and then combining them with other parts (such as baffle bodies) for casting. Although this method improves the quality of the blades to a certain extent, since the blades need to be evenly spaced according to a predetermined arc path, a complex support structure is required to ensure the position and stability of the blades during the casting process. This not only increases the complexity of the mold, but also leads to reduced production efficiency and increased costs. Therefore, it is necessary to solve the above technical problems. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a steam turbine diaphragm casting mold to solve the technical problem of low efficiency in steam turbine diaphragm casting in the prior art.

[0005] To achieve the above purpose, the technical solution adopted in this application is: to provide a steam turbine diaphragm casting mold, comprising: A first set of molds is used for molding a sand core, wherein the sand core is used to position a plurality of blades in a preset posture and interval. The first set of molds includes a shell, an inner ring, a plurality of blades, and a plurality of outer ring movable blocks and a plurality of inner ring movable blocks arranged in pairs corresponding to the number of blades. The inner ring is connected to the shell and cooperates with the shell to form a first accommodating cavity with an open top. The outer ring movable blocks are arranged in sequence in the first accommodating cavity and abut against the inner side wall of the shell. The inner ring movable blocks are arranged in sequence in the first accommodating cavity and abut against the inner ring. The opposite sides of the blades are detachably connected to the outer ring movable blocks and the inner ring movable blocks respectively and can be supported by the outer ring movable blocks and the inner ring movable blocks to be evenly spaced according to a predetermined arc path. All the blades, all the outer ring movable blocks and all the inner ring movable blocks together constitute an intermediate cavity for molding the sand core. The top opening of the first accommodating cavity is set to a preset size so that the sand core can be integrally removed from the first accommodating cavity with all the blades, all the outer ring movable blocks and all the inner ring movable blocks after molding. The second set of molds includes an upper mold and a lower mold that are detachably connected. The upper mold cooperates with the lower mold to form a second accommodating cavity. The upper mold is also provided with a pouring spout connected to the second accommodating cavity. The sand core and the blades are used to be arranged in the second accommodating cavity to cooperate with the upper mold and the lower mold to form a final cavity for molding a target turbine partition.

[0006] Optionally, the first set of molds also includes a positioning ring padded at the bottom of the inner ring block, the positioning ring is used to support the inner ring block and one side surface of the blade to form a serrated shape for positioning the inner ring block and the blade.

[0007] Optionally, the first set of molds further comprises a guide rail padded at the bottom of the outer ring movable block, the guide rail being used to support a side surface of the outer ring movable block to form a step so as to cooperate with the inner side wall of the shell to form a sliding fit clamping on the outer ring movable block; When the inner ring movable block and the positioning ring position the blade, the corresponding outer ring movable block can be adaptively displaced relative to the guide rail along the extension direction of the guide rail.

[0008] Optionally, the first set of molds further includes an outer bead and an inner bead; The outer pressure strip is pressed against the top of the outer ring movable block, and the inner pressure strip is pressed against the top of the inner ring movable block.

[0009] Optionally, the first set of molds further includes a baffle; The end of the shell and the end of the inner ring can be detachably connected to the baffle and cooperate with the baffle to form the first accommodating cavity. The outer ring movable block at the end, the inner ring movable block at the end, the end of the positioning ring, the end of the guide rail, the end of the outer pressure strip and the end of the inner pressure strip are all abutted on the baffle.

[0010] Optionally, the first set of molds further includes a stopper disposed in the first accommodating cavity and abutting against an inner side wall of the baffle; The two sides of the stopper are respectively in contact with the outer pressure strip, the inner pressure strip, the positioning ring, the guide rail, the outer ring movable block at the end, and the adjacent surfaces of the inner ring movable block to seal the two ends of the intermediate cavity.

[0011] Optionally, the shell and the inner ring are used to form surfaces of the first accommodating cavity, which are arranged to be inclined so that the cross-sectional shape of the first accommodating cavity in the blade arrangement direction is an inverted trapezoid with the large end facing the opening.

[0012] Optionally, the outer ring movable block and the inner ring movable block are respectively formed with arc-shaped cavities for accommodating the blades, and the inner ring movable block comprises a first inner movable block and a second inner movable block which are alternately abutted and matched to form the arc-shaped cavity; The second inner movable block is used to be arranged at an angle with the two opposite side walls abutting against the first inner movable block and gradually move away from each other in the direction toward the center of the inner circle. Assuming the angle is A, A=6°-8°.

[0013] Optionally, the arc-shaped cavity is a through cavity with openings at both ends; The arc-shaped cavity formed on the inner ring movable block also reserves a hollow area that is not filled by the blades, and the hollow area is located between the blades and the inner ring.

[0014] Optionally, the blade is provided with a plurality of through holes; The through holes are located on both sides of the middle cavity and are symmetrically arranged.

[0015] The beneficial effect of the steam turbine diaphragm casting mold provided by the present application is that: compared with the prior art, two sets of molds are provided in the steam turbine diaphragm casting mold provided by the present application. After the blades are processed, they can be supported by the outer ring block and the inner ring block in the first set of molds and evenly arranged in a preset arc path in the first accommodating cavity formed by the shell and the inner ring. Since the outer ring block and the inner ring block are respectively abutted on the shell and the inner ring and the two cooperate with the blades to form an intermediate cavity for forming the sand core. In this way, the sand core can be quickly formed by filling the intermediate cavity with molding sand. After the sand core is formed, it can be demolded from the first accommodating cavity as a whole with the blades and the outer ring block and the inner ring block. At this time, the blades are arranged in the sand core in a predetermined arrangement, because the outer ring block and the inner ring block are detachably connected to the blades. Therefore, after removing the outer ring block and the inner ring block from the blade, the blade and the formed sand core can be transferred together to the second accommodating cavity formed by the upper mold and the lower mold in the second set of molds. In this way, there is no need to provide additional support structure for the blade during the molding of other parts of the turbine partition. This can greatly simplify the complexity of the mold during the molding process of the turbine partition and is conducive to significantly improving the casting efficiency of the turbine partition, which is far superior to the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 creative labor.

[0017] Figure 1This is a schematic diagram of the overall structure of the first set of molds in the embodiment of the present application; Figure 2 The partial structure of the first set of molds in the embodiment of the present application is shown in FIG. Figure 1 ; Figure 3 This is a partial structural cross-sectional view of the first set of molds in the embodiment of the present application; Figure 4 The partial structure of the first set of molds in the embodiment of the present application is shown in FIG. Figure 2 ; Figure 5 The partial structure of the first set of molds in the embodiment of the present application is shown in FIG. Figure 3 ; Figure 6 This is a schematic diagram of the overall structure of the blade in the embodiment of the present application; Figure 7 Schematic diagram of the connection structure between the blade and the sand core in the embodiment of the present application Figure 1 ; Figure 8 Schematic diagram of the connection structure between the blade and the sand core in the embodiment of the present application Figure 2 ; Fig. 9 This is a schematic diagram of the overall structure of the second set of molds in the embodiment of the present application; Fig.10 This is a schematic diagram of the overall structure of the casting of the target turbine diaphragm in the embodiment of the present application.

[0018] Among them, the figure marks in the figure are: 101, shell; 102, inner ring; 103, blade; 104, outer ring movable block; 105, inner ring movable block; 106, first accommodating cavity; 107, intermediate cavity; 108, positioning ring; 1081, first positioning surface; 1082, second positioning surface; 109, guide rail; 110, outer pressure strip; 111, inner pressure strip; 112, baffle; 113, block; 114, arc cavity; 115, hollow area; 131, through hole; 151, first inner movable block; 152, second inner movable block; 201, upper mold; 202, lower mold; 203, second accommodating cavity; 204, pouring head; 205, positioning ring groove; 1000, sand core; 1001, positioning ring platform; 2000, target turbine partition. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Please also read Figures 1 to 10 Now, a steam turbine diaphragm casting mold provided in the embodiment of the present application is described. The steam turbine diaphragm casting mold includes a first set of molds and a second set of molds. Among them: The first set of molds is used to form a sand core 1000, and the sand core 1000 is used to position a plurality of blades 103 in a preset posture and interval. The first set of molds includes a shell 101, an inner ring 102, a plurality of blades 103, and a plurality of outer ring movable blocks 104 and a plurality of inner ring movable blocks 105 arranged in pairs corresponding to the number of blades 103. The inner ring 102 is connected to the shell 101 and cooperates with the shell 101 to form a first accommodating cavity 106 with an open top. The outer ring movable blocks 104 are arranged in sequence in the first accommodating cavity 106 and abut against the inner wall of the shell 101. The inner ring movable blocks 105 are arranged in sequence in the first accommodating cavity 106 and abut against the inner wall of the shell 101. On the inner ring 102, opposite sides of the blades 103 are detachably connected to the outer ring movable block 104 and the inner ring movable block 105 respectively and can be supported by the outer ring movable block 104 and the inner ring movable block 105 to be evenly spaced and arranged according to a predetermined arc path. All the blades 103, all the outer ring movable blocks 104 and all the inner ring movable blocks 105 together constitute an intermediate cavity 107 for molding the sand core 1000. The top opening of the first accommodating cavity 106 is set to a preset size so that the sand core 1000 can be integrally removed from the first accommodating cavity 106 with all the blades 103, all the outer ring movable blocks 104 and all the inner ring movable blocks 105 after molding. The second set of molds includes an upper mold 201 and a lower mold 202 that are detachably connected. The upper mold 201 cooperates with the lower mold 202 to form a second accommodating cavity 203. The upper mold 201 is also provided with a pouring spout 204 connected to the second accommodating cavity 203. The sand core 1000 and the blade 103 are used to be arranged in the second accommodating cavity 203 to cooperate with the upper mold 201 and the lower mold 202 to form a final cavity for molding the target turbine partition 2000.

[0024] According to the above structure provided in this embodiment, two sets of molds are provided in the steam turbine diaphragm casting mold provided in this embodiment. After the blades 103 are processed, they can be supported by the outer ring block 104 and the inner ring block 105 in the first set of molds and evenly arranged in a preset arc path in the first accommodating cavity 106 formed by the shell 101 and the inner ring 102. Since the outer ring block 104 and the inner ring block 105 are respectively abutted on the shell 101 and the inner ring 102, and the two cooperate with the blade 103, the outer bead 110, the inner bead 111, the positioning ring 108, and the guide rail 109 to form an intermediate cavity 107 for molding the sand core 1000. In this way, the sand core 1000 can be quickly molded by filling the molding sand in the intermediate cavity 107. After the sand core 1000 is molded, it can be demoulded from the first accommodating cavity 106 as a whole with the blade 103, the outer ring block 104, and the inner ring block 105. At this time, the blades 103 are fixedly arranged in the sand core 1000 in a predetermined arrangement, because the outer ring movable block 104 and the inner ring movable block 105 are detachably connected to the blades 103. Therefore, after the outer ring movable block 104 and the inner ring movable block 105 are removed from the blades 103, the blades 103 and the formed sand core 1000 can be transferred together to the second accommodating cavity 203 formed by the upper mold 201 and the lower mold 202 in the second set of molds, so that in the process of molding other parts of the steam turbine diaphragm structure, it is not necessary to provide another support structure for the blades 103, thereby greatly simplifying the mold complexity of the steam turbine diaphragm during the molding process and significantly improving the casting efficiency of the steam turbine diaphragm, which is far superior to the existing technology.

[0025] In another embodiment of the present application, please refer to Figures 1 to 10The first set of molds also includes a positioning ring 108 padded at the bottom of the inner ring block 105, and the positioning ring 108 is used to support the inner ring block 105 and the blade 103 on one side surface to form a serrated shape for positioning the inner ring block 105 and the blade 103. According to the above structure provided in the present embodiment, in the serrated structure formed on the top of the positioning ring 108, each tooth shape includes a first positioning surface 1081 and a second positioning surface 1082 connected, wherein the first positioning surface 1081 is coplanar with the axial center line of the positioning ring 108, and the second positioning surface 1082 is concave and extends in an arc shape along the circumference of the positioning ring 108, and the arc shape is adapted to at least a section of the back side of the blade 103. In this way, when assembling the first mold, an outer ring movable block 104 at the front end is installed on the guide rail 109 in sequence, and then the blade 103 is placed on a corresponding second positioning surface 1082 and its longitudinal edge abuts against the first positioning surface 108, and the end face of the blade 103 facing the inner ring 102 abuts against the vertical wall of the inner ring 102. At this time, the other end of the blade 103 is supported by the outer ring movable block 104, and then a second inner movable block 152 is installed on the inner arc surface of the blade 103 and The second inner movable block 152 is connected to the first positioning surface 1081, and then a first inner movable block 151 is installed on the second inner movable block 152 so that it is also in contact with the first positioning surface 1081; in this way, the operation is performed from beginning to end in sequence, and the installation of all blades 103 and the outer ring movable block 104 and the inner ring movable block 105 can be completed quickly and accurately, which is conducive to further improving the assembly efficiency of the turbine diaphragm casting mold in this embodiment and ensuring the positioning accuracy of the blade 103. Here, it can be understood that the outer ring movable block 104 and the inner ring movable block 105 located at the head and tail of the positioning ring 108 and the guide rail 109 are processed so that they are parallel to the baffle 112 after installation, that is, the outer ring movable block 104 and the inner ring movable block 105 located at the head and tail of the positioning ring 108 and the guide rail 109 are only a part of the outer ring movable block 104 and the inner ring movable block 105 to facilitate the assembly of the first mold.

[0026] In another embodiment of the present application, please refer to Figures 1 to 10The first set of molds also includes a guide rail 109 cushioned at the bottom of the outer ring movable block 104. The guide rail 109 is used to support the outer ring movable block 104 to form a step on one side surface to cooperate with the inner side wall of the shell 101 to form a sliding fit clamping on the outer ring movable block 104; when the inner ring movable block 105 and the positioning ring 108 position the blade 103, the corresponding outer ring movable block 104 can be adaptively displaced relative to the guide rail 109 along the extension direction of the guide rail 109. According to the above structure provided in this embodiment, the step formed on the guide rail 109 can improve the position stability of the outer ring movable block 104 during the molding of the sand core 1000 by cooperating with the shell 101 to clamp the outer ring movable block 104. In addition, since the inner ring movable block 105 is precisely positioned by the sawtooth structure arranged on the positioning ring 108, when the inner ring movable block 105 positions the blade 103, the outer ring movable block 104 can perform an appropriate adaptive sliding position along the guide direction of the guide rail 109 under the action of the blade 103. It can be understood that the displacement size during the adaptive sliding position is within the range permitted by the process; in this way, the outer ring movable block 104 that can slide relative to the guide rail 109 can also eliminate part of the processing error and be better used to support the blade 103, which is conducive to further improving the assembly efficiency of the turbine diaphragm casting mold in this embodiment, avoiding additional additional stress on the blade 103, and effectively ensuring the accuracy of the blade 103.

[0027] It can be understood that, as a preferred embodiment, the purpose of setting the guide rail 109 close to the inner wall of the shell 101 and the positioning ring 108 close to the inner ring 102 is to make full use of the larger activity space on one side of the shell 101. This is conducive to smoother installation of the outer ring block 104 on the guide rail 109. At the same time, when the blade 103 is positioned by the positioning ring 108, the outer ring block 104 can better adapt to the matching position.

[0028] In another embodiment of the present application, please refer to Figures 1 to 10The first set of molds also includes an outer pressure strip 110 and an inner pressure strip 111; the outer pressure strip 110 presses against the top of the outer ring movable block 104, and the inner pressure strip 111 presses against the top of the inner ring movable block 105. According to the above structure provided in this embodiment, the outer pressure strip 110 pressed against the top of the outer ring movable block 104 and the inner pressure strip 111 pressed against the top of the inner ring movable block 105 can effectively improve the position stability of the outer ring movable block 104 and the inner ring movable block 105 during the molding process of the sand core 1000, which is beneficial to further improve the casting efficiency of the turbine diaphragm casting mold in this embodiment. Here, the outer pressure strip 110 and the inner pressure strip 111 can be connected to the inner ring 102 and the shell 101 respectively by fasteners, or an external pressure can be applied, such as applying a heavy object to the upper end surface of the outer pressure strip 110 and the inner pressure strip 111 to press the outer pressure strip 110 and the inner pressure strip 111 on the corresponding outer ring movable block 104 and the inner ring movable block 105, or the outer pressure strip 110 and the inner pressure strip 111 can be pressed on the corresponding outer ring movable block 104 and the inner ring movable block 105 by their own weight, which can be flexibly selected according to on-site conditions.

[0029] Here, the portion of the intermediate cavity 107 between the outer pressure strip 110 and the inner pressure strip 111 and between the positioning ring 108 and the guide rail 109 is also used to form a positioning ring platform 1001 respectively, so that the sand core 1000 can be accurately positioned in the second accommodating cavity 203 by cooperating with the positioning ring platform 1001 and the positioning ring groove 205 arranged in the upper mold 201 and the lower mold 202 of the second mold.

[0030] In another embodiment of the present application, please refer to Figures 1 to 10 , the first set of molds also includes a baffle 112; the ends of the shell 101 and the inner ring 102 can be detachably connected to the baffle 112 and cooperate with the baffle 112 to form a first accommodating cavity 106, and the outer ring movable block 104 located at the end, the inner ring movable block 105 located at the end, the end of the positioning ring 108, the end of the guide rail 109, the end of the outer pressure strip 110 and the end of the inner pressure strip 111 are all abutted on the baffle 112. According to the above structure provided in this embodiment, the baffle 112 detachably connected to the shell 101 and the inner ring 102 can be separated from the shell 101 and the inner ring 102 to open the two ends of the first accommodating cavity 106, which can make it more convenient to initially arrange the outer ring movable block 104, the inner ring movable block 105 and the blade 103 in the first accommodating cavity 106, which is conducive to further improving the assembly efficiency of the turbine diaphragm casting molding mold in this embodiment and further improving the casting efficiency. It can be understood that in order to better resist the outer ring block 104 and the inner ring block 105, the outer ring block 104 and the inner ring block 105 arranged at the end can be flatly attached to the baffle 112 by processing the corresponding cut surfaces, which is conducive to better maintaining the position stability of the outer ring block 104 and the inner ring block 105 during the molding process of the sand core 1000.

[0031] In another embodiment of the present application, please refer to Figures 1 to 10 The first set of molds also includes a stopper 113 disposed in the first accommodating cavity 106 and abutting against the inner wall of the baffle 112; the two sides of the stopper 113 respectively abut against the adjacent surfaces of the outer pressure strip 110, the inner pressure strip 111, the positioning ring 108, the guide rail 109, the outer ring movable block 104 at the end, and the inner ring movable block 105 to block the two ends of the intermediate cavity 107. According to the above structure provided in this embodiment, the stopper 113 disposed at the starting point and the end point of the arc path formed by the positioning ring 108 and the guide rail 109 can be flexibly positioned according to the molding shape of the sand core 1000, which is conducive to further improving the stability of the steam turbine diaphragm casting molding mold in this embodiment, thereby improving the molding quality of the sand core 1000.

[0032] In another embodiment of the present application, please refer to Figures 1 to 10 , the surfaces of the shell 101 and the inner ring 102 used to form the first accommodating cavity 106 are inclined so that the cross-sectional shape of the first accommodating cavity 106 in the arrangement direction of the blades 103 is an inverted trapezoid with the large end facing the open end. According to the above structure provided in this embodiment, the cross-sectional shape of the first accommodating cavity 106 in the arrangement direction of the blades 103 is set to an inverted trapezoid, which is conducive to the overall formation of the sand core 1000, the blades 103, the outer ring movable block 104 and the inner ring movable block 105 to be more convenient for demolding. This is conducive to further improving the molding efficiency of the sand core 1000 of the turbine diaphragm casting mold in this embodiment. It can be understood that in the embodiment provided with a positioning ring 108, a guide rail 109, an outer pressure strip 110 and an inner pressure strip 111, the first accommodating cavity 106 is set to the above-mentioned cross-sectional shape, which is also conducive to the demolding of this part of the structure, which will not be repeated here. In the actual production process, please refer to Figure 3 As shown, the inner ring 102 and the side wall of the housing 101 used to form the first accommodating cavity 106 can be set to an angle B, and the preferred angle B is set to 3-5 degrees to facilitate demoulding. For ease of description, this embodiment takes the angle of 5 degrees formed between the two as an example for description.

[0033] In another embodiment of the present application, please refer to Figures 1 to 10 The outer ring block 104 and the inner ring block 105 respectively form an arc cavity 114 for accommodating the blade 103. The inner ring block 105 includes a first inner block 151 and a second inner block 152 that alternately abut and cooperate to form the arc cavity 114; wherein the second inner block 152 is used to be set at an angle with the opposite side walls of the first inner block 151 and gradually move away from each other in the direction toward the center of the inner ring 102. Assuming that the angle is A, then A=6°-8°. For ease of explanation, focus on Figure 5In this embodiment, the second inner movable block 152 is used to form an angle of 7° between the two opposite side walls abutting against the first inner movable block 151 as an example for explanation.

[0034] According to the above structure provided in the present embodiment, the significance of dividing the inner ring block 105 into a first inner block 151 and a second inner block 152 in the present embodiment is that the inner ring block 105 is also evenly arranged according to the arc path when the blades 103 are assembled, and after the sand core 1000 is formed, the direction in which the inner ring block 105 detaches from the blades 103 is toward the center of the arc path formed by the arrangement of the blades 103, so setting the inner ring block 105 as a whole is not conducive to detachment from the blades 103. After the inner ring movable block 105 is set to alternately abut the first inner movable block 151 and the second inner movable block 152, the two opposite side walls of the second inner movable block 152 for abutting against the first inner movable block 151 can be set at an angle and gradually move away from each other in the direction toward the center of the inner ring 102, so that the second inner movable block 152 sandwiched between the two first inner movable blocks 151 can be easily removed from the blade 103 and the sand core 1000 first, and after the second inner movable block 152 is separated from the blade 103, the first inner movable block 151 also has sufficient space for movement and is easily removed from the blade 103 and the sand core 1000. This is conducive to further improving the sand core 1000 molding of the turbine diaphragm casting mold in this embodiment, thereby improving the casting efficiency. It should be noted that since the side walls used for abutment between adjacent outer ring blocks 104 gradually approach each other in the direction toward the center of the arc path, after leaving the first accommodating cavity 106, the outer ring block 104 itself can be easily removed from the side of the blade 103 away from the center of the arc path, so there is no need to divide it into two parts.

[0035] In another embodiment of the present application, please refer to Figures 1 to 10, the arc cavity 114 is a through cavity with openings at both ends; the arc cavity 114 formed on the inner ring movable block 105 also reserves a hollow area 115 that is not filled with blades 103, and the hollow area 115 is located between the blades 103 and the inner ring 102. According to the above structure provided in this embodiment, the hollow area 115 that is not filled with blades 103 reserved in the arc cavity 114 on the inner ring movable block 105 can facilitate external tools to be clamped in the hollow area 115, which can further facilitate the removal of the inner ring movable block 105 from the blades 103, which is conducive to further improving the casting efficiency of the turbine diaphragm casting mold in this embodiment. Here, it can be understood that the formation principle of the hollow area 115 is that the first inner movable block 151 and the second inner movable block 152 The inner wall is an arc-shaped structure with the same diameter as the inner ring 102 side wall, and the end face of the blade 103 is perpendicular to the longitudinal direction of the arc-shaped cavity 114, and the blade 103 has a set width. When the lower edge end face of the blade 103 abuts against the side wall of the inner ring 102, its end face is equivalent to being tangent to the side wall of the inner ring 102, so that the part of the end face that is not in contact with the side wall of the inner ring 102 moves away from the side wall of the inner ring 102 in the tangential direction, thereby reserving a hollow area 115 in the arc-shaped cavity 114 that is not filled by the blade 103.

[0036] In another embodiment of the present application, please refer to Figures 1 to 10 , a plurality of through holes 131 are provided on the blade 103; the through holes 131 are located on both sides of the middle cavity 107 and are symmetrically arranged. According to the above structure provided in this embodiment, during the process of molding other parts of the target steam turbine diaphragm 2000, the casting liquid can pass through the through holes 131 provided on the blade 103 to make the blade 103 and other parts of the target steam turbine diaphragm 2000 tightly combined. This is conducive to improving the molding quality of the steam turbine diaphragm casting molding mold in this embodiment.

[0037] It should be noted that in this embodiment, the blade 103 is usually made of 06Cr13Al material with a higher melting point (melting point between 1480-1530°C), while the other parts of the target steam turbine diaphragm 2000 are made of ductile iron QT400-18 material with a relatively low melting point (casting temperature at 1420°C), so that during the casting process of the other parts of the target steam turbine diaphragm 2000, the blade 103 can maintain good structural stability. Of course, those skilled in the art can also use other materials to prepare the steam turbine diaphragm, but it is necessary to ensure that the melting point of the blade 103 is higher than the casting temperature of the subsequent casting material, which will not be repeated here.

[0038] 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. A steam turbine diaphragm casting mold, characterized in that: include: A first set of molds is used to form a sand core (1000), wherein the sand core (1000) is used to position a plurality of blades (103) in a preset posture and interval, wherein the first set of molds comprises a shell (101), an inner ring (102), and a plurality of outer ring movable blocks (104) and a plurality of inner ring movable blocks (105) arranged in pairs corresponding to the number of the blades (103), wherein the inner ring (102) is connected to the shell (101) and cooperates with the shell (101) to form a first accommodating cavity (106) with an open top, wherein the outer ring movable blocks (104) are sequentially arranged in the first accommodating cavity (106) and abut against the inner side wall of the shell (101), and the inner ring movable blocks (105) are sequentially arranged in the first accommodating cavity (106) and abut against the inner ring (10 2), the opposite sides of the blades (103) are detachably connected to the outer ring movable block (104) and the inner ring movable block (105) respectively and can be supported by the outer ring movable block (104) and the inner ring movable block (105) to be evenly spaced and arranged according to a predetermined arc path, all the blades (103), all the outer ring movable blocks (104) and all the inner ring movable blocks (105) together constitute an intermediate cavity (107) for molding the sand core (1000), and the top opening of the first accommodating cavity (106) is set to a preset size so that the sand core (1000) can be integrally removed from the first accommodating cavity (106) after molding together with all the blades (103), all the outer ring movable blocks (104) and all the inner ring movable blocks (105); The second set of molds comprises an upper mold (201) and a lower mold (202) which are detachably connected, the upper mold (201) cooperates with the lower mold (202) to form a second accommodating cavity (203), the upper mold (201) is also provided with a pouring riser (204) connected to the second accommodating cavity (203), the sand core (1000) and the blade (103) are used to be arranged in the second accommodating cavity (203) to cooperate with the upper mold (201) and the lower mold (202) to form a final cavity for molding a target steam turbine diaphragm (2000).

2. The steam turbine diaphragm casting mold according to claim 1, characterized in that: The first set of molds also includes a positioning ring (108) cushioned at the bottom of the inner ring movable block (105), and the positioning ring (108) is used to support the inner ring movable block (105) and the blade (103) on one side surface to form a sawtooth shape for positioning the inner ring movable block (105) and the blade (103).

3. The steam turbine diaphragm casting mold according to claim 2, characterized in that: The first set of molds also includes a guide rail (109) padded at the bottom of the outer ring movable block (104), the guide rail (109) being used to support a side surface of the outer ring movable block (104) to form a step so as to cooperate with the inner side wall of the housing (101) to form a sliding fit and clamp the outer ring movable block (104); When the inner ring movable block (105) and the positioning ring (108) position the blade (103), the corresponding outer ring movable block (104) can be adaptively displaced relative to the guide rail (109) along the extension direction of the guide rail (109).

4. The steam turbine diaphragm casting mold according to claim 3, characterized in that: The first set of molds further comprises an outer press strip (110) and an inner press strip (111); The outer pressure strip (110) is pressed against the top of the outer ring movable block (104), and the inner pressure strip (111) is pressed against the top of the inner ring movable block (105).

5. The steam turbine diaphragm casting mold according to claim 4, characterized in that: The first set of molds also includes a baffle (112); The end of the shell (101) and the end of the inner ring (102) can be detachably connected to the baffle (112) and cooperate with the baffle (112) to form the first accommodating cavity (106), and the outer ring movable block (104) located at the end, the inner ring movable block (105) located at the end, the end of the positioning ring (108), the end of the guide rail (109), the end of the outer pressure strip (110) and the end of the inner pressure strip (111) are all abutted against the baffle (112).

6. The steam turbine diaphragm casting mold according to claim 5, characterized in that: The first set of molds also includes a stopper (113) disposed in the first accommodating cavity (106) and abutting against an inner side wall of the baffle (112); The two sides of the stopper (113) are respectively in contact with the adjacent surfaces of the outer pressure strip (110), the inner pressure strip (111), the positioning ring (108), the guide rail (109), the outer ring movable block (104) and the inner ring movable block (105) at the end, so as to seal the two ends of the intermediate cavity (107).

7. The steam turbine diaphragm casting mold according to any one of claims 1 to 6, characterized in that: The shell (101) and the inner ring (102) are used to form surfaces of the first accommodating cavity (106) and are arranged inclined so that the cross-sectional shape of the first accommodating cavity (106) in the arrangement direction of the blades (103) presents an inverted trapezoid with the large end facing the opening.

8. The steam turbine diaphragm casting mold according to claim 1, characterized in that: The outer ring movable block (104) and the inner ring movable block (105) respectively form arc-shaped cavities (114) for accommodating the blades (103); the inner ring movable block (105) comprises a first inner movable block (151) and a second inner movable block (152) which alternately abut and cooperate to form the arc-shaped cavity (114); The second inner movable block (152) is used to be arranged at an angle with the two opposite side walls of the first inner movable block (151) that abut against each other and gradually move away from each other in the direction toward the center of the inner circle (102). Assuming the angle is A, A=6°-8°.

9. The steam turbine diaphragm casting mold according to claim 8, characterized in that: The arc-shaped cavity (114) is a through cavity with openings at both ends; The arc-shaped cavity (114) formed on the inner ring movable block (105) also reserves a hollow area (115) that is not filled by the blade (103), and the hollow area (115) is located between the blade (103) and the inner ring (102).

10. The steam turbine diaphragm casting mold according to claim 1, characterized in that: The blade (103) is provided with a plurality of through holes (131); The through holes (131) are located on both sides of the middle cavity (107) and are symmetrically arranged.

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