Horizontal centrifugal pump body mold

Abstract

The application discloses a horizontal centrifugal pump body mold, which comprises an outer mold part and an inner mold part, the outer mold part is provided with a first movable part, a second movable part and a third movable part, a cavity is formed in the outer mold part and the first movable part, the second movable part and the third movable part jointly form a forming cavity, and a pouring port is arranged on the outer mold part; the inner mold part comprises a first mold core arranged in the forming cavity, a second mold core and a third mold core which are tightly matched on the first mold core. The mold is composed of multiple parts, and the first movable part, the second movable part and the third movable part are matched to form the outer contour surface of the centrifugal pump body, and the difficult-to-strip part is separately formed and stripped, so that the stripping difficulty is reduced, the integrity of the outer contour surface of the centrifugal pump body is ensured, the structure of the mold can be repeatedly used, the mold can be used to manufacture several centrifugal pump bodies of the same type, and the cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of pump body manufacturing, and in particular to a horizontal centrifugal pump body mold. Background Technology

[0002] Horizontal centrifugal pumps operate by using the centrifugal motion of a rotating impeller to pump water. They are primarily used for pumping water, oil, and other liquids. During operation, the motor drives the impeller within the pump body via a shaft. The impeller causes the liquid within the pump body to rotate and be accelerated. Due to the texture of the impeller, the energy of the liquid flow increases. The accelerated liquid enters the volute channel, where some of its velocity is converted into pressure and flows out, thus achieving the purpose of pumping the liquid. The pump body, as the part where the impeller acts, supports and fixes the impeller and connects to the bracket that mounts the bearings.

[0003] Die forging is a casting method that uses a die on specialized die forging equipment to shape a blank into a forging. Forgings produced by this method are not only dimensionally accurate but also have small machining allowances, high productivity, low cost, and require little operation and technical expertise, making them easy to manufacture. Therefore, various pump bodies are often produced using die forging. A horizontal centrifugal pump body has a volute flow channel, an outlet flange connecting to the volute flow channel, an inlet flange connecting to and coaxial with the volute flow channel, an outlet flange connecting to and coaxial with the volute flow channel, and feet located on the outer wall of the volute flow channel and distributed opposite to the outlet flange. Therefore, the outer contour structure of the horizontal centrifugal pump body is complex, especially the part between the flange openings and the volute flow channel. The diameter of this part varies, and due to the obstruction of the volute flow channel and the flange plates, it is difficult to achieve with a simple upper and lower mold structure. Furthermore, the volute flow channel has a vortex-shaped inner contour surface. Although it is not difficult to make an inner mold with the same inner contour surface structure as the pump body, the forging method requires demolding after the pump body has cooled and formed. That is, the various parts of the mold need to be peeled off from the formed pump body before the pump body can proceed to the next step. The maximum length of the inner mold part used to form the inner contour surface of the volute flow channel is obviously greater than that of the flange openings of the volute flow channel. Therefore, the inner mold part cannot be directly peeled off, which brings considerable difficulty to demolding. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a horizontal centrifugal pump body mold to solve the problem of difficult demolding of the horizontal centrifugal pump body.

[0005] To solve the above-mentioned technical problems, the present invention provides a horizontal centrifugal pump body mold, specifically including an outer mold part and an inner mold part. The outer mold part is formed by several interlocking parts, thereby dividing the outer mold part into several parts, making it easier to obtain a mold that can be used to produce centrifugal pump bodies. On the outer mold part, a first movable part adapted to a portion of the outer contour surface of the mounting flange, a second movable part adapted to a portion of the outer contour surface between the volute flow channel and the inlet flange, and two third movable parts adapted to portions of the outer contour surfaces of the two base feet are respectively movably arranged. The interior of the outer mold part forms a cavity, which, together with the first, second, and third movable parts, forms a molding cavity adapted to the outer contour surface of the horizontal centrifugal pump body. An injection port communicating with the molding cavity is formed on the outer mold part, thereby separately setting up those structurally complex and difficult-to-demold locations on the outer contour surface of the centrifugal pump body, so as to facilitate demolding of the outer surface of the molded centrifugal pump body. The complex structure of the pump body is demolded separately, which greatly reduces the demolding difficulty and avoids damage to the pump body. The inner mold includes a first mold core set in the molding cavity and adapted to the inner contour surface of the assembly flange, a second mold core tightly fitted on the first mold core and adapted to the inner contour surface of the volute flow channel and the inlet flange, and a third mold core set in the molding cavity and fitted to the inner contour surface of the outlet flange with one end attached to the second mold core. The end of the first mold core away from the second mold core extends further towards the end away from the second mold core to form an extension section that facilitates positioning with the outer mold. The ends of the first mold core, the second mold core, and the third mold core extend away from each other and are attached to the inner wall of the molding cavity, thereby forming a complete inner contour surface of the centrifugal pump body. The entire inner mold is divided into multiple parts, which can be peeled off in sections during demolding, thereby reducing the demolding difficulty and achieving non-destructive demolding of the centrifugal pump body. At the same time, the entire mold can be reused to save costs.

[0006] Furthermore, the outer mold portion includes a front mold, a middle mold, and a rear mold that are sequentially interlocked. The front mold and the middle mold each have a first cavity and a second cavity formed in half on their opposing sides, which are adapted to and interconnected with the outer contour surfaces of the volute flow channel, the outlet flange, and the base. The front mold has a third cavity recessed on its side facing the middle mold and located on the inner wall of the first cavity, facing away from the middle mold, which is adapted to the outer contour surface of the assembly flange. The volute flow channel, the outlet flange, and the base are relatively symmetrical. The front mold and the middle mold, when combined, can essentially complete the mold manufacturing of the outer contour surface of this part of the pump body structure, making manufacturing convenient and demolding relatively simple. On the side of the middle mold facing the rear mold, opposite the second cavity, a fourth cavity is recessed on its side facing the second cavity, which is adapted to the outer contour surface of the inlet flange and connects to the second cavity. The rear mold has a fourth cavity recessed on its side facing the middle mold and opposite the fourth cavity. A first forming surface is formed on one side of the body, which is adapted to the outer contour surface of the inlet flange facing away from the volute flow channel, to form the structure of the inlet flange. At the same time, it is convenient to separate the centrifugal pump body from the mold during demolding. The first movable part is set in the third cavity, the second movable part is set in the second cavity, and the third movable part is set on the front mold and the rear mold, so that the parts that obstruct demolding are set separately, so that they are not affected by the front mold and the middle mold during demolding, and can be peeled from the direction of the centrifugal pump body that is not extruded, ensuring the integrity of the centrifugal pump body. The first mold core, the second mold core and the third mold core are all set between the front mold and the middle mold. The end of the first mold core away from the second mold core is attached to the side of the third cavity away from the first forming surface, and the end of the second mold core away from the first mold core is attached to the first forming surface, so that both the outer mold part and the inner mold part can be peeled off without damage during demolding.

[0007] Furthermore, the first movable part includes a first movable block adapted to the number and position of the flange lugs of the assembly flange and a second movable block adapted to the number and position of the first protruding mark plate on the assembly flange. A first mounting groove and a second mounting groove are formed on the third cavity, respectively for the first and second movable blocks to be assembled therein. The sides of the first and second mounting grooves near the first cavity communicate with the first cavity. The sides of the first and second movable blocks facing the middle mold, together with the front mold, form the first cavity; the sides away from the first or second mounting groove, together with the front mold, form the third cavity. This allows the entire front mold to be peeled away horizontally from the middle mold while forming part of the centrifugal pump body structure. The centrifugal pump body does not affect the flange lug of the assembly flange, and the first movable block where the flange lug is located can be demolded by peeling it off along the radial direction or other directions of the assembly flange; a first inner post is formed on the side of the first mounting groove away from the first cavity facing the first cavity, which is adapted to the bolt hole of the flange lug; a first fitting groove is formed on the side of the first movable block facing the third cavity, which is adapted to the outer contour surface of the flange lug; the first inner post is located in the first fitting groove and one end is attached to the first movable block; demolding of the flange lug can be completed by moving the first movable block away from the front mold; a second fitting groove is formed between the second mounting groove and the side of the second movable block facing the third cavity, which is adapted to the outer contour surface of the first sign, for forming the first sign on the assembly flange.

[0008] Furthermore, the second movable part includes a plurality of third movable blocks that are sequentially distributed around the fourth cavity. A third mounting groove in the shape of an annular shape is recessed along the circumference of the fourth cavity near the second cavity for each third movable block to be assembled therein. The side of the third mounting groove near the second cavity is connected to the second cavity. The side of each third movable block facing the first cavity and the middle mold together form the second cavity, and the inner side of each third movable block and the middle mold together form the fourth cavity. This makes it easy to separately set up and set up a plurality of parts between the volute flow channel and the inlet flange that are difficult to demold by horizontal movement. While not affecting the demolding of the middle mold and the front mold, it also greatly reduces the demolding difficulty between each third movable block, and at the same time completes the forming of the outer contour surface of the volute flow channel and the inlet flange.

[0009] Furthermore, the thickness of each of the third movable blocks is different on the side facing the front mold and the side away from the front mold. The depth of the third mounting groove at the position of each third movable block is adapted to each third movable block, so that each third movable block can be aligned and positioned on the middle mold more quickly during assembly, and each third movable block can be operated separately during demolding.

[0010] Furthermore, the third movable block is configured as at least three pieces, one of which is located at the bottom center of the second cavity. The third movable block located at the bottom center includes a first module segment adapted to part of the vortex flow channel and inlet pipe, and a second module segment extending towards the bottom. The third mounting groove extends towards the bottom of the middle mold from the position of the third movable block at the bottom and is sequentially formed with a first groove segment for the first module segment to be assembled therein and a second groove segment for the second module segment to extend therein at intervals and penetrate the bottom of the middle mold. The side of the first module segment and the second module segment facing the rear mold is attached to the third mounting groove, and the side of the second module segment facing forward is attached to the third mounting groove. One side of the side mold is flush with the side of the middle mold facing the front side mold; on the opposite side of the front side mold and the middle mold, two fourth mounting grooves are formed in half, which are respectively for the two ends of the two third movable parts to be assembled therein and are connected to the second groove segment. Between the second mold segment and the second groove segment, and at the position of the front side mold directly opposite the second groove segment, a second forming surface that is adapted to the outer contour surface of the bottom foot is formed in half between the top surface of the two third movable parts. This facilitates the forming of the bottom foot and makes it easier to peel off the third movable block located in the center of the bottom during demolding. After the third movable block located in the center of the bottom is peeled off, the demolding of the remaining third movable blocks will also be easier.

[0011] Furthermore, a fifth mounting groove with a diameter larger than that of the inlet flange plate is formed on the side of the middle mold facing the rear mold. A protrusion that fits into the fifth mounting groove is formed on the side of the rear mold facing the fifth mounting groove. The side of the protrusion facing the fifth mounting groove is the first forming surface. A fourth shaft core that is adapted to the inner contour surface of the inlet flange and fits into the second mold core is formed on the center of the first forming surface facing the middle mold. A second protruding post that is adapted to the bolt hole of the inlet flange is formed on the first forming surface facing the fifth mounting groove, so as to form the inner and outer contour surfaces of the inlet flange with the middle mold relative to the inner mold part.

[0012] Furthermore, the middle mold includes a left side mold and a right side mold that interlock. The second cavity, the fourth cavity, and the fifth mounting groove are all formed in half on the opposite side of the left side mold and the right side mold, thereby facilitating demolding away from the centrifugal pump body along the demolding direction perpendicular to the front mold, thus avoiding damage to the centrifugal pump body. A first top module is formed on the top surface of the front mold by dividing the first cavity at the position corresponding to the outlet flange plate. The side of the first top module facing the front mold together with the front mold forms the first cavity. Two second top modules are formed on the top surfaces of the left side mold and the right side mold by dividing the second cavity at the position corresponding to the outlet flange plate. The side of the two second top modules facing the middle mold together with the left side mold and the right side mold forms the second cavity. A third protrusion adapted to the bolt holes of the outlet flange is provided on the first top module and the second top module respectively to facilitate the demolding of the outlet flange plate.

[0013] Furthermore, the first mold core includes a first shaft core and a plurality of first bushings sequentially connected around the outer wall of the first shaft core, which are adapted to the inner contour surface of the assembly flange. The extension is formed on the end of the first shaft core facing the third cavity. The maximum length of any one of the first bushings is less than the inner diameter of the assembly flange. The ends of the first shaft core and each first bushing away from the second mold core are all attached to the third cavity, so that each first bushing and the first shaft core can be removed from the port of the assembly flange without damaging the centrifugal pump body during demolding. The second mold core includes a second shaft core coaxially distributed with the first shaft core and a plurality of first bushings sequentially connected around the outer wall of the second shaft core, which are adapted to the inner contour surface of the volute. The inner contour surface of the flow channel is fitted with several second bushings, the maximum length of any one of the second bushings being less than the inner diameter of the inlet flange. The two ends of the second shaft core are respectively attached to the first shaft core and the first forming surface, so that each second shaft core and second bushing can be removed from the pipe opening of the assembly flange or inlet flange without damaging the centrifugal pump body during demolding. The third mold core includes a third shaft core that is fitted with the inner contour surface of the outlet flange. One end of the third shaft core near the second bushing is attached to the second bushing, and the other end protrudes from the first top module and the second top module, so that it can be removed from the pipe opening of the outlet flange. This completes the setting of all the inner mold parts, and the whole is demolded.

[0014] Furthermore, each of the second bushings is sequentially divided into a first rib block near the first cavity and a second rib block near the second cavity along the circumferential direction of the second shaft core. The side of each first rib block and second rib block that is in contact with each other is a dividing surface. The dividing surfaces are sequentially connected and inclined relative to the radial direction of the second shaft core to form a draft angle, which facilitates demolding.

[0015] The horizontal centrifugal pump body mold of the present invention has at least the following beneficial effects: By setting up an outer mold section composed of multiple parts, along with the cooperation of the first, second, and third movable parts, the outer contour surface of the centrifugal pump body is formed. During demolding, the parts can be separated into sections, especially for areas where movement in any direction between the flanges and the volute flow channel is difficult to achieve demolding. The first, second, and third movable parts allow these difficult-to-demold sections to be formed and demolded separately, reducing demolding difficulty while ensuring the integrity of the entire centrifugal pump body's outer contour surface. The first, second, and third mold cores work together to form the inner contour surface of the centrifugal pump body. Simultaneously, the inner mold is divided into multiple parts, each used to form different structures of the centrifugal pump, facilitating both inner mold processing and separate demolding. The entire mold design solves the demolding difficulty problem while forming the centrifugal pump body. Furthermore, the mold structure is reusable, allowing for the manufacture of several centrifugal pump bodies of the same model, significantly reducing costs. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the formed horizontal centrifugal pump body; Figure 2 This is a schematic diagram of the invention. Figure 3 This is an exploded view of the present invention; Figure 4 This is a top view of the present invention; Figure 5 for Figure 4 A cross-sectional view along direction AA as shown; Figure 6 for Figure 4 A cross-sectional view along the BB direction shown; Figure 7 This is a schematic diagram of the assembly of the front mold and the first movable part of the present invention; Figure 8 This is a schematic diagram of the assembly of the middle mold and the second movable part of the present invention; Figure 9 This is a structural schematic diagram of the middle mold of the present invention from another angle; Figure 10 This is a schematic diagram of the structure of the second movable part of the present invention; Figure 11 This is an exploded view of the second active part of the present invention; Figure 12 This is a schematic diagram of the structure of the inner mold portion of the present invention; Figure 13This is an exploded view of the inner mold portion of the present invention. The meanings of the labels in the attached diagram are as follows: Scroll casing flow channel-11; Assembly flange-12; Flange lug-121; Inlet flange-13; Inlet flange plate-131; Inlet pipe section-132; Outlet flange-14; Outlet pipe section-141; Outlet flange plate-142; First flange-1421; Foot-15; Outer mold section -2; Front side mold -21; First cavity -211; Third cavity -212; First top module -213; Third forming surface -2131; First through hole -2132; First inner pillar -214; First positioning groove -215; Middle mold -22; Second cavity -221; Fourth cavity -222; Left side mold -223; Right side mold -224; Second top module -225; Fourth forming surface -2251; Second through hole -2252; Third mounting groove -226; First groove segment -2261; Second groove segment -2262; Fourth mounting groove -227; First positioning block -228; Fifth mounting block -229; 2291; 2292; 23; 23; 231; 232; 233; 234; 235; 236; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 24; 25; 25; 25; 25; 25; 25; 251; 2511; 2512; 2513; 26; 26; 26; 26; 26; 26; 26; 26; 26; 27; 29; Inner mold section -3; First mold core -31; First shaft core -311; First bushing -312; Extension section -311a; Second mold core -32; Second shaft core -321; Plum blossom sleeve -3211; Inner shaft -3212; Trapezoidal block -3213; Second bushing -322; Trapezoidal groove -3221; First rib block -3222; Second rib block -3223; Third mold core -33; Third shaft core -331; End plate -332; Injection port -4. Detailed Implementation

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] like Figure 1As shown, the horizontal centrifugal pump body includes a volute flow channel 11 with an internal volute-shaped cavity, an assembly flange 12 coaxially distributed with the volute flow channel 11 and located on one side of the volute flow channel 11, an inlet flange 13 coaxially distributed with the volute flow channel 11 and located on the other side of the volute flow channel 11, an outlet flange 14 connected at one end to the top side of the volute flow channel 11, and two base feet 15 located at the bottom of the volute flow channel 11 in a mirror or symmetrical arrangement. The assembly flange 12 includes an assembly port and an assembly pipe section. Several flange ears 121 are provided on the outer pipe wall of the assembly pipe section near the assembly port. The flange ears 121 have bolt holes for easy assembly. The inlet flange 13 includes an inlet flange plate 131 and an inlet pipe section 132. The inlet flange plate 131 also has several bolt holes. The outlet flange 14 includes an outlet flange plate 142 and an outlet pipe section 141. Both the assembly pipe section and the inlet pipe section 132 are cylindrical. The shape of the outlet flange 14, together with the inner cavity of the volute flow channel 11, forms a volute-shaped cavity. Therefore, the inner cavity of the outlet pipe section 141 has a curved, funnel-shaped structure, gradually widening from the end near the volute flow channel 11 towards the end away from the volute flow channel 11. Bolt holes are also present on the outlet flange plate 142. The assembly flange 12, the volute flow channel 11, and the inlet flange 13 are concentrically and sequentially connected. Four first ribs, gradually widening from the volute flow channel 11 side towards the inlet flange plate 131 side, are evenly spaced around the outer wall of the inlet pipe section 132. Two of these first ribs are located at the top and bottom of the inlet pipe section 132. Second ribs are mirror-distributed on the outer wall of the outlet pipe section 141 near the assembly flange 12 and the inlet flange 13, respectively, with the second ribs vertically aligned with the central axis of the assembly flange 12. A first concave portion is formed on the side of the volute flow channel 11 facing the inlet flange 13, extending inwards around the inlet pipe section 132 towards the side away from the inlet flange 13. A first marker and a second marker are respectively installed at the center of the outer wall on one side of the assembly pipe section and the volute flow channel 11.

[0019] like Figures 2 to 13 As shown, the horizontal centrifugal pump body mold of the present invention includes an outer mold part 2 and an inner mold part 3. The outer mold part 2 has a molding cavity for molding the outer contour surface of the horizontal centrifugal pump body, and the inner mold part 3 is located in the molding cavity and is used to mold the inner contour surface of the horizontal centrifugal pump body. A sluice gate 4 communicating with the molding cavity is formed on the outer mold part 2. After the assembly between the outer mold part 2 and the inner mold part 3 is completed and a sealing connection is achieved using an auxiliary adhesive, liquid material is injected into the molding cavity through the sluice gate 4 until it is full. After cooling and molding, the pump body is demolded. After the excess part on the molded horizontal centrifugal pump body is cut off and polished, a horizontal centrifugal pump body with accurate dimensions and relatively complete shape can be obtained.

[0020] like Figure 3As shown, the outer mold part 2 includes a front mold 21, a middle mold 22, a rear mold 23 that are sequentially interlocked, and a first movable part 24 that is adapted to a portion of the outer contour surface of the assembly flange 12, a second movable part 25 that is adapted to the outer contour surface of a first recess between the volute flow channel 11 and the inlet flange 13, and two third movable parts 26 that are adapted to a portion of the outer contour surface of the two base feet 15, so that the entire outer mold part 2 is formed by multiple parts interlocking with each other, namely the front mold 21, the middle mold 22, the rear mold 23, the first movable part 24, the second movable part 25, the third movable part 26, the fourth movable part 26, the fifth movable part 26, the sixth movable part 26, the seventh movable part 27, the eleventh movable part 28, the eleventh movable part 29, the eleventh movable part 20, the eleventh movable part 21, the eleventh movable part 22, the eleventh movable part 23, the eleventh movable part 24, the eleventh movable part 25, the eleventh movable part 26, the eleventh ... The two movable parts 25 and the third movable part 26 together enclose the molding cavity. The injection port 4 can be formed on any one of the front mold 21, the middle mold 22 and the rear mold 23 and connects the molding cavity and the outside of the entire mold. Thus, the entire outer mold part 2 is composed of the front mold 21, the middle mold 22 and the rear mold 23 as the main structure for molding the outer contour surface structure of the horizontal centrifugal pump body. For some structures of the horizontal centrifugal pump body, such as the first inner recess and the flange lug 121 of the assembly flange 12, the assembly pipe section and the inlet pipe section are connected. When demolding, parts such as 132 cannot be peeled off by simple lateral movement or simple vertical movement. Therefore, by setting the first movable part 24, the second movable part 25, and the third movable part 26, the flange lug 121 and the first inner recess on the horizontal centrifugal pump, such as the mounting flange 12, can be formed separately. During demolding, the parts that make the mold difficult to demold can be separated from the outer mold part 2 for separate demolding, thereby greatly reducing the demolding difficulty. The first movable part 24, the second movable part 25, and the third movable part 26 can be peeled off from the formed horizontal centrifugal pump body respectively. Their volume is smaller than the front mold 21, the middle mold 22, and the rear mold 23, and smaller than the volume of the horizontal centrifugal pump body. Therefore, it is easy to demold in a suitable direction without damaging the outer surface of the horizontal centrifugal pump body, thereby realizing the demolding of the outer mold part 2. At the same time, each outer mold part 2 can be reused, and the size and structure of the formed horizontal centrifugal pump body obtained by reuse is guaranteed to meet the requirements. Compared with the existing manufacturing method, the cost is greatly reduced.

[0021] The front mold 21, middle mold 22, and rear mold 23 are all rectangular block structures for ease of manufacturing. The front mold 21 and middle mold 22 each have an opposing side, as do the middle mold 22 and rear mold 23. A first cavity 211 is formed on the side of the front mold 21 facing the middle mold 22, matching half the shape of the outer contour surface of the volute flow channel 11, outlet flange 14, and base 15. A second cavity 221 is formed on the side of the middle mold 22 facing the front mold 21, matching the other half of the outer contour surface of the volute flow channel 11, outlet flange 14, and base 15. The first cavity 211 and the second cavity 221 divide the outer contour structure of the entire horizontal centrifugal pump body in half, and the first cavity 211 and the second cavity 221 are connected and aligned. Since the front and rear sides of the volute flow channel 11, the outlet flange 14 and the base 15 are relatively symmetrical, the first cavity 211 and the second cavity 221 can be used to form the outer contour surface of the volute flow channel 11, the outlet flange 14 and the base 15. When demolding, the front mold 21 can be moved horizontally along the axial direction of the assembly flange 12 toward the side away from the pump body of the horizontal centrifugal pump, so that the front mold 21 can be separated from the outlet flange 14, the volute flow channel 11 and the outer contour surface it abuts.

[0022] like Figure 7 As shown, a third cavity 212 is recessed on the side of the front mold 21 facing the middle mold 22 and located on the inner wall of the first cavity 211, facing away from the middle mold 22. The third cavity 212 is coaxially distributed and connected with the position corresponding to the volute flow channel 11 of the first cavity 211, so that the front mold 21 is used to form the general outer contour surface of the volute flow channel 11, the foot 15 and the outlet flange 14, while also forming the outer contour surface of the assembly flange 12.

[0023] Since the outlet flange plate 142 has a first flange 1421 protruding in the axial direction of the outlet flange plate 142 toward the side away from the volute flow channel 11, a first top module 213 is divided on the top surface of the front mold 21 by the first cavity 211 corresponding to the position of the side of the outlet flange plate 142 away from the volute flow channel 11. The side of the first top module 213 facing the front mold 21 has a third forming surface 2131 that matches the outer contour structure of the side of the outlet flange plate 142 away from the volute flow channel 11. The third forming surface 2131 and the front mold 21 together form the first cavity 211. On the third forming surface 2131, a plurality of first through holes 2132 are formed along the axial direction of the cavity where the outlet flange plate 142 is located, toward the side away from the first cavity 211. Each first through hole 2132 corresponds to the position of the outlet flange 14. A third protrusion (not shown in the figure) is inserted into each first through hole 2132 to block the first through hole 2132 and to form the bolt hole of the outlet flange plate 142. Each third protrusion is attached to the inner wall of the first cavity 211 to form the bolt hole of the outlet flange plate 142.

[0024] However, since the assembly flange 12 has a flange lug 121, which is formed by extending and protruding relative to the assembly pipe section in its radial direction toward the side away from the assembly pipe section, the front mold 21 cannot be easily removed from the horizontal centrifugal pump body by moving forward after the horizontal centrifugal pump body is formed. Therefore, the first movable part 24 is movably disposed on the front mold 21 and located in the third cavity 212. At the same time, the first movable part 24 extends into the first cavity 211 to cooperate with the inner wall of the third cavity 212 for molding the flange lug 121. When the horizontal centrifugal pump body is molded and demolded, due to the presence of the first movable part 24, the front mold 21 can still move forward horizontally relative to the horizontal centrifugal pump body to peel off the horizontal centrifugal pump body. The first movable part 24 remains on the horizontal centrifugal pump body when the front mold 21 peels off the horizontal centrifugal pump body and completes demolding independently from the front mold 21. Afterwards, only the first movable part 24 needs to be removed separately.

[0025] The first movable part 24 includes a first movable block 241 adapted to the number and position of the flange lugs 121 of the assembly flange 12 and a second movable block 242 adapted to the number and position of the first sign protruding on the assembly flange 12. On the side wall of the third cavity 212, corresponding to the position of each flange lug 121, a first mounting groove is formed in the radial direction of the position of the third cavity 212 for each first movable block 241 to be assembled therein. On the side wall of the third cavity 212, corresponding to the position of the first sign, a second mounting groove is formed in the radial direction of the position of the third cavity 212 for the second movable block 242 to be assembled therein. The first and second mounting slots are both open on the side closest to the first cavity 211 to connect with the first cavity 211. The first and second mounting slots are horizontally formed relative to the first cavity 211 along the axial direction of the third cavity 212, away from the middle mold 22. Thus, the first movable block 241 and the second movable block 242 can both move relative to the first and second mounting slots along an axial direction parallel to the third cavity 212. The side of the first movable block 241 and the second movable block 242 facing the middle mold 22, together with the front mold 21, forms the first cavity 211.

[0026] On the side of the first mounting groove away from the first cavity 211, a first inner post 214 is formed protruding towards the first cavity 211 along the axial direction parallel to the third cavity 212, which is adapted to the bolt hole of the flange lug 121. On the side of the first movable block 241 facing the third cavity 212, a first adapter groove 243 is formed that connects to the side of the first mounting groove where the first inner post 214 is located, and is adapted to the outer contour surface of the flange lug 121. The first inner post 214 is located in the first adapter groove 243 and its end facing the third cavity 212 is attached to the first movable block 241, so that the first adapter groove 243, the first inner post 214 and the first mounting groove are used together to form the flange lug 121. When peeling off the front mold 21, the front mold 21 is moved horizontally in the axial direction parallel to the assembly flange 12 toward the side away from the assembly flange 12 (i.e., forward). During the peeling off of the front mold 21, the first movable block 241 gradually detaches from the front mold 21 from the side of the first mounting groove facing the opening of the first cavity 211 until it is completely detached. The demolding of the front mold 21 becomes relatively simple and easy. After the front mold 21 is completely detached, the first movable block 241 is peeled off in the radial direction of the assembly flange 12 toward the side away from the assembly flange 12 to completely demold the assembly flange 12. The peeling off of the first movable block 241 is also relatively simple and easy and will not damage the pump body of the horizontal centrifugal pump. The second movable block 242 has a recessed cavity structure on its entire side facing the third cavity 212, radially away from the third cavity 212, with a shape and structure consistent with the shape and structure of the first sign. A second fitting groove 244, matching the outer contour surface of the first sign, is formed between the second mounting groove and the side of the second movable block 242 facing the third cavity 212, for molding the first sign. The demolding method of the second movable block 242 is the same as that of the first movable block 241, and will not be detailed here. Thus, the first movable block 241, the second movable block 242, and the front mold 21 together form the third cavity 212, facilitating demolding while molding the assembly flange 12.

[0027] Figure 8 and Figure 9As shown, a second cavity 221 is formed on the side of the middle mold 22 facing the front mold 21 for molding the outer contour surface of the other half of the volute flow channel 11, the outlet flange 14, and the base 15. When the middle mold 22 is used in conjunction with the front mold 21, it can be used to mold the outer contour surface of the volute flow channel 11, the outlet flange 14, and the base 15. During demolding, the middle mold 22 can be moved along the axial direction parallel to the assembly flange 12 toward the side away from the volute flow channel 11 to peel the middle mold 22 off the pump body of the horizontal centrifugal pump. Preferably, a fourth cavity 222 is recessed on the side of the middle mold 22 facing the rear mold 23, opposite the second cavity 221, and is consistent with the shape and structure of the outer contour surface of the inlet flange 13 to be adapted to the second cavity 221. The fourth cavity 222 is coaxially distributed with the third cavity 212 so that the middle mold 22 can also be used to mold the outer contour surface structure of the inlet flange 13. However, since the diameter of the inlet flange plate 131 is much larger than the diameter of the inlet pipe section 132, it is obviously impossible to continue peeling the intermediate mold 22 along the axial direction parallel to the assembly flange 12. Therefore, as a preferred embodiment, the intermediate mold 22 includes a left mold 223 and a right mold 224 that are split in half and interlocked along the axial direction perpendicular to the assembly flange. The second cavity 221 and the fourth cavity 222 are both formed in half along the central axis of the inlet flange 13 on the opposite side of the left mold 223 and the right mold 224, and the side of the second cavity 221 on the left mold 223 and the right mold 224 that faces the front mold 21 is open. In this way, during demolding, the left mold 223 and the right mold 224 are open. 24 can move horizontally along the axial direction perpendicular to the inlet flange 13 toward the side away from the inlet flange 13 to peel off the outer contour surface of the horizontal centrifugal pump body. At the same time, since the front mold 21 and the middle mold 22 are half-formed volute flow channel 11, outlet flange 14 and base 15, the demolding of the left mold 223 and the right mold 224 do not affect each other and are independent of each other, so that the demolding of the inlet flange 13 can be completed smoothly. Moreover, the demolding process of the entire middle mold 22 is relatively easy and the operation is simple and convenient.

[0028] Similarly, to facilitate the demolding of the first flange 1421, the top surfaces of the left mold 223 and the right mold 224 are divided by the second cavity 221 at the position corresponding to the side of the outlet flange plate 142 away from the volute flow channel 11 to respectively divide the second top module 225. The side of the second top module 225 facing the left mold 223 and the right mold 224 has a fourth forming surface 2251 that is consistent with the outer contour structure of the side of the outlet flange plate 142 away from the volute flow channel 11 to be adapted. The fourth forming surface 2251, the left mold 223 and the right mold 224 together form the second cavity 221. On the fourth forming surface 2251, a plurality of second through holes 2252 are formed along the axial direction of the cavity where the outlet flange plate 142 is located, toward the side away from the first cavity 211. Each second through hole 2252 is arranged in a ring with the first through hole 2132 and corresponds to the position of the outlet flange 14. At each second through hole 2252, a third protrusion (not shown in the figure) is also inserted to block the second through hole 2252 and to form the bolt hole of the outlet flange plate 142. The third protrusions on each fourth forming surface 2251 are all attached to the inner wall of the second cavity 221 to form the bolt hole of the outlet flange plate 142.

[0029] Since the vortex flow channel 11 has a first concave portion on the side facing the inlet flange 13, and the first concave portion is distributed in a ring around the inlet flange 13, it is difficult for the left mold 223 and the right mold 224 to move horizontally in the axial direction perpendicular to the inlet flange 13 without damaging the pump body of the horizontal centrifugal pump. Therefore, the second movable part 25 is movably disposed on the left mold 223 and the right mold 224 and located in the second cavity 221 or the fourth cavity 222, so as to cooperate with the inner wall of the second cavity 221 to form the first concave part alone. When the horizontal centrifugal pump body is formed and demolded, due to the presence of the second movable part 25, the left mold 223 and the right mold 224 can still move horizontally relative to the horizontal centrifugal pump body in a direction perpendicular to the inlet flange 13 to peel off the horizontal centrifugal pump body and achieve peeling. The second movable part 25 remains on the horizontal centrifugal pump body when the left mold 223 and the right mold 224 peel off the horizontal centrifugal pump body and completes demolding independently from the left mold 223 and the right mold 224. Then, only the second movable part 25 needs to be removed.

[0030] like Figure 8 , Figure 10 and Figure 11As shown, the second movable part 25 includes a plurality of third movable blocks 251 sequentially abutting against each other around the fourth cavity 222. A ring-shaped third mounting groove 226 is recessed along the circumference of the fourth cavity 222 near the second cavity 221, allowing the third movable blocks 251 to be assembled therein. The third mounting groove 226 is open on the side near the second cavity 221 to communicate with the second cavity 221. The third mounting groove 226 is horizontally formed relative to the second cavity 221 along the axial direction of the fourth cavity 222 towards the side near the front mold 21. The third movable blocks 251 are formed both in the second cavity 221 and in the fourth cavity 222. Thus, each of the third movable blocks 251 can move relative to the third mounting groove 226 in an axial direction parallel to the fourth cavity 222, thereby facilitating demolding. The side of each third movable block 251 facing the first cavity 211, together with the left mold 223 and the right mold 224, forms the second cavity 221. The inner side of each third movable block 251 (i.e. the side of each third movable block 251 facing inward along the radial direction parallel to the fourth cavity 222) together with the left mold 223 and the right mold 224 forms the fourth cavity 222. This allows the left mold 223 and right mold 224 to move horizontally in opposite directions and peel off the horizontal centrifugal pump body during the molding and demolding process. During the peeling process of the left mold 223 and right mold 224, each third movable block 251 gradually detaches from the left mold 223 and right mold 224, so that the left mold 223 and right mold 224 are independent of the third movable blocks 251 and do not interfere with each other during the demolding process. After the left mold 223 and right mold 224 have been demolded, the third movable block 251 is peeled off separately. At this time, the third movable block 251 can be moved in the axial direction parallel to the inlet flange 13 away from the horizontal centrifugal pump body, so that the demolding of the entire middle mold 22 can be completed without damaging the outer contour surface of the horizontal centrifugal pump body. The demolding process is simple and convenient.

[0031] In this invention, the third movable block 251 is configured as at least three pieces; in this embodiment, three third movable blocks 251 are configured. Preferably, the thickness of each third movable block 251 from the side facing the front mold 21 to the side away from the front mold 21 (i.e., the length or spacing of the third movable block 251 along the direction parallel to the axial direction of the inlet flange 13 from the side facing the front mold 21 to the side facing the rear mold 23) is different. The depth of the third mounting groove 226 at the position of each third movable block 251 is adapted to each third movable block 251 so that each third movable block 251 is fitted within the third mounting groove 226, thereby ensuring that... The side of the third movable block 251 facing the front mold 21, together with the middle mold 22, forms the second cavity 221. The inner sides of each third movable block 251, together with the middle mold 22, form the fourth cavity 222. The different thicknesses of the third movable blocks 251 facilitate quick alignment of the installation positions of the third movable blocks 251 and the third mounting groove 226 during mold assembly. At the same time, the different thicknesses of the third movable blocks 251 also facilitate mutual force and differentiation between the third movable blocks 251 during demolding, thus facilitating demolding.

[0032] One of the third movable blocks 251 is located at the bottom center of the second cavity 221, while the other two third movable blocks 251 are respectively set on the left mold 223 and the right mold 224. The third movable block 251 located at the bottom is set in half in the third mounting groove 226 corresponding to the left mold 223 and the right mold 224 to facilitate assembly and demolding. It should be noted that since one end of the outlet pipe section 141 is connected to the vortex flow channel 11, and the inner cavity of the vortex flow channel 11 and the inner cavity of the outlet pipe section 141 together form a vortex-shaped cavity, a second concave portion is formed between the first concave portion near the outlet pipe section 141 and the end of the outlet pipe section 141 near the vortex flow channel 11. One third movable block 251 is set on the left mold 223 and corresponds to the second concave portion, while the side of the third movable block 251 on the left mold 223 facing the front mold 21 is the same as the vortex. The contour surfaces of the first recess and the entire second recess on the side of the shell flow channel 11 away from the front mold 21 are consistent and adapted to each other; the last third movable block 251 is provided on the right mold 224, the top ends of the two third movable blocks 251 on the left mold 223 and the right mold 224 are attached to each other, and the bottom ends of the two third movable blocks 251 on the left mold 223 and the right mold 224 are respectively attached to the two sides of the third movable block 251 located at the bottom center position facing the left mold 223 and the right mold 224, and are sequentially distributed and connected. Preferably, the third movable block 251 located at the bottom center includes a first module segment 2511 adapted to part of the vortex flow channel 11 and the inlet pipe section 132, and a second module segment 2512 extending towards the bottom; while the third mounting grooves 226 on the left mold 223 and the right mold 224 are opened towards the bottom at the position of the third movable block 251 located at the bottom, and are formed from top to bottom in a first groove segment 2261 for the first module segment 2511 to be assembled therein and a groove segment 2261 for the second module segment 2512 to be assembled therein. The second groove segment 2262 extends into and through the bottom of the middle mold 22 at intervals 2512. The side of the first mold segment 2511 and the second mold segment 2512 facing the rear mold 23 are respectively half-fitted to the third mounting groove 226 on the left mold 223 and the right mold 224. The side of the second mold segment 2512 facing the front mold 21 is flush with the side of the left mold 223 and the right mold 224 facing the front mold 21 so that it can fit against the front mold 21 when the front mold 21 and the middle mold 22 are fastened together.Two fourth mounting slots 227 are formed on the side of the front mold 21 facing the middle mold 22 for assembling half of the third movable part 26 therein. Similarly, fourth mounting slots 227 are formed on the side of the left mold 223 and the right mold 224 facing the front mold 21 for assembling the other half of the third movable part 26 therein. One of the fourth mounting slots 227 on the front mold 21 is directly opposite to the fourth mounting slot 227 on the left mold 223 and is distributed in half. The other fourth mounting slot 227 on the front mold 21 is directly opposite to the fourth mounting slot 227 on the right mold 224 and is distributed in half, so that the third movable part 26 is assembled on the front mold 21 and the rear mold 23 respectively. In this embodiment, the third movable block 251, located at the center of the bottom, is situated between the fourth mounting groove 227 on the left mold 223 and the fourth mounting groove 227 on the right mold 224. The second segment 2262 of the third mounting groove 226 connects to the two fourth mounting grooves 227 on the middle mold 22. The two sides of the second segment 2512 facing the left mold 223 and the right mold 224 are spaced apart from the second segment 2262 and open near the top. The gap between the second segment 2512 and the third mounting groove 226 is aligned with the outer contour surface of the end of the base 15 connected to the volute flow channel 11 for adaptation. The end of the second segment 2512 away from the first segment 2511 is attached to the two third movable parts 26 along the distribution direction of the left mold 223 and the right mold 224. Both third movable parts 26 include a fourth movable block 261 assembled in the fourth mounting groove 227. The end of the fourth movable block 261 away from the middle mold 22 extends outward horizontally to form a limiting edge 262 that is larger than the fourth mounting groove 227 and cannot be inserted into the fourth mounting groove 227. When the fourth movable block 261 is assembled in the fourth mounting groove 227 and the limiting edge 262 is attached to the left mold 223 and the right mold 224, the side of the fourth movable block 261 facing the second mold segment 2512 is attached to the second mold segment 2512, the side of the fourth movable block 261 facing the rear mold 23 is attached to the side of the fourth mounting groove 227 facing the rear mold 23, and the side of the fourth movable block 261 facing outward along the direction perpendicular to the axis of the inlet flange 13 is attached to the side of the fourth mounting groove 227 facing it. Between the top surface of the fourth movable block 261 and the top surface of the fourth mounting groove 227, there is a fifth molding surface that matches the bottom outer contour surface of the base 15. The front mold 21, at the position opposite the second groove segment 2262, is provided with a second molding surface 27 that matches the outer contour surface of the base 15, which is divided in half between the top surfaces of the two third movable parts 26. The second molding surface 27, the fifth molding surface, the gap between the second mold segment 2512 and the second groove segment 2262 are used to form the outer contour surface of the base 15.Since the inner sides of the two bases 15 form an isosceles trapezoidal structure, it will not affect the peeling when the front mold 21 is demolded. The third movable block 251 located in the center of the bottom has an isosceles trapezoidal shape because the orientation of its side facing the left mold 223 and the right mold 224 is adapted to the bases 15. Therefore, the third movable block 251 located in the center of the bottom will not cause any obstruction when the left mold 223 and the right mold 224 are demolded. Preferably, a groove is formed on the bottom surface of the third movable block 251 located at the center of the bottom, facing upwards. A horizontal bar 2513 is provided in the groove to facilitate the application of force to the third movable block 251 at the bottom during demolding. The cooperation of the groove and the horizontal bar 2513 makes it easier for external auxiliary tools to act on the third movable block 251 located at the center of the bottom. Before the horizontal centrifugal pump body is peeled off from the front mold 21 and the rear mold 23, the easily operable third movable block 251 at the bottom can be demolded first. Then, leaving a gap between the left mold 223 and the right mold 224 makes it easier to pry the front mold 21 and the right mold 224, providing a force point for the smooth and opposing sides of the left mold 223 and the right mold 224, making demolding easier. The molding cavity corresponding to the second sign is formed on the left mold 223 and is recessed relative to the second cavity 221 towards the side away from the right mold 224.

[0033] Preferably, on the left mold 223 and right mold 224 of the middle mold 22, symmetrical first positioning blocks 228 are horizontally protruding towards the front mold 21 on their respective sides. The top and bottom surfaces of the first positioning blocks 228 are inclined towards the front mold 21 from the side closer to the rear mold 23, so that the entire first positioning block 228 has a trapezoidal structure. The two first positioning blocks 228 are respectively located on the left and right sides of the second cavity 221. At the position of the front mold 21 directly opposite the two first positioning blocks 228, first positioning grooves 215 are respectively opened to mate with the two first positioning blocks 228. During mold assembly, the first positioning grooves 215 and the two first positioning blocks 228 can be aligned until the first positioning blocks 228 are engaged with the two first positioning grooves 215, thereby quickly aligning the front mold 21 and the middle mold 22 and avoiding the impact on the integrity and accuracy of the molding cavity due to misalignment of the front mold 21 and the middle mold 22.

[0034] like Figure 9As shown, a fifth mounting groove 2291 with a diameter larger than that of the inlet flange plate 131 is formed on the side of the middle mold 22 facing the rear mold 23. A protrusion 231 is formed on the side of the rear mold 23 facing the fifth mounting groove 2291, and is fitted into the fifth mounting groove 2291. The groove depth of the fifth mounting groove 2291 is equal to the thickness of the protrusion 231 and the diameters are equal to achieve fitting. On the side of the protrusion 231 facing the fifth mounting groove 2291 and facing the fourth cavity 222, a first forming surface 232 is formed on the side facing the fourth cavity 222, which is consistent in shape and size with the outer contour surface of the side of the inlet flange plate 131 facing away from the volute flow channel 11 to be adapted. The end of the second mold core 32 away from the first mold core 31 is attached to the first forming surface 232 to form the inner contour surface that runs through both ends of the horizontal centrifugal pump body. Therefore, a fourth shaft core 235 is formed extending from the center of the first forming surface 232 toward the middle mold 22, which is adapted to the inner contour surface of the inlet flange 13 and fits against the second mold core 32. A second protruding post 233 is formed on the first forming surface 232 toward the fifth mounting groove 2291, which is adapted to the bolt hole of the inlet flange 13. During assembly, the entire protrusion 231 is inserted into the fifth mounting groove 2291 until the first forming surface 232 fits against the inner wall of the fifth mounting groove 2291 near the second cavity 221, thus completing the installation of the middle mold 22 and the rear side mold 23. The fifth mounting groove 2291 is formed in half on the opposite side of the left mold 223 and the right mold 224 and connects to the second cavity 221 along the axial direction of the third cavity 212. The first forming surface 232, the left mold 223 and the right mold 224 together form a fourth cavity 222 with the same outer contour surface as the inlet flange 13. The fourth shaft core 235 is attached to the second shaft core 321.

[0035] Preferably, at least two second positioning blocks 234 are horizontally protruding from the side of the rear mold 23 facing the middle mold 22, and the shape and structure of the second positioning blocks 234 may be the same as or different from the first positioning block 228. In this embodiment, four second positioning blocks 234 are provided and distributed at the four corners of the right mold 224, with the protrusions 231 located between each of the second positioning blocks 234. On the facing sides of any two adjacent second positioning blocks 234, a guide slope is formed, tilting away from the rear mold 23 side towards the middle mold 22 side. On the sides of the left mold 223 and right mold 224 of the middle mold 22 facing the rear mold 23, corresponding to each second positioning block 234, a second positioning groove 2292 is recessed to engage with the second positioning block 234. The guide slope facilitates guidance and allows the second positioning blocks 234 and the second positioning groove 2292 to cooperate, enabling rapid alignment and assembly between the middle mold 22 and the right mold 224, ensuring the integrity and dimensional accuracy of the fourth cavity 222. It should be noted that aligned pin holes 29 can be sequentially formed along the axial direction of the third cavity 212 on the front mold 21, middle mold 22, and rear mold 23. During mold assembly, pins that engage with the pin holes 29 are used to further align and connect the front mold 21, middle mold 22, and rear mold 23.

[0036] like Figure 3 , Figure 5 , Figure 6 , Figure 12 and Figure 13 As shown, the inner mold part 3 includes a first mold core 31 disposed in the molding cavity and adapted to the inner contour surface of the assembly flange 12, a second mold core 32 tightly fitted on the first mold core 31 and adapted to the inner contour surface of the volute flow channel 11 and the inlet flange 13, and a third mold core 33 disposed in the molding cavity and with one end attached to the second mold core 32 and adapted to the inner contour surface of the outlet flange 14. The ends of the first mold core 31, the second mold core 32 and the third mold core 33 that are far apart from each other extend in opposite directions and are attached to the inner wall of the molding cavity. The first mold core 31, the second mold core 32 and the third mold core 33 are respectively disposed in the molding cavity. In the first cavity 211, second cavity 221, third cavity 212 and fourth cavity 222 between the front mold 21 and the middle mold 22, the end of the first mold core 31 away from the second mold core 32 is attached to the side of the third cavity 212 away from the first molding surface 232, and the end of the second mold core 32 away from the first mold core 31 is attached to the third shaft core 331 on the first molding surface 232. In this way, the entire inner mold part 3 is divided into multiple parts and assembled on the outer mold part 2, so that the appropriate direction can be selected for demolding during demolding, and the inner mold part 3 is not difficult to demold due to the inner contour surface of the molded horizontal centrifugal pump body.

[0037] The first mold core 31 includes a cylindrical first shaft core 311 and a plurality of first bushings 312, which are sequentially connected around the outer side wall of the first shaft core 311 and are identical in shape and size to the inner contour surface of the assembly flange 12 for matching. The inner side of each first bushing 312 is tightly fitted to the outer wall of the first shaft core 311. In the content defined in this embodiment, at least three first bushings 312 are provided, such that the maximum length of any one first bushing 312 is less than the inner diameter of the assembly flange 12. For example, the first bushings 312 are divided into four, and the top and bottom two first bushings 312 are symmetrical, and the left and right first bushings 312 are symmetrically distributed, so that when the entire first bushing 312 needs to be demolded, it can be peeled off the inner wall of the assembly flange 12 in sections. Since the length of each first bushing 312 is less than the opening of the assembly flange 12, each first bushing 312 can be removed without damaging the assembly flange 12 during demolding. The ends of the first shaft core 311 and each of the first bushings 312 away from the second mold core 32 are attached to the third cavity 212 to form the opening of the assembly flange 12. Preferably, the injection port 4 is opened on the front mold 21 along the radial direction of the third cavity 212, and the injection port 4 intersects the third cavity 212. The ends of the first shaft core 311 and the first bushings 312 away from the middle mold 22 extend horizontally towards the side away from the middle mold 22 to form an extension section 311a with a diameter equal to the opening of the assembly flange 12. On the side of the third cavity 212 away from the first cavity 211, an extension groove is recessed towards the side away from the first cavity 211 to form an extension groove that fits with the extension section 311a. The injection port 4 connects the extension groove and the third cavity 212 and intersects with the extension section 311a of the first shaft core 311. On the outer wall of each first bushing 312 away from the extension section 311a, a forming section is formed to fit the inner contour surface of the assembly flange 12, thereby forming the inner contour surface of the assembly flange 12. Thus, when the molten material enters the assembled forming cavity through the injection port 4 and fills it, the injection port 4 is also filled and connected to the extension section 311a of the first shaft core 311 after forming, thereby facilitating the extraction of the first shaft core 311 through the formed body of the injection port 4, reducing the difficulty of demolding.

[0038] The second mold core 32 includes a second shaft core 321 coaxially distributed with the first shaft core 311 and a plurality of second bushings 322 connected sequentially around the outer wall of the second shaft core 321, which are identical in shape and size to the inner contour surface of the volute flow channel. In this embodiment, the second bushings 322 are set to at least three pieces, and the maximum length of any second bushing 322 is less than the inner diameter of the inlet flange 13, thereby reducing the difficulty during demolding. In this embodiment, the second bushing 322 of the entire second mold core 32 is divided in half along the axial direction. The half of the second bushing 322 away from the outlet flange 14 is further divided into two pieces, while the half of the second bushing 322 near the outlet flange 14 is divided into three pieces. Specifically, a portion corresponding to the second concave portion is divided into a separate piece, a portion located in the middle is divided into a second piece along the horizontal direction, and a portion located at the bottom is divided into a third piece, thus dividing the entire second bushing 322 into five pieces. This ensures that the second bushing 322 can be removed without being too small. During demolding, the second piece of the second bushing 322 located in the middle on the side near the outlet flange 14 can be peeled off along the horizontal direction, and then the other second bushings 322 can be peeled off in sequence.

[0039] Preferably, the second shaft core 321 includes a cylindrical inner shaft 3212 and a plum blossom sleeve 3211 fitted and tightly fitted onto the inner shaft 3212. Each second shaft sleeve 322 is sequentially wound around and attached to the plum blossom sleeve 3211. At the position of the plum blossom sleeve 3211 opposite to each second shaft sleeve 322, a trapezoidal block 3213 is provided along the axial direction of the inner shaft 3212. On the inner side surface of each second shaft sleeve 322, a trapezoidal groove 3221 is provided, which slides and engages with the trapezoidal block 3213 in a direction parallel to the axial direction of the inner shaft 3212. In this way, when each second shaft sleeve 322 is bonded to the plum blossom sleeve 3211, the cooperation between the trapezoidal block 3213 and the trapezoidal groove 3221 can prevent the second shaft sleeve 322 from loosening between the second shaft core 321 to a certain extent, thereby reducing the assembly difficulty of the inner mold part 3 and saving time for mold assembly. One end of the inner shaft 3212 facing the first shaft core 311 is attached to the first shaft core 311, and the other end of the inner shaft 3212 extends toward the first forming surface 232 and is attached to the end of the protrusion 231 away from the rear mold 23. The diameter of the inner shaft 3212 and the diameter of the protrusion 231 are both equal to the inner diameter of the inlet pipe section 132 and are coaxial, so that the formed horizontal centrifugal pump body can form a three-end through cavity after the entire mold is assembled. It should be noted that a slot can also be opened on the side of the plum blossom sleeve 3211 facing the rear mold 23, so that the end of the inner shaft 3212 facing the plum blossom sleeve 3211 extends toward the slot and is inserted into it to achieve positioning between the plum blossom sleeve 3211 and the inner shaft 3212.

[0040] Preferably, each second bushing 322 is sequentially divided along the circumferential direction of the second shaft core 321 to divide each second bushing 322 into a first rib block 3222 near the first cavity 211 and a second rib block 3223 near the second cavity 221. The side of each first rib block 3222 and second rib block 3223 that is in contact with each other is the dividing surface. Each dividing surface is sequentially connected and is inclined relative to the radial direction of the second shaft core 321. Each dividing surface is flush with each other to form a draft angle, thereby further facilitating the peeling of each second bushing 322 from the inner wall of the volute flow channel 11 during demolding.

[0041] The third mold core 33 includes a third shaft core 331 adapted to the inner contour surface of the outlet flange 14. One end of the third shaft core 331 near the second bushing 322 is attached to the second bushing 322, and the other end of the third shaft core 331 extends toward the first top module 213 and the second top module 225 and is consistent in shape and size with the inner contour surface of the outlet flange 14 to adapt to it. A through groove is provided in half at the end of the first top module 213 and the second top module 225 opposite to the end of the third shaft core 331 away from the second shaft core 321, and an end plate 332 is formed on the end of the third shaft core 331 away from the second shaft core 321, which is inserted into and fitted into the through groove, so as to provide a point of force for the operator during demolding and facilitate the peeling of the third shaft core 331.

[0042] The operation of one embodiment of the horizontal centrifugal pump body mold of the present invention is as follows: During assembly, the inner mold parts 3 are pre-attached. After the first movable block 241 and the second movable block 242 are sequentially assembled into the first and second mounting slots, they can be attached to the front mold 21 via the end plate 332 of the third shaft core 331. After aligning and connecting the left mold 223 and the right mold 224, the third movable block 251 is attached to the third mounting slot 226. The front mold 21 and the middle mold 22 are aligned and fastened together by the first positioning block 228 and the first positioning slot 215, thus connecting them. The first positioning block 228 and the first positioning slot 215 allow the middle mold 22 and the front mold 21 to naturally connect. Alignment, and / or alignment via pins and pin holes 29, is performed to fit the two fourth movable blocks 261 from bottom to top into the fourth mounting groove 227. The limiting edge 262 at this time limits the depth of the fourth movable blocks 261 fitting into the fourth mounting groove 227 to form the fifth molding surface. Subsequently, the rear mold 23 is aligned with the middle mold 22 and connected by the second positioning block 234 and the second positioning groove 2292. After sealing the gaps by using an auxiliary adhesive, the liquid material can be injected through the injection port 4. After the liquid material fills the entire molding cavity and the inner cavity surrounded by the inner mold part 3, it is left to cool and solidify. During demolding, the rear mold 23 can be peeled off along the axial direction parallel to the fourth cavity 222 toward the side away from the middle mold 22. Then, the first top module 213 and the second top module 225 can be peeled off sequentially along the axial direction of the outlet flange plate 142 toward the side away from the front mold 21 and the middle mold 22. After that, the two fourth movable blocks 261 and the third movable block 251 located at the bottom center can be peeled off sequentially in the opposite direction to the first top module 213 and the second top module 225. Then, the front mold 21 can be peeled off horizontally toward the front side. Finally, the demolding can be done along the vertical direction. In the horizontal direction perpendicular to the axial direction of the fourth cavity 222, the left mold 223 and the right mold 224 are peeled off in reverse order. Then, the first movable block 241, the second movable block 242 and the remaining third movable block 251 are peeled off in sequence. Finally, the first shaft core 311, the inner shaft 3212, the plum blossom sleeve 3211, the third shaft core 331, the first shaft sleeve 312 and the second shaft sleeve 322 are peeled off in sequence to achieve the purpose of demolding by non-destructive forming of the horizontal centrifugal pump body. The structure of this invention can be reused, reducing manufacturing costs.

Claims

1. A horizontal centrifugal pump body mold, characterized in that, include: The outer mold portion is composed of several interlocking parts. On the outer mold portion are movably disposed a first movable part adapted to a portion of the outer contour surface of the mounting flange, a second movable part adapted to a portion of the outer contour surface of the area between the volute flow channel and the inlet flange, and two third movable parts adapted to portions of the outer contour surfaces of the two base feet. The outer mold portion has an internal cavity that, together with the first, second, and third movable parts, forms a molding cavity adapted to the outer contour surface of the horizontal centrifugal pump body. The outer mold portion has an injection port communicating with the molding cavity. The inner mold part includes a first mold core disposed in the molding cavity and adapted to the inner contour surface of the assembly flange, a second mold core tightly fitted on the first mold core and adapted to the inner contour surface of the volute flow channel and the inlet flange, and a third mold core disposed in the molding cavity and one end attached to the second mold core and adapted to the inner contour surface of the outlet flange. The ends of the first mold core, the second mold core and the third mold core that are far away from each other extend in opposite directions and are attached to the inner wall of the molding cavity. The end of the first mold core that is far away from the second mold core continues to extend towards the end that is far away from the second mold core to form an extension section that facilitates positioning with the outer mold part. The outer mold portion includes a front mold, a middle mold, and a rear mold that are sequentially engaged. On the opposing sides of the front mold and the middle mold, a first cavity and a second cavity are respectively formed in half, which are adapted to and communicate with the outer contour surfaces of the volute flow channel, the outlet flange, and the base. On the side of the front mold facing the middle mold and located on the inner wall of the first cavity, a third cavity is recessed and formed on the side away from the middle mold, which is adapted to the outer contour surface of the assembly flange. On the side of the middle mold facing the rear mold, a fourth cavity is recessed and formed on the side facing the second cavity, which is connected to the second cavity and adapted to the outer contour surface of the inlet flange. On the side of the rear mold facing the middle mold and located on the side facing the fourth cavity, a first forming surface is formed on the side facing the fourth cavity, which is adapted to the outer contour surface of the inlet flange on the side away from the volute flow channel. The first mold core, the second mold core, and the third mold core are all disposed between the front mold and the middle mold. The end of the first mold core away from the second mold core is attached to the side of the third cavity away from the first molding surface, and the end of the second mold core away from the first mold core is attached to the first molding surface. The first mold core includes a first shaft core and a plurality of first bushings that are sequentially connected around the outer side wall of the first shaft core and are adapted to the inner contour surface of the assembly flange. The second mold core includes a second shaft core coaxially distributed with the first shaft core and a plurality of second bushings sequentially connected around the outer wall of the second shaft core and adapted to the inner contour surface of the vortex flow channel. The maximum length of any one of the second bushings is less than the inner diameter of the inlet flange. The two ends of the second shaft core are respectively attached to the first shaft core and the first forming surface. The second shaft core has multiple trapezoidal blocks, and each of the second shaft sleeves has a trapezoidal groove that is adapted to the trapezoidal blocks and slides along their axial direction.

2. The horizontal centrifugal pump body mold as described in claim 1, characterized in that: The first movable part is disposed in the third cavity, the second movable part is disposed in the second cavity, and the third movable part is disposed on the front mold and the rear mold.

3. The horizontal centrifugal pump body mold as described in claim 2, characterized in that: The first movable part includes a first movable block adapted to the number and position of the flange lugs of the assembly flange and a second movable block adapted to the number and position of the first protruding sign on the assembly flange. A first mounting groove and a second mounting groove are formed on the third cavity, respectively for the first movable block and the second movable block to be assembled therein. The side of the first mounting groove and the second mounting groove near the first cavity is connected to the first cavity. The side of the first movable block and the second movable block facing the middle mold and the front mold together form the first cavity, and the side away from the first mounting groove or the second mounting groove together with the front mold together form the third cavity. A first inner post is formed protruding from the side of the first mounting groove away from the first cavity and facing the first cavity, which is adapted to the bolt hole of the flange lug. A first adapter groove is formed recessed on the side of the first movable block facing the third cavity, which is adapted to the outer contour surface of the flange lug. The first inner post is located in the first adapter groove and one end is attached to the first movable block. A second fitting groove is formed between the second mounting groove and the side of the second movable block facing the third cavity, which is adapted to the outer contour surface of the first sign.

4. The horizontal centrifugal pump body mold as described in claim 2, characterized in that: The second movable part includes a plurality of third movable blocks that are sequentially distributed around the fourth cavity. A third mounting groove in the shape of an annular shape is provided on the inner wall of the fourth cavity near the second cavity for each third movable block to be assembled therein. The side of the third mounting groove near the second cavity is connected to the second cavity. The side of each of the third movable blocks facing the first cavity, together with the middle mold, forms the second cavity, and the inner side of each of the third movable blocks, together with the middle mold, forms the fourth cavity.

5. The horizontal centrifugal pump body mold as described in claim 4, characterized in that: The thickness of each of the third movable blocks is different on the side facing the front mold and the side away from the front mold. The depth of the third mounting groove at the position of each third movable block is adapted to each third movable block.

6. The horizontal centrifugal pump body mold as described in claim 5, characterized in that: The third movable block is configured as at least three blocks, wherein one of the third movable blocks is located at the bottom center of the second cavity. The third movable block located at the bottom center includes a first module segment adapted to part of the vortex shell flow channel and inlet pipe, and a second module segment extending towards the bottom. The third mounting groove extends towards the bottom of the middle mold from the position of the third movable block at the bottom and is formed in sequence with a first groove segment for the first mold segment to be assembled therein and a second groove segment for the second mold segment to extend therein at intervals and penetrate the bottom of the middle mold. The side of the first mold segment and the second mold segment facing the rear mold is attached to the third mounting groove, and the side of the second mold segment facing the front mold is flush with the side of the middle mold facing the front mold. On the opposing side surfaces of the front mold and the middle mold, two fourth mounting grooves are formed in half, which are respectively used to fit the two ends of the two third movable parts and are connected to the second groove segment. A second forming surface that matches the outer contour surface of the base is formed in half between the second mold segment and the second groove segment, and between the front mold and the top surface of the two third movable parts at the position opposite to the second groove segment.

7. The horizontal centrifugal pump body mold as described in claim 6, characterized in that: A fifth mounting groove with a diameter larger than that of the inlet flange plate is formed on one side of the middle mold facing the rear mold. A protrusion that fits into the fifth mounting groove is formed on the rear mold at the position directly opposite the fifth mounting groove. The side of the protrusion facing the fifth mounting groove is the first forming surface. A fourth shaft core that is adapted to the inner contour surface of the inlet flange and fits into the second mold core is formed extending from the center of the first forming surface toward the middle mold. A second protruding post that is adapted to the bolt hole of the inlet flange is formed on the first forming surface toward the fifth mounting groove.

8. The horizontal centrifugal pump body mold as described in claim 7, characterized in that: The middle mold includes a left side mold and a right side mold that interlock, and the second cavity, the fourth cavity and the fifth mounting groove are all formed in half on the opposite side of the left side mold and the right side mold; A first top module is formed on the top surface of the front mold by dividing the first cavity at the position corresponding to the outlet flange plate. The side of the first top module facing the front mold together with the front mold forms the first cavity. Two second top modules are formed on the top surfaces of the left and right molds by dividing the second cavity at the position corresponding to the outlet flange plate. The side of the two second top modules facing the middle mold, together with the left and right molds, forms the second cavity. The first and second top modules are respectively provided with third protrusions that are adapted to the bolt holes of the outlet flange.

9. The horizontal centrifugal pump body mold according to any one of claims 2 to 8, characterized in that: The extension is formed on the end of the first shaft facing the third cavity. The maximum length of any one of the first bushings is less than the inner diameter of the assembly flange. The ends of the first shaft and each first bushing away from the second mold core are all attached to the third cavity. The third mold core includes a third shaft core that is adapted to the inner contour surface of the outlet flange. One end of the third shaft core is attached to the second shaft sleeve, and the other end extends out of the first top module and the second top module.

10. The horizontal centrifugal pump body mold as described in claim 9, characterized in that: Each of the second bushings is sequentially divided into a first rib block near the first cavity and a second rib block near the second cavity along the circumferential direction of the second shaft core. The side of each first rib block and second rib block that is in contact with each other is the dividing surface. The dividing surfaces are sequentially connected and are distributed at an inclination relative to the radial direction of the second shaft core.

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