Pump body of canned motor pump

Abstract

A pump body of a canned motor pump, said pump body comprising a body (1) having a cavity at the interior, as well as multiple connecting tube assemblies (2), the body (1) and each connecting tube assembly (2) being formed by means of stretching, and each connecting tube assembly (2) being fixed on the body (1) and communicating with the inner cavity of the body (1); and further comprising an inner housing (11), which is formed by injection molding and has a flow channel, the inner housing (11) being detachably mounted in the cavity of the body (1). The difficulty of manufacturing said pump body of a canned motor pump is reduced, and the yield and production efficiency of the pump body are increased.

Description

A shielded pump body Technical Field

[0001] The utility model belongs to the technical field of water pumps and relates to a shielded pump body. Background Art

[0002] The pump body is an indispensable part of the shielded pump. It mainly carries the motor, impeller and other components. At the same time, inlet and outlet pipes for material input and output are set on the connection port of the pump body. In addition, in order to ensure the liquid transportation efficiency, several flow channels are generally opened on the inner wall of the pump body to achieve the purpose of ensuring the transportation efficiency.

[0003] However, the existing shielded pump body has major defects. Specifically, the pump body is generally made of stainless steel and is formed in one piece by casting. The overall casting process takes a long time, and the flow channels formed on the inner wall of the pump body often do not meet production standards. At the same time, after the molten metal is injected into the mold cavity and cooled, there are very likely to be several small pits on the formed pump body (caused by bubbles in the liquid metal), resulting in low production efficiency and low yield. Summary of the Invention

[0004] The purpose of this utility model is to solve the above problems in the existing technology and propose a shielded pump body. The technical problem to be solved by this utility model is: how to reduce the manufacturing difficulty and improve the pump body yield and production efficiency.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a shielded pump body, including a main body with a cavity inside and a plurality of connecting pipe assemblies, characterized in that the main body and each of the connecting pipe assemblies are respectively formed by stretching, and each of the connecting pipe assemblies is fixed on the main body and connected to the cavity inside the main body. The shielded pump body also includes an inner shell formed by injection molding and having a flow channel, and the inner shell can be removed in the cavity of the main body.

[0006] The pump body of the shielded pump includes a main body and a number of connecting pipe assemblies. The main body and the several connecting pipe assemblies are respectively formed by stretching, and then the connecting pipe assemblies are fixed to the main body by solid connection. At the same time, an inner shell with a flow channel is formed by injection molding, and the inner shell is detachably installed in the cavity of the pump body. This can avoid the defects of the casting main body in the prior art, such as long production cycle and low processing precision for forming the flow channel, and can also avoid the defect that the main body cannot form the flow channel by stretching molding. This reduces the manufacturing difficulty of the pump body, saves the time and cost required for production, improves production efficiency, and at the same time improves processing precision to ensure the yield of the pump body.

[0007] In the above-mentioned shielded pump body, each set of connecting pipe assemblies includes a pipe body and a connecting joint. One end of the pipe body is fixedly connected to the connecting port of the body, and the other end is fixedly connected to the connecting joint.

[0008] Each set of connecting pipe assemblies includes a pipe body and a connecting joint. As mentioned above, both are formed by stretching and are separately set after being manufactured. Under the premise of ensuring the manufacturing yield and efficiency, during the subsequent installation process, one end of the pipe body is connected to the connection port of the main body by fixed connection (specifically welding), and the other end of the pipe body is also connected to the connecting joint by fixed connection (specifically welding). Therefore, under the premise of ensuring the manufacturing yield and efficiency, it is also possible to ensure that the connection stability between the connecting pipe assembly and the main body reaches the original level.

[0009] In the above-mentioned shielded pump body, a connecting groove is opened along the circumferential direction at one end of the tube body, and a limiting groove is opened along the circumferential direction at the other end. One end of the tube body is abutted against the inner wall of the connecting port of the main body through the connecting groove wall, and the other end is abutted against the inner wall of the connecting joint through the limiting groove wall.

[0010] The two ends of the tube body are recessed inward along the circumferential direction, so that a limiting groove is formed at one end and a connecting groove is formed at the other end. Before performing the welding step, the assembler can clamp the groove wall of the connecting groove with the inner wall of the connecting port on the main body, and clamp the groove wall of the limiting groove with the inner wall of the connecting joint, so that the three can be clamped and positioned before welding and fixing, which plays a certain role in maintaining the position of the tube body and the connecting joint, and avoids the position of the tube body or the connecting joint from being offset during the welding work, causing the formed pump body to fail to meet the manufacturing standards.

[0011] In the above-mentioned shielded pump body, an annular raised portion is provided on the inner wall of the connecting joint, and the raised portion abuts against the end of the tube body.

[0012] At the same time, an annular protrusion is integrally formed on the inner wall of the connecting joint. During the docking process of the tube body and the connecting joint, while the tube body is limited by the limiting groove wall and the inner wall of the connecting joint, the protrusion can also be abutted against the end of the tube body, thereby performing secondary fixation on the connecting joint and the tube body, thereby ensuring the positioning accuracy between the two and avoiding displacement of the positions of the two during the welding process.

[0013] In the above-mentioned shielded pump body, the inner shell is embedded in the cavity of the main body, and a plurality of reinforcing ribs are arranged on the outer wall of the inner shell at intervals along the circumferential direction.

[0014] The inner shell is directly embedded in the cavity of the main body by embedding, so as to ensure the convenience of installation of the inner shell. At the same time, the inner shell is pressed into the shell by the impeller, motor and other components subsequently installed in the main body, thereby ensuring the stability of the inner shell. In addition, a number of reinforcing ribs are arranged at intervals along the outer wall of the inner shell, thereby further improving the structural stability of the inner shell and ensuring its service life.

[0015] Compared with the existing technology, the canned motor pump body has the following advantages:

[0016] 1. The canned motor pump body includes a main body, several connecting pipe assemblies and an inner shell. The main body and the several connecting pipe assemblies are formed by stretching and welded after forming. The inner shell is formed by injection molding and embedded in the cavity of the main body, avoiding the defects of long production cycle and low processing precision of one-piece casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of the canned motor pump body.

[0018] FIG2 is a cross-sectional view of the pump body of the canned motor pump.

[0019] FIG3 is a schematic diagram of the structure of the main body.

[0020] FIG4 is a schematic structural diagram of the connecting pipe assembly.

[0021] FIG5 is a schematic structural diagram of the inner shell.

[0022] In the figure, 1, main body; 11, inner shell; 111, reinforcing rib; 2, connecting pipe assembly; 21, pipe body; 211, connecting groove; 212, limiting groove; 22, connecting joint; 221, protrusion. Implementation Method

[0023] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0024] As shown in Figures 1-5, the shielded pump body includes a main body 1 with a cavity inside. Two connection ports for material inlet and outlet are opened on the outer wall of the main body 1. The shielded pump body also includes two groups of connecting pipe assemblies 2 and an inner shell 11 with a flow channel. Each group of connecting pipe assemblies 2 specifically includes a tube body 21 and a connecting joint 22. Each connecting pipe assembly 2 and the main body 1 are stretched and formed by stainless steel material, and the inner shell 11 is formed by plastic injection molding.

[0025] As shown in Figure 4, one end of each tube body 21 is recessed inward along the circumferential direction to form a connecting groove 211, and the other end is recessed inward along the circumferential direction to form a limiting groove 212. An annular protrusion 221 is integrally formed on the inner wall of the connecting joint 22. As shown in Figures 1 and 5, the flow channel is located on the inner wall of the inner shell 11, and a plurality of reinforcing ribs 111 are arranged on the outer wall of the flow channel at intervals along the circumferential direction.

[0026] Assembly principle: The main body 1 and each connecting pipe assembly 2 are respectively stretched and formed, and the inner shell 11 is injection molded. The assembler docks one end of the tube body 21 with the connecting port of the pump body, and the groove wall of the connecting groove 211 and the inner wall of the connecting port are abutted and limited, and then the two are fixed by welding. Then, the other end of the tube body 21 is docked with the connecting joint 22, and the limiting groove 212 and the inner wall of the connecting joint 22 are abutted and limited. At the same time, the raised portion 221 inside the connecting joint 22 is abutted against the end portion of the tube body 21, and then the two are fixed by welding. Thereafter, the inner shell 11 is directly embedded in the cavity of the pump body so that its outer wall abuts against the inner wall of the main body 1 to complete the installation of the pump body.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0028] Although this document frequently uses terms such as the body 1, inner shell 11, reinforcing rib 111, connecting pipe assembly 2, pipe body 21, connecting groove 211, limiting groove 212, connecting joint 22, and protruding portion 221, other terms may be used. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A canned pump body, comprising a body (1) having a cavity inside and a plurality of connecting pipe assemblies (2), characterized in that: The main body (1) and each of the connecting pipe assemblies (2) are formed by stretching, and each of the connecting pipe assemblies (2) is fixed on the main body (1) and communicates with the inner cavity of the main body (1). The pump body of the shielded pump also includes an inner shell (11) formed by injection molding and having a flow channel. The inner shell (11) can be removed from the cavity of the main body (1).

2. The canned motor pump body according to claim 1, characterized in that: Each group of connecting pipe assemblies (2) comprises a pipe body (21) and a connecting joint (22); one end of the pipe body (21) is fixedly connected to the connecting port of the main body (1), and the other end is fixedly connected to the connecting joint (22).

3. The canned motor pump body according to claim 2, characterized in that: One end of the tube body (21) is provided with a connection groove (211) along the circumferential direction, and the other end is provided with a limit groove (212) along the circumferential direction; one end of the tube body (21) abuts against the inner wall of the connection port of the body (1) through the groove wall of the connection groove (211), and the other end abuts against the inner wall of the connection joint (22) through the groove wall of the limit groove (212).

4. The canned motor pump body according to claim 2 or 3, characterized in that: The inner wall of the connecting joint (22) is provided with an annular protrusion (221), and the protrusion (221) abuts against the end of the tube body (21).

5. The canned motor pump body according to any one of claims 1 to 3, characterized in that: The inner shell (11) is embedded in the cavity of the main body (1), and a plurality of reinforcing ribs (111) are arranged at intervals along the circumferential direction on the outer wall of the inner shell (11).

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