Outer circulation structure for shield pump

Abstract

The utility model discloses an external circulation structure for a shield pump, which comprises a circulation pipe, the circulation pipe comprises a first pipe, a second pipe and a third pipe which are connected in sequence, one end of the first pipe is of a threaded structure and is in threaded connection with an outlet of a pump body, and the other end of the first pipe is installed on a first flange and is communicated with a throttling hole arranged on the first flange. One end of the third pipe is of a threaded structure and is in threaded connection with an outlet of the rear end cover, the other end of the third pipe is installed on the fourth flange, the second flange and the third flange are installed at the two ends of the second pipe respectively, the first flange is connected with the second flange, a throttling hole of the first flange is communicated with the second pipe, the fourth flange is connected with the third flange, and the third pipe is communicated with the second pipe. The shield pump has the advantages of being reliable in structure, easy to disassemble, free of leakage and capable of better achieving control over the external circulation amount of the shield pump and improving the performance of the shield pump.

Description

Technical Field

[0001] The utility model relates to the technical field related to electric pumps, in particular to an external circulation structure for a shielded pump. Background Art

[0002] For the transportation of low-boiling substances and various easily vaporized media, internally pressurized shielded pumps are popular in the market because they do not require external piping. The external circulation structure commonly used at present is conventionally a threaded throttling pipe head at both ends. Although it is easy to connect and disassemble, it has poor reliability and is prone to loosening and leakage. In the petrochemical industry, most of the transport media are highly corrosive, and high requirements are placed on the reliability and leakage of shielded pumps. In addition, for some high-power pumps, the original circulation volume is insufficient and cannot meet the use requirements of polysilicon projects, so the external circulation structure needs to be modified. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide an external circulation structure for a canned pump.

[0004] The technical solution adopted by the utility model to achieve the above-mentioned purpose is:

[0005] A shielded pump external circulation structure includes a circulation pipe, the circulation pipe includes pipe 1, pipe 2, and pipe 3 connected in sequence, one end of pipe 1 is a threaded structure connected to a pump body outlet thread, the other end of pipe 1 is installed on flange 1 and is connected to a throttling hole opened on flange 1, one end of pipe 3 is a threaded structure connected to a rear end cover outlet thread, the other end of pipe 3 is installed on flange 4, flange 2 and flange 3 are installed at both ends of pipe 2 respectively, flange 1 is connected to flange 2 and the throttling hole of flange 1 is connected to pipe 2, flange 4 is connected to flange 3, and pipe 3 is connected to pipe 2.

[0006] The flange 1 is provided with a groove 1 at the connecting end, the flange 2 is provided with a boss 1 at the connecting end, the boss 1 is installed in the groove 1, the flange 4 is provided with a groove 2 at the connecting end, the flange 3 is provided with a boss 2 at the connecting end, and the boss 2 is installed in the groove 2.

[0007] The flange one is connected to the flange two by bolts, and the flange three is connected to the flange four by bolts.

[0008] The second flange and the third flange have the same structure.

[0009] The first pipe, the second pipe and the third pipe have different pipe diameters.

[0010] The utility model is characterized by reliable structure, easy disassembly and no leakage, and can better control the external circulation volume of the canned pump and improve the performance of the canned pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 It is a schematic diagram of the structure of a flange of the utility model.

[0013] Figure 3 It is a schematic diagram of the structure of flange 2 of the utility model.

[0014] Figure 4 It is a schematic diagram of the flange three structures of the utility model.

[0015] Figure 5 It is a schematic diagram of the structure of flange 4 of the utility model.

[0016] Among them: 1, pipe one 2, pipe two 3, pipe three 4, flange one 41, throttle hole 5, flange two 6, flange three 7, flange four 8, groove one 9, boss one 10, groove two 11, boss two 12, gasket one 13, gasket two 14, pump body outlet 15, rear end cover outlet. DETAILED DESCRIPTION

[0017] like Figure 1-5As shown, the utility model is an external circulation structure for a shielded pump, including a circulation pipe, the circulation pipe includes a pipe 1, a pipe 2, and a pipe 3 connected in sequence, one end of the pipe 1 is a threaded structure and is threadedly connected to the pump body outlet 14, the other end of the pipe 1 is installed on the flange 14, and is connected to the throttling hole 41 opened on the flange 4, one end of the pipe 3 is a threaded structure and is threadedly connected to the rear end cover outlet 15, the other end of the pipe 3 is installed on the flange 4 7, the pipe 1 and the pipe 3 3 are threaded integral pipes, which are easy to install, the flange 1 4 has a throttling hole 41, and there is no need to weld a throttling hole plate separately, the two ends of the pipe 2 2 are respectively installed with flange 2 5 and flange 3 6, the flange 2 5 and flange 3 6 can adopt the same structure, the flange 1 4 is connected to the flange 2 5 by bolts, and ensures that the throttling hole 41 of the flange 1 4 is connected to the pipe 2 2, the flange 4 7 is connected to the flange 3 6 by bolts, and ensures that the pipe 3 3 is connected to the pipe 2 2, the Flange 1 4, flange 2 5, flange 3 6 and flange 4 7 are also connected by a concave-convex structure, that is, flange 1 4 is provided with a groove 18 at the connecting end, and a sealing gasket 12 is installed in the groove 8; flange 2 5 is provided with a boss 9 at the connecting end, and the boss 9 is installed in the groove 8; flange 4 7 is provided with a groove 2 10 at the connecting end, and a sealing gasket 2 13 is installed in the groove 2 10; flange 3 6 is provided with a boss 2 11 at the connecting end, and the boss 2 11 is installed in the groove 2 10; the corresponding grooves and boss positions are interchangeable; by adopting the concave-convex structure, the stability and sealing of the flange connection can be increased; the concave and convex surfaces correspond to each other, and the two flange surfaces fit more closely when connected, which can compensate for the eccentricity and imbalance problems in the flange connection, and can effectively disperse the stress on the connecting surface, the flange is not easy to fall off, and the sealing gasket is placed in the groove, so the sealing gasket is not easy to be squeezed out, the seal is tighter, and it is not easy to leak.

[0018] During installation before the test, the threads of pipe 1 and pipe 2 are tightened at the pump body outlet 14 and the rear end cover outlet 15 respectively. A throttling hole 41 is pre-drilled on flange 14 for different motors. After the final size of the throttling hole "d" is determined through a water test, pipe 1 and flange 4 are welded, and then pipe 2 and pipe 1 1 and pipe 3 3 are flange-connected. Pipe 1 can be disassembled multiple times to adjust the size of the throttling hole 41. In addition, circulation pipes of different diameters can be used for pipe 1, pipe 2 and pipe 3 to adjust the medium flow rate and reduce pipeline losses.

[0019] The utility model aims to retain the easy installation performance of the original threaded external circulation, while better preventing leakage, regulating the circulation volume and making it easier to throttle.

[0020] The utility model replaces the original threaded external circulation with a flange connection, and the flange is integrated with a throttling hole. The overall structure is more reliable, easy to disassemble, and leak-free. At the same time, it can better control the external circulation volume of the shielded pump and improve the performance of the shielded pump.

[0021] The above description is only a preferred specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical scheme and inventive concept of the present utility model within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present utility model.

Claims

1. An external circulation structure for a canned motor pump, comprising a circulation pipe, characterized in that: The circulation pipe includes pipe one, pipe two, and pipe three which are connected in sequence. One end of pipe one is a threaded structure connected to the pump body outlet thread. The other end of pipe one is installed on flange one and is connected to the throttling hole opened on flange one. One end of pipe three is a threaded structure connected to the rear end cover outlet thread. The other end of pipe three is installed on flange four. Flange two and flange three are respectively installed at both ends of pipe two. Flange one is connected to flange two and the throttling hole of flange one is connected to pipe two. Flange four is connected to flange three, and pipe three is connected to pipe two.

2. The external circulation structure for a canned motor pump according to claim 1, characterized in that: The flange 1 is provided with a groove 1 at the connecting end, the flange 2 is provided with a boss 1 at the connecting end, the boss 1 is installed in the groove 1, the flange 4 is provided with a groove 2 at the connecting end, the flange 3 is provided with a boss 2 at the connecting end, and the boss 2 is installed in the groove 2.

3. The external circulation structure for a canned motor pump according to claim 1, characterized in that: The flange one is connected to the flange two by bolts, and the flange three is connected to the flange four by bolts.

4. The external circulation structure for a canned motor pump according to claim 1, characterized in that: The second flange and the third flange have the same structure.

5. The external circulation structure for a canned motor pump according to claim 1, characterized in that: The first pipe, the second pipe and the third pipe have different pipe diameters.

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