Novel stator cavity pressing tool for shield pump

Abstract

The utility model discloses a novel stator cavity pressing tool for a shield pump, which comprises an L-shaped stand for placing a stator assembly, an air duct is arranged in the L-shaped stand, an inlet of the air duct is communicated with an aerostatic press, and an outlet of the air duct is connected with a pressure detection meter; rubber sealing gaskets are installed on the bottom face and the side face of the L-shaped stand correspondingly, connectors communicating with the ventilation pipeline are formed in the rubber sealing gaskets correspondingly, and pressing type pistons are installed at the connectors correspondingly; and a fastening device for fastening the stator assembly is mounted on the L-shaped stand. The device is characterized in that a routine withstand voltage test can be carried out on the stator assembly, and the stator assembly is not damaged; the operation is simple, bolt assembly and disassembly are not needed, and the labor cost and the time cost of the test are greatly reduced; stator assemblies of different models can be covered, the universality is high, and a large amount of cost is saved; the number can be expanded, and the ventilation pipelines are connected in parallel, so that a plurality of stator assemblies can be subjected to voltage withstanding tests at the same time, and the labor cost and the time cost are saved.

Description

Technical Field

[0001] This utility model relates to the technical field of shielded electric pumps, specifically to a novel stator cavity pressure testing tool for shielded pumps. Background Technology

[0002] Compared to ordinary centrifugal pumps, canned motor pumps have the advantage of leak-free transmission of the medium. A crucial structural element ensuring this leak-free operation is the shielding sleeve structure between the stator and rotor. Therefore, it is essential to ensure that the shielding sleeve structure is not damaged during inspection. This means that pressurizing the stator cavity alone is not permissible, as this would create a pressure difference across the shielding sleeve and damage it. Furthermore, based on explosion-proof standards and factory quality control requirements, the stator assembly of each canned motor pump must be inspected during assembly. Figure 6 All stator components undergo pressure tests to ensure that, in the event of an explosion caused by a faulty coil inside the stator cavity igniting the explosive gas in an explosive gas environment, the outer casing can withstand the explosion pressure, thus ensuring the safety of the equipment and personnel. Therefore, pressure testing of the stator assembly needs to be a routine inspection of all components within the factory. However, stator assemblies vary in size, and simply using bolts to tighten flanges for pressure testing is not only labor-intensive but also lacks versatility in flange compatibility. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned shortcomings and provide a new type of stator cavity pressurization tool for shielded pumps that can not damage the shielding sleeve, simplify the operation process, be highly efficient, and have strong versatility, so as to save manpower, material resources, and costs to the greatest extent.

[0004] The technical solution adopted by this utility model to achieve the above objectives is as follows:

[0005] A novel stator cavity pressurization fixture for a shielded pump includes an L-shaped frame for placing the stator assembly. The L-shaped frame contains a ventilation pipe with its inlet connected to a pneumatic compressor and its outlet connected to a pressure gauge. Rubber sealing gaskets are installed on the bottom and sides of the L-shaped frame, each with an interface connecting to the ventilation pipe, and a press-type piston is installed at each interface. A fastening device for securing the stator assembly is also installed on the L-shaped frame.

[0006] The fastening device includes a transverse fastening device and a longitudinal fastening device. The transverse fastening device includes a transverse fastener, one end of which is fitted with a transverse rubber pad and corresponds transversely to the side of the L-shaped frame. The other end of the transverse fastener is mounted on a transverse screw, which is threadedly connected to a transverse rotating wheel. The transverse rotating wheel is mounted on the bottom surface of the L-shaped frame via a transverse support frame. The longitudinal fastening device includes a longitudinal fastener, one end of which is fitted with a longitudinal rubber pad and corresponds longitudinally to the bottom surface of the L-shaped frame. The other end of the longitudinal fastener is mounted on a longitudinal screw, which is threadedly connected to a longitudinal rotating wheel. The longitudinal rotating wheel is mounted on a longitudinal support frame, which is laterally slidably mounted on a slide rail. The slide rail is mounted on the side of the L-shaped frame.

[0007] The air compressor is connected to the air supply pipe via a pressure-resistant hose.

[0008] The air compressor uses compressed, bottled nitrogen.

[0009] The rubber sealing gaskets on the bottom and sides of the L-shaped frame each have two interfaces.

[0010] The features of this utility model are: it can perform routine pressure tests on the stator assembly of a canned motor pump without damaging the stator assembly; it is simple to operate and does not require bolt installation or removal, greatly reducing the labor and time costs of testing; it can cover various models of stator assemblies, has strong versatility, and saves a lot of costs; it can be expanded in number by connecting the ventilation pipes in parallel, thereby enabling the stator assemblies of multiple canned motor pumps to be pressure tested simultaneously, saving labor and time costs. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the L-shaped frame structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the longitudinal fastening device structure of this utility model.

[0014] Figure 4 This is a schematic diagram of the longitudinal fastener structure of this utility model.

[0015] Figure 5 This is a schematic diagram of the utility model in use.

[0016] Figure 6 This is a schematic diagram of the stator assembly structure.

[0017] Among them: 1. L-shaped frame 11. Bottom surface 12. Side surface 13. Groove 2. Ventilation pipe 3. Air compressor 31. Pressure-resistant hose 4. Pressure gauge 5. Rubber sealing gasket 6. Press-type piston 7. Horizontal fastening device 71. Horizontal fastener 72. Horizontal rubber pad 73. Horizontal screw 74. Horizontal rotating wheel 75. Horizontal support frame 8. Longitudinal fastening device 81. Longitudinal fastener 82. Longitudinal rubber pad 83. Longitudinal screw 84. Longitudinal rotating wheel 85. Longitudinal support frame 86. Slide rail 9. Stator assembly 91. Wiring port 92. Wiring cavity 93. Upper outlet 94. Lower outlet 95. Outlet cavity. Detailed Implementation

[0018] like Figure 1-5As shown, this utility model is a novel stator cavity pressure testing fixture for a shielded pump, including an L-shaped frame 1 for placing the stator assembly 9. The L-shaped frame 1 is made of 304 stainless steel. An air duct 2 is provided inside the L-shaped frame 1, passing through the side 12 and bottom 11 of the L-shaped frame 1. The inlet of the air duct 2 is connected to a pressure compressor 3 via a pressure-resistant hose 31. The pressure compressor 3 uses compressed nitrogen and is placed in a pre-reserved groove 13 in the L-shaped frame 1. The outlet of the air duct 2 is connected to a pressure gauge 4, which is a measured standard pointer pressure gauge. Rubber sealing gaskets 5 are adhered to both the bottom 11 and side 12 of the L-shaped frame 1. Made of nitrile rubber, it has good wear resistance and sealing performance. Each rubber sealing gasket 5 has two interfaces communicating with the vent pipe 2. By setting multiple interfaces, it can meet the use of different models of stator assemblies 9. Each interface of the rubber sealing gasket 5 is welded with a press-type piston 6, which can be pressed to open and close the interface of the rubber sealing gasket 5. The L-shaped frame 1 is equipped with a fastening device for fastening the stator assembly 9. The fastening device includes a transverse fastening device 7 and a longitudinal fastening device 8. The transverse fastening device 7 includes a transverse fastener 71. One end of the transverse fastener 71 is equipped with a transverse rubber gasket 72, which corresponds transversely to the side 12 of the L-shaped frame 1. The other end of the transverse fastener 71 is equipped with... A transverse screw 73 is threadedly connected to a transverse rotating wheel 74. The transverse rotating wheel 74 is mounted on the bottom surface 11 of the L-shaped frame 1 via a transverse support frame 75. Rotating the transverse rotating wheel 74 drives the transverse screw 73 to move laterally, thereby driving the transverse fastener 71 to move laterally, achieving transverse fastening of the stator assembly 9, and clamping and sealing the end face of the terminal 91 of the stator assembly 9 onto the rubber sealing gasket 5 on the side 12 of the L-shaped frame 1. The longitudinal fastening device 8 includes a longitudinal fastener 81. One end of the longitudinal fastener 81 is fitted with a longitudinal rubber gasket 82 and longitudinally corresponds to the bottom surface 11 of the L-shaped frame 1. The other end of the longitudinal fastener 81 is mounted on the longitudinal screw 83. A longitudinal rotating wheel 84 is threaded onto a longitudinal support frame 85. The longitudinal support frame 85 is laterally slidably mounted on a slide rail 86. The slide rail 86 is mounted on the side 12 of the L-shaped frame 1. The slide rail 86 enables the lateral movement of the longitudinal fastener 81, making the longitudinal fastener 81 longitudinally correspond to the stator assembly 9. By rotating the longitudinal rotating wheel 84, the longitudinal screw 83 is driven to move longitudinally, thereby driving the longitudinal fastener 81 to move longitudinally, achieving longitudinal fastening of the stator assembly 9. This ensures that the end face of the lower outlet 94 of the stator assembly 9 is clamped and sealed on the rubber sealing gasket 5 on the bottom surface 11 of the L-shaped frame 1, and the end face of the upper outlet 93 of the stator assembly 9 is clamped and sealed on the longitudinal rubber gasket 82.

[0019] During the stator cavity pressure test, firstly, based on the size of the stator assembly 9 being tested, select one suitable interface each from the bottom surface 11 and side surface 12 of the L-shaped frame 1. Press the press-type piston 6 of this interface to make it conductive. Then, place the stator assembly 9 on the bottom surface 11 of the L-shaped frame 1, aligning the lower outlet 94 of the stator assembly with the interface of the rubber sealing gasket 5 on the bottom surface 11, and connect it to the ventilation pipe 2 through the corresponding press-type piston 6. Align the wiring port 91 of the stator assembly with the interface of the rubber sealing gasket 5 on the side surface 11, and connect it to the ventilation pipe 2 through the corresponding press-type piston 6. Then, by rotating the transverse roller 74, move the transverse fastener 71 toward the stator assembly 9 to transversely tighten the stator assembly 9. By moving the longitudinal fastener 81 laterally on the slide rail 86, align the longitudinal fastener 81 with the center positions of the upper outlet 93 and lower outlet 94 of the stator assembly 9 below. Rotate the longitudinal wheel 84 to move the longitudinal fastener 81 toward the stator assembly 9, thus longitudinally fastening the stator assembly 9. After the stator assembly 9 is fastened, the wiring cavity 92 and the outlet cavity 95 of the stator assembly 9 are sealed, and the wiring cavity 92 and the outlet cavity 95 are connected through the vent pipe 2. Open the valve of the compressed nitrogen tank and pressurize through the vent pipe 2. Check the seals of each interface and weld of the stator assembly 9 with soapy water. After confirming that the seals are intact, continue to pressurize to the required test pressure. Then close the valve of the compressed nitrogen tank and check the pressure value through the pressure gauge 4. Check the stator assembly 9 for leakage and deformation at this pressure value and maintain it for a certain period of time. If the stator assembly 9 is intact, the test is passed. Then release the air pressure through the interface of the pressure gauge 4, loosen the longitudinal fastening device 8 and the transverse fastening device 7 in sequence, and take back the stator assembly 9.

[0020] This invention can perform routine pressure tests on the stator assembly 9 of a canned motor pump without damaging it; it is simple to operate and requires no bolt installation or removal, significantly reducing the labor and time costs of testing; it can cover various models of stator assemblies 9, has strong versatility, and saves a lot of costs; the number of this invention can be expanded by connecting the ventilation pipes 2 in parallel, thereby enabling multiple canned motor pump stator assemblies 9 to undergo pressure tests simultaneously, saving labor and time costs.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel stator cavity pressure testing fixture for a canned motor pump, characterized in that: The device includes an L-shaped frame for placing the stator assembly, an air duct inside the L-shaped frame, an inlet connected to a pneumatic compressor, and an outlet connected to a pressure gauge; rubber sealing gaskets are installed on the bottom and sides of the L-shaped frame, each rubber sealing gasket having an interface connected to the air duct, and a press-type piston is installed at each interface; a fastening device for securing the stator assembly is installed on the L-shaped frame.

2. The novel stator cavity pressure testing fixture for a canned pump as described in claim 1, characterized in that: The fastening device includes a transverse fastening device and a longitudinal fastening device. The transverse fastening device includes a transverse fastener, one end of which is fitted with a transverse rubber pad and corresponds transversely to the side of the L-shaped frame. The other end of the transverse fastener is mounted on a transverse screw, which is threadedly connected to a transverse rotating wheel. The transverse rotating wheel is mounted on the bottom surface of the L-shaped frame via a transverse support frame. The longitudinal fastening device includes a longitudinal fastener, one end of which is fitted with a longitudinal rubber pad and corresponds longitudinally to the bottom surface of the L-shaped frame. The other end of the longitudinal fastener is mounted on a longitudinal screw, which is threadedly connected to a longitudinal rotating wheel. The longitudinal rotating wheel is mounted on a longitudinal support frame, which is laterally slidably mounted on a slide rail. The slide rail is mounted on the side of the L-shaped frame.

3. The novel stator cavity pressure testing fixture for a canned pump as described in claim 1, characterized in that: The air compressor is connected to the air supply pipe via a pressure-resistant hose.

4. The novel stator cavity pressure testing fixture for a canned pump as described in claim 1, characterized in that: The air compressor uses compressed, bottled nitrogen.

5. The novel stator cavity pressure testing fixture for a canned pump as described in claim 1, characterized in that: The rubber sealing gaskets on the bottom and sides of the L-shaped frame each have two interfaces.

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