Canned Motor Pump Model and Canned Motor Pump Pre-installation Simulation Method

Abstract

The present invention relates to a canned pump model, comprising: an idler part; a main flange part; a motor part; a lower bearing part; and a main shaft, wherein: the idler part, the main flange part, the motor part, and the lower bearing part are sequentially arranged along the main shaft to form a cylindrical stepped structure. The present invention also relates to a canned pump pre-installation simulation method, comprising the steps of: using the above-mentioned canned pump model to test: the matching of the canned pump transport tooling or trolley with the canned pump, or the matching of the canned pump transport installation channel with the canned pump. The method may also include the steps of: changing or selecting the structure or structural parameters of the canned pump transport tooling based on the test results; or the structure or structural parameters of the canned pump transport installation channel.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of nuclear power plant design and manufacturing, and in particular to a canned motor pump model and a canned motor pump pre-installation simulation method using the model. Background Art

[0002] At present, before the installation of a third-generation nuclear power canned pump, due to the lack of a verification tool that is similar to the canned pump's outline, it is impossible to verify the feasibility of the canned pump's transportation channel and installation verification. Therefore, during the actual transportation and installation of the canned pump, the channel was blocked, affecting the actual installation work.

[0003] In addition, due to the lack of corresponding verification tools, in the design of the shielded pump transportation channel, it is impossible to conduct actual verification of the transportation and installation channel in advance, resulting in the inability to discover design problems in advance and the design documents cannot be upgraded and improved accordingly.

[0004] Moreover, during the secondary transportation of the canned pump, due to the lack of corresponding simulation verification tools for preliminary test verification, the matching problem between the transport tooling and the canned pump cannot be discovered and improved in time during the actual secondary transportation of the canned pump, which has an adverse impact on the actual transportation of the canned pump.

[0005] In addition, before the canned motor pump was officially installed, due to the lack of corresponding simulation installation practice tools for pre-installation practice, the workers did not fully grasp the installation technical difficulty of this type of new pump, which affected the actual installation work.

[0006] Due to the lack of corresponding simulation verification equipment, the practical matching problems between the shielded pump installation cart and the shielded pump cannot be discovered and improved in advance, resulting in the shielded pump and the cart not being well matched during the actual installation operation of the shielded pump, affecting the installation work. Summary of the invention

[0007] The present invention is proposed to alleviate or solve at least one of the above problems.

[0008] A canned motor pump model, comprising:

[0009] Idler gear part;

[0010] Main flange;

[0011] Motor Department;

[0012] a lower bearing portion; and

[0013] Spindle,

[0014] in:

[0015] The idler wheel part, the main flange part, the motor part, and the lower bearing part are sequentially arranged along the main shaft to form a cylindrical stepped structure. Optionally, at least one of the idler wheel part, the main flange part, the motor part, and the lower bearing part is a hollow cylinder with a cavity formed inside.

[0016] Optionally, the shielded pump model also includes: an impeller portion; and an outlet portion, wherein: the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion are sequentially arranged along the main shaft to form a cylindrical stepped structure.

[0017] Optionally, at least one of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion is a hollow cylinder with a cavity formed inside. Further optionally, the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion are all hollow cylinders with a cavity formed inside.

[0018] Optionally, the outer peripheral surface of the motor part is not provided with a flange part for stator cooling.

[0019] Optionally, the shielded pump model further includes an end flange portion, which is disposed below the lower bearing portion; the end flange portion and the lower bearing portion are formed as a whole to form a single cylindrical structure.

[0020] Optionally, a pipe flange portion is disposed on the outer circumference of at least one of the idler portion and the lower bearing portion. Further optionally, a measurement pipe portion is disposed on the outer circumference of at least one of the idler portion and the lower bearing portion.

[0021] Optionally, the main shaft is a stepped main shaft, or the main shaft is a main shaft with a constant outer diameter.

[0022] Further optionally, the main shaft is a stepped main shaft and has a large diameter portion, a first shaft neck portion, a second shaft neck portion and a third shaft neck portion located above the large diameter portion and connected to the large diameter portion in sequence, and a fourth shaft neck portion and a fifth shaft neck portion located below the large diameter portion and connected to the large diameter portion in sequence; and the main flange portion is arranged on the large diameter portion, the upper portion of the impeller portion and the outlet portion is arranged on the third shaft neck portion, the lower portion of the outlet portion and the idler portion are respectively arranged on the second shaft neck portion and the first shaft neck portion, and the motor portion and the lower bearing portion are respectively arranged on the fourth shaft neck portion and the fifth shaft neck portion. Furthermore, the outer diameters of the first shaft neck portion, the second shaft neck portion and the third shaft neck portion decrease in sequence; the outer diameter of the fourth shaft neck portion is greater than the outer diameter of the fifth shaft neck portion.

[0023] Optionally, the cross-section of the main shaft is generally circular; and a keyway fitting structure is provided between the corresponding portion of the main shaft and at least one end face or inner wall surface of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion.

[0024] Alternatively, the cross-section of the main shaft is polygonal; and a corresponding portion of the main shaft has a profile fitting structure with at least one end face or inner wall surface of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion.

[0025] Optionally, the upper surface of the idler wheel portion is provided with a boss suitable for cooperating with the pump casing.

[0026] The embodiment of the present invention further provides a canned motor pump pre-installation simulation method, comprising the steps of:

[0027] Utilize the canned pump model test described above to test: the compatibility of the canned pump transport tooling or trolley with the canned pump, or the compatibility of the canned pump transport installation channel with the canned pump.

[0028] Optionally, the method further includes the steps of: changing or selecting the structure or structural parameters of the shielded pump transport tooling based on the test results; or the structure or structural parameters of the shielded pump transport installation channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A three-dimensional schematic diagram of a canned motor pump model according to an exemplary embodiment of the present invention;

[0030] Figure 2 for Figure 1 A schematic side view of the canned motor pump model in FIG.

[0031] Figure 3 for Figure 1 Schematic diagram of the main axis in;

[0032] Figure 4 for Figure 1 Schematic diagram of the main flange in FIG.

[0033] Figure 5 for Figure 1 Schematic diagram of the motor part;

[0034] Figure 6 for Figure 1 Schematic diagram of the lower bearing part and the end flange part;

[0035] Figure 7 for Figure 1 A schematic diagram of the idler wheel portion;

[0036] Figure 8 for Figure 1 Schematic diagram of the outlet portion;

[0037] Fig. 9 for Figure 1 Schematic diagram of the impeller part. DETAILED DESCRIPTION

[0038] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0039] The shielded pump model of the present invention is mainly a spatial utilization of the shielded pump body contour, namely, to carry out simulation tests on the shielded pump installation channel, simulation tests on the secondary transportation of the shielded pump, debugging tests on the shielded pump installation trolley, and simulated installation of the shielded pump, so as to become familiar with the performance of the shielded pump, practice and master the key technologies for the installation of the shielded pump, and through experiments, to pre-discover, identify and solve various problems arising in the installation, to ensure that the shielded pump secondary transportation, channel transportation, shielded pump installation trolley debugging and formal installation are successful at one time, thereby improving on-site construction efficiency, reducing costs and shortening construction period.

[0040] like Figure 1-2 As shown in the figure, the canned motor pump model is based on the canned motor pump manufacturing drawings, combined with the canned motor pump secondary handling, channel transportation and installation process needs to determine the technical requirements and performance parameters of the model. Its purpose is to provide a special tool to achieve at least one of the canned motor pump secondary handling, channel transportation, simulation installation verification and canned motor pump installation trolley adjustment work.

[0041] like Figure 1-2 As shown, the entire canned pump model is generally cylindrical, and its impeller part 1, outlet parts 2 and 3, idler part 4, main flange part 16, motor part 7, and lower bearing part 9 are all coaxially arranged with the main shaft 8, but the diameters of each part are different, and the overall external contour presents a cylindrical shape of cylinders of different diameters stacked along the same axis, presenting columnar steps of different diameters. In the specific example, the outlet part includes an upper outlet part 2 and a lower outlet part 3.

[0042] In the present invention, the upper part and the lower part refer to the part above the main flange or the main flange when the shielded pump or the shielded pump model is installed in place, and the part below the main flange is the lower part. It is just an expression of a relative position relationship.

[0043] In an embodiment of the present invention, the lower bearing portion may correspond to a main body portion of a lower radial bearing and a thrust bearing in the canned motor pump.

[0044] in addition, Figure 1-2 Also shown are the lower flange end face bolts 15, shaft keys 13 and 14, and the drain outlet flange 12 on the outer side of the lower bearing.

[0045] exist Figure 2In the figure, the stator terminal box 10 is at the lower part of the model and is rectangular. There is also a bearing cooling water pipe flange 5 on the idler part, a bearing cooling water pipe flange 11 on the lower bearing part, and a temperature meter measuring point RTD connecting pipe 6.

[0046] As can be understood by those skilled in the art, the outer contour of the entire model needs to be highly similar to the outer contour of the canned pump entity, for example, the similarity reaches 80%, and the model is required to be made in a 1:1 ratio.

[0047] In an exemplary embodiment of the present invention, the canned motor pump model may be designed as follows:

[0048] (1) Although the model is required to be close to the actual shielded pump in terms of the outer shell shape of the lower bearing, motor, main flange, and idler, in actual application, there is no requirement for the specific structure of the impeller and outlet. Therefore, when designing the shielded pump model, according to the outer diameter and height of the impeller and outlet, they are designed into three cylindrical bodies with similar outer diameter and height (the outlet part is divided into two parts, the upper and lower parts), and the interior is a cavity structure. In this way, while ensuring its structural strength, it also reduces weight. Finally, these three parts are assembled together along the main axis in a certain order. The manufacture of the specific structure of the impeller and outlet model is omitted, thereby reducing the manufacturing difficulty and achieving the purpose of similar appearance.

[0049] (2) Since the external shape of the model is required to be close to the actual shape of the shielded pump, but the internal structure of the model is not required to be consistent with the internal structure of the shielded pump, the main flange and the idler wheel can be designed as a stepped cylindrical shape with a hollow structure inside, thereby ensuring that the external shape is close to the actual main flange and idler wheel of the shielded pump in shape. The internal cavity structure can reduce the manufacturing difficulty and weight while ensuring the structural strength of the model, making it easier to carry and install.

[0050] (3) Since there is no requirement for the matching of the secondary cooling water inlet and outlet flanges of the motor housing of the shielded pump with the relevant tooling and shielded pump cart during actual transportation and installation, the production of the secondary cooling water inlet and outlet flanges is omitted in the motor part of the model. It only ensures that the outer diameter and height of the motor part are close to the outer diameter and height of the actual shielded pump motor part, and is designed into a hollow cylindrical shape.

[0051] (4) Although there is a difference in outer diameter between the lower bearing housing and the end flange of the actual shielded pump, and there is a transition between the two, the transition section has no effect on the matching of the tooling and the shielded pump trolley. Therefore, in the model, the lower bearing part and the end flange part are designed as one, that is, they are designed as a hollow cylinder, and the outer diameter is calculated according to the outer diameter of the end flange part with the maximum outer diameter. Its length is consistent with the sum of the length of the shielded pump bearing housing, the length of the transition section, the thickness of the end flange, and the height of the flange end face fastening bolts. This simplifies the structure of the model, saves the steps of manufacturing the transition section and the flange end face bolts, reduces the manufacturing difficulty, and at the same time ensures that the model appearance is close to the actual situation.

[0052] (5) In order to ensure that the various parts of the model can be connected into one in an orderly manner and meet the strength requirements, a full-length main shaft is set in the model to assemble the various parts into one in sequence.

[0053] (6) While ensuring that the model is close to the canned pump in terms of outline, its internal structure can be simplified and only meet the requirements of structural strength to reduce the weight of the model. Accordingly, each part of the model can be designed as a hollow cylinder and assembled with the main shaft in sequence.

[0054] (7) The cooling water pipe and flange on the outside of the bearing, the RTD pipe and bracket of the thermometer measuring point, and the motor junction box are also simplified accordingly, that is, the appearance is close to the actual one.

[0055] In one embodiment of the present invention, the overall idea of ​​making a shielded pump model is to first design and make a main shaft 8 to fix the columnar model parts of each part according to the outer diameter of the main flange part, the outer diameter of the idler part, the outer diameter of the outlet part, the outer diameter of the impeller part, the outer diameter of the motor part under the main flange part, the lower bearing housing part and the outer diameter of the end flange part. Figure 3 for Figure 1 Schematic diagram of the main axis in. Figure 3 As shown in the figure, for the main shaft, the journal has the largest diameter at the main flange and the smallest diameter at the impeller. Figure 1 As shown, each shaft section of the main shaft is provided with a corresponding keyway and a key.

[0056] In the present invention, in addition to using a keyway fitting structure, although not shown, the fixation between the main shaft and the corresponding model part can also be achieved in the following manner: the cross-section of the main shaft is a polygon; and there is a profile fitting structure between the corresponding part of the main shaft and at least one end face or inner wall surface of the corresponding model part.

[0057] Then, according to the outer diameters and lengths of the shielded pump's main flange, idler wheel, outlet, impeller, motor housing at the bottom of the main flange, lower bearing housing, end flange and other parts, cylindrical model parts with corresponding outer diameters and lengths are made. Finally, these cylindrical model parts are mounted on the main shaft. The cylindrical model parts can be connected by welding to form a cylindrical stepped structure.

[0058] The cylinder here can be made of steel pipe, and the two ends are sealed by welding with steel plate sleeve pipe. The middle of the steel plate is opened with an axial hole and keyway matching the size of the shaft neck. The machining accuracy of the axial hole and keyway is general accuracy, and it can be well matched with the main shaft. The welding groove of the specific steel plate can be a 45° groove, and the weld height is flush with the outside of the steel plate. Generally, the plate thickness can be used (except for the main flange). After welding, the entire end face and the outer cylindrical surface of the steel pipe can be finely processed with a processing accuracy of ±0.05mm (except for special instructions in the following steps) to ensure the cylindricality and end face flatness of the model part of each section. The surface processing roughness can be 6.3μm. Q235B or Q345B steel is used for each part of the simulation, and E7018φ3.2 welding rod is used for welding, and manual arc welding is used.

[0059] During the specific production, the lower end of the main flange 16 is divided into the motor part 7, the lower bearing part and the end face flange part 9, which are produced in sequence. The upper end of the main flange part is divided into the idler part 4, the lower part 3 of the outlet part, the upper part 2 of the outlet part and the impeller part 1, which are produced in sequence.

[0060] Next, the production of the main shaft 8 will be described.

[0061] The main shaft 8 has the largest journal at the main flange, and the diameter and length corresponding to the shielded pump can be selected. The journals at the motor part and the lower bearing part at the lower part of the main flange can have diameters and lengths corresponding to the shielded pump respectively. The journals at the idler part 4, the lower part 3 of the outlet part, the upper part 2 of the outlet part, and the impeller part 1 at the upper part of the main flange 16 have diameters and lengths corresponding to the shielded pump respectively. The size of the keyway and the key provided at each section of the journal should be selected according to the mechanical manufacturing manual and the national standard. The processing of the spindle is based on the processing accuracy of general mechanical manufacturing, and it can be assembled reliably and firmly. The straightness of the spindle processing is less than or equal to 0.05mm, and the roughness is 3.2μm.

[0062] from Figure 3It can be seen that, accordingly, the main shaft 8 is a stepped main shaft and has a large diameter portion 80, a first neck portion 81, a second neck portion 82 and a third neck portion 83 located above the large diameter portion and sequentially connected to the large diameter portion, and a fourth neck portion 84 and a fifth neck portion 85 located below the large diameter portion and sequentially connected to the large diameter portion. The main flange portion is arranged on the large diameter portion 80, the impeller portion and the upper portion of the outlet portion are arranged on the third neck portion 83, the lower portion of the outlet portion and the idler portion are respectively arranged on the second neck portion 82 and the first neck portion 81, and the motor portion and the lower bearing portion are respectively arranged on the fourth neck portion 84 and the fifth neck portion 85. Figure 3 As shown, the outer diameters of the first neck portion 81, the second neck portion 82 and the third neck portion 83 decrease in sequence; the outer diameter of the fourth neck portion 84 is greater than the outer diameter of the fifth neck portion 85. In a specific embodiment, the outer diameters of the large diameter portion 80, the first neck portion 81, the second neck portion 82, the third neck portion 83, the fourth neck portion 84 and the fifth neck portion 85 are φ125mm, φ110mm, φ90mm, φ70mm, φ110mm and φ90mm respectively, and the lengths are 527mm, 434.5mm, 264mm, 774.5mm, 2887.3mm and 1535.2mm respectively.

[0063] The production of the main flange portion will be described below. Figure 4 for Figure 1 Schematic diagram of the main flange in.

[0064] The journal of the main shaft 8 corresponding to the main flange 16 has a corresponding length and diameter. The journal of the main shaft portion corresponding to the main flange 16 is φ125mm and the length is 527mm. The end surface processing, bolt hole arrangement and processing accuracy of the main flange 16 can be equivalent to the flange processing accuracy of the shielded pump, that is, ±0.05mm. The main flange can be made of a steel pipe with a diameter of φ2225mm and a wall thickness of δ20mm. End plates with a wall thickness of δ36mm can be set at both ends of the steel pipe. 24 main bolt holes 161 of φ132.6mm are opened on the end plate, totaling 24, and their arrangement and processing accuracy can be equivalent to the main flange of the shielded pump. The center of the end plate can be processed with a φ125mm shaft hole 162 and a keyway 163. The part of the main shaft 8 corresponding to the main flange 16 can be provided with corresponding keyways and keys. The end plate and the steel pipe are fixed by welding. The flatness of both ends of the main flange is ±0.05mm, and the roundness of the outer circle of the steel pipe is ±0.05mm.

[0065] The production of the motor portion will be described below. Figure 5 for Figure 1 Schematic diagram of the motor part.

[0066] The lower part of the main flange part 16 is the motor part 7, whose journal has corresponding length and diameter, and its journal is φ110mm and the length is 2887.3mm. The two ends of the journal can have corresponding keyways and keys. The motor part 7 is made of a steel pipe with a wall thickness of δ16mm, a diameter of φ1615mm, and a length of 2887.3mm. The two ends of the steel pipe can be provided with end plates with a wall thickness of δ=16m. The middle of the end plate has a central shaft hole 71 and a keyway 72 of φ110mm, and matches the corresponding parts on the main shaft. The end plate and the steel pipe are fixedly connected by welding.

[0067] The production of the lower bearing portion and the end flange portion is described below. Figure 6 for Figure 1 Schematic diagram of the lower bearing part and end flange part.

[0068] The lower part of the motor part 7 is the lower bearing part and the end face flange part 9. The main shaft corresponding to this part has a diameter of, for example, φ90mm, a length of 1535.2mm, and is equipped with a keyway and a key. In this embodiment, although the diameter of the lower bearing shell in the shielded pump is larger than the outer diameter of the end face flange, the lower bearing part and the end face flange part are made into one piece in combination with the actual test needs and the factors of simplifying processing and manufacturing, saving funds, etc., and the outer diameter is uniformly specified to be the outer diameter of the end face flange part, that is, φ1510mm, and the length is 1627.2mm. The lower bearing part is made of steel pipe, and the end plates of the two end faces are made of steel plates with a wall thickness of δ16mm. The end plates can be opened with a φ90mm central axis hole and a matching keyway. The end plates and the steel pipe are fixedly connected by welding.

[0069] The production of the idler wheel portion will be described below. Figure 7 for Figure 1 Schematic diagram of the idler wheel section.

[0070] In the shielded pump, the upper bearing is installed inside the main flange. The upper part of the main flange 16 is used to fix the idler part 4. Since the idler part 4 is composed of an upper and lower part, the upper and lower parts have different outer diameters, but the inner diameters are the same. The shaft diameter of the main shaft corresponding to the lower part can be selected to be φ110mm, and it is equipped with a key and a keyway. The lower part of the idler part can be made of a steel pipe with a length of 409.5mm. End plates with a wall thickness of δ=16mm are made at both ends of the steel pipe. A φ110mm central shaft hole and a keyway are opened in the middle of the end plate, and they match the corresponding part of the main shaft. The end plate and the steel pipe are fixed by welding.

[0071] In order to match the pump housing well, the flange on the upper part of the idler part is processed with a boss, the boss height is 25mm, and the outer diameter is φ1717mm. The boss is made of φ1717 steel pipe, the length is 25mm, and the upper end is made of an end plate with a wall thickness of δ=16mm. A φ110mm center shaft hole and a keyway are opened in the middle of the end plate, and the end plate is welded and fixed to the steel pipe. After the boss is formed, it must be processed on a machine tool. The machining accuracy of the upper surface of the boss is the same as the machining accuracy of the flange end face matching surface of the pump housing, that is, the outer diameter tolerance of the boss is 0 to -0.05mm, the roundness is less than 0.05mm, and the perpendicularity between the outer circle of the boss and the end face is less than 0.05mm. Finally, the lower end of the boss is directly welded to the upper end of the idler.

[0072] The shaft diameter of the main shaft corresponding to the upper end face of the idler boss is φ90mm, the length is 264mm, and the corresponding keyway and key are processed. The lower part 3 of the outlet portion is planned to be made of a steel pipe with a diameter of φ1425.5mm and a wall thickness of δ16mm. The length of the steel pipe is 264mm. The upper end of the steel pipe is also made of a steel plate with a wall thickness of δ30mm. The middle of the end plate has a φ90mm shaft hole and a keyway, and the end plate and the steel pipe are fixed by welding. The lower end of the steel pipe can be directly welded to the upper end plate of the idler boss.

[0073] Next, the production of the upper portion 2 of the outlet portion will be described. Figure 8 for Figure 1 Schematic diagram of the upper portion 2 of the outlet portion.

[0074] The upper end of the lower part 3 of the outlet is tightly matched with the upper part of the outlet. The corresponding main shaft diameter is φ70mm and the length is 774.4mm. Considering the needs of field tests and simplifying the manufacturing process, as well as to save costs, the outlet is made into a cylindrical shape. The outlet can be made of a steel pipe with a diameter of φ1190mm and a wall thickness of δ16mm. The length of the steel pipe is 623.5mm. The lower end of the steel pipe is made of a steel plate with a wall thickness of δ16mm to make the end plate, and a φ70mm shaft hole and keyway can be opened in the middle. The upper end of the steel pipe is made into a ring with an outer diameter of φ1158mm and an inner diameter of φ868. The ring is welded to the upper end of the steel pipe. Finally, a steel pipe with an outer diameter of φ868mm, a wall thickness of 16mm and a length of 222.5mm is made. The upper end of the steel pipe is welded to a circular ring, and the lower end is welded to a steel plate with a wall thickness of δ16mm. A circular hole and a keyway are opened on the inner diameter of the steel plate, and the requirements for the matching of the spindle journal are met. The upper part 2 of the outlet portion forms an integral component with an outer layer of a steel pipe and an inner layer of a steel pipe, and the upper part is fixed by a circular ring.

[0075] Next, the production of the impeller part 1 will be described. Fig. 9 for Figure 1 Schematic diagram of the impeller part.

[0076] Also considering the needs of field tests and simplifying the manufacturing process, as well as saving costs, the impeller part 1 is made into a cylindrical shape. The journal of the main shaft corresponding to the impeller part is φ70mm and the length is 373.5mm. The corresponding prefabricated impeller part 1 is made of a steel pipe with a diameter of φ680mm and a wall thickness of δ16mm. The length of the steel pipe is 373.5mm. The upper end of the steel pipe is made of a δ16mm steel plate to make the end plate, and a φ70mm shaft hole and keyway are opened in the middle. When assembling, the lower part of the impeller part 1 is welded with the lower end plate of the inner steel pipe of the upper part 2 of the outlet part. Therefore, the machining accuracy of the corresponding outer circle of the impeller part 1 and the upper part 2 of the outlet part is the same as the machining accuracy of the corresponding end face, that is, the outer diameter tolerance is 0 to 0.05mm, the roundness is less than 0.05mm, and the perpendicularity between the outer circle and the end face is less than 0.05mm.

[0077] After the workpieces of the above 6 steps are completed, these processed parts are installed in sequence with the main shaft to form the main body of the shielded pump model.

[0078] The fabrication and assembly of the remaining components is described below.

[0079] The motor cavity filling and drainage outlet flange 12, the upper bearing cooling water pipe flange 5 and the lower bearing cooling water pipe flange 11, the temperature measuring point joint 6 on the flange end face and the lower bearing end bolt 15 at the outer edge of the lower end flange of the model are made into simulation parts in a 1:1 ratio (only the outer contour is required to be similar), and then they can be welded to the corresponding parts positions.

[0080] The motor stator terminal box 10 is manufactured in a 1:1 ratio and can be welded at the corresponding position of the stator housing 7 .

[0081] It should also be pointed out that the shielded pump model may not be provided with the above-mentioned impeller part and outlet part.

[0082] Based on the above, the present invention proposes the following scheme:

[0083] 1. A canned motor pump model, comprising:

[0084] Idler gear part;

[0085] Main flange;

[0086] Motor Department;

[0087] a lower bearing portion; and

[0088] Spindle,

[0089] in:

[0090] The idler wheel portion, the main flange portion, the motor portion, and the lower bearing portion are sequentially arranged along the main shaft to form a cylindrical stepped structure.

[0091] 2. The canned motor pump model according to item 1, wherein:

[0092] At least one of the idler wheel portion, the main flange portion, the motor portion, and the lower bearing portion is a hollow cylinder with a cavity formed inside.

[0093] 3. The canned motor pump model according to item 1 further includes:

[0094] Impeller part;

[0095] Export outlet,

[0096] in:

[0097] The impeller part, the outlet part, the idler part, the main flange part, the motor part, and the lower bearing part are sequentially arranged along the main shaft to form a cylindrical stepped structure.

[0098] 4. The canned motor pump model according to 3, wherein:

[0099] At least one of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion is a hollow cylinder with a cavity formed inside.

[0100] 5. The canned motor pump model according to 4, wherein:

[0101] The impeller part, the outlet part, the idler part, the main flange part, the motor part and the lower bearing part are all hollow cylinders with cavities formed inside.

[0102] 6. The canned motor pump model according to item 1, wherein:

[0103] The outer peripheral surface of the motor part is not provided with a stator cooling flange part.

[0104] 7. The canned motor pump model according to item 1, wherein:

[0105] The canned motor pump model further includes an end flange portion, and the end flange portion is arranged below the lower bearing portion;

[0106] The end flange portion and the lower bearing portion are formed as one body to form a single cylindrical structure.

[0107] 8. The canned motor pump model according to item 1, wherein:

[0108] A connecting flange portion is provided on an outer circumferential surface of at least one of the idler portion and the lower bearing portion.

[0109] 9. The canned motor pump model according to 8, wherein:

[0110] A measuring connecting pipe portion is provided on an outer circumferential surface of at least one of the idler portion and the lower bearing portion.

[0111] 10. The canned motor pump model according to any one of 1 to 9, wherein:

[0112] The main shaft is a stepped main shaft, or the main shaft is a main shaft with a constant outer diameter.

[0113] 11. The canned motor pump model according to 3, wherein:

[0114] The main shaft is a stepped main shaft and has a large diameter portion, a first shaft neck portion, a second shaft neck portion and a third shaft neck portion located above the large diameter portion and connected to the large diameter portion in sequence, and a fourth shaft neck portion and a fifth shaft neck portion located below the large diameter portion and connected to the large diameter portion in sequence; and

[0115] The main flange portion is arranged on the large diameter portion, the impeller portion and the upper portion of the outlet portion are arranged on the third shaft neck portion, the lower portion of the outlet portion and the idler portion are arranged on the second shaft neck portion and the first shaft neck portion respectively, and the motor portion and the lower bearing portion are arranged on the fourth shaft neck portion and the fifth shaft neck portion respectively.

[0116] 12. The canned motor pump model according to 11, wherein:

[0117] The outer diameters of the first journal neck, the second journal neck and the third journal neck decrease in sequence;

[0118] The outer diameter of the fourth journal portion is greater than the outer diameter of the fifth journal portion.

[0119] 13. The canned motor pump model according to 3, wherein:

[0120] The major axis is generally circular in cross-section; and

[0121] A keyway matching structure is provided between the corresponding portion of the main shaft and at least one end surface or inner wall surface of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion.

[0122] 14. The canned motor pump model according to 3, wherein:

[0123] The cross section of the main axis is polygonal; and

[0124] A corresponding portion of the main shaft has a profile fit structure with at least one end face or inner wall of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion.

[0125] 15. The canned motor pump model according to item 1, wherein:

[0126] The upper surface of the idler wheel portion is provided with a boss suitable for matching with the pump housing.

[0127] The above-mentioned canned pump model can be used in the simulation test of the canned pump installation channel in the key construction technology of nuclear power, the simulation test of the secondary transportation of the canned pump, the adjustment test of the canned pump installation trolley, the simulation installation of the canned pump, etc., so as to improve the construction efficiency, reduce the construction cost and improve the construction quality.

[0128] Accordingly, the present invention also proposes a canned motor pump pre-installation simulation method, comprising the steps of:

[0129] Utilize the canned pump model test according to any one of 1-15 to test: the matching of the canned pump transport tooling or trolley with the canned pump, or the matching of the canned pump transport installation channel with the canned pump.

[0130] The above method may further include the steps of: changing or selecting the structure or structural parameters of the shielded pump transport tooling based on the test results; or the structure or structural parameters of the shielded pump transport installation channel.

[0131] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to the embodiments and combinations of elements may be made without departing from the principles and spirit of the invention, the scope of the invention being defined by the appended claims and their equivalents.

Claims

1. A canned motor pump model, comprising: Idler gear part; Main flange; Motor Department; Lower bearing portion; as well as Spindle, in: The idler part, the main flange part, the motor part, and the lower bearing part are sequentially arranged along the main shaft to form a cylindrical stepped structure; the upper surface of the idler part is provided with a boss suitable for matching with the pump housing, and the lower end of the boss is directly welded to the upper end of the idler; Also includes: Impeller part; The outlet portion is designed to be three cylindrical bodies with similar outer diameters and heights according to the outer diameters and heights of the impeller portion and the outlet portion, and the interiors of the three cylindrical bodies are hollow structures; The impeller part, the outlet part, the idler part, the main flange part, the motor part, and the lower bearing part are sequentially arranged along the main shaft to form a cylindrical stepped structure; the main flange part and the idler part are designed to be stepped cylindrical, and the interior is a cavity structure; at least one of the impeller part, the outlet part, the idler part, the main flange part, the motor part, and the lower bearing part is a cavity cylinder with a cavity formed inside; the lower bearing part and the end flange part are designed to be integrated, and the outer diameter is calculated according to the outer diameter of the end flange part with the maximum outer diameter, and its length is consistent with the sum of the bearing housing length, the transition section length, the end flange thickness, and the height of the flange end face fastening bolts of the shielded pump; The cross section of the main shaft is polygonal; and a corresponding portion of the main shaft has a profile fit structure with at least one end face or inner wall of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion; The outlet portion is made of a steel plate, with an axial hole and a keyway in the middle, and a circular ring is made on the upper end of the steel pipe, which is welded to the upper end of the steel pipe, and a steel plate is welded to the lower end of the steel pipe. A circular hole and a keyway are opened on the inner diameter of the steel plate, and the matching requirements of the spindle journal are met; The pre-installation simulation method comprises the steps of: The canned pump model is used to test: the matching of the canned pump transport tooling or trolley with the canned pump, or the matching of the canned pump transport installation channel with the canned pump; based on the test results, the structure or structural parameters of the canned pump transport tooling are changed or selected; or the structure or structural parameters of the canned pump transport installation channel are changed or selected.

2. The canned motor pump model according to claim 1, wherein: At least one of the idler wheel portion, the main flange portion, the motor portion, and the lower bearing portion is a hollow cylinder with a cavity formed inside.

3. The canned motor pump model according to claim 1, wherein: The impeller part, the outlet part, the idler part, the main flange part, the motor part and the lower bearing part are all hollow cylinders with cavities formed inside.

4. The canned motor pump model according to claim 1, wherein: The outer peripheral surface of the motor part is not provided with a stator cooling flange part.

5. The canned motor pump model according to claim 1, wherein: The canned motor pump model further includes an end flange portion, wherein the end flange portion is arranged below the lower bearing portion; and The end flange portion and the lower bearing portion are formed as one body to form a single cylindrical structure.

6. The canned motor pump model according to claim 1, wherein: A connecting flange portion is provided on an outer circumferential surface of at least one of the idler portion and the lower bearing portion.

7. The canned motor pump model according to claim 6, wherein: A measuring connecting pipe portion is provided on an outer circumferential surface of at least one of the idler portion and the lower bearing portion.

8. The canned motor pump model according to claim 1, wherein: The main shaft is a stepped main shaft, or the main shaft is a main shaft with a constant outer diameter.

9. The canned motor pump model according to claim 1, wherein: The main shaft is a stepped main shaft and has a large diameter portion, a first shaft neck portion, a second shaft neck portion and a third shaft neck portion located above the large diameter portion and connected to the large diameter portion in sequence, and a fourth shaft neck portion and a fifth shaft neck portion located below the large diameter portion and connected to the large diameter portion in sequence; and The main flange portion is arranged on the large diameter portion, the impeller portion and the upper portion of the outlet portion are arranged on the third shaft neck portion, the lower portion of the outlet portion and the idler portion are arranged on the second shaft neck portion and the first shaft neck portion respectively, and the motor portion and the lower bearing portion are arranged on the fourth shaft neck portion and the fifth shaft neck portion respectively.

10. The canned motor pump model according to claim 9, wherein: The outer diameters of the first journal neck, the second journal neck and the third journal neck decrease in sequence; The outer diameter of the fourth journal portion is greater than the outer diameter of the fifth journal portion.

11. The canned motor pump model according to claim 1, wherein: The major axis is generally circular in cross-section; and A keyway matching structure is provided between the corresponding portion of the main shaft and at least one end surface or inner wall surface of the impeller portion, the outlet portion, the idler portion, the main flange portion, the motor portion, and the lower bearing portion.

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