Multi-pump type high-temperature and high-pressure nuclear power main pump testing device and working method thereof

Abstract

According to the multi-pump type high-temperature and high-pressure nuclear power main pump testing device and the working method thereof, a shielding main pump and a shaft seal main pump can be installed on the same side, the height of a test bed is reduced, vibration of the test bed is reduced, and meanwhile the plant height and investment are reduced. The main loop water outlet pipeline is arranged on the upper layer of the test main loop; the main loop water return pipeline and the main regulating valve are arranged on the lower layer of the test main loop; the supporting system further comprises a shaft seal main pump installation platform and a shielding main pump installation platform, the shaft seal main pump installation platform and the shielding main pump installation platform are located on the same side of the main loop supporting frame, a pit is formed in the side, and the shaft seal main pump installation platform and the shielding main pump installation platform are both located above the pit. The mounting flatcar is arranged in the pit; the mounting flatcar comprises a longitudinal moving assembly, a transverse moving assembly, a rotary motion assembly, a lifting assembly and a bearing assembly.

Description

Technical Field

[0001] This invention relates to a multi-pump type high-temperature and high-pressure nuclear power main pump test device and its working method, used for testing the nuclear main pump of the reactor cooling system of a nuclear power plant. Background Technology

[0002] Energy is the main battleground for achieving carbon peaking and carbon neutrality. Nuclear power, with its three major advantages of environmental friendliness, economy, and high efficiency, plays an indispensable role in achieving dual-carbon goals and the clean energy transition. The nuclear power main pump, the only moving piece of equipment in the primary loop of a nuclear power plant, is considered the heart of the reactor cooling system and plays a crucial role in energy conversion. Developing and producing nuclear power main pumps is a key focus and challenge in nuclear power plant construction. Nuclear power main pump testing equipment is an important means of product testing and verification, a key piece of equipment in product development and manufacturing, and a guarantee for successful product delivery. Currently, there are two main types of pressurized water reactor nuclear main pumps in China: canned main pumps and shaft-sealed main pumps. These two types of pumps have different installation methods; the canned main pump is an inverted nuclear main pump with the motor at the bottom and the pump at the top; the shaft-sealed main pump is an upright nuclear main pump with the pump at the bottom and the motor at the top. Due to the large investment required for large-scale nuclear power main pump testing equipment, it is desirable to test both pump types within a single testing facility. The different installation methods bring considerable difficulties to the construction of the test rig.

[0003] Currently, only Shenyang Blower Works Group Nuclear Power Pump Industry Co., Ltd. (hereinafter referred to as Shenyang Blower) and Shanghai Electric KSB Nuclear Power Pump & Valve Co., Ltd. (hereinafter referred to as KSB) in China have test benches capable of simultaneously testing shielded main pumps and shaft seal main pumps.

[0004] Both existing test benches have room for improvement. For Shenyang Blower Works' test bench, please refer to [link / reference needed]. Figure 1 and Figure 2 As shown in the patent with patent number CN201610032093.5 and titled "A Test Device for a Nuclear Power Plant Main Pump," the main shortcomings are as follows: 1. The shaft-sealed main pump 100 and the shielded main pump 200 are installed on opposite sides of the test circuit, resulting in different fixing points of the pipeline when testing different pumps (during the test, the pump under test is fixed while the pipeline moves), and the thermal displacement of the pipeline is in opposite directions, increasing the difficulty of controlling the thermal displacement of the pipeline; 2. The shaft-sealed main pump 100 is installed on the upper pipeline, which increases the net height of the test platform, thereby increasing the height of the plant and increasing the construction cost; 3. When testing a certain pump, the pump casing of another pump is welded to the pipeline, which leads to a deterioration of the overall pipeline flow pattern and an increase in flow resistance, which is not conducive to pump testing, and makes it difficult to test some low-head pumps.

[0005] KSB's test bench (see attached) Figure 3 and Figure 4The main shortcomings are as follows: 1. The test bench lacks a pit. Due to the installation and performance testing requirements of the shaft-sealed main pump 100, the pump inlet pipe length has certain requirements, resulting in a relatively high test pump outlet height. During the testing of the canned main pump 200, a longer straight pipe section is also required above the pump, thus increasing the overall pipeline height and the building height. 2. Both the shaft-sealed main pump 100 and the canned main pump 200 are located on the upper pipeline, with a high pump outlet pipe position (+9.0m). This increases the test bench height, not only increasing the building height and construction costs, but also negatively impacting pump vibration control during testing. 3. When switching between different pumps, the excessively high platform requires disassembly and hoisting from the side, which is not only complex but also involves high-altitude work, posing a significant safety hazard. Summary of the Invention

[0006] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a multi-pump high-temperature and high-pressure nuclear power main pump test device and its working method with a reasonable structural design. It can realize the installation of the shielded main pump and the shaft seal main pump on the same side, reduce the height of the test bench, which is beneficial to reduce the vibration of the test bench, and at the same time reduce the height of the plant and investment.

[0007] The technical solution adopted by this invention to solve the above problems is: a multi-pump type high-temperature and high-pressure nuclear power main pump test device, comprising a test main circuit, a shaft-sealed main pump secondary circuit, a shielded main pump secondary circuit, and a support system; the test main circuit has a two-layer structure, including a main circuit outlet water pipe, a main regulating valve, and a main circuit return water pipe; the inlet of the main circuit outlet water pipe is connected to the outlet of the main regulating valve, and the outlet of the main circuit return water pipe is connected to the inlet of the main regulating valve; when conducting a shaft-sealed main pump test, a shaft-sealed main pump secondary circuit is set up; when conducting a shielded main pump test, a shielded main pump secondary circuit is set up; the support system includes a main circuit support frame, and the test main circuit is installed on the main circuit support frame; the feature is that it also includes an installation flatcar; the main circuit outlet water pipe is set on the upper layer of the test main circuit; the main circuit return water pipe and the main regulating valve are both set on the lower layer of the test main circuit; the support system also includes a shaft-sealed main pump installation platform and The shielded main pump mounting platform, the shaft seal main pump mounting platform, and the shielded main pump mounting platform are located on the same side of the main circuit support frame, and a pit is provided on this side. Both the shaft seal main pump mounting platform and the shielded main pump mounting platform are located above the pit. The installation flatcar is set in the pit. The installation flatcar includes a longitudinal moving component, a transverse moving component, a rotary motion component, a lifting component, and a load-bearing component. The longitudinal moving component includes a longitudinal chassis, a wheel set, and a drive mechanism. The wheel set and the drive mechanism are both mounted on the longitudinal chassis. The transverse moving component includes a transverse chassis, which is slidably mounted on the longitudinal chassis along the transverse direction. The rotary motion component includes a rotary support, which is horizontally rotatably mounted on the transverse chassis. The lifting component includes a lifting support and a hydraulic cylinder. The lifting support is vertically slidably mounted on the rotary support. The hydraulic cylinder is mounted on the rotary support and connected to the lifting support. The load-bearing component is fixed to the top of the lifting support.

[0008] The secondary circuit of the shaft-sealed main pump of the present invention includes a shaft-sealed main pump casing, a shaft-sealed main pump inlet pipe, and a shaft-sealed main pump outlet pipe. During shaft-sealed main pump testing: the inlet of the shaft-sealed main pump inlet pipe is connected to the outlet of the main circuit outlet pipe, and the outlet is connected to the inlet of the shaft-sealed main pump casing; the inlet of the shaft-sealed main pump outlet pipe is connected to the outlet of the shaft-sealed main pump casing, and the outlet is connected to the inlet of the main circuit return water pipe. The secondary circuit of the shielded main pump includes a shielded main pump casing, a shielded main pump inlet pipe, and a shielded main pump outlet pipe. During shielded main pump testing: the inlet of the shielded main pump inlet pipe is connected to the outlet of the main circuit outlet pipe, and the outlet is connected to the inlet of the shielded main pump casing; the inlet of the shielded main pump outlet pipe is connected to the outlet of the shielded main pump casing, and the outlet is connected to the inlet of the main circuit return water pipe.

[0009] The main circuit water outlet pipe of the present invention is equipped with an outlet flange, and the main circuit return water pipe is equipped with a return water flange.

[0010] The shielded main pump mounting platform of the present invention is set on the main circuit support frame, and the shaft seal main pump mounting platform is set on the ground at the top of the pit.

[0011] In this invention, the outlet of the shaft seal main pump inlet pipe extends downward into the pit and then upward, finally connecting to the inlet of the shaft seal main pump casing.

[0012] The bearing assembly of the present invention includes a bearing seat, a bearing block assembly, and a positioning pin; the bearing seat is fixed to the top of the lifting bracket; the bearing block assembly and the positioning pin are both installed on the bearing seat.

[0013] The bearing block assembly of the present invention includes a base, an upper bearing block, a lower bearing block, and an adjusting bolt; the base is fixedly installed on the bearing seat; the lower bearing block is slidably disposed on the base, the upper bearing block is disposed on the lower bearing block, and the contact surface between the upper bearing block and the lower bearing block is an inclined surface; the adjusting bolt is rotatably installed on the base and connected to the lower bearing block.

[0014] The top surface of the bearing seat described in this invention is provided with an arc-shaped groove, and the bottom surface of the base is an arc-shaped surface that matches it.

[0015] The positioning pin of the present invention includes a positioning pin seat, a pin, and a baffle; the positioning pin seat is fixed on the bearing seat; the pin is vertically inserted into the positioning pin seat; the baffle is installed in the positioning pin seat and supports the pin.

[0016] A working method for a multi-pump type high-temperature and high-pressure nuclear power main pump test device, characterized by comprising the following processes: (a) Shaft seal main pump test, including the following steps: (1) During the test of the shaft seal main pump, the pump casing of the shaft seal main pump is set on the shaft seal main pump mounting platform; (2) The plant crane lifts the shaft seal main pump to the shaft seal main pump casing and installs the shaft seal main pump and the shaft seal main pump casing together; (3) The test medium enters the outlet pipe of the shaft seal main pump from the outlet of the shaft seal main pump casing, passes through the main regulating valve along the main circuit return water pipe, enters the main circuit outlet water pipe upward, and then returns to the inlet of the shaft seal main pump casing through the shaft seal main pump inlet pipe for circulation. (II) The test of the shielded main pump includes the following steps: (1) During the test of the canned main pump, the pump casing of the canned main pump is set on the canned main pump mounting platform; (2) The factory crane lifts the canned main pump into the lifting bracket, and the flange of the canned main pump is supported on the load-bearing component; (3) The drive unit drives the longitudinal moving component to move to the bottom of the shielded main pump casing; (4) The hydraulic cylinder drives the lifting bracket to rise, and the lifting bracket drives the shielded main pump to rise. During the rise, check the alignment error between the shielded main pump and the shielded main pump casing. If the position error exceeds the tolerance, push the transverse chassis to move laterally and rotate the slewing bracket to adjust the position of the shielded main pump. After the position adjustment is completed, lift the shielded main pump into place. (5) Install the canned main pump and the canned main pump casing together; (6) The test medium enters the outlet pipe of the shielded main pump from the outlet of the shielded main pump casing, passes through the main regulating valve along the main circuit return water pipe, enters the main circuit outlet water pipe upward, and then returns to the inlet of the shielded main pump casing through the inlet pipe of the shielded main pump for circulation.

[0017] Compared with the prior art, the present invention has the following advantages and effects: (1) The present invention has two different pump types (upright core main pump and inverted core main pump) with two installation positions on the same side and a pit is set up at the same time, which reduces the height of the test bench, which is beneficial to reduce the vibration of the test bench, and at the same time reduces the height of the factory building and investment.

[0018] (2) The main circuit pipeline of the test bench is simple. During the test, the medium does not need to pass through another pump casing, and the fluid flow is stable, which is beneficial to the pump test.

[0019] (3) For the first time, an inverted nuclear pump installation flatcar was used on the test bench, which facilitated the installation of the test pump and reduced the installation difficulty.

[0020] (4) Both the shaft seal main pump and the canned main pump are installed in the lower pipeline. The pump outlet pipe is located at a lower position (+3.0m), which reduces the net height of the test bench. This not only reduces the height of the factory building and the construction cost, but also greatly benefits the pump vibration control during the test. Attached Figure Description

[0021] Figure 1 This is a simplified schematic diagram of the shaft seal main pump being tested on the Shenyang Blower Works test bench; Figure 2 This is a simplified schematic diagram of the Shenyang Blower Works test bench testing a canned main pump; Figure 3 This is a simplified schematic diagram of the KSB test bench testing the shaft seal main pump; Figure 4 This is a simplified schematic diagram of the KSB test bench testing a canned main pump; Figure 5 This is a schematic diagram of the elevation structure of the shaft seal main pump during testing according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the lower planar structure during testing of the shaft seal main pump according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the upper planar structure during the testing of the shaft seal main pump according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the elevation structure during the testing of the shielded main pump according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the lower planar structure during testing of the shielded main pump according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the upper planar structure during testing of the shielded main pump according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure for installing the flatcar in an embodiment of the present invention; Figure 12 This is a schematic diagram of the longitudinal movement component of the flatcar in an embodiment of the present invention; Figure 13 This is a schematic diagram of the drive mechanism for installing the flatcar according to an embodiment of the present invention; Figure 14 This is a schematic diagram of the structure of the lateral movement component of the flatcar installed in an embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the rotary motion component of the flatcar installed in an embodiment of the present invention; Figure 16 This is a schematic diagram of the lifting assembly for installing the flatcar according to an embodiment of the present invention; Figure 17 This is a schematic diagram of the structure of the load-bearing component for installing the flatcar in an embodiment of the present invention; Figure 18 This is a schematic diagram of the positioning pin structure for installing the flatcar according to an embodiment of the present invention; Figure 19 This is a schematic diagram of the load-bearing block assembly for installing the flatcar in an embodiment of the present invention. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0023] The embodiments of the present invention include an installation flatcar 1, a test main circuit, a shaft seal main pump secondary circuit, a shielded main pump secondary circuit, and a support system 3.

[0024] The test main circuit of this invention embodiment has a two-layer structure, including an outlet flange 6, a main circuit water outlet pipe 7, a main regulating valve 300, a return water flange 9, a main circuit return water pipe 10, and a flow meter 11.

[0025] The inlet of the main circuit outlet pipe 7 is connected to the outlet of the main regulating valve 300, and an outlet flange 6 is installed on the outlet. Two flow meters 11 are installed on the main circuit outlet pipe 7. The outlet flange 6, the main circuit outlet pipe 7, and the flow meters 11 are all located on the upper layer of the test main circuit. The outlet of the main circuit return pipe 10 is connected to the inlet of the main regulating valve 300, and a return flange 9 is installed on the inlet. The main regulating valve 300 is horizontally arranged. The main circuit return pipe 10, the main regulating valve 300, and the return flange 9 are all located on the lower layer of the test main circuit. The structure of the test main circuit ensures that, during the test, both the shaft-sealed main pump 100 and the canned main pump 200 are located in the lower layer of the pipeline.

[0026] The support system 3 includes a main circuit support frame 12, a shaft seal main pump mounting platform 14, and a shielded main pump mounting platform 16. The test main circuit is mounted on the main circuit support frame 12. The shaft seal main pump mounting platform 14 and the shielded main pump mounting platform 16 are located on the same side of the main circuit support frame 12, and a pit 17 is provided on this side. Both the shaft seal main pump mounting platform 14 and the shielded main pump mounting platform 16 are located above the pit 17. The shaft seal main pump mounting platform 14 is used for testing the shaft seal main pump 100, and the shielded main pump mounting platform 16 is used for testing the shielded main pump 200. The shielded main pump mounting platform 16 is set on the main circuit support frame 12, and the shaft seal main pump mounting platform 14 is set on the ground at the top of the pit 17.

[0027] The secondary circuit of the shaft-sealed main pump includes the shaft-sealed main pump casing 2, the shaft-sealed main pump inlet pipe 4, and the shaft-sealed main pump outlet pipe 8. During shaft-sealed main pump testing: the inlet of the shaft-sealed main pump inlet pipe 4 is connected to the outlet of the main circuit outlet pipe 7 via the outlet flange 6. The outlet extends downwards into the pit 17 and then upwards, finally connecting to the inlet of the shaft-sealed main pump casing 2, thus reducing the height of the test bench. The inlet of the shaft-sealed main pump outlet pipe 8 is connected to the outlet of the shaft-sealed main pump casing 2, and the outlet is connected to the inlet of the main circuit return water pipe 10 via the return water flange 9.

[0028] The secondary circuit of the canned main pump includes the canned main pump casing 13, the canned main pump inlet pipe 5, and the canned main pump outlet pipe 15. During canned main pump testing: the inlet of the canned main pump inlet pipe 5 is connected to the outlet of the main circuit outlet pipe 7 via the outlet flange 6, and the outlet is connected to the inlet of the canned main pump casing 13; the inlet of the canned main pump outlet pipe 15 is connected to the outlet of the canned main pump casing 13, and the outlet is connected to the inlet of the main circuit return water pipe 10 via the return water flange 9.

[0029] The flatcar 1 is installed in the pit 17.

[0030] The installation flatcar 1 includes a longitudinal movement component 101, a transverse movement component 102, a rotary motion component 103, a lifting component 104, a load-bearing component 105, a work platform 106, and a longitudinal track 107.

[0031] The longitudinal track 107 is installed on the ground of the pit 17 along the longitudinal direction.

[0032] The longitudinal moving assembly 101 includes a longitudinal chassis 1011, a wheel set 1012, and a drive mechanism 1013. Both the wheel set 1012 and the drive mechanism 1013 are mounted on the longitudinal chassis 1011. The wheel set 1012 is positioned on a longitudinal track 107. The drive mechanism 1013 drives the longitudinal moving assembly 101 to move longitudinally along the longitudinal track 107. The drive mechanism 1013 includes a servo motor 131, a reducer 132, a coupling 133, a gearbox 134, and a rack and pinion pair 135. The gears and rack in the rack and pinion pair 135 mesh. The servo motor 131 is connected to the reducer 132, which is connected to the gearbox 134 via the coupling 133. The gearbox 134 is connected to the gears of the rack and pinion pair 135. The rack of the rack and pinion pair 135 is mounted on the ground longitudinally and parallel to the longitudinal track 107 to ensure accurate positioning. The top surface of the longitudinal chassis 1011 has linear guide rail grooves and mounting holes for mounting transverse guide rails 1022.

[0033] The lateral movement assembly 102 includes a lateral chassis 1021 and a lateral guide rail 1022. The lateral chassis 1021 is slidably mounted on the longitudinal chassis 1011 along the lateral direction via the lateral guide rail 1022, and the lateral movement of the lateral movement assembly 102 can be controlled for alignment adjustment. The top surface of the lateral chassis 1021 has an arc-shaped guide rail groove and mounting holes for mounting the rotary guide rail 32. The lateral movement assembly 102 can be driven by a hydraulic cylinder, which drives the lateral chassis 1021 to move.

[0034] The rotary motion assembly 103 includes a rotary support 31 and a rotary guide rail 32. The rotary support 31 is horizontally rotatable on the transverse chassis 1021 via the rotary guide rail 32, and can control the rotary motion assembly 103 to rotate around its center for alignment and adjustment. The rotary guide rail 32 is an arc-shaped guide rail. The inner side of the column of the rotary support 31 has a guide rail groove and mounting holes for mounting a vertical guide rail 43. The rotary motion assembly 103 can be driven by a hydraulic cylinder, which drives the rotary support 31 to rotate.

[0035] The lifting assembly 104 includes a lifting bracket 41, a hydraulic cylinder 42, and a vertical guide rail 43. The lifting bracket 41 is vertically slidably mounted on the rotary bracket 31 via the vertical guide rail 43. The hydraulic cylinder 42 is mounted on the rotary bracket 31 and connected to the lifting bracket 41, driving the lifting bracket 41 to lift and lower. Four hydraulic cylinders 42 are provided, and their synchronous lifting and lowering are controlled by a proportional valve. The top surface of the lifting bracket 41 has a tray mounting hole. The front of both the rotary bracket 31 and the lifting bracket 41 has an opening.

[0036] The support assembly 105 comprises two symmetrically mounted components, including a support base 51, a support block assembly 52, and a positioning pin 53. The support base 51 is bolted to the top of the lifting bracket 41. The support block assembly 52 includes a base 521, an upper support block 522, a lower support block 523, and an adjusting bolt 524. The base 521 is bolted to the support base 51. The top surface of the support base 51 has an arc-shaped groove, and the bottom surface of the base 521 is a matching arc-shaped surface, which can counteract the slight bending of the support assembly 105 under pressure. The lower support block 523 is slidably mounted on the base 521, and the upper support block 522 is mounted on the lower support block 523. The contact surface between the upper support block 522 and the lower support block 523 is an inclined surface. Adjusting bolt 524 is rotatably mounted on base 521 and connected to lower support block 523. Rotating adjusting bolt 524 causes lower support block 523 to slide on base 521, and lower support block 523 pushes upper support block 522 up and down to accommodate the installation of the inverted pump. There are four support block assemblies 52, all of which can be adjusted independently to achieve leveling of the mounting surface. Positioning pin 53 includes positioning pin seat 531, pin 532, and baffle 533. Positioning pin seat 531 is fixed to support base 51 by bolts; pin 532 is vertically inserted into positioning pin seat 531; baffle 533 is installed in positioning pin seat 531 and supports pin 532. The pin 532 engages with the bolt hole of the inverted pump flange to ensure the positioning and stability of the workpiece. The pin 532 is limited by the baffle 533. After positioning is completed, the baffle 533 can be removed so that the pin 532 falls into the positioning pin seat 531, and the positioning pin 53 can be completely removed so as not to affect the subsequent bolt insertion.

[0037] The working platform 106 is installed on the outside and rear of the rotary support 31, which facilitates manual operation of the bearing component 105 and fixation of the pump.

[0038] A working method for a multi-pump type high-temperature and high-pressure nuclear power main pump test device includes the following processes: (a) Shaft seal main pump test, including the following steps: (1) During the test of the shaft seal main pump 100, the shaft seal main pump casing 2 is set on the shaft seal main pump mounting platform 14; (2) The factory crane lifts the shaft seal main pump 100 to the shaft seal main pump casing 2 and connects the shaft seal main pump 100 and the shaft seal main pump casing 2.

[0039] (3) The test medium (deionized water) enters the shaft seal main pump outlet pipe 8 from the outlet of the shaft seal main pump casing 2, passes through the main regulating valve 300 along the main circuit return water pipe 10, enters the main circuit outlet water pipe 7 and flow meter 11, and then returns to the inlet of the shaft seal main pump casing 2 through the shaft seal main pump inlet pipe 4 for circulation.

[0040] The test of 100 shaft seal main pumps of different specifications was achieved by replacing the shaft seal main pump inlet pipe 4, the shaft seal main pump casing 2, and the shaft seal main pump outlet pipe 8.

[0041] (II) The test of the shielded main pump includes the following steps: (1) During the test of the shielded main pump 200, the shielded main pump casing 13 is set on the shielded main pump mounting platform 16.

[0042] (2) The installation flatcar stops in front of the test bench, and all moving parts return to the starting point; the factory crane horizontally enters the shielded main pump 200 into the lifting bracket 41 from the opening at the front of the rotary bracket 31 and the lifting bracket 41, rather than directly above it, which effectively saves height space and enables the invention to adapt to factories with low height; the crane lifts the shielded main pump 200 into the lifting bracket 41, the flange of the shielded main pump 200 is supported on the upper bearing block 522, and the pin 532 is inserted into the flange bolt hole of the shielded main pump 200 to achieve positioning.

[0043] (3) The drive mechanism 1013 drives the longitudinal moving component 101 to travel along the longitudinal direction on the longitudinal track 107 to below the shielded main pump casing 13; (4) Remove the tray positioning pin 53; (5) The hydraulic cylinder 42 drives the lifting bracket 41 to rise, and the lifting bracket 41 drives the shielded main pump 200 to rise. During the rise, check the alignment error between the shielded main pump 200 and the shielded main pump casing 13. If the position error exceeds the tolerance, push the transverse chassis 1021 to move laterally and rotate the slewing bracket 31 to adjust the position of the shielded main pump 200. After the position adjustment is completed, lift the shielded main pump 200 into place. (6) Tighten 3 to 4 bolts and nuts on the shielded main pump 200 to initially fix the shielded main pump 200 and the shielded main pump casing 13. Then, lower the installation flatcar to its original position and back to the center of the pit.

[0044] (7) Start tightening the remaining pump fixing bolts and tighten the nuts as required to fix the canned main pump 200 to the canned main pump casing 13.

[0045] (8) The disassembly process is the reverse of the installation process.

[0046] (9) The test medium (deionized water) enters the outlet pipe 15 of the shielded main pump from the outlet of the shielded main pump casing 13, passes through the main regulating valve 300 along the main circuit return water pipe 10, enters the main circuit outlet water pipe 7 and flow meter 11, and then returns to the inlet of the shielded main pump casing 13 through the shielded main pump inlet pipe 5 for circulation.

[0047] The test of different specifications of shielded main pump 200 was achieved by replacing the shielded main pump inlet pipe 5, the shielded main pump casing 13, and the shielded main pump outlet pipe 15.

[0048] This invention provides a high-temperature, high-pressure, full-flow test apparatus that can meet the type testing requirements for the hydraulic performance, engineering operation characteristics, and durability characteristics of a nuclear main pump prototype. Test flow range 5000m 3 / h to 30000m 3 / h, flow measurement accuracy ≤±1.5%; The test temperature range is 21°C to 350°C, and the designed maximum heating rate is 55°C / h. The test pressure range is 0-17.2 MPa, and the pressure measurement accuracy is ≤ ±1.0%. The test pump's speed range is 0-1500 r / min, and the speed measurement accuracy is ≤ ±0.35%. Maximum test power: 9150kW, input power measurement accuracy ≤±1.0%.

[0049] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components, etc. The above description is merely illustrative of the structure of the present invention. All equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A multi-pump type high temperature and high pressure nuclear power main pump test device, comprising a test main loop, a shaft seal main pump secondary loop, a shielding main pump secondary loop and a support system; the test main loop has a two-layer structure, comprising a main loop water outlet pipeline, a main regulating valve and a main loop water return pipeline; the inlet of the main loop water outlet pipeline is connected with the outlet of the main regulating valve, and the outlet of the main loop water return pipeline is connected with the inlet of the main regulating valve; the shaft seal main pump secondary loop is arranged when the shaft seal main pump test is performed, and the shielding main pump secondary loop is arranged when the shielding main pump test is performed; the support system comprises a main loop support frame, and the test main loop is installed on the main loop support frame; characterized in that: The installation flat car is arranged in the pit; the installation flat car comprises a longitudinal moving assembly, a transverse moving assembly, a rotary moving assembly, a lifting assembly and a bearing assembly; the longitudinal moving assembly comprises a longitudinal chassis, a wheel set and a driving mechanism; the wheel set and the driving mechanism are both arranged on the longitudinal chassis; the transverse moving assembly comprises a transverse chassis which is slidably arranged on the longitudinal chassis along a transverse direction; the rotary moving assembly comprises a rotary support which is horizontally rotatably arranged on the transverse chassis; the lifting assembly comprises a lifting support and an oil cylinder; the lifting support is vertically slidably arranged on the rotary support; the oil cylinder is arranged on the rotary support and connected with the lifting support; and the bearing assembly is fixed on the top of the lifting support.

2. The multi-pump type high-temperature and high-pressure nuclear power main pump test device according to claim 1, characterized in that: The shaft seal main pump secondary circuit comprises a shaft seal main pump pump shell, a shaft seal main pump inlet pipeline and a shaft seal main pump outlet pipeline; when the shaft seal main pump test is performed, the inlet of the shaft seal main pump inlet pipeline is connected with the outlet of the main circuit water outlet pipeline, the outlet is connected with the inlet of the shaft seal main pump pump shell, the inlet of the shaft seal main pump outlet pipeline is connected with the outlet of the shaft seal main pump pump shell, and the outlet is connected with the inlet of the main circuit water return pipeline; the shield main pump secondary circuit comprises a shield main pump pump shell, a shield main pump inlet pipeline and a shield main pump outlet pipeline; when the shield main pump test is performed, the inlet of the shield main pump inlet pipeline is connected with the outlet of the main circuit water outlet pipeline, the outlet is connected with the inlet of the shield main pump pump shell, the inlet of the shield main pump outlet pipeline is connected with the outlet of the shield main pump pump shell, and the outlet is connected with the inlet of the main circuit water return pipeline.

3. The multi-pump type high-temperature and high-pressure nuclear power main pump test device according to claim 2, characterized in that: The outlet of the main circuit water outlet pipeline is provided with an outlet end flange, and the inlet of the main circuit water return pipeline is provided with a water return end flange.

4. The multi-pump type high-temperature and high-pressure nuclear power primary pump test device according to claim 1, characterized in that: The shield main pump mounting platform is arranged on the main circuit support frame, and the shaft seal main pump mounting platform is arranged on the ground on the top of the pit.

5. The multi-pump type high-temperature and high-pressure nuclear power main pump test device according to claim 2, characterized in that: The outlet of the shaft seal main pump inlet pipeline extends downward into the pit and then extends upward, and finally is connected with the inlet of the shaft seal main pump pump shell.

6. The multi-pump type high-temperature and high-pressure nuclear main pump test device according to claim 2, characterized in that: The bearing assembly comprises a bearing seat, a bearing block assembly and a positioning pin; the bearing seat is fixed on the top of the lifting support; the bearing block assembly and the positioning pin are both arranged on the bearing seat.

7. The multi-pump type high-temperature high-pressure nuclear main pump test device according to claim 6, characterized by: The bearing block assembly comprises a base, an upper bearing block, a lower bearing block and an adjusting bolt; the base is fixedly arranged on the bearing seat; the lower bearing block is slidably arranged on the base, the upper bearing block is arranged on the lower bearing block, and the contact surface between the upper bearing block and the lower bearing block is an inclined surface; and the adjusting bolt is rotatably arranged on the base and connected with the lower bearing block.

8. The multi-pump type high-temperature high-pressure nuclear main pump test device according to claim 7, characterized by: An arc-shaped groove is arranged on the top surface of the bearing seat, and the bottom surface of the base is an arc-shaped surface matched with the arc-shaped groove.

9. The multi-pump type high-temperature and high-pressure nuclear main pump test apparatus according to claim 6, characterized by: The positioning pin comprises a positioning pin seat, a pin and a baffle; the positioning pin seat is fixed on the bearing seat; the pin is vertically inserted into the positioning pin seat; the baffle is installed in the positioning pin seat and supports the pin.

10. A method for operating a multi-pump type high-temperature high-pressure nuclear power primary pump test device according to any one of claims 2-9, characterized in that: The method comprises the following processes: (1) The shaft seal main pump is set on the shaft seal main pump installation platform during the shaft seal main pump test; (2) The shaft seal main pump is hoisted by the plant crane and is installed together with the shaft seal main pump shell; (3) The test medium enters the shaft seal main pump outlet pipeline from the outlet of the shaft seal main pump shell, passes through the main regulating valve along the main loop water return pipeline, enters the main loop water outlet pipeline upward, and then returns to the inlet of the shaft seal main pump shell through the shaft seal main pump inlet pipeline to circulate; (1) The shield main pump is set on the shield main pump installation platform during the shield main pump test; (2) The shield main pump is hoisted by the plant crane and is installed together with the shield main pump shell; (3) The driving machine drives the longitudinal moving assembly to move to the position below the shield main pump shell; (4) The oil cylinder drives the lifting support to ascend, and the lifting support drives the shield main pump to ascend; during the ascending, the centering error between the shield main pump and the shield main pump shell is checked; if the position error is out of tolerance, the horizontal movement and rotation of the horizontal chassis and the rotating support are driven to adjust the position of the shield main pump; after the position adjustment is completed, the shield main pump is lifted into position; (5) The shield main pump is installed together with the shield main pump shell; (6) The test medium enters the shield main pump outlet pipeline from the outlet of the shield main pump shell, passes through the main regulating valve along the main loop water return pipeline, enters the main loop water outlet pipeline upward, and then returns to the inlet of the shield main pump shell through the shield main pump inlet pipeline to circulate. ​ ​

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