Rotor structure of low-pressure safety injection pump

Abstract

The utility model discloses a rotor structure of a low-pressure safety injection pump, and relates to the field of nuclear power equipment.The rotor structure comprises a rotating shaft body and impeller mechanisms arranged on the surface of the rotating shaft body in a surrounding and equally-divided array mode, and a second pressure adjusting mechanism and a first pressure adjusting mechanism which are used for adjusting oil pressure are arranged at the upper end of the surface of the rotating shaft body from top to bottom; a main oil passage for storing hydraulic oil is formed in the middle of the inner cavity of the spindle body; the impeller mechanism comprises a first piston column movably inserted into a side oil channel in the surface of the rotating shaft body, the side oil channel is communicated with the main oil channel, a mounting base used for mounting an impeller is fixedly arranged on the side, located outside, of the first piston column, and the surface of the end, located on the side oil channel, of the first piston column is sleeved with a plurality of first sealing rings abutting against the inner wall of the side oil channel to achieve sealing. When the end of the impeller is abraded and the rotor is installed, the gap between the impeller and the pump shell can be adjusted through the first pressure adjusting mechanism and the second pressure adjusting mechanism, and then the assembly precision of the safety injection pump is improved.

Description

Technical Field

[0001] The present application relates to the field of nuclear power equipment, and in particular to a rotor structure of a low-pressure injection pump. Background Art

[0002] The low-pressure injection pump is an important part of the low-pressure injection system (RIS) in nuclear power plants. Therefore, the low-pressure injection pump is one of the important safety equipment in nuclear power plants and is also a key equipment in nuclear power plants. The low-pressure injection pump is an important nuclear secondary pump, and its seismic resistance requirement reaches seismic resistance class IA. The main function of the low-pressure injection pump in a nuclear power plant is to perform low-pressure injection in the event of a reactor coolant loss accident and a steam pipeline rupture or a water supply pipeline rupture accident in the containment, so as to ensure the safe operation of the nuclear power plant. The impeller on the surface of the rotor component of the low-pressure injection pump is an important part of it.

[0003] For example, the rotor component for a low-pressure injection pump in patent number CN201320584488.8 has the following deficiencies in actual use:

[0004] The impeller of the rotor pump of the above patent rotates at a relatively fast speed, and the liquid rotates at a high speed in the pump, generating a large centrifugal force, which may cause the pump body and the ends of the impeller to be susceptible to wear, resulting in a tiny gap between the impeller and the pump casing, which may easily lead to medium leakage. At the same time, when the end of the impeller is worn and when the rotor is installed, the gap between the impeller and the pump casing cannot be adjusted, resulting in reduced assembly accuracy of the injection pump. Summary of the invention

[0005] In order to improve the problem that the impeller cannot be adjusted, resulting in accelerated damage to the injection pump, the present application provides a rotor structure of a low-pressure injection pump.

[0006] The rotor structure of a low-pressure injection pump provided in this application adopts the following technical solution:

[0007] A rotor structure of a low-pressure injection pump, comprising a rotating shaft body, and an impeller mechanism arranged in an equally divided array around the surface of the rotating shaft body, wherein a second pressure regulating mechanism and a first pressure regulating mechanism for adjusting oil pressure are respectively arranged on the upper end of the surface of the rotating shaft body from top to bottom, and the second pressure regulating mechanism and the first pressure regulating mechanism have the same structural dimensions;

[0008] A main oil passage for storing hydraulic oil is provided in the middle of the inner cavity of the shaft body;

[0009] The impeller mechanism includes a piston column movably inserted in the side oil channel on the surface of the rotating shaft body, the side oil channel is connected to the main oil channel, and a mounting seat for installing the impeller is fixed on the side of the piston column located outside. A plurality of sealing rings are sleeved on the surface of one end of the piston column located in the side oil channel to abut against the inner wall of the side oil channel to achieve sealing.

[0010] By adopting the above technical solution, the main oil channel is connected with the side oil channel and the pressure regulating channel to realize the transmission of hydraulic oil, and then the impeller mechanism is adjusted by the hydraulic oil, making the impeller adjustment simpler.

[0011] Preferably, the side oil passages are arranged in an equally divided array on the inner side of the shaft body, and mounting grooves communicating with the side oil passages are arranged in an equally divided array on the outer side of the shaft body, and a retaining ring is fixed in the middle of the mounting groove.

[0012] By adopting the above technical solution, the hydraulic oil inside the side oil channel can push the impeller mechanism to move, thereby changing the gap between the impeller and the casing, making it more convenient to adjust the impeller, without the need to disassemble the impeller for adjustment or replace the impeller to increase maintenance costs.

[0013] Preferably, the impeller mechanism further comprises a limiting ring fixedly arranged at a middle portion of an outer surface of the piston column, wherein the limiting ring is located between the retaining ring and the bottom of the inner cavity of the mounting groove.

[0014] By adopting the above technical solution, the distance between the limit ring and the retaining ring and the bottom of the inner cavity of the installation groove is the movable distance of the impeller, so the distance cannot be set too large and can be within a certain value.

[0015] Preferably, the mounting seat is located inside the mounting groove and one end of the mounting seat abuts against one end of the retaining ring.

[0016] By adopting the above technical solution, the retaining ring limits the installation groove and provides support at the same time, so that the impeller is more stable when rotating.

[0017] Preferably, space for the limiting ring to move is reserved between the two side surfaces of the limiting ring and the retaining ring and the bottom of the inner cavity of the installation groove.

[0018] By adopting the above technical solution, the space is convenient for adjusting the impeller mechanism.

[0019] Preferably, two pressure regulating channels connected to the main oil channel are respectively provided on the upper end of the surface of the shaft body from top to bottom, and the inner wall of the pressure regulating channel located on the outer side is etched with scales.

[0020] By adopting the above technical solution, the distance moved by the impeller can be read by observing the distance moved by the end face of the countersunk bolt head on the scale, and then the distance between the impeller end and the inner wall of the casing can be calculated.

[0021] Preferably, the pressure regulating mechanism 1 comprises a piston column 2 movably plugged into the pressure regulating channel located at half of the main oil channel, and both ends of the surface of the piston column 2 are sleeved with a sealing ring 2 which abuts against and seals the inner wall of the pressure regulating channel.

[0022] By adopting the above technical solution, the sealing ring 2 plays a sealing role, preventing hydraulic oil leakage from affecting the oil pressure inside the main oil channel and avoiding inaccurate adjustment of the impeller.

[0023] Preferably, the pressure regulating channel is located on the outer side and is threadedly fixed with a countersunk bolt, and the countersunk bolt is located in the middle of one side of the piston column and is fixed with a T-shaped column rotatably arranged in a T-shaped groove located in the middle of one side of the countersunk bolt with the piston column.

[0024] By adopting the above technical solution, when the T-shaped column rotates in the T-shaped groove, the countersunk bolt can be rotated to convert the rotational force into a driving force, thereby driving the piston column 2 to move.

[0025] In summary, the present application includes at least one of the following beneficial technical effects:

[0026] 1. Use either the pressure regulating mechanism 1 or the pressure regulating mechanism 2 to squeeze or pump the hydraulic oil to drive the impeller mechanism to move in the side oil channel, thereby changing the gap between the impeller and the inner wall of the casing. Even if the impeller end is worn and the rotor is installed, it can be adjusted after installation, so that the impeller can be used continuously. Adjustment after installation can improve the installation accuracy of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an overall axonometric diagram of the rotor structure of the low-pressure injection pump of the present application;

[0028] Figure 2 It is a front cross-sectional schematic diagram of the rotor structure of the low-pressure injection pump of the present application;

[0029] Figure 3 This is an exploded schematic diagram of the impeller mechanism, pressure regulating mechanism 1, pressure regulating mechanism 2 and the main body of the rotating shaft of the rotor structure of the low-pressure injection pump of the present application;

[0030] Figure 4 A cross-sectional isometric diagram of a pressure regulating mechanism of a rotor structure of a low-pressure injection pump of the present application;

[0031] Figure 5 This is an axonometric diagram of the impeller mechanism of the rotor structure of the low-pressure injection pump of the present application;

[0032] Figure 6 This is a schematic cross-sectional isometric diagram of the end portion of the rotating shaft body of the rotor structure of the low-pressure injection pump of the present application.

[0033] Reference numerals: 1. rotating shaft body;

[0034] 2. Impeller mechanism; 21. Impeller; 22. Piston rod 1; 23. Sealing ring 1; 24. Limiting ring; 25. Mounting seat;

[0035] 3. Pressure regulating mechanism 1; 31. Countersunk bolt; 32. T-shaped column; 33. T-shaped slot; 34. Piston column 2; 35. Sealing ring 2;

[0036] 4. Main oil channel; 5. Side oil channel; 6. Pressure regulating channel;

[0037] 7. Pressure regulating mechanism 2;

[0038] 8. Mounting groove; 9. Retaining ring; 10. Scale. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-6 This application is described in further detail.

[0040] The embodiment of the present application discloses a rotor structure of a low-pressure injection pump.

[0041] Example 1

[0042] Reference Figure 1 A rotor structure of a low-pressure injection pump includes a shaft body 1. The other parts of the shaft body 1 are the same as those of the above-mentioned cited patent and will not be described in detail in this case. An impeller mechanism 2 is arranged in an equally divided array on the surface of the shaft body 1. A pressure regulating mechanism 2 7 and a pressure regulating mechanism 1 3 for adjusting the oil pressure are respectively arranged on the upper end of the surface of the shaft body 1 from top to bottom. The pressure regulating mechanism 2 7 and the pressure regulating mechanism 1 3 have the same structural dimensions.

[0043] Through the above-mentioned arrangement, the impeller mechanism 2 can realize the basic functions of the injection pump. At the same time, the set pressure regulating mechanism 2 7 and the pressure regulating mechanism 1 3 can adjust the gap of the impeller mechanism 2, thereby enabling the normal operation of the injection pump and increasing the accuracy between the impeller 21 and the casing when the injection pump is assembled.

[0044] Reference Figure 1 , 2 , 3, 5, a circular main oil channel 4 for storing hydraulic oil is provided in the middle of the inner cavity of the shaft body 1, and the main oil channel 4 extends to both ends of the shaft body 1; the impeller mechanism 2 includes a piston column 22 movably inserted in the circular side oil channel 5 on the inner side of the shaft body 1, and the side oil channel 5 is arranged on the inner side of the shaft body 1 in an array of equal parts from top to bottom. The side oil channel 5 is connected with the main oil channel 4 so that the oil in the main oil channel 4 and the oil in the side oil channel 5 push the piston column 22 to move, and the outer side of the shaft body 1 is provided with mounting grooves 8 in an array of equal parts, and the mounting grooves 8 are connected with the side oil channel 5.

[0045] Through the above arrangement, the main oil channel 4 and the side oil channel 5 are filled with hydraulic oil and have no air inside. Therefore, when the hydraulic oil in the main oil channel 4 changes, it will directly affect the hydraulic oil in the side oil channel 5, thereby allowing the piston column 22 to move in real time.

[0046] Reference Figure 1 , 2 , 3, 6, the impeller mechanism 2 also includes a limit ring 24 integrally formed and fixedly arranged in the middle of the outer surface of the piston column 22, and sliders are symmetrically integrally formed and fixedly arranged on both sides of the surface of the limit ring 24, and a retaining ring 9 is integrally formed and fixedly arranged in the middle of the mounting groove 8, and a through hole is opened in the middle of the retaining ring 9 for one end of the piston column 22 to pass through, and the inner wall of the through hole is precisely matched with the surface of the piston column 22 to achieve sealing, and the limit ring 24 is movably arranged between one end face of the retaining ring 9 and the bottom of the inner cavity of the mounting groove 8. Under normal circumstances, space for the limit ring 24 to move horizontally is reserved between the two side surfaces of the limit ring 24 and one end face of the retaining ring 9 and the bottom of the inner cavity of the mounting groove 8, and limit grooves for the two sides of the surface of the limit ring 24 to slide are opened on both sides of the space, and the length of the limit groove is equal to the length of the space, and the three surfaces of the slider abut against the three surfaces of the limit groove and can slide (not shown in the figure).

[0047] Through the above-mentioned arrangement, when the piston column 22 is pushed by the hydraulic oil in the side oil channel 5, the limit ring 24 can be driven to move slowly in the space between the end face of the retaining ring 9 and the bottom of the inner cavity of the mounting groove 8. At the same time, the slider is moved in the limit groove to prevent the mounting seat 25 from rotating. Because the mounting seat 25 and the retaining ring 9 are in a separated and non-fixed state when the piston column 22 moves, the slider and the limit groove need to cooperate to keep the impeller 21 in the specified correct state at all times, which mainly plays a limiting effect. It should be noted that the space size reserved at both ends of the limit ring 24 is set to millimeters. The specific size is related to the volume of the injection pump and needs to be customized according to the volume. At the same time, the retaining ring 9 can limit the movement of the limit ring 24 to avoid excessive movement, which causes the impeller 21 to be pressed against the casing and causes unnecessary wear that affects the use of the injection pump.

[0048] Reference Figure 5 , a mounting seat 25 is fixedly arranged on the side of the piston column 22 located outside, and the middle part of one end of the mounting seat 25 is welded and fixed to the mounting end of the impeller 21, and the welding part is smoothed. It should be noted that even if the retaining ring 9 abuts against the limiting ring 24, the mounting seat 25 is still located in the mounting groove 8 as a whole, so as to avoid the mounting seat 25 protruding from the surface of the rotating shaft body 1 and affecting the fluid flow, thereby aggravating the cavitation of the impeller 21. The surface of one end of the piston column 22 located in the side oil passage 5 is sleeved with a plurality of sealing rings 23, and the outer surfaces of the plurality of sealing rings 23 abut against the inner wall of the side oil passage 5 and realize sealing. The design of the sealing ring 1 23 and the sealing ring 2 35 effectively avoids oil leakage in the gap of the device while ensuring the oil pressure inside the main oil passage 4. The sealing method can also adopt the sealing method of the existing hydraulic cylinder. The mounting seat 25 is located in the mounting groove 8 as a whole, and the mounting seat 25 is located on one end face of the retaining ring 9 and abuts against the surface of the retaining ring 9 to reduce the assembly gap.

[0049] Reference Figure 1 , 2, 3, 4, 6, two pressure regulating channels 6 are respectively provided on the upper end of the surface of the shaft body 1 from top to bottom, and the two pressure regulating channels 6 are both connected to the main oil channel 4, and the two pressure regulating channels 6 pass through the side wall of the shaft body 1, and the inner wall of the pressure regulating channel 6 on the outer side is etched with a scale 10, and the unit of the scale 10 is set to millimeters or microns, and the plane on the outer side of the pressure regulating channel 6 that is flush with the head end face of the countersunk bolt 31 is the starting point of the scale 10, and the starting point and the outer side of the pressure regulating channel 6 are also provided with readings, so as to facilitate the reading of the moving distance of the impeller 21, and the pressure regulating mechanism 1 3 includes a piston column 2 34 movably plugged into the pressure regulating channel 6 located at half of the main oil channel 4, and a plurality of sealing rings are sleeved on both ends of the surface of the piston column 2 34 2 35, the outer surfaces of several sealing rings 2 35 abut against and seal against the inner wall of the pressure regulating channel 6. It should be noted that due to the long length of the piston column 2 34, multiple sealing rings 2 35 are fixed on both ends to achieve balance and prevent the piston column 2 34 from tilting. The pressure regulating channel 6 is provided with a thread on the outside side, and the thread is fixed with the thread of the rod of the countersunk bolt 31. The countersunk bolt 31 is located in the middle of one side of the piston column 2 34 and a T-shaped column 32 is fixed. The piston column 2 34 is located in the middle of one side of the countersunk bolt 31 and a T-shaped slot 33 is provided. One end of the T-shaped column 32 is located in the T-shaped slot 33 and rotates and limits the position. The end face of the rod of the countersunk bolt 31 abuts against the end face of the piston column 2 34 and rotates. The upper end of the inner part of the pressure regulating channel 6 located at the upper end of the shaft body 1 is flush with the upper end of the main oil channel 4 (such as Figure 2 shown).

[0050] Through the above arrangement, both the pressure regulating mechanism 1 3 and the pressure regulating mechanism 2 7 can seal the main oil channel 4. At the same time, one of the two pressure regulating channels 6 can be used for exhaust and the other for oil filling. Before oil filling, the shaft body is Figure 1 Placement, first the construction personnel slowly inject the hydraulic oil into the main oil channel 4 through the oil filling pipe. If the injection is too fast, more air will enter and increase the difficulty of exhaust. When the hydraulic oil fills the pressure regulating channel 6 and the side oil channel 5, the hydraulic oil will slowly gather and rise in the main oil channel 4. Slow injection can discharge the air inside the main oil channel 4 from the pressure regulating channel 6 at the lower end;

[0051] When the hydraulic oil overflows the pressure regulating channel 6 at the lower end, the construction personnel insert the piston column 2 34 of the pressure regulating mechanism 1 3 into the pressure regulating channel 6 at the lower end and then fix it with the countersunk bolt 31 through the thread of the pressure regulating channel 6 at the lower end to seal the pressure regulating channel 6 at the lower end. Then the user continues to slowly inject hydraulic oil. Because the upper end of the pressure regulating channel 6 at the upper end is flush with the upper end of the main oil channel 4, the hydraulic oil will first overflow the lower end of the inner cavity of the pressure regulating channel 6. At this time, in order to fill the main oil channel 4 completely, the shaft body 1 should be slowly tilted, and the hydraulic oil should be continuously injected during the tilting process until the hydraulic oil completely fills the main oil channel 4. Then the pressure regulating mechanism 2 7 is installed in the same way as the pressure regulating mechanism 1 3 to seal the pressure regulating channel 6 at the upper end. It should be noted that after the injection process, there should be no air in the main oil channel 4. Because air is compressible, it will affect the adjustment accuracy of the impeller 21. At the same time, the hydraulic oil uses an oil with good compression resistance.

[0052] Because the hydraulic oil is completely filled and the compressibility of the hydraulic oil is low, the piston rod 22 is firmly fixed in the side oil channel 5 under the action of pressure, thereby making the impeller 21 more stable.

[0053] If there is a better way to fill the side oil channel 5, the pressure regulating channel 6 and the main oil channel 4 with hydraulic oil, it can also be used, not limited to the one method listed in this case.

[0054] The implementation principle of the rotor structure of a low-pressure injection pump in the embodiment of the present application is:

[0055] Before using the device, first install multiple impeller mechanisms 2 in the side oil passage 5 on the surface of the rotating shaft and seal it. Then use an external oil injection machine to fill the side oil passage 5, the pressure regulating passage 6 and the main oil passage 4 with hydraulic oil and remove the air. Then, screw the pressure regulating mechanism 1 3 and the pressure regulating mechanism 2 7 into the two pressure regulating passages 6.

[0056] When the impeller 21 needs to be adjusted, the user can adjust either the pressure regulating mechanism 1 3 or the pressure regulating mechanism 2 7. First, the countersunk bolt 31 of the pressure regulating mechanism 3 is rotated by a hexagonal tool. The countersunk bolt 31 moves laterally under the action of the thread, and the T-shaped column 32 of the countersunk bolt 31 rotates in the T-shaped groove 33 and drives the piston column 2 34 to move laterally. Because the hydraulic oil is completely filled, the piston column 22 can be subjected to force transmission under the action of pressure, so that the piston column 22 moves in the side oil channel 5. The piston column 22 drives the sliders on both sides of the limit ring 24 to slide in the limit groove, and the limit ring 24 can be moved through the space reserved at the bottom of the retaining ring 9 and the mounting groove 8, and then the impeller 21 is driven to move through the mounting seat 25. The gap between the impeller 21 and the inner wall of the casing can be changed by the forward and reverse rotation of the countersunk bolt 31, and then the gap of the impeller 21 can be adjusted after the injection pump is assembled.

[0057] When the countersunk bolt 31 rotates and moves, it will move on the surface of the scale 10. The distance moved by the impeller 21 can be obtained by remembering the distance moved by the countersunk bolt 31 on the scale 10. Therefore, the moving distance of the countersunk bolt 31 and the moving distance of the impeller 21 need to match.

[0058] In summary, when the impeller end is worn and the rotor is installed, the gap between the impeller and the pump casing can be adjusted by the pressure regulating mechanism 1 3 and the pressure regulating mechanism 2 7, thereby improving the assembly accuracy of the injection pump.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor structure of a low-pressure injection pump, characterized in that: It comprises a rotating shaft body (1), and an impeller mechanism (2) arranged in an equally divided array around the surface of the rotating shaft body (1), and a second pressure regulating mechanism (7) and a first pressure regulating mechanism (3) for adjusting the oil pressure are respectively arranged on the upper end of the surface of the rotating shaft body (1) from top to bottom, and the second pressure regulating mechanism (7) and the first pressure regulating mechanism (3) have the same structural dimensions; A main oil passage (4) for storing hydraulic oil is provided in the middle of the inner cavity of the rotating shaft body (1); The impeller mechanism (2) comprises a piston column (22) movably inserted into a side oil passage (5) on the surface of a rotating shaft body (1); the side oil passage (5) is connected to a main oil passage (4); a mounting seat (25) for mounting an impeller (21) is fixedly provided on the side of the piston column (22) located outside; and a plurality of sealing rings (23) are sleeved on the surface of one end of the piston column (22) located on the side oil passage (5) and abut against the inner wall of the side oil passage (5) to achieve sealing.

2. The rotor structure of a low-pressure injection pump according to claim 1 is characterized in that: The side oil passages (5) are arranged in an equally divided array on the inner side of the rotating shaft body (1), and the outer side of the rotating shaft body (1) is provided with mounting grooves (8) in an equally divided array and connected to the side oil passages (5), and a retaining ring (9) is fixed in the middle of the mounting groove (8).

3. The rotor structure of a low-pressure injection pump according to claim 2 is characterized in that: The impeller mechanism (2) further comprises a limiting ring (24) fixedly arranged in the middle of the outer surface of the piston column (22), wherein the limiting ring (24) is located between the retaining ring (9) and the bottom of the inner cavity of the mounting groove (8).

4. The rotor structure of a low-pressure injection pump according to claim 1 is characterized in that: Space for the limiting ring (24) to move is reserved between the two side surfaces of the limiting ring (24) and the retaining ring (9) and the bottom of the inner cavity of the installation groove (8).

5. The rotor structure of a low-pressure injection pump according to claim 4 is characterized in that: The outer periphery of the surface of the mounting seat (25) is threadedly fixed to the retaining ring (9) by bolts, thereby fixing the impeller (21).

6. The rotor structure of a low-pressure injection pump according to claim 1, characterized in that: Two pressure regulating channels (6) communicating with the main oil channel (4) are respectively provided on the upper end of the surface of the rotating shaft body (1) from top to bottom, and the inner wall of the pressure regulating channel (6) located on the outer side is etched with scales (10).

7. The rotor structure of a low-pressure injection pump according to claim 1, characterized in that: The pressure regulating mechanism (3) comprises a piston column (34) movably plugged into the pressure regulating channel (6) located at the half of the main oil channel (4), and both ends of the surface of the piston column (34) are sleeved with a sealing ring (35) that abuts against and seals the inner wall of the pressure regulating channel (6).

8. The rotor structure of a low-pressure injection pump according to claim 7, characterized in that: The pressure regulating channel (6) is located on the outer side and is threadedly fixed to the countersunk bolt (31); the countersunk bolt (31) is located in the middle of one side of the piston column (34) and is fixed with a T-shaped column (32) rotatably arranged in a T-shaped groove (33) located in the middle of one side of the countersunk bolt (31) and the piston column (34).

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