CN109931839A - Nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment method - Google Patents
Nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment method Download PDFInfo
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- CN109931839A CN109931839A CN201910215857.8A CN201910215857A CN109931839A CN 109931839 A CN109931839 A CN 109931839A CN 201910215857 A CN201910215857 A CN 201910215857A CN 109931839 A CN109931839 A CN 109931839A
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- dial gauge
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Abstract
The present invention relates to a kind of nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment methods, release the total backlash of upper pump shaft with radial watt repeatedly in thrust bearing by upper pump shaft, shift upper pump shaft onto calculating center, keep pump shaft equal with radial watt of circumferential clearance, and it is adjusted by rotation jiggering and whether verifies it also at the center of sealing room, so that it is determined that the correct position of two-direction thrust bearing, the process precision of the two-direction thrust bearing position of process adjustment of the invention is high, it avoids and grinds watt, tile kilning and so on, reduce vibration values, it is fully able to meet design requirement using the core main pump product that the method adjusts, and it is successfully applied to manufacture course of products and high-efficient.
Description
Technical field:
The present invention relates to a kind of nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment methods.
Background technique:
Nuclear power station axle envelope main pump manufactory's general assembly positioning position of bearings is the key that nuclear power station axle envelope main pump operates normally,
Position of bearings deviation is excessive to be will lead to main pump and vibrates appearance situations such as excessive and tile kilning is ground watt, cannot be normal so as to cause core main pump
Operating, there will be severe major accident.Nuclear power station axle envelope main pump manufactory's general assembly positioning position of bearings is in main pump assembly
Critical process and core process, nuclear power station axle envelope main pump manufactory's general assembly position position of bearings for axle envelope core main pump
Production domesticization it is particularly important.The precision that nuclear power station axle envelope main pump manufactory's general assembly positions position of bearings is always international skill
Art problem.Beyond example, the currently used clearance gauge of foreign countries colleague measures radial watt, and above pump shaft exists with the positioning of upper pump shaft gap for the country
The method of two-direction thrust bearing position, the method measure narrow space, and clearance gauge fills in measurement operating difficulties, and clearance gauge is easy to fall,
Clearance gauge can not accurately measure gap, and pump shaft circumferencial direction gap in radial direction may be made uneven, adjust upper pump shaft with it is close
By whole coupling of shaft system when sealing room center, by measuring the method for shafting and seal distance indirectly come positioning bidirectional thrust bearing
Position, since upper pump shaft and seal be not in same plane, if shafting heeling condition, can not accurately reaction double to pushing away
The position of power bearing leads to possible amesiality, radial watt of the two-direction thrust bearing side serious wear of shafting during operation
Or there is tile kilning situation, since upper pump shaft tilts, main thrust watt and secondary thrust bearing shoe valve discontinuity and grind that wound is serious and watt temperature
Excessively high, main pump vibration values are excessive, cannot run well, the inclination of whole shafting, and impeller scratch impeller chimney when operating, lower pump shaft is under
Guide bearing is inclined to a side contacts, leads to lower guide bearing carbocyclic ring side serious wear.
Summary of the invention:
Object of the present invention is to disclose the nuclear power station axle envelope core main pump positioning bidirectional thrust axis that a kind of precision is high, regulated efficiency is high
Hold center adjustment method.A kind of technical solution of the present invention are as follows: nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment
Method, comprising the following steps:
1) complete the assembly of thrust bearing: including pump shaft 1 on component, water conservancy diversion standpipe 2, bearing chamber cap 3, main thrust watt 4,
Thrust disc 5, secondary thrust bearing shoe valve 6, radial watt 7, bearing chamber 8 completed by drawing assembly, and thrust bearing is fitted into motor support base 9
Motor support base 9 and the assembly of pump cover 10 and seal 11 are completed in heart position；
2) the first dial gauge (12), the second dial gauge (13), third dial gauge (14) and the 4th dial gauge (15) is uniformly distributed
It is installed on the measuring point of pump shaft (1) cylindrical surface；
3) it pushes upper pump shaft 1 to movement at the first dial gauge 12, the first dial gauge 12 is made to have enough elasticity with radial watt 7
Contact；
4) 13 indicator of the first 12 second dial gauge of dial gauge is zeroed, pump shaft 1 is moved to 13 direction of the second dial gauge in promotion
It is dynamic, after upper pump shaft 1 is with radial watt 7 generation enough Elastic Contact, write down the change of the first dial gauge 12 and the second dial gauge 13
Change numerical value A, two pieces of table numerical value are answered equal；
5) according to step 3) and step 4), numerical value B, A and B the numerical value phase of third dial gauge 14 and the 4th dial gauge 15 are measured
Deng；
6) 12 direction of the first dial gauge of step 3) pushes upper pump shaft 1, generates the first dial gauge 12 with radial watt 7 enough
Elastic Contact, the first dial gauge 12 and 13 pointer of the second dial gauge are zeroed, to the second dial gauge, 13 side pushes up upper pump
Axis 1, the stopping when the first dial gauge 12 and 13 numerical value of the second dial gauge change into S1, by the first dial gauge 12 and the second dial gauge
13 pointers zero；
S1=A/2
S1: upper pump shaft 1 is radial watt 7 center in 13 direction of the first dial gauge 12 and the second dial gauge
A: upper pump shaft 1 and the radial watt 7 total backlash value on 13 direction of the first dial gauge 12 and the second dial gauge
7) make upper pump shaft 1 in the first dial gauge 12 of 15 step 6) of third dial gauge 14 and the 4th dial gauge according to step 5)
With the mobile S2 in 13 direction of the second dial gauge, third dial gauge 14 and 15 pointer of the 4th dial gauge are zeroed；
S2=B/2
S2: upper pump shaft 1 is radial watt 7 center on 15 direction of third dial gauge 14 and the 4th dial gauge
B: upper pump shaft 1 and the radial watt 7 total backlash value on 15 direction of third dial gauge 14 and the 4th dial gauge
If 8) step 7) causes the numerical value of the first dial gauge 12 and the second dial gauge 13 to change, pump shaft 1 makes the in promotion
One dial gauge 12 and 13 numerical value of the second dial gauge revert to S1；
9) the first dial gauge 12 is readjusted according to step 6) and 13 numerical value of the second dial gauge is S1, keep third dial gauge
14 the 4th dial gauge, 15 pointer is zero, and the first dial gauge 12 and 13 pointer of the second dial gauge are zeroed；
10) third dial gauge 14 is readjusted according to step 7), 15 numerical value of the 4th dial gauge is S2, the first dial gauge of holding
12 and second dial gauge 13 reading be zero, by third dial gauge 14,15 pointer of the 4th dial gauge be zeroed；After adjustment, all hundred
Point table is all satisfied and its reading is zero；This time the adjustment center of upper pump shaft 1 within the bearing is completed, and 1 position of pump shaft is constant in holding,
The 4th dial gauge 15 of third dial gauge 14 monitors reading in the original location；
11) upper 1 center of pump shaft is found on the basis of sealing 11 inner circle of room, pump shaft 1 in rotation installs the 5th dial gauge 16
On the spindle nose of upper pump shaft 1,16 measuring point of the 5th dial gauge is installed on sealing 11 inner circle measuring point of room；
12) upper pump shaft 1 is rotated, the numerical value H fed back by the 5th dial gauge 16 adjusts the position of bearing body, makes pump shaft 1
In rotation, the bounce of opposing seal room finally meets technical requirements；
H≤0.03mm
Symbol H: jitter values when upper pump shaft rotation relative to sealing room
13) standard fastening bolt fixing bearing chambers 8 are used by design requirement；
14) step sequence 12 is repeated again) and step 13), when numerical value meets technical requirements, that is, complete Bidirectional pulling in general assembly
The adjustment of power bearing centre, can be completed the positioning of two-direction thrust bearing Yu motor support base 9.
The technology of the present invention effect:
Two-direction thrust bearing is to need just to can determine that by the data point reuse after assembly when main pump manufactory manufactures and assembles
The installation site of two-direction thrust bearing, the position of two-direction thrust bearing determines in the present invention, first has to for upper pump shaft to be adjusted to double
Then as an entirety, upper pump shaft are regarded two-direction thrust bearing and upper pump shaft in radial watt of axial thrust bearing of theoretical center position
Regard radial watt of center circle as, then in such a way that upper pump shaft rotates, upper pump shaft is adjusted to the center of seal, i.e. Bidirectional pulling
Power bearing is adjusted to coaxial with seal, i.e., made by way of datum tool radial watt of two-direction thrust bearing by upper pump shaft
Transmitting and lower guide bearing with seal is coaxial, also makes main pump rotatable parts respectively at the center on radial watt of top and lower guide bearing
Position, thus located the position of two-direction thrust bearing,
Upper pump shaft is first released the total backlash of bearing shell and the diameter of axle by the use of the invention repeatedly in thrust bearing, will
Upper pump shaft shifts calculating center onto, keeps pump shaft equal with radial watt of circumferential clearance, and is tested by rotating upper pump shaft to adjust
It is demonstrate,proved whether also in the center of sealing room, the shape of shafting when the method for pump shaft can simulate main pump real-world operation in this rotation
State, so that it is determined that the correct position of thrust bearing, the advantages of such process, has been can avoid because upper pump shaft is in radial direction first
Middle circumferencial direction gap is uneven, during operation or amesiality and lead to radial watt of thrust bearing side serious wear or go out
Now tile kilning situation, while upper pump shaft inclination and main thrust watt and secondary thrust bearing shoe valve discontinuity will not occur and lead to grind wound sternly
Weight and the excessively high situation of watt temperature, generation the case where impeller scratch impeller chimney when reducing main pump vibration values and operating, second this
Kind method intuitively can accurately show the numerical value for pushing upper pump shaft, more accurate relative to clearance gauge measurement gap, because in upper pump
Axis and radial watt of gap make annulus, and clearance gauge is plane, and it is accurate on circular arc that the clearance gauge of plane can accurately not measure
Numerical value can be monitored in real time in gap, this method of third, avoids measuring inaccurate gap width because of upper pump shaft movement, such as
The first dial gauge of pump shaft and when the second percentage apparent bearing in promotion, third dial gauge and the 4th percentage apparent bearing are real-time monitorings
, the numerical value for preventing the movement that cannot find third dial gauge and the 4th percentage apparent bearing and generating is inaccurate, the 4th such side
Method increases the verifying sequence of 9 sequence 10 of sequence, can further check the accuracy in gap, and the 5th such method is easy to operate, avoids
The position of clearance gauge measurement narrow space and the operating difficulties generated, so as to cause measurement data inaccuracy, such method has been
Using four bearing axle envelope core main pump manufactory general assembly positioning bidirectional bearing of nuclear power station.
Detailed description of the invention:
Fig. 1 component locations schematic diagram
Pump shaft dial gauge position view on Fig. 2
Specific embodiment:
When axle envelope main pump assembles for the first time in manufactory, at no determining two-direction thrust bearing center, by upper
During pump shaft pushes away, pump shaft in rotation, according to the reading that the dial gauge on upper pump shaft is surveyed in seal inner wall, to adjust bidirectional propulsion
Bearing makes two-direction thrust bearing meet the position of service requirement in center.
A kind of nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment method, comprising the following steps:
1) assembly of thrust bearing is completed: as shown in Figure 1, including pump shaft 1 on component, water conservancy diversion standpipe 2, bearing chamber cap 3, master
Thrust bearing shoe valve 4, thrust disc 5, secondary thrust bearing shoe valve 6, radial watt 7, bearing chamber 8 completed by drawing assembly, and thrust bearing is packed into motor
Motor support base 9 and the assembly of pump cover 10 and seal 11 are completed in the center of support 9；
2) the first dial gauge (12), the second dial gauge (13), third dial gauge (14) and the 4th dial gauge (15) is uniformly distributed
It is installed on the measuring point of pump shaft (1) cylindrical surface；
3) it pushes upper pump shaft 1 to movement at the first dial gauge 12, the first dial gauge 12 is made to have enough elasticity with radial watt 7
Contact；
4) 13 indicator of the first 12 second dial gauge of dial gauge is zeroed, pump shaft 1 is moved to 13 direction of the second dial gauge in promotion
It is dynamic, after upper pump shaft 1 is with radial watt 7 generation enough Elastic Contact, write down the change of the first dial gauge 12 and the second dial gauge 13
Change numerical value A, two pieces of table numerical value are answered equal；
5) according to step 3) and step 4), numerical value B, A and B the numerical value phase of third dial gauge 14 and the 4th dial gauge 15 are measured
Deng；
6) as shown in Figure 1,12 direction of the first dial gauge of step 3) pushes upper pump shaft 1, make the first dial gauge 12 and radial direction
Watts 7 generate enough Elastic Contacts, by the first dial gauge 12 and 13 pointer of the second dial gauge zero, to 13 direction of the second dial gauge
Pump shaft 1 in upper promotion, the stopping when the first dial gauge 12 and 13 numerical value of the second dial gauge change into S1, by the first dial gauge 12 with
Second dial gauge, 13 pointer zero；
S1=A/2
S1: upper pump shaft 1 is radial watt 7 center in 13 direction of the first dial gauge 12 and the second dial gauge
A: upper pump shaft 1 and the radial watt 7 total backlash value on 13 direction of the first dial gauge 12 and the second dial gauge
7) as shown in Fig. 2, making upper pump shaft 1 the of 15 step 6) of third dial gauge 14 and the 4th dial gauge according to step 5)
One dial gauge 12 and the mobile S2 in 13 direction of the second dial gauge, third dial gauge 14 and 15 pointer of the 4th dial gauge are zeroed；
S2=B/2
S2: upper pump shaft 1 is radial watt 7 center on 15 direction of third dial gauge 14 and the 4th dial gauge
B: upper pump shaft 1 and the radial watt 7 total backlash value on 15 direction of third dial gauge 14 and the 4th dial gauge
If 8) step 7) causes the numerical value of the first dial gauge 12 and the second dial gauge 13 to change, pump shaft 1 makes the in promotion
One dial gauge 12 and 13 numerical value of the second dial gauge revert to S1；
9) the first dial gauge 12 is readjusted according to step 6) and 13 numerical value of the second dial gauge is S1, keep third dial gauge
14 the 4th dial gauge, 15 pointer is zero, and the first dial gauge 12 and 13 pointer of the second dial gauge are zeroed；
10) as shown in Fig. 2, readjusting third dial gauge 14 according to step 7), 15 numerical value of the 4th dial gauge is S2, holding
First dial gauge 12 and the second dial gauge 13 reading are zero, and third dial gauge 14,15 pointer of the 4th dial gauge are zeroed；Adjustment
Afterwards, all dial gauges are all satisfied and its reading is zero；This time the adjustment center of upper pump shaft 1 within the bearing is completed, and is pumped in holding
1 position of axis is constant, and the 4th dial gauge 15 of third dial gauge 14 monitors reading in the original location；
11) upper 1 center of pump shaft is found on the basis of sealing 11 inner circle of room, pump shaft 1 in rotation installs the 5th dial gauge 16
On the spindle nose of upper pump shaft 1,16 measuring point of the 5th dial gauge is installed on sealing 11 inner circle measuring point of room；
12) upper pump shaft 1 is rotated, the numerical value H fed back by the 5th dial gauge 16 adjusts the position of bearing body, makes pump shaft 1
In rotation, the bounce of opposing seal room finally meets technical requirements；
H≤0.03mm
Symbol H: jitter values when upper pump shaft rotation relative to sealing room
13) standard fastening bolt fixing bearing chambers 8 are used by design requirement；
14) step sequence 12 is repeated again) and step 13), when numerical value meets technical requirements, that is, complete Bidirectional pulling in general assembly
The adjustment of power bearing centre, can be completed the positioning of two-direction thrust bearing Yu motor support base 9.
Claims (1)
1. a kind of nuclear power station axle envelope core main pump positioning bidirectional thrust bearing center adjustment method, it is characterized in that: the following steps are included:
1) assembly of thrust bearing is completed: including pump shaft on component (1), water conservancy diversion standpipe (2), bearing chamber cap (3), main thrust watt
(4), thrust disc (5), secondary thrust bearing shoe valve (6), radial watt (7), bearing chamber (8) completed by drawing assembly, and thrust bearing is packed into
Motor support base (9) and pump cover (10) and seal (11) assembly are completed in the center of motor support base (9)；
2) the first dial gauge (12), the second dial gauge (13), third dial gauge (14) and the 4th dial gauge (15) are uniformly installed
Onto upper pump shaft (1) cylindrical surface measuring point；
3) it pushes upper pump shaft (1) to movement at the first dial gauge (12), has the first dial gauge (12) and radial watt (7) enough
Elastic Contact；
4) (12) second dial gauge (13) indicator of the first dial gauge is zeroed, pump shaft (1) is square to the second dial gauge (13) in promotion
The first dial gauge (12) and the 200th are write down behind upper pump shaft (1) and radial watt (7) generation enough Elastic Contact to movement
Divide the variation numerical value A of table (13), two pieces of table numerical value are answered equal；
5) according to step 3) and step 4), numerical value B, A and B the numerical value phase of third dial gauge (14) Yu the 4th dial gauge (15) are measured
Deng；
6) the first dial gauge (12) direction of step 3) pushes upper pump shaft (1), generates the first dial gauge (12) with radial watt (7)
First dial gauge (12) and the second dial gauge (13) pointer are zeroed, to the second dial gauge (13) direction by enough Elastic Contacts
Pump shaft (1) in upper promotion, the stopping when the first dial gauge (12) change into S1 with the second dial gauge (13) numerical value, by the first percentage
Table (12) and the second dial gauge (13) pointer are zeroed；
S1=A/2
S1: upper pump shaft (1) radial watt (7) the first dial gauge (12) and the second dial gauge (13) direction center
A: upper pump shaft (1) and radial watt (7) the total backlash value on the first dial gauge (12) and the second dial gauge (13) direction
7) make upper pump shaft (1) in the first dial gauge of third dial gauge (14) and the 4th dial gauge (15) step 6) according to step 5)
(12) with the mobile S2 in the second dial gauge (13) direction, third dial gauge (14) and the 4th dial gauge (15) pointer are zeroed；
S2=B/2
S2: the center of upper pump shaft (1) radial watt (7) on third dial gauge (14) and the 4th dial gauge (15) direction
B: upper pump shaft (1) and radial watt (7) the total backlash value on third dial gauge (14) and the 4th dial gauge (15) direction
8) if step 7) causes the numerical value of the first dial gauge (12) and the second dial gauge (13) to change, pump shaft (1) makes in promotion
First dial gauge (12) and the second dial gauge (13) numerical value revert to S1；
9) the first dial gauge (12) are readjusted according to step 6) and the second dial gauge (13) numerical value is S1, keep third dial gauge
(14) the 4th dial gauge (15) pointers are zero, and the first dial gauge (12) and the second dial gauge (13) pointer are zeroed；
10) third dial gauge (14) are readjusted according to step 7), the 4th dial gauge (15) numerical value is S2, the first dial gauge of holding
(12) it is zero with the second dial gauge (13) reading, third dial gauge (14), the 4th dial gauge (15) pointer is zeroed；After adjustment,
All dial gauges are all satisfied and its reading is zero；This time the adjustment center of upper pump shaft (1) within the bearing is completed, pump shaft in holding
(1) position is constant, and the 4th dial gauge (15) of third dial gauge (14) monitors reading in the original location；
11) upper pump shaft (1) center, pump shaft (1) in rotation, by the 5th dial gauge (16) are found on the basis of sealing room (11) inner circle
It is mounted on the spindle nose of pump shaft (1), the 5th dial gauge (16) measuring point is installed on sealing room (11) inner circle measuring point；
12) it rotates upper pump shaft (1), the numerical value H fed back by the 5th dial gauge (16) adjusts the position of bearing body, makes pump shaft
(1) in rotation, the bounce of opposing seal room finally meets technical requirements；
H≤0.03mm
Symbol H: jitter values when upper pump shaft rotation relative to sealing room
13) standard fastening bolt fixing bearing chambers (8) are used by design requirement；
14) step sequence 12 is repeated again) and step 13), when numerical value meets technical requirements, that is, complete bidirectional propulsion axis in general assembly
Center adjustment is held, the positioning of two-direction thrust bearing Yu motor support base (9) can be completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215857.8A CN109931839B (en) | 2019-03-21 | 2019-03-21 | Center adjusting method for shaft seal nuclear main pump positioning bidirectional thrust bearing of nuclear power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910215857.8A CN109931839B (en) | 2019-03-21 | 2019-03-21 | Center adjusting method for shaft seal nuclear main pump positioning bidirectional thrust bearing of nuclear power station |
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| Publication Number | Publication Date |
|---|---|
| CN109931839A true CN109931839A (en) | 2019-06-25 |
| CN109931839B CN109931839B (en) | 2020-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910215857.8A Active CN109931839B (en) | 2019-03-21 | 2019-03-21 | Center adjusting method for shaft seal nuclear main pump positioning bidirectional thrust bearing of nuclear power station |
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Cited By (7)
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|---|---|---|---|---|
| CN110842503A (en) * | 2019-11-19 | 2020-02-28 | 上海机床厂有限公司 | Tool and method for assembling three-tile dynamic pressure bearing |
| CN111022312A (en) * | 2019-12-18 | 2020-04-17 | 沈阳鼓风机集团核电泵业有限公司 | Axial thrust monitoring device for reactor coolant pump |
| CN112496789A (en) * | 2020-11-23 | 2021-03-16 | 哈尔滨电气动力装备有限公司 | Mounting and adjusting process before reaming of nuclear main pump drill |
| CN113339313A (en) * | 2021-07-08 | 2021-09-03 | 哈尔滨电气动力装备有限公司 | Centrifugal adjusting method for odd asymmetric radial tile gaps of shaft seal type nuclear main pump |
| CN113532769A (en) * | 2021-07-05 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Nuclear power station nuclear main pump seal chamber water pressure experiment method |
| CN113524106A (en) * | 2021-07-08 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Radial tile tool installation process |
| CN114412838A (en) * | 2021-12-15 | 2022-04-29 | 西安航天泵业有限公司 | Method for assembling low-temperature barrel bag pump of ethylene device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110842503A (en) * | 2019-11-19 | 2020-02-28 | 上海机床厂有限公司 | Tool and method for assembling three-tile dynamic pressure bearing |
| CN111022312A (en) * | 2019-12-18 | 2020-04-17 | 沈阳鼓风机集团核电泵业有限公司 | Axial thrust monitoring device for reactor coolant pump |
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| CN112496789B (en) * | 2020-11-23 | 2022-03-15 | 哈尔滨电气动力装备有限公司 | Mounting and adjusting process before reaming of nuclear main pump drill |
| CN113532769A (en) * | 2021-07-05 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Nuclear power station nuclear main pump seal chamber water pressure experiment method |
| CN113532769B (en) * | 2021-07-05 | 2022-11-25 | 哈尔滨电气动力装备有限公司 | Nuclear power station nuclear main pump seal chamber water pressure experiment method |
| CN113339313A (en) * | 2021-07-08 | 2021-09-03 | 哈尔滨电气动力装备有限公司 | Centrifugal adjusting method for odd asymmetric radial tile gaps of shaft seal type nuclear main pump |
| CN113524106A (en) * | 2021-07-08 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Radial tile tool installation process |
| CN113339313B (en) * | 2021-07-08 | 2022-07-22 | 哈尔滨电气动力装备有限公司 | Centrifugal adjusting method for odd asymmetric radial tile gaps of shaft seal type nuclear main pump |
| CN114412838A (en) * | 2021-12-15 | 2022-04-29 | 西安航天泵业有限公司 | Method for assembling low-temperature barrel bag pump of ethylene device |
| CN114412838B (en) * | 2021-12-15 | 2023-12-01 | 西安航天泵业有限公司 | Ethylene device low-temperature cylindrical bag pump assembly method |
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