CN216788726U - Canned motor pump axial force testing arrangement - Google Patents
Canned motor pump axial force testing arrangement Download PDFInfo
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- CN216788726U CN216788726U CN202122188171.XU CN202122188171U CN216788726U CN 216788726 U CN216788726 U CN 216788726U CN 202122188171 U CN202122188171 U CN 202122188171U CN 216788726 U CN216788726 U CN 216788726U
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- dowel bar
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Abstract
The utility model relates to a canned motor pump axial force testing device which comprises a pump shaft supporting mechanism, an axial force transmission mechanism, a magnetic fluid sealing mechanism and an axial force testing mechanism. The axial force transmission mechanism comprises a rotating dowel bar and an axial force dowel bar which are sequentially and axially connected with the end part of the pump shaft, and a rolling bearing arranged between the rotating dowel bar and the axial force dowel bar; the magnetic fluid sealing mechanism comprises a sealing sleeve sleeved on the extending end of the axial force dowel bar, a magnetic pole and a magnet which are arranged on the inner wall of the sealing sleeve and mutually abutted, and a magnetic fluid arranged between the magnetic pole and the axial force dowel bar; the axial force testing mechanism comprises a tension and compression stress sensor axially connected with the axial force dowel bar. Compared with the prior art, the utility model has the advantages of simple structure, convenient operation, accurate measurement, automatic data acquisition and the like, and can effectively ensure the operational reliability of the shield pump in the test process, thereby ensuring that the obtained data has better reference value.
Description
Technical Field
The utility model belongs to the technical field of pump axial force testing, and relates to a shielding pump axial force testing device.
Background
At present, the shield pump is more and more widely applied to the industries of chemical industry, medicine, aviation, nuclear power and the like due to the characteristic of no leakage, and the requirement on the working reliability of the shield pump is higher and higher. An important index for measuring the working reliability of the shield pump is the fault-free operation time which mainly depends on the service life of the bearing friction pair, and the strict control of the axial thrust is the key for prolonging the service life of the bearing friction pair. In the past production process, most of the shield pump shaft thrust is determined by means of theoretical calculation and operation experience, and data cannot be accurately detected. Later, a testing device as shown in figure 1 is adopted, a force transmission mechanism is connected with a rear shaft head of the canned motor pump, the other end of the force transmission mechanism is sealed by an O-shaped sealing ring and led out of a motor cavity, a spring scale is used for measuring, and if the axial thrust is large, a fulcrum is required to be arranged, and the lever is used for measuring. Because the friction force generated by the O-shaped sealing ring cannot be determined, the precision of the spring scale is not high, one end of the force transmission mechanism extends out of the motor cavity, and the pressure at the rear shaft head needs to be measured for conversion, the testing device is troublesome to operate, and the measured data are inaccurate.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide the canned motor pump axial force testing device which is simple in structure, convenient to operate, accurate in measurement, capable of automatically acquiring data and capable of ensuring the operational reliability of the canned motor pump.
The purpose of the utility model can be realized by the following technical scheme:
a canned motor pump axial force testing arrangement includes
The pump shaft supporting mechanism comprises a replacement pump cover fixedly connected with the shield pump stator assembly and a replacement bearing assembly arranged on the replacement pump cover and sleeved at the end part of the pump shaft;
the axial force transmission mechanism comprises a rotating dowel bar and an axial force dowel bar which are sequentially and axially connected with the end part of the pump shaft, a rolling bearing arranged between the rotating dowel bar and the axial force dowel bar, and a force transmission barrel cover which is sleeved outside the rotating dowel bar and the axial force dowel bar and is fixedly connected with the replacement pump cover; one end of the axial force transmission rod extends out of the force transmission barrel cover;
the magnetic fluid sealing mechanism comprises a sealing sleeve sleeved on the extending end of the axial force dowel bar, a magnetic pole and a magnet which are arranged on the inner wall of the sealing sleeve and mutually abutted, and magnetic fluid arranged between the magnetic pole and the axial force dowel bar; one end of the axial force dowel bar extends out of the sealing sleeve;
the axial force testing mechanism comprises a tension-compression stress sensor and a connecting shaft which are sequentially and axially connected with the axial force dowel bar, and a support which is used for supporting the connecting shaft and is fixedly connected with the pump cover.
Furthermore, one end of the rotary dowel bar is in threaded connection with the end part of the pump shaft.
Furthermore, one end of the axial force dowel bar is provided with a force transmission sleeve, one end of the rotary dowel bar is embedded into the force transmission sleeve, and the inner side and the outer side of the rolling bearing are fixedly connected with the embedded end of the rotary dowel bar and the force transmission sleeve respectively.
Furthermore, a bearing retainer ring is embedded in the force transmission sleeve, a sleeve limit stop block is arranged on the inner wall of the force transmission sleeve, a force transmission rod stop block is arranged on the rotating force transmission rod, and an external thread is arranged at the end part of the rotating force transmission rod and sleeved with a locking nut;
the outer side of the rolling bearing is clamped and fixed between the bearing retainer ring and the sleeve limit stop, and the inner side of the rolling bearing is clamped and fixed between the dowel bar stop and the locking nut.
Furthermore, in the magnetic fluid sealing mechanism, 2 magnetic poles are sleeved on the axial force dowel bar in parallel in tandem along the axial direction, and the magnets are clamped and fixed between the 2 magnetic poles.
Furthermore, the outer edge of the magnetic pole is provided with a sealing accommodating groove, and a magnetic pole sealing ring is arranged between the sealing accommodating groove and the sealing sleeve.
Furthermore, a sliding shaft sleeve is arranged between the sealing sleeve and the axial force dowel bar.
Furthermore, a magnetic pole retainer ring is arranged between the sliding shaft sleeve and the magnetic pole.
Furthermore, the axial force testing mechanism also comprises a tension signal converter electrically connected with the tension and compression stress sensor and the external data processor.
Furthermore, a fine adjustment nut is further arranged on the support and is in transmission connection with the connecting shaft in the axial direction.
Compared with the prior art, the utility model has the following characteristics:
1) the magnetic fluid sealing structure is adopted, so that the penetration of the axial force dowel bar is realized, the leakage is avoided, meanwhile, the friction force is extremely small, compared with a sealing ring structure, the influence on the axial force test result can be obviously reduced, and the test precision is improved;
2) the pressure sensing force output part consists of a tension and compression stress sensor and a tension signal converter, one end of the sensor is connected with the axial force dowel bar, the other end of the sensor is connected with the connecting shaft through screw threads, during testing, the shaft of the force transmission mechanism rotates along with the pump shaft of the canned motor pump, the rotation action is eliminated through the rolling bearing, the force transmission sleeve and the axial force testing mechanism are kept stable, at the moment, if the canned motor pump rotor has certain crosstalk amount and generates axial thrust or axial tension to the pump shaft, the axial thrust can be accurately transmitted to the axial force testing mechanism through the axial force dowel bar, the tension and compression sensor accurately senses and bears the acting force, and then the axial thrust or the axial tension is transmitted to a computer through the tension signal converter so as to finish automatic data acquisition;
3) before the test, the pump shaft position can be adjusted through the fine adjustment nut, so that the initial positions of the rotor assembly and the stator assembly are located at the positions specified by technical drawings, the test process has more reference value, and meanwhile, the connecting shaft is also provided with scales to calibrate the position value.
Drawings
FIG. 1 is a schematic structural diagram of a canned motor pump axial force testing device in the prior art;
FIG. 2 is a schematic structural diagram of a canned motor pump equipped with a canned motor pump axial force test device in an embodiment;
FIG. 3 is a schematic structural diagram of an axial force testing device of a canned motor pump according to an embodiment;
the notation in the figure is:
1-replacing a pump cover, 2-axial force transmission rod, 3-rolling bearing, 4-rotating force transmission rod, 5-force transmission barrel cover, 6-force transmission sleeve, 7-bearing retainer ring, 8-locking nut, 9-sealing sleeve, 10-sliding shaft sleeve, 11-magnetic pole retainer ring, 12-magnetic pole, 13-magnet, 14-magnetofluid, 15-gland, 16-magnetic pole sealing ring, 17-tension and compression stress sensor, 18-connecting shaft, 19-fine adjustment nut, 20-bracket and 21-tension signal converter.
Detailed Description
The utility model is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The embodiment is as follows:
as shown in fig. 2 and 3, a canned motor pump axial force testing apparatus includes a pump shaft supporting mechanism, an axial force transmission mechanism, a magnetic fluid sealing mechanism, and an axial force testing mechanism. The pump shaft supporting mechanism comprises a replacement pump cover 1 fixedly connected with the shield pump stator assembly and a replacement bearing assembly arranged on the replacement pump cover 1 and sleeved at the end part of the pump shaft. The replaceable pump cover 1 and the pump cover of the original shield pump have the same structure as the replaceable bearing assembly and the bearing assembly on the original pump cover, so that the original movement and stress state of the pump shaft of the shield pump is guaranteed.
The axial force transfer mechanism comprises a rotating dowel bar 4 and an axial force dowel bar 2 which are sequentially and axially connected with the end part of the pump shaft, a rolling bearing 3 arranged between the rotating dowel bar 4 and the axial force dowel bar 2, and a force transfer barrel cover 5 which is sleeved outside the rotating dowel bar 4 and the axial force dowel bar 2 and is fixedly connected with the replacement pump cover 1. One end of the rotating dowel bar 4 is in threaded connection with the end part of the pump shaft, and the other end of the rotating dowel bar is embedded in a force transmission sleeve 6 at the end part of the axial force dowel bar 2. A bearing retainer ring 7 is embedded in the force transmission sleeve 6, a sleeve limit stop block is arranged on the inner wall of the force transmission sleeve 6, a dowel bar stop block is arranged on the rotary dowel bar 4, an external thread is arranged at the end part of the rotary dowel bar 4, and a locking nut 8 is sleeved on the end part of the rotary dowel bar; the outer side of the rolling bearing 3 is clamped and fixed between the bearing retainer ring 7 and the sleeve limit stop, and the inner side of the rolling bearing is clamped and fixed between the dowel bar stop and the locking nut 8, so that when the rolling bearing 3 eliminates the rotating action of the pump shaft, the axial force can be fully transmitted to the axial force dowel bar 2.
One end of the axial force transmission rod 2 extends out of the force transmission barrel cover 5; the magnetic fluid sealing mechanism comprises a sealing sleeve 9 fixedly connected with the force transmission barrel cover 5 and sleeved on the extending end of the axial force transmission rod 2, a sliding shaft sleeve 10, a magnetic pole retainer ring 11, a magnetic pole 12 and a magnet 13 which are arranged on the inner wall of the sealing sleeve 9 and are symmetrically arranged from two sides to the middle in the axial direction in sequence, and a magnetic fluid 14 arranged between the magnetic pole 12 and the axial force transmission rod 2; one end of the axial force transmission rod 2 extends out of the sealing sleeve 9. In order to ensure the compactness of all parts in the sealing sleeve 9, a gland 15 is also arranged outside the sealing sleeve 9, and the sliding shaft sleeve 10, the magnetic pole retaining ring 11, the magnetic pole 12, the magnet 13, the magnetic pole 12, the magnetic pole retaining ring 11 and the sliding shaft sleeve 10 are sequentially abutted against and pressed by the gland 15. The outer edge of the magnetic pole 12 is also provided with a sealing accommodating groove, and a magnetic pole sealing ring 16 is arranged between the sealing accommodating groove and the sealing sleeve 9. The magnetic pole sealing ring 16 and the magnetic fluid 14 ensure the tightness of the testing device, and the leakage of the conveying fluid in the testing process is avoided.
Meanwhile, a pump cover sealing gasket, a force transmission barrel cover sealing ring and a gland sealing ring are respectively arranged between the replacement pump cover 1 and the stator assembly, between the force transmission barrel cover 5 and the sealing sleeve 9 and between the sealing sleeve 9 and the gland 15, and are respectively compressed and fixed through a pump cover bolt, a barrel cover bolt and a gland bolt, so that the sealing property is further improved.
The axial force testing mechanism comprises a tension and compression stress sensor 17, a connecting shaft 18 and a fine adjustment nut 19 which are sequentially and axially connected with the axial force dowel bar 2, and a support 20 which is used for supporting the fine adjustment nut 19 and is fixedly connected with the pump cover 1. The tension and compression stress sensor 17 is electrically connected with the tension signal converter 21 and an external data processor, namely a computer, in turn, so as to monitor the change condition of the axial force of the shield pump in real time.
The embodiments described above are intended to facilitate the understanding and use of the utility model by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A canned motor pump axial force testing device is characterized in that the device comprises
The pump shaft supporting mechanism comprises a replacement pump cover (1) fixedly connected with the shield pump stator assembly and a replacement bearing assembly arranged on the replacement pump cover (1) and sleeved at the end part of the pump shaft;
the axial force transmission mechanism comprises a rotating dowel bar (4) and an axial force dowel bar (2) which are sequentially and axially connected with the end part of the pump shaft, a rolling bearing (3) arranged between the rotating dowel bar (4) and the axial force dowel bar (2), and a force transmission barrel cover (5) which is sleeved outside the rotating dowel bar (4) and the axial force dowel bar (2) and is fixedly connected with the replacement pump cover (1); one end of the axial force transmission rod (2) extends out of the force transmission barrel cover (5);
the magnetic fluid sealing mechanism comprises a sealing sleeve (9) sleeved on the extending end of the axial force dowel bar (2), a magnetic pole (12) and a magnet (13) which are arranged on the inner wall of the sealing sleeve (9) and mutually abutted, and a magnetic fluid (14) arranged between the magnetic pole (12) and the axial force dowel bar (2); one end of the axial force dowel bar (2) extends out of the sealing sleeve (9);
the axial force testing mechanism comprises a tension-compression stress sensor (17) and a connecting shaft (18) which are sequentially and axially connected with an axial force dowel bar (2), and a support (20) which is used for supporting the connecting shaft (18) and is fixedly connected with a pump cover (1).
2. The canned motor pump axial force test device of claim 1, wherein one end of the rotary dowel bar (4) is in threaded connection with the end of the pump shaft.
3. The shielding pump axial force testing device according to claim 1, wherein a force transmission sleeve (6) is arranged at one end of the axial force dowel bar (2), one end of the rotating dowel bar (4) is embedded into the force transmission sleeve (6), and the inner side and the outer side of the rolling bearing (3) are fixedly connected with the embedded end of the rotating dowel bar (4) and the force transmission sleeve (6) respectively.
4. The canned motor pump axial force testing device of claim 3, wherein a bearing retainer ring (7) is embedded in the force transmission sleeve (6), a sleeve limit stop is arranged on the inner wall of the force transmission sleeve (6), a dowel bar stop is arranged on the rotary dowel bar (4), an external thread is arranged at the end part of the rotary dowel bar (4), and a locking nut (8) is sleeved on the end part of the rotary dowel bar;
the outer side of the rolling bearing (3) is clamped and fixed between a bearing retainer ring (7) and a sleeve limiting stop block, and the inner side of the rolling bearing is clamped and fixed between a dowel bar stop block and a locking nut (8).
5. The canned motor pump axial force testing device of claim 1, characterized in that in the magnetic fluid sealing mechanism, 2 magnetic poles (12) are sleeved in parallel on the axial force dowel bar (2) in tandem along the axial direction, and the magnet (13) is clamped and fixed between the 2 magnetic poles (12).
6. The canned motor pump axial force testing device of claim 1, characterized in that the outer edge of the magnetic pole (12) is provided with a seal accommodating groove, and a magnetic pole sealing ring (16) is arranged between the seal accommodating groove and the sealing sleeve (9).
7. The canned pump axial force testing device of claim 1, wherein a sliding bushing (10) is further disposed between the sealing sleeve (9) and the axial force transmission rod (2).
8. The canned motor pump axial force test device of claim 7, characterized in that a magnetic pole retainer ring (11) is further arranged between the sliding shaft sleeve (10) and the magnetic pole (12).
9. The canned motor pump axial force test device of claim 1, wherein the axial force test mechanism further comprises a tension signal converter (21) electrically connected to the tension/compression stress sensor (17) and an external data processor.
10. The canned motor pump axial force testing device of claim 1, characterized in that, the support (20) is further provided with a fine adjustment nut (19), and the fine adjustment nut (19) is connected with the connecting shaft (18) in an axial transmission manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122188171.XU CN216788726U (en) | 2021-09-10 | 2021-09-10 | Canned motor pump axial force testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122188171.XU CN216788726U (en) | 2021-09-10 | 2021-09-10 | Canned motor pump axial force testing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216788726U true CN216788726U (en) | 2022-06-21 |
Family
ID=81998860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122188171.XU Active CN216788726U (en) | 2021-09-10 | 2021-09-10 | Canned motor pump axial force testing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216788726U (en) |
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2021
- 2021-09-10 CN CN202122188171.XU patent/CN216788726U/en active Active
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