CN202420794U - Novel mechanical seal performance test device - Google Patents
Novel mechanical seal performance test device Download PDFInfo
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- CN202420794U CN202420794U CN2012200535012U CN201220053501U CN202420794U CN 202420794 U CN202420794 U CN 202420794U CN 2012200535012 U CN2012200535012 U CN 2012200535012U CN 201220053501 U CN201220053501 U CN 201220053501U CN 202420794 U CN202420794 U CN 202420794U
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Abstract
A novel mechanical seal performance test device is characterized in that a main shaft penetrates a left end cover and a right end cover on a casing of a sealed cavity; two pairs of tested sealing rings with the same size are mounted at the left and the right ends of the main shaft in the casing of the sealed cavity respectively, and no additional axial force is generated under any testing medium pressure; two sections of threads with equal screw pitch and opposite spiral line directions are machined on a major shaft sleeve in clearance fit with the main shaft; the major shaft sleeve is in clockwise rotation, so as to drive a left nut and a right nut both in screw fit with the major shaft sleeve to equidistantly move to left and right, as a result, a left pressure spring and a right pressure spring are pushed to respectively compress two rotating rings, and the specific pressure born by the two pairs of seal end surfaces on the left and the right are guaranteed to be the same. The two pairs of tested sealing rings with the same size are adopted for testing, the mean value is obtained and taken as a test torque and leakage quantity of the mechanical seal of the model, and the influence that the torque and leakage quantity measurement are inaccurate caused by accidental factors such as installation when only one pair of sealing rings is adopted for testing is reduced.
Description
One, technical field
The utility model belongs to the mechanical seal technical field of measurement and test, and particularly a kind of nothing is added axial force, the novel mechanical sealing property tester that specific pressures such as two seal faces are regulated.
Two, technical background
Mechanical seal has a wide range of applications in fields such as petrochemical industry, electric power, aviations as the axle envelope of equipment dynamic input shafts such as pump, compressor and stirrer.Along with the continuous progress of material science and manufacturing technology, the life-span and the reliability of mechanical seal are greatly improved, but in commercial Application, its inefficacy is still very general.It is long to seek out the life-span, and the mechanical seal of stable performance not only need further be optimized mechanical seal structure on the basis of forefathers' research and designed, and also need develop mechanical sealing performance tester reliable, convenient test simultaneously.
According to the use occasion of mechanical seal, mechanical sealing performance tester mainly is divided into following four types at present: (1) screw shaft of ship is used mechanical seal test device; (2) mechanical seal for pump test unit; (3) agitated reactor is used mechanical seal test device; (4) compressor is used mechanical seal test device.
From known technology, can see; Mechanical sealing performance tester mainly shows as single-cantilever axle and two cantilevered axle on the supporting structure of the power input shaft that seal is installed, power input shaft passes with showing as being connected of annular seal space to penetrate to penetrate with the both sides end cap from one-sided end cap.For single-cantilever shaft type mechanical seal test device, power input shaft penetrates an end cap of annular seal space, and is as shown in Figure 1; Tested mechanical seal is as the seal of cavity, and is close with the scene, but the sealing axle head is in seal chamber; Axle head receives the effect of pressure medium can produce axial force, and seal media of both sides active area does not wait, and can produce axial force yet; And the bearing friction torque that different axial forces cause is different, has influenced the measuring accuracy of end-face friction moment of torsion; For the double cantalever type mechanical seal test device; As shown in Figure 2; The axial force that pressure medium causes at single axle head and do not wait the axial force that causes because of seal media of both sides active area; Understand by its symmetrical structure institute balance, but increased the length of installing, particularly increased the complexity of power input shaft and propulsion system syndeton; For the single swing arm type mechanical seal test device, adopt power input shaft to penetrate and pass annular seal space both sides end cap, two pairs of sealing pairs are arranged symmetrically in the annular seal space, and stationary ring is installed on the annular seal space end cap, and is as shown in Figure 3.If the dimensions of two pairs of sealing pairs at two ends is inconsistent, the axial force that pressure medium causes can not balance; Even the dimensions of the sealing pair at two ends is consistent, because the restriction of structure installs the spring force at two ends, back and can't regulate again, the two pairs of tested sealing surfaces can't realize etc. that specific pressure regulates when promptly testing.
Three, summary of the invention
The utility model purpose of design provides a kind of novel mechanical sealing property tester, and this device does not all have the generation of additional axial force under any test(ing) medium pressure, and the two pairs of tested seal faces such as can realize at the specific pressure adjusting.
The technical solution of the utility model is: a kind of novel mechanical sealing property tester; Comprise torque sensor, bed ways, supporting, main shaft, latch, left end cap, stationary ring, rotating ring, press spring base, stage clip, rotating seat, dive key, left nut, bearing pin I, right nut, major axis cover, right end cap, holding screw, annular seal space housing, planker, bearing pin II; It is characterized in that: main shaft passes left end cap and the right end cap on the annular seal space housing; Put with major axis that gap of main reinforcement cooperates and to be processed with the screw thread that two sections pitch equate, hand of helix is opposite; During the lock sealing cavity shell; Make and screw left nut and right nut and the middle symmetry of annular seal space housing that puts at major axis; Left side nut and right nut symmetria bilateralis are furnished with measure-alike rotating seat, stage clip, press spring base, rotating ring and stationary ring, and the dynamic and static ring of the left and right sides is tested sealing ring; The major axis cover that turns clockwise can drive the left nut that screws with it and right nut equidistantly left, move right, promote left and right two stage clips and compress two rotating rings respectively, till the face pressure when satisfying test.When two pairs of tested sealing rings are installed; Elder generation packs stationary ring in the left end cap; Simultaneously latch one end is inserted in the left end cap hole, the other end is stuck in the groove of stationary ring end face and stops relatively rotating between the two, is enclosed within left end cap and stationary ring wherein on the main shaft together then; Moving carriage drives the locking to the fixed position left of annular seal space housing, and left end cap and annular seal space housing are screwed; The assemble sequence of remaining parts is followed successively by on the main shaft: rotating ring, press spring base, stage clip and rotating seat, bearing pin II, dive key; Then with packing into together, again bearing pin II, rotating seat, stage clip, press spring base, rotating ring, stationary ring, latch and right end cap are packed into after left nut, right nut, major axis cover, the bearing pin I combination; With screw right end cap and annular seal space housing are fixed at last; Axle system in the holding screw that the major axis of screwing puts, annular seal space housing installs.Axle system after installing, two pairs of tested seal faces are not fitted, and the gap between the dynamic and static ring is L.On cooperating, be clearance fit between main shaft and left end rotating ring, press spring base, rotating seat, left nut, the major axis cover, major axis cover and rotating seat, press spring base, rotating ring on it also are clearance fit; Realize circumferentially fixing of main shaft and major axis cover with holding screw, realize the circumferentially fixing of main shaft and left nut, realize circumferentially fixing between right nut and the left nut with bearing pin I with dive key.After unclamping holding screw, can make left nut and right nut not rotate, only move with respect to main axis rotation major axis cover; After tightening holding screw, rotating spindle can pass through left nut, bearing pin I, right nut, bearing pin II, two rotating rings rotations of rotating seat drive.Before the test; The No Load Start motor; Earlier measure the friction torque in the main shaft supporting by torque sensor; The axial dimension of all parts calculates two couples of spacing L between the dynamic and static ring end face between the axial dimension of two pairs of dynamic and static rings of root a tree name and the two pairs of dynamic and static rings then, and spacing L and the major axis pitch that puts screw thread is calculated just the fit number of turns of the required rotation of duration axle sleeve of two pairs of dynamic and static ring end faces thus, by this number of turns rotation major axis cover two pairs of dynamic and static ring end faces is just fitted; The required specific pressure of root a tree name tested seal face of when test calculates and acts on the desired general pressure of tested seal face again, and obviously, general pressure comprises two parts: when a part is test the pressure that causes at tested seal face of logical medium; Another part is the pressure of stage clip to tested seal face; The former can calculate through the net area that pressure medium acts on the tested dynamic and static ring, and the latter is the product of stage clip decrement and stage clip rigidity and the ratio of tested seal face area; The pitch that puts screw thread by the decrement and the major axis of stage clip can calculate the number of turns that major axis overlaps required rotation; Rotate the major axis cover again and to the required number of turns, tighten holding screw, behind the medium of feeding certain pressure, the specific pressure of defined when promptly tested seal face reaches test.
During test; What measured by torque sensor is the total torque in the test unit; Total torque comprises the friction torque of two tested seal faces and the friction torque in the main shaft supporting; Total torque deducted friction torque is the friction torque of single tested seal face then divided by 2 in the main shaft supporting of measuring before the test.In the test period of regulation, the medium that leaks out from two tested seal faces flows out through the leakage hole of the ring groove of left and right end cap respectively, and the medium that two leakage holes flow out is added up divided by 2, is the leakage rate of single tested seal face.
Two sections screw threads that described major axis puts are single thread, with left nut screw for left-hand thread (LHT), be right-hand thread with right nut screws; When major axis puts left nut of screw-in and right nut, make the right side of left nut and the left side of right nut just in time be positioned at the middle applying that major axis puts two sections screw threads, bearing pin I again packs into from the right side of right nut.
Described bearing pin I right ends is inserted respectively in the hole of left nut and right nut; Bearing pin I left end and left nut with interference fit connect, bearing pin I right-hand member and right nut adopt clearance fit; When rotation major axis cover drive left nut and right nut respectively left, when moving right, bearing pin I is along with left nut moves together.
Four, beneficial effect
Advantage and the good effect that the utlity model has are: after adopting main shaft to pass the annular seal space housing and in the annular seal space housing, on the main shaft of right ends the tested sealing ring of measure-alike two couple being housed, main shaft can not produce additional axial force because of the adding of test(ing) medium; Major axis puts and is processed with the screw thread that two sections pitch equate, hand of helix is opposite; The major axis that turns clockwise cover drive the left nut that screws with it and right nut equidistantly left, move right; The number of turns that root a tree name major axis cover rotates and the pitchometer of going up screw thread thereof are calculated the decrement of stage clip; Rigidity by decrement and stage clip can accurately calculate the suffered pressure of tested seal face again, about also having guaranteed simultaneously on the two pairs of seal faces suffered specific pressure identical; Adopt two pairs of measure-alike tested sealing rings to test together; Get test torque and the leakage rate of its mean value, reduced when only testing because accidentalia such as installation cause moment of torsion and leakage rate to measure coarse influence with pair of seal rings as this model mechanical seal.
Five, description of drawings
Fig. 1 representes single swing arm type mechanical seal test device synoptic diagram.
Fig. 2 representes double cantalever type mechanical seal test device synoptic diagram.
Fig. 3 representes that input shaft passes the non-adjustable structural representation of annular seal space two side ends lid spring power.
Fig. 4 representes the axial plane cut-open view before this test unit is installed the back test.
Axial plane cut-open view when Fig. 5 representes to test after this test unit is installed.
Fig. 6 revolves the partial sectional view after turning 90 degrees for annular seal space housing center section structure, the installation situation of expression bearing pin II.
Fig. 7 representes the axial plane cut-open view after left nut, right nut, major axis cover and the bearing pin I combination.
Among Fig. 4,5,6,7: 1, torque sensor 2, bed ways 3, supporting 4, main shaft 5, latch 6, left end cap 7, stationary ring 8, rotating ring 9, press spring base 10, stage clip 11, rotating seat 12, dive key 13, left nut 14, bearing pin I 15, right nut 16, major axis cover 17, right end cap 18, holding screw 19, annular seal space housing 20, planker 21, bearing pin II.
Six, embodiment
Be further content, characteristics and the effect of understanding the utility model, the following examples of giving an example now, and conjunction with figs. specifies as follows:
When two pairs of tested sealing rings are installed; Elder generation packs stationary ring 7 in the left end cap 6; Simultaneously latch 5 one ends are inserted in the hole of left end cap 6, the other end is stuck in the groove of stationary ring 7 end faces and stops relatively rotate (as shown in Figure 4) between the two, then left end cap 6 and stationary ring wherein 7 is enclosed within on the main shaft 4 together; Moving carriage 20 drives annular seal space housing 19 locking to the fixed position left, and left end cap 6 and annular seal space housing 19 are screwed; The assemble sequence of remaining parts is followed successively by on the main shaft 4: rotating ring 8, press spring base 9, stage clip 10, rotating seat 11, bearing pin II21 (as shown in Figure 6), dive key 12; Then packed into together, again bearing pin II21 (as shown in Figure 6), rotating seat 11, stage clip 10, press spring base 9, rotating ring 8, stationary ring 7, latch 5, right end cap 17 are packed in left nut 13, right nut 15, major axis cover 16, bearing pin I14 combination back (as shown in Figure 7); With screw that right end cap 17 is fixing with annular seal space housing 19 at last; The holding screw 18 that the major axis of screwing puts, the axle system in the annular seal space housing 19 installs.Axle system after installing, two pairs of tested seal faces are not fitted, and the gap between the dynamic and static ring is L (as shown in Figure 4).On cooperating, be clearance fit between main shaft 4 and rotating ring 8, press spring base 9, rotating seat 11, left nut 13, the major axis cover 16, major axis cover 16 and rotating seat 11, press spring base 9, rotating ring 8 on it also are clearance fit; Realize the circumferentially fixing of main shaft 4 and major axis cover 16 with holding screw 18, realize the circumferentially fixing of main shaft 4 and left nut 13 with dive key 12, bearing pin I14 and left nut 13 adopt interference fit and clearance fit respectively with right nut 15.After unclamping holding screw 18, can make left nut 13 not rotate with right nut 15, only move with respect to main shaft 4 rotation major axis covers 16; After tightening holding screw 18, rotating spindle 4 can pass through dive key 12, left nut 13, bearing pin I14, right nut 15,8 rotations of two rotating rings of rotating seat 11 drives.Before the test; The No Load Start motor; Earlier measure the friction torque in the main shaft supporting 3 by torque sensor 1; The axial dimension of all parts calculates two couples of spacing L between the dynamic and static ring end face between the axial dimension of two pairs of dynamic and static rings of root a tree name and the two pairs of dynamic and static rings then; The pitch of screw thread is calculated just the fit number of turns of duration axle sleeve 16 required rotations of two dynamic and static ring end faces on spacing L and the major axis cover 16 thus, makes two pairs of dynamic and static ring end faces just fit (as shown in Figure 5) by this number of turns rotation major axis cover 16; The required specific pressure of tested seal face deducted pressure medium and acts on the specific pressure that net area produced on the tested dynamic and static ring when root a tree name was tested again; After difference calculates the number of turns of 10 pairs of required pressure of tested seal face of stage clip and rotation thus, rotate major axis cover 16 at last and to the required number of turns, tighten holding screw 18.
During test; What measured by torque sensor 1 is the total torque in the test unit; Total torque comprises the friction torque of two tested seal faces and the friction torque in the main shaft supporting 3, and total torque is deducted friction torque in the main shaft supporting 3 then divided by two, is the friction torque of single seal face.In the test period of regulation, the medium that leaks out from two seal faces flows out in the leakage hole of the ring groove through left end cap 6 and right end cap 17 respectively, and the medium that two leakage holes flow out is added up divided by two, is the leakage rate of single seal face.
Claims (4)
1. novel mechanical sealing property tester; Comprise torque sensor (1), bed ways (2), supporting (3), main shaft (4), latch (5), left end cap (6), stationary ring (7), rotating ring (8), press spring base (9), stage clip (10), rotating seat (11), dive key (12), left nut (13), bearing pin I (14), right nut (15), major axis cover (16), right end cap (17), holding screw (18), annular seal space housing (19), planker (20), bearing pin II (21); It is characterized in that: main shaft (4) passes left end cap (6) and the right end cap (17) on the annular seal space housing (19); Be processed with the screw thread that two sections pitch equate, hand of helix is opposite on the major axis cover (16) of main shaft (4) clearance fit; During lock sealing cavity shell (19); Make the left nut (13) and the right nut (15) and the middle symmetry of annular seal space housing (19) that screw on major axis cover (16), the dynamic and static ring that left nut (13) and right nut (15) symmetria bilateralis are furnished with measure-alike rotating seat (11), stage clip (10), press spring base (9), rotating ring (8) and the stationary ring (7) and the left and right sides is tested sealing ring; The major axis cover (16) that turns clockwise can drive the left nut (13) that screws with it and right nut (15) equidistantly left, move right; Promote left and right two rotating seats (11) and compress two rotating rings respectively, till the face pressure when satisfying test through stage clip (10) and press spring base (9).
2. the described novel mechanical sealing property tester of root a tree name claim 1, it is characterized in that: two sections screw threads on the major axis cover (16) are single thread, are left-hand thread (LHT) with left nut (13) screws, are right-hand thread with right nut (15) screws.
3. the described novel mechanical sealing property tester of root a tree name claim 1; It is characterized in that: bearing pin I (14) left end and left nut (13) with interference fit connect, and right nut (15) between adopt clearance fit; Realize the circumferentially fixing of left nut (13) and main shaft (4) with dive key (12), realize circumferentially fixing of right nut (15) and left nut (13) with bearing pin I (14).
4. the described novel mechanical sealing property tester of root a tree name claim 1 is characterized in that: during rotation major axis cover (16), left nut (13) and right nut (15) be only mobile with respect to main shaft (4), do not rotate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200535012U CN202420794U (en) | 2012-02-20 | 2012-02-20 | Novel mechanical seal performance test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200535012U CN202420794U (en) | 2012-02-20 | 2012-02-20 | Novel mechanical seal performance test device |
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| CN202420794U true CN202420794U (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200535012U Withdrawn - After Issue CN202420794U (en) | 2012-02-20 | 2012-02-20 | Novel mechanical seal performance test device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589821A (en) * | 2012-02-20 | 2012-07-18 | 南京林业大学 | Novel mechanical sealing performance testing apparatus |
| CN104062084A (en) * | 2014-07-03 | 2014-09-24 | 哈尔滨工程大学 | Test bench for comparison of working conditions of seal ring |
| WO2014180152A1 (en) * | 2013-05-06 | 2014-11-13 | 南京林业大学 | Performance test device for mechanical seal |
-
2012
- 2012-02-20 CN CN2012200535012U patent/CN202420794U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589821A (en) * | 2012-02-20 | 2012-07-18 | 南京林业大学 | Novel mechanical sealing performance testing apparatus |
| CN102589821B (en) * | 2012-02-20 | 2014-07-02 | 南京林业大学 | Novel mechanical sealing performance testing apparatus |
| WO2014180152A1 (en) * | 2013-05-06 | 2014-11-13 | 南京林业大学 | Performance test device for mechanical seal |
| US9631990B2 (en) | 2013-05-06 | 2017-04-25 | Nanjing Forestry University | Device for testing mechanical seal performance |
| CN104062084A (en) * | 2014-07-03 | 2014-09-24 | 哈尔滨工程大学 | Test bench for comparison of working conditions of seal ring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120905 Effective date of abandoning: 20140702 |
|
| RGAV | Abandon patent right to avoid regrant |