CN203161513U - Novel low-temperature reciprocating pump composite sealing structure - Google Patents
Novel low-temperature reciprocating pump composite sealing structure Download PDFInfo
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- CN203161513U CN203161513U CN 201320167966 CN201320167966U CN203161513U CN 203161513 U CN203161513 U CN 203161513U CN 201320167966 CN201320167966 CN 201320167966 CN 201320167966 U CN201320167966 U CN 201320167966U CN 203161513 U CN203161513 U CN 203161513U
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- guide sleeve
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Abstract
The utility model relates to a novel low-temperature reciprocating pump composite sealing structure, comprising a throttling sleeve, a gas storage cavity and a guide sleeve, wherein a spacer bush I is arranged at the rotating shaft front section positioned at one side of the throttling sleeve; two groups of T-shaped sealing pieces are sequentially arranged on the shaft section between the throttling sleeve and the spacer bush I; a spacer bush II is mounted at the rotating shaft middle section positioned between the throttling sleeve and the guide sleeve; a lip edge sealing group II consisting of a plurality of sealing pieces which are tightly arranged is arranged at each of the rotating shaft middle section positioned between the spacer bush I and the spacer bush II, and the rotating shaft rear section positioned between the spacer bush II and the guide sleeve; a sealing group I is arranged at each side of each lip edge sealing group II; and a hot water pipe is additionally arranged outside the gas storage cavity positioned at the spacer bush II. The novel low-temperature reciprocating pump composite sealing structure has the benefits of prolonging the service life of the seal to 3,000 hours, increasing the concentricity during operation of a machine unit, reducing vibration of a piston rod, prolonging the maintenance period of equipment, reducing cost and reducing emission pollution.
Description
Technical field
The utility model relates to the required low temperature reciprocating pump seal of industry technology such as chemical industry, industrial and mining enterprise, national defence scientific research, relate in particular to cryogenic medias such as a kind of high-pressure liquefaction rock gas for delivery of small flow, liquid hydrogen, liquid oxygen, and be used for the new type low temperature reciprocating pump compound sealing structure to occasions such as reciprocating pump seal reliability requirement height, time sealing life length.
Background technique
Reciprocating pump is to rely on piston, plunger or barrier film to-and-fro motion in pumping cylinder, swept volume in the cylinder is alternately increased and dwindles to carry liquid or makes it the positive displacement pump of supercharging.During work, when piston moves from left to right, form negative pressure in the pumping cylinder, then liquid enters in the pumping cylinder through sucking the electric reciprocating pump valve in the storage tank; When the piston right-to-left moved, liquid was squeezed in the cylinder, and pressure increases, and is discharged by expulsion valve.At present, the main seal form that adopts general plug sealing, lip limit sealing (mostly being pure teflon makes) or both combinations of the pump head sealing of domestic common low temperature reciprocating pump (shown in Figure 2), the leading portion sealing seals liquid, the centre is provided with air storing cavity and dish spring, the rear end seals the middle part gaseous medium, and when discharge pressure 〉=20MPa, sealing life is (about 1000h) less than normal all, the reliability of sealing is relatively poor, and then influences the operational safety of unit.Simultaneously, when the transporting low temperature medium, change sealing and need rise again to pump head, open exhaust-valve, bleed off interior media, can't pull down pump head, need after the start again pump head and the precooling of turnover pipeline, the liquid medium vaporization causes dielectric loss; In addition, also exist problems such as befouling environment, the repair and replacement cost is higher.Therefore, at above aspect, need reasonably improve prior art.
Summary of the invention
At above defective, the utility model provides a kind of and is conducive to prolong sealing working life, can improve sealing reliability, reduces the new type low temperature reciprocating pump compound sealing structure that number of times, the repair and replacement that reduce unit and operating cost, minimizing environmental pollution are changed in sealing, to solve many deficiencies of prior art.
For achieving the above object, the utility model is by the following technical solutions:
A kind of new type low temperature reciprocating pump compound sealing structure, comprise orifice sleeve, air storing cavity, guide sleeve, orifice sleeve and guide sleeve are installed on the rotating shaft two ends respectively, the rotating shaft leading portion that is positioned at orifice sleeve one side is provided with the spacer I, sets gradually two groups of T shape Sealings on the shaft part between described orifice sleeve and the spacer I; Rotating shaft stage casing between orifice sleeve and guide sleeve is equipped with the spacer II, the lip limit sealing group II that is closely rearranged by some Sealings is being set respectively on the rotating shaft stage casing between spacer II and the spacer I and on the rotating shaft back segment between spacer II and the guide sleeve separately, is being positioned at each sealing group II both sides, lip limit a sealing group I is set respectively; Simultaneously, an air storing cavity is offered in each spacer inside, and hot-water line is set up in the air storing cavity outside that is positioned at spacer II position; Rotating shaft stage casing between orifice sleeve and guide sleeve is equipped with dished spring assembly, and gland nut is installed in the described guide sleeve outside.
The beneficial effect of new type low temperature reciprocating pump compound sealing structure described in the utility model is: adopt the sealing of lip limit, install the hot water heating pipe additional in the air storing cavity outside by setting up two T shape Sealings, stage casing and back segment at sealing position front end, formed compound sealing structure, can make and extend to 3000h in working life of sealing; Simultaneously, adopt special modification PTFE to seal as lip limit sealing material and with common tetrafluoro lip sapwood material collocation, concentricity in the time of can improving unit operation, reduction piston vibration of bar, prolongation device maintenance replacement cycle, reduction operating cost have also reduced exhaust emission simultaneously.
Description of drawings
With reference to the accompanying drawings the utility model is described in further detail below.
Fig. 1 is the schematic representation of the described new type low temperature reciprocating pump of the utility model embodiment compound sealing structure;
Fig. 2 is traditional low temperature reciprocating pump seal structural representation.
Among the figure:
1, orifice sleeve; 2, T shape Sealing; 3, spacer I; 4, sealing group I; 5, lip limit sealing group II; 6, dished spring assembly; 7, spacer II; 8, hot-water line; 9, guide sleeve; 10, gland nut.
Embodiment
Shown in Fig. 1-2, the described new type low temperature reciprocating pump of the utility model embodiment compound sealing structure, comprise orifice sleeve 1, air storing cavity 7, guide sleeve 9, described orifice sleeve 1 is installed on the rotating shaft two ends respectively with guide sleeve 9, the shaft part that is positioned at orifice sleeve 1 one sides is provided with spacer I 3, sets gradually between two groups of T shape Sealings 2 and the two groups of T shape Sealings 2 separated by a distance on the shaft part between described orifice sleeve 1 and the spacer I 3; Rotating shaft stage casing between orifice sleeve 1 and guide sleeve 9 is equipped with dished spring assembly 6, be provided with spacer II 7 with these dished spring assembly 6 adjacent sides, the lip limit sealing group II 5 that is closely rearranged by some Sealings is being set respectively on the rotating shaft stage casing between spacer II 7 and the spacer I 3 and on the rotating shaft back segment between spacer II 7 and the guide sleeve 9 separately, is being positioned at each sealing group II 5 both sides, lip limit a sealing group I 4 is set respectively; Simultaneously, an air storing cavity is offered in each spacer inside, and hot-water line 8 is set up in the air storing cavity outside that is positioned at spacer II 7 positions, and gland nut 10 is installed in described guide sleeve 9 outsides.
The described new type low temperature reciprocating pump of above the utility model embodiment compound sealing structure, be decompressed to P2 through two groups of T shape sealing group 2 behind pump head sealing load P1 process leading portion orifice sleeve 1 expenditure and pressure and enter spacer I 3, before underfill liquid or gas vaporization, rear seal pressure does not have sealing load or pressure substantially much smaller than P1; Through entering air storing cavity after stage casing sealing group I 4,5 sealings of lip limit sealing group II, sealing load is reduced to P3 again, because the outside is provided with hot-water line 8 heating systems, the air storing cavity medium exists with gaseous state all the time; Back segment seals main blanket gas phase medium, that same stage casing sealing group I 4, the lip limit sealing group II 5 compound seal modes of adopting, the lip limit Sealing of sealing group I 4 are that special modification PTFE is made, rubbed is little, wear rate is low, low, its life-span of shrinkage is 3 times of common tetrafluoro product during low temperature; The lip limit Sealing of lip limit sealing group II 5 is that pure PTFE is made, and lubricity is good, can be heat that absorption portion sealing group first produces simultaneously, reduce low-temperature deformation and then reduce wear rate; External heat water pipe 8 is mainly to back-end sealing spare and the heating of air storing cavity medium, reduce Sealing the low temperature contraction deformation, reduce material low temperature brittleness, improve its lubricity, simultaneously the heating, balance air storing cavity temperature, make its pressure keep constant, form sealing gland, stage casing or leading portion leakage medium are sealed.When air storing cavity gaseous pressure P3 surpasses pump head sealing load P1, the stage casing, the leading portion seal failure, P3 and P1 balance, back-end sealing pressure is reduced to P1, simultaneously, T shape is sealed into the face sealing, have the aligning supporting effect, with the guide sleeve 9 at rear portion the activity of piston rod is played constraint, supporting effect has guaranteed the reciprocal horizontal motion of piston rod, reduced the piston vibration of bar, optimize the service condition of sealing, improved its life-span, because, the lip limit is sealed into linear sealing, when seal leakage occurring, also can be by being screwed into gland nut 10 inwards, under dish spring active force, the applying that increases each lip limit sealing and axle realizes continuing sealing, prolongs its working life.
Above embodiment is more preferably embodiment a kind of of the utility model, and the common variation that those skilled in the art carry out in the technical program scope and replacing should be included in the protection domain of the present utility model.
Claims (3)
1. a new type low temperature reciprocating pump compound sealing structure comprises orifice sleeve (1), air storing cavity (7), guide sleeve (9), and orifice sleeve (1) is installed on the rotating shaft two ends respectively with guide sleeve (9), it is characterized in that:
The rotating shaft leading portion that is positioned at orifice sleeve (1) one side is provided with spacer I (3), sets gradually two groups of T shape Sealings (2) on the shaft part between described orifice sleeve (1) and the spacer I (3);
Be positioned on the rotating shaft stage casing between orifice sleeve (1) and the guide sleeve (9) spacer II (7) is installed, be positioned on the rotating shaft stage casing between spacer II (7) and the spacer I (3) and be positioned on the rotating shaft back segment between spacer II (7) and the guide sleeve (9) the lip limit sealing group II (5) that is closely rearranged by some Sealings is set respectively separately, be positioned at each lip limit sealing group II (5) both sides a sealing group I (4) is set respectively;
Simultaneously, an air storing cavity is offered in each spacer inside, and hot-water line (8) is set up in the air storing cavity outside that is positioned at spacer II (7) position.
2. new type low temperature reciprocating pump compound sealing structure according to claim 1 is characterized in that: be positioned on the rotating shaft stage casing between orifice sleeve (1) and the guide sleeve (9) dished spring assembly (6) is installed.
3. new type low temperature reciprocating pump compound sealing structure according to claim 1 is characterized in that: described guide sleeve (9) outside installation gland nut (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320167966 CN203161513U (en) | 2013-04-07 | 2013-04-07 | Novel low-temperature reciprocating pump composite sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320167966 CN203161513U (en) | 2013-04-07 | 2013-04-07 | Novel low-temperature reciprocating pump composite sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203161513U true CN203161513U (en) | 2013-08-28 |
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ID=49022702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320167966 Expired - Lifetime CN203161513U (en) | 2013-04-07 | 2013-04-07 | Novel low-temperature reciprocating pump composite sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203161513U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486018A (en) * | 2013-10-11 | 2014-01-01 | 湖州三井低温设备有限公司 | Large-flow cold end of high-pressure low-temperature reciprocating pump |
| CN103485995A (en) * | 2013-10-11 | 2014-01-01 | 湖州三井低温设备有限公司 | High purity ammonia low temperature reciprocating pump |
| CN103498791A (en) * | 2013-10-11 | 2014-01-08 | 湖州三井低温设备有限公司 | Electric heating seal structure of low temperature reciprocating pump |
| CN105041634A (en) * | 2015-08-17 | 2015-11-11 | 杭州新亚低温科技有限公司 | Ultralow-temperature reciprocating piston pump |
-
2013
- 2013-04-07 CN CN 201320167966 patent/CN203161513U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103486018A (en) * | 2013-10-11 | 2014-01-01 | 湖州三井低温设备有限公司 | Large-flow cold end of high-pressure low-temperature reciprocating pump |
| CN103485995A (en) * | 2013-10-11 | 2014-01-01 | 湖州三井低温设备有限公司 | High purity ammonia low temperature reciprocating pump |
| CN103498791A (en) * | 2013-10-11 | 2014-01-08 | 湖州三井低温设备有限公司 | Electric heating seal structure of low temperature reciprocating pump |
| CN103485995B (en) * | 2013-10-11 | 2016-06-29 | 湖州三井低温设备有限公司 | A kind of high purity ammonia low temperature reciprocating pump |
| CN105041634A (en) * | 2015-08-17 | 2015-11-11 | 杭州新亚低温科技有限公司 | Ultralow-temperature reciprocating piston pump |
| CN105041634B (en) * | 2015-08-17 | 2017-02-01 | 杭州新亚低温科技有限公司 | Ultralow-temperature reciprocating piston pump |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |