CN204512439U - Cryogenic piston pump seal arrangement - Google Patents
Cryogenic piston pump seal arrangement Download PDFInfo
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- CN204512439U CN204512439U CN201520093179.XU CN201520093179U CN204512439U CN 204512439 U CN204512439 U CN 204512439U CN 201520093179 U CN201520093179 U CN 201520093179U CN 204512439 U CN204512439 U CN 204512439U
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Abstract
The utility model discloses a kind of cryogenic piston pump seal arrangement, liquid phase seal section (3) and gas phase seal section (4) is provided with between the pump housing (1) and piston rod (2), cover (5) was set between liquid phase seal section (3) and gas phase seal section (4), cross mineralization pressure chamber (7) between cover (5) and piston rod (2), mistake cover (5) radially offers the first through hole (5a) and the second through hole (5b), first through hole (5a) and the second through hole (5b) are all communicated with pressure chamber (7), the pump housing (1) just offers nitrogen inlet (1a) to the position of the first through hole (5a), the pump housing (1) just offers nitrogen outlet (1b) to the position of the second through hole (5b).The utility model structure is simple, and processing and fabricating is easy, and cost of production is low, perfect can prevent the leakage of cryopump fed sheet of a media, can guarantee to use on-the-spot Security.
Description
Technical field
The utility model belongs to reciprocating pump technical field, specifically, and the rod seal particularly in cryogenic piston pump.
Background technique
Cryogenic piston pump is the visual plant of LNG gas station, is mainly used in Cryo Equipment LNG Liquefied natural gas being delivered to vaporizer supercharging or by pipeline, cryogenic liquide being delivered to liquid storage vessel.At present, the cryogenic piston pump that most of LNG gas station of China uses all depends on import, and price is very expensive.Although some producers are are also actively researching and developing the cryogenic piston pump product for LNG gas station, but ubiquity complex structure, assembling difficulty, pressure do not reach the deficiencies such as requirement, flow be too small, performance does not reach the performance requirement under gas station actual conditions, is difficult to large-scale promotion application.
Black box is the vitals in cryogenic piston pump.In order to avoid LNG Liquefied natural gas is revealed in pressurization, traditional approach adopts multi-stage mechanical sealing liquid towards rock gas and gaseous natural gas to seal, and reveals producing danger to prevent it.This mechanical seal mode ubiquity black box life-span is shorter, and sealing exists certain situation about revealing, and can produce certain influence, and can there is potential safety hazard in use scene to pump housing supercharging.
Model utility content
Technical problem to be solved in the utility model is to provide a kind of cryogenic piston pump seal arrangement that effectively can reduce Leakage Gas.
The technical solution of the utility model is as follows: a kind of cryogenic piston pump seal arrangement, piston rod (2) is worn in the pump housing (1), liquid phase seal section (3) and gas phase seal section (4) is provided with between the pump housing (1) and piston rod (2), described liquid phase seal section (3) is made up of multiple liquid phase black box offseted successively, gas phase seal section (4) is made up of multiple gas phase black box offseted successively, cover (5) was set between liquid phase seal section (3) and gas phase seal section (4), this is crossed between cover (5) and liquid phase seal section (3) and is provided with butterfly spring (6), its key is: described mistake overlaps mineralization pressure chamber (7) between (5) and piston rod (2), mistake cover (5) radially offers the first through hole (5a) and the second through hole (5b), first through hole (5a) and the second through hole (5b) are all communicated with pressure chamber (7), the described pump housing (1) just offers nitrogen inlet (1a) to the position of the first through hole (5a), the pump housing (1) just offers nitrogen outlet (1b) to the position of the second through hole (5b), described nitrogen inlet (1a) and nitrogen outlet (1b) all extend to inwall from the outer wall of the pump housing (1).
Adopt above technological scheme, the nitrogen inlet on the pump housing connects 0.1MPa nitrogen pipeline, makes nitrogen from nitrogen inlet, the first through hole feed pressure chamber, and outwards flows out by the second through hole and nitrogen outlet.The utility model forms a hydrogen circulation passage in the pump housing, a pressure chamber is formed at cryogenic piston pump sealing gas collecting segment (crossing cover place), the bog revealed from liquid phase seal section can be made during excessively overlapping to reach pressure equilibrium, and the gas that can reduce leakage further enters gas phase seal section.Because gas phase seal section belongs to multistage reduction sealing, so still there is certain leakage at gas phase seal section in gas leakage, and hydrogen circulation passage effectively can reduce the gas flow entering gas phase seal section, weaken effect through the multistage of gas phase seal section again, almost perfection can realize pump housing zero leakage.
For the ease of processing and fabricating, reduce cost of production, and guarantee the smoothness of hydrogen circulation passage gas flow, described nitrogen inlet (1a), the first through hole (5a), the second through hole (5b) and nitrogen outlet (1b) are located along the same line.
Described cover (5) of crossing is made up of stainless steel, crosses the two ends of cover (5) all towards 90 °, the direction flange of its shaft axis.Cross cover material selection stainless steel, structural strength is good, not yielding or damage, and can tolerate low temperature; The two ends crossing cover, all to in-flanges, are easy to processing and fabricating, while being convenient to be enclosed within pump housing inner position, can take into account mineralization pressure chamber.
Beneficial effect: the utility model structure is simple, processing and fabricating is easy, and cost of production is low, perfect can prevent the leakage of cryopump fed sheet of a media, can guarantee to use on-the-spot Security.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
As shown in Figure 1, the utility model is made up of the pump housing 1, piston rod 2, liquid phase seal section 3, gas phase seal section 4, mistake cover 5 and butterfly spring 6 etc.Wherein, piston rod 2 is located in the pump housing 1, and both shaft axiss overlap.Left part in the pump housing 1 arranges liquid phase seal section 3, and the right part in the pump housing 1 arranges gas phase seal section 4, and liquid phase seal section 3 and gas phase seal section 4 are all between the pump housing 1 and piston rod 2.Liquid phase seal section 3 is made up of multiple liquid phase black box offseted successively, and gas phase seal section 4 is made up of multiple gas phase black box offseted successively, and the number of each black box is determined according to actual needs.Liquid phase black box and gas phase black box equal diameters, the shaft axis of liquid phase black box and the shaft axis of gas phase black box are point-blank.
As shown in Figure 1, arranged between liquid phase seal section 3 and gas phase seal section 4 and overlapped 5, and crossed cover 5 and be made up of stainless steel, and crossed the two ends of cover 5 all towards 90 °, the direction flange of its shaft axis, cross cover 5 and the pump housing 1 and piston rod 2 Spielpassung.Excessively be provided with butterfly spring 6 between cover 5 and liquid phase seal section 3, the right-hand member of butterfly spring 6 offsets with the left end crossing cover 5, left end and one, the rightmost side liquid phase black box of butterfly spring 6 offset, and one, leftmost side liquid phase black box is spacing by the step surface in the pump housing 1.Right-hand member and one, the leftmost side gas phase black box of crossing cover 5 offset, and one, rightmost side gas phase black box is locked spacing by axle sleeve and nut (not shown in FIG.).
As shown in Figure 1, cross mineralization pressure chamber 7 between cover 5 and piston rod 2, the first through hole 5a is offered in the neutral position crossing cover 5 top, the second through hole 5b is offered in the neutral position crossed bottom cover 5, first through hole 5a and the second through hole 5b all offers along the radial direction crossing cover 5, and through to inwall from the outer wall crossing cover 5, and the first through hole 5a and the second through hole 5b is point-blank, the first through hole 5a and the second through hole 5b is all communicated with pressure chamber 7.The pump housing 1 just offers nitrogen inlet 1a to the position of the first through hole 5a, and nitrogen inlet 1a radially extends to inwall from the outer wall of the pump housing 1, and nitrogen inlet 1a and the first through hole 5a point-blank, and is interconnected.The pump housing 1 just offers nitrogen outlet 1b to the position of the second through hole 5b, and nitrogen outlet 1b radially extends to inwall from the outer wall of the pump housing 1, and nitrogen outlet 1b and the second through hole 5b point-blank, and is interconnected.
The structure that the utility model does not describe is same as the prior art, and therefore not to repeat here.
Claims (3)
1. a cryogenic piston pump seal arrangement, piston rod (2) is worn in the pump housing (1), liquid phase seal section (3) and gas phase seal section (4) is provided with between the pump housing (1) and piston rod (2), described liquid phase seal section (3) is made up of multiple liquid phase black box offseted successively, gas phase seal section (4) is made up of multiple gas phase black box offseted successively, cover (5) was set between liquid phase seal section (3) and gas phase seal section (4), this is crossed between cover (5) and liquid phase seal section (3) and is provided with butterfly spring (6), it is characterized in that: described mistake overlaps mineralization pressure chamber (7) between (5) and piston rod (2), mistake cover (5) radially offers the first through hole (5a) and the second through hole (5b), first through hole (5a) and the second through hole (5b) are all communicated with pressure chamber (7), the described pump housing (1) just offers nitrogen inlet (1a) to the position of the first through hole (5a), the pump housing (1) just offers nitrogen outlet (1b) to the position of the second through hole (5b), described nitrogen inlet (1a) and nitrogen outlet (1b) all extend to inwall from the outer wall of the pump housing (1).
2. cryogenic piston pump seal arrangement according to claim 1, is characterized in that: described nitrogen inlet (1a), the first through hole (5a), the second through hole (5b) and nitrogen outlet (1b) are located along the same line.
3. cryogenic piston pump seal arrangement according to claim 1 and 2, is characterized in that: described cover (5) of crossing is made up of stainless steel, crosses the two ends of cover (5) all towards 90 °, the direction flange of its shaft axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520093179.XU CN204512439U (en) | 2015-02-10 | 2015-02-10 | Cryogenic piston pump seal arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520093179.XU CN204512439U (en) | 2015-02-10 | 2015-02-10 | Cryogenic piston pump seal arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204512439U true CN204512439U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520093179.XU Active CN204512439U (en) | 2015-02-10 | 2015-02-10 | Cryogenic piston pump seal arrangement |
Country Status (1)
| Country | Link |
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| CN (1) | CN204512439U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109751238A (en) * | 2019-02-22 | 2019-05-14 | 郑州沃华机械有限公司 | A kind of smelt gear pump and its sealing structure |
| US10788026B2 (en) | 2016-11-21 | 2020-09-29 | Caterpillar Inc. | Cryogenic pump |
-
2015
- 2015-02-10 CN CN201520093179.XU patent/CN204512439U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10788026B2 (en) | 2016-11-21 | 2020-09-29 | Caterpillar Inc. | Cryogenic pump |
| CN109751238A (en) * | 2019-02-22 | 2019-05-14 | 郑州沃华机械有限公司 | A kind of smelt gear pump and its sealing structure |
| CN109751238B (en) * | 2019-02-22 | 2024-03-08 | 郑州沃华机械有限公司 | Melt gear pump and sealing structure thereof |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |