CN2697349Y - Non-return valve for high-speed liquid phase chromatographic pump - Google Patents
Non-return valve for high-speed liquid phase chromatographic pump Download PDFInfo
- Publication number
- CN2697349Y CN2697349Y CN 200420025487 CN200420025487U CN2697349Y CN 2697349 Y CN2697349 Y CN 2697349Y CN 200420025487 CN200420025487 CN 200420025487 CN 200420025487 U CN200420025487 U CN 200420025487U CN 2697349 Y CN2697349 Y CN 2697349Y
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- China
- Prior art keywords
- valve
- spool
- pouring weight
- way valve
- speed liquid
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Abstract
The utility model discloses a non-return valve for a high-speed liquid phase chromatographic pump, comprising a valve body and a valve cavity which is arranged on the valve body. A valve seat and a valve core are mounted in the valve cavity, a heavy block which is positioned at the top part of the valve core is movably mounted in the valve cavity, the valve core is a spheroidal valve core, and a discharge orifice is arranged on the heavy block. The non-return valve for a high-speed liquid phase chromatographic pump has the advantages of simple structure, reliable use and low failure rate.
Description
Technical field
The utility model relates to a kind of liquid chromatograph, relates in particular to the one-way valve that is used for the high speed liquid chromatograph high pressure pump.
Background technique
High pressure pump is the important composition parts of high speed liquid chromatograph, stability, repeatability and the analysis precision of the direct impact analysis of performance of high pressure pump.High pressure pump commonly used extensively adopts mechanical reciprocating plunger pump, and it is by the to-and-fro motion of its piston rod in fluid cylinder, alternately sucks and output liquid comes work; In this class pump, one-way valve is not only the indispensable vitals of infusion pump, and the performance of its one-way valve is directly determining the using effect of high pressure pump again.
In the prior art, the one-way valve of high pressure pump is the straight check valve that Returnning spring is arranged at spool (as spherical valve core) upper support mostly.The one-way valve of this conventional construction, though have simple in structurely, the advantage that volume is little exists in use that some are significantly not enough: on the one hand, because the spring long-term work is in Korrosionsmedium, and frequency of okperation is higher, spring is very easily tired and damage; On the other hand, because the valve pocket space is little, the spring size is limited, not only makes spool be difficult to obtain reliable and stable reseting elasticity, and form easily and leak, and also very inconvenience of the replacing of spring.Therefore, the one-way valve of this structure, the rate of fault height, it is unreliable to use, and is easy to cause one-way valve to lose efficacy.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing in prior technology, technical problem to be solved in the utility model is, a kind of one-way valve that is used for the high-speed liquid chromatography pump is provided, and it is not only simple in structure, and volume is little, and uses reliably, and rate of fault is low.
The technological scheme that its technical problem that solves the utility model adopts is, the one-way valve that is used for the high-speed liquid chromatography pump comprises valve body and is arranged at valve pocket on the valve body, and valve seat and spool are housed in this valve pocket, pouring weight also is housed in the described valve pocket versatilely, and this pouring weight is positioned at the top of spool.
In preferred implementation of the utility model, described spool is the spheroidal spool.
In another preferred implementation of the utility model, described pouring weight is provided with discharge orifice.
After adopting said structure, since the top movable of spool the pouring weight that applies reposition force is housed, one-way valve not only has advantage simple in structure, that volume is little, and fundamentally avoided adopting the inefficacy that spring brought causes such as spring fatigue, corrosion, and spring need regularly replace and change defectives such as inconvenience, greatly reduce the rate of fault of one-way valve, improved the functional reliability of one-way valve.After adopting this structure of pouring weight simultaneously, make spool again under the situation that does not increase volume and weight, obtain more reliable valve core reset power, reduced the probability that one-way valve leaks and lost efficacy, guaranteed the proper functioning of one-way valve.Owing to adopt the spherical shape spool, it is simple in structure again, resets accurately, and sealing is reliable; Adopt discharge orifice on the pouring weight, reduced liquid resistance, improved the speed of response that resets of spool, guaranteed the further raising of functional reliability.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail
Fig. 1 is the topology view of first embodiment of the present utility model.
Fig. 2 is the pouring weight plan view (amplification) in the structure shown in Figure 1.
Fig. 2 is the plan view (amplification) of the pouring weight in the structure shown in Figure 1.
Fig. 4 is the topology view of another embodiment of the present utility model.
Among the figure, 1, valve seat; 2, valve body; 3, valve gap; 4, valve casing; 5, go up sealing gasket; 6, pouring weight; 6-1, discharge orifice; 7, spool; 8, valve pocket; 9, valve seat through-hole; 10, lower seal pad.
Embodiment
From mode of execution of the present utility model shown in Figure 1 as can be seen, valve body 2 is loaded in the respective aperture seat of valve casing 4 by last sealing gasket 5 and lower seal pad 10, the lower end of this valve casing 4 is by on the pump head body that is threadedly connected to high speed liquid chromatograph high pressure rear pump, and the upper end of this valve casing 4 then is the highly pressurised liquid delivery outlet.Valve body 2 is provided with valve pocket 8, in this valve pocket 8, valve seat 1, spool 7, pouring weight 6 and valve gap 3 is housed successively from bottom to top; The valve seat 1 and the valve gap 3 that are positioned at valve pocket 8 are fixedly mounted on the valve body 2, and 6 of spool 7 and pouring weights are loaded in the valve pocket 8 between valve seat 1 and the valve gap 3 versatilely.The center portion of valve seat 1 is provided with valve seat through-hole 9, and spool 7 is positioned at the end suitable for reading of valve seat through-hole 9 versatilely, and pouring weight 6 then is positioned at the top of spool 7 versatilely.Spool 7 is the spheroidal spool, and its sphere diameter is greater than the aperture of valve seat through-hole 9.This one-way valve is loaded on the delivery outlet of high pressure rear pump, and when high pressure rear pump output liquid, liquid backs down spool 7 and pouring weight 6 and makes highly pressurised liquid output; When the high pressure rear pump sucked liquid, the spool 7 of this one-way valve and pouring weight 6 made spool 7 closed valve seat through holes 10 and liquid can't be refluxed under action of gravity.
As Fig. 2, shown in Figure 3, the profile of pouring weight 6 is that cylinder reaches the circular cone composition that joins with it, and the end face of pouring weight 6 is evenly equipped with the discharge orifice 6-1 of three perforations; The lower end of pouring weight 6 be one with the corresponding chamfering of spherical valve core so that the guiding contraposition of pouring weight 6 and spool 7; The cone on pouring weight 6 tops and the discharge orifice 6-1 on the pouring weight 6 both be beneficial to the reduction liquid resistance, were beneficial to pouring weight 6 and spool 7 maintenance steady states again, thereby had further improved the directional properties of pouring weight 6 and spool 7.
Figure 4 shows that another kind of mode of execution of the present utility model, as can be seen from the figure, the basic structure of its one-way valve is still same as the previously described embodiments, but two groups of one-way valve unit are installed in valve casing 4.The interaction of two one-way valve unit has formed one section fluid column in addition between two groups of one-way valve unit, further improved the functional reliability of one-way valve, has avoided the leakage of one-way valve, reduces the chance of failure of one-way valve to greatest extent.
Above-mentioned only is two preferred embodiments of the present utility model.But be appreciated that some features in this two mode of execution can conversion or improvement.For example valve casing and valve body can combine together; Spool can also be corresponding construction forms such as awl, post; The profile of pouring weight also can make improvements and change, and the discharge orifice on it more can be selected different quantity and size according to different usage requirements; This one-way valve unit number can also be more than three or three except that one, two; The one-way valve of this structure can be loaded on the delivery outlet of high pressure pump, also can be loaded on the inlet opening, but both assembly directions are opposite.These all should be considered as falling in the protection domain of the present utility model without prejudice to the conversion and the improvement of the utility model principle.
Claims (4)
1, a kind of one-way valve that is used for the high-speed liquid chromatography pump, comprise valve body (2) and be arranged at valve pocket (8) on the valve body (2), valve seat (1) and spool (7) are housed in this valve pocket (8), it is characterized in that: pouring weight (6) also is housed in the described valve pocket (8) versatilely, and this pouring weight (6) is positioned at the top of spool (7).
2, one-way valve according to claim 1 is characterized in that; Described spool (7) is the spheroidal spool.
3, one-way valve according to claim 1 is characterized in that: described pouring weight (6) is provided with discharge orifice (6-1).
4, according to claim 1,2 or 3 described one-way valves, it is characterized in that: described valve seat (1) medium position is provided with valve seat through-hole (9), and spool (7) is positioned at the suitable for reading of this valve seat through-hole (9) versatilely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025487 CN2697349Y (en) | 2004-03-18 | 2004-03-18 | Non-return valve for high-speed liquid phase chromatographic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025487 CN2697349Y (en) | 2004-03-18 | 2004-03-18 | Non-return valve for high-speed liquid phase chromatographic pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2697349Y true CN2697349Y (en) | 2005-05-04 |
Family
ID=34770974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420025487 Expired - Fee Related CN2697349Y (en) | 2004-03-18 | 2004-03-18 | Non-return valve for high-speed liquid phase chromatographic pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2697349Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985714A (en) * | 2019-11-28 | 2020-04-10 | 北京卫星制造厂有限公司 | UHPLC liquid phase pump ultrahigh pressure high accuracy check valve |
| US12066117B2 (en) | 2021-05-26 | 2024-08-20 | Waters Technologies Corporation | Check valve having a spherical loading element |
-
2004
- 2004-03-18 CN CN 200420025487 patent/CN2697349Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110985714A (en) * | 2019-11-28 | 2020-04-10 | 北京卫星制造厂有限公司 | UHPLC liquid phase pump ultrahigh pressure high accuracy check valve |
| US12066117B2 (en) | 2021-05-26 | 2024-08-20 | Waters Technologies Corporation | Check valve having a spherical loading element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050504 |