CN203758813U - Low-temperature molecular sieve adsorption pump device - Google Patents
Low-temperature molecular sieve adsorption pump device Download PDFInfo
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- CN203758813U CN203758813U CN201420092484.2U CN201420092484U CN203758813U CN 203758813 U CN203758813 U CN 203758813U CN 201420092484 U CN201420092484 U CN 201420092484U CN 203758813 U CN203758813 U CN 203758813U
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Abstract
The utility model belongs to the technical field of a vacuum pump, and in particular relates to a low-temperature molecular sieve adsorption pump device which structurally and mainly comprises a mechanical pump, a corrugated pipe, a low-temperature molecular sieve adsorption pump, a vacuum pipeline, a resistance/ionization compound type vacuum gauge and a compound type vacuum gauge controller, wherein the mechanical pump is connected with the vacuum pipeline by the corrugated pipe; the low-temperature molecular sieve adsorption pump is connected with the vacuum pipeline; the resistance/ionization compound type vacuum gauge is connected with the vacuum pipeline and the compound type vacuum gauge controller. The low-temperature molecular sieve adsorption pump comprises a low-temperature adsorption pump cavity and a liquid nitrogen dewar. The low-temperature molecular sieve adsorption pump device has the advantages that when the device is used for preparing a powder raw material, the low-temperature molecular sieve adsorption pump is combined with the forestage mechanical pump, so that the demand for high vacuum of a powder sample can be met in the air extracting sealing process, and a high-vacuum state can be continuously obtained within a relatively long time; when the deice is used for extracting air of the powder sample, the loss is relatively samll, the service life is prolonged, and the application cost is lowered; the low-temperature molecular sieve adsorption pump device can be used in any working environment, and is high in working limit and convenient to operate.
Description
Technical field
The utility model belongs to vacuum pump technology field, is specifically related to a kind of cryosorption pumping unit, relates in particular to a kind ofly to carry out the cooling absorption of physics by molecular sieve and realize the vacuum pump group of bleeding.The utility model is mainly used in powdered sample while preparing, the severe rugged environment that need to carry out to powder stock vacuum suction sealing.
Background technology
Scientific research task group of the present utility model in the synthetic preparation process of sample, usually relates to and need to carry out vacuum suction sealing to the powder stock of configuration carrying out, and then the temperature environment that the raw material that sealing is completed is placed on setting is reacted growth.This sealing in sample grown early stage is the end vacuum (10 higher than mechanical pump to the demand of vacuum tightness
-1pa magnitude), therefore cannot use merely mechanical pump to be achieved.Although the pump group obtaining for high vacuum is in the market of a great variety, also fairly perfect aspect 26S Proteasome Structure and Function; But these vacuum pump group systems generally adopt molecular pump as fine pumping, this is in the preparation of conventional raw material, especially while preparing powder stock, be subject to great restriction: 1, molecular pump group loss ratio in the time that powder-like is bled is more severe, greatly reduce its life-span and improve application cost; 2, use the high vacuum pumps such as other ionic pump, condenser pump to use under this more severe bad border, be easy to reach working limit, reduce its serviceable life, this has brought great inconvenience to research work.
Summary of the invention
The purpose of this utility model is to provide a kind of low temperature molecular sieve adsorption pumping unit that is difficult for loss, low cost, simple operation; This device can improve the ability of the ability of molecular sieve quick adsorption and the activation cycle that is rapidly heated utilization to greatest extent.
Low temperature molecular sieve adsorption pumping unit provided by the utility model, to utilize low temperature molecular-sieve sorption pump, and in conjunction with prime mechanical pump, corrugated tube, overall exhaust pipe, the resistance/ionize the parts such as compound vacuum meter to build a kind of low temperature molecular sieve adsorption pumping unit of bleeding in advance;
Its structure mainly comprises mechanical pump 1, corrugated tube 2, low temperature molecular-sieve sorption pump 3, vacuum line 4, resistance/ionize compound vacuum meter 5 and compound vacuum meter controller 6; Wherein:
Described mechanical pump 1 is connected with vacuum line 4 by corrugated tube 2; Described low temperature molecular-sieve sorption pump 3 is connected with vacuum line 4; Described resistance/ionize compound vacuum meter 5 to be connected with vacuum line 4, and connect with compound vacuum meter controller 6 by supporting electric wire;
Described low temperature molecular-sieve sorption pump 3 comprises cryosorption pump housing 9 and Dewar container for liquefied nitrogen 10; Described cryosorption pump housing 9 is mainly made up of barrel-shaped vacuum chamber 11 and a columniform porous web 12 of cylinder; Described porous web 12 is nested in vacuum chamber 11, and porous web 12 is netted region between outer and vacuum chamber 11 inwalls and placed molecular sieve; The main body of described vacuum chamber 11 is immersed in the liquid nitrogen of Dewar container for liquefied nitrogen 10, and the openend of vacuum chamber 11 stretches out outside Dewar container for liquefied nitrogen 10; Low temperature molecular-sieve sorption pump 3 connects with vacuum line 4 by the openend of vacuum chamber 11;
On described vacuum line 4, be also provided with one for connecting the sample inlet interface 18 for the treatment of sample drawing, first direct-through valve 14 for 18 foldings of Quality control pipe interface, control the switch corner valve 15 that low temperature molecular-sieve sorption pump 3 is communicated with/disconnects with vacuum line 4 for one, and second direct-through valve 17 that is communicated with/disconnects with vacuum line 4 for controlling corrugated tube 2.
In the utility model, on vacuum line 4, be also provided with one for regulating the vent valve 16 of air inlet, can discharge the vacuum state in vacuum line 4.
In the utility model, treat that described sample drawing pipe interface 18 places install the sample that need to vacuumize, mechanical pump 1 turns round, opening the second direct-through valve 17 bleeds to vacuum line 4, slowly open the first direct-through valve 14, air in sample enters in vacuum line 4 by sample inlet interface 18, resistance/ionize compound vacuum meter 5 for measuring vacuum line 4 vacuum tightnesss, resistance/ionize compound vacuum meter 5 relevant information of measurement is fed back to compound vacuum meter controller 6 and shows in real time, after the vacuum tightness in vacuum line 4 reaches the end vacuum condition of mechanical pump, close the second direct-through valve 17, by under the prerequisite of Dewar container for liquefied nitrogen 10 interior Liquid nitrogen precoolers, open switch corner valve 15 at cryosorption pump housing 9, by the molecular sieve in cryosorption pump housing 9, gas is adsorbed, realize further bleeding to vacuum line 4.
In the utility model, complete sample preparation bleed operation after, open vent valve discharge vacuum state, inside and outside whole device pressure identical after, just can carry out the dismounting of each assembly.
The utility model has the advantage of while preparing powder stock, low temperature molecular-sieve sorption pump combines with the mechanical pump of prime, meet powdered sample demand to high vacuum in air extracting seal process, and can within the longer time, routinely obtain high vacuum state; And loss is smaller in the time that powder-like is bled, extend life-span reduction application cost; And can under bad border of work, use arbitrarily, working limit is high, easy to operate.
Brief description of the drawings
Fig. 1 is one-piece construction diagram of the present utility model.
Fig. 2 is the molecular sieve adsorption pump housing of the present utility model and vacuum line structural diagrams.
Fig. 3 is the structural diagrams of cryosorption pump housing of the present utility model.
Number in the figure: 1 be mechanical pump, 2 for corrugated tube, 3 is for low temperature molecular-sieve sorption pump, 4 be vacuum line, 5 is the compound vacuum meter of resistance/ionize, 6 is compound vacuum meter controller, and 7 is support, and 8 is aluminium sheet, 9 is cryosorption pump housing, and 10 is Dewar container for liquefied nitrogen, and 11 is vacuum chamber, 12 is porous web, and 13 is adapter flange, and 14 is the first direct-through valve, 15 is switch corner valve, 16 is vent valve, and 17 is the second direct-through valve, and 18 is sample inlet interface.
Embodiment
In order better to understand above-mentioned purpose of the present utility model, below in connection with accompanying drawing, describe the utility model in detail.
Mechanical pump 1, as a forepump, connects with the second direct-through valve 17 of vacuum line 4 by corrugated tube 2; Some take-off pipes are set on vacuum line 4 as required; Wherein, a take-off pipe port arranges switch corner valve 15, and low temperature molecular-sieve sorption pump 3, by vacuum chamber 11 openends of cryosorption pump housing 9, connects with switch corner valve 15; On other take-off pipe that the compound vacuum meter 5 of resistance/ionize is arranged on vacuum line 4, and connect with compound vacuum meter controller 6 by supporting electric wire, be used for measuring the vacuum tightness in vacuum line 4; As shown in Figure 1.
Wherein, described vacuum line 4 main bodys can be made up of a three-way pipe and a Five-way tube; Wherein, the first path of three-way pipe and the first path of Five-way tube dock mutually; One compound vacuum meter is set on the alternate path of three-way pipe, and the three-way of three-way pipe connects with a port of the first direct-through valve 14, and the another port of the first direct-through valve 14 connects with sample inlet interface 18; Another compound vacuum meter is set on the alternate path of Five-way tube, the three-way of Five-way tube connects with switch corner valve 15, a vent valve 16 is set on the four-way road of Five-way tube, the five-way road of Five-way tube connects with a port of the second direct-through valve 17, and the another port of the second direct-through valve 17 is connected with corrugated tube 2; As shown in Figure 2.
In the utility model, described resistance/ionize the measurement of compound vacuum meter 5 for vacuum tightness, is pressed onto 10 to realize atmosphere
-5the measurement of vacuum tightness in Pa magnitude.
In the utility model, KF25 mouth by standard between described mechanical pump 1 and corrugated tube 2, utilize O-ring seal and clip to interconnect.
In the utility model, described mechanical pump 1, corrugated tube 2, low temperature molecular-sieve sorption pump 3, vacuum line 4 and true resistance/ionize compound vacuum meter 5 to support by a support 7 is set; Described support 7 adopts industrial aluminum profile to build, and whole support is made up of the standard aluminum section bar of 45mm*45mm, and the right angle of realizing between aluminium section bar by supporting corner fittings and screw connects.Prop up the aluminium sheet 8 for upper surface being configured to, compound vacuum meter controller 6 is embedded in upper surface; As shown in Figure 1.
In the utility model, described cryosorption pump housing 9, can be by arranging an adapter flange 13 at vacuum chamber 11 opening parts, be tightly connected with switch corner valve 15 again, the specification of adapter flange 13 is that CF100 is to KF25, to coordinate the switch corner valve 15 of different size, as shown in Figure 2.
In the utility model, the spatial design mode of described cryosorption pump housing 9 fully takes into account the characteristic of molecular sieve poor heat conductivity, ensures the heat conduction of molecular sieve and pump housing internal chamber wall, in the time that baking is lived again with cooling absorption, can reach rapidly pre-provisioning request.
The special vacuum chamber 11 that described cryosorption pump housing 9 is 100mm by bore and the cylindricality porous web 12 of stainless steel form, and place molecular sieve between the two.In adsorption pump inner side, cylindricality porous web 12 two ends of design arrange upper and lower ring stainless steel net (as Fig. 3 right side), are intended to cylindricality porous web 12 and insert after cryosorption pump housing 9, in its interlayer, can place molecular sieve.Stainless steel porous web 12 advantages are: 1, greatly increase the absorption worksheet area of molecular sieve, promote pumping speed and the efficiency of adsorption pump; 2, improve the thermo-contact of molecular sieve and pump housing outer wall, guarantee coolingly to live again and can reach rapidly pre-provisioning request with baking.As shown in Figure 3.
In the utility model, the adsorbent of molecular sieve of described use is 5A type molecular sieve or other model molecular sieve, and the raw material being applicable to preparing under air or argon gas atmosphere carries out air extracting seal.
Because the diameter of general conventional gas is 2～4, in the utility model, uses and can adsorb the molecular sieve that critical diameter is not more than 5 gas molecule; And 5A type molecular sieve has very strong adsorbability to gas, wherein the strongest to nitrogen, oxygen and argon adsorptive power, these 3 kinds of gases account for 99.9% of volume of air.The adsorptive power of molecular sieve is very large with the impact of temperature, and for active 5A molecular sieve, under liquid nitrogen temperature, in load factor, during lower than 0.5 L/g, its stable equilibrium's pressure is better than 5 × 10
-3pa.Therefore, bakeout degassing and sub-cooled are to ensure molecular-sieve sorption pump pumping performance necessary condition.The test result of native system is presented at that prime mechanical pump is taken out in advance, can in ultra-short Time, reach 10 under the prerequisite of adsorption pump cavity Liquid nitrogen precooler
-3the vacuum tightness of Pa magnitude, the demand to vacuum tightness while being well positioned to meet sample preparation.
In the utility model, the operational scheme of described low temperature molecular-sieve sorption pump 3 is specific as follows:
In Dewar container for liquefied nitrogen 10, add appropriate liquid nitrogen, cryosorption pump housing 9 is immersed in to the fast cooling of realization to the absorption pump housing in liquid nitrogen, because the opening bore of vacuum chamber 11 is greater than Dewar container for liquefied nitrogen 10, cryosorption pump housing 9 can frame above Dewar container for liquefied nitrogen 10, and Dewar container for liquefied nitrogen is fixed with the Telescopic stool that can regulate height.In the time that the temperature of molecular sieve in the pump housing reaches liquid nitrogen temperature, a large amount of gases are adsorbed in the inside surface of its structure cell cavity by microporous molecular sieve, because molecular sieve has very large specific surface area, so can adsorb a large amount of gas.In addition, the spatial design of the described inner porous web 12 of cryosorption pump housing 9 realizes molecular sieve and places at the ring cavity wall place of the pump housing, increases the surface of molecular sieve work absorption, increases work efficiency.Test result shows: with after Liquid nitrogen precooler absorption pump housing half an hour, utilizing forepump to make system arrive 10
-1on the basis of Pa magnitude, adsorption pump work can make system reach rapidly 10 in 5 minutes
-3the vacuum of Pa magnitude, and can be continual and steady more than one and a half hours, add liquid nitrogen and can make to unite continuous firing more than 12 hours.
In the utility model, molecular sieve is a kind of process of physisorption to gas, occurs the problem of molecular sieve adsorption ability variation after repeatedly using, and now needs the operation that the molecular sieve of cryosorption pump housing 9 inside is lived again, activated.Concrete operations are: close the first direct-through valve 14 for the treatment of 18 foldings of sample drawing pipe interface for controlling, open the switch corner valve 15 of mechanical pump valve 17 and low temperature molecular-sieve sorption pump, removal Dewar container for liquefied nitrogen, to pump housing heated baking, and utilizes mechanical pump to bleed.Because vacuum chamber 11 thermal conductivity that contact with molecular sieve are fine, thereby molecular sieve can reach the required temperature of living again very soon in heating process; In addition, the opposite side of molecular sieve is cylindricality porous web 12, the gas permeation porous web 12 that molecular sieve is emitted at high temperature, then taken away by mechanical pump through vacuum line 4.
In the utility model, when a whole set of low temperature molecular sieve adsorption pumping unit work, first close the switch corner valve 15 of low temperature molecular-sieve sorption pump 3, in Dewar container for liquefied nitrogen 10, add appropriate liquid nitrogen, cryosorption pump housing 9 is carried out cooling fast, test result shows that the molecular sieve of cryosorption pump housing 9 inside approaches liquid nitrogen temperature about half an hour; Treating that sample drawing pipe interface 18 places install sample to be taken out, in the utility model, be designed with 4 and treat sample drawing pipe interface, if treat that sample drawing number is less than 4, need the KF25 blind plate that remaining is treated to sample drawing pipe interface standard to seal; Open successively the second through way valve 17 of being connected with corrugated tube 2, with the first through way valve 14 for the treatment of that sample drawing pipe interface 18 is connected, utilize mechanical pump to vacuum line 4 and treat that sample drawing takes out in advance; The vacuum real number showing when the compound vacuum meter 5 of resistance/ionize enters 10
-1after Pa, close the second through way valve 17, open subsequently the switch corner valve 15 of low temperature molecular-sieve sorption pump, the molecular sieve that approaches liquid nitrogen temperature is to vacuum line 4 and treat that the gas in sample drawing carries out quick adsorption.Test result display system can enter 10 within very short time
-3the vacuum state of Pa magnitude.This also shows that adsorption pump design described in the utility model has reached the optimal adsorption effect of molecular sieve.The sodium type of A type crystal structure, can adsorb the sodium type that critical diameter is not more than the molecule A type crystal structure of 5A, can adsorb the molecule 5A type molecular sieve 5A type molecular sieve that critical diameter is not more than 5A.
The utility model has the advantage of: low temperature molecular-sieve sorption pump structural design fully needs to consider heat conduction problem, the absorption pump housing is made with the fabulous special stainless steel material of heat conductivility, and be placed in molecular sieve in pump housing internal chamber wall and cylinder looped network can with the abundant thermo-contact of pump body lumen wall, conduction, ensure live again and can reach rapidly pre-provisioning request when cooling absorption in baking; Solve the problem that molecular sieve thermal conductivity is very poor, need to strengthen to greatest extent the thermo-contact exchange capacity of molecular sieve and outer low-temperature receiver or outer thermal source.In addition, fine pumping pump is long stabilization time, bleeds in advance in conjunction with mechanical pump, and feasible system still can routinely obtain high vacuum after sample installing port exposes atmosphere, improves its adsorption efficiency and the rate of adsorption, meets the sample preparation demand of high yield.And simple in structure, assembling is convenient, is not afraid of pollution, pipeline easy cleaning, pump housing molecular sieve can live again, change, and maintenance cost is low, takes into account pump performance and economic effect.
The utility model is illustrated the utility model with reference to the structure of above-described embodiment, but is not limited to the content of narrating above, and the utility model is included in any amendment and variation in the claims protection domain.
Claims (5)
1. a low temperature molecular sieve adsorption pumping unit, is characterized in that mainly comprising mechanical pump (1), corrugated tube (2), low temperature molecular-sieve sorption pump (3), vacuum line (4), resistance/ionize compound vacuum meter (5) and compound vacuum meter controller (6); Wherein:
Described mechanical pump (1) connects by the same vacuum line of corrugated tube (2) (4); The same vacuum line of described low temperature molecular-sieve sorption pump (3) (4) connects; Described resistance/ionize the same vacuum line of compound vacuum meter (5) (4) to connect, and connect with compound vacuum meter controller (6) by supporting electric wire;
Described low temperature molecular-sieve sorption pump (3) comprises cryosorption pump housing (9) and Dewar container for liquefied nitrogen (10); Described cryosorption pump housing (9) is mainly made up of barrel-shaped vacuum chamber (11) and a columniform porous web (12) of cylinder; Described porous web (12) is nested in vacuum chamber (11), porous web (12) net outer with vacuum chamber (11) inwall between region placement molecular sieve; The main body of described vacuum chamber (11) is immersed in the liquid nitrogen of Dewar container for liquefied nitrogen (10), and the openend of vacuum chamber (11) stretches out outside Dewar container for liquefied nitrogen (10); Low temperature molecular-sieve sorption pump (3) connects by the same vacuum line of openend (4) of vacuum chamber (11);
On described vacuum line (4), be also provided with one for connecting the sample inlet interface (18) for the treatment of sample drawing, first direct-through valve (14) for Quality control pipe interface (18) folding, control the switch corner valve (15) that low temperature molecular-sieve sorption pump (3) is communicated with/disconnects with vacuum line (4) for one, and second direct-through valve (17) that is communicated with/disconnects with vacuum line (4) for controlling corrugated tube (2).
2. low temperature molecular sieve adsorption pumping unit as claimed in claim 1, is characterized in that being also provided with one for regulating the vent valve (16) of air inlet on vacuum line (4).
3. low temperature molecular sieve adsorption pumping unit as claimed in claim 1, is characterized in that mechanical pump (1) is as a forepump, connects by second direct-through valve (17) of the same vacuum line of corrugated tube (2) (4); Vacuum line arranges some take-off pipes on (4) as required; Wherein, a take-off pipe port arranges switch corner valve (15), and low temperature molecular-sieve sorption pump (3) is by vacuum chamber (11) openend of cryosorption pump housing (9), and same switch corner valve (15) connects; On other take-off pipe that resistance/ionize compound vacuum meter (5) is arranged on vacuum line (4), and connect with compound vacuum meter controller (6) by supporting electric wire, be used for measuring the vacuum tightness in vacuum line (4).
4. low temperature molecular sieve adsorption pumping unit as claimed in claim 2, is characterized in that described vacuum line (4) main body is made up of a three-way pipe and a Five-way tube; Wherein, the first path of three-way pipe and the first path of Five-way tube dock mutually; One compound vacuum meter is set on the alternate path of three-way pipe, and the three-way of three-way pipe connects with a port of the first direct-through valve (14), and the another port of the first direct-through valve (14) connects with sample inlet interface (18); Another compound vacuum meter is set on the alternate path of Five-way tube, the same switch corner valve of three-way (15) of Five-way tube connects, a vent valve (16) is set on the four-way road of Five-way tube, the five-way road of Five-way tube connects with a port of the second direct-through valve (17), and the another port of the second direct-through valve (17) is connected with corrugated tube (2).
5. low temperature molecular sieve adsorption pumping unit as claimed in claim 1, is characterized in that described mechanical pump (1), corrugated tube (2), low temperature molecular-sieve sorption pump (3), vacuum line (4) and true resistance/ionize compound vacuum meter (5) to support by a support (7) is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420092484.2U CN203758813U (en) | 2014-03-03 | 2014-03-03 | Low-temperature molecular sieve adsorption pump device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420092484.2U CN203758813U (en) | 2014-03-03 | 2014-03-03 | Low-temperature molecular sieve adsorption pump device |
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| Publication Number | Publication Date |
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| CN203758813U true CN203758813U (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420092484.2U Withdrawn - After Issue CN203758813U (en) | 2014-03-03 | 2014-03-03 | Low-temperature molecular sieve adsorption pump device |
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| Country | Link |
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| CN (1) | CN203758813U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900869A (en) * | 2014-03-03 | 2014-07-02 | 复旦大学 | Low-temperature molecular sieve adsorption pump device |
-
2014
- 2014-03-03 CN CN201420092484.2U patent/CN203758813U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900869A (en) * | 2014-03-03 | 2014-07-02 | 复旦大学 | Low-temperature molecular sieve adsorption pump device |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140806 Effective date of abandoning: 20160413 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |