CN86207559U - Liquid level indicating and alarm device for liquid nitrogen container - Google Patents
Liquid level indicating and alarm device for liquid nitrogen container Download PDFInfo
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- CN86207559U CN86207559U CN 86207559 CN86207559U CN86207559U CN 86207559 U CN86207559 U CN 86207559U CN 86207559 CN86207559 CN 86207559 CN 86207559 U CN86207559 U CN 86207559U CN 86207559 U CN86207559 U CN 86207559U
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- liquid level
- probe
- liquid nitrogen
- liquid
- light emitting
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Abstract
The utility model relates to a liquid level indicating and alarming device for a liquid nitrogen container (Dewar flask), which can indicate a plurality of states, such as liquid level below certain liquid level, the liquid level above certain liquid level and normal liquid level. The liquid level indicating and alarming device for a liquid nitrogen container (Dewar flask) takes a light emitting diode as a probe sensor, a sound indicator and a light indicator make indication by a comparator composed of a field effect transistor and a diode, and an output signal. In addition, the probe has retractability, and an electrical source is in types of alternating current and direct current. The liquid level indicating and alarming device for a liquid nitrogen container (Dewar flask) is suitable for a liquid nitrogen container and is particularly suitable for liquid nitrogen preservation of biological samples and liquid nitrogen canning. The utility model has the advantages of simple structure and reliable effect.
Description
The utility model is that the liquid nitrogen liquid level in the cryogenic technique field monitors apparatus, the safety guard in the time of also can being used for biological products, agriculture and animal husbandry department product (as bull sperm) and placing preservation liquid nitrogen under.
The small-sized liquid nitrogen container that China produces and the biological Dewar type container of existing import all are not with the liquid level warning device.When perfusion was liquid, for guaranteeing the container life-span, liquid should not be higher than bottleneck, and this point is judged with people's experience entirely.When utilizing liquid nitrogen to preserve article, because the performance difference of Dewar type container, the number of deposit such as biological products has different, makes the consumption of liquid nitrogen be difficult to correct estimation, in order to check the liquid level height, the staff inserts container bottom with rod, extract visual frosting line after cooling and judge that precision is not high and too loaded down with trivial details, during work mistake, because liquid nitrogen consumption is too much, cause the downright bad situation of biological products intensification to happen occasionally, sometimes with a toll of more than ten thousand yuan.Existing be used to test and liquid nitrogen liquid level meter that air separation plant etc. is located, mainly contain condenser type, float-type and hydrostatic pressure type etc., but because of reasons such as complex structure or sensitivity are low, in biological Dewar, be not used.
Task of the present utility model is primarily aimed at biological Dewar type container, changes the artificial state of judging by experience that reaches of blindly measuring.Make a simple liquid nitrogen liquid level alarm, from the volume to the price, can both adapt to improving and promoting of biological Dewar.
Technical solution of the present utility model is:
1. adopt electron device to make sensitivities probe and critical piece, make warning device small and exquisite, be convenient to assembling, sensor probe adopts light emitting diode to detect liquid level, power unit provides power supply, probe sensor is contained in thermal insulation material such as the stainless-steel tube feeler lever, the sensor probe lead-in wire is introduced the comparer through field effect transistor and stabilivolt and other element composition, promote alarm work, alarm has a news Chinese percussion instrument (Y) at least, can also add the light emitting diode indicator, the various situations of indication liquid level.
2. for liquid level under the liquid nitrogen of key, can adopt the layout of Lazer's sensing unit, promptly can two sensors in parallel.As adopting a probe then only with popping one's head in down, sensitive element is a sensor.
3. employing sound, the parallel warning scheme of light warning are convenient to the operator on duty and are monitored (listening) in office.
4. distinguish overflowing of upper and lower liquid level respectively and be lower than the standard liquid level with the alarm song of the different sounds.
5. feeler lever can be designed to extension type as being made of the two-section pipe, and following control liquid level can optionally be regulated, and feeler lever is made with thermal insulation material.
6. consider from the angle of not only saving but also being suitable for, can adopt the scheme of power of alterating and direct current dual-purpose.
The utility model can reduce the burden that the operator on duty often measures and checks by the indication to liquid nitrogen liquid level in the liquid nitrogen container to the cryopreservation in the article.Avoid human error or Dewar type container performance to degenerate suddenly and the heat damage of thing such as biopreparate in causing.And adopt element few, circuit is simple, so cost is low, and good reliability is easy to use, and indication is directly perceived, is expected to be equipped with biological Dewar and promotes the use of.
Below the utility model is described in further detail by drawings and Examples:
Fig. 1 is the conspectus of liquid nitrogen liquid level indicator.
But alternating current after the transformer transformation rectification filtering through a three terminal regulator (WY) voltage stabilizing, (5) put and to disconnect with (6), when no alternating current, can connect direct supply, light emitting diode through screening is housed in the upper and lower liquid-level probe (S), (in liquid nitrogen voltage drop higher, it is lower to break away from the liquid nitrogen voltage drop), following probe can two light emitting diodes of parallel connection between (1), (2) with the increase factor of assurance, under as the figure voltage conditions, (2) some sending and receiving optical diode (S
1) positive pole, field effect transistor (BG
1, BG
2) constant current source is provided, with the parallel connection of popping one's head in down is (D
1), (R
1) (D
2), with last probe (R in parallel
2), (D
5), (D
6), (D
1) and (D
5) choose green and red light emitting diode respectively for distinguishing upper and lower liquid level, positive pole connects the positive source direction, stabilivolt (D
2), (D
6But) 2CW, the 2DW type, (D
3), (D
4), (D
7) be diode, connected mode as shown in Figure 1, (BG
1) draining meets (D
2) anodal and (1) end, and draw two lines and meet (D
3), (D
4) positive pole, (D
4) negative pole meets (D
2) anodal and (1) end, and draw two lines and meet (D
3), (D
4) positive pole, (D
4) negative pole meets (K) end that news are rung integrated circuit (IC), (D
3) negative pole meets the end to (A) of (IC), (D
7) positive pole meet (D
5) negative pole, negative pole connect (A) end.(b) termination (BG of (IC)
3) base stage, (BG
3) drive and interrogate Chinese percussion instrument (Y) sounding.
Probe (S) available stainless steel is made feeler lever, and following probe is fixed on the feeler lever head, and feeler lever can be made scalable bipartial, and last probe is fixed on one section.
Shown in wiring diagram, its course of work is as described below:
1. when upper and lower probe does not all immerse liquid nitrogen, sensitive element (S
1) and (S
2) forward voltage drop is all less, thereby (1) point is high level, (4) are put and are low level, reflect liquid level and the upward luminotron (D of liquid level state down
1), (D
5) all not conductings, because (1) is high level, so (A) point (K) point is high level on (IC) sheet, a kind of signal of (b) output makes (Y) send indication with a kind of sound.
2. (S pops one's head in down
1) the immersion liquid nitrogen, last probe (S
2) do not immerse, (1) point is low level, (D at this moment
1) conducting, green light shows liquid, and (K) and (A) all becomes low level, (BG simultaneously
3) also obstructed, show that liquid level is normal.
3. when upper and lower probe all immersed liquid nitrogen, (1) was low level, and (4) point is high level, (D
5) conducting, the luminotron of liquid level luminous (ruddiness) (D in the demonstration
7) also conducting, thereby (A) point is high level, (IC) work, (BG
3) conducting, (Y) indicates with another kind of sound.
Claims (4)
1, liquid nitrogen container (Dewar also) the liquid level indicating alarm device that belongs to the cryogenic technique field, form by power supply, shell etc., feature of the present utility model is that to select light emitting diode for use be sensor probe, feeler lever can be made with thermal insulation material, the sensor probe lead-in wire is introduced the comparator circuit that is made of field effect transistor and diode, and the different conditions of news Chinese percussion instrument indication liquid level can be indicated or pass through to comparator circuit output unlike signal by light emitting diode.
2,, it is characterized in that sensor probe can be designed to upper and lower two, last probe (S according to the indication alarm of claim 1
2) liquid level in the detection, following probe (S
1) survey liquid level down, if adopt a probe then only with probe (S down
1), following probe is a light emitting diode at least, also can the parallel connection of two light emitting diode same polarity directions.
3, according to the indication alarm of claim 1 or 2, it is telescopic as being made up of the two-section bar to it is characterized in that feeler lever can be made into.
4,, it is characterized in that power supply can be designed to the AC and DC double-purpose electric source according to the indication alarm of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86207559 CN86207559U (en) | 1986-10-16 | 1986-10-16 | Liquid level indicating and alarm device for liquid nitrogen container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86207559 CN86207559U (en) | 1986-10-16 | 1986-10-16 | Liquid level indicating and alarm device for liquid nitrogen container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86207559U true CN86207559U (en) | 1987-06-17 |
Family
ID=4809960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86207559 Withdrawn CN86207559U (en) | 1986-10-16 | 1986-10-16 | Liquid level indicating and alarm device for liquid nitrogen container |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86207559U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1831493B (en) * | 2006-04-10 | 2010-05-12 | 中国科学院电工研究所 | Liquid nitrogen liquid level measuring device for high voltage surperconducting power equipment |
-
1986
- 1986-10-16 CN CN 86207559 patent/CN86207559U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1831493B (en) * | 2006-04-10 | 2010-05-12 | 中国科学院电工研究所 | Liquid nitrogen liquid level measuring device for high voltage surperconducting power equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |