JPH0350976B2 - - Google Patents
Info
- Publication number
- JPH0350976B2 JPH0350976B2 JP2620283A JP2620283A JPH0350976B2 JP H0350976 B2 JPH0350976 B2 JP H0350976B2 JP 2620283 A JP2620283 A JP 2620283A JP 2620283 A JP2620283 A JP 2620283A JP H0350976 B2 JPH0350976 B2 JP H0350976B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid nitrogen
- cylinder
- bottle
- dua
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 56
- 239000007788 liquid Substances 0.000 claims description 32
- 229910052757 nitrogen Inorganic materials 0.000 claims description 28
- 238000002076 thermal analysis method Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 4
- 230000007423 decrease Effects 0.000 description 8
- 238000001816 cooling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
Landscapes
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Description
【発明の詳細な説明】
本発明は、走査熱量計、交流熱量計等に用いら
れる熱分析用低温装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low temperature apparatus for thermal analysis used in scanning calorimeters, alternating current calorimeters, and the like.
従来、この種の低温形成手段として、デユア瓶
内の液体窒素に均熱筒内に収納した熱量計を浸漬
し、その程度を加減することにより測定試料の温
度を任意に調節するようにすることが知られてい
る。 Conventionally, this type of low-temperature forming means involves immersing a calorimeter housed in a soaking cylinder in liquid nitrogen in a Dua bottle, and adjusting the degree of immersion to arbitrarily adjust the temperature of the measurement sample. It has been known.
しかしこの手段によれば、液体窒素の量が多く
必要であるとともに測定試料の冷却温度を任意の
値に設定したり、急速に冷却することは極めて困
難である不都合が存する。本発明はかかる不都合
の無い熱分析用低温装置を提供することをその目
的としたもので、液体窒素を収納して密閉したデ
ユア瓶内に、熱量計等の熱分析機器収納ケース及
びこれに連通する小径の筒体を配設して、該筒体
の下端を液体窒素に浸漬し、該ケースの少なくと
も１部及び該筒体の外壁に断熱被覆を施し、該筒
体内に液体窒素の液面計を設けるとともに、デユ
ア瓶内に連通孔を介して連なりデユア瓶内の液体
窒素面に加わる蒸気圧力を制御する制御弁を設
け、該制御弁で該蒸気圧力を制御することにより
前記筒体内の液体窒素面を昇降自在としたことを
特徴とする。 However, this method has disadvantages in that a large amount of liquid nitrogen is required and it is extremely difficult to set the cooling temperature of the measurement sample to an arbitrary value or to cool it rapidly. The object of the present invention is to provide a cryogenic apparatus for thermal analysis that does not have such inconveniences, and in which a storage case for thermal analysis equipment such as a calorimeter, etc. a cylinder with a small diameter is provided, the lower end of the cylinder is immersed in liquid nitrogen, at least a portion of the case and the outer wall of the cylinder are coated with heat insulation, and a liquid level of liquid nitrogen is provided in the cylinder. In addition to providing a control valve that is connected to the Dua bottle through a communication hole and controls the steam pressure applied to the liquid nitrogen surface in the Dua bottle, by controlling the vapor pressure with the control valve, the pressure inside the cylinder is The feature is that the liquid nitrogen surface can be raised and lowered freely.
以下本発明の実施例を図面につき説明する。 Embodiments of the present invention will be described below with reference to the drawings.
図において、１は液体窒素２が収納されたデユ
ア瓶で、該デユア瓶１は基台３の孔４に嵌入配置
され、合成樹脂製の蓋板５で密閉される。該蓋板
５はその中心部に嵌着された熱良導材からなる熱
量計等の熱分析機器収納ケース（以下単に収納ケ
ースという）６の下半部６ａ及びこれに係合する
上半部６ｂと該下半部６ａに連通する熱良導材か
らなる小径の筒体７と該収納ケース６の下半部６
ａ及び筒体７の外壁面を被覆する断熱材８を有す
るものである。前記筒体７の内面には、ねじ９が
切られており、該ねじ９内に嵌入された金属抵抗
線から成る液体窒素の液面計（以下単に液面計と
いう）１０が設けられている。前記筒体７の下端
は液体窒素２に浸漬する。 In the figure, reference numeral 1 denotes a dure bottle containing liquid nitrogen 2. The dure bottle 1 is fitted into a hole 4 of a base 3 and sealed with a lid plate 5 made of synthetic resin. The lid plate 5 includes a lower half 6a of a storage case for thermal analysis equipment such as a calorimeter (hereinafter simply referred to as a storage case) 6, which is made of a thermally conductive material and is fitted into the center thereof, and an upper half that engages with the lower half 6a. 6b, a small-diameter cylinder 7 made of a thermally conductive material communicating with the lower half 6a, and the lower half 6 of the storage case 6.
a and a heat insulating material 8 covering the outer wall surface of the cylindrical body 7. A thread 9 is cut on the inner surface of the cylinder 7, and a liquid nitrogen level gauge (hereinafter simply referred to as a level gauge) 10 made of a metal resistance wire is fitted into the thread 9. . The lower end of the cylinder 7 is immersed in liquid nitrogen 2.
図において、１１は蓋板５に設けられ、一端が
デユア瓶１内に連なり、他端が電磁制御弁１４に
連なる流通孔、１２は収納ケース６を覆い蓋板５
に載置される断熱蓋、１３は例えば熱量計の断熱
ケースである。 In the figure, reference numeral 11 is a communication hole provided in the lid plate 5, one end of which is connected to the inside of the Dua bottle 1, and the other end of which is connected to the electromagnetic control valve 14, and 12 is a communication hole that covers the storage case 6 and covers the lid plate 5.
The heat insulating lid 13 placed on is, for example, a heat insulating case for a calorimeter.
次に、本冷却装置の作用について説明する。 Next, the operation of this cooling device will be explained.
今、収納ケース６内に例えば熱量計を収納し、
測定試料の温度を時間に応じて変化するために、
流通孔１１に連なる電磁制御弁１４を制御し、デ
ユア瓶１内の蒸気圧を所定のプログラムで上昇さ
せると、筒体７内の液体窒素２の面はそれに応じ
て上昇する。その上昇により液体窒素２と接触す
る筒体７の面積は増大し、それに応じて収納ケー
ス６の温度は低下する。 Now, for example, a calorimeter is stored in the storage case 6,
To change the temperature of the measurement sample over time,
When the electromagnetic control valve 14 connected to the flow hole 11 is controlled to increase the vapor pressure in the Dua bottle 1 according to a predetermined program, the surface of the liquid nitrogen 2 in the cylinder 7 rises accordingly. Due to the rise, the area of the cylinder 7 that comes into contact with the liquid nitrogen 2 increases, and the temperature of the storage case 6 decreases accordingly.
筒体７内の液体窒素２のレベルが増減すると、
それに応じて液体窒素２と接触する液面計１０の
金属抵抗線の長さは増減するから、その抵抗は減
少あるいは増加し電流の増減としてレベルが計器
で表示される。デユア瓶１内の蒸気圧を更に上昇
させると、筒体７内の液体窒素２は孔を介して収
納ケース６内に侵入する。筒体７及び収納ケース
６内の液体窒素２面をデユア瓶１内の蒸気圧の上
昇により上昇させると、液体窒素２と接触する筒
体７及び収納ケース６の面積は増大するので、そ
れに応じて、収納ケース６の温度は更に低下す
る。 When the level of liquid nitrogen 2 in the cylinder 7 increases or decreases,
Correspondingly, the length of the metal resistance wire of the liquid level gauge 10 in contact with the liquid nitrogen 2 increases or decreases, so the resistance decreases or increases and the level is displayed on the meter as an increase or decrease in current. When the vapor pressure in the dure bottle 1 is further increased, the liquid nitrogen 2 in the cylinder 7 enters the storage case 6 through the hole. When the liquid nitrogen 2 surfaces in the cylinder 7 and the storage case 6 are raised due to the increase in vapor pressure in the Dua bottle 1, the areas of the cylinder 7 and the storage case 6 that come into contact with the liquid nitrogen 2 increase, so As a result, the temperature of the storage case 6 further decreases.
このように本発明によるときは、液体窒素面に
作用させる圧力により小径の筒体内の液体窒素面
を上下させ、筒体と液体窒素との接触面積を増減
させ、温度の低下を増減させたので、液体窒素の
量を比較的少なくすることができると共に急速な
冷却を行なうことができ、また液面計の読みを見
ながら、液体窒素面に作用させる圧力を調整する
ことにより所定の温度プログラムで冷却すること
ができる。更に液体窒素の蒸気圧力を利用してそ
のレベルを調整するので構成が簡単になる等の効
果がある。 In this way, according to the present invention, the pressure applied to the liquid nitrogen surface raises and lowers the liquid nitrogen surface inside the small diameter cylinder, increases or decreases the contact area between the cylinder and liquid nitrogen, and increases or decreases the temperature drop. , the amount of liquid nitrogen can be relatively small and rapid cooling can be performed, and by adjusting the pressure applied to the liquid nitrogen surface while monitoring the readings on the liquid level gauge, it is possible to maintain a predetermined temperature program. Can be cooled. Furthermore, since the vapor pressure of liquid nitrogen is used to adjust its level, the structure can be simplified.
図面は本発明の一実施例の一部截断側面図を示
す。
１…デユア瓶、２…液体窒素、６…収納ケー
ス、７…筒体、８…断熱材、１０…液面計、１４
…電磁制御弁。
The drawing shows a partially cut-away side view of an embodiment of the invention. 1... Dua bottle, 2... Liquid nitrogen, 6... Storage case, 7... Cylindrical body, 8... Insulating material, 10... Liquid level gauge, 14
...Solenoid control valve.
Claims (1)
熱量計等の熱分析機器収納ケース及びこれに連通
する小径の筒体を配設して、該筒体の下端を液体
窒素に浸漬し、該ケースの少なくとも１部及び該
筒体の外壁に断熱被覆を施し、該筒体内に液体窒
素の液面計を設けるとともに、デユア瓶内に連通
孔を介して連なりデユア瓶内の液体窒素面に加わ
る蒸気圧力を制御する制御弁を設け、該制御弁で
該蒸気圧力を制御することにより前記筒体内の液
体窒素面を昇降自在としたことを特徴とする熱分
析用低温装置。1 In a sealed Dua bottle containing liquid nitrogen,
A case for storing thermal analysis equipment such as a calorimeter and a small-diameter cylinder connected to the case are provided, the lower end of the cylinder is immersed in liquid nitrogen, and at least a portion of the case and the outer wall of the cylinder are insulated. A liquid nitrogen level gauge is provided in the cylindrical body, and a control valve is provided in the Dua bottle via a communication hole to control the vapor pressure applied to the liquid nitrogen surface in the Dua bottle. A cryogenic apparatus for thermal analysis, characterized in that the liquid nitrogen surface within the cylinder can be raised and lowered by controlling the vapor pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2620283A JPS59153155A (en) | 1983-02-21 | 1983-02-21 | Low temperature apparatus for thermal analysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2620283A JPS59153155A (en) | 1983-02-21 | 1983-02-21 | Low temperature apparatus for thermal analysis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59153155A JPS59153155A (en) | 1984-09-01 |
| JPH0350976B2 true JPH0350976B2 (en) | 1991-08-05 |
Family
ID=12186881
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2620283A Granted JPS59153155A (en) | 1983-02-21 | 1983-02-21 | Low temperature apparatus for thermal analysis |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59153155A (en) |
-
1983
- 1983-02-21 JP JP2620283A patent/JPS59153155A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59153155A (en) | 1984-09-01 |
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