JPH046859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a cryostat applied to test a measurement piece under a constant low temperature atmosphere.

"Prior Art" The cryostat mentioned above has a configuration in which a sample tank is filled with a refrigerant such as liquid nitrogen or liquid helium to create a constant low temperature atmosphere, and the measurement piece is placed in this atmosphere. However, as shown in Fig. 1, the conventional type has a structure in which the measuring piece a is directly immersed in the coolant c stored in the sample tank b, so when taking out or replacing the measuring piece a, ,
Problems include the fact that when the lid is opened, the refrigerant c is wasted by evaporation, and if it is to be used again, the refrigerant must be replenished, and it takes time to create a constant low temperature atmosphere. It had

"Problems to be Solved by the Invention" The present invention is an attempt to solve the above-mentioned conventional problems, and involves storing a refrigerant in the inner tank of an insulated multiple tank, and holding a sample tank immersed in the refrigerant. A sample insertion tank is fixedly installed in a hollow cylinder, and a sample insertion tank is connected to a sample withdrawal tube and fixed in a removable manner within the sample tank. is semi-fixed by suspending a plurality of shielding plates and the lid plate of the sample tank at predetermined intervals by a flexible linking body, and connects the sample retrieval part at the top of the insulated multiple tank and the sample tank. By arranging a shield plate that can be slid open and closed to shield the sides from each other, the measurement piece does not come into contact with the refrigerant, and even when the measurement piece is taken out or replaced, the interior is always protected. The objective is to provide a cryostat that can maintain the refrigerant at a constant temperature and prevent the refrigerant from evaporating and dissipating.

``Embodiment'' The present invention will be described in detail based on the illustrated embodiment. As shown in FIGS. 4, sample withdrawal tube 5, opening/closing shielding plate 6, multiple shielding plates 7...
The main components are:

That is, the above-mentioned heat-insulating multiple tank 1 includes outer tanks 1a of different diameters,
It is formed of an intermediate tank 1b, an inner tank 1c, and a lid plate 1d. The tank 1b has the support tube 1e fixed through its top wall 1g, and further includes:
By connecting the intermediate tank 1b and the inner tank 1c with a pipe 1h at their respective bottoms, the three tanks 1a, 1b, and 1c are fixed at a desired distance from each other, The above outer tank 1a and intermediate tank 1b
A space 1i between and a space 1j between the intermediate tank 1b and the inner tank 1c are formed by the lid plate 1d and the top wall 1g of the intermediate tank.
A vacuum heat insulating layer is created by drawing a vacuum from nozzles 1k and 1l provided respectively.

The cover plate 1d is removably and airtightly fastened to the flange 1a' of the outer tank 1a with 1m bolts, and a cylindrical sample is placed in the center of the cover plate 1d. A refrigerant supply port 9 is provided around the outlet portion 8 and the outlet portion 8, respectively.

On the other hand, the sample tank 2 includes an outer tank 2a, a first intermediate tank 2, and a first intermediate tank 2a whose diameter and length are made smaller in multiple stages.
b. The second intermediate tank 2c and the inner tank 2d are integrally formed by concentrically connecting the bottoms of each tank with a connecting pipe 2e, with the required spacing maintained between each tank. In this sample tank 2, the outer tank 2a is connected to the lower end of the hollow cylinder 4 which is vertically disposed from the center of the back surface of the cover plate 1d in the heat insulating multiple tank 1. It is suspended in the inner tank 1c, and is therefore kept immersed in the refrigerant 10 stored in the inner tank 1c.

Further, the sample tank 2 has a hollow cylinder 4 connected to the lid plate 1d.
By being vertically disposed from the center of the tube, it is coaxially communicated with the sample extraction section 8 through the inside of the hollow tube 4.

As clearly shown in FIG. 5, the sample loading tank 3 includes a main body 3a formed with an outer dimension smaller than the inner dimension of the inner tank 2d in the sample tank 2, and an opening of the main body 3a. Lid body 3 that is detachably attached
A holding portion 3c for holding the material 11 is formed on the back side of the lid body 3b, and the sample extraction tube 5 is connected to the center of the upper surface, and the hollow tube 4 The flange 5a is airtightly fastened to the flange 8a of the sample extraction port 8 by bolting or the like so that it can be freely attached and detached, and the sample withdrawal tube 5 passes through the hollow tube 4 and the sample extraction port 8, It passes through the flange 5a in an airtight manner, and in this way, the sample loading tank 3 is installed inside the inner tank 2d of the sample tank 2 so that it can be inserted into and removed from the inner tank 2d.

Here, since the inner surface of the inner tank 2d is tapered as clearly shown in FIG. 5, the sample loading tank 3 is placed on the tapered surface.

The above-mentioned opening/closing shielding plate 6 is formed into a flat plate shape, and is a guide provided horizontally at the boundary between the hollow cylinder 4 and the sample extraction port 8 in the lid plate 1d of the heat-insulating multiple tank 1. It is slidably fitted into the groove 1n, thereby making it possible to shut off the sample outlet 8 and the sample tank 2 side when the sample 11 is taken out or replaced.

Here, it is preferable that the opening/closing shielding plate 6 can be opened and closed by rotating a lever 12 rotatably supported on the cover plate 1d. In this case, the shielding plate 6 and the lever 12 are As the interlocking connection means, a rack and pinion system can be adopted.

Furthermore, a plurality of shielding plates 7, 7, 7, 7 are provided between the upper flange 5a through which the sample draw-out tube 5 passes and the sample insertion tank 2 between the hollow tube 4 and the draw-out tube 5. ...and each cover plate 2a', 2b', 2c', 2d' of the outer tank 2a, first intermediate tank 2b, second intermediate tank 2c, and inner tank 2d in the sample tank 2 is made of flexible material such as thread. It has a semi-fixed configuration in which it is suspended by the sex connectors 14, 14 at predetermined intervals in the vertical direction.

Here, each of the above-mentioned shielding plates 7... and each cover plate 2a', 2
b', 2c', 2d' are disk-shaped in the illustrated example, and have center holes 15, 16 passing through them as shown in FIG. The cover plates 2a', 2b', 2c', 2d are fitted in the tube 5 in a sliding manner, and by moving the sample loading tank 3 upward by the upward movement of the withdrawal tube 5, each cover plate 2a', 2b', 2c', 2d ' and the shielding plates 7, 7, . . . are stacked on top of the sample loading tank 3, as shown in FIG. 3, and can be lifted up.

Further, the sample extraction port 8 is provided with a nozzle 13 for evacuation.

In the above configuration, in order to test a measurement piece under a constant temperature atmosphere using this, with the lid 3b of the sample loading tank 3 taken out from the main body 3a,
The measurement piece 11 is charged and held in the sample holding part 3c,
The measurement piece 11 is stored in the sample loading tank 3 by fixing the lid 3b to the main body 3a.

Next, hold the sample withdrawal tube 5 and insert the sample loading tank 3 into the sample takeout port 8, but in this state, the opening of the sample takeout port 8 is open, so the opening/closing shield plate 6 must be slid. Then, the sample outlet 8 and the sample tank 2 side are shut off.

Next, once the flange 5a of the sample extraction tube 5 is fixed to the flange 8a of the sample extraction port 8 with bolts, the nozzle 13
After drawing a vacuum with It is placed inside the inner tank 2d of the tank 2.

By doing this, the plurality of shielding plates 7, 7, etc., which are suspended by the linking bodies 14, 14 at predetermined intervals, can be placed in the hollow tube 4, vertically and vertically, as shown in FIG. The cover plates 2a', 2b', 2 of each tank 2a, 2b, 2c, 2d in the sample tank 2 are
c' and 2d' are placed in a semi-fixed state at positions that close their respective openings.

As a result, the inside of the sample tank 2 is cut off from the sample take-out port 8 in multiple ways, and therefore the inside of the sample tank 2, which is in the inner tank 1c of the heat-insulating multiple tank 1 and is immersed in the refrigerant 10, is The measurement piece 11 stored in the sample loading tank 3 can be maintained at a constant temperature atmosphere.
is placed in an atmosphere at a constant temperature in a non-contact state with the refrigerant 10.

Next, when taking out the measurement piece 11, first pull up the sample extraction tube 5 in the state shown in FIG.
The sample loading tank 3 is pulled up from inside the sample tank 2 as shown in FIG.
Each cover plate 2a', 2b', 2 of a, 2b, 2c, 2d
c' and 2d' are sequentially placed on the upper part of the sample loading tank 3 as they are pulled up, and a plurality of shielding plates 7
... are sequentially placed on the cover plates 2a' to 2d', and when the sample loading tank 3 is pulled up to the sample extraction port 8, each of the cover plates 2a' to 2d' and each shielding plate 7... are placed in a stacked state on the sample loading tank 3 as shown in FIG.

Once the sample loading tank 3 has been pulled up to the sample take-out port 8, the opening/closing shield plate 6 is slid to shut off the sample take-out port 8 and the sample tank 2 side as shown in FIG. Therefore, the vacuum insulation area is cut off from the outside, and air is taken in through the nozzle 13 to bring it to atmospheric pressure.

Next, by unfastening the flange 5a and pulling up the sample withdrawal tube 5, the sample loading tank 3 is taken out to the outside.

As explained above, according to the cryostat according to the present invention, the refrigerant 10 is stored in the inner tank 1c of the heat-insulating multiple tank 1 made up of a plurality of tanks, and the refrigerant 10
The sample tank 2 is suspended by a hollow cylinder 4 while immersed in water, and the sample tank 2 is passed through the hollow cylinder 4 into the sample tank 2.
By fixing the sample loading tank 3 at the sample take-out port 8 with the sample draw-out tube 5 so that it can be inserted and removed freely, it is installed inside the sample tank 2, and the opening/closing shield plate 6 can be slid into the sample take-out port 8. Furthermore, between the upper flange 5a through which the sample draw-out tube 5 passes and the sample loading tank 3, the sample draw-out tube 5 and the hollow tube 4 are installed.
Multiple shielding plates 7 in the vacuumed sky
... and the lid plate 2a'... of the sample tank 2 are suspended by flexible linking bodies 14, 14 at predetermined intervals to maintain a semi-fixed state, thereby opening the sample tank 2. At the same time, the sample tank 2 side and the sample take-out port 8 are kept closed by the shielding plates 7, and when the measurement piece 11 is inserted or taken out, the Since the opening/closing shielding plate 6 is configured to isolate the sample retrieval port 8 from the sample tank 2 side and freely isolate the vacuum insulation area from the outside, in the conventional example, when replacing the measurement piece, the sample is stored. The refrigerant contained in the refrigerant evaporates to the outside, and the refrigerant had to be refilled when storing the measurement piece again.In contrast, in the present invention, the measurement piece 11 and refrigerant 10 are connected in a non-contact manner, The space between the sample tank 2 and the refrigerant 10 is always in a vacuum insulation atmosphere, and a sample loading tank 3 is installed inside the sample tank 2. In addition, the opening of the sample tank 2 is kept closed with a plurality of shielding plates 7, and when the measuring piece 11 is replaced, etc., the opening/closing shielding plate 6 is used to prevent the sample from being taken. Since the outlet part 8 and the sample tank 2 side are shut off, the vacuum insulation area can be kept shut off from the outside even when the measuring piece 11 is replaced, so the measuring piece can always be stored in a constant temperature atmosphere. There are also advantages such as being able to prevent evaporation of the refrigerant 10.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view illustrating a conventional cryostat, Fig. 2 is a longitudinal sectional front view illustrating a cryostat according to the present invention in a state in which a measurement piece is stored, and Fig. 3 is a longitudinal sectional front view illustrating a conventional cryostat. Fig. 4 is a longitudinal front view of the same cryostat with the sample loading tank pulled up to the sample outlet, and Fig. 5 shows the sample tank and sample of the same cryostat. FIG. 3 is an enlarged longitudinal sectional front view of the charging tank. 1... Insulated multiple tank, 1d... Cover plate of the insulated multiple tank, 1
n...Guide groove, 2...Sample tank, 2a...Outer tank, 2b...First intermediate tank, 2c...Second intermediate tank, 2d...Inner tank, 2
a', 2b', 2c', 2d'...cover plate, 3...sample loading tank,
4...Hollow cylinder, 5...Sample withdrawal tube, 6...Opening/closing shielding plate,
7... Shielding plate, 8... Sample extraction port, 10... Refrigerant, 1
DESCRIPTION OF SYMBOLS 1...Measurement piece, 12...Lever, 14...Flexible link.

Claims (1)

[Claims] 1. A heat-insulating multiple tank including a plurality of tanks, and a sample tank fixed to the upper part of the heat-insulating multiple tank by a hollow cylinder while immersed in a refrigerant stored in an inner tank of the heat-insulating multiple tank. and a sample loading tank that is removably inserted into the sample tank through the hollow cylinder and supported by a sample extraction port provided at the top of the heat-insulating multiple tank by a sample pull-out pipe; An opening/closing shield plate is slidably disposed on the upper part of the heat-insulating multiple tank so that the sample loading tank can be freely put in and taken out of the sample tank and the sample take-out port can be shut off from the sample tank side. Between the sample loading tank and the upper flange through which the sample withdrawal tube passes, a plurality of shielding plates are provided in the evacuated space between the withdrawal tube and the hollow cylinder;
A cryostat characterized in that the lid plate of the sample tank can be suspended at a desired interval by a flexible linking body so that it can be inserted and removed, so that the cryostat can be in a semi-fixed state. 2. The cryostat according to claim 1, wherein the sample tank is formed by arranging and fixing a plurality of tanks spaced apart from each other substantially concentrically. 3 A plurality of shielding plates and a lid plate of the sample tank are slidably attached to the sample draw-out tube while being suspended by a flexible linking body, thereby allowing the sample loading tank to be opened. The cryostat according to claim 1, wherein the cryostat is formed so as to be pulled out in a state in which the cryostat is placed on top of the cryostat. 4. The opening/closing shield plate is located in a guide groove provided in the lid plate of the heat-insulating multiple tank, and is internally installed so that it can be slid open and closed in conjunction with a lever that is rotatably supported on the lid plate. Claim 1
Cryostat described in section.