JPH0340344Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a shutter device for an evaporation head that sprays an inert gas such as nitrogen gas or air onto the test liquid when heating the test liquid in a test tube. Regarding.

``Prior Art'' A conventional evaporation head as shown in FIG. 4 is known. That is, it has a chamber 1 into which an inert gas such as nitrogen gas or air is introduced, and elastic rubber plates 4 and 5 are attached to the inner surface of the top wall 2 and the inner surface of the bottom wall 3 of the chamber 1. 3 and the elastic rubber plate 5 with a large number of fitting holes,
A gas discharge nozzle 6 is fitted into each fitting hole so as to be vertically slidable. Then, a test solution 8 is poured into a test tube 7, and each test tube 7 filled with various test solutions 8 is fitted into each of the many holes 10 formed in an aluminum block 9 serving as a constant temperature bath. The test liquid 8 in each test tube 7 is heated via the block 9, and at this time, nitrogen gas, air, etc. are blown from each gas discharge nozzle 6 toward the test liquid 8 to prevent the formation of bubbles in the test liquid 8 due to boiling. This promotes evaporation of the solvent in the test solution 8, thereby increasing the concentration of the test solution 8.

On the other hand, the unused gas discharge nozzle 6 is moved upward to press the upper end of the gas discharge nozzle 6 against the elastic rubber plate 4, thereby closing the suction port 6a of the gas discharge nozzle 6 and discharging it into the test tube 7. This is designed to prevent waste of gas.

``Problem that the invention attempts to solve'' However, since the gas discharge nozzle 6 that is not in use is moved upward and the suction port 6a of the gas discharge nozzle 6 is closed with the elastic rubber plate 4, the suction may be caused by incorrect operation. It often happens that the opening 6a is not sufficiently closed by the elastic rubber plate 4, and after long-term use, the holding force of the gas discharge nozzle 6 by the hole edge of the fitting hole of the elastic rubber plate 5 decreases. This may cause the gas discharge nozzle 6 to move downward inadvertently and not sufficiently close the suction port 6a, or even cause the gas discharge nozzle 6 to fall from the chamber 1 and become unusable. I was getting used to it.

Therefore, in view of the above circumstances, the present invention has been developed to easily and easily block the unused gas discharge nozzles among a large number of gas discharge nozzles, and to do so without having to move the gas discharge nozzles in any way. To provide a shutter device for an evaporation head which can be firmly attached to a chamber and has excellent durability.

``Means that the invention attempts to solve'' This invention is based on an evaporation head in which a chamber into which gas is introduced has gas discharge nozzles vertically arranged in correspondence with a large number of test tubes into which test liquid is injected. An elastic membrane material is stretched above the suction ports of the gas discharge nozzles, and above the elastic membrane material, an evaporation plate is provided with a presser positioned directly above each gas discharge nozzle so as to be movable up and down. It features a shutter device with a shock head.

"Operation" In the above-mentioned means, the present invention moves the presser corresponding to the unused gas discharge nozzle downward to press the elastic membrane material, and with this pressure, the elastic membrane material is applied to the rim of the suction port. are in pressure contact with each other, and the elastic membrane material closes the suction port of the gas discharge nozzle.

Embodiment An embodiment of the evaporation head shutter device according to the present invention will be described below with reference to the drawings. First, the first embodiment will be described based on FIGS. 1 and 2. In the figures, reference numeral 11 denotes a main body case of a chamber A whose top surface is open. A large number of screw holes 12 are bored in the bottom wall 11a of the main body case 11. An attachment 13 is screwed into the screw hole 12.
The attachment 13 has a male screw 13a formed at its upper part, and a tapered truncated conical lower circumferential surface to form a fitting part 13 of the gas discharge nozzle 14.
b, and a gas introduction hole 13c extending from the upper surface to the lower surface is bored, and the upper surface opening of the gas introduction hole 13c serves as an inlet 13d. When the attachment 13 is screwed into the screw hole 12, the cylindrical portion above the male screw 13a protrudes further upward from the bottom wall 11a of the main case 11. Main case 1
The mounting position of the attachment 13 on the bottom wall 11a of the thermostatic chamber 1 is made to correspond to the position of a large number of holes in the aluminum block of the thermostatic oven having a well-known structure shown in FIG. A hose joint member 16 that communicates with the inside of the main body case 11 is attached to one side wall 11b of the main body case 11. An elastic membrane material 17 made of synthetic rubber or the like is stretched over the upper end of the side wall 11b of the main body case 11 at an appropriate distance from the suction port 13d of the attachment 13. The peripheral hanging edge of the lid 18 of the chamber A is attached to the upper end of the side wall 11b of the main body case and the peripheral edge of the elastic membrane material 17 using screws or the like. By such attachment, the elastic membrane material 17 seals the upper surface opening of the main body case 11 against the outside to prevent leakage. The lid body 18 has screw holes 19 located directly above the attachment 13, and a presser 20 is inserted into each screw hole 19.
Screw together.

And the hose joint part 16 of the main body case 11
Connect the hose on the gas cylinder side to the gas cylinder side, and attach the gas discharge nozzle 1 to the fitting part 13b of the attachment 13.
Insert 4. At this time, the gas discharge nozzle 14 is fitted into the attachment 13 only at the position corresponding to the test tube fitted into the hole in the aluminum block, and the gas discharge nozzle 14 is fitted into the attachment 13 corresponding to the hole in the aluminum block where no test tube is fitted. There is no need to fit the gas discharge nozzle 13. Next, the gas discharge nozzle 1 was inserted into the test tube fitted into the hole of the aluminum block.
Have them insert 4. Attachments 13 not used
The suction port 13d is closed by screwing in the pusher 20 to press the elastic membrane material 17, and bringing the elastic membrane material 17 into pressure contact with the rim of the suction port 13d. After that, connect chamber A from the gas cylinder through the hose.
In particular, a gas such as nitrogen gas or air is introduced between the main body case 11 and the elastic membrane material 17, and the gas is introduced into the gas introduction hole 13c of the attachment 13 and the gas discharge nozzle 1.
4 into the test tube. Since the suction port 13d of the unused attachment 13 is closed with the elastic membrane material 17, it goes without saying that gas will not flow into the attachment 13. The test solution in the test tube is heated via an aluminum block as in the conventional method, and at the same time gas is supplied from the gas discharge nozzle 14 to promote evaporation of the solvent and increase the concentration without boiling. Conversely, when the gas discharge nozzle 14 is fitted to the attachment 13 and used, turning the presser 20 in the opposite direction and separating it from the elastic membrane material 17 will reduce the elasticity of the elastic membrane material 17 itself. As a result, the pressure contact with the suction port 13d is released, and the suction port 13d opens to allow gas to flow in.

FIG. 3 shows a second embodiment, in which the lid body 18
A through hole 21 is formed in place of the screw hole 19, and an engaging recess 23 is formed in a part of the edge of the through hole 21. On the other hand, the shaft portion 22 of the presser 22 is inserted into the through hole 21.
Insert part a so that it can rotate and move up and down. An engaging protrusion 22b is provided protruding from the shaft portion 22a.
Further, the presser 22 is attached to the upper end of the shaft portion 22a.
It has a grip 22c with a larger diameter than 2a, and a return spring 24 is interposed between the grip 22c and the lid body 18.

Normally, the pusher 22 is made to protrude from the lid body 18 by the elastic force of the return spring 24, and the engagement protrusion 22b is fitted into the engagement recess 23.
In this state, the tip of the shaft portion 22a of the presser 22 does not press the elastic membrane material 17, so the elastic membrane material 17
Gas can flow into the gas introduction hole 13c of the attachment 13 without blocking the suction port 13d of the attachment 13, as in the above embodiment. When the gas discharge nozzle 14, that is, the attachment 13 is not used, the engagement protrusion 22b can be removed by rotating the grip 22c while pressing the pusher 22 against the elastic bias of the return spring 24.
is removed from the engaging recess 23 and engaged with the lowest end of the hole edge of the through hole 21 to maintain the downward movement state of the presser 22. The lower end of the shaft portion 22a of the presser 22 is connected to the elastic membrane material 1.
7 to bring the elastic membrane material 17 into pressure contact with the edge of the suction port 13d, thereby closing the suction port 13d.
When using the gas discharge nozzle 14 by fitting it into the attachment 13, turn the grip 22c to position the engagement protrusion 22b in the engagement recess 23, and the elastic force of the return spring 24 will push the presser 22. protrudes from the lid body 18, and the engagement protrusion 22b fits into the engagement recess 23. Then, the pressure on the elastic membrane material 17 by the shaft portion 22a is released, and the elastic membrane material 17
is separated from the edge of the suction port 13d, and the suction port 13d opens.

Note that the portions of the elastic membrane material 17 that are pressed by the tips of the pressers 20 and 21 may be made thicker or may have metal seats attached thereto.

"Effects of the Invention" As described above, according to the shutter device of the evaporation head according to the present invention, it is possible to easily and easily block the unused gas discharge nozzles among a large number of gas discharge nozzles. There is no need to move the nozzle, the gas discharge nozzle can be firmly attached to the chamber, and it has excellent durability, making it extremely convenient to use.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a first embodiment of a shutter device for an evaporation head according to the present invention, and FIG. 2 is a longitudinal sectional view of the shutter device for an evaporation head according to the first embodiment. FIG. 3 is a sectional view of essential parts of a shutter device for an evaporation head according to a second embodiment, and FIG. 4 is a longitudinal sectional view of a conventional shutter device for an evaporation head. DESCRIPTION OF SYMBOLS 11...Main body case, 13...Attachment, 13d...Intake port, 14...Gas discharge nozzle, 17...Elastic membrane material, 18...Lid body, 20,2
1... Presser.

Claims (1)

[Scope of utility model registration request] In an evaporation head in which gas discharge nozzles are vertically installed in a chamber into which gas is introduced in correspondence with a large number of test tubes into which test liquid is injected, above the inlet of the gas discharge nozzle in the chamber,
An elastic membrane material is stretched, and above the elastic membrane material,
A shutter device for an evaporation head, characterized in that a presser is positioned directly above each gas discharge nozzle and is movable up and down.