JPH048982Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to an improved configuration of a dehumidifying device used, for example, in various gas concentration measuring instruments, and in particular to preventing liquid sealing of gas passages within the device. Regarding.

(B) Prior Art Conventionally, this type of dehumidification device has been used for measuring gas concentration in a thermostatic chamber, as shown in, for example, Japanese Patent Application Laid-Open No. 110284/1984. In other words, when measuring the concentration of this type of gas, changes in the humidity of the sample gas to be measured greatly affect the measurement accuracy, so in order to keep the humidity of the sample gas constant, a refrigeration cycle in which refrigerant is circulated by a compressor is used. A dehumidifying device is configured with a refrigeration cycle cooler, and the sample gas is cooled and forcibly dehumidified to keep the humidity constant.

In a dehumidifying device using such a refrigeration cycle, the device itself becomes large and vibrations of the compressor become a problem, making it unsuitable for such measuring instruments. Therefore, conventional dehumidifiers have been considered in which a thermoelectric cooling element made of a semiconductor thermoelectric element that utilizes the Seebeck effect is used.

(c) Problems to be solved by the invention Conventional dehumidification device 10 using such a thermoelectric cooling element
0 is shown in FIG. 5 and FIG. 6, which is a sectional view thereof.
101 is a block made of stainless steel, and the block 101 has passages 10 extending vertically and parallel to each other.
Passages 104 extending left and right are formed through the block 101 so as to communicate the passages 102, 103 at the lower portions thereof. Passage 102
This is also a stainless steel pipe 10 from the top and bottom.
5 and 106 are inserted and fixed by welds B and B, and a stainless steel pipe 107 is also inserted into the passage 103 from above and fixed by welds B.
Further, both sides of the passage 104 and the lower end of the passage 103 are also closed by welding B, B, B. The reason why the block 101 and the pipes 105, 106, and 107 are made of stainless steel is to prevent corrosion due to contact with various gases. pipe 10
A drain pipe P is connected to 6, and the drain pipe P is immersed in the water L in the drain tray W and is sealed with liquid. A is a thermoelectric cooling element in the form of a rectangular plate, and when a DC voltage is applied, it absorbs heat from the heat absorption side A1 and radiates heat from the heat radiation side A2. This thermoelectric cooling element A has its heat absorption side A
1 is attached to one side of the block 101 in a heat conductive relationship. That is, since the thermoelectric cooling element A has a flat plate shape, a rectangular block 10 having a flat outer surface is used to improve heat conduction.
1 is required. R denotes a heat radiation fin, which is attached to the heat radiation side A2 of the thermoelectric cooling element A via an aluminum block D, and the parts other than the fin R are surrounded by a heat insulating material I.

The operation of the dehumidifier 100 is to suck in sample gas from a pipe 105 and
After passing through, it is discharged from pipe 107.
The pipe 107 is connected to a concentration detection device (not shown), which detects the concentration of a predetermined gas in the sample gas. The sample gas is in the passages 102, 10.
4,103, it is cooled by the thermoelectric cooling element A through the wall surface of the block 101, and the moisture in the gas condenses, dehumidifying the gas to approximately 100% humidity.
%, and the condensed water is transferred to the pipe 106.
more excreted. As a result, the humidity of the sample gas becomes constant at approximately 100%, and the measurement accuracy of the gas concentration is good.
3 has a U-turn shape as a whole, so moisture condensed in the passages 104 and 103 becomes a headwind and cannot move in the direction of the pipe 106, causing the problem that the passage is sealed and gas does not flow. . Furthermore, since a corrosion-resistant stainless steel block 101 must be used, the passages have no choice but to be formed as shown in FIG. 6, and a large number of welding operations B, B, etc. are required.

(d) Means for solving the problem In order to solve the problem, the present invention has a corrosion-resistant and thermally conductive cylinder 18 that extends vertically, and the upper and lower ends of this cylinder. Exposing the cylindrical body 18
Thermally conductive blocks 21 and 22 are arranged so as to surround the outer surface for heat exchange and form a flat surface on the outer surface.
The dehumidifying device 4 is composed of a thermoelectric cooling element A provided on the flat surface of the block 21 for heat exchange, and a gas inflow section 24 and a drainage section 18A formed at the lower part of the cylindrical body.

(E) Effect According to the present invention, a dehumidifying device can be constructed with a simple structure. Further, condensed water from the gas to be dehumidified is well discharged and no clogging occurs.

(F) Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In the figure, the same reference numerals as in FIGS. 5 and 6 are the same. Figure 4 shows a block diagram when the present invention is used to measure the CO ₂ gas concentration in a constant temperature bath for bacterial culture. Reference numeral 1 denotes a constant temperature bath, the interior of which is kept at high humidity by a humidifier 2 and maintained at a constant temperature of, for example, 30° C. by a temperature control device (not shown). A sample gas is led out from inside the constant temperature chamber 1 through a lead-out pipe 3, flows into the dehumidifier 4 of the present invention, is dehumidified there, and the gas is sent to the upper CO ₂ concentration detector 5, while the condensed water is sent to the drain pipe P. Drainage tray L
is discharged. The temperature of the dehumidifier 4 is detected by a temperature detection device 6, and the information is sent to a temperature control device 7.
The temperature control device 7 controls a thermoelectric cooling element, which will be described later, so that the dehumidification device 4 can, for example,
It is designed to be kept cool at a constant temperature of 5°C. The sample gas that passed through the dehumidifier 4 was +5℃
The humidity is approximately 100% by being cooled to
Since the CO ₂ concentration detector 5 is used, the measurement accuracy is very good. Circulation of this sample gas is created by a blower 8, and the gas that has passed through the CO ₂ concentration detector 5 passes through an outflow pipe 9, is accelerated by the blower 8, and is sent from a return pipe 10 to a constant temperature chamber 1 as shown by the solid line arrow in the figure. returned inside. 12 is a CO ₂ gas cylinder, and the concentration control device 13 opens and closes the valve 14 based on the information from the CO ₂ concentration detector 5, so that the gas is supplied from the supply pipe 15.
The CO ₂ gas is made to flow into the return pipe 10 to maintain a substantially constant CO ₂ concentration inside the thermostatic chamber 1. This dehumidification device 4 and CO ₂ concentration detector 5 constitute a CO ₂ concentration detection device 16 .

FIG. 1 shows a perspective view of the CO ₂ concentration detection device 16.
Further, FIG. 2 shows a sectional view of the same. 18 is a cylindrical straight stainless steel pipe, and this stainless steel pipe 18
are held between aluminum blocks 21 and 22, which have grooves 19 and 20 each having a semicircular arc cross section formed on the outside thereof so as to be in close contact with each other for heat conduction. The aluminum blocks 21 and 22 are fixed to each other by screws or welding while holding the stainless steel tube 18 between them, but there is no need to seal them. Alternatively, a hole having a circular cross section may be formed in a single aluminum block, and the stainless steel tube 18 may be inserted through the hole. This stainless steel tube 18 is arranged so as to extend in the vertical direction. The aluminum blocks 21 and 22 have a rectangular shape as a whole, and the heat absorption side A _{1 of the thermoelectric cooling element A is provided on the flat surface, which is the outer surface of the aluminum block 21 on the opposite side from the stainless steel pipe 18} , for heat exchange. Furthermore, a heat radiation fin R is attached to the heat radiation side _A2 via an aluminum block D.

An inflow pipe 24 is fixed to the side wall of the stainless steel pipe 18 located below the aluminum blocks 21 and 22 by welding B, and the inflow pipe 24 is connected to the outlet pipe 3. That is, this is the only location to be welded and sealed, and welding work can be significantly reduced compared to the conventional method. Further, the upper end of the stainless steel tube 18 is made to protrude slightly from the aluminum blocks 21 and 22. 25 is a synthetic resin casing with openings 2 on the top, bottom and side walls.
6, 27, and 28, respectively, and with the upper end of the stainless steel pipe 18 inserted into the opening 27 of the lower wall,
It is fixed to the upper ends of the aluminum blocks 21 and 22 via a sealing material 29 with screws or the like. An aluminum tape 30 is provided between the casing 25 and the aluminum blocks 21 and 22, and serves as a heat transfer member for cooling the inside of the casing 25 at the temperature of the aluminum blocks 21 and 22, and as a member that connects the two. It is not necessary if the casing 25 is made of a good thermal conductor such as stainless steel. The CO ₂ concentration detector 5 is connected to the opening 26 of the casing 25.
is inserted and sealed. 32 is the concentration control device 1
This is the lead wire to 3. Further, an outflow pipe 9 made of resin is connected to the opening of the casing 25. A temperature detection device 21 is attached to the outer surface of the aluminum block 21,
The lower end of the stainless steel pipe 18 and the heat dissipating fin R are surrounded by a heat insulating material I in an exposed state. In this state, the lower end of the stainless steel pipe 18 is a drainage part 18A,
A drain pipe P is connected here, and the pipe P is immersed in the water L in the drain tray W.

Next, the operation will be explained. The gas (sample gas) in the thermostatic chamber 1 is sucked by the blower 8 and flows into the inflow pipe 2.
4 into the stainless steel pipe 18, and the second
It rises as shown by the solid line arrow in the figure. stainless steel pipe 18
is cooled by thermoelectric cooling element A via aluminum blocks 21 and 22, and approximately +
The sample gas is maintained at a constant temperature of 5°C, and as it rises, it is cooled and the moisture in it condenses on the inner wall of the stainless steel tube 18. It falls as indicated by the broken line arrow in the figure, flows into the drain pipe P from the drain section 18A, and is discharged. Therefore, the ventilation passage will not be clogged with condensed water. stainless steel pipe 1
The sample gas rising inside the casing 25 is dehumidified to approximately 100% humidity and flows into the casing 25, where the concentration is detected by the CO ₂ concentration detector 5 and then sent to the blower 8 through the outflow pipe 9. It will be attracted.

By keeping the humidity constant in this way, the measurement accuracy of CO ₂ concentration improves, but the aluminum block 2
Since the inside of the casing 25 is also cooled to a constant temperature of approximately +5° C. by heat conduction from the detectors 1 and 22, errors caused by the temperature of the detector 5 can be eliminated at the same time, and measurement accuracy is further improved. Also, casing 2
5 on the aluminum blocks 21 and 22 for heat exchange, the CO ₂ concentration detection device 16 itself can be made smaller. In addition, in the example, the present application was applied to a CO ₂ concentration detection device in a constant temperature bath, but it is not limited to this.
It can be applied to various devices.

(g) Effects of the invention As detailed above, according to the invention, the part of the cylindrical body that is surrounded by the thermally conductive block and is indirectly cooled by the thermoelectric cooling element (i.e., the dehumidifying part) There are no joints with the suction and discharge pipes in the chamber), and the number of parts to be sealed by welding can be significantly reduced, simplifying the assembly work as a defrosting device, and making it possible to use thermoelectric cooling elements. The cooling efficiency of the cylindrical body can be improved, and the dehumidification and cooling of the gas passing through the cylindrical body can be promoted.

[Brief explanation of drawings]

Figures 1 to 4 show examples of the present invention. Figure 1 is a perspective view of a CO ₂ concentration detection device, Figure 2 is a sectional view of the same side, and Figure 3 is an aluminum block attached to a stainless steel pipe. A perspective view of the state, Figure 4 shows CO ₂ in the constant temperature chamber.
FIG. 5 is a block diagram for explaining the gas concentration measurement operation; FIGS. 5 and 6 show a conventional example;
The figure is a perspective view of the dehumidifying device, and FIG. 6 is a sectional view of the same side. 4...Dehumidifier, 18...Stainless steel pipe, 18
A... Drainage section, 21, 22... Aluminum block,
24...Inflow pipe, A...Thermoelectric cooling element.

Claims (1)

[Scope of utility model registration request] A corrosion-resistant and thermally conductive cylindrical body extending vertically;
A thermally conductive block is arranged for heat exchange so as to expose the lower part of the cylindrical body and surround the outer surface of the cylindrical body, and has a flat surface on the outer surface, and a thermoelectric block is provided for heat exchange on the flat surface. A dehumidifying device comprising a cooling element, and a gas inflow section and a drainage section formed at the bottom of the cylindrical body.