JPH0714854Y2 - Dehumidifier for analysis gas - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial application field} The present invention is, for example, when the gas contained in various exhaust gases or the atmosphere is analyzed by an infrared gas analyzer, the moisture contained in the measured gas is used. The present invention relates to a dehumidifier using an electronic cooling element used to remove the.

{Prior Art} As a dehumidifier using an electronic cooling element for removing moisture contained in a measurement gas, for example, the one shown in FIG. 3 is known.

In FIG. 3, reference numeral 21 denotes an electronic cooling element, which is supported from both sides by support plates 22a, 22b made of an insulating material such as ceramic, and is filled in the entire circumference between the pair of support plates 22a, 22b. The electronic cooling element 21 is enclosed between the support plates 22a and 22b by the formed sealing wall 23 made of silicon rubber as a sealing material to form a cooler 24.

25 is a heat exchanger stacked on the support plate 22a which is the cooling surface side of the cooler 24, and between this heat exchanger 25 and the cooler 24,
Silicon grease film 26 to improve their heat conduction
Is intervening. Reference numeral 28 denotes a gas supply pipe that penetrates through the heat exchanger 25, to which the measurement gas to be dehumidified is supplied. Reference numeral 29 denotes a heat radiating member which is arranged on the side of the support plate 22b which is the heat radiating surface of the cooler 24 and which is formed by fins or the like.

Reference numeral 30 denotes a fixing plate stacked on the heat exchanger 25, and fixing bolts 31 penetrating both ends of the fixing plate are screwed into screw holes 32 provided in the heat radiating member 29 to connect the heat exchanger 25, the cooler 24, and the heat radiating member 29. The dehumidifiers 33 are configured so as to be fixed to each other.

In the dehumidification of the measurement gas by the dehumidifier 33 configured as described above, the measurement gas supplied to the gas supply pipe 28 uses the heat exchanger 25.
The water contained in the measurement gas is condensed on the inner surface of the gas supply pipe 28 to be removed while passing through.

{Problems to be solved by the invention} If the dehumidifying effect decreases or the dehumidification becomes impossible while using the conventional dehumidifier, try disassembling the dehumidifier for repair or the like. It was found that the electronic cooling element 21 of the cooler 24 is often short-circuited or broken.

In addition, the silicon grease film 26 interposed between the cooler 24 and the heat exchanger 25 to improve heat exchange may be lost due to drying or the like.

In this way, when the silicon grease film 26 disappears, the cooler
Moisture generated by condensation enters between the heat exchanger 25 and the heat exchanger 25, which corrodes the surface of the heat exchanger 25, which is often formed of aluminum, and is formed due to this corrosion. The small unevenness causes a gap between the cooler 24 and the heat exchanger 25, which causes a problem of poor heat conduction. The silicon grease film 26 between the cooler 24 and the heat exchanger 25 dries and flows out because the surrounding area is open.
It is considered that this is due to the fact that it is easily affected by heat from the heat radiation surface of 24 or the atmosphere.

When the above-mentioned short circuit or breakage of the electronic cooling element 21 was examined, it was found that this was caused by the deterioration of insulation due to the water that entered the cooler 24.

And, as for the water content, when the cooler 24 is operated, the water condensed on the peripheral surface or the like is not supported by the support plates 22a, 22.
The contact surface between b and the sealing wall 23 interposed between them, or the lead wire (not shown) of the electronic cooling element 21 and the sealing wall 23.
Gradually infiltrate from the contact surface with, or support plate
It is considered that the moisture in the atmosphere entered from the contact surface between the sealing wall 23 and the 22a, 22b is condensed.

When moisture or air enters the cooler 24, the sealing wall 23 is provided in a filled state between the support plates 22a and 22b. The silicon rubber forming the sealing wall 23 is a sealing material. The adhesive strength is weak. Therefore, during the initial period when the sealing wall 23 is formed, it is in close contact with the support plates 22a and 22b and prevents the passage of gas and liquid,
As the usage period of the dehumidifier 33 becomes longer, the sealing wall 23 is gradually separated from the support plates 22a, 22b, for example, partially,
It is considered that these are only in contact with each other.

The present invention solves the above problems, prevents water from entering the cooler, eliminates the deterioration of insulation of the electronic cooling element, and is a heat conductive film between the cooler and the heat exchanger. The purpose is to prevent the loss and spillage due to drying.

{Means for Solving the Problems} The present invention has the following means for solving the above problems.

That is, the electronic cooling element is sandwiched by a pair of support plates such as ceramics, and the electronic cooling element is sealed by a sealing wall formed between the two support plates. In a dehumidifier for analysis gas in which a heat exchanger is arranged on a cooling surface, a sealing wall formed between the both support plates is formed by filling and hardening a plastic adhesive between the both support plates, and A heat conductive film is provided between the cooler and the heat exchanger, and the heat conductive film is sealed between the cooler and the heat exchanger with a cured and filled plastic adhesive. Is characterized by.

As the plastic adhesive, one having a strong adhesiveness may be used, and examples thereof include epoxy resin, vinyl acetate resin, and two-component reactive acrylic resin. The heat conductive film is formed of, for example, silicon grease.

[Operation] In this dehumidifier for analysis gas, the sealing wall around the cooler is formed by filling and hardening a plastic adhesive such as an epoxy resin between a pair of support plates. The sealing wall is adhered to each support plate by its adhesive force.

And since these plastic adhesives have a large adhesive force and block liquids and gases, the sealing wall does not peel off from the support plate while the dehumidifier is in use, and the sealing wall is maintained for a long period of time. It is possible to prevent the infiltration of water due to dew condensation and the ingress of air into the inside of the to prevent the moisture from dew condensation on the electronic cooling element.

A heat conductive film is formed between the cooler and the heat exchanger with silicon grease or the like, and the heat conductive film is heat-insulated with the cooler by an enclosure wall formed of a plastic adhesive such as epoxy resin. It is sealed between the exchangers, and the heat of the use of the dehumidifier prevents the heat conductive film from drying.

Moreover, since the enclosure wall is adhered to the cooler and the heat exchanger by its large adhesive force, there is no peeling from them,
This prevents the heat conducting film from drying out for a long period of time.

{Example} An example of the dehumidifier for analytical gas of the present invention will be described with reference to Figs.

In FIGS. 1 and 2, reference numeral 1 denotes an electronic cooling element, which is supported from both sides by support plates 2a, 2b made of an insulating material such as ceramic, and is filled in the entire circumference between the pair of support plates 2a, 2b. Then, the electronic cooling element 1 is attached to the supporting plates 2a, 2b by the sealing wall 3 formed of an epoxy resin adhesive.
The cooler 4 is formed by enclosing it between them.

The sealing wall 3 is formed by filling the adhesive between the supporting plates 2a and 2b, curing the adhesive, and adhering the adhesive to the supporting plates 2a and 2b.

Reference numeral 5 denotes a heat exchanger stacked on the side of the support plate 2a which is the cooling surface of the cooler 4. Between the heat exchanger 5 and the cooler 4, in order to improve heat conduction between them, silicon grease is used. The heat-conducting film 6 made of metal is interposed. 7 is the heat conductive film 6,
A sealing wall (see FIG. 2) formed of an epoxy resin adhesive is provided on the entire circumference of the heat conducting film 6 for sealing between the cooler 4 and the heat exchanger 5. Adhesive is applied over both the cooler 4 and the heat exchanger 5, etc.,
It is formed by curing it, and is adhered to the cooler 4 and the heat exchanger 5 by the adhesive force of the enclosure wall 7 itself.
Reference numeral 8 denotes a gas supply pipe that penetrates through the heat exchanger 5, to which the measurement gas to be dehumidified is supplied.

Reference numeral 9 is a heat radiating member composed of fins arranged on the support plate 2b side which is the heat radiating surface of the cooler 4, and 10 is the heat exchanger 5.
Fixing bolts 11a, 11b penetrating both ends of the fixing plate are stacked on the fixing plate, and screw holes 12a, 1b formed in the heat dissipation member 9
2b is screwed into the heat exchanger 5, the cooler 4, and the heat dissipation member 9
Are fixed to each other to form the dehumidifier 13.

As described above, in the dehumidifier 13, the sealing wall 3 around the support plates 2a, 2b of the cooler 4 is formed of an epoxy resin adhesive having a large adhesive force, so that the support plates 2a, 2b are strongly bonded to each other. It is glued. Therefore, the air is surely prevented from entering the inside of the cooler 4, and even if the humidity of the atmosphere is condensed around the cooler 4 due to the operation of the cooler 4, the water enters the cooler 4. Can be prevented.

Even if the dehumidifier 13 is used for a long period of time, the sealing wall 3 is not partially separated from the support plates 2a, 2b and the atmosphere and water are prevented from entering the cooler 13. Therefore, it is possible to reliably dehumidify the measurement gas for a long period of time without lowering the insulation of the electronic cooling element 1.

Further, the heat conducting film 6 interposed between the cooler 4 and the heat exchanger 5 is also enclosed between the cooler 4 and the heat exchanger 5 by the enclosure wall 7 provided over both the cooler 4 and the heat exchanger 5. Has been done. Moreover, since the enclosing wall 7 is also formed of an epoxy resin adhesive and adheres to the cooler 4 and the heat exchanger 5 by its strong adhesive force, even if the dehumidifier 13 is used for a long period of time. It is possible to prevent the heat conductive film 6 from drying. Therefore, the heat conduction between the cooler 4 and the heat exchanger 5 is
A more efficient state can be maintained for a long period of time, and the measurement gas can be reliably dehumidified.

{Effect of the Invention} As described above, the dehumidifier for analytical gas of the present invention is supported by forming the sealing wall around the supporting plate of the cooler with a plastic adhesive such as epoxy resin having a large adhesive force. Strongly adhered to the plate.

Therefore, it is possible to prevent atmospheric air from entering the inside of the cooler, or water that has adhered to the surroundings due to dew condensation due to the operation of the cooler from entering the cooler. And even if the dehumidifier is used for a long period of time, the sealing wall is adhered to the support plate with its large adhesive force, so that the sealing wall and the support plate do not peel off even partially.
Since it surely prevents the atmosphere and water from entering the cooler,
It is possible to prevent the electronic cooling element from being short-circuited or broken due to deterioration of insulation, and it is possible to extend the life of the cooler and dehumidify the measurement gas for a long period of time.

Further, the enclosing wall enclosing the heat conducting film between the cooler and the heat exchanger is formed of a plastic adhesive such as epoxy resin having a large adhesive force, and is strongly adhered across the cooler and the heat exchanger. .

Therefore, even if the dehumidifier is used for a long period of time, it is possible to prevent the heat conducting film from being lost by being dried or flowing out, and efficiently perform heat conduction between the cooler and the heat exchanger. The measurement gas can be dehumidified.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention, FIG. 1 is a perspective view in which a heat exchanger, a cooler and a heat radiating member are separated, FIG. 2 is a side view in which a sealing wall is crossed, and FIG. It is the side view which crossed the sealing wall which shows an example. 1: Electronic cooling element, 2a, 2b: Support plate, 3: Sealing wall, 4: Cooler, 5: Heat exchanger, 6: Heat conductive film, 7: Encapsulation wall.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area F25B 21/02 B

Claims (1)

[Scope of utility model registration request] 1. A cooler in which an electronic cooling element is sandwiched between a pair of support plates such as ceramics, and the electronic cooling element is sealed by a sealing wall formed between the support plates, on one support plate side of the cooler. In the dehumidifier for analysis gas in which a heat exchanger is arranged on the formed cooling surface, the sealing wall formed between the both support plates is formed by filling and hardening a plastic adhesive between the both support plates, and A heat conducting film is provided between the cooler and the heat exchanger, and the heat conducting film is sealed between the cooler and the heat exchanger with a cured and filled plastic adhesive. A dehumidifier for analysis gas, which is characterized in that