JP4465207B2 - Electronic cooler and analyzer using the same - Google Patents

Description

  The present invention relates to an electronic cooler used for separating condensate in a fluid, for example, removing moisture in a sample gas, and an analysis apparatus using the same.

Conventionally, in air pollution analyzers such as fixed source analyzers, environmental air analyzers, and automobile exhaust gas analyzers, nitrogen oxide (NOx), sulfur dioxide (SO ₂ ), and the like have been measured. Gas analyzers such as a distributed infrared analyzer (NDIR) and a chemiluminescence analyzer (CLD) are used, and an electronic cooler (hereinafter referred to as “cooler”) is often used for the purpose of dehumidification in a sample fluid. ing. In addition, coolers are also widely used in chemical processes, as well as analytical devices for component measurement for various research and field use.

  In recent years, high-sensitivity measurement has become necessary due to sophistication of environmental facilities and strengthening of environmental regulations, and the measurement range has become extremely low, such as 10 to 50 ppm full scale. As sensitivity increases, the influence of coexisting gas interference is also increasing. That is, the interference effect of moisture in the sample gas is increased, and the role of the cooler for condensing and draining the water vapor in the sample gas by cooling and separating and removing from the sample gas is also increasing.

  Specifically, as shown in FIG. 6, a filter, a switching valve, a conduit, a dehumidifier (cooler) for the purpose of dehumidification, dust removal or constant flow in the sample fluid between the sampling point and the analyzer. ), A suction pump, a throttle valve, a flow meter, and the like are provided, and each member is connected by piping to form a sample flow path (see, for example, Non-Patent Document 1).

  As the cooler, for example, one shown in FIG. 7 is known (see, for example, Patent Document 2). That is, in FIG. 7, 1 is a heat exchanging part, which is made of a metal having excellent heat conductivity such as aluminum or copper, and 2 is a thermo module, which is made of, for example, a Peltier element. The heat exchange unit 1 is cooled by being arranged in close contact with the outside. Reference numeral 3 denotes a heat radiating fin which is disposed in close contact with the thermo module 2 and cools the thermo module 2. Reference numeral 4 denotes an outer tube, which is inserted in close contact with the heat exchanging unit 1 in the vertical direction, and cools the sample fluid in the channel formed inside. An inner tube 5 is inserted through the outer tube 4 in the vertical direction to cool the sample fluid in the internal channel. Reference numeral 6 denotes a spiral body (spiral member), which is provided between the inner tube 5 and the outer tube 4 to increase the channel surface area. Reference numeral 7 denotes a branch block (branch member), which is provided with a gas introduction port (fluid introduction path) 8 connected to one of the outer pipes 4 and a gas outlet (fluid delivery path) 9 connected to the inner pipe 5. Yes. A drain block 11 is provided with a drain discharge port (condensate discharge path) 12 connected to the other of the outer pipes 4.

The sample gas reaches the outer tube 4 through the gas inlet 8 and the branch block 7, and descends along the spiral surface of the spiral body 6 in the outer tube 4. At this time, the sample gas is cooled by being subjected to predetermined heat exchange by the heat exchanging unit 1, and the moisture is separated and ascends in the inner pipe 5 as a dehumidified and dried sample gas. The gas is supplied to an analyzer (not shown) through a gas outlet 9. On the other hand, the separated water is discharged as drain through the drain block 11 and the drain discharge port 12.
Japanese Industrial Standard "JIS B7982-2002" JP-A 63-199049

  However, in the above method, depending on conditions such as the flow rate of the sample to be cooled and the moisture content, an excessive burden may be imposed on the cooler, and it may be difficult to maintain a predetermined performance.

  Specifically, for example, in the case of on-site installation in a high temperature atmosphere or when used outdoors in the summer, a sample containing a large amount of moisture is introduced into the cooler. When the water droplets are generated and move to the upper part of the inner tube, the amount of water in the supplied gas may become higher than the amount of water at the time of cooling again. Under more severe conditions, there is a concern that water droplets are mixed in the cooler supply gas.

  In order to reduce the burden on the cooler, it is also effective to reduce the sample temperature or remove water in advance in the previous stage. The device becomes complicated, for example, it is necessary to devise a separate device for the arrangement and the like, and restrictions on the device configuration using the cooler are imposed.

  Furthermore, when the component to be measured is a soluble gas, a part of the gas component may be dissolved in the condensed water to cause a measurement error, and it is necessary to separate and remove particularly quickly.

  In addition, the amount of moisture contained in the coexisting gas component in the fixed generation source or the automobile exhaust gas is 13 to 20 vol%, and the moisture removal performance directly affects the interference influence value, which causes a large measurement error. For example, when the measurement range of the analyzer is low, the amount of moisture interference influence signal may be larger than the concentration signal amount of the measurement component, and the instability of the moisture removal performance is as if the measurement component concentration There is a possibility of giving an error as if. Specifically, when drain or water droplets scatter in the cooling pipe outlet flow path in the cooler, it may cause a sudden abnormal indication (sometimes referred to as an indication sudden change phenomenon).

  Furthermore, even in a CLD that has little moisture effect due to the measurement principle, in high-sensitivity measurement such as component measurement in ambient air, the quenching phenomenon that occurs during chemiluminescence and the decrease in control accuracy of the sample flow rate May interfere with accurate measurement. Therefore, the cooler used for the pretreatment of the gas analyzer is required to have an improved separation and removal performance and a precise dehumidification function in relation to the measurement accuracy of the analyzer.

  In other words, the problem to be solved by the present invention is that efficient gas-liquid separation is possible, the burden on the cooling element is reduced, and a compact electronic cooler is provided, and simple sample processing using this is possible. It is a point to provide a highly accurate analyzer.

  As a result of intensive studies, the present inventors have found that the above object can be achieved by the following electronic cooler and an analyzer using the same, and have completed the present invention.

  The present invention relates to an electronic cooler in which a cooling pipe having a double pipe structure in which an inner pipe is arranged inside an outer pipe is arranged in a heat exchange block in the vertical direction, and the tip of the inner pipe is connected to the cooling pipe. It arrange | positions so that it may be located in the upper part only predetermined distance from the coldest site | part of this. From the mechanism of condensate generation in the cooler internal flow path, the inventor has the greatest influence on the cooler deliverable (gas) in the state of the inner tube that becomes the flow path of the finally processed sample, It has been found that the double pipe structure as in the present invention can efficiently prevent the generation of condensate inside the inner pipe.

That is, in an electronic cooler using a cooling element having a double pipe structure in which an inner pipe is arranged inside the outer pipe and a heat exchange block, and between the inner pipe and the outer pipe. A spiral member is disposed in the flow path formed in the pipe, and the cooling pipe causes the sample gas to descend along the spiral surface of the spiral member and cool by the cooling element via the heat exchange block. The condensed water generated is separated after reaching the tip of the inner tube (hereinafter referred to as “tip Q”), and the sample gas is led up inside the inner tube and led out. the tip Q, the most low temperature and becomes the site (hereinafter referred to as "site P".) than a predetermined distance top in the sample flow path, so as to be located to the vicinity of the site to be coolest at the top Symbol sample gas stop In the above heat exchange block By providing the temperature sensor in the vicinity of the position P, the Cooling element that near the temperature sensor when the sample gas introduction is configured to a predetermined temperature, the sample is most generated through the tip Q The condensate temperature is in contact with the part P having a large heat capacity. At this time, the condensation in the sample is completed at the site P, and then the sample temperature when passing through the inner tube is higher than that, and no condensate is generated. Therefore, the separation of the gas and liquid is completed in the vicinity of the tip portion Q, the generation of condensate inside the inner tube is prevented, and efficient gas and liquid separation becomes possible. Therefore, by applying such a configuration, efficient gas-liquid separation is possible, and the burden on the cooling element can be reduced and a compact electronic cooler can be provided.

  In the cooler described above, it is preferable that at least the inner surface of the inner tube has water repellency. The present inventor found that the presence of condensate inside the inner pipe may cause water droplets from the outer surface of the inner pipe or the flow path together with the generation of condensate inside, especially when a hydrophilic inner pipe is used. It has been found that the influence of the internal wrap around the tube surface in the wet state is great and that the inner surface of the tip has water repellency to prevent it. . Furthermore, even if condensate is generated inside the inner pipe, the water repellent member has the effect of extremely reducing the influence on the cooler deliverable due to the instantaneous drop of water droplets on the inner pipe wall. Obtained knowledge. In either case, the phenomenon on the inner surface of the tip Q has a particularly great effect, and it was very effective to perform water repellent treatment at least on this part. Therefore, by such simple means, it is possible to prevent the condensate from being mixed into the inner tube, and to perform efficient gas-liquid separation, thereby providing a compact cooler.

  Furthermore, in the cooler described above, it is preferable that a spiral member having high thermal conductivity and hydrophilicity is disposed in a flow path formed between the inner tube and the outer tube. With such a structure, the contact time with the tube wall in a predetermined volume space can be increased, and the centrifugal separation function can prevent the splashing of water droplets and prevent the splashes from being mixed into the inner tube flow path. A compact electronic cooler capable of good gas-liquid separation can be provided. In particular, by combining with the water repellent member as described above, more efficient gas-liquid separation becomes possible.

  In the cooler described above, the tip of the inner tube has an opening surface larger than the vertical cross section of the inner tube. By making the flow rate of the sample when moving from the outer surface of the inner tube into the inner tube smaller than the flow rate inside the inner tube, it is possible to prevent the splash from entering the inner tube flow path, Therefore, it is possible to provide a compact electronic cooler capable of good gas-liquid separation. In particular, the combination of the double pipe structure and the water repellent member as described above enables more efficient gas-liquid separation.

  Further, the cooler is characterized in that the inner tube is structured to be fixed to and removable from the outer tube, and the position of the distal end portion of the inner tube relative to the outer tube can be changed. Condensate generation varies with the condensate content in the sample introduced into the cooler. Therefore, in order to effectively gas-liquid separate a sample containing condensate and obtain stable cooler characteristics, the position of the tip Q is adjusted according to the condensate content in the sample, and the optimum temperature distribution is obtained. It is preferable to control. By adopting a structure in which the position of the inner tube relative to the outer tube can be changed as in the present invention, it is possible to supply a cooler that can quickly respond to changes in the measurement target and changes in sample conditions. In addition, it is possible to check the state of condensate generation in the state of actual operation at the site, and it is possible to inspect and maintain the inside of the cooler at the site, which was impossible before. A cooler can be provided.

  The present invention is suitable for an analyzer using any one of the above-described electronic coolers in a sample processing section. Since such a cooler has an excellent gas-liquid separation function and can perform efficient cooling and dehumidification, it can be used as a dehumidifier in a sample collection part of an analyzer to enable simple sample processing. It is effective to provide a highly accurate analyzer. Specifically, when dehumidifying a sample containing a water-soluble component, it is possible to perform an efficient cooling and dehumidifying process without providing a special member before or after the cooler. Can be reduced.

  As described above, according to the present invention, in the removal of the condensate in the sample, the optimum position of the member and the surface characteristics of the member are set based on the flow of the fluid or the temperature distribution in the cooler. There is an advantage that good gas-liquid separation can be made possible. Therefore, the structure of the present invention can reduce the burden on the cooling element and provide a compact electronic cooler.

  In addition, by using it as a dehumidifier in the sample processing section of the analyzer, it is possible to perform efficient cooling and dehumidification without any special processing, providing a compact and highly accurate analyzer with high energy efficiency. can do.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking as an example the treatment of a sample gas containing moisture.

  FIG. 1 is a basic configuration diagram of an electronic cooler showing an example of the present invention. 1B, the cooling element 2 including the thermo module cools the heat exchange block 1 by bringing the cooling surface into contact with the heat exchange block 1 and also radiates heat by bringing the heat radiation surface into contact with the fins 3. In FIG. 1A, the sample gas is supplied to the flow path provided in the heat exchange block 1 and cooled in the outer tube 4 and the inner tube 5, and the moisture in the sample is condensed and condensed. Water is discharged separately as drain. The heat exchanging block 1 is provided with a temperature sensor 10 and controlled so as to have a desired cooling temperature by the endothermic action of the cooling element 1 and is formed around the heat exchanging block 1 and the outer tube 4 by a foam material or the like. A heat insulating member (not shown) is provided to maintain the cooling temperature.

  Specifically, the sample gas reaches the outer tube 4 through the sample introduction path 8 and the branch member 7, and descends along the spiral surface of the spiral member 6 inside the outer tube 4 (outside the inner tube). At this time, the sample gas is cooled by being subjected to a predetermined heat exchange by the heat exchange unit 1 to generate condensed water, and after reaching the inner tube tip Q together with the condensed water, the drain is separated and dehumidified and dried. As the sample gas, the inside of the inner pipe 5 is raised and supplied to the analyzer (not shown) through the branch member 7 and the gas supply path 9. On the other hand, the separated condensed water is discharged as drain through a condensate discharge path (not shown).

  In the cooler according to the present invention, as shown in FIG. 1 (A), the inner tube 5 is arranged such that the tip Q of the inner tube 5 is located a predetermined distance above the coldest portion P in the sample flow path. It is characterized by arranging. That is, by positioning the tip Q at a predetermined distance above the coldest part P of the sample flow path, the sample passing through the tip Q comes close to the part P and rises back, leaving the part P. Become. At this time, since the part P is the coldest part, there is much generation of condensed water, forming a low temperature containing splashed water and a large heat capacity (endothermic effect). Therefore, the condensation in the sample is completed at the site P, and the temperature of the sample gas that subsequently rises inside the inner tube never falls below that, and no condensate is generated in the rising gas.

In other words, since the sensible heat of the gaseous sample is small and the latent heat of the condensed water is large, the sample in the vicinity of the part P is in contact with the space having the lowest temperature and the large endothermic effect. It will be dehumidified. In addition, while the sample is folded and raised at the tip Q, the condensed water falls without folding due to the downward inertia and its own weight, so that the sample can be separated while avoiding direct contact with the condensed water. . Therefore, a sample in which no splash is mixed and no condensed water is generated inside the inner tube 5 can be delivered from the cooler.

  Moreover, the temperature distribution at each point of the cooler flow path (outer tube 4) is schematically shown in FIG. The case where the sample gas is not introduced is represented by a thin line in the graph in the drawing, and the case where the predetermined flow rate is introduced is represented by a thick line in the graph in the drawing. When the gas is stopped, the center P ′ of the heat exchange block 1 is the most cooled part, and when the gas is introduced, it indicates that there is the most cooled part P downstream from the center P ′ of the heat exchange block 1. ing. That is, in the actual cooler, it is preferable to arrange the inner tube so that the tip end portion Q is disposed substantially at the center P ′ of the heat exchange block 1.

  Specifically, for example, when the inner tube 5 of φ8 / φ6 is inserted into the outer tube 4 of φ14 / φ12, or when the inner tube 5 of φ6 / φ4 is inserted into the outer tube 4 of φ10 / φ8, In the case of introducing a sample of about 0.5 L / min, it has been obtained that it is preferable to dispose the tip portion Q about 5 to 10 mm above the site P.

  In the cooler described above, it is preferable that the tip end portion Q is formed of a water-repellent member (second configuration example). Specifically, as shown in FIG. 3A, a water repellent treatment such as applying or fixing a water repellent member 5a to the tip portion Q of the inner tube 5 or a method shown in FIG. As described above, a method of inserting the water-repellent tube material 5b into the inner tube is exemplified. Here, by providing the water repellent portion only at the tip portion Q, the object of the present invention can be sufficiently achieved, but it is also possible to form the entire inner tube with a water repellent material. Furthermore, it is possible to form the inner tube from a hydrophilic material so that part or all of the surface inside the inner tube has water repellency. Examples of the water repellent member include fluorine-based materials such as tetrafluoroethylene and fluororesin.

  That is, when the tip Q and the inside of the inner tube have water repellency, one can prevent the condensate from flowing into the inner tube caused by the wet state of the surface of the inner tube 5, Moreover, generation | occurrence | production of the condensate inside the inner pipe 5 can be prevented. Furthermore, even if condensate is generated inside the inner pipe, it is possible to effectively prevent the splashing of the sample from being mixed by the instantaneous drop of water droplets on the inner pipe wall by the water repellent member. As described above, in the present invention, it is possible to prevent the condensate from being mixed into the inner tube and to perform efficient gas-liquid separation by a simple means, thereby providing a compact cooler.

  Furthermore, in the above cooler, as shown in FIG. 1 or FIG. 3, a spiral member having high thermal conductivity and hydrophilicity is disposed in the flow path formed between the inner tube and the outer tube. Is preferred. The spiral member 6 can obtain the effect of increasing the contact time with the tube wall in the space of the same volume, and can obtain the effect of improving the efficiency of gas-liquid separation from the centrifugal separation effect in the direction of the outer tube 4. Further, by using a material having high thermal conductivity for the spiral member 6, the cold heat of the outer tube 4 can be efficiently transmitted to the introduced gas, and the gas cooling effect can be enhanced. Furthermore, by forming the spiral member 6 with a hydrophilic material, it is possible to promote the generation of water droplets and the separation of gas and liquid.

  In the present invention, these can be combined with the above-described arrangement effect of the inner pipe 5 to prevent water droplets from scattering and effectively prevent the splashes from being mixed into the inner pipe internal flow path. A compact electronic cooler capable of gas-liquid separation can be provided.

  At this time, regarding the material of the members constituting the flow path, the outer tube 4 and the spiral member 6 are made of carbon, graphite, or resin such as vinyl chloride, metal such as stainless steel or titanium, etc., and have high thermal conductivity and corrosion resistance. It is preferable to use a material having a property. For the inner tube 5, it is preferable to use the same material as the outer tube 4 in the case of water repellent treatment or insertion of a water repellent member. However, as described above, the water repellent material tube is used as it is as the inner tube 5. It is also possible to use it.

  As an example, Table 1 shows the results of confirming the quality of the gas-liquid separation state by the combination of the inner tube 5 and the spiral member 6 with an actual machine.

スパイラル部材６を親水性である塩化ビニルあるいはチタンとし、内管５を撥水性のフッ素樹脂としたときが、好適に気液分離され、特にスパイラル部材６を熱伝導性の高いチタンとする方が好ましいとの結果を得た。

When the spiral member 6 is made of hydrophilic vinyl chloride or titanium and the inner tube 5 is made of a water-repellent fluororesin, gas-liquid separation is preferably performed, and in particular, the spiral member 6 is made of titanium having high thermal conductivity. The result was preferable.

  A third configuration of the present invention is illustrated in FIG. The inner tube tip Q has an opening surface larger than the inner tube vertical section R. In general, when gas-liquid separation of a moving gas-liquid mixture is performed, the flow velocity and gravity are greatly affected, and it is considered that the lower the flow velocity and the direction in which gravity is applied (falling direction), the higher the gas-liquid separation efficiency. The same applies to the movement of the tubular object from the outside to the inside. The flow rate of the sample when moving from the outer periphery of the inner tube to the inside of the inner tube is made smaller than the flow rate inside the inner tube, thereby Mixing into the inner pipe internal flow path can be prevented, and efficient gas-liquid separation becomes possible.

  Specifically, for example, as shown in FIG. 4 (A), when the distal end portion Qa of the inner tube 5 has a shape having an expanded portion larger than the inner tube vertical section R, when passing through the distal end portion Qa. As a result, the sample flow rate decreases, and gas-liquid separation is promoted. At this time, the water drop falls due to the downward inertia and its own weight due to the downward flow of the gas, and the cross-sectional area of the inner tube 5 and the outer tube 4 near the tip Qa becomes narrow, and the water drop falls. This accelerates the gas-liquid separation. At the same time, it is advantageous in that the processing is facilitated by expanding the pipe such as when the spiral member 6 is arranged or when the inner pipe is assembled.

  Further, the tip portion Qb of the inner tube 5 or the water repellent member 5b can be formed into a shape having an inclination angle r as shown in FIG. The sample flow rate when passing through the tip Qb is lowered, and gas-liquid separation is promoted. At the same time, the water droplets are promoted to fall due to the downward inertia and dead weight due to the downward flow of gas, and gas-liquid separation is promoted.

  Such a structure enables gas-liquid separation more efficiently by combining with the water repellent member as described above. Further, the centrifugal separation effect by the spiral member 6 further promotes the effect of preventing the splash of the gas introduced into the inner tube 5 from being mixed. Thus, an electronic cooler that can perform efficient gas-liquid separation and has a small burden on the cooling element can be provided by a very simple and compact configuration.

  Furthermore, in the above cooler, the inner tube can be fixed to and inserted into and removed from the outer tube, and the position of the tip of the inner tube relative to the outer tube can be changed. The condensate content in the sample may vary greatly depending on the properties of the sample, and may vary with the season or the object to be measured, as well as changes in the operating location. In such a case, in order to stabilize the characteristics of the cooler, it is preferable that the characteristics of the cooler can be adjusted according to the condensate content in the sample. In the present invention, in addition to the above-described configuration, the inner tube has a structure in which the positional relationship with respect to the outer tube can be changed, so that the optimum temperature distribution is controlled and the sample containing the condensate is effectively gas-liquid separated. However, it is possible to supply a cooler that can quickly respond to changes in sample conditions.

  In addition, this configuration makes it possible to remove the inner pipe while it is operating at the site and check the inside / outside of the pipe, that is, the state of condensate generation during actual operation. This provides the advantage that inspection and maintenance can be performed.

  The present invention is suitable for an analyzer using any one of the above-described electronic coolers in a sample processing section. Since such a cooler has an excellent gas-liquid separation function and can perform efficient cooling and dehumidification, it can be used as a dehumidifier in a sample collection part of an analyzer to enable simple sample processing. It is effective to provide a highly accurate analyzer. That is, the dehumidification in the analyzer is often aimed at reducing the influence on the measured value of moisture (for example, the influence of moisture interference) and preventing corrosion due to condensation or splashing in the apparatus flow path. A cooler having an excellent gas-liquid separation function and having a stable cooling action is preferable.

  Specifically, for example, in the analyzer having the configuration shown in FIG. 6 described above, even if it is necessary to dehumidify a sample containing a large amount of water, it is specially provided in the front stage or the rear stage of the cooler. Since efficient cooling and dehumidification processing can be performed without the need for additional components, it is possible to reduce channel error due to measurement errors and splashes, simplifying the entire system and reducing costs. Can be tied to

  FIG. 5 illustrates characteristics of the cooler in the present invention. Specifically, under the following test conditions, the improved and conventional coolers were compared, and the results of tracking the moisture concentration (dew point display) changes in the cooler outlet gas for both times were shown. Yes.

<Test conditions>
(1) As a test product improvement type, a spiral member having an inner tube optimally arranged, a water-repellent material at the tip, and a high thermal conductivity and hydrophilicity in a flow path formed between the inner tube and the outer tube And a cooler according to the present invention in which the tip of the inner tube has a large opening surface.
(2) Supply gas A sample containing a water content saturated at 25 ° C. was introduced into the cooler at 0.5 L / min.
(3) Characteristic confirmation The dew point meter was connected to the outlet gas flow path, and the moisture in the outlet gas was measured.

<Test results>
As shown in FIG. 5, the dew point change of maximum 1.2 ° C. was observed in the conventional type, but the dew point change of maximum 0.2 ° C. was observed in the improved type, which was greatly improved.

  This result corresponds to, for example, a change in the interference effect equivalent to a maximum of about 10 ppm NO in the conventional type in the analyzer using NDIR, and a change in the interference effect equivalent to a maximum of about 1 ppm NO in the improved product. . In the case of NDIR, the influence of interference on moisture can be further improved by using an interference compensation detector.

  Thus, by using the cooler according to the present invention, abnormalities and errors in measured values due to instability of the moisture removal performance of the cooler, which corresponds to 5 to 20% of the measurement range in conventional low concentration measurement, can be obtained. This eliminates the problem and makes the analyzer highly reliable even in the long term.

  Although the above description has been mainly focused on samples containing moisture, the same technique is very effective in, for example, separation of a sample of a mixture containing hydrocarbons such as butane, pentane, and hexane, and is limited to the above. It goes without saying that it is not a thing.

  In the above description, the case of a cooler having a single flow path has been described as an example. However, the present invention can also be applied to a cooler having a plurality of flow paths and an analyzer using the cooler.

Explanatory drawing which shows the 1st structural example of the electronic cooler which concerns on this invention. Explanatory drawing which illustrates temperature distribution of a channel concerning the present invention Explanatory drawing which shows the 2nd structural example of the electronic cooler which concerns on this invention. Explanatory drawing which shows the 3rd structural example of the electronic cooler which concerns on this invention. Explanatory drawing illustrating characteristics of the electronic cooler according to the present invention Explanatory drawing which shows the example of a structure of the analyzer which concerns on a prior art Explanatory drawing which shows the structural example of the electronic cooler which concerns on a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchange block 2 Cooling element 3 Fin 4 Outer tube 5 Inner tube 6 Spiral member 7 Branch member 8 Sample introduction path 9 Sample supply path 10 Temperature sensor

Claims (6)

In an electronic cooler using a cooling element in contact with the heat exchange block, a cooling pipe having a double pipe structure in which an inner pipe is arranged inside the outer pipe is arranged vertically in the heat exchange block .
While arranging a spiral member in the flow path formed between the inner tube and the outer tube,
The cooling pipe causes the condensed gas generated when the sample gas descends along the spiral surface of the spiral member and is cooled by the cooling element via the heat exchange block to the tip of the inner pipe. Separated after reaching, the sample gas is configured to be led out inside the inner tube,
The distal end portion of the inner tube, an only the upper predetermined distance from the coldest to become site at the sample gas introduction in the sample flow path, arranged to be located to near sites of greatest cold before SL when the sample gas stop And
In the heat exchanger block, by providing a temperature sensor in the vicinity of the coldest become sites at the sample gas introduction in the sample flow path, the temperature around the sensor when the cooling element by Ri before Symbol sample gas introduced into a predetermined It is comprised so that it may become the temperature of. The electronic cooler characterized by the above-mentioned. 2. The electronic cooler according to claim 1, wherein at least an inner surface of a tip portion of the inner tube has water repellency. 3. The electronic cooler according to claim 1, wherein a spiral member having high thermal conductivity and hydrophilicity is disposed in a flow path formed between the inner tube and the outer tube. The electronic cooler according to any one of claims 1 to 3, wherein a tip portion of the inner tube has an opening surface larger than a vertical cross section of the inner tube. 5. The structure according to claim 1, wherein the inner tube has a structure that can be fixed to and inserted into and removed from the outer tube, and the position of the distal end portion of the inner tube with respect to the outer tube can be changed. Electronic cooler. 6. An analyzer using the electronic cooler according to claim 1 in a sample processing section.

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