JP6796779B2 - Psyrometer - Google Patents

Description

The present invention relates to a psychrometer.

Generally, as a device for observing weather and measuring the temperature and humidity of a space, a wet-bulb thermometer and a psychrometer provided inside a measuring container are ventilated with a gas to be measured to measure the temperature. Ventilation psychrometers are known (see, for example, Patent Document 1).

FIG. 1 is a psychrometer for measuring the temperature and humidity of the environment described in Patent Document 1.

As shown in FIG. 1, the psychrometer of Patent Document 1 has a casing 91, a ventilation passage 92 having an air inlet and an air outlet provided in the casing 91, and a measurement environment provided inside the ventilation passage 92. A measuring unit 93 for measuring the dry-bulb temperature and the wet-bulb temperature, a blower fan 94 provided downstream of the measuring unit 93 and generating a predetermined amount of air in the ventilation passage 92, and a blower fan 94 provided downstream of the blower fan 94. It is composed of an electronic device 95 that processes an electric signal of the measuring unit 93.

Japanese Unexamined Patent Publication No. 2004-301805

In the psychrometer described in Patent Document 1, the gas to be measured is made to flow into the ventilation passage 92 provided in the casing 91 by the air blown by the blower fan 94, and the gas to be measured is applied to the measurement unit 93 to hit the measurement unit 93. At 93, the dry-bulb temperature and the wet-bulb temperature are detected. The measuring unit 93 transmits the detected dry-bulb temperature and wet-bulb temperature to the electronic device 95 as an electric signal, whereby the dry-bulb temperature, the wet-bulb temperature, or the humidity is calculated.

However, with the psychrometer described in Patent Document 1, it is difficult to perform highly accurate measurement in an environment containing fine mist in the outside air to be measured, such as in the vicinity of a waterfall basin or in an early morning forest.

Specifically, the gas to be measured including the fine mist guided into the ventilation passage 92 of the casing 91 by the blower fan 94 passes through the measurement unit 93 and is discharged from the outlet of the ventilation passage 92. At this time, fine mist adheres to the measuring unit 93, but the adhered mist evaporates, which causes a problem of lowering the temperature measured by the measuring unit 93 by heat of vaporization cooling. As described above, the psychrometer according to the prior art has a problem that the dry-bulb temperature and humidity to be measured cannot be measured accurately.

The present invention has been made in view of the above-mentioned problems, and provides a psychrometer capable of measuring the dry-bulb temperature of a gas with high accuracy even if the gas to be measured contains fine mist. The purpose is.

In the present invention that solves the above-mentioned conventional problems, a measuring unit for measuring the dry bulb temperature, a tubular measuring container for accommodating the measuring unit in the accommodating space, one end is open to the outside air, and the other end is accommodating. A psychrometer including a suction pipe arranged in a space in a direction eccentric from the central axis of the accommodation space.

According to the psychrometer according to the present invention, the dry-bulb temperature of a gas can be measured with high accuracy without being affected by the fine mist in the air.

Schematic diagram showing a schematic configuration of a psychrometer according to the prior art Schematic diagram showing a schematic configuration of a psychrometer according to the first embodiment of the present invention. Sectional drawing which shows the schematic structure of the psychrometer which concerns on 1st Embodiment of this invention. Schematic diagram showing a schematic configuration of a psychrometer according to a second embodiment of the present invention. Sectional drawing which shows the schematic structure of the psychrometer which concerns on 2nd Embodiment of this invention. Side view showing an example of the shape of the slit according to the second embodiment of the present invention. Top view showing an example of the shape of the slit according to the 2nd Embodiment of this invention. Schematic diagram showing a schematic configuration of a psychrometer according to a third embodiment of the present invention. Sectional drawing which shows the schematic structure of the psychrometer which concerns on 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First Embodiment)
FIG. 2 is a schematic view showing a schematic configuration of a psychrometer according to the first embodiment of the present invention. Further, FIG. 3 is a cross-sectional view of a schematic configuration of the psychrometer according to the first embodiment of the present invention. The arrows shown in FIG. 3 represent the flow of outside air sucked from the space to be measured.

The psychrometer according to the present embodiment is, for example, a ventilation psychrometer. This wet and dry meter accommodates a measuring unit 1, a substantially cylindrical inner tube 2 accommodating the measuring unit 1, a substantially cylindrical measuring container 3 covering the upper surface and the outer surface of the inner tube 2, and a measuring container 3. A substantially cylindrical outer container 4 having a discharge port 4a on the upper surface, a suction pipe 5 inserted into the outer surface of the measuring container 3 eccentrically with respect to the central axis of the measuring container 3 and penetrating the outer container 4, and an outer container 4 It is provided with a blower motor 6 connected to the discharge port 4a of the above. Here, the central axes of the inner tube 2, the measuring container 3, and the outer container 4 on the substantially cylindrical shape are substantially the same.

The details of each configuration will be described below.

The measuring unit 1 is a sensor that measures the dry-bulb temperature. The measuring unit 1 measures the dry-bulb temperature of the outside air that is surrounded by the inner tube 2 and flows in through the suction port 2a formed on the upper surface of the inner tube 2. As the measuring unit 1, for example, a thermocouple, a mercury thermometer, or the like is used.

The measuring container 3 is a substantially cylindrical container that houses the inner tube 2 and the measuring unit 1. The measuring container 3 forms a substantially columnar storage space extending in the vertical direction by the inner surface. The storage space of the measuring container 3 is substantially sealed.

A suction pipe 5 is inserted from the outer surface into the accommodation space of the measuring container 3, and outside air is introduced through the suction pipe 5. Further, a suction port 2a is provided at the upper end of the inner pipe 2, and the outside air introduced through the suction pipe 5 is sucked from the suction port 2a by the suction force of the blower motor 6. In other words, the inside of the inner pipe 2 is in a state of being negatively pressured with respect to the outside air by the suction force of the blower motor 6. Here, the suction port 2a is arranged so as to be located above the position where the suction pipe 5 is inserted.

The suction pipe 5 is inserted from the outer surface of the measurement container 3 and introduces the outside air of the space to be measured into the accommodation space of the measurement container 3. One end of the suction pipe 5 is arranged outside the outer container 4, and the other end is arranged at a position eccentric from the central axis in the accommodation space of the measuring container 3.

More specifically, the other end of the suction pipe 5 is a circular shape having a central axis of the measurement container 3 (a cross section perpendicular to the longitudinal direction of the storage space) in a substantially columnar storage space formed by the inner surface of the measurement container 3. It is arranged in the direction of eccentricity from the center). As a result, the outside air flowing out from the other end of the suction pipe 5 spirally flows along the inner surface of the measuring container 3.

The inner pipe 2 is a tubular member that accommodates the measuring unit 1 and introduces the outside air separated by the mist into the measuring unit 1. The inner tube 2 is arranged on the central axis of the accommodation space of the measuring container 3 so that the direction of the central axis is the vertical direction.

One end on the upper side of the inner tube 2 constitutes a suction port 2a, is arranged in the accommodation space of the measurement container 3, and sucks outside air from the accommodation space of the measurement container 3. The other end on the lower side of the inner pipe 2 constitutes a discharge port 2b, and discharges the outside air sucked from the suction port 2a. In the discharge port 2b, the outer container 4 is arranged on the lower side of the storage space for accommodating the measurement container 3, and the suction force of the blower motor 6 directs the outside air sucked from the suction port 2a toward the discharge port 4a of the outer container 4. And distribute it. In this way, the outside air is introduced into the measuring unit 1 arranged inside the inner pipe 2.

The outer container 4 is an outer container that surrounds the outer surface of the measuring container 3 and stabilizes the temperature state of the measuring container 3. Here, the outer container 4 surrounds the entire outer surface of the measuring container 3 so that the measuring container 3 does not come into contact with the outside air containing mist, and the measuring container 3 is housed in the storage space. Further, in order to improve the heat insulating property, the outer container 4 houses the measuring container 3 so that the inner surface of the outer container 4 and the outer surface of the measuring container 3 do not come into contact with each other.

As a result, the inside of the measuring container 3 is insulated by the measuring container 3 itself and the gas in the outer container 4, and the gas in the outer container 4 is continuously discharged, so that the amount of solar radiation The structure is such that it is not easily affected by changes in the amount of heat from the outside of the outer container 4 due to changes or the like.

The outer container 4 has a discharge port 4a connected to the blower motor 6 at the upper portion, and discharges the outside air in the accommodation space of the measurement container 3 by utilizing the suction force of the blower motor 6.

The blower motor 6 is a suction pump connected to the discharge port 4a of the outer container 4 to suck the outside air into the accommodation space of the measurement container 3 and discharge the outside air in the accommodation space of the measurement container 3 from the outer container 4. ..

The sensor for measuring the wet-bulb temperature may be built in the psychrometer (for example, FIGS. 8 and 9), or may be provided outside the psychrometer. In addition, it goes without saying that arithmetic processing such as relative humidity may be performed from these measurement results.

The operation and operation of the psychrometer configured as described above will be described below. First, the mist separation action of the psychrometer according to the present embodiment will be described.

The inside of the accommodation space of the measuring container 3 is in a state of negative pressure with respect to the atmosphere by the blower motor 6. Therefore, the outside air flows into the accommodation space from the space to be measured via the suction pipe 5 (hereinafter, the inflowing outside air is referred to as "suction gas").

Here, the suction pipe 5 is arranged eccentrically from the central axis of the accommodation space of the tubular measuring container 3. Therefore, the suction gas spirally rises in the accommodation space of the measurement container 3 and flows into the suction port 2a of the inner tube 2. At this time, the inflowing mist collides with the inner surface of the measuring container 3 due to centrifugal force to form water droplets and is separated from the gas. That is, the suction gas becomes a gas in which the mist is separated and flows into the suction port 2a of the inner pipe 2. The water droplets separated from the gas will fall on the bottom surface of the measuring container 3.

On the other hand, the gas that has passed through the inner tube 2 is exhausted from the lower part of the inner tube 2 after passing through the measuring unit 1, passes through a flow path formed from the inner surface of the outer container 4 and the outer surface of the measuring container 3, and passes through the outer container. Exhaust from the upper part of 4.

By separating the mist from the sucked gas in this way, the measuring unit 1 can accurately measure the dry-bulb temperature of the outside air.

Next, the temperature stabilizing action of the psychrometer according to the present embodiment will be described.

The suction gas exchanges heat with the members constituting the measuring container 3 and the inner tube 2. For example, the suction gas exchanges heat with the gas in the inner tube 2 through the side surface of the inner tube 2 and with the gas in the outer container 4 through the side surface of the measuring container 3. Therefore, when there is a temperature difference between the temperature of the measuring container 3 or the inner tube 2 and the temperature of the suction gas, the measuring unit until the temperature of the measuring container 3 or the inner tube 2 becomes the same as that of the suction gas. In 1, the temperature different from the temperature of the gas to be measured is measured. Then, even if the temperatures of the measuring container 3 and the inner tube 2 are different from the temperature of the suction gas, the gas is continuously sent from the suction port 2a, so that the temperatures of the measuring container 3 and the inner tube 2 are raised. Adjust to the temperature of the inhaled gas. In other words, the measuring unit 1 cannot accurately measure the temperature of the suction gas until the temperatures of the measuring container 3 and the inner tube 2 become substantially equal to the temperature of the suction gas.

In this respect, the wet and dry meter according to the present embodiment introduces the suction gas into the space between the inner tube 2 and the measuring container 3, and then introduces the suction gas into the inner tube 2, thereby introducing the suction gas into the inner tube 2. , And the temperature of the measuring container 3 can be brought close to the temperature of the suction gas quickly.

Further, this psychrometer has a configuration in which the outer surface of the measuring container 3 is surrounded by the outer container 4 to prevent the measuring container 3 from coming into contact with the outside air containing fine mist. This makes it possible to prevent the temperature state of the measuring container 3 from becoming unstable due to the heat of vaporization cooling of the fine mist.

In addition, since the negative pressure state is maintained between the inner surface of the outer container 4 and the outer surface of the measuring container 3 by the suction of the blower motor 6, the inner surface of the outer container 4 and the outer surface of the measuring container 3 are in a heat insulating state. It becomes a state close to. Therefore, it is possible to suppress the influence of the temperature change of the outer container 4 on the measuring container 3.

As described above, in the psychrometer according to the present embodiment, the temperature states of the inner tube 2 and the measuring container 3 can be stabilized at an early stage. As a result, the measuring unit 1 can accurately measure the dry-bulb temperature of the outside air.

More preferably, each part of the psychrometer according to the present embodiment has the following configuration.

For the measuring container 3, it is desirable to use a material having a small specific heat such as aluminum or copper and having high thermal conductivity, and to make the wall surface thickness as thin as possible. Further, the joint between the upper and lower surface members and the side surface members in the measuring container 3 shall be manufactured by welding without using parts such as screws so that the mass of the measuring container 3, that is, the heat capacity of the measuring container 3 is reduced. Is desirable.

As a result, the temperature of the measuring container 3 quickly approaches the temperature of the suction gas. As a result, the time until the temperature measured by the measuring unit 1 stabilizes is shortened, and it can be used for outdoor measurement where environmental fluctuations are severe and for experiments in which a sudden temperature difference occurs.

Further, regarding the inner surface of the measuring container 3, it is desirable that the shape of the cross section perpendicular to the longitudinal direction of the measuring container 3 is substantially circular. As a result, the gas containing the fine mist flowing in from the suction pipe 5 draws a spiral along the inner surface of the measuring container 3 and flows to the upper part of the measuring container 3, so that the effect of separating the fine mist by centrifugal force is increased. Can be done.

Further, it is desirable to attach thin-walled fins having a small heat capacity to the outer surface of the measuring container 3. As a result, the heat transfer area in the ventilation flow path formed between the inner surface of the outer container 4 and the outer surface of the measuring container 3 increases, and the temperature of the measuring container 3 approaches the temperature of the suction gas faster. In other words, the time until the temperature measured by the measuring unit 1 stabilizes is shortened, and it can be used for outdoor measurement in which environmental fluctuations are severe and for experiments in which a sudden temperature difference occurs.

Further, it is desirable to provide a heat insulating member on the inner surface of the outer container 4. As a result, it is possible to suppress the influence of the temperature change of the outer container 4 on the measuring container 3, and it is possible to shorten the time until the temperature measured by the measuring unit 1 stabilizes.

As described above, according to the psychrometer according to the present embodiment, it is possible to measure the dry-bulb temperature with high accuracy even in an environment containing mist in the outside air.

Further, according to the psychrometer according to the present embodiment, it is possible to prevent mist from adhering to the measuring container 3 and accurately measure the dry-bulb temperature without being affected by the heat of vaporization cooling by the adhering mist. Further, even when the change in the amount of heat from the outside of the outer container 4 due to the change in the amount of solar radiation is large, the dry-bulb temperature can be accurately measured by suppressing the change in the amount of heat around the dry-bulb thermometer. Further, even when a large amount of mist is contained, the dry-bulb temperature can be accurately measured by preventing the heat of vaporization cooling by the mist separated from the gas.

(Second Embodiment)
Next, the psychrometer according to the second embodiment will be described with reference to FIGS. 4 to 7.

FIG. 4 is a schematic diagram showing a schematic configuration of the psychrometer according to the second embodiment. Further, FIG. 5 is a cross-sectional view of a schematic configuration of the psychrometer according to the second embodiment. The arrow indicated by the broken line in FIG. 5 represents the flow of water droplets for removing the mist separated from the sucked gas from the accommodation space of the measuring container 3.

The psychrometer according to the first embodiment is different from the psychrometer according to the first embodiment in that it includes a drain tank 7, a slit 8, and a drain pipe 9. The configuration common to the first embodiment will be omitted from the description (hereinafter, the same applies to the other embodiments).

The slit 8 is an opening provided so as to penetrate the side surface of the measuring container 3. The slit 8 is formed so as to extend in the vertical direction from the bottom surface of the measuring container 3.

6A and 6B are side views showing an example of the shape of the slit 8. 7A and 7B are views of a cut surface cut along the cross section AA of FIG. 5, and is a plan view of the shape of the slit 8. A more desirable aspect of the shape of the slit 8 will be described later with reference to these figures.

The drain pipe 9 is a pipe in which one end is connected to the slit 8 and the other end is connected to the drain tank 7, and the water droplets flowing into the slit 8 are discharged to the drain tank 7.

The drainage tank 7 is a container for storing water droplets removed from the storage space of the measurement container 3. The drainage tank 7 has a tank suction port 7a, and transmits the suction force from the blower motor 6 (corresponding to the “second suction pump”) to the drainage pipe 9 and the slit 8 through the tank suction port 7a. The drainage tank 7 is provided at the lower part of the outer container 4 in a sealed state, isolated from the storage space of the outer container 4.

The operation and operation of the psychrometer configured as described above will be described below.

First, as described above, the fine mist contained in the outside air flowing in from the suction pipe 5 collides with the inner surface of the measuring container 3 due to the centrifugal force to form water droplets and is separated from the gas. Then, the water droplets generated in this manner adhere to the inner surface of the measuring container 3 and become water droplets having a large particle size.

At this time, the water droplets adhering to the inner surface of the measuring container 3 reach the slit 8 and flow into the drain pipe 9 through the slit 8 by the suction force generated by the blower motor 6. Then, the water droplets that have flowed into the drain pipe 9 are collected in the drain tank 7. By removing the water droplets inside the storage space of the measuring container 3 in this way, the amount of mist that evaporates into the air from the water droplets can be further reduced.

When the gas containing the fine mist flows into the inside of the measuring container 3, the gas containing the mist continuously flows from the suction port 2a as the mist that collides with the inner wall of the measuring container 3 and is separated from the gas. Therefore, it gradually becomes water droplets having a large particle size and flows on the inner surface of the measuring container 3.

At this time, at the interface between the water droplets flowing on the inner surface of the measuring container 3 and the gas flowing inside the measuring container 3, a part of the water droplets flowing on the inner surface of the measuring container 3 is the gas to be measured due to the heat of vaporization when evaporating. Will be cooled.

In this regard, according to the psychrometer according to the present embodiment, the water droplets immediately reach the slit 8 and flow out to the inside of the drain pipe 9 by the suction of the blower motor 6, so that the cooling effect on the gas to be measured becomes minute. .. Then, the water droplets that have flowed out into the drainage pipe 9 are collected in the drainage tank 7. As a result, even if the gas to be measured contains a large amount of mist, it is possible to prevent water droplets from accumulating on the bottom of the measurement container 3, prevent the temperature of the gas from dropping due to evaporation of the water droplets, and accurately dry-bulb. The temperature can be measured.

Each part of the psychrometer according to this embodiment has the following configuration, for example.

As shown in FIG. 6A, the slit 8 extends in a straight line in the vertical direction. Alternatively, as shown in FIG. 6B, the shape may extend in a broken line shape in the vertical direction. In the slit 8 shown in FIG. 6B, a plurality of openings are formed in two rows in a broken line shape. Then, a part of the opening range included in the first row overlaps with a part of the opening range included in the second row in the vertical direction.

In order to manufacture the measuring container 3 by bending a thin metal plate, it is desirable that the slit 8 has a shape extending in a broken line shape in the vertical direction as shown in FIG. 6B.

When the slit 8 has a shape that extends in a straight line in the vertical direction, when the metal plate is curved, the portion where the slit 8 is formed is bent due to stress concentration, and the cross-sectional shape of the measuring container 3 perpendicular to the longitudinal direction is changed. The portion where the slit 8 is formed may be in the shape of a protruding teardrop.

At this point, by making the slit 8 into a broken line shape, the shape of the measuring container 3 perpendicular to the longitudinal direction can be made closer to a perfect circle. As a result, the sucked gas spirals along the inner surface of the measuring container 3 and easily flows to the upper part of the measuring container 3, so that the effect of separating fine mist by centrifugal force can be increased.

Further, by making a part of the opening range included in the first row overlap with a part of the opening range included in the second row in the vertical direction, water droplets can pass between the openings. Therefore, it is possible to prevent the recovery efficiency of water droplets from being lowered.

Further, in order to increase the flow velocity of the gas in the slit 8, the slit width of the slit 8 may be made narrower. As a result, the suction force in the slit 8 is increased, and the water droplets flowing on the inner surface of the measuring container 3 can be sucked more strongly.

As a result, it is possible to prevent a situation in which water droplets adhering to the inside of the measuring container 3 evaporate, and the temperature of the sucked gas drops due to latent heat cooling due to the evaporation, making it impossible to accurately measure the temperature of the sucked gas. it can.

Further, it is desirable that the slit 8 has no chamfered portion on the inner surface side of the measuring container 3. In other words, it is desirable that the slit 8 does not have a shape in which the opening width narrows from the inner surface side to the outer surface side of the measuring container 3. That is, the slit 8 has a shape in which the opening width is substantially constant from the inner surface side to the outer surface side of the measuring container 3, or the opening width expands from the inner surface side to the outer surface side of the measuring container 3.

FIG. 7A shows a configuration in which the measuring container 3 does not have a chamfered portion on the inner surface side, and FIG. 7B shows a configuration in which the measuring container 3 has a chamfered portion on the inner surface side. In FIGS. 7A and 7B, w1 represents the direction in which the sucked gas flows, and w2 represents the mist separated from the sucked gas turned into water droplets.

As shown in FIG. 7B, when the measuring container 3 has a chamfered portion on the inner surface side, the water droplet w2 collides with the chamfered portion when sucked and scatters in the internal direction of the measuring container 3. As a result, uncollectible water droplets are generated, and when the water droplets evaporate in the measuring container 3, the temperature of the sucked gas decreases due to latent heat cooling due to the evaporation.

In this regard, as shown in FIG. 7A, by configuring the measuring container 3 so as not to have a chamfered portion on the inner surface side, it is possible to prevent the water droplet w2 from scattering in the internal direction of the measuring container 3.

As described above, according to the psychrometer according to the present embodiment, the mist can be removed from the accommodation space of the measuring container 3, so that the dry-bulb temperature can be measured with higher accuracy even in an environment containing mist in the outside air. It is possible.

(Third Embodiment)
Next, the psychrometer according to the third embodiment will be described with reference to FIGS. 8 to 9.

FIG. 8 is a schematic diagram showing a schematic configuration of the psychrometer according to the third embodiment. Further, FIG. 9 is a cross-sectional view of a schematic configuration of the psychrometer according to the third embodiment.

The psychrometer according to the second embodiment is different from the psychrometer according to the second embodiment in that it includes a wet bulb temperature measuring unit 10, a water absorbing material 11, and a supply pipe 12.

The wet-bulb temperature measuring unit 10 (corresponding to the "second measuring unit") is a sensor for measuring the wet-bulb temperature. Here, the wet-bulb temperature measuring unit 10 is arranged inside the drain pipe 9 and measures the wet-bulb temperature of the outside air flowing in through the drain pipe 9. As the wet-bulb temperature measuring unit 10, for example, a thermocouple, a mercury thermometer, or the like is used.

The water absorbing material 11 is a moisturizing member that covers the wet-bulb temperature measuring unit 10. The water absorbing material 11 absorbs the water stored in the drainage tank 7 via the supply pipe 12. As the water absorbing material 11, for example, a sponge material or the like is used.

The supply pipe 12 is a pipe that supplies the water stored in the drainage tank 7 to the water absorbing material 11. One end of the supply pipe 12 is connected to the water absorbing material 11, and the other end is arranged inside the drainage tank 7. The supply pipe 12 supplies water to the water absorbing material 11 from the inside of the drainage tank 7 by utilizing, for example, a capillary phenomenon.

By using the mist separated from the air for moisturizing the water absorbing material 11 of the wet-bulb temperature measuring unit 10 in this way, the frequency of supplying water to the wet-bulb temperature measuring unit 10 can be suppressed. Further, by installing the wet-bulb temperature measuring unit 10 inside the drain pipe 9, the wet-bulb temperature measuring unit 10 can measure the wet-bulb temperature in a region where the flow velocity of the sucked gas is stable, and the measurement accuracy can be improved. Can be improved.

Further, the wet-bulb temperature measuring unit 10 can measure the wet-bulb temperature under the condition that the wind speed of the gas to be measured is 2 to 4 m / s according to the JIS standard.

In order to satisfy the condition that the wind speed of the gas to be measured is 2 to 4 m / s, adjustments such as reducing the diameter of the drain pipe 9 and increasing the displacement of the blower motor 6 are appropriately performed.

For example, when the displacement of the gas exhausted from the drainage tank 7 is 40 L / min (0.04 m ³ / min), it is desirable that the cross-sectional area S of the drainage pipe 9 is at least 3.3 cm ² or less. This cross-sectional area is obtained by dividing the displacement of 0.04 m ³ / min by the wind speed of 2 to 4 m / s.

Further, the relative humidity may be calculated using the dry-bulb temperature and the wet-bulb temperature measured by the psychrometer of the present invention. The relative humidity can be calculated using, for example, the following equations (1) and (2).

First, the vapor pressure e is calculated using the Sprung formula of the following equation (1).

Next, the vapor pressure e of the environment obtained by the above equation (1) is converted into a relative humidity by using the following equation (2).

In this way, the relative humidity in the air can be obtained with high accuracy even in an environment containing fine mist in the air.

As described above, according to the psychrometer according to the present embodiment, it is possible to measure the wet-bulb temperature with high accuracy. Further, as described above, by obtaining the dry-bulb temperature, the wet-bulb temperature, and the relative humidity in the air, it also contributes to the operation control of the mist generator installed on the road, for example.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

For example, in the above-described embodiment, the outside air sucked from the lower part of the measuring container 3 passes between the outer surface of the inner tube 2 and the inner surface of the measuring container 3 and flows from the upper end of the inner tube 2 into the inner tube 2. It is decided that the discharge is discharged from the lower end of the inner pipe 2 to the outer container 4, passes between the outer surface of the measurement container 3 and the inner surface of the outer container 4, and is discharged from the upper end of the outer container 4.

However, the route of the outside air is not limited to this, and the outside air discharged from the lower end of the inner pipe 2 may be discharged from the lower end of the outer container 4 or discharged from the side surface of the outer container 4. It may be that. The inner tube 2 or the outer container 4 does not necessarily have to be provided, and the psychrometer may be configured so that the centrifugal force acts on the outside air inside the measuring container 3 and the fine mist is separated from the outside air.

The description of the present specification and the accompanying drawings will clarify at least the following matters.

A measuring unit 1 for measuring the dry-bulb temperature, a tubular measuring container 3 for accommodating the measuring unit 1 in the accommodating space, one end is open to the outside air, and the other end is the center of the accommodating space in the accommodating space. Disclosed is a psychrometer including a suction pipe 5 arranged in a direction eccentric from the shaft.

According to this psychrometer, the mist can be separated from the outside air even in an environment containing mist in the outside air, so that the dry-bulb temperature can be measured with high accuracy.

Further, the wetness and humidity meter further includes a tubular inner tube 2 for accommodating the measuring unit 1, and the inner tube 2 is arranged in the accommodating space and sucks the outside air sucked into the accommodating space. The suction port 2a and the discharge port 2b for discharging the outside air sucked from the suction port 2a are provided, and the other end of the suction pipe 5 is the inner pipe 2 in the direction along the central axis of the accommodation space. It may be provided at a position away from the suction port 2a.

According to this psychrometer, it is possible to more reliably prevent the vaporization of the mist separated from the outside air, so that the dry-bulb temperature can be measured with higher accuracy.

Further, this psychrometer has a discharge port 4a for discharging outside air, further includes a tubular outer container 4 for accommodating the measurement container 3, and the outer container 4 is a discharge port 2b of the inner pipe 2. The outside air discharged from the discharge port 2b may be guided between the outer surface of the measuring container 3 and the inner surface of the outer container 4 and discharged from the discharge port 4a.

According to this psychrometer, it is possible to prevent the measuring container 3 from coming into contact with the outside air, so that the temperature of the measuring container 3 can be stabilized at an early stage.

Further, the psychrometer may further include a suction pump 6 connected to the discharge port 4a of the outer container 4.

Further, in this psychrometer, a slit 8 provided so as to penetrate the side surface of the measuring container 3 and drainage arranged on the outer surface side of the measuring container 3 so that one end is connected to the slit 8. A pipe 9 and a drainage tank 7 to which the other end of the drainage pipe 9 is connected may be further provided.

According to this psychrometer, it is possible to more reliably prevent the vaporization of the mist separated from the outside air, so that the dry-bulb temperature can be measured with higher accuracy.

Further, the psychrometer may further include a second suction pump 6 connected to the drainage tank 7.

Further, the psychrometer is arranged in the drain pipe 9, and has a second measuring unit 10 for measuring the wet-bulb temperature, a water absorbing material 11 for covering the second measuring unit 10, and one end of the water absorbing material. A supply pipe 12 connected to the material 11 and having the other end disposed in the tank of the drainage tank 7 may be further provided.

According to this psychrometer, it is also possible to measure the wet-bulb temperature with high accuracy.

The psychrometer according to the present disclosure can be suitably used in an environment in which the gas to be measured contains fine mist.

1 Measuring unit 2 Inner pipe 3 Measuring container 4 Outer container 5 Suction pipe 6 Blower motor 7 Drain tank 8 Slit 9 Drain pipe 10 Wet-bulb temperature measuring unit 11 Water absorbing material 12 Supply pipe 91 Casing 92 Ventilation passage 93 Measuring unit 94 Blower fan 95 Electronic machine

Claims (7)

A measuring unit that measures the dry-bulb temperature and
A tubular measuring container for accommodating the measuring unit in the accommodating space,
A suction pipe having one end open to the outside air and the other end arranged in the accommodation space in a direction eccentric from the central axis of the accommodation space.
And a inner tube tubular accommodating said measuring unit,
The inner pipe is arranged in the accommodation space and has a suction port for sucking the outside air sucked into the accommodation space and a discharge port for discharging the outside air sucked from the suction port.
The other end of the suction pipe is provided at a position away from the suction port of the inner pipe in the direction along the central axis of the accommodation space.
The outside air flowing out from the other end of the suction pipe into the measuring container spirally flows along the inner surface of the measuring container, and after the mist contained in the outside air is separated as water droplets, the inner pipe Flows into the suction port of
Psyrrometer. It has a discharge port for discharging outside air, and further includes a tubular outer container for accommodating the measurement container.
The outer container communicates with the discharge port of the inner pipe, guides the outside air discharged from the discharge port between the outer surface of the measurement container and the inner surface of the outer container, and discharges the outside air from the discharge port. The psychrometer described in. The psychrometer according to claim 2, further comprising a suction pump connected to the discharge port of the outer container. A slit provided so as to penetrate the side surface of the measuring container,
A drainage pipe arranged on the outer surface side of the measuring container so that one end is connected to the slit.
The psychrometer according to claim 1, further comprising a drainage tank to which the other end of the drainage pipe is connected. The psychrometer according to claim 4, further comprising a second suction pump connected to the drainage tank. A second measuring unit, which is arranged in the drain pipe and measures the wet-bulb temperature,
A water absorbing material that covers the second measuring section,
One end is connected to the water absorbing material, and the other end is a supply pipe arranged in the drainage tank.
The psychrometer according to claim 4, further comprising. The psychrometer according to claim 1, wherein the measuring container is formed by welding either an aluminum material or a copper material .

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