JPH10246675A - Wet ball wick water-supplying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent various germs from being reproduced by eliminating a float and hence simplifying a structure. SOLUTION: Dry-bulb and wet-bulb temperatures t and t' are measured by dry-bulb and wet-bulb temperature sensors 4 and 1, respectively, and the sensors are loaded into a water-supply control part 6 and then amount of wick water consumption is obtained by an expression being stored in advance, and the operation rate of an electromagnetic pump 4 is controlled so that the amount of water where a small amount of surplus water is added can be fed. The surplus water is overflown from the water supply port of a wick pan 3, thus eliminating the need for controlling the water level due to a float. The water level is controlled by changing the amount of water feed according to usage conditions, thus reducing the surplus water, eliminating the need for the collection, and simplifying a device. Since the water supply part of the wick pan is short and, for example, a tank for controlling water level is eliminated, thus reducing the amount of preserved water, reducing the residence time of water, and suppressing the reproduction of various germs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet bulb wick water supply apparatus for supplying water to a water reservoir for supplying water to a wick covered with a wet bulb temperature detecting section, and for example, an environmental test apparatus such as a thermo-hygrostat. And humidity measurement by dry bulb and wet bulb of air conditioner.

[0002]

2. Description of the Related Art As a wet-bulb wick water supply device such as a thermo-hygrostat, for example, as shown in FIG. 7, a long wick pan arm 3 'is provided through a heat insulating wall 101 of a thermo-hygrostat. On the inside of the vessel, the wick 2 covered with the wet-bulb temperature sensor 1 is immersed in the wick pan arm 3 ', and a water supply 20 is connected to the outside of the vessel. 22 was connected, the tip of a water supply nozzle was opened and closed by a float 23 provided in the water supply device, and water was supplied to the wick pan arm via the water supply device. In this case, the water supply nozzle 21 has 0.01 to 0.1 kgf / cm ² G
Since water at a pressure of about 1 mm is supplied, the water supply nozzle has a small diameter of, for example, about 1 mm so that the water can be closed by a float force. In some cases, a head tank (not shown) may be further provided on the water supply device 20.

[0003] However, in such a wet-bulb wick water supply device, since the water supply nozzle is small, air or foreign matter mixed in the water supply system may not come off and water may not come out.
In addition, since the wick pan arm is long and the water supply device 20 is provided, the amount of retained water is increased, so that the residence time of water is prolonged and bacteria tend to accumulate. Furthermore, it was difficult to adjust the water level due to the long wick pan arm, which took time. Further, there is a problem that the water supply device 20, the head tank and the attached piping system which may be provided on the water supply device 20 protrude outside the main body of the constant temperature and humidity chamber to occupy space, and the outer shape of the entire device becomes large. .

On the other hand, in addition to the indispensable water supply tank, a water level detection tank corresponding to the water supply device and a second water supply tank for collecting water overflowing therefrom are provided. A wet-bulb wick water supply system in which the amount of evaporation is sent to a water level detection tank by an air pump, and the overflowed water is collected in the water supply tank via the second water supply tank, and the float switch is eliminated to achieve maintenance-free operation. (See Japanese Patent Application Laid-Open No. 8-108079). In this apparatus, since the water supply amount is set to a predetermined constant amount, it is necessary to set the water supply amount to the maximum amount of water evaporation from the wick under the operating conditions of the thermo-hygrostat. For this reason, the amount of water supply becomes excessive under many operating conditions. Therefore, a water level detection tank for overflowing the water and a second water supply tank for collecting overflow water are provided.

However, in such an apparatus, FIG.
Can solve the problems related to the float switch in the apparatus described in (1), but cannot solve the problems such as the germs easily accumulating and the wick drying easily, and the tank and piping protruding outside to increase the outer shape of the apparatus.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wet-bulb wick water supply apparatus which solves the above-mentioned problems in the prior art and has a small size, a simple structure, and in which germs are hardly propagated.

[0007]

In order to solve the above-mentioned problems, the present invention provides a wet-bulb for supplying water to a water reservoir for supplying water to a wick covered by a wet-bulb temperature detector. In a ball wick water supply device, water supply means for sending water to the water sump, detection means for detecting a state variable related to the amount of water evaporated mainly from the water sump via the wick, and detection of the detection means A control that outputs an estimated amount of evaporation close to the amount of evaporation based on the value and controls the water supply means to supply a water amount between the amount of evaporation and an additional amount of evaporation that is a predetermined amount larger than the amount of evaporation based on the estimated amount of evaporation. Means, and a wet-bulb wick water supply device.

According to a second aspect of the present invention, in addition to the above, the detecting means includes the temperature detecting section for detecting a wet bulb temperature and a temperature detecting means for detecting an environmental temperature where the wick is placed. The control means calculates the estimated amount of evaporation from the difference between the environmental temperature and the wet bulb temperature.

A third aspect of the present invention, in addition to the features of the first aspect of the present invention, is characterized in that the water supply means is an electromagnetic pump which, when supplied with power, discharges an amount of water proportional to the supply time.
The control means controls the supply time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of the overall configuration of a wet-bulb wick water supply apparatus to which the present invention is applied. The wet-bulb wick water supply device is provided in a thermo-hygrostat provided with a main body 100 surrounded by a heat insulating wall 101, and supplies water to a wick 2 covered by a wet-bulb temperature sensor 1, which is a wet-bulb temperature detecting unit. For supplying water to the wick pan 3, which is a water reservoir for water supply, and includes an electromagnetic pump 4 as water supply means, a temperature sensor 5 and a wet bulb temperature sensor 1 as detection means, a water supply control section 6 as control means, and the like. . In addition, a portable tank 7 for transporting water, a water supply tank 8 installed in a thermo-hygrostat, a humidifier 9 formed at the bottom of the thermo-hygrostat main body 100 for humidity adjustment, a drain pipe 10 and a drainage Solenoid valve 10a, a water supply pipe 11, a drain pipe 12, and the like.

FIG. 2 shows an example of the structure of a wick pan 3 used in the above wet bulb wick water supply device. Wick bread 3
The outer cylinder 31 has a mounting seat 31a as a supported portion, support plates 31b and 31c on one end side and the other end side as a support portion, a support seat 31d, and a drain receiving portion 31 as a water passage portion.
e, having a nozzle portion 31f as an outlet. The mounting seat 31a is a support fitting 1 fixed inside the heat insulating wall 101.
02 is fixed by screws or the like, and attached to a thermo-hygrostat via a support fitting. The support plates 31b and 31c have holes, into which both ends of the inner cylinder 32 are inserted and supported.

The drain receiving portion 31e is formed below the inner cylinder 32 so as to form a water passage corresponding thereto.
That is, as shown in FIG. 1 (c), the section extends to the tip of the inner cylinder 32, has a horseshoe-shaped cross section so as to surround the side and lower portions thereof, and is formed so as to have an appropriate slope as a water channel. ing. The drain tube 12 shown in FIG. 1 is connected to the nozzle portion 31f.

The inner cylinder 32 has a structure in which a pipe is partially cut off, and the water supply pipe 11 shown in FIG.
Pipe end 32a as a connecting portion connected through the water, a water reservoir 32b into which water is filled, and a partition weir 32 as a weir
c, a drainage channel 32d for draining overflow water exceeding this, an end member 3 supported by a support plate 31c of an outer cylinder
2e, etc.

The tube end 32a is inserted and supported in the hole of the support plate 31b of the outer cylinder as described above. Water tank 32b
As shown in FIG. 3 (d), the cross section of which the upper part of the pipe is cut off has a horseshoe shape, and when water is supplied, the partition weir 32c
As a result, the water level becomes as shown by the dashed line in FIG.

The partitioning weir 32c is provided at a position distant from the pipe end 32a to which the water supply pipe is connected and close to the end 2a of the water sucking portion of the wick 2, as shown in FIG. As shown, the height is h from the bottom of the water reservoir 32b. The height h is a height at which the wick 2 can maintain a water level equal to or higher than a minimum water level necessary for sucking up water. However, when water is sent at short time intervals,
Since the water level hardly fluctuates, the water level only needs to be above the required minimum water level by an appropriate height. The weir portion may be of various shapes, such as a V-shaped weir, a U-shaped weir, an arc-shaped weir, or a partial weir, in addition to the entire weir as shown.

As shown in FIG. 1E, a boss 31g is integrally formed on the support plate 31b of the outer cylinder 31, and the end tube 32a of the inner cylinder 32 is fitted into this part, and only this part is fitted. The structure can be simplified so as to support the inner cylinder.
In this case, the connection pipe 33 is formed integrally with the inner cylinder 32 downward from the inner cylinder 32.

Above the wick 3, a heat insulating wall 101 is provided.
The wet-bulb temperature sensor 1 also shown in FIG. 1 is attached, and the wick 2 is put on the wet-bulb temperature sensor 1, and the lower end portion is immersed in the water in the water reservoir 32b. The wick 2 sucks the water up to the wet bulb temperature sensor 1. The water absorbed by the wick evaporates by an amount determined by the surrounding environmental conditions.

The wick pan shown in FIG. 2 is very advantageously applied to the wet-bulb wick water supply apparatus of the present invention. However, in the wet-bulb wick water supply device of the present invention, a wick pan capable of overflowing a part of the supplied water and discharging the same can be employed in addition to the one shown in FIG. For example, in FIG.
2 is directly attached to the heat insulating wall 101, and a structure in which a drain pipe can be directly connected to the drain passage 32d can be used.

FIG. 3 shows an example of the results of an experiment performed to determine the wick water consumption, which is the amount of water evaporated from the wick pan 3 mainly through the wick. This experiment is
Using a thermo-hygrostat as shown in FIG. 1, the flow rate of air blown into the vessel was maintained in the range of 5 to 6 m / s, and the inside of the vessel was subjected to various temperature and humidity conditions. The wick water consumption was measured by continuously operating for 4 hours or more under each temperature and humidity condition. In the figure, the horizontal axis is the difference (t-t ') ° C between the dry bulb temperature (t) and the wet bulb temperature (t'), and the vertical axis is the wick water consumption (cc / h). Numerical values in the figure indicate temperature and humidity conditions. For example, 85/20 indicates a temperature of 85 ° C.
Means relative humidity of 20%.

It is known that the diffusion amount G when a liquid evaporates and diffuses in one direction can be generally obtained by Stephan's law shown by the following equation: G = − [D / RT] · [P / (Pp)]. Dp / dx --- (1) Here, when water evaporates and diffuses into the atmosphere, D is a diffusion coefficient of water vapor diffused into the atmosphere, and R is water vapor. , T is the absolute temperature of water and water vapor, P is the total pressure of the humid air, which is a gaseous mixture around water, that is, the pressure in the thermo-hygrostat, which is almost atmospheric pressure, p is the partial pressure of water vapor, ( dp / dx) is the water vapor partial pressure gradient from the wick surface to the diffusion direction.
(Dp / dx) is a negative value because water evaporates on the surface of the wick and the partial pressure of water vapor is high.

When the partial pressure is smaller than the total pressure, the above equation is approximately expressed by G = (D / RT). (Ps-pa) / δ-(2). Here, ps is a saturated vapor pressure at the temperature of water, pa is a partial pressure of water vapor at a position sufficiently distant from the water vapor evaporating from the wick, that is, an appropriate position in the thermo-hygrostat, δ is The distance until the partial pressure gradient becomes zero, that is, the thickness of the boundary layer. In this equation,
Since (ps−pa) = αP (t−t ′) (α is a coefficient determined by wind speed or the like), the equation (2) is given by: G = (D / RT) · αP (t−t ′) / δ− −−−− (3)

In equation (3), D, R, and P are constant values. (Tt ′) changes depending on the temperature and humidity conditions. T
And δ also change depending on the temperature and humidity conditions, but the rate of change is relatively small and changes in a direction to offset each other. Therefore, it is considered that the amount of evaporation of water from the wick is governed by (tt ′), that is, the difference between the dry bulb temperature and the wet bulb temperature.
As shown in the above, the experimental values were represented on the horizontal axis of (tt ′). As a result, under various temperature and humidity conditions, the measurement point was plotted at a position close to the straight line L, and it was found that the wick water consumption and the dry bulb / wet bulb temperature difference formed a proportional relationship with considerable accuracy. Note that the straight line M shown is a line approximately 10% above the straight line L, and the straight line N is a line obtained by reducing the value of M to a fixed value.

Based on the above experiment, in this example,
As described above, using the wet-bulb temperature sensor 1 and the temperature sensor 5 as the detection means, the environmental temperature at which the wick is placed, that is, the environmental variable mainly related to the amount of water evaporated from the wick pan 3 via the wick, that is, The temperature t in the thermo-hygrostat and the wet bulb temperature t 'are measured.

The water supply control section 6 controls the electromagnetic pump 4 based on the detected values of the temperature t and the wet bulb temperature t 'so as to supply the water amounts indicated by the straight lines M and N in FIG.
That is, the straight line L is a line representing the estimated evaporation amount G close to the true evaporation amount evaporated from the wick pan 3, and the straight line M is
The electromagnetic pump 4 is controlled so as to supply a water amount of a straight line M based on a line representing a water amount between the true evaporation amount and the additional evaporation amount which is about 10% larger than the true evaporation amount.

For this reason, first, in an actual device such as a thermo-hygrostat to which the wet-bulb wick water supply device is mounted, the estimated evaporation amount line L and the extra evaporation amount line M based on the estimated evaporation amount line L are determined in advance by trial operation and the like. The data of the line L or M is formed into any form of a graph, a mathematical expression, a numerical table, or the like, and is incorporated in the control program of the water supply control unit 6. If a result as shown in FIG. 3 is used in the case of a mathematical expression, it is expressed as M = L + b = a (t-t ') + b ---- (4). Here, in the example of FIG. 3, the coefficient a is 0.94. The constant b represents the surplus water amount, and is 5 (cc / h). It should be noted that a mathematical expression that satisfies M = a′L = a ′ (t−t ′), for example, a ′ = 1.1a may be used. The water supply control unit 6 inputs the measured values of the dry-bulb and wet-bulb temperature sensors 5 and 1 and calculates (tt ′), and then determines the wick consumption water amount G by, for example, the above equation (3).

Under the conditions where (t-t ') becomes small and the amount of water evaporated from the wick 2 becomes less than a certain amount, the residence time of water in the wick pan 3 becomes longer. In this example, a constant amount line N for ensuring the minimum flow rate is provided so as to prevent the above. Therefore, the control unit 6
When (tt ′) is about 10 ° C. or less, the electromagnetic pump 4 is controlled so that the water amount N always flows.

FIG. 4 shows an example of the flow characteristics of the electromagnetic pump 4. In the figure, the horizontal axis indicates the power supply time, that is, the ratio of the time during which the electromagnetic pump 4 is operated, and in this case, the time ratio φ during which the electromagnetic pump 4 is operated during a fixed period of 10 seconds. For example, if φ = 0.04, the time of 4%, that is, 1
Every 0 seconds means running for 0.4 seconds. The vertical axis represents the electromagnetic pump 4 when operated at the operation time ratio.
Shows the flow rate per hour. As described above, when power is supplied, the electromagnetic pump discharges a water amount Q indicated by a straight line proportional to the supply time. In the case of the wick water consumption in FIG. 3, φ takes a value in the range of about 0.01 to 0.05.

In this embodiment, since the electromagnetic pump 4 having such characteristics is used, the flow rate characteristic of the electromagnetic pump 4 shown in FIG. , A mathematical expression, a numerical table, or the like. In the case of a mathematical expression, for example, it is given as φ = cQ −−−− (5) In the example of FIG. 4, the coefficient c is 0.001.
become. After determining the wick consumption water amount G as described above, the water supply control unit 6 calculates the operation time φ from the equation (5) and outputs the calculated operation amount φ as Q, and outputs the operation time φ via the solid-state relay (SSR) 61 as a driver. Thus, the operation time of the electromagnetic pump 4 is controlled. In the SSR 61, a voltage composed of an AC half-wave is applied.

FIG. 5 shows another example of the flow characteristics of the electromagnetic pump 4. As a method of controlling the operation time, a method in which the power supply time for one operation, that is, the operation time is fixed, and the time interval for performing such operation, that is, the length of the cycle, may be used. In the illustrated example, a pump having a larger flow rate than the case of FIG. 4 is used, one operation time is set to 40 msec, and a cycle T is calculated from a required pump flow rate Q. The pump 4 is controlled to operate for 40 msec. In this case, T = k / Q (6) In the example of FIG. 5, k = 400. It should be noted that a graph, a numerical table, or the like may be used instead of the above equation, as in the previous example.

The water supply control section 6 is provided with an operation portion 6a, which can select automatic water supply, initial water supply, and stop. If automatic water supply is selected, water supply control according to the operating conditions is performed as described above. When the initial water supply is selected, the electromagnetic pump 4 is operated at an output of 100%, that is, continuously, and after a lapse of time sufficient for the amount of water required for the wick pan 3 to elapse, control is performed by a timer (not shown) to stop the electromagnetic pump. Done. Thereby, initial water supply can be performed promptly.

The above wet bulb wick water supply device operates as follows. The wick pan 3 is previously filled with water by the above-described initial water supply operation, and is in an automatic water supply state. When the thermo-hygrostat is operated, a circulating blower, a heater, a cooler, a humidifier 9 and the like (not shown) are operated,
Air whose temperature and humidity have been adjusted circulates inside the main body, and a sample such as an electronic component placed in the container is tested under target environmental conditions. During this time, environmental conditions are changed as necessary, but the wet-bulb wick water supply device is automatically operated so as to cope with the change.

That is, the temperature t and the wet-bulb temperature t 'measured by the dry-bulb and wet-bulb temperature sensors 4 and 1 are input to the water supply control unit 6, and the control unit uses the equations (4), (5) and the like. On the basis of,
G and φ are sequentially calculated (tt ′), the electromagnetic pump 4 is operated intermittently at every control cycle via the SSR 61, and the water amount G is sent to the wick pan 3. For example, (tt ′) is 20
At ° C, the measured water consumption is 18.8 cc / h, the water supply amount G is 23.8 cc / h, and the operation rate φ of the electromagnetic pump 4 is set to 0 so that this amount of water is sent to the wick pan 3. 0.238 every 10 seconds
You will drive for seconds. When the operating state of the thermo-hygrostat changes and the value of (t-t ') changes, the water supply amount of the electromagnetic pump 4 changes correspondingly.

The operating condition in the thermo-hygrostat is 0 ° C.-1
When the temperature is outside the range of 00 ° C. or when the operation is stopped for a long period of time, the drainage solenoid valve 10 a is opened to prevent freezing and evaporation of water in the inner cylinder 32 and to prevent propagation of various bacteria. Then, the water in the water tank 32b of the inner cylinder is drained through the water pipe 11 and the drain pipe 10. Also in this case, according to the wick pan shown in FIG. 2, since the water supply pipe 11 can be directly connected to the end pipe portion 32a of the inner cylinder, the drainage can be performed easily and quickly.

According to such a water supply device, the estimated water consumption becomes a value close to the true evaporation from the wick pan, and this is calculated and controlled to the water supply corresponding to the calculated value. The amount of wasteful excess water supply can be made extremely small. That is, as in the case of a fixed amount of water supply in the prior art, the maximum water amount is always 50 cc /
If an amount of water of about h is supplied, in the above example, 31.2 cc
/ H of water is extra, but in the device of this example, this is 5c
c / h.

On the other hand, since the amount of consumed water is accurately estimated and controlled according to the operating conditions as described above, even if the amount of excess water is small, the required amount of water can be reliably supplied, and the wick 2 has insufficient water supply. Never be.

Since the amount of surplus water is small, there is no need to recover the water, so that the tank and the piping system attached to the tank as in the prior art are not required, and the structure of the water supply device is extremely simple with the minimum necessary. It can be something.
And, of course, the equipment cost can also be reduced.

A small surplus of about 5 cc / h of the water sent to the water tank 32b of the inner cylinder of the wick pan 3 is dropped to the drain receiver 31e of the outer cylinder after passing through the partition weir 32c. It is put into the humidifier 9 from the drain pipe 12.
Since this water is a small amount, when the humidifier is not provided at the bottom of the thermo-hygrostat or the like, the humidifier can flow into a drainage groove or the like at the bottom. In the operation state where (tt ′) is small, overflow water slightly increases, but such an amount of inflow or drainage of water into the humidifier does not matter.

Further, according to the wet-bulb wick water supply apparatus of this embodiment, water is directly supplied from the electromagnetic pump 4 to the wick pan via the water supply pipe 11, and a float tank and a water level detection tank are not provided as in the related art. Since the wick pan does not penetrate the heat-insulating wall in the main body of the thermo-hygrostat and the like and its length is shortened, the amount of water held in the wick pan can be greatly reduced. On the other hand, since the evaporation amount of water from the wick is the same, the smaller the amount of water retained, the shorter the residence time of water, and the fresher water is supplied to the wick. As a result, the temperature detection accuracy is improved, and the propagation and adhesion of various bacteria in the wick bread portion can be significantly reduced.

Since no float tank is provided,
The adjustment of the water level becomes unnecessary. In addition, when the length of the wick pan is reduced, the inclination of the wick pan can be easily adjusted. As a result, attachment and adjustment of the wet bulb wick water supply device are facilitated. Furthermore, since water is directly sent from the electromagnetic pump 4 to the wick pan, there is no restriction on the size of the piping unlike the case where a float tank is provided, and the size can be increased to a necessary and sufficient size. As a result, there is no risk of blockage due to air or various bacteria. Further, since the water level is not adjusted by the float, it is not necessary to provide a pressure equalizing pipe for stabilizing the water level, and the construction for the same is not required.

Further, if the wick pan 3 is structured as shown in FIG. 2, even if dew condensation occurs under the water container 32b of the inner cylinder when the inside of the container is set to a high temperature and high humidity condition, the dew condensation does not occur. Since it falls into the drain receiving portion 31c of the outer cylinder, it is possible to prevent a problem that the sample falls directly down and hits the sample. On the other hand, since only a small amount of overflow water falls into the drain pipe and no water is accumulated, no dew condensation occurs outside the drain pipe. Therefore, the problem of dew condensation on the wick pan is solved.

Furthermore, since the overflow weir 32c is located close to the wick 2, the water depth does not change so much at the wick even if the water surface is slightly inclined. There is no need to tilt or deepen. Therefore, from this point as well, the amount of water retained in the wick bread portion can be reduced.
Further, in the inner cylinder 32, the water supplied from the partition weir 32c remote from the pipe end overflows through the water inlet 32b in which water is supplied from the end pipe 32a and the wick is immersed. No portion is generated, and new water is supplied to the wick, and the water inside is sequentially and evenly replaced by the wick consumption water and the overflow water, so that the above-described effect of suppressing the propagation of various bacteria is further improved.

In the above example, the dry-bulb temperature and the wet-bulb temperature are used as the state variables related to the amount of water evaporated from the wick. However, according to this method, a temperature sensor normally provided is used. Wick water consumption can be obtained simply and accurately. However, when a hygrometer such as a chemical hygrometer or an electric hygrometer is provided, the wick water consumption may be calculated from the measured humidity using these. For example, since the relative humidity also has a certain relationship with the temperature difference between the dry bulb and the wet bulb, the wick water consumption can be accurately calculated using the relative humidity. Also, in a thermo-hygrostat,
The temperature and humidity to be tested are set with the setting device, and the heater, cooler, and humidifier are controlled so that the temperature and humidity are the same. I do. Therefore, the dry bulb temperature, the wet bulb temperature, the relative humidity, etc. for estimating the wick water consumption need not necessarily be the actually measured values directly detected by the sensor, and the set values of the temperature, the humidity, etc. are used as the detected values, These may be input to the water supply control unit 6.

In the above, the electromagnetic pump 4 is used as the water supply means.
The example in which the operation time is controlled by using is described. By doing so, it is possible to send a very small amount of water in a short cycle, always maintain the water in the wick pan at a constant and maximum level while overflowing a very small amount of water, and provide a stable and good wick. Water supply conditions can be given. However, it is also possible to use other types of positive displacement pumps and the like. As an example of the control method of the operation time, an example in which the control period is fixed and the power supply time is controlled during the control period has been described. May be used to control the length of.

FIG. 6 shows another example of the structure of the wick pan. The wick pan of this example is applied to a self-cleaning wick. In other words, the water absorbing portion 2b where the wick 2 sucks up water.
And a washing part 2c for dropping a part of the sucked water from the lower end. The drain part 32d of the wick pan 3 is longer than that shown in FIG. 2, and the washing part 2c is inserted therein. . The water dropped from the cleaning unit 2c is drained from the drain receiving unit 31e together with the overflow water.
In such a wick, the treatment of the wick washing water is facilitated by the wick pan to which the present invention is applied. Even with this wick bread, the various effects described above are maintained.

[0045]

According to the first aspect of the present invention, since the water supply means, the measurement means and the control means for sending water to the water reservoir in which the wick is immersed are provided, the measurement means evaporates from the water reservoir mainly through the wick. For example, dry-bulb and wet-bulb temperatures are measured as state variables related to water evaporation, and sent to control means.The control means calculates the measured evaporation close to the true evaporation by calculation or the like based on the measured value. In accordance with this, the required water supply amount is secured by controlling the water supply means so as to supply a water amount between the true evaporation amount and a predetermined evaporation amount, for example, about 10% higher than the true evaporation amount. At the same time, it is possible to reduce the amount of excess water supply that is wasted.

As a result, there is no need to provide a float tank to control the water level or to collect the surplus water supply, which eliminates the need for tanks and associated piping, greatly simplifies the structure of the water supply device, and reduces the equipment required. Costs can be reduced. In addition, the installation space of the wet-bulb wick water supply device can be reduced, and the size of the entire device to which the device is mounted can be reduced.

Further, since water is directly supplied from the water supply means to the water reservoir, the water reservoir does not need to penetrate through the heat insulating layer or the like, and is shortened. Further, since the attached tanks are not required, the water reservoir portion is not required. The amount of water held can be greatly reduced. As a result, the residence time of water is shortened, the temperature detection performance of the wick is improved by supplying fresh water, and the propagation and adhesion of various bacteria are greatly suppressed. In addition, the water level adjustment of the float becomes unnecessary, and the inclination adjustment of the water pool becomes easy,
Mounting and adjustment of the wet bulb wick water supply device can be facilitated. Furthermore, by direct water supply from the water supply means to the water reservoir, there is no restriction on the size of the pipe, and the size of the pipe can be reduced to a necessary and sufficient size to prevent clogging by air or various bacteria.

According to the second aspect of the present invention, since the temperature detecting section for detecting the wet bulb temperature and the temperature detecting section for detecting the environmental temperature where the wick is placed are used as the measuring means, the temperature measuring means is actually used as the measuring means. Only detection means will be added. However, since the temperature detecting means is a means usually provided in, for example, a thermo-hygrostat or the like to which the wet-bulb wick water supply device is mounted, there is substantially no additional measuring means. Then, according to an experiment or the like, the evaporation amount of water from the wick can be accurately calculated based on the difference between the dry bulb temperature and the wet bulb temperature. As a result, the wick water consumption can be easily and accurately obtained.

According to the third aspect of the present invention, when the water supply means is an electromagnetic pump for discharging a water amount proportional to the supply time when power is supplied, and the power supply time is controlled by the control means, the water supply means is minute. Water at a flow rate can be sent in a short cycle, and the water level in the water reservoir can be maintained at the highest water level that hardly fluctuates. As a result, stable and good water supply conditions can be given to the wick, and the measurement accuracy of the wet bulb temperature can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration example of a wet bulb wick water supply device to which the present invention is applied.

FIGS. 2A and 2B show examples of the structure of a wick pan applicable to the above-described apparatus, wherein FIG. 2A is a sectional view, FIG. 2B is a plan view, FIG. 2C is a side view, FIG. (e) is a sectional view of another structural example.

FIG. 3 is a curve diagram showing an experimental result of measuring wick water consumption.

FIG. 4 is a curve diagram showing an example of a flow characteristic of an electromagnetic pump.

FIG. 5 is a curve diagram showing another example of the flow characteristics of the electromagnetic pump.

FIGS. 6A and 6B show examples of the structure of a wick pan applied to a self-cleaning wick, where FIG. 6A is a cross-sectional view and FIG.

FIG. 7 is a sectional view showing a structural example of a wick pan arm portion of a conventional wet bulb wick water supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wet bulb temperature sensor (wet bulb temperature detection part) 2 Wick 3 Wick pan (water pool) 4 Electromagnetic pump (water supply means) 5 Temperature sensor (detection means) 6 Water supply control part (control means)

Claims (3)

[Claims] 1. A wet-bulb wick water supply device for supplying water to a basin for supplying water to a wick covered by a wet-bulb temperature detector, comprising: a water supply means for supplying water to the basin; Means for detecting a state variable related to the amount of evaporation of water evaporating from the water sump, and estimating the amount of evaporation close to the amount of evaporation based on the detection value of the detecting means, and And a control means for controlling the water supply means so as to supply a water amount between the evaporation amount and a predetermined evaporation amount larger than the evaporation amount, by a wet bulb wick water supply device. 2. The temperature control device according to claim 1, wherein the detecting unit includes the temperature detecting unit that detects a wet bulb temperature and a temperature detecting unit that detects an environmental temperature where the wick is placed. The wet bulb wick water supply device according to claim 1, wherein the estimated evaporation amount is calculated from a difference from a temperature. 3. The apparatus according to claim 1, wherein said water supply means is an electromagnetic pump for discharging a water amount proportional to a supply time when power is supplied, and said control means controls said supply time. Wet bulb wick water supply as described.