JPH08136015A - Operating method for wick water feed apparatus - Google Patents

Abstract

PURPOSE: To maintain an accurate water level surface without being affected by scale and the like while minimizing a range of fluctuations of a temperature of water when water is fed. CONSTITUTION: A control valve 69, which is controlled to be freely opened and closed, is kept in an 'open' state for a fixed period of time and, after sending water in a storage tank 59 into a water feed tank 53 according to the difference of a water level between both the tanks, an air pump 67 is turned 'ON' for a fixed period of time to send water in the water feed tank 53 into a water level detecting tank 39 connected to a wick water feed tank 25. Water excessively sent into the water level detecting tank 39 within the ON time is discharged through an overflow pipe 49 provided in the water level sensor, thus maintaining a fixed water level surface in the wick water feed tank 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a wick water supply device for a thermo-hygrostat.

[0002]

2. Description of the Related Art Generally, in a thermo-hygrostat, for example,
As shown in FIG. 6, a wick water supply pipe 103 is provided in the constant temperature and humidity body 101, and a water level detection tank 105 is connected to the wick water supply pipe 103. Wick water pipe 10
The lower end of the wick 109 attached to the wet bulb temperature detection end 107 is exposed to the surface 3, and the wick 109 sucks up the water in the wick water supply pipe 103. The water in the water supply tank 113 is sent to the water level detection tank 105 by the drive pump 111, and the drive pump 11 corresponding to the water level surface in the water level detection tank 105.
A float switch 115 for turning on / off 1 is provided.

[0003]

Float switch 11
In No. 5, when the water level surface rises, the float 114 rises along the guide pin 117, and when it reaches a prescribed water level level, a detection signal flows, and the detection signal turns off the drive pump 111 via the control unit 119. To do. As a result, a predetermined water level surface is secured in the wick water supply pipe 103, and the conventional means manages the water level surface by the float switch 115.

The water level control means by the float switch 115 brings about the following problems.

(1) The distance between on and off of the float switch reed relay terminal of the float switch 115 is structurally
A minimum of 2 to 3 mm is required, and it is difficult to control the accuracy further and the control width becomes large.

For this reason, the amount of water supplied into the wick water supply pipe 103 at one time also increases, and the rapid change in water temperature accompanying the amount of water supply adversely affects the detection by the wet bulb temperature detection end 107. Like

(2) Float 1 of the float switch 115
14 is a part which moves up and down along the guide pin 117,
If water stains or the like adhere to the float 114 and the guide pin 117, the buoyancy of the float 114 may be reduced, or the float 114 may be caught in the middle of ascending, and the prescribed water level cannot be secured, and the drive pump 111 continues to rotate. As a result, a situation may occur in which water continues to flow from the overflow 121st of the water level detection tank 105, and it is not desirable in terms of maintenance and management, such as requiring periodic cleaning.

Therefore, an object of the present invention is to provide a method for operating a wick water supply system which solves the above problems.

[0009]

In order to achieve the above object, according to the present invention, a control valve which is controlled to be openable and closable is "open" for a certain period of time, and water in a storage tank is introduced into a supply tank by a water level difference. After pumping, the air pump is turned on for a certain period of time, the water in the water supply tank is pumped into the water level detection tank connected to the wick water tank, and the extra water supplied during the on time is provided in the water level detection sensor. Drain from the overflow pipe provided and secure a constant water level in the wick water tank.

[0010]

According to such an operating method, the air pump is turned on for a certain period of time to feed the water in the water supply tank into the water level detection tank. As a result, water is supplied to the wick water supply tank, and the prescribed water level surface is secured.

In this case, since the water level control means is time control, the insufficient amount can be divided and supplied at regular intervals, so that it is possible to provide a finely tuned response and a large change in the water temperature. There is no. In addition, water can be replenished accurately without being affected by scales.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings of FIGS.
An embodiment of the present invention will be specifically described.

In FIG. 4, reference numeral 1 denotes a main body of the constant temperature and humidity chamber of the constant temperature and humidity chamber 3. The front surface of the constant temperature and humidity chamber body 1 is an opening / closing door 5 which can be opened and closed with one hinge as a fulcrum. .

In the main body 1 of the constant temperature and humidity chamber, a heating heater 13 and a humidifying heater for generating steam are provided in a passage 11 partitioned by a partition wall 9 including a fan 7 for stirring air in the main body. 15 and an evaporator 17 are respectively arranged, and the air in the main body passes through the humidifying heater 15-> evaporator 17-> heating heater 13 in that order by the rotation of the fan 7, and is conditioned and conditioned during the passage. Circulates in the body.

The heating heater 13, the humidifying heater 15, and the evaporator 17 are controlled by a command signal from the temperature / humidity controller 19. The temperature / humidity control unit 19 receives a signal from one of the dry-bulb temperature detecting end 21 and a signal from the other wet-bulb temperature detecting end 23 that manages the temperature and relative humidity in the main body, and inputs the signals. A command signal is output corresponding to the temperature and relative humidity based on the signal.

A wick 27 for sucking water from the wick water supply tank 25 is attached to the tip of the wet bulb temperature detecting end portion 23, and a lower end edge of the wick 27 is in contact with a bottom surface 29 of the wick water supply tank 25.

The wick 27 is made of a non-woven fabric that absorbs water well by a capillary tube. As shown in FIG. 3, the folded portion 27a of the wick 27 is provided with an insertion region 33 into which the wet bulb temperature detecting end portion 23 is inserted by heat welding 31 so that the wick 27 can be easily attached.

The wick water supply tank 25 is connected and communicated with the water level detection tank 39 through the upper and lower connecting pipes 35 and 37,
It has a vertically long closed cross section. As a result, a deeper water level surface E is secured as compared with the conventional wick water supply pipe.

An opening 41 into which the wick 27 is inserted is provided on the tip end side of the upper surface of the wick water supply tank 25, and the bottom surface 29 is inclined downward from the tip end toward the lower connecting pipe 37 side.

The water level detection tank 39 is formed in a box shape,
The upper part is closed by an upper lid 43. A water supply pipe 45 is provided at the upper lid 43 of the water level detection tank 39, and a drain pipe 47 and an overflow pipe 49 are provided at the bottom.

The water supply pipe 45 communicates with the water supply tank 53 via a pipe 51. The drain pipe 47 is the drain pipe 5
Water can be drained to the outside via the 5. The overflow pipe 49 rises upward, and the height H from the bottom surface to the tip of the overflow pipe 49 is a prescribed water level surface E that is accumulated in the wick water supply tank 25.

The lower end of the overflow pipe 49 communicates with a storage tank 59 to which water is replenished via a water supply pipe 57 via a pipe 61. The storage tank 59 communicates with the water supply tank 53 via the pipe 63, and the water level detection tank 39, the storage tank 59, and the water supply tank 53 are connected to the pipes 6 respectively.
A circulation cycle is formed through 1,63,51.

When the solenoid valve 69, which serves as a control valve, is "closed", the pump pressure from the air pump 67 constituting the wick water supply device 65 acts on the water supply tank 53, and the pump pressure causes water in the water supply tank 53 to flow. Is sent into the water level detection tank 39 through the water supply pipe 45. At the same time, a part of it returns to the storage tank 59.

Further, by opening the solenoid valve 69,
Since the water supply tank 53 is open to the atmosphere, the storage tank 5
The water from 9 comes into the water supply tank 53 due to the difference in water level.

The air pump 67 and the solenoid valve 69 are connected to the control unit 7
The operation is controlled by the signal from 1. The control unit 71 includes information about the initial water supply, the evaporation amount per unit time from the wick water supply tank 25 during the temperature and humidity control, and the air pump 6.
Information on the discharge amount per unit time of 7 is input in advance. In particular, during temperature / humidity control, for example, the solenoid valve 69 and the air pump 6 are divided into four parts every 15 minutes for a certain time.
7 to output a command signal. In this case, the ON time of the air pump 67 is set corresponding to the amount of evaporation per unit time, but as shown in FIG. 5, the overflow time t at which water slightly overflows is set.

Next, the operating method will be described based on the timing chart shown in FIG.

First, the main power switch is turned on from off. Next, the electromagnetic valve 69 is changed from “closed” to “open” for a certain period of time to open the inside of the water supply tank 53 to the atmosphere. As a result, the water in the storage tank 59 is fed into the water supply tank 53 due to the difference in water level, and the water supply tank 53 becomes full. After a certain period of time, the solenoid valve 69 is closed,
At the same time, the air pump 67 is turned on from off. During the ON time of the air pump 67, the water in the water supply tank 53 is sent into the water level detection tank 39. At the same time, a part of it returns to the inside of the storage tank 59. Next, when the initial water supply is completed, the air pump 67 is turned off. After that, the water in the wick water supply tank 25 is sucked up by the wick 27 and the temperature and humidity control is started. In this temperature / humidity control, after a lapse of a certain time, the electromagnetic valve 69 is opened, and the water in the storage tank 59 is fed into the water supply tank 53 with a water level difference. After a certain period of time, the electromagnetic valve 69 is closed and at the same time, the water in the water supply tank 53 is supplied into the water level detection tank 39 by the air pump 67. During this operation, the air pump 67 operates by dividing into four parts every 15 minutes to manage the prescribed water level surface.

In this case, the water is not replenished more than necessary, the temperature of the water in the wick water supply tank 25 is not abruptly changed, and the wet bulb temperature detecting end 23 is not adversely affected. Moreover, the on time of the air pump 67 is short, and the life can be extended.

Further, it is possible to supply water accurately without being affected by scale and the like when detecting the water level surface.

[0030]

As described above, according to the present invention, since the amount of water reduced by evaporation is replenished by the operating time of the air pump, the water can be replenished in a fine manner. Therefore, the temperature change width of the water due to the replenishment can be suppressed to a small level, so that the detection at the wet bulb temperature detection end is not adversely affected. In addition, it becomes possible to manage the water level surface accurately without being affected by scale and the like.

[Brief description of drawings]

FIG. 1 is an explanatory view showing the structures of a wick water supply tank and a wick water supply device of a thermo-hygrostat according to the present invention.

FIG. 2 is a perspective view of a wick water supply tank and a water level detection tank.

FIG. 3 is an explanatory diagram of a wick.

FIG. 4 is a schematic sectional side view of a thermo-hygrostat.

FIG. 5 is a time chart diagram.

FIG. 6 is an explanatory view showing structures of a conventional wick water supply pipe and a wick water supply device.

[Explanation of symbols]

 25 Wick Water Supply Tank 39 Water Level Detection Tank 49 Overflow Pipe 53 Water Supply Tank 59 Storage Tank 67 Air Pump 69 Electromagnetic Valve (Control Valve)

Claims (1)

[Claims] 1. An open / close control valve is opened for a certain period of time, water in the storage tank is fed into the water supply tank due to a water level difference, and then an air pump is turned on for a certain period of time.
Then, the water in the water supply tank is sent to the water level detection tank connected to the wick water supply tank, and the excess water that has been sent during the on-time is drained from the overflow pipe provided in the water level detection sensor. A method for operating a wick water supply device, characterized in that a constant water level surface is secured inside.