JPH04203714A - Device to stop filling to full in dehumidifier - Google Patents

Abstract

PURPOSE:To remove the float in a water receiving vessel and provide a stable device to stop filling to full of water by providing a metal plate in the water receiving vessel and sensing an increase in the electrostatic capacity between the metal plate and the dehumidification water to stop automatically the operation of a dehumidifier. CONSTITUTION:A dehumidifier sucks air from an air suction port 1, and when the air goes through a cooler 4, its temperature drops below the dew point temperature and condensate on a cooler 4, and the dehumidification water is led to a removable water receiving vessel 8 that is arranged below the dew receiving pan 7. As the time passes the water level rises. The fact that the water level reaches a specified water level is sensed by the increase in the electrostatic capacity between the metal plate 9 and the dehumidification water. Two pieces of metal plates are arranged perpendicularly to the water face, and the difference in electrostatic capacity between the metal plate and the earth is kept below a specified value. As the water face of the dehumidification water increases and rises, the electrostatic capacity between the metal plate 12 on the lower side and the earth through water becomes very large, and there is a large difference between this capacity and the electrostatic capacity between the upper metal plate 13 and the earth. When the difference of the electrostatic capacities becomes larger than a specified value, a stop signal is issued and the operation of the dehumidifier is stopped.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a full water stop device for a dehumidifier, and is a full water stop device that detects the water level in a water receiver without using a float that utilizes the buoyancy of water. It is related to.

[Conventional technology]

A conventional dehumidifier full-water stop device is, for example,
As described in Publication No. 50184, a float is installed in a water receiver, and when the water level rises, a microswitch is actuated from the float via a lever to stop the dehumidifier.

[Problem to be solved by the invention]

The above-mentioned prior art full-water stop has a structure in which a float is installed in the water receiver and its buoyancy operates the lever of the microswitch to stop the water, but the mechanism is complex and the mechanical movement causes locking accidents. There was a fear that

In addition, the float inside the water receiver has a poor appearance, and if the float is unstable when attached after emptying the water that has accumulated in the water receiver, the stability of the operation of the microswitch cannot be expected. There was a problem. Also, since the float was required to rotate with a very small amount of force, there were problems such as the float making rattling noises due to the vibration of the dehumidifier.

Furthermore, no consideration was given to customer handling and maintenance such as when cleaning the inside of the container.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the float in the water receiver and provide a stable full-water stop device in order to eliminate the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above purpose, as a means of sensing the water level,
This is achieved by utilizing the large capacitance of water and understanding changes in capacitance between the water and the metal plate as the water level rises.

[Effect]

The idea behind developing the present invention and the operation of the above technical means will be described below.

Conventional water level sensing using floats has many mechanical parts,
In particular, water receptors for dehumidifiers are handled by general customers, so
Dimensional errors in the signal transmission mechanism between the float and the microswitch were causing malfunctions in the water stop.

The full-water stop mechanism of the present invention focuses on this point, and eliminates the cause of malfunction by detecting the accumulated water itself without attaching any parts to the water receiver handled by the customer. It is.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 6.

FIG. 1 is a cross-sectional view of the entire structure including the full-water stop mechanism of a dehumidifier according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the full-water stop mechanism of FIG. 1, and FIG. Figure 2 is a diagram showing the full water stop mechanism in a different arrangement when viewed from the P direction, Figure 4 is a diagram showing the full water stop mechanism in which the metal plate in Figure 2 is divided into two upper and lower parts, and Figure 5 is the electrical connection for the full water stop. Circuit FIG. 6 is a diagram showing the relationship between the distance between the water receiver and the metal plate and the water stop level.

In Figure 1, 1 is an air inlet, 2 is an air outlet, and 3 is an air inlet.
is a compressor, 4 is a cooler, 5 is a reheater placed behind the cooler, 6 is a blower, 7 is a dew pan, 8 is a water receiver, 9 is a metal plate for water level sensing, 10.11 are each The presser spring is shown.

The dehumidifier shown in FIG. 1 sucks air through an air suction port 1, and when the air passes through a cooler 4, the temperature becomes below the dew point and condenses on the cooler 4. A removable water receiver 8 arranged at the bottom of the dew receiver 7
As time passes, the water level rises. Normally, when this water level reaches the specified water level at about 70% of the total internal volume of the water receiver 8, the operation of the dehumidifier is stopped, the water receiver 8 is removed from the dehumidifier, and the dehumidified water in the water receiver 8 is drained. After discarding it and setting the water receiver 8, restart the operation.

In this example, water reception@
It is sensed by the increase in capacitance between the dehumidified water and the metal plate 9 provided adjacent to the side surface of the dehumidified water.

As shown in Fig. 2, this capacitance is proportional to the dielectric constant of the object and the overlap area L between the metal plate 9 and the water level (L dimension is the width dimension of the metal plate) XT (this is constant), It is inversely proportional to the distance A between the water and the metal plate. Therefore, if the spacing A is kept uniform, the water level will rise and the lap distance T with water will increase, and the dielectric constant will be lower than that of the plastic material used for the air layer and the water receptor 8. With the large amount of water involved, the overall capacitance also increases significantly.

In order to put this difference in capacitance to practical use, two metal plates are arranged vertically to the water surface, as shown in Figure 4, in a vertical relationship.
In addition, by keeping the capacitance difference between the space and the ground below the specified value when there is no water, as the water surface of the dehumidifying water gradually increases from below and rises, the lower metal plate 12
, the lower metal plate 12 has a very large capacitance with the ground through water, and there is a large difference in capacitance between the upper metal plate 13 and the ground. When the difference in capacitance reaches a specified value or more, a stop signal is issued to stop the operation of the dehumidifier.

By configuring the areas of these two metal plates 12 and 13 to be approximately equal, even if an object with a large dielectric constant is placed near the dehumidifier, this object and each of the two metal plates 12 and 13 If the distances are the same, the capacitances between each metal plate, 12 and 13, and the ground via this object will be similarly large and no difference will occur.

Therefore, there is no possibility that an object outside the dehumidifier will cause a full water detection.

Furthermore, by configuring the shape of the metal plate 12 on the lower side of the two metal plates 12 and 13 so that the horizontal dimension is larger than the vertical dimension, the area between the metal plate 12 and the adjacent water can be reduced in response to changes in the water level of dehumidifying water. can be increased, allowing for large changes in capacitance. This makes it possible to suppress variations in the detection of the full water level.

Hereinafter, the operation of the electric signal will be explained using the electric circuit diagram shown in FIG.

An astable multivibrator is constructed using a NOR gate IC, and a trigger pulse is input to six inputs of the monostable multivibrator IC.

The operation of the monostable multivibrator IC is such that when a trigger pulse is input to the A input, the output Q becomes L-+H at the rising edge of the input, and then returns to L. The pulse width Pw of this Q output is Pw
=RxXCx. Unit Pw: (Sec), R
x: CΩ], CW: (F) Output Q becomes an output pulse opposite to Q. This IC has two built-in monostable multivibrator circuits. When the trigger pulse from the NOR gate IC is input to two monostable multivibrator circuits simultaneously, the capacitance Cx between the metal plate and the ground
A pulse width Pw determined by the product of
The two outputs are input to the NOR gate IC. If the product of Cx and Rx is equal for the two monostable multivibrators, the pulse widths of Q and Q are equal, and if the output from the NOR gate IC remains L, the pulse width from Q is greater than the pulse width from Q. becomes larger, and an output H is output to the 0 part of the NOR gate IC for the time corresponding to the difference.

This output operates the transistor Q201 to generate an output voltage at the 0 section. Therefore, when dehumidified water approaches the metal plate 9b, Cx2 increases, and the voltage at part 0 increases.
The microcomputer determines when the temperature exceeds the specified value and stops the dehumidifier.

Regarding the above operation, the change in the capacitance value due to the change in the distance A between the metal plate 9 and the water receptor 8, which is the cause of the change in capacitance, becomes the value shown in Fig. 6, which ensures reliable operation. In order to do this, it is preferable that the large dimensions be as small as possible and have little variation.

In the present invention, this distance A is solved by bringing the side surface of the water receiver 8 and the metal plate 9 into close contact with each other.

That is, as shown in FIG. 2, if the supporting part of the metal plate 9 is made to be movable in the front-back direction and the metal plate 9 is supported by a spring 10, it is possible to ensure that the water receptor is in close contact with the inserted state. .

In addition, as a different example, as shown in FIG. 3, a metal plate 9
is fixed and installed, and the presser spring 1 is attached to the opposite side of the water receiver 8.
1 may be provided and the water receiver 8 may be pressed against the metal plate 9 in close contact.

〔Effect of the invention〕

The full water stop device according to the present invention uses electrical detection to detect an increase in the amount of water, instead of the conventional mechanical movement that detects the increase in water volume. It is something that stabilizes.

In addition, the second, third, and fourth claims provide specific means for further increasing the detection accuracy, and the second claim provides a method for ensuring the gap size, which is a factor in capacitance fluctuation. , the third term uses two detection plates and uses a comparison method to detect the difference between the two plates, thereby making it possible to absorb errors in absolute values.

By applying each of the above items, it is possible to provide a more accurate full-water stop device.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the structure of a full-water stop device of a dehumidifier according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view showing the full-water stop mechanism of Fig. 1, and Fig. 3 is a different arrangement of the full-water stop. Diagram showing the mechanism. Figure 4 is a diagram showing the full water stop mechanism in which the metal plate in Figure 2 is divided into upper and lower parts, Figure 5 is an electrical circuit diagram for the full water stop, and Figure 6 is the gap between the water receiver and the metal plate and the full water stop. It is a diagram showing the relationship between water levels. 1... Air intake port, 2... Air discharge port, 3
... Compressor, 4... Cooler. 5... Reheater, 6... Blower, 7...
Dew saucer, 8-...Water receiver. 9... Metal plate for water level sensing, 10.11... Presser spring, 12... Lower metal plate, 13... Upper metal plate. Figure 1 Takabun Figure 3 (2) Figure 5

Claims (1)

[Scope of Claims] 1. A water receiver for receiving and storing dehumidified water is removably provided in the cabinet, and when the water level of the dehumidified water accumulated in the water receiver reaches a specified water level, the dehumidifier is operated. A full water stop device that automatically stops the operation of the dehumidifier has a metal plate installed inside the water receiver, and detects an increase in capacitance between the metal plate and the dehumidified water and automatically stops the operation of the dehumidifier. A full water stop device for a dehumidifier, which is characterized by: 2. A full water stop device for a dehumidifier as set forth in claim 1, wherein the metal plate or the water receptor is movable and is pressed by a spring so that adjacent surfaces thereof come into contact with each other. 3. In the dehumidifier described in claim 1, the metal plate is separated into two upper and lower parts, and the dehumidifier is structured to sense the difference in capacitance between the two metal plates and the dehumidified water. Full water stop device. 4. In the thing described in claim 3, the upper and lower 2
A full water stop device for a dehumidifier in which the areas of the separated metal plates are approximately equal and the shape of the lower metal plate is larger in horizontal dimension than vertical dimension.