JPS61133703A - Dry air filling device - Google Patents

Abstract

PURPOSE:To attain long range unattended operation and stable operation with simple structure by providing a case sealing a chemical substance absorbing water content in high humidity air at its contact and evaporating its water content into air when in contact with low humidity air. CONSTITUTION:When the temperature of a feeding device 1 and a feeding line 3 rises with sunray incidence or ambient temperature rise, a part of dry air is exhausted externally through a pipe 5, a case 10 and an exhaust outlet 11 because of expansion of the internal air. In this case, the water absorbing chemical substance 6 loses its water content through evaporation externally. As a result, the water content of the chemical substance 6 is decreased. When air temperature falls down at night, the air in the feeding device 1 and the feeder 3 is condensed and external air is absorbed from the exhaust outlet 11 via the reverse path. As a result, dry air is supplied in the inside of the feeding device 1 and the feeder 3. Most of the water content is absorbed by the chemical substance 6 by repeating the temperature cycle like this and kept in the case 10 and does not invade in the inside of the waveguide.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is useful for maintaining the dryness of a space that is continuously filled with dry air over a long period of time, such as a power supply device or a power supply line in an antenna device. The present invention relates to a dry air filling device used.

(Prior art and problems to be solved by the invention) In antenna devices used in power-saving wireless relay stations and satellite communication earth stations installed in remote areas, power supply devices and waveguide power lines Due to the difficulty of obtaining an energy source to drive an air pump, etc., a dry air filling device (-), which is used to keep the internal air dry and in good condition, is required to operate without a power source. Sometimes.

As a dry air filling device for this purpose, there is a type that uses a desiccant to dry the air by utilizing the expansion and contraction of air due to temperature changes in the power supply line.

FIG. 3 is a block diagram of this conventional dry air filling device.

In the figure, 1 is a power supply device, 3 is a power supply line, 5 is an air pipe, 7 is a desiccant agent such as silica gel, 8 is a desiccant container, 9 is a transceiver, 12 antenna devices, 14 is an exhaust valve, and 17 is an intake valve. It is. Now, with the discharge valve 14 and the suction valve 17 closed, the power supply device IJP
When the temperature of the power supply line 3 rises, the air inside it is warmed and the pressure of the trapped air tends to rise. At this time, the discharge valve 14 opens in response to the rise in pressure, so
Some of the internal air is released outside. On the other hand, at night, etc. 1: When the outside temperature drops and the power supply device 1 and the power supply line 3 are cooled down, the air pressure inside them tends to decrease. At this time, the suction valve 17 opens while the discharge valve 14 remains closed:
: When left open, external air is sucked into the power supply line 3 from the suction valve 17 via the desiccant container 8 and the air pipe 5. At this time, moisture is absorbed by the desiccant 7 and dry air is fed. In this way, dry air is circulated within the power supply line 3 by utilizing the expansion and contraction of air due to the daily temperature difference of -1, but it has the following drawbacks: The desiccant 7 is consumed because it is a type of open circuit that releases dry air when expanding and sucks in external moist air when deflated, which is repeated at least once a day. There was a problem that it was severe and unsuitable for long-term unmanned operation.

As another example that improves the drawbacks of the conventional example shown in FIG. 3, there is also a dry air filling device of the type shown schematically in FIG. In the figure, 15 is a pressure adjustment bag made of an elastic rubber bag or the like or a gas cylinder, which is connected to the power supply device 1 through the connection port 4. It constitutes a circuit (closed circuit). Reference numeral 2 denotes an airtight cover that covers the opening of the power supply device 1 . Due to this structure, the expansion of air inside the power supply device 1 is absorbed by the expansion of the pressure adjustment bag 15, and the internal pressure is kept almost constant (
-Kept. However, such conventional examples have the following drawbacks.

First, the pressure adjustment bag 15 with high elasticity is required in order to absorb the large daily and annual differences caused by expansion and contraction of air. For example, if the air volume of the power supply line 3 or power supply device 1 is 200j
If the yearly change in temperature is 50 degrees Celsius, the pressure adjustment bag 15 must be able to change its volume from 0 to more than 30 degrees. is difficult to obtain. In addition, a part of the airtight cover 2, the power supply line 3, or a part of the pressure adjustment bag 15 C
- If a very small air leakage hole occurs, the balance of the closed air circuit will be disrupted, and not only will air leak when there is positive pressure when the temperature rises, but there is also a risk of negative pressure (C) occurring when the temperature drops. At the time of this negative pressure, external moist air will be sucked into the power supply line 3. If moisture accumulates inside the power supply line 3, exceeding the absorption capacity of the desiccant 7, (:
As the temperature drops, condensation forms on the inner surface of the waveguide, causing attenuation of transmitted power and rusting, which can seriously affect communication functions and quality.

Therefore, based on the above considerations, the purpose of this invention is to
Our goal is to provide a dry air filling device that has a simple structure, yet can operate unattended and stably for long periods of time.

(Means for Solving the Problems) In order to solve the above-mentioned problems (1) the dry air filling device provided by the present invention absorbs moisture in the air when it comes into contact with high humidity air, and absorbs moisture from the low humidity air (1). It is equipped with a container containing a chemical that evaporates the moisture contained in the air when it comes into contact with it.
The container is provided with a first air port that opens to the outside air and a second air port that opens to the dry air filling space, and the chemical substance is interposed between the first and second air ports. characterized by something.

(Function) The dry air filling device of the present invention uses a chemical substance that has a remarkable property of absorbing or dissipating moisture depending on the humidity of the air passing through, and is supplied to a dry air filling space such as inside a power supply line. This method increases the dryness of the air and prevents condensation inside. The chemical substance referred to here is, for example, a type of starch that has been chemically treated, and when it comes into contact with humid air or moisture, it absorbs water several times its own volume and expands. It also has the property of evaporating the moisture held inside when it comes into contact with dry air.

(Example) Next, the present invention will be explained in detail. FIG. 1 is a schematic perspective view showing a first embodiment of the present invention.

In the figure, 6 is the aforementioned chemical substance that easily adsorbs and evaporates moisture, and is placed in a container 10 having two holes. One hole of the container 10 is connected to the outside air through the exhaust hole 11, and the other hole is connected to the inside of the power supply line 3 via the air vibrator 5. Assume that there is already dry air inside 3.Increase in solar radiation and outside temperature C: When the temperature of the power supply device 1 and the power supply line 3 increases, the air inside expands and becomes dry. Part of the air is pipe 5, container 1
0 and is discharged to the outside via the outlet 11.

At this time, the action is performed to evaporate water from the water-absorbing chemical substance 6 and transport it to the outside. As a result, the water content of chemical substance 6 decreases. Next, when the temperature drops at night, the air inside the power supply device 1 and the power supply line 3 contracts, and the outside air is sucked in from the exhaust port 11 through the reverse path. At this time, the chemical substance 6 absorbs most of the moisture that tends to condense as the relative humidity increases due to the decrease in temperature. As a result, dry air is supplied to the inside of the power supply device 1 and the power supply line 3. By repeating such a temperature cycle, most of the moisture is absorbed by the chemical 6:- into the container 10.
The inside C2 of the waveguide hardly penetrates. As a result, even if the outside temperature drops, dew condensation within the waveguide can be prevented, and there is no need to replace the desiccant as in the conventional example shown in FIG.

FIG. 2 is a schematic perspective view showing a second embodiment of the present invention, in which a container 8 containing the desiccant 7 described above and a container 10 containing six chemical substances are connected in series. Two electric wires 3 (2 wires are used. Because of this 5 structure, the air whose moisture content has been reduced by the chemical substances in the container 10 is further connected to the desiccant 7 (
:Therefore, it is dried and supplied into the power supply line 3. Therefore,
If this embodiment is used, the dryness of the air inside the waveguide can be increased compared to the embodiment shown in FIG. Increase the frequency of agent replacement. In other words, the period during which unmanned operation can be performed can be extended.

(Effects of the Invention) As stated above (-1) According to the present invention, it is possible to prevent dew condensation inside the waveguide without using power such as a power supply, and it is possible to prevent condensation semi-permanently without the need to replace the desiccant. Also, since it is an open circuit, a closed circuit (fourth
As shown in the example in the figure, there is no disadvantage that a small air hole can cause a serious problem, and the simple structure with no moving parts has the advantage that a highly reliable dry air filling device can be manufactured at low cost. .

Furthermore, by using it in combination with a conventionally used method using a desiccant, a higher degree of dryness and long-term unmanned operation can be achieved. Although the load was a waveguide such as a power supply device or a power supply line, it may be anything that avoids condensation and requires dry air, such as a communication transmitter, receiver, or distribution board.

As described above, according to the present invention, it is possible to provide a dry air filling device that has a simple structure, can be operated unattended for a long period of time, and operates stably.

[Brief explanation of the drawing]

1 and 2 are schematic perspective views showing the first and second embodiments of the present invention, respectively, FIG. 3 is a configuration diagram showing a conventional open circuit dry air filling device, and FIG. 4 is a schematic perspective view showing the first and second embodiments of the present invention, respectively. FIG. 1 is a schematic diagram showing a conventional closed circuit type dry air filling device. 1... Power feeding device, 2... Cover, 3... Power feeding line,
4... Connection port, 5... Air pipe, 6... Chemical substance, 7... Desiccant, Death... Desiccant container, 9... Delivery
Receiver, 10...Chemical substance container, 11...Discharge port,
12... Antenna device, 14-... Discharge valve, 15...
・Pressure adjustment bag or gas cylinder, 17... Suction valve. Figure 1 Figure 2 Figure 3 Figure 1 Figure 4

Claims (2)

[Claims] (1) A container is equipped with a chemical substance that absorbs moisture in the air when it comes into contact with high-humidity air and evaporates the moisture contained in the air when it comes into contact with low-humidity air, and the container is open to the outside air. The first air vent and the second opening into the dry air filling space.
a dry air filling device, wherein the chemical substance is interposed between the first and second air ports. (2) The dry air filling device according to claim 1, wherein the dry air filling space and the second air port are connected through a container containing a desiccant.