JPS5843051B2 - Insecticidal liquid evaporation device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an insecticidal liquid evaporation device, particularly during the mosquito active period of the day and night, that is, from evening to early morning, and at an illuminance that substantially coincides with the mosquito active period of the day. The present invention relates to a transpiration device that electrically detects a period of time when the amount of insecticide decreases and automatically evaporates an insecticidal liquid during the period.

Various methods have been proposed for bringing the insecticide into contact with a heating element and evaporating the insecticide continuously over a long period of time.Among them, a mat-type electric mosquito trap is a typical example of an insecticide evaporation device.

In this mosquito repellent, a thick pulp mat is impregnated with insecticide, and this is placed on a hot plate to evaporate the insecticidal ingredients by heating.
There is a time limit of 9 hours, and when transpiring insecticides by heating, a large amount of the insecticidal ingredient evaporates in the initial stage, and the amount of transpiration cannot be uniform, and the evaporation time is limited to 9 hours. The insecticidal components change due to thermal decomposition caused by heating the mat, and it is technically impossible for the components in the mat to evaporate completely, and in fact, it is said that 40% of the components remain in the mat.

Even the mat-type electric mosquito repellent that is currently most commonly used has the above-mentioned drawbacks, and a means for efficiently evaporating insecticides is desired.

This invention eliminates the atmosphere generated within the container by automatically heating the liquid agent stored in the container only during the hours of the day when the illuminance is low, which approximately coincides with the active hours of mosquitoes. The present invention provides an efficient evaporation device that does not waste liquid by continuously supplying an appropriate amount of liquid from a container onto a heating evaporation plate via a supply pipe by utilizing the expansion pressure of the contained material.

Mosquitocides used in this invention can be used in a wide range of liquid forms as long as they can be dissolved in a solvent. Examples of insecticides include Allethrin (generic name) manufactured by Sumitomo Chemical Co., Ltd. An insecticidal solution prepared by dissolving (trade name) in a solvent is stored in a heat-resistant and sufficiently elastic airtight container with sufficient air, and the container is exposed to air during mosquito activity hours, i.e. during the day. Electrically and automatically heated only during a certain period of time when the illuminance is low.

As a result, the volume of the insecticidal liquid containing the air inside the sealed container expands, and the contents that increase the pressure are placed on a transpiration sheet that has one end placed at the bottom of the container, the other end connected to the nozzle part, and the other end placed on the heating element. A portion of the insecticidal liquid is introduced into the pipe and dripped onto the transpiration sheet through a small-diameter supply pipe placed oppositely above.

The liquid spread on the sheet is heated by a photocell (photoconductive cell) that electrically detects the decrease in illuminance during the day, automatically closes an electric circuit, and is heated by an energized electric heating element. , the insecticidal liquid continues to evaporate during the period of time when the illuminance detected by the photocell is reduced, which approximately coincides with the period of mosquito activity.

Then, at dawn, a photocell electrically detects the rise in illuminance that occurs at the end of the mosquito's active period, opens the closed electrical circuit, stops the heating work of the heating element, and stops the transpiration of the insecticide. Therefore, mosquito extermination work can be carried out automatically according to the mosquito activity time without any human intervention.

In this invention, the liquid agent to be evaporated can be reliably evaporated little by little as it is dropped onto the evaporation sheet, so the liquid agent will not be subject to thermal changes over a long period of time, so it will be effective and uniform. The effect can be sustained over a long period of time, and when the heating element for liquid agent evaporation is used as the heat source for heating the closed container, economical effects are produced, and the evaporation means can also be simplified.

Furthermore, the amount of heating of the container can be easily adjusted by increasing the amount of ventilation around the container, thereby making it possible to easily control the amount of liquid agent dripped and to prevent wasteful use of expensive liquid agents.

In addition, when a large amount of air is intentionally contained in a sealed container along with a liquid agent, a gas having a large expansion coefficient can be actively used to precisely control the increase or decrease in the amount of liquid agent discharged from the container. The evaporation of the liquid can be stopped by stopping the heating to the container, and as the container cools, the pressure inside the container becomes low, allowing the residual liquid remaining in the supply pipe to easily flow back into the container using the pressure difference. Therefore, expensive liquids can be reused without wastage, and the supply pipe can be cleaned at the same time as the liquid is refluxed, ensuring comfortable use over a long period of time without the risk of pipe clogging. Since this method utilizes the internal pressure of the container to discharge the liquid under pressure, even a relatively highly viscous liquid can be reliably discharged, and the transpiration work is not hindered by the type of liquid.

Next, a specific example of the insecticide evaporation device according to the present invention will be explained using the drawings.

An insulating chamber 2 is sectioned at the bottom of the casing 1, and the insulating chamber 2 includes an airtight container 4 containing a liquid agent 3 together with air.
It is removably attached via a screw-shaped retainer 5 formed on the back side of the ceiling that forms part of the insulating room 2, and the airtight container 4 is opened at the bottom of the casing by opening the bottom plate 6 of the insulating room 2. Replacement work is carried out from the open part,
Also, cold air is introduced through the opening to adjust the temperature of the container.

Further, an electric heating element 7 is installed close to the above-mentioned insulating room 2, and on the heating element γ there is placed a saucer with good heat conduction, for example, a tray made of aluminum plate 8 and a pulp board or rock wool etc. A transpiration tray 10 on which a thin transpiration sheet 9 is laid is placed in an open state on the upper surface of the casing 1 with an insulating plate 11 in between.

A small-diameter liquid agent supply pipe 12 is connected between the closed container 4 and the transpiration tray 10, that is, the inclined bottom 4 of the closed container 4
One end of the pipe 12 is inserted into the deepest part of the container formed by a, and the tip nozzle part 12 of the pipe extends from the container 4.
Piping a is installed directly above the transpiration tray 10.

As the heating element 1, a heater using a semiconductor, including a battery, whose heat generation temperature is highly stable when energized, is suitable for this type of device, and a photocell is included in the electric circuit connecting the heating element and the power source. (Photoconductive cell) switch device 13
The device 13 is housed in the casing 1, and a window 14 is provided particularly in a portion corresponding to the photocell portion of the casing 1. An illumination adjustment plate 15 is attached to the window 14 to adjust the opening amount of the window. It is configured to be controllable with an adjustment plate.

Reference numeral 16 denotes an indicator lamp that indicates the current status of the heating element.

A closed container 4 containing a predetermined amount of liquid is set in the casing 1 via a screw-shaped retainer 5.

When the photocell senses a decrease in illuminance (light intensity) nearing evening when mosquitoes are active, the resistance value of the photocell decreases and the electric circuit between the electric heating element 7 and the power source is closed and the heating element is turned off. The heat generation work is started and the indicator lamp 16 is also turned on.

The radiant heat emitted from the heating element gradually warms the container 4 placed close to the heating element.

The contents in the container, that is, the liquid agent and the atmosphere, expanded, a particularly large expansion pressure was applied to the liquid agent, the liquid agent was introduced into the supply pipe 12, and an appropriate amount of the liquid agent was preheated from the tip nozzle portion 12a of the pipe. The liquid agent dropped onto the evaporation sheet 9 continues to evaporate.

This transpiration process continues as long as the photocell detects the low illuminance state, the resistance of the photocell decreases, and the electrical circuit is closed.The photocell detects this situation in the morning, when the mosquito activity decreases, and the photocell When the resistance of the cell increases, the heating element 7
The electrical circuit to is opened and the heating element stops generating heat, and the evaporation of the liquid agent also automatically stops accordingly.

Please note that depending on the location where this device is installed or the usage conditions in each home, the brightness of the room may vary and the operating time of the photocell may vary. The amount of expansion is controlled by an adjustment plate, and consideration has been given to being able to respond to various conditions at the installation location of the device.

In this way, this device automatically starts evaporating the liquid in the evening when mosquitoes are active, and this process continues during mosquito activity hours, and then stops as the mosquito activity time elapses. This eliminates the trouble of exterminating mosquitoes, and also prevents unnecessary consumption of expensive chemicals due to forgetting to stop the device.

In this invention, the heating element for liquid agent evaporation is used as a heat source for heating the airtight container, which is an essential component of this device, so that the device itself is mechanically simplified and miniaturized. The system employs a method in which the liquid is discharged using the expansion pressure generated by heating the contents in the sealed container, making the dispensing operation of the liquid reliable, and making it possible to drip an appropriate amount of liquid even with particularly high viscosity. It is possible to provide a device with a wide range of application for various liquid agents.

Also, the chamber wall (bottom plate) that constitutes a part of the storage room that houses the containers.
The pressure inside the sealed container can be easily controlled by allowing outside air to be introduced into the insulating chamber and controlling the amount of heating in the sealed container.This allows the amount of liquid dripping from the supply pipe to be easily controlled and always at the appropriate amount. This has the effect of allowing continuous evaporation of the liquid agent.

[Brief explanation of drawings]

FIG. 1 is a plan view of a transpiration device for carrying out this invention;
FIG. 2 is a sectional view taken along line A--A in FIG. 1. In the figure, 1 is a casing, 2 is a storage room, 3 is an insecticidal liquid, 4 is a sealed container, 6 is a bottom plate, 7 is an electric heating element, 9 is a transpiration sheet, 10 is a saucer for liquid evaporation, 12 is a supply pipe, 13 is a photocell switch, 14 is a window, and 15 is an illuminance adjustment plate.

Claims (1)

[Claims] 1. An insulating chamber is formed within the casing, and the insulating chamber has a part of the wall that can be opened and closed to allow outside air to be introduced, and a sealed container containing an insecticidal liquid with sufficient atmosphere is removably attached to the insulating chamber. Attachment, arranging an electric heating element on which a transpiration sheet is placed on the upper surface of the container, disposing the electric heating element close to the container, connecting the tip of a supply pipe extending from the container to the upper part of the transpiration sheet, and energizing the electric heating element. An insecticidal liquid evaporation device having an illuminance sensing photocell switch housed in the casing and located on an illuminance adjustment plate attached to the casing in the circuit.