JPH0342707Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is a liquid that expels liquid such as water that has entered the inside of a waterproof case or cover of electrical equipment in, for example, agricultural machinery used outdoors. Regarding the punching structure.

<Conventional technology> Generally, various electrical components and wiring parts installed in machinery that are exposed to rain and dew are equipped with waterproof cases and covers to prevent the internal electrical components from being directly exposed to rain and dew. , and those that also have dustproof properties are known.

<Problems to be solved by the invention> However, with conventional waterproof and dustproof case waterproof structures and simple waterproof structures, due to wiring issues, structural conditions of the case mounting position, cost issues, etc. However, it does not have complete internal airtightness, and depending on the type of electrical equipment, it may be necessary to have a certain degree of ventilation with the outside of the case, so it may be necessary to provide a small air vent hole, etc. It was hot.

For this reason, with conventional waterproof cases, condensation may occur inside the case due to sudden changes in the temperature of the relevant part during or after use of the machine, or negative pressure may occur within the case due to car wash water, rainwater, etc.
There were drawbacks such as water being sucked into the interior and the water accumulating inside, leading to leakage of electrical components and deterioration of performance due to corrosion.

<Means for solving the problem> In order to solve the above-mentioned problems, the liquid drain structure of the present invention forms a liquid drain hole in a part of the case that has a waterproof structure, and A liquid draining member made of a bundle of a large number of water-resistant linear, filamentous, or fibrous water-permeable members is inserted, one end of the liquid draining member is exposed inside the case, and the other end is exposed inside the case. It is characterized by a structure in which the liquid such as water inside the case is discharged to the outside by the capillary action of the liquid draining member, by facing the outside of the case.

<Function> Even if moisture or the like spills onto the outside of the case 4, the liquid (water) drain member 7 is inserted into the liquid (water) drain hole 5, so that moisture or the like is prevented from entering the inside. Even if the liquid (water) enters the liquid (water), it is guided to the outside by the capillary action of the liquid (water) draining member 7 and drips or evaporates, and the moisture inside is naturally discharged to the outside.

〈Example〉 The drawings show an example of the present invention, and Fig. 1 shows the mounting structure of the microcomputer, and shows the board 2 attached to the fuselage 1 side.
A microcomputer 3 is attached to the machine, and a waterproof case 4 that also serves as dustproof is attached to the body 1 so as to cover the microcomputer 3 around its outer periphery.

The waterproof case 4 has a box shape, and has a water drain hole 5 formed in its bottom, through which a water drain member 7 bundled in the form of a string is inserted through a cylindrical socket 6.
The water draining member 7 is made of glass fibers, synthetic fibers, or other water-resistant threads or wires bundled into a string shape, and has water permeability, and its inner end is in contact with the inner bottom surface of the waterproof case 4. It appears inside the case. The other end protrudes from the lower end of the socket 6 and is exposed to the atmosphere.

Due to the above mechanism, if water enters or accumulates inside the waterproof case 4 for some reason, the tip of the water draining member 7 is impregnated, and the water reaches the externally protruding end of the water draining member 7 due to capillary action and flows downward. drip onto the
Otherwise, it will naturally evaporate and all the water inside will be drained outside. Furthermore, when there is no moisture in the waterproof case 4 and no moisture is contained in the drain member 7, the inside and outside of the waterproof case 4 are communicated with each other through the drain hole 5 and the drain member 7, and there is a certain degree of breathability. This prevents inconveniences such as the generation of internal negative pressure and condensation due to sudden changes in temperature, and since the drain hole 5 is blocked by the drain member 7, water during car washing, rainwater, etc. A large amount of water will not enter the interior.

FIG. 2 shows another embodiment of the present invention. In this example, electrical components 9 such as a switch and a pilot lamp are attached to the surface of a plate-like member of the aircraft body 1, and the back surface of each electrical component is mounted on the surface of the plate-like member of the aircraft body 1. A waterproof case 4 is attached to cover each wiring 10, and a drain hole 5 is formed at the bottom of the waterproof case 4, and a bush-shaped socket 6 is fitted into the drain hole 5. .

A coated cord 11 that integrates the wiring 10 is inserted into the socket 6, and between the cord 11 and the inner surface of the socket 6, a cylindrical bundle of the same material as described above is inserted. A water draining member 7 is inserted. The inner end of the water draining member 7 protrudes and is exposed from the inner bottom surface of the waterproof case 4, and the outer end thereof protrudes from the outer bottom surface of the waterproof case 4 and is exposed to the atmosphere while covering the outer periphery of the cord 11. Its peripheral surface and ends are exposed.

The above mechanism has the same functions as the case shown in FIG. 1, such as internal drainage, internal and external ventilation, and prevention of large amounts of water from entering from the outside.

Fig. 3 shows an example in which the liquid contained in the residual fuel of a carburetor of a gasoline engine, etc., which is particularly low in volatility, is discharged by utilizing the capillary phenomenon in the above-mentioned embodiment. A resin case 23 made of a transparent member constituting the chamber 22 is attached to the lower opening of the main body 21 , and a core boss 24 protrudes downward from the center of the chamber 22 at the center of the main body 21 . is the sleeve-shaped main jet 2
5, the case 23 is fastened.

A vaporized fuel supply passage 26 is formed in the main body 21, and a slow pipe 27 is inserted into the core boss 24 from above the main body 21 through the supply passage 26, and a slow jet 28 is formed at the lower end of the slow pipe 27. , the fuel introduced from inside the chamber 22 is vaporized and sent to the accelerator section through the supply path 26. Reference numeral 29 denotes an adjuster screw formed in the upper part of the main body 21 toward the upper part of the slow pipe 27. A float 31 having a C shape in plan view is floated in the chamber 22 and is raised and lowered by the buoyancy of the fuel 30. The float 31 has one end rotatably attached to the float side within the chamber 22 by a float pin 32. It is pivoted.

On the other hand, a fuel supply passage 33 for introducing fuel into the chamber 22 is formed at right angles above the float pin 32, the open end of the horizontal part forms a connection end 34 with a hose (not shown), and the vertical part The lower end opens into the chamber 22, and the opening has a float valve 3 which is opened and closed by raising and lowering the float 31.
5 is provided.

A rod-shaped valve 36 whose circuit is closed when fuel is not in use is provided in the horizontal oil supply path 33 so as to be able to move up and down in the vertical direction. 39 is attached, and the diaphragm chamber 37
are partitioned by diaphragms 38 and 39, and the lower diaphragm 39 is always urged upward from below by a spring 40 in the diaphragm chamber 37, but when the engine is running, the negative pressure applied through the negative pressure joint 41 The diaphragm 39 is bent downward against the spring 40, and the valve 36 opens the oil supply passage 33.

Above the valve 36 is a manual pump lever 4.
2 is attached, and at the time of starting with no fuel in the chamber 22, the manual pump lever 42 is manually operated to supply fuel into the chamber 22 in advance.

An air vent hole 44 whose lower end opens in the chamber 22 is formed on the opposite side of the main body 21 from the oil supply passage 33, and whose upper end is bent toward the outer circumferential side of the main body 21 and opens downward. A string-like liquid draining member 45 impregnated with a liquid such as gasoline is inserted into the air vent hole 44, and the outer end of the liquid draining member 45 projects outside the main body 21 from the air vent hole 44, and the inner end is connected to the chamber 21. Inside the chamber 22, the liquid draining member 45 is covered with a covered pipe 46 that is not impregnated with liquid, and its lower end is exposed in the fuel inside the chamber 22.

The liquid draining member 45 is made of a large number of thread-like, fibrous, or linear members made of a material that is not corroded by the fuel inside the chamber 22, and is made of a material that can be impregnated with fuel, and automatically impregnates the fuel inside the chamber 22 by capillary action. It drips or evaporates to the outside. In particular, after using the engine, among the gasoline remaining in the chamber 22, the non-volatile substances that have accumulated at the bottom of the chamber are automatically discharged to the outside, and even after long-term storage, the remaining fuel will prevent the next engine start. It has the effect of preventing

<Effects of the invention> According to the invention constructed as described above, the liquid that accumulates inside the waterproof case and has a harmful effect on equipment is naturally drained to the outside by the draining member, and the accumulated liquid is removed. As a result, deterioration in functionality or damage to equipment is prevented.

Particularly in the case of electrical equipment cases, large amounts of moisture are prevented from entering the waterproof case as much as possible, and even if moisture does get in, the liquid (water) is drained out naturally through the drainage member, and the water is waterproof. This has the advantage that constant ventilation is maintained between the inside and outside of the case, and temperature differences between the inside and outside are less likely to occur.

[Brief explanation of the drawing]

1 and 2 are a cross-sectional perspective view and a cross-sectional view of electrical components of machinery, both showing different embodiments of the present invention,
FIG. 3 is a sectional view when the principle of the present invention is applied to a carburetor for fuel supply. 4: Case, 5: Liquid (water) drain hole, 7: Liquid (water) drain member.

Claims (1)

[Scope of utility model registration request] A drain hole is formed in a part of the case that has a waterproof structure, and a drain member made of a bundle of a large number of water-resistant linear, filamentous, or fibrous water-permeable members is inserted into the drain hole. and a structure in which one end of the liquid draining member is exposed inside the case, and the other end is exposed to the outside of the case, so that liquid such as water inside the case is discharged to the outside by capillary action of the liquid draining member. Water-repellent structure of the waterproof case.