JPH0736119Y2 - Vaporizer drain device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drain device for a carburetor that extracts fuel stored in a float chamber of the carburetor.

[Conventional technology]

Generally, in outboard motors, mowers, etc., the operator transports the engine, but during this transportation, fuel may leak from the float chamber of the carburetor installed in the engine to the outside. Conventionally, there has been proposed a drain device including a drain passage and a valve for opening and closing the passage so that the stored fuel can be extracted at any time.

For example, it is shown in Japanese Utility Model Publication No. 54-82228 or Japanese Utility Model Publication No. 52-57129.

[Problems to be solved by the device]

According to such a conventional drain device for a carburetor, an on-off valve for opening and closing the drain passage, a spring for holding the on-off valve in a closed state, an operating rod for operating the on-off valve, and the like require special parts. As a result, the number of parts is increased and the number of assembling steps is increased, resulting in high product cost, which is not preferable.

[Means for Solving the Problem] A vaporizer drain device according to the present invention is to provide an inexpensive vaporizer drain device with a small number of parts and assembly steps. A cylindrical drain boss provided with a bottomed drain hole that opens to the bottom of the float chamber is provided on the outer side of the main body so as to project therefrom, and is further opposed to each other substantially at right angles to the longitudinal axis Y-Y of the drain boss. A through hole penetrating through the drain hole is formed on the outer peripheral side of the drain boss, and an operating rod having an axial length substantially the same as the outer diameter of the drain boss is movably arranged in the through hole.
On the outer peripheral side of the drain boss, a tubular drain pipe made of an elastic material that closes at least the through hole is fitted and arranged, and at least either one of the through holes has a pressing protrusion formed on the outer periphery of the drain pipe. It is a thing.

[Action]

When the fuel is discharged from the float chamber, the pressing projection of the drain pipe is pressed toward the inside of the drain boss to move the operating rod to open the other through hole on the inner peripheral surface of the drain pipe and to drain the drain boss. A gap h communicating with the atmosphere is formed between the outer peripheral side of the drain pipe and the inner peripheral surface of the drain pipe to discharge the fuel in the float chamber to the atmosphere.

〔Example〕

An embodiment of the vaporizer drain device according to the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a carburetor main body having an intake passage 2 penetrating the inside thereof and a recess 1A provided below, and a float chamber main body 3 is arranged corresponding to the recess, and a collar portion 1B of the carburetor main body 1 and a float chamber main body Three
The floating chamber 5 is formed by fastening the collar portion 3A of the above with the screw 4.

The float 6 is arranged in the float chamber 5 and
The amount of fuel flowing into the float chamber 5 is controlled by the joint action of a valve seat and a float valve (not shown) to form a constant liquid level XX in the float chamber 5.

Reference numeral 7 denotes a cylindrical drain boss projecting downward from the bottom of the outer portion 3A of the float chamber main body 3.
A bottomed drain hole 8 having a lower end closed and an upper end opened to the bottom 5A of the float chamber 5 is formed. Further, in the vicinity of the bottom of the drain hole 8, a longitudinal axis Y- of the drain boss 7 is formed. Outer peripheral side portions 7A, 7 of the drain boss 7 that are substantially orthogonal to Y and face each other
Through holes 9A and 9B are formed in B through the drain hole 8. Therefore, the through holes 9A and 9B face each other.

The outer diameter φ of the drain boss 7 is set in the through holes 9A and 9B.
A rod-shaped operating rod 10 having an axial length L substantially the same as A is movably arranged, and both ends of the operating rod 10 are through holes.
It is supported by 9A and 9B.

The axial length L of the operating rod 10 is preferably smaller than the outer diameter φA of the drain boss 7.

A drain pipe 11 made of an elastic material such as rubber or synthetic resin is fitted to the outer peripheral portion 7C including the outer peripheral portions 7A and 7B facing each other of the drain boss 7. The lower end of 11 is opened to the atmosphere, and the through holes 9A and 9B are closed by the inner peripheral surface 11A of the drain pipe 11. This is because the inner peripheral surface 11A of the drain pipe 11 made of an elastic material is elastically fitted to the outer peripheral side portion 7C of the drain boss 7. Also, drain pipe
A pressing protrusion 11C extending outward is integrally formed on the outer periphery 11B corresponding to one of the through holes 11.

In addition, 12 is a clip made of a spring material for securely attaching the drain pipe 10 to the drain boss 7.
The mounting position for the drain boss 7 is through holes 9A, 9B.
It must be above the float chamber 5 side.

Thus, no external force is applied to the pressing projection 11C of the drain pipe 11 in a state where it is not necessary to extract the fuel in the float chamber 5, such as when the engine is operating.

According to this, since the operating rod 10 does not protrude from the outer peripheral side portion 7C of the drain boss 7, the drain pipe 11 has its elastic force so that the inner peripheral surface 11A of the drain pipe 11 has the outer peripheral side portion 7C of the drain boss 7.
Is held in place and the through holes 9A and 9B are
The fuel is stored in the inner peripheral surface 11A without fail, and the fuel stored in the floating chamber 5 does not leak to the outside through the drain hole 8. Then, after the engine is stopped, when the fuel in the floating chamber 5 is extracted, the pressing projection 11C of the drain pipe 11 is pressed to the right side in the drawing.

According to this, since the left end face of the operating rod 10 supported in the through hole 9A on the left side in the figure is pressed rightward by the pressing protrusion 11C, the right end face of the operating rod 10 is located rightward from the through hole 9B. The inner peripheral surface 11A of the drain pipe 11 is expanded to the right in the figure by projecting to the inside. The inner peripheral surface 11A of the drain pipe 11 opens the through hole 9B and the drain boss 7 below the through hole 9B. A gap h is formed between the outer peripheral side portion 7B and the inner peripheral surface 11A of the drain pipe 11. This state is shown by the dotted lines in FIGS. 1 and 2.

Thus, the fuel stored in the floating chamber 5 is drain hole 8
-Through hole 9B-Outer peripheral side 7B of drain boss 7 and drain pipe
The gas flows out into the drain pipe 11 through a gap h between the inner peripheral surface 11A and the inner peripheral surface 11A and is then discharged to the outside.

[Effect of device]

As described above, according to the carburetor drain device according to the present invention, the drain pipe itself is provided with the opening / closing valve function for opening and closing the through hole provided in the drain boss, and the pressing projection for operating the same, and the inside of the through hole is provided. Since the operating rod is located at the position, the number of parts can be greatly reduced.
Even in the assembling, the drain pipe can be fitted to the drain boss after the operating rod is simply arranged in the through hole, so that it can be performed very easily.By the above, it is possible to provide the drain device of the carburetor which is extremely inexpensive. It is a thing.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a drainage device for a vaporizer according to the present invention, and FIG. 2 is a transverse sectional view taken along line II-II of FIG. 3 ... Float chamber body, 3A ... Outside part 5 ... Float chamber, 5A ... Bottom part 7 ... Drain boss 7A, 7B ... Outer peripheral side parts of mutually facing drain boss 7C ... Outer peripheral side part, 8 ... Drain Holes 9A, 9B …… Through hole, 10 …… Operating rod 11 …… Drain pipe, 11A …… Inner peripheral surface 11C …… Pressing protrusion, h …… Gap

Claims (1)

[Scope of utility model registration request] 1. A carburetor in which a buoyancy chamber (5) is formed by a recess (1A) of a carburetor body (1) and a buoyancy chamber body (3), and a constant liquid surface is formed in the buoyancy chamber (3).
A cylindrical drain boss 7 provided with a bottomed drain hole 8 opening to the bottom 5A of the float chamber 5 is provided in a protruding manner, and further, the drain boss 7 is substantially orthogonal to the longitudinal axis Y-Y of the drain boss 7. Through holes 9A, 9B penetrating through the drain hole 8 are formed in the outer peripheral side portions 7A, 7B of the opposing drain boss 7, and the axial length of the through hole 9A, 9B is approximately the same as the outer diameter φA of the drain boss 7. L
The operating rod 10 having the above is arranged movably, while the outer peripheral side portion 7C of the drain boss 7 is fitted with a tubular drain pipe 11 made of an elastic material that closes at least the through holes 9A and 9B. Forming a pressing protrusion 11C on the outer periphery of the drain pipe 11 corresponding to at least one of the through holes,
When the fuel in the floating chamber 5 is discharged, the pressing projection 11C of the drain pipe 11 is pressed toward the inside of the drain boss 7 to move the operating rod 10 and the inner peripheral surface 11A of the drain pipe 11.
A drain device for a carburetor in which the other through hole is opened and a gap h communicating with the atmosphere is formed between the outer peripheral side portion 7C of the drain boss 7 and the inner peripheral surface 11A of the drain pipe 11.