JPS6114608Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism for controlling evaporative gas generated from a float chamber of a vaporizer.

Conventionally, this type of mechanism communicates the air chamber of the float chamber with a charcoal canister etc. through a valve.
[1] There is a method in which the valve is operated by intake pipe negative pressure, and [2] there is a method in which switching between the inner vent and the canister is performed using the intake pipe negative pressure and mechanical interlocking or a combination of electromagnets. However, in the method [1], the inner vent side closes and the canister side opens due to a decrease in intake pipe negative pressure during high-speed rotation.
This will cause inconvenience to the normal operation of the gate. As a countermeasure to this problem, a method has been devised in which the inner vent and the canister side opening are switched by using the intake pipe negative pressure and a mechanical action interlocking mechanism, or by using an electromagnet in combination with [2], but the action interlocking mechanism etc. Not only is this extremely complicated, but the valve is fixed to the diaphragm rod, so when the valve comes into contact with the valve seat, the rod cannot be moved any further by adsorption, and the retention force in the sealed state is weak. There is a drawback that the inner vent side closes during rotation.

The purpose of this invention is to propose a mechanism to solve the above-mentioned problems. Specifically, a steam exhaust passage is provided in the air chamber A of the float chamber 3, and this passage is connected to a communication passage to the inner vent side. The openings 7 and 10 of the communication path to the canister side are provided to face each other, and a valve shaft is moved in the axial direction between the inner vent side opening 7 and the canister side opening 10 to prepare for this. The valve body 11 is configured to alternately close both openings, and the valve body 11 faces a negative pressure valve V that operates the valve stem in a direction to close the canister side opening 10 and an end face of the valve stem. The valve body 11 has an electromagnet 18 having a fixed iron core 21 arranged therein, and the valve body 11 is slidably inserted into a narrow diameter portion having a stepped portion of the valve shaft 13. A spring 17 is engaged on one side to urge the inner vent side opening 7 in the closing direction, and a relief spring 20 is engaged on the other side to bring the end face of the valve shaft into close contact with the fixed iron core. Next, an embodiment of this invention shown in the drawings will be described.

1 is a throttle valve installed in the intake pipe 2, 3 is a float chamber, and the fuel oil level H is controlled by a float 4, etc.
are kept. Reference numeral 5 denotes an inner vent, one end 6 of which opens upstream of the intake pipe 2, and the other end 7 of which opens into the air chamber A above the oil level of the float chamber 3. Further, one end 9 of the communication passage 8 communicates with a charcoal canister or the like (not shown), and the other end 10 communicates with the air chamber A similarly to the inner vent 5.
V is a negative pressure valve that forms a negative pressure chamber 14 partitioned by a diaphragm mechanism 12, and the negative pressure chamber 14 is communicated downstream of the throttle valve 1 through a passage 15. In the diaphragm mechanism 12, a valve body 11 is movably fitted into a narrow diameter portion of a valve stem 13, and a spring 20 is interposed between the valve body 11 and a spring support plate 22 fixed to the valve stem 13. . One side of the valve body 11 faces the inner vent side opening 7, and the other side faces the canister side opening 10. 17 is valve body 1
A spring 16 urges the valve 1 toward the inner vent side opening, and a diaphragm 16 is provided in the passage 15.
On the negative pressure chamber 14 side of the negative pressure valve V, an electromagnet 18 and a magnetic body 19 subjected to the action of the electromagnet are provided integrally with the valve shaft 13 via a diaphragm. The electromagnet's power source is connected to a key switch or generator (alternator). Reference numeral 21 denotes a fixed core of an electromagnet, which is disposed opposite to the end surface of the shaft 19.

Next, the operation will be explained.

When the engine is stopped, there is no negative pressure in the intake pipe and no current flows through the solenoid valve, so the valve body 11 closes the inner vent side opening 7 by the action of the spring 17, and the canister side opening closes. Part 10
The evaporated gas generated in the float chamber 3 is guided to the canister etc. through the communication path 8.

When the engine is started, the diaphragm mechanism acts against the spring 17 due to the negative pressure in the intake pipe, and the valve body 11 opens the inner vent side opening 7 and closes the canister side opening 10.

Furthermore, the magnetic body 19 is attracted and moved toward the fixed iron core 21 by the action of the electromagnet 18, but at this time, due to the relief action of the spring 20, the valve body 7 is engaged with the canister side opening 10, and the valve shaft 13 is moved. The spring 20 moves only when the shaft 1
It functions as a relief mechanism to ensure close contact between the fixed core 9 and the fixed core 21.

When the engine is operating at high speed, the negative pressure in the intake pipe becomes small, and the force of the spring 20 causes the valve shaft 13 to move, and at the same time, the force of the spring 17 acts on the valve body 11, causing it to move away from the canister side opening 10. However, the canister side opening 10 is kept closed due to the attraction force between the magnetic body 19 and the fixed iron core 21. As described above, with this invention, when the engine is stopped, evaporative gas from the float chamber is not released into the atmosphere or into the intake pipe, and air pollution due to release into the atmosphere and re-occurrence due to evaporative gas filling the intake pipe are avoided. It is possible to eliminate starting problems and the like, and since the effect of the inner vent is not impaired during engine operation, the engine capacity can be fully demonstrated. In particular, this invention has an electromagnet 18 having a fixed iron core 21 disposed opposite to the end face of the valve shaft, and the valve body 11 is slidably inserted into a narrow stepped portion of the valve shaft 13. A spring 17 is provided on one side of the valve body 11 to urge it in a direction to close the inner vent side opening 7, and a relief spring 20 is provided on the other side for bringing the end face of the valve shaft into close contact with the fixed iron core. Since they are engaged, the magnetic body 19 can be reliably attracted to the fixed core by the relief action of the relief spring 20, and the power of the electromagnet can be utilized to the fullest. Therefore, the electromagnet has the advantage of being small in size and requiring low electric power, as well as reinforcing the closing force of the canister side opening of the valve body 11, and is extremely effective in practice.

[Brief explanation of the drawing]

The drawing is a sectional view showing an embodiment of this invention. 3... Float chamber, A... Air chamber, 7... Inner vent side opening, 10... Canister side opening, 1
1... Valve body, 13... Valve shaft, 17... Spring, 18... Electromagnet, 19... Magnetic body, 20...
Relief spring, 21... Fixed iron core, 22... Spring support plate, V... Negative pressure valve.

Claims (1)

[Scope of utility model registration request] A steam exhaust passage is provided in the air chamber A of the float chamber 3, and openings 7 and 10 for a communication passage to the inner vent side and a communication passage to the canister side are respectively provided in the passage, and these openings on the inner vent side are provided. A valve body is provided between the portion 7 and the canister side opening 10 by moving the valve shaft in the axial direction, so that the valve body alternately closes both the openings.
An electromagnet 1 having a negative pressure valve V that operates a valve shaft in a direction in which the valve body 11 closes the canister side opening 10 and a fixed iron core 21 disposed opposite to the end surface of the valve shaft.
8, the valve body 11 is slidably inserted into a narrow diameter portion having a stepped portion of the valve shaft 13, and the valve body 1
1 is engaged with a spring 17 for biasing the inner vent side opening 7 in a direction to close it, and a relief spring 20 for bringing the end face of the valve shaft into close contact with the fixed iron core on the other side. An evaporative gas control device for a vaporizer, characterized in that: