JPS643806Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a paperizer that gasifies LPG under reduced pressure and sends it to the mixer, when LPG is mixed with air in the mixer and supplied to the engine.

As is well known, the paperizer uses LPG in a pressure-resistant container.
The primary chamber where LPG is introduced and the gasified LPG into the mixer
When the gas pressure in the secondary chamber becomes negative, a passage connecting the primary chamber and the secondary chamber is linked to the movement of the membrane that partitions the secondary chamber and the air chamber. It is designed to open and send LPG from the primary chamber through the secondary chamber to the mixer. In such a paperizer, the membrane operates normally by freely discharging pressure pulsations generated in the bench lily of the mixer and transmitted to the secondary chamber to the air chamber side.

By the way, in order to improve the idle reproducibility of the engine and always perform stable idle operation, the air chamber may be connected to an air cleaner at the inlet of the mixer instead of being opened to the atmosphere. When this system was adopted, it was found through testing that when the engine speed was gradually increased from idling speed, the air-fuel mixture became extremely lean in a certain speed range, regardless of the load. This is because there is a time difference between the pressure pulsations of the engine intake air being transmitted from the mixer's bench lily to the secondary chamber and from the air cleaner to the air chamber, and if the timing of the pressure pulsations and the pressure difference between the two chambers meet certain conditions, It is thought that the pressure pulsations transmitted to the next chamber cannot freely escape to the air chamber side, and as a result, the normal movement of the membrane is inhibited, making it difficult to open the passage connecting the primary and secondary chambers. This will cause problems with engine performance.

This invention was devised for the purpose of eliminating the above-mentioned drawbacks of a paperizer in which an air chamber facing a secondary chamber with a membrane sandwiched therebetween is communicated with an air cleaner through an air passage. It is characterized by being equipped with a variable volume pressure regulator that absorbs pressure pulsations.

Next, an embodiment of the present invention will be explained based on the drawings. In FIGS. 1 and 2, 1 is a vaporizer, 14 is a mixer, 17 is an air cleaner, and the vaporizer 1 is a pressure-resistant container 2 filled with LPG. The primary chamber 4 has an inlet port 3 connected thereto, and the nozzle 1 has an opening in the bench lily 15 of the mixer 14.
A passage 7 communicates with a secondary chamber 6 having an open outlet 5 for sending gasified LPG into the primary chamber 4.
The inlet 3 is opened and closed by a primary valve 10 that is linked to a membrane 9 that partitions the air chamber 6 and the air chamber 8, and a secondary valve 13 that is linked to a membrane 12 that partitions the secondary chamber 6 and the air chamber 11. The passage 7 is opened and closed by the . An air chamber 11 facing the secondary chamber 6
communicates with the air cleaner 17 through an air passage 20, and a pressure regulator 21 is provided in the air chamber 11 or the air passage 20.

In the embodiment shown in FIG. 1, an air passage 20 is connected to an air intake port 18 of an air cleaner 17, and a pressure regulating device
1 facing the air chamber 11. The pressure regulating device 21 includes a diaphragm 22 forming a part of the wall of the air chamber 11 and a spring 2 acting on both sides of the diaphragm 22.
3 and 24, and the surface of the diaphragm 22 opposite to the air chamber 11 is open to the atmosphere.

In the embodiment shown in FIG. 2, an air passage 20 inside an element 19 of an air cleaner 7 is connected and a pressure regulating device 21 is provided facing the air passage 20. The pressure regulating device 21 is formed by a bellows 25, the space 26 of which is in communication with the air passage 20, and the outside is exposed to the atmosphere.

According to the present invention configured in this way, by appropriately setting the amount of change in volume due to the movement of the diaphragm or bellows depending on the volume of the air chamber and air passage, pressure pulsations in the engine intake air can be transferred from the vent lily of the mixer to the secondary chamber. The volume of the air chamber and air passage changes freely and sufficiently when the pressure is transmitted to the air chamber, so that the pressure change in the secondary chamber due to pressure pulsation is completely released to the air chamber side without inhibiting the movement of the membrane. The membrane follows the pressure pulsations of the bench lily and operates normally. In addition, pressure pulsations transmitted to the air chamber via the air cleaner are absorbed by the pressure regulator, so almost constant pressure always acts on the membrane, and the movement of the membrane due to pressure pulsations in the secondary chamber is not affected. This eliminates the drawback that the air-fuel mixture becomes extremely lean in a certain rotational speed range of the engine, and the LPG
can be stably supplied.

[Brief explanation of the drawing]

FIGS. 1 and 2 are longitudinal sectional views showing different embodiments of the present invention. 1...vaporizer, 6...secondary chamber, 11...
Air chamber, 12... Membrane, 13... Secondary valve, 14...
Mixer, 15... Bench lily, 17... Air cleaner, 20... Air passage, 21... Pressure regulator, 2
2...Diaphragm, 23, 24...Spring, 25
...Bellows.

Claims (1)

[Scope of utility model registration request] A vaporizer in which an air chamber facing a secondary chamber with a membrane in between is communicated with an air cleaner through an air passage, characterized in that the air chamber or the air passage is provided with a variable volume pressure regulating device for absorbing pressure pulsations. vaporizer.