JPS6017261A - Vaporizer - Google Patents

Abstract

PURPOSE:To obtain improved running performance from idling to medium-speed driving by providing communication between a primary chamber and a secondary chamber of a vaporizer through a bypass whose flow effective area is adjustable, and to make a balance spring whose spring force is adjustable act on a membrane adapted for opening and closing a secondary valve. CONSTITUTION:A vaporizer 1 has an inlet port 3 for making connection with a LPG tank 2, a primary chamber 4 having a primary valve 9 for opening and closing the inlet port 3 and a secondary chamber 6 adapted for supplying LPG in form of decompressed gas to a nozzle port 42 opening in a venturi 41 of a mixing device 40. The primary chamber 4 and secondary chamber 6 are communi- cated independently through a bypass 21 in which an adjustable restriction 25 is provided. The membrane 11 for actuating a secondary valve 12 which serves to open and close a passage 13 forming connection between the primary chamber 4 and the secondary chamber 6 is urged by a balance spring 28 to close the secondary valve 12. The spring force of the balance spring 28 is adjustable through an adjusting screw 31, a counter lever 27 and a balance lever 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vaporizer that gasifies LPG under reduced pressure and sends it to a mixer when the LPG is mixed with air in a mixer and supplied to an engine.

As is well known, a vaporizer is equipped with a primary chamber into which LPG from a pressure-resistant container is introduced, and a secondary chamber through which the reduced-pressure gasification (-gasified) LPG is sent to a mixer. The passage connecting the primary and secondary chambers is opened in conjunction with the movement of the membrane that separates the primary and air chambers, allowing LPG to be sent from the primary chamber to the mixer via the secondary chamber. .the passage is closed by a secondary valve actuated by a valve-closing spring;
When the membrane moves towards the secondary chamber, the secondary valve opens. That is, when the engine is stopped, both the secondary chamber and the air chamber are at atmospheric pressure, so the secondary valve has eI due to the action of the valve closing spring.
Although the n path is closed, the engine starts and generates suction negative pressure, and the gas pressure in the secondary chamber is lower than atmospheric pressure (1, c7.;
: The membrane moves toward the secondary chamber due to the pressure difference, overcomes the force of the valve closing spring, and opens the secondary 9P.

When the engine is idle, it acts on the secondary chamber.
Since the suction negative pressure is low, the membrane overcomes the force of the valve closing spring and moves toward συ1, and the passage is closed unless a differential pressure sufficient to open the secondary valve is generated. Not only is there a tendency to run out of mains and fuel scum that are sent from the secondary chamber to the mixer, but the supply of fuel scum is likely to become unstable because the secondary valve closes immediately even if it is opened. Become. Therefore, in the vaporizer, in order to supply a certain gftt of fuel gas to the engine during engine idling to perform stable idling, the - missing character and the secondary chamber are separated from the passage opened and closed by the secondary valve. Bypass system (for example, see Japanese Utility Model Application No. 5G-152855), in which the 79 lance spring acts in the valve opening direction against the closing spring of the quadratic square. was applied to the membrane.
It is advantageous to provide an idle adjustment device based on the lance method (for example, refer to Utility Model Application Publication No. 55-1949).The bypass method allows communication between the primary and secondary chambers even if the passage is closed. Since LPG is sent to the missing character,
It is possible to always perform stable idling, and the idling reproducibility is good, but the fuel gas supply when transitioning from idling to light dog load low speed to medium speed operation (σ)
There is a problem with connection performance. In addition, with the lance method, when the secondary valve starts to open, the load acting on the secondary valve and the lift of the secondary valve can be made proportional until the balance spring is in equilibrium with the valve closing spring. The fuel gas supply connection performance when transitioning to medium-speed operation is good, but there is a problem with idle reproducibility.

An object of the present invention is to provide a vaporizer with good idle reproducibility and fuel gas supply connection characteristics by using both the bypass method and the balance method, which have opposite advantages and burn points. It is.

The present invention achieves this objective.

The primary chamber into which LPG is introduced, and the second chamber where LPG is gasified under reduced pressure.
and a secondary valve for opening/closing a passage connecting the secondary chamber and the secondary chamber, and the secondary valve connects the secondary chamber and the air chamber. In a vaporizer, the valve is opened by the movement of the separated membrane into the secondary chamber and closed by the action of the valve closing spring, and the effective area of the passage connecting the secondary chamber and the secondary chamber is 1 m It is characterized by comprising two adjustable lance springs, and a lance spring that acts on the membrane in the direction of opening the secondary valve and whose spring force is adjustable.

Next, specific examples of the present invention will be explained with reference to the drawings.

In the figure, reference numeral 1 designates a 7ζ riser according to the present invention, which has a primary chamber 4 with an inlet 3 opened to which a pressure-resistant container 2 filled with LPG is connected, and a venturi 41 of a mixer 40 with an opening. LPG gasified under reduced pressure to the nozzle port 42
It has a secondary chamber 6 having an open outlet 5 for sending out the
- Opening and closing of the introduction port 3 is performed by the primary cell 9 linked to the membrane 8 that partitions the bill 4 and the air chamber 7, and the secondary chamber 6 and the air chamber 10 are opened and closed.
A passage 13 connecting the missing part 4 and the secondary chamber 6 is opened and closed by a secondary valve J2 which is interlocked with a membrane J1 separated from the main chamber 11.

The secondary valve J2 is rotatably built into the secondary chamber 6 and has a valve closing spring]
4 is attached to one end of the secondary valve lever 15,
The other end of this secondary valve lever 15 is in contact engagement with the center of the membrane 11.

When the gas pressure in the secondary rhinoceros 6 is lower than the atmospheric pressure, the membrane 11 moves toward the secondary chamber 6 due to the pressure difference between the atmospheric pressure and the gas pressure, compresses the valve closing spring 14, and compresses the secondary valve lever 15. is rotated around the support shaft 16 to separate the secondary valve 12 from the passage] 3, and the primary N4 LPG is introduced into the secondary chamber 6 and sent from the outlet 5 to the mixer 40, where it is mixed with air. It supplies the engine.

Reference numeral 17 denotes a locking mechanism, and a negative pressure chamber 9 separated from the secondary chamber 6 by a working membrane 18 is connected to the intake pipe 43 of the engine.
When the engine is stopped, the operating membrane 18 pushes the secondary valve lever 5 and cooperates with the valve closing spring 4 to close the secondary valve 12. However, when the engine is running, suction 9 pressure is introduced into the negative pressure chamber 19, and the working membrane 8 is sucked against the force of the lock spring 20, and the secondary valve 12 can be opened by separating it from the secondary valve lever 15. It is intended to be in a state of

The present invention provides two types of vaporizers having the above structure, including a bypass type idle adjustment device and a lance type idle adjustment device.

That is, the bill 4 and the secondary chamber 6 are communicated through a bypass 21 separately from the passage 3, and a needle-shaped valve 23 provided at the tip of the adjusting screw 22 is inserted into the valve seat 24 of the pie puff 210. Bypass 2 by adjustable throttle 25 configured by
This allows the effective area of the first passage to be adjusted as desired.

In addition, a balance lever 26 and a counter lever 27 are rotatably built into the air chamber 10, and the tip of the balance lever 26 and the center of the membrane 11 are arranged opposite to the contact engagement point of the secondary valve lever 15. At the same time, the balance spring 28 is inserted, and the tip of the counter lever 27 is brought into contact with the base Qm of the balance V bar 26, and the balance lever 2
An adjustment spring 30 acting in the direction of weakening the force of the balance spring 28 is applied to the base end side of the support shaft 29 of No. 6, and the tip of the adjustment screw 31 is brought into contact with the base end of the counter lever 27. When the adjustment screw 31 of this balance type idle adjustment device is screwed in, the counter lever 27 rotates about the spindle 32 in the open direction as shown in the figure, and the balance lever 26 is rotated counterclockwise, causing the balance lever 28 to rotate. is compressed to sharpen the opening operation of the secondary valve 12. Conversely, when the adjustment screw 31 is screwed out, the two levers 26 are moved by the force of the two springs 28 and 30.
．． 27 rotates in the opposite direction to the above.

The balance spring 28 expands to slow the opening movement of the secondary valve 12.

When the engine starts and the gas pressure in the secondary chamber 6 becomes low (-
Bill 4's LPG will go through Bypass 21.

When the pressure difference between the atmospheric pressure and the gas pressure in the secondary chamber 6 is above a certain level, the secondary valve 12 is opened by the movement of the membrane 11, and the LPG of the missing character 4 is introduced into the secondary chamber 6. is passageway 1
3 is also introduced into the secondary chamber 6. When transitioning from idling to medium-speed operation through low-speed eaves loading, the negative pressure generated at the nozzle port 42 of the mixer 40 gradually increases, and as a result, PMll is sucked toward the secondary chamber 6 and becomes larger. At this time, the load acting on the secondary valve ]2 is applied to the secondary valve 1 until the balance spring 28 is in equilibrium with the valve closing spring 14.
The engine rotation speed increases in proportion to the opening of the throttle valve of the mixer 4o. In high-speed driving range, balance bounce 28
is separated from the membrane 11, and the position of the membrane 11 and therefore the secondary valve 120 is controlled only by the gas pressure in the secondary chamber J2 and the force of the valve closing spring 14.
The opening degree is controlled.

It should be noted that a counter lever 27 is interposed in the balance lever 26. : (It may also come into direct contact with the adjustment screw 31.)

As described above, according to the present invention, which is equipped with both a bypass type and a balance type idle adjustment device, the amount of non-fuel gas required for the idle link is 1/2 or more, preferably 80%.
The two adjustment screws 22 and 3] are manually operated from the outside so that about 100 ml of the liquid is introduced into the secondary chamber 6 through the bypass 21 and the remaining amount is introduced into the secondary chamber 6 through the passage 13. By adjusting the effective passage area of the bypass 21 and adjusting the strength of the balance spring 28, the opening of the secondary valve 12 is appropriately slowed down.

During idle linking, LPG is mainly supplied from the bypass 21 to always perform stable idle linking and to improve idle reproducibility.

In addition, when shifting from idle link to medium speed operation -1-7-1, the opening operation of the secondary valve]2 corresponds to the throttle valve opening of the mixer 40 by the action of the balance spring 28 and the valve closing spring 14. This makes it possible to improve the fuel gas supply connection performance, and stable operation of the engine can be expected in the operating range from idle to medium speed operation.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an embodiment of the invention. J・・・・・・vaporizer, 4・・・・・・−missing character,
6...Secondary chamber,】0...Air chamber, 1】
...Membrane-2...Secondary valve, 13...
・・Passage,】4・・・・Valve closing spring, 15・・・・
・Secondary valve lever, 21... Bypass, 22...
Eyes... Poem ah L:, , 25...Aperture, 2
6...Balance lever. 28...Balance spring, 3]...Adjustment screw. Agent Mutsuaki Nozawa

Claims (1)

[Claims] The secondary chamber is equipped with a primary chamber for introducing LPG, a secondary chamber for sending the depressurized gasified LPG to a mixer, and a secondary valve for opening and closing a passage connecting the above-mentioned blank and the secondary chamber. The valve is mJ
The membrane separating the secondary air chamber moves toward the secondary chamberfvJ
In the vaporizer, the valve opens by the action of the valve and closes by the action of the valve spring;
1. A vaporizer comprising: a balance spring which acts on the secondary valve in the direction of opening the secondary valve and whose spring force is adjustable.