JPS5929757A - Drain device of vaporizer - Google Patents

Abstract

PURPOSE:To prevent leakage of fuel occasioned by a drain valve remaining opened, by stopping the supply of fuel to a vaporizer when the drain valve for draining tar in the vaporizer is opened. CONSTITUTION:The body 2 of the vaporizer 1 of an LPG engine is partitioned by a partition wall 3 into a primary chamber 4 having an LPG inlet 6 and a secondary chamber 5 having an LPG outlet 7. A drain piping 25, in which an electromagnetic on-off valve 26 and a manually-operated drain valve 27 are located, is connected to the secondary chamber 5, the electromagnetic on-off valve 26 being held in a closed condition when an ignition switch 34 is brought to an ON-state. Meanwhile, an electromagnetic on-off valve 16, positioned in an inlet side passage 14 interconnecting an LPG tank 15 and the LPG inlet 6, is maintained in a closed condition with a first switch 35 closed and a second switch 37 opened by a sensor 28 when the drain valve 27 is fully or partially opened, and simultaneously, a pilot lamp 36 comes on.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drain device for draining tar in a vaporizer.

For example, in an engine that uses liquefied gas as fuel, such as an LPG engine, the liquefied gas is once depressurized and vaporized in a vaporizer, and then supplied to the engine combustion chamber through a mixer. A considerable amount of tar accumulates within the vaporizer, particularly in its secondary chamber, and there is a strong possibility that this tar may adhere to the diaphragm of the vaporizer or enter other operating parts and impede the function of the vaporizer.

For this reason, conventionally, as shown in Japanese Utility Model Application Publication No. 50-153312, a drain device is attached to the secondary chamber of the vaporizer, and the tar in the secondary chamber is drained to the outside by manually operating the drain pulp. I was trying to drain it. However, with this conventional drain device, if you forget to close the drain pulp, or if the valve is left open due to tar getting into the valve part, the vaporized fuel in the secondary chamber will drain during engine operation. This caused a dangerous situation in which the water leaked out through the valve. Liquefied gas engines are often used especially in taxis,
In taxis, the tar is removed by operating the drain valve after the day's work is finished, so the drain valve is opened and closed almost every day, and sometimes people forget to close the drain valve after draining the tar. This tends to happen.

Furthermore, the above-mentioned Japanese Utility Model Application Publication No. 50-1533'12 discloses a drain device that is provided with a spring that biases the valve body of the drain valve in the valve closing direction so that the drain valve is always closed unless an external force is applied. is also disclosed. This type of drain device eliminates the possibility of forgetting to close the drain valve, but if tar gets into the valve part, the drain valve will not close completely, resulting in the above-mentioned inconvenience. occurs.

An object of the present invention is to provide a vaporizer drain device that solves the above-mentioned problems.

The vaporizer drain device of the present invention is characterized in that it is provided with a fuel cut device that stops fuel supply to the vaporizer when the drain valve is opened.

If the fuel cut device as described above is provided, if the drain valve is left open, fuel will not be supplied to the vaporizer, so fuel will not leak outside through the drain valve.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 schematically shows one embodiment of the present invention applied to an LPG engine. Inside the main body 2 of the vaporizer 1,
A primary chamber 4 and a secondary chamber 5 are defined by a partition wall 3 . - Next room 4 has LPG population 6, and secondary room 5 has LP population
G exit floor entrance, these secondary chamber 4 and secondary chamber 5 are,
They are communicated through a communication path 8 formed in the partition wall 3. The opening degree (valve opening pressure) of the LPG population 6 is adjusted by a primary valve 1o that is interlocked with a secondary diaphragm 9, and the communication passage 8 is controlled by a lock-off diaphragm 12 that is interlocked with a secondary diaphragm 11. The opening degree (valve opening pressure) of the secondary valve 13 is adjusted. Since the structure and operation of such a vaporizer itself are well known, further detailed explanation will be omitted.

The LPG population 6 is connected to the LPG via an LPG inlet passage 14.
An electromagnetic on-off valve 16 as a fuel cut device is connected to the LPG inlet passage 14 . This electromagnetic on-off valve 16, as described later,
When the solenoid 16a is de-energized, it is in a closed state (the state shown in FIG. 1), and when the solenoid 16a is energized and excited, it is in its open state, which is a so-called open-when-energized type.

Via the LPG outlet floor LPG outlet side passage 17,
Mixer 19 provided in intake passage 18 (venturi portion 1 thereof)
It is connected to the fuel supply port 2° of 9a). A negative pressure outlet 22 opening into the intake passage 18 on the downstream side of the throttle valve 21 is connected via a pipe 23 to a negative pressure chamber 24 defined by the lock-off diaphragm 12.

A drain pipe 25 is provided in the secondary chamber 5 in the vaporizer 1.
are connected, and the secondary chamber 5 and the outside (atmosphere) are communicated through a drain passage 25a formed in the drain pipe 25. This drain pipe 25 is connected to the electromagnetic on-off valve 1 described above.
An electromagnetic on-off valve 26 of the type that closes when energized is opposite to 6, and a manually operated drain valve 27 is provided on the downstream side (atmospheric side) of this electromagnetic on-off valve 26. The drain valve 27 used in this embodiment includes a rotary valve body 27a and an operating lever 27 that projects from the rotary valve body 27a in the radial direction.
b, and when the operating lever 27b is grasped, the rotary valve body 27a is
It is opened and closed by rotating the .

A sensor 28 is attached to the drain valve 27 to detect its open/closed state. As shown in FIG. 2, this sensor 28 includes a contact switch 29 fixed near the drain valve 27, a support arm 30 extending radially from the rotary valve body 27a, and a support arm 30 that is screwed into the support arm 30. It consists of a screw 31 that is fitted together and a coil spring 32 that prevents the screw 31 from rotating. When the drain valve 27 is completely closed as shown in FIG. 2, the tip of the screw 31 presses the actuator 29a of the switch 29 to close the switch 29. Further, by threading the screw 31 forward and backward relative to the support arm 30, fine adjustment can be made so that the switch 29 is closed only when the drain nozzle 27 is in a completely closed state.

Next, the electrical connection relationship between the two electromagnetic on-off valves 16 and 26, the sensor 28, etc. will be explained.

An ignition switch 34 is connected to the positive electrode of the battery 33, and a first switch 35 is connected between the ignition switch 34 and the ground terminal (negative electrode of the battery 33).
Tonoguirotto lamps 36 are connected to each other in series,
Also, these first switch 35 and pilot lamp 36
The second switch 37 and the solenoid 16a of the electromagnetic on-off valve 16 are connected in series in parallel to each other. Further, an electromagnetic on-off valve 260 and solenoid 26a are connected in parallel to the second switch 37 and the solenoid 16a. The first and second switches 35 and 37 are the sensors 18
When the drain valve 27 is fully open or partially open (that is, not completely closed), the first switch 35 is closed and the second switch is open, and conversely, the drain valve 27 is completely closed. During this time, the first switch 35 is opened and the second switch is closed.

Hereinafter, one operation of the apparatus of this embodiment having the above configuration will be explained. First, when the engine is operated with the drain pulp 27 completely closed and the ignition switch 34 turned on,
Since the first switch 35 is opened and the second switch 37 is closed, the pilot lamp 36 goes out and the electromagnetic on-off valve 1
6 is open. On the other hand, since the ignition switch 34 is turned on, the electromagnetic on-off valve 26 remains closed regardless of whether the drain valve 27 is opened or closed. Therefore, the LPG in the LPG tank 15 is charged with electricity.

Magnetic on-off valve 16. The LPG population 6 of the vaporizer 1 enters the primary chamber 4 through the ceiling 10.

When LPG passes through the ceiling 10, the pressure is reduced to a level slightly higher than atmospheric pressure. The depressurized LPG is transferred to the primary chamber 4.
The air passes through the communication path 8, is reduced to approximately atmospheric pressure by the secondary valve 13, and enters the secondary chamber 5. LPG passes through the LPG outlet lower from the secondary chamber 5 and is then supplied to the fuel supply port 20 of the mixer 19.
to the engine combustion chamber (not shown).

As LPG is supplied as described above, tar begins to accumulate in the secondary chamber 5 within the vaporizer 1. The tar accumulated in this secondary chamber 5, the ignition switch 34
With the engine turned off and the engine stopped, the drain valve 27 is opened and the water is discharged to the outside. That is, since the electromagnetic on-off valve 26 is opened by turning off the ignition switch 34, when the drain pulp 27 is opened manually, the tar in the secondary chamber 5 is discharged to the outside.

After the tar is discharged, if the drain pulp 27 is completely closed, fuel can be supplied to the engine as described above by turning on the ignition switch 34. However, even if the ignition switch 34 is turned ON, if the drain valve 27 is not completely closed, the second switch 34
7 is opened, the electromagnetic on-off valve 16 is closed, and LPG is not supplied to the vaporizer 1.

Therefore, leakage of LPG to the outside of the vaporizer 1 through the drain pipe 25 is reliably prevented. Also, as mentioned above, if the drain valve 27 is not completely closed, the first
The switch 35 closes and the pilot lamp 36 lights up to notify the driver.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, an alarm buzzer or the like may be used instead of the pilot lamp 36, and the electromagnetic on-off valve 26 may be replaced with a drain drain. It may also be provided downstream of the valve 27. In addition, warning means such as a pilot lamp 36 (
Of course, the first switch 35) and the electromagnetic on-off valve 26, which are provided together with this, do not need to be provided.

As explained in detail above, the vaporizer drain device of the present invention cuts fuel supply to the vaporizer when the drain valve is open, and reliably prevents leakage of liquefied gas from the drain valve. According to this device, the safety of the liquefied gas engine is ensured.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a first embodiment 911 of the present invention, and FIG. 2 is an elevational view showing an example of a sensor provided in a drain valve. 1... Veno riser 14... l, PG population side passage 16... Solenoid on-off valve 25a... Drain passage 27... Drain nozzle valve 28... Sensor 37... Second switch

Claims (1)

[Claims] A fuel cut device that stops fuel supply to the vaporizer when the drain valve is opened in a drain device that has a drain passage in the vaporizer for discharging tar in the vaporizer that vaporizes liquefied petroleum gas and a drain valve in the drain passage. A vaporizer drain device characterized by being provided with.