JPS5929760A - Drain device of vaporizer - Google Patents

Abstract

PURPOSE:To prevent leakage of fuel occasioned by a drain valve remaining opened, by sounding an alarm when a drain valve for draining tar in a 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, wherein an electromagnetic on-off valve 26, being closed with an ignition switch 34 ON and opened with the switch OFF, and a manually-operated drain valve 27 are positioned in series, is connected to the secondary chamber 5. Meanwhile, an electromagnetic on-off valve 16, located in an LPG inlet side passage 14, is closed 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, an alarm such as pilot lamp 36 or the like is actuated.

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 externally by manual operation of the drain valve. 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 No. 50-15331.2 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 an alarm device that detects opening of the drain valve and issues an alarm.

By providing the above warning device, it is possible to prevent a dangerous situation in which the liquefied gas engine is operated with the drain valve open and vaporized fuel leaks outside the engine.

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 . - LPG population 6 in coal chamber 4 and LP population in secondary chamber 5
The G outlet lower is opened, and these coal 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 secondary valve 10 that is interlocked with a secondary diaphragm 9, and the communication passage 8 is also 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] 3 is adjusted. Since the structure and operation of such a vaporizer itself have been well known, further detailed explanation will be omitted.

The LPG population 6 is connected to the LPG via an LPG inlet passage 14.
It is connected to the PG tank 15, and the L Pa inlet side passage 1
4, there is an electromagnetic on-off valve 16 as a fuel cut device.
is connected. As will be described later, this electromagnetic on-off valve 16 is in a closed state (the state shown in FIG. 1) when the solenoid 16a is de-energized, and is in an open state when the solenoid 16a is energized and excited, so-called energized state. It is a time-opening type.

The LPG output lower via the LPG outlet side passage 17,
Mixer 19 provided in intake passage 18 (venturi portion 1 thereof)
It is connected to the fuel supply port 20 of 9a). A negative pressure outlet 22 opening into the intake passage 8 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 the electromagnetic on-off valve 26, and a manually operated drain valve 27 is provided on the downstream side (atmospheric side) of the 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 pulp 27, a support arm 30 extending radially from the rotary valve body 27a, and a support arm 30 screwed into the support arm 30. The screw 31 is made up of a screw 31 and a coil spring 32 that prevents the screw 31 from rotating. When the drain pulp 27 reaches the completely closed state 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 is made so that the switch 29 is closed only when the drain valve 27 is in a completely closed state.

Next, the two electromagnetic on-off valves 16 and 26, the sensor 28, and the alarm device etc. that are the characteristic parts of this device will be explained.

An ignition switch 34 is connected to the positive terminal of the battery 33, and a first switch 35 is connected between the ignition switch 34 and the ground terminal (negative terminal of the battery 33).
and a pilot lamp 36 as an alarm device are connected in series with each other, and in parallel with these first switch 35 and pilot lamp 36, a second switch 37 and a solenoid 16a of the electromagnetic on-off valve 16 are connected in series with each other. has been done. Furthermore, the second switch 37 and the solenoid 1
Solenoid 26 of electromagnetic on-off valve 26 is connected in parallel to 6a.
a is connected. Above 1st and 2nd switch 35.37
is controlled by the sensor 18, and the tren pulp 27 is fully opened or partially opened (that is, when it is not completely closed).
When the drain valve 27 is completely closed, the first switch 35 is closed and the second switch is open. Conversely, when the drain valve 27 is completely closed, the first switch 35 is open and the second switch is closed. The pilot lamp 36 described above is for informing the driver that the drain valve 27 is in the open state, and is provided at a position that is easily visible to the driver, such as on the ink or tormendo panel of the vehicle.

The operation of the apparatus of this embodiment having the above configuration will be explained below. First, when the engine is operated with the drain valve 27 completely closed and the ignition switch 34 turned on, the first switch 35 is opened and the second switch 37 is closed, so the pilot lamp 36 goes out and the electromagnetic on-off valve 16 is turned off.
is open. On the other hand, the electromagnetic on-off valve 264! By turning on the ignition switch 34, the closed state is maintained regardless of whether the drain valve 27 is opened or closed. Therefore, L in the LPG tank 15, G is the electromagnetic on-off valve 16, the LPG population in the vaporizer 1 is 6, and the ceiling is 10.
Go through it and enter House 4.

When the LPG passes through the ceiling 10, the pressure is reduced to a level slightly higher than atmospheric pressure. The depressurized LPG passes through the communication path 8 from the single-person home 4, is depressurized to approximately atmospheric pressure by the secondary valve 13, and enters the secondary chamber 5. LPG is in secondary chamber 5
The LPG exits from the fuel supply port 20 of the mixer 19 through the LPG output lower.
to the engine combustion chamber (not shown).

As LPG is supplied as described above, tar accumulates in the secondary chamber 5 within the vaporizer 1. The tar accumulated in the secondary chamber 5 is discharged to the outside by opening the tren pulp 27 while the ignition switch 34 is turned off to stop the engine. That is, by turning off the ignition switch 34, the electromagnetic on-off valve 2
6 will open, so if you open the drain valve 27 manually,
The tar in the secondary chamber 5 is discharged to the outside.

After draining the tar, if the drain valve 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 pulp 27 is not completely closed, the first
The switch 35 closes and the pilot lamp 36 lights up to notify the driver. After the pilot lamp 36 lights up in this way, the drain valve 27 is completely closed, or if necessary, the tar trapped in the drain valve 27 is removed and closed, and then the ignition switch 34 is turned on. sometimes pilot lamp 36
does not light up, the electromagnetic on-off valve 16 opens, and LPG is supplied to the vaporizer 1.

Although one embodiment of the present invention has been described above, the present invention is not limited to the second embodiment. For example, an alarm sound may be generated instead of the pilot lamp 36. In order to generate this kind of alarm sound, in addition to using an electric buzzer to replace the pilot lamp 36, a "whistle mechanism" is built into a part of the drain pipe 25 downstream of the drain valve 27, and Piping 2
5, the cylinder mechanism may generate an alarm sound when the vaporized fuel flows.

Further, the electromagnetic on-off valve 26 may not be particularly provided, and the second switch 37 may be omitted and the electromagnetic on-off valve 16 may be replaced with a so-called fuel lock valve that closes when the ignition switch 34 is turned off.

As explained in detail above, the vaporizer drain device of the present invention can prevent the occurrence of a dangerous situation in which the liquefied gas engine is operated with the drain pulp open, thereby improving the safety of the liquefied gas engine. This greatly contributes to improvement.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing one embodiment of the present invention, and FIG. 2 is an elevational view showing an example of a sensor provided in a drain pulp. ■...Vaporizer 25a...Drain passage 27
...Drain valve 28...Sensor 35...First switch 36...Pilot lamp Fig. 1 Fig. 2

Claims (1)

[Claims] In a drain device in which a drain passage is established in a vaporizer for discharging tar in a vaporizer that vaporizes liquefied petroleum gas, and a drain valve is installed in the drain passage, an alarm is issued by detecting the opening of the drain valve. A vaporizer drain device characterized by being equipped with an alarm device.