JPS6358251B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a package type compressor, particularly for handling combustible gases that may cause explosions under certain conditions.
For example, it relates to a ventilation system in a package compressor whose driving source is an engine that uses city gas or LP gas as fuel.

A package-type compressor uses a ventilation fan that constantly rotates inside the box to draw in and exhaust outside air, and exhaust heat generated from the compressor body, receiver tank, etc. housed inside the box to ventilate the inside of the box. There is.

However, in the case of a package compressor housing an engine that uses flammable gas as fuel that can cause an explosion, gas may leak from the fuel piping system during operation of the compressor or especially when starting the engine. Since the box may be full of gas, there is a great risk that sparks will be generated from the electrical system during engine operation, especially when the starter motor of the engine is started, resulting in a gas explosion. Therefore, for such packaged compressors, it has been proposed that all the electrical equipment used for the engine and compressor starting and control circuits be explosion-proof, but these are much more expensive than the standard type. It was hot.

The purpose of the present invention is to provide a package type compressor that is inexpensive, has a simple configuration, and is highly safe without the risk of gas explosion, in place of the conventional extremely expensive explosion-proof type. Its features include an outside air inlet and outlet on the outer wall;
A package compressor comprising an engine that uses flammable gas as fuel and a compressor that is driven by the engine in a box body that is provided with a ventilation fan that takes in and exhausts outside air, wherein the engine is equipped with a starter switch; The starter motor is connected via a contact that closes in response to the operation signal of the ventilation fan, so that the starter motor of the engine cannot be started until after the ventilation fan has started, and the engine stop device is connected to the The system is configured to operate upon detecting the loss of the operating signal for the ventilation fan, and is configured to stop the engine when the ventilation fan stops.

Hereinafter, details of the present invention will be explained based on illustrated embodiments.

In Fig. 1, 1 is a package, that is, a box;
It has an inlet 2 and an outlet 3 on the outer wall, and a ventilation fan 4 is provided facing the outlet 3. Inside box 1,
A compressor 5, a driving engine 6 for the compressor 5 directly connected to the compressor 5, and a receiver tank 7 are housed in the compressor 5.
An air cleaner 9 is provided on the main body via an unloader 8 that communicates with the suction chamber of the compressor 5. The air cleaner 9 and the engine intake air cleaner 13 are combined into one intake pipe 14, and the air intake port 15 of the intake pipe 14 is connected to the air cleaner 9. is open to the outside of the box body 1. The gas to be compressed is sucked into the compressor 5 from the intake port 15 via the air cleaner 9 and the unloader 8, and is compressed and discharged to the receiver tank 7 together with lubricating oil for lubrication, sealing, and cooling supplied to the compressor. The compressed gas from which the lubricating oil has been separated in the receiver tank 7 is sent under pressure to an aftercooler (not shown), cooled there, and then used as appropriate via a supply pipe.

As described above, the package type compressor houses the compressor body and other related equipment in the box body 1 for the purpose of increasing the soundproofing effect. In addition, 10 in the same figure
11 is an exhaust pipe of the engine 6, and 12 is a water-cooled heat exchanger for cooling the engine.

2 and 3 show one embodiment of the present invention, in which the ventilation fan 4 is connected to a three-phase AC power supply 23 in series with a ventilation fan magnetic contactor 52Fa1, A ventilation fan stop button is installed on the DC power source taken from the two-phase power supply.
Connect PB-S, starting button PB-L, and self-holding relay 20 in series. Connect the a contact 20a of the relay 20 in series with the stop button PB-S and in parallel with the start button PB-L, and connect the relay 52F of the ventilation fan magnetic contactor in series with the stop button PB-S and the contact 20a. Katsu relay 20
Connect in parallel with

As shown in FIG. 3, the external contact 52Fa2 of the relay 52F is connected in series with the starter switch SS and the relay MS of the starter magnetic switch, and the series circuit is connected to the a contact of the starter relay.
It is connected to a power source 22 such as a battery in parallel with a series circuit consisting of SRa, relay SM of the starter motor, a contact MSa of the starter magnetic switch, and starter relay SR.

According to the above embodiment, the ventilation fan starting button PB-
When L is turned on, relay 20 is energized and contact 2
0a turns ON and the section is self-held. At the same time, the relay 52F is energized, the ventilation fan magnetic contactor 52Fa1 is turned on, and the ventilation fan is started. As mentioned above, when relay 52F is ON, external contact 52Fa
2 is also ON, and when starter switch SS is set to the start position, points B and C are connected, starter magnetic switch relay MS is turned ON, and its contact MSa is ON, and starter relay SR is turned on.
is ON and the contact SRa is ON, so the voltage is applied to the relay SM of the starter motor, the starter motor starts, and the engine starts operating.

When the ventilation fan stop button PB-S is pressed, the ventilation fan magnetic contactor 52Fa1 switches to relay 5.
When the 2F is turned off, electricity is de-energized and the ventilation fan 4 stops.

FIGS. 4 and 5 show another embodiment of the present invention, and only the points different from the previous embodiment will be described below. As shown in FIG. 4, a heater element 51 is provided between the ventilation fan 4 and the ventilation fan magnetic contactor 52Fa1, and the b contact 51b of the heater element 51 is connected in series with the relay 30 to the DC power source between the two phases of the power supply 23. . A contact 30a of relay 30
1 in series with the ventilation fan stop button PB-S,
Connect timer T in series with contact 20a and relay 2
0, connect in parallel with relay 52F. As shown in FIG. 5, the external contact Ta of the timer T is connected in series with the relay MS of the starter magnetic switch. The a contact 52Fa2 of the relay 52F, the a contact 30a2 of the relay 30, and the solenoid valve SV are connected in series, and the relay IG is connected in series with the contacts 52Fa2 and 30a2 and in parallel with the solenoid valve SV. The solenoid valve SV is a solenoid valve that opens when energized (closes when de-energized).
This is an engine stop device that stops the supply of combustible gas as fuel, while the relay IG is an engine stop device that opens its a contact (not shown) to stop power to the engine spark plug when it is not energized.

Note that the engine stopping device is not limited to the above embodiment.

In this embodiment, the button PB for starting the ventilation fan
The process from turning on -L to starting the ventilation fan 4 is the same as in the above embodiment, but turning on the starting button PB-L.
As a result, the timer T is energized via the contact 20a, and after the set time of the timer has elapsed, the external contact TaON of the timer T activates the relay of the magnetic switch.
MS turns ON, the starter motor starts, and the engine 6 starts operating, as in the previous embodiment.
(Figure 5).

Further, when the ventilation fan 4 is overloaded, the heater element 51 is heated, and the contact 51 of the heater element 51 is heated.
b turns OFF, relay 30 turns OFF and contact 30
a1 is OFF, so the relay 52F is de-energized and the ventilation fan 4 is stopped. At this time, the external contact 30a2 is turned OFF in the relay 30 which has been turned OFF, and the gas supply pipe 10 that supplies fuel to the engine 6
The solenoid valve SV and the relay IG, which connect and cut off the communication, are de-energized, the solenoid valve is closed, the supply of fuel to the engine 6 is stopped, and the energization to the engine spark plug is stopped. Therefore, the engine 6 is stopped.

Further, if the operator accidentally operates the ventilation fan stop button PB-S while the engine is running, the relay 52F is turned OFF and the ventilation fan 4 is stopped. At this time, external contact 52Fa2 opens, solenoid valve SV and relay IG are both de-energized as described above, and engine 6 is stopped.

As described above, since the present invention ventilates the inside of the package before starting the engine, only the ventilation fan and the starting circuit of the ventilation fan need be made explosion-proof, and this makes it even more effective in achieving the object of the present invention. .

As described above, the present invention provides an engine that uses flammable gas as fuel, and an engine that uses flammable gas as fuel, which is housed in a box body that has an outside air inlet and an outlet on the outer wall and is provided with a ventilation fan that takes in and exhausts the outside air. In a package type compressor that houses a compressor, the starter switch of the engine and the starter motor are connected through a contact that is closed in response to the operation signal of the ventilation fan, so that it is possible to Even if flammable gas, which is fuel, leaks, the gas is discharged into the box by the ventilation fan, making it possible to prevent explosions caused by sparks generated from the starting circuit when the engine's starter motor starts. In addition, the ventilation fan prevents gas from accumulating inside the package even during operation after the engine is started, thereby increasing the safety of the package compressor.

Furthermore, since the engine stop device is configured to operate upon detecting the disappearance of the operating signal for the ventilation fan, even if the ventilation fan has stopped, by stopping the engine, the ventilation fan can be stopped while the engine is still operating. It is possible to prevent explosion accidents due to stoppage.

Furthermore, if the contact that is closed by the operation signal of the ventilation fan connected to the engine starter switch is used as the contact of the delay circuit that is activated by the operation signal,
Before starting the engine, i.e. when the starter switch is turned off.
The inside of the package cage must be sufficiently ventilated before turning on to prevent explosions.

Further, according to the present invention, only the ventilation fan and the starting circuit for the ventilation fan need be made explosion-proof, and therefore a packaged compressor with high safety can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the inside of a package type compressor, Figs. 2 and 3 show one embodiment of the present invention, and Figs. 4 and 5 show other embodiments of the present invention. 2 and 4 are ventilation fan starting circuits, and FIGS. 3 and 5 are engine starting circuits. 1...Package (box body), 2...Inhalation port, 3
...Exhaust port, 4...Ventilation fan, 5...Compressor, 6...
...Engine, 10...Gas supply pipe, PB-L...
Ventilation fan start button, SS...Engine starter switch, MS...Relay (starter magnetic switch), SM...Relay (starter motor), PB-S...Ventilation fan stop button, 52F...
...Relay, 52Fa2...External contact (relay 52
F), 51... Heater element, 51b... Contact (heater element).

Claims (1)

[Scope of Claims] 1. An engine that uses flammable gas as fuel and is housed in a box body that has an outside air inlet and an outlet on an outer wall and is provided with a ventilation fan that takes in and exhausts the outside air, and the engine is used as a drive source. A package type compressor housing a compressor that uses combustible gas as fuel, characterized in that a starter switch of the engine and a starter motor are connected via a contact that is closed in response to an operation signal of the ventilation fan. A ventilation system for a package compressor that uses an engine as its driving source. 2. A package compressor driven by an engine that uses flammable gas as fuel according to claim 1, wherein the contact that is closed by the operation signal of the ventilation fan is the contact of a timer that is activated by the operation signal. Ventilation equipment. 3. A ventilation system for a package-type compressor using an engine that uses flammable gas as fuel as a drive source as claimed in claim 1, wherein the ventilation fan and the starting circuit of the ventilation fan are explosion-proof. 4. An engine that uses flammable gas as fuel and a compressor that uses the engine as a drive source are housed in a box that has an outside air inlet and outlet on the outer wall and is equipped with a ventilation fan that takes in and exhausts the outside air. A package type compressor comprising: an engine that uses flammable gas as fuel as a driving source, wherein the engine stop device is configured to operate upon detecting that the operation signal for the ventilation fan is lost. Ventilation system for packaged compressors. 5. A package compressor driven by an engine that uses flammable gas as fuel according to claim 4, wherein the contact that is closed by the operation signal of the ventilation fan is the contact of a timer that is activated by the operation signal. Ventilation equipment. 6. A ventilation system for a package-type compressor using an engine that uses flammable gas as fuel as a driving source according to claim 4, wherein the ventilation fan and the starting circuit of the ventilation fan are explosion-proof.