JPS5879641A - Parallel running method and device of engine compressor - Google Patents

Abstract

PURPOSE:To decrease a fuel consumption quantity of a device, by detecting a use quantity of compressed air in a load then both controlling a sub-machine to a standby operational condition in case of an enough quantity only with operation condition in case of an enough quantity only with operation of a main machine and operating the sub-machine in case of an insufficient quantity only with the main machine. CONSTITUTION:Bypass valves 8, 8' are connected to both ends of pressure regulating valves 5, 5' of a main machine 1 and sub-machine 1', and check valves 9, 9' are connected to one end of pressure holding valves 7, 7' while solenoid valves 10, 10' are provided between the pressure holding valves 7, 7' and the check valves 9, 9'. Further a pressure switch 12 and selec tor switch 13 are provided between the solenoid valves 10, 10' and delivery valves 11, while the pressure switch 12 is set to a prescribed value. If air pressure reaches the prescribed value, the pressure switch 12 is operated, and the bypass valve 8' and the solenoid valve 10' in a side of the sub-machine 1' are opened, then internal pressure of a receiver tank 4' is decreased, while speed of an engine is controlled to a low speed by a speed regulator 6'. While if the air pressure is decreased to the prescribed value of less, the bypass valve 8' and the solenoid valve 10' are closed by the pressure switch 12, and the sub-machine 1' is driven in a normally operational condition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and device for parallel operation of engine compressors, which makes it possible to drive a load that cannot be driven by one compressor every 41 days, and when it can be supplied by one compressor, Virtually separates one unit from the other without having to perform separate operations.
The present invention relates to a method and apparatus for parallel operation of an engine compressor, which allows the engine compressor to be operated in a standby state without wasting fuel. .

BACKGROUND OF THE INVENTION As civil engineering construction work becomes larger, mechanized, and rationalized, equipment that uses compressed air is becoming more diverse and larger. On the other hand, the compressed air should be supplied for 11 m.
However, the size of the engine compressor is also increasing.
Large engine compressors have poor portability and may not be able to be transported to construction sites, and using only large engine compressors is extremely uneconomical due to the use of small compressed air tools. Parallel operation of small engine compressors becomes effective.

In such a case, it may be possible to connect the compressed air discharge ports of several II engine compressors via check valves, but simply connecting them via check valves will not work. Even when using only a load that can be sufficiently supplied by one compressor, multiple compressors are operated, which has the disadvantage that the total amount of fuel consumption becomes larger than when only one compressor is operated.

The present invention is based on the above-mentioned circumstances, and when the amount of compressed air used can be detected and only one unit can supply it, the pressure in the receiver tank of the other engine compressor is as low as fE"14/-. In addition to reducing the load, the engine speed is controlled to a low-speed standby mode to reduce fuel consumption, and even if compressed air usage increases rapidly, the standby mode is automatically canceled. I was able to respond immediately.

The following will be explained based on the original w4v drawings. Note that the present invention can be used in parallel operation of several units, but v! For the sake of clarity, the parallel operation rtr of the main engine and two slave engine compressors will be explained. Figure 1 is a block diagram showing the method of the present invention. The method of the present invention has the following configuration.

If the amount of compressed air used by the load is detected and it is sufficient to operate the main engine, the internal pressure of the receiver tank of the slave engine connected in parallel via a check valve can be set to a low pressure. A method for parallel operation of an engine compressor, characterized in that the engine compressor is controlled to a low-speed standby operating state, and when operating only the main engine causes a supply shortage, the main engine and the slave engine are operated together.

That is, rather than simply operating multiple engine compressors in parallel, the system detects the amount of compressed air used by the load and automatically controls the operation of the slave units. An example apparatus based on this method will be described below.

The embodiment shown in Figure 2 is 2all-! engine compressors 1, 1' of the same model. *L? , :4 so 2
．． f is an air compressor and has a capacity regulator 3.3° for adjusting the amount of air taken into the air compressor.

4.4' is a receiver tank, and 5 and 5' are pressure regulating valves, which begin to open when the internal pressure of the receiver tank 4.4' is 7/a1, and fully open when the internal pressure is 7,84/a11. 6.
t is engine revolution 11! The swinging rods 6b, 6M swing due to fluctuations in the pressure inside the diaphragms 116m, 81, and the swinging rods 6b, 6b'
An engine speed governor (not shown) connected to K is controlled, and the rotational speed of the engine is adjusted by this K. 7.7' is a pressure holding valve connected to the Resino (tank 4.4'KII), which is a valve that is fully closed when the internal pressure of the Resino (Tajik) is below 341011 m degrees.The above is the same configuration as the conventionally known engine compressor. .

Reference numeral 8.8' denotes a forced flow valve connected to both ends of the pressure regulating valve 5.5', which is opened by energizing the electromagnetic solenoid and closed by cutting off the electric current.

On the other hand, the receiver tank 4.4' of the pressure holding valve 7.7' and other 1
14 is a check valve 9. y is connected, and there is no air inflow to the pressure holding valve side. In addition, the above-mentioned pressure holding valve], γ and check valve 9,
9'Vii A solenoid valve 0.10 having the same structure as the above-mentioned convoluted flow valve 8.
．． Check valve 9. The other ends of the pressure holding valves 7 and 7' are connected by a pipe, and discharge valves 33, 11, . . . are provided. The iron pipe line is equipped with a pressure switch 12 as a compressed air usage amount detector and a changeover switch 13 for switching between the main engine and the slave engine. The solenoid valve 1σ and the convoluted flow valve 8' are opened depending on the switching state of the configuration pressure.

With the above configuration, if the main 1fIkl and slave l' engines are started with all the discharge valves 11, 11, . . . closed, the pneumatic motor 2. l is capacity regulator 3.3
Air is taken in through ', pressure am valves 5, 5' are opened, rotational speed regulator 6.6'f1 die'r75 dam chamber 6m, @a'
and capacity #I4 rectifier 3. Diaphragm 113m, 3
The internal pressure of the engine 1 increases, slowing down the engine rotation, and closing the valves in the capacity regulators 3 and 3', making it impossible to take in air. As a result of this, the internal pressure of the receiver tank rises to 7,8r#/c11 at which the pressure regulating valve 5.5' is fully opened, and then stops rising.

On the other hand, if the pressure increases, for example, turn on the pressure switch 12 provided at the connection point between the discharge valves 33, 31... and the check valves 9, 9' at 7.41 [27 cm] or more. On the other hand, if the pressure decreases, OF to 7s/d or less.
If the pressure switch is equipped with a hysteresis characteristic to prevent F The side flow valve 8' and the solenoid valve 1σ of ' are opened. Therefore, receiver tank 4'
The compressed air in the receiver tank 4' is released into the atmosphere via the solenoid valve 1σ. Since the inflow of compressed air from the main engine l side is blocked by the check valve 9', the internal pressure of the receiver tank 4' is controlled by the pressure holding valve τ. It descends to 34/a11 where it is blocked. On the other hand, by opening the side flow valve, the pressure-adjusted engine rotational speed is controlled to a low speed.

After that, connect the load to the rear of the discharge valves 33 and 31.

If the discharge valves 33, 33... are opened and a negative device is used, the detected pressure of the pressure switch 12 will drop, and if the amount of compressed air used exceeds the supply capacity of the main engine 1, the 4j pressure switch 12 will be activated. Therefore, the side flow valve and the solenoid valve [σ] are closed, and the slave unit l' also returns to its normal operating state. In this case, even if the detected pressure of the pressure switch 12 increases due to the operation of the slave unit 1', the pressure switch 12 has a hysteresis characteristic and will not malfunction.

Furthermore, since both the main machine and the slave machine have a [1iJ-] configuration, the master-slave relationship can be changed very easily by switching the changeover switch 13. From this, the changeover switch 13
It is possible to switch manually or automatically. In other words, because the fuel consumption of the main engine is larger than that of the slave engine due to the above configuration, when the remaining amount of fuel falls below a predetermined value, the fuel consumption is automatically switched by the operation of a liquid level sensor, etc., or the tie-r
You may change master and slave alternately by switching with -.

In the above description, the main engine and the slave engine are two engine compressors of the same model, but based on the technical idea of the present invention, a plurality of engine compressors of different models may be used. Also,
Although the pressure switch 12 is used as the compressed air usage amount detector in this embodiment, there is no limitation to this;
The same effect can be achieved by electrically detecting the displacement of the swinging rod 6t/ of the rotational speed regulator and using the detection signal.

According to the present invention described above, the load that is insufficient due to the operation of the main engine alone can be compensated for by the parallel operation of the slave engine, so it is possible to obtain an engine compressor that can quickly respond to changes in load. Since the operation of the slave units can be switched, alternating driving of the engine compressor as a whole is realized, increasing the lifespan of the equipment and providing durability. Furthermore, when the main engine is operating, the slave engine is operated smoothly by the compressed air usage amount detector, and until then the slave engine is in standby operation, so fuel consumption is low and economical running costs can be expected. Therefore, it is extremely economical compared to operating multiple units of the same model independently and in parallel, and even if several units are combined, the main unit and slave units can be separated and operated independently. It is possible to expand the applications.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the method of the present invention, and Figure 2 is a schematic diagram showing the configuration of a parallel operation device for engine compressors that implements the method of the present invention.

Claims (1)

[Claims] (11) If the amount of compressed air used in the load is detected and it is sufficient to operate the main engine, the internal pressure of the receiver tank of the slave engine connected for free flow is reduced to a low pressure through the check valve. At the same time, the rotation of the engine/engine is controlled to a low-speed standby operation state, and if only the main engine is operated, there is a shortage of supply. Parallel operation method. (2) Detect the amount of air required for at least 92 main engine combiners t connected in parallel via check valves, the discharge valve connected to the check valve, and the scissor discharge valve. A compressed air usage amount detector, a side flow valve that flows both ports of the pressure regulating valve in the slave machine based on the operation of the wrinkled compressed air usage amount detection result, and a valve that releases the pressure in the receiver tank to the atmosphere. A parallel rotation device for an engine compressor, characterized by comprising: