JP2003239770A - Air compressor with engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the rotational frequency of an engine in reducing the rotational frequency of the engine when the pressure in an air tank reaches a prescribed value and a slowdown mechanism is operated. <P>SOLUTION: The air compressor with the engine has the slowdown mechanism for shifting a throttle lever of the engine to the low-speed side by moving a piston of a slowdown cylinder and an acceleration wire connected to the piston when the pressure in the air tank is increased to the prescribed value and an unloader mechanism is operated. In the air compressor, the slowdown cylinder is moved relative to a fixed member, and the quantity of shifting of the throttle lever based on the movement of the piston is adjusted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air compressor driven by an internal combustion engine type engine.

[0002]

2. Description of the Related Art An air compressor is installed as a set using an internal combustion engine such as a diesel engine or a gasoline engine as a driving source. That is, the air compressor is driven by these engines, and the generated compressed air is stored in the air tank and consumed. In this case, when the pressure in the air tank reaches the specified pressure, the unloader pilot valve that detects the pressure in the air tank is activated, and the suction valve of the air compressor is opened to prevent generation of further compressed air. At the same time, a slowdown mechanism for lowering the engine speed is provided.

[0003]

In particular, in the case of a diesel engine, since only one lever for adjusting the engine speed is provided as a throttle lever, this lever had to be directly controlled. . For this reason, as a slowdown mechanism when using a diesel engine, a slowdown cylinder is provided in the path leading to the air tank, and when the pressure in this path reaches a specified pressure, the piston is moved and the wire is used to throttle the engine throttle. It was to move the lever to the low speed side (note that in this state, the unloader mechanism operates and no more compressed air is generated).

At this time, the throttle lever when the piston does not move and the slowdown mechanism does not operate is normally set to the full throttle position. Therefore, the engine reached the maximum rotation speed immediately after the start-up when compressed air was not used, resulting in excessive fuel consumption and increased noise. Therefore, in the present invention, the position of the slowdown cylinder can be adjusted to freely adjust the engine speed.

On the other hand, the engine and the air compressor are directly connected by a belt transmission mechanism or the like, and the load of the air compressor directly becomes the load of the engine. Since this can be said at the time of starting, when the engine is started, compressed air in the air tank is released to avoid overload. Otherwise, the starter motor and battery for start-up will be adversely affected.Therefore, an exhaust valve is inserted in the route from the air compressor to the air tank, and this exhaust valve is opened at start-up. . However, there are times when you forget to start it in an overloaded state. Therefore, the present invention prevents the engine from starting when the engine is overloaded.

[0006]

Under the above problems, the present invention moves the piston of the slow down cylinder when the pressure in the air tank rises to a specified pressure, as described in claim 1.
In an air compressor with an engine equipped with a slowdown mechanism that moves the accelerator wire linked to the piston to move the throttle lever of the engine to the low speed side, the slowdown cylinder can be moved relative to the fixed member to move the piston. The present invention provides an engine-equipped air compressor characterized in that the shift amount of a throttle lever based on the engine can be adjusted.

When the slowdown cylinder is movable with respect to the fixed member so that the distance between the slowdown cylinder and the throttle lever can be adjusted, the high and low speed position of the throttle lever can be adjusted even when the slowdown cylinder does not operate, and the engine speed can be increased. Can be adjusted. Therefore, immediately after the start-up when the compressed air is not used, this adjustment is performed to lower the engine speed from the maximum speed, so that fuel consumption and noise can be suppressed.

Of course, when the compressed air starts to be used, the operation of the unloader mechanism stops, the piston of the slowdown cylinder also returns, and the throttle lever moves to the high speed side, but at this high speed position, when the rotational speed is low, , Return the slowdown cylinder to its original position and operate it at full throttle. The adjustment of the position of the slowdown cylinder is performed by attaching an adjusting screw to the slowdown cylinder described in claim 2, passing the adjusting screw through an insertion hole formed in the fixing member, and tightening with a nut to fix it.
If the insertion hole is a long hole, the operation can be performed quickly with a simple structure.

Further, according to the present invention, an exhaust valve is inserted into a discharge pipe communicating from an air compressor to an air tank, and the exhaust valve is opened at the time of starting to release the pressure in the discharge pipe. In an air compressor with an engine having a load start prevention mechanism, a pressure switch was inserted in the discharge pipe, and when the pressure switch detected an overload pressure at engine startup, the engine startup was disabled. A characteristic air compressor with an engine is provided.

A pressure switch is inserted in the discharge pipe leading to the air tank, and when the pressure switch detects a pressure that causes an overload at the time of engine startup, the engine is disabled from starting, so that the engine is not overloaded. It is possible to avoid the situation where is started. In this case, if the engine is started by the starter motor and the pressure switch detects a predetermined pressure, the starter electric circuit of the starter motor cannot be energized. This can be achieved and damage to the starter motor and battery can be prevented. Further, by providing a pilot lamp in the starting electric circuit, which is turned off when the pressure switch detects a predetermined pressure and is turned on when the pressure is not detected, this can be easily identified.

Further, according to the present invention, an exhaust valve is inserted into a discharge pipe communicating from an air compressor to an air tank according to claim 6, and at the time of starting, the exhaust valve is opened to release the pressure in the discharge pipe. In an engine-equipped air compressor having a load start-up prevention mechanism, an electromagnetic valve that connects or disconnects with outside air is inserted in a discharge pipe, and the solenoid valve is switched to a position where it communicates with outside air by a predetermined pre-start operation. Provided with an air compressor.

By providing the solenoid valve, the exhaust valve is automatically exhausted when it is necessary, so that it is not necessary to provide the exhaust valve. As the pre-starting operation at this time, if the pre-starting operation described in claim 7 is energization to the heater for preheating the cylinder of the engine, this operation is always performed immediately before starting in the diesel engine. , Secure and does not require any special operation.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view of a slowdown mechanism showing an example of the present invention, and FIG. 2 is a front view of a main part. The throttle lever 1 of the engine has an access cable including an outer cable 2a and an inner wire 2b. One end of the inner wire 2b of the wire 2 is connected, and the other end extends to the slowdown cylinder 4 fixed to the fixing member 3 and is connected to the piston 5.

A cap 7 is provided on the head side of the cylinder 6 of the slowdown cylinder 4, and an adjusting screw 8 is attached to the cap 7. The adjusting screw 8 is inserted through an insertion hole 9 formed in the fixing member 3, and when the nut 10 screwed into the adjusting screw 8 is tightened, the fixing member 3 is sandwiched between the cylinder 6 and the nut 10 so that the cylinder 6 moves. It can be fixed.

In this embodiment, the insertion hole 9 is a long hole, and the cylinder 6 can be moved along the fixing member by loosening the nut 10 (3a is for smoothing this movement). When the nut 10 is tightened, the guide is attached to the fixed member 3 and movably fits the cylinder 6).
It will be fixed in that position. A knob 11 is attached to the outer end of the adjusting screw 8. Slow down cylinder 4
Is a single-acting type in which the spring 12 is inserted into the back pressure chamber, and the air passage 13 formed in the cap 7 from the positive pressure chamber.
Has been extended.

From the connection port of the air passage 13, the air tank 1
4, a communication pipe 16 extending to the unloader pilot valve 15 extends, and the communication pipe 16 is an air compressor 17
Is also connected to the unloader mechanism 32 provided in the.
FIG. 3 is a sectional view of the unloader mechanism 32. The pilot pressure of the unloader pilot valve 15a is guided to the unloader piston 33 of the unloader mechanism 32. When this reaches a specified pressure, the piston 33 is moved to move the air compressor 17. The suction valve 34 is opened to perform the unloader operation (35 is the suction port of the air compressor 17, and 36 is the discharge port).

As a result, when the pressure in the air tank 14 rises to the specified pressure, the unloader mechanism 32 operates and the air compressor 1
7 performs unloader operation, but at the same time, the pressure lowers the piston 5 of the slowdown cylinder 4 against the spring 12 in FIG. 2, moves the accelerator wire 2 to move the throttle lever 1 to the low speed side, and Reduce the rotation speed.

Until now, the position of the slowdown cylinder 4 has been fixed, and when the unloader mechanism 32 operates, the maximum rotation speed is reached as soon as the engine is started. In particular, at this time, the air compressor 17 is operated at a low load, so the engine speed was particularly high. However, according to the present invention, since the position of the slowdown cylinder 4 can be adjusted, the engine speed can be freely adjusted.

That is, since it is normal to not enter the working state of using compressed air immediately after the engine is started,
At this time, loosen the nut 10 and slide the cylinder 4
Is brought close to the throttle lever 1 side (lowered in FIG. 2), and warm-up operation may be performed at a low speed to some extent. Then, when the compressed air starts to be used, if the rotation speed is low, the slauder cylinder 4 may be returned to its original position (raised in FIG. 2) to perform high-speed operation.

At this time, since the knob 11 may be grasped by one hand and the nut 10 may be operated by the other hand, there is an advantage that this operation is quick and easy. Outer cable 2
Both ends of a are fixed to the fixing member 3, and at this time, a tension bolt 18 for adjusting the tension of the inner wire 2b is provided at one end thereof. A stopper 19 for adjusting the low speed position is also provided near the throttle lever 1.

FIG. 4 is also an explanatory view of an overload start-up prevention mechanism showing an example of the present invention. A discharge pipe 21 is connected to the discharge port of the air compressor 17 driven by the internal combustion engine 20 and the air tank 14. The exhaust valve 22 is inserted therein. In the present invention, the pressure switch 23 is inserted in the discharge pipe 21, and the pressure at which the pressure switch 23 is overloaded when the engine is started, that is, the pressure air having a predetermined pressure remains in the air tank 14 and the discharge pipe 21. It works when it detects the time.

In this example, the closed contact 23b of the pressure switch 23 is inserted in the starting electric circuit 26 connecting the starter motor 24 and the battery 25. In this state, the starter motor 24 does not rotate and the engine 20 starts. do not do. Therefore, when the starter motor 24 does not rotate, the exhaust valve 22 is opened to allow the pressurized air in this path to escape. At this time, another closed contact 23b of the starting electric circuit 26
If the pilot lamp 27 is connected to, it will be understood that the engine 20 cannot be started when the pilot lamp 27 is not lit, so it is not necessary to check why it is not started.

Instead of this, a solenoid valve 28 for communicating with or blocking the outside air is inserted in the discharge pipe 21, and the solenoid valve 28 is operated by a predetermined pre-start operation to automatically compress the compressed air therein. It is also possible to escape. The operation of the solenoid valve 28 can be performed by a series of operations if it is carried out before starting, for example, if it is inserted in the heating circuit of the heater 29 for preheating the cylinder of the engine 20 (of course, it may be a single operation. ). This has an advantage that the exhaust valve 23 and the pressure switch 23 are unnecessary.

The pressure switch 2 in the discharge pipe 21 as described above.
3 and a check valve 30 is provided on the downstream side of the solenoid valve 28 (on the side of the air tank 14) so that the high-pressure air in the air tank 14 does not flow back to them. Furthermore, the air tank 1
An extraction pipe 31 for extracting high-pressure air whose opening / closing is controlled by an opening / closing valve 31 extends from the valve 4.

[0025]

As described above, according to the present invention, it is possible to avoid the full throttle of the engine immediately after start-up, in which compressed air is not yet used, so that it is possible to suppress fuel consumption and noise, which leads to energy saving and environmental improvement. It also prevents the engine from starting in an overloaded state and prevents damage to the starter motor and battery.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a slow town mechanism showing an example of the present invention.

FIG. 2 is an explanatory diagram of a main part of a slow town mechanism showing an example of the present invention.

FIG. 3 is a sectional view of an unloader mechanism of an air compressor showing an example of the present invention.

FIG. 4 is an explanatory diagram of an overload activation prevention device showing an example of the present invention.

[Explanation of symbols]

1 Throttle lever 2 accelerator wire 3 fixing members 4 Slaud Cylinder 5 pistons 6 cylinders 8 adjustment screws 9 insertion holes 10 nuts 14 air tank 17 Air compressor 21 discharge pipe 22 Exhaust valve 23 Pressure switch 24 cell motor 26 Start-up electric circuit 27 pilot lamp 28 Solenoid valve 29 Heater

Claims (7)

[Claims] 1. When the pressure of the air tank rises to a specified pressure and the unloader mechanism operates, the piston of the slowdown cylinder is moved, and the accelerator wire connected to the piston is moved to move the throttle lever of the engine to the low speed side. An engine-equipped air compressor having a down mechanism, wherein a slowdown cylinder is movable with respect to a fixed member, and a shift amount of a throttle lever based on movement of a piston can be adjusted. . 2. The air with an engine according to claim 1, wherein an adjusting screw is attached to the slowdown cylinder, the adjusting screw is passed through an insertion hole formed in the fixing member and is tightened with a nut to be fixed, and the insertion hole is a long hole. Compressor. 3. An air compressor with an engine having an overload start-up prevention mechanism for inserting an exhaust valve into a discharge pipe leading from an air compressor to an air tank and opening the exhaust valve to release the pressure in the discharge pipe at the time of start-up. 2. An air compressor with an engine, wherein a pressure switch is inserted in the discharge pipe, and the engine is disabled when the pressure switch detects an overload pressure at engine startup. 4. The air compressor with an engine according to claim 3, wherein the engine is started by a starter motor, and when the pressure switch detects a predetermined pressure, the energization of a starter electric circuit of the starter motor is disabled. 5. The air compressor with an engine according to claim 4, wherein the starting electric circuit is provided with a pilot lamp which is turned off when the pressure switch detects a predetermined pressure and is turned on when it is not detected. 6. An air compressor with an engine having an overload start prevention mechanism in which an exhaust valve is inserted into a discharge pipe leading from the air compressor to an air tank, and the exhaust valve is opened at the time of start to release the pressure in the discharge pipe. 2. An air compressor with an engine according to, wherein a solenoid valve that communicates with or shuts off the outside air is inserted into the discharge pipe, and the solenoid valve is switched to a position where the outside valve communicates with the outside air by a predetermined pre-start operation. 7. The air compressor with an engine according to claim 6, wherein the pre-start operation is energization of a heater for preheating a cylinder of the engine.