JPS5821100B2 - Air-driven starting device for internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air-driven starter for starting an internal combustion engine such as a gas turbine.

Generally, an internal combustion engine such as a gas turbine for power supply in a computer room is not allowed to stop on one side of the computer itself, so it is necessary to start the internal combustion engine quickly and reliably in the event of an emergency such as a power outage.

Conventionally, starting devices for internal combustion engines such as those described above that are powered by an electric motor require a large torque when starting the internal combustion engine, and as a result, the electric motor requires a large current, so There is a problem in that large-sized and large-capacity storage batteries must be constantly maintained and managed.

Therefore, in recent years, starting devices using air motors as a power source have come into use.

In such an air motor type starting device, a helical spline is formed at the other end of the rotating shaft, which has one end connected to the drive shaft of the Bendex type transmission means that is mechanically connected to the transmission device, that is, the drive shaft of the air motor. A transmission means is adopted in which a pinion is engaged with the spline portion so as to be movable in the axial direction, and the pinion moves by inertia due to the rotational drive of the air motor, and engages with a ring gear provided in the internal combustion engine to start the internal combustion engine. There is.

However, in such a mechanism, the pinion is configured so that it rapidly pops out and engages with the ring gear while rotating at high speed, so when it engages, the pinion receives a large impact force that may damage the teeth or damage the rotating shaft. However, there is a problem in that the shock torque can cause damage.

The present invention has been made in view of these points, and includes moving a starting rotation shaft of a transmission device rotationally driven by an air motor forward and backward using piston means, and controlling compressed air supplied to the air motor using valve means. The main object of the present invention is to provide an air-driven starting device for an internal combustion engine which eliminates the above-mentioned problems by interconnecting the piston means and the valve means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes an air-driven starting device, which starts an internal combustion engine such as a gas turbine for power supply in a computer room, and a starting rotating shaft 2 connected to the starting shaft of the internal combustion engine. An air motor 4 for driving the starting rotating shaft 2 is connected to a transmission device 3 for moving the starting rotation shaft 2 in the axial direction using compressed air.

Further, as shown in FIG. 2, the transmission device 3 has a piston valve 6 fitted into the casing 5 so as to be slidable only in the axial direction, and further penetrates through the casing 5 and the piston valve 6 to form a starting rotation shaft. 2 is rotatably supported, and a bear link 7.7 is interposed between the starting rotating shaft 2 and the piston valve 6, so that the starting rotating shaft 2 and the piston valve 6 can move forward and backward together only in the axial direction. is rotatably supported by the piston valve 6.

One end of the starting rotation shaft 2 is connected to the drive shaft 4a of the air motor 4 via a reduction gear (not shown), and an involute spline 8 is provided at the other end. It is disconnected from the shaft.

In addition, the inside of the casing 5 is controlled by a piston valve 6.
It is divided into a first air chamber 9a and a second air chamber 9b.

A piston valve 6 is disposed in the fourth air chamber 9a, and a spring 10 that biases the piston valve 6 in the direction of disconnection (to the right in FIG. is compressed, and a slight clearance 8a is formed between the casing 5 and the rear portion of the involute spline 8 of the starting rotation shaft 2.

Therefore, when the starting rotating shaft 2 moves slightly, the clearance 8a is closed and the inside of the first air chamber 9a becomes airtight. As a result, the piston portion 6a of the piston valve 6 exhibits a cushion spring action so that it does not come into violent contact with the casing 5.

Further, an air hole 11 is provided in the casing 5, with one end opening to the second air chamber 9b and the other end opening to the outside air.

Thus, piston means 12 are formed which, when compressed air is injected to connect the starting shaft 2, cause the piston valve 6 to connect the starting shaft 2 to the starting shaft of the internal combustion engine. direction (leftward in FIG. 2).

Further, the casing 5 has first and second exhaust holes 13a, one end of which is open to the outside air, and the other end of which is opened into the casing 5.
, 13b are formed respectively, and first and second recesses 14a and 14b are provided in the valve portion 6a of the piston valve 6 corresponding to the first and second exhaust holes 13a and 13b, so that the valve means 15 It is formed.

The valve means 15 controls the amount of air supplied to the air motor 4, and the eleventh recess 14a is connected to the piston valve 6.
When the piston valve 6 moves slightly in the connecting direction, the second air chamber 9b and the first exhaust hole 13a are communicated with each other, and the piston valve 6 further moves to close the fourth exhaust hole 13a, and the second air chamber 9b is connected to the first exhaust hole 13a. When the starting rotating shaft 2 moves to a state where the spline 8 is almost completely engaged with the starting shaft of the internal combustion engine, the second air chamber 9b and the second exhaust hole 13b are brought into communication.

An air 1 control means 16 is connected to the piston means 12 and the valve means 15 in such a manner that the air control means 16 causes the air motor 4 to rotate at a low speed at the beginning of the connection operation of the starting rotation shaft 2.

That is, the air source 17 is branched into a transmission air supply path 21 and an air motor air supply path 22 through a filter 18 , a regulator 19 and a lubricator 20 , and the transmission air supply path 21 is connected through an electromagnetic switching valve 23 . The electromagnetic switching valve 23 is connected to the air hole 11 of the transmission device 3, and is formed in a three-bottom, two-position type having a discharge part 23a and a supply part 23b, and a solenoid 24 is provided on the side.

The air motor air supply path 22 is connected to the air motor 4 via a switching valve 25, and the switching valve 25 connects the stop section 25a and the supply section 2.
The pilot line 25c is connected to the second exhaust hole 13b of the transmission device 3 via the check valve 21, and the pilot line 25c is connected to the second exhaust hole 13b of the transmission device 3 via the check valve 21. When more pressure is applied, it is configured to switch to the supply section 25b.

The first exhaust hole 13a of the transmission device 3 is connected to the air motor air supply passage 22 via a check valve 28 to form an initial air supply passage 29, and the air supply is performed only at the initial stage of driving (the initial stage of connection operation) of the air motor 4. Compressed air is supplied from the passage 29 to rotate at a low speed.

The transmission air supply path 21 is also connected to the virofloft line 25c of the switching valve 25 via a check valve 30.

A power source 31, an operation switch 32, and a pressure switch 33 are sequentially connected and wired to the solenoid 24 of the electromagnetic switching valve 23, and the pressure switch 33 is turned off when the exhaust gas pressure reaches a set value after the internal combustion engine has started. .

In addition, 34 is a rotation pin that restricts the rotation of the piston valve 60, 35 is a main shaft, 36 is a key, and 37 is a connecting fitting.

Next, to explain the operation, when the operation switch 32 is turned on to start the internal combustion engine, the solenoid 24 is activated and the electromagnetic switching valve 23 is switched to the supply section 23b, and compressed air is supplied from the air source 17 to the transmission device 3. The air is supplied to the second air chamber 9b.

When compressed air is supplied to the second air chamber 9b, the piston valve 6 begins to move in the connection direction, and the second air chamber 9b and the first exhaust hole 13a are slightly communicated via the first recess 14a.
Compressed air begins to leak and is supplied to the air motor 4 via the supply path 29 .

Subsequently, when the piston valve 6 moves and the second air chamber 9b and the first exhaust hole 13a completely communicate with each other and a large amount of ventilation begins, the air motor 4 begins to rotate at a low speed, while the starting rotation shaft 2 is rotated in the connection direction. As the air motor 4 rotates at a low speed, the starting rotating shaft 2 also rotates at a low speed, and a little later than the low speed rotation, the tip of the starting rotating shaft 2 comes into contact with the starting shaft of the internal combustion engine, and the involute spline The tips of No. 8 are rotated and engaged.

When the tips of the involute splines 8 engage, the first exhaust hole 13a is closed and the air motor 4 temporarily stops rotating.

The starting rotating shaft 2 continues to move in the connection direction, and when the involute spline 8 is almost completely engaged, the second air chamber 9b and the second exhaust hole 13b begin to communicate slightly through the second recess 14b, and the pilot line Pressure begins to be applied to the switching valve 25 via 25c.

Furthermore, when the piston valve 6 moves and the starting rotating shaft 2 completely meshes with the starting shaft of the internal combustion engine, and the second air chamber 9b and the second exhaust hole 13b are completely communicated with each other, the pilot line 25c is opened. Pressure is applied through the switching valve 25 and the supply section 25
Switch to b.

As a result, compressed air is supplied to the air motor 4 from the air supply path 22, causing it to rotate at high speed, and accordingly, the starting rotation shaft 2 also rotates at high speed to start the internal combustion engine.

When the internal combustion engine starts and the exhaust gas pressure reaches the set value, the pressure switch 33 is turned OFF, the solenoid 24 is stopped, the electromagnetic switching valve 23 is switched to the discharge part 23a, and the compressed air in the second air chamber 9b is discharged. is discharged, the piston valve 6 is moved in the direction of disconnection by the spring 10, and the starting rotating shaft 2 is also accordingly moved in the direction of disconnection, and the connection with the internal combustion engine is severed.

In addition, due to the discharge of compressed air from the second air chamber 9b, the switching valve 25
is switched to the stop portion 25a, and the rotational drive of the air motor 4 is stopped.

As described above, according to the present invention, since the starting rotating shaft of the transmission device is rotationally driven by the air motor, a large torque can be obtained.Furthermore, the starting rotating shaft is moved by the compressed air of the piston means and the air is supplied to the air motor. The air motor is configured to rotate at a low speed at the beginning of the connection operation of the starting rotating shaft, temporarily stop at the middle of the connection operation, and then rotate at high speed at the end of the connection operation by controlling the amount of compressed air used by the valve means. When connecting with the starting shaft of an internal combustion engine, no impact force is applied to the starting rotating shaft, and the connection can be made gently.

In addition, since the connection is gentle, high strength is not required.
Therefore, the durability of the transmission device is significantly improved, it can be made more compact, and the internal combustion engine can be started quickly and reliably, among other excellent effects.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the invention, in which FIG. 1 is a schematic illustration of an air-driven starting device and FIG. 2 is a longitudinal sectional view of a transmission device. DESCRIPTION OF SYMBOLS 1... Air drive starting device, 2... Starting rotating shaft, 3... Transmission device, 4... Air motor, 4a... Drive Shaft, 6... Piston valve, 9a... First air chamber, 9b...
...Second air chamber, 11...Air hole, 12...
...Piston means, 13a...First exhaust hole, 13b...Second exhaust hole, 14a...
First recess, 14b...Second recess, 15...
... Valve means, 16 ... Air control means, 23
...Solenoid switching valve, 25...Switching valve.

Claims (1)

[Claims] 1 A device in which an air motor that drives the starting rotation shaft is linked to a transmission device that moves the starting rotation shaft using compressed air supplied from an air source through an air control means and connects it to the starting shaft of an internal combustion engine. The starting rotation shaft is linked to the air motor so as to be movable back and forth in the axial direction, the air control means is connected to the transmission device, the transmission device includes a piston means and a valve means, and the piston means The piston valve, which divides the inside of the casing into a pair of air chambers and rotatably supports the starting rotating shaft, is moved forward and backward in the axial direction by compressed air supplied to one of the air chambers by an air control means. The valve means is configured to control the flow rate of compressed air supplied to the air motor by a pair of exhaust holes formed in the casing and a pair of corresponding recesses formed in the piston valve. The piston means and the valve means are related to each other, so that between an initial stage of the connecting operation in which the starting rotating shaft rotates at a low speed and a final stage of the connecting operation in which the starting rotating shaft rotates at a high speed. An air-driven starting device for an internal combustion engine, characterized in that the air supply to the air motor is cut off in the middle of the connection operation, and the rotation of the air motor is temporarily stopped.