JP2603565B2 - Power supply circuit of electric pump for cooling engine of engine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit for an electric pump for cooling an engine of an engine generator.

[0002]

[Premise structure] The power supply circuit of the electric pump for cooling the engine of the engine generator according to the present invention, as shown in FIG.
An electric pump 6 for cooling the engine is connected to the generator 3 of the engine generator 1 via the breaker 4 and the magnet switch 5 in order, and an engine stop command terminal 7a of the control device 7 of the engine generator 1 is connected to the It is assumed that the engine has a prerequisite structure that is connected to the stop device 8 of the engine 2 so as to be able to output.

[0003]

2. Description of the Related Art In the above prior art, in the prior art, as shown in FIG.
If there is any abnormality, the stop device 8 is operated from the terminals 7d and 7e in the control device 7 via the engine stop command terminal 7a via the central processing unit 9 to stop the operation of the engine 2. Was. Then, even if the breaker 4 is turned off for some reason and the magnet switch 5 is automatically turned off to stop the engine cooling electric pump 6, the operation of the engine 2 is not stopped.

[0004]

The above prior art has the following problems. During the operation of the engine generator 1,
Even if the circuit breaker 4 is turned off due to a short circuit or an error in manual operation, the stop device 8 operates unless an engine stop command is output from the central processing unit 9 in the control device 7 to the engine stop command terminal 7a. No, the engine 2 keeps running. Then, in this case, the magnet switch 5 is automatically turned off when the breaker 4 is turned off, so that the engine cooling electric pump 6 remains stopped. As a result, the temperature of the engine cooling water rises and seizure of the engine 2 occurs. According to the present invention, when the breaker 4 and the magnet switch 5 are turned off and the engine cooling electric pump 6 is stopped, the operation of the engine 2 is automatically stopped with a simple configuration to prevent the engine 2 from burning. Make things an issue.

[0005]

According to the present invention, in order to achieve the above-mentioned object, the above-mentioned prerequisite structure has the following characteristic structure as shown in FIG. That is, the auxiliary contact 5b of the magnet switch 5 is receivably connected to the pump stop detection terminal 7b of the control device 7, and based on the main contact 5a of the magnet switch 5 being turned off, the auxiliary contact 5b is turned off. The engine 2 is stopped by operating the engine stop device 8 via the pump stop detection terminal 7b, the control device 7, and the engine stop command terminal 7a.

[0006]

As described above, the present invention has the following advantages. (B) When the circuit breaker 4 is turned off and the magnet switch 5 is automatically turned off due to an abnormal operation / abnormal operation due to a short circuit or a manual operation error, the engine cooling electric pump 6 is stopped. An engine automatic stop signal is output to the engine stop device 8 via the device 7, and the engine 2 is automatically stopped. This prevents engine burn-in. (B) When the breaker 4 is turned off and the magnet switch 5 is automatically turned off and the engine cooling electric pump 6 is stopped, the existing auxiliary contact 5 of the magnet switch 5 is turned off.
b, the pump stop detection terminal 7b of the control device 7 receives the signal, and outputs an engine automatic stop signal to the engine stop command terminal 7a.
, It is possible to easily configure a circuit without using new components.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a power supply circuit diagram of an engine cooling electric pump of an engine generator. In the figure, an electric pump 6 for cooling an engine is connected to a power generation output line U, V, W of a generator 3 of an engine generator 1 via a breaker 4 and a magnet switch 5 in that order. Further, an engine stop command terminal 7a of the control device 7 of the engine generator 1
It is connected to a stop device 8 of the engine 2 so as to be able to output. The existing auxiliary contact 5b of the magnet switch 5
Is connected to the pump stop detection terminal 7b of the control device 7.
And the other end of the auxiliary contact 5b is grounded. Further, the thermal relay contact 5c of the magnet switch 5 has its make contact connected to the overcurrent detection input terminal 7c of the control device 7, and its common contact is grounded. Each terminal of the control device 7
Each signal is connected to a corresponding terminal of the central processing unit 9 in the control device 7 and signals are input / output according to the operation of the central processing unit 9. When the main contact 5a of the magnet switch 5 is turned off, the auxiliary contact 5b is turned off, and the central processing unit 9 in the control device 7 is connected to the engine via the pump stop detection terminal 7b. The stop of the electric cooling pump 6 is detected. further,
The central processing unit 9 is configured to stop the engine 2 by operating the engine stop device 8 via the engine stop command terminal 7a.

In the above-described embodiment, the other end of the auxiliary contact 5b of the magnet switch 5 is directly grounded. It is also possible to operate the central processing unit 9 by applying a potential. Further, the liquid crystal display 10 for displaying the control state of the control device 7 includes:
The contrast of the display may change depending on the ambient temperature, making it difficult to see. In such a case, in the related art, the brightness adjustment volume 10a of the liquid crystal display 10 is manually adjusted. In the embodiment of the present invention, the brightness adjusting volume 10a is electrically driven, the ambient temperature detected by the temperature sensor 10b is input to the temperature detecting terminal 7f of the control device 7, and the volume motor 10c is driven from the motor driving terminal 7g. Thus, the display contrast is automatically adjusted. In addition, this brightness adjustment volume 10a or
Electric brightness control volume 10a and temperature sensor 10b
In addition, instead of the volume motor 10c, a temperature-resistance variable element such as a thermistor may be used for automatic adjustment.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is a power supply circuit diagram of an electric pump for cooling an engine of an engine generator.

FIG. 2 shows a conventional example and is a diagram corresponding to FIG.

[Description of Signs] 1 ... Engine generator, 2 ... Engine, 3 ... Generator, 4 ...
Breaker, 5: magnet switch, 5a: main contact, 5b: auxiliary contact, 6: electric pump for engine cooling,
7: control device, 7a: engine stop command terminal, 7b: pump stop detection terminal, 8: stop device.

Claims (1)

(57) [Claims] An electric pump (6) for cooling an engine is connected to a generator (3) of an engine generator (1) via a breaker (4) and a magnet switch (5) in this order so as to be able to supply power. An engine cooling electric pump for an engine generator is constructed by connecting an engine stop command terminal (7a) of a control device (7) of a generator (1) to a stop device (8) of an engine (2) so as to be able to output. In the power supply circuit, the magnet switch
The auxiliary contact (5b) of (5) is receivably connected to the pump stop detection terminal (7b) of the control device (7), and based on the fact that the main contact (5a) of the magnet switch (5) is turned off,
The auxiliary contact (5b) is turned off, and the engine stop device (8) is operated via the pump stop detection terminal (7b), the control device (7), and the engine stop command terminal (7a). A power supply circuit for an engine-cooling electric pump of an engine generator, wherein the power supply circuit is configured to stop the engine (2).