JPS5833228Y2 - Mounting device for overcurrent prevention circuit breaker in small engine generator - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting device for an overcurrent prevention circuit breaker in a small engine generator.

In this type of engine generator, an overcurrent prevention circuit breaker is provided in the middle of the wiring from the generator to interrupt the circuit when an abnormally large amount of current flows.

By the way, the characteristics of the relationship between the overcurrent rate of this circuit breaker and the time it takes to disconnect it change depending on the temperature, so it is desirable to use it while maintaining a constant temperature. Since the circuit breaker is housed in an outer box together with the circuit breaker, when the engine generator is operated, the engine generates heat, which heats the circuit breaker, raising its temperature and changing its characteristics. .

In other words, as shown in Figure 2, the time it takes for a circuit breaker to interrupt current relative to the overcurrent ratio changes depending on the ambient temperature.For example, the upper curve shown in Figure 2 varies depending on the ambient temperature. shows the characteristics of the circuit breaker at 25°C, and the lower curve shows the characteristics of the same circuit breaker when the surrounding temperature is 60°C.

Therefore, if the temperature of the circuit breaker rises during use due to heat from the engine, etc., the current will be cut off in a short period of time at a value lower than the initially set value, that is, at a stage where the overcurrent rate is low. This will cause inconvenience.

The object of this invention is to provide a mounting device for an overcurrent prevention circuit breaker in a small engine generator that can eliminate the above-mentioned drawbacks.

In this invention, an outer box housing a generator and an engine that drives the generator is provided with a gripping part that has a hollow part formed in at least a part of the case, and a grip part that is connected to the generator in the hollow part is provided with a grip part that has a hollow part formed in at least a part of the outer box. It is characterized by the installation of a preventive circuit breaker.

Therefore, the circuit breaker is installed away from the engine, etc., which generates heat during operation, and is located inside the grip.Furthermore, since the engine is covered by an outer box, the heat from the engine, etc. is not transmitted through the circuit breaker. It is possible to keep the temperature of the circuit breaker constant and maintain its characteristics in a stable state to prevent deviations in the set current.Since the circuit breaker is installed in the hollow part of the grip, it is possible to keep the temperature of the circuit breaker constant and prevent the setting current from changing. This structure eliminates the need for additional space or mounting hardware.

An embodiment of this invention will be described based on the drawings.

Reference numeral 1 designates an outer box of an engine generator 2, and this outer box 1 houses an engine (not shown) and a generator (not shown) driven by the engine.

A handle 3, which is a gripping portion, is attached to the upper surface of the outer box 1.

The handle 3 has a hollow portion 4 formed therein.

A circuit breaker 5 for preventing overcurrent is installed in the hollow part 4, and this circuit breaker is connected to the wiring 6 passing through the hollow part 4.
is connected to the output terminal of the generator.

The upper surface of the circuit breaker 5 of the handle 3 is covered with a cover 7 attached to the upper part so as to be openable and closable.

In such a configuration, when the engine is started, the engine drives the generator to generate electricity.

The output terminal of this generator and a circuit breaker 5 for overcurrent prevention are connected by a wiring 6, and when a current exceeding a set value flows through this wiring 6, the circuit breaker 5 is disconnected.

By the way, the characteristics of this circuit breaker 5 change depending on the temperature, and as the temperature increases, the overcurrent rate is low and the circuit breaker 5 is shut off in a short period of time. Since the circuit breaker 5 is mounted on the circuit breaker 4 and separated from a heat source such as an engine, the temperature of the circuit breaker 5 can be kept constant and its characteristics can be kept in a stable state to prevent deviations in the set current.
The circuit breaker 5 is attached to the hollow part 4 of the handle 3, and furthermore, the wiring 6
Since the movement in the longitudinal direction is restricted, the trouble of creating a new space and mounting brackets for installing the circuit breaker 5 is saved, and since the wiring 6 is passed through the hollow part 4 of the handle 3, the appearance is not damaged. When inspecting or replacing the circuit breaker 5, this can be easily done by simply opening the cover 7 on the top of the handle.

In addition, in this embodiment, the output terminal of the generator and the circuit breaker 5
The wiring M6 that connects the two enters from the hollow part 4a on one side and comes out from the hollow part 4b on the opposite side. In addition, the hollow part 4 may be formed only in the part where the circuit breaker 5 is inserted, and the wiring 6 may be inserted from the outside of the handle 3 into the inside of the handle 3. If the circuit breaker is housed within 3, it will be easier to replace the circuit breaker.

Since this device is constructed as described above, the circuit breaker is placed away from heat generating elements such as engines to prevent the temperature from rising due to heating by these heat generating elements, and by keeping the temperature constant, the characteristics of the circuit breaker can be improved. The circuit breaker can be operated in a stable state to prevent deviations in the set current, and since the circuit breaker is inserted into the hollow part of the grip, new space and mounting hardware must be provided for installing the circuit breaker. This has the advantage that it can be easily installed without any problems.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, and FIG. 1 is a partially sectional side view, and FIG. 2 is a graph showing the characteristics of the circuit breaker. 1... Outer box, 3... Handle (gripping part),
4... Hollow part, 5... Circuit breaker.

Claims (1)

[Scope of utility model registration request] An outer box housing a generator and an engine that drives the generator therein is provided with a gripping part having a hollow part formed in at least a part thereof, and the hollow part is provided with a cutoff for preventing an overcurrent sustained in the generator. A mounting device for a circuit breaker for overcurrent prevention in a small engine generator, characterized in that a circuit breaker is mounted thereon.