JPS632039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power failure protection device that allows a load driven by an electric motor to be continuously driven even during a power outage.

Conventionally, uninterruptible power supplies including storage batteries and the like have been used to drive electric motors even during power outages. Such uninterruptible power supplies have complex configurations, require maintenance and inspection, require highly specialized technology to handle them, require a large installation space, and have high equipment costs. be.

A certain prior art to solve this problem is
−5460. In this prior art, a compressed air prime mover is connected to the rotating shaft of an electric oil supply device,
A compressed air cylinder is connected to this via piping. In this way, even during a power outage, refueling can be carried out using compressed air without any problems. In this prior art, when a power outage occurs, it is necessary for an operator to perform an operation to supply compressed air from a compressed air cylinder to a compressed air prime mover. Therefore, when a power outage occurs, the refueling operation will be temporarily stopped. Furthermore, in this prior art, the compressed air prime mover is always connected to the rotating shaft of the electric oil supply system, so while the electric oil supply system is in operation, the compressed air prime mover acts as a load, increasing the load on the electric oil supply system. Become.

SUMMARY OF THE INVENTION An object of the present invention is to provide a power failure protection device that can continuously drive a load without temporarily stopping operation even if a power failure occurs, and can reduce power consumption. It is.

The present invention provides: a load having an input shaft; an electric motor having an output shaft fixedly connected to the input shaft of the load; a pneumatic pressure source; a pneumatic motor having an output shaft; and the input shaft of the load. An electromagnetic clutch is interposed between the output shaft of the gas pressure motor and is cut off when the power is energized, and connected when the power is turned off during a power outage. This is a power outage protection device characterized by including an electromagnetic valve interposed between the two and the electromagnetic valve, which is closed when energized with electric power, and which is opened when power is turned off during a power outage.

The present invention also provides: a load having an input shaft; an electric motor having an output shaft fixedly connected to the input shaft of the load; a gas pressure source; a gas pressure motor having an output shaft; a gas pressure source and a gas A solenoid valve is interposed between the pneumatic motor and the solenoid valve, which is closed when energized by electric power, and opened when the power is turned off during a power outage, and a solenoid valve that connects the output shaft of the pneumatic motor to the load. A one-way clutch that applies to the input shaft of the power failure protection device.

FIG. 1 is a system diagram of one embodiment of the present invention.
A load such as a calorimeter 2 is driven by the electric motor 1 . This load is driven by a small driving force such as a spectrometer or measuring device in the field of chemistry or physics, and in this example,
This is a calorimeter 2 that measures the calorific value of fuel gas. In this calorimeter 2, the rotating shafts of two constant displacement pumps 3 and 4 are directly connected coaxially. One constant displacement pump 3 is supplied with fuel gas whose calorific value is to be measured from a conduit 5. Combustion air is supplied to the other constant displacement pump 4 from a conduit 6. The fuel gas and combustion air from the constant displacement pumps 3 and 4 are supplied to the burner 7 and burned. The temperature of this combustion gas is measured by a thermometer 8. The calorific value of the fuel gas is calculated and measured based on the combustion temperature of the fuel gas measured by the thermometer 8, the temperature and flow rate when the fuel gas is supplied, and the temperature and flow rate when the combustion air is supplied. An input shaft 9 of the calorimeter 2 is fixedly connected to an output shaft 10 of the electric motor 1. The electric motor 1 is connected to a power source 12 via an electromagnetic switch 11 interposed in a power line 30.

The compressor 13 is energized by the power from the power source 12, and compressed air is stored in the accumulator 14. The compressed air from the accumulator 14 is
Used to drive various pneumatic equipment in factories. Further, compressed air from the accumulator 14 is supplied to the gas pressure motor 18 from a conduit 15 via a pressure regulating valve 16 and a solenoid valve 17. On the downstream side of the compressed air solenoid valve 17, that is, on the gas pressure motor 18 side, the pneumatic motor 1
8, lubricating oil from a lubricating oil source 19 is mixed into the compressed air. The output shaft 20 of the pneumatic motor 18 is connected to the free end 22 of the output shaft 10 of the electric motor 1 via an electromagnetic clutch 21, whereby the output shaft 20 of the pneumatic motor 18 is connected to the free end 22 of the output shaft 10 of the motor 1.
Power is transmitted to the input shaft 9 of the calorimeter 2 via the electromagnetic clutch 21.

The solenoid valve 17 is configured to be in a closed state when it is energized by power energization, and to be in an open state when it is demagnetized by power deenergization during a power outage.
Such a solenoid valve 17 may have the configuration shown in FIG. In the electromagnetic valve 17, a valve body 25 is provided on the valve seat 24 of the valve body 23 so as to be freely displaceable so as to be seated or separated. A valve rod 26 that is integrally fixed to this valve body 25 is attached to the valve body 25 by a spring 27.
5 is separated from the valve seat 24 and is biased by a spring so that the valve is in the open state. A plunger 28 made of a ferromagnetic material is fixed to the valve stem 26, and when the excitation coil 29 is energized by electric power, the plunger 28 resists the spring force of the spring 27 and moves the valve stem 26 and the valve body 25. is displaced downward in FIG. 2, and the valve body 25 is seated on the valve seat 24.

The electromagnetic clutch 21 is configured to be in a disconnected state when the power is energized, and to be in the connected state when the power is turned off during a power outage. Such an electromagnetic clutch 21
The construction of is well known to those skilled in the art.

A voltage detection circuit 31 is connected to the power supply 12 side of the power line 30 with respect to the electromagnetic switch 11 .
This voltage detection circuit 31 detects whether or not power is being supplied to the power line 30, that is, whether or not the power supply 12 is out of power. The control circuit 32 is
When the power supply 12 is not out of power, the electromagnetic switch 1
1 is made conductive to energize the electric motor 1, the solenoid valve 17 is energized to keep it closed, and the electromagnetic clutch 21 is energized to keep it closed. Power supply 1
2, when a power outage occurs, the control circuit 32 responds to the output from the voltage detection circuit 31, demagnetizes the electromagnetic switch 11 to shut it off, and deenergizes the electromagnetic valve 17 to open it. The valve state is maintained, and the electromagnetic clutch 21 is deenergized to maintain the connected state. When the power supply 12 is restored after a power outage, the control circuit 32 shuts off the electromagnetic clutch 21 in response to the output from the voltage detection circuit 31, and also closes the electromagnetic valve 17.
is cut off, and then the electromagnetic switch 11 is excited to make it conductive.

When the power supply 12 is not experiencing a power outage, the electromagnetic switch 11 is excited and conductive, so that power is supplied from the power supply 12 to the motor 1 via the power line 30 and the electromagnetic switch 11. By this electric motor 1, a constant displacement pump 3 of a calorimeter 2,
4 is driven, and the calorimeter 2 is activated. At this time, the solenoid valve 17 and the solenoid clutch 21 are energized, so the solenoid valve 17 is closed, and the pneumatic motor 18 is stopped because the solenoid clutch 21 is disconnected. The compressor 13 stores compressed air in an accumulator 14, making it possible to use the compressed air within the factory.

When a power outage occurs, the electromagnetic switch 11 is demagnetized and shut off, and the electromagnetic valve 17 and the electromagnetic clutch 21 are deenergized. Therefore, the solenoid valve 17
When the valve is opened, compressed air from the accumulator 14 is supplied to the gas pressure motor 18 through the pipe line 15, and the gas pressure motor 18 is driven. The driving force from the output shaft 20 of the pneumatic motor 18 is transferred from the connected electromagnetic clutch 21 to the output shaft 10 of the electric motor 1.
is applied to the input shaft 9 of the calorimeter 2 via. In this manner, the operation of the calorimeter 2 is continued by the gas pressure motor 18 during a power outage.

When the power supply 12 is restored, the electromagnetic valve 17 is first excited and closed, and the rotational speed of the gas pressure motor 18 is therefore reduced. Simultaneously with the return of the power source 12, the electromagnetic clutch 21 is energized and becomes cut off. Thereafter, the electromagnetic switch 11 is excited and conductive, and the motor 1 is driven. After the power is restored in this way, the operation of the calorimeter 2 is continued by the electric motor 1 again. In this way, after power is restored,
First, the power from the gas pressure motor 18 is not applied to the electric motor 1, and then after a predetermined time has elapsed, the electric motor 1 reaches the rated speed or less and is energized.
operation as a generator is reliably prevented by the power of the electric motor 1 or by the inertia of the electric motor 1. Therefore, the electric motor 1 becomes a generator, and the power line 30
This can reliably prevent the voltage, frequency, etc. of the power source 12 from becoming unstable and adversely affecting other loads in the factory connected to the power source 12.

In another embodiment of the present invention, the opening degree of the solenoid valve 17 is gradually reduced after the power supply 12 is restored, and at this time, the solenoid clutch 21 is kept connected only for a short time after the power supply 12 is restored, and the calorimeter The second input shaft 9 may be prevented from reaching an undesirably low speed and continue to rotate.

In yet another embodiment of the present invention, a one-way clutch may be used instead of the electromagnetic clutch 21. Using this one-way clutch, power is transmitted from the output shaft 20 to the free end 22 only when the output shaft 20 of the pneumatic motor 18 has a higher speed than the free end 22 of the output shaft 10 of the electric motor 1. When the electric motor 1 has a higher speed than the pneumatic motor 18, power is not transmitted from the electric motor 1 to the pneumatic motor 18. Such a one-way clutch is advantageous in that it requires no electrical power.

In the illustrated embodiment, compressed air stored in the accumulator 14 by the compressor 13 is used as the gas pressure source, but a cylinder of compressed nitrogen gas or the like may also be used, and the high pressure gas stored in this cylinder may be used. It can also be used.

As described above, according to the present invention, compressed air is supplied from the gas pressure source to the gas pressure motor to drive the load during a power outage, so the configuration is simple and compact, and maintenance and inspection are easy. It also has excellent effects, such as not requiring any high level of specialized knowledge regarding driving etc.

Particularly, in the present invention, an electromagnetic clutch is interposed between the input shaft of the load and the output shaft of the gas pressure motor, and this electromagnetic clutch is deenergized and connected during a power outage, and also connects the gas pressure source and the gas pressure motor. A solenoid valve is interposed between the two, and this solenoid valve becomes open when power is turned off during a power outage. Therefore, when a power outage occurs, compressed gas is supplied from the gas pressure source to the gas pressure motor via the solenoid valve, and the gas pressure motor is driven.
At this time, the electromagnetic clutch becomes connected due to the power outage, so even if a power outage occurs, operation can continue, and the load will not be temporarily stopped when a power outage occurs.

When there is no power outage and the motor is running, the electromagnetic clutch is energized and in the cutoff state, so the pneumatic motor does not become a load on the motor, reducing power consumption. It is possible to reduce the

In addition, in the present invention, the power from the output shaft of the pneumatic motor is applied to the input shaft of the load via the one-way clutch, so that the pneumatic motor is not driven while the electric motor is in operation. As a result, the load on the motor does not increase, and power consumption can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram of an embodiment of the present invention, and FIG. 2 is a simplified sectional view of a solenoid valve 17. 1...Electric motor, 2...Calorimeter, 9...Input shaft, 10,
20... Output shaft, 11... Electromagnetic switch, 12... Power supply, 13... Compressor, 14... Accumulator, 17
... Solenoid valve, 18 ... Gas pressure motor, 21 ... Electromagnetic clutch, 31 ... Voltage detection circuit, 32 ... Control circuit.

Claims (1)

[Scope of Claims] 1. A load having an input shaft, an electric motor having an output shaft fixedly connected to the input shaft of the load, a pneumatic pressure source, a pneumatic motor having an output shaft, and the load having an output shaft. An electromagnetic clutch is interposed between the input shaft and the output shaft of the gas pressure motor, and is cut off when the power is energized, and connected when the power is turned off during a power outage. A power outage protection device comprising: a solenoid valve interposed between the motor and the solenoid valve that is closed when energized with electric power and opened when the power is turned off during a power outage. 2. A load having an input shaft, an electric motor having an output shaft fixedly connected to the input shaft of the load, a pneumatic pressure source, a pneumatic motor having an output shaft, and a pneumatic pressure source and a pneumatic motor. A solenoid valve is interposed between the valve and the valve, which is closed when the power is energized, and is opened when the power is turned off during a power outage. and a one-way clutch that provides power.