JP2575440Y2 - Hydraulic equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic device for driving a hydraulic actuator, and more particularly, to oil temperature control of a hydraulic device.

[0002]

2. Description of the Related Art As a vibration damping device for suppressing vibration of a building due to an earthquake or the like, for example, a movable mass having a predetermined mass is arranged on the roof of a building, and at the time of an earthquake, the movable mass is driven by a hydraulic actuator. 2. Description of the Related Art There is known an active vibration damping device in which an inertial force of a movable mass acts on a building in a direction opposite to a vibration direction of the building.

[0003]

[Problems of the Invention] This vibration damping device is designed to operate simultaneously with the detection of the vibration of the building. At this time, if the temperature of the hydraulic oil driving the hydraulic actuator is low, the viscosity of the hydraulic oil increases. In addition, there is a risk that the movable mass cannot be driven with favorable responsiveness. For this reason, the temperature of the hydraulic oil has to be kept within a certain range even in the non-operating state.

[0004] To raise the oil temperature, the hydraulic pump may be preliminarily warmed up or the tank may be heated by a heater.

However, in the case of a vibration damping device for coping with sudden vibration, there is not enough time to perform a warm-up operation, and if the tank is constantly heated by a heater, the hydraulic oil is locally heated. There was a problem that it was easily deteriorated. When using a heater, special consideration for fire prevention was also required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to appropriately maintain the oil temperature of a hydraulic device with a simple configuration without using a heater.

The present invention is provided in a vibration damping device for damping a building by driving a movable mass by an actuator, and a tank for storing hydraulic oil, and a hydraulic pump for pressurizing the hydraulic oil in the tank and supplying it to the actuator. And a means for detecting the oil temperature of the tank, wherein the operation mode of the hydraulic pump is provided with an oil temperature maintaining mode for operating the actuator at a low speed that does not vibrate the building. Means for operating the hydraulic pump in the oil temperature maintaining mode when the oil temperature detected by the oil temperature detecting device falls below a set value.

In the present invention, at the time of vibration control by the vibration control device,
While the actuator supplied with hydraulic oil from the hydraulic pump vibrates the movable mass to control the building, the oil temperature detected by the oil temperature detection device falls below the set value when the vibration control device does not control vibration By operating the hydraulic pump in the hydraulic pressure maintaining mode in which the movable mass does not vibrate the building, the oil temperature is raised while preventing unnecessary vibration from occurring in the building.

Therefore, the oil temperature can always be maintained in a preferable range without constantly operating the hydraulic pump.

[0010]

1 to 3 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a variable displacement hydraulic pump for supplying discharge oil to a vibration damping device (not shown) supplied as a separate unit.

The vibration damping device includes an actuator for driving the movable mass, a vibration sensor for detecting vibration, an electromagnetic valve for connecting the hydraulic pump 1 and the tank 7 to the actuator, and a controller for controlling the electromagnetic valve.

Thus, when the vibration sensor detects the vibration, the controller supplies the oil discharged from the hydraulic pump 1 to the actuator via the electromagnetic valve, and drives the actuator to move the movable mass.

The hydraulic pump 1 has a regulator 2 for changing the tilt angle according to the discharge pressure so that the discharge pressure is kept constant.
Is provided.

The operation of the hydraulic pump 1 is performed by the rotation of a motor 3. The motor 3 is rotated by electric power supplied from the power supply unit 4.

The power supply unit 4 is connected to a timer 5 as operating means of the hydraulic pump 1 and supplies electric power to the motor 3 according to an input signal from the timer 5.

A temperature switch 6 is provided as an oil temperature detecting means in a tank 7 for supplying the working oil for suction to the hydraulic pump 1. The temperature switch 6 is connected to the timer 5, and when the temperature of the hydraulic oil in the tank 7 falls below a set value, the timer 5
Start.

The timer 5 outputs a signal to the power supply unit 4 for a set time after the start, and the power supply unit 4 supplies power to the motor 3 for the signal output time.

The controller of the vibration suppression device is set to a vibration suppression mode in which the actuator is driven by the discharge oil of the hydraulic pump 1 and an oil temperature maintenance mode in which the hydraulic pump 1 is operated to maintain the oil temperature. The controller enters the oil temperature maintaining mode only when the building does not require vibration damping operation and the timer 5 is operated. In the oil temperature maintaining mode, the controller is driven very slowly so that the movable mass does not vibrate the building. To control the solenoid valve.

Next, the operation will be described.

If the temperature of the hydraulic oil in the tank 7 is equal to or higher than the set value when the vibration damping device is not operating, that is, in a standby state, power is not supplied to the motor 3 and the hydraulic pump 1 is stopped.

When the oil temperature of the tank 7 falls below the set value,
The temperature switch 6 is turned on, and the timer 5 starts outputting a signal to the power supply unit 4.

Accordingly, the power supply unit 4 supplies power to the motor 3, and the motor 3 rotates to start the operation of the hydraulic pump 1. The hydraulic pump 1 sucks the hydraulic oil in the tank 7 and discharges it while pressurizing, and raises the temperature of the hydraulic oil during the pressurization process.

On the other hand, when the timer 5 is started, the controller of the vibration damping device enters the oil temperature maintaining mode, and the actuator is operated at an extremely low speed by the oil discharged from the hydraulic pump 1.

As a result, the discharge oil of the hydraulic pump 1 whose temperature has risen circulates through the solenoid valve and the actuator and returns to the tank 7, and the temperature of the hydraulic oil in the whole vibration damping device is evenly raised. Further, energy loss during circulation generates heat and raises the temperature of the circulating hydraulic oil.

When the set time has elapsed, the timer 5 stops outputting the signal to the power supply unit 4, the power supply from the power supply unit 4 to the motor 3 is stopped, and the operation of the hydraulic pump 1 is also stopped.

In this way, when the temperature of the hydraulic oil in the tank 7 drops below the set value in the standby state of the vibration damping device, the hydraulic pump 1 is operated for a certain period of time to circulate the hydraulic oil while raising the hydraulic oil temperature. The hydraulic oil is always maintained at a temperature at which a favorable response can be obtained, and the vibration damping device can immediately drive the movable mass when the vibration damping operation is required.

In this embodiment, the actuator is driven at a low speed in the oil temperature maintaining mode.
Even when the controller switches the solenoid valve to the tank 7 so that the entire amount of the oil discharged from the hydraulic pump 1 is returned to the tank 7, the oil temperature can be increased.

Alternatively, the controller may control the solenoid valve in the same manner as in the vibration control operation, or may control the solenoid valve so that the actuator maintains the neutral position.

FIG. 2 shows another embodiment, in which a timer 5 is not provided and a two-contact type temperature switch 6 serves both as the temperature detecting means and the operating means of the hydraulic pump 1. That is,
The temperature switch 6 is turned on when the oil temperature falls below the set lower limit temperature, and energizes the motor 3 via the power supply unit 4. When the oil temperature exceeds the set upper limit temperature, the temperature switch 6 is turned off to stop this energization. . According to this configuration, the oil temperature of the vibration damping device in the standby state can be more finely controlled.

FIG. 3 shows still another embodiment, in which a hydraulic pump 1 is constituted by a fixed displacement pump, and a relief valve 1 for returning a discharge oil exceeding a certain pressure to a tank 7 at a discharge port.
3 are provided. As described above, the present invention can be applied regardless of the type of the hydraulic pump 1.

As described above, in the present invention, when the oil temperature detected by the oil temperature detecting device falls below the set value during non-vibration control by the vibration damping device, the hydraulic pump is operated by the movable mass. Even when the actuator is not used for the vibration damping operation by the vibration damping device, the hydraulic oil in the tank can always be kept at a certain temperature or higher, and the response at the time of starting the actuator can be improved with a simple configuration. In addition, the operation of the hydraulic pump for maintaining the oil temperature of the tank is performed in the hydraulic pressure maintaining mode in which the building is not vibrated, so that unnecessary vibration is not given to the building.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a hydraulic device showing an embodiment of the present invention.

FIG. 2 is a circuit diagram of a hydraulic device showing another embodiment.

FIG. 3 is a circuit diagram of a hydraulic device showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic pump 3 Motor 4 Power supply unit 5 Timer 6 Temperature switch 7 Tank

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F15B 21/04 E04H 9/02 341 F16F 15/02

Claims (1)

(57) [Scope of request for utility model registration] A movable mass is driven by an actuator.
A hydraulic device that is provided in a vibration control device that performs vibration control of a building, and includes a tank that stores hydraulic oil, and a hydraulic pump that pressurizes hydraulic oil in the tank and supplies the hydraulic oil to an actuator.
Low speed that does not excite the building in the operating mode of the hydraulic pump
A means for detecting the oil temperature of the tank, and a means for detecting the oil temperature of the tank. When the oil temperature detected by the oil temperature detection device falls below the set value during non-vibration control by the vibration damping device , Means for operating a pump in the oil temperature maintaining mode .