JPH0241531Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention houses the inner sphere in a semiconducting liquid inside the outer sphere,
This invention relates to a type of gyroscope compass that is suspended in the center of an inner sphere by a rising liquid flow from the bottom of the outer sphere. More specifically, the present invention relates to a structure that can efficiently control the temperature of the semiconductive liquid.

(Prior Art) The liquid (semi-conductive) for levitating the inner sphere must be maintained at a constant temperature in order to ensure the azimuth accuracy of the gyro compass. For example, when the ambient temperature is 25°C, it is maintained at about 50±2°C.
Conventionally, the following various methods have been tried for this purpose, but each method has its own drawbacks.

1 The method uses a structure in which multiple small lamps are arranged in a circumferential manner below the outer bulb, and the outer bulb is heated with radiant heat from the lamps (about 100W in total), and a fan installed below the outer bulb is used for cooling. is simple, but has the drawbacks of extremely poor heating efficiency and short lamp life.

2. The method of embedding the heater in the wall of the outer bulb is efficient, but has the disadvantage that the outer bulb cracks due to thermal stress.

3 The method of placing the heater directly into the conductive liquid is the most efficient, but it is difficult to insulate, and
It also has the disadvantage that it is difficult to replace when the wire breaks.

(Structure of the present invention) In the present invention, the bottom of the outer sphere is constructed of a metal plate, and this will be explained in detail next.

In FIG. 1, numeral 1 is an inner sphere housing a gyroscope, and numerals 2 and 3 are upper and lower electrodes provided for supplying power to the gyroscope (not shown). 4 is the outer sphere, which is molded from plastic material. A saucer portion 5 having a diameter slightly larger than that of the inner sphere is formed at the bottom of the outer sphere. The center of the bottom of the saucer portion 5 is open, and a pump 7 is disposed to provide an upward flow to a conductive plate 6 filled in the outer sphere. The bottom opening of the outer sphere 4 is closed with a metal plate (for example, aluminum) 8. The contact surface of the metal plate 8 with the conductive liquid 6 is covered with an insulating resin film. A heating element (for example, a transistor or a posistor) 10 is attached to the outer wall of the metal plate, and a temperature measuring posistor 11 is also fixed to the same plate. A blower fan (for cooling) 12 is provided below the heating element 10 .

FIG. 2 is an electrical wiring diagram for controlling the device shown in FIG. The collector of the heating transistor 10 is grounded via a slip ring contact 13, and the emitter is connected to a power supply terminal 16 via a resistor _R2 via a slip ring contact 14 and a current amount detection circuit 15. The base of transistor 10 is connected to contact 13 of the slip ring via a resistor R ₁ . The base is also grounded via POSISTOR RT. Further, a series circuit of a cooling fan 12 and a transistor 17 is connected between the power source and ground, and its base is connected to the output terminal of the current amount detection circuit 15.

In the above device, when overheating, transistor 1
0 is turned on, and the metal plate 8 is heated by the collector loss heat. Heat is transferred to the semiconductive liquid 6, but since the metal plate 8 is in direct contact with the semiconductive liquid,
The efficiency is high, and since the liquid is circulated by the pump 7, the liquid is heated uniformly. In particular, since the heating element is placed directly under the fan 7 to heat the liquid, thermal efficiency is very high. During this time, the transistor 17 is turned off because the amount of current flowing through the current amount detection circuit 15 is larger than the set value, and the cooling fan 12 is not driven.

Now, when the liquid temperature rises and exceeds the Curie point (set temperature) of POSISTOR RT, the resistance value of POSISTOR RT increases rapidly, and the base potential of transistor 10 approaches the emitter potential and turns off. at the same time,
When the current flowing through the current amount detection circuit 15 decreases and exceeds a set value, the transistor 17 is turned on and the cooling fan 12 is driven. The metal plate 8 is cooled by the cold air, and the cooling liquid circulates as in the case of heating.
The semiconducting liquid 6 is uniformly cooled. When the metal plate 8 is cooled and the resistance of the POSISTOR RT becomes smaller and exceeds a set value, the transistor 10 is turned on and returns to its original state. Heating and cooling are repeated in this manner to maintain the semiconductive liquid at a predetermined temperature.

In the embodiment, a positor is used as the sensor, but a thermistor may also be used, and in this case, the polarity of the transistor may be reversed.

Furthermore, when a posistor is used instead of the heating transistor (R ₁ , R ₂ RT, 10 in FIG. 2 are replaced with a posistor), the following effects can be obtained. In the case of a liquid type gyro, which is the subject of this proposal, replenishment is unavoidable as the liquid evaporates, but if it is accidentally left in an empty state or the cooling fan has a disconnection failure, abnormalities may occur. Although there is a risk of high temperatures, the resistance of POSISTOR takes a positive value with respect to temperature, so it has the advantage of automatically maintaining the circuit on the safe side and avoiding dangers such as fire.

As mentioned above, according to the present invention, the heating and cooling body is made of metal and brought into direct contact with the semiconductive liquid, and its position is directly below the liquid circulation pump fan.
The cooling efficiency can be improved approximately five times compared to the conventional lamp method, and practical effects such as high azimuth accuracy and easy maintenance can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG. 2 is an electrical wiring diagram showing an example of use of FIG. 1.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a type of gyroscope compass device in which an inner bulb is housed in a semiconductive liquid inside an outer bulb and the inner bulb is suspended in the center of the outer bulb by a liquid flow rising from the bottom of the outer bulb. , the bottom of the outer sphere is formed of a metal plate, the pump for generating the liquid flow is arranged above the metal plate, the contact surface of the metal plate with the semiconductive liquid is coated with an insulating material, and the metal plate is A gyro compass device comprising a heating element fixed to an outer wall and a cooling air generator disposed below the metal plate to cool the metal plate. 2. Claim 1, wherein the heating element comprises an element whose resistance increases in proportion to temperature.
The gyro compass device described in Section 1.