JPH0643694Y2 - Eddy current type temperature / velocimeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an eddy current type temperature / velocimeter.

More specifically, it relates to the sensor main body of the eddy current temperature / velocimeter.

<Prior Art> FIG. 6 is a structural explanatory view of a conventional example generally used in the past, and FIG. 7 is a structural explanatory view of a main part of FIG.

In the figure, 1 is a sheath thermocouple, and 2 is a cylindrical eddy current sensor surrounding the peripheral surface of the sheath thermocouple 1.

Reference numeral 3 denotes a plurality of MI cables, one end of which is connected to the eddy current sensor and which is provided in parallel to the thermocouple 1 and radially around the thermocouple 1.

4 is a connector part.

Reference numeral 5 is a flexible tube that covers the sheath thermocouple 1 and the MI cable 3, one end of which is fixed to the sensor 2 by welding and the other end of which is fixed to the connector portion 4 by welding.

In the above configuration, the detection signals detected by the sheath thermocouple 1 and the sensor 2 are sent to the eddy current type temperature / velocimeter main body (not shown) to measure the temperature / velocity.

<Problems to be solved by the device> An eddy current type temperature / velocimeter is, for example, a cylindrical shape with a diameter of 120,
Moreover, since it can be made small, it is particularly suitable for use in measuring the temperature and flow velocity of a reactor coolant or the like.

In this case, the guide tube having a meandering pipe diameter of, for example, about 140, which is directed toward the core, is inserted by pushing. In this case, the total length is 13m.

Therefore, it is necessary to have a structure that can be easily inserted into a meandering guide tube.

Therefore, conventionally, the flexible tube 5 has been used.

However, in such a device, the flexible tube 5 is welded and fixed A to the sensor 2 at one end and to the connector portion 4 at the other end. Therefore, the flexible tube 5 cannot be reduced in radius of curvature due to welding restrictions at the joint with the sensor 2 or the connector portion 5, and in some cases, cannot be inserted into the guide tube.

Further, when it is used for measuring the temperature and flow velocity of a reactor coolant, the operating temperature is as high as 650 ° C. The eddy current sensor 2 has an excitation coil, an eddy current generating coil, and the like. The inside of the eddy current sensor 2 is vacuum degassed and an inert gas is sealed in order to prevent insulation deterioration and oxidation of the coil and the like. ing. After the flexible tube 5 is covered, the insulation characteristics may not be satisfied when the final inspection of the device is performed. In this case, since it is found in the final assembling process, it takes too much cost to disassemble and perform vacuum deaeration again, and the sensor body that does not satisfy the insulation characteristics is discarded. This adds to the cost of the product.

The present invention solves this problem.

It is an object of the present invention to provide an eddy current type temperature / velocimeter having a sensor main body which can be easily inserted into and removed from a guide tube and which can be manufactured at a low cost while satisfying an insulation characteristic.

<Means for Solving the Problems> In order to achieve this object, the present invention provides a sheath thermocouple, a cylindrical eddy current sensor provided around a peripheral surface of the sheath thermocouple, and the eddy current sensor. A plurality of MI cables, one end of which is connected to the current sensor and which are arranged radially in parallel to the thermocouple and centered around the thermocouple, and a required number of pillars through which the MI cables and the sheath thermocouple are freely movably penetrated And a fixing metal fitting provided on the sheath thermocouple for each at least one of the metal fittings to restrict the movement of the metal fittings, one end of which is connected to the inside of the cylindrical eddy current sensor and the other end of which is An eddy current type including a sensor main body including a sealing pipe that is locked to a stopper and that seals an inert gas inside the eddy current sensor after vacuum degassing the inside of the eddy current sensor. It consists of a temperature / velocimeter. .

<Operation> In the above configuration, the signal detected by the sensor is sent to the eddy current type temperature / velocimeter main body to detect the temperature / velocity.

Then, a required number of column-shaped fasteners through which the MI cable and the sheath thermocouple are freely movably penetrated, and a fastener provided on the sheath thermocouple for each at least one of the fasteners to restrict movement of the fasteners. Since the sensor main body is provided with, the sensor main body can be easily inserted into and removed from the guide tube.

Even if the insulation characteristics are not satisfied after the final inspection of the device, remove the other end of the sealing pipe from the stopper, unseal the other end, and re-vacuum the inside of the sensor. After degassing, the inert gas is resealed inside the eddy current sensor.

Hereinafter, detailed description will be given based on examples.

<Embodiment> FIG. 1 is an explanatory view of a main part configuration of an embodiment of the present invention.

In the figure, the same symbols as those in FIG. 6 represent the same functions.

Only parts different from FIG. 6 will be described below.

As shown in FIGS. 2 and 3, reference numeral 6 denotes a required number of columnar fasteners through which the MI cable 3 and the sheath thermocouple 1 are freely movably penetrated. The MI cable 3 is provided in parallel with the sheath thermocouple 1 and radially with the thermocouple as the center.

61 is provided on the stopper 6 as shown in FIG.
It is a through hole through which the cable 3 and the sheath thermocouple 1 freely move.

7 is at least one of the fasteners 6 as shown in FIG.
The fixing metal fittings are provided on the sheath thermocouple 1 for each piece and regulate the movement of the stopper metal fittings 6. In this case, 1 of the stopper 6
The sheath thermocouple 1 is provided on each side of the fastener 6 on each side.
It is spot welded to.

As shown in FIG. 5, reference numeral 8 indicates one end of the eddy current sensor 2 that is in communication with the inside of the cylindrical eddy current sensor 2 and the other end is locked by the stopper 6 to evacuate the inside of the eddy current sensor 2 after vacuum degassing. 2 is a sealing pipe for sealing the inside.

Reference numeral 62 is a locking hole provided in the stopper 6 as shown in FIG. 2 and in which the other end of the sealing pipe 8 is locked.

In the above configuration, the signal detected by the sensor 2 is
It is sent to the main body of the eddy current type temperature / velocimeter and the temperature / velocity is measured.

Then, the required number of column-shaped fasteners 7 through which the MI cable 4 and the sheath thermocouple 3 are freely moved, and the fasteners 7
Since at least one of them is configured with the fixing metal fittings 8 provided on the sheath thermocouple 3 and restricting the movement of the stopper metal fittings 7,
In order to make the cable 4 and the sheath thermocouple 3 easier to bend, they can be loosely bundled, and the minimum bending radius is the sensor 2
I was able to put together in a structure decided by.

Therefore, the sensor main body can be easily inserted into and removed from the protective tube.

Further, even if the insulation characteristic is not satisfied when the final detection of the device is performed, the other end of the sealing pipe 8 is removed from the stopper 6 to unseal the other end, and the inside of the sensor 2 is removed. After vacuum degassing, the inert gas is resealed inside the eddy current sensor. In this case, argon gas is used.

The other end of the sealing pipe 8 is resealed, and the other end of the sealing pipe 8 is locked in the stopper 6 locking hole 62.

As a result, when the final inspection of the device does not satisfy the insulation characteristics, there is no need to disassemble and perform vacuum deaeration again, and resealing may be performed using the sealing pipe 8, which is easy. I can.

Therefore, the sensor main body can be easily inserted into and removed from the protective tube, and can be inexpensive.

<Effects of the Invention> As described above, the present invention is an eddy current type temperature / velocimeter in which a sensor body is inserted into a guide tube, and a sheath thermocouple and a sheath thermocouple are provided so as to surround the sheath thermocouple. Cylindrical eddy current sensor, a plurality of MI cables which are connected to the eddy current sensor at one end thereof and are provided radially in parallel with the thermocouple centering around the thermocouple, the MI cable and the sheath thermocouple And a required number of column-shaped stoppers through which the stoppers are movably penetrated, a fixing member that is provided on the sheath thermocouple for at least one of the stoppers, and restricts the movement of the stoppers, and the cylindrical vortex. A sensor body having one end communicating with the inside of the current sensor and the other end locked by the stopper and vacuum-degassing the inside of the eddy current sensor and then sealing the inert gas inside the eddy current sensor. Characterized by having a section It was constructed an eddy current type temperature-current meter.

As a result, a required number of column-shaped fasteners through which the MI cable and the sheath thermocouple are freely movably penetrated, and a fastener provided on the sheath thermocouple for each at least one of the fasteners to restrict movement of the fasteners. The MI cable and the sheath thermocouple can be loosely bundled so that they can be bent easily, and the minimum bending radius can be combined into a structure determined by the sensor.

Therefore, the sensor main body can be easily inserted into and removed from the protective tube.

If the final inspection of the device does not satisfy the insulation characteristics, it is not necessary to disassemble and vacuum deaeration again, and resealing can be performed using a sealing pipe, which facilitates the work. I can.

Therefore, according to the present invention, it is possible to realize an eddy current type temperature / velocimeter having a sensor main body which can be easily inserted into and removed from the guide tube and which can satisfy the insulation characteristics and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is an explanatory view of the essential parts of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a front view of a fastener, and FIG. FIG.
(B) is a side view, FIG. 5 is an explanatory view of a sealing pipe, and FIG. 6 is an explanatory view of a configuration of a conventional example which is generally used in the past.
FIG. 7 is an explanatory diagram of a main part configuration of FIG. 1 ... Sheath thermocouple, 2 ... Eddy current sensor, 3 ... MI cable, 4 ... Connector part, 6 ... Stopper, 61 ... Through hole, 62 ...
Locking hole, 7 ... Fixing metal fitting, 8 ... Sealing pipe.

Claims (1)

[Scope of utility model registration request] 1. An eddy current type temperature / velocimeter in which a sensor body is inserted into a guide tube, a sheath thermocouple, and a cylindrical eddy current sensor provided around a peripheral surface of the sheath thermocouple. A plurality of MI cables, one end of which is connected to the eddy current sensor and which are provided radially in parallel with the thermocouple centering on the thermocouple, and the MI cable and the sheath thermocouple are pierced so as to be freely movable. A required number of fasteners, a fastener provided on the sheath thermocouple for each at least one of the fasteners, and a fixture for restricting movement of the fastener, one end of which communicates with the inside of the cylindrical eddy current sensor and the other end of which A vortex characterized in that the sensor main body is provided with a sealing pipe that is locked to the stopper and that degasses the inside of the eddy current sensor in vacuum and then seals an inert gas inside the eddy current sensor. Current type temperature / velocity meter.