JP2008196904A - Bridge adaptor for capsule type high temperature strain gauge and cable connecting structure for capsule type high temperature strain gauge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge adaptor which has a simple structure, can be easily installed in a sealed part, can reduce execution mandays for installation, and can prevent erroneous wiring effectively as well. <P>SOLUTION: To a sensor unit 1, a metal-coated cable 2 is connected, and the metal-coated cable 2 is connected to a flexible cable 4 with the bridge adaptor 3 having a cable connecting function. In the metal-coated cable 2 as a heat-resisting cable, a signal wire is insulated from a metal coating by filling up the inside of a heat-resisting tubular metal coating with an inorganic insulator along with enclosing the signal wire inside the metal coating, like an MI cable. A pair of lead wire temperature compensating resistors different in polarity are arranged side by side in parallel and being inclined against the direction of a column made up of gauge temperature compensating resistors, bridge balance compensating resistors, and Wheatstone bridge forming resistors, to reduce the dimension of packaging in a crosswise direction of a bridge adaptor board. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bridge adapter connected to a capsule-type high-temperature strain gauge in which a strain gauge is enclosed in a metal tube, and a cable connection structure of the capsule-type high-temperature strain gauge.

  A strain gauge, particularly a capsule strain gauge in which a strain gauge is enclosed in a metal tube, is often used in combination with a bridge adapter that constitutes a Wheatstone bridge circuit and has a resistance for temperature compensation. This bridge adapter is configured by mounting, on a wiring board, a resistance for bridging constituting a Wheatstone bridge circuit necessary for strain measurement together with a strain gauge, and a resistance for temperature compensation for correcting an apparent strain due to temperature. The bridge adapter is used in such a manner that a strain gauge is connected to a predetermined position of the wiring board, a power input is supplied to the predetermined position of the wiring board, and a signal output is taken out from the predetermined position of the wiring board. This bridge adapter is connected to a flexible cable connected to a metal-coated cable, which is a heat-resistant cable, via a connecting portion.

  That is, as shown in FIG. 10, a metal-coated cable 102 is coupled to the sensor unit 101 that is a capsule strain gauge, and the metal-coated cable 102 is connected to the flexible cable 104 by the cable connecting unit 103. A bridge adapter 105 is coupled to the. The sensor unit (capsule type strain gauge) 101 is a tube made of a heat-resistant metal and in which a strain gauge is enclosed. A metal-coated cable 102 as a heat-resistant cable encloses a signal wire in a heat-resistant tubular metal coating such as a so-called MI (Mineral Insulator) cable (inorganic insulating cable) and an inorganic insulator (for example, in the metal coating). , Ceramic powder) to insulate the signal line from the metal coating. The flexible cable 104 is a cable in which a signal line is enclosed in a flexible sheath to give flexibility. The cable connecting portion 103 is a portion that hermetically connects the metal-coated cable 102 and the flexible cable 104, and may be configured as shown in, for example, Patent Document 1 (Japanese Patent No. 3230120). The bridge adapter 105 constitutes a Wheatstone bridge circuit for measurement together with the gauge resistance of the sensor unit 101 connected via the metal-coated cable 102, the cable connection unit 103, and the flexible cable 104. The bridge adapter 105 is connected to the power supply source and the detection signal processing unit via the flexible cord 106.

Specifically, the bridge adapter 105 is configured so as to show an equivalent circuit in FIG. 11 when, for example, a two-element type capsule strain gauge is used as the strain gauge constituting the sensor unit 101. That is, in this case, the strain gauge by the sensor unit 101 is configured as a half bridge composed of a series circuit of an active gauge resistor 1011 and a dummy gauge resistor 1012, and a signal line is formed from three points of both ends of the series circuit and their connection points. Has been pulled out. The active gauge resistance 1011 indicates a resistance value RA obtained by adding the cable resistance of the metal-coated cable 102 and the cable resistance of the flexible cable 104 to the active strain gauge resistance of the sensor unit 101, and the dummy gauge resistance 1012 is a dummy value of the sensor unit 101. A resistance value RD obtained by adding the cable resistance of the metal-coated cable 102 and the cable resistance of the flexible cable 104 to the strain gauge resistance is shown.
The bridge adapter 105 includes a Wheatstone bridge configuration resistor (resistance value R1) 1051, a Wheatstone bridge configuration resistance (resistance value R2) 1052, a gauge temperature compensation resistor (resistance value RTC (+ )) 1053, gauge temperature compensation resistor (resistance value RTC (-)) 1054, lead wire temperature compensation resistor (resistance value RLC (+)) 1055, lead wire temperature compensation resistor (resistance value RLC (-)) 1056, bridge balance A compensation resistor (resistance value RBAL (+)) 1057 and a bridge balance compensation resistor (resistance value RBAL (−)) 1058 are mounted, and a circuit as shown in FIG. 11 is configured.

  That is, the gauge side includes the gauge terminal TG1, the gauge terminal TG2, the gauge terminal TG3, and the shield terminal TS1, and the signal processing system side includes the power source (bridge power source, the same applies hereinafter) input terminal TI1, the power source input terminal. Each terminal includes TI2, signal output terminal TO1, signal output terminal TO2, and shield terminal TS2. One end of the series circuit of the active gauge resistor 1011 and the dummy gauge resistor 1012 of the sensor unit 101 is connected to the gauge terminal TG1, and the connection point of the active gauge resistor 1011 and the dummy gauge resistor 1012 of the series circuit is connected to the gauge terminal TG2. However, the other end of the series circuit is connected to the gauge terminal TG3, and the shield part of the flexible cable 104 connected to the shield part of the sensor part 101 via the shield part of the metal-coated cable 102 to the shield terminal TS1. Are connected to each other. The power source input terminal TI1 and the power source input terminal TI2 are supplied with bridge power source power supplied from the signal processing system to the strain gauge bridge, and the signal output terminal TO1 and the signal output terminal TO2 perform signal processing from the strain gauge bridge. The detection signal output output to the system is taken out. The shield terminal TS2 is connected to the shield portion of the signal processing system via the shield portion of the connection signal line with the signal processing system.

  The gauge terminal TG1 is connected to the signal output terminal TO1 through a gauge temperature compensation resistor (RTC (+)) 1053, a bridge balance compensation resistor (RBAL (+)) 1057, and a Wheatstone bridge configuration resistor (R1) 1051 sequentially in series. Is done. The gauge terminal TG3 is connected to the signal output terminal TO1 through a gauge temperature compensation resistor (RTC (−)) 1054, a bridge balance compensation resistor (RBAL (−)) 1058, and a Wheatstone bridge configuration resistor (R2) 1052 sequentially in series. Has been. A lead wire temperature compensation resistor (RLC (+)) 1055 is connected between a connection point between the gauge temperature compensation resistor (RTC (+)) 1053 and the bridge balance compensation resistor (RBAL (+)) 1057 and the gauge terminal TG2. Is connected. A lead wire temperature compensation resistor (RLC (−)) 1056 is connected between the gauge terminal TG2, and a connection point between the gauge temperature compensation resistor (RTC (−)) 1054 and the bridge balance compensation resistor (RBAL (−)) 1058. Is connected. The connection point of the gauge terminal TG2, that is, the lead wire temperature compensation resistor (RLC (+)) 1055 and the lead wire temperature compensation resistor (RLC (−)) 1056 is connected to the signal output terminal TO2. A connection point between the gauge temperature compensation resistor (RTC (+)) 1053 and the bridge balance compensation resistor (RBAL (+)) 1057 is connected to the power input terminal TI1. A connection point between the gauge temperature compensation resistor (RTC (−)) 1054 and the bridge balance compensation resistor (RBAL (−)) 1058 is connected to the power input terminal TI2.

  The Wheatstone bridge constituting resistor (R1) 1051 and the Wheatstone bridge constituting resistor (R2) 1052 together with the active gauge resistor 1011 and the dummy gauge resistor 1012 constitute a Wheatstone bridge. The gauge temperature compensation resistor (RTC (+)) 1053 and the gauge temperature compensation resistor (RTC (−)) 1054 are an active strain gauge resistance of the sensor unit 101 in the active gauge resistor 1011 and a dummy strain of the sensor unit 101 in the dummy gauge resistor 1012. The lead wire temperature compensation resistor (RLC (+)) 1055 and the lead wire temperature compensation resistor (RLC (−)) 1056 are compensated for variations in the resistance value due to the temperature characteristics of the gauge resistance. The variation of the resistance value due to the temperature characteristics of the resistance, the cable resistance of the metal-coated cable 102, and the cable resistance of the flexible cable 104 is compensated. A bridge balance compensation resistor (RBAL (+)) 1057 and a bridge balance compensation resistor (RBAL (−)) 1058 are an active strain gauge resistance of the sensor unit 101 in the active gauge resistor 1011 and a dummy strain of the sensor unit 101 in the dummy gauge resistor 1012. Gauge resistance, lead wire resistance of the lead wire of the sensor unit 101, cable resistance of the metal-coated cable 102 and cable resistance of the flexible cable 104, and gauge temperature compensation resistance (RTC) for compensating for variations in resistance values due to these temperature characteristics (+)) 1053, comprehensive bridge including gauge temperature compensation resistor (RTC (-)) 1054, lead wire temperature compensation resistor (RLC (+)) 1055 and lead wire temperature compensation resistor (RLC (-)) 1056 Balance fluctuation To amortization.

These gauge temperature compensation resistors (RTC (+)) 1053, gauge temperature compensation resistors (RTC (−)) 1054, lead wire temperature compensation resistors (RLC (+)) 1055, and lead wire temperature compensation resistors (RLC (−)) 1056 The specific temperature compensation such as is disclosed in, for example, Patent Document 2 (Japanese Patent No. 3275117), and detailed description thereof is omitted here.
12 and 13 show the mounting state of the front surface and the back surface of the bridge adapter substrate 1059 of the bridge adapter 105 with the shield container removed. As shown in the figure, the bridge adapter board 1059 has a rectangular shape, and a gauge temperature compensation resistor (RTC (+)) 1053 and a bridge balance compensation resistor (RBAL (+)) are formed on the surface side along the direction of the flexible cable 104. 1057 are arranged in tandem and substantially parallel to them, a gauge temperature compensation resistor (RTC (−)) 1054 and a bridge balance compensation resistor (RBAL (−)) 1058 are arranged in tandem and substantially orthogonal thereto. A lead wire temperature compensation resistor (RLC (+)) 1055 and a lead wire temperature compensation resistor (RLC (−)) 1056 are arranged in a column in the direction. In addition, on the back side of the bridge adapter board 1059, the gauge temperature compensation resistor (RTC (+)) 1053 and the bridge balance compensation resistor (RBAL (+)) 1057 are arranged in parallel with the gauge temperature compensation resistor ( A Wheatstone bridge configuration resistor (R1) 1051 and a Wheatstone bridge configuration resistor (R2) 1052 are arranged substantially parallel to the row of RTC (−)) 1054 and bridge balance compensation resistor (RBAL (−)) 1058.

Such a capsule strain gauge is suitable for use under high temperature conditions, and is often used for measurement in a sealed space such as a high temperature pressure vessel and a turbine engine. Such a sealed space generally has different pressures on both sides of a partition partitioning the space. As described above, when performing measurement in a sealed space using a capsule strain gauge, the sensor unit 101 is sequentially attached to the inner wall of the low-pressure side container as shown in FIG. Finally, it is necessary to draw out the cable to the outside of the partition wall 301 of the container while keeping hermeticity using the compression fitting 201 or the like. For example, in the case of an MI cable having a length of several tens of meters, it is a problem in terms of work efficiency to pass through the hollow opening of the compression fitting 201 from the sensor unit 101 side. Therefore, the compression is performed from the cable end side (right end side in FIG. 14). Generally, the fitting is passed through the fitting 201.
Conventionally, since the shape dimension of the bridge adapter 105 is larger than the hollow opening diameter of the compression fitting 201, the cable (flexible cable 104) once connected with the bridge adapter 105 is attached to the sensor unit 101 at the time of attachment work. Alternatively, it is necessary to reconnect the bridge adapter 105 after removing the cable from the metal-coated cable 102) and passing the cable through the hollow opening of the compression fitting 201. Such an operation not only reduces the efficiency of the measurement preparation work and increases the number of work steps in construction, but also causes a new miswiring when reconnecting.

Japanese Patent No. 3230120 Japanese Patent No. 3275117

The present invention has been made in view of the above-described circumstances, and has a simple configuration in a bridge adapter and a cable connection structure of a capsule strain gauge for use in a capsule strain gauge in which a strain gauge is enclosed in a metal tube. Therefore, it is an object of the present invention to provide a bridge adapter and a cable connection structure that can be easily installed in a sealed location, can reduce the number of construction steps for installation, and can effectively prevent erroneous wiring.
The purpose of claim 1 of the present invention is that it can be easily installed in a sealed location, can reduce the number of construction steps for installation, can effectively prevent erroneous wiring, and can also prevent the entire cable connection structure. The object is to provide a bridge adapter that can be simplified in configuration.
A second object of the present invention is to provide a bridge adapter capable of maintaining the enhanced airtightness of the connecting portion between the heat-resistant cable and the flexible cable.
The object of claim 3 of the present invention is particularly simple cable connection that is easy to install in a sealed location, can reduce construction man-hours for installation, and can effectively prevent erroneous wiring. To provide a structure.
The object of claim 4 of the present invention is to provide a cable connection structure capable of strengthening and maintaining the airtightness of the connection portion between the heat-resistant cable and the flexible cable.

In order to achieve the first object, a bridge adapter for a capsule-type high-temperature strain gauge according to the present invention described in claim 1 is provided.
In a bridge adapter for capsule-type high-temperature strain gauges, in which a strain gauge is enclosed in a metal tube,
The bridge adapter is
One end of the signal wire is hermetically connected to the strain gauge sensor section of the capsule-type high-temperature strain gauge with the signal wire insulated and inserted inside the heat-resistant tube, and the signal wire is enclosed in the flexible sheath And the other end is hermetically connected to a flexible cable having flexibility,
Bridge connection of the capsule-type high-temperature strain gauge via the heat-resistant cable, compensating for an apparent strain generated in the bridge and connecting to the flexible cable,
The bridge circuit portion including the connection portion to the signal line of the heat-resistant cable and the connection portion to the signal line of the flexible cable is accommodated, and the heat-resistant tubular body of the heat-resistant cable and the flexible sheath of the flexible cable are hermetically sealed A cover portion to be coupled, and the arrangement configuration of the components of the bridge circuit portion is narrowed, and the outer diameter of the cover portion is formed in a through hole formed in a partition wall that partitions a space having a pressure difference. It is characterized in that the diameter is reduced so that it can be inserted into the hollow opening of the sealing holding member for sealing and holding the cable.
The bridge adapter for a capsule type high temperature strain gauge according to the present invention described in claim 2 is the bridge adapter for a capsule type high temperature strain gauge according to claim 1,
The bridge adapter includes a filler filled in the inside of the covering portion.

In order to achieve the above-described object, the cable connection structure according to the present invention described in claim 3
In the cable connection structure of a capsule-type high-temperature strain gauge, in which a strain gauge is enclosed in a metal tube,
One end of the signal wire is hermetically connected to the strain gauge sensor section of the capsule-type high-temperature strain gauge. The signal wire is sealed in the flexible sheath. A cable connecting portion in which the other end is hermetically connected to a flexible cable having flexibility,
The heat-resistant cable has a connecting portion that accommodates the connecting portion to the signal line and the connecting portion to the signal line of the flexible cable, and is hermetically coupled to the heat-resistant tubular body of the heat-resistant cable and the flexible covering of the flexible cable. A cable connection;
One end is connected to the flexible cable and the other end is connected to another flexible cable, and the capsule-type high-temperature strain gauge is bridge-connected through the heat-resistant cable to compensate for the apparent strain generated in the bridge. A bridge circuit portion connected to the flexible cable; a bridge circuit portion including a connection portion to a signal line of the flexible cable and a connection portion to a signal line of the other flexible cable; A bridge adapter having a covering portion coupled to a flexible covering of the other flexible cable,
Sealing and holding for holding the heat-resistant cable sealed in a through hole formed in a partition wall that partitions the space where the outer diameter of the covering portion has a pressure difference, narrowing the arrangement configuration of the components of the bridge circuit portion A bridge adapter having a reduced diameter so that it can be inserted into the hollow opening of the member;
It is characterized by comprising.

The cable connection structure according to the present invention described in claim 4 is the cable connection structure of claim 3,
The cable connection part includes a filler filled in the covering part.

According to the present invention, in a bridge adapter for use in a capsule-type high-temperature strain gauge in which a strain gauge is enclosed in a metal tube, and in a cable connection structure for use in a capsule-type strain gauge, a simple configuration can be applied to a sealed location. It is possible to provide a bridge adapter and a cable connection structure for a capsule-type high-temperature strain gauge that can be easily installed, can reduce the number of construction steps for installation, and can effectively prevent erroneous wiring.
That is, according to the bridge adapter of claim 1 of the present invention, in the bridge adapter for a capsule type high-temperature strain gauge in which a strain gauge is sealed in a metal tube, the bridge adapter has a signal wire inside the heat resistant tubular body. A flexible cable that is insulated and inserted into a heat-resistant cable that is hermetically connected to the strain gauge sensor section of a capsule-type high-temperature strain gauge, and one end of which is hermetically connected and a signal wire is enclosed in a flexible sheath. The other end is airtightly connected, and the capsule-type high-temperature strain gauge is bridge-connected via the heat-resistant cable, compensates for apparent strain generated in the bridge, and is connected to the flexible cable, and The connection of the heat-resistant cable to the signal wire and the signal of the flexible cable The bridge circuit portion including a connection portion to a wire, the heat resistant tubular body of the heat resistant cable, and a covering portion that is airtightly coupled to a flexible covering of the flexible cable, and the bridge circuit portion In the hollow opening of the sealing holding member for narrowing the arrangement configuration of the components, and for the outer diameter of the covering portion to seal and hold the heat-resistant cable in the through hole formed in the partition wall that partitions the space having a pressure difference The diameter is reduced so that it can be inserted into
In particular, it can be easily installed in a sealed location, reducing the number of installation steps for installation, not only preventing miswiring effectively, but also simplifying the overall structure of the cable connection structure. It becomes.
According to the bridge adapter for a capsule-type high-temperature strain gauge according to claim 2 of the present invention, in the bridge adapter according to claim 1, the bridge adapter includes a filling material filled in the covering portion. In particular, it is possible to maintain and maintain the airtightness of the connection portion between the heat-resistant cable and the flexible cable.

  Furthermore, according to the cable connection structure of claim 3 of the present invention, in the cable connection structure of the capsule type high temperature strain gauge in which the strain gauge is enclosed in the metal tube, the signal line is insulated and inserted into the heat resistant tube body. One end is hermetically connected to a heat-resistant cable that is hermetically connected to the strain gauge sensor section of the capsule-type high-temperature strain gauge, and the other end is connected to a flexible flexible cable with a signal wire enclosed in a flexible sheath. Is a cable connection portion that is hermetically connected, and accommodates the connection portion to the signal line of the heat-resistant cable and the connection portion to the signal line of the flexible cable, and the heat-resistant tubular body of the heat-resistant cable and the flexible cable A cable connecting portion having a covering portion hermetically coupled to the flexible covering; and the flexible cable. And the other end is connected to another flexible cable, and the capsule-type high-temperature strain gauge is bridge-connected via the heat-resistant cable to compensate for the apparent strain generated in the bridge and connected to the flexible cable. A bridge circuit portion including the connection portion to the signal line of the flexible cable and the connection portion to the signal line of the other flexible cable, and a flexible covering of the flexible cable and the other flexible cable. A bridge adapter having a covering portion coupled to a flexible covering of a cable, wherein the arrangement of the components of the bridge circuit portion is narrowed, and the outer diameter of the covering portion is a partition wall that partitions a space having a pressure difference For sealing and holding the heat-resistant cable in the formed through hole It is equipped with a bridge adapter that is reduced in diameter so that it can be inserted into the hollow opening of the sealing holding member, and in particular, it is easy to install in a sealed location, reducing the number of construction steps for installation. The number of wiring lines can be reduced, erroneous wiring can be effectively prevented, and the configuration is simple.

  According to the cable connection structure of claim 4 of the present invention, in the cable connection structure of claim 3, the cable connection portion includes a filler filled in the inside of the covering portion, It becomes possible to maintain and maintain the airtightness of the connection portion between the cable and the flexible cable.

Hereinafter, based on the embodiment which materialized the present invention, the bridge adapter of the present invention is explained in detail with reference to drawings.
FIG. 1 shows a configuration of a main part of a cable connection structure of a capsule strain gauge using a bridge adapter according to a first embodiment of the present invention.
The cable connection structure shown in FIG. 1 includes a sensor unit 1, a metal-clad cable 2, a bridge adapter 3, and a flexible cable 4. As shown in FIG. 1, a metal-coated cable 2 is coupled to a sensor unit 1 that is a capsule-type strain gauge, and the metal-coated cable 2 is connected to a flexible cable 4 by a bridge adapter 3 having a cable connection unit function. . The sensor unit (capsule type strain gauge) 1 is a tube made of a heat-resistant metal and in which a strain gauge is enclosed. The metal-coated cable 2 as a heat-resistant cable encloses a signal line in a heat-resistant tubular metal coating like a so-called MI (Mineral Insulator) cable (inorganic insulating cable) and is an inorganic insulator in the metal coating. The signal line is insulated from the metal coating by filling ceramic powder. The flexible cable 4 is one in which a signal line is enclosed in a flexible sheath to give flexibility.

In this case, the bridge adapter 3 includes a function of a cable connection portion that hermetically connects the metal-coated cable 2 and the flexible cable 4. For example, a cable connection portion as shown in Patent Document 1 (Japanese Patent No. 3230120). Also works. The bridge adapter 3 further constitutes a Wheatstone bridge circuit for measurement together with the gauge resistance of the sensor unit 1 connected via the metal-coated cable 2. The bridge adapter 3 is connected to the power supply source and the detection signal processing unit via the flexible cable 4.
In FIG. 1, a part of the shield container as a covering portion of the bridge adapter 3 is cut away, and in FIG. 2, the mounting state of the bridge adapter board of the bridge adapter 3 is shown by removing the shield container. Show. The bridge adapter 3 includes a shield container 30, a Wheatstone bridge configuration resistor (R1) 31, a Wheatstone bridge configuration resistor (R2) 32, a gauge temperature compensation resistor (RTC) 33, a gauge temperature compensation resistor (RTC) 34, and a lead wire temperature. It has a compensation resistor (RLC) 35, a lead wire temperature compensation resistor (RLC) 36, a bridge balance compensation resistor (RBAL) 37, a bridge balance compensation resistor (RBAL) 38, and a bridge adapter board 39. In this case, a Wheatstone bridge configuration resistor (R1) 31, a Wheatstone bridge configuration resistor (R2) 32, a gauge temperature compensation resistor (RTC) 33, a gauge temperature compensation resistor (RTC) 34, and a lead wire temperature compensation resistor (RLC) 35 The lead wire temperature compensation resistor (RLC) 36, the bridge balance compensation resistor (RBAL) 37, the bridge balance compensation resistor (RBAL) 38, and the like are configured using so-called chip parts.

  As shown in the figure, the bridge adapter board 39 has an elongated rectangular shape along the direction of the metal-clad cable 2 and the flexible cable 4, and the surface of the bridge adapter board 39 extends along the longitudinal direction of the bridge-adapter board 39 (ie, the metal-clad cable 2 and along the direction of the flexible cable 4) a gauge temperature compensation resistor (RTC) 33, a bridge balance compensation resistor (RBAL) 37 and a Wheatstone bridge configuration resistor (R1) 31 are arranged in tandem and substantially parallel to them. In addition, a gauge temperature compensation resistor (RTC) 34, a bridge balance compensation resistor (RBAL) 38, and a Wheatstone bridge configuration resistor (R2) 32 are arranged in series, and the gauge temperature compensation resistors (RTC) 33 and 34 are bridged. Balance compensation resistors (RBAL) 37 and 38 A lead wire temperature compensation resistor (RLC) 35 and a lead wire temperature compensation resistor (RLC) 36 are arranged in parallel and parallel to each other in the longitudinal direction of the bridge adapter board 39 (that is, gauge temperature compensation resistor (RTC) 33, bridge balance compensation). Resistor (RBAL) 37 and Wheatstone bridge configuration resistor (R1) 31 in the tandem direction and substantially parallel thereto, gauge temperature compensation resistor (RTC) 34, bridge balance compensation resistor (RBAL) 38 and Wheatstone bridge configuration resistor (R2) is arranged to be inclined with respect to (32 column direction).

  Conventionally, as shown in FIG. 12, a gauge temperature compensation resistor (RTC (+)) 1053 and a bridge balance compensation resistor (RBAL (+)) 1057 are connected in series and parallel to the gauge temperature compensation resistor (RTC (-)). ) 1054 and the lead wire temperature compensation resistor (RLC (−)) 1056 and the lead wire temperature compensation resistor (RLC (−)) 1056 are arranged in the direction substantially orthogonal to the column of the bridge balance compensation resistor (RBAL (−)) 1058. As shown in FIG. 2, a pair of lead wire temperature compensation resistors (RLC) 35 and a lead wire temperature compensation resistor (RLC) 36 having different polarities are arranged in parallel and parallel, as shown in FIG. Vertical of gauge temperature compensation resistor (RTC) 33, bridge balance compensation resistor (RBAL) 37, and Wheatstone bridge configuration resistor (R1) 31 Bridge adapter board because the direction and gauge temperature compensation resistor (RTC) 34, the bridge balance compensation resistor (RBAL) 38, and the Wheatstone bridge configuration resistor (R2) 32 are inclined with respect to the column direction. The mounting dimension in the width direction 39 can be significantly reduced. By adopting such a mounting arrangement, the bridge adapter 3 can form the bridge adapter substrate 39 in a narrow shape, and the shield container 30 serving as a covering portion for accommodating them can be formed in a sufficiently small diameter.

  Thus, a Wheatstone bridge configuration resistor (R1) 31, a Wheatstone bridge configuration resistor (R2) 32, a gauge temperature compensation resistor (RTC) 33, a gauge temperature compensation resistor (RTC) 34, and a lead wire temperature compensation resistor (RLC) 35, a lead wire temperature compensation resistor (RLC) 36, a bridge balance compensation resistor (RBAL) 37, and a bridge balance compensation resistor (RBAL) 38 are mounted on the bridge adapter substrate 39 and accommodated in the shield container 30. Near the both ends of the bridge adapter board 39, the signal line of the metal-coated cable 2 and the signal line of the flexible cable 4 are connected. The Wheatstone bridge configuration resistor (R1) 31, the Wheatstone bridge configuration resistor (R2) 32, Gauge temperature compensation resistor (RTC) 33, Gauge temperature compensation resistor (RTC) 34, lead wire temperature compensation resistor (RLC) 35, lead wire temperature compensation resistor (RLC) 36, bridge balance compensation resistor (RBAL) 37, and bridge balance compensation A bridge adapter board 39 on which a resistor (RBAL) 38 is mounted is hermetically sealed in the shield container 30 together with the connection portions of the metal-clad cable 2 and the flexible cable 4 to the bridge adapter board 39. At this time, the shield container 30 is preferably filled with a filler such as an epoxy resin. By comprising in this way, the further airtight improvement can be aimed at.

  Specifically, the bridge adapter 3 is substantially the same as the equivalent circuit of FIG. 11 as shown in FIG. 3 when, for example, a two-element capsule strain gauge is used as the strain gauge constituting the sensor unit 1. Are similarly configured. That is, in this case, the strain gauge by the sensor unit 1 is configured as a half bridge composed of a series circuit of an active gauge resistor 1A and a dummy gauge resistor 1B, and a signal line is formed from three points of both ends of the series circuit and their connection points. Has been pulled out. The active gauge resistance 1A indicates a resistance value RA obtained by adding the cable resistance of the metal-clad cable 2 to the active strain gauge resistance of the sensor unit 1, and the dummy gauge resistance 1B indicates that the dummy strain gauge resistance of the sensor unit 1 is metal-coated. The resistance value RD which added the cable resistance of the cable 102 is shown. The bridge adapter 3 includes a Wheatstone bridge configuration resistor (R1) 31, a Wheatstone bridge configuration resistor (R2) 32, a gauge temperature compensation resistor (RTC (+)) 33, a gauge on a bridge adapter substrate 39 made of a printed wiring board. Temperature compensation resistor (RTC (-)) 34, lead wire temperature compensation resistor (RLC (+)) 35, lead wire temperature compensation resistor (RLC (-)) 36, bridge balance compensation resistor (RBAL (+)) 37 and bridge A balance compensation resistor (RBAL (−)) 38 is mounted to configure a circuit as shown in FIG.

  In other words, the gauge side includes the gauge terminal TG1, the gauge terminal TG2, the gauge terminal TG3 and the shield terminal TS1, and the signal processing system side includes the power input terminal TI1, the power input terminal TI2, the signal output terminal TO1, Each terminal includes a signal output terminal TO2 and a shield terminal TS2. One end of the series circuit of the active gauge resistor 1A and the dummy gauge resistor 1B of the sensor unit 1 is connected to the gauge terminal TG1, and the connection point of the active gauge resistor 1A and the dummy gauge resistor 1B of the series circuit is connected to the gauge terminal TG2. However, the other end of the series circuit is connected to the gauge terminal TG3, and the shield part of the metal-coated cable 2 is connected to the shield part of the sensor part 1 and the shield terminal TS1, respectively. The power input terminal TI1 and the power input terminal TI2 are supplied with power supplied from the signal processing system to the strain gauge bridge, and the signal output terminal TO1 and the signal output terminal TO2 are connected to the signal processing system from the strain gauge bridge. The detection signal output to be output to is taken out. The shield terminal TS2 is connected to the shield portion of the signal processing system via the shield portion of the connection signal line with the signal processing system.

  The gauge terminal TG1 is connected to the signal output terminal TO1 through a gauge temperature compensation resistor (RTC (+)) 33, a bridge balance compensation resistor (RBAL (+)) 37, and a Wheatstone bridge configuration resistor (R1) 31 sequentially in series. The gauge terminal TG3 is connected to the signal output terminal TO1 through a gauge temperature compensation resistor (RTC (−)) 34, a bridge balance compensation resistor (RBAL (−)) 38, and a Wheatstone bridge configuration resistor (R2) 32 in series. It is connected to the. Between the connection point of the gauge temperature compensation resistor (RTC (+)) 33 and the bridge balance compensation resistor (RBAL (+)) 37 and the gauge terminal TG2, a lead wire temperature compensation resistor (RLC (+)) 35 is provided. Is connected. A lead wire temperature compensation resistor (RLC (-)) 36 is connected between the gauge terminal TG2, and a connection point between the gauge temperature compensation resistor (RTC (-)) 34 and the bridge balance compensation resistor (RBAL (-)) 38. Is connected. The gauge terminal TG2, that is, the connection point between the lead wire temperature compensation resistor (RLC (+)) 35 and the lead wire temperature compensation resistor (RLC (−)) 36 is connected to the signal output terminal TO1. The connection point between the gauge temperature compensation resistor (RTC (+)) 33 and the bridge balance compensation resistor (RBAL (+)) 37 is connected to the power input terminal TI1, and the gauge temperature compensation resistor (RTC (−)) 34 and the bridge are connected. A connection point with the balance compensation resistor (RBAL (−)) 38 is connected to the power input terminal TI2. Although not shown in detail, the bridge adapter 3 having such a configuration is enclosed in a shield container 30 and the shield container 30 is connected to both the shield terminal TS1 and the shield terminal TS2.

  The Wheatstone bridge configuration resistor (R1) 31 and the Wheatstone bridge configuration resistor (R2) 32 constitute a Wheatstone bridge together with the active gauge resistor 1A and the dummy gauge resistor 1B. The gauge temperature compensation resistor (RTC (+)) 33 and the gauge temperature compensation resistor (RTC (−)) 34 are an active strain gauge resistance of the sensor unit 1 in the active gauge resistor 1A and a dummy strain of the sensor unit 1 in the dummy gauge resistor 1B. The lead wire temperature compensation resistor (RLC (+)) 35 and the lead wire temperature compensation resistor (RLC (−)) 36 compensate for fluctuations in the resistance value due to the temperature characteristics of the gauge resistance. The resistance variation due to the temperature characteristics of the resistance and the cable resistance of the metal-coated cable 2 is compensated. The bridge balance compensation resistor (RBAL (+)) 37 and the bridge balance compensation resistor (RBAL (−)) 38 are an active strain gauge resistance of the sensor unit 1 in the active gauge resistor 1A and a dummy strain of the sensor unit 1 in the dummy gauge resistor 1B. Gauge resistance, lead wire resistance of the lead wire of the sensor unit 1 and cable resistance of the metal-coated cable 2, and a gauge temperature compensation resistor (RTC (+)) 33 for compensating for variations in resistance value due to these temperature characteristics, gauge Compensates for fluctuations in the overall bridge balance due to the temperature characteristics of the temperature compensation resistor (RTC (-)) 34, the lead wire temperature compensation resistor (RLC (+)) 35, and the lead wire temperature compensation resistor (RLC (-)) 36. .

As described above, the gauge temperature compensation resistor (RTC (+)) 33, the gauge temperature compensation resistor (RTC (−)) 34, the lead wire temperature compensation resistor (RLC (+)) 35, and the lead wire temperature compensation resistor ( Specific temperature compensation such as RLC (−) 36 is disclosed in, for example, Patent Document 2 (Japanese Patent No. 3275117), and detailed description thereof is omitted here.
When performing measurement in a sealed low pressure space using such a capsule strain gauge, as shown schematically in FIG. 4, the sensor unit 1 is sequentially attached to the inner wall of the low pressure side container. Finally, pull out the cable to the outside of the partition wall 301 of the container while keeping airtightness using a compression fitting 201 or the like as a sealing holding member for sealing and holding a heat-resistant cable, for example, the metal-coated cable 2. Is required. For example, in the case of an MI cable having a length of several tens of meters, since it is a problem in terms of work efficiency to pass through the hollow opening of the compression fitting 201 from the sensor unit 1 side, from the cable end side (right end side in FIG. 4) It is common to pass through the compression fitting 201. As shown in an exploded view in FIG. 5, the normal compression fitting 201 includes a body 2011, a sheet 2012, a sealant 2013, a follower 2014, and a cap 2015. The body 2011 has a substantially cylindrical shape as a whole, and is formed with a tapered shape so that the outer peripheral portion at one end is press-fitted into the opening of the partition wall 301, and the outer peripheral portion at the other end is used as a screw portion for screwing the cap 2015. The large diameter part which forms and swells to an outer periphery is formed in the intermediate part.

The sheet 2012, the sealant 2013, and the follower 2014 are all divided into a plurality of parts. With the flexible cable 4 pulled out from the inside of the partition wall 301 through the through hole, the bridge adapter 3 and the end of the metal-coated cable 2 inserted into the hollow portion of the body 2011 of the compression fitting 201 and the hollow opening of the cap 2015, The male thread portion of the body 2011 is screwed into the female thread of the through hole of the partition wall 301, the metal-coated cable 2 is sequentially sandwiched between the sheet 2012, the sealant 2013 and the follower 2014, inserted into the opening of the body 2011, and tightened with the cap 2015. Thus, the metal-coated cable 2 is hermetically held on the partition wall 301 by the compression fitting 201. The body 2011 may be press-fitted into the through hole of the partition wall 301 in advance.
When the measurement space is on the low-pressure side, the body 2011 of the compression fitting 201 is press-fitted from the outside as shown in FIGS. 4 and 5, and the compression fitting 201 is attached to the outside of the partition wall 301. However, when the space to be measured is on the high pressure side, the body 2011 of the compression fitting 201 is press-fitted from the inside as shown in FIG. 6, and the body 2011 of the compression fitting 201 is attached to the inside of the partition wall 301.

  Conventionally, since the shape dimension of the bridge adapter 105 is larger than the hollow opening diameter of the compression fitting 201, the cable (flexible cable 104) once connected with the bridge adapter 105 is attached to the sensor unit 101 at the time of attachment work. Alternatively, after removing from the metal-clad cable 102) and passing the cable through the hollow opening of the compression fitting 201, it is necessary to reconnect to the bridge adapter 105 again. Since the outer diameter is smaller than the inner diameter of the hollow portion of the body 2011 of the compression fitting fitting 201 and the inner diameter of the hollow opening of the cap 2015, the flexible cable 104 or the metal coating can be used without removing the bridge adapter 3. Stay connected to Buru 102, it is possible to perform the installation construction of the capsule strain gauge.

As described above, the Wheatstone bridge circuit is configured, and the bridge adapter 3 that compensates for the apparent strain due to temperature is formed into a thin shape, and is integrally formed with the connection portion of the metal-coated cable 2 and the flexible cable 4. For this reason, when measuring a sealed part such as a high-temperature pressure vessel and a turbine engine, the attachment work can be performed without removing the bridge adapter 3, and for example, a large number of capsule strain gauges are used. At that time, particularly, the work efficiency can be significantly reduced by improving work efficiency, and the rewiring work becomes unnecessary, so that the risk of erroneous wiring can be effectively avoided.
Further, by filling the bridge adapter 3 including the connecting portion function with an insulating filler such as epoxy resin, not only the drip-proof / insulation effect for the internal circuit of the bridge adapter 3 is obtained, but also the internal temperature is increased. Measurement stability is also improved by being uniform.

As described above, when measuring sealed locations such as high-temperature pressure vessels and turbine engines, it is possible to perform installation without removing the bridge adapter, especially when using a large number of capsule strain gauges. In addition, it is possible to greatly reduce the number of man-hours for construction and to prevent erroneous wiring by improving work efficiency. Furthermore, by filling the inside of the bridge adapter that becomes the connection part with a filler such as epoxy resin, the drip-proof effect on the internal bridge adapter circuit part is improved, and the internal temperature becomes uniform. There is also the advantage of stabilizing.
Note that it is possible to pass the small hollow opening of the compression fitting fitting even if the bridge adapter, which is small and narrow as described above, is provided in the middle of the flexible cable separately from the connection part between the metal-clad cable and the flexible cable. is there. The structure of the principal part of the cable connection structure of the capsule type high-temperature strain gauge using the bridge adapter according to the second embodiment of the present invention is shown in FIG.

  As shown in FIG. 7, a metal-coated cable 12 is coupled to the sensor unit 11 that is a capsule-type strain gauge, and the metal-coated cable 12 is connected to the flexible cable 14 by a cable connecting unit 13. The flexible cable 14 is coupled with a bridge adapter 15 that is small and narrow in the same manner as the configuration of the bridge adapter portion in the bridge adapter 3 described above. The bridge adapter 15 is connected to the power supply source and the detection signal processing unit via the flexible cable 16. In this case, the strain gauge by the sensor unit 11 is configured as a half bridge composed of a series circuit of an active gauge resistor and a dummy gauge resistor, and a signal line is drawn from three points of both ends of the series circuit and their connection points. The active gauge resistance indicates a resistance value RA obtained by adding the cable resistance of the metal-coated cable 12 and the cable resistance of the flexible cable 14 to the active strain gauge resistance of the sensor unit 11, and the dummy gauge resistance is a dummy strain gauge of the sensor unit 11. A resistance value RD obtained by adding the cable resistance of the metal-coated cable 12 and the cable resistance of the flexible cable 14 to the resistance is shown.

Furthermore, the present invention can be applied not only to the above-described bridge adapter for a two-element strain gauge used mainly for static measurement but also to a bridge adapter for a one-element strain gauge mainly used for dynamic measurement. . As a third embodiment of the present invention, a bridge adapter circuit when using a one-element strain gauge is shown in FIG. 8 for a case where a one-element two-wire strain gauge is used, and a one-element three-wire strain gauge is used. The case is shown in FIG.
When the bridge adapter according to the third embodiment of the present invention is used for a one-element two-wire strain gauge, as shown in FIG. 8, the strain gauge by the sensor unit 21 is composed of an active gauge resistor 211 (RA). The signal line is drawn from both ends of the active gauge resistor 211. The active gauge resistance 211 indicates a resistance value RA obtained by adding the cable resistance of the metal-coated cable (and the cable resistance of the flexible cable (when the connection portion is a separate body)) to the active strain gauge resistance of the sensor unit 21.

The bridge adapter 22 has a Wheatstone bridge configuration resistor (R1) 221, a Wheatstone bridge configuration resistor (R2) 222, a Wheatstone bridge configuration resistor (R3) 223, and a high-pass filter configuration on a bridge adapter substrate made of a printed wiring board. A resistor (R4) 224 and a high-pass filter configuration capacitor (C) 225 are mounted to configure a circuit as shown in FIG.
In other words, the gauge side includes the gauge terminal TG1, the gauge terminal TG2, the gauge terminal TG3 and the shield terminal TS1, and the signal processing system side includes the power input terminal TI1, the power input terminal TI2, the signal output terminal TO1, Each terminal includes a signal output terminal TO2 and a shield terminal TS2. One end of the active gauge resistor 211 of the sensor unit 21 is connected to the gauge terminal TG1, the other end of the active gauge resistor 211 is connected to the gauge terminal TG2, and the shield portion of the sensor unit 21 is connected to the shield terminal TS1. The shield portion of the coated cable (or the shield portion of the flexible cable connected via the shield portion) is connected. The power input terminal TI1 and the power input terminal TI2 are supplied with power supplied from the signal processing system to the strain gauge bridge, and the signal output terminal TO1 and the signal output terminal TO2 are connected to the signal processing system from the strain gauge bridge. The detection signal output to be output to is taken out.
The shield terminal TS2 is connected to the shield portion of the signal processing system via the shield portion of the connection signal line with the signal processing system.

  The gauge terminal TG1 is connected to the signal output terminal TO2 via a Wheatstone bridge configuration resistor (R3) 223, and the gauge terminal TG3 includes a Wheatstone bridge configuration resistor (R1) 221 and a Wheatstone bridge configuration resistor (R2) 222. The gauge terminal TG2 is connected to the signal output terminal TO1 via the high pass filter capacitor (C) 225, and is connected between the gauge terminal TG2 and the gauge terminal TG3. Are short-circuited, and a high-pass filter constituting resistor (R4) 224 is connected between the signal output terminal TO1 and the signal output terminal TO2. The gauge terminal TG1 is connected to the power input terminal TI1, and the connection point between the Wheatstone bridge configuration resistor (R1) 221 and the Wheatstone bridge configuration resistor (R2) 222 is connected to the power input terminal TI2. The bridge adapter 22 having such a configuration is also enclosed in a shield container (not shown), and this shield container is connected to both the shield terminal TS1 and the shield terminal TS2.

When the bridge adapter according to the third embodiment of the present invention is used for a one-element three-wire strain gauge, as shown in FIG. 9, the strain gauge formed by the sensor unit 23 is composed of an active gauge resistor 231 (RA). The first signal line is drawn from one end of the active gauge resistor 231, and the second and third signal lines are drawn from the other end of the active gauge resistor 231. The active gauge resistance 231 indicates a resistance value RA obtained by adding the cable resistance of the metal-coated cable (and the cable resistance of the flexible cable (when the connection portion is a separate body)) to the active strain gauge resistance of the sensor unit 23.
The bridge adapter 22 is configured in the same manner as in FIG. 8, and a Wheatstone bridge configuration resistor (R1) 221, a Wheatstone bridge configuration resistor (R2) 222, a Wheatstone bridge configuration resistor ( R3) 223, a high-pass filter configuration resistor (R4) 224, and a high-pass filter configuration capacitor (C) 225 are mounted. A first signal line connected to one end of the active gauge resistor 231 of the sensor unit 23 is connected to the gauge terminal TG1, and the gauge terminal TG2 and the gauge terminal TG3 are commonly connected to the other end of the active gauge resistor 231. The connected second and third signal lines are connected to each other, and the shield terminal TS1 is connected to the shield part of the sensor part 21 and the shield part of the metal-coated cable (or the shield of the flexible cable connected thereto) Part) is connected.
In addition, it goes without saying that the present invention can be variously modified without departing from the scope of the invention.

It is a figure showing a cable connection structure using a bridge adapter for capsule type high temperature strain gauges concerning a 1st embodiment of the present invention, partly notching. It is a figure which shows typically the mounting structure of the principal part of the bridge adapter for capsule type high temperature strain gauges of FIG. It is a circuit block diagram which shows typically the equivalent circuit at the time of using the bridge adapter for capsule type high temperature strain gauges of FIG. 1 for a 2 element 3 wire type strain gauge. It is a schematic diagram for demonstrating one form of the concrete construction of the cable connection structure using the bridge adapter for capsule type high temperature strain gauges of FIG. It is a schematic diagram which decomposes | disassembles and shows in order to demonstrate the process of the construction of FIG. It is a schematic diagram for demonstrating another form of the concrete construction of the cable connection structure using the bridge adapter for capsule type high temperature strain gauges of FIG. It is a figure which shows typically the cable connection structure using the bridge adapter for capsule type high temperature strain gauges concerning the 2nd Embodiment of this invention. It is a circuit block diagram which shows typically the equivalent circuit at the time of using the bridge adapter for capsule type high temperature strain gauges concerning the 3rd Embodiment of this invention for 1 element 2 wire | line type strain gauges. It is a circuit block diagram which shows typically the equivalent circuit at the time of using the bridge adapter for capsule type high temperature strain gauges of FIG. 8 for 1 element 3 wire type strain gauges. It is a figure which shows a conventional cable connection structure using a bridge adapter for a capsule type high temperature strain gauge with a part cut away. It is a circuit block diagram which shows typically the equivalent circuit at the time of using the bridge adapter for capsule type high temperature strain gauges of FIG. 10 for a 2 element 3 wire type strain gauge. It is a figure which shows typically the mounting structure by the side of the surface of the bridge adapter board | substrate of the bridge adapter for capsule type high temperature strain gauges of FIG. It is a figure which shows typically the mounting structure by the side of the back surface of the bridge adapter board | substrate of the bridge adapter for capsule type high temperature strain gauges of FIG. It is a schematic diagram for demonstrating one form of the concrete construction of the cable connection structure using the bridge adapter for capsule type high temperature strain gauges of FIG.

Explanation of symbols

1,11,21,23 Sensor part 1A Active gauge resistance 1B Dummy gauge resistance 2,12 Metal-coated cable (heat-resistant cable)
3, 15, 22 Bridge adapter 4, 14, 16 Flexible cable 13 Cable connection 30 Shield container 31 Wheatstone bridge configuration resistor (R1)
32 Resistance for Wheatstone bridge construction (R2)
33 gauge temperature compensation resistor (RTC (+))
34 gauge temperature compensation resistor (RTC (-))
35 Lead wire temperature compensation resistor (RLC (+))
36 Lead temperature compensation resistor (RLC (-))
37 Bridge balance compensation resistor (RBAL (+))
38 Bridge balance compensation resistor (RBAL (-))
39 Bridge Adapter Board 201 Compression Fitting Hardware 211 Active Gauge Resistance (RA)
221 Wheatstone bridge resistor (R1)
222 Wheatstone bridge configuration resistor (R2)
223 Wheatstone bridge configuration resistor (R3)
224 Resistor for high-pass filter configuration (R4)
225 High pass filter capacitor (C)
231 Active gauge resistance 301 Bulkhead 2011 Body 2012 Sheet 2013 Sealant 2014 Follower 2015 Cap TG1 Gauge terminal TG2 Gauge terminal TG3 Gauge terminal TS1 Shield terminal TS2 Shield terminal TI1 Power input terminal TI2 Power input terminal TO1 Signal output terminal TO2 Signal output terminal TO2

Claims (4)

In a bridge adapter for capsule-type high-temperature strain gauges, in which a strain gauge is enclosed in a metal tube,
The bridge adapter is
One end of the signal wire is hermetically connected to the strain gauge sensor section of the capsule-type high-temperature strain gauge. The signal wire is sealed in the flexible sheath. And the other end is hermetically connected to a flexible cable having flexibility,
Bridge connection of the capsule-type high-temperature strain gauge via the heat-resistant cable, compensating for an apparent strain generated in the bridge and connecting to the flexible cable,
The bridge circuit portion including the connection portion to the signal line of the heat-resistant cable and the connection portion to the signal line of the flexible cable is accommodated, and the heat-resistant tubular body of the heat-resistant cable and the flexible sheath of the flexible cable are hermetically sealed A cover portion to be coupled, and the arrangement configuration of the components of the bridge circuit portion is narrowed, and the outer diameter of the cover portion is formed in a through hole formed in a partition wall that partitions a space having a pressure difference. A bridge adapter for a capsule-type high-temperature strain gauge, characterized in that the diameter is reduced so that it can be inserted into a hollow opening of a sealing holding member for sealing and holding a cable.   The bridge adapter for a capsule-type high-temperature strain gauge according to claim 1, wherein a filler is filled and solidified inside the covering portion. In the cable connection structure of a capsule-type high-temperature strain gauge, in which a strain gauge is enclosed in a metal tube,
One end of the signal wire is hermetically connected to the strain gauge sensor section of the capsule-type high-temperature strain gauge. The signal wire is sealed in the flexible sheath. A cable connecting portion in which the other end is hermetically connected to a flexible cable having flexibility,
The heat-resistant cable has a connecting portion that accommodates the connecting portion to the signal line and the connecting portion to the signal line of the flexible cable, and is hermetically coupled to the heat-resistant tubular body of the heat-resistant cable and the flexible covering of the flexible cable. A cable connection;
One end is connected to the flexible cable and the other end is connected to another flexible cable, and the capsule-type high-temperature strain gauge is bridge-connected through the heat-resistant cable to compensate for the apparent strain generated in the bridge. A bridge circuit portion connected to the flexible cable; and the bridge circuit portion including a connection portion to a signal line of the flexible cable and a connection portion to a signal line of the other flexible cable; A bridge adapter coupled to a flexible sheath of the other flexible cable,
Sealing and holding for holding the heat-resistant cable sealed in a through hole formed in a partition wall that partitions the space where the outer diameter of the covering portion has a pressure difference, narrowing the arrangement configuration of the components of the bridge circuit portion A bridge adapter for a capsule-type high-temperature strain gauge that has a reduced diameter so that it can be inserted into the hollow opening of the member;
A cable connection structure comprising:   The cable connection structure for a capsule-type high-temperature strain gauge according to claim 3, wherein the cable connection portion includes a filler filled in the covering portion.