JPH0735626A - Connection structure of lead wire, temperature measuring device using connection structure thereof and manufacture of temperature measuring device - Google Patents

Abstract

PURPOSE:To prevent a short circuit phenomenon and the exposure of a lead wire from a resin surface with simple work, by integrally making resin forming with a first resin connecting member so that a second resin connecting member is interposed between the lead wire connecting parts of the one lead and the other lead. CONSTITUTION:Resin forming is made integrally with a first resin connecting member 3, including an end of a sheath tube 5 and an end of a covering wire 11, so as to have a through gap 13 between respective lead connecting parts 12, 12 formed by welding a temperature measuring lead 6 of a temperature measuring means 1 and a lead 10 of an extension cable 2. The resin forming is further made integrally with a second resin connecting member 4, so as to be filled up also in the gap 13, on the first resin connecting member 3. An about uniform resin layer is formed in the outer circumference part of the first resin connecting member 3 by the second resin connecting member 4, the appearance is put in order, the seal is kept, and also the work efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to connecting an extension cable to a temperature measuring means such as a thermocouple covered with a sheath tube,
Manufacture of a connecting structure of a conductor wire that can be connected so as not to cause a short circuit phenomenon by integrally molding an extension cable and an extension cable, and a temperature measuring device and a temperature measuring device using the connecting structure Regarding the method.

[0002]

2. Description of the Related Art Conventionally, for example, a thermocouple temperature-measuring conductor covered with a sheath pipe such as a stainless steel pipe and an extension conductor of an extension cable are pulled out and connected to each other, and a sheath pipe end portion and an extension cable shield wire end portion are connected. There is one that is integrally connected and connected with synthetic resin including.

[0003]

However, according to the conventional method, in order to prevent a short circuit, each conductor wire is bent and molded so as to hold the space between the conductor wires or at the connecting portion between the conductor wires. After winding the tape or applying the coating treatment, it is integrally molded with synthetic resin and connected, but there is a problem that such work is very troublesome, and even if such treatment is performed, synthetic resin Since there is a risk that the conductors and the connecting parts of the conductors will move and come into contact when integrally molded with, it is impossible to prevent the short circuit phenomenon completely, and the conductors are exposed from the resin surface. was there.

Therefore, according to the present invention, mass production can be performed by a simple operation, a short circuit phenomenon can be completely prevented, and a conductor connecting structure in which the conductor is not exposed from the resin surface and the connecting structure thereof. It is an object of the present invention to provide a temperature measuring device using the same and a method for manufacturing the temperature measuring device.

[0005]

In order to achieve the above object, a resin is integrally formed by a first resin connecting member so that a second resin connecting member is interposed between the conductor connecting portions of one conducting wire and the other conducting wire. It is characterized by being molded.

Also, in order to achieve the above-mentioned object, a structure in which the conductor connecting structure is applied to a temperature measuring device has an external structure between a conductor connecting portion between a temperature measuring conductor of a temperature measuring means and a conductor of an extension cable. The first resin connecting member is integrally resin-molded so as to have a void portion communicating with the first resin connecting member, and the second resin connecting member is integrally resin-molded so that the void portion is also filled on the first resin connecting member. By doing so, the temperature measuring means and the extension cable are connected.

Further, as a method of manufacturing this temperature measuring device, a temperature is measured by using a primary molding die having a primary cavity in which a partition wall is provided to separate a conductor connecting portion of one conductor from another conductor. By molding in a state in which the partition is located so that the partition wall is located between the conductor connecting portions connecting the temperature measuring conductor of the means and the conductor of the extension cable, there is a void portion communicating with the outside. A step of integrally resin-molding the temperature-measuring wire of the temperature-measuring means and a wire of the extension cable with the first resin connecting member; outside the first resin-connecting member integrally resin-molded by the primary molding die A step of resin-molding with the second resin connecting member by using a secondary molding die having a secondary cavity capable of being covered with resin and molding with the first resin connecting member positioned in the cavity; It is a method consisting of.

[0008]

As described above, according to the conductor connecting structure, the temperature measuring device using the connecting structure, and the method for manufacturing the temperature measuring device of the present invention, for example, when the temperature measuring means and the extension cable are connected as the conductor connecting structure. Using a primary molding die having a primary cavity in which a partition wall for separating the conductor connecting portion of one conductor from the conductor connecting the other conductor is used, the temperature measuring conductor of the temperature measuring means and the conductor of the extension cable are connected. By molding in such a state that the partition wall is located between the conductive wire connecting portions, the first resin connecting member having a void communicating with the outside is formed by molding in the primary cavity. And a conductor of an extension cable are integrally resin-molded, and then a secondary cavity that can be resin-molded by covering the first resin-connecting member integrally resin-molded by the primary molding die is formed. Using the mold for the next molding, The resin connecting member in the second resin connecting member in a state of being positioned in the cavity is to resin molding.

[0009]

The details of the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 shows a connection structure A (hereinafter simply referred to as a connection structure A) between the temperature measuring means and the extension cable in the first embodiment. Specifically, the resin mold shown in FIGS. 3 to 5 is used. It can be manufactured by using it.

In the connection structure A, as shown in FIG. 1, the end of the temperature measuring means 1 and the end of the extension cable 2 are connected to the first resin connecting member 3.
And the second resin connecting member 4 is integrally connected by resin molding. A soft resin or a hard resin can be used for each of the first resin connecting member 3 and the second resin connecting member 4, and the first resin connecting member 3 and the second resin connecting member 4 can be used.
It is possible to use the same resin or different resins.

As shown in FIG. 2, the temperature measuring means 1 uses a thermocouple, and two temperature measuring conducting wires 6 and insulation using powder of MgO, Al ₂ O ₃ or the like in a sheath tube 5 made of stainless steel. The material 7 is inserted, the temperature-measuring wire 6 is pulled out, and the end is filled with the resin sealing member 8.

As shown in FIG. 2, the extension cable 2 includes two conductors 10 covered with a resin insulating material 9, a glass braid, a metal braid, and a sheath wire portion 11 using a soft synthetic resin. The conductor 10 which is covered and exposed by the above is drawn out to the outside.

As shown in FIG. 2, the connection structure A has a space penetrating between the conductor connecting portions 12, 12 formed by welding the temperature measuring conductor 6 of the temperature measuring means 1 and the conductor 10 of the extension cable 2. Part 13
And the end portion of the sheath tube 5 and the end portion of the sheath wire portion 11 are integrally resin-molded by the first resin connecting member 3. The twelve are isolated from each other and insulated. Furthermore, as shown in FIG. 1, the second resin connecting member 4 is integrally resin-molded on the first resin connecting member 3 so that the void 13 is also covered. This second resin connecting member 4
Is capable of forming a substantially uniform resin layer on the outer peripheral portion of the first resin connecting member 3 to improve the appearance and maintain the sealing property, and at the same time, the working efficiency can be greatly improved. Further, the illustrated void portion 13 is formed by penetrating substantially the center of the first resin connecting member 3, but may be a bottomed hole portion without penetrating in particular.
Although not particularly shown, the entire side temperature device is constructed by connecting the extension cable 2 to a temperature indicator or the like.

Next, a method of molding the connection structure A of the first embodiment will be described with reference to the resin mold 14 shown in FIGS.

As shown in FIG. 3, the resin mold 14 is a mold in which a primary molding mold 15 and a secondary molding mold 16 are assembled in the same mold. Upper mold 15a and lower mold 15
3b, each mold 15a, 15b is provided with a first cavity 17 having a size capable of inserting both ends of the temperature measuring means 1 end and the extension cable 2 end as shown in FIGS. 15
The partition wall 18 is erected from approximately the center of b. Similarly,
The secondary molding die 16 is also composed of an upper die and a lower die, and can be resin-molded by further covering the first resin connecting member 3 which is injection-molded and connected by the primary molding die 15. Having a second cavity 19 of a size, these first cavities being
A resin flow path 20 'that shares a sprue 20 that communicates 17 with the second cavity 19 is provided, and adjustment is possible with runner portions 22a and 22b having opening and closing pins 21a and 21b provided for each cavity.

Further, a method of connecting the conductive wires for molding the connection structure A using the resin mold 14 of FIG. 3 will be described. First, as shown in FIGS. 4 and 5, a primary molding die 15 is used to connect the end of the sheath tube 5 of the temperature measuring means 1 and the end of the outer sheath wire portion 11 of the extension cable 2 into the primary cavity 17. And the conductor 10 of the temperature measuring means 1 and the conductor 10 of the extension cable 2 are welded and connected to each other. In this state, the secondary opening / closing pin 21b of the secondary runner portion 22b is closed and the primary opening / closing pin 21a of the primary runner portion 22a is opened to flow the resin from the sprue 20 into the primary cavity 17 through the resin flow passage 20 '. Then, by injection molding, the temperature measuring conductor 6 of the temperature measuring means 1 and the conductor 10 of the extension cable 2 are integrally made of resin by the first resin connecting member 3 having the void portion 13 communicating with the outside as shown in FIG. It is molded. Thereafter, as shown in FIG. 3, using the secondary molding die 16, the first opening / closing pin 21a of the primary runner portion 22a is closed while the first resin connecting member 3 is positioned in the secondary cavity 19. Secondary runner part 22b-2
The next opening / closing pin 21b is opened to connect the sprue 20 to the resin flow path 20 '.
This can be performed by injecting a resin into the secondary cavity 19 through the injection molding and injection molding the resin with the second resin connecting member 4 as shown in FIG.

In addition, the connection structure A of the second embodiment will be described with reference to FIG. Connection structure A of the second embodiment
Are fitted with insert metal fittings 23 and 24 on the end of the sheath tube 5 of the temperature measuring means 1 and the end of the jacket wire portion 11 of the extension cable 2, respectively, and the first resin is used as in the connection structure A of the first embodiment. The connection member 3 and the second resin connection member 4 are integrally resin-molded. As shown in FIG. 6, the insert metal fitting 24 at the end of the extension cable 2 is formed by fitting a ring member onto the tip of the outer sheath wire portion 11 of the extension cable 2 during the molding process. When the wire portion 11 is directly held by the resin mold 14,
If a soft resin or the like is used for the outer cover wire portion 11, stable molding may not be possible due to resin pressure, etc.Therefore, in order to reinforce, the outer diameter of the insert metal fitting 24 is unified to the minimum, The purpose is to reduce the required number of resin molds by preparing an inner diameter corresponding to the size of the jacket wire portion 11 of the extension cable 2. Further, as shown in FIG. 6, the insert metal fitting 23 at the end of the sheath tube 5 of the temperature measuring means 1 has a thermosetting resin on the end of the sheath tube 5 in order to prevent moisture absorption of the insulating material 7 enclosed inside during the process as shown in FIG. And the like, and the outer diameter of the insert metal fitting 23 is unified to the minimum, and the inner diameter is set to the size of the sheath tube 5 like the insert metal fitting 24 of the extension cable 2. The purpose is to reduce the number of required resin molds by preparing the corresponding one.

The material of the insert metal fitting 23 of the temperature measuring means 1 and the insert metal fitting 24 of the extension cable 2 is made of metal in this embodiment, but is not limited to a resin molded product. It may be.

In addition, the connection structure A of the third embodiment will be described with reference to FIGS. 7 to 9. In the connection structure A of the third embodiment, as shown in FIG. 9, the sensor unit 26 held in the mounting bracket 25 and the extension cable 2 are connected at right angles to each other to form the resistor 27.
As in the connection structure A described above, as shown in FIG. 8, the insert metal fitting 24 is externally fitted to the side temperature conducting wire 6 and the jacket wire portion 11 on which the resin insulating material 9 of the sensor portion 26 is covered. The three conductor connecting portions 12 with the conductor 10 of the extension cable 2 are separated from each other and integrally molded with the first resin connecting member 3 and the second resin connecting member 4. Furthermore,
Similarly, although not particularly shown, the extension cable 2 can be attached to the temperature indicator,
The entire side temperature device is constructed by connecting the. In addition, the temperature measuring means 1 can be used in a thermistor or the like in addition to this, and can also be applied to connection with another sensor.

The extension cable and the extension cable connection structure B will be described with reference to FIG. Connection structure B
Is the conductor of the extension cable 2 with the insert fitting 24 fitted
Although 10 members are integrally resin-molded by the first resin connecting member 3 and the second resin connecting member 4, the first resin connecting member 3 is made of a soft resin such as polyethylene so as to have flexibility. The second resin connecting member 4 has a different structure and a soft resin containing glass fiber is used to firmly protect the connecting portion. Thus, it can be applied to various conductor connection structures.

As described above, by using the connecting structure A of the first to third embodiments, the temperature measuring wire 6 of the temperature measuring means 1 is obtained.
And the conductor wire 10 of the extension cable 2 are welded to form conductor wire connecting portions 12, 12 which are integrally resin-molded by the first resin connecting member 3 so as to have a void portion 13 penetrating between them. Since the second resin connecting member 4 is integrally resin-molded by covering the connecting member 3 so that the void 13 is also filled, the short circuit phenomenon can be completely prevented.
Further, mass production is possible by a series of integral molding using the resin mold 14, and moreover, since the second resin connecting member 4 is connected on the first resin connecting member 3,
By forming a substantially uniform resin layer on the outer periphery without exposing the conducting wires 6 and 10, the appearance is adjusted and the sealing property is maintained, the working efficiency can be greatly improved.

In particular, when the connecting structure A of the second embodiment is used, as shown in FIG. 6, inserts are made at the end of the sheath tube 5 of the temperature measuring means 1 and at the end of the outer sheath wire portion 11 of the extension cable 2. Metal fittings
Since 23 and 24 are externally fitted and resin-molded by the first resin connecting member 3, respectively, the outer diameters of the insert fittings 23 and 24 are unified to the minimum, and the inner diameter is the outer sheath wire portion of the extension cable 2. It is possible to reduce the number of resin molds by preparing the one corresponding to the size of 11.

[0023]

According to the conductor connecting structure, the temperature measuring device using the connecting structure, and the method of manufacturing the temperature measuring device according to the present invention, for example, the temperature measuring conductor of the temperature measuring means and the conductor of the extension cable are welded. The first resin connecting member is integrally resin-molded so as to have a void portion penetrating between the conductor connecting portions formed as described above, and the outer cover is formed on the first resin connecting member so that the void portion is also filled. Since the second resin connecting member is integrally resin-molded, the short-circuit phenomenon can be completely prevented, and mass production is possible by a series of resin molding using a resin mold. Moreover, since the second resin connecting member is connected on the first resin connecting member, a substantially uniform resin layer is formed on the outer peripheral portion without exposing the conducting wire to the outside, and the appearance is adjusted and the sealing property is improved. Work efficiency is significantly improved at the same time Than is possible.

[Brief description of drawings]

FIG. 1 is an explanatory view of a partial cross-sectional state of a connection structure of a temperature measuring means and an extension cable in the first embodiment.

FIG. 2 is a vertical cross-sectional view showing a connected state by the first resin connecting member.

FIG. 3 is a plan view showing a resin mold of a connection structure of a temperature measuring means and an extension cable.

FIG. 4 is a transverse sectional view of the first molding die.

FIG. 5 is a vertical sectional view of the first molding die.

FIG. 6 is an explanatory view of a partial cross-sectional state of the connection structure between the temperature measuring means and the extension cable in the second embodiment.

FIG. 7 is a perspective view of a resistor using the connection structure of the temperature measuring means and the extension cable in the third embodiment.

FIG. 8 is a cross-sectional view of the same resistor.

FIG. 9 is a vertical sectional view of the resistor.

FIG. 10 is an explanatory view of a partial cross-sectional state of the extension cable and the connection structure of the extension cable in the representative embodiment.

[Explanation of symbols]

 A Connection structure between temperature measuring means and extension cable B Connection structure between extension cable and extension cable 1 Temperature measuring means 2 Extension cable 3 First resin connection part 4 Second resin connection part 5 Sheath tube 6 Temperature measurement lead wire 7 Insulation material 8 Resin Sealing member 9 Resin insulating material 10 Conductor wire 11 Outer wire portion 12 Conductor wire connection portion 13 Void portion 14 Resin mold 15 Primary molding mold 16 Secondary molding mold 17 Primary cavity 18 Partition wall 19 Secondary cavity 20 Sprue 21 Open / close pin 22 Runner 23 Insert metal fitting 24 Insert metal fitting 25 Mounting metal fitting 26 Sensor part 27 Resistor

Claims (3)

[Claims] 1. A conductor connecting structure characterized by being integrally resin-molded by a first resin connecting member such that a second resin connecting member is interposed between a conductor connecting portion of one conductor and the other conductor. 2. The first resin connecting member is integrally resin-molded so as to have a void portion communicating with the outside between the temperature measuring conductor of the temperature measuring means and the conductor connecting portion of the conductor of the extension cable.
A temperature measuring device characterized in that a temperature measuring means and an extension cable are connected to each other by integrally molding a resin with a second resin connecting member so that the void is filled on the resin connecting member. 3. A primary cavity having a primary cavity in which a partition wall for separating a conductor connecting portion of one conductor from another conductor is erected.
Using a secondary molding die, molding in a state in which the partition wall is located between the conductor connecting portions connecting the temperature measuring conductor of the temperature measuring means and the conductor of the extension cable, and molding is performed. The step of integrally resin-molding the temperature-measuring wire of the temperature-measuring means and the wire of the extension cable with the first resin connecting member having a void communicating with the outside, and integrally molding the resin with the primary molding die. By using a secondary molding die having a secondary cavity that can be resin-molded by covering the first resin connecting member, the first resin connecting member is molded in a state of being positioned in the cavity. Two
A method of manufacturing a temperature measuring device, which comprises a step of resin molding with a resin connecting member.