JP2921344B2 - Conductive wire connection structure, temperature measurement device using the connection structure, and method of manufacturing temperature measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to connecting an extension cable to a temperature measuring means such as a thermocouple covered with a sheath tube,
By connecting the extension cable and the extension cable integrally by using synthetic resin, it is possible to connect the conductor without causing a short circuit phenomenon, and to manufacture a lead wire connection structure, a temperature measuring device using the connection structure, and a temperature measuring device. About the method.

[0002]

2. Description of the Related Art Conventionally, a temperature measuring lead wire of a thermocouple covered with a sheath tube such as a stainless steel tube or the like and an extension lead wire of an extension cable are respectively drawn out and connected to each other, and a sheath tube end and a shield wire end of the extension cable are connected. And those connected integrally by synthetic resin.

[0003]

However, according to the conventional method, in order to prevent a short circuit, each conductor is bent and formed to maintain the distance between the conductors or to be connected to the connection between the conductors. After winding the tape or applying a coating process, it is integrally molded with synthetic resin and connected, but such work is very labor-intensive, and even if such a process is performed, the synthetic resin When integrally molded by using the same method, it is impossible to completely prevent a short circuit phenomenon because the connecting portions of the conductors may move and come into contact with each other, and the conductors are exposed from the resin surface. was there.

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

[0005]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
Between the conductor connection of one conductor and the other
The first resin connecting member is connected to the first resin connecting member so as to have a communicating cavity.
The resin is molded into the body, and the first resin connecting member
Is formed integrally with the second resin connection member so that
It is characterized by connecting the conductor and the conductor by shaping
Is what you do.

Also, in order to achieve the above object, the connection structure of the conductor is applied to a temperature measuring device, and an external connection is provided 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 cavity communicating with the first resin connecting member, and the second resin connecting member is integrally resin-molded on the first resin connecting member so as to be filled in the cavity. In this case, the temperature measuring means and the extension cable are connected.

Further, as a method of manufacturing the temperature measuring device, a primary molding die having a primary cavity in which a partition for vertically separating a conductor connecting portion between one conductor and the other conductor is provided, is used. Forming the primary cavity so that the partition wall is located between the conductor connecting parts connecting the temperature measuring conductor of the means and the conductor of the extension cable, and having a cavity communicating with the outside. A step of integrally resin-molding the temperature-measuring lead of the temperature-measuring means and the conductor of the extension cable with the first resin connecting member; Forming a first resin connecting member in the cavity by using a secondary molding die having a secondary cavity capable of resin molding by covering the second resin connecting member with the second resin connecting member; It is a method consisting of

[0008]

As described above, according to the lead wire connection structure, the temperature measuring device using the connection structure and the method of manufacturing the temperature gauge according to the present invention, for example, when the temperature measuring means and the extension cable are connected as the lead wire connection structure. Using a primary molding die having a primary cavity in which a partition is provided upright to separate a conductor connecting portion between one conducting wire and the other conducting wire, the temperature measuring conductor of the temperature measuring means is connected to the conductor of the extension cable. The first resin connecting member having a cavity communicating with the outside is formed by molding in a state where the partition is located in the primary cavity such that the partition wall is located between the conductive wire connecting portions. And a conductor of the extension cable are integrally molded with resin, and thereafter, a secondary cavity is formed by resin covering the first resin connecting member integrally molded with the first molding die. Using the next molding die, The resin connecting member in the second resin connecting member in a state of being positioned in the cavity is to resin molding.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a connection structure A (hereinafter simply referred to as a connection structure A) between a temperature measuring means and an extension cable in the first embodiment. Specifically, the resin mold shown in FIGS. 3 to 5 is used. It can be manufactured using.

As shown in FIG. 1, a connection structure A is formed by connecting an end of a temperature measuring means 1 and an end of an extension cable 2 to a first resin connecting member 3.
And the second resin connecting member 4 is integrally connected by resin molding. The first resin connecting member 3 and the second resin connecting member 4 can be made of a soft resin or a hard resin, respectively.
It is possible to use a homogeneous resin or a different resin.

The temperature measuring means 1 uses a thermocouple as shown in FIG. 2, and uses a temperature measuring wire 6 and an insulating material such as MgO and Al ₂ O _{3 in} a sheath tube 5 made of stainless steel. The material 7 is inserted, the temperature measuring lead wire 6 is drawn out, and the end is filled with a resin sealing member 8.

As shown in FIG. 2, the extension cable 2 is composed of two conductors 10 covered with a resin insulating material 9, two members made of glass braid or a metal wire, and a part 11 made of a soft synthetic resin. The conductive wire 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 gap penetrating between the conductor connecting portions 12 formed by welding the temperature measuring conductor 6 of the temperature measuring means 1 and the conductor 10 of the extension cable 2 or the like. Part 13
Is formed integrally with the first resin connecting member 3 including the end portion of the sheath tube 5 and the end portion of the sheath wire portion 11, and the conductor connecting portion 12, The 12 are isolated from each other and insulated. Further, as shown in FIG. 1, the first resin connecting member 3 is covered so as to fill the gap 13, and the second resin connecting member 4 is integrally molded with the resin. This second resin connection member 4
Is that a substantially uniform resin layer is formed on the outer peripheral portion of the first resin connecting member 3 so that the appearance is adjusted and the sealing property is maintained, and at the same time, the working efficiency can be greatly improved. In addition, the illustrated gap portion 13 penetrates substantially the center of the first resin connection member 3, but may be a bottomed hole without penetrating.
Then, although not particularly shown, by connecting the extension cable 2 to a temperature indicator or the like, the entire side temperature device is constituted.

Next, a method for forming the connection structure A according to 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 has a primary molding die 15 and a secondary molding die 16 incorporated in the same die. Upper mold 15a and lower mold 15
The first cavities 17 are formed in each of the molds 15a and 15b and have a size such that both ends of the temperature measuring means 1 end and the extension cable 2 end can be inserted as shown in FIGS. Fifteen
A partition 18 is provided upright from substantially the center of b. Similarly,
The secondary molding die 16 is also composed of an upper die and a lower die, and is further covered on the first resin connecting member 3 to be connected by injection molding with the primary molding die 15 so that resin molding is possible. Having a second cavity 19 of size
A resin flow path 20 'sharing a sprue 20 for communicating the 17 with the second cavity 19 is provided, and can be adjusted by runner portions 22a and 22b having opening and closing pins 21a and 21b provided for each cavity.

Further, a description will be given of a method of connecting a conductor for forming the connection structure A using the resin mold 14 of FIG. First, as shown in FIGS. 4 and 5, the end of the sheath tube 5 of the temperature measuring means 1 and the end of the sheath wire 11 of the extension cable 2 are placed in the primary cavity 17 using a primary molding die 15. 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 the primary cavity 17 so that the partition wall 18 is located between the conductor connection parts 12 and 12 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 path 20 '. By injection molding, as shown in FIG. 2, the first resin connecting member 3 having the cavity 13 communicating with the outside, the temperature measuring lead 6 of the temperature measuring means 1 and the lead 10 of the extension cable 2 are integrally formed of resin. It is molded. Thereafter, as shown in FIG. 3, the primary 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 using the secondary molding die 16. 2 of the secondary runner part 22b
Open the next opening / closing pin 21b to open the resin flow path 20 'from the sprue 20.
By injecting the resin into the secondary cavity 19 through the through-hole and performing injection molding, the resin can be molded by the second resin connecting member 4 as shown in FIG.

In addition, a connection structure A of the second embodiment will be described with reference to FIG. Connection structure A of second embodiment
The insert fittings 23 and 24 are fitted to the end of the sheath tube 5 of the temperature measuring means 1 and the end of the sheath wire 11 of the extension cable 2, respectively, and the first resin is connected similarly to the connection structure A of the first embodiment. The connection member 3 and the second resin connection member 4 are integrally formed of resin. As shown in FIG. 6, the insert metal fitting 24 at the end of the extension cable 2 has a ring member externally fitted in the middle of the distal end of the sheath wire portion 11 of the extension cable 2. When the wire portion 11 is directly held by the resin mold 14,
If a soft resin or the like is used for the sheath wire portion 11, stable molding may not be performed due to resin pressure or the like, so that reinforcement is performed, and the outer diameter of the insert fitting 24 is unified to a minimum one, The purpose is to reduce the number of required resin molds by preparing an inner diameter corresponding to the size of the sheath wire portion 11 of the extension cable 2. Further, as shown in FIG. 6, the insert fitting 23 at the end of the sheath tube 5 of the temperature measuring means 1 is provided with a thermosetting resin at the end of the sheath tube 5 in order to prevent the insulating material 7 sealed therein during the process from absorbing moisture. And the like, and the outer diameter of the insert 23 is unified to the minimum like the insert 24 of the extension cable 2, and the inner diameter is reduced to the size of the sheath tube 5. The purpose is to reduce the number of required resin molds by preparing corresponding ones.

The insert 23 of the temperature measuring means 1 and the insert 24 of the extension cable 2 are made of metal in the present embodiment. There may be.

In addition, a connection structure A according to a third embodiment will be described with reference to FIGS. As shown in FIG. 9, the connection structure A according to the third embodiment connects the sensor section 26 held in the mounting bracket 25 and the extension cable 2 at a right angle, and
In the same manner as the connection structure A described above, as shown in FIG. 8, the insert metal fitting 24 is externally fitted to the side heating conductor 6 and the sheath wire 11 of the sensor 26 covered with the resin insulating material 9 as shown in FIG. The three conductor connection portions 12 of the extension cable 2 and the conductor 10 are separated from each other, and are integrally molded with the first resin connection member 3 and the second resin connection member 4. Furthermore,
Similarly, although not particularly shown, an extension cable 2 is used for a temperature display or the like.
Is connected to form the entire side temperature device. In addition, the temperature measuring means 1 can be used for a thermistor or the like in addition to the above, and can also be applied to connection with another sensor.

A connection structure B between extension cables will be described with reference to FIG. Connection structure B
Is the conductor of the extension cable 2 fitted with the insert fitting 24
The first resin connection member 3 and the second resin connection member 4 are integrally resin-molded. However, the first resin connection member 3 is made flexible by using a soft resin such as polyethylene. The connection portion is firmly protected by using a soft resin containing glass fiber as the second resin connection member 4. In this way, it can be applied to various connection structures of conductors.

As described above, by using the connecting structure A of the first to third embodiments, the temperature measuring lead wire 6 of the temperature measuring means 1 can be used.
The first resin connecting member 3 is integrally resin-molded so as to have a gap 13 penetrating between the wire connecting portions 12 formed by welding the wire 10 of the extension cable 2 and the first resin. Since the second resin connecting member 4 is integrally formed with the resin by covering the connecting member 3 so as to be filled also in the gap 13, the short circuit phenomenon can be completely prevented.
Furthermore, mass production can be performed by a series of integral molding using the resin mold 14, and since the first resin connecting member 3 is connected to the first resin connecting member 3 by the second resin connecting member 4,
A substantially uniform resin layer is formed on the outer peripheral portion without exposing the conductive wires 6 and 10 to the outside, the appearance is adjusted, the sealability is maintained, and 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, an insert is inserted into the end of the sheath tube 5 of the temperature measuring means 1 and the end of the sheath wire 11 of the extension cable 2. Metal fittings
Since the first and second resin connection members 3 and 24 are externally fitted and molded with the first resin connection member 3, respectively, the outer diameters of the insert fittings 23 and 24 are unified to the minimum and the inner diameters of the outer cable portion of the extension cable 2 are respectively reduced. By preparing an article corresponding to the size of 11, the number of resin molds can be reduced.

[0023]

According to the lead wire 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 lead wire of the temperature measuring means and the lead wire of the extension cable are welded. Communication between external conductors
The first resin connecting member is integrally molded with a resin so as to have a gap, and the first resin connecting member is covered so as to be filled in the gap, and is integrally formed with the second resin connecting member. Since the resin molding is used, the short circuit phenomenon can be completely prevented, mass production can be performed by a series of resin molding using a resin mold, and the second resin is formed on the first resin connecting member. Since the connection is made with a resin connecting member, a substantially uniform resin layer is formed on the outer periphery without exposing the conductive wire to the outside, the appearance is adjusted, the sealing performance is maintained, and at the same time the work efficiency can be greatly improved. is there.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a connection state by a first resin connection member.

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

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

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

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

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

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

FIG. 9 is a longitudinal sectional view of the same resistor.

FIG. 10 is an explanatory diagram of a partial cross-sectional state of a connection structure between extension cables in an exemplary embodiment.

[Explanation of symbols]

 Reference Signs List A Connection structure between temperature measuring means and extension cable B Connection structure between extension cable and extension cable 1 Temperature measurement means 2 Extension cable 3 First resin connection part 4 Second resin connection part 5 Sheath tube 6 Temperature measurement lead 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 die 15 Primary molding die 16 Secondary molding die 17 Primary cavity 18 Partition wall 19 Secondary cavity 20 Sprue 21 Opening / closing pin 22 Runner 23 Insert bracket 24 Insert bracket 25 Mounting bracket 26 Sensor unit 27 Resistor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01K 7/02 G01K 7/00 H01R 4/62

Claims (3)

(57) [Claims] 1. A lead wire connecting portion between one lead wire and the other lead wire.
First resin connection so as to have a void portion communicating with the outside between
The resin is integrally molded with the member, and on this first resin connecting member,
The second resin connecting member is used to fill the gap.
The conductor is connected to the conductor by resin molding on the body.
And a connection structure for a conductive wire. 2. The first resin connecting member integrally forms a resin between the temperature measuring lead wire of the temperature measuring means and the lead wire connecting portion of the extension cable so as to have an air gap communicating with the outside.
A temperature measuring device, wherein the temperature measuring means and the extension cable are connected by integrally molding the resin with the second resin connecting member so that the gap is filled in the resin connecting member. 3. A primary cavity having an upright partition wall for separating a conductor connecting portion between one conductor and the other conductor.
Molding using a mold for secondary molding, with the temperature measuring means positioned in the primary cavity so that the partition wall is located between the conductor connecting parts connecting the temperature measuring conductor and the extension cable conductor. A step of integrally resin-molding the temperature-measuring lead of the temperature-measuring means and the conductor of the extension cable with the first resin connecting member having a void portion communicating with the outside; and resin molding integrally with the primary molding die. By using a secondary molding die having a secondary cavity capable of resin molding by covering the first resin connecting member, the first resin connecting member is molded with the first resin connecting member positioned in the cavity. 2
Forming a resin with a resin connecting member; and a method for manufacturing a temperature measuring device.