JPS60334A - Fitting device of heat-sensitive element - Google Patents

Abstract

PURPOSE:To reduce the heat capacity of a heat-sensitive element and to improve heat responsiveness by forming a freely movable air layer around the heat-sensitive element and forming a cover consisting of a molded resin around the air layer. CONSTITUTION:An drawing electrode 8 of the heat-sensitive element 1 and a core 2 of a twisted wire 4 are caulked and connected by a caulking terminal 16. The freely movable air layer M is formed around the heat-sensitive element 1 and the resin cover 17 molded with a resin is formed on the outside of the air layer M. A penetration hole 18 for ventilation is arranged on a position opposed to the heat-sensitive element 1 on the wall surface of the resin cover 17. The resin cover 17 has a cylindrical part 2 arranged with a pitch size almost equal to the bending size of the drawing electrode 8 of the heat-sensitive element 1 and the twisted wire 4 is inserted into the cylindrical part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to several configurations of a heat-sensitive element for selecting operating conditions of an electrical appliance that has an electric control device and controls the operation of the appliance.

Conventional Structures and Problems NTC thermistors are used as heat-sensitive elements in electrical equipment, and they come in various shapes.

Conventional examples are shown in FIGS. 1, 2, and 3. In FIG. 1, 1 is a thermistor element, and 2 is a core wire of a stranded wire 4 that transmits the resistance value of the thermistor 1 to a control device (not shown). 3 is a resin holder for preventing the thermistor 1 and core wire 2 from being exposed by hermetically sealing them, and 6 is a resin holder for holding the deflection wire 4 and fixing it to the metal chassis 6 of the electric device. A is a tightening screw for firmly holding the stranded wire 4 in the resin holder 5. This tightening screw 7 is attached to the metal chassis 6 with a screw thread (
(not shown).

Figure 2 shows lead 8 from thermistor 1 and stranded wire 4.
A soldering connection is made between the core wire 2 and the core wire 2 using solder 9. Further, a heat shrink tube 10 covers the live parts of the thermistor 1, the core wire 2, and the solder 9, and the tube 10 is in close contact with the skin of the thermistor 1 and the stranded wire 4. This tube 10
Two stranded wires 4 are fastened from the outside with a metal holder 11. This holder 11 is fixed using a screw in a round hole 14 so as to observe the demand level of the temperature-measured environment. Here, 402 stranded wires are connected to a control device (not shown).
The electrical circuit 7 to which this server star 1 is attached is connected to
This configuration is used to observe the environmental temperature of the rice ware.

In FIG. 3, a thermistor element (not shown) is connected to a single lead wire 8 by contacting it, and then sealed in a resin mold 3 as shown in FIG. 1.

An insulating resin vibrator 12 is arranged on one side of the two lead wires 8, and the lead wire 8 is attached to the printed wiring board 13.
Insert and fix the thermistor lead wire 8 by soldering. Each of the two lead wires 8 is connected to the printed circuit board 13 by caulking to the stranded wire 4 that transmits observed temperature information to the control device (not shown) by wiring copper foil (not shown) provided on the printed wiring board 13. It transmits the environmental temperature information observed by the thermistor to the inserted and connected tank 15. 14 provided on the splint board 13 is fixed using screws so as to observe the temperature of the environment to be measured.

As mentioned above, in the configuration shown in Fig. 1, the resin 3 is packed around the thermistor 1, which prevents the live parts from being exposed and at the same time allows the environmental temperature to be transmitted to the thermistor 1 due to the thermal conduction of the resin 3. is transmitted to thermistor 1. This heat conduction cannot be said to have a sensitive thermal response in that environmental by-products will not be transmitted to the thermistor 1 unless the environmental temperature change causes a sufficient temperature change in the resin 39. In addition, it is difficult to accurately control the amount of resin 3 that adheres to the area around the thermistor 1, so when many items with the same shape are manufactured, variations in thermal response occur each time, making it difficult for electrical equipment to be mass-produced. could cause problems with control. Furthermore, since the two strands of stranded wire 4 are fixed in one place with the holder 5,
Vibration and impact during transportation of electrical equipment act on the resin around the thermistor 1, and stress is applied to the bundled portion of the stranded wire 4 in the holder 5. When transporting over long distances, the stranded wire 4 There was a time when I would introduce a disconnection.

At the same time, changes in ambient temperature are transmitted to the thermistor 1 via temperature changes in the tube 1o.

In other words, even in the case of FIG. 2, since temperature changes are transmitted to the thermistor 1 by heat conduction through the tube 10, it cannot be said that the thermal response to changes in the width of the thermistor 1 with respect to changes in ambient temperature is sensitive.

However, in the case of Figure 1, the problem is that the variation in thermal response due to the uneven amount of resin mold is caused by the tube 1
Since o can be set to a uniform film thickness, it is possible to set uniform conduction characteristics as a thermal conductor, so it is possible to suppress variations in thermal response when used as a thermal element configuration for mass-produced electrical equipment. ing. Moreover, the holder 1 shown in FIG.
1 has a configuration in which the stranded wire 4 is sandwiched through the tube 10, so even if the electrical equipment is subjected to vibration shock during transportation,
Instead of just bundling the bendable horizontal υ wires 4 as shown in Fig. 1, they are covered with the same material from the bundled part to the tip of the thermistor 1 by the tube 10, so that the thermistor 1 can be connected using the bundled part by the holder 11 as a fulcrum. The parts do not vibrate too much. Therefore, the stranded wire 4 will not break due to vibrations during long-distance train transportation. However,
Figure 1.

Positioning, which is a common problem in FIG. 2, may be incomplete. The holder 11 has one hole for fixing a screw, and after tightening the screw, when force is applied to the horizontal wire 4 for connecting to the control device, the thermistor 1 rotates around the screw tightening part. The temperature measurement position may deviate from the desired temperature measurement position. As a result, there remains a problem that there is a risk that operation control of electrical equipment cannot be obtained through normal temperature observation. Figure 3 shows an improvement that focused on this point. In FIG. 3, there are two screw holes 1 in a printed wiring board 13 that has the function of connecting and holding the lead wire 8 from the thermistor and the tip terminal 15 of the stranded wire 4 connected to the control device.
4 is provided in order to position the thermistor. The problem with this figure 3 is that the live parts are exposed, there is a risk that metal fittings of other electrical equipment may touch the solder (not shown) of the terminal 16 or the copper foil part, and there is also a risk of dust accumulation and moisture absorption. As a result, the circuit insulation resistance on the control circuit decreases, which affects the control function, making it impossible for the electrical equipment to operate normally. In this respect, in FIGS. 1 and 2, the above-mentioned problem does not occur because the charging portion is completely sealed.

As mentioned above, there are problems with Yoshadama, and here we have considered ways to solve these problems all at once.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks.The present invention reduces the heat capacity of the heat-sensitive element and reduces the thermal responsiveness of the temperature-sensitive characteristic to changes in ambient temperature, that is, the thermal time constant. The purpose is to realize quick motion control for.

Structure of the Invention In order to achieve the above object, the heat-sensitive element mounting device of the present invention is in direct contact with the observed environmental air and is covered with a resin cover, so that the heat-sensitive element is not affected by changes in the ambient air temperature. Temperature changes can be made quickly, which means that thermal responsiveness is improved by eliminating the need for heat conduction through resin, which is a poor thermal conductor, as in the conventional case. Furthermore, since it is covered with a resin cover, there is an effect that other metals cannot directly touch the charged metal part of the heat-sensitive element part.

Furthermore, by providing one hole in the wall surface facing the heat-sensitive element of the resin cover of the present invention, there is an effect that it is difficult to generate a temperature difference between the air outside the cover and the air inside the resin cover, and the environmental air temperature To promptly transmit changes in temperature to a heat-sensitive element.

In addition, since the outer diameter of the Cannes end is almost equal to the thickness of the space created by the resin cover, and the outer diameter of the heat-sensitive element is smaller than the outer diameter of the caulking terminal, and it is larger than the hole diameter through which the stranded wire passes, due to equal pressure, The position where the heat sensitive element is kept inside the resin cover is always kept constant, and the distance from the gastric passage provided in the wall surface of the resin cover can also be kept constant, and the distance between the wall surface and the heat sensitive element can also be kept constant.

The width of the resin cover is slightly smaller than the sum of the bending dimension of the lead electrode of the heat-sensitive element and the outer diameter of the crimped terminal, so the heat-sensitive element electrode and the stranded wire core wire are connected inside the resin cover using the crimped terminal. If they are arranged in a configuration in which they are connected by caulking at the same time, pressing force is constantly applied from the resin cover to the caulking terminals. By setting the thickness of the wall surface of the resin cover facing the heat-sensitive element to 1.0+0.3 mm, the pressing force applied from the resin cover to the caulking terminal can be kept stable, and the wall surface of the resin cover does not come into contact with the heat-sensitive element.

In addition, by providing a resin film between the two cylindrical parts of the resin cover through which the stranded wires are passed, and by providing direct through holes, this resin cover can function as a boulder when installing electrical equipment. By making the diameter smaller than the cylindrical outer shape, it is possible to obtain the effect of a stopper as a rotation stopper when configuring electrical equipment.

Furthermore, since the exposed dimension of the core wire and the dimension beyond the bending position of the lead-out electrode of the heat-sensitive element are equal to or greater than the length of the crimped terminal, when the crimped terminal is crimped, Insert the core wire of the stranded wire and the extraction electrode of the heat-sensitive element into the round hole of the caulking terminal, and
This allows you to visually check whether the core wire or lead electrode has arrived.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

4 to 8, the lead electrode 8 of the heat-sensitive element 1 and the core wire 2 of the stranded wire 4 are crimped and connected using the crimped terminal 16. A freely movable air layer M is provided around the heat-sensitive element 1, and a resin cover 17 made of resin is provided outside the air layer M.

A through hole 18 for ventilation is provided on the wall surface of this resin cover 17 at a position facing the heat sensitive element 1. Also, caulking terminal 1
The outer diameter a of the heat-sensitive element 6 and the length b of the minimum side of the substantially rectangular parallelepiped space in which the heat-sensitive element 1 is arranged inside the resin cover 17 are approximately equal, and the outer diameter m of the heat-sensitive element is the same as that of the caulking terminal. 16
It is smaller than the outer diameter a of the resin cover 1. ll
The hole diameter C of the hole through which the wire 4 is passed is configured to be smaller than the outer diameter a of the caulking terminal 16. Also, [1] dimension d of the approximately rectangular parallelepiped space in which the heat-sensitive element 1 is arranged inside the resin cover 17.
For example, the dimension is slightly smaller than the sum of the bending dimension e of the lead-out electrode 8 of the heat-sensitive element and the outer diameter a of the caulking terminal 16 (e + a). In addition, the thickness f of the cover wall surface facing the heat-sensitive element of the resin cover 17 is 1.0±O.
-3 mm. Furthermore, resin cover 1
7 is provided with two cylindrical portions through which the stranded wire 4 passes, with a pitch g approximately equal to the bending dimension e of the extraction electrode 8 of the heat-sensitive element 1, and a resin film portion that bridges between the cylindrical portions.
A direct hole 19 is provided in this resin membrane portion, and the thickness of this resin membrane is smaller than the outer diameter l of the resin cylindrical portion through which #4 is passed. Finally, with respect to the length j of the caulking terminal 16, the exposed core wire dimension of the twisted wire 4 and the dimension 1 from the bending position of the extraction electrode 8 of the heat-sensitive element 1 are configured to be equal to or larger. ing.

FIG. 9 and FIG. 1o show how the mounting device for the heat-sensitive element 1 is fixed to the metal chassis of an electrical device. In FIG. 9, a collar 20a divided into two directions is inserted into the through hole 19 of the resin cover 17 housing the heat-sensitive element 1 shown in FIGS. 4 to 8.
A holder pin 20 holding the holder pin 20 is inserted and fixed into a round hole 22 provided in a metal fitting 21 for holding the holder bin 2o. One side of the collar 202L of the holder pin 20 is inserted into the elongated hole 23 provided near the round hole 22 for holding, and the collar 202L on the opposite side is inserted into the resin film provided with the through hole 19 of the resin cover 17. The structure is such that it suppresses the

In Figure 10, the holder pin 2o and resin cover 1 in Figure 9 are shown.
Round hole 22 and long hole 23 provided in the hole 19 of No. 7 and the metal fitting 21
It is arranged in an exploded manner so that you can see the insertion relationship between the two.

The operation of the above configuration will be explained below.

The freely movable air layer around the heat sensitive element 1 in FIGS. 4 to 8 is the ambient temperature itself, and changes in the ambient temperature are immediately transmitted to the heat sensitive element. Further, the environmental temperature outside the resin cover 17 can be quickly transmitted to the heat-sensitive element 1 through the through hole 18 provided in the wall surface of the resin cover 17. In addition, the thickness of the space created by the resin cover 17 and the caulking terminal 16
The distance between the heat-sensitive element 1 and the inner wall surface of the resin cover 17 is maintained because the outer diameter a of the heat-sensitive element 1 is almost the same and the outer diameter m of the heat-sensitive element 1 is smaller than the outer diameter a of the caulking terminal 16. This allows the thermosensitive element 1 to move freely, and eliminates the risk of the thermosensitive element 1 touching the resin cover 17.
It is possible to stabilize the heat capacity of. At the same time, by pulling the stranded wire 4 connected to the control device, the crimped terminal 16 hits the hole through which the stranded wire 4 is passed, and the crimped terminal 16 can be positioned, and at the same time, the thermal element 1 can be positioned. . In addition, since the crimp terminal 16 has a dimension (e + a) located outside the inner width dimension d of the resin cover 17, a force that tries to push the resin cover 17 apart is constantly exerted, and the resin cover 17 is pushed apart. Suddenly there is a force trying to push the caulking terminal 16 inward 9.
After pulling the crimped terminal 16 and placing the crimped terminal 16 against the hole for bending the stranded wire 4, the crimped terminal 16 does not easily move in the substantially rectangular parallelepiped space created by the resin cover 17. In addition, the heat-sensitive element 1 will not move easily, and the snow vent hole 1 for ventilation provided on the wall of the heat-sensitive element 1 and the resin cover 17 will prevent the heat-sensitive element 1 from moving easily.
The distance from the sun will not change easily. Here, by setting the wall thickness of the resin cover 17 to 100.3 mm+,
) It is possible to stabilize the force applied to the caulking terminal 16 from the above-mentioned resin force /<-17 to push it inward, and when the wall thickness of the resin cover 17 is uneven during mass production, The pushing pressure applied to the crimp terminals 16 becomes uneven, and the crimp terminals 16 easily fall into the resin cover 1.
It is possible to prevent variations in observed temperature due to instability of the position in the substantially rectangular parallelepiped space of 7, and stable operation control is possible. In addition, a flat surface is provided in a part of the resin cover 17 W.
By providing the through hole 19, the resin cover 17, which serves as a protective film for the live part of the heat-sensitive element 1, has a holder holding function for fixing the heat-sensitive element 1 to the metal chassis of an electrical device. A holder was required to hold and fix element 1, but this part was not used.
It becomes possible to fix the heat-sensitive element 1 to a metal chassis. Also, in FIGS. 9 and 10, the thickness h of the resin film provided with the through hole 19 is ! By having an outer diameter smaller than the outer diameter 1 of the tube through which the ll wire 4 is passed, the holder pin, the buckwheat 20a of >20
When pressing the resin film, the collar 20a catches on the outer diameter of the tube through which the stranded wire 4 passes, and the mutual positional relationship between the holder pin 20 and the resin cover 17 can be maintained reliably. The buckle 20a of this holder pin 20 on the opposite side of the collar 201L holding down the resin film is inserted into a long hole 23 provided near a round hole 22 provided in the metal fitting 21. This prevents the holder pin 20 from rotating around the circular hole 22. Furthermore, the resin cover 17 does not rotate around the round hole 22 as the center of rotation. As a result, when the resin cover 17 rotates, the through holes provided for ventilation around the heat-sensitive element 10 can be prevented from being blocked.

Returning to FIGS. 4 to 8, the length dimension j of the caulking terminal 16
On the other hand, by making the exposed core wire dimension equal to or larger than the dimension l from the bending part of the extraction electrode 8 of the heat-sensitive element 1, when the two are connected by caulking with the caulking terminal 16, The caulking connection between the twisted wire 2 and the extraction electrode 8 is determined by checking whether the core wire 2 and the extraction electrode 8 are visible on the side opposite to the insertion part to determine whether the insertion into the caulking terminal 16 is sufficient. We are trying to determine whether this is being done reliably. Note that if the caulking connection is incomplete, the observed temperature information obtained from the heat-sensitive element 1 will not be transmitted to the electrical equipment as regular information. This may lead to a situation in which the electrical equipment cannot operate properly, but the structure is designed to prevent this from occurring.

As described above, according to this embodiment, the thermal response of the heat-sensitive element 1 can be quickly realized in response to changes in the environmental temperature, and the live part of the heat-sensitive element 1 can be protected from other metal parts. , the effect that the heat capacity of the heat-sensitive element 1 is constant, which is obtained because the heat-sensitive element 1 does not come into contact with any other object except air, and the effect that the position of the heat-sensitive element 1 within the resin cover 17 can be reproducibly obtained. , the heat-sensitive element 1 is resin force-17
Due to the effect that it cannot be easily moved within the electrical equipment and the effect that it can be positioned reliably relative to the metal chassis within the electrical equipment,
The heat-sensitive element 1 is positioned several times within the electrical equipment, and the humidity observation position can always be set at the same position, which has the effect of providing stable temperature information for operation control. In addition, there is an effect of completely reducing the number of holders that hold the heat-sensitive element 1, and an effect of making the air movement around the heat-sensitive element 1 always under the same conditions. Furthermore, since it can be confirmed whether or not the caulking connection between the extraction electrode 8 and the core wire 2 is reliably performed, there is an effect of preventing an incomplete caulking connection.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) By having a freely movable air layer around the heat-sensitive element and providing a cover of resin molding around it,
The thermal response between the heat-sensitive element and the ambient temperature can be quickly performed, and at the same time, it is possible to prevent erroneous temperature measurement due to contact of the live part of the heat-sensitive element with other metals.

By providing a direct hole in the cover facing the heat-sensitive element, it is possible to prevent a difference between the temperature around the cover and the temperature around the heat-sensitive element from occurring.

(3) Since the outer diameter of the caulking terminal is approximately equal to the space inside the cover and larger than the diameter of the hole through which the stranded wire is passed, the heat-sensitive element can be reliably positioned within the cover.

(4) Since the space inside the cover is slightly smaller than the sum of the bending pitch dimension of the extraction electrode of the heat-sensitive element and the outer diameter dimension of the caulking terminal, the cover and the caulking terminal will press against each other. , the caulked terminal and the heat-sensitive element cannot be easily moved within the cover.

(5) By configuring the thickness of the cover wall surface to 1.0 + 0.3 mm, the force with which the cover tries to push in the crimp terminal is a uniform force when the cover is used in large quantities, and the force applied to the crimp terminal is uniform. Also, it is possible to maintain a stable state in which the heat-sensitive element cannot be easily moved.

(6) A resin film is provided between the pipes through which the girder passes through, and a direct hole is provided in this resin film, and the thickness of this resin film is set to the outside diameter of the pipe through which the υ wire passes. By making the diameter smaller, when inserting a holder pin with a brim into the direct hole, the positional relationship between the brim of the holder pin and the resin cover can be changed because the part of the step between the brim and the cover resin gets caught. (7) The exposed dimension of the core wire and the dimension beyond the bent part of the lead electrode are equal to the length dimension of the caulking terminal, or
Since it is made to be longer than the length dimension, it is possible to prevent a state in which the core wire and the lead-out electrode are not connected when the core wire and the lead-out electrode are crimped at the same time with the crimping terminal.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional perspective view showing how a conventional heat-sensitive element is installed, FIGS. 2 and 3 are partial cross-sectional perspective views showing how another conventional heat-sensitive element is installed, and FIG. 4(a) . 5(b) is a sectional view and a front view of part 1 of the new side of the present invention, 1. A thermal element expansion device', and FIGS. 5(a) to 5(C) are a plan view and a front view of the device, A bottom view, FIG. 6 is a front view of the same element, FIGS. 7(a) and (b) are a front view and sectional view of the same caulking terminal, FIG. 8 is a front view of the main part of the same stranded wire, and FIG. 9 1 is a perspective view showing the installed state of the device, and FIG. 10 is an exploded view of the main parts thereof. 1... Heat sensitive element, 2... Core wire, 4... Old stranded wire, 16... Caulking terminal, 17...
...Resin cover, 18... through hole. Name of agent: Patent attorney Toshio Nakao (1st person)
figure? Figure 5 Figure 6 I

Claims (1)

[Scope of Claims] 0) A heat-sensitive element whose resistance value changes according to a change in ambient temperature, an extraction electrode of the heat-sensitive element, a wire that guides the resistance change of the heat-sensitive element to a control device, and the drawer. A configuration including a caulking terminal for connecting an electrode and the stranded wire, and a resin cover covering the heat-sensitive element and the caulking terminal, and providing a freely movable air layer between the heat-sensitive element and the resin cover. A mounting device for a heat-sensitive element. (2) The heat-sensitive element mounting device according to claim 1, wherein a through hole for ventilation is provided in the wall surface of the resin cover facing the heat-sensitive element. (3) The caulking terminal has an outer diameter approximately equal to the length of the smallest side of the approximately rectangular parallelepiped space in which the heat-sensitive element is arranged inside the resin cover, and is larger than the hole diameter for passing the stranded wire in the resin molded cover. The heat-sensitive element mounting device according to claim 1, wherein the heat-sensitive element has an outer diameter. (4) A patent in which the width of the approximately rectangular parallelepiped space in which the heat-sensitive element is placed inside the resin cover is slightly smaller than the sum of the bending dimension of the lead electrode of the heat-sensitive element and the outer diameter of the caulking terminal. A mounting device for a heat-sensitive element according to claim 1. (5) The thickness of the resin cover wall facing the heat-sensitive element is 1.
0:! -0.3 mm. (6) The resin cover has two cylindrical portions through which the stranded wires pass, with a pitch dimension approximately equal to the bending dimension of the extraction electrode of the heat-sensitive element, and a resin film is provided between the cylinders, and a through hole f: The heat-sensitive element mounting device according to claim 1, wherein the film thickness is smaller than the external dimension of the cylindrical part (7) The core wire exposed dimension of the stranded wire core wire and the heat-sensitive element The dimension beyond the bending position of the lead-out electrode is equal to or greater than the length dimension of the caulking terminal that simultaneously supports these two types of wire rods. Equipment for mounting heat-sensitive elements as described in Scope 1.