JP2589021Y2 - Temperature-sensitive reed switch and temperature-sensitive reed switch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature-sensitive reed switch and a temperature-sensitive reed switch device in which a temperature-sensitive reed switch is positioned and accommodated in a case.

[0002]

2. Description of the Related Art As a conventional temperature-sensitive reed switch device,
By positioning the conductive terminal in the case, the temperature-sensitive reed switch is positioned and housed in the case,
There is a thermosensitive reed switch in which a lead portion is connected and fixed to a conductive terminal.

As shown in FIG. 6, a temperature-sensitive reed switch 1 applied to this device includes a temperature-sensitive magnetic material 2, permanent magnets 3, 3 and a reed switch 4 such that a magnetic circuit is formed. It is composed of

Further, the temperature-sensitive magnetic body 2, the permanent magnets 3, 3 and the reed switch 4 are joined together from a low temperature range to a high temperature range so that the switch 1 can sufficiently exhibit its function as a temperature control element. Usable one-part or two-part silicone rubber (hardness JIS-A 20 to 40) 5 was used.

On the other hand, as shown in FIG. 7, a reed switch 4 applied to the temperature-sensitive reed switch 1 has a pair of reeds 41 and 41 so that a contact gap 41a is formed in the center of a glass tube 40. One end of 41 is overlapped,
Each lead wire 41, 4 is sealed with a glass tube 40.
The lead portion 41b on the other end side of 1 protrudes out of the glass tube 40. Most of the reed pieces 41, 41 of the reed switch 4 have a target shape for automatic assembly, and are arranged so that a contact gap 41a is formed at the center in the glass tube 40. Due to the structure, as shown in FIG. 7, an axis shift e has occurred.

Further, since there is a slight gap between the inner diameter of the permanent magnets 3, 3 and the outer diameter of the reed switch 4, there is a case where the inclination θ is generated as shown in FIG.

[0007]

As described above, in the conventional temperature-sensitive reed switch device, the reed switch 4 has an axial displacement e and an inclination .theta., And the temperature-sensitive magnetic substance 2 and the permanent magnet 3 are connected to the lead. Since the switch 4 was joined with the silicon rubber 5 having high hardness and poor flexibility, the following problems occurred.

(1) In the temperature-sensitive reed switch device, the lead 41b of the temperature-sensitive reed switch 1 is connected and fixed to the conductive terminal by spot welding or the like.
Bending stress was generated in the lead portion 41b by this welding, and the strain caused by the generated bending stress could not be completely absorbed by the conventional silicon rubber 5, and cracks occurred in the sealing portion of the glass tube 40.

(2) When an impact force is applied to the temperature-sensitive reed switch device, the impact force cannot be completely absorbed by the conventional silicon rubber 5, causing a characteristic change or a change in the contact gap 41a to increase, thereby turning the temperature ON. A functional failure of not performing the / OFF operation has occurred. For example, when dropped on a concrete floor, if the drop height exceeds 50 cm, a functional failure occurs.

(3) The temperature-sensitive reed switch device is operated at 200 ° C.
When used at a high temperature exceeding the above, the conventional silicone rubber 5 has a large coefficient of thermal expansion as compared with other resins such as epoxy, and has poor flexibility. The strain caused by the difference in thermal expansion coefficient could not be absorbed, and cracks occurred at the center of the glass tube 40 (near the contact portion). The reason why the glass tube 40 is broken is that the reed switch 4 melts and seals the central portion of the glass tube 40 by heat, so that residual strain remains in each part of the glass tube 40.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a temperature-sensitive reed switch and a temperature-sensitive reed switch device having improved heat resistance and reliability.

[0012]

Means for Solving the Problems To achieve the above object, the present invention provides a temperature-sensitive reed switch in which a magnetic circuit is formed from elements of a temperature-sensitive magnetic material, a permanent magnet, and a reed switch. Each of the elements is joined by a gel-like silicon adhesive.

According to a second aspect of the present invention, there is provided a temperature-sensitive reed switch in which a magnetic circuit is formed from elements of a temperature-sensitive magnetic material, a permanent magnet, and a reed switch, and a case for positioning and housing the temperature-sensitive reed switch. Wherein the respective elements of the temperature-sensitive reed switch are joined with a gel-like silicone adhesive.

[0014]

According to the first aspect of the present invention, even when a force is applied between the elements of the temperature-sensitive reed switch during assembling or use, the gel-like silicone adhesive absorbs the force, and the temperature-sensitive reed switch receives the force. To prevent damage.

According to the second aspect of the present invention, even when a force is applied between the elements of the temperature-sensitive reed switch when the temperature-sensitive reed switch is positioned and accommodated in the case during assembly or use, or the like, the gel-like reed switch is formed. Silicone adhesive absorbs it and prevents breakage of the temperature sensitive reed switch.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of the temperature-sensitive reed switch 10 of the present invention.

The temperature-sensitive reed switch 10 comprises, for example, cylindrical permanent magnets 3 having inner and outer diameters substantially equal to those of the cylindrical temperature-sensitive magnetic body 2 on both sides of the cylindrical temperature-sensitive magnetic body 2. Insert the reed switch 4 inside the body 2 and the permanent magnet 3,
It is joined by a gel-like silicon adhesive 50.

According to the temperature-sensitive reed switch 10 of the present embodiment thus constructed, as shown in FIG. 2, the reed switch 4 is inclined and joined to the temperature-sensitive magnetic body 2 and the permanent magnet 3. Even when a bending force is applied to the lead portion 41b when positioning the temperature-sensitive reed switch 10 or the like, the position of the reed switch 4 is corrected in the direction indicated by the arrow in FIG. Since the bending force is absorbed, the sealing portion of the glass tube 40 is protected, and cracks can be prevented.

FIG. 3 shows a temperature-sensitive reed switch device 1 according to the present invention.
FIG. 4 is a perspective view showing one embodiment of FIG.
Is an exploded perspective view thereof.

The temperature-sensitive reed switch device 100 shown in FIG.
Temperature-sensitive reed switch 10 constructed in the same manner as shown in FIG.
And a conductive terminal 11 connected to the lead portion 41b of the switch 10, a mounting bracket 12 for mounting the device 100, a case 13 for accommodating the temperature-sensitive reed switch 10, a lid 13 ', and the like. I have. In addition,
The lid 13 'is shown in phantom lines in FIG. 3 for convenience.

The conductive terminal 11 is made of a conductive metal such as brass, and has a case 13 on the lower side.
A protruding portion 110 inserted into an elongated hole 130 (see FIG. 4) described later, and a contact piece 1 bent at an upper end into an inverted L-shape.
11 are provided. The lead portion 41b of the temperature-sensitive reed switch 10 is joined to the back surface 111a of the contact piece 111 by spot welding or the like.

The mounting bracket 12 comprises a substantially plate-shaped mounting portion 121 having a mounting hole 120 formed therein, and a curved portion 122 extending from the mounting portion 121 with a step. The R portion of the curved portion 122 has a shape corresponding to the outer diameter of the temperature-sensitive magnetic body 2 and the permanent magnet 3 of the temperature-sensitive reed switch 10, and encloses the temperature-sensitive magnetic body 2 and the permanent magnet 3. Thus, the heat conductive grease is applied so that the mounting portion 121 projects to the side surface corresponding to the mounting bracket receiving portion 136 of the case 13 described later.

The case 13 has a recess 131 for accommodating the temperature-sensitive magnetic body 2 and the permanent magnet 3 of the temperature-sensitive reed switch 10 on the center upper surface side. An accommodation groove 132 for accommodating both ends of the glass tube 40 of the switch 10 is provided, and a lead groove 133 for inserting the lead 41b of the temperature-sensitive reed switch 10 is provided outside the accommodation groove 132. Therefore, the temperature-sensitive reed switch 10 is completely accommodated in the accommodating recess 131, the accommodating groove 132, and the lead groove 133 including the lead portion 41b.

Further, outside the lead groove 133,
Terminal accommodating section 13 accommodating conductive terminal 11
4 are formed. In a state where the contact piece 111 of the conductive terminal 11 and the lead part 41b of the temperature-sensitive reed switch 10 are connected by the terminal accommodating part 134, the contact piece 111 and the lead part 41b are received from below, and The position can be fixed. On the lower surface side of the case 13, an elongated hole 130 and an insertion hole 135 are provided. The long hole 130 is a through hole for projecting the projecting portion 110 of the conductive terminal 11, and penetrates to the step portion 134. The insertion hole 135 is a through hole for inserting an electrode of a spot welding machine or the like.
34 is penetrated. Further, in the side surface direction of the case 13, a mounting bracket receiving portion 136 having a shape corresponding to the mounting portion 121 of the mounting bracket 12 is protruded, and a mounting hole 137 similar to the mounting hole 120 of the mounting portion 121 is provided.

According to the temperature-sensitive reed switch device 100 of the present embodiment configured as described above, when the conventional silicon rubber 5 is used when the lead portion 41b and the conductive terminal 11 are spot-welded. Although cracks, chipping, chipping and the like of the glass tube sealing portion have occurred by 2 to 3%, the occurrence of cracks and the like can be completely eliminated. In addition, it becomes strong against drop impact,
Reed switch 1 even when exposed to high temperatures exceeding 00 ° C
Thus, a stress that is sufficient to break the glass tube 40 of 0 is not applied, so that it is possible to provide the temperature-sensitive reed switch 10 and the temperature-sensitive reed switch device 100 having high heat resistance and high reliability.

The present invention is not limited to the above embodiment,
Various modifications can be made without departing from the scope of the invention.
For example, components to be joined by a flexible silicone adhesive may be selected as needed.

[0028]

According to the first aspect of the present invention, since the elements forming the magnetic circuit are joined by the gel-like silicon adhesive, the temperature-sensitive lead is used during assembly or use. Even if a force is applied between the elements of the switch, it can be absorbed by the gel silicon adhesive, so that normal operation can be performed without breaking the glass tube, and a temperature-sensitive lead with improved heat resistance and reliability. A switch can be provided.

According to the second aspect of the present invention, since the respective elements forming the magnetic circuit are joined by the gel-like silicone adhesive, the assembling or use or the temperature-sensitive reed switch is positioned and accommodated in the case. In this case, even if a force is applied between the elements of the temperature-sensitive reed switch, it can be absorbed by the gel silicon adhesive, so that normal operation can be performed without breaking the glass tube, and heat resistance and reliability can be improved. An improved temperature-sensitive reed switch device can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a temperature-sensitive reed switch of the present invention.

FIG. 2 is a sectional view showing the operation of the embodiment of the temperature-sensitive reed switch of the present invention.

FIG. 3 is a perspective view showing an embodiment of the thermosensitive reed switch device of the present invention.

FIG. 4 is a bottom view showing an embodiment of the thermosensitive reed switch device of the present invention.

FIG. 5 is an exploded perspective view showing an embodiment of the thermosensitive reed switch device of the present invention.

FIG. 6 is a cross-sectional view of a conventional temperature-sensitive reed switch.

FIG. 7 is a sectional view of a reed switch.

[Explanation of symbols]

 2 Temperature Sensitive Magnetic Body 3 Permanent Magnet 4 Reed Switch 10 Temperature Sensitive Reed Switch 13 Case 50 Gel Silicon Adhesive 100 Temperature Sensitive Reed Switch Device

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C09J 183/00-183/16 H01H 11/00-11/06 H01H 37/58-37/74

Claims (2)

(57) [Scope of request for utility model registration] 1. A temperature-sensitive reed switch in which a magnetic circuit is formed from elements of a temperature-sensitive magnetic material, a permanent magnet, and a reed switch, wherein said elements are joined with a gel silicon adhesive. Hot reed switch. 2. A temperature-sensitive reed switch having a temperature-sensitive reed switch in which a magnetic circuit is formed from elements of a temperature-sensitive magnetic material, a permanent magnet, and a reed switch, and a case for positioning and housing the temperature-sensitive reed switch. A temperature-sensitive reed switch device, wherein the respective elements of the temperature-sensitive reed switch are joined with a gel-like silicone adhesive.