JPS6024003A - Contactless starting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a plug-in type or separate type non-contact starting device incorporating a t-characteristic heat-sensitive resistance element used for starting an electric compressor such as a refrigerator. In particular, it relates to electrode connection structures.

[Prior art]

A non-contact starting device incorporating a positive temperature sensitive resistance element, which is generally used to start an electric compressor such as a refrigerator, is installed in the outer shell 1a of the electric compressor 1 as shown in FIG. 1, depending on the purpose of use. input terminal 2 and socket terminal 3a of non-contact starting device 3
The plug-in type, which is used by directly connecting the
There are two types: a separately installed type in which a socket terminal 4a with a wire is connected to the socket terminal 4a, and a wire 4b of the socket terminal 4a with a wire is connected to a wire connecting terminal 5a of the non-contact starting device 5.

It is well known that the normal temperature resistance value, rated voltage, current, etc. of the PTC heat-sensitive resistance elements conventionally used in the plug-in type and the separate type differ depending on the usage conditions, and the shape and dimensions also change. However, as shown in FIG. 3, its internal structure consists of a PTC heat-sensitive resistance element 6 made of barium titanate-based ceramics, and both electrodes 6a and 6b coated with a conductive material such as silver paste to provide conductivity. The support frame 10 is attached to the casing 9 made of a heat-resistant insulating material by contacting the elastic bodies 7a, 8a of the conductive metal fittings 7, 8 made of a heat-resistant elastic material.
After storing the terminal portions 7b and 8 of the conductive metal fittings 7°8
b could be protruded to overturn the lid 11, and the housing 9 and the lid 11 were fixed using rivets 12 and 13.

Therefore, as shown in FIGS. 4 and 5, each time the thickness of the PTC heat-sensitive resistive element 6 changes, that is, one dimension, a large number of conductive metal fittings 7°8, which have complicated shapes and require dimensional accuracy, are required. It was. As a result, there has been a drawback that not only the cost of the mold increases, but also the cost of maintaining and managing the mold increases.

In addition, the cost of parts is high due to low-volume, high-mix production, and since the elastic bodies 7a, 13a of the conductive fittings 7, 8 and the terminal parts 7b, 8b are integrated, unnecessary terminal parts 7b, 8b are also made of expensive materials. This had the disadvantage of increasing the cost of parts.

Furthermore, since contact pressure cannot be generated on the elastic bodies 7a and 8a at the same time as assembly, the elastic body 7a has poor assembly efficiency.

8a or both electrodes 6 of the PTC heat-sensitive resistance element 6.
a, 6bK This had the disadvantage of causing scratches and reducing contact reliability. Furthermore, since the assembly method was blind assembly, it was difficult to confirm the contact state. As a result, some devices caused frequent contact failures and even stopped functioning as non-contact starting devices.

[Purpose of the invention]

An object of the present invention is to simply and inexpensively provide a non-contact starting device having an electrode connection structure with high contact reliability that can follow changes in the thickness dimension of a positive temperature resistance element.

[Summary of the invention]

That is, a conductive metal fitting in contact with both electrodes of a PTC heat-sensitive resistance element is divided into an elastic body and a terminal portion, and after the PTC heat-sensitive resistance element and the elastic body are housed in a housing, the conductive metal fitting is provided with a cut-out protrusion. This is intended to eliminate the above-mentioned drawbacks by press-fitting the elastic body between the elastic body and the casing, giving the elastic body deflection, and electrically connecting the PTC heat-sensitive resistance element, the elastic body, and the conductive metal fittings.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 6 and 7. Reference numeral 14 denotes a positive temperature resistance element housed in a housing 15 made of a heat-resistant insulating material via a support frame 16. Reference numeral 17 is an elastic body made of a conductive heat-resistant elastic material, and U-shaped bent portions 17 are provided at both ends of the elastic body 17, respectively.
a and 17b are provided and are brought into contact with one electrode 14a of the PTC heat-sensitive resistance element 14. Reference numeral 18 denotes an elastic body in which the KU-shaped bent portions 18a and 18b of the other electrode 14b are brought into contact. Reference numeral 19 denotes a conductive metal fitting having a cut-out protrusion 19a press-fitted between the body portion 17c of the elastic body 17 and the wall surface 15a of the housing 15. Reference numeral 2o denotes a conductive metal fitting in which a cut-out protrusion 20a is press-fitted between the body portion 18c of the elastic body 18 and the wall surface 15b of the housing 15. 21 is a conductive metal fitting 19 attached to the housing 15.
．． 20 terminal portions 19b, 20b are protruded from the lid.

22 and 23 are rivets for fixing the lid 21 to the housing 15.

The method of assembling the non-contact starting device having the above structure is as shown in FIG. Both electrodes 14a of the element 14.

14b and are housed with slight gaps δ■ and δ2 j7.

Next, the conductive metal fittings 19 and 20 are press-fitted between the elastic body 17 and the wall surface 15a of the housing 15, and between the elastic body 18 and the wall surface 15b of the housing 15.

By press-fitting the conductive metal fittings 19 and 20, the conductive metal fittings 19.2
The elastic bodies 17.18 move toward the electrodes 14a, 14b in accordance with the heights C and D of the cutout protrusions 19a and 20a, respectively, and when they come into contact with the electrodes 14a and 14b, the elastic bodies 17.18 U-shaped bent portions 17a, 17b and 18a
, 18b. This deflection generates contact pressure, and electrical connection between the conductive metal fitting 19, the elastic body 17, the positive temperature coefficient heat sensitive resistance element 14, the elastic body 18, and the conductive metal fitting 20 is established.

As described above, the present invention provides an elastic body 17 according to the heights C and D of the cutout protrusions 19a and 20a of the conductive metal fittings 19 and 20.
．． Since the structure is such that the PTC heat-sensitive resistance element 14 is deflected, if the thickness of the PTC heat-sensitive resistance element 14 changes, the heights C and D of the cut-out convex portions 19a and 20a may be changed.
The elastic bodies 17 and 18 can be used in common.

Therefore, the elastic bodies 17 and 18, which require high dimensional accuracy and are made of expensive materials, can reduce mold costs, improve production efficiency through mass production, and reduce manufacturing costs by improving material removal. significantly reduced. Further, the conductive metal fittings 19 and 20 have the same external dimensions, and a cutout convex portion 19a,
Since it can be formed by changing the height C10 dimension of 20a, the outline cutting mold can be shared, and a simple mold can be used to change the height C and D dimensions of the cutting protrusions 19a and 20a to be formed in the later process. You can prepare as necessary. As a result, the process up to the middle of the process is standardized, and maintenance costs can be reduced, such as by shortening the setup time such as mold adjustment.

Furthermore, since it can be formed without using an expensive conductive heat-resistant elastic material, the parts can be provided at low cost.

Furthermore, since the necessary contact pressure is obtained by the heights C and D of the cut-out convex portions 19a and 20a of the conductive metal fitting 19.2''0, assembly of the PTC heat-sensitive resistance element 14 and the elastic body 17.18 is easy. Also, neither deformation of the elastic body 17 and 18 nor damage to both electrodes 14a and 14b of the PTC heat-sensitive resistance element 14 occurs.

As a result, there is an effect that a non-contact activation amount with high contact reliability can be obtained.

FIG. 9 shows a terminal portion 19b of a conductive metal fitting 19, 20 for making the non-contact starting device of the present invention into a plug-in type.

20b has the shape of socket terminals 19b' and 20b', and plug-in terminals 19d and 20d are provided on the opposite side of the socket terminals 19b' and 20b', and the plug-in terminal 1
This shows another application example in which 9d and 20d protrude from the bottom surface 15C of the housing 15.

Similarly, the present invention is directed to the cutting protrusion 19a of the conductive metal fitting 19.20.
, 20a are in contact with the body parts 17c, 18c of the elastic body 17.18.
Exactly the same effect can be obtained even if it is brought into contact with 5a' and 4jb, and it is not affected in any way by its directionality.

〔Effect of the invention〕

According to the present invention, there is no need to replace the entire conductive fitting having an elastic body and a terminal portion in response to a change in the thickness dimension of a PTC heat-sensitive resistance element as in conventional non-contact starting devices. Since the body was separated, only the conductive metal fittings with terminals needed to be replaced.

Therefore, the elastic body can be used in common for positive characteristic heat-sensitive resistance elements of any size, and assembly during assembly can be standardized, so that a non-contact starting device with high contact reliability can be provided simply and at low cost.

Moreover, it can be applied regardless of the difference in shape between plug-in type and separately installed type, and has great practical effects.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the mounting configuration of a conventional plug-in type non-contact starting device, Fig. 2 is an exploded perspective view showing the mounting structure of a conventional separately installed non-contact starting device, and Fig. 3 is the same as Fig. 1. 4 and 5 are explanatory views of the main parts of FIG. 3, FIG. 6 is a cross-sectional front view of the non-contact starting device of the present invention, and FIG. FIG. 6 is an exploded perspective view, FIG. 8 is an explanatory assembly view of FIG. 6, and FIG. 9 is a sectional front view showing another embodiment of the present invention. 14...Positive characteristic heat sensitive resistance element, 14a, 14b...
Electrode, 15--Housing, 15a, 15b, Wall surface, 1
6... Support frame, 17... Elastic body, 18... Elastic body, 19... Conductive metal fitting, 19a... Cutout convex portion, 1
9b...Terminal part, 20...Conductive metal fitting, 20a...
Cutting convex portion, 20b...terminal portion, 21...lid. ? -3 figures $5 eyes $7 figures be-

Claims (1)

[Claims] 1. One electrode (14 a
) side and the elastic body (18) to the other electrode (14b) side. After that, a conductive metal fitting ( 19) and the elastic body (18) and the wall surface (15) of the housing (15).
b) A conductive metal fitting (20) is press-fitted between the terminal parts (19b, 20b) of the conductive metal fittings (19, 20).
In the non-contact starting device that protrudes from the lid (21), the conductive metal fittings (19, 20) are provided with cut-out protrusions (19a,
20a) to apply a large displacement to the elastic bodies (17, 18). 2. Connect the cutout protrusions (19a, 20a) with the elastic body (17
, 18), the non-contact starting device according to claim 1, which is provided on the contact surface side of the device. 3. Attach the cutout protrusions (19a, 20a) to the casing (15)
The non-contact starting device according to claim 1, which is provided on the contact surface side of the wall surface (15a, 15b) of the device.