JPH0219923Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a positive temperature coefficient thermistor device used in a starting device for an electric compressor used in a refrigerator or the like.

Conventional Structure and Problems The conventional structure is explained with reference to FIGS. 1 and 2. The outer shell 1 of an electric compressor usually has a main winding terminal 2a (hereinafter referred to as "M terminal"). Auxiliary winding terminal 2b (hereinafter referred to as "A terminal") and common terminal 2c
Three input terminals (hereinafter referred to as "C terminals") are provided. Of these, a socket terminal (not shown) for connecting an overload relay is press-fitted to the C terminal 2c, and socket terminals 4 and 5 of a positive temperature coefficient thermistor device 3 are inserted and fitted to the M terminal 2a and A terminal 2b. has been done. The socket terminals 4 and 5 are fixed to an electrode plate holding a positive temperature coefficient thermistor element (not shown), and are housed in a case 6 made of a heat-resistant insulating material. 7 forms a box with case 6,
This is a cover having input terminal insertion holes 7a and 7b.

In this structure, the holes 7a and 7b for insertion into the input terminals of the positive temperature coefficient thermistor device 3 need to have a hole diameter slightly larger than the diameter of each terminal because the distance between the M terminal 2a and the A terminal 2b varies. A gap 7c is created, and as a result, foreign matter such as refrigerant, refrigeration oil, welding flux, etc. is transmitted from the electric compressor side to the input terminals 2a and 2b, and the positive temperature coefficient thermistor device 3
If the inside of the PTC thermistor device is penetrated into the PTC thermistor element, it will not only lead to destruction of the PTC thermistor element and greatly reduce the reliability of the PTC thermistor device 3, but also damage the outer casing composed of the case 6 and the cover 7. Since the hermeticity is impaired, the power consumption as a positive temperature coefficient thermistor device increases.

Purpose of the invention The purpose of the invention is to seal the gap in order to obtain a positive temperature coefficient thermistor device with high reliability and low power consumption.

Structure of the invention To achieve this purpose, a seat and a cover are made of a heat-resistant elastic sheet material formed in a case, with holes slightly smaller than the diameter of each input terminal corresponding to the holes for inserting input terminals in the cover. When a positive temperature coefficient thermistor device is attached to an electric compressor with compression maintained by
The inside is completely sealed.

DESCRIPTION OF EMBODIMENTS The details of the present invention will be explained below with reference to an embodiment shown in FIGS. 3 to 5. In the drawings, parts that are the same as those in the conventional example are given the same reference numbers and explanations are omitted, and only the different parts will be explained. The difference from the conventional case is that the heat-resistant elastic material has holes 9a and 9b that are slightly smaller in diameter than the two input terminals 2a (M terminal) and 2b (A terminal) of the electric compressor between the cover 7 and the case 8. The point is that the sheet material 9 (hereinafter simply referred to as sheet material) is fixedly charged. That is, a seat 8a having a width equivalent to the sheet material 9 and slightly shallower is provided at the opening of the case 8, and the sheet material 9 is placed on the seat 8a, and the cover 7 is closed.
is fitted into the case 8, and the sheet material 9 is slightly compressed and fixed.

With this structure, the positive temperature coefficient thermistor device 10
When attached to the input terminals 2a, 2b of the electric compressor outer shell 1, as shown in FIG. Since the sheet material 9 is fixed by slightly compressing its thickness, a force that constantly reduces the diameter of the holes 9a and 9b is applied, and as a result, the input terminal mounting part of the electric compressor cannot be sealed for a long time. It is possible to prevent leakage of refrigerant and refrigeration oil and foreign matter (such as welding flux) from entering the positive temperature coefficient thermistor device 10 through the input terminals 2a and 2b. In addition to preventing destruction of the characteristic thermistor element,
The hermeticity of the outer box constituted by the case 8 and the cover 7 is improved, the amount of heat leaked to the outside is reduced, and the power consumption of the positive temperature coefficient thermistor device can be kept low.

Effects of the Invention As is clear from the above explanation, the present invention includes a case that houses a positive temperature coefficient thermistor element and a terminal, and a cover that closes this case, and the input terminal is inserted into the input terminal insertion hole formed in the cover. A heat-resistant elastic sheet member having a hole slightly smaller than the diameter is housed, a seat portion shallower than the thickness of this sheet member is formed in the case, and the case and cover are attached via the elasticity of this sheet member, The degree of sealing of the PTC thermistor device consisting of the cover and case increases, and as a result, foreign matter such as refrigerant, refrigeration oil, flux, etc. enters the PTC thermistor device through the input terminal of the electric compressor and adheres to the PTC thermistor element. This makes it possible to prevent damage to the PTC thermistor device, reduce power consumption as a PTC thermistor device, and use a heat-resistant sheet member with elasticity that is separate from the highly rigid cover that constitutes the outer case. Since it is compressed and attached, it has the effect of constantly reducing the hole diameter, and has the effect of maintaining close contact between the sheet member and the input terminal over a long period of time.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the mounting surface of a conventional positive temperature coefficient thermistor device on an electric compressor, Fig. 2 is a side view showing the installation state of the same device, and Fig. 3 is a positive temperature coefficient thermistor device showing an embodiment of the present invention. FIG. 4 is a plan view showing the electric compressor mounting surface of the apparatus, FIG. 4 is a side view showing the installed state of the apparatus, and FIG. 5 is a sectional view of the main part taken along line -' in FIG. 1... Outer shell (compressor), 2a, 2b, 2c...
Input terminal, 4, 5... socket terminal, 7... cover, 8... case, 9... heat resistant elastic sheet member, 9a... hole, 8a... seat.

Claims (1)

[Scope of utility model registration request] a positive temperature coefficient thermistor element, an electrode plate holding the positive temperature coefficient thermistor element, a terminal having a socket member for direct connection to an input terminal of an electric compressor, a case housing the positive temperature coefficient thermistor element and the terminal; a cover for closing the case, housing a heat-resistant elastic sheet member having a hole slightly smaller in diameter than the input terminal corresponding to the input terminal insertion hole provided in the cover, and the sheet member in the case; A positive temperature coefficient thermistor device with a shallower seat.