JPH0654748B2 - Capacitor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a capacitor to which a PTC thermistor can be attached.

2. Description of the Related Art In compressors used in conventional refrigerators, electric circuits are configured by combining various capacitors for motor starting and running and PTC. In FIG. 3, 1a is a running capacitor, 10a is a PTC, 12 is a main winding, 1
3 is an auxiliary winding, and when the power is turned on, the auxiliary winding 13
A large current flows to improve the start-up characteristics of the motor, and after a while, the PTC 10a has a large resistance value due to self-heating, and a small current flows to the auxiliary winding 13 through the running capacitor 1a. And X,
Points Y and Z are provided as hermetic terminals of the compressor. In the circuit as shown in Fig.3, which is a combination of running capacitor and PTC, the case surface temperature is 6 when energized.
The PTC, which can reach 0 to 110 ° C, was attached to the hermetic terminal of the compressor, the capacitor was placed in the control box away from the compressor, and they were connected by the lead wire with the terminal.

As a capacitor, a dry type SMF capacitor which is flame-retardant and has a safety function is often used recently.

As a film, polyethylene terephthalate (hereinafter P
ET) and polypropylene (hereinafter abbreviated as PP) are used.

The PTC is a housing in which a PTC element and an electrode are housed, and there are various shapes such as a method for taking out the electrode.

Problems to be Solved by the Invention When a PTC is attached to a capacitor, the capacitor is PTC
It is easily deteriorated by the heat from. Therefore, there are the following problems.

First, since the capacitor and the PTC must be placed separately, it takes man-hours for each connection.

In addition, an insulating cover is required for the connection part, and space is required for fixing the capacitor.

Therefore, an object of the present invention is to prevent deterioration of the capacitor due to heat from the PTC.

Means for Solving the Problems The present invention relates to a capacitor in which a laminated metal film capacitor element is housed in a capacitor case such that the film surface of the laminated metallized film capacitor element faces the synthetic resin injection surface of the capacitor case. In addition, the positive temperature characteristic thermistor can be attached by the lead terminal extending from the synthetic resin injection surface to the outside of the capacitor case.

Function The present invention is configured to transfer heat from the PTC, which is a high temperature object by the above means, gradually from the outer film surface of the capacitor element to the inner laminated film portion, and the influence of the heat from the PTC is the film of the outer layer. Please receive sequentially from. As a result, even if the outer layer is thermally deteriorated, the function as a capacitor can be sufficiently exerted in the remaining laminated portion by the self-healing and security functions.

EXAMPLE In FIG. 1, 1 shows a capacitor of the present invention, 2 shows S
The MF capacitor element is a PET or PP film on which aluminum or zinc is vapor-deposited as an electrode, and 3 is a laminated film surface of the capacitor element 2 . Usually, the outermost layer on the film surface is wound with a PET or PP insulating film as a protection. 4 is a metallikon part, 5 is a laminated part,
6 is a lead terminal, 7 is a resin capacitor case,
The SMF capacitor element 2 is put into the capacitor case 7 so that the film surface 3 faces in the direction in which the lead terminals 6 are taken out, and a resin such as epoxy is injected from the resin injection surface 8 and thermally cured to obtain the dry SMF capacitor 1 . . 9 is PTC
10 is a PTC element, and 11 is a hermetic terminal receiver. Receiving the lead terminal 6 (not shown) is the PTC
9 is provided so that the PTC 9 can be attached to the capacitor 1 above the resin injection surface 8 of the capacitor.
Furthermore, the PTC 9 is the hermetic terminal 11 of the compressor.
The PTC and the condenser can be attached to the compressor to be integrated. With such a structure, the temperature distribution is as in the case of FIG. 2a, and there is no great difference from the temperature distribution in the stacking plane direction to the maximum temperature of the capacitor of FIG. 2c alone. However, in a structure in which the lamination surface is on the PTC side, the heat from the PTC has the same effect in the lamination direction, the highest temperature portion becomes higher, and thermal deterioration is large and occurs in the entire film layer. a is 5 in a and b
-20 ° C temperature advantage.

The point A on the film surface 3 in FIG. 1 is 50 to 80 ° C., and the point B on the laminated surface 5 is 40 to 60 ° C. When the film surface is brought to the PTC side, even PET or PP film has a sufficient life. You can expect to have it.

In addition, a thermal design can be easily performed by providing a gap between the capacitor and the PTC to increase heat insulation from the PTC, or increasing the heat dissipation by increasing the resin layer above the film surface on the PTC side. .

Further, if the lead terminal is exposed from the resin injection surface, the lead terminal is short and the case is easily processed.

EFFECTS OF THE INVENTION Since PTC, which is a high-temperature object, can be attached to a capacitor and further it can be attached to a compressor, the shape can be made small and the installation space can be saved. Also, since the lead terminals can be connected, the number of connecting steps is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a capacitor according to an embodiment of the present invention,
FIG. 2 is an explanatory view showing the temperature distribution of the capacitor, and FIG. 3 is a circuit diagram of a conventional capacitor. 1 ... Capacitor of the present invention, 2 ... Capacitor element, 3
...... Film surface, 5 ...... Laminate surface, 6 ...... Lead terminal, 7
...... Capacitor case, 8 …… Resin injection surface, 9 …… PT
C, 10 ... PTC element.

Claims (1)

[Claims] 1. A capacitor having a laminated metallized film capacitor element housed in a capacitor case, wherein the laminated metallized film capacitor element is housed so that the film surface of the laminated metallized film capacitor element faces the synthetic resin injection surface of the capacitor case. Capacitors with a positive temperature coefficient thermistor that can be mounted with lead terminals extending from the resin injection surface to the outside of the capacitor case.