JPS63220745A - Motor starter and overload protector - Google Patents

Abstract

PURPOSE:To contrive to miniaturize an apparatus and reduce its cost, and improve its fitting workability, by incorporating a starter and an overload protector in an integral case in a compressor outer shell. CONSTITUTION:A starter 22 and an overload protector 23 are incorporated in an integral case 21 in a compressor outer shell. Pin receiver terminals 29, 30 of said starter 22 are connected with a common connection of main and auxiliary windings of a compressor. A thermostat element sensing a motor outer shell temperature is provided in the vicinity of the compressor outer shell. The starter 22 and the overload protector 23 are partitioned by a wall 24. The overload protector 23 has a fixed contact 37 and a protective terminal 38.

Description

[Detailed description of the invention] Industrial applications The present invention relates to motor starting and overload protection devices.

BACKGROUND OF THE INVENTION Various motor starting and overload protection devices have been proposed in the past. In particular, starting devices and overload protection devices used in compressors used in refrigerators, etc. have become cheaper in recent years.
There is a need to improve installation work efficiency. For this reason, attempts have been made to accommodate the starter device and overload protection device, which were conventionally separate devices, in one package to meet the above requirements. For example, Japanese Patent Application Publication No. Sho BB-47976
It is either a combination of conventional products, its shape is large, and the cost cannot be reduced sufficiently. Therefore, it has been proposed to reduce the size of the overload protection device and integrate it with the starting device. For example, U, S PAT, RE 3136” Saitama is the 5th
Show the button. 1 is a starting device, and 2 is an overload protection device. The starting device 1 is composed of a ceramic element with well-known PTC characteristics, the pin receiving terminal 3 is connected to the main winding of the compressor, and the pin receiving terminal 4 is connected to the auxiliary winding. Connected. In addition, overload protection device 2
is installed on the starting device 1, and the pin receiving terminal 6 is connected to the common connection part of the main winding and the auxiliary winding. The overload protection device operates by snap action of a bimetallic plate.

This device uses a split-phase startup method as shown in FIG. In the figure, C indicates a common terminal, M indicates a main winding, and S indicates an auxiliary winding. 6 is an overload protection device, 7 is a PTC ceramic element, and CR is a running capacitor.

Problems to be Solved by the Invention In the above example, the compressor startup and overload protection devices are integrated and miniaturized, reducing costs and improving installation workability. However, the location of the overload protection device is There was a problem that if the compressor was moved away from the outer shell of the compressor, the temperature followability of the compressor outer shell would deteriorate. The present invention solves the above problems and provides an integrated starting/overload protection device for a compressor that is compact, low cost, and easy to install. Our aim is to provide something that has improved.

Means for Solving the Problems In order to solve the above problems, the present invention provides a starting device and an overload protection device integrated into the compressor outer shell, a main winding of the compressor, It has a configuration in which a pin receiving terminal connected to the common connection part of the auxiliary winding and a thermostat element that senses the motor outer shell temperature are installed near and parallel to the compressor outer shell.

For this reason, the thermostat element is located near the compressor outer shell to the same extent as the pin receiving terminal, and can sensitively sense temperature changes in the compressor outer shell.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4. Although the starting method of this embodiment is the split-phase starting method shown in FIG. 6, other methods can also have the same effect. 21
is a substantially rectangular case, and the starting device section 22 has a semi-cylindrical bulge 22a, and a wall 24 separating the starting device 22 and the overload protection device 23. In addition, the starting device section 22 has two
One square hole (25a, 2
5b.

25C), which is the protrusion 2 of the cover 26.
It mates with 7. The cover 26 has a flat plate shape and has three circular holes 28 through which pin terminals (not shown) electrically connected to a compressor (not shown) are passed.

The starting device section 22 includes a pin receiving terminal 29 formed in a substantially oval shape that connects to a pin terminal (not shown) connected to a main winding of a compressor (not shown), and an auxiliary winding. There is a pin receiving terminal 30 that is connected to a pin terminal (not shown).

The pin receiver terminals 29, 30 are positioned by the guides of the case 21 and placed in a position to mate with a pin terminal (not shown). Pin receiving terminal 29.30
Each is connected to a power plate 31 having a pair of V-shaped elastic legs made of a spring material with poor thermal conductivity. Further, terminals 32 each having a terminal portion are connected to the bottle receiving terminals 29 and 30, respectively. A ceramic 33 having PTC characteristics (hereinafter referred to as ceramic) is held by the elastic legs of the two elastic plates 310,
It is housed in a semi-cylindrical protrusion 21a of the case 21.

The ceramic 33 is disk-shaped, and its surface is plated with silver. A semicircular spacer 34 made of mica or the like is provided to prevent direct contact between the case 21 and the ceramic 33. Further, a linear spacer 36 made of mica or the like is provided to press the ceramic 33 on the cover 26.

The overload protection device section 23 is constructed of a concave base 36 made of insulating resin and having protrusions 3ea and b at both ends thereof. There is a fixative liquid egg 7 and a holding terminal 38 fixed to the holder. Possible fixing methods include adhesion and insert molding.

Here, the fixed contact 37 includes a fixed part 37a to the base 36, and a contact part 37b parallel to the fixed part 37a, having a silver 2-rad contact on one side, and having a slit in the connecting part with the fixed part 37a. It has a pin receiving terminal portion 37a bent perpendicularly to the fixed portion 37a.

Further, the holding terminal 38 has a first protrusion 38a and a second protrusion ssb when bent in an L-shape opposite to the pin receiving terminal portion 370 of the fixed contact 37.

The first protrusion 38a has an angular shape and has a contact 3e at its tip that comes into contact with and separates from the contact portion 37b of the fixed contact 37.
A thermostat element 4o molded from bimetal or trimetal that opens and closes is welded.

The pin receiving terminal portion 37c of the fixed contact 37 has a pin having a substantially elliptical pin receiving portion 41a that connects to a pin terminal (not shown) connected to a common connection portion between the main winding and the auxiliary winding. The receiving terminal 41 is welded.

Further, an auxiliary heater 42 made of bent nichrome wire or the like is welded to the second protrusion sab of the holding terminal 38, and the auxiliary heater 42 is further connected to a terminal 43 for external connection. The terminal 43 exits from the case 21 through a square hole. Here, the auxiliary heater 42 is not necessarily required, and when it is not necessary, the holding terminal 38 and the terminal 43 are connected with a low resistance wire such as a copper wire. With the above configuration, it can be seen that the pin receiving terminal 41 and the auxiliary heater 42 are arranged so as to sandwich the thermostat element 39.

Furthermore, the overload protection device section 23 incorporated in the base 36 is detachably attached to the case 21, and after attachment, the overload protection device section 23 is attached to the case 21.
It is sealed at 6.

The operation will now be explained.

When the compressor (not shown) is started, the ceramic 33 is cold and has low resistance, and current flows through the main winding and auxiliary winding of the compressor (not shown), providing sufficient starting torque. When the compressor (not shown) starts, the resistance of the ceramic 33 suddenly increases due to self-heating, and the current flowing to the auxiliary winding becomes sufficiently small.

In the overload protection device 23, the thermostat element 39 is normally closed, but when the motor is locked or overloaded, the overload protection device 23 detects the current flowing through the overload protection device and the compressor (not shown) ) is detected and the circuit is opened. Further, the thermostat element 39 is processed to have a certain set temperature, but the temperature can be further adjusted by varying the position of the contact portion 37b of the fixed contact 37 as a means for finely adjusting the temperature.

As described above, by incorporating the starting device 22 and the overload protection device 23 into the integrated case 21, it is possible to provide a small and low-cost motor starting/overload protection device, and also It can also be easily installed.

Furthermore, the overload protection device 23 is configured such that the pin receiving terminal 41 and the auxiliary heater 42 are arranged parallel to and near the outer shell of the compressor so as to sandwich the thermostat element 39. It can sensitively follow temperature changes.

Effects of the Invention As described above, the present invention houses a motor starting/overload protection device in an integrated case, and connects the motor outer shell to three pin terminals connected to the motor windings. Furthermore, the overload protection device includes a bottle receiving terminal connected to a common connection between the main winding and the auxiliary winding of the motor, a fixed contact portion electrically connected to the bottle receiving terminal, and the fixed contact portion. It consists of a holding plate that holds a thermostat element that opens and closes its contacts at a set temperature, and a terminal that is electrically connected to the holding plate and connected to the outside. Since the thermostat element is configured to be parallel to the motor outer surface, (1) the motor starting and overload protection devices are downsized and housed in an integrated case, making it possible to operate the motor at low cost. ＠) The thermostat element of the overload protection device is placed parallel to the bottle holder terminal and the outer surface of the motor and close to the outer shell, so it quickly follows temperature changes on the outer shell of the motor. Burnout of the motor can be prevented.

As described above, the present invention is extremely useful in practice.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a startup/overload protection device according to an embodiment of the present invention, Fig. 2 is a front view with the cover of Fig. 1 removed, and Fig. 3 is a central sectional view of an embodiment of the present invention. , 4th
The figure is an exploded perspective view of the overload protection device in Figure 1, and Figure 5.
The figure is a perspective view of a conventional example, and FIG. 6 is an electric circuit diagram of a split-phase starting method. 21... Case, 22... Starting device,
23... Overload protection device, 36... Base, 37... Fixed contact section, 38...
Holding terminal, 39...Contact, 4°...Thermostat element, 41...Bottle receiving terminal, 42...Auxiliary heater, 43... ·Terminal. Name of agent Patent attorney Toshi Nakao 11 or 1 person 2
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Claims (2)

[Claims] (1) A first pin terminal connected to the main winding of the motor, a second pin terminal connected to the auxiliary winding, and a common connection between the main winding and the auxiliary winding on the outer shell of the motor. the first and second pin terminals are connected to a motor starting device, the third pin terminal is connected to a motor overload protection device, and the third pin terminal is connected to a motor starting device; and the overload protection device are housed in an integrated case on the same plane, and the starting device and the overload protection device are separated by a wall inside the case, and the overload protection device is connected to a third pin terminal. a pin receiving terminal, a fixed contact portion electrically connected to the pin receiving terminal, and a position facing the fixed contact portion;
The pin-receiving terminal comprises a holding terminal that holds a thermostat element that opens and closes contacts by a snap-action operation at a set temperature, and a terminal that is electrically connected to the holding terminal and connected to the outside. A motor starting/overload protection device characterized in that the thermostat element is located parallel to the outer surface of the motor. (2) The overload protection device includes a pin receiving terminal, a fixed contact portion electrically connected to the pin receiving terminal, and a snap action at a set temperature. It consists of a holding terminal that holds a thermostat element that opens and closes its contacts in operation, a heater element connected to the holding terminal, and a terminal connected to the heater element and connected to the outside, and the pin receiver. 2. The motor starting/overload protection device according to claim 1, wherein the terminal, the thermostat element, and the auxiliary heater are located parallel to the outer surface of the motor.