JP2748314B2 - Hermetic electric compressor - Google Patents

Description

The present invention is in the field of electric motors, and the present invention is particularly directed to the use of electric motors from overheating of compressors for certain types of refrigerators (e.g., refrigerators, air conditioners, and equipment using a refrigeration cycle such as a showcase). This is a sealed electric compression engine that responds to the current and temperature to be protected. Fully sealed refrigerator compressors usually have an electric motor operating the compressor in a fluid-filled completely sealed container. Lead through pins extend through the container wall to the container wall and in a mutually sealed and electrically insulated relationship for electrically connecting the motor in an electrical circuit to operate the compressor. . The motor protection device is mounted on the motor inside the container using a bracket or the like so as to thermally respond to an increase in the temperature of the motor resulting from the occurrence of a fault condition in the motor. Normally, the protection device is also connected in the motor circuit in such a way as to interrupt the operation of the motor in response to an overcurrent condition of the motor resulting from such a fault condition and to prevent overheating of the motor. Mounting the motor protector on top of the motor in the container is usually performed by the manufacturer of the compressor for the refrigerator using a motor protector supplied by another manufacturer, With significant inconvenience and cost. It also causes the motor to be fitted with a motor protection device in a non-uniform manner, so that the motor may not get the correct protection and may cause troublesome tripping in the device. One object of the present invention is to provide a new and improved fully-sealed compressor for a refrigerator, to provide such an apparatus utilizing a rotary compressor in a fully-sealed container of the apparatus, which is easy and easy to assemble. It is an object of the present invention to provide such a device which is convenient and whose thermal and current response characteristics are reliable, and to provide a new and improved motor protection unit for use in such a compressor for a refrigerator. Briefly, the new and improved refrigerator compressor of the present invention includes a rotary refrigerator compressor. Compressors of this type and the electric motors that operate the compressors are arranged in a conventional manner in a completely filled, fluid-filled container. In that respect, when a rotary refrigerator compressor is used in such a completely sealed fluid-filled container, operation of the compressor by means of an electric motor results in a virtually uniform temperature level in the container through all parts of the container. It has proven to be prone to making. That is, the temperature is subject to changes such as an increase in temperature due to the occurrence of an overcurrent or other fault condition in the device,
Such temperature changes tend to be quickly manifested in the uniform temperature level change throughout all components of the enclosure. Thus, in accordance with the present invention, a generally conventional heat and current responsive motor protector is mounted within the container of the device by a lead through pin that extends through the wall of the container. In that arrangement, the protection device is easily and economically connected to the motor circuit, and the protection device responds without delay to a selected rise of a virtually uniform temperature in the container to protect the motor from overheating. Is placed as That is, the thermal response of the motor protection device interrupts the operation of the motor in response to a selected rise in the substantially uniform temperature that arises in the sealing device from the operation of the rotary compressor in the sealed container. And thereby protect the electric motor from overheating in the container. The motor protection device has a device that comes into contact with each lead through pin, the cluster block with leads and terminals coming out of the cluster block to electrically connect the pin to the motor, and when the block is placed on the pin. Preferably, it is mounted in a motor protection unit that includes a motor protection element that is placed over a cluster block to be placed at a selected location on the equipment container. The use of such a motor protection unit further facilitates convenient and economical assembly of the compressor for the refrigerator, while ensuring proper heat and current response by the protection device and preventing overheating of the motor in the device. Other objects, advantages and details of the new and improved refrigerator compression apparatus and motor protection unit of the present invention are:
The preferred embodiment of the present invention is illustrated in the following detailed description of the drawings. From the drawing 10 of FIGS. 1 and 3, the new and improved refrigeration of the present invention is shown to include a refrigerator compressor 12 and a motor 14 for operating the compressor, which are located in a completely sealed container 16. A mechanical compression device is shown. Cooling fluid
Reference numeral 18 surrounds the compressor and motor in the container, and a plurality of electrically conductive leadthrough pins 20, 22, and 24 are electrically isolated to and from the container to electrically connect the motor to the electrical circuit. In relation, it emerges through the wall 16.1 of the container. In accordance with the present invention, the compressor 12 is of the conventional rotary type, and this type of compressor may experience various fault conditions during normal operation of the compressor 12 by the motor 14 and within the compressor. It has been found that in the event of an undesired increase in temperature, such as that which arises from the operation of the motor, a virtually uniform temperature level is provided in such a fluid-filled, completely sealed container through all parts of the container 16. doing. For example, the compressor 12 is preferably a rotary type as described in Part III, Chapter 12 of Handbook-Equipment of 1983, published by ASHRAE in 1983, and the compressor is not available. It is arranged to operate by a conventional motor placed in a sealed container 16 in a conventional manner. Also, the cooling fluid 18 preferably comprises a conventional dielectric cooling fluid, such as freon gas, which is maintained at the pressure within the vessel 16 in a conventional manner. The lead through pins 20, 22 and 24 are also sealed to each other by the glass sealing device 28 and in a mutually sealed and electrically insulated relationship.
It is embedded in a fusite cap 26 with a pin fixed in the opening 26. 1 of the cap 26, and the cap is 26.2
Preferably, it is welded to the container wall 16.1 in a conventional manner as indicated by. In accordance with the present invention, a new and improved motor protection unit is placed in the vessel 16 at the inner ends of the leadthrough pins 20, 22 and 24, and provides for the substantially uniform temperature level variation within the vessel 16. It is thermally responsive to the electrical circuit of the motor 14 to protect the motor from overheating and to facilitate simple, economical and reliable assembly of the compressor for the refrigerator. As shown in FIGS. 1 to 3, the motor protection unit
30 includes a cluster block body 32 of a rigid electrically insulating material, such as polycarbonate, and any conventional resilient electrical contact devices 34, 36 and 38 resilient the respective lead through pins 20, 22 and 24. It is desirable to be placed on the block so that it can be grasped and electrically connected to them. In accordance with the present invention, any conventional thermal-responsive motor protection element 40, such as the thermal and current-responsive protector shown in U.S. Pat.
Since it is placed on the body, the motor protection element is
Easily connected to 14 electrical circuits and unit 30
Is positioned in the container so as to respond to the substantially uniform temperature in the container 16 when placed on a lead-through pin as described. Since the protection element 40 is described in detail in the above-mentioned patent, it will not be described in detail here, but it goes without saying that the protection element 40 will be embedded in the protection element in response to a selected temperature rise of the thermo-responsive device through which the electric circuit is opened. Any known motor protection element having a thermally responsive device that can be moved, the protection element being connected to the motor circuit when the thermally responsive device moves in response to the selected temperature increase of the thermally responsive device. The motor circuit is opened. In the preferred embodiment of the present invention, cluster block 32 is made of two parts 32.1 and 32.2 which are secured together, such as by riveting or ultrasonic fusion, at 32.3 to form chamber 32.4. Each lead through pin 2
An opening 32.5 is provided in the block portion to match 0, 22 and 24. Needless to say, when the pin is inserted into the opening 32.5 of the block, the contact boss 32.6 is used to arrange the contact device for resiliently grasping the lead-through pin.
Inside the 32.4 is a resilient contact device. The contact devices are each relatively rigid contact arms or blades.
Resilient contact parts 34.1, 36 welded to 4.2, 36.2, 38.2.
1, 38.3, and the lead wire device 42.44 is connected at one end to each of two of the contact blades 34.36 so as to exit the cluster block 32. The electric terminals 42.1, 44.1 attached to the opposite ends of these lead wires are electrically connected to the corresponding terminals of the electric motor 14 as shown in FIGS. The additional elastic spring contact part 38.3 is welded to an additional blade part 38.4 of the remaining contact device, which blade part is open from the cluster block.
Since it extends to 2.7, the contact spring member 38.3 elastically grasps and electrically connects the terminal 40.1 of the motor protector outside the cluster block chamber 32.4. The additional lead 46 is connected at one end to the second terminal 40.2 of the motor protector and has an additional terminal 46.1 attached at its opposite end which is connected to the corresponding terminal of the motor 14. Motor protection unit
In order to removably mount the motor protector 40 on the upper part 30, the motor protector 40 is combined with the motor protector 40 and the elastic contact spring part 3
To cooperate with 8.3, the positioning boss 32.8 preferably provides a detent device 32.9 or the like. In that arrangement, the motor protection unit 30 has an economic structure. It is a cluster block on a pin
Place pins 20, 22, and 24 so that 32 can be removed freely.
The cluster block is easily and economically placed in the container 16 by matching the openings of the cluster block. The motor protector 40 attached to the protection unit 30 is of a conventional type. It is easily supplied with an operating temperature selected to be thermally responsive to a substantially uniform selected rise in temperature within the vessel 16, whereby such a rise in temperature may cause a failure of the motor or compressor compressor. The circuit of the motor is shut off when the condition arises to prevent overheating of the motor. The motor protection unit 30 is easily and economically connected to the electric circuit of the motor 14. A motor protector 40 is also easily and economically integrated into the electrical circuit to interrupt operation of the motor in response to such a selected temperature increase in the container of the device. Of course, while a particular embodiment of the compressor and motor protection unit 30 of the present invention has been described by illustrating the present invention, the present invention is intended to include all modifications and equivalents thereof that fall within the scope of the appended claims. including.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view of a compressor for a refrigerator according to the present invention along the longitudinal axis, and FIG. 2 is a line 2-2 in FIG. 1 illustrating an electric motor protection unit of the present invention. FIG. 3 is a schematic view showing an electric connection between the motor protection unit of the present invention and the compressor for a refrigerator according to the present invention. Description of symbols 12 ... Compressor; 14 ... Motor; 16 ... Container; 18 ... Cooling fluid; 20,22,24 ... Lead through pin; 26 ... Cap; 30
…… Motor protection unit; 32 …… Cluster block; 3
4, 36, 38 ... contact device; 40 ... motor protection element

Claims (1)

(57) [Claims] (A) a closed container including a motor and a compressor driven by the motor and filled with a cooling fluid; and (b) a plurality of conductive lead pins attached to the closed container and provided in the closed container. A terminal block; and (c) a cluster block disposed in the closed vessel so as to face the terminal block, and for providing an electrical connection between the winding of the electric motor and the terminal block; The cluster block includes a plurality of conductive contact devices,
At least a protector including a thermo-responsive switch capable of responding to the heat of the cooling fluid in the closed container, and a holding portion for holding the protector, wherein the plurality of conductive contact devices are the plurality of lead pins. The protector is positioned by a positioning member so as to respectively correspond to the positions of the plurality of lead pins. The protector comprises: a first terminal portion electrically connected to one of the contact devices; A second terminal portion that is electrically connected to a predetermined winding; and the protector is configured to hold the cluster block so that at least a part thereof is exposed to the cooling fluid in the closed container. A hermetic electric compressor characterized by being held by a section. 2. (A) a closed container including a motor and a compressor driven by the motor and filled with a cooling fluid; and (b) a plurality of conductive lead pins attached to the closed container and provided in the closed container. A terminal block; and (c) a cluster block disposed in the closed vessel so as to face the terminal block, and for providing an electrical connection between the winding of the electric motor and the terminal block; The cluster block includes a plurality of conductive contact devices,
At least a protector including a thermo-responsive switch capable of responding to the heat of the cooling fluid in the closed container, and a holding portion for holding the protector, wherein the plurality of conductive contact devices are the plurality of lead pins. A plurality of resilient contact portions for holding the plurality of contact arms, and a plurality of contact arms, the at least one portion of the protector having an extension portion extending from at least one of the plurality of contact arms. The protector is disposed at a position where the protector can be exposed to the cooling fluid, a first terminal portion of the protector is electrically connected to the extending portion, and a second terminal portion has a predetermined winding of the electric motor. A hermetic electric compressor characterized by being electrically connected to the compressor.