JP3121572B2 - Hermetic electric compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor, and more particularly to a hermetic electric compressor suitable for protecting an electric motor from overheating of a compressor in a freezer. 2. Description of the Related Art A completely sealed compressor for a refrigerator has conventionally been provided with a motor for driving the compressor inside a completely sealed container filled with a cooling fluid. In order to electrically connect the electric motor to the electric circuit and operate the compressor, a conductive lead pin is provided to protrude through the wall of the container while being electrically insulated from the wall of the container. 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 caused by a failure of the motor. Conventionally, the protection device is also connected in the motor circuit in such a manner as to stop the operation of the motor in response to an overcurrent state of the motor resulting from such a failure state and prevent the motor from overheating. Mounting the motor protector on top of the motor in the container is usually done by the manufacturer of the compressor for the refrigerator using the motor protector supplied by another manufacturer, which is a significant inconvenience. And there was a disadvantage that costs were involved. It also resulted in mounting the motor protection device in an uneven manner on the motor, so that the motor could not get the proper protection or had troublesome tripping in the device. [0003] It is an object of the present invention to provide a new and improved fully sealed electric compression device filled with a cooling fluid , wherein the device is in a fully sealed container of the device. And a rotary compressor can be used, and its assembly is easy and convenient, and the assembly is robust and thin .
An object of the present invention is to provide a hermetic electric compressor characterized in that its response characteristics to heat and current are reliable. It is a further object of the present invention to provide a new and improved motor protection unit for use in such a compressor for a refrigerator. [0004] Compressors of this type and motors for operating the compressors are conventionally conventionally arranged in fluid-filled, completely sealed containers. In that regard, when a rotary compressor is used in such a completely sealed fluid-filled container, operation of the compressor with an electric motor tends to create a virtually uniform temperature level in the container throughout all parts of the container. It turns out that there is. [0005] That is, the temperature is subject to changes, such as a rise in temperature due to the occurrence of an overcurrent or other fault condition within the device, but such temperature changes are subject to all components of the enclosure. Through which the temperature changes tend to be quickly represented. Therefore, according to the present invention,
A generally conventional heat and current responsive motor protection device is mounted within the container of the device via a lead pin projecting through the wall of the container. The arrangement of the lead pins allows the protection device to be easily and economically connected to the motor circuit, and the protection device lags behind a selected rise of a virtually uniform temperature in the container to protect the motor from overheating. It is arranged so that it responds without. That is,
The thermal response characteristic of the motor protector interrupts the operation of the motor in response to the selected rise in said substantially uniform temperature, which arises in the sealing device from the operation of the rotary compressor in the sealing container, It has been chosen to protect the motor from overheating temperatures in the container. The motor protection device comprises a device for contacting each lead pin, a cluster block having leads and terminals coming out of the cluster block for electrically connecting the pin to the motor, and a device when the block is placed on the pin. And a motor protection element to be placed on the cluster block to be placed at the selected location of the 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. BRIEF DESCRIPTION OF THE DRAWINGS Other objects, advantages and details of the new and improved refrigerating compressor and motor protection unit of the present invention are described in detail below with reference to the drawings of a preferred embodiment of the present invention. Is shown in 1 and 3, the new and improved refrigerator compressor of the present invention includes a refrigerator compressor 12 and a motor 14 for operating the compressor, which are located in a completely sealed container 16. It is shown. Cooling fluid 18 surrounds the compressor and electric motor in the vessel and includes a plurality of electric motor leadthrough pins 20,2.
2 and 24 exit through the container wall 16.1 to the container and in spaced-apart, electrically isolated relation to electrically connect the motor to the electrical circuit. In accordance with the present invention, the compressor 12 is of the conventional rotary type, and this type of compressor is operated when the compressor 12 operates normally by the electric motor 14 and various fault conditions occur in the compressor. To provide a substantially uniform temperature level in such a fluid-filled, completely sealed container through all parts of the container 16 in the event of undesired temperature increases, such as may occur from the operation of an electric motor. Is known. For example, the compressor 12 is preferably of a rotary type, as described in Part III, Chapter 12, of the Handbook-Equipment of 1983, published by ASHRAE in 1983, and the compressor is not available. It is arranged to be operated by a conventional electric motor placed in a sealed container 16 in a conventional manner. Also, the cooling fluid 18 is supplied to the container 16 in a conventional manner.
It is desirable to include a conventional dielectric cooling fluid, such as freon gas, which is maintained at an internal pressure. In addition, lead pin 20,
22 and 24 are sealed to each other by a glass sealing device 28 and in an electrically insulated relationship with each other;
Embedded in the fusite cap 26 with a pin secured in the opening 26. 1 of the cap 26, and as shown by the cap 26. 2, the container wall 1 is made in a conventional manner.
It is desirable to be welded to 6.1. In accordance with the present invention, a new and improved motor protection unit is located in the vessel 16 at the inner ends of the lead pins 20, 22 and 24, and the substantially uniform temperature level variation within the vessel 16 is provided. Motor 1 to respond to heat
4 to protect the motor from overheating and to facilitate simple, economical and reliable assembly of the compressor for the refrigerator. As shown in FIGS. 1-3, motor protection unit 30 includes a cluster block body 32 of a rigid electrically insulating material such as polycarbonate and the like, and any conventional resilient electrical contact device 34, Desirably, 36 and 38 are disposed on the block to resiliently grasp and electrically connect to the respective lead pins 20, 22 and 24. In accordance with the present invention, an optional conventional thermally responsive motor protection element 40, such as the thermal and current responsive protector shown in U.S. Pat. No. 4,485,231, is placed over the cluster block body. As such, the motor protection element 40 is easily connected to the electrical circuit of the motor 14 and responds to the substantially uniform temperature within the container 16 when the unit 30 is placed on the lead pins as described. So that it is placed in a predetermined position in the container. [0010] Since the motor protector 40 is described in detail in the aforementioned U.S. patent, although not described in detail here,
Needless to say, the protection device 40 is therewith any well-known motor protection device having a thermally responsive device which can move in accordance with the selected temperature rise of the thermally responsive device to open the electrical circuit through which
The protective element 40 is connected to the motor circuit so as to open the motor circuit when the thermoresponsive device moves in response to the selected temperature increase of the thermoresponsive device. In accordance with a preferred embodiment of the present invention, cluster block 32 has a size of 32.4 to form space 32.4.
2.3 The two parts which are fixed together by riveting or ultrasonic fusion etc., ie, formed by insulating material
First part having a side wall and a bottom wall formed and one side open.
Bond to the open surface of the minute 32.1 and the first part
Made of a second part 32.2 of insulating material . An opening 32.5 is provided in the block portion to fit the respective lead pins 20, 22 and 24. Needless to say, the lead pins are connected to the block openings 32.
The electric contact device , which resiliently grasps the lead pin when inserted into the boss 5 , is located at the bottom of the first part by the positioning boss 32.6.
It is positioned on the wall and arranged in a plane . Each of the electrical contact device is provided with a resilient contact portion 34.1,36.1,38.1 welded to a relatively rigid contact arms or blades 34.2,36.2,38.2, also leads The devices 42.44 are each connected at one end to two of the contact blades 34, 36 so as to exit outside the cluster block 32. The electric terminals 42.1, 44.1 attached to the opposite ends of these leads are electrically connected to the corresponding terminals of the electric motor 14 as shown in FIGS. One of the plurality of resilient contacts 38.1 is a first portion.
Metal blade 38.2 of conductive member extending parallel to the bottom wall
(Including an additional metal blade 38.4)
The first terminal portion of the reactive protector is connected and fixed to the first terminal portion;
The blade has a wider portion and a narrower portion than the wide portion.
A narrow portion, including a boundary between the wide portion and the narrow portion.
Part is fixed by the positioning member 32.6,
The wide part is connected to the elastic contact part and the narrow part is the side
Through the opening 32.7 in the wall,
And the second end of the thermoresponsive protector
The slave part is electrically connected to a predetermined winding of the electric motor.
I have. Additional resilient spring contact portions 38.3 Additional metal blanking <br/> rate de, ie are welded to the extending portion 38.4 opening 3 of the additional metal blade cluster block
Extending to 2.7, the contact spring member 38.3 resiliently grasps and is electrically connected to the first 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. For mounting removably the motor protector 40 on the electric motor protection unit 30, the first
A bottom wall and a second portion of the portion extend from the side wall and
First and second extending portions 32.8 opposed to each other,
A holding portion 32.9 is formed on each of the first and second extending portions.
And at least a part thereof is exposed to the cooling fluid.
As described above, the thermally responsive protector 40 is provided between the first and second extending portions.
The holding portion is provided. In the arrangement, the motor protection unit 30 has an economical structure. That is, the cluster block 32 is easily and economically placed in the container 16 by closely fitting the openings of the cluster block to the pins 20, 22, and 24 so that the cluster block 32 can be removably placed on the pins. . Attached to the protection unit 30 motor protector 40 is of the conventional type. It can easily be 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 will result in a motor or refrigerator compression. When a failure of the device is induced, the power supply circuit of the motor can be shut off to prevent overheating of the motor. Motor protection unit 30 is a motor protector 4
0 can be easily and economically connected to an electrical circuit. Motor protector 40 also incorporated easily and economically to the electrical circuit, it is possible to interrupt the operation of the electric motor in response to an increase in the selected consuming container assembly temperature. Of course, while certain embodiments of the refrigerator compressor and motor protection unit of the present invention have been described by illustrating the present invention, the present invention includes all modifications and equivalents thereof that fall within the scope of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partial longitudinal sectional view of a refrigerator compression apparatus of the present invention. FIG. 2 is a schematic partial cross-sectional view taken along line 2-2 of FIG. 1 illustrating a motor protection unit of the present invention. FIG. 3 is a schematic plan view showing the electrical connection of the motor protection unit of the present invention and the freezer compressor of the present invention. [Description of Reference Numerals] 12 compressor 14 motor 16 sealed container 18 the cooling fluid 20, 22, 24, the lead pin 26 cap 30 motor protection unit 32 cluster block 34, 36, 38 elastic electric contact device 40 thermally responsive motor protector

────────────────────────────────────────────────── (5) References JP-A-56-107990 (JP, A) US Patent 3,586,910 (US, A) US Patent 3,016,183 (US, A) US Patent 3,622,948 (US, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F04C 29/00 F04B 39/00 106 F04B 49/10 331 F04C 29/10 331

Claims (1)

(57) [Claims] A hermetic electric compressor including an electric motor and a compressor driven by the electric motor, the hermetic electric compressor having a sealed container filled with a cooling fluid therein , wherein the one side has a side wall and a bottom wall formed of an insulating material.
Open first part and open face of the first part
And a second portion of an insulating material coupled to the first portion.
A space is formed therein by the minute portion and the second portion , a plurality of elastic contact portions are planarly arranged in the space, and the first
A bottom wall and a second portion of the portion extend from the side wall and are
And a first and a second extending portion facing the first and second portions.
Are respectively the holding portion on the extending portion of the formation, the thermally responsive protector as at least a portion thereof is exposed to the cooling fluid
A block to be held by the holding portion is provided between the first and second extending portions , and an opening through which a lead pin fixed in the closed container can be inserted is provided on a bottom wall of the first portion of the block . Formed,
Wherein the plurality of resilient contact portions for retaining the lead pins elastically in a position which is aligned with the opening is arranged, said double
Number of resilient contacts are each located on the bottom wall of the first portion
Is determined fixed, a protection element to open the electrical circuit and the heat responsive protectors in response to the temperature rise that is selected, and a housing which incorporates the protective element, in the housing, respectively and the electrical contacts of the protective element Electrically connected first and second terminal portions are provided, and one of the plurality of elastic contact portions is flat on a bottom wall of the first portion.
Fixedly connected to said first terminal portion of said heat responsive protector via the metal blade of the conductive members extending in the row, the metal blanking
The lade has a wide wide part and a narrower width than the wide part.
Having a narrow portion and including a boundary between the wide portion and the narrow portion
The part is fixed by the positioning member, and the wide part is
The narrow portion connected to the elastic contact portion forms an opening in the side wall.
Connected to the first terminal of the thermo-sensitive protector.
And the second terminal portion of the thermoresponsive protector is
The block is electrically connected to a predetermined winding of the machine, the block is mounted at right angles to the metal terminal through the opening, and is disposed close to the inner wall of the closed container. Electric compressor. 2. 2. The block of claim 1, wherein the hermetic container has a heucite cap for holding the lead pin such that the lead pin is insulated and hermetically sealed, respectively, and a second portion of the block facing the huscite cap. Is a hermetic electric compressor to which the block is attached so as to abut on the huscite cap.