JPS6336070A - Protector for enclosed type electric compressor - Google Patents

Abstract

PURPOSE:To enable the easy connection of wires by connecting one end of an electromagnetic coil to one of the terminals of a protector and the other end directly to the conductive pins of a cluster in the enclosed vessel of an enclosed type electric compressor, using weld and the like. CONSTITUTION:Each of tabs 16A-16C as plate type terminal fittings is welded to each of conductive pins 15A-15C fixed to a cluster 13 via each of insulation materials 14A-14C. And a receptacle 18A is coupled to the tab 16A and the connection part 19A thereof is connected with the terminal 22 of a protector 20. Also, the terminal 22 is fixed to an enclosed box 21 and made to support the fixed end of a thermal reaction body T within the enclosed box 21. Also, the enclosed box 21 is directly connected with one end 24 of an electromagnetic coil for the main winding M of an electric motor via a terminal 21A. Furthermore, for the protector 20, one end of a heater H reacting to an electric current flowing in an auxiliary winding A is connected to the enclosed box 21 and the other end thereof to a terminal 23.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a heating plate made of a metal such as a bimetal that changes its υ shape depending on different temperatures, in order to protect the motor from overload in a closed type electric pressure machine. & A protector is provided in the airtight sieve body with a mechanism for driving a movable contact by a moving body and opening/closing a current flowing to the motor between the movable contact and a fixed contact forming a pair, in the airtight container of the compressor. The present invention proposes a protector for a hermetic electric compressor that is equipped with an improved mechanism that allows for easy installation.

[Background technique]

Conventionally, the protector for this type of hermetic electric compressor was a hermetic container a.
Methods such as embedding the coil in the coil end of the stator winding of the electric motor housed in the coil coil end, or tightly fixing it on the coil end and tying it with string are used. Then, it detects an abnormality in the current Q or temperature of the electric @ machine, cuts off the current supplied to the motor, protects the winding of the electric vJ Iso from overheating, and automatically returns to supply current to the electric @ Iso. However, if there is no abnormality, the operation continues as is, and if there is an abnormality, it is operated as a protection switch that shuts off and turns off the current again. Recently, due to the miniaturization of hermetic electric compressors, there are problems such as the space for attaching a protector to the coil end has become narrower, and the process of tying the protector to the coil end with thread is a time-consuming process.

[Summary of the invention]

The protector of the present invention includes a mechanism in which a pair of O contacts are opened and closed by a thermally responsive body such as a bimetal in a metal O-sealed casing, and the casing and one or more terminal pins electrically insulated from the casing. A conductor such as O is used as a switch terminal, and each terminal is provided with an attachment portion for electrical connection as described later. In the hermetic electric compressor in which this protector is used, the stator core of the electric motor is fixed directly to the inner surface of the hermetic container, and the rotor is pivotally supported so as to be rotated by the magnetic field of this stator. The compressor is connected to a compressor, and the heat medium gas such as Freon gas in the closed container is sent out from the discharge pipe of the closed container to do work, and then the heat medium gas is returned to the compressor again. In the airtight container, there is arranged a cluster in which a plurality of conductive N pins for connecting the electric @4 winding to an external power source are sealed to a metal annular body using an insulating material such as glass. One of the terminals of the protector and the motor winding are connected to the pin via the lead wire, or a receptacle is fitted at a predetermined position between the coil end of the electric spool and the cluster in the sealed container. Also, the protector is supported by being bundled with the lead wire. On the other hand, since the stator of the motor winding is directly fixed to the inner surface of the airtight container, the positions of the main winding and auxiliary winding, which are insulated and wound around the stator, are naturally determined. Since the rotor and its windings are also positioned, the temperature correlation between the protector and the motor windings is significant and provides an easy-to-install, economical seal to protect the motor windings. You can obtain a protector for type electric compressors.

[Invention O Example]

In FIG. 1, a closed container 10 is composed of a robust iron container portion 11 and a lid portion 12. A compressor P is disposed near the lower end of a rotating shaft S fixed to a rotating shaft of an electric motor, and its outer peripheral portion PO is fixed below an airtight container IO. The electric fixing device disposed surrounding the rotor & has its outer periphery extending from the center of the container portion 11 to the joint end E.
Fixed nearby. The outer periphery of the stator F is a sealed container 10
If the inner surface of is a circle, it is polygonal so that there is a gap in the axial direction rather than in close contact with the entire surface. The stator winding is electrically insulated and wound around the stator 1, and its coil ends W extend over the upper and lower ends of the stator 1, as shown in the figure, and are tied and formed with, for example, nylon thread. It is. Although a heat carrier gas such as pleon is not shown, lubricating oil O is shown at the bottom of the closed container 10. Is the discharge pipe 17 through which the heat medium gas is sent out by the compressor P a closed space? 910. The lid portion 12 of the airtight container 10 has a conductive pin 15A in a metal annular body.
In order to electrically insulate and support the 5B and 150, a cluster 13 hermetically sealed with glass is hermetically fixed. Conductive pins 15A and 15. of cluster 13. H・
As shown in FIGS. 2 and 3, a receptacle 150 is provided inside the airtight container to support the protector together with the lead wire at a predetermined position between the coil end of the motor winding and the cluster. is fitted.

FIG. 2 is a plan view viewed in the direction of the X-X arrow in FIG.・Conductive pin 15A・1 electrically insulated by 1G and fixed to the seal 71
5B/150 has a tab 16A/ which is a terminal fitting on a flat plate.
16B and 160 are welded. A receptacle/L'18A is fitted onto the tab 16A, and the receptacle 71/L'18A is fitted onto the tab 16A.
Connected to 18N is a lead wire 19A made of several tens of thin copper wires twisted together and coated with insulation, and this lead wire 19A is connected to a terminal 22 of the protector 20.

The terminal 22 is electrically insulated and fixed to the sealed casing 21 of the protector 20, and a bimetal or the like is squeezed into a shallow dish shape inside the sealed casing 21! The fixed end of the heat-responsive body T is supported by molding and snap operation (see FIG. 8).

A movable contact α is provided at the movable end of the thermally responsive body T,
The thermally responsive body T is heated to a predetermined temperature, e.g.
When the temperature exceeds 50°C, the electric circuit is opened, and when the temperature becomes lower than that, for example, 90'C or less, the electric circuit is closed. Terminal 21A attached to the part with the same potential as the sealed cylinder C4-21
A lead wire 24 is connected by a connector or directly to the main winding M of the YM, kjJ machine.
One end is connected to MIK. Also this protector 20
In order to be more sensitive to the current flowing through the auxiliary winding A of the electric vJ, a heater H is connected to a terminal 23 insulated and attached to the sealed casing 21, and a terminal 23 attached to the casing 21C+inside O at an appropriate position, respectively. It is connected to the. This heater (2) is made of nichrome wire or the like and is arranged so as to effectively exchange heat with the thermally responsive body (T). The terminal 23 is connected to one terminal A1 of the auxiliary winding A by a lead wire 25. The other end 2 of the main winding M of the electric wire is connected to a receptacle 18B via a lead wire 19B, which is fitted and connected to a tag 16B welded to the cluster 04 electric pin 15B. The other end A2 of the auxiliary winder is connected to the receptacle 180 via a lead wire 190, and is fitted into a tab 160 welded to the conductive pin 150 of the cluster. and a protector 2 as shown in FIGS. 1 and 2.
0 is supported together with lead wires 19A and 24, lead wires 19B-190, etc. at an appropriate position between the coil end W of the motor winding and the cluster hermetically fixed to the airtight container 10. If necessary, it is convenient to fix these lead wire groups together with a heat-shrinkable polyester tube as shown in the virtual ML in Fig. 2, or to bundle and fix the lead wire groups with a string-like material. be.

Regarding the heater H of the protector mentioned above (7), the heater H may be omitted if it is not necessary to have protective characteristics suitable for responding to changes in the auxiliary winding current of the electric VJ machine. In this case, one end A1 of the auxiliary winding AO and one end Mt of the main winding J spring may be short-circuited so that they have the same potential.

Cluster 13 of the hermetic electric compressor configured in this way
Connect one end of the power supply to the conductive pin 15A of the
When the other end of the power source is connected to the conductive pin 150 via a capacitor and energized, the rotor R of the motor rotates and drives the compressor 11F connected to the rotating shaft 8. The heating medium gas is axially passed through the gap between the stator 11 of the t-motor and the inner surface of the airtight container 10 and the gap between the stator F and the rotor box by the compressed rock P, and is sent out from the discharge pipe 17 as shown in the figure. After the work has been done through a device that does not work, it returns to the compressor P and circulates again, but the compressed heat medium gas flows through the electric motor in the axial direction and is sent out from the discharge pipe 17 provided in the first part of the closed container. In a hermetic electric compressor in which the motor stator is fixed to the inner surface of the hermetic container, heat exchange between the motor windings and the protector is well carried out by the heating medium gas. When the winding temperature becomes very high or the current becomes abnormal, the protector quickly responds and cuts off the current to the motor.

In addition, in the embodiments of the brooms 1 to 8, the receptacles 18A, 1813, and 180 are respectively) 1 tab 16A, 1
6B/160, but there is of course no problem even if the shape is fitted directly to the conductive pin.Furthermore, 19 lead wires are connected to the receptacle 18A, and these lead wires are connected to the terminals of the protector. 22, but it is clear that there is no problem in connecting the receptacle directly to the terminal 22 of the protector as long as the shape is dimensionally possible.

〔Effect of the invention〕

The sealed electric compression transport protector of the present invention described below is as follows:
One of the plurality of adhesive receptacles to be fitted onto the conductive pins of the cluster necessary for power supply to the electric motor is connected to one terminal of the protector, and the other adhesive receptacle VT/
The protector is supported at a predetermined position between the coil end and the cluster using the lead wires connected by the C-connection. This saves a lot of time and effort, and in the case of small electric la machines, because the coil end of the winding is small, there is no need for extra space to tie the protector as in the conventional case, and there is no need for extra materials. It has the excellent effect of being able to be made smaller by omitting the .

[Brief explanation of the drawing]

FIG. 1 shows a longitudinal sectional view of a hermetic electric compressor according to an embodiment of the present invention, and FIG. 2 shows a slightly enlarged plan view of FIG. 1 as viewed from the direction of the X-X arrow. FIG. 3 is a wiring diagram schematically showing electrical connections. 10... Sealed container, 18A-18E.
180-...Receptacle, 13...Cluster, 15A-15J3/150...
・Conductive pin, 20...Protector, 21・
...... Housing, 22... Terminal,
A・・・・・・Auxiliary winding, OM-ell
'...Contact, P...Motor stator, M...Main winding, P
......Compressor, General...Motor rotor, 8...Rotating shaft, T...
・・・・・・Thermo-responsive body, W・・・・・・Coil end. Procedures Amendment Written by the Commissioner of the Japan Patent Office on April 1, 1988 Black 1) Yu Akihiro 1 Indication of Case 1986 Patent Application No. 1804Ro 2 Name of Invention Protector for Hermetic Type Electric Compressor 3 Person who makes the amendment Relationship to the case (patent applicant) The full text and drawings of the specification attached to the application subject to the amendment, 549-4 Nakasuna-cho, Tenpaku-ku, Nagoya City. -, 1. Tortoise correction Description 1 Title of the invention Protector for a sealed electric compressor 2 Claims A motor stator is fixed to the inner surface of a sealed container, and a rotor is pivotally supported at the center of the rotor. In a hermetic electric compressor that is connected so that the compressor is operated by rotation, a cluster of multiple conductive pins sealed together is used to connect the windings of the motor to seven sources outside the hermetic container. A set of electrical contacts is fixed to the airtight container, and a set of electrical contacts is opened and closed by a heat-responsive body in a metal airtight casing, and the casing and a conductor disposed electrically insulated from the casing are connected to each other as a switch. A thermally responsive protector having a terminal is connected to one of the conductive pins of the cluster directly or through a receptacle to one of its terminals, and the end of the electromagnetic coil of the motor winding is directly connected to the hydraulic terminal. A protector for a hermetically sealed electric compressor, characterized in that the ends of the electromagnetic coil of the rotifer and motor winding are cracked. 3. Detailed Description of the Invention [Technical Field of the Invention] The present invention uses a thermally responsive body made of a metal, such as a bimetal, that changes shape depending on different temperatures, in order to protect the motor from overload in a hermetic electric compressor. A protector, which is provided in a metal hermetic housing with a mechanism that drives a movable contact and opens and closes a current flowing between the movable contact and a pair of fixed contacts, is installed in the hermetically sealed container of the compressor. The present invention proposes a hermetically sealed electric compressor protector that simplifies the process of connecting to the electric motor and the conductive pins of the cluster. [Background technology] Conventionally, the protector of this type of hermetic electric compressor has been embedded in the coil end of the stator winding of the motor housed in a hermetically sealed container, or has been tightly fixed onto the coil end. Methods such as tying them up with string were used. It then detects an abnormality in the current or temperature of the motor, cuts off the current supplied to the motor, protects the motor's windings from overheating, and automatically returns to supply current to the motor, leaving it as is if there is no abnormality. Dozens of thin copper wires were used to make the ends of the electromagnetic coils of the motor windings flexible in order to function as a protection switch that continues operation and repeatedly cuts off and energizes if an abnormality occurs. For emergency safety, connect the lead wires bundled together and wrapped in an electrically insulating coating and connect to the protector attached to the coil end, or use the lead wires to connect to the conductive pins of the cluster. The wiring and installation process was time-consuming and uneconomical. [Summary of the Invention] The protector of the present invention includes a well-known mechanism in which a pair of contacts are opened and closed by a thermally responsive body such as a bimetal in a metal hermetic sieve, and is electrically insulated from the housing and the housing. A conductor, such as one or more terminal pins, is used as the terminal of the switch, and electrical connections can be made to each terminal by a simple process as described below. In the hermetic electric compressor in which this protector is used, the stator core of the electric motor is directly fixed to the inner surface of the hermetic container, and an electromagnetic coil that generates a magnetic field is wound around this stator, and the stator is rotated by the magnetic force. The rotor is pivotally supported, and a compressor is connected to this rotating shaft, and the heat carrier gas such as Freon gas in the sealed container is sent out from the discharge pipe of the sealed container to do work. The heating medium gas is then returned to the compressor. A cluster is provided in the sealed container, in which a plurality of conductive pins for connecting the motor windings to an external power source are sealed to a metal annular body using an insulating material such as glass, and the conductive pins are connected to the terminals of the protector. By fitting one of the receptacles directly to the end of the electromagnetic coil of the motor or to the end of the electromagnetic coil, the motor and protector can be connected to the external circuit from inside the sealed container through the conductive pins of the cluster. It is designed to connect to. Therefore, the positional relationship between the electromagnetic coil of the motor and the four-volt pin of the cluster in the closed container remains constant regardless of whether the motor is stopped or not, and does not deteriorate at all. Therefore, the temperature correlation between the protelter and the motor winding is significant, and the end of the electromagnetic coil of the motor winding can be connected directly to the protector and 4-volt pin or receptacle without using a lead wire made of bundled thin wires. Through this, connection wiring with sufficient durability is possible, and a highly economical hermetic electric compressor protector can be obtained which greatly reduces the number of manufacturing steps. [Embodiment of the Invention] In FIG. 1, a closed container 10 is composed of a robust iron container portion 11 and a lid portion 12. A compressor P is disposed near the lower end of a rotating shaft S fixed to a rotor box of an electric motor, and an outer peripheral portion PO of the compressor P is fixed below an airtight container 10. The motor stator F, which is disposed surrounding the first and second electric motors R, has its outer portions 1, 1 and 1 fixed from the center of the holder portion 11 to the vicinity of the joint end E. If the inner surface of the closed container 10 is a circle, the outer periphery of the stator F is not in close contact with the entire surface but has a polygonal shape with a gap in the axial direction. The stator winding is electrically insulated and wound around the stator F, and its coil ends W extend over both the upper and lower ends of the stator F as shown in the figure, and are formed by tying and forming, for example, nylon thread. . Although a heat carrier gas such as freon is not shown, lubricating oil 0 is shown at the bottom of the closed container 1o. Discharge pipe 17 through which heat medium gas is sent out by compressor P
is provided at the top of the closed container 10. Airtight container 10
The lid part 12 has a conductive pin 15 inside a metal annular body.
In order to electrically insulate and support A, 15B, and 150, a cluster 13 made of glass is hermetically fixed. For the conductive pins 15A, 15B, and 15C of the cluster 13, the ends of the electromagnetic coils of the motor windings are directly welded to the protector or to the conductive pins of the cluster 18, as shown in FIGS. Connected to the conductive pins of the cluster via receptacles. FIG. 2 is a slightly enlarged plan view taken in the direction of the X-X arrow in FIG. A conductive pin 15A that is electrically insulated and sealed and fixed,
Tabs 16A, 16B, and 16C, which are terminal fittings on flat plates, are welded to 15B and 150. A beam receptacle 18A is fitted into the tab 16A, and a terminal 22 of the protector is connected to the receptacle 18A by a strong connecting portion 19A. terminal 2
2 is a thermally responsive body T which is electrically insulated and fixed to the sealed casing 21 of the protector 20, and which is formed by drawing a bimetal or the like into a shallow dish shape in the sealed casing 21 so as to be able to snap or pull. It supports the fixed end (see Figure 3). Thermal response body T
A movable contact C8 is provided at the movable end of the , and a fixed contact O fixed to a stationary member at the same potential as the sealed casing 21 is provided.
When the thermally responsive body T reaches a predetermined temperature, for example, 150° C. or higher, the electric circuit is opened, and when the temperature becomes lower than that, for example, 90° C. or lower, the electric circuit is closed. One end 24 of the electromagnetic coil of the main winding M of the motor is directly connected to the sealed casing 21, either directly or through a terminal 21A attached to a portion of the same potential. Also this protector 20
In this case, a heater H to sufficiently respond to the current flowing in the auxiliary winding A of the motor (with a lower energization rate than the current in the main winding M) has one end connected to the closed container 21 and the other end connected to the closed case 21.
The terminals 23 are electrically connected to terminals 23, respectively. The heater H is made of nichrome wire or the like and is placed at a position where heat exchange is effective with respect to the thermally responsive body T. Terminal 28 is the auxiliary winding Al7)! It is connected to one end 25 of the magnetic coil. Motor main winding M
The other end 19B is connected directly to the receptacle 18B, which has a tab 16B welded to the conductive pin 15B of the cluster.
Connected by fitting. The other end 19C of the auxiliary winding A is directly connected to the receptacle 180 and connected to the conductive pin 15C of the cluster.
It is fitted and connected to the tab 16C welded to. and the first
As shown in the figures and FIG. 2, the protector 20 is connected to the protector terminal 18A, the end 24 of the motor coil, and the motor main at appropriate positions between the coil end W of the motor winding and the cluster that is hermetically fixed to the closed container 10. One end 19B of winding M
It can be seen that it is supported by one end 190 of the auxiliary winding. If necessary, it is convenient to insulate the terminals of these electromagnetic coils with heat-shrinkable polyester tubes and fix them together, or to bundle and fix the lead wires with a cord-like material. Regarding the heater H of the protector mentioned above, it is provided with a protective characteristic particularly suitable for responding to changes in the auxiliary winding current of the motor, and if it is not necessary, the heater H can be omitted. It is clear that this is a good thing. In this case, one end of the auxiliary winding 11A and one end of the main winding may be at the same potential, that is, the respective ends 24 and 25 may be short-circuited. Cluster 13 of the hermetic electric compressor configured in this way
Connect one end of the power supply to the conductive pin 15A of the
When the other end of the power source is connected to the conductive pin 15C via a capacitor and energized, the rotor of the motor rotates and drives the compressor P connected to the rotating shaft S. The heat carrier gas is transferred by the compressor P to the stator F of the electric motor! : i It passes through the gap with the inner surface of the sealed container 10 and the gap between the stator F and the rotor R in the axial direction, is sent out from the discharge pipe 17, passes through a device not shown, does work, and then returns to the compressor P. The compressed P and medium gas flow through the electric motor in the axial direction and are sent out from the discharge pipe 17 provided at the top of the sealed container, and the motor stator is fixed to the inner surface of the sealed container. In hermetic electric compressors, heat exchange between the motor windings and the protector is carried out well by the heating medium gas, so when the motor is abnormal, the temperature of the windings becomes extremely high or the current becomes abnormal. Sometimes the protector responds quickly and cuts off the current to the motor. In the embodiment shown in FIGS. 1 to 3, each of the receptacles 18A, 18B, and 18C is a tab 16A. 16B and 16C, but there is of course no problem even if the shape is directly fitted to the conductive pins 15A, 15B, and 15C as long as there is no trace of electrical insulation. Furthermore, if the electromagnetic coils/I/19B and 19C of the electric motor are directly welded to the conductive pins 15B and 15C, the process will be further simplified. [Effects of the Invention] The hermetic electric compressor protector of the present invention described above has the following features:
Connect the windings of the motor to the conductive pins of the cluster, which are necessary for power supply to the motor. Connect one of the terminals of the electromagnetic coil to one terminal of the protector, and connect the terminals of the other coils to the closed type electric The protector is directly welded to the conductive pin of the cluster attached to the compressor's airtight container, or connected via a receptacle, and the protector is tied to the motor windings as in the past, and the lead wire connects the motor windings to the protector. Compared to the configuration in which the protector is connected to the conductive pins of the cluster, it is much less labor-intensive, and in the case of small motors, the coil ends of the windings are small, so extra space is required to place the protector in the conventional position. This has the excellent effect of eliminating unnecessary materials such as lead wires and greatly reducing the number of T on the wiring. 4. Brief Description of the Drawings FIG. 1 shows a hermetic electric compressor according to an embodiment of the present invention in a longitudinal sectional view. FIG. 2 is a slightly enlarged plan view of FIG. 1 viewed from the direction of the X-X arrow. FIG. 3 is a wiring diagram schematically showing electrical connections. 10・・・・・・・・・・・・Airtight container, 1
8A・18B・18C...I)+! 7 Thakur, 13
・・・・・・・・・・・・Cluster, 15A
・15B・15c...4 electric pin, 20...
......Protector, 21...
・・Casing, 22・・・・・・・・・・Terminal,
A: Auxiliary winding, CM, C
F: Contact, F: Motor stator, M: Main winding, P
・・・・・・・・・Compressor, Le・・・・・・・・・・
Electric VJ machine rotor, S...Rotating shaft, T...
...Thermal response body, W... Coil end. Applicant: Susumu Ubukata, '7-' Figure 3

Claims (1)

[Claims] In a hermetically sealed electric compressor, a motor stator is fixed to the inner surface of a hermetic container, a rotor is pivotally supported at the center of the stator, and the compressor is operated by the rotation of the rotor. A cluster with a plurality of sealed conductive pins for connecting the winding to a power source outside the sealed container is fixed to the sealed container, and a set of electrical contacts are formed in the metal sealed casing by means of a thermally responsive body. A thermally responsive protector is configured to open and close, and has the casing and a conductor disposed in an electrically insulated manner as switch terminals, and one of the conductive pins of the cluster is connected to one of the terminals of the thermally responsive protector. A receptacle that fits into the motor is connected directly or via a lead wire, and the other terminal is connected to a lead wire that is connected to one end of the motor winding,
The other end of the motor winding is connected via a lead wire to a receptacle that fits into the conductive pin of the cluster, and these lead wires and the protector are wired together, and by fitting each receptacle to the conductive pin, A protector for a hermetic electric compressor, characterized in that the protector is supported by a lead wire at a predetermined position between a coil end of a motor winding and a cluster.