JPH05321853A - Sealed electric compressor - Google Patents

Abstract

PURPOSE:To easily fit a thermal switch to a sealed electric compressor and ensure the protective action. CONSTITUTION:A sealed electric compressor has a motor 6 and a compressor 2 in a housing 1. A thermal switch 14 is airtightly fitted to the discharge side housing 1B of the sealed electric compressor via a terminal board 13 by welding to obtain a good heat exchange relation with a refrigerant. The thermal switch 14 is fitted to the discharge side housing 1B, its fitting is facilitated, and trouble of temperature detection due to the effect of a suction refrigerant are eliminated in the low-pressure housing type sealed electric compressor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed electric compressor in which a thermoresponsive switch is attached to the discharge side housing of the compressor in order to protect the electric motor in response to an abnormal temperature of the refrigerant on the discharge side. Regarding compressors.

[0002]

2. Description of the Related Art A conventional hermetic electric compressor will be described with reference to the drawings. A rotary electric compressor shown in FIG. 12 has a housing 101 having an electric motor 102 and a compressor 103.
Is hermetically sealed. A through hole is provided in the housing 101, and the airtight conductive terminal 107 is airtightly fixed. A conductive terminal pin 108 is fixed to the airtight conductive terminal 107 in an airtight manner by penetrating the airtight conductive terminal and electrically insulated from each other by an electrically insulating filler. A socket 109 is attached to the inside of the housing 101 of the conductive terminal pin 108 and is electrically connected to the electric motor 102.
A power source (not shown) is connected to the outside of the housing.

A suction pipe 104 is airtightly fixed from the housing 101 to the compressor 103.
The refrigerant introduced into the nozzle 3 is compressed and discharged into the housing 101. The discharged refrigerant passes through the gap between the electric motor 102 and the housing 101 and is sent from the discharge pipe 105 to a refrigeration unit (not shown) or the like.

In the hermetic electric compressor having such an arrangement, the heat-actuated switch 106 is electrically insulated by a suitable electric insulating material, for example, a Mylar tube, and attached to the coil of the electric motor 102 by a strap. Or, it is integrally attached to a socket made of an electrical insulator that houses a receptacle connected to a conductive terminal pin of an airtight conductive terminal. In the rotary electric compressor, since the electric motor 102 is exposed to the passage of the discharge refrigerant in order to make the inside of the housing 101 the refrigerant discharge side of the compressor as described above, the discharge refrigerant and the electric motor are attached by mounting the heat responsive switch 106 as described above. The heat-responsive switch 106 can quickly detect the temperature rise of 102.

[0005]

However, in a hermetic electric compressor having a different arrangement of the electric motor and the compressor, or a different arrangement of the discharge side and the suction side, the structure and arrangement of the protective switch for the electric motor, etc. A new technical idea was needed.

There is also a scroll type electric compressor having a so-called low-pressure housing having a structure in which a relatively low-temperature suction refrigerant is flowed to the electric motor side of the housing to cool the electric motor. In a hermetic electric compressor having such a structure, the temperature of the scroll compressor may be higher than the temperature of the electric motor, or if a heat-responsive switch is attached to the electric motor side as described above, the electric motor will be affected by the suction refrigerant. Alternatively, part of the heat-actuated switch may be unevenly cooled by the suction refrigerant. Therefore, it is difficult to detect the temperature representative of the temperature of the electric motor, the compressor, or the refrigerant at one location, and there is a problem that the temperature rise cannot be accurately detected.

In addition, in the conventional mounting of a heat-actuated switch,
There is a problem that it is troublesome to attach a tube or the like made of an electric insulating material and attach it to the coil of the electric motor with a binding string or the like.

A so-called direct cut system in which the heat-operated switch directly cuts off the power supply to the electric motor,
With a so-called pilot duty type that controls the energization via another control circuit, an airtight conductive glass terminal with a different number of terminal pins is used depending on whether it is necessary to draw the detection signal from the heat-responsive switch to the outside of the container. Had to do.

[0009]

Therefore, in the hermetic electric compressor according to the present invention, the electric motor and the compressor driven by the electric motor are arranged in the housing in the direction of the rotation axis, and are provided on the suction side of the compressor. A suction pipe for sending suction refrigerant to the electric motor side housing penetrates the wall of the housing and is hermetically connected, and the refrigerant sucked from the suction pipe is compressed by a compressor, and the wall of the housing on the discharge side of the compressor. In a so-called low-pressure housing type hermetic electric compressor in which the discharge pipe is airtightly connected to the hole formed in the hole, the discharge hole of the housing is formed so that the heat exchange relationship with the refrigerant discharged from the compressor is good. A heat-responsive switch is airtightly attached to the through hole to stop the power supply to the electric motor in response to an abnormal temperature exceeding a predetermined temperature, or output an abnormal alarm to control the electric motor. You .

Another feature of the present invention is to hermetically fix a metal closed container of a heat-actuated switch to a hole formed in a circular metal terminal plate and hermetically seal the periphery of the terminal plate. This is because it is airtightly fixed to a hole formed on the discharge side of the housing of the compact compressor.

Another feature of the present invention resides in that a part of the metal hermetic container of the heat-actuated switch is directly and airtightly fixed to a hole formed on the discharge side of the housing of the hermetic compressor. ..

Another feature of the present invention resides in that the metal closed container of the heat-actuated switch is directly airtightly fixed to the hole formed in the airtight conductive terminal of the hermetic compressor.

Another feature of the present invention is that an airtight conductive terminal, which is airtightly attached to a hole formed in a wall of the housing of the hermetic compressor and connects a power source outside the housing and an electric motor inside the housing, is thermally activated. It is to constitute a part of the metal closed container of the switch.

Still another feature of the present invention is that an electric motor and a compressor driven by the electric motor are arranged in the housing in a rotation axis direction, and a suction pipe through which a suction refrigerant flows passes through a wall of the housing. A housing that is airtightly connected, compresses the refrigerant sucked from the suction pipe by a compressor and discharges it into the housing, and the discharge pipe is airtightly connected to a hole formed in the wall of the housing, and serves as a discharge refrigerant passage. In a so-called high-pressure housing type hermetic electric compressor in which an airtight conductive terminal for connecting an external power supply and an electric motor is airtightly attached to a hole formed in the wall of the compressor, the heat exchange relationship with the refrigerant discharged from the compressor is A metal closed container of the heat-actuated switch is airtightly fixed in a hole formed in a circular metal terminal plate so as to be good, and a discharge side housing of the hermetic compressor is provided near the peripheral portion of the terminal plate. Put on It is characterized in that it is fixed airtightly in a hole, and the heat-responsive switch stops the power supply to the electric motor in response to an abnormal temperature exceeding a predetermined temperature, or outputs an abnormal alarm to control the electric motor. And

Another feature of the present invention is that, in the above-mentioned high-pressure housing type hermetic electric compressor, a hole formed in the hermetically conductive terminal so that the heat exchange relationship with the refrigerant discharged from the compressor is improved. Further, the metal closed container of the heat responsive switch is directly airtightly fixed, and the motor is controlled by the heat responsive switch in response to an abnormal temperature exceeding a predetermined temperature.

Another feature of the present invention is that, in the above-mentioned high pressure housing type hermetic electric compressor, it is airtightly attached to a hole formed in the wall of the housing to connect a power source outside the housing to an electric motor inside the housing. Airtight conductive terminal
The heat-responsive switch constitutes a part of a metal closed container, and the heat-responsive switch controls an electric motor in response to an abnormal temperature exceeding a predetermined temperature.

Another feature of the present invention is a thermal deformation such as a bimetal which is formed into a substantially circular dish shape and is adapted to perform a sudden jump reversal operation at a first operating temperature and a sudden recovery at a second operating temperature. It has a material and a movable contact plate that gives a biasing force to the movable contact so as to come into contact with the fixed contact, and the movable contact plate is driven by the reversing operation of the heat-deformable material, which has excellent vibration resistance. The heat-actuated switch is provided in the above hermetic electric compressor.

Another feature of the present invention is that the hermetic electric compressor is a scroll compressor.

Another feature of the present invention is that an electric motor and a compressor driven by the electric motor are arranged in the housing in a rotation axis direction, and a suction pipe through which a suction refrigerant passes through the compressor penetrates a wall of the housing. Are connected in an airtight manner, the refrigerant sucked from the suction pipe is compressed by a compressor and discharged into the housing, and the discharge pipe is connected in an airtight manner to the hole formed in the wall of the housing, and the discharge refrigerant passage and An airtight conductive terminal for connecting the external power supply and the electric motor is airtightly attached to the hole made in the wall of the housing, and the heat-actuated switch of the heat-actuated switch is improved so that the heat exchange relationship with the refrigerant discharged from the compressor is improved. A scroll type hermetically sealed type in which a part of a metal hermetic container is directly and airtightly fixed to the housing of a hermetic compressor and the electric motor controls the electric motor in response to an abnormal temperature exceeding a predetermined temperature. Electric compression Located in.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The hermetic electric compressor of the present invention will be described below with reference to the drawings. FIG. 1 is an example of the hermetic electric compressor of the present invention, and a housing 1 is composed of a cylindrical portion 1A, an upper container 1B, and a lower container 1C. A fixed scroll 3A and a movable scroll 3B of the scroll compressor 2 are installed near the upper part of the housing 1, and the movable scroll 3B is driven by a drive shaft 5 via an eccentric crank 4.
It is connected to the. The drive shaft 5 is connected to the electric motor 6, and its lower end is held by the bearing 7. In this way, the electric motor 6 and the compressor 2 driven by the electric motor 6 are arranged in the rotation axis direction of the electric motor.

The hermetic electric compressor of this embodiment is of a so-called low-pressure housing type, and the inside of the housing 1 is divided by the compressor 2 into a high-pressure part on the discharge side and a low-pressure part on the suction side. A discharge pipe 9 is air-tightly connected to the upper container 1B of the housing 1, and a suction pipe 11 is air-tightly connected to the cylindrical portion 1A of the housing 1 in a suction chamber 10 which is a low pressure side and accommodates an electric motor. There is. The refrigerant guided from the suction pipe 11 to the suction chamber 10 is compressed by the compressor 2 and is sent from the discharge pipe 8 to the cooling unit (not shown) via the discharge chamber 8.

An airtight conductive terminal 12 is airtightly attached to the side surface of the cylindrical portion 1A of the housing 1 by welding or the like to electrically connect the electric motor 6 to a power source (not shown) outside the housing 1. A heat-actuated switch 14 that is airtightly fixed to the terminal fitting 13 by ring projection welding or the like is fixed to the upper container 1B by welding or the like via the terminal fitting 13. At this time, the heat-actuated switch 14 is attached so as to expose the heat-sensitive portion to the discharge chamber 8 and be exposed to the discharge refrigerant so that the heat exchange relationship with the discharge refrigerant is improved.

The heat-actuated switch mounted in this way is
Since the heat exchange relationship with the discharged refrigerant is improved, it is possible to reliably detect the temperature change of the discharged refrigerant. Also, its mounting is easily performed by welding with the housing, and since the conductive terminals are located outside the housing, it controls the energization of the motor as a pilot duty, for example, to the control circuit of a control device such as an electromagnetic relay. Connection becomes easy. It goes without saying that the power source and the electric motor are connected to the contact side circuit of the electromagnetic relay as the control device via the airtight conductive terminal 12.

The heat-actuated switch 14 will be described with reference to FIG. 2. Through holes 21A and 21B are bored in the lid body 21, and conductive pins 22A and 22B are filled with electrically insulating material such as glass or ceramics. It is airtightly fixed by the members 23A and 23B. In the vicinity of the outer periphery of the lid body 21, a bottomed cylindrical metal container 24 is airtightly fixed at its open end by ring projection welding or the like to form a pressure resistant container. A fixed contact plate 25 having a fixed contact portion 25A at its tip is conductively fixed to the inner end of the container of the conductive pin 22A. A movable contact support plate 27 having a movable contact 26 at its tip is biased to the inner end of the conductive pin 22B so as to contact the fixed contact 25A.

At the bottom of the container 24, a thermal deformation such as a bimetal, which is molded into a substantially circular dish shape, is flip-inverted at the first operating temperature, for example, 150 ° C., and is rapidly returned at the second operating temperature, for example, 120 ° C. The heat responsive plate 28 made of material is the holding plate 29.
Is provided so as to come into contact with the bottom surface of the container 24. Transmission piece 3 made of electrically insulating material such as ceramics
0 is fixedly supported by a hole formed in the movable contact support plate 27. At this time, the spring constant and the positional relationship are set so that the restoring force of the holding plate 29 is weaker than that of the movable contact support plate 27, so that the reversing operation of the heat responsive plate 28 is not hindered. In addition to the sufficient holding power, the heat responsive plate 28 is always in a good heat exchange state with the lower surface of the container 24. The contact pressure between the contacts is set to an appropriate value, and is set so that the lower end of the transmission piece 30 does not always come into contact with the heat responsive plate 28.

The operation of the thermally responsive switch 14 will be described. Until the first operating temperature of 150 ° C. is reached, the thermally responsive switch 14 maintains the state shown in FIG. 2 (A). At this time, while the heat responsive plate 28 is curved so as to be convex downward as shown in FIG. 2 (A), it does not come into contact with the transmission piece 30 even if the curvature rate is slightly changed by the temperature thereof. Has been Therefore, the force from the transmission piece 30 is not applied to the movable contact support plate 27 regardless of the change in the curvature rate of the heat responsive plate 28, and the contact pressure between the contacts is kept constant until the reversal.

When the temperature rises and reaches the first operating temperature of 150 ° C., the thermal responsive plate 28 is suddenly reversed by the snap action and becomes a curved state in which it is convex upward as shown in FIG. 2B. Due to this reversal, the heat responsive plate 28 comes into contact with the transmission piece 30 and is pushed up. Therefore, the movable contact support plate 27 is pushed up via the transmission piece 30, and the fixed contact portion 25A and the movable contact 26 are opened. This state is maintained until the temperature decreases and the second operating temperature of 120 ° C. is reached. At this time as well, the thermal responsive plate 28 slightly changes the bending rate with respect to the change in temperature, but the movable contact 26 does not come into contact with the fixed contact portion 25A until the bending direction is restored. When the temperature drops and reaches the second operating temperature of 120 ° C., the thermal responsive plate 28 snaps back by snap action and its bending direction returns to a downward convex state as shown in FIG. 2 (A).

In this heat-actuated switch having the above-mentioned structure, the pressure between the contacts does not decrease until just before it is released, so that the hermetic electric compressor is less likely to cause malfunctions such as chattering due to its vibration. can do.

Further, FIG. 2C shows a normally open type thermal response switch. The same parts as those of the above-mentioned thermal switch 14 are designated by the same reference numerals and detailed description thereof will be omitted. In this heat-actuated switch 14A, the fixed contact 25B and the movable contact 26 are not always in contact with each other, and the electric path between the conductive pins 22A-22B is cut off. The operation is similar to that of the heat-responsive switch 14 described above. When the refrigerant temperature rises to the first operating temperature due to an abnormality in the electric motor or the like, the heat-responsive switch 14A inverts the heat-responsive plate 28 in the fixed-contact 25B. And the movable contact come into contact with each other, and the electric circuit switches from the disconnected state to the connected state. After that, when the temperature drops and reaches the second operating temperature, the fixed contact 25B and the movable contact 26 are separated.

According to the heat-actuated switch 14A having such a structure, for example, the electromagnetic relay or the like is controlled to cut off the power supply to the electric motor or connected to an alarm or the like for issuing an alarm by appropriate light or sound. It is possible to inform and control the abnormality of the hermetic electric compressor.

Further, by using a heat-actuated switch which operates at two or more preset temperatures such as a caution temperature and an emergency temperature, an alarm to call attention due to a rise in the refrigerant temperature is issued and an appropriate method is used when the temperature further rises. Those skilled in the art will readily understand that the electric motor can also be controlled.

The control method of the heat-actuated switch of the hermetic electric compressor will be explained. As shown in the circuit diagram of FIG. 3, the control method drives a relay or an electromagnetic relay by a signal from the heat-actuated switch. Pilot duty system (Fig. 3 (A)) that shuts off the electric circuit from the power source to the electric motor
And a direct cut method (FIG. 3 (B)) in which a direct heat-actuated switch breaks the electric path to the electric motor.

In the pilot duty system of FIG. 3 (A), the heat-actuated switch 14 is provided independently of the electric circuit to the electric motor, and when the electric compressor malfunctions, the heat-actuated switch 14 is provided.
Is input or cut off to the control device 31, and the control device 31 opens the electromagnetic relay 32 provided on the electric path from the power source to the electric motor 33 by the signal, and the electric motor 33
The circuit from the power supply to is cut off. Further, the control device 31 can notify that the temperature of the part to which the heat-actuated switch is attached is abnormal by a signal such as appropriate light or sound, and can appropriately control the electric motor.

In the direct cut system of FIG. 3B, the heat-actuated switch 14 is provided on the electric path between the electric motor 33 and the power source, and the thermo-actuated switch opens the contact between them when the electric compressor is abnormal. Then, the power supply to the electric motor 33 is directly cut off.

In the above-described embodiment, either of the above control methods can be easily achieved by simply changing the wiring between the heat-actuated switch and the electric motor. Also, by installing a heat-actuated switch separately from the airtight conductive terminal, the structure of the airtight conductive terminal is the same whether the energizing circuit to the motor is opened or closed directly or the motor is controlled via another control circuit. The control method can be easily selected. Further, as shown in FIG. 3 (C), a heat-responsive switch 34
It is also possible to use a type in which an auxiliary heater is built in.

Further, FIG. 3D is a circuit diagram of the pilot duty system using the electromagnetic relay 35 in the three-phase electric motor, and FIG. 3E is a heat-actuated switch 36 for three-phase in the three-phase electric motor. Although a circuit diagram of a direct cut system using is shown, it is extremely easy for those skilled in the art to analogize in the same manner as in the case of the single-phase motor in these cases, and therefore the description thereof will be omitted.

Next, another embodiment will be described. In FIGS. 4 and 5, the same parts as those in the above-described example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 4 shows a scroll-type hermetic electric compressor similar to that shown in FIG. 1, and shows a portion above the compressor 2. Inside the upper container 1B of the housing 1 is a discharge chamber 8 for the high-temperature high-pressure discharge refrigerant from the compressor 2, and a discharge pipe 9 is connected to the discharge chamber 8. Also, the upper container 1B
A heat-actuated switch 40 is directly and airtightly fixed to it by welding or the like.

The thermal switch 40 will be described with reference to FIG. In this heat-actuated switch 40, the lid 41 serves as the lid 21 and the terminal fitting 13 used for mounting the heat-actuated switch 14 described above. Through holes are formed in the lid body 41 so that conductive terminal pins 22A and 22B are formed.
Are hermetically fixed by electrically insulating fillers 23A and 23B. The lid 41 is airtightly fixed to the open end of the container 24 by welding or the like to form an airtight pressure resistant container.
The internal structure thereof is the same as that of the above-mentioned heat-actuated switch 14 shown in FIG. 2, and the operation thereof is also the same, so a detailed description thereof will be omitted.

According to the hermetic electric compressor in which a part of the metal container of the heat-actuated switch is directly airtightly attached to the housing as in this embodiment, the number of parts can be reduced in addition to the features of the above-mentioned embodiment. As a result, it is possible to reduce costs and production processes.

Still another embodiment will be described with reference to FIGS. 6 and 7. In FIG. 6, reference numeral 50 is a horizontal scroll-type hermetic electric compressor, which is a so-called high-pressure housing type in which the entire housing serves as a discharge refrigerant passage after compression. The housing 51 is composed of a central portion 51A, a compressor side housing end 51B and an electric motor side housing end 51C. The scroll compressor 52 includes a fixed scroll 52A and a movable scroll 52B, and the movable scroll 52B is the crank 5
It is driven by the electric motor 55 via the motor 3 and the drive shaft 54.
The suction pipe 56 penetrates the housing 51 and is airtightly fixed, and is connected to the fixed scroll 52B and is connected to the compressor 52.
Intake refrigerant is supplied into the inside. The refrigerant compressed by the compressor passes through the housing as shown by the arrow in FIG. 6 and is supplied from the discharge pipe 57 to the refrigeration unit (not shown).

A through hole is provided in the housing 51, and an airtight conductive terminal 58 for electrically connecting the inside and the outside of the housing is airtightly fixed thereto. As shown in FIG. 7, the airtight conductive terminals 58 are made of conductive terminal pins 58A, 58B, 5 made of an electrically insulative filling material such as glass.
8C is airtightly held there. A socket 59 is attached to the tip of the conductive terminal pin inside the housing and is connected to the stator winding of the electric motor, and an external power source (not shown) is connected to the tip outside the housing.

A through hole 58D is bored in the airtight conductive terminal 58, and a thermoresponsive switch 60 is airtightly fixed to the through hole 58D by a part of the metal container such as ring projection welding. Further, the conductive pins 60A and 60B of the heat-actuated switch are connected to a control device of an electric motor such as an electromagnetic relay (not shown).

In the hermetic electric compressor equipped with the heat-actuated switch as described above, the heat-actuated switch can be directly exposed to the discharged refrigerant to obtain a good heat exchange relationship. Can be protected.
Moreover, since the airtight conductive terminal and the heat-actuated switch are integrated, the work of assembling into the housing becomes easy.

Next, another embodiment will be described with reference to FIGS.
Will be described. The above-mentioned hermetic electric compressor 50
The same parts as those of FIG. The hermetic electric compressor 61 is also a high pressure housing type horizontal hermetic electric compressor having a scroll compressor and an electric motor inside the housing 51. In this embodiment, the airtight conductive terminal 62 is airtightly fixed to the through hole formed in the motor-side housing end 51C by welding or the like.

As shown in FIG. 9, conductive terminal pins 62A, 62B and 62C for electrically connecting the outside and the inside of the housing of the electric compressor are hermetically sealed to the airtight conductive terminal 62 by an electrically insulating filling material such as glass. In addition to being held, the electrically conductive pins 63A and 63B of the thermally responsive switch 63 are airtightly held by the electrically insulating filler. And the conductive pin 63
The container 64 is airtightly fixed to the airtight conductive terminal 62 by welding or the like so as to cover A and 63B, thereby forming a closed container of the thermoresponsive switch 63, and the lid of the thermoresponsive switch 63 is made of the metal. And a part of the airtight conductive terminal. Conductive pin 63A
63 and 63B are connected to a control device (not shown) as in the above-described embodiment.

In the hermetic electric compressor to which the heat-actuated switch is attached as in this embodiment, a part of the metal hermetically sealed container of the heat-actuated switch constitutes an airtight conductive terminal. It is possible to further reduce the number of parts and simplify the assembling work as compared with the above.

Still another embodiment will be described with reference to FIGS. 10 and 11. The same parts as those of the hermetic electric compressor 61 described above are designated by the same reference numerals, and detailed description thereof will be omitted. This hermetic electric compressor 71 is a high pressure housing type horizontal scroll hermetic electric compressor of the same type as the hermetic electric compressor 61 described above. The airtight conductive terminal 72 of this embodiment is also the airtight conductive terminal 62 described above.
Similarly to the above, it is configured to be a part of the airtight conductive terminal and at the same time a lid of the thermally responsive switch.

Also in this embodiment, the conductive terminal pins 72A,
72B and 72C are airtightly fixed in a through hole formed in the airtight conductive terminal 72 by an electrically insulating filling material.
Of these, the conductive terminal pins 72A and 72B are directly inserted into the socket 59 to connect the electric motor inside the housing of the electric compressor to the external power source as in the above-mentioned example, but the conductive terminal pin 72C has a bottom so as to cover it. Cylindrical metal container 74
Is hermetically fixed, and the inner end of the conductive terminal pin 72C is located in the closed container of the heat responsive switch 73.

A through hole is bored in the bottom of the metal container 74, and the conductive pin 73A is airtightly fixed by an electrically insulating filling material. The lower end of the conductive pin 73A shown in the figure is inserted into the socket 59 and the electric motor is inserted. Connected to. In the thermal switch 73, the conductive terminal pin 72C and the conductive pin 7
A switch having a normally closed contact is provided between the contact 3A and 3A, and when the temperature rises due to an abnormality of the electric motor or the like, the contact between the contacts is opened and the power supply to the electric motor is directly cut off. That is, FIG. 3 (B)
The control of the direct cut method shown in can be obtained.

According to the hermetic electric compressor equipped with the heat-actuated switch as in this embodiment, it is not necessary to connect the conductive terminal pins or the conductive pins to each other outside the airtight conductive terminal, and the conventional hermetic electric compressor is used. It is possible to easily obtain the protective device for the hermetic electric compressor by using exactly the same wiring as the wiring.

The present invention is particularly suitable for a hermetic electric compressor, such as a scroll compressor or a compressor of this type, which is easily overheated depending on operating conditions.
Further, both the high-voltage housing type and the low-voltage housing type may be installed vertically or horizontally, and the mounting position of the airtight conductive terminal does not limit the mounting position to the housing as long as the conditions described in the claims are satisfied. ..

[0052]

According to the hermetic electric compressor of the present invention, since the mounting structure of the heat-actuated switch has a good heat exchange relationship with the refrigerant, either a high pressure housing type or a low pressure housing type is provided. Even if the temperature of the discharged refrigerant is reliably detected, the electric motor can be controlled by quickly shutting off the power supply to the electric motor or issuing an alarm when the electric motor or compressor is abnormal. .. Further, the attachment is easily performed by welding with the housing, and since the conductive terminals are provided outside the housing, the connection of the electric motor to the control device becomes easy.

Further, the heat-responsive switch provided in the hermetic electric compressor has a structure in which the pressure between the contacts does not decrease until just before the opening, so that even if the device is attached to equipment accompanied by vibration, so-called chattering or the like occurs. Malfunctions can be reduced.

Further, by directly and airtightly fixing a part of the metal closed container of the heat-actuated switch to the housing of the hermetic electric compressor, the number of parts can be reduced and the cost and the production process can be reduced. Can be measured.

Further, by integrating the airtight conductive terminal and the heat-actuated switch, the work of assembling the heat-actuated switch in the housing becomes easy.

Further, since a part of the metal closed container of the heat-actuated switch constitutes the airtight conductive terminal, the number of parts can be further reduced and the assembling work can be simplified.

Further, according to the present invention, it is possible to eliminate the need to connect the conductive terminal pins of the airtight conductive terminal and the conductive pins of the heat-actuated switch outside the housing, and in accordance with the wiring of the conventional hermetic electric compressor. It is possible to easily obtain the hermetic electric compressor having the protective device with the wiring.

[Brief description of drawings]

FIG. 1 is a sectional view of a hermetic electric compressor according to the present invention.

FIG. 2 is a sectional view of an embodiment of a heat-actuated switch attached to the hermetic electric compressor of the present invention.

FIG. 3 is a wiring circuit diagram of the hermetic electric compressor of the present invention.

FIG. 4 is a partial cross-sectional view of another hermetic electric compressor according to the present invention.

FIG. 5 is a cross-sectional view of another embodiment of the heat-actuated switch attached to the hermetic electric compressor of the present invention.

FIG. 6 is a sectional view of another hermetic electric compressor of the present invention.

7 is a partially enlarged sectional view of the hermetic electric compressor shown in FIG.

FIG. 8 is a sectional view of another hermetic electric compressor according to the present invention.

9 is a partially enlarged sectional view of the hermetic electric compressor shown in FIG.

FIG. 10 is a sectional view of another hermetic electric compressor according to the present invention.

11 is a partially enlarged sectional view of the hermetic electric compressor shown in FIG.

FIG. 12 is a cross-sectional view of a hermetic electric compressor equipped with a conventional heat-actuated switch.

[Explanation of symbols]

 1, 51: Housing 2, 52: Compressor 6, 55: Electric motor 8: Discharge chamber 9,57: Discharge pipe 10: Suction chamber 11,56: Suction pipe 12,58: Airtight conductive terminal 13: Terminal fitting 14, 40 , 60, 63, 73: Thermally-actuated switch 21, 41: Lid 62, 72: Airtight conductive terminal

Claims (11)

[Claims] 1. An electric motor and a compressor driven by the electric motor are arranged in a housing in a rotation axis direction, and an intake pipe through which an intake refrigerant flows is provided in an electric motor side housing which is an intake side of the compressor. Is connected to the housing in an airtight manner, the refrigerant sucked from the suction pipe is compressed by a compressor, and the discharge tube is connected to the hole formed in the wall of the housing on the discharge side of the compressor in an airtight manner. An airtight conductive terminal for connecting an external power supply and an electric motor is airtightly attached to a hole formed in an appropriate portion of the wall of the compressor to discharge the housing so that the heat exchange relationship with the refrigerant discharged from the compressor is improved. A hermetically-sealed electric compressor characterized in that a heat-responsive switch is airtightly attached to the side thereof, and the heat-responsive switch controls the electric motor in response to an abnormal temperature exceeding a predetermined temperature. 2. A hermetically sealed metal container of a heat-actuated switch is hermetically fixed to a hole formed in a circular metal terminal plate, and the periphery of the terminal plate is discharged from a housing of a hermetic compressor. The airtight fixing is performed in a hole formed on the side.
The hermetic electric compressor as described in. 3. The heat-actuated switch according to claim 1, wherein a part of the metal hermetic container is directly and airtightly fixed to a hole formed on the discharge side of the housing of the hermetic compressor. Hermetic electric compressor. 4. The hermetic electric compressor according to claim 1, wherein a metal closed container of the heat-actuated switch is directly airtightly fixed to a hole formed in the airtight conductive terminal. 5. The hermetically sealed type according to claim 1, wherein a part of the metal hermetic container of the heat-actuated switch constitutes an airtight conductive terminal for connecting a power source outside the housing and an electric motor inside the housing. Electric compressor. 6. An electric motor and a compressor driven by the electric motor are disposed in a housing in a rotation axis direction, and a suction pipe through which a suction refrigerant flows is airtightly connected to a wall of the housing and sucked from the suction pipe. The refrigerant is compressed by a compressor and discharged into the housing.The discharge pipe is airtightly connected to the hole formed in the wall of the housing, and the hole formed in the wall of the housing serving as the discharge refrigerant passage is connected to the external power source. The airtight conductive terminal for connection with the electric motor is airtightly attached, and the metal closed container of the heat responsive switch is a circular metal terminal plate so that the heat exchange relationship with the refrigerant discharged from the compressor is good. Airtightly fixed to the hole drilled in the housing, the vicinity of the peripheral edge of the terminal plate is airtightly fixed to the hole drilled in the housing on the discharge side of the hermetic compressor, and the predetermined temperature is exceeded by the heat responsive switch. Controls electric motor in response to abnormal temperature A hermetically-sealed electric compressor that is characterized in that 7. An electric motor and a compressor driven by the electric motor are arranged in a housing in a rotation axis direction, and a suction pipe through which a suction refrigerant flows is airtightly connected to a wall of the housing and sucked from the suction pipe. The refrigerant is compressed by a compressor and discharged into the housing.The discharge pipe is airtightly connected to the hole formed in the wall of the housing, and the hole formed in the wall of the housing serving as the discharge refrigerant passage is connected to the external power source. An airtight conductive terminal for connection with the electric motor is airtightly attached, and a metal hole of the heat-actuated switch is provided in the hole formed in the airtight conductive terminal so that the heat exchange relationship with the refrigerant discharged from the compressor is improved. A hermetically sealed electric compressor, wherein a hermetically sealed container is directly airtightly fixed, and the heat-responsive switch controls the electric motor in response to an abnormal temperature exceeding a predetermined temperature. 8. An electric motor and a compressor driven by the electric motor are arranged in a housing in a rotation axis direction, and a suction pipe through which a suction refrigerant flows is airtightly connected to a wall of the housing and sucked from the suction pipe. The refrigerant is compressed by a compressor and discharged into the housing.The discharge pipe is airtightly connected to the hole formed in the wall of the housing, and the hole formed in the wall of the housing serving as the discharge refrigerant passage is connected to the external power source. An airtight conductive terminal for connecting with an electric motor is airtightly attached, and a part of the metal closed container of the heat-actuated switch constitutes the airtight conductive terminal, and the heat-actuated switch causes abnormal temperature exceeding a predetermined temperature. A hermetic electric compressor characterized by controlling the electric motor in response to temperature. 9. A heat-deformable material, such as a bimetal, which is formed into a substantially circular dish shape and is adapted to perform a sudden reversal operation at a first operating temperature and a sudden recovery at a second operating temperature, and a movable contact. A movable contact plate that gives a biasing force so as to come into contact with a fixed contact; and a movable contact plate that is driven by the reversing operation of the heat-deformable material and has excellent vibration resistance. The hermetic electric compressor according to any one of claims 1 to 8, characterized in that. 10. The hermetic electric compressor according to claim 1, wherein the compressor is a scroll compressor. 11. An electric motor and a compressor driven by the electric motor are arranged in a housing in a rotation axis direction, and a suction pipe through which a suction refrigerant flows into the compressor is hermetically connected to a wall of the housing. The refrigerant sucked from the compressor is compressed by the compressor and discharged into the housing.The discharge pipe is airtightly connected to the hole formed in the wall of the housing, and the discharge hole is formed in the hole formed in the wall of the housing. An airtight conductive terminal for connecting the external power supply and the electric motor is attached airtightly, and a part of the metal sealed container of the heat-actuated switch is sealed so that the heat exchange relationship with the refrigerant discharged from the compressor is improved. A hermetically sealed scroll-type electric compressor, characterized in that it is directly airtightly fixed to a housing of a compact compressor, and the heat-responsive switch controls the electric motor in response to an abnormal temperature exceeding a predetermined temperature.