JP2003083258A - Hermetic type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic type compressor which surely prevents abnormal rise of a coil temperature of the hermitic type compressor using a DC blushless motor having a stator in a concentrated winding method and improves reliability, in a hermetic type motor-driven compressor in which a compressing element portion for compressing coolant and the DC blushless motor are incorporated in the same hermetic container. SOLUTION: This hermetic type compressor comprises the compressing element A for compressing the coolant, a motor-driven element B for driving the compressing element are incorporated in the same hermetic container 1. As the motor-driven elements, the DC blushless motor having a stator coil 3 in the concentrated winding method in which respective windings are wound individually on a plurality of tooth portions is used. A temperature detecting means 7 mounted on the stator coil, a control device 22 for controlling the DC blushless motor depending on a result of detection of the temperature detecting device are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used in a refrigerating cycle such as a refrigerator or an air conditioner, and in particular, a stator of an electric element for driving the compressor is a concentrated winding type. The present invention relates to the protection of the stator coil in the case of the DC brushless motor.

[0002]

11 to 15 are views for explaining a main part of a conventional hermetic compressor, and FIG. 11 is a sectional view showing a main part of a hermetic compressor using a concentrated winding type electric motor, 12 shows a stator of the concentrated winding type electric motor of FIG.
FIG. 12A is an enlarged partial plan view showing a part of the stator, and FIG. 12B is a side sectional view of the stator. 13 is a cross-sectional view showing a main part of a hermetic compressor using a distributed winding type electric motor, FIG. 14 shows a stator of the distributed winding type electric motor of FIG. 13, and FIG. A partial plan view showing a part of the stator is enlarged, and FIG. 14B is a side sectional view of the stator. FIG. 15 is a circuit diagram schematically showing an example of a control device in these conventional hermetic compressors.

In the figure, reference numeral 1 is a closed container in which an electric element A composed of a DC brushless motor and a compression element B driven by the electric element A are integrally housed. 11 and 12 are the concentrated winding method,
13 and 14 respectively show the distributed winding method, and are basically the same as each other except that the structure of the stator coil 3 (hereinafter, simply referred to as “coil”) is different due to the difference in the winding method. Throughout the drawings, the same or corresponding parts will be denoted by the same reference symbols and redundant description will be omitted.

The electric element A is a cylindrical stator 30 composed of a stator core 2 having a tooth portion 2c and a coil 3 wound around the tooth portion 2c, and a ferrite disposed in the central portion of the stator 30. Multi-pole permanent magnet 4 using magnets
The rotor 4 has a, and the rotating shaft 5 forming the axis of the rotor 4 and the like. In addition, 2d is an insulator which is arranged so as to cover the inner wall of the slot 2a formed by the adjacent tooth portions 2c and 2c and insulates the stator core 2 from the coil 3, and 3a is a coil end of a concentrated winding method. Parts 3b are coil ends of the distributed winding method. The distributed winding type coil end portion 3b is, as shown in FIG.
The windings are sequentially wound between the distant slots with their phases shifted in the rotation direction, and the ends of the coils intersect each other outside the slots. Therefore, the windings are axially extended in comparison with the coil ends 3a of the concentrated winding method. It is formed so as to largely project.

The compression element B driven by the rotating shaft 5 of the electric element A is rotatably provided on a cylinder 6a fixed inside the closed container 1 and an eccentric portion formed on the rotating shaft 5. A rolling piston 6b that eccentrically rotates in the cylinder 6a together with the eccentric portion of the rotary shaft 5, a vane 6c that is slidably inserted into the cylinder 6a and separates a compression chamber and a suction chamber, and a refrigerant to be compressed. A suction pipe 8 for introducing the refrigerant, a discharge hole 9 for discharging the compressed refrigerant, a discharge valve 10 for opening and closing the discharge hole 9, and a pressure pulsation of the discharged high-temperature and high-pressure refrigerant gas to reduce noise. The discharge muffler 11 includes a discharge hole 11a of the discharge muffler 11 and the like.

3c is a lead wire of the coil 3 and 2
Reference numeral 0 denotes a frame body provided inside the closed container 1 for accommodating a terminal (not shown) attached to the tip portion of the lead wire 3c, 12
Is a sealed terminal fixed to the sealed container 1, and 12a is a conductive pin terminal of the sealed terminal 12 electrically connected to the terminal of the frame body 20. Reference numeral 13 denotes a discharge pipe that projects above the closed container 1 and discharges a high-temperature high-pressure refrigerant gas to the outside of the closed container 1.
Reference numeral 4 denotes a shell temperature detecting thermistor for detecting the temperature of the closed container 1, and 14a denotes the shell temperature detecting thermistor 14.
The lead wire 14a is electrically connected to the controller 22d of the DC brushless motor drive circuit 22 as the controller shown in FIG.

As shown in the circuit diagram of FIG. 15, the DC brushless motor drive circuit 22 has a rectifier 22a for converting an alternating current supplied from a commercial power source into a direct current, and a position detecting circuit 22b for detecting the rotational phase of the rotor 4. A control unit 22d that controls the rotation of the electric element A by controlling the inverter 22c so as to sequentially switch the energization of the coil 3 based on the position detection information obtained by the position detection circuit 22b to form the rotating magnetic field. And so on.

Next, the operation will be described. Power is supplied to the coil 3 via the sealed terminal 12 from the DC brushless motor drive circuit 22 that sequentially switches the phases of the coil 3 of the stator 30 to be energized based on the position detection information obtained by the position detection circuit 22b. Then, the rotor 4 continuously rotates, the power is transmitted to the compression element B via the rotary shaft 5, and the refrigerant gas introduced from the suction pipe 8 eccentrically rotates in the cylinder 6a and the rolling piston 6b. , Is compressed by the vane 6c that separates the compression chamber and the suction chamber,
When the discharge valve 10 is opened, high-temperature high-pressure refrigerant gas is discharged from the discharge hole 9 and discharged. The discharged high-temperature and high-pressure refrigerant gas is discharged into the closed container 1 through the discharge hole 11a while attenuating the pressure pulsation in the discharge muffler 11, and the gap between the stator 30 and the rotor 4 and the stator 30 And closed container 1
It is discharged from the discharge pipe 13 to the outside of the closed container 1 while cooling the coil 3 through a gap (not shown in detail) between and.

In such a compressor, when the temperature of the coil 3 rises during overload operation or the like, the shell temperature detecting thermistor 14 provided in the upper part of the closed container 1 indirectly serves to prevent the coil from burning. Detect the temperature of 3,
When the temperature exceeds the reference temperature, the DC brushless motor is stopped from being energized, the rotation speed of the DC brushless motor is reduced, and the discharge temperature is lowered to protect the coil 3 from abnormal temperature rise.

[0010]

However, the following problems exist in the above structure. In recent years, in order to improve motor efficiency, a concentrated winding type motor having high motor efficiency has been mounted in addition to a conventional distributed winding type motor. In the case of the concentrated winding type stator, as shown in FIG. 12, the coil 3 is directly wound around the tooth portion 2c via the insulator 2d, so that the circumferential length of the coil 3 is shortened and the coil end portion 3a is reduced. Is smaller than about half of the distributed winding type coil end 3b shown in FIG. 14, copper loss is reduced, and motor efficiency is improved. However, the shell temperature detecting thermistor 1 installed outside the closed container 1
4 and the coil end 3a are not only longer, but the surface area of the coil end 3a is smaller and the amount of heat generated from the coil end 3a is also smaller, so that the heat transfer to the closed container 1 is smaller and the shell is smaller. Detection of an abnormal temperature rise by the temperature detection thermistor 14 is delayed, and as a result, the temperature of the coil 3 exceeds the reference value, the life of the DC brushless motor is significantly reduced, and the coil 3 may be burned.

On the other hand, for example, in Japanese Unexamined Patent Publication No. 7-180687, an induction motor having a distributed winding type stator is used as an electric element, and a thermistor is wound around the winding end of the stator to detect the temperature of the coil. However, since the thermistor is originally provided on the end of the coil of the large distributed winding method, the size in the axial direction becomes bulky and the sealed container becomes large, which is not suitable for downsizing. It was Further, the distributed winding type electric motor has a problem that the mounting position of the thermistor or the like is restricted due to the following characteristics.

That is, in order to install the thermistor, for example, on the lower side of the stator 30, that is, at the lower coil end of FIG. It must be guided from the side to the upper side where the sealed terminal 12 is provided.
14 (a), there was not enough space for the lead wire of the thermistor, and in the hermetic compressor, the inside of the hermetic container 1 and the outer periphery of the core of the stator 30 were There is a gap (not shown) through which the refrigerant gas passes, and it is possible to pass the lead wire of the thermistor through this gap, but the stator 30 and the hermetically sealed container 1
Is generally fixed by shrinkage fitting, and when the lead wire of the thermistor comes into contact with the sealed container 1 that has become hot during the manufacturing process, the insulating coating of the lead wire may melt and cause insulation failure. Etc.

The present invention has been made in order to solve the problems of the prior art as described above, and ensures an abnormal coil temperature rise in a hermetic compressor using a DC brushless motor having a concentrated winding type stator. It is an object of the present invention to provide a hermetic compressor that prevents the above and improves reliability.

[0014]

The hermetic compressor of the present invention is a hermetic compressor in which a compression element for compressing a refrigerant and an electric element for driving the compression element are housed in the same hermetic container. A DC brushless motor having a concentrated winding type stator coil in which windings are individually wound around a plurality of teeth portions is used as an electric element, and a temperature detecting means attached to the stator coil and the temperature detecting means are provided. And a control device that controls the DC brushless motor according to the detection result of 1.

Further, a thermistor or a thermostat is used as the temperature detecting means.

Further, a discharge temperature detecting thermistor is attached to the discharge pipe of the compressed refrigerant projecting outside the closed container, and the detection result by the temperature detecting means attached to the stator coil and the detection result by the discharge temperature detecting thermistor. The DC brushless motor is controlled accordingly.

Further, the temperature detecting means is attached to the end of the stator coil facing the compression element.

Further, the temperature detecting means is provided so as to be in contact with both coils wound around the adjacent tooth portions.

The lead wire of the temperature detecting means is
After being inserted between both coils wound around the adjacent tooth portions, it is led out to the outside of the closed container.

The DC brushless motor is characterized in that a permanent magnet made of a rare earth magnet is used for its rotor.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIGS. 1 and 2 show the essential parts of a hermetic compressor according to a first embodiment of the present invention. FIG. 2 is a circuit diagram schematically showing a control circuit. In the figure, reference numeral 1 denotes a closed container, which houses an electric element A and a compression element B. The electric element A includes a rotor 30 using a concentrated winding type stator 30 and a ferrite magnet as the permanent magnet 4a.
And a DC brushless motor including a rotating shaft 5 and the like forming the axis of the rotor 4.

Reference numeral 7 denotes a thermistor as a temperature detecting means for directly detecting the coil temperature of the concentrated winding method, which is directly fixed on the coil end portion 3a of the stator coil 3 by a fixing means 15 made of a binding thread. At the tip of the lead wire 7a of the thermistor 7, terminals (not shown) are attached by the number of the lead wires 7a, and are housed and held in the frame body 21 fixed above the inside of the closed container 1. The lead wire 7a is electrically connected to the conductive pin terminal 16a that constitutes the sealed terminal 16 provided on the upper portion of the sealed container 1, and is electrically connected to the control unit 22d of the DC brushless motor drive circuit 22 shown in FIG. It is connected to the. In addition,
Reference numeral 3c denotes a plurality of lead wires for supplying electric power to the coil 3 (a part thereof is not shown), and terminals (not shown) corresponding to the number of the lead wires 3c are attached to the tip end of the lead wire 3c. It is held by the frame body 20 attached to. The terminal of the lead wire 3c is electrically connected to the conductive pin terminal 12a of the sealed terminal 12 fixed to the sealed container 1, and the inverter 22c and the position detection circuit 22b of the DC brushless motor drive circuit 22 shown in FIG. Electrically connected to.

The compression element B is a cylinder 6a fixed to the closed container 1, a rotary shaft 5 common to the electric element A having an eccentric portion 5a, and the eccentric portion 5a rotatably provided on the cylinder 6a. It comprises a rolling piston 6b which eccentrically rotates together with the eccentric portion of the rotary shaft 5 inside 6a, and a vane 6c which is slidably inserted into the cylinder 6a and partitions the compression chamber and the suction chamber. In addition, 8 is a suction pipe for introducing the compressed refrigerant, 9 is a discharge hole for discharging the compressed refrigerant,
Reference numeral 10 is a discharge valve that opens and closes the discharge hole 9, 11 is a discharge muffler that attenuates pressure pulsation of the discharged high-temperature high-pressure refrigerant gas to reduce noise, 11a is a discharge hole of the discharge muffler 11, and 13 is a closed container. 1 is a discharge pipe that is provided in the upper part of 1 and discharges high-temperature and high-pressure refrigerant gas compressed by the compression element B to the outside of the closed container 1.

Reference numeral 22 shown in FIG. 2 denotes a DC brushless motor drive circuit as a control device, which converts an alternating current supplied from a commercial power source into a direct current and constitutes a direct current (DC) power source, that is, a rectifier 22a and a rotor 4. A position detection circuit 22b for detecting the rotation phase, and the inverter 22c is driven so as to form a rotating magnetic field by sequentially switching the energization of the coil 3 of the stator 30 based on the position detection information obtained by the position detection circuit 22b. Accordingly, the control unit 22d that controls the rotation of the electric element A is provided. Note that the same or corresponding parts are denoted by the same reference symbols throughout the drawings, and description thereof will be omitted.

In the hermetic compressor constructed as described above, when the DC brushless motor drive circuit 22 supplies power to the stator 30 through the hermetically sealed terminal 12 during normal compressor operation, the rotor 4 is rotated. Rotates, power is transmitted to the compression element B via the rotary shaft 5, and the refrigerant introduced from the suction pipe 8 eccentrically rotates in the cylinder 6a and the rolling piston 6b that separates the compression chamber from the suction chamber. The refrigerant gas is compressed by 6c, and the discharge valve 10 is opened to discharge the high-temperature and high-pressure refrigerant gas from the discharge hole 9. The discharged high-temperature and high-pressure refrigerant gas is discharged from the discharge hole 11a to the inside of the closed container 1 while attenuating the pressure pulsation in the discharge muffler 11, and the gap between the stator 30 and the rotor 4 and the outer periphery of the stator 30. While cooling the coil 3 of the stator 30 through the gap in the inner circumference of the closed container 1, the closed pipe 1 is discharged from the discharge pipe 13
Is discharged to the outside.

At this time, in normal operation, the discharge temperature or the temperature difference between the upper portion of the closed container 1 and the coil 3 is 5 to 10.
Although the temperature is within ℃, during the overload operation or the operation with a large compression ratio, the gas circulation amount is extremely reduced, and the coil 3 is insufficiently cooled by the discharge gas. The difference between the temperature of the upper portion of the container 1 and the temperature of the coil 3 may be 20 ° C. or more. Further, since the concentrated winding method is used, the distance between the upper portion of the closed container 1 and the coil end 3a is long, and the surface area of the coil end 3a is small, so that heat transfer from the coil end 3a to the closed container 1 is achieved. Although it is extremely reduced, even in this case, since the thermistor 7 is additionally provided on the coil 3, the temperature of the coil 3 is directly and surely detected, and the DC as the control device shown in FIG.
The brushless motor drive circuit 22 protects the electric element A by stopping the energization to the electric element A composed of the DC brushless motor when the temperature becomes higher than the reference, or by controlling the rotation speed to lower the discharge temperature. can do.

As described above, according to the first embodiment of the present invention, the stator 30 is provided with the concentrated winding coil 3D.
In the hermetic compressor using the C brushless motor as the electric element A, the thermistor 7 for detecting the temperature of the stator coil 3 is installed in close contact with the coil end portion 3a, so that the temperature of the coil 3 is directly measured. By reliably detecting and stopping the rotation of the electric element A or reducing the number of rotations by the control unit 22d based on the detected information, the life of the coil 3 is extended and a highly reliable hermetic compressor is provided. It becomes possible to provide. Further, since the coil end portion 3a is small in size due to the concentrated winding method, it is possible to reduce the size of the closed container even if the temperature detecting means 7 is attached thereto.

Embodiment 2. FIG. 3 is a sectional view showing a main part of a hermetic compressor according to a second embodiment of the present invention. In the figure, a thermistor 7 as a temperature detecting means is attached to the lower side of the stator 30, that is, to the coil end portion 3d facing the compression element B in close contact with the fixing means 15 made of a binding thread. The lead wire 7a of the thermistor 7 is inserted between two adjacent coils in the slot of the stator 30 and guided to the upper part of the stator 30, and is electrically connected to the conductive pin terminal 16a constituting the sealed terminal 16. Is configured.

Next, the insertion of the lead wire 7a of the thermistor 7 will be described. FIG. 4 is a partial cross-sectional plan view for explaining the external shape when the stator core 2 is an integral core, and FIG. 5 is a split core when concentrated winding windings are applied. Note that FIG. 5A is a cross-sectional view for explaining the situation when winding the individual split cores, and FIG. 5B is a partial cross-sectional plan view showing the integrated state. In the figure, 1
Reference numeral 8 is a claw at the tip of the winding machine, V is a gap between adjacent coils, and black arrow C is a fixed portion of the split core. As shown in FIG. 4, when an integral core is used as the stator core 2, when the winding is applied to the teeth portion 2c, the claw 18 of the winding machine is used.
Since a space for entering is required, a predetermined space is required between the adjacent coils 3 and the gap V is formed even after the coil is formed.
The lead wire 7a of the thermistor 7 can be easily inserted into the.

On the other hand, when a split core is used as the stator core 2, the coil 3 is connected to the tooth portion 2 as shown in FIG.
When wound around c, as shown in FIG. 5 (a), other adjacent coils and the claw 18 of the winding machine can be independently wound without interfering with each other, so that a space for the claw 18 to enter is not necessary. Also in this case, when the split cores are connected and integrated as shown in FIG. 5B, the coil 3 wound around the tooth portion 2c is formed.
So as not to interfere with each other, the coil 3 is wound so that a gap V is formed between adjacent coils.
Can be used as a space for inserting the lead wire 7a of the thermistor 7.

The other reference numerals are the same as those in the first embodiment, and the control circuit for protecting the electric element A is also shown in FIG.
The description is omitted because it is similar to the above.

During normal compressor operation, the discharge temperature of the high-temperature high-pressure gas in the closed container 1 is 5 to 10 ° C. with respect to the temperature of the coil 3 of the stator 30, as described in the first embodiment.
Although it is possible to cool the coil 3 at a relatively low temperature, the refrigerant gas just discharged from the discharge hole 9 is higher than the discharge temperature by about 5 to 10 ° C., so that the compressed refrigerant gas is discharged. From the discharge hole 11a of 11 to the closed container 1
In the portion directly hitting the end portion of the coil 3 when discharged into the inside, the cooling of the coil 3 may be insufficient and the temperature may locally exceed the reference value. In that case, the coil 3 is easily damaged. However, there is a fear that the life of the electric element A is significantly reduced. However, according to the second embodiment, by installing the thermistor 7 on the compression element A side, particularly in the coil end portion 3d near the discharge hole 11a of the discharge muffler 11, the coil temperature of the portion where the temperature locally rises. Can be reliably detected, the life of the electric element can be extended, and a highly reliable hermetic compressor can be provided.

As described above, according to the second embodiment, the electric element A composed of the DC brushless motor having the concentrated winding type stator 30 is used, and the thermistor 7 is provided below the stator 30, that is, the compression element. Since it is installed at the coil end 3d facing B, it is possible to easily and surely detect the coil temperature of the part where the temperature locally rises, extend the life of the electric element, and have high reliability. It becomes possible to provide a hermetic compressor. Further, the lead wire 7a of the thermistor 7 can be easily guided upward by inserting the gap V between the coils, and there is no problem in mounting.

Embodiment 3. FIG. 6 shows a main part of a hermetic compressor according to a third embodiment of the present invention,
(A) is a side sectional view, and (b) is an enlarged plan view of an essential part showing the configuration of a portion provided with a thermistor. In the figure,
The thermistor 7 as a temperature detecting means is installed in the gap V in the slot 2a of the stator 30 so as to come into contact with both the coils 3 and 3 wound around the tooth portion 2c via the insulator 2d. The lead wire 7a is the thermistor 7
The gap V between the adjacent coils 3 in the same slot 2a is inserted and guided to the upper part of the stator 30, and the end is electrically connected to the conductive pin terminal 16a forming the sealed terminal 16. Is configured. The other structure including the control device is the same as that of the first embodiment, and therefore the description thereof is omitted.

In the third embodiment configured as described above, since the thermistor 7 is fixed so as to be sandwiched by the coils 3 and 3, which are adjacent to each other, the thermistor is the same as in the first and second embodiments. There is an effect that it is not necessary to fix 7 itself with a fixing means such as a binding thread, the number of parts and the processing steps can be reduced, and the manufacturing is easy. The gap V between the adjacent coils and the thermistor 7
In order to make the contact between the coil 3 and the thermistor 7 due to the variation in the diameter of the thermistor 7 substantially uniform, the thermistor 7 is fixed by, for example, a thermosetting resin, or an insulating thin material 71 having plasticity or elasticity and thermal conductivity is provided. It is also possible to interpose, for example, between the thermistor 7 and the coil 3.

Fourth Embodiment 7 is a side sectional view showing a main part of a hermetic compressor according to a fourth embodiment of the present invention. In the figure, the thermistor 7 as the temperature detecting means of the coil 3 is inserted with the opposite lead wire side from the bottom of the stator 30 to the top (that is, from the bottom to the top of the figure), and the lead wire 7a of the thermistor 7 is fixed. After being guided to the upper part of the stator 30 through the gap between the coils 3 in the same or another slot so as to be folded back to the upper side of the child 30,
It is electrically connected to the conductive pin terminal 16 a that constitutes the sealed terminal 16. The other configurations are the same as those in the first embodiment.

The vertical position of the thermistor 7 is, as described in the second embodiment, the lower part of the stator 30, that is, the compression element side, so that the coil 3 can be protected preferably. When the stator core 2 is a split core as shown in FIG. 5, when the split cores are connected and integrated, the thermistor 7 is sandwiched between adjacent coils in advance so that the vertical direction (that is, It can be attached at any position in the axial direction of the rotary shaft 5. However, when the thermistor 7 is inserted between two adjacent coils, such as when the stator core 2 is an integral core as illustrated in FIG. 4, the upper end portion of the stator 30 or the Although one of the lower ends is the preferred position, in the fourth embodiment, the thermistor is inserted from the bottom to the top of the stator 30 and the lead wire 7a is folded back 180 ° above the stator 30 to form the same position. Alternatively, it is easily attached by passing a gap between coils in another slot.

As described above, according to the fourth embodiment, even when the stator core 2 is an integral core, the thermistor 7 is provided on the side of the compression element B without separately using a fixing means such as a binding thread. Therefore, the effect that the coil 3 of the electric element A can be easily protected is obtained.

Embodiment 5. 8 is a side sectional view showing a main part of a hermetic compressor according to a fifth embodiment of the present invention. In the figure, 4a is neodymium, ferrite, iron,
It is a permanent magnet made of a rare earth magnet containing boron and the like. The other configuration is similar to that of the first embodiment.

When a rare earth magnet is used as the permanent magnet 4a, a stronger magnetic force can be obtained as compared with the case of a ferrite magnet, so that the stacking height H of the stator core 2 is reduced and the motor Although it is possible to further reduce the volume and the amount of copper wire used, on the other hand, the same sealed container 1 as when a ferrite magnet is used for the permanent magnet 4a of the rotor 4 is used especially for common parts. When used, since the stacking height H of the stator core 2 is reduced, the distance between the upper portion of the closed container 1 and the coil end portion 3a becomes longer.
Although heat transfer from a to the closed container 1 is further reduced, since the thermistor 7 is directly attached to the coil end 3a,
The temperature of the coil 3 is reliably detected regardless of the distance, and when the temperature exceeds the reference, the DC brushless motor is de-energized or the DC brushless motor rotation speed is reduced to lower the discharge temperature through the control circuit. Therefore, there is an effect that the life of the electric element can be extended and a highly reliable hermetic compressor can be provided. The mounting position of the thermistor 7 in the axial direction may be provided not on the upper coil end portion 3a but on the compression element side, for example.

Sixth Embodiment 9 and 10 illustrate a hermetic compressor according to a sixth embodiment. FIG. 9 is a side sectional view showing an essential part of the hermetic compressor, and FIG. 10 is a circuit diagram schematically showing its control circuit. Is. In the figure, reference numeral 17 is a thermostat composed of a bimetal element as a temperature detecting means, and like the thermistor 7 in the first embodiment, a fixing means 15 composed of a binding thread is provided on the coil end 3a above the concentrated winding coil 3. It is attached closely. 17a is a lead wire of this thermostat 17, 19
Is a discharge temperature detecting thermistor fixed on the outer surface of the discharge pipe 13. Lead wire 17a of the thermostat 17,
The lead wire of the discharge temperature detection thermistor 19 is electrically connected to the controller 22d of the DC brushless motor drive circuit 22 as a controller.

Next, the operation will be described. In the hermetic compressor configured as described above, when the temperature of the coil 3 exceeds the reference value during overload operation or the like, the thermostat 17 provided at the coil end 3a operates and the control circuit of FIG. When the discharge temperature detection thermistor 19 installed on the discharge pipe 13 stops the energization of the electric element A composed of the DC brushless motor, and the discharge temperature becomes equal to or higher than the reference value, the DC brushless motor is generated according to the discharge temperature. The power supply to the coil 3 is stopped, the rotation speed of the DC brushless motor is reduced, and the discharge temperature is lowered to protect the coil 3 from abnormal temperature rise.

As described above, in the hermetic compressor according to the sixth embodiment, the discharge temperature detecting thermistor 19 performs temperature control such as adjusting or stopping the rotation speed of the electric element A, and the coil end portion. Since the thermostat 17 installed in 3a can be operated as the final means for reliably lowering the coil temperature to the reference value or less, there is an effect that it is possible to provide a hermetic compressor with a finer grain and higher reliability. The configuration using the same thermostat and discharge temperature detection thermistor as in this embodiment can be similarly applied to, for example, the second to fifth embodiments.

By the way, the present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the sealed terminal is a sealed terminal 16 for a thermistor or thermostat, and a DC brushless motor. Although the sealed terminal 12 for the lead wire 3c for supplying electric power to the above is separately configured, it may be appropriately modified within a range not departing from the gist such as making each conductive pin terminal the same sealed terminal. Further, the control method is not limited to the one exemplified in the above-mentioned embodiment, and well-known control techniques can be appropriately selected and applied individually or in combination.

[0045]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, since the temperature detecting means is attached to the stator coil of the DC brushless motor using the concentrated winding type stator, there is a restriction on the attachment position of the temperature detecting means. Since the abnormal temperature rise of the coil can be detected directly without fail, it is possible to reliably prevent the motor from burning and provide a highly reliable hermetic compressor.

According to the second aspect of the invention, since the thermistor or the thermostat is used as the temperature detecting means, it is possible to easily detect the abnormal temperature rise of the coil with a simple structure.

According to the third aspect of the present invention, a discharge temperature detecting thermistor is attached to the discharge pipe of the compressed refrigerant projecting outside the closed container, and the detection result by the temperature detecting means attached to the stator coil is displayed. Since the electric element is controlled according to the detection result of the discharge temperature detection thermistor, finer control can be performed.

According to the invention as set forth in claim 4, since the temperature detecting means is arranged at the end of the coil facing the compression element, the coil temperature of the portion directly contacted with the high temperature and high pressure refrigerant gas is surely secured. Since it can be detected, it is possible to provide a highly reliable hermetic compressor without damaging the coil.

According to the fifth aspect of the invention, the temperature detecting means is attached so as to be in contact with both coils wound around the adjacent tooth portions, so that the temperature detecting means is fixed with a binding thread or the like. Since it is not necessary and the number of parts can be reduced, it is possible to provide an inexpensive and highly reliable hermetic compressor.

According to the sixth aspect of the present invention, the lead wire of the temperature detecting means is led out to the outside of the closed container after passing between both coils wound around the adjacent tooth portions. Therefore, it is possible to provide a highly reliable hermetic compressor in which the temperature detecting means is easily attached and which is easy to manufacture.

According to the invention of claim 7, since the rare earth magnet is used as the permanent magnet of the rotor, the stacking height of the stator core is small, and the abnormal temperature rise of the coil can be reliably detected. It is possible to prevent the motor from burning,
It is possible to provide a highly reliable hermetic compressor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a compressor body of a hermetic compressor according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram schematically showing a control circuit of the hermetic compressor according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a hermetic compressor according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional plan view illustrating the shape of a winding when a concentrated winding winding is applied to a stator core having an integral core.

FIG. 5 is a partial cross-sectional plan view for explaining the shape of the winding when the concentrated winding type winding is applied to the stator core of the split core.

FIG. 6 is a sectional view showing a main part of a hermetic compressor according to a third embodiment of the present invention.

FIG. 7 is a side sectional view showing a main part of a hermetic compressor according to a fourth embodiment of the present invention.

FIG. 8 is a side sectional view showing a main part of a hermetic compressor according to a fifth embodiment of the present invention.

FIG. 9 is a side sectional view showing a main part of a hermetic compressor according to a sixth embodiment of the present invention.

FIG. 10 is a circuit diagram schematically showing a control circuit of a hermetic compressor according to a sixth embodiment.

FIG. 11 is a cross-sectional view showing a main part of a hermetic compressor using a conventional concentrated winding type electric motor.

12 is an enlarged view showing a part of the electric motor stator shown in FIG.

FIG. 13 is a cross-sectional view showing a main part of a hermetic compressor using a conventional distributed winding type electric motor.

14 is an enlarged view showing a part of the electric motor stator shown in FIG.

FIG. 15 is a circuit diagram schematically showing an example of an electric motor protection device in a conventional hermetic compressor.

[Explanation of symbols]

1 closed container, 2 stator core, 2a slot,
2c teeth portion, 2d insulator, 3 stator coil (coil), 3a coil end portion (concentrated winding method), 3b
Coil end (distributed winding method), 3c lead wire, 3d Coil end (compression element side, concentrated winding method), 4 rotor,
4a permanent magnet, 5 rotating shaft, 5a eccentric part, 6a
Cylinder, 6b rolling piston, 6c vane, 7 temperature detection means (thermistor), 7a lead wire, 8 suction pipe, 9 discharge hole, 10 discharge valve, 11
Discharge muffler, 11a discharge hole, 12 sealed terminals,
12a conductive pin terminal, 13 discharge pipe, 14 shell temperature detecting thermistor, 14a lead wire, 15 fixing means (binding thread), 16 sealing terminal, 16a conductive pin terminal, 17 temperature detecting means (thermostat), 18 claw of winding machine , 19 Discharge temperature detection thermistor, 20, 21
Frame, 22 Control device (DC brushless motor drive circuit), 22a Rectifier, 22b Position detection circuit, 22c
Inverter, 22d control part, 30 stator, 71
Insulating thin leaf material, A electric element, B compression element, C fixing part, V gap, H stack height,

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F04C 18/356 F04C 18/356 Z 5H611 29/00 29/00 TU 29/10 311 29/10 311C 331 331A 331B H02K 11/00 H02K 29/00 Z 29/00 11/00 E H02P 6/16 H02P 6/02 351N F term (reference) 3H003 AA05 AB04 AC03 AD01 CF01 3H029 AA04 AA13 AB03 BB11 BB50 CC07 CC27 CC38 CC56 CC61 CC62 CC65 3H045 AA05 AA09 AA12 AA27 BA42 BA43 CA19 DA02 DA04 DA05 EA16 EA26 EA34 EA50 5H019 BB01 CC03 DD01 FF00 FF01 5H560 AA02 BB12 DA13 DC05 EB01 JJ06 RR06Q03 Q02Q02 Q03

Claims (7)

[Claims] 1. A hermetic compressor in which a compression element for compressing a refrigerant and an electric element for driving the compression element are housed in the same hermetic container, and the electric elements are individually wound around a plurality of teeth portions. A DC brushless motor having a concentrated winding type stator coil in which a wire is wound is used, and the DC brushless motor is controlled according to the temperature detection means attached to the stator coil and the detection result of the temperature detection means. A hermetic compressor comprising a control device. 2. The hermetic compressor according to claim 1, wherein a thermistor or a thermostat is used as the temperature detecting means. 3. A discharge temperature detecting thermistor is attached to a discharge pipe of compressed refrigerant projecting outside the hermetic container, and the detection result by the temperature detecting means attached to the stator coil and the detection result by the discharge temperature detecting thermistor. 3. The hermetic compressor according to claim 1, wherein the DC brushless motor is controlled in accordance with the above. 4. The hermetic compressor according to claim 1, wherein the temperature detecting means is attached to an end of the stator coil facing the compression element. 5. The sealed type according to claim 1, wherein the temperature detecting means is attached so as to be in contact with both coils wound around the adjacent tooth portions. Compressor. 6. The temperature detecting means is characterized in that its lead wire is led out to the outside of the hermetically sealed container after being inserted between both coils wound around the adjacent tooth portions. The hermetic compressor according to any one of claims 1 to 5. 7. The hermetic compressor according to claim 1, wherein the DC brushless motor uses a permanent magnet made of a rare earth magnet for its rotor.