JPH0735080A - Scroll compressor - Google Patents

Abstract

PURPOSE:To properly detect the temperature of a scroll compressor installed therein when an air conditioning unit and the like has some abnormality by detecting the temperature of an electric motor using a temperature detection means disposed in the position of the outer surface of a sealed housing which corresponds to the electric motor. CONSTITUTION:A temperature detection means 41 having a temperature switch as its main part is disposed on the outer peripheral surface of a sealed housing 6 and in a position corresponding to the stator of an electric motor 7. If the temperature detection means 41 detects that only the temperature of the electric motor 7 continued to rise over a long period of time, rotation of the scroll compressor is stopped as soon as the temperature of the electric motor 7 reaches a predetermined value. The temperature of the electric motor is thus detected by the temperature detection means disposed in the position of the outer surface of the sealed housing which corresponds to the electric motor, and when the temperature of the electric motor portion has reached the predetermined value the temperature detection means is operated to stop operation of the scroll compressor, so burning of the electric motor and damage to the compressor mechanism can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor provided in a refrigeration system or the like.

[0002]

2. Description of the Related Art FIGS.
11 is a view showing a conventional scroll compressor disclosed in Japanese Patent No. 134894, FIG. 11 is a cross-sectional view, FIG. 12 is an explanatory view of an operating state of the scroll compressor of FIG. 11, and FIG. 13 is provided with the scroll compressor of FIG. Fig. 11 shows the prepared refrigeration circuit diagram.
3 is a control graph of the scroll compressor of FIG. In the figure,
(1) is a fixed scroll having a scroll (1b) provided on the lower surface of the base plate (1a). (2) is an orbiting scroll, which is provided with a scroll body (2b) that meshes with the scroll body (1b) of the fixed scroll (1) on the upper surface of the base plate (2a), and swings in the lower center part of the base plate (2a). Drive shaft (2c)
Is projected. (3) is a suction port formed on the outer circumference of the fixed scroll (1) and the orbiting scroll (2), and (4) is a discharge port provided at the center of the base plate (1a) of the fixed scroll (1). .

Reference numeral (5) is a compression chamber formed by the spiral body (1b) and the spiral body (2b) engaging with each other, and (6) is a closed chamber containing the fixed scroll (1) and the orbiting scroll (2). The container, (7), is an electric motor provided in the closed container (6), and is composed of a rotating shaft (8) fixed to a stator and a rotor. Also,
Large diameter part (8a) is provided at the upper end of the rotating shaft (8) and the eccentric hole (8b)
Is formed, and an eccentric oil supply hole (8c) that is eccentrically provided in the longitudinal direction and is provided so as to penetrate therethrough is disposed. Reference numeral (9) is a rocking bearing fitted in the eccentric hole (8b) to support the rocking shaft (2c) of the rocking scroll (2) in the radial direction.

Reference numeral (10) is a joint means consisting of an Oldham's joint for restricting the orbiting scroll (2) to revolve when the rotating shaft (8) rotates. (11) is a closed container
A suction pipe provided in (6) and a discharge pipe (12) provided in the closed container (6) deliver the compressed refrigerant from the discharge port (4) to the outside of the closed container (6). (13) is a frame which is provided in the closed container (6) and supports the fixed scroll (1), which supports the orbiting scroll (2) in a swingable manner and has a recess (where a joint means (10) is provided ( 13a), an oil return hole (13b) and a refrigerant passage (13c) are formed.

(14) is a rotary shaft provided on the frame (13)
A bearing that pivotally supports the large diameter portion (8a) of (8), (15) is provided in the closed container (6) to support the frame (13) and the stator of the electric motor (7), and the rotating shaft (8). An oil return hole (15a) and refrigerant passages (15b), (15c) are provided in a bracket that supports the above.
(16) is an oil cap attached to the lower end of the rotating shaft (8) of the electric motor (7), and (17) is lubricating oil contained in the closed container (6). (18) is a plate inserted between the back surface of the base plate (2a) of the orbiting scroll (2) and the frame (13), and the orbiting scroll (2) revolves while being pressed by the plate (18). Do exercise.

Reference numeral (19) is a compression mechanism mainly composed of a fixed scroll (1) and an orbiting scroll (2), and (20) is a large diameter portion (8a) of an electric motor (7) rotating shaft (8) and an eccentric hole. (8b) and an eccentric hole (8b) are rocking means having a rocking bearing (9) which is fitted in the eccentric hole (8b) and radially supports the rocking shaft (2c) of the rocking scroll (2) as a main part. In addition, the solid line arrow shown in FIG. 11 shows the flow of a refrigerant, and the broken line arrow shows the flow of lubricating oil (17).

The conventional scroll compressor is constructed as described above. When the electric motor (7) is energized to rotate the rotary shaft (8), the orbiting scroll (2) rotates by the Oldham ring of the joint means (10). Revolves while being blocked. Thereby, the refrigerant gas from the suction pipe (11) is the refrigerant passage (13c), the refrigerant passage (15b),
(15c), through the suction port (3), flows into the compression chamber (5), is gradually compressed, and the compressed refrigerant is discharged from the discharge pipe (12) through the discharge port (4). Then, when the scroll compressor is activated, an abnormality as shown in FIG. 12 may occur during exercise.

That is, a gas leak state of the refrigerant from the refrigeration circuit occurs, and the refrigerant in the refrigeration circuit is extremely reduced or becomes close to zero. If the scroll compressor continues to operate in this state, part of the compression mechanism (19) and the motor
Only the temperature of (7) rises abnormally and the electric motor (7) is damaged. Also, in an air conditioner or the like, when the circuit operation valve is forgotten to be opened when the refrigerant circuit is connected and the scroll compressor is operated in this state, no refrigerant flows, that is, the scroll compressor is in a vacuum state. As a result, the temperature of only a part of the compression mechanism (19) and the electric motor (7) rises abnormally and the compression mechanism (19) is damaged or the electric motor (7) is damaged.

Further, when the voltage supplied to the scroll compressor during startup of the scroll compressor is extremely lowered due to power supply conditions or some other reason, the scroll compressor cannot be started and the supply voltage is low. Therefore, although illustration is omitted, when the current cannot be detected even by the current detection protection provided in the compressor drive device, the scroll compressor does not rotate and only the electric power is continuously supplied. As a result, the temperature of the compression mechanism (19) does not rise and only the temperature of the electric motor (7) continues to rise abnormally, and the electric motor (7) is damaged.

The scroll compressor is arranged in the air conditioner as shown in FIG. 13, for example, and is controlled as shown in FIG. That is, in FIG. 13, the compressor (21),
The four-way valve (22), the outdoor heat exchanger (23), the pressure reducing device (24) and the indoor heat exchanger (25) are sequentially connected to form a heat pump type refrigeration cycle. An outdoor fan (26) is provided facing the outdoor heat exchanger (23), and an indoor fan (27) is provided facing the indoor heat exchanger (25). (28) is an inverter device that supplies electric power to the compressor (21), which outputs a three-phase alternating current of an arbitrary frequency, and the compressor (21) is driven at a variable speed according to the frequency of the output alternating current of the inverter device (28). To be done.

Further, the output frequency of the inverter device (28) is the temperature of the room temperature sensor (29) provided at the inlet of the indoor heat exchanger (25) and the temperature of the room temperature setting device (30) arbitrarily set by the user. The difference is determined by the frequency determiner (31). (32) is a compressor (21), an inverter device (28) and a frequency determiner (31)
Is a control device connected to. Then, the control device (32) operates as described below. That is, in FIG. 14, when the temperature of the compressor (21) case is 100 ° C. or lower during rising and 95 ° C. or lower when falling, that is, in FIG.
In the C zone indicated by (1), the frequency required by the frequency determiner (31) is directly commanded from the control device (32) to the inverter device (28). At this time, no limitation is imposed on the maximum frequency, that is, the rotation speed.

The temperature of the compressor (21) case is 100 °
In the case of C or more, that is, in the zone A in FIG. 14, a value obtained by reducing the frequency required by the frequency determiner (31) by a constant value is output from the control device (32) at regular time intervals. Although protection in normal operation is performed in the operation control of the air conditioner as described above, an abnormality occurs during the operation described above, that is, only a part of the compression mechanism (19) and the temperature of the electric motor (7) rise abnormally. If the temperature of the discharge pipe (12) or the discharge pipe (1
2) The temperature of the compressor (21) cannot be detected sufficiently and the compression mechanism (19) is damaged or the electric motor (7) is burned out only by detecting only the temperature of the closed container (6), which is almost proportional to the temperature. Will be done.

FIG. 15 is a sectional view showing another conventional scroll compressor. In the figure, the same reference numerals as those in FIG. 11 indicate corresponding parts, and (2c) is a base plate (2b) of the orbiting scroll (2).
Is a cylindrical rocking shaft portion projecting from the lower surface of the central portion of the. (3
3) is a rocking bearing that is arranged inside the rocking shaft portion (2c) in a fitted state to support the rocking shaft portion (2c) in the radial direction, and the upper end (8d) of the rotary shaft (8) is A fitted through hole (34) is provided.

Reference numeral (13) is a frame which is provided in the closed container (6) and supports the fixed scroll (1).
A recess (13a) for swingably supporting the joint means (10) is formed, and a bearing (35) for supporting the rotating shaft (8) is formed near the lower end. (36) is arranged in the through hole (34) and both ends are the inner wall of the rocking bearing (33) and the rotary shaft, respectively.
(8) The upper end (8d) is arranged on the side surface, and the rotary shaft (8) upper end (8d)
It is a relief mechanism composed of a push spring for pressing the rocking bearing (33).

FIG. 16 is a view showing another conventional scroll compressor, and is a cross-sectional view of an essential part. In the figure, FIG.
15, the same reference numerals as those in FIG. 15 indicate corresponding parts, and (37) is a bolt which is inserted through the edge of the base plate (1a) of the fixed scroll (1) with a gap and is screwed into the frame (13), 38) is a bolt (3
It is fitted between the base plate (1a) and the head of the bolt (37) by being fitted to the base plate (1a) and presses the fixed scroll (1) against the frame (13), that is, the push for biasing to the orbiting scroll (2) side. It is a relief mechanism consisting of a spring. (39) is the base plate (1a) of the fixed scroll (1)
And a pin which is fitted in a hole (40) provided at the edge of the frame (13) to prevent the fixed scroll (1) from rotating with respect to the frame (13).

In the scroll compressor shown in FIGS. 15 and 16, the compression mechanism (19) is provided with relief mechanisms (36) and (38) having a push spring as a main part. That is, liquid compression occurs at the time of starting the scroll compressor, but at this time, the scroll body (1b) of the fixed scroll (1) and the orbiting scroll (2),
An excessive load acts on (2b). However, in the case of the scroll compressor of FIG. 15, the orbiting scroll (2) is displaced by the relief mechanism (36) in the direction orthogonal to the axis of the rotary shaft (8) to avoid the above-mentioned overload. Further, in the case of the scroll compressor shown in FIG. 16, when the orbiting scroll (2) is displaced in the axial direction of the rotary shaft (8), the fixed scroll (1) is orbital scroll (2).
The fixed scroll (1) is displaced upward in FIG. 16 by the relief mechanism (38) at this time, but the excessive load is avoided. As a result, the spiral body (1
It is designed to prevent damage to b) and (2b).

The purpose of these relief mechanisms (36), (38) is to prevent the breakage of the spiral bodies (1b), (2b) during the above-mentioned liquid compression. However, for example, the scroll compressor can be protected to some extent even against an abnormal state that occurs during normal operation of the air conditioner, and the following protection against the abnormal state shown in FIG. Is possible.

That is, when the refrigerant leaks from the refrigeration circuit and the refrigerant in the refrigeration circuit becomes extremely low or close to zero, a part of the compression mechanism (19), In particular, the temperature at the center of the spiral bodies (1b) and (2b) rises abnormally. If this state continues, the scrolls (1b), (2b) will expand vertically due to the thermal expansion of the scrolls (1b), (2b), and the fixed scroll
The gap between the spiral bodies (1b) and (2b) of (1) and the orbiting scroll (2), which is usually several microns to several tens of microns, is zero.

Therefore, the spiral bodies (1b) and (2b) start to come into contact with each other and the temperature further rises, and
An excessive load acts on b) and (2b). However, since the orbiting scroll (2) is displaced by the relief mechanisms (36) and (38) in the axial direction or the direction orthogonal to the axial line, the temperature rise of the scrolls (1b) and (2b) can be prevented. Thus, the compression mechanism (1
Although the damage of 9) can be prevented, the temperature of the electric motor (7) continues to rise and eventually the electric motor (7) burns out.

Further, even when the scroll compressor continues to rotate in the vacuum operation state, the operation state is the same as when the gas leakage state occurs, and the compression mechanism (19) can be prevented from being damaged. However, the electric motor (7) burns out. In addition, in another abnormal state, in which the low-voltage start-up is impossible, the scroll compressor does not operate, and electric power is continuously supplied only to the electric motor (7). Therefore, the relief mechanisms (36), (38)
Regardless of the presence or absence of the above, the electric motor (7) is burnt out as in the above-mentioned abnormal state.

[0021]

In the conventional scroll compressor as described above, when the scroll compressor continues to rotate in the gas leakage state of the refrigerant and the generated vacuum operating state, which is disposed in the air conditioner or the like, When an abnormality such as a low-voltage unstartable state occurs, the temperature of the scroll compressor is sufficiently detected, and the compressor is damaged and the motor is burned.

The present invention has been made to solve the above problems, and an object thereof is to obtain a scroll compressor capable of properly detecting the temperature of the scroll compressor equipped when an abnormality occurs in an air conditioner or the like. And

[0023]

In a scroll compressor according to a first aspect of the present invention, a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral A fixed scroll provided with a body and having a discharge hole for compressed refrigerant formed therein and fixed in an airtight container, and a spiral body arranged opposite to the fixed scroll and meshing with the spiral body are provided to engage with the rotating shaft of the electric motor. The orbiting scroll is swung with respect to the fixed scroll and the compression mechanism composed of the combined orbiting scroll, and the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are directed from the outside to the inside. Provided in either of the above, a swinging means for gradually reducing the size to achieve a compression action, a joint means for preventing the swinging scroll from rotating and revolving with respect to the fixed scroll. And a relief mechanism for holding the scroll so as to be displaceable with respect to the rotating shaft in either the axial direction of the rotating shaft or the direction orthogonal to the rotating shaft, and the temperature detecting means provided on the outer surface of the hermetically sealed container at a position corresponding to the electric motor. And are provided.

In the scroll compressor according to the second aspect of the present invention, there is provided a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral body. A fixed scroll provided with a discharge hole for the compressed refrigerant and fixed in an airtight container, and a scroll body disposed opposite to the fixed scroll and meshing with the scroll body are provided. The orbiting scroll is orbited relative to the fixed scroll and the compression mechanism consisting of the dynamic scroll, and the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually contracted from the outside to the inside. And a coupling means for preventing the orbiting scroll from rotating and revolving with respect to the fixed scroll. A relief mechanism that holds the crawl so that it can be displaced in either the axial direction or the orthogonal direction of the rotary shaft with respect to the rotary shaft, the temperature detection means that is provided on the outer surface of the sealed container and is located at the position corresponding to the electric motor, and is fixed. A bypass mechanism, which is provided on the scroll and connects the discharge pressure space and the suction pressure space of the closed container when the temperature exceeds a predetermined temperature, is provided.

Further, in the scroll compressor according to the third aspect of the present invention, there is provided a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral body. A fixed scroll having discharge holes for compressed refrigerant formed therein and fixed in an airtight container, and a scroll body disposed opposite to the fixed scroll and meshing with the scroll body are provided. The orbiting scroll is orbited relative to the fixed scroll and the compression mechanism consisting of the dynamic scroll, and the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually contracted from the outside to the inside. And a coupling means for preventing the orbiting scroll from rotating and revolving with respect to the fixed scroll. A relief mechanism that holds the crawl so that it can be displaced in either the axial direction or the orthogonal direction of the rotary shaft with respect to the rotary shaft, the temperature detection means provided on the outer surface of the closed container at the position corresponding to the electric motor, and the discharge By determining the temperature provided in the pipe and detecting both the amount of change in the motor current that flows when the motor starts operating and the amount of change in the discharge pipe temperature at the same time, it is determined whether or not the motor can continue operating based on the changes in both of the above. And a temperature sensing element provided for the.

Further, in a scroll compressor according to a fourth aspect of the present invention, a hermetically sealed container provided with a refrigerant discharge pipe, an electric motor provided in the hermetically sealed container, and a spiral body are provided. A fixed scroll having discharge holes for compressed refrigerant formed therein and fixed in an airtight container, and a scroll body disposed opposite to the fixed scroll and meshing with the scroll body are provided. The orbiting scroll is orbited relative to the fixed scroll and the compression mechanism consisting of the dynamic scroll, and the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually contracted from the outside to the inside. And a coupling means for preventing the orbiting scroll from rotating and revolving with respect to the fixed scroll. A relief mechanism that holds the crawl so that it can be displaced in either the axial direction or the orthogonal direction of the rotary shaft with respect to the rotary shaft, the temperature detection means provided on the outer surface of the closed container at the position corresponding to the electric motor, and the discharge By detecting the temperature provided in the pipe, controlling the electric motor with an inverter drive device with variable operating frequency, and detecting both the amount of change in the electric motor current flowing to the electric motor at the start of its operation and the amount of change in the discharge pipe temperature at the same time. A temperature detecting element used for setting the operating frequency of the electric motor is provided according to the change amounts of both of the above.

[0027]

In the invention according to claim 1 of the present invention configured as described above, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container.

Further, in the invention according to claim 2 of the present invention configured as described above, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Further, when an abnormal operating state occurs, the temperature rise of the electric motor is detected by repeating the opening operation of the bypass mechanism due to the temperature rise near the compression mechanism.

In the invention according to claim 3 of the present invention configured as described above, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Also, by simultaneously detecting both the amount of change in the electric motor current that flows at the start of operation of the electric motor and the amount of change in the discharge pipe temperature due to the temperature detection element, it is determined whether or not the electric motor can continue operating through the respective amounts of change. To be done.

According to the invention of claim 4 of the present invention configured as described above, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. In addition, by controlling the electric motor with an inverter drive device with a variable operating frequency to detect both the amount of change in the electric motor current flowing through the electric motor at the start of operation and the amount of change in the discharge pipe temperature by the temperature detection element, both of the above The operating frequency of the electric motor is set through the change amount of.

[0031]

【Example】

Example 1. 1 to 3 are views showing an embodiment of the present invention, FIG. 1 is a sectional view, FIG. 2 is a refrigeration circuit diagram provided with the scroll compressor of FIG. 1, and FIG. 3 is a scroll compressor of FIG. FIG. 3 is an explanatory diagram of an operating state of In the figure, FIG. 13 and FIG.
The same reference numeral as 5 indicates a corresponding part, and (41) is a temperature detecting means having a temperature switch as a main part, which is provided on the outer peripheral side surface of the closed container (6) and arranged at a position corresponding to the stator of the electric motor (7). A metal fitting (42) and a clip (43) attached to the outer peripheral side surface of the hermetically sealed container (6) for mounting the temperature switch on the outer peripheral side surface of the hermetically sealed container (6) in a pressed state, and the hermetically sealed container covering the temperature switch ( The cover (44) is attached to the outer peripheral surface of (6) to keep the temperature switch warm so as not to be cooled.

In the scroll compressor constructed as described above, the compression mechanism (19) is provided with the relief mechanism (36), and the scroll body (2b) of the orbiting scroll (2) is provided with the relief mechanism (36) when liquid compression occurs. When an excessive load acts, the orbiting scroll (2) is displaced by the relief mechanism (36) in the direction orthogonal to the axis of the rotary shaft (8), and the excessive load is avoided. This prevents damage to the spiral body (2b). The purpose of this relief mechanism (36) is to prevent damage to the spiral body (2b) at the time of liquid compression as described above, but it is also effective as a protection measure against an abnormal condition that occurs during normal operation of the air conditioner described above, for example. Is.

Further, when the scroll compressor of FIG. 1 is operated in a normal state, when the electric motor (7) is energized, the rotating shaft (8)
Is rotated and the orbiting scroll (2) revolves in a state where its rotation is blocked by the joint means (10). As a result, suction gas is taken from the suction pipe (not shown) into the compression chamber (5) through the suction port (3), gradually compressed, and discharged from the discharge port (4) to the discharge pipe (1).
Discharge compressed refrigerant to 2). However, for example, when the refrigerant in the refrigeration circuit decreases due to leakage from the circuit, the compression action of the suction gas in the compression chamber (5) is not performed. Therefore, the amount of the refrigerant flowing from the discharge port (4) to the discharge pipe (12) is reduced, the temperature of the compression mechanism (19) does not rise, and only the temperature of the electric motor (7) to which power is continuously supplied rises.

As described above, when the temperature of the electric motor (7) reaches a predetermined value when the temperature of the electric motor (7) alone continues to rise for a long time, the temperature detecting means (41) operates to perform scroll compression. The operation of the machine is stopped. This allows the electric motor
It is possible to prevent burnout of (7), prevent accidents accompanying it, and obtain a highly reliable scroll compressor.

The scroll compressor is arranged in the air conditioner as shown in FIG. 2, for example. That is, in FIG. 2, (45) is a throttling device, (46) and (47) are connection means for the outdoor side and the indoor side having circuit operation valves (46a) and (47a), respectively (4
Reference numeral 8) is a drive power supply device for the compressor (21), which is provided with an electric circuit which is deenergized by operating the temperature detecting means (41). Then, in the air conditioner shown in FIG. 2, after connecting the outdoor side and the indoor side by the connecting means (46) and (47), the circuit operation valves (46a) and (47a) are opened to establish a normal refrigeration cycle. Work to establish is done. However, the circuit operated valve (46a), (4
There are times when we forget to open 7a), and at this time the following situations occur.

That is, when power is supplied to the compressor (21) in this state, the refrigerant does not flow in the refrigeration circuit and the compressor (21) does not flow.
Only will continue to rotate. If this state continues for a long time, the inside of the compressor (21) reaches a vacuum state, but since the power is supplied to the compressor (21), the temperature of the electric motor (7) continues to rise. On the other hand, since the compression mechanism (19) continues to operate in a state where no refrigerant flows, only the central parts of the scrolls (1b), (2b) of the fixed scroll (1) and the orbiting scroll (2) of the compression mechanism (19). The temperature rises especially.

On the other hand, in the scroll compressor of FIG. 1, a temperature detecting means (41) is provided on the outer peripheral side surface of the closed container (6), and a relief mechanism (36) is provided in the compression mechanism (19). There is. As a result, when the temperature of the electric motor (7) reaches a predetermined value, the temperature detection means (41) operates and the operation of the scroll compressor is stopped to prevent the electric motor (7) from being burnt and accompanied. Accidents can be prevented and a highly reliable scroll compressor can be obtained.

Regarding the damage of the compression mechanism (19) caused by the local abnormal temperature rise in the central portions of the spiral bodies (1b), (2b) of the fixed scroll (1) and the orbiting scroll (2), the compression mechanism (19)
It can be avoided by the relief mechanism (36) provided in the section. That is, the circuit operation valves (46a), (47
When a vacuum operation state inside the scroll compressor occurs due to forgetting to open a), the refrigerant does not flow at all and the temperature of the electric motor (7) rises as well as the compression means (19).
The temperature near the center of the spiral bodies (1b), (2b) also gradually increases. At this time, the temperature of the electric motor (7) reaches a predetermined value before the temperature in the vicinity of the central portions of the spiral bodies (1b), (2b) abnormally rises, and the temperature detection means (41) operates to operate the scroll compressor. The operation can be stopped.

However, the temperature around the scroll compressor,
If it takes a long time for the temperature detection means (41) to operate due to seasonal temperature fluctuations, the spiral body (1) of the compression mechanism (19)
b), (2b) The temperature near the center increases and reaches an abnormal value.
In this state, the spiral body (1b), (2b) is thermally expanded and the spiral body (1b)
b) and (2b) extend in the vertical direction, and the gap between the fixed scroll (1) and the orbiting scroll (2) spiral bodies (1b) and (2b) is usually several microns to several tens of microns. It becomes zero.

Therefore, the spiral bodies (1b) and (2b) start to come into contact with each other and the temperature further rises, and
Excessive load acts on b) and (2b), causing damage to the spiral bodies (1b) and (2b). However, if an excessive load acts on the scrolls (1b), (2b), the relief mechanism (36) will cause the orbiting scroll (2) to move.
Can be displaced in the direction orthogonal to the axis to prevent the spiral bodies (1b) and (2b) from being damaged. Then, when the operation is further continued, the temperature detecting means (41) on the outer peripheral side surface of the closed container (6) operates to stop the operation of the scroll compressor.

That is, when the compression mechanism (19) may be damaged before the temperature rise of the electric motor (7), the function of protecting the compression mechanism (19) until the temperature rise of the electric motor (7), that is, the relief. By providing the mechanism (36), it is possible to more reliably protect the scroll compressor in the abnormal state. As described above, in the embodiment of FIGS. 1 to 3, the temperature detecting means (41) is provided at the position corresponding to the electric motor (7) on the outer peripheral side surface of the closed container (6).
And a relief mechanism (36) that displaces in the direction orthogonal to the axis of the rotating shaft (8). As a result, when the temperature of the electric motor (7) reaches a predetermined value when an abnormal operating state as shown in FIG. 3 occurs, the temperature detecting means (41) operates to stop the operation of the scroll compressor, and the electric motor ( It is possible to obtain a highly reliable scroll compressor by preventing the burnout of 7) and the damage of the compression means (19) and preventing accidents that accompany it.

Further, the scroll compressor having the structure shown in FIG. 4 can be easily obtained by applying the embodiment shown in FIGS. FIG. 4 is a sectional view of a main part of the scroll compressor. In the figure, the same reference numerals as those in FIGS. 1 to 3 and 16 indicate corresponding parts, and (38) is a relief mechanism which is displaced in the axial direction of the rotating shaft (8). Is. Also in the configuration of FIG. 4, the temperature detecting means (41) is provided on the outer peripheral side surface of the closed container (6) at a position corresponding to the electric motor (7), and the relief mechanism (38) is displaced in the axial direction of the rotating shaft (8).
Is provided. Therefore, although detailed description is omitted, it is obvious that the scroll compressor can be surely protected when an abnormal operation state as shown in FIG.

Example 2. FIG. 5 is a sectional view of a scroll compressor showing another embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate corresponding parts, (49) is a discharge space formed between the fixed scroll (1) near the upper end in the closed container (6), and (50) is the fixed scroll (1 ) Is a bypass mechanism that is provided so as to penetrate the base plate (1a) of (1) and that has a hole that communicates with the discharge space (49) and the suction port (3). Reference numeral (51) is a bimetal valve provided in the large diameter portion of the bypass mechanism (50), which is closed at normal temperature and opened at a temperature higher than a predetermined temperature. (52) is provided between the restraining plate fastened to the base plate (1a) and the bimetal valve (51) provided in the large-diameter part of the bypass mechanism (50) to bypass the bimetal valve (51). ) Is a compression coil spring that presses against the bottom surface of the large diameter portion.

In the scroll compressor configured as described above, the compression mechanism (19) is provided with the bypass mechanism (50) for communicating the high pressure space and the low pressure space, and the abnormal operation state as shown in FIG. 3 is generated. At times, by combining with the bypass mechanism (50), the protective action of the scroll compressor can be improved. For example, in the case of a scroll compressor arranged in the air conditioner, after connecting the outdoor side and the indoor side shown in FIG. 2 by the connecting means (46) and (47) at the time of installing the air conditioner,
By forgetting to open the circuit control valves (46a), (47a), a vacuum operating state occurs inside the compressor (21). In this case, since the refrigerant does not flow at all, the temperature of the electric motor (7) rises and the fixed scroll (1) and the orbiting scroll (2) of the compression mechanism (19).
The temperature rise near the center of the spiral bodies (1b), (2b).

At this time, when the temperature exceeds a predetermined value, the bimetal valve (51) provided in the fixed scroll (1) opens,
The discharge space (49) communicates with the vacuum inlet (3) space.
As a result, the refrigerant flows from the discharge space (49) into the suction port (3) space to temporarily eliminate the vacuum state of the suction port (3), lowering the temperature of the compression mechanism (19), and When the temperature is lower than the specified value, the bimetal valve (51) is closed. And
Since the temperature of the electric motor (7) rises while the opening and closing of the bypass mechanism (50) is repeated, the temperature detecting means (41) on the outer peripheral side surface of the closed container (6) operates and the scroll compressor operates. Stop.

In the embodiment of FIG. 5, temperature detecting means (41) is provided on the outer peripheral side surface of the closed container (6) at a position corresponding to the electric motor (7),
Also, an electric motor based on repeated opening and closing of the bypass mechanism (50)
The scroll compressor is deactivated by the temperature rise of (7). Therefore, although detailed description is omitted, in the embodiment of FIG. 5 as well, similar to the embodiments of FIGS. 1 to 3, it is possible to obtain the action of reliably protecting the scroll compressor when an abnormal operating state as shown in FIG. 3 occurs. That is clear.

Example 3. 6 to 8 are also views showing another embodiment of the present invention, FIG. 6 is a sectional view, FIG. 7 is a refrigeration circuit diagram in which the scroll compressor of FIG. 6 is provided, and FIG. 8 is a scroll compression of FIG. It is a graph which shows the electric current at the time of starting of a machine, and the relationship of a discharge pipe temperature. In the figure, the same reference numerals as those in FIGS. 2 and 5 indicate the corresponding parts, and (53) is a fitting (54) for the discharge pipe (12).
It is a temperature detection element consisting of a temperature detection thermistor attached by the.It has a function to detect the temperature, but the electric circuit for stopping the compressor (21) like the temperature detection means (41) is not configured and the drive power supply Emits a temperature signal to the device (48).

In the embodiment of FIGS. 6 to 8, for example, in the case of the scroll compressor arranged in the air conditioner, when the refrigeration circuit is normally formed and the compressor (21) is operated, In Fig. 7, in order to compare the time when the circuit operation valves (46a) and (47a) are operated in a closed state, that is, the case where they are operated in a vacuum operation state, the current flowing through the compressor (21) and
FIG. 8 shows the temperature data detected by the temperature detecting element (53) mounted on the discharge pipe (12) on the same graph. In FIG. 8, the horizontal axis shows the elapsed time after the compressor (21) is started, and the vertical axis shows the current I of the compressor (21) and the temperature Te of the discharge pipe (12) Te.
mp. It is a graph which shows.

In FIG. 8, the solid curve is the current I and the temperature T of the discharge pipe (12) when the compressor (21) is started in a normal state.
emp. The broken line curve indicates that the compressor (21) is in an abnormal state,
For example, the current I and the discharge pipe (12) when in a vacuum operation state
Temperature Temp. Is. There is a method described below as a method for detecting an abnormal state such as the vacuum operation state. That is, the current I of the compressor (21) and the temperature Tem of the discharge pipe (12)
p. After starting, a check is made after a lapse of a predetermined time to detect a difference from the normal operation state. Then, when the difference exceeds the reference current value and the reference temperature value, the operation of the compressor (21) is stopped.

By using such a method, the measurement of ΔT ₁ and ΔI ₁ at checkpoint 1 in FIG.
Installed in the control board (not shown) of 8) and installed in the compressor (2
The compressor (21) can be electrically protected by the operating state of 1). The reason why ΔT and ΔI occur as shown in FIG. 8 is, for example, when the refrigerant normally flows in the refrigeration circuit and when the compressor (21) does not flow the refrigerant as in the vacuum operation. The following is a comparison with the case of driving.
That is, if the refrigerant normally flows in the refrigeration circuit, the compressor (2
As 1), it does the work of compressing the refrigerant, resulting in a higher current. Further, since the compressed refrigerant has a high temperature and high pressure, the temperature of the discharge pipe (12) through which the refrigerant passes becomes high.

However, when the refrigerant does not flow, that is, when the compressor (21) does not work as in the vacuum operation, the current is low and the temperature of the discharge pipe (12) is low. Further, as shown in FIG. 8, for example, by further increasing the above-mentioned checkpoint by one place, setting checkpoint 2 and detecting ΔT and ΔI twice, it is possible to more reliably determine the abnormal state. . As a result, the operation of the scroll compressor can be stopped due to the occurrence of an abnormal state without changing the internal structure of the compressor (12) in the embodiments of FIGS. Further, it is possible to prevent the electric motor (7) from being burnt out at a low cost, prevent accidents that accompany this, and obtain a highly reliable scroll compressor.

Example 4. 9 and 10 are also diagrams showing another embodiment of the present invention. FIG. 9 is a graph showing the operating frequency of the scroll compressor after starting, and FIG. 10 is a diagram showing the operating control of the scroll compressor of FIG. Is a flow chart,
The scroll compressor has the same structure as that of the embodiment shown in FIGS. FIG. 9 is a graph in which the horizontal axis represents the elapsed time after starting the compressor (21) and the vertical axis represents the operating frequency.
This is an embodiment by means of an abnormal state determining means when (21) is driven by a frequency variable drive power supply device, that is, an inverter drive device. In the case of operation by the inverter drive power supply,
As in the embodiment of FIG. 8, the compressor (21) is not controlled by either energizing or deenergizing, and the frequency is lowered when it is determined that the engine is in an abnormal operating state.

That is, for example, the problem that occurs in the scroll compressor can be solved by detecting the temperature while continuing to operate the scroll compressor arranged in the air conditioner, without repeating either energizing or deenergizing. You can
That is, after the compressor (21) is activated, control is performed by the determination at the check points indicated by the circles in FIG. And
The steps indicated by circles 1-3 in the flowchart of FIG. 10 correspond to the check points 1-3 indicated by circles in FIG.
The current I flowing through the compressor (21) and the discharge pipe (12) at each start-up
Temperature Temp. Is detected twice.

The frequency is increased only when both of these two detections are normal, and the compressor (21) is operated in the normal mode. When both detections are abnormal, the compressor (21) is stopped. It Therefore, even if it is judged as abnormal by the first detection, if both the temperature and the current become normal in the subsequent operation, the operation continues normally, and the scroll compressor arranged in the air conditioner or the like. It is possible to avoid the malfunction of the abnormal state detecting means in the above. As a result, the scroll compressor can be protected against the occurrence of an abnormal state, the electric motor (7) can be prevented from being burnt out, and accidents accompanying it can be prevented, and the scroll is highly reliable. A compressor can be obtained.

The current I and the temperature Te of the compressor (21) in the embodiments of FIGS. 6 to 8 and the embodiments of FIGS.
mp. The abnormal state detecting means based on the detection of (1) discriminates the determination standard by the difference ΔI, ΔT between the normal state and the abnormal state. But,
It is possible to change the determination method depending on the installation condition or operating condition of the air conditioner or the like, the capacity of the air conditioner or the like. For example, when the compressor (21) operates normally, the current I, the discharge pipe (12) temperature Temp. Both will show high values.

That is, the amount of change with respect to the elapsed time after the start of the compressor (21) is significantly higher than that in the abnormal state, for example, the vacuum operation state. Therefore, the values of the current and temperature changes ΔI / Δt and ΔTemp / Δt are detected, and the normal state or the abnormal state is detected depending on whether these values are larger or smaller than the value measured several seconds later. It is also possible.

[0057]

As described above, the invention according to claim 1 of the present invention includes a closed container provided with a refrigerant discharge pipe,
An electric motor provided in the closed container, a fixed scroll provided with a spiral body and having a discharge hole for compressed refrigerant formed therein, and a fixed scroll fixed in the closed container, and the fixed scroll arranged to face the fixed scroll to form a spiral body. It is formed between the compression mechanism, which is provided with a spiral body that meshes with the rotating shaft of the electric motor, and the orbiting scroll, which is rotated between the fixed scroll and the fixed scroll. An oscillating means for gradually compressing the plurality of compression chambers from the outside to the inside to achieve a compression action, a joint means for preventing the orbiting scroll from rotating and revolving with respect to the fixed scroll, and both of the above. A relief mechanism that is provided in any of the above and holds the scroll so as to be displaceable in either the axial direction of the rotating shaft or the direction orthogonal to the rotating shaft with respect to the rotating shaft, and It provided with is provided with a temperature detection means arranged on the motor corresponding positions.

As a result, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Then, when the temperature of the electric motor portion reaches a predetermined value, the temperature detecting means operates to stop the operation of the scroll compressor. Therefore, it is possible to prevent burnout of the electric motor and damage to the compression mechanism, prevent accidents that accompany this, and obtain a highly reliable scroll compressor.

As described above, the invention according to claim 2 of the present invention is such that a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral body are provided for compression. A fixed scroll having discharge holes for the formed refrigerant and fixed in an airtight container, and a scroll body arranged facing the fixed scroll and meshing with the scroll body are provided, and swinging is engaged with the rotating shaft of the electric motor. By rotating the orbiting scroll with respect to the compression mechanism composed of the scroll and the fixed scroll, the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually contracted from the outside to the inside. A swinging means that achieves a compression action, a joint means that prevents the swinging scroll from rotating and revolves around the fixed scroll, and a scroll provided in either of the above A relief mechanism that holds the rotary shaft so that it can be displaced either in the axial direction of the rotary shaft or in the direction orthogonal to the axial line, the temperature detection means provided on the outer surface of the closed container at the position corresponding to the electric motor, and the fixed scroll. A bypass mechanism is provided which connects the discharge pressure space and the suction pressure space of the closed container when the temperature exceeds a predetermined temperature.

As a result, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Further, when an abnormal operating state occurs, the temperature rise of the electric motor is detected by repeating the opening operation of the bypass mechanism due to the temperature rise near the compression mechanism. Then, when the temperature of the electric motor portion reaches a predetermined value due to the temperature increase of the electric motor and the temperature increase of the electric motor due to the repeated opening and closing of the bypass mechanism, the temperature detecting means operates and the operation of the scroll compressor is stopped. Therefore, it is possible to prevent burnout of the electric motor and damage to the compression mechanism, prevent accidents that accompany this, and obtain a highly reliable scroll compressor.

As described above, the invention according to claim 3 of the present invention is such that a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral body are provided for compression. A fixed scroll having discharge holes for the formed refrigerant and fixed in an airtight container, and a scroll body arranged facing the fixed scroll and meshing with the scroll body are provided, and swinging is engaged with the rotating shaft of the electric motor. By rotating the orbiting scroll with respect to the compression mechanism composed of the scroll and the fixed scroll, the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually reduced from the outside to the inside. A swinging means that achieves a compression action, a joint means that prevents the swinging scroll from rotating and revolves around the fixed scroll, and a scroll provided in either of the above A relief mechanism that holds the displaceable shaft in either the axial direction or the orthogonal direction of the rotary shaft with respect to the rolling shaft, the temperature detection means provided on the outer surface of the closed container at a position corresponding to the electric motor, and the discharge pipe. It is provided to detect the temperature and detect both the amount of change in the motor current flowing at the start of operation of the motor and the amount of change in the discharge pipe temperature at the same time to determine whether or not to continue operating the motor based on the changes in both. And a temperature detecting element for controlling the temperature.

As a result, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Further, by simultaneously detecting both the amount of change in the electric motor current that flows at the start of operation of the electric motor and the amount of change in the discharge pipe temperature by the temperature detection element, it is determined whether or not the electric motor can continue operating due to the respective amounts of change. . Then, when the temperature of the electric motor portion reaches a predetermined value, the temperature detecting means operates to stop the operation of the scroll compressor.
Further, it is determined whether or not the operation of the electric motor can be continued based on both the amount of change in the electric motor current and the amount of change in the discharge pipe temperature at the start of operation of the electric motor. Therefore, it is possible to prevent burnout of the electric motor and damage to the compression mechanism, prevent accidents that accompany this, and obtain a highly reliable scroll compressor.

As described above, the invention according to claim 4 of the present invention is such that a hermetic container provided with a refrigerant discharge pipe, an electric motor provided in the hermetic container, and a spiral body are provided for compression. A fixed scroll having discharge holes for the formed refrigerant and fixed in an airtight container, and a scroll body arranged facing the fixed scroll and meshing with the scroll body are provided, and swinging is engaged with the rotating shaft of the electric motor. By rotating the orbiting scroll with respect to the compression mechanism composed of the scroll and the fixed scroll, the plurality of compression chambers formed between the fixed scroll and the orbiting scroll are gradually reduced from the outside to the inside. A swinging means that achieves a compression action, a joint means that prevents the swinging scroll from rotating and revolves around the fixed scroll, and a scroll provided in either of the above A relief mechanism that holds the displaceable shaft in either the axial direction or the orthogonal direction of the rotary shaft with respect to the rolling shaft, the temperature detection means provided on the outer surface of the closed container at a position corresponding to the electric motor, and the discharge pipe. Both of the above are provided by detecting the temperature, controlling the electric motor by an inverter driving device with a variable operating frequency, and simultaneously detecting both the amount of change in the electric motor current flowing to the electric motor at the start of its operation and the amount of change in the discharge pipe temperature. A temperature detecting element used for setting the operating frequency of the electric motor is provided depending on the respective changes.

As a result, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Further, the electric motor is controlled by an inverter driving device having a variable operating frequency, and the amount of change in the electric motor current flowing through the electric motor at the start of its operation and the amount of change in the discharge pipe temperature are both detected at the same time. The operating frequency of is set. Then, when the temperature of the electric motor portion reaches a predetermined value, the temperature detecting means operates to stop the operation of the scroll compressor. Further, the motor is controlled by an inverter drive device with variable operating frequency, and both the amount of change in the motor current flowing through the motor at the start of its operation and the amount of change in the discharge pipe temperature are detected simultaneously. The operating frequency is set. Therefore, it is possible to prevent burnout of the electric motor and damage to the compression mechanism, prevent accidents that accompany this, and improve the reliability of the scroll compressor.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor showing a first embodiment of the present invention.

FIG. 2 is a refrigeration circuit diagram provided with the scroll compressor of FIG.

FIG. 3 is an explanatory diagram of an operating state of the scroll compressor of FIG.

FIG. 4 is a sectional view of a main part of a scroll compressor to which the scroll compressor of FIG. 1 is applied.

FIG. 5 is a sectional view of an essential part of a scroll compressor showing a second embodiment of the present invention.

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

7 is a refrigeration circuit diagram in which the scroll compressor of FIG. 6 is provided.

8 is a graph showing the relationship between the current and the discharge pipe temperature when the scroll compressor of FIG. 6 is started.

FIG. 9 is a graph showing Embodiment 4 of the present invention and is a graph showing an operating frequency after the scroll compressor is started.

FIG. 10 is a flowchart illustrating operation control of the scroll compressor shown in FIG. 9.

FIG. 11 is a sectional view of a conventional scroll compressor.

12 is an explanatory diagram of an operating state of the scroll compressor shown in FIG. 11.

FIG. 13 is a refrigeration circuit diagram in which the scroll compressor of FIG. 11 is provided.

FIG. 14 is a control graph of the scroll compressor shown in FIG. 11.

FIG. 15 is a sectional view showing another conventional scroll compressor.

FIG. 16 is a cross-sectional view of essential parts showing another conventional scroll compressor.

FIG. 17 is an explanatory diagram of an operating state of the scroll compressor shown in FIGS. 15 and 16.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed scroll 1b Swirl body 2 Oscillating scroll 2b Swirl body 4 Discharge port 5 Compression chamber 6 Sealed container 7 Electric motor 8 Rotating shaft 10 Joint means 12 Discharge pipe 19 Compression mechanism 20 Swing means 36 Relief mechanism 38 Relief mechanism 41 Temperature detection means 50 Bypass mechanism 53 Temperature sensing element

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

Therefore, the spiral bodies (1b) and (2b) start to come into contact with each other and the temperature further rises, and
An excessive load acts on b) and (2b). But fixed skull
The relief mechanism (36), (3
Because of the displacement in the axial direction or the direction orthogonal to the axial line by 8), it is possible to prevent the temperature rise of the spiral bodies (1b), (2b). Thus, although the compression mechanism (19) can be prevented from being damaged, the temperature of the electric motor (7) continues to rise and eventually the electric motor (7) is burned.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

[0021]

In THE INVENTION It is an object of the conventional scroll compressor as described above, are arranged in the air conditioner or the like refrigerant gas leakage state, or if the scroll compressor is continuously around in vacuum operating conditions, When an abnormality such as a low-voltage unstartable state occurs, the temperature of the scroll compressor is sufficiently detected, and the compressor is damaged and the motor is burned.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction content]

In the scroll compressor configured as described above, the compression mechanism (19) is provided with the bypass mechanism (50) for communicating the high pressure space and the low pressure space, and the abnormal operation state as shown in FIG. 3 is generated. At times, by combining with the bypass mechanism (50), the protective action of the scroll compressor can be improved. For example, in the case of a scroll compressor arranged in the air conditioner, after connecting the outdoor side and the indoor side shown in FIG. 2 by the connecting means (46) and (47) at the time of installing the air conditioner,
Circuit operating valve (46a), the compressor (21) in section vacuum operating condition occurs by forgetting the opening of (47a). In this case, since the refrigerant does not flow at all, the temperature of the electric motor (7) rises and the temperature near the center of the scrolls (1b), (2b) of the fixed scroll (1) and the orbiting scroll (2) of the compression mechanism (19). A rise occurs.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0064

[Correction method] Change

[Correction content]

As a result, the temperature of the electric motor is detected by the temperature detecting means arranged at the position corresponding to the electric motor on the outer surface of the closed container. Further, the electric motor is controlled by an inverter driving device having a variable operating frequency, and the amount of change in the electric motor current flowing through the electric motor at the start of its operation and the amount of change in the discharge pipe temperature are both detected at the same time. The operating frequency of is set. Then, when the temperature of the electric motor portion reaches a predetermined value, the temperature detecting means operates to stop the operation of the scroll compressor . Therefore, burning of the motor, failure of the compression mechanism can be prevented, can be prevented in advance accidents occurring in association with this, the effect of improving the reliability of the scroll compressor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenji Suzuki 3-18-1, Ogashi, Shizuoka City Mitsubishi Electric Corporation Shizuoka Manufacturing (72) Inventor Shoji Hagiwara 3-18-1, Oka Shizuoka Mitsubishi Electric Corporation Shizuoka Factory

Claims (4)

[Claims] 1. A closed container provided with a refrigerant discharge pipe,
An electric motor provided in the closed container, a fixed scroll provided with a scroll body and provided with a discharge hole for the compressed refrigerant, and fixed in the closed container, and the fixed scroll arranged so as to face the fixed scroll. A compression mechanism, which comprises an orbiting scroll provided with a spiral body that meshes with the scroll, and is engaged with the rotary shaft of the electric motor; A plurality of compression chambers formed between the two, which are gradually contracted from the outer side to the inner side to achieve a compression action; Revolving joint means, and the scroll provided in either of the above, and the scroll is changed in either the axial direction of the rotary shaft or the direction orthogonal to the rotary shaft with respect to the rotary shaft. And a relief mechanism that can be held,
A scroll compressor provided with the temperature detection means provided in the outer surface of the said airtight container, and arrange | positioned at the said electric motor corresponding position. 2. A closed container provided with a refrigerant discharge pipe,
An electric motor provided in the closed container, a fixed scroll provided with a scroll body and provided with a discharge hole for the compressed refrigerant, and fixed in the closed container, and the fixed scroll arranged so as to face the fixed scroll. A compression mechanism, which comprises an orbiting scroll provided with a spiral body that meshes with the scroll, and is engaged with the rotary shaft of the electric motor; A plurality of compression chambers formed between the two, which are gradually contracted from the outer side to the inner side to achieve a compression action; Revolving joint means, and the scroll provided in either of the above, and the scroll is changed in either the axial direction of the rotary shaft or the direction orthogonal to the rotary shaft with respect to the rotary shaft. And a relief mechanism that can be held,
A temperature detecting means provided on the outer surface of the closed container and arranged at a position corresponding to the electric motor communicates with a discharge pressure space and a suction pressure space of the closed container when the fixed scroll is provided and a predetermined temperature is exceeded. A scroll compressor equipped with a bypass mechanism. 3. A closed container provided with a refrigerant discharge pipe,
An electric motor provided in the closed container, a fixed scroll provided with a scroll body and provided with a discharge hole for the compressed refrigerant, and fixed in the closed container, and the fixed scroll arranged so as to face the fixed scroll. A compression mechanism, which comprises an orbiting scroll provided with a spiral body that meshes with the scroll, and is engaged with the rotary shaft of the electric motor; A plurality of compression chambers formed between the two, which are gradually contracted from the outer side to the inner side to achieve a compression action; Revolving joint means, and the scroll provided in either of the above, and the scroll is changed in either the axial direction of the rotary shaft or the direction orthogonal to the rotary shaft with respect to the rotary shaft. And a relief mechanism that can be held,
Temperature detection means provided on the outer surface of the closed container and arranged at the position corresponding to the electric motor, and a temperature provided on the discharge pipe to detect the temperature, and a change amount of the electric motor current flowing at the start of operation of the electric motor and the discharge. A scroll compressor comprising: a temperature detection element, which is used to determine whether or not to continue the operation of the electric motor based on the change amounts of both the pipe temperature changes detected at the same time. 4. A closed container provided with a refrigerant discharge pipe,
An electric motor provided in the closed container, a fixed scroll provided with a spiral body and provided with a discharge hole for the compressed refrigerant, and fixed in the closed container, and the fixed scroll arranged to face the fixed scroll. A compression mechanism, which comprises an orbiting scroll provided with a spiral body that meshes with the scroll, and is engaged with the rotary shaft of the electric motor, and the orbiting scroll is orbited with respect to the fixed scroll, and the fixed scroll and the orbiting scroll. A plurality of compression chambers formed between the two, which are gradually contracted from the outer side to the inner side to achieve a compression action; Revolving joint means, and the scroll provided in either of the above, and the scroll is changed in either the axial direction of the rotary shaft or the direction orthogonal to the rotary shaft with respect to the rotary shaft. And a relief mechanism that can be held,
Temperature detecting means provided on the outer surface of the closed container and arranged at the position corresponding to the electric motor, and temperature provided on the discharge pipe to detect the temperature, and the electric motor is controlled by an inverter driving device with a variable operating frequency to operate the electric motor. A temperature sensing element provided for operating frequency setting of the electric motor by the change amounts of both of the electric motor current and the discharge pipe temperature detected at the same time by detecting both the change amount of the discharge pipe temperature at the start. Equipped scroll compressor.