JP2000104683A - Scroll compressor and refrigerating circuit therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a compression efficiency from being degraded caused by the degradation of a suction efficiency for refrigerant to a compressor. SOLUTION: A stationary scroll and a movable scroll are formed out of mirror finished end plates, and of spiral shaped laps 12 and 22 erected over the end plates, and the respective laps 12 and 22 are so disposed as to allow them to abut against the end plates 11 and 21 of the opposite scrolls, and a space enclosed by the members is thereby formed into a compression chamber 43. In this case, refrigerant supplementing ports 55 are provided in a symmertical form while being penetrated through the end plate of the stationary scroll 10, so that refrigerant can thereby be directly supplemented to the compression chamber 43 from the outside. By this constitution, a compression efficiency can thereby be prevented from being degraded caused by the degradation of a suction efficiency for refrigerant to the compression chamber 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor capable of adjusting the amount of refrigerant compressed in a compression chamber and a refrigeration circuit using the same.

[0002]

2. Description of the Related Art Today, scroll compressors are used in refrigeration circuits of air conditioners and the like. Configuration examples of such a refrigeration circuit and a scroll compressor are shown in FIGS. 5 and 6, respectively.

The refrigeration circuit shown in FIG. 5 includes a scroll compressor 100, an indoor heat exchanger 101 for exchanging heat between refrigerant and room air, a decompressor 102, an outdoor heat exchanger 103 for exchanging heat between refrigerant and outside air, a scroll. It has a gas-liquid separator 104 for supplying only the gaseous refrigerant to the compressor 100, a four-way switching valve 105 for switching the circulation path of the refrigerant, and the like.

During the cooling operation, the refrigerant circulates sequentially through the scroll compressor 100, the outdoor heat exchanger 103, the pressure reducer 102, the indoor heat exchanger 101, and the gas-liquid separator 104, as indicated by the dotted arrows in FIG. 4-way switching valve 10
5 switches the circulation path.

[0005] Thus, the compressed refrigerant from the scroll compressor 100 exchanges heat with the outside air in the outdoor heat exchanger 103 to be condensed, and is decompressed or throttled by the decompressor 102 and supplied to the indoor heat exchanger 101. The indoor air is cooled by evaporation in the indoor heat exchanger 101. Thereafter, the flow returns to the scroll compressor 100 via the gas-liquid separator 104.

On the other hand, during the heating operation, the refrigerant sequentially circulates through the scroll compressor 100, the indoor heat exchanger 101, the decompressor 102, the outdoor heat exchanger 103, and the gas-liquid separator 104, in the direction of the solid arrow shown in FIG. 4-way switching valve 10
5 switches the circulation path.

[0007] Thus, the compressed refrigerant from the scroll compressor 100 exchanges heat with the indoor air by the indoor heat exchanger 101 to be condensed, and the room is heated.

Thereafter, the refrigerant is decompressed or throttled by the decompressor 102, supplied to the outdoor heat exchanger 103, evaporates by exchanging heat with the outside air, and returns to the scroll compressor 100 via the gas-liquid separator 104.

On the other hand, a scroll compressor 100 shown in FIG.
Has a fixed scroll 110, a movable scroll 120, a motor 130 for revolving the movable scroll 120 with respect to the fixed scroll 110, and the like, which are housed in a sealed case 140.

The closed case 140 is roughly divided into an upper space 141 and a lower space 142 by the fixed scroll 110 and the movable scroll 120.
The lower space 142 is communicated with the lower space 142 through a communication hole 143, and a motor 130 is provided in the lower space 142 so that the movable scroll 120 receives power via a shaft 131.

The fixed scroll 110 and the movable scroll 120 include mirror-finished mirror plates 111 and 121 and a spiral wrap 11 erected on the mirror plates 111 and 121.
2 and 122, and each wrap 112 and 122
Are arranged so as to be in contact with the mirror surface of the opposed scroll, and the space closed by these forms a compression chamber 143.

The movable scroll 120 is provided eccentrically with respect to the fixed scroll 110 and is configured to revolve by the power of a motor 130, whereby the compression chamber 143 is reduced and the refrigerant is compressed.

In such a configuration, the refrigerant is supplied to the intake pipe 1 fixed to the end plate 111 of the fixed scroll 110.
The air is sucked into the compression chamber 143 through the outlet 50 and is compressed as the compression chamber 143 is reduced.
Is discharged.

Thereafter, the refrigerant discharged into the upper space 141 flows into the lower space 142 through the communication hole 143, and is discharged from the lower space 142 to the outside through the discharge pipe 152.

[0015]

However, in the scroll compressor 100 having the above structure, when the temperature of the refrigerant supplied from the intake pipe 150 becomes low, or when the scroll compressor 100 is controlled by an inverter, the scroll compressor 100 is operated at high speed. In some cases, there is a problem that the suction efficiency of the refrigerant is reduced.

This occurs for the following reasons. That is,
As described above, the movable scroll 120 revolves with respect to the fixed scroll 110, and the wrap 112 of the fixed scroll 110 and the wrap 122 of the movable scroll 120 are closed to form a compression chamber.

However, since the revolving direction of the orbiting scroll 120 is a direction of escaping from the intake pipe 150, during high-speed operation in which the inflow speed of the refrigerant supplied from the intake pipe 150 is lower than the orbiting speed of the orbiting scroll 120,
The compression chamber 143 is formed in a state where the refrigerant is not sufficiently supplied.

When the temperature of the refrigerant supplied from the intake pipe 150 is low, the suction efficiency is reduced basically by the same principle, but in this case, it can occur even during high-speed operation. It is a target.

That is, a decrease in the temperature of the refrigerant supplied from the intake pipe 150 means that the pressure in the intake pipe 150 decreases. Therefore, the movable scroll 12
Even if the revolution speed of 0 is not high, the intake pipe 1
When the pressure of 50 decreases, the inflow speed of the refrigerant decreases, and the above-described phenomenon occurs.

Due to such a decrease in refrigerant suction efficiency,
The amount of refrigerant compressed in one cycle is reduced, and when such a compressor is used in an air conditioner or the like, it appears as a decrease in refrigeration efficiency.

Therefore, the present invention provides a method for compressing a refrigerant even when the suction efficiency is reduced such as when the temperature of the refrigerant supplied from the intake pipe is lowered or when the scroll compressor is operated at a high speed by inverter control. It is an object of the present invention to provide a scroll compressor in which the discharged refrigerant amount is not reduced.

[0022]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a fixed scroll and a movable scroll each having a spiral wrap formed on a head plate.
Each wrap is arranged so as to abut against the other end plate, and a compression chamber is formed by the space closed by these wraps, and the movable scroll revolves with respect to the fixed scroll to compress the refrigerant in the compression chamber. In a scroll compressor having a compression element, a refrigerant is separately supplied to a compression chamber, and a refrigerant replenishing means for increasing a refrigerant amount in the compression chamber is provided. It is characterized in that the amount of compressed refrigerant is not reduced even when the machine is operated at high speed by inverter control.

According to a second aspect of the present invention, the refrigerant supply means is constituted by a refrigerant supply port provided through the end plate of the fixed scroll so that the refrigerant is directly supplied from outside to the compression chamber. It is characterized in that the amount of compressed refrigerant is not reduced even when the temperature of the refrigerant supplied from the outside becomes low or when the compressor is operated at high speed by inverter control.

According to a third aspect of the present invention, the refrigerant supply port is closed by the wrap of the fixed scroll until immediately before the formation of the compression chamber, the supply of refrigerant from the refrigerant supply port is interrupted, and immediately after the compression chamber is formed. The refrigerant replenishment port is closed at the position where the refrigerant replenishment port is closed by the wrap of the fixed scroll and the refrigerant is supplied to the compression chamber, so that the temperature of the refrigerant efficiently supplied from the outside is reduced. The compressor is characterized in that the amount of compressed refrigerant is not reduced even when the compressor is operated at a high speed by inverter control.

According to a fourth aspect of the present invention, when the pressure of the compression chamber reaches a predetermined pressure in the compression process, the pressure is not increased to prevent the refrigerant from being over-compressed. It is characterized in that compression prevention means is provided to enable efficient compression.

According to a fifth aspect of the present invention, the overcompression preventing means has a pressure adjusting port provided through the end plate of the fixed scroll, and the refrigerant replenishing port communicates with the compression chamber prior to the pressure adjusting port. In this way, the amount of the compressed refrigerant is not reduced even when the temperature of the refrigerant efficiently supplied from the outside becomes low or when the compressor is operated at a high speed by inverter control. I do.

The invention according to claim 6 is the invention according to claims 1 to 5
A scroll compressor according to any one of the preceding claims, a condenser for condensing the refrigerant compressed by the scroll compressor, and a first and second decompressor for decompressing the refrigerant from the condenser. A gas extractor disposed between the first pressure reducer and the second pressure reducer for extracting a gaseous refrigerant among the circulating refrigerant, and refrigerating the refrigerant extracted by the gas extractor into a scroll compressor. A scroll compressor, a condenser, a first decompressor, a bleeder, and a second decompressor having a refrigerant replenishment controller for controlling whether or not the refrigerant is supplied to the means, and an evaporator for evaporating the refrigerant from the decompression device. The evaporator is connected in a ring to the pipe, and the bleeder and the refrigerant replenishing means of the scroll compressor are connected in a pipe, and a refrigerant replenishment controller is provided in the pipe so that the temperature of the refrigerant supplied from outside the apparatus is low. Or high speed operation by inverter control of the compressor Also to avoid compressed refrigerant amount is small in the case or the like, characterized thereby that it has prevented a drop or the like of the refrigerating capacity with a simple configuration.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a scroll compressor 1 according to the present invention.
FIG.

The scroll compressor 1 has a fixed scroll 1
0, a movable scroll 20, a motor 30 for revolving the movable scroll 20, and the like, which are housed in a sealed case 40.

The closed case 40 is partitioned into an upper space 41 and a lower space 42 by the fixed scroll 10, the movable scroll 20, the frame 60, and the like.
1 and the lower space 42 communicate with each other through a communication hole 43, and the motor 30 is disposed in the lower space 42.

Fixed scroll 10 and movable scroll 2
0 denotes mirror-finished mirror plates 11 and 21;
And spiral wraps 12 and 22 erected on the scroll end plates 1 and 21 respectively.
The compression chamber 43 is disposed so as to be in contact with the compression chambers 1 and 21 and is closed by these components.

As shown in FIG. 2, a discharge port 51 through which compressed refrigerant is discharged is provided through the center of the end plate 11 of the fixed scroll 10, and an intake pipe 150 is inserted into a peripheral portion thereof. An intake port 53 is provided.

The end plate 1 of the fixed scroll 10
An arc-shaped coolant supply groove 54 communicating with the intake port 53 is formed on the surface on which the one wrap 12 is formed. Generally, since a plurality of compression chambers 43 in the scroll compressor 1 are formed symmetrically with respect to the central axis, each compression chamber 43 is formed.
3 serves to guide the coolant to a position where the coolant supply groove 54 faces the coolant supply channel.

Further, a refrigerant replenishing port 55 (refrigerant replenishing means) is provided symmetrically through the end plate 11 of the fixed scroll 10, and a pressure adjusting port 56 is provided at a position substantially perpendicular to the refrigerant replenishing port 55.

The refrigerant supply port 55 is provided for supplying a refrigerant to the compression chamber 43 during compression. Also,
The pressure adjustment port 56 prevents the refrigerant from being over-compressed by opening the over-compression prevention valve 57 that closes the pressure adjustment port 56 when the pressure in the compression chamber 43 reaches a predetermined pressure.

By providing such a refrigerant replenishing port 55, even if the temperature of the refrigerant supplied from the intake pipe 150 becomes low or the scroll compressor 1 is controlled at an inverter and operated at a high speed, the refrigerant is compressed. It is possible to prevent the amount of the discharged refrigerant from decreasing.

Needless to say, even if the above-described intake efficiency of the refrigerant does not decrease, more refrigerant can be supplied.
Even the scroll compressor 1 having a small compression capacity can exhibit a large compression capacity.

In order to efficiently supply the refrigerant to the compression chamber 43, it is preferable that the pressure in the compression chamber 43 at the time of supply is low. Further, after the pressure adjusting port 56, the refrigerant replenishing port 5
5 communicates with the compression chamber 43, the pressure adjustment port 5
There is no point in adjusting the pressure in step 6.

From such a viewpoint, the position where the refrigerant replenishment port 55 is formed is such that the pressure immediately after the formation of the compression chamber 43 is relatively low and the compression chamber 43 which is not in communication with the pressure adjustment port 56 is formed.
The position which communicates with is preferred. The specific position will be described later.

An Oldham ring 61 is provided between the movable scroll 20 and the frame 60. On the upper surface of the Oldham ring 61, two keys 62 (only one is shown in FIG. 1) are provided to face each other.
Keys 63 (only one is shown in FIG. 1) are provided to face each other, and a straight line connecting the two keys 62 and two keys 6
3 is orthogonal to the straight line.

The key 62 is fitted in a key groove 64 provided in the movable scroll 20, and the key 63 is fitted in a key groove 65 provided in the frame 60.

The shaft 31 has a lubricant passage 32 formed therein and a crank portion 33 provided at an upper end thereof. The crank portion 33 is inserted into a shaft engaging portion 23 formed on the movable scroll 20. Have been. The upper end of the shaft 31 is supported by the frame 60, and the lower end is rotatably supported by the bearing plate 35, and is rotated by the motor 30.

A lubricant 36 is stored at the bottom of the closed case 40. The lubricant 36 is pushed by the pressure of the lower space 42 and passes through the lubricant passage 32 through the movable scroll 20.
It is supplied to the sliding surfaces of the movable scroll 20 and the fixed scroll 10 while lubricating the sliding surfaces of the movable scroll 20 and the fixed scroll 10.

When the shaft 31 rotates in such a configuration, the Oldham ring 61 and the movable scroll 20 move relative to each other, and the movable scroll 20 revolves with respect to the fixed scroll 10.

The movable scroll 20 is the fixed scroll 10
, The compression chamber 43 contracts while taking in the refrigerant supplied through the intake pipe 50, compresses the refrigerant, and discharges the upper space 4 from the discharge port 51.
Discharge to 1.

Next, a process of replenishing the compression chamber 43 with the refrigerant and a process of preventing over-compression will be described with reference to FIG.

FIG. 3 is a diagram showing the movement of the fixed scroll 10 and the movable scroll 120 during the compression process over one cycle. In FIG. 3, the state in the course of the process is indicated by 、, the wrap 12 of the fixed scroll 10 is hatched, and the region of the refrigerant of interest is indicated by “•”.

First, in FIG. 3, the refrigerant is sucked in from the intake pipe 50 in accordance with the movement of the orbiting scroll 20, and the state shown in FIG. In this state, the compression chamber 43 is not formed, and the refrigerant replenishment port 55 is closed by the wrap 22 of the movable scroll 20. Therefore, even if an attempt is made to replenish the refrigerant in this state, the refrigerant is not replenished.

In this state, the compression chamber 43 is formed, and the refrigerant supply port 55 is opened. At this time, the pressure in the compression chamber 43 is substantially equal to the pressure of the refrigerant sucked from the suction pipe 50, so that the refrigerant can be easily replenished.

In the state described above, the refrigerant supply port 55 is closed by the wrap 22 of the orbiting scroll 20, and the state shifts to the state after the refrigerant supply is completed.

In the state (1), the compression chamber 43 is
Communicate with 6. When the refrigerant is over-compressed by this, the pressure is adjusted by opening the over-compression prevention valve 57, and the state goes through the state. In this state, the compressed refrigerant is discharged from the discharge port 51.

The discharged refrigerant flows into the lower space 42 through the communication hole 43, and is discharged out of the machine through the discharge pipe 52 therefrom.

Next, the configuration of a refrigeration circuit when the scroll compressor 1 having such a configuration is applied to an air conditioner will be described.

As shown in FIG. 4, the refrigerating circuit 80 includes a scroll compressor 1, an indoor heat exchanger 81 for exchanging heat between refrigerant and indoor air, and an electric solenoid valve for reducing the pressure of the refrigerant. A decompression device including a first decompressor 83 and a second decompressor 82; a first decompressor 83 and a second decompressor 82;
, An outdoor heat exchanger 85 for exchanging heat between the refrigerant and outside air, and only a gaseous refrigerant is supplied to the scroll compressor 1. A gas-liquid separator 86, a four-way switching valve 87 for switching the circulation path of the refrigerant, and a pipe 88 connecting the extractor 84 and the scroll compressor 1 are provided in the middle of the extractor 84.
Replenishment controller 89 constituted by an electromagnetic valve or the like for controlling whether or not the refrigerant from the compressor is supplied to the scroll compressor 1
Etc.

During the cooling operation, the first decompressor 83 acts as a decompressor to throttle the refrigerant, but the second depressurizer 82 is fully opened and controlled so as not to throttle the refrigerant. on the other hand,
During the heating operation, the first decompressor 83 is fully opened so that the refrigerant is not restricted, and the second decompressor 82 is controlled to act as a decompressor and restrict the refrigerant.

Of course, the first pressure reducer 83 and the second pressure reducer 82
Can be adjusted, and in this case, it is preferable that the degree of opening and closing can be appropriately set or controlled according to the refrigeration efficiency and the like.

During the cooling operation, the refrigerant is supplied to the scroll compressor 1, the outdoor heat exchanger 85 (acting as a condenser), the first decompressor 83, the bleeder 84, the second decompressor 82,
The indoor heat exchanger 81 (acting as an evaporator) and the gas-liquid separator 86 are sequentially circulated, and the four-way switching valve 87 switches the circulation path so as to flow in the direction of the dotted arrow shown in FIG.

Thus, the compressed refrigerant from the scroll compressor 1 exchanges heat with the outside air by the outdoor heat exchanger 85 to be condensed, and is decompressed or throttled by the first decompressor 83 and supplied to the extractor 84. You.

At this time, if it is desired to increase the amount of refrigerant discharged from the scroll compressor 1, the refrigerant replenishment controller 89 opens the valve and the gas refrigerant extracted by the extractor 84 is supplied to the compression chamber 43. Will be done.

The gas extractor 84 has substantially the same basic operating principle as the gas-liquid separator 86, and extracts gaseous refrigerant from the supplied refrigerant. At this time, if the pressure in the compression chamber 43 is high (depending on the position where the refrigerant replenishment port 55 is formed), a situation occurs in which the refrigerant in the compression chamber 43 flows back to the bleeder 84.

To prevent such a situation, the degree of opening of the refrigerant replenishment controller 89 is adjusted to increase the pressure of the refrigerant from the bleeder 84. Of course, it is preferable that the refrigerant replenishment controller 89 has a check valve structure so that the above-mentioned backflow does not occur even if the pressure of the bleeder 84 becomes lower than the pressure of the compression chamber 43.

Then, the liquid refrigerant from the bleeder 84 passes through the second decompressor 82 and is supplied to the indoor heat exchanger 81,
The indoor air is cooled by evaporation in the indoor heat exchanger 81. Thereafter, the flow returns to the scroll compressor 1 via the gas-liquid separator 86.

On the other hand, during the heating operation, the refrigerant is supplied to the scroll compressor 1, the indoor heat exchanger 81 (acting as a condenser), the second decompressor 82, the bleeder 84, the first decompressor 83,
The four-way switching valve 87 switches the circulation path so that the outdoor heat exchanger 85 (acting as an evaporator) and the gas-liquid separator 86 are sequentially circulated and flow in the direction of the solid line arrow shown in FIG.

Thus, the compressed refrigerant from the scroll compressor 1 exchanges heat with the indoor air by the indoor heat exchanger 81 and condenses, thereby heating the room.

Thereafter, the refrigerant is decompressed or throttled by the second decompressor 82 and supplied to the bleeder 84. In a case where the amount of refrigerant discharged from the scroll compressor 1 is to be increased as in the cooling operation, Then, the refrigerant replenishment controller 89 is opened, and the gas refrigerant extracted by the bleeder 84 is supplied to the compression chamber 43.

The refrigerant passes through the first decompressor 83, is supplied to the outdoor heat exchanger 85, and evaporates by exchanging heat with the outside air. Thereafter, the refrigerant returns to the scroll compressor 1 via the gas-liquid separator 86.

In the above description, the pressure adjusting port 56 is provided to prevent the refrigerant from being over-compressed. However, the present invention is not limited to this, and the scroll compressor 1 having no such pressure adjusting port 56 can be used. There may be.

[0068]

As described above, according to the first aspect of the present invention, the refrigerant is separately supplied to the compression chamber, and the refrigerant replenishing means for increasing the amount of refrigerant in the compression chamber is provided. Even when the temperature of the refrigerant to be cooled is low, or when the compressor is operated at a high speed by inverter control, the amount of the compressed refrigerant can be kept from decreasing.

According to the second aspect of the present invention, the refrigerant replenishment means is constituted by a refrigerant replenishment port provided through the end plate of the fixed scroll so that the refrigerant is directly supplied from outside the machine to the compression chamber. With such a configuration, even when the temperature of the refrigerant supplied from the outside becomes low, or when the compressor is operated at a high speed by inverter control, the amount of the compressed refrigerant can be kept from decreasing.

According to a third aspect of the present invention, the refrigerant supply port is closed by the wrap of the fixed scroll and the supply of the refrigerant from the refrigerant supply port is interrupted until immediately before the compression chamber is formed. When the refrigerant supply port is formed so that the refrigerant supply port is formed by releasing the blockage of the refrigerant supply port by the wrap of the fixed scroll so that the refrigerant is supplied to the compression chamber, when the temperature of the refrigerant supplied from outside the machine becomes low efficiently It is also possible to prevent the amount of compressed refrigerant from being reduced even when the compressor is operated at high speed by inverter control.

According to the fourth aspect of the present invention, since the over-compression preventing means for preventing over-compression is provided, the refrigerant can be efficiently compressed.

According to the fifth aspect of the present invention, since the refrigerant replenishment port communicates with the compression chamber prior to the pressure adjustment port, even if the refrigerant is replenished into the compression chamber, overcompression is not prevented, and the efficiency is improved. It is possible to compress the refrigerant.

In the invention according to claim 6, since the refrigeration circuit is configured to supply the refrigerant extracted by the bleeder to the compression chamber from the refrigerant supply port, the temperature of the refrigerant supplied to the scroll compressor is reduced. In the case and when the scroll compressor is operated at a high speed by inverter control, the amount of the compressed refrigerant can be prevented from decreasing, and the refrigeration efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor applied to the description of an embodiment of the present invention.

FIG. 2 is a front view of a fixed scroll.

FIG. 3 is a diagram illustrating a compression process.

FIG. 4 is a refrigeration circuit diagram to which the scroll compressor of FIG. 1 is applied.

FIG. 5 is a refrigeration circuit diagram applied to the description of the conventional technique.

FIG. 6 is a longitudinal sectional view of a scroll compressor applied to the description of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll compressor 10 Fixed scroll 11 and 21 End plate 12 and 22 Lapping 43 Compression chamber 55 Refrigerant replenishing port 56 Pressure adjusting port 57 Overcompression prevention valve 80 Refrigeration circuit 81 Indoor heat exchanger 82 Second decompressor 83 First decompressor 84 Extractor 85 Outdoor heat exchanger 88 Piping 89 Refrigerant replenishment controller

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takehiro Nishikawa 2-5-1-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takashi Sato 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H039 AA03 AA06 AA12 BB17 BB28 CC05 CC08 CC26 CC28

Claims (6)

[Claims] 1. A fixed scroll and a movable scroll, each having a spiral wrap formed on a head plate, are disposed so that each wrap abuts on the other end plate, and a compression chamber is formed by a space closed by these wraps. A scroll compressor having a compression element for compressing the refrigerant in the compression chamber by the orbital movement of the movable scroll with respect to the fixed scroll, wherein a refrigerant is separately supplied to the compression chamber, A scroll compressor having a refrigerant replenishing means for increasing the amount of refrigerant. 2. The refrigerant replenishing means has a refrigerant replenishing port provided through the end plate of the fixed scroll to supply refrigerant directly from outside the machine to the compression chamber. Scroll compressor. 3. The refrigerant replenishing port is closed by a wrap of the fixed scroll until immediately before the formation of the compression chamber, so that the supply of refrigerant from the refrigerant replenishment port is interrupted and immediately after the compression chamber is formed. 3. The pressure control device according to claim 1, wherein the fixed scroll is formed at a position where the blockage of the fixed scroll is released and the refrigerant is supplied to the compression chamber.
The scroll compressor as described. 4. An over-compression preventing means for preventing a refrigerant from being over-compressed by preventing the pressure from exceeding the predetermined pressure when the pressure in the compression chamber reaches a predetermined pressure in a compression process. The scroll compressor according to any one of claims 1 to 3, wherein: 5. The over-compression preventing means has a pressure adjusting port provided through the end plate of the fixed scroll, and the refrigerant replenishing port communicates with the compression chamber prior to the pressure adjusting port. The scroll compressor according to claim 4, wherein 6. A scroll compressor according to any one of claims 1 to 5, a condenser for condensing the refrigerant compressed by the scroll compressor, and a first decompressor for decompressing the refrigerant from the condenser. And a decompression device including a second decompression device; an extraction device disposed between the first and second decompression devices to extract a gaseous refrigerant among the circulating refrigerant; A refrigerant replenishment controller that controls whether to supply the extracted refrigerant to refrigerant replenishment means of the scroll compressor, and an evaporator that evaporates the refrigerant from the pressure reducing device. Vessel, first decompressor, bleeder,
A second decompressor and an evaporator are connected in a ring to the pipe, and the bleeder and the refrigerant replenishing means of the scroll compressor are connected in a pipe, and the pipe is provided with the refrigerant replenishment controller. And refrigeration circuit.