JPH07139820A - Refrigerating equipment - Google Patents

Abstract

PURPOSE:To prevent occurrence of liquid compression or an oil rise on the compression element part side while cooling a motor part excellently, by a method wherein a necessary quantity of liquid refrigerant corresponding to the state of operation of a compressor is injected into the motor part. CONSTITUTION:A flow regulating valve 6 is interposed in a liquid injection passage 5 provided between the outlet side of a condenser 2 and a motor part 1A, while a current detector 7 detecting a current value of the motor part 1A and a flow controller 8 regulating a valve opening of the flow regulating valve 6 in accordance with a detected current value of the current detector 7 are provided. When a compressor 1 having a capacity control device is used, a capacity detector 9, detecting a capacity control value of the capacity control device and a flow controller regulating the valve opening of the flow regulating valve 6 in accordance with a detected capacity value of this capacity detector are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus, and more particularly, it has a compressor having a motor section and a compression element section, a condenser and an evaporator, and the liquid refrigerant on the outlet side of the condenser is supplied to the motor. The present invention relates to a refrigerating apparatus in which a refrigerant cooled by a motor is returned to the compression process of the compression element section.

[0002]

2. Description of the Related Art Conventionally, a refrigerating apparatus of this type is disclosed in, for example, Japanese Utility Model Laid-Open No. 57-121869 and, as shown in FIG. 6, a compressor having a motor section A1 and a compression element section A2. A condenser C, an expansion valve D and an evaporator E are connected to a refrigerant discharge side of A via a refrigerant pipe B, and an outlet side of the condenser C in the refrigerant pipe B and the motor unit A.
1, a liquid injection passage F is provided, and a return pipe H having a cooler G is provided between the motor portion A1 and the compression element portion A2. Then, during the refrigerating operation, a part of the liquid refrigerant from the condenser C to the expansion valve D is injected from the liquid injection passage F into the motor unit A1 to cool the motor unit A1, and the motor unit A1 is cooled. While cooling the refrigerant in the cooler G after the cooling of A1, the compression element part A from the return pipe H is cooled.
It returns to the compression process of 2.

[0003]

However, in the above refrigeration system, for example, a capacity control device is provided in the compression element portion A2 of the compressor A, and the part load operation of the compressor A is performed by the capacity control device. In such a case, if the high and low differential pressure between the outlet side of the condenser B and the motor unit A1 is the same as during full load operation, the same amount of liquid refrigerant as during full load operation is applied to the motor. Since the injection is performed on the part A1 side, the following problems occur. That is, during full-load operation of the compressor A, the load of the motor unit A1 becomes large and the motor unit A1 generates heat at a high temperature. Therefore, a large amount of liquid refrigerant is used to cool the motor unit A1. On the other hand, in the part load operation, the load of the motor unit A1 becomes smaller and the amount of heat generation becomes smaller than in the case of performing the full load operation.
The amount of liquid refrigerant required to cool the motor unit A1 is smaller than that during full load operation. However, as described above, during part load operation, a large amount of liquid refrigerant is used as in full load operation. When the motor portion A1 is injected, a large amount of liquid refrigerant is not gasified in the motor portion A1 and a large amount of liquid refrigerant is compressed into the compression element portion A1.
Therefore, the liquid may be compressed on the side of the compression element portion A2, and the compression element portion A2 may be compressed.
Since the discharge gas that is compressed by and is discharged to the outside becomes wet, the liquid component of this discharge gas is
2 is mixed with the oil in the oil reservoir provided on the discharge side, the oil concentration in the oil reservoir becomes low, and accordingly, the amount of oil supplied from the oil reservoir to the compression element portion A2 becomes small. In some cases, oil was spilled on the compression element portion A2 side.

The present invention has been made in view of the above problems, and an object thereof is to inject an amount of liquid refrigerant into a motor portion according to an operating state of a compressor to stabilize the motor portion. (EN) A refrigerating device that can be cooled well, and that can reliably prevent liquid compression on the compression element side and oil discharge due to discharge gas becoming wet. To do.

[0005]

In order to achieve the above object, the invention according to claim 1 is a compressor 1 having a motor portion 1A and a compression element portion 1B driven by the motor portion 1A.
And a condenser 2 and an evaporator 4, and the liquid refrigerant on the outlet side of the condenser 2 is injected into the motor section 1A, and the refrigerant after cooling the motor is returned to the compression process of the compression element section 1B. In the refrigeration system, a flow rate adjusting valve 6 is provided in a liquid injection passage 5 provided between the outlet side of the condenser 2 and the motor unit 1A, and a current detector 7 for detecting the current value of the motor unit 1A. And a flow rate controller 8 for adjusting the valve opening degree of the flow rate adjusting valve 6 according to the detected current value of the current detector 7.

The invention according to claim 2 is that the motor unit 1
A compressor 1 having A and a compression element portion 1B driven by the motor portion 1A, the compression element portion 1B having a capacity control device 20, a condenser 2 and an evaporator 4 are provided. In the refrigerating apparatus in which the liquid refrigerant on the outlet side of the condenser 2 is injected into the motor section 1A and the refrigerant after the motor is cooled is returned to the compression process of the compression element section 1B, the outlet side of the condenser 2 and the motor section 1A. A flow rate adjusting valve 6 is provided in a liquid injection passage 5 provided between the capacity detector 9 and a capacity detector 9 for detecting a capacity control value of the capacity controller 20, and a capacity detector 9 detects a capacity value of the capacity detector 9. A flow rate controller 10 for adjusting the valve opening of the flow rate adjusting valve 6 is provided.

[0007]

According to the invention of claim 1, the current value of the motor section 1A is detected by the current detector 7 during the refrigerating operation,
Based on this detected current value, the valve opening degree of the flow rate adjusting valve 6 is adjusted via the flow rate controller 8, and the liquid refrigerant corresponding to the valve opening degree of the flow rate adjusting valve 6 is the refrigerant outlet side of the condenser 2. Through the liquid injection passage 5 to the motor unit 1A
That is, the current value that changes according to the load of the motor unit 1A is detected by the current detector 7, and the amount of liquid refrigerant corresponding to this current value is supplied to the motor unit 1A. Since the injection can be performed, the motor unit 1A can be cooled well, and even if the load of the motor unit 1A is small and the amount of heat generation is small, the injection amount from the liquid injection passage 5 can be adjusted to a current value. The amount of the liquid refrigerant is gasified and returned to the compression process of the compression element part 1B as the motor part 1A is cooled. Cause compression,
As in the prior art, the discharge gas from the compression element portion 1B is in a wet state, the liquid component of the discharge gas is mixed with the oil on the discharge side of the compression element portion 1B, and the oil concentration becomes low. Accordingly, the amount of oil supplied to the compression element portion 1B is reduced, and it is possible to prevent the oil from rising on the compression element portion 1B side.

According to the second aspect of the present invention, when the capacity control device 20 provided in the compression element portion 1B performs capacity control operation, the capacity control value of the capacity control device 20 is detected by the capacity detector 9. Based on this detected capacity value, the valve opening of the flow rate adjusting valve 6 is adjusted via the flow rate controller 10, and liquid refrigerant corresponding to capacity control is supplied from the refrigerant outlet side of the condenser 2 to the liquid injection passage. Therefore, the amount of the liquid refrigerant corresponding to the capacity control state of the capacity control device 20, that is, the operation state of the compressor 1 is injected into the motor unit 1A via the motor unit 1A.
Since the motor part 1A can be satisfactorily cooled, liquid compression occurs on the side of the compression element part 1B, and the discharge gas becomes wet and oil rises. The problem that occurs can be surely prevented.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a refrigeration cycle of a refrigerating machine. In the figure, reference numeral 1 is a screw type compressor, which comprises a motor section 1A and a compression element section 1B driven by the motor section 1A. , A gas-liquid separation section 1C for separating the discharge gas discharged from the compression element section 1B into a gas-liquid separation. The refrigerant discharge side of the gas-liquid separation section 1C is provided with a condenser 2 via a refrigerant pipe a. The expansion valve 3 and the evaporator 4 are connected to each other, and a liquid injection passage 5 communicating with the motor unit 1A is provided on the refrigerant outlet side of the condenser 2 in the refrigerant pipe a, and the liquid injection passage 5 is connected via the liquid injection passage 5. A part of the liquid refrigerant from the condenser 2 to the expansion valve 3 is used for the motor unit 1
By injecting into A, the motor unit 1
A is cooled, and after cooling the motor section 1A, the refrigerant is returned to the compression element section 1B side. Further, an oiling pipe b for supplying the oil separated by the gas-liquid separating section 1C to the compression element section 1B side is provided between the compression element section 1B and the gas-liquid separating section 1C. .

Therefore, in the first embodiment of the present invention, as shown in FIG.
As shown in FIG. 5, a flow rate adjusting valve 6 is provided in the liquid injection passage 5, and a current detector 7 for detecting a current value used by the motor unit 1A is connected to the motor unit 1A and the current detection is performed. A flow rate controller 8 for adjusting the valve opening of the flow rate adjusting valve 6 according to the detected current value is connected to the device 7.

During the freezing operation, the current detector 7 detects the current value of the motor unit 1A, that is, the load state of the motor unit 1A, and the flow rate control is performed based on the current value detected by the detector 7. By adjusting the valve opening degree of the flow rate adjusting valve 6 via the condenser 8, the liquid refrigerant corresponding to the load of the motor unit 1A is passed from the refrigerant outlet side of the condenser 2 through the liquid injection passage 5 to the motor. Part 1A
Inject it for cooling.

By doing so, the current value of the motor unit 1A detected by the current detector 7, that is, a necessary amount of liquid refrigerant corresponding to the load state (heat generation state) of the motor unit 1A is supplied to the motor unit. Since it can be injected into the portion 1A, the motor portion 1A can be satisfactorily cooled in accordance with its heat generation state, but even when the load of the motor portion 1A is small and the heat generation amount is small, Since the injection amount from the liquid injection passage 5 can be adjusted to a small amount according to the heat generation amount, the motor unit 1A
It is possible to gasify the entire amount of the supply liquid refrigerant with the cooling of and return to the compression process of the compression element part 1B.
It is possible to reliably prevent liquid compression from occurring on the compression element portion 1B side, and moreover, the refrigerant compressed by the compression element portion 1B is discharged in the gas state to the gas-liquid separation portion 1C side. As in the prior art, a wet refrigerant is discharged to the gas-liquid separation section 1C side to reduce the oil concentration in the oil bottom provided on the inner bottom side of the gas-liquid separation section 1C. It is also possible to prevent the amount of oil supplied to the compression element portion 1B side via the oil injection pipe b from being reduced, and it is possible to reliably prevent oil from rising on the compression element portion 1B side. it can.

Further, in the compressor 1 used in a large-scale refrigerating apparatus or the like, a current detector for detecting a current value of the motor unit 1A is usually provided for the purpose of protecting the motor unit 1A, A controller or the like for controlling the rotation of the motor unit 1A based on the output from the current detector is provided, and when the current value detected by the detector becomes a certain value or more, the controller controls the motor unit 1A. Output the signal,
In many cases, the motor unit 1A is designed to be loaded down. In this embodiment, the current detector and controller are used to adjust the flow rate adjusting valve 6 based on the current value used by the motor unit 1A. The valve opening may be adjusted. In such a case, it is possible to reliably prevent liquid compression or oil spill at the compression element portion 1B with a simple configuration that effectively uses equipment installed in advance.

Further, a second embodiment will be described with reference to FIG. In the second embodiment, the capacity control device 20 is provided in the compression element portion 1B of the compressor 1, and the other parts are the same as those in the first embodiment described above.
In the refrigerating apparatus having the same configuration as that of the embodiment, the flow rate adjusting valve 6 is provided in the liquid injection passage 5 provided between the outlet side of the condenser 2 and the motor unit 1A, and
A capacity detector 9 for detecting a capacity control value of the capacity controller 20 is connected to the motor unit 1A, and the capacity detector 9
In addition, a flow rate controller 10 for adjusting the valve opening of the flow rate adjusting valve 6 according to the detected capacity value of the capacity detector 9 is connected.

Specifically, as shown in FIG. 2, two first and second branches are provided at an intermediate portion of the liquid injection passage 5 provided between the outlet side of the condenser 2 and the motor section 1A. In addition to providing the passages 51 and 52, as the flow rate adjusting valve 6, a first flow rate adjusting valve 61 that is opened when the compressor 1 is in operation and closed when the compressor 1 is not in operation, and the compressor 1
In the capacity control operation, for example, two second flow rate adjusting valves 62 that are opened during a load operation of 50% or more are used, and the first adjustment valve 61 is provided in the first branch passage 51 and the first branch passage 51. Two adjusting valves 62 are provided in the second branch passages 52, respectively.

More specifically, the capacity control device 20
As shown in FIG. 3, a plurality of slide valves 21 axially slidably provided around the outer periphery of the compression element 1E inside the casing 1D of the compression element portion 1B,
An operating body 22 that slides each of these slide valves 21
By adjusting the opening degree of each slide valve 21 with respect to the compression element 1E by the slide operation of the operation body 22, the capacity control operation by the compression element 1E is performed. A displacement detector 9 for detecting the slide amount of each slide valve 21 is interlockingly connected to the operating body 22 of the displacement control device 20, and the second flow rate adjusting valve 62 is connected to the displacement detector 9 according to its operation. The flow rate controller 10 to be opened and closed is interlocked.

As is apparent from FIGS. 3 to 5, the capacity detector 9 has a support 91 provided on the outer side of the casing 1D, which is radially inward and outward in a direction orthogonal to the sliding direction of each slide valve 21. Rotatable rod 92 supported toward
A bifurcated actuating plate 93 fixed to the shaft end of the shaft rod 92 on the inner side of the casing 1D, and a part of the operating body 22 protruding from and inserted into the bifurcated part of the actuating plate 93. Feedback pin 94, a controller cover 95 provided on the outside of the support 91, and the cover 9
5, a large-diameter first gear 96 fixed to the other end of the shaft rod 92 inside the cover 5, and the first gear 96 arranged inside the cover 95,
A small-diameter second gear 98 that is constantly meshed with the gear 96, a first cam surface 99a fixed to a rotating shaft 97 extending from the second gear 98, and an arcuate outer peripheral surface, and a flat second cam surface. It is composed of a cam plate 99 having 99b.

Further, the flow rate controller 10 is shown in FIGS.
As is clear from the above, the limit switch 10a for turning on and off the second flow rate adjusting valve 62 disposed inside the controller cover 95 is provided, and the limit switch 10a is provided with a limit switch 10a at the tip side thereof. The rolling roller 10c that rolls along the first and second cam surfaces 99a and 99b of the cam plate 99 is supported.

When each of the slide valves 21 is slid in the axial direction through the operating body 22, the slide of the operating body 22 causes the operating plate 93 through the feedback pin 94 and the solid line in FIG. And the shaft 92 is swung in the axial direction as indicated by the phantom line.
Is rotated by a predetermined angle to transmit the rotation amount of the shaft rod 92 from the large-diameter first gear 96 provided at the shaft end to the small-diameter second gear 98 as a large rotation amount, and the second gear The cam plate 99 is rotated by the rotation of the rotary shaft 97 extending from 98, and the first and second cam surfaces 99a and 99b of the cam plate 99 are rotated.
Is brought into contact with the rolling roller 10c provided on the operating piece 10b of the limit switch 10a, and when the rolling roller 10c comes into contact with the first cam surface 99a, that is, 50%.
During the above load operation, the operating piece 10b is pushed to turn on the limit switch 10a to open the second flow rate adjusting valve 62, while the rolling roller 10c moves to the second cam surface. When contacted with 99b, that is, when the load operation is less than 50%, the operating piece 10b is
The pushing operation force is released, the limit switch 10a is turned off, and the second flow rate adjusting valve 62 is closed.

Next, the operation of the second embodiment having the above structure will be described. First, when the refrigeration system is in operation, the first flow rate adjusting valve 61 provided in the first branch passage 51 of the liquid injection passage 5 is opened simultaneously with the start of operation, and the condenser is operated via the first flow rate adjusting valve 61. The liquid refrigerant on the 2 outlet side is injected into the motor unit 1A of the compressor 1, and the injection of the liquid refrigerant into the motor unit 1A is independent of the capacity control operation of the compressor 1 and It is always done when driving.

When the capacity control operation of the compressor 1 is carried out, the slide valves 21 provided on the outer periphery of the compression element 1E are slid by the operating body 22, and, for example, 50
%, The first cam surface 99a of the cam plate 99 is provided with the limit switch 10a along with the slide operation of each slide valve 21.
0b of the rolling roller 10c
The actuating piece 10b is pushed by c, the limit switch 10a is turned on, and the second flow rate adjusting valve 62 provided in the second branch passage 52 of the liquid injection passage 5 is opened accordingly. A large amount of liquid refrigerant is injected into the motor unit 1A from the second flow rate adjusting valve 62 and the first flow rate adjusting valve 61 that is normally opened during operation. Further, for example, when performing a load operation of less than 50%, the second cam surface 99b of the cam plate 99 is brought into contact with the rolling roller 10c of the operating piece 10b in accordance with the sliding operation of each slide valve 21, Actuating piece 10
The pushing operation force of b is released, the limit switch 10a is turned off accordingly, and the second flow rate adjusting valve 62 is released.
Is closed, liquid injection from the second flow rate adjusting valve 62 is not performed, and the first flow rate adjusting valve 6 is
Therefore, only the liquid injection into the motor section 1A by 1 is performed.

Therefore, the required amount of the liquid refrigerant corresponding to the opening state of each slide valve 21, that is, the capacity control operation state of the compression element portion 1B is set to the first amount adjustment valve 61 which is normally opened during the operation. , The motor unit 1A can be injected through the second flow rate adjusting valve 62 that is controlled to open / close depending on the opening degree of each slide valve 21, that is, the compression element unit 1B is loaded at, for example, 50% or more. In the case of operating, when the motor unit 1A has a high load and a large amount of heat is generated, the first and second flow rate adjusting valves 6
When a large amount of liquid refrigerant is injected into the motor unit 1A by the opening operation of Nos. 1 and 62, and when a low capacity operation is performed by, for example, a load operation of less than 50%, the motor unit 1A has a low load and generates a small amount of heat. In such a case, by closing the second flow rate adjusting valve 62 while keeping the first flow rate adjusting valve 61 open, a small amount of liquid refrigerant is injected into the motor unit 1A, Motor part 1A
Can be cooled stably and satisfactorily according to the load.
Moreover, when the compression element portion 1B is operating at a low capacity and the load of the motor portion 1A is small and the amount of heat generated is small, the second flow rate adjusting valve 62 is closed and the first flow rate adjusting valve 62 is closed. Since only 61 is opened, the amount of liquid injection from the liquid injection passage 5 to the motor unit 1A is adjusted to a small amount, so that as the motor unit 1A cools, the entire amount of the supplied liquid refrigerant is gasified and The compression element portion 1B can be returned to the compression element portion 1B. Therefore, as in the case of the first aspect of the invention described above, liquid compression occurs on the compression element portion 1B side, and the discharge gas becomes wet and the compression element portion It is possible to reliably prevent the oil from rising on the portion 1B side.

In the above embodiment, the flow rate adjusting valve 6
As the above, the first flow rate adjusting valve 61 that is opened during operation and closed when not operating and the second flow rate adjusting valve 62 that is opened and closed by adjusting the opening degree of each slide valve 21 are used. Then, as the flow rate adjusting valve 6, it is possible to use a valve whose opening degree is adjusted according to the opening adjustment amount of each slide valve 21. Furthermore, in the above embodiment, the two first and
Although the second flow rate adjusting valves 61 and 62 are provided,
According to the present invention, the liquid injection passage 5 is provided with two or more flow rate adjusting valves that are opened and closed during the capacity control operation of the compressor 1 over a plurality of stages, and the compressor is controlled by opening and closing the flow rate adjusting valves. The liquid refrigerant may be injected into the motor unit 1A side in multiple stages corresponding to the first capacity control operation state.

[0024]

As described above, according to the invention described in claim 1, the compressor 1 having the motor portion 1A and the compression element portion 1B, the condenser 2 and the evaporator 4 are provided. In the refrigerating apparatus in which the liquid refrigerant on the outlet side of the condenser 2 is injected into the motor section 1A and the refrigerant after the motor is cooled is returned to the compression process of the compression element section 1B, the outlet side of the condenser 2 and A flow rate adjusting valve 6 is provided in a liquid injection passage 5 provided between the motor unit 1A and
A current detector 7 for detecting the current value of the motor unit 1A,
The flow rate adjusting valve 6 according to the detected current value of the current detector 7.
Since the flow rate controller 8 for adjusting the valve opening degree of is provided, the current detector 7 detects the current value of the motor unit 1A, which is a motor load, and the flow rate controller 8 is used based on the detected current value. The valve opening of the flow rate adjusting valve 6 is adjusted to inject the liquid refrigerant corresponding to the load of the motor unit 1A into the motor unit 1A from the refrigerant outlet side of the condenser 2 through the liquid injection passage 5. Therefore, the current value of the motor unit 1A detected by the current detector 7, that is, an amount of liquid refrigerant corresponding to the load state of the motor unit 1A is injected into the motor unit 1A. As a result, the motor unit 1A can be cooled well, and even if the load of the motor unit 1A is small and the amount of heat generated is small, the liquid from the liquid injection passage 5 can be removed. Since the injection amount can be adjusted to a small amount, the entire amount of the liquid refrigerant can be gasified and returned to the compression process of the compression element part 1B as the motor part 1A is cooled. Liquid compression occurs on the side, or the discharge gas from this compression element portion 1B becomes wet as in the conventional case, and the compression element portion 1B
Since the amount of oil supplied to the
It is possible to prevent oil rising on the side.

According to the second aspect of the present invention, the compression element portion 1 has a motor portion 1A and a compression element portion 1B.
B has a compressor 1 having a capacity control device 20, a condenser 2 and an evaporator 4, and causes the liquid refrigerant on the outlet side of the condenser 2 to be injected into the motor unit 1A to cool the refrigerant after cooling the motor. In the refrigerating apparatus adapted to return to the compression process of the compression element section 1B, the flow rate adjusting valve 6 is provided in the liquid injection passage 5 provided between the outlet side of the condenser 2 and the motor section 1A, and Since the capacity detector 9 for detecting the capacity control value of the capacity control device 20 and the flow rate controller 10 for adjusting the valve opening of the flow rate adjusting valve 6 according to the detected capacity value of the capacity detector 9 are provided, When the capacity control device 20 performs capacity control operation, the capacity control device 2
A capacity control value of 0 is detected by the capacity detector 9, the valve opening of the flow rate adjusting valve 6 is adjusted via the flow rate controller 10 based on the detected capacity value, and the liquid refrigerant corresponding to capacity control is adjusted. Can be injected into the motor section 1A from the refrigerant outlet side of the condenser 2 through the liquid injection passage 5, and therefore, depending on the capacity control state of the capacity control device 20, that is, the operating state of the compressor 1. The required amount of liquid refrigerant can be injected into the motor unit 1A, and the motor unit 1A can be cooled well, while causing liquid compression on the compression element unit 1B side, and discharging. It is also possible to reliably prevent the problem that the gas becomes wet and oil rises.

[Brief description of drawings]

FIG. 1 is a refrigerating piping diagram showing a refrigerating apparatus in a first embodiment of the present invention.

FIG. 2 is a refrigerating piping diagram showing a refrigerating apparatus in a second embodiment of the present invention.

FIG. 3 is a vertical sectional front view of a compression element portion showing a capacity control device, a capacity detector, and a flow rate controller used in a second embodiment.

FIG. 4 is a side view showing a part of a capacity detector and a flow rate controller of a second embodiment.

5 is a sectional view taken along line XX in FIG.

FIG. 6 is a refrigeration piping diagram showing a conventional refrigeration system.

[Explanation of symbols]

 1 Compressor 1A Motor part 1B Compression element part 2 Condenser 4 Evaporator 5 Liquid injection passage 6 Flow control valve 7 Current detector 8 Flow controller 9 Capacity detector 10 Flow controller 20 Capacity controller

Claims (2)

[Claims] 1. A motor unit (1A) and the motor unit (1A)
A compressor (1) provided with a compression element part (1B) driven by, a condenser (2) and an evaporator (4), and the liquid refrigerant at the outlet side of the condenser (2) is Motor part (1A)
In a refrigeration system in which the refrigerant after the motor cooling is returned to the compression process of the compression element part (1B), a liquid provided between the outlet side of the condenser (2) and the motor part (1A). Injection passage (5)
And a current detector (7) for detecting the current value of the motor section (1A), and the flow rate adjustment valve according to the detected current value of the current detector (7). A refrigeration system provided with a flow rate controller (8) for adjusting the valve opening of the valve (6). 2. A motor section (1A) and the motor section (1A)
A compressor (1) having a compression element part (1B) driven by a compressor, and having a capacity control device (20) in the compression element part (1B); a condenser (2) and an evaporator (4); And the liquid refrigerant on the outlet side of the condenser (2) is connected to the motor section (1A).
In a refrigeration system in which the refrigerant after the motor cooling is returned to the compression process of the compression element part (1B), a liquid provided between the outlet side of the condenser (2) and the motor part (1A). Injection passage (5)
A capacity detector (9) for detecting a capacity control value of the capacity control device (20) while interposing a flow control valve (6) on the
And a flow rate controller (10) for adjusting the valve opening of the flow rate adjusting valve (6) according to the detected capacity value of the capacity detector (9).
A refrigerating device, which is provided with.