JP6538493B2 - Cyclone oil separator and refrigeration system - Google Patents

Description

  The present invention relates to a cyclone type oil separator which separates oil contained in refrigerant gas discharged from a compressor, and a refrigeration system using the same.

  Cyclone type oil separators are widely used in various refrigeration systems as oil separators for separating oil contained in refrigerant gas discharged from a compressor. Such a cyclonic oil separator generally comprises a cylindrically-shaped closed vessel, and causes refrigerant gas to flow in tangentially to the inner peripheral surface of the closed vessel via a refrigerant inflow pipe to give a swirling flow to the refrigerant gas. The oil is centrifugally separated, and the separated oil is allowed to flow down to the bottom of the closed container along the inner circumferential surface and returned to the compressor side via the oil return pipe, and the oil from which the separated refrigerant gas is sealed It is made to flow out from the upper central region in a container via a refrigerant outflow pipe, and it circulates to the lower stream side.

  When such a cyclone type oil separator is applied to a refrigeration system provided with a plurality of compression systems, and a cyclone type oil separator is provided for each compression system, it is usually as shown in Patent Document 1 The cyclone type oil separators are connected in communication with each other by means of pressure equalizing pipes and oil equalizing pipes, so that the amount of oil held in each cyclone type oil separator is equalized so that the amount of oil does not occur. To ensure that the oil of

Unexamined-Japanese-Patent No. 10-223056 (patent 3413044) gazette

  However, in the one shown in the patent document 1, the oil equalizing pipe of the cyclone type oil separator is penetrated into the inside from the side of the closed container, and the oil equalizing port is opened at a predetermined height position on the side. In the case of a cyclone type oil separator, in order to impart a swirling flow to the refrigerant in the closed vessel, the oil held on the bottom side in the closed vessel is also swirled along the inner circumferential surface by the swirling flow, and the inner circumferential side The oil level will rise upwards. The rising state of the oil level changes in the vertical direction according to the rotational speed of the compressor, so the oil level becomes unstable at the side position where the oil equalizing port of the oil equalizing pipe is open.

On the other hand, the oil equalizing pipe is penetrated into the inside from the side of the closed container, and the oil equalizing port is opened at a predetermined height position on the side. In this case, the protruding part of the oil equalizing pipe into the container Since the oil level is disturbed, there is a problem that the oil level is further destabilized.
For this reason, it is not possible to stabilize the oil equalizing performance among a plurality of oil separators connected via oil equalizing pipes, and the quality and reliability of the cyclone type oil separator and the refrigeration system using the same are reduced. It was done.

  The present invention has been made in view of such circumstances, and opens the oil equalizing port of the oil equalizing pipe at a position where a stable oil level can be secured, and a plurality of oil separators despite changes in operating conditions It is an object of the present invention to provide a cyclonic oil separator and a refrigeration system capable of stabilizing oil balancing performance among the two.

In order to solve the above-mentioned subject, the cyclone type oil separator and refrigeration system of the present invention adopt the following means.
That is, a cyclone type oil separator according to the present invention is connected to a cylindrical closed vessel, a refrigerant inflow pipe connected to the closed vessel, a refrigerant outflow pipe and an oil return pipe, and the closed vessel, and a plurality of oils. A pressure equalizing pipe and an oil equalizing pipe connecting between the separators, the oil equalizing pipe at the end of the oil equalizing pipe being at a predetermined height position in the closed container, the oil equalizing pipe is opened at a radial central region thereof It is characterized by being.

  According to the present invention, since the oil equalizing port at the end of the oil equalizing pipe is opened at the predetermined height position in the closed container and at the central region in the radial direction, the oil contained in the refrigerant gas In the central area of the closed vessel where the oil level is most stable even if the oil level may be disturbed in some areas by the influence of the swirling flow applied to the refrigerant gas to enhance the separation efficiency of the The oil equalizing function can be performed between the plurality of oil separators via an oil equalizing pipe. Therefore, it is possible to eliminate the influence of the disturbance of the oil level in each oil separator and to stabilize the oil equalizing performance among a plurality of oil separators regardless of the change of the operating condition, and the cyclone type oil separation It is possible to improve the quality and reliability of the container and the refrigeration system using it. In addition, it is only necessary to devise the opening position of the oil equalizing port in the closed container, and the destabilization of the oil equalizing performance can be solved easily.

  Furthermore, in the cyclone type oil separator of the present invention, in the above-mentioned cyclone type oil separator, the oil equalizing pipe is penetrated from the bottom surface of the closed container to the inside, and the oil equalizing port is opened at the position. It is characterized by

  According to the present invention, the oil equalizing pipe is penetrated from the bottom surface of the closed container to the inside, and the oil equalizing port at the end thereof is opened at a predetermined height position in the closed container at the central region in the radial direction Therefore, the oil equalizing performance can be stabilized only by changing the opening position of the oil equalizing port without particularly changing the structure as the oil separator. Therefore, it is possible to easily solve the oil equalizing performance instability without complication of the configuration and cost increase.

  Furthermore, in the cyclone-type oil separator of the present invention, in the above-mentioned cyclone-type oil separator, the oil equalizing pipe is penetrated from the side surface of the closed container to the inside, and the end is bent upward. It is characterized in that the oil port is opened at the above position.

  According to the present invention, the oil equalizing pipe is penetrated from the side surface of the closed container into the inside, and the end thereof is bent upward so that the oil equalizing port is at a predetermined height position in the closed container, and its radial direction The oil equalizing performance can be stabilized only by changing the opening position of the oil outlet without particularly changing the structure as the oil separator. Therefore, it is possible to easily solve the oil equalizing performance instability without complication of the configuration and cost increase.

  Furthermore, the refrigeration system according to the present invention is provided with a plurality of compression systems connected in parallel with each other with respect to the refrigeration cycle and discharge piping systems of the plurality of compression systems, and the separated oil is compressed into a compressor or A plurality of cyclone type oil separators returned to the suction piping system, and a pressure equalizing pipe and an oil equalizing pipe connecting the plurality of cyclone type oil separators, wherein the cyclone type oil separator is any of the cyclones described above It is characterized by being an oil separator.

  According to the present invention, a plurality of compression systems connected in parallel with each other with respect to the refrigeration cycle are provided, and a plurality of discharge piping systems of the plurality of compression systems are connected with each other via pressure equalizing pipes and oil equalizing pipes. In a refrigeration system provided with a cyclone type oil separator, each cyclone type oil separator is any one of the above-mentioned cyclone type oil separators, so that the oil separator is sealed depending on the operating condition of the compressor Even if the oil level in the container is destabilized in a part of the area, the influence can be eliminated to stabilize the oil equalizing performance between the plurality of oil separators. Therefore, it is possible to ensure the quality and reliability as a refrigeration system by eliminating the bias of the amount of oil held in each oil separator and securing an appropriate amount of oil for each compressor.

  According to the cyclone type oil separator of the present invention, the oil level is disturbed in a part of the area by being influenced by the swirling flow given to the refrigerant gas to enhance the separation efficiency of the oil contained in the refrigerant gas. Even if the oil level is the most stable in the central region of the closed vessel, oil equalization can be performed between the oil separators via oil equalizing pipes, so It is possible to eliminate the influence of oil level disturbance and stabilize oil equalizing performance among multiple oil separators despite changes in operating conditions, and a cyclone type oil separator and a refrigeration system using the same To improve the quality and reliability of the In addition, it is only necessary to devise the opening position of the oil equalizing port in the closed container, and the destabilization of the oil equalizing performance can be solved easily.

  According to the refrigeration system of the present invention, even if the oil level in the closed container of the oil separator is destabilized in a part of the region due to the operating condition of the compressor, the influence is eliminated and a plurality of oil separators are separated. Can stabilize oil leveling performance at the same time, eliminating the bias of the amount of oil held in each oil separator and securing an appropriate amount of oil for each Reliability can be ensured.

It is a block diagram of the refrigeration system concerning a 1st embodiment of the present invention. It is a block diagram of the cyclone type oil separator applied to the said refrigeration system. It is a block diagram of the cyclone type oil separator which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.
First Embodiment
Hereinafter, a first embodiment of the present invention will be described using FIGS. 1 and 2.
FIG. 1 shows a block diagram of a refrigeration system according to a first embodiment of the present invention, and FIG. 2 shows a block diagram of a cyclonic oil separator applied to the system.
In the refrigeration system 1, a plurality of outdoor units 3A and 3B are connected in parallel to the refrigeration cycle 2 and a plurality of cooling units 4A and 4B are connected in parallel.

  A cyclone type in which a plurality of outdoor units 3A, 3B are connected in communication with a plurality of compressors 5 connected in parallel with each other and a refrigerant discharge pipe 10A having a check valve 6 connected to each compressor 5 An outdoor refrigerant circuit 10 having an oil separator 7 and a condenser 8 and a receiver 9 sequentially connected to the downstream side of the cyclone type oil separator 7 is provided, and the outdoor refrigerant circuit 10 is connected to a common liquid pipe 14 . The refrigerant suction pipes 10B constituting the outdoor refrigerant circuit 10 connected to the suction side of each compressor 5 are connected to the common gas pipe 15, respectively.

The oil separated from the refrigerant gas by the cyclone type oil separator 7 is supplied to each compressor 5 or its refrigerant suction pipe 10B through the oil return pipe 13 provided with the solenoid valve 11 and the cupirary tube 12 for adjusting the flow rate. It is supposed to be returned. The solenoid valve 11 provided in the oil return pipe 13 is open during operation of the compressor 5 and closed during stoppage thereof.
On the other hand, the plurality of cooling units 4A and 4B are configured to include an expansion valve (pressure reducing device) 16 and an evaporator 17, respectively, and between the common liquid piping 14 and the common gas piping 15 in parallel with each other. It is connected.

  Thus, by connecting the plurality of outdoor units 3A, 3B and the cooling units 4A, 4B via the common liquid piping 14 and the common gas piping 15, a single refrigeration cycle 2 configured as a closed cycle is configured. doing. And this 1 cycle refrigeration cycle 2 turns into a refrigeration cycle 2 provided with 2 compression systems (compression system of each outdoor unit 3A, 3B) mutually connected in parallel.

  In the case of such a refrigeration cycle 2, as for the cyclone type oil separator 7 provided in each outdoor unit 3A, 3B, an imbalance does not occur in the amount of oil held inside due to the change of the operating condition It is necessary to connect the oil separators 7 with each other by the pressure equalizing pipe 18 and the oil equalizing pipe 19 and equalize the amount of oil to be held, so that an appropriate amount of oil is secured in each compressor 5 and the lubrication is properly performed. It is made to be done.

  The cyclone type oil separator 7 is provided with a vertically long cylindrical closed container 20 as shown in FIG. A refrigerant outflow pipe 21 connected to the condenser 8 is connected to the central portion of the upper surface of the closed container 20 so that the end thereof penetrates and protrudes into the closed container 20 and opens at the central position of the upper portion. Further, a refrigerant inflow pipe 22 communicating with the refrigerant discharge pipe 10A from the compressor 5 is opened on the upper side surface of the closed container 20 so that the end thereof is opened tangentially to the inner peripheral surface of the closed container 20. Through, connected. Further, one end of an oil return rod 13 for returning the oil separated by the oil separator 7 to the compressor 5 or its refrigerant suction pipe 10B is connected in communication with the bottom surface of the closed container 20.

  The configuration of the cyclone type oil separator 7 is general and does not differ from the configuration of the well-known cyclone type oil separator 7, but the cyclone type oil separator 7 of the present embodiment is not limited to the above configuration. Hold in each sealed container 20 by connecting a plurality of cyclone type oil separators 7 provided in each discharge piping system of a plurality of compression systems with each other via a pressure equalizing pipe 18 and an oil equalizing pipe 19. The amount of oil used can be equalized.

The pressure equalizing pipes 18 connect the sealed containers 20 of the plurality of oil separators 7 to each other to equalize the internal pressure, and the end portions are connected to the upper surfaces of the sealed containers 20 in communication. .
On the other hand, the oil equalizing pipe 19 is for equalizing the oil level heights of oil separated and held inside the closed container 20 of the plurality of oil separators 7, and in the present embodiment, the bottom surface of the closed container 20 The oil equalizing port 19A at the end thereof is configured to be opened at a predetermined height position in the sealed container 20 and in a radial central region in the sealed container 20. .
In addition, a center area here does not mean a exact center position, and shall be used in the meaning including the field of the fixed range near the center.

With the configuration described above, according to the present embodiment, the following effects can be obtained.
In the refrigeration system 1, the high temperature, high pressure refrigerant gas discharged from the operating compressor 5 is introduced into the cyclone type oil separator 7 through the discharge pipe 10A and the check valve 6, and is contained in the refrigerant gas there. Oil is cyclone separated. The oil separated by the cyclone type oil separator 7 is returned to the compressor 5 side directly or via the suction pipe 10B by a constant amount via the oil return pipe 13. Further, the refrigerant gas from which the oil is separated is sent to a condenser 8 and is condensed and liquefied by being cooled by exchanging heat with the outside air or the like, and is temporarily stored in the receiver 9.

  The refrigerant stored in the receiver 9 is sent out from the outdoor units 3A, 3B to the common liquid pipe 14 side, and is supplied to a plurality of cooling units 4A, 4B. In each of the cooling units 4A and 4B, the pressure is reduced by the expansion valve (pressure reducing device) 16, and the low temperature, low pressure gas-liquid two-phase refrigerant is introduced into the evaporator 17. The refrigerant is evaporated by heat exchange with air as a medium to be cooled in the evaporator 17 and then sucked into the compressor 5 of each of the outdoor units 3A, 3B through the common gas pipe 15 and the refrigerant suction pipe 10B. And circulate in the refrigeration cycle 2 by being compressed again. The air cooled by heat exchange with the refrigerant by the evaporator 17 is blown out to a space to be cooled and the like, and is used to cool or cool the space.

  On the other hand, in the cyclone type oil separator 7, oil in the refrigerant gas is separated by cyclone, and the separated oil is returned to the compressor 5 side directly by a fixed amount via the oil return pipe 13 or via the suction pipe 10B. However, by simultaneously connecting the cyclone type oil separators 7 provided in the outdoor units 3A and 3B with each other via the pressure equalizing pipe 18 and the oil equalizing pipe 19, the amount of oil stored in the respective sealed containers 20 Oil equalization of

  The oil separation function of the cyclone type oil separator 7 makes the refrigerant gas flow tangentially into the cylindrical closed vessel 20 by means of the refrigerant inflow pipe 22 and causes the refrigerant gas flow to swirl along the inner circumferential surface of the vessel. And the separated oil is made to flow down along the inner peripheral surface of the closed vessel 20 and stored in the lower part, and from the central area where the oil content is small via the refrigerant outflow pipe 21. By discharging the refrigerant, it is sent to the condenser 8 on the downstream side.

  The oil separated in the closed container 20 and stored in the lower part thereof is returned to the side of each compressor 5 via the oil return pipe 13 by a constant amount, but the oil is discharged to the oil equalizing port 19A position of the oil equalizing pipe 19 When the surface is reached, oil equalization is achieved via the oil equalizing pipe 19 so that the amount of oil held between the plurality of cyclone type oil separators 7 does not become unbalanced. At this time, the oil surface in the closed container 20 is affected by the swirling flow of the refrigerant gas and ascends along the inner peripheral wall of the closed container 20 as shown by a two-dot chain line in FIG. However, due to the change in the number of revolutions of the compressor 5, it is disordered up and down.

  Therefore, if the oil equalizing pipe 19 is penetrated from the side surface of the closed container 20 and the oil equalizing port 19A is opened at a predetermined height position on the side surface of the container, the oil surface will be adversely affected. , It becomes difficult to secure oil equalization performance. However, in the present embodiment, the oil equalizing pipe 19 is penetrated from the bottom of the closed container 20 to the inside, and the oil equalizing opening 19A is opened at a predetermined height position in the closed container 20 and in the central region in the radial direction. Since the oil level is the most stable in the central area position, oil equalization can be performed between the plurality of oil separators 7 via the oil equalizing pipe 19.

Thereby, according to the present embodiment, the influence of the destabilization of the oil surface in each oil separator 7 is reliably eliminated, and a plurality of oil separations connected by the oil equalizing pipe 19 regardless of the change of the operating condition The oil equalization performance between the vessels 7 can be stabilized, and the quality and reliability of the cyclonic oil separator and the refrigeration system using it can be ensured.
In addition, it is only necessary to devise the opening position of the oil equalizing port 19A in the closed container 20, and it is possible to easily solve the instability of the oil equalizing performance.

Second Embodiment
Next, a second embodiment of the present invention will be described using FIG.
The present embodiment differs from the above-described first embodiment in the connection configuration of the oil equalizing pipe 29 to the closed container 20. The other points are the same as in the first embodiment, and thus the description thereof is omitted.
In this embodiment, the oil equalizing pipe 29 is internally penetrated horizontally from the side surface of the lower portion of the closed container 20, and the end is bent upward, and the oil equalizing port 29A at the tip is inside the closed container 20. It is configured to be opened at a predetermined height position and in the central region in the radial direction in the sealed container 20.

  Even with the above-described configuration, the oil equalizing port 29A of the oil equalizing pipe 29 is opened at a predetermined height position in the sealed container 20 and in the central region in the radial direction in the sealed container 20. The same effect as that of the first embodiment can be obtained.

  The present invention is not limited to the invention according to the above-described embodiment, and appropriate modifications can be made without departing from the scope of the invention. For example, in the above embodiment, an example of the refrigeration system 1 in which the outdoor units 3A and 3B including the plurality of compressors 5 connected in parallel are connected in parallel to the refrigeration cycle 2 has been described. It is not necessary that two or more units are arranged in parallel, and it may be a refrigeration system in which a single compressor 5 is provided for each of the outdoor units 3A and 3B.

  Further, in the above embodiment, although the refrigeration system 1 has a plurality of outdoor units 3A and 3B connected in parallel to the refrigeration cycle 2, a refrigeration cycle 2 in which a plurality of compressors 5 are connected in parallel in a single outdoor unit. Needless to say, the present invention can be similarly applied to the refrigeration system 1 in which the cyclone type oil separator 7 is provided in the discharge piping system of each compression system.

DESCRIPTION OF SYMBOLS 1 Refrigeration system 2 Refrigeration system 3A, 3B Outdoor unit 4A, 4B Cooling unit 5 Compressor 7 Cyclone type oil separator 10A Discharge piping 10B Suction piping 13 Oil return pipe 18 Pressure equalization pipe 19, 29 Oil equalization pipe 19A, 29A Oil outlet 20 Sealed container 21 refrigerant outflow pipe 22 refrigerant inflow pipe

Claims (4)

Cylindrical closed container,
A refrigerant inflow pipe, a refrigerant outflow pipe, and an oil return pipe connected to the sealed container;
A pressure equalizing pipe and an oil equalizing pipe connected to the sealed container and connecting a plurality of oil separators;
A cyclone type oil separator characterized in that the oil equalizing port at the end of the oil equalizing pipe is opened at a predetermined height position in the closed container at a central region in the radial direction.   The cyclone type oil separator according to claim 1, wherein the oil equalizing pipe is penetrated from the bottom surface of the closed container to the inside, and the oil equalizing port is opened at the position.   The oil equalizing pipe according to claim 1, wherein the oil equalizing pipe is penetrated from the side surface of the closed container to the inside, and the oil equalizing port is opened at the position by bending an end thereof upward. Cyclone-type oil separator. A plurality of compression systems connected in parallel with each other with respect to the refrigeration cycle;
A plurality of cyclone type oil separators provided in each discharge piping system of the plurality of compression systems and returning separated oil to the compressor or its suction piping system;
A pressure equalizing pipe and a oil equalizing pipe connecting the plurality of cyclone type oil separators,
A refrigeration system characterized in that the cyclone type oil separator is the cyclone type oil separator according to any one of claims 1 to 3.

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