KR20200031812A - Compressor and Chiller system including the same - Google Patents

Abstract

The present invention relates to a compressor having a flow path to effectively cool a rotary shaft and a motor for driving the rotary shaft, and a chiller system including the compressor. According to an embodiment of the present invention, the compressor comprises: a body space; a first compression space; a second compression space; a refrigerant inlet port formed on one side of the first compression space so that a refrigerant can be introduced into the first compression space; a refrigerant outlet port formed on one side of the second compression space so that the refrigerant compressed in the second space can be discharged; an injection refrigerant port formed on one side of the body space so that the refrigerant can be introduced into the body space; and a compression pipe configured to connect one of the first compression space and the second compression space to the body space.

Description

Compressor and Chiller system including the same

The present invention relates to a compressor and a chiller system comprising the same.

Generally, a chiller system means a system that supplies cold water to a consumer. In detail, the chiller system is characterized in that the cooling water is cooled by heat exchange between the refrigerant circulating the refrigerant cycle and the cold water circulating the customer. In addition, the chiller system is a relatively large-capacity facility and can be installed in a large building.

The chiller system includes a chiller unit forming a refrigeration cycle and a customer. The demand destination may correspond to an air conditioner using cold water. That is, the chiller system may be understood as a type of air conditioning system. In addition, only the chiller unit may be referred to as a chiller system.

The chiller unit includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant compressed in the compressor, an expansion device for depressurizing the refrigerant condensed in the condenser, and an evaporator for evaporating the reduced pressure in the expansion device. In the condenser, refrigerant and external air or cooling water are exchanged, and refrigerant and cold water may be exchanged in the evaporator.

In general, the compressor used in the chiller system corresponds to a turbo compressor. The turbo compressor is a kind of a centrifugal compressor, and may be understood as a device for compressing refrigerant flowing into the inside using a centrifugal force of an impeller rotating at high speed.

Therefore, the turbo compressor includes an impeller for rotating the fluid. In particular, the turbo compressor is provided with a pair of impellers to compress the fluid in two stages.

The applicant has filed prior document 1 with regard to a turbo compressor performing two-stage compression.

<Prior Art 1>

1.Public number: 10-2018-0093692 (Public date: August 22, 2018)

2. Name of invention: Turbo compressor

In the prior document 1, a first impeller and a second impeller connected to both ends of the rotating shaft and the rotating shaft are disclosed. At this time, the refrigerant flowing into the first impeller side may be compressed by one stage and discharged, and again introduced into the second impeller side and compressed by two stages to be discharged.

That is, the refrigerant compressed in one stage in the first impeller flows into the second impeller and is compressed in two stages. At this time, the refrigerant compressed by the first impeller corresponds to a relatively high temperature. When such a high temperature refrigerant flows into the second impeller, there is a problem in that the compression efficiency of the second impeller decreases.

In addition, there is a problem that an effective cooling device is not provided in the rotating shaft and the motor driving the rotating shaft. The temperature of the motor is increased to a very high temperature according to the driving of the turbo compressor. Accordingly, the performance of the motor is lowered, and as a result, the efficiency of the turbo compressor may be lowered.

In addition, there is a problem in that a separate cooling tube must be provided for cooling the motor. For example, in order to cool the motor, a separate flow path of refrigerant may be formed inside the compressor. Further, a cooling water pipe for cooling the motor may be formed. Such a structure complicates the installation structure and can increase the installation cost.

The present invention has been proposed to solve this problem, and an object of the present invention is to provide a compressor having a flow path for effective cooling of a rotating shaft and a motor driving the rotating shaft and a chiller system including the same.

In addition, it is an object of the present invention to provide a compressor and a chiller system including the same, which increases the cooling efficiency of the rotating shaft through injection and increases the compression efficiency by lowering the temperature of the single-stage compressed refrigerant.

In the compressor according to the spirit of the present invention, a main body space in which a motor for driving a rotation shaft is installed, a first compression space in which a first impeller rotated by the rotation shaft to compress refrigerant is installed, and rotated by the rotation shaft, A second compression space is provided in which a second impeller for compressing the refrigerant compressed in the first impeller is installed.

In addition, the refrigerant is formed in one side of the second compression space so that the refrigerant is introduced into the first compression space, and the refrigerant inlet port formed in one side of the first compression space and the refrigerant compressed in the second space are discharged. Discharge port is provided.

In particular, the compressor is provided with an injection refrigerant port formed on one side of the body space so as to introduce refrigerant into the body space.

In addition, a compression pipe connecting any one of the first compression space and the second compression space and the main body space is included.

On the other hand, in the chiller system according to the spirit of the present invention, so that the refrigerant discharged from the evaporator flows into the first compression space, the compressor inlet pipe connecting the first compression space and the evaporator, compressed in the second compression space A compressor discharge pipe connecting the second compression space and the condenser and a connection pipe connecting the evaporator and the condenser are included so that the refrigerant flows to the condenser.

In particular, an injection pipe connecting one side of the connection pipe and the body space is provided so that a part of the refrigerant flowing from the condenser to the evaporator flows into the body space.

According to the present invention, the one-stage compressed refrigerant and the injected refrigerant flow through a rotating shaft and a motor driving the rotating shaft, so that the rotating shaft and the like can be effectively cooled.

Accordingly, the performance of the motor is maximized, and the performance and efficiency of the compressor are maximized.

In addition, as the refrigerant compressed in the first stage in the first impeller is mixed with the injected refrigerant at a lower temperature and provided as the second impeller, there is an advantage that the compression efficiency of the second impeller can be improved.

In addition, by cooling the rotating shaft and the like through an internal flow path without the need for a separate cooling device, there is an advantage of minimizing the volume of the compressor and chiller system.

Accordingly, there is an advantage that the installation freedom of the compressor and the chiller system is relatively large.

1 is a view showing a chiller system according to an embodiment of the present invention.
2 is a view schematically showing the configuration of a chiller system according to an embodiment of the present invention.
3 is a view schematically showing a fluid flowing through a chiller system according to an embodiment of the present invention.
4 is a view showing the flow of the refrigerant passing through the compressor and it according to an embodiment of the present invention.
5 is a view showing the flow of a compressor and a refrigerant passing through the compressor according to another embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that, when adding reference numerals to the components of the drawings, the same components have the same reference numerals as possible, even if they are displayed on different drawings. In addition, in describing embodiments of the present invention, when it is determined that detailed descriptions of related well-known configurations or functions interfere with understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.

In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, the component may be directly connected to or connected to the other component, but another component between each component It should be understood that may be "connected", "coupled" or "connected".

1 is a view showing a chiller system according to an embodiment of the present invention.

As shown in FIG. 1, the chiller system 10 according to the spirit of the present invention includes a chiller unit 100, a cooling tower 20, and a customer 30.

The chiller unit 100 may be understood as a configuration in which a refrigeration cycle is formed. The chiller system 10 may be used in the same manner as the chiller unit 100. That is, the chiller unit 100 may be referred to as the chiller system 10.

The cooling tower 20 is configured to supply cooling water to the chiller unit 100. In addition, the chiller system 10 may be provided with a fan or the like instead of the cooling tower 20 to exchange heat with air. For example, the cooling tower 20 may be installed in a relatively large scale chiller system, and the blower fan may be installed in a relatively small chiller system.

The demand destination 20 corresponds to a configuration in which cold water exchanged with the chiller unit 100 circulates. At this time, the demand destination 30 may be understood as an apparatus or body space for performing air conditioning using cold water.

Between the chiller unit 100 and the cooling tower 20, a cooling water circulation channel 40 is provided. The cooling water circulation channel 40 is a pipe that guides cooling water to circulate through the cooling tower 20 and the chiller unit 100.

The cooling water circulation channel 40 may include a cooling water acquisition channel 42 and a cooling water extraction channel 44. The cooling water acquisition passage 42 corresponds to a pipe that guides cooling water to flow into the chiller unit 100. In addition, the cooling water outlet passage 44 corresponds to a pipe that guides cooling water heated in the chiller unit 100 to flow to the cooling tower 20.

At least one of the coolant inflow passage 42 and the coolant outflow passage 44 may be provided with a coolant pump 46 driven for the flow of coolant. For example, FIG. 1 shows that the cooling water pump 46 is provided in the cooling water inflow passage 42.

In the cooling water outlet channel 44, an outlet temperature sensor 47 for sensing the temperature of the cooling water flowing into the cooling tower 20 may be provided. In addition, an inlet temperature sensor 48 for sensing the temperature of the cooling water discharged from the cooling tower 20 may be provided in the cooling water inlet passage 42.

Between the chiller unit 100 and the cold water demand destination 30, a cold water circulation flow path 50 is provided. The cold water circulation passage 50 is a pipe that guides cold water to circulate the cold water demand destination 30 and the chiller unit 100.

The cold water circulation flow path 50 may include a cold water acquisition flow path 52 and a cold water extraction flow path 54. The cold water inflow passage 52 corresponds to a pipe that guides cold water to flow into the chiller unit 100. The cold water outlet passage 54 corresponds to a pipe that guides the cold water cooled in the chiller unit 100 to flow to the cold water demand destination 30.

At least one of the cold water inflow passage 52 and the cold water outflow passage 54 may be provided with a cold water pump 56 driven for the flow of cold water. For example, FIG. 1 shows that the cold water pump 56 is provided in the cold water inflow passage 52.

At this time, the cold water demand destination 30 may be a water-cooled air conditioner that exchanges air with cold water.

For example, the cold water demand destination 30 is installed in the air handling unit (AHU) that mixes indoor air and outdoor air and heat-exchanges the mixed air with cold water to be discharged into the room. It may include at least one unit of a fan coil unit (FCU) discharging to the room after heat exchange with cold water and a floor piping unit buried in the floor of the room.

In FIG. 1, the cold water demand destination 30 is shown to be configured as an air handling unit.

The cold water demand destination 30 composed of the air handling unit may include a casing 61, a cold water coil 62, and blowers 63 and 64. The cold water coil 62 is installed inside the casing 61 and corresponds to a configuration in which cold water passes.

The blowers 63 and 64 are provided on both sides of the cold water coil 62 and can suck indoor air and outdoor air to blow them indoors. The blowers 63 and 64 may include a first blower 63 and a second blower 64. The first blower 63 is installed such that indoor air and outdoor air are sucked into the casing 61. In addition, the second blower 64 is installed so that the air-conditioned air is discharged to the outside of the casing 61.

Also, in the casing 61, an indoor air intake 65, an indoor air discharge 66, an external air intake 67, and an air conditioning exhaust 68 may be formed.

When the blowers 63 and 64 are driven, some of the air sucked into the indoor air intake 65 from the room is discharged to the indoor air discharge 66. In addition, the remaining air that is not discharged to the indoor air discharge unit 66 may be mixed with outdoor air sucked into the outdoor air suction unit 67.

Then, the mixed air is heat-exchanged with the cold water coil 62. In addition, the mixed air heat-exchanged or cooled with the cold water coil 62 may be discharged into the room through the air conditioning air discharge unit 68. Through this process, it is possible to cool the indoor body space by supplying the harmonized air to the room.

Further, the cold water demand destination 30 may correspond to a facility that directly uses cold water. For example, the cold water demand destination 30 may provide cold water to lower the temperature of the semiconductor component. In addition, the chiller system 10 according to the spirit of the present invention can supply cooling water to the hot water customer rather than the cooling tower 20.

The chiller system 10 according to the spirit of the present invention is not limited to the configuration shown in FIG. 1 and may be provided in various configurations. That is, the configuration of the chiller system 10 is exemplary and may be added, omitted, or modified.

Hereinafter, the chiller unit 100 will be described in detail.

2 is a view schematically showing the configuration of a chiller system according to an embodiment of the present invention. The chiller unit 100 corresponds to a portion in which the refrigeration cycle is formed in the chiller system 10.

As shown in FIG. 2, the chiller unit 100 according to the spirit of the present invention includes a compressor 200, the evaporator 150, and the condenser 140.

The compressor 200 is a component for compressing the refrigerant. The compressor 200 according to the spirit of the present invention may be provided as a turbo compressor, which is a kind of a centrifugal compressor. The centrifugal compressor is understood as a compressor in which a refrigerant is compressed and discharged by converting kinetic energy of the refrigerant into a static pressure energy through a rotating body such as an impeller or a blade.

The condenser 140 is configured such that the refrigerant discharged from the compressor 200 and the cooling water flowing through the cooling water circulation channel 40 are exchanged. That is, a refrigerant compressed from the compressor 200 may be introduced into the condenser 140. The evaporator 150 is configured such that the refrigerant discharged from the condenser 140 and the cold water flowing through the cold water circulation channel 50 are exchanged.

At this time, the condenser 140 is installed on the bottom surface, the evaporator 150 is installed on the top of the condenser 140, the compressor 200 is installed on the top of the evaporator 150. This arrangement is exemplary, and the compressor 200, the evaporator 150, and the condenser 140 may be variously arranged.

The condenser 140 and the evaporator 150 are provided with a condenser body 170 and an evaporator body 180 provided in a cylindrical shape extending in an axial direction. The condenser main body 170 and the evaporator main body 180 are provided to have the same axial length, and may be installed spaced apart at predetermined intervals in the vertical direction in parallel with each other. In particular, the condenser body 170 and the evaporator body 180 may be installed such that the bottom surface and the axial direction are parallel.

Plates 172 and 182 for installation are respectively coupled to both ends of the condenser body 170 and the evaporator body 180. The plates 172 and 182 may be provided in a rectangular shape, and may be installed perpendicular to the bottom surface. In addition, the plates 172 and 182 include a condensation plate 172 installed on the condenser body 170 and an evaporation plate 182 installed on the evaporator body 180.

The condensation plate 172 may be combined with the leg 171 provided flat on the bottom surface so that it can be stably installed on the bottom surface. The evaporation plate 182 may have a lower end coupled with the upper end of the condensation plate 172. At this time, each coupling may be coupled through a coupling member such as a bolt, or may be coupled by welding or the like.

The condensation plate 172 and the evaporation plate 182 are provided with a cooling water receiving portion 174 and a cold water receiving portion 184 in which cooling water and cold water are accommodated.

In summary, in the condenser 140, the condensation plate 172 is coupled to both ends of the condenser body 170, and the cooling water receiving portion 174 is coupled to the outside of the condensation plate 172, respectively. It is prepared in the form. In addition, in the evaporator 150, the evaporator plates 182 are coupled to both ends of the evaporator body 180, and the cold water receiving portion 184 is coupled to the outside of the evaporator plate 182, respectively. It is prepared in the form.

The cooling water receiving part 174 and the cold water receiving part 184 include cooling water coupling parts 176 and 177 and cold water coupling parts 186 and 187 coupled to the cooling water circulation passage 40 and the cold water circulation passage 50. ) Is prepared.

In detail, the cooling water receiving portion 174 includes a first cooling water coupling portion 176 coupled with the cooling water inflow passage 42 and a second cooling water coupling portion 177 coupled with the cooling water outlet flow passage 44. It may be provided. In addition, the cold water receiving portion 184 is provided with a first cold water coupling portion 186 coupled with the cold water inflow passage 52 and a second cold water coupling portion 187 coupled with the cold water outlet passage 54. Can be

Referring to FIG. 2, the first cold water coupling part 186, the second cold water coupling part 187, the first cooling water coupling part 176, and the second cooling water coupling part 187 are sequentially in the vertical direction. Can be deployed. However, this arrangement is understood to be exemplary.

In addition, the chiller unit 100 according to the spirit of the present invention may include a control box 160 equipped with a device capable of controlling each configuration. The control box may be attached in a box shape to one side of the condenser 140 and the evaporator 150.

The configuration of the chiller unit described above is exemplary and may be added, omitted, or modified. For example, the chiller unit 100 may further include an economizer.

Hereinafter, the flow of the refrigerant will be described in detail based on such a configuration.

3 is a view schematically showing a fluid flowing through a chiller system according to an embodiment of the present invention. In FIG. 3, the flow of the refrigerant is briefly illustrated through a refrigerant pipe, and the flow of cold water and cooling water in the evaporator 150 and the condenser 140 is schematically illustrated.

3, the compressor 200, the condenser 140 and the evaporator 150 are connected to each other through a pipe.

Hereinafter, a pipe connecting the condenser 140 and the evaporator 150 is referred to as a connecting pipe 102. The connection pipe 102 may be understood as a pipe through which the liquid refrigerant condensed in the condenser 140 flows. In addition, the connection pipe 102 may be provided with an expansion device 103 for expanding the refrigerant.

In this case, the chiller unit 100 further includes an injection pipe 104 connecting the connection pipe 102 and the compressor 200. The injection pipe 104 may be understood as a pipe through which at least a portion of the refrigerant flowing into the liquid pipe 102 flows.

That is, the injection pipe 104 may be understood as a pipe branched from the connection pipe 102. In particular, the injection pipe 104 may be branched from the rear in the flow direction than the expansion device 103. In addition, an injection expansion device 105 for expanding the refrigerant may be provided in the injection pipe 104.

The arrangement of the connection pipe 102 and the injection pipe 104 may be provided differently according to the design. In addition, the expansion device 103 and the injection expansion device 105 may be arranged in various shapes, numbers and positions.

For example, the injection expansion device 105 may be omitted, and the injection pipe 104 may be branched in the flow direction in front of the expansion device 103. That is, the refrigerant expanded in the expansion device 103 may flow to the injection pipe 104.

In addition, a pipe connecting the evaporator 150 and the compressor 200 is referred to as a compressor inlet pipe 106. The compressor inlet pipe 106 may be understood as a pipe through which the refrigerant evaporated from the evaporator 150 flows.

In addition, a pipe connecting the condenser 140 and the compressor 200 is referred to as a compressor discharge pipe 108. The compressor discharge pipe 108 may be understood as a pipe through which the refrigerant compressed in the compressor 200 flows.

In addition, the compressor 200 according to the spirit of the present invention further includes a compression pipe 280 connected from one side of the compressor 200 to the other side. The compression pipe 280 will be described later in detail together with the internal configuration of the compressor 200.

Hereinafter, the flow of the fluid in the chiller system 10 will be described.

The refrigerant compressed in the compressor 200 flows to the condenser 140 along the compressor discharge pipe 108. Then, the refrigerant is heat exchanged with the cooling water in the condenser 140. In detail, the refrigerant flowing in the compressor 200 is introduced into the condenser main body 170 and exchanges heat with each other while contacting the cooling water flowing through the plurality of coolant pipes 175 provided inside the condenser main body 170. .

At this time, the refrigerant is condensed by releasing heat to the cooling water, and the cooling water receives heat from the refrigerant to increase the temperature. On the other hand, when the cooling tower 20 is omitted in the chiller system 10, the refrigerant may be exchanged with external air.

The refrigerant condensed in the condenser 140 flows to the evaporator 150 along the connection pipe 103. At this time, some of the refrigerant flowing into the connection pipe 103 may flow to the compressor 200 along the injection pipe 104.

In addition, the refrigerant flowing into the connection pipe 103 may expand in the expansion device 103 and flow into the evaporator 150. Then, the evaporator 150 is heat-exchanged with cold water.

In detail, the refrigerant is introduced into the evaporator body 180 and exchanges heat with each other while contacting the cold water flowing through the plurality of cold water pipes 185 provided inside the evaporator body 180. At this time, the refrigerant absorbs the heat of the cold water and evaporates, and the cold water is deprived of heat by the refrigerant and the temperature decreases.

Then, the refrigerant evaporated by the heat exchange of the cold water flows to the compressor 200 along the compressor inlet pipe 106. In addition, the refrigerant may circulate the above process.

Hereinafter, the internal configuration of the compressor 200 and the flow of refrigerant in the compressor 200 will be described.

4 is a view showing the flow of the refrigerant passing through the compressor and it according to an embodiment of the present invention.

As shown in Figure 4, the compressor 200, the compressor inlet pipe 106, the compressor discharge pipe 108 and one end of the injection pipe 104 is coupled. In addition, it can be understood that the compressor 200 has a connection portion of each pipe.

That is, the compressor 200, the refrigerant inlet port 1060 connected to the compressor inlet pipe 106, the refrigerant outlet port connected to the compressor discharge pipe 108, 1080 and the injection pipe 104 and An injection refrigerant port 1040 to be connected is formed.

The compressor inlet pipe 106, the compressor discharge pipe 108, and the injection pipe 104 extend from the compressor 200 and the other end is combined with other components. In detail, the other end of the compressor inlet pipe 106 is coupled to the evaporator 150, and the other end of the compressor discharge pipe 108 is coupled to the condenser 140. And, the other end of the injection pipe 104 is coupled to one side of the connection pipe (102).

In addition, an internal space provided as a compression space 210 and 220 and a body space 260 is formed in the compressor 200. In this case, the body space 260 may be understood as a space other than the compressed spaces 210 and 220.

The compression spaces 210 and 220 include a first compression space 210 in which the first impeller 212 is installed and a second compression space 220 in which the second impeller 214 is installed. The first compression space 210 and the second compression space 220 may be understood as a space where refrigerant is sucked, compressed, and discharged.

That is, the compressor 200 according to the spirit of the present invention can be understood as a multi-stage compression turbo compressor including a plurality of impellers. For example, the first impeller 212 and the second impeller 214 may be provided to compress the refrigerant four times. Accordingly, the compressor 200 can compress the refrigerant 16 times.

In this case, the first impeller 212 may be understood as a configuration in which the refrigerant is compressed in one stage and the second impeller 214 is compressed in the second stage. Inside the compressor 200, the first impeller 212 and the second impeller 214 may be sequentially arranged in a flow direction of the refrigerant.

In the main body space 260, a rotating shaft 230 and a motor 240 providing driving force to the rotating shaft 230 are installed. The rotating shaft 230 may extend to the first compression space 210 and the second compression space 220 to be combined with the first impeller 212 and the second impeller 214.

The motor 240 may be disposed outside the rotational axis 230 in the radial direction. In detail, the motor 240 may be provided in a ring shape surrounding the outer circumferential surface of the rotating shaft 230.

In addition, a magnet 232 to which rotational force is applied according to driving of the motor 240 may be installed on the rotating shaft 230. At this time, the magnet 232 may be referred to as a configuration of the motor 240.

That is, according to the driving of the motor 240, the rotating shaft 230 is rotated together with the magnet 232. Accordingly, the first impeller 212 and the second impeller 214 are rotated to compress the refrigerant.

In addition, various bearings 270 for supporting each component and a balance weight 250 for a center of gravity may be installed in the body space 260. A plurality of bearings 270 may be installed to function to attenuate repulsive force or the like generated when the rotating shaft 230 is rotated.

Referring to Fig. 4, the arrangement between each configuration will be described in detail.

The rotating shaft 230 is installed in the axial direction through the body space 260 and the compression space (210, 220). At this time, the first compression space 210 and the second compression space 220 are disposed on one side of the body space 260. In detail, the first compression space 210, the second compression space 220 and the body space 260 are sequentially arranged in the axial direction.

That is, the first impeller 212 and the second impeller 214 are installed together on one side of the rotating shaft 230. In particular, the first impeller 212 is installed on the outside, and the second impeller 214 is installed on the inside.

In addition, the motor 240 is installed outside the center of the rotating shaft 230. And, for the center of gravity, a balance weight 250 corresponding thereto may be installed on the other side of the rotating shaft 230.

At this time, the compressor inlet pipe 106 is coupled to one side of the first compression space 210. That is, the refrigerant inlet port 1060 is provided at one side of the first compression space 210. Accordingly, the refrigerant evaporated in the evaporator 150 may be introduced into the first compression space 210 and compressed by the first impeller 212.

In addition, the compressor discharge pipe 108 is coupled to one side of the second compression space 220. That is, the refrigerant discharge port 1080 is provided at one side of the second compression space 220. Accordingly, the refrigerant compressed by the second impeller 214 may be discharged from the second compression space 220 and flow to the condenser 140.

In addition, the injection pipe 104 is coupled to one side of the body space 260. That is, the injection refrigerant port 1040 is provided on one side of the body space 260. Accordingly, the refrigerant flowing into the injection pipe 104 may flow into the body space 260 in which the motor 240 is installed.

In addition, the compression pipe 280 is coupled to the compressor 200. As described above, the compression pipe 280 is connected from one side of the compressor 200 to the other side. That is, it can be understood that the compressor 200 is provided with a connection portion of the compression pipe 280, respectively.

Hereinafter, a portion connected to both ends of the compression pipe 280 is referred to as a first connection port 2800 and a second connection port 2802. At this time, the compression pipe 280 is provided to connect the compression space (210, 220) and the main body space (260). That is, one of the first connection port 2800 and the second connection port 2802 is provided in the compression spaces 210 and 220, and the other is provided in the body space 260.

Referring to FIG. 4, the compression pipe 280 connects the first compression space 210 and the body space 260. In detail, the compression pipe 280 flows the refrigerant discharged from the first compression space 210 into the body space 260. Accordingly, the first connection port 2800 is provided on one side of the first compression space 210, and the second connection port 2802 is provided on one side of the body space 260.

In summary, the refrigerant flowing in the evaporator 150 flows into the first compression space 210 through the compressor inlet pipe 106. Then, the refrigerant compressed by the first stage by the first impeller 212 (hereinafter referred to as the first stage compressed refrigerant) flows into the body space 260 along the compressed pipe 280.

At this time, the refrigerant inflow port 1060 is formed on one side in the axial direction of the first compression space 210, and the first connection port 2800 is on one side in the radial direction of the first compression space 210. Is formed. Accordingly, refrigerant is introduced into the first compression space 210 in the axial direction through the compressor inlet pipe 106. Then, the refrigerant is discharged from the first compression space 210 in the radial direction through the compression pipe 280.

In addition, the second connection port 2802 is formed on one side in the axial direction of the body space 260. Accordingly, at both ends of the compressor 200 in the axial direction, the refrigerant inflow port 1060 and the second connection port 2802 are respectively provided. In particular, the refrigerant inlet port 1060 and the second connection port 2802 may be positioned corresponding to both ends of the rotating shaft 230.

Accordingly, the first stage compressed refrigerant flows in the axial direction of the body space 260 through the compressed pipe 280. In addition, refrigerant (hereinafter, injection refrigerant) flowing through the injection pipe 104 flows into the main body space 260. At this time, the injection refrigerant port 1040 is formed on one side in the radial direction of the body space 260, and the injection refrigerant flows in the radial direction of the body space 260.

The first stage compressed refrigerant and the injection refrigerant may be mixed in the main body space 260. Hereinafter, it is referred to as a mixed refrigerant. The mixed refrigerant flows through the main body space 260 and cools the internal structure of the main body space 260. In particular, the mixed refrigerant may cool the motor 240.

When the motor 240 is driven with the compressor 200, the temperature is increased relatively quickly. If the temperature of the motor 240 is too high, a problem that the motor 240 cannot function properly may occur. In addition, various problems may occur in which heat of the motor 240 is transferred to other components to cause malfunctions such as electronic devices.

Therefore, the compressor 200 according to the spirit of the present invention may lower the temperature of the motor 240 by flowing the mixed refrigerant to the motor 240. At this time, the mixed refrigerant is configured to a temperature lower than the temperature of the motor 240.

In particular, the injection refrigerant corresponds to the refrigerant flowing in the low temperature portion of the entire system. In addition, all or at least part of the injection refrigerant is composed of liquid refrigerant. Therefore, as the injection refrigerant is supplied to the main body space 260, the liquid refrigerant is evaporated and the temperature of the motor 240 can be lowered more effectively.

In addition, the mixed refrigerant may cool all other configurations accommodated in the main body space 260 as well as the motor 240. In detail, the mixed refrigerant flows along the rotating shaft 230 and may cool the rotating shaft 230.

In addition, the mixed refrigerant flows into the second compression space 220 and is compressed by the second impeller 222. At this time, the refrigerant (mixed refrigerant) flowing into the second compression space 220 may have a lower temperature than the refrigerant discharged from the first compression space 210 (one-stage compressed refrigerant).

In addition, all of the liquid refrigerant of the injection refrigerant is evaporated, and there is no liquid refrigerant in the refrigerant provided to the second compression space 220. Accordingly, a liquid refrigerant is provided to the second compression space 220 to prevent the second impeller 222 from being damaged.

At this time, the second compression space 220 and the body space 260 are provided in an open state. For example, a configuration that prevents leakage of refrigerant may not be installed between the second compression space 220 and the body space 260.

Then, the refrigerant compressed by the second stage by the second impeller 222 (hereinafter, the two-stage compressed refrigerant) flows to the condenser 150 along the compressor discharge pipe 108. At this time, the refrigerant discharge port 1080 is formed on one side in the radial direction of the second compression space 220.

5 is a view showing the flow of a compressor and a refrigerant passing through the compressor according to another embodiment of the present invention. The compressor 200a illustrated in FIG. 5 includes the same configuration as the compressor 200 illustrated in FIG. 4. Therefore, detailed description of each component is omitted, and the above description is cited.

As shown in FIG. 5, the compressor 200a includes a refrigerant inlet port 1060a connected to the compressor inlet pipe 106, a refrigerant discharge port 1080a connected to the compressor discharge pipe 108, and the An injection refrigerant port 1040a connected to the injection pipe 104 is included.

In addition, the compressor 200a is formed with an internal space provided with compression spaces 210a and 220a and a body space 260a.

The compression spaces 210a and 220a include a first compression space 210a in which the first impeller 212a is installed and a second compression space 220a in which the second impeller 214a is installed.

In the main body space 260a, a rotating shaft 230a and a motor 240a providing a driving force to the rotating shaft 230a are installed. The rotating shaft 230a may extend to the first compression space 210a and the second compression space 220a, and may be combined with the first impeller 212a and the second impeller 214a.

In addition, various bearings 270a for supporting each component and a balance weight 250a for a center of gravity may be installed in the body space 260a.

Referring to Fig. 5, the arrangement between each configuration will be described in detail.

The rotating shaft 230a penetrates the main body space 260a and the compression spaces 210a and 220a and is installed in the axial direction. At this time, the first compression space 210a is disposed on one side of the body space 260a, and the second compression space 220a is disposed on the other side of the body space 260a.

That is, the first impeller 212a and the second impeller 214a are respectively installed on both sides of the rotating shaft 230a. And, for the center of gravity, the balance weight 250a may be installed on one side of the rotating shaft 230a. In FIG. 5, the balance weight 250a is illustrated as being disposed adjacent to the second compression space 220a, but is not limited thereto.

At this time, the compressor inlet pipe 106 is coupled to one side of the first compression space (210a). That is, the refrigerant inlet port 1060a is provided at one side of the first compression space 210a. Accordingly, the refrigerant evaporated in the evaporator 150 may be introduced into the first compression space 210a and compressed by the first impeller 212a.

In addition, the compressor discharge pipe 108 is coupled to one side of the second compression space (220a). That is, the refrigerant discharge port 1080a is provided at one side of the second compression space 220a. Accordingly, the refrigerant compressed by the second impeller 214a is discharged from the second compression space 220a and flows to the condenser 140.

In addition, the injection pipe 104a is coupled to one side of the body space 260a. That is, the injection refrigerant port 1040a is provided at one side of the body space 260a. Accordingly, the refrigerant flowing into the injection pipe 104 may flow into the body space 260a in which the motor 240a is installed.

In addition, a compression pipe 290 is coupled to the compressor 200a. The compression pipe 290 is connected from one side of the compressor 200a to the other side. That is, it can be understood that the compressor 200a is provided with a connection portion of the compression pipe 290, respectively.

Hereinafter, a portion connected to both ends of the compression pipe 290 is referred to as a first connection port 2900 and a second connection port 2902. At this time, the compression pipe 290 is provided to connect the compression space (210a, 220a) and the main body space (260a). That is, one of the first connection port 2900 and the second connection port 2902 is provided in the compression spaces 210a and 220a, and the other is provided in the body space 260a.

Referring to FIG. 5, the compression pipe 290 connects the second compression space 220a and the body space 260a. In detail, the compression pipe 290 flows the refrigerant discharged from the body space 260a into the second compression space 220a. Accordingly, the first connection port 2900 is provided at one side of the body space 260a, and the second connection port 2902 is provided at one side of the second compression space 220a.

In summary, the refrigerant flowing in the evaporator 150 flows into the first compression space 210a through the compressor inlet pipe 106. Then, the refrigerant compressed by the first stage by the first impeller 212a (hereinafter, the compressed refrigerant by one stage) flows into the body space 260a.

At this time, the refrigerant inlet port (1060a) is formed on one side in the axial direction of the first compression space (210a). Accordingly, refrigerant is introduced into the first compression space 210a in the axial direction through the compressor inlet pipe 106. In particular, the refrigerant inlet port 1060a may be positioned corresponding to one end of the rotation shaft 230a.

At this time, the first compression space 210a and the body space 260a are provided in an open state. For example, a configuration for preventing leakage of refrigerant may not be installed between the first compression space 210a and the body space 260a.

Accordingly, the first stage compressed refrigerant flows into the body space 260a. In addition, a refrigerant (hereinafter, an injection refrigerant) flowing through the injection pipe 104 flows into the main body space 260a. At this time, the injection refrigerant port 1040a is formed on one side in the radial direction of the body space 260a, and the injection refrigerant flows in the radial direction of the body space 260a.

The first stage compressed refrigerant and the injection refrigerant may be mixed in the main body space 260a. Hereinafter, it is referred to as a mixed refrigerant. The mixed refrigerant may flow the body space 260a and cool the internal structure of the body space 260a. In particular, the mixed refrigerant may cool the motor 240a.

In addition, the mixed refrigerant may cool not only the motor 240a but also other components accommodated in the body space 260a. In detail, the mixed refrigerant flows along the rotating shaft 230a and can cool the rotating shaft 230a.

Then, the mixed refrigerant flows into the second compression space 220a through the compression pipe 290. At this time, the first connection port 2900 is formed on one side in the radial direction of the body space 260a, and the second connection port 2902 is formed on one side in the axial direction of the second compression space 220a. do.

Accordingly, refrigerant is introduced into the second compression space 220a in the axial direction through the compression pipe 290. In particular, the second connection port 2902 may be positioned corresponding to one end of the rotating shaft 230a. That is, the refrigerant inlet port 1060a and the second connection port 2902 may be disposed at both ends of the rotating shaft 230a.

The refrigerant flowing into the second compression space 220a is compressed by the second impeller 222a. At this time, the refrigerant (mixed refrigerant) flowing into the second compression space 220a may have a lower temperature than the refrigerant discharged from the first compression space 210a (one-stage compressed refrigerant).

Then, the refrigerant compressed by the second stage by the second impeller 222a (hereinafter, the second stage compressed refrigerant) flows to the condenser 150 along the compressor discharge pipe 108. At this time, the refrigerant discharge port 1080a is formed on one side in the radial direction of the second compression space 220.

Through the flow of the refrigerant, the compressors 200 and 200a according to the spirit of the present invention 1) cool the internal components including the motors 240 and 240a, and 2) lower the temperature of the compressed refrigerant in one stage 2 However, it can be provided in a compressed space. In addition, this can be achieved by changing the flow direction of the refrigerant without adding a separate configuration.

10: chiller system 100: chiller unit
104: injection piping 106: compressor inlet piping
108: compressor discharge pipe 140: condenser
150: evaporator 200: compressor
212: 1st impeller 214: 2nd impeller
230: rotating shaft 240: motor
280, 290: Connection piping

Claims (15)

A main body space in which a motor for driving the rotating shaft is installed;
A first compression space in which a first impeller that is rotated by the rotation shaft to compress refrigerant is installed;
A second compression space which is rotated by the rotation shaft and is installed with a second impeller for compressing the refrigerant compressed by the first impeller;
A refrigerant inflow port formed at one side of the first compression space so that the refrigerant flows into the first compression space;
A refrigerant discharge port formed on one side of the second compressed space so that the compressed refrigerant is discharged from the second space;
An injection refrigerant port formed on one side of the main body space to introduce the refrigerant into the main body space; And
A compression pipe connecting any one of the first compression space and the second compression space to the body space;
Compressor comprising a. According to claim 1,
A first connection port formed on one side of the first compression space; And
A second connection port formed on one side of the body space; is further included,
The compression pipe is a compressor, characterized in that for connecting the first connection port and the second connection port. According to claim 2,
The refrigerant flowing into the first compression space through the refrigerant inlet port is compressed by the first impeller and discharged to the first connection port,
The refrigerant discharged to the first connection port flows to the second connection port along the compression pipe,
The refrigerant flowing into the body space through the second connection port is mixed with the refrigerant flowing into the body space through the injection refrigerant port,
The mixed refrigerant flows into the second compression space, and is compressed by the second impeller to be discharged to the refrigerant discharge port. According to claim 2,
The second connection port is formed on one side in the axial direction of the body space,
The injection refrigerant port is characterized in that the compressor is formed on one side in the radial direction of the body space. According to claim 1,
The first impeller and the second impeller are coupled to one side of the rotating shaft,
The first compression space, the second compression space and the main body space, characterized in that the compressor is arranged in sequence. According to claim 1,
A first connection port formed on one side of the body space; And
A second connection port formed on one side of the second compression space; is further included,
The compression pipe is a compressor, characterized in that for connecting the first connection port and the second connection port. The method of claim 6,
The refrigerant flowing into the first compression space through the refrigerant inlet port is compressed by the first impeller and flows into the body space,
The refrigerant flowing into the body space is mixed with the refrigerant flowing into the body space through the injection refrigerant port, and the refrigerant flowing into the body space through the second connection port,
The mixed refrigerant flows through the first connection port to the second connection port along the compression pipe,
The refrigerant flowing into the second compression space through the second connection port is compressed by the second impeller and is discharged to the refrigerant discharge port. The method of claim 6,
The first connection port and the injection refrigerant port is characterized in that the compressor is formed on one side in the radial direction of the body space. According to claim 1,
The first impeller and the second impeller are respectively coupled to both sides of the rotating shaft,
Compressor characterized in that the first compression space and the second compression space are arranged on both sides of the body space. A body space in which a motor for driving the rotating shaft is installed;
A compression space in which an impeller is rotated by the rotating shaft to compress a refrigerant;
A compressor inlet pipe connecting the compression space and the evaporator so that the refrigerant discharged from the evaporator flows into the compression space;
A compressor discharge pipe connecting the compressed space and the condenser so that the refrigerant compressed in the compressed space flows to the condenser;
A connecting pipe connecting the evaporator and the condenser;
An injection pipe connecting one side of the connection pipe and the body space so that a part of the refrigerant flowing from the condenser to the evaporator flows into the body space;
A compression pipe connecting the compression space and the body space;
This includes chiller system. The method of claim 10,
In the compressed space,
A first compression space in which a first impeller that is rotated by the rotation shaft to compress refrigerant is installed; And
And a second compression space in which a second impeller is installed to compress the refrigerant compressed in the first impeller by being rotated by the rotation shaft. The method of claim 11,
The refrigerant inlet port is formed on one side of the first compression space so that the refrigerant discharged from the evaporator flows into the first compression space,
The refrigerant discharge port, a chiller system characterized in that formed on one side of the second compression space, so that the refrigerant compressed in the second space is discharged to the condenser. The method of claim 11,
The compression pipe is a chiller system, characterized in that any one of the first compression space and the second compression space is connected to the main body space. The method of claim 13,
The compression piping allows the refrigerant compressed in the first compression space to flow into the body space. A chiller system characterized by connecting a first connection port formed on one side to the first compression space and a second connection port formed on one side of the body space. The method of claim 13,
The compression piping allows the refrigerant flowing into the main body space to flow into the second compression space. A chiller system characterized by connecting a first connection port formed on one side to the body space and a second connection port formed on one side of the second compression space.

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