KR102037239B1 - Ciller unit and Chiller system including the same - Google Patents

Abstract

The present invention relates to a chiller unit and a chiller system including the same. In a chiller unit according to the spirit of the present invention, in a chiller unit including a compressor, an evaporator and a condenser, an oil tank provided in the compressor, an oil pump for supplying oil to the compressor, refrigerant and oil discharged from the compressor An oil separator separating the oil separator and the oil separator, the evaporator, and the oil pump; and the oil pump flows the oil introduced through the oil recovery pipe into the oil tank. The oil sucked from the tank is supplied to the compressor.

Description

Chiller unit and chiller system including same {Ciller unit and Chiller system including the same}

The present invention relates to a chiller unit and a chiller system including the same.

Generally, a chiller system means a system for supplying cold water to a demand source. In detail, the chiller system is characterized by cooling the cold water by heat exchange between the refrigerant circulating the refrigerant cycle and the cold water circulating the demand destination. In addition, the chiller system is a relatively large capacity equipment, and can be installed in a large building.

1 is a view showing a conventional chiller system.

Referring to FIG. 1, a conventional chiller system 1 includes a chiller unit and a consumer 6. The demand source 6 may be understood as an air conditioner using cold water as an example.

The chiller unit includes a compressor (2) for compressing a refrigerant, a condenser (3) for condensing the refrigerant compressed by the compressor (2), and an expansion device (4) for reducing the refrigerant condensed in the condenser (3). And an evaporator 5 for evaporating the refrigerant decompressed in the expansion device 4.

The refrigerant may be heat-exchanged with the outside air in the condenser 3, and may be heat-exchanged with cold water in the evaporator (5).

The chiller system 1 is connected to the evaporator 5 and the demand destination 6 to provide a cold water pipe 8 for circulating cold water and a cold water pipe 8 to generate a cold water flow force. It includes (7).

When the pump 7 is operated, cold water can flow from the demand source 6 to the evaporator 5 and from the evaporator 5 to the demand destination 6 via the cold water piping 8. have.

The evaporator 5 is provided with a coolant flow path 5a through which a coolant flows and a cold water flow path 5b through which cold water flows. The coolant in the coolant channel 5a and the cold water in the cold water channel 5b may be indirectly exchanged with each other.

The chiller unit may be provided in various sizes or capacities. Here, the size or capacity of the chiller unit, as a concept corresponding to the capacity of the refrigeration system, that is, the freezing capacity, may be expressed in units of refrigeration tones (RT).

The chiller unit may be provided as a facility having a variety of refrigeration tones, depending on the size of the building, etc., the chiller unit is installed, the capacity of cold water circulated or air conditioning capacity. For example, the chiller unit may be manufactured to have a capacity of 200RT, 500RT, 1000RT, 1500RT, 2000RT, 3000RT and the like.

In addition, the chiller unit is provided with an oil passage for supplying oil to the compressor (2). In general, the oil channel of the conventional chiller unit is provided with an ejector (ejector) for recovering the refrigerant discharged from the compressor (2).

The ejector corresponds to a device for generating a negative pressure to suck the working fluid. In detail, when relatively high pressure fluid passes through the ejector, relatively low pressure fluid is sucked into the ejector by negative pressure. In this way, oil is recovered by passing a high pressure refrigerant flowing through the compressor 2 or the condenser 3 through the ejector.

However, such a structure has a problem in that the oil piping is complicated and the necessary airflow for working the piping is excessively input. In addition, the temperature difference between the condenser and the evaporator is small when operating at a partial load there is a problem that the oil recovery is not normal to the ejector.

The present invention provides a chiller unit having an oil pipe for effectively recovering oil without using the ejector, and a chiller system including the same.

In addition, there is provided a chiller unit and a chiller system comprising the oil pump gear for oil supply and recovery is provided in the oil pump installed in the oil pipe.

In the chiller unit according to the spirit of the present invention, in a chiller unit including a compressor, an evaporator and a condenser, an oil tank provided in the compressor, an oil pump for supplying oil to the compressor, refrigerant and oil discharged from the compressor An oil separator separating the oil separator and the oil separator, the evaporator, and the oil pump; and the oil pump flows the oil introduced through the oil recovery pipe into the oil tank. The oil sucked from the tank is supplied to the compressor.

The oil pump may include an oil pump motor providing a driving force, an oil pump rotating shaft rotated by the oil pump motor, and an oil pump gear disposed at both ends of the oil pump rotating shaft.

The oil pump gear is disposed at one end of the oil pump rotation shaft. A first oil pump gear for supplying the oil sucked from the oil tank to the compressor and a second oil pump disposed at the other end of the oil pump rotation shaft to flow oil introduced through the oil pipe into the oil tank. Gears may be included.

The oil pump gear includes a first oil pump gear having at least one first suction port connected to the oil tank, at least one first discharge port connected to an oil supply pipe extending to the compressor, and the oil recovery. A second oil pump gear having at least one second suction port connected to the pipe and at least one second discharge port connected to the oil tank may be included.

The oil pump gear may include a first oil pump gear that sucks oil in a radial direction of the oil pump rotation shaft and discharges oil in an axial direction, and discharges oil in a radial direction by sucking oil in an axial direction of the oil pump rotation shaft. A second oil pump gear may be included.

The oil pump may be disposed on one side of the compressor to be connected to the oil tank.

The oil pump may be disposed such that the oil tank is located in a radial direction of the oil pump rotation shaft.

In the oil recovery pipe, a first oil recovery pipe extending from the oil separator, a second oil recovery pipe extending from the evaporator and the first oil recovery pipe and the second oil recovery pipe are laminated to extend to the oil pump. The third oil recovery pipe may be provided.

The third oil recovery pipe may be connected to one side of the oil pump, and the oil supply pipe extending to the compressor may be connected to the other side of the oil pump.

An oil supply pipe connecting the oil pump and the compressor may be further included.

The oil supply pipe may be provided with an oil cooler for cooling the oil.

The refrigerant separated by the oil separator may be introduced into the compressor by the rotation of the impeller provided in the compressor.

In addition, in the chiller system according to the spirit of the present invention, a compressor for compressing a refrigerant, a condenser in which the coolant discharged from the compressor and the coolant circulating in the cooling water circulation passage are heat exchanged, and cold water flowing in the coolant discharged from the condenser and the cold water circulating passage. And an oil pump connected with an oil supply pipe for supplying oil to the compressor and an oil recovery pipe for recovering oil discharged from the compressor.

The oil recovery pipe may include a first oil recovery pipe through which the separated oil of the refrigerant discharged from the compressor flows, a second oil recovery pipe through which the oil introduced into the evaporator flows, and the first oil recovery pipe and the second oil recovery pipe. The oil recovery pipe is laminated may be provided with a third oil recovery pipe extending to the oil pump.

The oil pump may include a first oil pump gear connected to the oil supply pipe and a second oil pump gear connected to the oil recovery pipe.

According to the present invention, there is an advantage that the supply of oil to the compressor and the recovery of the oil discharged from the compressor can be performed simultaneously by driving the oil pump.

In other words, there is no need to provide a separate power source for oil recovery, such as an ejector.

In addition, since the oil recovery power source such as the ejector is removed, the oil pipe is more easily provided, thereby increasing the price competitiveness and the convenience of installation according to the material saving.

In addition, the oil pump can flow oil regardless of the load of the system, it is possible to ensure the reliability of the flow of oil at partial load.

In particular, since oil pump gears for supplying and recovering oil are provided at both ends of the oil pump rotating shaft provided in the oil pump, there is an advantage that an additional driving device is not required.

In addition, as the oil pump rotation shaft is rotated, the first oil pump gear supplies oil from the oil tank to the compressor, and the second oil pump gear recovers oil from the oil tank.

1 is a view showing a conventional chiller system.
2 is a view showing a chiller system according to an embodiment of the present invention.
3 is a view schematically showing the configuration of a chiller unit according to an embodiment of the present invention.
4 is a diagram conceptually illustrating the chiller unit of FIG. 3 together with a flow of a refrigerant.
5 is a view conceptually illustrating the chiller unit of FIG. 3 together with the flow of oil.
6 is a view illustrating an oil pump of a chiller unit according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, when it is determined that a detailed description of a related well-known configuration or function interferes with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

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

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

As shown in FIG. 2, the chiller system 10 according to the spirit of the present invention includes a chiller unit 100 in which a refrigeration cycle is formed, a cooling tower 20 for supplying cooling water to the chiller unit 100, and the It includes a cold water demand 30 for circulating the cold water heat exchanged with the chiller unit 100.

In this case, the cold water demand 30 may be understood as a device or space for performing air conditioning using cold water.

Between the chiller unit 100 and the cooling tower 20, a cooling water circulation passage 40 is provided. The cooling water circulation passage 40 is a pipe for guiding the cooling water to circulate the cooling tower 20 and the chiller unit 100.

In the cooling water circulation passage 40, the cooling water inlet passage 42 for guiding the cooling water to the chiller unit 100 and the cooling water heated in the chiller unit 100 to guide the flow to the cooling tower 20 Cooling water discharge path 44 may be included.

At least one of the cooling water inflow passage 42 and the cooling water discharge passage 44 may be provided with a cooling water pump 46 driven to flow the cooling water. For example, FIG. 2 shows that the cooling water pump 46 is provided in the cooling water inflow channel 42.

The cooling water discharge channel 44 may be provided with a water extraction temperature sensor 47 that detects a temperature of the cooling water flowing into the cooling tower 20. In addition, the cooling water inlet passage 42 may be provided with an inlet temperature sensor 48 for sensing a temperature of the cooling water discharged from the cooling tower 20.

Between the chiller unit 100 and the cold water demand 30, a cold water circulation passage 50 is provided. The cold water circulation passage 50 is a pipe for guiding cold water to circulate the cold water demand 30 and the chiller unit 100.

In the cold water circulation passage 50, the cold water inlet passage 52 for guiding cold water to the chiller unit 100 and the cold water cooled in the chiller unit 100 flows to the cold water demand destination 30. Cold water discharge passage 54 may be included.

At least one of the cold water inflow passage 52 and the cold water outlet passage 54 may be provided with a cold water pump 56 driven for the flow of cold water. For example, FIG. 2 shows that the cold water pump 56 is provided in the cold water inflow passage 52.

In this case, the cold water demand destination 30 may be a water-cooled air conditioner that heat-exchanges air with cold water.

For example, the cold water demand unit 30 is an air handling unit (AHU, Air Handling Unit) for mixing the indoor air and the outdoor air and heat the mixed air with cold water to discharge the indoor air, the indoor air is installed It may include at least one unit of a fan coil unit (FCU, Fan Coil Unit) for discharging into the room after heat exchange with cold water and a floor piping unit embedded in the floor of the room.

In FIG. 2, the cold water demand 30 is shown as being composed of an air handling unit.

The cold water demand unit 30 constituted by the air handling unit is provided at both sides of a casing 61, a cold water coil 62 installed inside the casing 61, and a cold water coil 62 through which cold water passes. And it may include a blower (63, 64) for sucking the indoor air and outdoor air to blow into the room.

The blowers 63 and 64 may include a first blower 63 for allowing indoor air and outdoor air to be sucked into the casing 61 and a second air for allowing air to be discharged to the outside of the casing 61. Blower 64 may be included.

In the casing 61, an indoor air suction unit 65, an indoor air discharge unit 66, an external air suction unit 67, and an air conditioning air discharge unit 68 may be formed.

When the blowers 63 and 64 are driven, some of the air sucked into the indoor air suction unit 65 is discharged to the indoor air discharge unit 66 and discharged to the indoor air discharge unit 66. The remainder not mixed with the outdoor air sucked into the outside air suction unit 67 is exchanged with the cold water coil 62.

In addition, the mixed air heat-exchanged (cooled) with the cold water coil 62 may be discharged into the room through the air conditioning air outlet 68. Through this process it is possible to supply a harmonious air to the room to cool the indoor space.

In addition, the cold water demand destination 30 may correspond to a facility that directly uses cold water. For example, the cold water demand source 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 may supply the cooling water to the hot water demand destination, not the cooling tower 20.

That is, the chiller system 10 according to the spirit of the present invention is not limited to the configuration shown in FIG. 2 and may be provided in various configurations. Hereinafter, the chiller unit 100 connected to the cooling water circulation passage 40 and the cold water circulation passage 50 will be described in detail.

3 is a view schematically showing the configuration of a chiller unit according to an embodiment of the present invention.

As shown in FIG. 3, the chiller unit 100 according to the spirit of the present invention includes a compressor 110, the evaporator 150, and the condenser 140.

The compressor 110 is a component for compressing the refrigerant. Compressor 110 according to the spirit of the present invention may be provided as a centrifugal compressor. Centrifugal compressors are understood as compressors in which a refrigerant is compressed and discharged by converting kinetic energy of the refrigerant into static pressure energy through a rotating body such as an impeller or a blade.

The condenser 140 is configured to exchange heat between the refrigerant discharged from the compressor 110 and the coolant flowing through the coolant circulation passage 40. That is, the refrigerant compressed from the compressor 110 may flow into the condenser 140. The evaporator 150 is configured to exchange heat between the refrigerant discharged from the condenser 140 and the cold water flowing through the cold water circulation passage 50.

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 110 is installed on the top of the evaporator 150. Such an arrangement is exemplary and the compressor 110, 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 the axial direction. The condenser body 170 and the evaporator body 180 may be provided to have the same axial length and may be 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 so that the bottom surface and the axial direction is parallel.

Both ends of the condenser body 170 and the evaporator body 180 are coupled to the plates 172 and 182 for installation, respectively. The plates 172 and 182 may be provided in a quadrangular 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 coupled to a leg 171 provided flat on the bottom surface to be stably installed on the bottom surface. The evaporation plate 182 may have a lower end coupled with an upper end of the condensation plate 172. At this time, each coupling may be coupled through a coupling member by a bolt or the like, or may be coupled by welding or the like.

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

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

The cooling water accommodating part 174 and the cold water accommodating part 184 have cooling water combining parts 176 and 177 and cold water combining parts 186 and 187 that are combined with the cooling water circulation passage 40 and the cold water circulation passage 50. ) Is provided.

In detail, the coolant accommodating part 174 includes a first coolant coupler 176 coupled to the coolant inlet 42 and a second coolant coupler 177 coupled to the coolant outlet 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 discharge passage 54. Can be

Referring to FIG. 3, the first cold water combining unit 186, the second cold water combining unit 187, the first cooling water combining unit 176, and the second cooling water combining unit 187 are sequentially disposed up and down. Can be arranged. However, such an arrangement is understood to be illustrative.

In addition, the chiller unit 100 according to the spirit of the present invention may include a control box 160 having 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.

In addition, the chiller unit 100 according to the spirit of the present invention, the economizer (Economizer) 130 and the expansion device is provided. The economizer 130 may be provided on one side of the evaporator 150.

The economizer 130 is a means for separating the refrigerant gas generated from the refrigerant discharged from the condenser 140. Accordingly, the refrigerant gas separated from the economizer 130 flows into the compressor 110 and the refrigerant liquid flows into the evaporator 150.

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

4 is a diagram conceptually illustrating the chiller unit of FIG. 3 together with a flow of a refrigerant. In FIG. 4, the flow of the refrigerant is briefly shown through the refrigerant pipe, and the flow of cold water and cooling water in the evaporator 150 and the condenser 140 is schematically illustrated.

 As shown in FIG. 4, the compressor 110 includes an impeller 112 for compressing a refrigerant. In particular, the compressor 110 may be provided as a multistage compression centrifugal compressor including a plurality of impellers. Accordingly, the compressor 110 is provided with a pair of impellers 112 sequentially arranged in the flow direction of the refrigerant.

In addition, the compressor 110 is provided with a motor assembly 114 providing a driving force to the impeller 112 and a rotating shaft 116 connecting the motor assembly 114 and the impeller 112.

In FIG. 4, a pair of impellers 112 are sequentially disposed on one side of the rotation shaft 116, but a pair of impellers 112 may be disposed on both sides of the rotation shaft 116, respectively.

In addition, an oil tank 120 in which oil is stored may be provided inside the compressor 110. This will be described later in detail with reference to FIG. 5.

The rotating shaft 116 is rotated by the driving of the motor assembly 114 and the impeller 112 compresses the refrigerant. The compressed refrigerant is flowed to the condenser 140.

The refrigerant discharged from the compressor 110 exchanges heat with the cooling water in the condenser 140. In detail, the refrigerant flowing in the compressor 110 is introduced into the condenser main body 170, and is in contact with the cooling water flowing through the plurality of cooling water pipes 175 provided in the condenser main body 170. .

The refrigerant condensed by the heat exchange of the cooling water flows to the economizer 130. A suction expansion device 131 is installed at the suction side of the economizer 130 to expand the refrigerant flowing from the condenser 140.

The refrigerant gas separated from the economizer 140 flows into the compressor 110, and the refrigerant liquid flows into the evaporator 150. At this time, a discharge expansion device 132 is provided on the discharge side of the economizer 130 to expand the refrigerant flowing to the evaporator 150.

At this time, the configuration of the economizer 130 and the expansion device (131, 132) is illustrative and can be arranged in various numbers and places.

The refrigerant flowing through the economizer 130 to the evaporator 150 is heat-exchanged with cold water in the evaporator 150. In detail, the refrigerants are introduced into the evaporator body 180 and heat exchange with each other while contacting the cold water flowing through the plurality of cold water pipes 185 provided in the evaporator body 180.

The refrigerant evaporated by heat exchange with cold water may flow to the compressor 110 and may circulate the above process.

As described above, since the compressor 110 is provided with a rotating unit, lubrication is required for normal operation. Compressor 110 according to the spirit of the present invention uses a lubrication method by oil, and thus the chiller unit 100 is provided with an oil pipe through which the oil flows.

Hereinafter, the flow of the oil will be described in detail.

5 is a view conceptually illustrating the chiller unit of FIG. 3 together with the flow of oil. In FIG. 5, the flow of the refrigerant is illustrated by a dotted line, and the oil pipe through which the oil flows is illustrated by a solid arrow.

As shown in FIG. 5, the chiller unit 100 according to the spirit of the present invention separates an oil pump 200 for supplying oil to the compressor 110 and a refrigerant discharged from the compressor 110. The oil separator 210 is included.

In addition, the oil pipe through which the oil flows includes an oil supply pipe 202 through which oil flows to the compressor 110, and an oil recovery pipe 220 for recovering oil discharged from the compressor 110.

The oil supply pipe 202 is provided to connect one side of the oil pump 200 and the compressor 110. In addition, the oil supply pipe 202 may be provided with an oil cooler 204 for cooling the oil, a one-way valve 206 for flowing in the direction of the compressor 110 of the oil.

The oil recovery pipe 220 is provided to connect the compressor 110, the evaporator 150 and the oil pump 200. This is to separate the oil contained in the refrigerant discharged from the compressor 110 and the oil introduced into the evaporator 150 to recover it again.

In addition, as can be seen in Figure 5, the oil pipe is not connected to the condenser 140. This is because the pressure discharged from the compressor 110 is difficult to flow into the condenser 140 due to the high pressure of the condenser 140. Therefore, the oil recovery pipe 220 according to the yarn of the present invention can be connected to only the essential configuration to recover the oil.

As such, the oil pump 200 is connected to the oil supply pipe 202 for supplying oil to the compressor 110 and the oil recovery pipe 220 for recovering oil discharged from the compressor 110. . In detail, the oil pump 200 flows the oil introduced through the oil recovery pipe 202 into the oil tank 120, and passes the oil sucked from the oil tank 120 to the compressor 110. Supply.

In addition, the oil pump 200 may be disposed on one side of the compressor 110 to be connected to the oil tank 120. This is exemplary, and the oil pump 200 is sufficient to be connected to the oil tank 120 and the oil flows.

The oil recovery pipe 220, the first oil recovery pipe 222 extending from the oil separator 210, the second oil recovery pipe 224 extending from the evaporator 150 and the first oil recovery pipe. 222 and the second oil recovery pipe 224 may be laminated to be provided with a third oil recovery pipe 226 extending to the oil pump 200.

In this case, a portion where the first oil recovery pipe 222 and the second oil recovery pipe 224 are laminated is referred to as an 'oil lamination unit 228' for convenience.

Accordingly, the first oil recovery pipe 222 is understood as a pipe connecting the oil separator 210 and the oil lamination part 228. In addition, the first oil recovery pipe 222 may include a pipe connecting the compressor 110 and the oil separator 210. In this case, the refrigerant separated from the oil separator 210 may be introduced into the compressor 110 by the rotation of the impeller 112.

In addition, the second oil recovery pipe 224 is understood as a pipe connecting the evaporator 150 and the oil-laminated portion 228. At this time, one end of the second oil recovery pipe 224 connected to the evaporator 150 may be coupled to the upper end of the evaporator 150 to flow the oil located in the upper portion of the refrigerant.

In addition, the third oil recovery pipe 226 is understood as a pipe connecting the oil-laminated portion 228 and the oil pump 200. At this time, one end of the third oil recovery pipe 226 is connected to one side of the oil pump 200.

In addition, the first oil recovery pipe 222, the second oil recovery pipe 224 and the third oil recovery pipe 226, the first valve 221, the second valve 223 for opening and closing the flow of oil. ) And the third valve 225 may be provided respectively.

In addition, the oil pipe may be provided with a filter (straniner) for removing foreign substances in the oil flowing, a filter drier (filter drier) for absorbing the water in the oil.

As shown in FIG. 5, the third oil recovery pipe 226 is connected to one side of the oil pump 200, and the oil supply pipe 202 is connected to the other side of the oil pump 200. . That is, the third oil recovery pipe 226 and the oil supply pipe 202 are coupled to face the oil pump 200.

Hereinafter, the internal configuration of the oil pump 200 will be described in detail.

6 is a view illustrating an oil pump of a chiller unit according to an embodiment of the present invention.

As shown in FIG. 6, the oil pump 200 includes an oil pump motor 202 providing a driving force, an oil pump rotating shaft 204 rotated by the oil pump motor 202, and the oil pump rotating shaft ( Oil pump gears 206 and 208 disposed at both ends of 204 are included.

In this case, the oil pump 200 may be disposed such that the oil tank 120 is positioned in a radial direction of the oil pump rotation shaft 204. That is, in FIG. 6, the oil pump rotation shaft 204 may be provided in the vertical direction, and the oil tank 120 may be disposed on the left side of the oil pump 200. However, this is an exemplary shape and is not limited to this arrangement.

The oil pump motor 202 may be provided in a separate configuration from the motor assembly 114 provided in the compressor 110. In addition, the oil pump motor 202 may be omitted and the oil pump rotation shaft 204 may be rotated by the driving force of the motor assembly 114.

The oil pump gears 206 and 208 may be understood as a device that sucks fluid in one direction and flows in a direction perpendicular thereto. For example, the oil pump gears 206 and 208 may be provided with a trocoid gear. The trocoid gear is omitted in the general description.

The oil pump gear includes a first oil pump gear 206 disposed at one end of the oil pump rotation shaft 204 and a second oil pump gear 208 disposed at the other end of the oil pump rotation shaft 204. Included.

The first oil pump gear 206 and the second oil pump gear 208 are rotated as the oil pump rotation shaft 204 is rotated. That is, the first oil pump gear 206 and the second oil pump gear 208 flow oil as the oil pump rotation shaft 204 is rotated.

In detail, the first oil pump gear 206 supplies the oil sucked from the oil tank 120 to the compressor 110. The first oil pump gear 206 has at least one first suction port 206a connected to the oil tank 120 and at least one oil supply pipe 202 extending to the compressor 110. The first discharge port 206b is provided.

In this case, referring to FIG. 6, the first oil pump gear 206 sucks oil in the radial direction of the oil pump rotation shaft 204 and discharges oil in the axial direction. That is, the first suction port 206a is provided perpendicular to the oil pump rotation shaft 204, and the first discharge port 206b is provided parallel to the oil pump rotation shaft 204.

On the other hand, the second oil pump gear 208 flows the oil introduced through the third oil return pipe 226 to the oil tank 120. The second oil pump gear 208 has at least one second suction port 208a connected to the third oil recovery pipe 226 and at least one second discharge port 208b connected to the oil tank 120. Is provided.

In this case, referring to FIG. 6, the second oil pump gear 208 sucks oil in the axial direction of the oil pump rotation shaft 204 and discharges oil in a radial direction. That is, the second suction port 208a is provided in parallel with the oil pump rotation shaft 204, and the second discharge port 208b is provided perpendicular to the oil pump rotation shaft 204.

Through such a structure, the oil pump 200 may be driven to simultaneously supply and recover oil. In particular, since the oil pump gears 206 and 208 are provided at both ends of the oil pump rotation shaft 204, a separate driving device is not required.

That is, the chiller unit and the chiller system including the chiller unit according to the spirit of the present invention do not need to have a separate power source for oil recovery. In detail, the ejector (ejector) is eliminated and provided as a simpler oil piping, it is possible to ensure the reliability of the oil flow under partial load.

10: chiller system 100: chiller unit
110: compressor 120: oil tank
140: condenser 150: evaporator
200: oil pump 210: oil separator
220: oil recovery pipe 206: first oil pump gear
208: 2nd oil pump gear

Claims (15)

In the chiller unit comprising a compressor, an evaporator and a condenser,
An oil tank provided in the compressor;
An oil pump for supplying oil to the compressor;
An oil separator for separating oil and refrigerant discharged from the compressor; And
Includes; an oil recovery pipe connecting the oil separator, the evaporator and the oil pump;
The oil pump,
An oil pump motor providing a driving force;
An oil pump rotating shaft rotated by the oil pump motor;
Disposed at one end of the oil pump rotary shaft. A first oil pump gear for supplying oil sucked from the oil tank to the compressor; And
And a second oil pump gear disposed at the other end of the oil pump rotation shaft to flow oil introduced through the oil recovery pipe into the oil tank. delete delete The method of claim 1,
The first oil pump gear,
At least one first suction port connected to the oil tank and at least one first discharge port connected to an oil supply pipe extending to the compressor,
The second oil pump gear,
At least one second suction port connected to the oil recovery pipe and at least one second discharge port connected to the oil tank. The method of claim 1,
The first oil pump gear sucks oil in the radial direction of the oil pump rotation shaft to discharge oil in the axial direction,
The second oil pump gear is a chiller unit, characterized in that for sucking the oil in the axial direction of the oil pump rotation shaft to discharge the oil in the radial direction. The method of claim 1,
The oil pump is a chiller unit, characterized in that disposed on one side of the compressor to be connected to the oil tank. The method of claim 6,
The oil pump is a chiller unit, characterized in that arranged in such a way that the oil tank is located in the radial direction of the oil pump rotation axis. The method of claim 1,
The oil recovery pipe,
A first oil recovery pipe extending from the oil separator;
A second oil recovery pipe extending from the evaporator; And
And a third oil recovery pipe which is laminated with the first oil recovery pipe and the second oil recovery pipe and extends to the oil pump. The method of claim 8,
The third oil recovery pipe is connected to one side of the oil pump,
The chiller unit, characterized in that the oil supply pipe extending to the compressor is connected to the other side of the oil pump. The method of claim 1,
The chiller unit further comprises an oil supply pipe connecting the oil pump and the compressor. The method of claim 10,
The chiller unit, characterized in that the oil supply pipe is provided with an oil cooler for cooling the oil. The method of claim 1,
The coolant unit separated from the oil separator is introduced into the compressor by the rotation of the impeller provided in the compressor. delete delete delete

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