KR20210092032A - Compressor and Chiller including the same - Google Patents

Abstract

The present invention relates to a compressor and a chiller including the same. According to an embodiment of the present invention, a compressor comprises: a motor having a rotation shaft; a first impeller connected to one side of the rotation shaft and connected to a first inlet through which a fluid is introduced and a first outlet through which the fluid is discharged; a second impeller connected to the other side of the rotation shaft and connected to a second inlet through which the fluid discharged to the first outlet flows, and a second outlet through which the fluid is discharged; and a motor cooling path formed so that the fluid introduced from a condenser flows and cools the windings and bearings of the motor. The motor cooling path may be connected to the first outlet. Accordingly, the refrigeration efficiency of the chiller can be improved.

Description

Compressor and Chiller including the same

The present invention relates to a compressor and a chiller including the same, and more particularly, to a compressor capable of improving refrigeration efficiency of a chiller by introducing a refrigerant cooled by a motor into an outlet of a first impeller of the compressor, and a chiller including the same is about

In general, a chiller system supplies cold water to a cold water demander, and heat exchange is performed between a refrigerant circulating in a refrigeration system and cold water circulating between a cold water demander and a refrigeration system to cool the cold water. Such a chiller system is a large-capacity facility, and may be installed in a large-scale building.

The structure of the conventional chiller system will be described as follows.

Referring to FIG. 1 , the main configuration of a conventional chiller system 1 includes a compressor 10 , a condenser 20 , an expansion mechanism 30 , and an evaporator 40 . In addition, the conventional chiller system 10 includes a refrigerant passage (A) and a motor cooling passage (B).

The compressor 10 is a device for compressing a gas such as air or refrigerant gas, and is formed to compress the refrigerant and provide it to the condenser 20 . The compressor 10 may include an impeller for compressing the refrigerant, a rotary shaft connected to the impeller, and a motor for rotating the rotary shaft.

The condenser 20 is formed so as to cool the refrigerant by exchanging heat with the high-temperature and high-pressure refrigerant discharged from the compressor 10 and passing through the condenser 20 .

The expansion mechanism 30 sends the liquid refrigerant to the evaporator 40 , and the refrigerant of high pressure passes through the expansion valve to change to low temperature and low pressure.

The evaporator 40 is formed to cool the cold water while the refrigerant evaporates.

The refrigerant passage A is a passage in which the refrigerant compressed in the compressor 10 flows from the compressor 10 to the condenser 20 , and the refrigerant condensed in the condenser 20 is transferred from the condenser 20 to the expansion mechanism 30 . A flow path, a flow path through which the refrigerant expanded by the expansion mechanism 30 flows from the expansion mechanism 30 to the evaporator 40, and a flow path through which the refrigerant evaporated in the evaporator 40 flows from the evaporator 40 to the compressor 10 made in euros.

The motor cooling flow path (B) is a flow path for cooling the heat generated by the motor rotating at high speed in the compressor (10), and some of the refrigerant condensed in the condenser (20) is discharged into the motor casing of the compressor (10). It consists of a flow path and a flow path through which the refrigerant cooled inside the motor of the compressor 10 flows to the evaporator 40 in the motor casing of the compressor 10 .

A part of the refrigerant condensed in the condenser 20 is used to cool the motor through the motor cooling passage (B). For example, about 1 to 5% of the refrigerant condensed in the condenser 20 may be used for cooling the motor.

As such, in the conventional chiller system 1, a portion of the refrigerant condensed in the condenser 20 flows into the motor, and efficiently cools the motor including the windings and bearings so that the motor can operate at an appropriate temperature. do.

However, in the conventional chiller system 1, there is a problem that the refrigerant in a gaseous state after cooling the motor flows into the evaporator 40, the refrigeration efficiency of the chiller system 1 may decrease.

An object of the present invention is to improve the refrigeration efficiency of a chiller by introducing a refrigerant cooled by a motor into an outlet of a first impeller of a compressor to be compressed by a second impeller in order to solve the above problems.

Another object of the present invention is to effectively control the operating temperature of the motor by installing a control valve in the flow path through which the refrigerant cooled by the motor flows in order to solve the above problems.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description.

Compressor according to an embodiment of the present invention for achieving the above object, a motor having a rotating shaft, connected to one side of the rotating shaft, a first inlet through which a fluid is introduced, and a first outlet connected to a first outlet through which the fluid is discharged 1 impeller, a second inlet connected to the other side of the rotation shaft, through which the fluid discharged to the first outlet flows, and a second impeller connected to the second outlet through which the fluid is discharged and the fluid introduced from the condenser flows, and a motor cooling flow path formed to cool the windings and the bearing, and the motor cooling flow path may be connected to the first outlet.

Meanwhile, the compressor according to an embodiment of the present invention for achieving the above object further includes a motor housing accommodating the motor and including a cooling fluid inlet and a cooling fluid outlet, and the motor cooling passage includes the condenser and the cooling fluid. It may be formed between the inlet and between the cooling fluid outlet and the first outlet.

Meanwhile, the compressor according to an embodiment of the present invention for achieving the above object may further include a circulation passage connected to the second outlet and the first outlet.

Meanwhile, in the compressor according to an embodiment of the present invention for achieving the above object, the motor cooling passage may be connected to the circulation passage.

Meanwhile, the compressor according to an embodiment of the present invention for achieving the above object may further include an ejector positioned at a junction where the motor cooling passage is connected to the circulation passage.

Meanwhile, the compressor according to an embodiment of the present invention for achieving the above object may further include a first control valve positioned on the motor cooling passage.

On the other hand, the compressor according to an embodiment of the present invention for achieving the above object, is mounted on the motor cooling passage, receives the measured temperature information from the temperature sensor and the temperature sensor for measuring the temperature of the refrigerant in the motor cooling passage, and receive It may further include a controller for controlling the opening degree of the first control valve based on the measured temperature information.

Meanwhile, in the compressor according to an embodiment of the present invention for achieving the above object, the controller may control the opening degree of the first control valve when the temperature of the refrigerant in the motor cooling passage is out of a preset temperature range.

On the other hand, the chiller according to an embodiment of the present invention for achieving the above object includes a condenser, an evaporator, and a compressor, the compressor is a motor having a rotating shaft, a first connected to one side of the rotating shaft, the fluid is introduced A first impeller including an inlet and a first outlet through which the fluid is discharged, a second impeller connected to the other side of the rotation shaft and including a second inlet through which the fluid discharged to the first outlet is introduced and a second outlet through which the fluid is discharged. and a motor cooling passage formed so that the fluid introduced from the condenser flows and cools the windings and bearings of the motor, and the motor cooling passage may be connected to the first outlet.

Meanwhile, in the chiller according to an embodiment of the present invention for achieving the above object, the compressor may further include a circulation passage connected to the second outlet and the first outlet, and the motor cooling passage may be connected to the circulation passage.

The details of other embodiments are included in the detailed description and drawings.

According to the present invention, there are the following effects.

A compressor and a chiller including the same according to an embodiment of the present invention can improve the refrigeration efficiency of the chiller by introducing the refrigerant cooled by the motor into the outlet of the first impeller of the compressor to be compressed by the second impeller. It works.

In addition, in the compressor and the chiller including the same according to an embodiment of the present invention, a control valve is installed in a flow path through which a refrigerant cooled by a motor flows, and the operating temperature of the motor is effectively controlled to increase the stability of the compressor operation. It works.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the description of the claims.

1 is a view showing a conventional general chiller and motor cooling structure.
2 is a view showing a chiller according to an embodiment of the present invention.
3 is a diagram illustrating a structure of a compressor and a chiller including the same according to an embodiment of the present invention.
4 is a view showing the structure of a compressor and a chiller including the same according to another embodiment of the present invention.
FIG. 5 is a diagram illustrating a structure of an ejector included in the compressor according to the embodiment shown in FIG. 4 .

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Regardless of the reference numerals, the same or similar components are assigned the same reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. Accordingly, the terms “module” and “unit” may be used interchangeably.

In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In the drawings, the thickness or size of each component is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size and area of each component do not fully reflect the actual size or area.

2 is a view illustrating a chiller 2 including a compressor 100 according to an embodiment of the present invention.

Meanwhile, the compressor 100 according to an embodiment of the present invention not only functions as a part of a chiller system, but may also be included in an air conditioner, and may be included in any device that compresses gaseous substances.

Referring to FIG. 2 , the chiller 2 according to an embodiment of the present invention includes a compressor 100 configured to compress a refrigerant, and a condenser 200 for condensing the refrigerant by exchanging heat with the refrigerant compressed in the compressor 100 and cooling water. ), an expander 300 that expands the refrigerant condensed in the condenser 200, and an evaporator 400 formed to heat-exchange the refrigerant expanded in the expander 300 with the cold water to cool the cold water with evaporation of the refrigerant. .

On the other hand, the chiller 2 according to an embodiment of the present invention includes a cooling water unit 600 that is formed to cool the cooling water heat-exchanged with the refrigerant in the condenser 200 and the cold water cooled in the evaporator 400 and the air conditioning space. It may further include an air conditioning unit 500 that heats the air to cool the air in the air conditioning space.

The condenser 200 may provide a place for exchanging the high-pressure refrigerant compressed in the compressor 100 with the coolant flowing in from the cooling water unit 600 . The compressed high-pressure refrigerant is condensed through heat exchange with cooling water.

The condenser 200 may be configured as a shell-tube type heat exchanger. Specifically, the high-pressure refrigerant compressed in the compressor 100 is introduced into the condensing space 230 corresponding to the internal space of the condenser 200 through the condenser connection passage 160 . Also, the cooling water flow path 210 through which the cooling water introduced from the cooling water unit 600 may flow may be included in the condensing space 230 .

The cooling water flow path 210 may include a cooling water inflow path 211 through which the cooling water is introduced from the cooling water unit 600 and a cooling water discharge path 212 through which the cooling water is discharged to the cooling water unit 600 . The cooling water flowing into the cooling water inlet flow path 211 exchanges heat with the refrigerant inside the condensing space 230 , and then passes through the cooling water connection flow path 240 provided at one end inside the condenser 200 or outside the cooling water discharge flow path 212 . is introduced into

The cooling water unit 600 and the condenser 200 may be connected via the cooling water tube 220 . The cooling water tube 220 may be a passage through which the cooling water flows between the cooling water unit 600 and the condenser 200 . In addition, the cooling water tube 220 may be made of a material such as rubber so that the cooling water does not leak to the outside.

The cooling water tube 220 may include a cooling water inlet tube 221 connected to the cooling water inlet passage 211 and a cooling water discharge tube 222 connected to the cooling water discharge passage 212 .

Looking at the flow of the cooling water as a whole, the cooling water after heat exchange with air or liquid in the cooling water unit 600 is introduced into the condenser 200 through the cooling water inlet tube 221 . The cooling water introduced into the condenser 200 passes through the cooling water inflow path 211, the cooling water connection path 240, and the cooling water discharge path 212 provided in the condenser 200 in turn. After heat exchange with the refrigerant, the coolant flows back into the coolant unit 600 through the coolant discharge tube 222 .

Meanwhile, the cooling water unit 600 may air-cool the cooling water that has absorbed heat of the refrigerant through heat exchange in the condenser 200 . The cooling water unit 600 includes a main body 630 , a cooling water inlet pipe 610 that is an inlet through which the cooling water that has absorbed heat through the cooling water discharge tube 222 is introduced, and the cooling water after being cooled inside the cooling water unit 600 . may be composed of a cooling water discharge pipe 620 that is an outlet to which is discharged.

The cooling water unit 600 may use air to cool the cooling water introduced into the main body 630 . Specifically, the main body 630 may include a fan for generating a flow of air, and an air outlet 631 through which air is discharged and an air inlet 632 corresponding to an inlet through which air is introduced into the body 630 . ) may be included.

After the heat exchange, the air discharged from the air outlet 631 may be used for heating. The refrigerant after heat exchange in the condenser 200 is condensed and collected in the lower portion of the condensing space 230 . The accumulated refrigerant flows into the refrigerant box 250 provided in the condensing space 230 and then flows into the expander 300 .

The refrigerant box 250 may include a refrigerant inlet 251 . The refrigerant introduced into the refrigerant inlet 251 is discharged through the expansion mechanism connecting passage 260 . The expansion mechanism connection passage 260 may include an expansion mechanism connection passage inlet 261 , and the expansion mechanism connection passage inlet 261 may be located at a lower portion of the refrigerant box 250 .

The evaporator 400 may include an evaporation space 430 in which heat exchange occurs between the refrigerant expanded in the expander 300 and the cold water. The refrigerant that has passed through the expander 300 in the expansion mechanism connection passage 260 flows to the refrigerant injection device 450 provided in the evaporator 400 through the evaporator connection passage 360, and to the refrigerant injection device 450 It spreads evenly into the evaporator 400 through the provided refrigerant injection hole 451 .

In addition, in the evaporator 400, a cold water flow path 410 including a cold water inflow path 411 through which cold water flows into the evaporator 400 and a cold water discharge path 412 through which cold water is discharged to the outside of the evaporator 400 is provided. can be provided.

The cold water is introduced or discharged through the cold water tube 420 in communication with the air conditioning unit 500 provided outside the evaporator 400 . The cold water tube 420 includes a cold water inlet tube 421 , which is a passage for the cold water inside the air conditioning unit 500 to the evaporator 400 , and a passage for the cold water after heat exchange in the evaporator 400 , to the air conditioning unit 500 . It may be composed of a phosphorus cold water discharge tube 422 . That is, the cold water inlet tube 421 communicates with the cold water inlet passage 411 , and the cold water discharge tube 422 communicates with the cold water discharge passage 412 .

Looking at the flow of cold water, the cold water passes through the air conditioning unit 500 , the cold water inlet tube 421 , and the cold water inflow passage 411 , and the inner end of the evaporator 400 or the cold water connection provided on the outside of the evaporator 400 . After passing through the flow passage 440 , the cold water is introduced back into the air conditioning unit 500 through the cold water discharge passage 412 and the cold water discharge tube 422 .

The air conditioning unit 500 may exchange heat between the cold water cooled in the evaporator 400 and the air in the air conditioning space. The cold water cooled by the evaporator 400 absorbs heat from the air in the air conditioning unit 500 to enable indoor cooling. The air conditioning unit 500 may include a cold water discharge pipe 520 communicating with the cold water inlet tube 421 and a cold water inlet pipe 510 communicating with the cold water discharge tube 422 . The refrigerant after heat exchange in the evaporator 400 is introduced back into the compressor 100 through the compressor connection passage 460 .

Compressor 100, one or more impellers 110 and 120 for sucking refrigerant in an axial direction and compressing it in a centrifugal direction, a motor 131 accommodated in a motor housing and rotating, impellers 110 and 120 and an impeller 110, A rotating shaft 132 to which the motor 131 for rotating 120 is connected, a plurality of bearings 141 supporting the rotating shaft 132 so as to be rotatable in the air, and a bearing housing 142 supporting the bearing 141. It may include a bearing unit 140 , a gap sensor (not shown) sensing a distance from the rotation shaft 132 , and a thrust bearing 150 limiting vibration of the rotation shaft 132 in an axial direction.

The impellers 110 and 120 may be formed in one stage or two stages, or may be formed in a plurality of stages. The impellers 110 and 120 are rotated by the rotating shaft 132, and the refrigerant introduced in the axial direction is compressed by rotation in the centrifugal direction to make the refrigerant high pressure.

The motor 131 may include a stator 134 and a rotor 133 to rotate the rotation shaft 132 . The rotor 133 may be disposed on the outer periphery of the rotation shaft 132 , and may be rotated together with the rotation shaft 132 . The stator 134 may be disposed inside the motor housing to surround the outer circumference of the rotor 133 . The motor 131 may have a structure that has a rotation shaft separate from the rotation shaft 132 and transmits rotational force to the rotation shaft 132 by a belt (not shown).

The rotating shaft 132 may be connected to the impellers 110 and 120 and the motor 131 . The rotation shaft 132 extends in the left-right direction of FIG. 2 . Hereinafter, the axial direction of the rotation shaft 132 means a left-right direction. When the bearing 141 and the thrust bearing 150 are magnetic bearings, the rotating shaft 132 preferably includes a metal so as to be movable by magnetic force.

In order to prevent the rotation shaft 132 from oscillating in the axial direction, the thrust bearing 150 preferably has a constant area in a plane perpendicular to the axial direction of the rotation shaft 132 . Specifically, the rotary shaft 132 may further include a rotary shaft blade 135 to move the rotary shaft 132 by the thrust bearing 150 . The rotary shaft wing 135 may have a larger area than the cross-sectional area of the rotary shaft 132 in a plane perpendicular to the axial direction. The rotary shaft blade 135 may be formed to extend in a rotational radial direction of the rotary shaft 132 .

When the bearing 141 and the thrust bearing 150 are magnetic bearings, the bearing 141 and the thrust bearing 150 may be formed of a conductor, and a coil (not shown) may be wound. In this case, the bearing 141 and the thrust bearing 150 act like a magnet by the current flowing in the wound coil.

A plurality of bearings 141 may be provided to surround the rotating shaft 132 with the rotating shaft 132 as a center, and the thrust bearing 150 is provided to extend in the rotational radial direction of the rotating shaft 132 and provided with rotating shaft blades 135 . ) may be provided adjacent to.

The bearing 141 allows the rotation shaft 132 to rotate without friction in a state suspended in the air. When the bearing 141 is a magnetic bearing, the rotating shaft 132 is levitated in the air by a magnetic force generated by a coil wound around the bearing 141 .

The thrust bearing 150 limits the movement of the rotation shaft 132 in axial vibration, and when the surge occurs, the rotation shaft 132 moves in the impeller 120 direction, and the other configuration of the compressor 100 and the rotation shaft 132 ) to prevent collisions.

The bearing 141 and the thrust bearing 150 may be magnetic bearings or air foil bearings.

When the thrust bearing 150 is an air foil bearing, the thrust bearing 150 may include a base plate (not shown), a bump foil (not shown), and a top foil (not shown).

The air foil bearing may have a form in which a plurality of sector-shaped bump foils are seated on a disk-shaped base plate, and a top foil is seated on the seated bump foils.

The base plate may have a flat top surface, and a circular hole may be included in a disk-shaped disk. A bump foil and a top foil may be attached to the upper surface through welding.

At least one mounting lug may be formed on the outside of the base plate, and the mounting lug may have a mounting groove to which a fastener may be fastened. The base plate can be mounted to other mechanical devices or the like through mounting lugs.

The bump foil may be formed in plurality, and may be formed in a fan shape. Each bump foil may include a plurality of bumps formed at regular intervals. The bump foil may be attached to the base plate via welding.

The top foil may be formed in plurality, and may be formed in a fan shape. The top foil may include a flat portion and an inclined portion, and an end of the inclined portion may be attached to the base plate by welding. The top foil may be formed in such a way that one end is fixed to the base plate and the other end is spaced apart from the plate and deformed.

The gap sensor may measure the axial movement of the rotation shaft 132 . In addition, the gap sensor may measure the movement in the vertical direction (direction orthogonal to the axial direction) of the rotation shaft 132 . The gap sensor may include a plurality of gap sensors.

For example, the gap sensor may be composed of a first gap sensor (not shown) that measures the vertical movement of the rotation shaft 132 and a second gap sensor (not shown) that measures the left and right movement of the rotation shaft 132 . there is.

Looking at the flow of the refrigerant, the refrigerant introduced into the compressor 100 through the compressor connection passage 460 is compressed in the circumferential direction by the action of the impellers 110 and 120, and then is discharged to the condenser connection passage 160. . The compressor connection passage 460 may be connected to the compressor 100 so that the refrigerant flows in a direction perpendicular to the rotation direction of the impellers 110 and 120 .

3 is a view showing the structure of the compressor 100 and the chiller 3 including the same according to an embodiment of the present invention.

Referring to the drawings, the compressor 100 includes a first impeller 110 , a second impeller 120 , a motor 131 , a first inlet 111 , a first outlet 112 , and a second inlet 121 . , a second outlet 122 , a connection flow path 180 , a first junction 181 , and a motor cooling flow path 170 .

The first impeller 110 serves to suck the refrigerant in the axial direction and compress it in the centrifugal direction (direction perpendicular to the axial direction). The first impeller 110 may be connected to one side of the rotation shaft 132 , and may be connected to a first inlet 111 through which a fluid is introduced and a first outlet 112 through which a fluid is discharged.

The first inlet 111 may be formed in a direction parallel to the axial direction of the rotation shaft 132 , and the first outlet 112 may be formed in a direction perpendicular to the axial direction of the rotation shaft 132 .

The first impeller 110 rotates by the rotating shaft 132, and compresses the refrigerant introduced in the axial direction through the first inlet 111 by rotating in the centrifugal direction, thereby making the introduced refrigerant into a high pressure. .

The refrigerant compressed by the rotation of the first impeller 110 may be discharged through the first outlet 112 .

The second impeller 120 serves to suck the refrigerant in the axial direction and compress it in the centrifugal direction like the first impeller 110 . The second impeller 120 may be connected to the other side of the rotation shaft 132 , and may be connected to a second inlet 121 through which a fluid is introduced and a second outlet 122 through which the fluid is discharged.

The second inlet 121 may be formed in a direction parallel to the axial direction of the rotation shaft 132 , and the second outlet 122 may be formed in a direction perpendicular to the axial direction of the rotation shaft 132 .

The second impeller 120 rotates by the rotation shaft 132, and the refrigerant introduced in the axial direction through the second inlet 121 is compressed by rotation in the centrifugal direction, thereby making the introduced refrigerant into a high pressure. .

The refrigerant compressed by the rotation of the second impeller 120 may be discharged through the second outlet 122 .

The connection flow path 180 may be formed between the first outlet 112 and the second inlet 121 to connect the first outlet 112 and the second inlet 121 . The refrigerant compressed by the first impeller 110 and discharged to the first outlet 112 may be introduced into the second inlet 121 through the connection flow path 180 .

The motor cooling passage 170 allows the refrigerant to flow to the motor 131 to cool the windings and bearings of the motor 131 .

The motor 131 may be cooled by the refrigerant introduced through the motor cooling passage 170 , and the refrigerant that has cooled the motor 131 may be discharged through the motor cooling passage 170 .

The motor cooling passage 170 may be connected to the first outlet 112 . Specifically, the motor cooling flow path 170 may be connected to the connection flow path 180 . The refrigerant discharged through the motor cooling passage 170 may be introduced into the second inlet 121 through the connection passage 180 .

At least a portion of the connection flow path 180 may be formed by a tube positioned outside the compressor 100 . Meanwhile, the connection flow path 180 may be formed inside the compressor 100 .

Meanwhile, the compression unit 100 may include a motor housing 136 that accommodates the motor 131 and includes a cooling fluid inlet (not shown) and a cooling fluid outlet (not shown).

The motor cooling passage 170 may include a first motor cooling passage 171 and a second motor cooling passage 172 . The first motor cooling passage 171 may be formed between the condenser 200 and the cooling fluid inlet, and the second motor cooling passage 172 may be formed between the cooling fluid outlet and the first outlet 112 . Specifically, the second motor cooling flow path 172 may be formed between the cooling fluid outlet and the first confluence point 181 of the connection flow path 180 .

The refrigerant introduced into the motor housing 136 through the first motor cooling passage 171 may cool the motor 131 , and the refrigerant that has cooled the motor 131 may be cooled through the second motor cooling passage 172 . It may flow into the connection flow path 180 . The refrigerant introduced into the connection flow path 180 may be mixed with the refrigerant discharged from the first outlet 112 , and may be compressed by the second impeller 120 .

The refrigerant cooling the motor 131 may be in a gaseous state. The gaseous refrigerant that has cooled the motor 131 may be mixed with the non-condensed gas generated without being properly compressed in the first impeller 110 and compressed again in the second impeller 120 .

Accordingly, the refrigerant that has cooled the motor 131 may be compressed in the compressor 100 without being discharged to the evaporator 400 . Accordingly, the refrigeration efficiency of the chiller 3 including the compressor 100 may be improved.

Meanwhile, the compressor 100 may further include a first control valve 173 positioned on the motor cooling passage 170 . For example, the first control valve 173 may be located on the second motor cooling passage 172 . Alternatively, the first control valve 173 may be simultaneously positioned on the first motor cooling passage 171 and the second motor cooling passage 172 , respectively. The amount of refrigerant flowing in the motor cooling passage 170 or the pressure of the refrigerant in the motor housing 136 may be adjusted according to the opening degree of the first control valve 173 .

The compressor 100 may further include a temperature sensor 174 and a controller (not shown).

The temperature sensor 174 may be mounted on the motor cooling passage 170 and measure the temperature of the refrigerant in the motor cooling passage 170 . For example, the temperature sensor 174 may be located on the second motor cooling passage 172 . Alternatively, the temperature sensor 174 may be located within the motor housing 136 .

The controller may receive the measured temperature information from the temperature sensor 174 and control the opening degree of the first control valve 173 based on the received measured temperature information. Specifically, when the temperature of the refrigerant in the motor cooling passage 170 or in the motor housing 136 is out of a preset temperature range, the controller may control the opening degree of the first control valve 173 .

When the temperature of the refrigerant is lower than the lower limit of the preset temperature range or higher than the upper limit, the controller controls the first regulating valve 173 to open less (closer) than the current state, or open more You can control it as much as possible (less immersive).

The controller may be any type of controller including memory, hardware and software.

Accordingly, the amount of refrigerant flowing in the motor cooling passage 170 or the pressure of the refrigerant in the motor housing 136 may be appropriately adjusted. Accordingly, by effectively controlling the operating temperature of the motor 131 , it is possible to increase the operating stability of the compressor 100 .

Referring to FIG. 3 , the chiller 3 according to an embodiment of the present invention may include a condenser 200 , an evaporator 400 , an expansion mechanism 300 , and a compressor 100 . In addition, the chiller 3 may include a condenser connection passage 160 , an expansion mechanism connection passage 260 , an evaporator connection passage 360 , and a compressor connection passage 460 .

The condenser 200 may be formed to cool the refrigerant by exchanging heat with the high-temperature and high-pressure refrigerant discharged from the compressor 100 and passing through the condenser 200 . The high-pressure refrigerant compressed in the compressor 100 may be introduced into the condensing space 230 corresponding to the internal space of the condenser 200 through the condenser connection passage 160 .

The expansion mechanism 300 sends the liquid refrigerant to the evaporator 400 , and the refrigerant of high pressure passes through the expansion valve to change to low temperature and low pressure. The refrigerant passing through the expander 300 in the expansion mechanism connection passage 260 may be introduced into the evaporator 400 through the evaporator connection passage 360 .

The evaporator 400 may be formed to cool the cold water while the refrigerant evaporates. The refrigerant after heat exchange in the evaporator 400 is introduced back into the compressor 100 through the compressor connection passage 460 .

The condenser 200 , the evaporator 400 , the expansion mechanism 300 , the condenser connection passage 160 , the expansion mechanism connection passage 260 , the evaporator connection passage 360 , and the compressor connection passage 460 are illustrated with reference to FIG. 2 . All of the structures described above are included.

4 is a view showing the structure of a compressor and a chiller including the same according to another embodiment of the present invention.

Referring to the drawings, the compressor 100 includes a first impeller 110 , a second impeller 120 , a motor 131 , a first inlet 111 , a first outlet 112 , and a second inlet 121 . , a second outlet 122 , a connection flow path 180 , and a motor cooling flow path 170 may be included.

The compressor 100 and the chiller 4 including the same according to another embodiment of the present invention, compared with the compressor 100 and the chiller 3 including the same according to the embodiment shown in FIG. 3 , the second outlet 122 , the first outlet 112 , and a circulation passage 190 connected to the motor cooling passage 170 may be further included. There is a difference from the compressor 100 and the chiller 3 including the compressor 100 shown in FIG. 3 only in the configuration related to the circulation passage 190 .

Accordingly, all other components except for the configuration related to the circulation passage 190 of FIG. 4 have the same operation as the components of FIG. 3 described above, and include all of the operations of the components of FIG. 3 described above.

The circulation passage 190 is a passage for circulating a portion of the refrigerant compressed by the second impeller 120 to the first outlet 112 . The capacity of the compressor 100 may be adjusted by the amount of the refrigerant circulated to the first outlet 112 among the refrigerant compressed by the second impeller 120 .

The compressor 100 may include a first housing (not shown) including a first impeller 110 , a first inlet 111 , and a first outlet 112 .

The first housing may include a first volute (not shown) and a gas chamber (not shown).

The first volute may be formed in a circular shape or an arc shape, and may be formed in a shape gradually expanding in the gas flow direction. The first volute is connected to the first impeller 110 and the first outlet 112 so that the refrigerant compressed in the first impeller 110 can flow through the first volute, and the first volute 1 The refrigerant may be discharged through the outlet 112 .

The gas chamber may be formed to be spaced apart from the first volute in the first housing, and may be formed in a circular shape or an arc shape. The gas chamber may be connected to the first outlet 112 through a plurality of gas control passages, and the gas introduced into the gas chamber may be discharged to the first outlet 112 .

The outlet end of the circulation passage 190 may communicate with the gas chamber through a circulation connection passage (not shown). Accordingly, some of the refrigerant compressed by the second impeller 120 may sequentially pass through the circulation passage 190 and the circulation connection passage to be introduced into the gas chamber. After the refrigerant introduced into the gas chamber is widely spread in the gas chamber, it may be dispersed through the gas control passage and discharged to the first outlet 112 .

The circulation passage 190 may be formed by a tube, at least a portion of which is located outside the compressor 100 . Meanwhile, the circulation passage 190 may be formed inside the compressor 100 .

Meanwhile, the circulation passage 190 may further include a second control valve 192 for controlling the flow rate of the gas passing through the circulation passage 190 . The second control valve 192 may be configured as a valve capable of adjusting the opening degree. When the opening degree of the second control valve 192 is increased, the flow rate of the refrigerant flowing into the first outlet 112 through the circulation passage 190 after being compressed by the second impeller 120 may be increased. Conversely, when the opening degree of the second control valve 192 is reduced, the flow rate of the refrigerant flowing into the first outlet 112 through the circulation passage 190 after being compressed by the second impeller 120 may be reduced.

The motor cooling passage 170 may be connected to the first outlet 112 . Specifically, the motor cooling passage 170 may be connected to the circulation passage 190 . The refrigerant discharged through the motor cooling passage 170 may flow into the first outlet 112 through the circulation passage 190 . The refrigerant introduced into the first outlet 112 may be introduced into the second inlet 121 through the connection flow path 180 .

The motor cooling passage 170 may include a first motor cooling passage 171 and a second motor cooling passage 172 . The second motor cooling passage 172 may be formed between the cooling fluid outlet of the motor housing 136 and the second junction 191 of the circulation passage 190 .

The refrigerant introduced into the motor housing 136 through the first motor cooling passage 171 may cool the motor 131 , and the refrigerant that has cooled the motor 131 may be cooled through the second motor cooling passage 172 . may be introduced into the circulation passage 190 . The refrigerant introduced into the circulation passage 190 may be mixed with the refrigerant discharged from the first outlet 112 , and may be compressed by the second impeller 120 .

The refrigerant cooling the motor 131 may be in a gaseous state. The gaseous refrigerant that has cooled the motor 131 may be mixed with the non-condensed gas generated without being properly compressed in the first impeller 110 and compressed again in the second impeller 120 .

Accordingly, the refrigerant that has cooled the motor 131 may be compressed in the compressor 100 without being discharged to the evaporator 400 . Accordingly, the refrigeration efficiency of the chiller 4 including the compressor 100 may be improved.

Referring to the drawings, the chiller 4 according to another embodiment of the present invention may include a condenser 200 , an evaporator 400 , an expansion mechanism 300 , and a compressor 100 . In addition, the chiller 4 may include a condenser connection passage 160 , an expansion mechanism connection passage 260 , an evaporator connection passage 360 , and a compressor connection passage 460 .

The condenser 200 , the evaporator 400 , the expansion mechanism 300 , the condenser connection passage 160 , the expansion mechanism connection passage 260 , the evaporator connection passage 360 , and the compressor connection passage 460 are shown in FIGS. 2 and 3 . Includes all of the structures described above in relation to.

FIG. 5 is a diagram illustrating a structure of an ejector included in the compressor according to the embodiment shown in FIG. 4 .

Referring to the drawings, the circulation passage 190 may further include an ejector 193 at a second junction 191 at which the motor cooling passage 170 is connected to the circulation passage 190 .

The ejector 193 may be installed to prevent the refrigerant flowing into the circulation passage 190 through the second motor cooling passage 172 from flowing backward in the direction from the second junction 191 to the second outlet 122 . can

The ejector 193 includes a first receiving unit 1931 , a second receiving unit 1932 , a first inlet 1933 , a second inlet 1934 , a first discharging unit 1935 , and a second discharging unit (1936) may be included.

The first accommodating part 1931 is formed of a hollow body, and is a space in which the fluid introduced through the first inlet 1933 is accommodated, and the fluid introduced through the first discharging part 1935 is accommodated in the second accommodating part 1932 . ) can be discharged.

The second accommodating part 1932 is formed of a hollow body, and is a space in which the fluid discharged through the first discharge unit 1935 and the fluid introduced through the second inlet 1934 are mixed, and the mixed fluid is the second It may be discharged to the outside of the ejector 193 through the discharge unit 1936 .

One side of the second accommodating part 1932 connected to the second discharging part 1936 may be formed in such a way that the passage area of the mixed fluid gradually decreases.

The first inlet 1933 is a passage through which the high-pressure fluid flows, and the second inlet 1934 is a passage through which the low-pressure fluid flows.

The second inlet 1934 may be formed to have a different inflow direction from the first inlet 1933 . For example, the fluid inflow direction of the second inlet 1934 and the fluid inflow direction of the first inlet 1933 may form a right angle to each other.

Within the ejector 193 , the high-pressure fluid may serve as a driving fluid. As the high-pressure fluid is discharged through the first discharge unit 1935, the pressure is lowered, and accordingly, the low-pressure fluid is introduced into the second receiving unit 1932 due to the pressure change in the second receiving unit 1932, so that the driving fluid and the driving fluid are lowered. It may be mixed together and discharged to the outside through the second discharge unit 1936 .

Meanwhile, the second discharge unit 1936 may be formed such that the passage area of the fluid is gradually increased so that the fluid in which the low-pressure fluid and the high-pressure fluid are mixed is expanded and discharged from the ejector 193 .

Meanwhile, the first discharge part 1935 may be formed such that the passage area of the fluid is gradually reduced in the flow direction of the fluid. Alternatively, the first discharge unit 1935 may be formed in such a way that the passage area of the fluid is gradually decreased in the flow direction of the fluid, and then the passage area of the fluid is gradually increased while passing through the nozzle neck (not shown). .

The first inlet 1933 may be connected to one end of the first motor cooling passage 172 , and the second inlet 1934 may be connected to one end of the circulation passage 190 connected to the second outlet 122 , , the second discharge unit 1936 may be connected to one end of the circulation passage 190 connected to the first outlet 112 .

Accordingly, the refrigerant that has cooled the motor 131 flows into the ejector 193 through the second motor cooling passage 172 , and is mixed with a portion of the refrigerant discharged from the second outlet 122 in the ejector 193 . can

The ejector 193 may be formed of a metal material such as stainless steel, copper, aluminum, or brass, but is not limited thereto.

In the compressor and the chiller including the same according to the present invention, the configuration and method of the embodiments described above are not limitedly applicable, but all or part of each embodiment may be modified so that various modifications may be made. They may be selectively combined and configured.

In the above, preferred embodiments of the present invention have been illustrated and described, but the present invention is not limited to the specific embodiments described above, and it is common in the technical field to which the present invention pertains without departing from the gist of the present invention as claimed in the claims. Various modifications may be made by those having the knowledge of, of course, and these modifications should not be individually understood from the technical spirit or perspective of the present invention.

Claims (10)

a motor having a rotating shaft;
a first impeller connected to one side of the rotation shaft and connected to a first inlet through which the fluid is introduced and a first outlet through which the fluid is discharged;
a second impeller connected to the other side of the rotation shaft and connected to a second inlet through which the fluid discharged to the first outlet is introduced, and a second outlet through which the fluid is discharged; and
A motor cooling flow path formed so that the fluid introduced from the condenser flows and cools the windings and bearings of the motor;
The motor cooling passage is connected to the first outlet. According to claim 1,
a motor housing accommodating the motor, the motor housing including a cooling fluid inlet and a cooling fluid outlet;
The motor cooling flow path,
and formed between the condenser and the cooling fluid inlet and between the cooling fluid outlet and the first outlet. According to claim 1,
The compressor further comprising a; circulation passage connected to the second outlet and the first outlet. 4. The method of claim 3,
The motor cooling flow path,
Compressor, characterized in that connected to the circulation passage. 5. The method of claim 4,
The compressor further comprising a; an ejector located at a junction where the motor cooling passage is connected to the circulation passage. 5. The method of claim 4,
The compressor further comprising a; a first control valve located on the motor cooling passage. 7. The method of claim 6,
a temperature sensor mounted on the motor cooling passage and measuring a temperature of the refrigerant in the motor cooling passage; and
and a controller receiving the measured temperature information from the temperature sensor and controlling the opening degree of the first regulating valve based on the received measured temperature information. 8. The method of claim 7,
The controller is
Compressor, characterized in that for controlling the opening degree of the first control valve when the temperature of the refrigerant in the motor cooling passage is out of a preset temperature range. condenser;
evaporator; and
Compressor; Including,
The compressor is
a motor having a rotating shaft;
a first impeller connected to one side of the rotation shaft, the first impeller including a first inlet through which a fluid is introduced, and a first outlet through which the fluid is discharged;
a second impeller connected to the other side of the rotation shaft and including a second inlet through which the fluid discharged to the first outlet is introduced, and a second outlet through which the fluid is discharged; and
A motor cooling flow path formed so that the fluid introduced from the condenser flows and cools the windings and bearings of the motor;
The motor cooling passage is a chiller, characterized in that connected to the first outlet. 10. The method of claim 9,
The compressor is
Further comprising a circulation passage connected to the second outlet and the first outlet,
The motor cooling flow path,
Chiller, characterized in that connected to the circulation passage.

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