KR101205561B1 - Water Cooling Type Air Conditioner - Google Patents

Abstract

The present invention relates to a water-cooled air conditioner that installs a liquid refrigerant injection means for guiding a refrigerant through a second heat exchanger at an inlet side of an accumulator to cool the refrigerant flowing into the accumulator.

The water-cooled air conditioner according to the present invention includes a compressor 210 for compressing a refrigerant, an accumulator 270 for filtering liquid refrigerant from the refrigerant flowing into the compressor 210, and a plate-shaped heat exchanger for the compressed refrigerant with water. The second heat exchanger 290 and the liquid refrigerant injection means 300 for guiding a part of the refrigerant heat exchanged in the second heat exchanger 290 to the accumulator 270, the compressor 210 is configured A high pressure compressor is applied. In addition, the liquid refrigerant injection means 300, the liquid refrigerant injection pipe 320, the both ends of which communicate with the inlet side of the accumulator 270 and the outlet side of the second heat exchanger 290 to guide the refrigerant, and the liquid An injection shielding valve 340 installed at one side of the refrigerant injection pipe 320 to selectively shield the liquid refrigerant injection pipe 320, and to lower the temperature and pressure of the refrigerant introduced into the liquid refrigerant injection pipe 320; It comprises a capillary tube 360. According to such a structure, there exists an advantage that the overload and damage of a compressor are prevented beforehand.

Water Cooled, Air Conditioner, Accumulator, Refrigerant Injection, Capillary Tube

Description

Water Cooling Type Air Conditioner [0002]

1 is a partial cutaway view showing the configuration of a water-cooled air conditioner according to the prior art.

2 is a bird's-eye view showing a state in which a water-cooled air conditioner according to the present invention is installed in a building.

Figure 3 is a flow chart showing the flow of air and water inside the building when the integrated water-cooled air conditioner employing one embodiment of the present invention.

4 is a bird's eye view showing a state in which a multi-type water-cooled air conditioner employing another embodiment of the present invention is installed in a building.

Figure 5 is a perspective view showing the appearance of the outdoor side constituting the main portion in the water-cooled air conditioner according to the present invention.

Figure 6 is an exploded perspective view showing the internal configuration of the outdoor side constituting the main portion in the water-cooled air conditioner according to the present invention.

7 is a block diagram showing the flow of the refrigerant and water during the cooling operation of the water-cooled air conditioner according to the present invention.

8 is a block diagram showing the flow of refrigerant and water during the heating operation of the water-cooled air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawings

100. Indoor side 110. Indoor fan

120. First heat exchanger 130. Refrigerant pipe

132. Common liquid pipes 134. Common institutions

200. Outdoor side 202. Waterway

202 '. Inlet 202 ". Outlet

204. Top cover 204 '. Reinforcement beam

205. Front panel 206. Service panel

207. Rear Panel 208. Side Panel

208 '. Heat dissipation hole 209. Base fan

210. Compressor 212. Constant Speed Compressor

214. Inverter compressor 215. Refrigerant sprayer

216. Bacteria oil pipe 217. Compressor discharge temperature sensor

218. Oil Separator 219. Oil Recovery Tube

232. Check valves 240. 4-way valves

240 '. High pressure sensor 242. 4 inlet port

244. 4-way-1 exit port 246. 4-way 2 exit port

248. 4-way 3 exit port 250. Hot gas pipe

252. Hot gas valve 260. Supercooler

262. Outdoor liquid pipe 264. Reverse feed pipe

266. Supercooled expansion valve 270. Accumulator

272. Suction pipe temperature sensor 274. Low pressure sensor

280. Control box 282. Control cover

284. Radiator 290. Second heat exchanger

292. Water pipe 293. Water pipe

294. Refrigerant entry 295. Refrigerant entry

296. Outdoor temperature sensor 298. Heat exchanger support

300. Liquid refrigerant injection means 320. Liquid refrigerant injection pipe

340. Injection shutoff valve 360. Capillary tube

 B. Building C. Cooling tower

 D. Duct H. Inlet

 R. Interior space. Sealed space

The present invention relates to a water-cooled air conditioner, and more particularly, by installing a liquid refrigerant injection means for guiding a refrigerant through a second heat exchanger to the inlet side of the accumulator to cool the refrigerant flowing into the accumulator. It relates to a water-cooled air conditioner to prevent damage to the compressor due to the inflow of.

In general, an air conditioner is a cooling / heating system that cools a room by a repetitive action of inhaling hot air in a room, exchanging heat with a low-temperature refrigerant, and then discharging it into the room. A compressor-condenser-expansion valve-evaporator that forms a series of refrigerant cycles.

In recent years, in order to improve the quality of life and to meet the needs of customers, air purification function to suck polluted air in the room outside the air conditioner and filter it into clean air and re-input it into the room, And dehumidifying function for re-inputting.

The air conditioner mainly includes an outdoor side (also referred to as an 'outdoor side' or a 'heat radiation side') installed in an outdoor space and an indoor side (also referred to as an 'indoor side' or ' A condenser (second heat exchanger) and a compressor are installed on the outdoor side, and an evaporator (first heat exchanger) is installed on the indoor side.

The air conditioner can be broadly divided into a separate type air conditioner in which the outdoor side and the indoor side are separated from each other, and an integral type air conditioner in which the outdoor side and the indoor side are integrally installed. In consideration of the installation space and noise, The trend is favored.

In addition, a water-cooled air conditioner is preferred as an alternative for reducing power consumption excessively generated when the indoor air is harmonized, and active research and development is in progress.

The water-cooled air conditioner is designed to be cooled by water, unlike the general air conditioner's condenser (second heat exchanger) in which the refrigerant is air-cooled by outdoor air, so that water and refrigerant are not mixed in the second heat exchanger. It is made up.

Hereinafter, the configuration of a water-cooled air conditioner according to the prior art will be described with reference to the accompanying drawings.

1 is a partial cutaway view showing the configuration of a water-cooled air conditioner according to the prior art.

As shown in the figure, the water-cooled air conditioner is formed by the main body 10 having a vertically long rectangular parallelepiped shape, the compressor 10, the water-cooled condenser 12, the evaporator (not shown) inside the main body 10 And an expansion device (not shown) are connected to the refrigerant pipe (not shown) to form one closed circuit.

The water-cooled condenser 12 is configured to condense the refrigerant by receiving water from the outside, and has a cylindrical appearance in which the central part is rolled up spirally in a central portion.

In addition, the water inlet pipe 14 and the water outlet pipe 16 are connected to the right outer surface of the water-cooled condenser 12 so that the water can be drained through the water after being introduced into the inside.

Although not shown, the inlet pipe 14 and the outlet pipe 16 communicate with the interior of the cooling tower to guide the water circulation between the water-cooled condenser 12 and the cooling tower.

Accordingly, when water and the refrigerant flow in the water-cooled condenser 12 in a separated state from each other, the water-cooled condenser 12 may exchange heat with the water and the refrigerant.

The compressor 11 serves to compress the refrigerant into a gaseous state of high temperature and high pressure, and the inside thereof is in communication with the water-cooled condenser 12. Therefore, the refrigerant compressed by the compressor 11 is guided to the water-cooled condenser 12, and heat exchanges with water.

Since other components except for the configuration of the water-cooled condenser 12 is the same as the configuration of a general air-cooled air conditioner, a detailed description thereof will be omitted.

However, the water-cooled type air conditioner having the above-described configuration has the following problems.

That is, a compressor applied to the water-cooled air conditioner is generally applied to a high pressure compressor. Unlike the low pressure compressor applied to the refrigerant air conditioner, the high pressure compressor has a pressure when a high temperature and high pressure refrigerant is introduced into the compressor. There is a problem that the operation stops or breaks due to a sharp increase.

In addition, when the compressor is damaged, maintenance costs such as repair costs are generated, resulting in product satisfaction complaints from the user's point of view.

Therefore, an object of the present invention is to solve the problems of the prior art as described above, by installing a liquid refrigerant injection means for guiding the refrigerant through the second heat exchanger to the inlet side of the accumulator refrigerant introduced into the accumulator It is to provide a water-cooled air conditioner to cool the.

Another object of the present invention is to provide a water-cooled air conditioner that cools the refrigerant flowing into the accumulator so that the overload of the compressor is prevented.

The water-cooled air conditioner according to the present invention for achieving the above object, the compressor for compressing the refrigerant, an accumulator for filtering the liquid refrigerant of the refrigerant flowing into the compressor, and the refrigerant compressed by the compressor And a plate-shaped second heat exchanger for exchanging heat and liquid refrigerant injection means for guiding a part of the refrigerant heat-exchanged with water in the second heat exchanger to the accumulator.

The compressor is characterized in that the high pressure compressor is applied.

The liquid refrigerant injection means is connected to the inlet side of the accumulator and the outlet side of the second heat exchanger, respectively, and the liquid refrigerant injection pipe for guiding the refrigerant flow, and the liquid refrigerant injection pipe installed at one side of the liquid refrigerant injection pipe It is characterized in that it comprises a injection shielding valve for selectively shielding and a capillary tube installed on one side of the liquid refrigerant injection pipe to lower the temperature and pressure of the refrigerant introduced into the liquid refrigerant injection pipe.

The injection shielding valve is characterized in that to shield the liquid refrigerant injection pipe during the heating operation.

At the inlet side of the accumulator, a suction pipe temperature sensor for sensing the temperature of the refrigerant flowing into the accumulator is provided.

The injection shielding valve is selectively opened when the refrigerant temperature detected by the suction pipe temperature sensor is higher than or equal to a set temperature.

The capillary is characterized in that it is provided at the end of the liquid refrigerant injection pipe.

One end of the capillary tube is connected in communication with the outdoor liquid pipe for guiding the refrigerant flow between the second heat exchanger and the indoor side.

According to the present invention having such a configuration, there is an advantage that the overload of the compressor is prevented by lowering the temperature of the refrigerant flowing into the compressor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a bird's eye view showing a state in which a water-cooled air conditioner according to the present invention is installed in a building, and FIG. 3 shows a flow of air and water inside a building when an integrated water-cooled air conditioner employing an embodiment of the present invention is operated. A flow chart is shown.

As shown in these drawings, the water-cooled type air conditioner is installed in a closed space S formed on one side of the inside of the building B. The closed space S is hermetically sealed from the outside of the building B and communicates with the indoor space R by an inlet H pierced in the ceiling so as to be able to suck indoor air.

A duct (D) for guiding the air heat-exchanged by the water-cooled air conditioner to be discharged into the room is connected to the indoor space (R). That is, the water-cooled air conditioner is connected to the indoor side 100, which sucks the indoor air and heat-exchanges it, and then discharges it back to the indoor space R, and the indoor side 100 and the refrigerant pipe (reference numeral 130 in FIG. 4). And an outdoor side 200 for heat-exchanging the refrigerant introduced through the refrigerant pipe 130 with water, and the duct D communicates the indoor side 100 with the indoor space R. .

The outdoor side 200 includes a compressor 210 and an accumulator (reference numeral 270 of FIG. 6), a second heat exchanger 290, an outdoor solenoid valve (reference numeral 234 of FIG. 7, a linear expansion valve (LEV)), and the like. Is provided, the indoor side 100 is provided with a first heat exchanger 120 and an expansion valve (not shown).

Accordingly, when the water-cooled type air conditioner operates, the air in the indoor space R flows into the ceiling through the inlet H, and the air flowing along the ceiling can be introduced into the indoor side 100.

In order to circulate the indoor air, an indoor fan 110 generating air flow is provided inside the indoor side 100, and the first heat exchanger 120 is inclined under the indoor fan 110.

The first heat exchanger 120 heats indoor air by using a refrigerant passing through the inside, and is connected to the second heat exchanger 290 and the refrigerant pipe 130 which will be described in detail below.

The coolant pipe 130 allows the coolant to circulate between the indoor side 100 and the outdoor side 200, and a single liquid refrigerant flows between the outdoor side 200 and the indoor side 100. A common liquid pipe (reference numeral 132 in FIG. 7) serving as a pipe and a common engine (reference numeral 134 in FIG. 7) serving as a single pipe through which gas refrigerant flows are provided.

That is, the common liquid pipe 132 is connected so that the second heat exchanger 290 and the first heat exchanger 120 communicate with each other, and the common engine 134 is connected to the compressor 210 and the first heat exchanger 120. Connected to communicate.

The indoor side 100 has a difference in the position of the water-cooled air conditioner is installed as an integral or separate type, but its internal configuration is not significantly different when compared with the configuration of a general indoor unit (not shown), so the detailed description will be omitted. do.

The outdoor side 200 is provided below the indoor side 100. The outdoor side 200 is a main component of the present invention, a compressor 210 for compressing a refrigerant at a high temperature and high pressure therein, and a refrigerant introduced from the compressor 210 and a cooling tower (C) installed on the roof of a building (B). A second heat exchanger 290 is provided to heat exchange the water and the refrigerant by allowing the introduced water to pass therethrough.

That is, the second heat exchanger 290 is provided with a water channel 202 in communication with the inside of the cooling tower (C), the water channel 202 is the water sent from the cooling tower (C) to the second heat exchanger (290). An inlet 202 ′ for guiding the inflow, and an outlet 202 ″ for guiding the water exchanged with the refrigerant through the second heat exchanger 290 to be introduced into the cooling tower C again. It is composed.

Hereinafter, with reference to Figure 4 will be described a state in which the water-cooled air conditioner installed in a multi-type. 4 is a bird's-eye view showing a state in which a multi-type water-cooled air conditioner employing another embodiment of the present invention is installed in a building.

As shown in the figure, when the water-cooled air conditioner is applied in a multi-type, the indoor side 100 and the outdoor side 200 are separated from each other and connected by a refrigerant pipe 130. That is, the indoor side 100 is installed on the ceiling of the indoor space (R), the outdoor side 200 is installed inside the sealed space (S), the outdoor side 200 and the indoor side (100) Is connected by the refrigerant pipe 130, the refrigerant circulates to heat exchange the air in the indoor space (R).

Although not shown, the indoor side 100 includes a first heat exchanger for exchanging indoor air with the refrigerant, and the indoor air can be discharged back to the indoor space R by the first heat exchanger. It is common that the fan 110 is further provided.

In addition, similar to the integrated water-cooled air conditioner described above, the multi-type water-cooled air conditioner includes a second heat exchanger for exchanging water and refrigerant with each other, and the circulation of the refrigerant and the water passing through the second heat exchanger is independent of the multi / integrated type. Since the same, detailed description of the other components will be omitted.

Hereinafter, the configuration of the outdoor side 200 will be described in detail with reference to the accompanying drawings.

Figure 5 is a perspective view showing the appearance of the outdoor side constituting the main portion in the water-cooled air conditioner according to the present invention, Figure 6 is an internal configuration of the outdoor side constituting the main portion in the water-cooled air conditioner according to the present invention. The exploded perspective view shown is shown, Figure 7 is a block diagram showing the flow of the refrigerant and water during the cooling operation of the water-cooled air conditioner according to the present invention.

As shown in these figures, the outdoor side 200 has a vertically long rectangular parallelepiped shape, a top cover 204 partitioning the indoor side 100 and the outdoor side 200, and a front and rear exteriors. The exterior is formed by the front panel 205 and the rear panel 207, the side panel 208 which forms the left and right side exteriors, and the base pan 209 which supports many components, respectively.

The top cover 204 is located at the upper end of the outdoor side 200 to prevent air passing through the interior side 100 from entering the outdoor side 200, and has no rectangular shape in which no hole is formed. Has

In addition, the top cover 204 also performs a role of supporting the indoor side 100 provided on the upper side. Therefore, a reinforcing beam 204 ′ is further provided at a lower edge of the top cover 204 to reinforce the strength of the top cover 204.

The front panel 205 is installed upright on the lower end of the top cover 204. The service panel 206 is formed at the center left side and the lower left / right side of the front panel 205. The service panel 206 is to allow the inside of the outdoor side 200 to be opened to the outside when an error occurs in the components installed on the outdoor side 200, the service is required, the remaining three surfaces except one side (slit ( slit) is processed.

Therefore, when the service panel 206 is rotated on the basis of the non-slit surface, the inside of the outdoor side 200 communicates with the outside to perform a service.

The front left and right ends of the front panel 205 are provided so that the front end of the side panel 208 is in contact, and the heat generated when the compressor 210 is operated on the upper side of the side panel 208 is the outdoor side. A plurality of heat dissipation holes 208 ′ cut out to be allowed to escape to the outside are punctured.

Although not shown, one side of the top cover 204, the front panel 205, the rear panel 207, and the side panel 208 includes the aforementioned common engine 134 and the common liquid pipe 132. It is obvious that a perforated connection hole may be formed so as to be connected by).

A base fan 209 is provided at the lower ends of the front panel 205, the rear panel 207, and the side panel 208. The base fan 209 supports the load of a plurality of parts, and the compressor 210 is provided at the center of the upper surface of the base fan 209.

The compressor 210 compresses the refrigerant to be high temperature and high pressure, and is provided at left and right sides, respectively. More specifically, the compressor 210 is installed on the right side of the constant speed compressor 212 for constant speed operation, and the variable speed heat pump (Variable Speed Heat Pump) is installed on the left side of the constant speed compressor 212, the variable speed It is configured to include an inverter compressor (214).

The refrigerant injector 215 is installed at the inlet side of the compressor 210. The refrigerant injector 215 prevents burnout by supplying a refrigerant when the compressor 210 is overheated according to an operating condition, and the refrigerant used here is a refrigerant discharged from the second heat exchanger 290. It is preferably configured to.

A constant oil compressor 214 is installed between the constant speed compressor 212 and the inverter compressor 214 so that the constant speed compressor 212 and the inverter compressor 214 communicate with each other. Therefore, when oil supply shortage occurs in one of the compressors 212 and 214, the compressor 210 is replenished from the other compressor to prevent the compressor 210 from being burned due to the flow rate shortage.

As the compressor 210, a low noise, high efficiency, high-pressure type scroll compressor is used. In particular, the inverter compressor 214 is an inverter scroll compressor whose rotation speed is adjusted according to the load capacity.

Therefore, when the load applied to the compressor 210 is small, the inverter compressor 214 is operated first, and when the load capacity gradually increases and cannot be handled by the inverter compressor 214 only, the constant speed compressor 212 ) Is activated.

The compressor discharge temperature sensor 217 and the oil separator 218 for measuring the temperature of the refrigerant discharged from the compressor 210 are provided at the outlet side of the compressor 210, respectively. The oil separator 218 filters the oil mixed in the refrigerant discharged from the compressor 210 to be recovered to the compressor 210.

That is, oil used to cool the frictional heat generated when the compressor 210 is driven is discharged to the outlet of the compressor 210 together with the refrigerant. The oil in the refrigerant is separated from the oil separator 218. By returning to the compressor 210 through the oil return pipe (219).

And the check valve 232 is further installed on the outlet side of the oil separator 218. The check valve 232 is configured to prevent the backflow of the refrigerant. That is, when only one of the constant speed compressor 212 or the inverter compressor 214 is operated, the compressed refrigerant is prevented from flowing back into the stationary compressor.

The oil separator 218 is configured to communicate with the four-way valve 240 by the pipe. The four-way valve 240 is arranged to change the flow direction of the refrigerant according to the cooling and heating operation, four inlet port 242, four one-way outlet port 244, four two-way outlet port 246 And a three-way three outlet port 248, each of which is an outlet of the compressor 210 (or an oil separator 218), an inlet of the compressor 210 (or an accumulator 270), and a second heat exchange. It is connected to the group 290 and the indoor side (100).

Therefore, the refrigerant discharged from the constant speed compressor 212 and the inverter compressor 214 is collected in one place, and then flows into the four-way valve 240, which is discharged from the compressor 210 at the inlet of the four-way valve 240. A high pressure sensor 240 'for checking the pressure of the refrigerant to be installed is installed.

On the other hand, a hot gas pipe (250.hot gas pipe) for allowing a portion of the refrigerant flowing into the four-way valve 240 from the oil separator 218 to the accumulator 270 to be described in detail below is It is installed through the directional valve 240.

When the hot gas pipe 250 needs to increase the pressure of the low pressure refrigerant flowing into the accumulator 270 during operation of the air conditioner, the high pressure refrigerant at the discharge port side of the compressor 210 may be directly supplied to the inlet side of the compressor 210. In this way, the hot gas pipe 250 is provided with a hot gas valve 252 which is a bypass valve to open and close the pipe.

An overcooler 260 is formed at the right rear end of the upper surface of the base fan 209. The subcooler 260 is a subcooling means for further cooling the refrigerant exchanged in the second heat exchanger 290 to be described in detail below, and the outdoor liquid pipe 262 connected to the outlet side of the second heat exchanger 290. Is formed at any position.

The subcooler 260 is formed of a double tube. That is, the outdoor liquid pipe 262 is provided on the inside, and the reverse transfer pipe 264 is formed on the outside. Accordingly, the reverse transfer pipe 264 is branched from the outlet of the subcooler 260, and the reverse transfer pipe 264 is provided with a subcooled expansion valve 266 for cooling the refrigerant by expansion.

In this case, a part of the refrigerant discharged from the subcooler 260 is introduced into the reverse transfer pipe 264 and cooled while passing through the subcooling expansion valve 266, and the cooled refrigerant cools the subcooler 260. The reflux allows the coolant inside to cool further. The countercurrent refrigerant exiting the subcooler 260 is supplied to the accumulator 270 to be described later and circulated.

On the other hand, the outlet of the subcooler 260 is provided with a liquid pipe temperature sensor 263 for measuring the temperature of the refrigerant discharged from the outdoor side 200, the subcooling inlet sensor 265 at the outlet of the subcooling expansion valve (266). Is provided to measure the temperature of the reflux refrigerant flowing into the subcooler 260, the subcooling flow flowing through the backflow refrigerant discharged from the subcooler 260 is provided with a subcooling outlet sensor (267).

Therefore, the refrigerant passing through the second heat exchanger 290 flows through the center portion, and is configured such that the low temperature refrigerant expanded by an expansion valve (not shown) flows in the opposite direction to lower the temperature of the refrigerant.

An accumulator 270 is installed at the left side of the base fan 209, that is, at the left side of the inverter compressor 214. The accumulator 270 filters the liquid refrigerant so that only the gaseous refrigerant flows into the compressor 210.

That is, when the refrigerant remaining in the liquid phase is not directly evaporated into gas among the refrigerant flowing from the indoor side 100 directly in the compressor 210, the compressor 210 forms a refrigerant as a high-temperature, high-pressure gas state refrigerant. The load is increased to cause damage to the compressor 210.

Therefore, among the refrigerants introduced into the accumulator 270, the refrigerant that is not evaporated and remains in the liquid phase is stored in the lower part of the accumulator 270 because it is relatively heavier than the refrigerant in the gas phase, and only the gaseous refrigerant in the upper portion is the compressor. Flows into 210.

In addition, the inlet side of the accumulator 270 is provided with a suction pipe temperature sensor 272 for measuring the temperature of the refrigerant sucked and a low pressure sensor 274 for checking the pressure of the refrigerant.

The suction pipe temperature sensor 272 is configured to interlock with the liquid refrigerant injection means 300 to be described below. That is, the liquid refrigerant injection means 300 is operated when the temperature of the refrigerant sensed by the suction pipe temperature sensor 272 is equal to or higher than the set temperature.

On the other hand, the control box 280 is installed on the rear side of the front panel 205. The control box 280 has a long rectangular parallelepiped shape left / right, and is selectively shielded by a control cover 282 provided on the front surface so as to rotate based on the upper end portion.

Although not shown, a control component such as a voltage transformer, a printed circuit board (PCB), a capacitor, and the like is provided inside the control box 280, and a heat radiating unit 284 formed of heat radiating fins is formed on a rear surface of the control box 280.

A second heat exchanger 290 is provided on the rear side of the control box 280. The second heat exchanger 290 is a heat exchange between the refrigerant flowing through the water and the water, and has a rectangular parallelepiped appearance in the longitudinal direction.

Although not shown, the second heat exchanger 290 is provided with a plurality of water flow tubes and refrigerant flow tubes for guiding the water and the refrigerant to flow without being mixed with each other. The plurality of water flow pipes and the refrigerant flow pipes are disposed to cross each other so as to be adjacent to each other to allow the water and the refrigerant to exchange heat with each other.

That is, a coolant flow tube (not shown) is surrounded around the water flow tube (not shown), and a water flow tube is disposed around the coolant flow tube. Therefore, the water flow pipe and the refrigerant flow pipe is preferably formed to have the same cross-sectional shape and size.

For example, it may be formed to have a regular hexagonal cross section and arranged in a honeycomb shape.

On the front surface of the second heat exchanger 290 (as shown in FIG. 6), the inlet / outlet pipes 292 and 293 and the refrigerant inlet / outlet pipe guiding water or the refrigerant to flow into and out of the second heat exchanger 290 ( 294,295).

That is, the water inlet pipe 292 and the water outlet pipe which penetrates the inside of the second heat exchanger 290 and communicates with the water flow pipe in the upper and lower right side of the second heat exchanger 290 to guide the outflow / intake of water. 293 is formed, and the water inlet pipe 292 is located below the water outlet pipe 293.

In addition, a refrigerant inlet pipe guiding flow / exit of the refrigerant by passing through the inside of the second heat exchanger 290 and communicating with the refrigerant flow tube (not shown) in the upper left / lower part of the front surface of the second heat exchanger 290 ( 294 and a refrigerant outlet pipe 295 are formed, and the refrigerant inlet pipe 294 is positioned above the refrigerant outlet pipe 295.

Therefore, when water and refrigerant flow into the second heat exchanger 290, the water is guided along the water flow tube inside the second heat exchanger 290 to move from the upper side to the lower side. On the other hand, the refrigerant introduced into the second heat exchanger 290 is guided along the refrigerant flow tube to move upward from the lower side.

That is, in the second heat exchanger 290, the water and the refrigerant flow in the opposite directions so that the heat exchange efficiency of the water and the refrigerant can be maximized.

On one side of the second heat exchanger 290, more precisely, on one side of the outlet pipe 293, an outdoor temperature sensor 296 is provided. The outdoor temperature sensor 296 is a component for measuring the temperature of the water flowing out through the outlet pipe 293 after heat exchange with the refrigerant in the second heat exchanger 290.

A heat exchanger support 298 is provided below the second heat exchanger 290. The heat exchanger support 298 is configured to support the second heat exchanger 290 so as to be spaced apart from the upper surface of the base fan 209.

That is, the upper surface of the heat exchanger support 298 has a slightly larger area than the lower surface of the second heat exchanger 290, the rear half is formed to be inclined toward the lower rear from the rear end of the upper surface. The lower end of the heat exchanger support 298 is coupled to the base fan 209 and fixed thereto.

On the other hand, the water-cooled air conditioner according to the present invention is further provided with a liquid refrigerant injection means 300 for lowering the temperature of the refrigerant flowing into the accumulator 270 when operating in the cooling mode. The liquid refrigerant injection means 300 is to prevent the stop and damage of the compressor that may occur when the high-temperature refrigerant flows into the high-pressure compressor applied to the water-cooled air conditioner.

That is, the liquid refrigerant injection means 300 guides the accumulator 270 to the accumulator 270 of a part of the refrigerant exchanged with water in the second heat exchanger 290, and the suction pipe temperature sensor 272 as described above. It is configured to interlock.

In more detail, the liquid refrigerant injection means 300 is a liquid refrigerant injection pipe 320, both ends of which are respectively connected to the inlet side of the accumulator 270 and the outlet side of the second heat exchanger 290 to guide the refrigerant flow. And a spray shield valve 340 installed at one side of the liquid refrigerant injection pipe 320 to selectively shield the liquid refrigerant injection pipe 320, and installed at one side of the liquid refrigerant injection pipe 320. It is configured to include a capillary tube 360 to lower the temperature and pressure of the refrigerant introduced into the yarn pipe (320).

In addition, the injection shielding valve 340 is selectively opened and interlocked when the refrigerant temperature detected by the suction pipe temperature sensor 272 is higher than or equal to the set temperature.

To this end, the refrigerant temperature detected by the suction pipe temperature sensor 272 is signaled and transmitted to the printed circuit board (not shown), and the printed circuit board (not shown) receives a signal to the injection shielding valve 340. Optionally apply power to open or shield.

Therefore, the injection shielding valve 340 is configured to shield the liquid refrigerant injection pipe 320 during the heating operation, and selectively open the liquid refrigerant injection pipe 320 only during the cooling operation.

The capillary tube 360 is provided at the lower end of the liquid refrigerant injection pipe 320. That is, the lower end of the capillary tube 360 is connected in communication with the outdoor liquid pipe 262 for guiding the refrigerant flow between the second heat exchanger and the indoor side, and the upper end is in communication with the lower end of the liquid refrigerant injection pipe 320.

The capillary tube 360 is formed by spirally winding a copper tube having a narrow inner diameter, and refrigerant is introduced into the injection shielding valve 340 when the capillary tube 360 is opened. The capillary tube 360 performs heat exchange with water in the second heat exchanger 290 to change the refrigerant at room temperature and high pressure to a low temperature and low pressure.

Therefore, the liquid refrigerant cooled in the capillary tube 360 is guided by the liquid refrigerant injection pipe 320 to enter the accumulator 270 inlet and has a temperature lower than that of the refrigerant passing through the accumulator 270 inlet. Therefore, high temperature refrigerant is not introduced into the compressor 210.

Hereinafter, the operation of the water-cooled air conditioner according to the present invention having the configuration as described above will be described with reference to FIGS. 7 and 8.

8 is a block diagram showing the flow of the refrigerant and water during the heating operation of the water-cooled air conditioner according to the present invention.

First, referring to FIG. 7, when the water-cooled air conditioner examines the refrigerant flow in the cooling mode, the outdoor solenoid valve 234 is opened to guide the refrigerant to flow between the outdoor side 200 and the indoor side 100. It is a state.

Looking at the refrigerant flow in the outdoor side 200, the gas refrigerant flowing from the indoor side 100 passes through the four-way valve 240 through the four-way three outlet port 248 to the four-way two. The accumulator 270 enters through the outlet port 246.

In this case, the temperature of the refrigerant flowing into the accumulator 270 is continuously detected by the suction pipe temperature sensor 272, and when the temperature of the refrigerant detected by the suction pipe temperature sensor 272 is equal to or higher than a set temperature. The injection shield valve 340 is opened by sending an electrical signal to the printed circuit board (not shown).

When the injection blocking valve 340 is opened, a portion of the refrigerant that is heat-exchanged with water in the second heat exchanger 290 flows upward along the capillary tube 360, and the temperature is lowered. Further flowing upward along the liquid refrigerant injection pipe 320 is injected to the inlet side of the accumulator 270 to cool the refrigerant flowing into the accumulator 270.

In the above process, the compressor 210, which can be stopped and broken when a high temperature refrigerant is introduced, can be operated normally.

Meanwhile, the gaseous refrigerant in which the liquid refrigerant is filtered in the accumulator 270 is introduced into the compressor 210.

The refrigerant compressed by the compressor 210 is discharged to the outside of the compressor 210 and passes through the oil separator 218. In the oil separator 218, oil contained in the refrigerant is separated and recovered to the compressor 210 through the oil recovery pipe 219.

That is, as the refrigerant is compressed in the compressor 210, oil is mixed in the refrigerant. Since the oil is in the liquid state and the refrigerant is in the gas state, the oil is separated from the oil separator 218 which is a gas / liquid separator.

On the other hand, the oil inside the compressor 210 on both sides is balanced by the oil equalizing pipe 216 connecting the constant speed compressor 212 and the inverter compressor 214.

The refrigerant passing through the oil separator 218 flows into the four-way valve 240 through the four inlet port 242 and passes through the second one-way outlet port 244. And flows to 290.

At this time, the refrigerant flowing into the second heat exchanger 290 is introduced into the second heat exchanger 290 through the refrigerant inlet pipe 294, and the second heat exchange from the cooling tower C through the inlet pipe 292. The water is cooled through heat exchange with the water introduced into the vessel 290 to be a liquid refrigerant. The refrigerant passing through the second heat exchanger 290 is further cooled while passing through the subcooler 260.

At the same time, the water warmed during the heat exchange with the refrigerant in the second heat exchanger 290 is discharged to the outside of the second heat exchanger 290 through the water outlet pipe 293 and then through the water outlet passage 202 ″. It is introduced into the cooling tower (C).

After the water flowing into the cooling tower C is cooled, the water flows back into the second heat exchanger 290 through the water inlet 202 ′.

On the other hand, the refrigerant passing through the subcooler 260 passes through a dryer (not shown) to remove the moisture contained in the refrigerant, and then flows into the interior side 100 through the common liquid pipe 132, expansion valve After the pressure is reduced by the heat exchange in the first heat exchanger (120). At this time, since the first heat exchanger 120 serves as an evaporator, the refrigerant becomes a low pressure gas through heat exchange.

The refrigerant heat-exchanged via the first heat exchanger 120 flows along the common engine 134 and then flows into the accumulator 270 through the four-way valve 240.

In the accumulator 270, the liquid refrigerant that has not been evaporated is filtered out, and only the refrigerant in the gaseous state is selected and supplied to the compressor 210. One cooling cycle is completed through the above process.

On the other hand, when the water-cooled air conditioner is operated in the heating operation in winter, the injection shielding valve 340 is shielded state, so that the flow of the refrigerant is not generated in the capillary tube 360 and the liquid refrigerant injection pipe 320. .

Referring to the arrow shown in Figure 8 looks at the flow of the refrigerant and water when the water-cooled air conditioner is operating in the heating mode.

The refrigerant compressed from the compressor 210 flows along the common engine 134 and flows into the indoor side 100, and the refrigerant introduced into the indoor side 100 passes through the inside of the first heat exchanger 120. Heat exchange with outdoor air.

The refrigerant heat-exchanged with the first heat exchanger 120 is introduced into the outdoor side 200 through the outdoor liquid pipe 262, and then heat exchanged with water while passing through the second heat exchanger 290.

The heat exchanged refrigerant passes through the four-way outlet port 244 and the four-way outlet port 246 in order to complete the heating cycle while passing through the accumulator 270.
The second heat exchanger 290 may also be referred to as an outdoor heat exchanger.

The scope of the present invention is not limited to the above-described embodiments, and many other modifications based on the present invention will be possible to those skilled in the art within the scope of the present invention.

In the water-cooled air conditioner according to the present invention as described above in detail, liquid refrigerant injection means for guiding the refrigerant through the second heat exchanger to flow into the inlet side of the accumulator is configured.

Therefore, it is possible to lower the temperature of the refrigerant flowing into the accumulator, thereby preventing the overload of the compressor.

In addition, since the overload of the compressor is prevented in advance, an operation stop that may occur when the compressor is overloaded does not occur, thereby improving convenience of use.

In addition, not only the stoppage of the compressor but also the damage is prevented in advance, so that the user is also expected to improve product satisfaction.

Claims (8)

In water-cooled air conditioners, A compressor for compressing the refrigerant, An accumulator for filtering liquid refrigerant from the refrigerant flowing into the compressor; A plate-shaped outdoor heat exchanger configured to heat-exchange the refrigerant compressed by the compressor with water; A suction pipe temperature sensor detecting a temperature of a refrigerant flowing into the accumulator; Liquid refrigerant injection means for guiding a part of the refrigerant heat-exchanged with water in the outdoor heat exchanger to the accumulator, The liquid refrigerant injection means, A liquid refrigerant jet pipe in which both ends communicate with the inlet side of the accumulator and the outlet side of the second heat exchanger to guide the refrigerant flow; It is installed on one side of the liquid refrigerant injection pipe and comprises an injection shielding valve for selectively shielding the liquid refrigerant injection pipe, When the temperature of the refrigerant sensed by the suction pipe temperature sensor is higher than or equal to the set temperature, the injection shielding valve is opened. When the temperature of the refrigerant sensed by the suction pipe temperature sensor is less than the set temperature, the injection shielding valve is closed, The water cooling air conditioner, characterized in that during the heating operation of the water-cooled air conditioner, the injection shielding valve is kept closed. The water-cooled air conditioner of claim 1, wherein the compressor is a high pressure compressor. According to claim 1, wherein the liquid refrigerant injection means, And a capillary tube disposed on one side of the liquid refrigerant injection pipe to lower the temperature and pressure of the refrigerant introduced into the liquid refrigerant injection pipe. delete The water-cooled air conditioner of claim 1, wherein the suction pipe temperature sensor is provided at an inlet side of the accumulator. delete The water-cooled air conditioner of claim 3, wherein the capillary tube is provided at an end portion of the liquid refrigerant injection pipe. 4. The water-cooled air conditioner of claim 3, wherein one end of the capillary tube is connected to an outdoor liquid tube for guiding a refrigerant flow between the second heat exchanger and the indoor side.

Images