KR102076679B1 - A heat exchanger and a natural coolant circulation air conditioner - Google Patents

Abstract

The present invention relates to a heat exchanger and a natural refrigerant circulation air conditioner.
Heat exchanger according to an embodiment of the present invention, a distribution header for distributing the incoming refrigerant; A plurality of tubes connected to side surfaces of the distribution header; And a discharge header communicating with a plurality of the tubes, wherein the distribution header and the discharge header are formed horizontally with the ground.
Natural refrigerant circulating air conditioner according to an embodiment of the present invention, a condenser condensing the refrigerant, a liquid pipe guiding the refrigerant condensed in the condenser, an evaporator evaporating the refrigerant flowing from the liquid pipe, and evaporated from the evaporator An engine for guiding a refrigerant to the condenser, the evaporator comprising: a distribution header for distributing refrigerant flowing from the liquid pipe, a discharge header for discharging refrigerant evaporated from the evaporator to the engine, the distribution header and discharge It includes a plurality of tubes for communicating the header, characterized in that the distribution header and the discharge header is formed horizontally with the ground.
According to an embodiment of the present invention, the pressure loss of the refrigerant may be reduced, and the liquid refrigerant may be evenly distributed inside the heat exchanger. In addition, the coolant flows smoothly along the flow path designed in consideration of the direction of gravity to increase the circulating driving force of the coolant.

Description

A heat exchanger and a natural coolant circulation air conditioner

The present invention relates to a heat exchanger and a natural refrigerant circulation air conditioner.

A heat exchanger is a device that exchanges heat between two fluids, and is a device that transfers heat from a high temperature fluid to a low temperature fluid through a heat transfer wall such as a metal plate.

An air conditioner is a cooling / heating system that cools or heats a room through heat exchange of outdoor / indoor air and refrigerant. The air conditioner may be divided into a forced refrigerant circulating air conditioner that circulates the refrigerant forcibly using a compressor, and a natural refrigerant circulating air conditioner that circulates the refrigerant naturally using a density difference or gravity of the refrigerant. In the case of the natural refrigerant circulation type air conditioner, it is difficult to secure a driving force for circulating the refrigerant compared to the forced refrigerant circulation type air conditioner.

Japanese Patent Application Laid-Open No. 7-151359 discloses a conventional natural refrigerant circulating air conditioner equipped with a pump. Conventional natural refrigerant circulating air conditioners include a pump to supplement the driving force for circulating the refrigerant. In this case, a space for installing the pump is required separately, and there is a problem that power must be supplied to drive the pump.

An object of the present invention is to provide a heat exchanger including a refrigerant passage designed in consideration of a state change of a refrigerant and a direction of gravity.

Another object of the present invention is to provide a natural refrigerant circulating air conditioner that enables a smooth flow of refrigerant without a separate driving source.

A heat exchanger according to an embodiment of the present invention, is formed horizontally on the ground, the distribution header for distributing the refrigerant flowing through the inlet formed at one end; A plurality of first tubes connected to side surfaces of the distribution header and communicating with the distribution header to flow the refrigerant; A redistribution header connected to one end of the first tube connected to the distribution header and the other end of the first tube positioned in a direction opposite to that of the first tube to which refrigerant flowing through the first tube flows; A plurality of second tubes positioned below the first tube and connected to a side surface of the redistribution header, into which refrigerant flowing through the redistribution header flows; And a discharge header positioned below the distribution header and having a plurality of second tubes connected to side surfaces to flow refrigerant flowing through the second tube, and one end of the discharge header to discharge a refrigerant. Formed, the discharge portion is located in the opposite direction of the inlet portion of both ends of the discharge header, the refrigerant flowing through the plurality of first tube flows into the redistribution header, after flowing to the lower side of the redistribution header It is characterized by flowing into the plurality of second tubes.

Natural refrigerant circulating air conditioner according to an embodiment of the present invention, a condenser condensing the refrigerant, a liquid pipe guiding the refrigerant condensed in the condenser, an evaporator evaporating the refrigerant flowing from the liquid pipe, and evaporated from the evaporator An engine for guiding a refrigerant to the condenser, the evaporator comprising: a distribution header for distributing the refrigerant flowing from the liquid pipe; A plurality of first tubes connected to side surfaces of the distribution header and communicating with the distribution header; A redistribution header connected to one end of the first tube connected to the distribution header and the other end of the first tube positioned in a direction opposite to which the refrigerant flowing through the first tube flows; A plurality of second tubes positioned below the first tube and connected to a side surface of the redistribution header, into which refrigerant flowing through the redistribution header flows; And a discharge header located at the lower side of the distribution header, and the plurality of second tubes connected to side surfaces to discharge refrigerant evaporated from the evaporator to the engine, wherein the distribution header and the discharge header are horizontal to the ground. The refrigerant formed from the liquid pipe is distributed in the distribution header to flow the plurality of first tubes, flows into the redistribution header, flows to the lower side of the redistribution header, and then flows into the second tube. Is done.

According to an embodiment of the present invention, the pressure loss of the refrigerant may be reduced, and the liquid refrigerant may be evenly distributed inside the heat exchanger.

In addition, the coolant flows smoothly along the flow path designed in consideration of the direction of gravity to increase the circulating driving force of the coolant.

1 is an installation diagram of a natural refrigerant circulating air conditioner according to an embodiment of the present invention.
2 is a perspective view of a first heat exchanger according to an embodiment of the present invention.
3 is a cross-sectional view taken along line II ′ of FIG. 2.
4 is a perspective view of a second heat exchanger according to an embodiment of the present invention.
5 is a cross-sectional view taken along line II-II 'of FIG. 4.
6 is a perspective view of a natural refrigerant circulating air conditioner according to a first embodiment of the present invention.
7 is a perspective view of a natural refrigerant circulating air conditioner according to a second embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. However, in the detailed description of a preferred embodiment of the present invention, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the same or similar reference numerals are used throughout the drawings for parts having similar functions and functions.

In addition, in the entire specification, when a part is said to be 'connected' to another part, it is not only 'directly connected', but also 'indirectly connected' with other elements in between. Includes. In addition, "including" a component means that other components may be further included instead of excluding other components, unless otherwise stated.

1 is an installation diagram of a natural refrigerant circulating air conditioner according to an embodiment of the present invention.

1, a building 1 comprising a natural refrigerant circulating air conditioner 10, a primary cooling means 20, and a server 30 according to an embodiment of the present invention is disclosed.

The natural refrigerant circulating air conditioner 1 includes a condenser 11, a condensation fan 11a, a liquid tube 12, an evaporator 13, an evaporation fan 13a, and an engine 14 Includes. The refrigerant circulates inside the condenser 11, the liquid tube 12, the evaporator 13, and the engine 14. The condenser 11 and the evaporator 13 may be collectively referred to as a 'heat exchanger'.

The condenser 11 may be provided outside the building 1. In this case, the condenser 11 allows the outdoor air of the building 1 and the refrigerant flowing inside the condenser 11 to exchange heat with each other. However, the condenser 11 is not limited to being installed outdoors of the building 1.

The condensation fan 11a is provided on one side of the condenser 11 and forces the flow of air to pass through the condenser 11. According to the operation of the condensation fan 11a, the air passing through the condenser 11 and the refrigerant flowing through the condenser 11 exchange heat with each other. In other words, the condensation fan 11a can be understood to operate the condenser 11.

The liquid tube 12 communicates the condenser 11 and the evaporator 13. The liquid tube 12 guides the refrigerant that has passed through the condenser 11 to the evaporator 13.

The evaporator 13 may be provided indoors of the building 1. In this case, the evaporator 13 allows the indoor air of the building 1 and the refrigerant flowing inside the evaporator 13 to exchange heat with each other. The evaporator 13 may be installed, for example, on one side of the 'object' that requires temperature control inside the building 1. The object may be, for example, the server 30.

The evaporation fan 13a is provided on one side of the evaporator 13 and forces the flow of air to pass through the evaporator 13. According to the operation of the evaporation fan 13a, the air passing through the evaporator 13 and the refrigerant flowing through the evaporator 13 are exchanged with each other. In other words, the evaporation fan 13a can be understood as operating the evaporator 13.

The engine 14 communicates the evaporator 13 and the condenser 11. The engine 14 guides the refrigerant that has passed through the evaporator 13 to the condenser 11.

The liquid pipe 12 and the engine 14 may be collectively referred to as a 'circulating pipe'.

The main cooling means 20 is an outdoor unit 21 installed outdoors, an indoor unit 22 installed indoors, and a circulation pipe 23 connecting the outdoor unit 21 and the indoor units 22 ).

The outdoor unit 21 may include a compressor 21a and an outdoor heat exchanger 21b. In addition, the indoor unit 22 may include an expansion device 22a, an indoor heat exchanger 22b, and a blower 22c.

The refrigerant circulating through the main cooling means 20 circulates through the compressor 21a, the outdoor heat exchanger 21b, the expansion device 22a, and the indoor heat exchanger 22b, and the outdoor air of the building 1 And heat exchange with outdoor air. And the heat-exchanged air is forcibly flowed by the blower 22c, and controls the temperature of the server 30.

The server 30 is installed inside the building 1. The server 30 needs to be maintained at a constant temperature.

The server 30 may be maintained at a constant temperature according to the air conditioning action of the main cooling device 20. In addition, the natural refrigerant circulating air conditioner 10 may be used as an auxiliary means for reducing power consumption of the main cooling device 20. However, this is only an example, and in some cases, the natural refrigerant circulation air conditioner 10 may be installed and used alone.

Hereinafter, the operation of the natural refrigerant circulating air conditioner 10 will be described.

The refrigerant flowing into the condenser 11 discharges heat to outdoor air passing through the condenser 11 by the condensation fan 11a. The refrigerant deprived of heat by outdoor air condenses and changes into a liquid state. The liquid refrigerant condensed in the condenser 11 flows into the liquid tube 12.

The liquid refrigerant flowing into the liquid tube 12 flows downward under the influence of gravity. Since the evaporator 13 is provided below the condenser 11, liquid refrigerant flows from the condenser 11 to the evaporator 13.

The refrigerant introduced into the evaporator 13 absorbs heat of indoor air passing through the evaporator 13 by the evaporation fan 13a. The refrigerant provided with heat from the indoor air is evaporated and changes into a gas phase. The gaseous refrigerant evaporated from the evaporator 13 flows into the engine 14.

The gaseous refrigerant flowing into the engine 14 flows upward depending on the influence of the density difference. Since the condenser 11 is provided above the evaporator 13, gaseous refrigerant flows from the evaporator 13 to the condenser 11.

By repeating the above process, it is circulated along the circulation pipe, and air in the building 1 can be adjusted.

A heat exchanger is used as the condenser 11 and the evaporator 13. The refrigerant flowing in the condenser 11 flows into a gaseous state and is phase-changed to a liquid state and discharged. Then, it is introduced into a liquid state flowing in the evaporator 13, and is phase-displaced in a gas state and discharged. The density of the gaseous refrigerant is lower than that of air, so if no external force is applied, it tends to rise in the air. In addition, since the density of the liquid refrigerant is higher than that of air, it is easy to flow downward under the influence of gravity in the air. In consideration of the characteristics according to the phase change of the refrigerant, the heat exchanger can be designed as follows.

2 is a perspective view of a first heat exchanger according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line I-I 'of FIG. 2.

2 and 3, the first heat exchanger 100 according to an embodiment of the present invention, the distribution header 110 for distributing the refrigerant flowing from the circulation pipe, and the distribution header 110 is in communication It may include at least one tube 120, at least one fin 130 formed on one side of the tube 120, and a discharge header 150 guiding a refrigerant discharged to the circulation pipe.

The distribution header 110 includes a distribution pipe 112 forming an outer shape, an inlet portion 114 formed at an end portion of the distribution pipe 112, and a agent formed on a side surface of the distribution pipe 112. One connection hole 116 may be included.

The distribution pipe 112 may be a cylindrical tube having a hollow inside. However, the shape of the distribution pipe 112 is not limited to a cylindrical shape. The distribution pipe 112 may be disposed in a horizontal direction with respect to the ground. In other words, the distribution pipe 112 may be arranged in a direction perpendicular to gravity. The distribution pipe 112 may be the same as the diameter of the circulation pipe. The distribution pipe 112 may be formed integrally with the circulation pipe.

The inlet portion 114 may be defined as a portion to which the distribution pipe 112 and the circulation pipe are connected. The inlet portion 114 is a portion that guides the refrigerant from the circulation pipe to the first heat exchanger 100.

The first connection hole 116 may be formed to correspond to the size, shape, and number of the tubes 120. The refrigerant flowing inside the distribution pipe 112 may be guided to the tube 120 through the first connection hole 116. When a plurality of the tubes 120 are provided, the first connection holes 116 may be formed spaced apart at regular intervals in a horizontal direction. In addition, when the tube 120 is arranged in a plurality of layers up and down, the first connection hole 116 may also be arranged in a plurality of layers spaced apart in a vertical direction. The sum of the cross-sectional areas of the first connection hole 116 may correspond to the sum of the cross-sectional areas of the distribution pipe 112.

The tube 120 guides the refrigerant flowing from the distribution pipe 112 to the discharge header 150. The refrigerant passing through the tube 120 may be exchanged with air flowing in a direction transverse to the tube 120. The tube 120 may be disposed long in a horizontal direction with respect to the ground. In other words, the tube 120 may be arranged in a direction perpendicular to the direction of gravity. The tube 120 may be vertically connected to the longitudinal direction of the distribution pipe 112. The tube 120 may be a plurality. The plurality of tubes 120 may be arranged side by side on one plane. In other words, the plurality of tubes 120 may be arranged in one layer.

The tube 120 may include a first tube from an upper side based on FIG. 2 and a second tube provided below the first tube. The first tube may discharge refrigerant from the distribution header 110 and discharge the refrigerant to the second tube. The refrigerant flowing into the second tube may pass through the second tube and be guided to the discharge header 150. In this case, a redistribution header 140 communicating between the first tube and the second tube may be provided between the first tube and the second tube.

The redistribution header 140 is formed on a side surface of the redistribution pipe 142, the redistribution pipe 142, and a second connection hole 144 connected to the first tube and the redistribution pipe 142. It is formed on the side, and may include a third connection hole 146 connected to the second tube.

The redistribution pipe 142 flows in the refrigerant flowing in from the first tube, and discharges the flowed refrigerant into the second tube. The redistribution pipe 142 may have a hollow inside, and may be a semi-circular cross section. However, the shape of the redistribution pipe 142 is not limited to a semicircular pipe. The redistribution pipe 142 may be disposed in a horizontal direction with respect to the ground. In other words, the redistribution pipe 142 may be arranged in a direction perpendicular to gravity. The redistribution pipe 142 may be disposed parallel to the distribution pipe 112. In other words, the distribution pipe 112 and the redistribution pipe 142 are disposed parallel to each other, and the tube 120 may be disposed between the distribution pipe 112 and the redistribution pipe 142. The redistribution pipe 142 may be disposed orthogonal to the tube 120.

The second connection hole 144 may be formed to correspond to the size, shape, and number of the first tube. The refrigerant flowing inside the first tube may be guided to the redistribution pipe 142 through the second connection hole 144. The sum of the cross-sectional areas of the second connection hole 144 may correspond to the sum of the cross-sectional areas of the first tube.

The third connection hole 146 may be formed to correspond to the size, shape, and number of the second tubes. The refrigerant flowing inside the redistribution pipe 142 may be guided to the second tube through the third connection hole 146. The sum of the cross-sectional areas of the third connection hole 146 may correspond to the sum of the cross-sectional areas of the second tube. The third connection hole 146 may be formed under the second connection hole 144. In other words, the refrigerant flowing through the first tube may flow into the redistribution pipe 142 and flow downward, and then be discharged into the second tube.

Meanwhile, the idea of the present invention is not limited to the arrangement of the tube 120 in two layers. The tube 120 may be arranged in three or more layers, and in this case, a plurality of redistribution headers 140 may be provided corresponding to the number of layers of the tube. Detailed description thereof will be omitted.

The pin 130 may be formed of a plate-shaped thermal conductor. The fin 130 may be vertically disposed with the tube 120. The fin 130 may be in contact with the tube 120 to increase the heat transfer efficiency of the tube 120. A tube insertion hole into which the tube 120 can be inserted may be formed in the fin 130. In other words, the tube 120 may be disposed to penetrate the fin 130.

The discharge header 150 includes a discharge pipe 152 forming an outer shape, a discharge portion 154 formed at an end portion of the discharge pipe 152, and a side surface of the discharge pipe 152. 4 may include a connection hole 156.

The discharge pipe 152 may be a cylindrical tube having a hollow inside. However, the shape of the discharge pipe 152 is not limited to a cylindrical shape. The discharge pipe 152 may be disposed in a horizontal direction with respect to the ground. In other words, the discharge pipe 152 may be arranged in a direction perpendicular to gravity. The discharge pipe 152 may be the same as the diameter of the circulation pipe. The discharge pipe 152 may be formed integrally with the circulation pipe. The discharge pipe 152 may be disposed parallel to the distribution pipe 142. When the tube 130 is formed of a plurality of layers, the discharge pipe 152 may be provided below the distribution pipe 142.

The discharge portion 154 may be defined as a portion where the discharge pipe 152 and the circulation pipe are connected. The discharge unit 154 is a portion that guides the refrigerant from the first heat exchanger 100 to the circulation pipe. The discharge part 154 may be provided below the inlet part 114. The discharge part 154 may be formed at both ends of the discharge pipe 152 at an end far from the inlet part 114. In other words, the inlet portion 114 and the discharge portion 154 may be provided in opposite directions to each other. In summary, the inflow side and the discharge side of the first heat exchanger 100 may be formed in opposite directions.

The fourth connection hole 156 may be formed to correspond to the size, shape, and number of the tubes 120. The refrigerant flowing inside the tube 120 may be guided to the discharge pipe 152 through the fourth connection hole 156. When a plurality of the tubes 120 are provided, the fourth connection holes 156 may be formed spaced apart at regular intervals in a horizontal direction. The sum of the cross-sectional areas of the fourth connection hole 156 may correspond to the sum of the cross-sectional areas of the discharge pipe 152.

Hereinafter, the operation of the first heat exchanger 100 will be described.

The refrigerant flowing into the first heat exchanger 100 is once introduced into the distribution header 110 and guided to a first tube connected to the distribution header 110. When the sum of the cross-sectional areas of the first tube is formed to correspond to the cross-sectional area of the distribution header 110, pressure loss of the refrigerant can be prevented. As a result, it is possible to prevent the driving force from weakening due to the pressure loss. Also, at this time, the distribution of the refrigerant is primarily performed. Since the distribution header 110 is disposed in a horizontal direction with respect to the ground, the refrigerant can be evenly distributed. In addition, the refrigerant flowing into the first tube flows into the redistribution pipe 140. The refrigerant flowing into the redistribution pipe 140 is moved downward along the direction of gravity. And it is guided to the second tube. At this time, the redistribution of the refrigerant is secondary. Since the redistribution header 140 is disposed in a horizontal direction with respect to the ground, the refrigerant can be evenly distributed. The refrigerant guided to the second tube is guided to the discharge header 150, and the refrigerant introduced into the discharge header 150 can be discharged to the circulation pipe.

On the other hand, the refrigerant flowing through the distribution header 110, the tube 120 may be introduced into the tube close to the inlet 114 side of the tube. At this time, when the discharge portion 156 is formed in the opposite direction of the inlet portion 114, the refrigerant flowing into the tube close to the inlet portion 114 side is discharged through the entire portion of the discharge header 150 Can be. In this process, the pressure of the tube 120 that is not introduced due to the relatively high concentration of refrigerant is lowered. As a result, since the internal pressure of the distant tube is lowered on the inlet portion 114 side, a lot of refrigerant can be introduced into the tube having a low pressure. In summary, as the inlet portion 114 and the outlet portion 156 are formed in opposite directions, the refrigerant can uniformly flow the plurality of tubes 120.

The operation when using the first heat exchanger 100 as an evaporator will be described in detail. In this case, a refrigerant in a liquid state is introduced into the first heat exchanger 100 along the liquid tube 12, and the refrigerant introduced into the first heat exchanger 100 is phase-changed into a gas state before the engine ( 14).

That is, since the refrigerant flowing into the distribution header 110 is in a liquid state, it is greatly affected by gravity. However, since the distribution header 110, the tube 120, and the redistribution header 140 are disposed horizontally with respect to the ground, it is possible to prevent the liquid from being concentrated due to gravity. That is, even distribution of the refrigerant is possible. In addition, since the redistribution header 140 guides the incoming refrigerant downward along the direction of gravity, it is possible to secure the driving force of the liquid refrigerant.

Particularly, when the tube 130 is formed on a plurality of sides, the distribution header 110 for introducing the liquid refrigerant is disposed above the discharge header 140 to flow inside the first heat exchanger 100. It is possible to increase the driving force of the liquid refrigerant. Conversely, by disposing the discharge header 140 for discharging the gaseous refrigerant under the distribution header 110, the driving force of the gaseous refrigerant discharged through the engine 14 can be increased.

The operation of using the first heat exchanger 100 as a condenser will be described in detail. In this case, the refrigerant in the gaseous state flows into the first heat exchanger 100 along the engine 14, and the refrigerant introduced into the first heat exchanger 100 changes to the liquid state before the liquid pipe ( 13).

That is, the refrigerant phase-changed to the liquid state in the first heat exchanger 100 can be smoothly moved downward along the direction of gravity in the redistribution pipe 140. As a result, it is possible to increase the driving force of the liquid refrigerant.

In the case of the gaseous refrigerant, since the influence on the driving force is smaller than that of the liquid refrigerant, the driving force can be increased both when the first heat exchanger 100 is used as an evaporator and when it is used as a condenser.

4 is a perspective view of a second heat exchanger according to an embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along line II-II 'of FIG. 4.

4 and 5, the second heat exchanger 200 according to an embodiment of the present invention, the distribution header 210 for distributing the refrigerant flowing from the circulation pipe, and the distribution header 210 in communication It may include at least one or more tubes 220, at least one fin 230 formed on one side of the tube 220, and a discharge header 250 for guiding refrigerant discharged to the circulation pipe.

The distribution header 210 includes a distribution pipe 212 forming an outer shape, an inlet portion 214 formed at an end portion of the distribution pipe 212, and a product formed on a side surface of the distribution pipe 212. 5 may include a connection hole 216.

The distribution pipe 212 may be a cylindrical tube having a hollow inside. However, the shape of the distribution pipe 212 is not limited to a cylindrical shape. The distribution pipe 212 may be disposed in a direction perpendicular to the ground. In other words, the distribution pipe 212 may be arranged up and down along the direction of gravity. The distribution pipe 212 may have the same diameter as the circulation pipe. The distribution pipe 212 may be formed integrally with the circulation pipe.

The inlet 214 may be defined as a portion to which the distribution pipe 212 and the circulation pipe are connected. The inlet 214 is a portion that guides the refrigerant from the circulation pipe to the second heat exchanger 200.

The fifth connection hole 216 may be formed to correspond to the size, shape, and number of the tubes 220. The refrigerant flowing inside the distribution pipe 212 may be guided to the tube 220 through the fifth connection hole 216. When a plurality of the tubes 220 are provided, the fifth connection holes 216 may be formed spaced apart at regular intervals in the vertical direction. In addition, when the tube 220 is arranged in a plurality of layers, the fifth connection hole 216 may also be arranged in a plurality of layers spaced apart from side to side. The sum of the cross-sectional areas of the fifth connection hole 216 may correspond to the sum of the cross-sectional areas of the distribution pipe 212.

The tube 220 guides the refrigerant flowing from the distribution pipe 212 to the discharge header 250. The refrigerant passing through the tube 220 may be exchanged with air flowing in a direction transverse to the tube 220. The tube 220 may be arranged long in a direction perpendicular to the ground. In other words, the tube 220 may be disposed horizontally with respect to the direction of gravity. The tube 220 may be vertically connected to the longitudinal direction of the distribution pipe 212.

The tube 220 may be a plurality. The plurality of tubes 220 may be arranged side by side on one plane. In other words, the plurality of tubes 220 may be arranged in one layer. In addition, the plurality of tubes 220 may be arranged in a plurality of layers.

The tube 220 may be referred to as a 'third tube' and a 'fourth tube' from the left based on FIG. 4. The third tube may discharge refrigerant to the fourth tube by introducing refrigerant from the distribution header 210. The refrigerant introduced into the third tube may pass through the fourth tube and be guided to the discharge header 250. In this case, a redistribution header 240 communicating between the third tube and the fourth tube may be provided between the third tube and the fourth tube.

The redistribution header 240 is formed on a side surface of the redistribution pipe 242 and the redistribution pipe 242, and a sixth connection hole 244 connected to the third tube and the redistribution pipe 242. It is formed on the side, and may include a seventh connection hole 246 connected to the fourth tube.

The redistribution pipe 242 flows in the refrigerant flowing in from the third tube, and discharges the flowed refrigerant into the fourth tube. The redistribution pipe 242 may be a tube having a hollow inside and a semi-circular cross section. However, the shape of the redistribution pipe 242 is not limited to a semicircular pipe. The redistribution pipe 242 may be disposed in a direction perpendicular to the ground. In other words, the redistribution pipe 212 may be arranged up and down along the direction of gravity. The redistribution pipe 242 may be disposed parallel to the distribution pipe 214. In other words, the distribution pipe 214 and the redistribution pipe 242 are disposed parallel to each other, and the tube 220 may be disposed between the distribution pipe 214 and the redistribution pipe 242. The redistribution pipe 242 may be disposed orthogonal to the tube 220.

The sixth connection hole 244 may be formed to correspond to the size, shape, and number of the third tube. The refrigerant flowing inside the third tube may be guided to the redistribution pipe 242 through the sixth connection hole 244. The sum of the cross-sectional areas of the sixth connection hole 244 may correspond to the sum of the cross-sectional areas of the third tube.

The seventh connection hole 246 may be formed to correspond to the size, shape, and number of the seventh layer tube. The refrigerant flowing inside the redistribution pipe 242 may be guided to the fourth tube through the seventh connection hole 246. The sum of the cross-sectional areas of the seventh connection hole 246 may correspond to the sum of the cross-sectional areas of the fourth tube.

Meanwhile, the idea of the present invention is not limited to the arrangement of the tube 220 in two layers. The tube 220 may be arranged in three or more layers, and in this case, a plurality of redistribution headers 240 may be provided corresponding to the number of layers of the tube. Detailed description thereof will be omitted.

The fin 230 may be formed of a plate-shaped thermal conductor. The fin 230 may be vertically disposed with the tube 220. The fin 230 may be in contact with the tube 220 to increase the heat transfer efficiency of the tube 220. A tube insertion hole into which the tube 220 can be inserted may be formed in the fin 230. In other words, the tube 220 may be disposed to penetrate the fin 230.

The discharge header 250 includes a discharge pipe 252 forming an outer shape, a discharge portion 254 formed at an end portion of the discharge pipe 252, and a discharge agent formed on a side surface of the discharge pipe 252. 8 connection hole 256 may be included.

The discharge pipe 252 may be a cylindrical tube having a hollow inside. However, the shape of the discharge pipe 252 is not limited to a cylindrical shape. The discharge pipe 252 may be disposed in a direction perpendicular to the ground. In other words, the discharge pipe 252 may be arranged in the vertical direction along the direction of gravity. The discharge pipe 252 may be the same as the diameter of the circulation pipe. The discharge pipe 252 may be formed integrally with the circulation pipe. The discharge pipe 252 may be disposed parallel to the distribution pipe 242. When the tube 230 is formed of a plurality of layers, the discharge pipe 252 may be provided on one side of the distribution pipe 242.

The discharge portion 254 may be defined as a portion to which the discharge pipe 252 and the circulation pipe are connected. The discharge portion 254 is a portion that guides the refrigerant from the second heat exchanger 200 to the circulation pipe. The discharge part 254 may be provided below the inflow part 214. The discharge part 254 may be formed at both ends of the discharge pipe 252 at an end far from the inlet part 214. In other words, the inlet part 214 and the discharge part 254 may be provided in opposite directions to each other. In summary, the inflow side and the discharge side of the second heat exchanger 200 may be formed in opposite directions.

The eighth connection hole 256 may be formed to correspond to the size, shape, and number of the tubes 220. The refrigerant flowing inside the tube 220 may be guided to the discharge pipe 252 through the eighth connection hole 256. When a plurality of the tubes 220 are provided, the eighth connection holes 256 may be formed spaced apart at regular intervals in a horizontal direction. The sum of the cross-sectional areas of the eighth connection hole 256 may correspond to the sum of the cross-sectional areas of the discharge pipe 252.

Hereinafter, the operation of the second heat exchanger 200 will be described.

The refrigerant flowing into the second heat exchanger 200 is once introduced into the distribution header 210 and guided to a third tube connected to the distribution header 210. When the sum of the cross-sectional areas of the third tube is formed to correspond to the cross-sectional area of the distribution header 210, pressure loss of the refrigerant can be prevented. As a result, it is possible to prevent the driving force from weakening due to the pressure loss. The refrigerant flowing into the first tube flows into the redistribution pipe 240. The refrigerant flowing into the redistribution pipe 240 is guided to the fourth tube. At this time, the redistribution of the refrigerant is secondary. The refrigerant guided to the fourth tube is guided to the discharge header 250, and the refrigerant introduced into the discharge header 250 can be discharged to the circulation pipe.

The operation of using the second heat exchanger 200 as a condenser will be described in detail.

The gaseous refrigerant is introduced into the second heat exchanger 200, and the introduced refrigerant is phase-changed to a sieve state and then discharged from the second heat exchanger 200.

That is, since the refrigerant flowing into the second heat exchanger 200 is in a gas state, it is not greatly affected by gravity. However, the refrigerant in the liquid state that has passed through the second heat exchanger 200 is greatly affected by gravity. The refrigerant phase-changed in the liquid phase in the second heat exchanger 200 may flow smoothly along the discharge header 252 disposed vertically along the direction of gravity. As a result, it is possible to increase the driving force of the refrigerant flowing in the circulation pipe.

When the second heat exchanger 200 is used as a condenser, the distribution header 210 may be referred to as a 'condenser distribution header'. In addition, the redistribution header 240 and the ejection header 250 may be referred to as a 'condenser redistribution header' and a 'condenser ejection header', respectively.

6 is a perspective view of a natural refrigerant circulating air conditioner according to a first embodiment of the present invention. Hereinafter, overlapping descriptions will be omitted.

Referring to Figure 6, the natural refrigerant circulation air conditioner 10 according to the first embodiment of the present invention, the condenser 11, the liquid tube 12, the evaporator 13, the engine 14 It includes.

The condenser 11 is provided on the upper side of the evaporator 13, the inlet side of the condenser 11 is connected to the engine 14, the discharge side of the condenser 11 is connected to the liquid tube 12 . As the condenser 11, the second heat exchanger 200 may be used.

The evaporator 13 is provided on the lower side of the condenser 11, the inlet side of the evaporator 13 is connected to the liquid tube 12, and the discharge side of the evaporator 13 is connected to the engine 14 . As the evaporator 13, the first heat exchanger 100 may be used.

Looking at the operation of the natural refrigerant circulating air conditioner 10 according to the first embodiment, the liquid refrigerant condensed in the condenser 11 is located in the direction of gravity along the liquid tube 12, the evaporator 13 ). The gaseous refrigerant evaporated from the evaporator 13 may flow upward along the engine 14 and flow back into the condenser 11 to be circulated.

7 is a perspective view of a natural refrigerant circulating air conditioner according to a second embodiment of the present invention. Hereinafter, overlapping descriptions will be omitted.

Referring to FIG. 7, a natural refrigerant circulating air conditioner 10 according to a second embodiment of the present invention includes the condenser 11, a liquid tube 12, an evaporator 13, and an engine 14 Including, as the condenser 11 and the evaporator 13, the first heat exchanger 100 may be used.

The operation of the natural refrigerant circulating air conditioner 10 according to the second embodiment is similar to the operation of the natural refrigerant circulating air conditioner 10 according to the first embodiment.

According to an embodiment of the present invention, the pressure loss of the refrigerant may be reduced, and the liquid refrigerant may be evenly distributed inside the heat exchanger. In addition, the coolant flows smoothly along the flow path designed in consideration of the direction of gravity to increase the circulating driving force of the coolant.

In the above, the present invention has been mainly described for its preferred embodiment, but this is merely an example and does not limit the present invention, and a person having ordinary knowledge in the field to which the present invention belongs does not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications not illustrated above are possible. For example, each component specifically shown in the embodiments of the present invention can be implemented by modification. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

Claims (13)

A distribution header formed horizontally on the ground and distributing the refrigerant flowing through the inlet formed at one end;
A plurality of first tubes connected to side surfaces of the distribution header and communicating with the distribution header to flow the refrigerant;
A redistribution header connected to one end of the plurality of first tubes connected to the distribution header and the other ends of the plurality of first tubes positioned to flow in the refrigerant flowing through the first tube;
A plurality of second tubes positioned below the first tube and connected to a side surface of the redistribution header, into which refrigerant flowing through the redistribution header flows; And
Located on the lower side of the distribution header, the plurality of second tube is connected to the side includes a discharge header through which the refrigerant flowing through the second tube flows,
A discharge portion for discharging the refrigerant is formed at one end of the discharge header,
The discharge portion, located at opposite ends of the inlet portion of both ends of the discharge header,
The refrigerant flowing through the plurality of first tubes flows into the redistribution header, flows to the lower side of the redistribution header, and then flows into the plurality of second tubes to be redistributed. delete According to claim 1,
The first tube and the second tube are heat exchangers formed horizontally with the ground. delete According to claim 1,
The redistribution header is a heat exchanger formed parallel to the ground. The method of claim 5,
The redistribution header,
Redistribution piping having a hollow inside;
A second connection hole formed on a side surface of the redistribution pipe and connected to the first tube; And
A heat exchanger including; formed on the lower side of the second connection hole, a third connection hole connected to the second tube. According to claim 1,
The distribution header includes a distribution pipe having a hollow therein, and a first connection hole to which the first tube is connected,
The discharge header, a heat exchanger including a discharge pipe having a hollow therein, and a fourth connection hole to which the second tube is connected. The method of claim 7,
A plurality of the first connection hole is provided,
The plurality of first connection holes are spaced apart in the horizontal direction,
The sum of the cross-sectional areas of the plurality of first connection holes corresponds to the sum of the cross-sectional areas of the distribution pipe. A condenser condensing the refrigerant, a liquid pipe guiding the refrigerant condensed in the condenser, an evaporator evaporating the refrigerant flowing from the liquid pipe, and an engine guiding the refrigerant evaporated from the evaporator to the condenser,
The evaporator,
A distribution header for distributing the refrigerant introduced from the liquid pipe;
A plurality of first tubes connected to side surfaces of the distribution header and communicating with the distribution header;
A redistribution header connected to one end of the first tube connected to the distribution header and the other end of the first tube positioned in a direction opposite to which the refrigerant flowing through the first tube flows;
A plurality of second tubes positioned below the first tube and connected to a side surface of the redistribution header, into which refrigerant flowing through the redistribution header flows; And
Located on the lower side of the distribution header, the plurality of second tubes connected to the side includes a discharge header for discharging the refrigerant evaporated from the evaporator to the engine,
The distribution header and the discharge header are formed horizontally with the ground,
The refrigerant introduced from the liquid pipe is distributed in the distribution header to flow the plurality of first tubes, flows into the redistribution header, flows to the lower side of the redistribution header, and then flows into the plurality of second tubes to be redistributed. Natural refrigerant circulating air conditioner. delete The method of claim 9,
Natural refrigerant circulating air that is formed at one end of the distribution header and includes an inlet for introducing refrigerant, and an outlet for forming a refrigerant at one end of the discharge header, and the inlet and outlet are disposed in opposite directions to each other. Harmony. The method of claim 9,
The condenser includes a condenser distribution header for distributing refrigerant flowing from the engine, a condenser discharge header for discharging refrigerant condensed from the condenser to the liquid pipe, and a plurality of condenser tubes communicating with the condenser distribution header and the condenser discharge header Natural refrigerant circulating air conditioner comprising a. The method of claim 12,
The condenser distribution header and the condenser discharge header are natural refrigerant circulation air conditioners arranged in a vertical direction with respect to the ground.

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