JP2011102651A - Heat exchanger and air conditioner loading the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent narrowing of an effective space in a device loading a heat exchanger due to a receiver tank, in a side flow-system parallel flow type heat exchanger. <P>SOLUTION: This heat exchanger 1 includes two vertical header pipes 2, 3 disposed in parallel with each other at an interval, and a plurality of horizontal flat tubes 4 disposed between the header pipes 2, 3 in a state that refrigerant passages 5 formed therein are communicated with the inside of the header pipes 2, 3. The heat exchanger 1 is bent so that its planar figure is L-shaped, and refrigerant inlet/outlet ports 7, 8 are projected from the header pipe 3 forming a long-side end of the L-shape. The header pipe 2 forming a short-side end of the L-shape is connected with the receiver tank 20 through refrigerant inlet/outlet pipes 21, 22 at a position where a supercooling area follows thereafter, when the heat exchanger 1 is used as a condenser. The receiver tank 20 is disposed at a windward side of a bent corner section 1a of the heat exchanger 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a side flow parallel flow heat exchanger and an air conditioner equipped with the heat exchanger.

  A parallel flow type in which a plurality of flat tubes are arranged between two header pipes, and a plurality of refrigerant passages in the flat tubes communicate with the inside of the header pipe, and fins such as corrugated fins are arranged between the flat tubes. Heat exchangers are widely used in car air conditioners and building air conditioners. Examples of this type of heat exchanger can be found in US Pat.

  In a parallel flow type heat exchanger, a receiver tank may be connected to one of the two header pipes. The receiver tank serves as a buffer that adjusts the amount of refrigerant in the heat exchanger, performs gas-liquid separation of the refrigerant, and removes moisture and foreign substances in the refrigerant with filter means inserted therein. It is provided for the purpose. Examples of parallel flow heat exchangers having a receiver tank can be seen in Patent Documents 3-6.

  In the parallel flow type heat exchanger, a plurality of flat tubes are divided into several groups, and after flowing the refrigerant from the first header pipe to the second header pipe through the first group of flat tubes, the flat flow of the second group is obtained. Follow the zigzag path, such as returning the refrigerant from the second header pipe to the first header pipe through the tube, and again flowing the refrigerant from the first header pipe to the second header pipe through the third group of flat tubes. It is often done to flow the refrigerant in the form. The number of times the refrigerant changes the flow direction between the first header pipe and the second header pipe is referred to as “number of turns” as described in Patent Document 2.

JP 63-34466 A JP-A-6-213534 JP 11-270927 A JP 2001-336863 A JP 2003-42601 A JP 2009-162468 A

  In the present invention, when a receiver tank is provided in a so-called side flow parallel flow heat exchanger in which a refrigerant flows through a horizontal flat tube, an effective space in a device in which the heat exchanger is mounted is narrowed by the receiver tank. On the other hand, an object of the present invention is to ensure that the performance of the heat exchanger is sufficiently extracted by the presence of the receiver tank.

  In order to achieve the above object, the present invention provides two header pipes arranged in parallel at a distance from each other, and a plurality of refrigerant pipes arranged between the two header pipes and provided inside the header pipe. A side flow type parallel flow type heat exchanger having a flat tube bent into an L shape and condensing the heat exchanger on one side of the header pipe. When used as a heat exchanger, a receiver tank is connected to a location followed by a supercooling region, and the receiver tank is arranged on the windward side of the bending corner portion of the heat exchanger.

  According to this configuration, the receiver tank is arranged at a location that was a dead space when the heat exchanger is mounted on the equipment casing, that is, the windward side of the bent corner portion of the L-shaped parallel flow heat exchanger. Therefore, the provision of the receiver tank does not require an extra space, and the effective space in the device on which the heat exchanger is mounted cannot be reduced. Moreover, since the connection location of the receiver tank with respect to the header pipe is set to a location where the supercooling region will follow when the heat exchanger is used as a condenser, the refrigerant is surely brought into a supercooled state. be able to.

  In the heat exchanger having the above-described configuration, a refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank and a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank are both connected to the header pipe forming the end of the L-shaped short side. It is preferable.

  According to this configuration, the pipe from the header pipe to the receiver tank can be short.

  In the heat exchanger configured as described above, a refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank is connected to a header pipe having an end of the L-shaped short side, while a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank is the L It is preferable to be connected to a header pipe that forms the end of the long side of the character shape.

  In the heat exchanger having the above-described configuration, a refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank is connected to a header pipe that forms an end of the long side of the L-shape, while a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank is the L It is preferable to be connected to a header pipe that forms the end of the short side of the character shape.

  In the heat exchanger having the above-described configuration, a refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank and a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank are both connected to the header pipe forming the end of the L-shaped short side. In addition, it is preferable that a refrigerant inlet / outlet pipe serving as a refrigerant outlet when the heat exchanger is used as a condenser is connected to the header pipe.

  In the heat exchanger configured as described above, it is preferable that the receiver tank is disposed in an upwind flow path of an air flow that passes through the heat exchanger.

  According to this configuration, heat exchange between the receiver tank and the external air is promoted, and the heat exchange capability of the heat exchanger can be further enhanced.

  In the heat exchanger configured as described above, the capacity of the receiver tank is equal to or greater than the total refrigerant liquid amount in the refrigeration cycle including the heat exchanger minus the capacity of the heat exchanger and the capacity of the high-pressure side refrigerant pipe. It is preferable that it is set to.

  According to this configuration, when performing a pump-down operation in which the refrigerant is concentrated on the heat exchanger side, the refrigerant can be received without difficulty and an abnormal high pressure does not occur.

  In the heat exchanger having the above-described configuration, it is preferable that the supercooling region of the heat exchanger is set to an area that is equal to or larger than an area that can ensure the degree of supercooling required at the rated capacity.

  According to this configuration, the capacity of the heat exchanger can be reliably exhibited at the rated capacity.

  In addition, the present invention is an air conditioner in which the heat exchanger configured as described above is mounted on an outdoor unit.

  According to this configuration, the receiver tank provided in the heat exchanger does not narrow the effective space in the outdoor unit, and an air conditioner in which the heat exchanger exhibits sufficient capacity can be provided.

  According to the present invention, since the effective space in the device on which the heat exchanger is mounted is not narrowed by the arrangement of the receiver tank, the housing of the device does not need to be increased unnecessarily. Moreover, the performance required for the heat exchanger can be reliably extracted by utilizing the receiver tank.

It is a typical front view of the heat exchanger which concerns on 1st Embodiment of this invention. It is a typical horizontal sectional view of the outdoor unit of the air conditioner carrying the heat exchanger of FIG. It is a perspective view of the heat exchanger of a 1st embodiment. It is a top view of the heat exchanger of a 1st embodiment. It is a typical front view of the heat exchanger which concerns on 2nd Embodiment of this invention. It is a perspective view of the heat exchanger of 2nd Embodiment. It is a top view of the heat exchanger of 2nd Embodiment. It is a typical front view of the heat exchanger which concerns on 3rd Embodiment of this invention. It is a perspective view of the heat exchanger of 3rd Embodiment. It is a top view of the heat exchanger of 3rd Embodiment. It is a typical front view of the heat exchanger which concerns on 4th Embodiment of this invention. It is a typical front view of the heat exchanger which concerns on 5th Embodiment of this invention. It is a typical front view of the heat exchanger which concerns on 6th Embodiment of this invention. It is a typical front view of the heat exchanger which concerns on 7th Embodiment of this invention. It is a typical front view of the heat exchanger which concerns on 8th Embodiment of this invention. It is a typical vertical sectional view explaining the structural example of the parallel flow type heat exchanger of a side flow system.

  A structural example of a parallel flow type heat exchanger that forms the basis of the embodiment of the present invention will be described with reference to FIG. In FIG. 16, the upper side of the paper is the upper side in the vertical direction, and the lower side of the paper is the lower side in the vertical direction. Further, the left side of the paper is the left side in the left-right direction, and the right side of the paper is the right side in the left-right direction.

  The heat exchanger 1 is used in a side flow system, and two vertical header pipes 2 and 3 are arranged in parallel at intervals in the horizontal direction, and a plurality of horizontal header pipes 2 and 3 are arranged between the header pipes 2 and 3. The flat tubes 4 are arranged at a predetermined pitch in the vertical direction. The flat tube 4 is an elongated molded product obtained by extruding a metal, and a refrigerant passage 5 through which a refrigerant flows is formed. Since the flat tube 4 is disposed so that the extrusion direction, which is the longitudinal direction, is horizontal, the refrigerant flow direction of the refrigerant passage 5 is also horizontal. A plurality of refrigerant passages 5 having the same cross-sectional shape and the same cross-sectional area are arranged in the depth direction of FIG. 16, and therefore the vertical cross section of the flat tube 4 has a harmonica shape. Each refrigerant passage 5 communicates with the inside of the header pipes 2 and 3. Corrugated fins 6 are arranged between the adjacent flat tubes 4.

  Outer flat corrugated fins 6a are arranged on the flat surfaces facing the outer side of the flat tubes 4 located on the outermost side among the flat tubes 4 in which a plurality of tubes are arranged in parallel. A side plate 10 is disposed outside the outermost corrugated fin 6a.

  The header pipes 2 and 3, the flat tube 4, the corrugated fin 6, the outermost corrugated fin 6 a, and the side plate 10 are all made of a metal having good heat conductivity such as aluminum, and the flat tube 4 is The corrugated fin 6 and the outermost corrugated fin 6a are fixed to the flat tube 4 and the side plate 10 is fixed to the outermost corrugated fin 6a by brazing or welding.

  The refrigerant outlets 7 and 8 are provided only on the header pipe 3 side. That is, the header pipe 3 is a header pipe on the refrigerant pipe connection side, and the header pipe 2 is a header pipe on the refrigerant pipe non-connection side. The refrigerant inlet / outlet 7 protrudes from the vicinity of the upper end of the header pipe 3, and the refrigerant inlet / outlet 8 protrudes from the vicinity of the lower end of the header pipe 3 so as to be parallel to each other and perpendicular to the axis of the header pipe 3. The refrigerant outlets 7 and 8 are fixed to the header pipe 3 by brazing or welding.

  Two partition plates 9a and 9c are provided in the header pipe 3 at intervals in the vertical direction. Inside the header pipe 2, the partition plates are located at a height intermediate between the partition plates 9a and 9c. 9b is provided.

  When the heat exchanger 1 is used as a condenser, the refrigerant flows in from the upper refrigerant inlet / outlet port 7 as indicated by solid line arrows in FIG. The refrigerant entering from the refrigerant inlet / outlet 7 is blocked by the partition plate 9 a and travels toward the header pipe 2 via the flat tube 4. This refrigerant flow is represented by a left-pointing block arrow. The refrigerant that has entered the header pipe 2 is blocked by the partition plate 9 b and travels to the header pipe 3 via another flat tube 4. This is the first turn, and the refrigerant flow after the turn is represented by a block arrow pointing to the right. The refrigerant that has entered the header pipe 3 is dammed up by the partition plate 9 c, and further travels toward the header pipe 2 via another flat tube 4. This is the second turn, and the flow of the refrigerant after the turn is represented by a left-pointing block arrow. The refrigerant that has entered the header pipe 2 is folded back and travels again to the header pipe 3 via another flat tube 4. This is the third turn, and the refrigerant flow after the turn is represented by a block arrow pointing to the right. The refrigerant finally flows out from the refrigerant inlet / outlet 8.

  Thus, the refrigerant follows the zigzag path while repeating the turn and flows from the top to the bottom. Here, the case where the number of partition plates is three is shown, but this is only an example, and the number of partition plates and the number of times of the resulting turn can be set as desired.

  In the configuration of FIG. 16, a plurality of flat tubes 4 positioned in the height region above the partition plate 9a constitute a single flow path, and are positioned in the height region between the partition plate 9a and the partition plate 9b. A plurality of flat tubes 4 constitute another flow path, and a plurality of flat tubes 4 positioned in the height region between the partition plate 9b and the partition plate 9c constitute another flow path, A plurality of flat tubes 4 positioned in a height region between the lower side of the plate 9c constitutes another collected flow path. These collected flow paths will be referred to as a first flow path 11, a second flow path 12, a third flow path 13, and a fourth flow path 14 in the order described. In FIG. 16, the code | symbol which shows another of a flow path is put in the block arrow.

  When the heat exchanger 1 is used as an evaporator, the refrigerant flow is reversed. That is, the refrigerant enters the header pipe 3 from the refrigerant inlet / outlet 8 as shown by a dotted arrow in FIG. 16, is dammed by the partition plate 9c and goes to the header pipe 2 via the fourth flow path 14, and in the header pipe 2, the partition plate 9b It is dammed and headed to the header pipe 3 via the third flow path 13, and the header pipe 3 is dammed by the partition plate 9 a, is directed to the header pipe 2 again via the second flow path 12, and is turned back by the header pipe 2 to be the first flow. It goes to the header pipe 3 again via the path 11, and flows out from the refrigerant inlet / outlet port 7 as indicated by a dotted line arrow.

  In 1st Embodiment of this invention, the receiver tank 20 is arrange | positioned in the form shown in FIG. 1 at the heat exchanger 1 of the above structures. In the heat exchanger 1 of FIG. 1, when the vertical widths of the first to fourth flow paths are compared, the first flow path 11 is the widest, the second flow path 12 is the next, and the third flow The channel 13 is designed to be narrower, the fourth channel 14 is further narrowed, and so on. Needless to say, a wide flow path includes a large number of flat tubes 4, and a narrow flow path includes a small number of flat tubes 4.

  The receiver tank 20 is connected to the header pipe 2 that is the header pipe not connected to the refrigerant pipe. The receiver tank 20 is connected to the header pipe 2 by a pair of refrigerant inlet / outlet pipes 21 and 22 arranged at intervals in the vertical direction. The receiver tank 20 and the refrigerant inlet / outlet pipes 21 and 22 are made of the same material as the header pipe 2, and the refrigerant inlet / outlet pipes 21 and 22 are fixed to the receiver tank 20 and the header pipe 3 by brazing or welding.

  The refrigerant inlet / outlet pipe 21 faces the third flow path 13, and the refrigerant inlet / outlet pipe 22 faces the fourth path 14. When the heat exchanger 1 is used as a condenser, the first flow path 11, the second flow path 12, and the third flow path 13 exist before the refrigerant inlet / outlet pipe 21. That is, the flow path counts two turns in front of the refrigerant inlet / outlet pipe 21.

  Inside the header pipe 2, a partition plate 9 d is provided between the connection points of the refrigerant inlet / outlet pipes 21 and 22. The partition plate 9d partitions the third flow path 13 and the fourth flow path 14 in the same manner as the partition plate 9c.

  The heat exchanger 1 is bent so that the planar shape is L-shaped. The header pipe 3 on the refrigerant pipe connection side has an L-shaped long side end, and the header pipe 2 on the refrigerant pipe non-connection side has an L-shaped short side end. A bending corner portion 1a, which is a corner bent in an L shape, is a rounded portion having a predetermined curvature, and a receiver tank 20 is disposed on the windward side of the bending corner portion 1a (see FIGS. 2 to 4).

  When the heat exchanger 1 is used as a condenser, a gaseous, that is, overheated refrigerant flows into the header pipe 3 from the refrigerant inlet / outlet 7. The superheated refrigerant passes through the first flow path 11 from right to left and enters the header pipe 2, where it turns and enters the second flow path 12. The refrigerant passes through the second flow path 12 from the left to the right and returns to the header pipe 3. During this reciprocation, the overheated refrigerant dissipates heat and liquefaction proceeds.

  The refrigerant inlet / outlet pipe 21 that is a fixing member of the receiver tank 20 appears after the turn from the second flow path 12 to the third flow path 13 is finished, and the heat of the overheated refrigerant is transmitted to the receiver tank 20. Absent. Therefore, useless heat is not given to the refrigerant in the receiver tank 20 that is about to flow out to the supercooling region.

  In order to reinforce the fixing of the receiver tank 20 by the refrigerant inlet / outlet pipes 21 and 22, a fixing member such as a stay or a bracket may be added. It is desirable to suppress heat conduction to the receiver tank 20 by setting it at a location one turn or more away from the refrigerant inflow side when used as a receiver.

  The refrigerant returned to the header pipe 3 from the second flow path 12 turns there and enters the third flow path 13, passes through the third flow path 13 from the right to the left, and enters the header pipe 2. The refrigerant that has entered the header pipe 2 from the third flow path 13 is blocked by the partition plate 9 d and enters the receiver tank 20. The receiver tank 20 functions as buffer means for adjusting the amount of refrigerant in the heat exchanger 1 and gas-liquid separation means for refrigerant.

  The capacity of the receiver tank 20 (the volume of the internal space in which the refrigerant can be received. The other components are used in the same meaning) is the total amount of refrigerant liquid in the refrigeration cycle including the heat exchanger 1 (the estimated maximum enclosed amount). The capacity of the heat exchanger 1 and the capacity of the high-pressure side refrigerant pipe (pipe for sending high-pressure refrigerant discharged from the compressor described later to the heat exchanger 1) Set more than what you subtracted. This is important for the pump down operation described later.

  The refrigerant that has entered the header pipe 2 from the third flow path 13 once enters the receiver tank 20 and then enters the fourth flow path 14. The fourth flow path 14 is a supercooling region. The refrigerant passes through the fourth flow path 14 from the left to the right, returns to the header pipe 3, and flows out from the refrigerant inlet / outlet 8. Heat exchange proceeds and condenses while passing through the fourth flow path 14, and the refrigerant becomes supercooled.

  The area of the supercooling region including the third flow path 13 and the fourth flow path 14 can ensure the required degree of supercooling at the time of the rated capacity, that is, when performing the operation that exhibits the capacity set as the rating. Set to an area greater than or equal to the area.

  If the area of the supercooling region including the third flow path 13 and the fourth flow path 14 is set to an area that is less than the area that can ensure the required degree of supercooling, the receiver tank 20 is a liquid refrigerant. If the refrigerant is not added until the liquid is full, a further degree of supercooling cannot be secured, and the refrigerant is consumed wastefully.

  As shown in FIG. 2, the heat exchanger 1 can be mounted on an outdoor unit of a separate type air conditioner using a heat pump cycle. The outdoor unit 30 shown in FIG. 2 includes a sheet metal housing 30a having a substantially rectangular planar shape. The long side of the housing 30a is a front surface 30F and a back surface 30B, and the short side is a left side surface 30L and a right side surface 30R. An exhaust port 31 is formed on the front surface 30F, a rear intake port 32 is formed on the rear surface 30B, and a side intake port 33 is formed on the left side surface 30L. The exhaust port 31 is composed of a set of a plurality of horizontal slit-shaped openings, and the rear intake port 32 and the side intake port 33 are composed of lattice-shaped openings. A top plate and a bottom plate (not shown) are added to the four sheet metal members of the front surface 30F, the back surface 30B, the left side surface 30L, and the right side surface 30R to form a hexahedral housing 30a.

  Inside the housing 30a, a planar L-shaped heat exchanger 1 is disposed immediately inside the rear intake port 32 and the side intake port 33. In order to force heat exchange between the heat exchanger 1 and the external air, a blower 34 is disposed between the heat exchanger 1 and the exhaust port 31. The blower 34 is a combination of an electric motor 34a and a propeller fan 34b.

  In order to improve the blowing efficiency, a bell mouth 35 surrounding the propeller fan 34b is attached to the inner surface of the front surface 30F of the housing 30a. The space inside the right side surface 30R of the housing 30a is separated from the air flow flowing from the rear intake port 32 to the exhaust port 31 by the partition wall 36, and the compressor 37 is accommodated therein.

  The receiver tank 20 is disposed in a gap between the bending corner portion 1a of the heat exchanger 1 and the corner portion of the housing 30a. The rear intake port 32 and the side intake port 33 are extended to a position approaching the receiver tank 20, and air sucked from there passes through the receiver tank 20. That is, the receiver tank 20 is located in the windward flow path of the air flow passing through the heat exchanger 1.

  When the blower 34 is operated, external air is sucked into the housing 30a from the rear air inlet 32 and the side air inlet 33. The sucked air passes through the heat exchanger 1 and exchanges heat with the heat exchanger 1. The air after heat exchange is sucked into the propeller fan 34b and is discharged out of the housing 30a through the exhaust port 31.

  Since the receiver tank 20 is disposed on the windward side of the bending corner portion 1a of the heat exchanger 1 and inside the corner portion of the housing 30a, which is normally a dead space, the receiver tank 20 is By providing, there is no need for extra space, and the effective space in the outdoor unit 30 is not reduced.

  The bending corner portion 1a of the heat exchanger 1 whose planar shape forms an L shape is closer to the header pipe 2 that forms an end on the short side than the header pipe 3 that forms an end on the long side of the L shape. Since the refrigerant inlet / outlet pipes 21 and 22 are connected to the header pipe 2, the refrigerant inlet / outlet pipes 21 and 22 can be short.

  As described above, the receiver tank 20 is located in the windward flow path of the air flow passing through the heat exchanger 1, and a part of the air sucked from the rear intake port 32 and the side intake port 33 passes through the receiver tank 20. Gracefully go through. Thereby, heat exchange is performed between the receiver tank 20 and the external air, and the condensation of the refrigerant can be promoted. Therefore, the heat exchange capability of the heat exchanger 1 can be further increased.

  When the separate air conditioner including the outdoor unit 30 is moved, a pump-down operation is performed in which all the refrigerant in the refrigeration cycle including the heat exchanger 1 is concentrated on the outdoor unit 30 side. This is an operation in which the compressor 37 is operated with the refrigerant outlet of the heat exchanger 1 closed, and the entire amount of refrigerant is sent to the heat exchanger 1 at high pressure. The heat exchanger 1 of the parallel flow type has a smaller capacity than the heat exchange capacity, and in the conventional one, when the pump down operation is performed, the pressure inside the heat exchanger 1 rises abnormally and exceeds the pressure limit. May damage the reliability of the product.

  In the configuration of the embodiment, as described above, the capacity of the receiver tank 20 is obtained by subtracting the capacity of the heat exchanger 1 and the capacity of the high-pressure side refrigerant pipe from the total refrigerant liquid amount in the refrigeration cycle including the heat exchanger 1. Since it is set to be higher than that, it is possible to receive all the refrigerant in the refrigeration cycle in the liquid state with the combined capacity of the heat exchanger 1, the receiver tank 20, and the high-pressure side refrigerant pipe. . For this reason, it is not necessary to generate an abnormal high pressure in the heat exchanger 1.

  5 to 7 show a second embodiment of the present invention. In the heat exchanger 1 of the second embodiment, a fifth flow path 15 is further formed below the fourth flow path 14. The vertical width of the fifth channel 15 is equal to or less than that of the fourth channel 14. Inside the header pipe 3, a partition plate 9d that separates the third flow path 13 and the fourth flow path 14 is provided. Inside the header pipe 2, a partition plate 9e that separates the third flow path 13 and the fourth flow path 14 is provided. The refrigerant inlet / outlet pipe 22 extends toward the header pipe 3 and is connected to a location facing the fourth flow path 14.

  When the heat exchanger 1 is used as a condenser, a gaseous, that is, overheated refrigerant flows into the header pipe 3 from the refrigerant inlet / outlet 7. The superheated refrigerant passes through the first flow path 11 from right to left and enters the header pipe 2, where it turns and enters the second flow path 12. The refrigerant passes through the second flow path 12 from the left to the right and returns to the header pipe 3. The refrigerant turns in the header pipe 3 and enters the third flow path 13, passes through the third flow path 13 from the right to the left, and enters the header pipe 2. During this reciprocation, the overheated refrigerant dissipates heat and liquefaction proceeds.

  The refrigerant that has entered the header pipe 2 from the third flow path 13 enters the receiver tank 20, exits from there to the refrigerant inlet / outlet pipe 22, and then enters the fourth flow path 14 that is the supercooling region. The refrigerant passes through the fourth flow path 14 from right to left and enters the header pipe 2, where it turns to enter the fifth flow path, returns to the header pipe 3, and flows out from the refrigerant inlet / outlet 8. Heat exchange proceeds and condenses while passing through the fourth flow path 14 and the fifth flow path 15, and the refrigerant becomes supercooled.

  8 to 10 show a third embodiment of the present invention. In the heat exchanger 1 of the third embodiment, a fifth flow path 15 is further formed below the fourth flow path 14 as in the second embodiment. The vertical width of the fifth channel 15 is equal to or less than that of the fourth channel 14. Inside the header pipe 2, a partition plate 9d separating the third flow path 13 and the fourth flow path 14 and a partition plate 9e separating the fourth flow path 14 and the fifth flow path 15 are provided. When the heat exchanger 1 is used as a condenser, the refrigerant flows through the fifth flow path 15 from right to left, that is, from the header pipe 3 to the header pipe 2.

  As in the first embodiment, the refrigerant inlet / outlet pipes 21 and 22 of the receiver tank 20 face the third flow path 13, and the refrigerant inlet / outlet pipe 22 faces the fourth flow path 14. A refrigerant inlet / outlet pipe 23 is connected to a portion of the header pipe 2 facing the fifth flow path 15. The refrigerant inlet / outlet pipe 23 extends toward the header pipe 3, and the tip thereof serves as the refrigerant inlet / outlet 8.

  When the heat exchanger 1 is used as a condenser, the superheated refrigerant flowing into the header pipe 3 from the refrigerant inlet / outlet 7 passes through the first flow path 11 from the right to the left, enters the header pipe 2, and turns there. It enters the second flow path 12, passes through the second flow path 12 from the left to the right, and returns to the header pipe 3. The refrigerant turns again and enters the third flow path 13, passes through the third flow path 13 from the right to the left, and enters the header pipe 2.

  The refrigerant that has entered the header pipe 2 from the third flow path 13 enters the receiver tank 20, exits from there to the refrigerant inlet / outlet pipe 22, and then enters the fourth flow path 14. The refrigerant passes through the fourth flow path 14 from the left to the right and enters the header pipe 3. The refrigerant that has entered the header pipe 3 makes a final turn, enters the fifth flow path, passes through the fifth flow path 15 from right to left, and enters the header pipe 2. From there, the refrigerant enters the refrigerant inlet / outlet pipe 23, flows through the refrigerant inlet / outlet pipe 23 toward the header pipe 3, and flows out of the refrigerant inlet / outlet 8.

  The fourth flow path 14 and the fifth flow path 15 are supercooling regions. Since the 4th flow path 14 and the 5th flow path 15 continue after the receiver tank 20 is connected to the header pipe 2 by the refrigerant | coolant in / out pipes 21 and 22, a refrigerant | coolant can be reliably made into a supercooled state.

  FIG. 11 shows a fourth embodiment of the present invention. The fourth embodiment has a configuration in which the heat exchanger 1 of the first embodiment is turned upside down, and the first flow path 11, the second flow path 12, the third flow path 13, and the fourth flow path 14 are provided. They are lined up from bottom to top, not from top to bottom. When the heat exchanger 1 is used as a condenser, the refrigerant flows in from the lower refrigerant inlet / outlet 7 and flows out from the upper refrigerant inlet / outlet 8. When the heat exchanger 1 is used as an evaporator, the refrigerant flows in from the upper refrigerant inlet / outlet 8 and flows out from the lower refrigerant inlet / outlet 7.

  The receiver tank 20 is connected to and fixed to the header pipe 2 by a refrigerant inlet / outlet pipe 21 facing the third flow path 13 and a refrigerant inlet / outlet pipe 22 facing the fourth flow path 14. As in the first embodiment, the refrigerant that has entered the header pipe 2 from the third flow path 13 flows into the fourth flow path 14 via the receiver tank 20.

  FIG. 12 shows a fifth embodiment of the present invention. The fifth embodiment has a configuration in which the heat exchanger 1 of the second embodiment is turned upside down, and the first flow path 11, the second flow path 12, the third flow path 13, the fourth flow path 14, and The fifth flow path 15 is arranged from the bottom to the top instead of from the top to the bottom. When the heat exchanger 1 is used as a condenser, the refrigerant flows in from the lower refrigerant inlet / outlet 7 and flows out from the upper refrigerant inlet / outlet 8. When the heat exchanger 1 is used as an evaporator, the refrigerant flows in from the upper refrigerant inlet / outlet 8 and flows out from the lower refrigerant inlet / outlet 7.

  Similar to the second embodiment, the refrigerant inlet / outlet pipe 22 exiting from the receiver tank 20 is routed toward the header pipe 3 and connected to a location of the header pipe 3 facing the fourth flow path 14.

  FIG. 13 shows a sixth embodiment of the present invention. The sixth embodiment has a configuration in which the heat exchanger 1 of the third embodiment is turned upside down, and includes a first flow path 11, a second flow path 12, a third flow path 13, a fourth flow path 14, and a first flow path. The five flow paths 15 are arranged from the bottom to the top, not from the top to the bottom. As in the third embodiment, inside the header pipe 2, there are a partition plate 9d that separates the third flow path 13 and the fourth flow path 14, and a partition plate 9e that separates the fourth flow path 14 and the fifth flow path 15. Is provided. When the heat exchanger 1 is used as a condenser, the refrigerant flows in from the lower refrigerant inlet / outlet 7 and flows out from the upper refrigerant inlet / outlet 8. When the heat exchanger 1 is used as an evaporator, the refrigerant flows in from the upper refrigerant inlet / outlet 8 and flows out from the lower refrigerant inlet / outlet 7.

  In the refrigerant inlet / outlet pipes 21 and 22 of the receiver tank 20, the refrigerant inlet / outlet pipe 21 faces the third flow path 13, and the refrigerant inlet / outlet pipe 22 faces the fourth flow path 14. A refrigerant inlet / outlet pipe 23 is connected to a portion of the header pipe 2 facing the fifth flow path 15. The refrigerant inlet / outlet pipe 23 extends toward the header pipe 3, and the tip thereof serves as the refrigerant inlet / outlet 8.

  The fourth flow path 14 and the fifth flow path 15 are supercooling regions. Since the 4th flow path 14 and the 5th flow path 15 continue after the receiver tank 20 is connected to the header pipe 2 by the refrigerant | coolant in / out pipes 21 and 22, a refrigerant | coolant can be reliably made into a supercooled state.

  FIG. 14 shows a seventh embodiment of the present invention. In the seventh embodiment, two partition plates 9a and 9c are provided in the header pipe 3 with an interval in the vertical direction, and the partition plate is located in the header pipe 2 at the same height as the partition plate 9c. 9b is provided. As the flow path, the first flow path 11 to the third flow path 13 exist.

  The refrigerant inlet / outlet pipe 21 of the receiver tank 20 is routed toward the header pipe 3 and connected to a location facing the second flow path 12. The refrigerant inlet / outlet pipe 22 is connected to a portion of the header pipe 2 facing the third flow path 13.

  When the heat exchanger 1 is used as a condenser, the superheated refrigerant flowing into the header pipe 3 from the refrigerant inlet / outlet 7 passes through the first flow path 11 from the right to the left, enters the header pipe 2, and turns there. It enters the second flow path 12, passes through the second flow path 12 from the left to the right, and returns to the header pipe 3. The refrigerant enters the receiver tank 20 through the refrigerant inlet / outlet pipe 21, and then enters the refrigerant inlet / outlet pipe 22, and then enters the third flow path 13. The refrigerant passes through the third flow path 13 from the left to the right, enters the header pipe 3, and flows out from the refrigerant inlet / outlet 8.

  FIG. 15 shows an eighth embodiment of the present invention. The eighth embodiment has a configuration in which the heat exchanger 1 of the seventh embodiment is turned upside down, and the first flow path 11, the second flow path 12, and the third flow path 13 are not from top to bottom. They are lined up from bottom to top. When the heat exchanger 1 is used as a condenser, the refrigerant flows in from the lower refrigerant inlet / outlet 7 and flows out from the upper refrigerant inlet / outlet 8. When the heat exchanger 1 is used as an evaporator, the refrigerant flows in from the upper refrigerant inlet / outlet 8 and flows out from the lower refrigerant inlet / outlet 7.

  Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

  The present invention is widely applicable to side flow parallel flow heat exchangers.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 1a Bending corner part 2, 3 Header pipe 4 Flat tube 5 Refrigerant passage 6 Corrugated fin 7, 8 Refrigerant inlet / outlet 9a, 9b, 9c, 9d Partition plate 11 1st flow path 12 2nd flow path 13 3rd flow Path 14 Fourth flow path 15 Fifth flow path 20 Receiver tank 21, 22, 23 Refrigerant inlet / outlet pipe 30 Outdoor unit 30a Housing 34 Blower 37 Compressor

Claims (9)

Two header pipes arranged in parallel at intervals, and a plurality of flat tubes arranged between the two header pipes and having a refrigerant passage provided therein communicated with the inside of the header pipe In the parallel flow type heat exchanger of the side flow method bent so that the planar shape forms an L shape,
When the heat exchanger is used as a condenser, a receiver tank is connected to one of the header pipes at a location where a supercooling region follows, and the receiver tank is connected to a bent corner portion of the heat exchanger. A heat exchanger arranged on the windward side.   The refrigerant inlet / outlet pipe for introducing the refrigerant into the receiver tank and the refrigerant inlet / outlet pipe for discharging the refrigerant from the receiver tank are both connected to a header pipe forming an end of the L-shaped short side. Item 2. The heat exchanger according to Item 1.   A refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank is connected to a header pipe having an end of the L-shaped short side, while a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank has an end of the L-shaped long side. The heat exchanger according to claim 1, wherein the heat exchanger is connected to a header pipe.   A refrigerant inlet / outlet pipe for introducing refrigerant into the receiver tank is connected to a header pipe having an end of the L-shaped long side, while a refrigerant inlet / outlet pipe for discharging refrigerant from the receiver tank has an end of the L-shaped short side. The heat exchanger according to claim 1, wherein the heat exchanger is connected to a header pipe.   Both the refrigerant inlet / outlet pipe for introducing the refrigerant into the receiver tank and the refrigerant inlet / outlet pipe for discharging the refrigerant from the receiver tank are connected to the header pipe forming the end of the L-shaped short side, and the header pipe The heat exchanger according to claim 1, wherein a refrigerant inlet / outlet pipe serving as a refrigerant outlet when the heat exchanger is used as a condenser is connected.   6. The heat exchanger according to claim 1, wherein the receiver tank is disposed in a windward flow path of an air flow passing through the heat exchanger.   The capacity of the receiver tank is set to be equal to or larger than the total refrigerant liquid amount in the refrigeration cycle including the heat exchanger minus the capacity of the heat exchanger and the capacity of the high-pressure side refrigerant pipe. The heat exchanger according to any one of claims 1 to 6.   The supercooling region of the heat exchanger is set to an area that is equal to or larger than an area that can ensure the degree of supercooling required at the time of rated capacity. Heat exchanger.   An air conditioner in which the heat exchanger according to any one of claims 1 to 8 is mounted on an outdoor unit.

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