JP2015105771A - Heat exchanger - Google Patents

Abstract

When both the refrigerant inlet and outlet of a heat exchanger are in the center of the heat exchanger, the inlet and outlet are close to each other. Therefore, heat exchange occurs between the refrigerant flowing into the heat exchanger and the refrigerant before flowing out through the heat exchanger, and the heat exchange efficiency between the refrigerant flowing in the heat exchanger and the air is deteriorated. It was. Accordingly, in the present invention, the refrigerant flows into the heat transfer tube array on the windward side, and after passing through the heat transfer tube on the windward side several times in succession, it is divided into two passes by a flow divider, and is transferred to the heat transfer tube on the windward side. Each flows in and flows out from the heat transfer tubes in the vicinity of the flow divider in the heat transfer tube array on the windward side via the heat transfer tubes at the upper and lower ends of the heat exchanger. Thereby, since the inflow port and the outflow port of the refrigerant | coolant of a heat exchanger are separated, the heat exchange between refrigerant | coolants can be suppressed. [Selection] Figure 3

Description

  The present invention relates to a heat exchanger having a plurality of refrigerant flow paths.

  Conventionally, an air conditioner includes an indoor unit indoors and an outdoor unit outdoors, and a heat exchanger is installed inside the indoor unit and the outdoor unit. In the heat exchanger, air is heated or cooled by heat exchange between the refrigerant flowing in the heat exchanger and the air.

  As disclosed in Patent Document 1, among the heat exchangers composed of three blocks, the refrigerant flows in from the two inlets in the central part on the windward side of the heat exchanger arranged in the middle. The upper refrigerant flow path that flows out from the outlet in the central part via the upper block of the heat exchanger, and the lower refrigerant flow that flows out from the outlet in the central part via the lower block of the heat exchanger There is a heat exchanger with a refrigerant flow path.

JP 2001-1520989 A

  In the heat exchanger disclosed in Patent Document 1, since the refrigerant inlet and outlet of the heat exchanger are both in the central portion of the heat exchanger, the refrigerant channels having temperature differences are close to each other. Therefore, heat exchange occurs between the refrigerant flowing into the heat exchanger and the refrigerant flowing out of the heat exchanger via the heat exchanger, and the heat exchange efficiency between the air passing through the heat exchanger and the refrigerant is deteriorated. There was a problem.

  Then, this invention aims at suppressing the heat exchange between refrigerant | coolants by separating the inflow port and the outflow port of the refrigerant | coolant of a heat exchanger.

  The finned tube heat exchanger according to the present invention has a plurality of fins stacked with a predetermined gap, and air is circulated through the gap, and two rows are circulated in the direction in which the air passes through the fins in the stacking direction. Heat transfer tubes arranged in an M-stage (M is a natural number of 4 or more) arrangement in a direction crossing the direction to be generated, and the refrigerant is circulated through a refrigerant flow path formed by sequentially connecting the heat transfer tubes for each row. When the finned tube heat exchanger functions as an evaporator, from the Nth stage (1 <N <M-2, where N is a natural number) in the windward row, The refrigerant that has flowed in sequentially flows to the P-th stage heat transfer pipe (N <P <M, where P is a natural number) in the windward row, flows out of the P-th stage heat transfer pipe, and then is divided into two refrigerant flow paths. , One of the divided refrigerant flows to the (N-1) th stage heat transfer tube in the windward row The other refrigerant that has flowed into and divided into the refrigerant flows into the P + 1 stage heat transfer tube in the windward row, and the refrigerant that has flowed into the N-1 heat transfer tube in the windward row is the first row in the windward row. Through the first heat transfer tube in the row on the leeward side and the first heat transfer tube in the leeward side, the refrigerant flows in sequence to the Xth heat transfer tube in the leeward side example (N <X <M-1, where X is a natural number). The refrigerant flowing out of the X-th stage heat transfer tubes and flowing into the P + 1-th stage heat transfer tubes in the windward row passes through the M-th heat transfer tube in the leeward row and the M-th heat transfer tube in the leeward row. Via the Y-stage heat transfer tubes in the leeward row (X <Y <M, where Y is a natural number), flow out of the Y-stage heat transfer tubes, and flow through the X-stage of the leeward row At least one of the heat transfer tubes and the Y-th heat transfer tube in the leeward row is a heat transfer tube in the P-th, P-1 or P + 1-th row in the leeward row.

  Further, the finned tube heat exchanger according to the present invention is housed in the casing of the air conditioner, and is arranged on the back side in the casing and on the front side in the casing. And an upper heat exchange part disposed on the front side of the casing and above the front heat exchange part, and the Nth stage heat transfer tube is at one end in the longitudinal direction of the fin of the upper heat exchange part The heat transfer tube is a heat transfer tube at the other end in the longitudinal direction of the fin of the upper heat exchanger, and one of the heat transfer tube of the (N−1) th stage and the heat transfer pipe of the (P + 1) th stage. Is a heat transfer tube above the back surface heat exchange unit, and the other is a heat transfer tube above the front surface heat exchange unit.

  According to the heat exchanger as described above, since the refrigerant inlet and outlet of the heat exchanger are separated from each other, heat exchange between the refrigerant flow paths having a temperature difference can be suppressed.

It is a block diagram of the refrigerant circuit of the air conditioning apparatus of this invention. It is a cross-sectional block diagram of the indoor unit of the indoor unit of a present Example. It is a figure showing the refrigerant | coolant flow path in the indoor heat exchanger which concerns on Embodiment 1 of this invention. It is a figure showing the refrigerant | coolant flow path in the indoor heat exchanger which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The air conditioner according to Embodiment 1 of the present invention includes an indoor unit 100 installed indoors and an outdoor unit 200 installed outdoor. Heat exchangers (110, 210) are accommodated in the indoor unit 100 and the outdoor unit 200, respectively, and each heat exchanger (110, 210) is connected by a refrigerant pipe to form a refrigerant circuit. Yes. The configuration of the refrigerant circuit of the air conditioner is shown in FIG.

  This refrigerant circuit mainly includes an indoor heat exchanger 110, a compressor 220, a four-way valve 230, an outdoor heat exchanger 210, and an expansion valve 240.

  The indoor heat exchanger 110 provided in the indoor unit 100 exchanges heat between the introduced indoor air and the refrigerant. The indoor heat exchanger 110 is connected to a liquid pipe 310 through which liquid refrigerant flows and a gas pipe 320 through which gas refrigerant flows. In addition, the indoor unit 100 is provided with a cross flow fan 111 that is a blower for sucking indoor air and blowing out air into the room after heat exchange with the refrigerant in the indoor heat exchanger 110. The cross flow fan 111 is formed in a cylindrical shape and is rotationally driven by an indoor fan motor 112 provided in the indoor unit 100.

  The outdoor unit 200 includes a compressor 220, a four-way valve 230 connected to the discharge side of the compressor 220, an accumulator 250 connected to the suction side of the compressor 220, and an outdoor heat exchange connected to the four-way valve 230. 210 and an expansion valve 240 connected to the outdoor heat exchanger 210 are provided. The expansion valve 240 is connected to the liquid pipe 310 via the liquid closing valve 311, and is connected to one end of the indoor heat exchanger 110 via the liquid pipe 310. Further, the four-way valve 230 is connected to the gas pipe 320 via the gas closing valve 321, and is connected to the other end of the indoor heat exchanger 110 via the gas pipe 320. In addition, the outdoor unit 200 is provided with a propeller fan 211 for blowing out the air after heat exchange with the refrigerant in the outdoor heat exchanger 210. The propeller fan 211 is rotationally driven by an outdoor fan motor 212.

  FIG. 2 shows a cross-sectional configuration diagram of the indoor unit 100. The indoor unit 100 includes a casing 101, and the indoor heat exchanger 110 and the cross flow fan 111 described above are accommodated in the casing 101 of the indoor unit 100. The indoor heat exchanger 110 is divided into three heat exchange units (a rear heat exchange unit 110a, an upper heat exchange unit 110b, and a front heat exchange unit 110c) as will be described later. The casing 101 is provided with an inlet 103 for taking in indoor air and an outlet 104 through which air is blown into the indoor space by the crossflow fan 111. The suction port 103 is provided in the upper front surface and the top surface of the casing 101, and the air outlet 104 is provided in the lower front surface. The indoor heat exchanger 110 and the cross flow fan 111 are disposed in the casing 101 on the side where the indoor heat exchanger 110 is close to the suction port 103 and the cross flow fan 111 is close to the air outlet 104. That is, the indoor heat exchanger 110 is disposed on the upstream side in the airflow direction with respect to the cross flow fan 111. Here, the indoor heat exchanger 110 is arranged in the casing 101 so as to be bent in multiple stages so as to surround the cross flow fan 111 from the suction port 103 side.

  In this embodiment, the indoor heat exchanger 110 is a finned tube heat exchanger. The indoor heat exchanger 110 has a plurality of fins that are stacked with a predetermined gap and allow air to flow through the gap. Moreover, it penetrates in the laminating direction of the fins, is arranged in two rows in the direction of circulating air, and M stages (M is a natural number of 4 or more. In this embodiment, M = 20) in the direction intersecting with the direction of circulating air. The refrigerant is circulated through a refrigerant flow path formed by sequentially connecting the heat transfer tubes for each row. Moreover, it is comprised from three heat exchange parts with the heat exchanger of 3 steps | paragraph bending type. The back surface heat exchange unit 110 a is disposed so as to be inclined from the top surface side of the indoor unit 100 to the back surface side of the indoor unit 100 so as to surround from the top surface side to the back surface side of the cross flow fan 111. The upper heat exchange unit 110b is disposed so as to be inclined from the top surface side of the indoor unit 100 to the upper front side of the indoor unit 100 so as to surround from the top surface side of the cross flow fan 111 to the upper front side. The front heat exchanging part 110c is arranged below the upper heat exchanging part 110b so as to surround from the upper front side of the cross flow fan 111 to the lower front side.

  The indoor heat exchanger 110 of the present embodiment has three refrigerant flow paths (hereinafter referred to as 1a refrigerant flow path 410, 1b refrigerant flow path 420, and 1c refrigerant flow path 430) through which the refrigerant flows. The three 1a refrigerant flow paths 410, 1b refrigerant flow paths 420, and 1c refrigerant flow paths 430 will be described with reference to the drawings. FIG. 3 is a diagram illustrating the first a refrigerant flow path 410, the first b refrigerant flow path 420, and the first c refrigerant flow path 430 in the indoor heat exchanger 110. In FIG. 3, the solid line represents the U-shaped tube 121 on the front side of the heat transfer tube 120, and the thick broken line represents the back of the heat transfer tube 120. It is the hairpin part 120a in the side. In the indoor heat exchanger 110, the plurality of heat transfer tubes 120 form two rows of heat transfer tubes on the windward side and the leeward side in the airflow direction. Here, the heat transfer tube row on the upstream side in the airflow direction is referred to as a first heat transfer tube row L1, and the heat transfer tube row on the downstream side in the airflow direction is referred to as a second heat transfer tube row L2. A first heat transfer tube array L1 (L1a, L1b, L1c) and a second heat transfer tube array L2 (L2a, L2b, L2c) are formed in each of the heat exchange units 110a, 110b, 110c.

  The first-a refrigerant flow path 410 is formed by connecting the heat transfer pipe 410a of the central four stages (from the third stage (N stage) to the sixth stage (P stage)) in the first heat transfer pipe row L1b of the upper heat exchange unit 110b. It is formed by sequentially connecting. The first-b refrigerant flow path 420 includes a lower two-stage (second stage (N-1 stage) and first stage) heat transfer tube 420a in the first heat transfer tube row L1b of the upper heat exchange unit 110b, and front heat exchange. 5 stages (from the 5th stage to the 1st stage) of the heat transfer pipes 420b in the first heat transfer tube array L1c of the section 110c and 5 stages (from the 1st stage to the 5th stage of the second heat transfer tube array L2c of the front heat exchange unit 110c (Stage) heat transfer tube 420c and lower six-stage (first to sixth (X)) heat transfer tubes 420d in the second heat transfer tube row L2b of the upper heat exchanging section 110b are sequentially connected to form. Has been. The first c refrigerant flow path 430 includes an upper two-stage (seventh stage (P + 1 stage) and eighth stage) heat transfer pipe 430a in the first heat transfer pipe row L1b of the upper heat exchange section 110b, and a rear heat exchange section 110a. 7 stages (7th stage (7th stage (Mth stage)) of heat transfer tubes 430b in the first heat transfer pipe row L1a and 7th stage (7th stage) in the second heat transfer tube row L2a of the rear heat exchange section 110a. The first (second stage to M-th) heat transfer pipe 430c and the upper two stages (the eighth stage and the seventh stage (Y stage)) in the second heat transfer tube row L2b of the upper heat exchange section 110b. The heat tubes 430d are sequentially connected.

  The first-a refrigerant channel 410 is a liquid refrigerant that is connected to the liquid pipe 310 to the third-stage (N-th) heat transfer pipe in the first heat transfer pipe row L1b of the upper heat exchanging section 110b and into which liquid refrigerant flows in and out. A flow divider 442 that includes an inflow / outflow tube 441 and diverts the refrigerant to a sixth-stage (P-stage) heat transfer pipe in the first heat transfer pipe row L1b of the upper heat exchange section 110b is connected. In the 1b refrigerant flow path 420, the second stage (N-1 stage) heat transfer tube in the first heat transfer tube row L1b of the upper heat exchange unit 110b is connected to one end of the flow divider 442, and the upper heat exchange unit 110b. A gas refrigerant inflow / outflow pipe 443 connected to the gas pipe 320 and into and out of the gas state refrigerant is connected to the sixth (Xth stage) heat transfer pipe in the second heat transfer pipe row L2b. The first c refrigerant flow path 430 is connected to the other end of the flow divider 442 at the seventh (P + 1) th heat transfer tube in the first heat transfer tube row L1b of the upper heat exchange unit 110b. A gas refrigerant inflow / outflow pipe 443 that is connected to the gas pipe 320 and flows in and out of the gas state refrigerant is connected to the seventh (Yth stage) heat transfer pipe in the second heat transfer pipe row L2b. When the indoor heat exchanger 110 functions as an evaporator, the refrigerant flows into the gas refrigerant inflow / outflow pipe 443 of the first b refrigerant flow path 420 and the gas refrigerant inflow / outflow pipe 443 of the first c refrigerant flow path 430, and the 1b refrigerant The flow is merged by the flow divider 442 via the flow path 420 and the first c refrigerant flow path 430, and flows out from the liquid refrigerant inflow / outflow pipe 441 of the first a refrigerant flow path 410 via the first a refrigerant flow path 410. When the indoor heat exchanger 110 functions as a condenser, the refrigerant flows into the liquid refrigerant inflow / outflow pipe 441 of the first-a refrigerant channel 410 and passes through the first-a refrigerant channel 410 through the flow divider 442 for two passes. From the gas refrigerant flow-in / out pipe 443 of the first b refrigerant flow path 420 and the gas refrigerant flow-in / flow pipe 443 of the first c refrigerant flow path 430 through the first b refrigerant flow path 420 and the first c refrigerant flow path 430, respectively. leak.

  In this manner, the heat exchanger tube connected to the liquid refrigerant inflow / outflow tube 441 and the heat transfer tube connected to the gas refrigerant inflow / outflow tube 443 are arranged so that heat interference does not easily occur. Since the refrigerant flowing in and the refrigerant flowing out of the indoor heat exchanger 110 can be prevented from exchanging heat through the indoor heat exchanger 110, heat exchange with air can be performed. It is possible to prevent a decrease in the heat exchange efficiency.

(Embodiment 2)
The air conditioner according to Embodiment 2 of the present invention is composed of the same refrigerant circuit as that of Embodiment 1. The description of the same constituent elements as those of the first embodiment is omitted. Therefore, the indoor heat exchanger 110 different from the first embodiment will be described.

  The indoor heat exchanger of this embodiment is shown in the figure. As in the first embodiment, the indoor heat exchanger 110 is a three-stage bending heat exchanger and includes three heat exchange units (a rear heat exchange unit 110a, an upper heat exchange unit 110b, and a front heat exchange unit 110c). ing.

  The indoor heat exchanger 110 of the present embodiment has three refrigerant channels (hereinafter referred to as a 2a refrigerant channel 510, a 2b refrigerant channel 520, and a 2c refrigerant channel 530) through which the refrigerant flows. The 2a refrigerant channel 510, the 2b refrigerant channel 520, and the 2c refrigerant channel 530 will be described with reference to the drawings.

  The second-a refrigerant flow path 510 sequentially connects the eight-stage (first (N-stage) to eighth (P-stage)) heat transfer pipes 510a in the first heat transfer pipe row L1b of the upper heat exchange section 110b. Is formed. The second b refrigerant flow path 520 includes a heat transfer tube 520a of the fifth stage (from the fifth stage (N-stage) to the first stage) in the first heat transfer pipe row L1c of the front heat exchange part 110c, and the front heat exchange part 110c. The second heat transfer tube row L2c of the second heat transfer tube row 520b in the second heat transfer tube row L2c and the lower heat transfer tube row L2b of the upper heat exchange section 110b in the second heat transfer tube row L2b (first step to sixth step). (Second (X stage)) heat transfer tubes 520c are sequentially connected. The second c refrigerant flow path 530 includes seven stages (the first stage (P + 1 stage) to the seventh stage (M stage)) of the heat transfer tubes 530a in the first heat transfer tube row L1a of the rear heat exchange section 110a, and the rear surface Seven stages (from the seventh stage (M stage) to the first stage) of heat transfer tubes 530b in the second heat transfer tube row L2a of the heat exchange unit 110a, and the upper portion of the second heat transfer tube row L2b of the upper heat exchange unit 110b Two stages (eight stage and seventh stage (Y stage)) of heat transfer tubes 530c are sequentially connected.

  The second-a refrigerant flow path 510 is a liquid refrigerant that is connected to the liquid pipe 310 to the first-stage (N-stage) heat transfer pipe in the first heat transfer pipe row L1b of the upper heat exchanging section 110b and into which liquid refrigerant flows in and out. A flow divider 542 that includes an inflow / outflow tube 541 and diverts the refrigerant to an eighth-stage (P-stage) heat transfer pipe in the first heat transfer pipe row L1b of the upper heat exchange section 110b is connected. The second b refrigerant flow path 520 is connected to one end of the flow divider 542 at the fifth (N−1) th heat transfer tube in the first heat transfer tube row L1c of the front heat exchange unit 110c, and the upper heat exchange unit 110b. A gas refrigerant inflow / outflow pipe 543 connected to the gas pipe 320 and into and out of the gas state refrigerant is connected to the sixth stage (Xth stage) heat transfer pipe in the second heat transfer pipe row L2b. The second c refrigerant flow path 530 is connected to the other end of the flow divider 542 in the first stage (P + 1 stage) heat transfer tube in the first heat transfer tube row L1a of the rear heat exchange unit 110a, and the upper heat exchange unit 110b. A gas refrigerant inflow / outflow pipe 543 connected to the gas pipe 320 and into and out of the gas state refrigerant is connected to the seventh (Yth stage) heat transfer pipe in the second heat transfer pipe row L2b. When the indoor heat exchanger 110 functions as an evaporator, the refrigerant flows into the gas refrigerant inflow / outflow tube 543 of the second b refrigerant flow path 520 and the gas refrigerant inflow / outflow pipe 543 of the second c refrigerant flow path 530, and the flow divider 542. And flows out from the liquid refrigerant inflow / outflow tube 541 of the second-a refrigerant channel 510. When the indoor heat exchanger 110 functions as a condenser, the refrigerant flows into the liquid refrigerant inflow / outflow pipe 541 of the second a refrigerant flow path 510 and passes through the flow divider 542 to gas in the second b refrigerant flow path 520. The refrigerant flows out from the refrigerant inflow / outflow tube 543 and the gas refrigerant inflow / outflow tube 543 of the second c refrigerant flow path 530.

  As described above, the liquid refrigerant inflow / outflow pipe 541 and the gas refrigerant inflow / outflow pipe 543 are disposed apart from the upper and lower portions of the upper heat exchange section 110b, so that the refrigerant flowing into the indoor heat exchanger 110 and the outflow from the indoor heat exchanger 110 are discharged. Since heat exchange with the air can be performed by preventing heat exchange with the refrigerant to be performed via the indoor heat exchanger 110, it is possible to prevent a decrease in heat exchange efficiency in the indoor heat exchanger. Moreover, since the refrigerant | coolant which flows into the heat exchanger tube in the 1st heat exchanger tube row | line | column L1b of the upper heat exchange part 110b has a near temperature difference of the refrigerant | coolants which flow into the adjacent heat exchanger tube in the same 1st heat exchanger tube row | line | column L1b, it adjoins. It is possible to prevent heat exchange between the refrigerants of the heat pipes and to exchange heat with air.

DESCRIPTION OF SYMBOLS 100 Indoor unit 110 Indoor heat exchanger 120 Heat transfer tube 200 Outdoor unit 210 Outdoor heat exchanger 410 1a refrigerant flow path 420 1b refrigerant flow path 430 1c refrigerant flow path 510 2a refrigerant flow path 520 2b refrigerant flow path 530 2c refrigerant flow path

Claims (2)

A plurality of fins laminated with a predetermined gap, and air flowing through the gap;
Heat transfer tubes that are arranged in an array of M stages (M is a natural number of 4 or more) in a direction crossing the direction of circulating air, passing through the fins in the laminating direction, in two rows in the direction of circulating air ,
A fin tube type heat exchanger that circulates a refrigerant in a refrigerant passage formed by sequentially connecting the heat transfer tubes for each row,
When the finned tube heat exchanger functions as an evaporator,
The refrigerant flowing from the Nth stage (1 <N <M-2, where N is a natural number) in the windward row is the Pth stage (N <P <M, where P is a natural number) in the windward row. To the heat transfer tubes, and after flowing out of the P-stage heat transfer tubes, are divided into two refrigerant flow paths,
One of the divided refrigerant flows into the N-1 stage heat transfer tube in the windward row,
The other of the divided refrigerant flows into the P + 1 stage heat transfer tube in the windward row,
The refrigerant flowing into the (N-1) th heat transfer tube in the leeward row passes through the first heat transfer tube in the leeward row and the first heat transfer tube in the leeward row. Circulates sequentially to the X-th stage (N <X <M-1, where X is a natural number) heat transfer tube in the side row, and flows out from the X-th heat transfer tube,
The refrigerant that has flown into the P + 1 stage heat transfer tube in the leeward row passes through the M stage heat transfer tube in the leeward row and the M stage heat transfer tube in the leeward row. Sequentially circulates up to the Y-stage heat transfer tubes (X <Y <M, where Y is a natural number) in the row, and flows out of the Y-stage heat transfer tubes,
At least one of the X-th heat transfer tube in the leeward row and the Y-th heat transfer tube in the leeward row is the P-th, P-1 or P + 1-th row in the leeward row. A finned tube heat exchanger characterized by being one of the heat transfer tubes. The finned tube heat exchanger is housed in a casing of an air conditioner,
A back surface heat exchange unit disposed on the back side in the casing;
A front heat exchange section disposed on the front side in the casing;
An upper heat exchanging part disposed on the front side of the casing and above the front heat exchanging part,
The N-th stage heat transfer tube is a heat transfer tube at one end in the longitudinal direction of the fin of the upper heat exchange part,
The P-stage heat transfer tube is a heat transfer tube at the other end in the longitudinal direction of the fin of the upper heat exchange section,
One of the heat transfer tubes of the (N-1) th stage and the heat transfer pipe of the (P + 1) th stage is a heat transfer pipe above the back surface heat exchange unit, and the other is a heat transfer tube above the front surface heat exchange unit. The finned tube heat exchanger according to claim 1.

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