JP6906141B2 - Heat exchanger shunt - Google Patents

Description

The present invention is composed of a pair of header pipes and a plurality of flat pipes having a plurality of refrigerant flow paths, and the air flowing between the plurality of flat pipes and the refrigerant flowing in the refrigerant flow paths of the flat pipes. It relates to a refrigerant divider of a heat exchanger that exchanges heat with.

Conventionally, it has been composed of a pair of header pipes facing each other in the horizontal direction, a plurality of flat pipes having a plurality of refrigerant flow paths, and heat transfer fins provided between the flat pipes, and a plurality of flat pipes. There are known heat exchangers that exchange heat between the air flowing between them and the refrigerant flowing in the refrigerant flow path of the flat pipe.

In this type of heat exchanger, in order to equalize the amount of refrigerant flowing out to each flat pipe, a double structure consisting of an outer pipe connecting a plurality of flat pipes and an inner pipe having refrigerant holes in the direction of gravity. A tube structure heat exchanger diversion device is disclosed. (See, for example, Patent Document 1).
11, 12 and 13 show the conventional method described in Patent Document 1 when the refrigerant flow direction in the flat tube is the x direction, the air flow direction is the y direction, and the gravity upward direction is the z direction. FIG. 12 is a cross-sectional view taken along the line xy of the heat exchanger diversion device, FIG. 12 is a cross-sectional view taken along the line AA of FIG. 11 (cross-sectional view of the xy plane of the conventional heat exchanger diversion device described in Patent Document 1). ), FIG. 13 is a cross-sectional view taken along the line BB of FIG. 11 (cross-sectional view of the yz plane of the flat tube in the heat exchanger using the conventional heat exchanger diversion device described in Patent Document 1).

As shown in FIGS. 11, 12, and 13, the heat exchanger 1 includes a plurality of flat pipes 3 formed by a plurality of refrigerant flow paths 2 and a pair of header pipes connecting both ends of the flat pipes 3. The header pipe 4 is composed of 4 and an outer pipe 5 connecting a plurality of flat pipes 3 and blows out a gas-liquid two-phase refrigerant that is sequentially increased from the lower side to the upper side in the upward direction of gravity (z direction). It has a double pipe structure composed of an inner pipe 7 provided with a refrigerant hole 6.

As a result, the amount of refrigerant flowing out to the lower flat pipe that easily flows due to gravity is reduced, and the amount of refrigerant flowing out to the upper flat pipe that is difficult to flow is increased, so that the amount of refrigerant flowing through the upper flat pipe and the lower side The amount of refrigerant flowing through the flat pipe can be made uniform.

Japanese Unexamined Patent Publication No. 3-195873

However, in the conventional configuration, the refrigerant hole provided in the inner pipe has a small opening area with respect to the width in the longitudinal direction (y direction) of the flat pipe, and among the gas-liquid two-phase refrigerant blown out from the refrigerant hole, a liquid having a high density. Since the refrigerant has a large inertial force, easily travels straight, and the gas refrigerant, which is lighter than the liquid refrigerant, easily diffuses, a highly moist refrigerant exists in the space between the refrigerant hole and the refrigerant flow path near the refrigerant hole. , Refrigerant with low humidity tends to exist in the space between the refrigerant hole and the refrigerant flow path far from the refrigerant hole, and the state of the refrigerant flows differently for each of a plurality of refrigerant flow paths, so that each refrigerant flows. The position where the refrigerant completes evaporation differs in the flow path, the flat tube cannot be used effectively, and there is a problem that the heat exchanger performance deteriorates.

In particular, the heat transfer rate is high due to the front edge effect, and the low-humidity refrigerant is placed in the refrigerant flow path located on the upstream side of the air flow, and the low-humidity refrigerant is placed in the refrigerant flow path located on the downstream side of the air flow. When a high amount of refrigerant flows, the position where the refrigerant completes evaporation differs greatly between the upstream side and the downstream side of the air flow, so that the heat exchanger performance is significantly deteriorated.

The present invention solves the above-mentioned conventional problems, and is a refrigerant flowing in each refrigerant flow path by flowing a highly moist refrigerant in a flow path that easily evaporates and a low humidity refrigerant in a flow path that does not easily evaporate. However, it is an object of the present invention to provide a heat exchanger diversion device that can suppress early evaporation or flow without evaporating, and can make the position where the refrigerant completes evaporation uniform in each refrigerant flow path. ..

In order to solve the above-mentioned conventional problems, the heat exchanger of the present invention is a heat exchanger provided with a flat pipe having a plurality of refrigerant flow paths and a pair of header pipes connecting both ends of the flat pipe. in, at least one of the header pipe, and the outer tube for connecting a plurality of flat tubes, an inner tube provided with a cold Nakadachiana you outflow refrigerant into the flat tubes in the connection direction of the side surface of the flat tube, in which is constituted With a double pipe structure, the central axis of the inner pipe passes through the central portion of the width in the longitudinal direction of the flat pipe and is parallel to the direction of gravity.
It is eccentric to the upstream side of the air flow from the central surface.

This makes it easier to blow out highly moist refrigerant from the inner pipe to the front of the refrigerant flow path of the flat pipe on the upstream side of the air flow, which has a high heat transfer coefficient. Highly moist refrigerant easily flows through the road.

In the heat exchanger shunt of the present invention, since the position where the refrigerant completes evaporation can be made uniform in each refrigerant flow path of the flat pipe, the flat pipe can be effectively used and the heat exchanger performance can be improved. can.

Cross-sectional view of the xx plane of the header pipe according to the first embodiment of the present invention. Cross-sectional view of the xy plane of the header pipe according to the first embodiment of the present invention. Cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe of the first embodiment of the present invention. Cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe in the first modification of the first embodiment of the present invention. Cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe in the second modification of the first embodiment of the present invention. Cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe in the third modification of the first embodiment of the present invention. XY plan view showing the internal structure of the outdoor unit to which the heat exchanger is applied X-z plan view showing the internal structure of the outdoor unit to which the heat exchanger is applied Cross-sectional view of the xy plane of the header pipe according to the second embodiment of the present invention. Cross-sectional view of the flat tube yz plane in the heat exchanger using the header pipe according to the second embodiment of the present invention. Sectional view of the x-z plane of the header pipe of a conventional heat exchanger Sectional view of the xy plane of the header pipe of a conventional heat exchanger Cross-sectional view of the yz plane of the flat tube of a conventional heat exchanger

The first invention includes a flat pipe having a plurality of refrigerant flow paths, a pair of header pipes in which the plurality of flat pipes are installed in the horizontal direction and both ends of the flat pipes are connected to each other, and the plurality of flat pipes. In a heat exchanger connected in parallel with each other along the axial direction (gravity direction) of the header pipe, at least one header pipe flows out to the outer pipe connecting a plurality of flat pipes and the flat pipe. The double pipe structure is composed of an inner pipe having a plurality of refrigerant holes provided on the side surface of the flat pipe on the connecting side.

The refrigerant hole passes through the central portion of the width in the longitudinal direction of the flat pipe, and is wider on the upstream side of the air flow than on the downstream side of the air flow with reference to the central surface parallel to the direction of gravity.
As a result, a highly moist refrigerant is blown out from the inner pipe to the front of the refrigerant flow path of the flat pipe on the upstream side of the air flow having a high heat transfer coefficient, and into the refrigerant flow path of the flat pipe on the upstream side of the air flow. , The highly moist refrigerant easily flows.

Highly moist refrigerant is in the flow path that easily evaporates, and gas-state (low moistness) refrigerant staying in the outer pipe is in the flow path of the flat tube on the downstream side of the air flow that is hard to evaporate. Since the position where the refrigerant is completely evaporated can be made uniform in the flow and each refrigerant flow path, the flat tube can be effectively used and the heat exchanger performance can be improved.

In the second invention, the central axis of the inner pipe passes through the central portion of the width in the longitudinal direction of the flat pipe and is eccentric to the upstream side of the air flow from the central plane parallel to the direction of gravity. A refrigerant hole is provided at a position where the line connecting the central axis of the above is parallel to the direction of the refrigerant flow in the refrigerant flow path of the flat pipe.
As a result, the gas-liquid two-phase refrigerant is blown out from the inner pipe so as to go straight toward the refrigerant flow path on the upstream side of the air flow, collides with the wall separating the refrigerant flow path and the refrigerant flow path, and inside the outer pipe. Since the refrigerant is suppressed from being agitated, the flow velocity of the refrigerant is fast and it is easy to be agitated. Even during high-capacity operation, the dampness remains blown out from the inner pipe to the refrigerant flow path on the upstream side of the air flow. It is easy for the low-humidity refrigerant that is staying in the outer pipe to flow into the refrigerant flow path on the downstream side of the air flow, and the position where the refrigerant completes evaporation is made uniform in each refrigerant flow path. be able to.

Further, since it is suppressed that the refrigerant collides with the wall separating the refrigerant flow path and the refrigerant flow path and becomes a flow resistance, the blown-out refrigerant is smoothly flowed into the refrigerant flow path in the outer pipe. It is possible to suppress the residual liquid refrigerant on the lower side, prevent non-uniformity of the gas-liquid distribution in the direction of gravity, and make the state of the refrigerant flowing to each flat pipe uniform.

In addition, refrigeration that remains together with the liquid refrigerant by flowing a highly moist refrigerant through the refrigerant flow path of the flat pipe on the upstream side of the air flow, where the refrigerant evaporates and the refrigerating machine oil that circulates together tends to remain. Since the machine oil can be returned, the inhibition of heat exchange due to the residual refrigerating machine oil can be suppressed, and the heat exchanger performance can be improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.
(Embodiment 1)
1, FIG. 2 and FIG. 3 show the embodiment of the present invention in the case where the refrigerant flow direction in the flat pipe is the x direction, the air flow direction is the y direction, and the gravity upward direction is the z direction. A cross-sectional view of the xx plane of the heat exchanger diversion device, FIG. 2 is a cross-sectional view of AA of FIG. 1 (cross-sectional view of the xy plane of the heat exchanger diversion device according to the first embodiment of the present invention). FIG. 3 is a cross-sectional view taken along the line BB of FIG. 1 (a cross-sectional view taken along the yz plane of a flat tube in a heat exchanger using the header pipe according to the first embodiment of the present invention).

In FIGS. 1, 2, and 3, the heat exchanger 10 includes a plurality of flat tubes 11 and a pair of header pipes 12a and 12b.

The plurality of flat pipes 11 are arranged in the horizontal direction (x direction) along the axial direction (z direction) of the header pipes 12a and 12b so as to be parallel to each other, and the refrigerant in the flat pipe 11 is arranged. The flow path 13 communicates with the inside of the header pipes 12a and 12b.

At least one header pipe 12a is formed by an outer pipe 14 connecting a plurality of flat pipes 11 and an inner pipe 16 having a refrigerant hole 15 for discharging a refrigerant to the flat pipe 11 on the side surface of the flat pipe 11 on the connecting side. It has a double-tube structure, and is formed into a cylindrical shape by extrusion-molding a metal material such as aluminum.

Further, refrigerant pipes 17a and 17b are connected to one end of the header pipes 12a and 12b, respectively. Each of these refrigerant pipes 17a and 17b is configured to function as an inlet or outlet of the refrigerant.

A plurality of refrigerant holes 15 exist in the axial direction (z direction) of the inner pipe 16 so as to correspond to the flat pipe 11, and at the same height position in the axial direction (z direction) of the inner pipe 16, the refrigerant holes 15 are present. The upstream side of the air flow is wider than the downstream side of the air flow, passing through the central portion of the width of the flat tube 11 in the longitudinal direction (y direction) and parallel to the central surface parallel to the gravity direction (z direction). There is.

FIG. 4 is a cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe of the modification 1 of the first embodiment of the present invention, and FIG. 5 is the cross-sectional view of the first embodiment of the present invention. A cross-sectional view of the yz plane of the flat tube in the heat exchanger using the header pipe of the second modification, FIG. 6 shows the flatness in the heat exchanger using the header pipe of the third modification of the first embodiment of the present invention. It is sectional drawing of the yz plane of a pipe.

As shown in FIG. 4, the refrigerant hole 15 passes through the central portion of the width in the longitudinal direction of the flat tube 11, and is on the upstream side (−y direction) of the air flow with reference to the central surface parallel to the gravity direction (z direction). As shown in FIG. 5, even if the round hole is provided at a staggered position, it passes through the central portion of the width of the flat tube 11 in the longitudinal direction and is upstream of the air flow with reference to the central surface parallel to the gravity direction (z direction). As shown in FIG. 6, even an asymmetric hole having a large side (−y direction) and a small downstream side (+ y direction) of the air flow passes through the central portion of the width in the longitudinal direction of the flat tube 11 and passes through the center of the width in the longitudinal direction (z). Even if multiple round holes with the same opening area are provided so that the number is large on the upstream side (-y direction) of the air flow and small on the downstream side (+ y direction) of the air flow with reference to the central surface parallel to the direction). good.

When the heat exchanger configured as described above functions as an evaporator, the gas-liquid two-phase refrigerant flowing from the refrigerant pipe 17a into the inner pipe 16 of the header pipe 12a flows from the plurality of refrigerant holes 15. , It blows out to the inside of the outer pipe 14, flows in the + x direction through each refrigerant flow path 13 in each flat pipe 11, and is sent to the inside of the header pipe 12b. When the refrigerant flows through each of the refrigerant flow paths 13 in the flat pipe 11, heat exchange is performed with the air flowing in the + y direction between the flat pipes 11. Then, the refrigerant sent to the header pipe 12b flows out from the refrigerant pipe 17b.

Since it becomes easy to blow out a highly moist refrigerant from the inner pipe 16 to the front of the refrigerant flow path 13 of the flat pipe 11 on the upstream side of the air flow having a high heat transfer coefficient, the flat pipe 11 on the upstream side of the air flow A highly moist refrigerant easily flows through the refrigerant flow path 13.

As the refrigerant, for example, a mixed refrigerant containing R410A, R32 and R32 is used.

Next, the use of the present embodiment will be described by taking as an example the case where the heat exchanger 10 of the present embodiment is used for the outdoor unit 20 of the air conditioner.

FIG. 7 is a xy plan view showing the internal structure of the outdoor unit 20 to which the heat exchanger 10 of the present embodiment is applied, and FIG. 8 is a plan view of the outdoor unit 20 to which the heat exchanger 10 of the present embodiment is applied. It is an xz plan view which shows the internal structure.

As shown in FIGS. 7 and 8, the outdoor unit 20 includes a compressor 21, a switching valve 22, an outdoor expansion valve 23, a blower 24, and a heat exchanger 10. The outdoor unit 20 and the indoor unit (not shown) are connected by a liquid pipe 25 and a gas pipe 26.

Two heat exchangers 10 are installed in the air flow direction (y direction), and one header pipe 12a of the heat exchanger 10 installed on the upstream side of the air flow has a double pipe structure and has a refrigerant. One header pipe 32a of the heat exchanger 30, which is connected to the outdoor expansion valve 23 via the pipe 17a and is installed on the downstream side of the air flow, is connected to the switching valve 22 via the refrigerant pipe 37a. is doing.

The other header pipe 12b of the heat exchanger 10 and the other header pipe 32b of the heat exchanger 30 are connected by refrigerant pipes 17b and 37b.
First, when the cooling operation is performed, the heat exchanger 10 functions as a condenser.

The gas refrigerant sent from the compressor 21 of the outdoor unit 20 flows into the header pipe 32a from the refrigerant pipe 37a via the switching valve 22. This gas refrigerant passes through the inside of the header pipe 32a, flows into the refrigerant flow paths 33 in the plurality of flat pipes 31, flows in the horizontal direction (+ x direction), and flows out to the header pipe 32b. The refrigerant flowing out to the header pipe 32b passes through the inside of the header pipe 12b via the refrigerant pipes 17b and 37b, flows into the refrigerant flow paths 13 of the plurality of flat pipes 11, and flows in the horizontal direction (−x direction). The refrigerant dissipates heat and is condensed in the flat tubes 11 and 31 by exchanging heat with the air sent by the blower 24.

The condensed refrigerant flows from the outer pipe 14 of the header pipe 12a having a double pipe structure through the refrigerant hole 15 and into the inner pipe 16, passes through the outdoor expansion valve 23 and the liquid pipe 25 from the refrigerant pipe 17a, and is an indoor unit. Is leaked to.

The condensed refrigerant flowing into the indoor unit absorbs heat and evaporates by exchanging heat with air in an indoor heat exchanger (not shown). The evaporated refrigerant passes through the gas pipe 26 and circulates to the compressor 21 via the switching valve 22. When performing a heating operation, the heat exchanger 10 functions as an evaporator.

The gas refrigerant sent from the compressor 21 of the outdoor unit 20 passes through the gas pipe 26 via the switching valve 22 and flows out to the indoor unit. The gas refrigerant flowing into the indoor unit dissipates heat and condenses by exchanging heat with air in the indoor heat exchanger provided in the indoor unit. The condensed refrigerant passes through the liquid pipe 25 and the outdoor expansion valve 23 to become a gas-liquid two-phase refrigerant, and flows from the refrigerant pipe 17a into the inner pipe 16 of the header pipe 12a having a double pipe structure.

The gas-liquid two-phase refrigerant passes through the refrigerant holes 15 of the inner pipe 16 of the header pipe 12a, flows into the refrigerant flow paths 13 in the plurality of flat pipes 11, flows in the horizontal direction (+ x direction), and flows out to the header pipe 12b. do. The refrigerant flowing out to the header pipe 12b passes through the inside of the header pipe 32b via the refrigerant pipes 17b and 37b, flows into the refrigerant flow paths 33 of the plurality of flat pipes 31, and flows in the horizontal direction (−x direction). The refrigerant absorbs heat and evaporates in the flat tubes 11 and 31 by exchanging heat with the air sent by the blower 24.

The evaporated refrigerant flows into the header pipe 32a, passes through the inside, and circulates from the refrigerant pipe 37a to the compressor 21 via the switching valve 22.

When functioning as an evaporator, a gas-liquid two-phase refrigerant flows through the inner pipe 16 of the header pipe 12a, and a gas-liquid two-phase refrigerant is blown out from the refrigerant hole 15. Of the gas-liquid two-phase refrigerant blown out from the refrigerant hole 15, the liquid refrigerant having a high density has a large inertial force and easily goes straight, and the gas refrigerant lighter than the liquid refrigerant easily diffuses. There is a highly moist (high liquid concentration) refrigerant, and the highly moist refrigerant flows through the refrigerant flow path 13 of the flat tube 11 near the refrigerant hole 15, and the liquid concentration in the space away from the refrigerant hole 15. There is a refrigerant having a low degree of wetness (high gas concentration), and the refrigerant having a low degree of wetness flows through the refrigerant flow path 13 of the flat tube 11 far from the refrigerant hole 15.

The refrigerant hole 15 passes through the central portion of the width of the flat tube 11 in the longitudinal direction (y direction), and the upstream side of the air flow is the downstream side of the air flow with reference to the central surface parallel to the gravity direction (z direction). Because it is wider than the above, it is easy to blow out a highly moist refrigerant to the front of the refrigerant flow path 13 of the flat tube 11 on the upstream side of the air flow, and the degree of wetness to the refrigerant flow path 13 of the flat tube 11 on the upstream side of the air flow. Higher refrigerant flows more easily, and less wet refrigerant flows more easily into the refrigerant flow path 13 of the flat tube 11 on the downstream side of the air flow.

As described above, in the present embodiment, in the heat exchanger 10, a flat pipe 11 having a plurality of refrigerant flow paths 13 and a plurality of flat pipes 11 are installed in the horizontal direction, and both ends of the flat pipe 11 are respectively installed. A pair of header pipes 12 to be connected are provided, and a plurality of flat pipes 11 are connected in parallel to each other along the axial direction of the header pipe 12.

At least one header pipe 12a is provided with an outer pipe 14 for connecting a plurality of flat pipes 11, and an inner pipe 16 having a plurality of refrigerant holes 15 for discharging refrigerant to the flat pipes on the side surfaces of the flat pipes on the connecting side. The refrigerant hole 15 has a double pipe structure composed of, passes through the central portion of the width of the flat pipe 11 in the longitudinal direction (y direction), and has an air flow with reference to a central surface parallel to the gravity direction (z direction). The upstream side is wider than the downstream side of the air flow.

As a result, it becomes easy to blow out a highly moist refrigerant from the inner pipe 16 to the front of the refrigerant flow path 13 of the flat pipe 11 on the upstream side of the air flow having a high heat transfer coefficient, so that the flat pipe on the upstream side of the air flow can be easily blown out. A highly moist refrigerant easily flows through the refrigerant flow path 13 of 11. Highly moist refrigerant flows through the flow path that easily evaporates, and low-humidity refrigerant that stays in the outer pipe 14 flows through the flow path of the flat pipe on the downstream side of the air flow that does not easily evaporate. Since the position where the refrigerant completes evaporation can be made uniform in the refrigerant flow path 13, the flat tube 11 can be effectively used and the heat exchanger performance can be improved.

In the embodiment, two heat exchangers 10 are installed in the air flow direction (y direction), but for example, one or three or more heat exchangers 10 may be installed, and a partition may be provided in the header pipe 12 depending on the situation. A plate is provided, and one header pipe 12a has a double pipe structure on the lower side in the gravity direction (z direction) and a single pipe on the upper side in the gravity direction (z direction). Needless to say, the same effect can be obtained even when connected to the header pipe 12a or when two heat exchangers 10 are stacked in the gravity direction (z direction).
(Embodiment 2)
FIG. 9 is a cross-sectional view of the xy plane of the header pipe according to the second embodiment of the present invention, and FIG. 10 shows the y of the flat tube in the heat exchanger using the header pipe according to the second embodiment of the present invention. It is sectional drawing of the −z plane.

As shown in FIGS. 9 and 10, the central axis C of the inner pipe 16 passes through the central portion of the width in the longitudinal direction of the flat pipe 11 and is on the upstream side of the air flow from the central plane parallel to the gravity direction (z direction). The refrigerant hole 15 is eccentric so that the line connecting the refrigerant hole 15 and the central axis C of the inner pipe 16 is parallel to the flow direction (x direction) of the refrigerant flow path 13 of the flat pipe 11. Is provided.

As a result, the gas-liquid two-phase refrigerant is blown out from the refrigerant hole 15 so as to go straight toward the refrigerant flow path 13 on the upstream side of the air flow, and the refrigerant reaches the wall separating the refrigerant flow path 13 and the refrigerant flow path 13. Since collision is suppressed and the refrigerant is agitated, the flow velocity of the refrigerant is high and the refrigerant is easily agitated. Even during high-capacity operation, the refrigerant is blown out from the inner pipe 16 to the refrigerant flow path 13 on the upstream side of the air flow. The highly moist refrigerant in the as-is state easily flows to the refrigerant flow path 13 on the downstream side of the air flow, and the low-humidity refrigerant staying in the outer pipe 14 easily flows, and the refrigerant flows in each refrigerant flow path 13. The position where the evaporation is completed can be made uniform.

Further, since it is suppressed that the refrigerant collides with the wall separating the refrigerant flow path 13 and the refrigerant flow path 13 and becomes a flow resistance, the blown-out gas-liquid two-phase refrigerant smoothly flows into the refrigerant flow path 13. It is possible to prevent the gas-liquid distribution in the gravity direction (z direction) from becoming uneven due to the liquid refrigerant remaining on the lower side inside the outer pipe 14, and to make the state of the refrigerant flowing to each flat pipe 11 uniform. Can be done.

Further, by flowing a highly moist refrigerant through the refrigerant flow path 13 of the flat pipe 11 on the upstream side of the air flow, where the refrigerant evaporates and the refrigerating machine oil circulating together tends to remain, it remains together with the liquid refrigerant. Since the refined refrigerating machine oil can be returned, the inhibition of heat exchange due to the residual refrigerating machine oil can be suppressed, and the heat exchanger performance can be improved.

The refrigerant hole 15 provided in the inner pipe 16 is on the side surface of the inner pipe 16 that intersects the line connecting the central axis C of the inner pipe 16 and one end of the width in the longitudinal direction (y direction) of the flat pipe 11. Flatness of the point D, the central axis C of the inner pipe 16, and the other end of the width of the flat pipe 11 in the longitudinal direction (y direction), and the point E on the side surface of the inner pipe 16 intersecting the line connecting the points D. It is preferable to provide it so as to be located on the side surface between the connecting sides of the pipe 11.

As a result, the refrigerant is blown from the inner pipe 16 toward the flat pipe 11. The refrigerant collides with the outer pipe 14, becomes a flow resistance, makes it difficult for the refrigerant to flow into the refrigerant flow path 13, and suppresses the liquid refrigerant from remaining in the outer pipe 14, so that the air in the gravity direction (z direction) It is possible to prevent the liquid distribution from becoming non-uniform, and it is possible to further make the state of the refrigerant flowing through each flat tube 11 more uniform.

According to the present invention, in a heat exchanger using a flat tube, it is possible to suppress the flow of different refrigerant states in each of a plurality of refrigerant flow paths, and to make the position where the refrigerant completes evaporation in each refrigerant flow path uniform. It is a heat exchanger / refrigerant, and can be applied to applications such as refrigerators, air conditioners, and hot water supply / air conditioning combined devices.

1 Heat exchanger 2 Coolant flow path 3 Flat pipe 4 Header pipe 5 Outer pipe 6 Refrigerator hole 7 Inner pipe 10, 30 Heat exchanger 11, 31 Flat pipe 12, 32 Header pipe 13, 33 Coolant flow path 14 Outer pipe 15 Refrigerator Hole 16 Inner pipe 17, 37 Coolant pipe 20 Outdoor unit 21 Compressor 22 Switching valve 23 Outdoor expansion valve 24 Blower 25 Liquid pipe 26 Gas pipe

Claims (3)

A flat tube with multiple refrigerant channels and
A pair of header pipes connecting both ends of the flat pipe,
In a heat exchanger provided with, at least one of the header pipes is attached to an outer pipe connecting a plurality of the flat pipes.
The cold Nakadachiana you outflow refrigerant into the flat tube, and the inner tube is provided on the side of the connection direction of the flat tube, in a configured double-pipe structure,
A heat exchanger shunt characterized in that the central axis of the inner pipe passes through the central portion of the width in the longitudinal direction of the flat pipe and is eccentric to the upstream side of the air flow from the central surface parallel to the direction of gravity. The first aspect of claim 1 is characterized in that the refrigerant hole is provided so that the line connecting the refrigerant hole and the central axis of the inner pipe is parallel to the flow direction of the refrigerant flow path of the flat pipe. The heat exchanger shunt described. A point on the side surface of the inner tube that intersects the line connecting the central axis of the inner tube and one end of the width in the longitudinal direction of the flat tube, the central axis of the inner tube, and the longitudinal direction of the flat tube. The claim is characterized in that the refrigerant hole is provided so as to be located on the side surface between the other end of the width and the point on the side surface of the inner pipe that intersects the line connecting the flat pipes. The heat exchanger diversion device according to 1.

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