JP7170881B2 - Heat exchanger and air conditioner using the same - Google Patents

Description

The present invention relates to a heat exchanger and an air conditioner using the same.

In air conditioners, in order to reduce the size and improve the performance of outdoor units, the heat transfer tubes in the heat exchangers used in air conditioners are flat tubes with a multi-hole structure that are superior in heat transfer performance to cylindrical tubes. tend to use. As a heat exchanger using such flat tubes, there is known a fin-and-tube heat exchanger configured by combining fins formed into strips and flat tubes (for example, patent Reference 1).

The heat exchanger disclosed in Patent Document 1 includes a flat tube in which a refrigerant flow path is divided by a plurality of partition walls, a circular tube having a circular cross section, and a plurality of fins joined to the flat tube. and In this heat exchanger, at a connection portion between a U-bend tube or a distributor formed by bending a circular tube into a U shape and the flat tube, the flat tube is connected to the flat tube. Flat pipe fittings are used to convert flat pipes into circular pipes.

A flat pipe joint is a joint that connects a circular pipe and a flat pipe, and has an insertion port corresponding to the flat pipe on one end side and an insertion port corresponding to the circular pipe on the other end side. Depending on the aspect ratio of a flat tube having a flat shape and a multi-hole tube structure, it may be difficult to form an integrated joint. Therefore, the flat joint is composed of two joint members of the same shape that are divided along the vertical cross section, and a relief portion is formed in the deep part of the insertion port of the flat pipe. In the flat joint having such a configuration, the circular pipe and the flat pipe are joined between the two split joint members by brazing in a state in which they are interposed in their respective insertion openings. and connect the circular tube and the flat tube.

JP 2016-38141 A

However, in the heat exchanger of Patent Literature 1, the brazing portion of the flat tube in the flat joint is brazed by surface contact. In particular, with flat joints, it is difficult to predict how the molten brazing filler metal will flow along the inner wall of the flat joint due to the influence of the clearance when the joint members are combined.

In addition, if a sufficient amount of brazing material is not supplied to the joint surface, which is a brazing location where brazing material is required during brazing, voids may occur anywhere on the joint surface. These voids are cavities containing foreign matter such as air, flux or gas generated from the brazing filler metal, residual flux, or oxides. Therefore, in the heat exchanger of Patent Document 1, there is a possibility that a sufficient amount of brazing material cannot be spread over the joint surface of the flat joint, and voids may occur due to insufficient brazing material.

The present invention is intended to solve the above-mentioned problems, and it is possible to sufficiently spread the brazing material on the joint surface where the brazing material is required at the time of brazing, and to prevent the occurrence of voids due to insufficient supply of the brazing material. An object of the present invention is to provide a heat exchanger capable of suppressing heat generation and an air conditioner using the same.

A heat exchanger according to the present invention includes a flat tube that is a heat transfer tube with a flat cross section, a circular tube with a circular cross section, and a flat joint that connects the circular tube and the flat tube. wherein the flat joint has at least two joint members divided by a vertical cross section along the long side of the flat tube at the axial center of the flat tube, and the two joints The flat tube and the circular tube are joined by brazing with the flat tube and the circular tube interposed between members, and a first insertion opening corresponding to the flat tube is formed on one end side, and the other end is A second insertion port corresponding to the circular tube is formed on the side of the joint member, and the brazing portion of the flat tube on the side of the first insertion port of at least one of the two joint members includes the brazing part. A brazing filler metal reservoir is formed to collect the brazing filler metal melted at the time of attachment, and the brazing filler metal reservoir has a distance of It is arranged at a position shorter than the distance from the end of the flat tube inserted into the first insertion port to the brazing filler metal reservoir , and is formed of a recess opening toward the flat tube. The recess is formed as a groove arranged linearly continuously in parallel with the opening of the first insertion port and the long side of the flat shape of the flat tube. be.

Moreover, the air conditioner which concerns on this invention is an air conditioner provided with the heat exchanger, Comprising: The said heat exchanger is used as said heat exchanger.

According to the heat exchanger and the air conditioner using the same according to the present invention, by collecting the brazing filler metal in the brazing filler metal reservoir provided at the brazing location of the flat joint, joints requiring a brazing filler filler during brazing The brazing material can be sufficiently spread over the surface, and the shortage of the brazing material can be avoided to suppress the generation of voids.

2 is a schematic diagram showing a refrigerant circuit of the air conditioner according to Embodiment 1. FIG. FIG. 2 is a perspective view showing the appearance of an outdoor unit in the air conditioner of FIG. 1; FIG. 3 is an exploded perspective view showing the configuration of the outdoor unit of FIG. 2; FIG. 3 is a perspective view showing the configuration of a heat exchanger used in the outdoor unit of FIG. 2; FIG. 5 is an enlarged perspective view showing a main part of the heat exchanger of FIG. 4; FIG. 6 is a perspective view showing the configuration of a flat joint in the heat exchanger of FIG. 5; FIG. 7 is a perspective view showing the configuration of a joint member in the flat joint of FIG. 6; FIG. 8 is a perspective view showing a configuration of a modified example of the joint member of FIG. 7; FIG. 8 is a perspective view showing a configuration of a modified example of the joint member of FIG. 7; FIG. 8 is a perspective view showing a configuration of a modified example of the joint member of FIG. 7; FIG. 8 is a perspective view showing a configuration of a modified example of the joint member of FIG. 7; FIG. 10 is a perspective view showing the configuration of a joint member in a flat joint of a heat exchanger according to Embodiment 2; FIG. 13 is a perspective view showing a configuration of a modified example of the joint member of FIG. 12; FIG. 13 is a perspective view showing a configuration of a modified example of the joint member of FIG. 12;

EMBODIMENT OF THE INVENTION Hereinafter, based on drawing, embodiment at the time of applying the heat exchanger which concerns on this invention, and the same to an air conditioner is described. It should be noted that the forms of the constituent elements shown in the entire specification are merely examples and are not limited to these descriptions. In other words, the present invention can be modified as appropriate within a range not contrary to the gist or idea of the invention that can be read from the scope of claims and the entire specification. Further, the technical idea of the present invention also includes a heat exchanger with such changes and an air conditioner using the same. Furthermore, in each figure, the same reference numerals are the same or equivalent, and this is common throughout the specification.

Embodiment 1.
<Configuration of air conditioner 1>
An air conditioner 1 according to Embodiment 1 will be described with reference to FIG. FIG. 1 is a schematic diagram showing a refrigerant circuit 5 of an air conditioner 1 according to Embodiment 1. FIG.

As shown in FIG. 1, the air conditioner 1 according to Embodiment 1 performs cooling or heating operation by transferring heat between the outside air and the indoor air via the refrigerant, thereby It is for harmonization and has an indoor unit 2 and an outdoor unit 3 .

In the air conditioner 1, the indoor unit 2 and the outdoor unit 3 are pipe-connected via refrigerant pipes 4, 4a, and 4b to form a refrigerant circuit 5 in which the refrigerant circulates. The refrigerant circuit 5 is provided with a compressor 10, a flow path switching device 11, a heat exchanger 12, an expansion valve 13, and an indoor heat exchanger 14, which are connected via refrigerant pipes 4, 4a, and 4b. .

The outdoor unit 3 has a compressor 10 , a flow switching device 11 , a heat exchanger 12 and an expansion valve 13 . The compressor 10 compresses and discharges the sucked refrigerant. Here, the compressor 10 may include an inverter device (not shown). When an inverter device is provided, the capacity of the compressor 10 can be changed by changing the operating frequency with the control unit 6 . Note that the capacity of the compressor 10 is the amount of refrigerant sent out per unit time.

The channel switching device 11 is, for example, a four-way valve, and is a device that switches the direction of the coolant channel. The air conditioner 1 can realize heating operation or cooling operation by switching the refrigerant flow using the flow path switching device 11 based on an instruction from the control unit 6 . The heat exchanger 12 exchanges heat between the refrigerant and the outdoor air. Further, the heat exchanger 12 is provided with an outdoor fan 15 in order to increase the efficiency of heat exchange between the refrigerant and the outdoor air. An inverter device (not shown) may be attached to the outdoor fan 15 . In this case, the inverter device changes the operating frequency of the fan motor 16, which is the driving source of the outdoor fan 15, to change the rotation speed of the fan. The outdoor blower 15 is not limited to this as long as the same effect can be obtained. For example, the type of the fan may be a sirocco fan or a plug fan. Further, the outdoor blower 15 may be of a pushing type or a pulling type.

Here, the heat exchanger 12 functions as an evaporator during heating operation, and performs heat exchange between the low-pressure refrigerant flowing from the refrigerant pipe 4b side and the outdoor air to evaporate the refrigerant. , to the refrigerant pipe 4a side. In addition, the heat exchanger 12 functions as a condenser during cooling operation, and between the refrigerant that has been compressed by the compressor 10 that has flowed in from the refrigerant pipe 4a side via the flow path switching device 11 and the outdoor air. , the refrigerant is condensed and liquefied, and flowed out to the refrigerant pipe 4b side. Although the case where outdoor air is used as the external fluid has been described here as an example, the external fluid is not limited to gas containing outdoor air, and may be liquid containing water.

The expansion valve 13 is a throttle device that controls the flow rate of the refrigerant, and adjusts the pressure of the refrigerant by adjusting the flow rate of the refrigerant flowing through the refrigerant pipe 4 by changing the degree of opening of the expansion valve 13 . The expansion valve 13 expands the high-pressure liquid state refrigerant to the low-pressure gas-liquid two-phase state refrigerant to reduce the pressure during the cooling operation. The expansion valve 13 is not limited to this, and may be an electronic expansion valve, a capillary tube, or the like as long as the same effect can be obtained. For example, if the expansion valve 13 is an electronic expansion valve, the degree of opening is adjusted based on instructions from the controller 6 .

The indoor unit 2 includes an indoor heat exchanger 14 that exchanges heat between a refrigerant and indoor air, and an indoor fan 17 that adjusts the flow of the air with which the indoor heat exchanger 14 exchanges heat.

The indoor heat exchanger 14 functions as a condenser during heating operation, performs heat exchange between the refrigerant flowing from the refrigerant pipe 4a side and the indoor air, condenses and liquefies the refrigerant, and the refrigerant pipe It is made to flow out to the 4b side. In addition, the indoor heat exchanger 14 functions as an evaporator during cooling operation, and performs heat exchange between the refrigerant brought into a low pressure state by the expansion valve 13 flowing from the refrigerant pipe 4b side and the indoor air, The refrigerant takes the heat of the air, evaporates, and flows out to the refrigerant pipe 4a side. Although the case where indoor air is used as the external fluid has been described as an example, the external fluid is not limited to gas containing indoor air, and may be liquid containing water.

The operating speed of the indoor fan 17 is determined by user settings. It is preferable to attach an inverter device to the indoor fan 17 and change the operating frequency of the fan motor 18 to change the rotational speed of the fan. The indoor blower 17 is not limited to this as long as the same effect can be obtained. For example, the type of the fan may be a sirocco fan or a plug fan. Further, the indoor blower 17 may be of a pushing type or a pulling type.

<Example of Cooling and Heating Operation of Air Conditioner 1>
Next, the operation of the cooling operation will be described as an example of the operation of the air conditioner 1. FIG. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 10 flows into the heat exchanger 12 via the flow switching device 11 . The gas refrigerant that has flowed into the heat exchanger 12 is condensed by heat exchange with the outside air blown by the outdoor fan 15 , becomes low-temperature refrigerant, and flows out of the heat exchanger 12 . The refrigerant flowing out of the heat exchanger 12 is expanded and decompressed by the expansion valve 13 to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the indoor heat exchanger 14 of the indoor unit 2, evaporates by heat exchange with the indoor air blown by the indoor fan 17, and becomes a low-temperature, low-pressure gas refrigerant in the indoor heat exchanger. It flows out from 14. At this time, the indoor air that has been cooled by absorbing heat by the refrigerant becomes conditioned air (blowing air), and is blown out from the indoor unit 2 into the room that is the space to be air-conditioned. The gas refrigerant that has flowed out of the indoor heat exchanger 14 is sucked into the compressor 10 via the flow switching device 11 and compressed again. In the cooling operation of the air conditioner 1, the above operations are repeated (indicated by solid arrows in FIG. 1).

Next, the operation of the heating operation will be described as an example of the operation of the air conditioner 1. FIG. The high-temperature and high-pressure gas refrigerant compressed and discharged by the compressor 10 flows into the indoor heat exchanger 14 of the indoor unit 2 via the flow switching device 11 . The gas refrigerant that has flowed into the indoor heat exchanger 14 is condensed by heat exchange with indoor air blown by the indoor blower 17 , becomes a low-temperature refrigerant, and flows out of the indoor heat exchanger 14 . At this time, the indoor air heated by receiving heat from the gas refrigerant becomes conditioned air (blowing air) and is blown out from the indoor unit 2 into the room. The refrigerant flowing out of the indoor heat exchanger 14 is expanded and decompressed by the expansion valve 13 to become a low-temperature, low-pressure gas-liquid two-phase refrigerant. This gas-liquid two-phase refrigerant flows into the heat exchanger 12 of the outdoor unit 3, evaporates by heat exchange with the outside air blown by the outdoor fan 15, becomes a low-temperature low-pressure gas refrigerant, and flows out of the heat exchanger 12. do. The gas refrigerant that has flowed out of the heat exchanger 12 is sucked into the compressor 10 via the flow switching device 11 and compressed again. In the heating operation of the air conditioner 1, the above operations are repeated (indicated by the dashed arrow in FIG. 1).

<Outdoor unit 3>
Here, the outdoor unit 3 of the air conditioner 1 according to Embodiment 1 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a perspective view showing the appearance of the outdoor unit 3 in the air conditioner 1 of FIG. 3 is an exploded perspective view showing the configuration of the outdoor unit 3 of FIG. 2. FIG.

As shown in FIGS. 2 and 3, the outdoor unit 3 has a housing panel 30 that covers the outer shell and is formed in a rectangular parallelepiped shape. The interior of the housing panel 30 is partitioned into an air passage chamber 32 and a machine chamber 33 by a partition plate 31 . An outdoor fan 15 is installed on the front side of the housing panel 30 in the air passage chamber 32 . The heat exchanger 12 is mounted in an L-shape from the back side to the side side of the air passage chamber 32 of the housing panel 30 on the back side of the outdoor fan 15 in the air passage chamber 32 .

The housing panel 30 includes an upper front panel 30a, a lower front panel 30b, an upper rear panel 30c, a lower rear panel 30d, a top panel 30e, a side panel 30f, and a front panel 30g. In addition, the housing panel 30 surrounds the four side surfaces of the air passage chamber 32 and the four side surfaces of the machine chamber 33 together with the partition plate 31 . Note that the configuration of the housing panel 30 of the machine room 33 described above is an example, and the number of parts of the housing panel 30, the positions of joints, and the like are not limited. For example, the outdoor unit 3 may use a front outer panel in which the upper front outer panel 30a and the lower front outer panel 30b are integrated.

The outdoor blower 15 is provided with a plurality of blades 15b on the outer circumference of a boss 15a serving as the center of rotation, and is rotationally driven by a fan motor 16 (see FIG. 1). A front panel 30g located on the front side of the outdoor fan 15 in the housing panel 30 has a slit-shaped outlet 30h for discharging the air inside the housing panel 30 to the outside of the housing panel 30. is provided.

Installed in the machine room 33 is a compressor 10 that is connected to the heat exchanger 12 via a refrigerant pipe 4 (see FIG. 1) and that supplies refrigerant to the heat exchanger 12 . The compressor 10 may be provided with a thermal protector that functions as an overheat protection device that detects the surface temperature of the compressor 10 . In the machine room 33, electrical components such as a current sensor for detecting whether the outdoor unit 3 is in operation, a power module, an inverter board, etc. are installed.

<Heat exchanger 12>
Next, the heat exchanger 12 according to Embodiment 1 will be described with reference to FIGS. 4 to 11. FIG. FIG. 4 is a perspective view showing the configuration of the heat exchanger 12 used in the outdoor unit 3 of FIG. FIG. 5 is a perspective view showing an enlarged main part of the heat exchanger 12 of FIG. 6 is a perspective view showing the configuration of the flat joint 20 in the heat exchanger 12 of FIG. 5. FIG. FIG. 7 is a perspective view showing the configuration of the joint member 21 in the flat joint 20 of FIG. FIG. 8 is a perspective view showing a configuration of a modification of the joint member 21 of FIG. FIG. 9 is a perspective view showing a configuration of a modified example of the joint member 21 of FIG. FIG. 10 is a perspective view showing a configuration of a modified example of the joint member 21 of FIG. FIG. 11 is a perspective view showing a configuration of a modified example of the joint member 21 of FIG.

In the following description, only one of the joint members 21 and 22 constituting the flat joint 20 is shown in FIGS. 7 to 11, but the other joint member 22 is Since they are configured in the same way, they are omitted for convenience. That is, although the details will be described later, the joint members 21 and 22 forming the flat joint 20 have the same shape. These joint members 21 and 22 face each other and are overlapped and joined together to form the flat joint 20 .

As shown in FIGS. 4 and 5, the heat exchanger 12 has flat tubes 121, which are flat heat transfer tubes through which the refrigerant flows, and the heat transfer area between the refrigerant flowing through the flat tubes 121 and the outside air is increased. It has a structure in which heat exchange bodies 120 having fins 122 for and are provided in parallel. That is, the heat exchanger 12 is configured as a so-called double-row fin-and-tube heat exchanger having two heat exchange elements 120 . In the case of Embodiment 1, the heat exchanger 12 is formed in an L shape as a whole in accordance with the shape of the outdoor unit 3 (see FIGS. 2 and 3) to be mounted.

The fins 122 are shaped like strips, are arranged in a vertically elongated state, and are arranged side by side at intervals in a horizontal direction orthogonal to the vertical direction. The flat tube 121 has a multi-hole tube structure with a flat cross section, is arranged in a state of being extended in the horizontal direction, and is provided by stacking a plurality of tubes vertically with a gap therebetween. These flat tubes 121 are connected to each other in a state of being inserted into and penetrating through the fins 122 . The flat tube 121 and the fins 122 are joined by brazing after assembly. A fin material is a clad material with a braze layer. The fins 122 are clad together with the core material by using an aluminum alloy having a melting point lower than that of the core material as a brazing material layer. After assembly, the flat tube 121 and fins 122 are heated to bond. Alternatively, bare material may be used as the fin material, and the flat tube 121 side may be coated with a brazing material, which may be heated and joined in the same manner. Alternatively, the fin material is a bare material, and the flat tube 121 side is not provided with brazing material. There is also a method of supplying a brazing material and heating it in the same way.

Here, the flat tube 121 has an oval flat shape in a cross section perpendicular to the extension direction, and has an outer shape in which the short sides are arcuate and the long sides are flat. there is Since the flat tube 121 has a multi-hole tube structure, the contact area between the inner surface of the heat transfer tube and the refrigerant is increased compared to a circular heat transfer tube, and thus the heat exchange efficiency is excellent. The material of the flat tube 121 is mainly aluminum or an aluminum alloy, and is formed by a processing method such as extrusion molding or pultrusion molding. The flattened pipe 121 having a flattened cross-section develops pitting corrosion as corrosion progresses. Therefore, it is desirable that a sacrificial anode layer is formed on the outer surface of the flat tube 121 using a method such as zinc thermal spraying in order to prevent leakage of the coolant inside the tube due to pitting corrosion.

In the case of the first embodiment, the heat exchange element 120 arranged on the upstream side of the air supplied from the outdoor fan 15 (see FIG. 3) and the heat exchange element 120 arranged on the downstream side, Each flat tube 121 is staggered so that the flat tubes 121 do not cross the flow. That is, the flat tubes 121 of the heat exchange element 120 on the upstream side and the flat tubes 121 of the heat exchange element 120 on the downstream side are arranged alternately in the vertical direction. As a result, air is uniformly supplied to all the flat tubes 121, thereby preventing deterioration in heat exchange efficiency.

An end portion of a flat tube 121 as a main part of the heat exchanger 12 shown enlarged in FIG. . A distribution circuit such as a distributor 125 and a header 126 is connected to the tip of the circular tube 123 . A distributor 125 distributes the refrigerant to each flat tube 121, and a header 126 has a function of collecting the refrigerant. In addition, the flat tubes 121 of the heat exchange elements 120 on the upstream side and the flat tubes 121 of the heat exchange elements 120 on the downstream side, which are alternately arranged vertically, are connected via U-bend tubes 124 . The U-bend pipe 124 is formed by bending a pipe having a circular cross section into a U-shape.

Here, as shown in FIG. 6, the flat joint 20 has at least two joint members 21 and 22 divided by a vertical cross section along the long side of the flat tube 121 at the axial center of the flat tube 121. Configured. The flat joint 20 has a first insertion port 20a corresponding to the flat tube 121 on one end side, and a second insertion port 20b corresponding to the circular tube 123 on the other end side. It is In the flat joint 20, a flat tube 121 and a circular tube 123 are interposed between two joint members 21 and 22 having the same shape, and these joint members 21 and 22 are placed opposite each other in a monaka shape and stacked. It is formed by fitting and joining by brazing.

The joint member 21 has engaging protrusions 23 and 24 and engaging holes 25 and 26 for alignment when the joint members 21 and 22 are joined at a portion facing the joint member 22. is formed. Although not shown here, the joint member 22 is also configured in the same manner as the joint member 21 . Therefore, when the joint member 21 and the joint member 22 are overlapped so as to face each other, the engagement projection 23 of the joint member 21 and the engagement hole 25 of the joint member 22, the engagement projection 24 of the joint member 21 and the engagement hole 25 of the joint member 22 The engagement hole portion 26 of the joint member 22 is engaged. Similarly, the engagement hole portion 25 of the joint member 21 and the engagement projection portion 23 of the joint member 22 are engaged with the engagement hole portion 26 of the joint member 21 and the engagement projection portion 24 of the joint member 22 . As a result, when the joint member 21 and the joint member 22 are placed facing each other, they can be aligned easily and accurately.

As shown in FIG. 7, in the joint member 21, a brazing material reservoir for collecting the molten brazing material during brazing is provided at the brazing portion, which is the joint surface of the flat tube 121 on the side of the first insertion port 20a. A portion 21a is formed. The joint member 21 and the joint member 22 shown in FIG. 6 have the same shape. It may be provided at the brazing locations of both members 21 and 22 . The brazing filler metal storage portion 21a is formed as a recess opening toward the flat tube 121, and this recess is arranged linearly continuously in parallel with the opening of the first insertion port 20a. It is configured by being formed as a groove portion. At this time, the distance from the opening end of the joint member 21 on the side of the first insertion port 20a of the brazing material storage portion 21a is the distance from the end of the flat tube 121 inserted into the first insertion port 20a. is placed at a position shorter than the distance of

In the brazing filler metal reservoir 21a having such a structure, the brazing filler metal melted during brazing can flow into the brazing filler metal reservoir 21a due to capillary action and stay there. It is possible to pass. Therefore, it is possible to suppress the occurrence of voids due to insufficient supply of the brazing filler metal at the brazing location. By defining the position where the brazing filler metal storage portion 21a is arranged, it is possible to suppress the inflow of the brazing filler metal into the flat tube 121 and prevent clogging with the brazing filler metal.

As a method for forming the brazing material storage portion 21a, it can be formed by forming a concave portion at the time of pressing, or by forming a notch after press forming. Depending on the processing method, the cross-sectional shape of the recess on the surface of the brazed portion can be semicircular, triangular, rectangular, or the like, and a certain effect can be obtained in any configuration.

In addition, the joint member 21 constituting the flat joint 20 is such that the brazing filler metal flows into the flat tube 121 or the circular tube 123 between the first insertion port 20a and the second insertion port 20b. Thus, a relief portion 20c is formed to prevent solder clogging. The relief portion 20c of the flat joint 20 bulges outward more than the first insertion port 20a and the second insertion port 20b. The relief portion 20c is also provided in a joint member 22 (see FIG. 6) having the same shape as the joint member 21. As shown in FIG.

Here, as described above, one or both of the joint members 21 and 22 constituting the flat joint 20 have brazing material reservoirs 21a at their brazing locations relative to the opening of the first insertion port 20a. A case has been described where the grooves are formed as grooves that are arranged in parallel and continuously in a linear fashion. However, the shape and arrangement of the brazing filler metal reservoir 21a are not limited to this. That is, the brazing filler metal storage portion 21a may be formed in a partial concave state or in a linear groove state.

Specifically, the brazing filler metal reservoir 21a is parallel to the opening of the first insertion port 20a and has a linear shape, for example, as shown in FIG. A plurality of grooves may be arranged in parallel with respect to the opening of the first insertion port 20a. As a result, it is possible to form fillets on both sides of the brazing filler metal reservoir 21a, namely, the side in contact with the outside air and the side in contact with the coolant. can do. Therefore, by forming a fillet on the outer side, it is possible to promote improvement in not only pressure resistance but also corrosion or fatigue strength.

Also, as shown in FIG. 9, in which parts corresponding to those in FIG. 7 are denoted by the same reference numerals, the brazing filler metal reservoir 21a is linearly intermittent in parallel with the opening of the first insertion port 20a. Alternatively, the grooves may be formed as grooves arranged in a dashed line. Also in this case, the same effects as in the first embodiment can be obtained.

Further, as shown in FIG. 10, in which parts corresponding to those in FIG. 7 are denoted by the same reference numerals, the brazing filler metal reservoir 21a is parallel to the opening of the first insertion port 20a and spaced on the same line. The grooves may be formed as linear grooves arranged in parallel. As a result, it is possible to concentrate the brazing filler metal in places where it is particularly difficult for the brazing filler metal to spread. In FIG. 10, the brazing material reservoirs 21a are provided at both ends of the brazing part except for the center, but other configurations such as forming the brazing material reservoir 21a only at the central part can also provide a certain effect. be done.

Further, as shown in FIG. 11 in which the same reference numerals are given to the parts corresponding to those in FIG. 7, the brazing filler metal reservoir 21a is formed as a plurality of grooves arranged radially toward the opening of the first insertion port 20a. may be This makes it possible to dispose the solidified brazing filler metal in the coolant flow direction. Therefore, it is possible to form fillets on both sides of the brazing filler metal reservoir 21a, that is, the side that contacts the outside air and the side that contacts the coolant. becomes. FIG. 11 shows a case in which three radial brazing filler metal reservoirs 21a are arranged. can get.

<Effect in Embodiment 1>
As described above, according to the heat exchanger 12 and the air conditioner 1 using the heat exchanger 12 of Embodiment 1, in the flat joint 20 connecting the flat tube 121 and the circular tube 123, the flat shape One or both of the joint members 21 and 22 constituting the joint 20 is provided with a brazing material storage portion 21a. As a result, the brazing material melted during brazing is collected and held in the brazing material reservoir 21a, so that the brazing material can be sufficiently distributed to the brazing locations where the brazing material is required during brazing. It is possible to suppress the generation of voids due to insufficient brazing filler metal supply.

Embodiment 2.
Next, the flat joint 20 of the heat exchanger 12 according to Embodiment 2 will be described with reference to FIGS. 12 to 14. FIG. FIG. 12 is a perspective view showing the configuration of joint member 21 in flat joint 20 of heat exchanger 12 according to the second embodiment. 13 is a perspective view showing a configuration of a modified example of the joint member 21 of FIG. 12. FIG. 14 is a perspective view showing a configuration of a modification of the joint member 21 of FIG. 12. FIG. In the second embodiment, as in the first embodiment described above, only the joint member 21 of the flat joint 20 will be illustrated and explained. For the sake of convenience, it is omitted.

As shown in FIG. 12, in which parts corresponding to those in FIG. Through-holes are formed in the joint member 21 in places. As a result, loopholes are formed for the brazing material melted during brazing and the flux material for activating the action of the brazing material. Therefore, it is possible to remove the flux that is no longer needed after the activation is completed before the brazing filler metal solidifies from the brazing filler metal reservoir 21a formed in the brazing location, and the brazing filler metal also gathers around the through hole. , it is possible to suppress the generation of voids. As a processing method for forming the brazing filler metal storage portion 21a in the form of a through-hole, as in the first embodiment, a hole is formed during pressing, or a hole is formed after pressing.

The number of through-hole-shaped brazing filler metal reservoirs 21a is not limited to one, and a plurality of brazing filler metal reservoirs 21a may be formed at the brazing location. For example, as shown in FIG. 13, in which parts corresponding to those in FIG. good. As a result, the brazing filler metal reservoir 21a, through which the molten brazing filler metal and the flux are released during brazing, can be arranged at a location where the solidified brazing filler metal is required, thereby suppressing the generation of voids.

Further, as shown in FIG. 14, in which parts corresponding to those in FIG. The first insertion port 20a and the centers of the joint members 21 and 22 may be arranged in the same direction and at the same position. In this case, the plurality of brazing filler metal reservoirs 21a are arranged so as to be in staggered positions when the two joint members 21 and 22 are placed facing each other. As a result, the brazing filler metal reservoir 21a as a loophole for the brazing filler metal melted at the time of brazing and the flux material can be disposed without waste at a location where the solidified brazing filler metal is required, thereby further suppressing the generation of voids. becomes possible.

<Effect in Embodiment 2>
As described above, according to the heat exchanger 12 and the air conditioner 1 using the heat exchanger 12 of Embodiment 2, in the flat joint 20 that connects the flat tube 121 and the circular tube 123, the flat shape One or both of the joint members 21 and 22 constituting the joint 20 is provided with a brazing material storage portion 21a as a through-hole. As a result, the brazing filler metal melted at the time of brazing and the flux material can be removed from the brazing portion in the brazing filler metal storage portion 21a, and the solidified brazing filler metal can be disposed without waste at a required portion. Therefore, it is possible to suppress the generation of voids due to insufficient supply of the brazing filler metal.

REFERENCE SIGNS LIST 1 air conditioner 2 indoor unit 3 outdoor unit 4 refrigerant pipe 4a refrigerant pipe 4b refrigerant pipe 5 refrigerant circuit 6 control unit 10 compressor 11 flow switching device 12 heat exchanger 13 expansion valve, 14 indoor heat exchanger, 15 outdoor fan, 15a boss, 15b blade, 16 fan motor, 17 indoor fan, 18 fan motor, 20 flat joint, 20a first insertion port, 20b second insertion port , 20c relief portion, 21 joint member, 21a brazing filler metal storage portion, 22 joint member, 23 engagement projection portion, 24 engagement projection portion, 25 engagement hole portion, 26 engagement hole portion, 30 housing panel, 30a front surface Upper shell panel 30b Front lower shell panel 30c Rear upper shell panel 30d Rear lower shell panel 30e Top shell panel 30f Side shell panel 30g Front panel 30h Air outlet 31 Partition plate 32 Air passage chamber 33 machine room, 120 heat exchanger, 121 flat tube, 122 fin, 123 circular tube, 124 U bend tube, 125 distributor, 126 header.

Claims (4)

A heat exchanger comprising a flat tube that is a heat transfer tube with a flat cross section, a circular tube with a circular cross section, and a flat joint that connects the circular tube and the flat tube,
The flat joint is
having at least two joint members divided in a longitudinal section along the long side of the flat shape at the axial center of the flat tube;
joined by brazing with the flat tube and the circular tube interposed between the two joint members,
A first insertion port corresponding to the flat tube is formed on one end side,
A second insertion opening corresponding to the circular tube is formed on the other end side,
A brazing material reservoir for collecting the brazing material melted during the brazing is formed at the brazing location of the flat tube on the first insertion port side of at least one of the two joint members,
The brazing material reservoir is
The distance from the open end on the first insertion port side to the brazing material reservoir is longer than the distance from the end of the flat tube inserted into the first insertion port to the brazing material reservoir. placed in a short position ,
is formed with a recess opening toward the flat tube,
The recess is
A heat exchanger that is formed as a groove that is linearly continuously arranged in parallel with the opening of the first insertion port and the long side of the flat shape of the flat tube. A heat exchanger comprising a flat tube that is a heat transfer tube with a flat cross section, a circular tube with a circular cross section, and a flat joint that connects the circular tube and the flat tube,
The flat joint is
having at least two joint members divided in a longitudinal section along the long side of the flat shape at the axial center of the flat tube;
joined by brazing with the flat tube and the circular tube interposed between the two joint members,
A first insertion port corresponding to the flat tube is formed on one end side,
A second insertion opening corresponding to the circular tube is formed on the other end side,
A brazing material reservoir for collecting the brazing material melted during the brazing is formed at the brazing location of the flat tube on the first insertion port side of at least one of the two joint members,
The brazing material reservoir is
The distance from the open end on the first insertion port side to the brazing material reservoir is longer than the distance from the end of the flat tube inserted into the first insertion port to the brazing material reservoir. placed in a short position,
is formed with a recess opening toward the flat tube,
The recess is
A heat exchanger that is formed as grooves arranged linearly and intermittently in parallel with the opening of the first insertion port and the long side of the flat shape of the flat tube . The groove is
3. The heat exchanger according to claim 1 , wherein a plurality of heat exchangers are arranged in parallel with respect to the opening of said first receptacle. An air conditioner comprising a heat exchanger,
An air conditioner using the heat exchanger according to any one of claims 1 to 3 as the heat exchanger.

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