JP2023051523A - Air-conditioning indoor unit - Google Patents

Abstract

To suppress crushing of a refrigerant pipe caused by bending work of the refrigerant pipe during installation, in an air-conditioning indoor unit comprising an aluminum refrigerant pipe.SOLUTION: An air-conditioning indoor unit comprises a heat exchanger 20 having an aluminum heat transfer pipe 21, an aluminum refrigerant pipe 30, and a metal first member 50. The aluminum refrigerant pipe 30 is connected to the heat transfer pipe 21, and refrigerant heat-exchanged in the heat exchanger 20 flows therein. The metal first member 50 extends along the surface of the refrigerant pipe 30. The refrigerant pipe 30 has a first portion Pa1 connected to the heat transfer pipe 21, a curved second portion Pa2 connected to the first portion Pa1, and a third portion Pa3 connected to the second portion Pa2 and extending to the end part of the refrigerant pipe 30. The first member 50 covers the second portion Pa2.SELECTED DRAWING: Figure 2

Description

The present invention relates to an air conditioner indoor unit having an aluminum heat transfer tube in a heat exchanger.

The air conditioner indoor unit includes a heat exchanger that exchanges heat of refrigerant. An air conditioner indoor unit, for example, is connected to an outdoor unit to form an air conditioner. In order to circulate a refrigerant between the air conditioner indoor unit and the outdoor unit, the air conditioner indoor unit and the outdoor unit are connected by a connecting pipe. When installing the air conditioning indoor unit, in order to facilitate the connection work between the connecting pipe and the air conditioning indoor unit, the air conditioning indoor unit has a heat transfer pipe of the heat exchanger inside the air conditioning indoor unit and a connecting pipe to assist the connection. Refrigerant piping is provided.

For the purpose of reducing the weight and cost of the air conditioner indoor unit, as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-140998), many heat transfer tubes and refrigerant pipes of the heat exchanger of the air conditioner indoor unit. Aluminum or aluminum alloys have replaced the material in parts or in whole.

In order to properly connect the refrigerant pipes and the heat transfer pipes of the heat exchanger when installing the air conditioning indoor unit, the refrigerant piping of the air conditioning indoor unit should be arranged according to the relationship between the installation position of the air conditioning indoor unit and the installation position of the connecting pipe. bendable. Refrigerant piping may be bent multiple times for proper alignment during installation of the air conditioner indoor unit. When the number of times that the aluminum refrigerant pipe is bent increases, it is likely to be crushed and deformed from a circular ring shape to a flat shape in cross section.

An air conditioner indoor unit having such an aluminum refrigerant pipe has a problem of suppressing crushing of the refrigerant pipe due to bending work of the refrigerant pipe during installation.

An air conditioner indoor unit according to a first aspect includes a heat exchanger having an aluminum heat transfer tube, an aluminum refrigerant pipe, and a metal first member. Refrigerant pipes made of aluminum are connected to the heat transfer tubes, and the refrigerant that undergoes heat exchange in the heat exchanger flows. A metal first member extends along the surface of the refrigerant pipe. The refrigerant pipe has a first portion connected to the heat transfer pipe, a second portion connected to the first portion and bent, and a third portion connected to the second portion and extending to the end of the refrigerant pipe. and the first member surrounds the second portion.

In the air conditioning indoor unit of the first aspect, the first member prevents the second portion of the refrigerant pipe from being deformed into a shape other than a circular cross section. It is possible to prevent the parts from collapsing.

The air conditioner indoor unit of the second aspect is the air conditioner indoor unit of the first aspect, wherein the first member includes a ring portion arranged on the second portion. The first member has an expansion/contraction structure in which the ring portion can expand and contract while maintaining a ring shape.

In the air conditioning indoor unit of the second aspect, since the plurality of ring portions maintains the ring shape even after the first member expands and contracts, the handling of the first member and the refrigerant pipe during work to bend the refrigerant pipe becomes easy. The workability of installing the indoor unit can be improved.

An air conditioner indoor unit according to a third aspect is the air conditioner indoor unit according to the first aspect or the second aspect, wherein the first member is made of a metal having a nobler potential than aluminum. The first member or the second portion is coated with an anti-galvanic corrosion coating or an insulating member.

In the air conditioner indoor unit of the third aspect, the electrolytic corrosion between the first member made of a metal having a potential higher than that of aluminum and the aluminum refrigerant pipe can be prevented by the electrolytic corrosion prevention coating or the insulating member.

An air conditioner indoor unit according to a fourth aspect is the air conditioner indoor unit according to any one of the first aspect to the third aspect, wherein the first member is made of stainless steel or aluminum.

In the air conditioner indoor unit of the fourth aspect, since the first member is made of stainless steel or aluminum, electrical decoration is less likely to occur between the aluminum refrigerant pipe and the first member, and the refrigerant pipe is prevented from corroding due to electric corrosion. can be suppressed.

An air conditioning indoor unit according to a fifth aspect is the air conditioning indoor unit according to any one of the first aspect to the fourth aspect, wherein the refrigerant pipe is a liquid pipe and a gas pipe through which a refrigerant containing more gas components than the liquid pipe flows. including. The first member is arranged only on the gas pipe.

In the air conditioner indoor unit of the fifth aspect, since the liquid pipe is thinner than the gas pipe and is less likely to be crushed, by arranging the first member only in the gas pipe, it is possible to prevent the refrigerant pipe from being crushed and reduce the number of parts. can be done.

An air conditioner indoor unit according to a sixth aspect is the air conditioner indoor unit according to any one of the first aspect to the fifth aspect, wherein the difference between the inner diameter of the first member and the outer diameter of the second portion is 0.1 mm or more and 0.1 mm or more. 7 mm or less.

In the air conditioning indoor unit of the sixth aspect, by setting the difference between the inner diameter of the first member and the outer diameter of the second portion to 0.7 mm or less, the refrigerant pipe can be regulated to be less deformed when it is bent. It is possible to effectively prevent the pipe from being crushed. Further, by setting the difference to 0.1 mm or more, it becomes easier to fit the first member into the refrigerant pipe compared to the case where the difference is less than 0.1 mm.

An air conditioner indoor unit according to a seventh aspect is the air conditioner indoor unit according to any one of the first aspect to the sixth aspect, wherein the third portion of the refrigerant pipe is a straight pipe. The first member covers over half or more of the third portion in the longitudinal direction.

In the air conditioner indoor unit of the seventh aspect, since the third portion covers more than half in the longitudinal direction, even when the third portion is bent during installation, the portion covered by the first member is can be used and can prevent the third portion from collapsing.

An air conditioner indoor unit according to an eighth aspect is the air conditioner indoor unit according to any one of the first aspect to the seventh aspect, and includes a connecting portion for connecting to a communication pipe for communication with an outdoor unit arranged outdoors. ing. The third portion is indirectly connected to the connecting portion directly or via another member.

In the air conditioner indoor unit of the eighth aspect, the connection portion can prevent the first member from falling out of the refrigerant pipe during work or the like.

Fig. 2 is a schematic cross-sectional view of an air conditioner indoor unit included in the air conditioner; Fig. 3 is a front view of a heat exchanger of the air conditioner indoor unit; It is a perspective view which shows the back side of an air-conditioning indoor unit. It is a rear view of an air-conditioning indoor unit. Fig. 3 is a side view of the air conditioning indoor unit with the refrigerant pipe 30 and the drain hose 35 extended to the back side; It is a side view of a coil spring. It is a front view of a coil spring. It is a side view of the accordion-shaped 1st member. It is a front view of a bellows-shaped first member. It is a perspective view of a net-like 1st member. Fig. 10 is a perspective view of the first member with a cut;

(1) Overall Configuration The air conditioner indoor unit 10 shown in FIG. 1 is connected to the outdoor unit 70 to form the air conditioner 100 . Heat is transferred between the air conditioning indoor unit 10 and the outdoor unit 70 of the air conditioner 100 by using a phase change of the refrigerant in a vapor compression refrigeration cycle. The air conditioner indoor unit 10 includes a heat exchanger 20 for heat exchange between refrigerant and indoor air. The outdoor unit 70 includes, for example, an outdoor heat exchanger (not shown) that exchanges heat between the outside air and the refrigerant in order to take in heat from the outside air to the refrigerant or release heat from the refrigerant to the outside air. The outdoor unit 70 is installed, for example, in an outdoor OD.

When the air conditioner 100 cools the room, in the heat exchanger 20 of the air conditioner indoor unit 10, the refrigerant takes heat from the air in the room through heat exchange, and the temperature of the air in the room drops. The refrigerant whose temperature has risen by absorbing heat in the heat exchanger 20 of the air conditioner indoor unit 10 flows to the outdoor unit 70 . In the outdoor unit 70, the heat of the refrigerant whose temperature has risen is released to the outside air, and the temperature of the refrigerant decreases. The refrigerant whose temperature has decreased in the outdoor unit 70 flows to the heat exchanger 20 of the air conditioning indoor unit 10, and takes heat from the indoor air in the heat exchanger 20 again.

When the air conditioner 100 heats the room, in the heat exchanger 20 of the air conditioner indoor unit 10, the refrigerant gives heat to the air in the room by heat exchange, and the temperature of the air in the room rises. The refrigerant whose temperature has been lowered by giving heat in the heat exchanger 20 of the air conditioning indoor unit 10 flows to the outdoor unit 70 . In the outdoor unit 70, the coolant whose temperature has decreased takes heat from the outside air, and the temperature of the coolant rises. The refrigerant whose temperature has risen in the outdoor unit 70 flows to the heat exchanger 20 of the air conditioning indoor unit 10 and gives heat to the indoor air in the heat exchanger 20 again.

The air conditioner indoor unit 10 and the outdoor unit 70 are connected by a communication pipe 80 for communication. The communication pipe 80 includes a first communication pipe 81 and a second communication pipe 82 for flowing the refrigerant circulating between the air conditioner indoor unit 10 and the outdoor unit 70 . The first communication pipe 81 is a pipe for communicating between the connecting portion 71 of the outdoor unit 70 and the first connecting portion 41 of the air conditioning indoor unit 10 to flow the refrigerant. The second communication pipe 82 is a pipe for communicating between the connecting portion 72 of the outdoor unit 70 and the second connecting portion 42 of the air conditioning indoor unit 10 to flow the refrigerant. The first connection portion 41 and the second connection portion 42 are included in the connection portion 40 of the air conditioner indoor unit 10 . The connecting pipe 80 may have a cover for covering the first connecting pipe 81 and the second connecting pipe 82 and protecting the first connecting pipe 81 and the second connecting pipe 82, for example.

Refrigerant containing more gas components than the refrigerant flowing through the second communication pipe 82 flows through the first communication pipe 81 . In other words, a refrigerant having a smaller specific enthalpy than the first communication pipe 81 flows through the second communication pipe 82 . For example, a refrigerant in a gas state or a refrigerant in a gas-liquid two-phase state in which the gas component is greater than the liquid component flows through the first communication pipe 81 . In the following description, a refrigerant containing more gas components than liquid components will be referred to as a gas refrigerant. A liquid refrigerant or a gas-liquid two-phase refrigerant in which the liquid component is greater than the gas component flows through the second communication pipe 82 . In the following description, a refrigerant containing more liquid components than gas components is referred to as liquid refrigerant. Since the refrigerant circulating in the refrigeration cycle reciprocates using the first communication pipe 81 and the second communication pipe 82, the diameter of the first communication pipe 81 through which a large amount of gaseous refrigerant flows is the same as that of the second communication pipe 82. larger than the pipe diameter.

The air conditioner indoor unit 10 includes a gas pipe 31 for connecting the heat exchanger 20 and the first connecting pipe 81 and a liquid pipe 32 for connecting the heat exchanger 20 and the second connecting pipe 82 . The refrigerant flowing through the gas pipe 31 contains more gas components than the refrigerant flowing through the liquid pipe. Due to this difference in the properties of the refrigerant flowing through the pipe, the outer diameter of the gas pipe 31 is larger than the outer diameter of the liquid pipe 32 . These gas pipes 31 and liquid pipes 32 are refrigerant pipes 30 connected to the heat transfer pipes 21 of the heat exchanger 20 and through which the refrigerant heat-exchanged in the heat exchanger 20 flows.

All of the plurality of heat transfer tubes 21 included in the heat exchanger 20 are made of aluminum. In the present disclosure, the term "aluminum" includes not only those manufactured using aluminum as a material but also those manufactured using an aluminum alloy as a material. The refrigerant pipe 30 connected to the heat transfer pipe 21 made of aluminum is also made of aluminum, and the gas pipe 31 and the liquid pipe 32 are also made of aluminum.

The air conditioner indoor unit 10 is attached to the wall WL of the room RM. In order to connect the air conditioner indoor unit 10 and the outdoor unit 70 , for example, a through hole 110 is formed in the wall WL, and the refrigerant pipe 30 is passed through the through hole 110 . A first member 50 shown in FIG. 2 is attached to the refrigerant pipe 30, for example, at the hatched portion in FIG. The first member 50 extends along the surface of the refrigerant pipe 30 . The first member 50 may be arranged not only in the entire portion indicated by hatching in FIG. 1 but also in part thereof. The first member 50 is cylindrical, and the cross-sectional shape of the first member 50 is annular.

As shown in FIG. 2, the refrigerant pipe 30 has a first portion Pa1 connected to the heat transfer tube 21, a second portion Pa2 connected to the first portion Pa1 and bent, and a second portion Pa2. and a connected third portion Pa3. The third portion Pa3 is a portion between the connecting portion 40 and the second portion Pa2. In other words, the third portion Pa3 is the portion from the second portion Pa2 to the end of the refrigerant pipe 30 . A first portion Pa1, a second portion Pa2 and a third portion Pa3 are present in the gas pipe 31 and the liquid pipe 32, respectively. The first portion Pa1 may be directly connected to the heat transfer tube 21, or may be indirectly connected.

The first member 50 covers the second portion Pa2 of the gas pipe 31 (refrigerant pipe 30). The first member 50 shown in FIG. 2 also covers part of the first part Pa1 and part of the third part Pa3. However, the first member 50 may cover only the second portion Pa2 of the gas pipe 31 (refrigerant pipe 30). Also, the first member 50 may cover part or all of the first portion Pa1 and the second portion Pa2. Also, the first member 50 may cover part or all of the third portion Pa3 and the second portion Pa2. Furthermore, the first member 50 may be configured to cover all of the first portion Pa1, the second portion Pa2 and the third portion Pa3.

(2) Detailed configuration (2-1) Air conditioning indoor unit 10
The air conditioning indoor unit 10 includes a casing 11 having an inlet 12 that takes in air in the room RM (indoor air) and an outlet 13 that blows out conditioned air into the room RM. The cross-flow fan 14 is arranged inside the casing 11 and generates an airflow from the inlet 12 toward the outlet 13 . The heat exchanger 20 is configured in a C shape so as to surround the cross flow fan 14 when viewed from the side. A portion where the C-shaped heat exchanger 20 is open is a portion near the outlet 13 . With such a configuration of the heat exchanger 20 , substantially all of the indoor air sucked from the suction port 12 passes through the heat exchanger 20 . An air filter 15 is arranged between the suction port 12 and the heat exchanger 20 . Since the air passing through the heat exchanger 20 passes through the air filter 15 in advance, dust is removed by the air filter 15 . A drain pan 17 is arranged below the heat exchanger 20 . A drain hose 35 (see FIGS. 4 and 5) is connected to the drain pan 17 to drain the condensed water accumulated in the drain pan 17 to the outside of the air conditioning indoor unit 10 .

The air that has sequentially passed through the suction port 12, the air filter 15, the heat exchanger 20, and the cross-flow fan 14 is conditioned by passing through the heat exchanger 20, and is blown into the room RM from the blow-out port 13. be. A wind direction plate 16 is provided at the outlet 13 . A wind direction plate 16 is provided for changing the direction of the wind in the vertical direction. Although not shown in FIG. 1, a wind vane may be provided for changing the horizontal wind direction.

(2-1-1) Heat exchanger 20
The X1-X2 direction shown in FIG. 2 is the longitudinal direction of the heat exchanger 20 . A plurality of heat transfer tubes 21 of the heat exchanger 20 are arranged along the longitudinal direction. When the refrigerant is allowed to flow while folding back through the plurality of heat transfer tubes 21 , a U-shaped tube 22 is connected to the ends of the two heat transfer tubes 21 . A plurality of heat transfer tubes 21 are arranged so as to pass through a plurality of aluminum fins 23 . The air in the room passes between the plurality of fins 23 so that heat can be exchanged efficiently. The metal parts of heat exchanger 20 are made of aluminum.

(2-1-2) Refrigerant piping 30
The refrigerant pipe 30 includes an aluminum gas pipe 31 and an aluminum liquid pipe 32 . The inner diameter of the gas pipe 31 through which the gas refrigerant having a large volume per unit mass flows is larger than the inner diameter of the liquid pipe 32 through which the liquid refrigerant having a small volume per unit mass flows. Therefore, the gas pipe 31 is more easily crushed than the liquid pipe 32 . In the present disclosure, the collapse of the gas pipe 31 or the liquid pipe 32 refers to deformation of the outer shape from a circular shape to an elliptical shape or other flattened shape when the pipe having an annular cross section is bent.

The gas pipe 31 and the liquid pipe 32 are generally straight pipes with the first portion Pa1 straight in the vertical direction when the air conditioning indoor unit 10 is installed on the wall WL. The third portion Pa3 of the gas pipe 31 and the liquid pipe 32 is normally perpendicular to the first portion Pa1 until the air conditioning indoor unit 10 is transported from the factory to the installation site (hereinafter sometimes referred to as shipping). It is a straight pipe that extends straight along the direction of A second portion Pa2 of the gas pipe 31 and the liquid pipe 32 is a curved portion. Each of the second portions Pa2 is curved, for example, in an arc shape that substantially divides a circle into four equal parts at the time of shipment. The third portion Pa3 is connected to the connecting portions 41 and 42 via connecting members 43 and 44 . The connecting members 43 and 44 are made of copper, for example. By making the connecting members 43 and 44 made of copper, electric corrosion is less likely to occur even if the first connecting pipe 81 and the second connecting pipe 82 are made of copper. Electrolytic corrosion occurs, for example, when moisture such as dew condensation water or rainwater generated in the air conditioning indoor unit 10 comes into contact with dissimilar metals.

FIG. 3 shows the casing 11 viewed obliquely from behind. FIG. 5 shows the casing 11 viewed from behind. A mounting plate 18 is attached to the rear surface of the casing 11 . The installation plate 18 is configured to be removable during installation work. An end portion of a harness 19 for connecting a signal line to the outside is arranged on the outer side of the back surface of the casing 11 .

(2-1-3) First member 50
The first member 50 surrounds the second portion Pa2 of the gas pipe 31 . The first member 50 is, for example, the coil spring shown in FIGS. The first member 50 includes a ring portion 51 located on the second portion. The ring portion 51 is a portion in which a metal wire is wound once. Therefore, the coil spring has multiple ring portions 51 . The ring portion 51 of the coil spring of the first member 50 retains its ring shape even when the coil spring is stretched. Here, holding the ring shape means that the metal wire is helically extended by extending the coil spring, and is substantially in the shape of a ring when viewed in the axial direction of the coil spring. In other words, retaining the ring shape means that the outer shape of the coil spring is not deformed into a flat shape such as an ellipse when viewed in the axial direction. Thus, the coil spring has an elastic structure that can be expanded and contracted. The coil spring used as the first member 50 is tightly wound. The initial tension is, for example, about 0.4N. By tightly winding the coil spring, many ring portions 51 can be arranged around the second portion Pa2, and crushing can be easily suppressed. The difference between the inner diameter D1 of the ring portion 51 of the coil spring and the outer diameter of the second portion Pa2 is 0.1 mm or more and 0.7 mm or less. Since the first member 50 extends along the surface of the refrigerant pipe 30, when the central axis of the coil spring that is the first member 50 and the central axis of the refrigerant pipe 30 are aligned, the coil spring and the refrigerant pipe 30 The gap between and is half of the above difference.

The first member 50 is made of a metal having a nobler potential than aluminum. Examples of metals having a nobler potential than aluminum include iron and copper. If the first member 50 made of a metal having a potential higher than that of aluminum comes into contact with the aluminum refrigerant pipe 30 and condensed water adheres to the interface therebetween, it causes electrolytic corrosion. Therefore, the first member 50 is coated with an anti-electrolytic coating or an insulating member. Electro-corrosion prevention coating includes, for example, cationic electrodeposition coating. Also, the insulating member includes, for example, a heat-shrinkable tube.

The anti-galvanic corrosion coating or insulating member may be applied to the refrigerant pipe 30 instead of the first member 50 . At least the second portion Pa2 of the refrigerant pipe 30 is provided with the anti-electrical corrosion coating or the insulating member, so that it is possible to suppress the electric corrosion of the second portion Pa2 due to the anti-electrical corrosion coating or the insulating member. It is preferable that the electrolytic corrosion prevention coating or the insulating member be applied to the entire portion of the refrigerant pipe 30 to which the first member 50 is attached. Both the first member 50 and the refrigerant pipe 30 may be coated with an anti-electrical corrosion coating or an insulating member.

In the air conditioning indoor unit 10 shown in FIGS. 3 to 5, the coil spring, which is the first member 50, is arranged only in the gas pipe 31. As shown in FIG. However, the first member 50 may be arranged in the liquid tube 32 . In addition, the coil spring covers not only the second portion Pa2 but also the third portion Pa3 over half or more in the longitudinal direction. By covering the circumference over half or more in the longitudinal direction of the third portion Pa3, as shown in FIG. It is often possible to bend the part Pa3.

(3) Modification (3-1) Modification A
In the above embodiment, the air conditioning indoor unit 10 of the type attached to the wall WL has been described, but the air conditioning indoor unit 10 to be the subject of the present disclosure is not limited to the wall WL. For example, the air conditioner indoor unit 10 to be the subject of the present disclosure may be installed on the ceiling or may be placed on the floor.

(3-2) Modification B
In the above embodiment, the case where the first member 50 having an elastic structure capable of expanding and contracting while the ring portion 51 holds the ring shape is described as a coil spring. is not limited to The first member 50 may be, for example, a bellows-shaped metal tubular body that can be expanded and contracted in the axial direction, as shown in FIGS. 8 and 9 . The bellows-shaped metal first member 50 is structured to have a portion with a large inner diameter and a portion with a small inner diameter. In such a bellows-shaped metal first member 50, the difference between the inner diameter D1 of the smallest portion of the first member 50 and the outer diameter of the second portion Pa2 is set to 0.1 mm or more and 0.7 mm or less. is preferably configured to The ring portion 51 of the bellows-shaped first member 50 is preferably short and cylindrical with the inner diameter D1. When ring portion 51 has a cylindrical shape with width W1, it is easier to suppress deformation of the outer shape of refrigerant pipe 30 than when the cross-sectional shape of the portion facing refrigerant pipe 30 is curved.

Further, as shown in FIG. 10, for example, the first member 50 may be formed by forming a metal mesh into a cylindrical shape so as to be able to expand and contract in the axial direction. The net-like first member 50 shown in FIG. 10 includes a ringed metal wire or annulus, which is the ring portion 51, and a metal wire 52 that is arranged along the axial direction and connects the ring portions 51. ing. The state of the net-like first member 50 shown in FIG. 10 is a state in which the metal wires 52 are completely stretched. When attaching the net-like first member 50 to the refrigerant pipe 30, it is attached so that the metal wire 52 is loosened. If the metal wire 52 is loose (bent), the net-like first member 50 can follow the refrigerant pipe 30 when the refrigerant pipe 30 is bent. In order to prevent the refrigerant pipe 30 from being crushed, the thickness of the metal wire or the ring of the ring portion 51 may be made thicker than that of the metal wire 52 arranged along the axial direction to increase the rigidity of the ring portion 51. preferable. The difference between the inner diameter D1 of the net-like first member 50 and the outer diameter of the second portion Pa2 is preferably 0.1 mm or more and 0.7 mm or less.

(3-3) Modification C
In the above-described embodiment, the first member 50 is a member having an elastic structure that allows the ring portion 51 to maintain its ring shape and expand and contract. is not limited. For example, as shown in FIG. 11, the first member 50 may be a metal cylindrical body 55 with cuts 56 so that it can be easily bent, and a plurality of metal rings are fitted. It may be recessed, or it may be a cylindrical body made of metal. By leaving a connecting portion 57 that connects the ring portions 51 when making the cut 56, a structure in which the plurality of ring portions 51 are integrated is obtained, which facilitates handling. The connecting portions 57 are arranged, for example, shifted by a predetermined angle when viewed in the axial direction. In FIG. 11 , the connecting portions 57 are arranged at intervals of 45 degrees when viewed in the axial direction. It is preferable to bend the connecting portion 57 so that it is easy to bend. The difference between the inner diameter D1 of the cylindrical body 55 and the outer diameter of the second portion Pa2 is preferably 0.1 mm or more and 0.7 mm or less.

(3-4) Modification D
In the above-described embodiment, the material of the first member 50 is composed of a metal having a potential higher than that of aluminum, and the first member 50 or the second portion Pa2 of the refrigerant pipe 30 is coated with an anti-corrosion coating or an insulating member. explained the case. However, the material of the first member 50 may be stainless steel and may not be coated with an anti-corrosion coating or an insulating member. When the first member 50 is made of stainless steel, it is possible to suppress the occurrence of electrical decoration due to the passivation film formed on the surface of the stainless steel.

(3-5) Modification E
The first member 50 may be made of aluminum, for example. If the first member 50 and the refrigerant pipe 30 are made of aluminum, electric corrosion is less likely to occur. More preferably, the first member 50 and the refrigerant pipe 30 are made of the same material, aluminum. Aluminum of the same material means that, for example, when both are aluminum alloys, the metal components of both are the same.

(3-6) Modification F
In the above embodiment, the case where the third portion Pa3 of the refrigerant pipe 30 is indirectly connected to the connecting portions 41 and 42 via the connecting members 43 and 44 has been described. However, the third portion Pa3 of refrigerant pipe 30 may be directly connected to connecting portions 41 and 42 .

(4) Features (4-1)
In the air conditioner indoor unit 10 of the above embodiment, the cylindrical first member 50 covers the second portion Pa2 of the aluminum refrigerant pipe 30 . The concept of a cylindrical shape in the present disclosure also includes a coil shape. By preventing the second portion made of aluminum from being deformed into a shape other than a circular cross section with the first member 50, the second portion of the gas pipe 31 in particular can be bent by bending the refrigerant pipe 30 when the air conditioning indoor unit 10 is installed on site. It is possible to prevent the portion Pa2 from collapsing.

(4-2)
In the air conditioner indoor unit 10 of the above embodiment, the plurality of ring portions 51 of the coil spring retain the ring shape even after the first member 50 expands and contracts. Therefore, the first member 50 and the refrigerant pipe 30 can be easily handled when bending the refrigerant pipe 30, and the workability of installing the air conditioning indoor unit 10 can be improved.

(4-3)
In the air conditioner indoor unit 10 of the above-described embodiment, it is possible to prevent electric corrosion between the first member 50 made of a metal having a potential higher than that of aluminum and the refrigerant pipe 30 made of aluminum with an electric corrosion prevention coating or an insulating member. can. With such a configuration, electric corrosion can be suppressed while using a material such as iron that is inexpensive and has a higher tensile strength than aluminum for the first member 50 .

(4-4)
As described in modification D, the first member 50 of the air conditioning indoor unit 10 may be made of stainless steel. By making the first member 50 made of stainless steel, electrical decoration is less likely to occur between the aluminum refrigerant pipe 30 and the first member 50, and corrosion of the refrigerant pipe 30 due to electric corrosion can be suppressed. .

Further, as described in modification E, the first member 50 of the air conditioning indoor unit 10 may be made of aluminum. By making the first member 50 made of aluminum, it is possible to prevent illumination from occurring between dissimilar metals between the aluminum coolant pipe 30 and the first member 50 . As a result, it is possible to suppress corrosion of the aluminum refrigerant pipe 30 in contact with the first member 50 due to electric corrosion.

(4-5)
In the air conditioner indoor unit 10 of the above embodiment, the first member 50 is arranged only on the gas pipe 31 . Since the liquid pipe 32 is thinner than the gas pipe 31, it is less likely to be crushed even if it is bent during installation work. By arranging the first member 50 only on the gas pipe 31, which is likely to be crushed by bending during installation, and not on the liquid pipe 32, the number of parts can be reduced.

(4-6)
The air conditioner indoor unit 10 of the above embodiment is configured such that the difference between the inner diameter of the first member 50 and the outer diameter of the second portion Pa2 is 0.1 mm or more and 0.7 mm or less. When configured in this way, by setting the aforementioned difference to 0.7 mm or less, the first member 50 regulates the deformation when the refrigerant pipe 30 is bent so that the refrigerant pipe 30 is not crushed. can be effectively prevented. Further, by setting the aforementioned difference to 0.1 mm or more, it becomes easier to fit the first member 50 into the refrigerant pipe 30 .

(4-7)
In the air conditioner indoor unit 10 of the above embodiment, the first member 50 covers the circumference of the third portion Pa3 over half or more in the longitudinal direction of the third portion Pa3. With such a relationship between the first member 50 and the third portion Pa3, even when the third portion Pa3 is bent during installation, the portion covered with the first member 50 can be used, and the third portion Pa3 can be bent. It is possible to prevent Pa3 from collapsing.

(4-8)
The air conditioning indoor unit 10 of the above-described embodiment includes connecting portions 41 and 42 for connecting to the first connecting pipe 81 and the second connecting pipe 82 . The third portion Pa3 is connected to the connecting portions 41 and 42 directly or indirectly via connecting members 43 and 44 which are separate members. In the air conditioning indoor unit 10 configured in this manner, the connection portions 41 and 42 can prevent the first member 50 from falling out of the refrigerant pipe 30 during work or the like.

Although embodiments of the present disclosure have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims. .

REFERENCE SIGNS LIST 10 air conditioning indoor unit 20 heat exchanger 21 heat transfer pipe 30 refrigerant pipe 31 gas pipe 32 liquid pipe 41, 42 connecting portion 43, 44 connecting member (example of separate member)
51 ring part Pa1 first part Pa2 second part Pa3 third part

JP 2015-140998 A

Claims (8)

a heat exchanger (20) having aluminum heat transfer tubes (21);
an aluminum refrigerant pipe (30) connected to the heat transfer pipe and through which the refrigerant heat-exchanged in the heat exchanger flows;
a metal first member extending along the surface of the refrigerant pipe;
with
The refrigerant pipe has a first portion (Pa1) connected to the heat transfer pipe, a second portion (Pa2) connected to the first portion and bent, and the refrigerant pipe connected to the second portion. and a third portion (Pa3) extending to the end of
The air conditioning indoor unit (10), wherein the first member surrounds the second portion. The first member includes a ring portion (51) arranged in the second portion, and has an elastic structure in which the ring portion can expand and contract while maintaining a ring shape.
The air conditioning indoor unit (10) according to claim 1. The first member is made of a metal having a nobler potential than aluminum,
The first member or the second portion is coated with an anti-electrolytic coating or an insulating member,
The air conditioning indoor unit (10) according to claim 1 or claim 2. The first member is made of stainless steel or aluminum,
The air conditioning indoor unit (10) according to any one of claims 1 to 3. The refrigerant pipe includes a liquid pipe (32) and a gas pipe (31) through which a refrigerant containing more gas components than the refrigerant flowing through the liquid pipe flows,
The first member is arranged only in the gas pipe,
The air conditioning indoor unit (10) according to any one of claims 1 to 4. The difference between the inner diameter of the first member and the outer diameter of the second portion is 0.1 mm or more and 0.7 mm or less.
The air conditioning indoor unit (10) according to any one of claims 1 to 5. the third portion of the refrigerant pipe is a straight pipe,
The first member covers over half or more of the third portion in the longitudinal direction,
The air conditioning indoor unit (10) according to any one of claims 1 to 6. A connecting part (41, 42) for connecting to a connecting pipe for connecting to an outdoor unit arranged outdoors,
The third portion is directly or indirectly connected to the connecting portion via another member (43, 44),
Air conditioning indoor unit (10) according to any one of claims 1 to 7.

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