Indoor unit of an air conditioner

Abstract

Where the component covering the cross-flow fan overlaps with the cross-flow fan in the longitudinal direction, the airflow decreases. [Solution] The indoor unit 2 comprises a cross-flow fan 22, a first cover portion 26d, a second cover portion 26e, and a heat exchanger 21. The first cover portion 26d covers the first end portion 101 of the cross-flow fan 22. The second cover portion 26e covers the second end portion 102 of the cross-flow fan 22. The heat exchanger 21 has a fin pitch on the first end portion 101 side that is smaller than the fin pitch on the second end portion 102 side. When viewed from a second direction perpendicular to the longitudinal direction of the cross-flow fan 22, the width L1 of the first portion where the first cover portion 26d and the first end portion 101 of the cross-flow fan 22 overlap is greater than the width L2 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet portion 24b side or the intake portion 24a side.

Description

Technical Field

[0001] It relates to an indoor unit of an air conditioner.

Background Art

[0002] In the air flow path, since the air velocity becomes slow at the end of the cross-flow fan, there has conventionally been an indoor unit of an air conditioner that suppresses the decrease in the air velocity at the end by arranging members that cover the upstream and downstream sides of the cross-flow fan (Patent Document 1 (International Publication No. 2019 / 077772)).

Summary of the Invention

Problems to be Solved by the Invention

[0003] There is a problem that the air volume decreases at the portion where the members covering the upstream and downstream sides of the cross-flow fan and the cross-flow fan overlap in the longitudinal direction of the cross-flow fan.

Means for Solving the Problems

[0004] The indoor unit of the air conditioner according to the first aspect includes a cross-flow fan, a first cover portion, a second cover portion, and a heat exchanger. The cross-flow fan is disposed in an air passage extending from a suction port to a blowout port. The first cover portion covers a first end portion which is one end portion in a first direction which is the longitudinal direction of the cross-flow fan. The second cover portion covers a second end portion which is the other end portion in the first direction. The heat exchanger is located on the upstream side of the air passage of the cross-flow fan. The heat exchanger has a plurality of fins and a heat transfer tube. The plurality of fins are arranged at a predetermined fin pitch in the first direction. The fin pitch on the first end portion side of the heat exchanger is smaller than the fin pitch on the second end portion side. When viewed from a second direction which is a direction perpendicular to the first direction, the width of a first portion where the first cover portion and the first end portion side of the cross-flow fan overlap is larger than the width of a second portion where the second cover portion and the second end portion side of the cross-flow fan overlap, at least on either the blowout port side or the suction port side.

[0005] In the indoor unit of this air conditioner, based on the airflow resistance of the heat exchanger, the width of the first portion where the first cover portion and the first end of the cross-flow fan overlap, and the width of the second portion where the second cover portion and the second end of the cross-flow fan overlap, are made different at both ends in the longitudinal direction of the cross-flow fan, thereby suppressing both surging and performance degradation.

[0006] The indoor unit of the air conditioner in the second view is the same as the indoor unit in the first view, and the heat exchanger has heat exchanger piping that constitutes a refrigerant path through which the refrigerant flows. The heat transfer tube has an opening on the second end side. The heat exchanger piping is connected to the opening.

[0007] In the indoor unit of this air conditioner, the fin pitch of the heat exchanger is small and the airflow resistance is large on the side opposite to the second end side, where the heat transfer tubes of the heat exchanger and the heat exchanger piping are connected. However, surging can be suppressed by increasing the width of the first section.

[0008] The indoor unit of the air conditioner in the third view is the indoor unit of the first or second view, and the length of the intake port in the first direction is shorter than the length of the cross-flow fan in the first direction. The length in the first direction from the end of the intake port on the first end side to the first end of the cross-flow fan is greater than the length in the second direction from the end of the intake port on the second end side to the second end of the cross-flow fan.

[0009] In the indoor unit of this air conditioner, by reducing the length of the cross-flow fan in the longitudinal direction from the end of the intake port on the second end side to the second end of the cross-flow fan, it is possible to suppress the increase in airflow resistance on the second end side. As a result, the decrease in airflow velocity on the second end side, where the width of the second portion where the second cover and the second end of the cross-flow fan overlap is small, can be suppressed, and the occurrence of surging on the second end side can be suppressed.

[0010] The indoor unit of the air conditioner in the fourth view is an indoor unit of any of the first, second, or third views, and comprises side walls on the first end side and the second end side of the cross-flow fan. The distance between the first end and the side wall on the first end side is greater than the distance between the second end and the side wall on the second end side.

[0011] In the indoor unit of this air conditioner, by reducing the distance between the second end of the cross-flow fan and the side wall on the second end side, the area on the second end side where airflow can be generated by the cross-flow fan becomes larger, making it less likely for the airflow velocity to decrease on the second end side. As a result, it is possible to suppress the occurrence of surging on the second end side, where the width of the second portion where the second cover and the second end of the cross-flow fan overlap is small.

[0012] The indoor unit of the air conditioner in the fifth perspective is an indoor unit of either the first, second, or fourth perspective, where the ratio of the width of the first part to the outer diameter of the cross-flow fan is 8% or more and 15% or less. The ratio of the width of the second part to the outer diameter of the cross-flow fan is 5% or more and less than 8%.

[0013] In the indoor unit of this air conditioner, even when the outer diameter of the cross-flow fan is large and the airflow velocity is slow, by considering the ratio of the width of the first section to the outer diameter of the cross-flow fan and the ratio of the width of the second section to the outer diameter of the cross-flow fan, it is possible to suppress the decrease in airflow velocity at the first end and prevent surging at the first end.

[0014] The indoor unit of the air conditioner in the sixth view is an indoor unit of any of the first to fifth views, further comprising a duct. The duct blows out air taken in from outside, or draws in indoor air and discharges it outside. The duct is located upstream of the air passage of the cross-flow fan, and is provided on the first end side of the center in the longitudinal direction of the cross-flow fan.

[0015] In the indoor unit of this air conditioner, even when a duct is provided, the width of the first portion where the first cover and the cross-flow fan overlap at the first end can be increased to suppress the duct from acting as air resistance and reducing the airflow velocity. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic diagram of the air conditioning system. [Figure 2] This is a cross-sectional view of the inside of the indoor unit. [Figure 3] This is a perspective view of the support structure. [Figure 4] This diagram shows the support structure of the indoor unit's fan and fan motor. [Figure 5] This figure shows the overlap width of the indoor units in this embodiment. [Figure 6] This diagram illustrates the distance between the end of the indoor unit's fan and the side wall in a modified example. [Figure 7] This figure shows the overlap width of the indoor units in a modified example. [Figure 8] This figure shows the overlap width of the indoor units in a modified example. [Figure 9] This figure shows the overlap width of the indoor units in a modified example. [Figure 10] This figure shows an example of the overlap width of a conventional indoor unit. [Modes for carrying out the invention]

[0017] (1) Overall configuration of the air conditioner Figure 1 is a schematic diagram of an air conditioner 1 having an indoor unit 2. As shown in Figure 1, the air conditioner 1 mainly consists of an indoor unit 2 that is mounted on a wall or the like inside a room, and an outdoor unit 3 that is installed outside. The indoor unit 2 and the outdoor unit 3 are connected to each other via a connecting pipe 4, thereby forming the refrigerant circuit of the air conditioner 1. The air conditioner 1 uses a vapor compression type refrigeration cycle to perform air conditioning operations such as cooling, heating, and dehumidification in the space where the indoor unit 2 is installed.

[0018] (2) Configuration of the indoor unit FIG. 2 is a cross-sectional view of the interior of the indoor unit 2. FIG. 3 is a perspective view of the support 26. The indoor unit 2 is a wall-mounted unit used by hanging the rear surface on an indoor wall. In the following description, the terms indicating directions and surfaces such as front, side, back, top, bottom, right, and left mean the directions and surfaces when the surface on the front panel 25 side of the indoor unit 2 is taken as the front surface, unless otherwise specified.

[0019] The indoor unit 10 includes a heat exchanger 21, a fan 22, a fan motor 23, a casing 24, a front panel 25, a support 26, and a flap 27. The heat exchanger 21 and the fan 22 are fixed to the support 26 and covered by the front panel 25 and the casing 24.

[0020] An air inlet 24a is formed on the upper surface of the casing 24, and an air outlet 24b is formed on the lower surface of the casing 24. The flap 27 is disposed at the air outlet 24b.

[0021] Refrigerant flows inside the heat transfer tube 21b of the heat exchanger 21, and the refrigerant exchanges heat with the air flowing around the heat exchanger 21. The air is sucked in from the air inlet 24a by the rotation of the fan 22. The air flowing from the air inlet 24a to the heat exchanger 21 is blown out from the air outlet 24b into the indoor space through the fan 22. The direction of the blown air can be changed by the position of the flap 27.

[0022] (2-1) Casing The casing 24 is made of, for example, resin and constitutes the front, left and right side surfaces, upper surface, and lower surface of the indoor unit 2. The casing 24 has a thin, substantially rectangular parallelepiped shape with the entire rear surface open. An air inlet 24a is formed on the upper surface of the casing 24. The air inlet 24a is an opening for sucking indoor air into the interior of the indoor unit 2. An air outlet 24b is formed on the lower surface of the casing 24. The air flowing from the air inlet 24a to the heat exchanger 21 is blown out from the air outlet 24b into the indoor space.

[0023] (2-2) Front Panel The front panel 25 is made of, for example, resin and is positioned to cover the front of the indoor unit 2 (casing 24). The front panel 25 is configured to be detachable from the indoor unit 2.

[0024] (2-3) Fan In the vertical cross-section of the indoor unit 2, the fan 22 is positioned approximately in the center of the indoor unit 2, and the heat exchanger 21, which has an inverted V-shape, is arranged to surround the fan 22.

[0025] The fan 22 draws in air from the intake port 24a and supplies it to the heat exchanger 21, and blows out the air that has exchanged heat with the refrigerant in the heat exchanger 21 from the outlet port 24b. In this embodiment, the fan 22 is a cylindrical cross-flow fan that extends long to the left and right. Inside the casing 24, the fan (hereinafter also referred to as the cross-flow fan) 22 is positioned in the air passage 200 that extends from the intake port 24a to the outlet port 24b.

[0026] The cross-flow fan 22 has a first end 101 and a second end 102. The first end 101 is one end of the cross-flow fan 22 in the longitudinal direction and is the left end when viewed from the front. The second end 102 is the other end of the cross-flow fan 22 in the longitudinal direction and is the right end when viewed from the front.

[0027] A shaft 22a extends from the left side of the cross-flow fan 22 in a front view, and a boss 22b extends from the right side of the cross-flow fan 22 in a front view. The shaft 22a is ultimately supported by a bearing 22e. The boss 22b is provided for connection to the motor shaft 23b of the fan motor 23.

[0028] The bearing 28 is fixed to the bearing support portion 26c of the support body 26 and pivotally supports the shaft 22a of the cross-flow fan 22.

[0029] A fan motor 23 that rotates the fan 22 is positioned to the right of the fan 22. The fan motor 23 is fixed to the support body 26. As shown by arrow A0 in Figure 3, the fan motor 23 is inserted from the side into the cylindrical motor outer surface support portion 26b1 of the support body 26. As a result, the fan motor 23 is radially supported on its outer surface by the motor outer surface support portion 26b1. After the fan motor 23 and the fan 22 are assembled into the support body 26, the electrical component box 30 is attached to the support body 26 from the side.

[0030] (2-4) Heat exchanger The heat exchanger 21 is an air heat exchanger that performs heat exchange between the refrigerant passing through the heat transfer tubes 21b and the indoor air in contact with the fins 21a. The heat exchanger 21 functions as an evaporator during cooling operation. The heat exchanger 21 functions as a condenser during heating operation.

[0031] The heat exchanger 21 is located upstream of the air passage 200 of the fan 22. The heat exchanger 21 has a plurality of fins 21a and a plurality of heat transfer tubes 21b (see Figure 5).

[0032] Multiple fins 21a are arranged in the longitudinal direction (first direction) of the fan 22 at a predetermined fin pitch. Multiple heat transfer tubes 21b extend longitudinally through the multiple fins 21a. The fins 21a and heat transfer tubes 21b of the heat exchanger 21 are fixed by expanding the heat transfer tubes 21b by inserting a jig into the heat transfer tubes 21b from the second end 102 side of the fan 22 towards the first end 101 side.

[0033] The heat transfer tubes 21b of the heat exchanger 21 have a hairpin-shaped curved portion 21c on the first end 101 side and an opening 21d on the second end 102 side.

[0034] The heat exchanger 21 has heat exchanger piping 21e that constitutes a refrigerant path through which the refrigerant flows. The heat exchanger piping 21e is connected to the opening 21d. The heat exchanger piping 21e includes various types of piping, such as U-vent pipes, liquid refrigerant pipes connected to the connecting pipe 4, and gaseous refrigerant pipes.

[0035] In the heat exchanger 21, the fin pitch on the first end 101 side is smaller than the fin pitch on the second end 102 side. For example, the left side of the heat exchanger 21 in the first direction is the first end 101 side, and the right side of the heat exchanger 21 in the first direction is the second end 102 side (see Figure 5).

[0036] On the side of the heat exchanger 21 where the fin pitch is smaller, specifically the first end 101 side, the width L1 of the first overlap portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap is large (hereinafter also referred to as the first overlap width). On the side of the heat exchanger 21 where the fin pitch is smaller, the airflow resistance is large, so the airflow velocity tends to decrease. Therefore, by making the first overlap width L1 where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap large, surging can be suppressed.

[0037] The heat exchanger 21 connects the fins 21a and the heat transfer tubes 21b by expanding the tube. The overlap width is large on the side where the tube expansion jig is inserted and on the opposite side (hairpin side), which is the first end 101 side. On the first end 101 side, which is the end of the expanded tube, the fin pitch becomes smaller, which increases the airflow resistance and makes it easy for the airflow velocity to decrease. Therefore, surging can be suppressed by making the first overlap width L1, where the first cover portion 26d and the cross-flow fan 22 overlap, larger.

[0038] Furthermore, the second end 102 side of the heat transfer tube 21b has an opening for inserting an expansion jig, and the heat exchanger piping 21e is brazed to the opening 21d. On the side of the heat exchanger 21 opposite to the side to which the heat exchanger piping 21e is brazed, the first overlap width L1 where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap is large.

[0039] (2-5) Support The support 26 is made of, for example, resin and has a shape that covers the rear and sides of the fan 22. The support 26 fixes the heat exchanger 21 and the fan 22.

[0040] The support 26, together with the casing 24, forms the air outlet 24b at its lower part. The air outlet 24b is an opening through which the air that has flowed from the intake port 24a to the heat exchanger 21 is blown out into the room space. Here, as shown in Figure 1, the air outlet 24b is located at the bottom of the indoor unit 2.

[0041] The air outlet 24b is provided with a flap 27 that can rotate around its pivot axis. The flap 27 adjusts the direction of the conditioned air blown from the air outlet 24b into the room during operation, and closes the air outlet 24b when the unit is stopped.

[0042] Figure 4 shows the support state of the fan 22 and fan motor 23 of the indoor unit 2. Figure 5 shows the overlap width of the indoor unit 2 in this embodiment.

[0043] As shown in Figure 4, the support body 26 is a structure in which the rear wall 26a, motor outer surface support portion 26b1, motor front support portion 26b2, bearing support portion 26c, first cover portion 26d, second cover portion 26e, etc., are integrally molded from a resin material.

[0044] The rear wall 26a covers the rear side of the cross-flow fan 22 and extends downward from the rear side of the cross-flow fan 22, serving to guide the airflow from the cross-flow fan 22 to the outlet 24b.

[0045] The motor outer peripheral support portion 26b1 has a cylindrical shape and covers the motor 23 via vibration-damping rubber, supporting the outer surface of the main body 23a of the fan motor 23 in the radial direction.

[0046] The motor front support portion 26b2 is the portion that supports the front part of the motor body 23a in the thrust direction (direction along the motor shaft 23b), and is formed inside the motor outer peripheral surface support portion 26b1.

[0047] The bearing support portion 26c is provided on the side opposite to the motor outer peripheral surface support portion 26b1 and supports the bearing 28 that pivotally supports the shaft 22a of the cross-flow fan 22.

[0048] The first cover portion 26d extends inward from the bearing support portion 26c by a dimension L3 and covers the first end portion 101 of the cross-flow fan 22 after the cross-flow fan 22 has been assembled. The second cover portion 26e is formed inside the motor front support portion 26b2 so as to cover the second end portion 102 side of the cross-flow fan 22 after assembly. In the support body 26, the left-right width L3 of the first cover portion 26d is larger than the left-right width L4 of the second cover portion 212e.

[0049] The cross-flow fan 22 has a length (width) that is longer than the width W of the opening between the first cover portion 26d and the second cover portion 26e of the support 26 when viewed from below. The first cover portion 26d overlaps with the first end portion 101 of the cross-flow fan 22. The second cover portion 26e overlaps with the second end portion 102 of the cross-flow fan 22.

[0050] Furthermore, as shown in Figure 3, the support 26 has a front drain pan 26h located below the lower end of the front side of the heat exchanger 21, and a rear drain pan 26g located below the lower end of the rear side of the heat exchanger 21.

[0051] Furthermore, the support 26 is formed with a side wall 26j located on the side of the first end 101 of the cross-flow fan 22 and a side wall 26k located on the side of the second end 102 of the cross-flow fan 22. The side wall 26j is the wall of the bearing support portion 26 that faces the cross-flow fan 22. The side wall 26k is the wall of the second cover portion 26e that is perpendicular to the longitudinal direction of the cross-flow fan 22 and faces the cross-flow fan 22. In this embodiment, the distance D1 between the first end 101 of the cross-flow fan 22 and the side wall 26j on the first end 101 side and the distance D2 between the second end 102 and the side wall 26k on the second end 102 side are the same dimension.

[0052] As shown in Figure 4, when viewed from any second direction perpendicular to the first longitudinal direction of the cross-flow fan 22, the width L1 of the first portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap is greater than the width L2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap on the outlet 24b side and the intake 24b side (hereinafter also referred to as the second overlap width).

[0053] As shown in Figure 5, in this embodiment, the width A1 of the first portion where the first cover portion 26d and the first end portion 101 of the cross-flow fan 22 overlap on the outlet 24b side, and the width A2 of the first portion where the first cover portion 26d and the first end portion 101 of the cross-flow fan 22 overlap on the intake port 24a side, are the same dimension. In this embodiment, widths A1 and A2 are each larger than dimension L2, with a dimension L1.

[0054] Furthermore, the width B1 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet 24b side, and the width B2 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the intake port 24a side, are the same dimension. In this embodiment, widths B1 and B2 are each equal to dimension L2.

[0055] Thus, on the side of the air outlet 24b and the side of the suction port 24a, the first overlap width L1 is larger than the second overlap width L2.

[0056] (3) Features (3-1) The indoor unit 2 of the air conditioner 1 according to this embodiment includes a cross-flow fan 22, a first cover portion 26d, a second cover portion 26e, and a heat exchanger 21. The cross-flow fan 22 is positioned in an air passage 200 from an intake port 23a to an outlet port. The first cover portion 26d covers the first end portion 101, which is one end of the cross-flow fan 22 in the first direction, which is the longitudinal direction. The second cover portion 26e covers the second end portion 102, which is the other end of the cross-flow fan 22 in the first direction. The heat exchanger 21 is located upstream of the cross-flow fan 22 in the air passage 200. The heat exchanger 21 has a plurality of fins 21a and heat transfer tubes 21b. The plurality of fins 21a are arranged in the first direction at a predetermined fin pitch. The fin pitch on the first end portion 101 side of the heat exchanger 21 is smaller than the fin pitch on the second end portion 102 side. When viewed from a second direction perpendicular to the first direction, the width L1 of the first portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap is greater than the width L2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap on the outlet 24b side and the intake port 24a side.

[0057] Figure 10 shows an example of the overlap width of a conventional indoor unit.

[0058] As shown in Figure 10, in a conventional indoor unit, the width A1 of the first portion where the first cover portion 263d and the first end 101 of the cross-flow fan 22 overlap on the outlet 24b side, the width B1 of the second portion where the second cover portion 263e and the second end 102 of the cross-flow fan 22 overlap on the outlet 24b side, the width A2 of the first portion where the first cover portion 263d and the first end 101 of the cross-flow fan 22 overlap on the intake port 24a side, and the width B2 of the second portion where the second cover portion 263e and the second end 102 of the cross-flow fan 22 overlap on the intake port 24a side are all the same dimension.

[0059] Due to the characteristics of the cross-flow fan 22, the wind speed at both ends in the longitudinal direction is lower compared to the center of the cross-flow fan 22 in the longitudinal direction, and surging (backflow of wind) occurs at the ends where the wind speed is lower.

[0060] Thus, since airflow is weak at the ends of the cross-flow fan 22, conventionally, the ends of the cross-flow fan 22 are covered with a casing to suppress the decrease in airflow velocity. This results in a uniform distribution of discharged airflow velocity and suppresses the occurrence of surging. However, conventionally, covering a part of the cross-flow fan 22 blocks the cross-flow fan 22, which leads to a problem of reduced airflow.

[0061] To suppress the reduction in airflow, it is necessary to minimize the overlap width between the cover and the cross-flow fan 22. Therefore, the inventor has completed an indoor unit 2 of an air conditioner 1 in which the overlap width between the cover and the cross-flow fan 22 differs on the left and right sides in the longitudinal direction of the cross-flow fan 22, in accordance with the airflow resistance of the heat exchanger 21.

[0062] In the indoor unit 2 of this air conditioner 1, based on the airflow resistance of the heat exchanger 21, the width L1 of the first portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap, and the width L2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap are made different at both ends in the longitudinal direction of the cross-flow fan 22, thereby suppressing both surging and performance degradation.

[0063] (3-2) In this embodiment, the indoor unit 2 of the air conditioner 1 has a heat exchanger 21 which includes heat exchanger piping 21e that constitutes a refrigerant path through which the refrigerant flows. The heat transfer tube 21b has an opening 21d on its second end side. The heat exchanger piping 21e is connected to the opening 21d.

[0064] In the indoor unit 2 of this air conditioner 1, the fin pitch of the heat exchanger 21 is small and the airflow resistance is large on the side opposite to the second end 102 side, which is the side where the heat transfer tubes 21b and heat exchanger piping 21e of the heat exchanger 21 are connected. However, surging can be suppressed by increasing the width L1 of the first section.

[0065] (4) Variations (4-1) Variation 1A The length of the cross-flow fan 22 in the longitudinal direction (first direction) from the end of the suction port 24a on the first end 101 side to the first end 101 of the cross-flow fan 22 may be greater than the length in the first direction from the end of the suction port 24a on the second end 102 side to the second end 102 of the cross-flow fan. The length of the suction port 24a in the first direction is shorter than the length of the cross-flow fan 22 in the first direction.

[0066] In modified example 1A, if the length of the cross-flow fan 22 in the longitudinal direction from the end of the intake port 24a on the first end 101 side to the first end 101 of the cross-flow fan 22 is large, the airflow velocity on the first end 101 side tends to decrease. However, by increasing the width L1 of the first portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap, the decrease in airflow velocity on the first end 101 side can be suppressed.

[0067] Furthermore, in the modified example 1A, by reducing the length of the cross-flow fan in the longitudinal direction from the end of the intake port on the second end side to the second end of the cross-flow fan, it is possible to suppress the increase in airflow resistance on the second end side. This suppresses the decrease in airflow velocity on the second end 102 side, where the width L2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap is small, and suppresses the occurrence of surging on the second end 102 side.

[0068] (4-2) Modification 1B In this embodiment, the case described is when the distance D1 between the first end 101 of the cross-flow fan 22 and the side wall 26j on the first end 101 side and the distance D2 between the second end 102 and the side wall 26k on the second end 102 side are the same dimension, but the embodiment is not limited to this.

[0069] As shown in Figure 6, the distance D1 between the first end 101 of the cross-flow fan 22 and the side wall 26j on the first end 101 side may be greater than the distance D2 between the second end 102 and the side wall 26k on the second end 102 side.

[0070] In modified example 1B, by reducing the distance D2 between the second end 102 of the cross-flow fan 22 and the side wall 26k on the second end 102 side, the area on the second end 102 side where airflow can be generated by the cross-flow fan 22 becomes larger, making it less likely for wind speed to decrease on the second end 102 side. As a result, the occurrence of surging on the second end 102 side, where the width L2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap is small, can be suppressed.

[0071] (4-3) Modification 1C The ratio of the width L1 of the first part to the outer diameter of the cross-flow fan 22 may be 8% or more and 15% or less. Also, the ratio of the width L2 of the second part to the outer diameter of the cross-flow fan 22 may be 5% or more and less than 8%. The ratio of the outer diameter of the cross-flow fan 22 to the width L1 of the first part is greater than the ratio of the outer diameter of the cross-flow fan 22 to the width L2 of the second part.

[0072] In modified example 1C, even when the outer diameter of the cross-flow fan 22 is large and the airflow velocity is slow, by considering the ratio of the width L1 of the first part to the outer diameter of the cross-flow fan 22 and the ratio of the width L2 of the second part to the outer diameter of the cross-flow fan, it is possible to suppress the decrease in airflow velocity on the first end 101 side and suppress the occurrence of surging on the first end 101 side.

[0073] (4-4) Modification 1D The indoor unit of the air conditioner may further include a duct 29. The duct 29 blows out air taken in from outside, or draws in indoor air and discharges it outside.

[0074] As shown in Figure 7, the duct 29 is located upstream of the air passage of the cross-flow fan 22 and is positioned on the side of the first end 101 from the center in the longitudinal direction of the cross-flow fan 22.

[0075] In modified example 1D, even when a duct 29 is provided, the widths A1 and A2 of the first portion where the first cover portion 26d and the cross-flow fan 22 overlap on the first end portion 101 side can be increased to suppress the duct 29 from acting as wind resistance and reducing the wind speed.

[0076] Alternatively, the duct 29 may be configured to blow out humidified air. Even when the duct 29 blows out humidified air, by positioning the duct 29 upstream of the air passage of the cross-flow fan 22 and closer to the first end 101 than the center in the longitudinal direction of the cross-flow fan 22, it is possible to suppress the duct 29 from acting as wind resistance and reducing the wind speed.

[0077] (4-5) Modification 1E In this embodiment, the widths A1 and A2 of the first portion where the first cover portion 26d and the first end 101 side of the cross-flow fan 22 overlap are described as being larger than the widths B1 and B2 of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap on the outlet 24b side and the intake port 24a side, but the embodiment is not limited to this.

[0078] The width of the first portion where the first cover portion and the first end 101 side of the cross-flow fan 22 overlap may be greater than the width of the second portion where the second cover portion and the second end 102 side of the cross-flow fan 22 overlap, at least on either the outlet 24b side or the intake 24a side. In modified example 1E, the width of the first portion where the first cover portion 261d and the first end 101 side of the cross-flow fan 22 overlap is greater than the width of the second portion where the second cover portion 261e and the second end 102 side of the cross-flow fan 22 overlap, on the outlet 24b side.

[0079] As shown in Figure 8, the width A1 of the first portion where the first cover portion 261d and the first end portion 101 of the cross-flow fan 22 overlap on the outlet 24b side is larger than the width B1 of the second portion where the second cover portion 261e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet 24b side.

[0080] Furthermore, the width A2 of the first portion where the first cover portion 26d and the first end portion 101 of the cross-flow fan 22 overlap on the intake port 24a side, and the width B1 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet port 24b side, are the same in dimension.

[0081] In modified example 1E, the width A1 of the first portion where the first cover portion 261d and the first end portion 101 of the cross-flow fan 22 overlap on the outlet 24b side is made larger than the width B1 of the second portion where the second cover portion 261e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet 24b side. This suppresses an increase in airflow resistance on the first end portion 101 side of the cross-flow fan 22.

[0082] (4-6) Modification 1F The width of the first portion where the first cover portion and the first end 101 side of the cross-flow fan 22 overlap may be greater than the width of the second portion where the second cover portion 26e and the second end 102 side of the cross-flow fan 22 overlap on the intake port 24a side.

[0083] As shown in Figure 9, the width A2 of the first portion where the first cover portion 262d and the first end portion 101 of the cross-flow fan 22 overlap on the intake port 24a side is larger than the width B2 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the intake port 242a side.

[0084] Furthermore, the width A1 of the first portion where the first cover portion 262d and the first end portion 101 of the cross-flow fan 22 overlap on the outlet 24b side, and the width B1 of the second portion where the second cover portion 262e and the second end portion 102 of the cross-flow fan 22 overlap on the outlet 24b side, are the same in dimension.

[0085] In the modified example 1F, the width A2 of the first portion where the first cover portion 262d and the first end portion 101 of the cross-flow fan 22 overlap on the intake port 24a side is made larger than the width B2 of the second portion where the second cover portion 26e and the second end portion 102 of the cross-flow fan 22 overlap on the intake port 242a side. This suppresses an increase in airflow resistance on the first end portion 101 of the cross-flow fan 22.

[0086] (4-7) While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of Symbols]

[0087] 1. Air conditioner 2 Indoor unit 3 Outdoor unit 4. Connecting piping 21 Heat exchanger 21a Fin 21b Heat transfer tube 21d opening 21e Heat exchanger piping 22 Fans (Cross-flow Fans) 23 Fan motor 24 Casing 24a Inlet 24b Air outlet 25 Front Panel 26 Support 26d, 261d, 262d, 263d First cover section 26e, 261e, 262e, 263e Second Cover Section 26j, 26k side wall 27 Flap 29 Duct 30 Electrical component box 101 First end 102 Second end 200 air passage D1 Distance between the first end and the side wall D2 Distance between the second end and the side wall L1 First overlap width (width of the first part) L2 Second overlap width (width of the second part) [Prior art documents] [Patent Documents]

[0088] [Patent Document 1] International Publication No. 2019 / 077772

Claims

1. A cross-flow fan (22) is positioned in the air passage (200) from the intake port (24a) to the outlet port (24b), A first cover portion (26d, 261d, 262d) covers the first end (101), which is one end in the first direction, which is the longitudinal direction of the cross-flow fan, A second cover portion (26e, 261e, 262e) covers the second end portion (102), which is the other end portion in the first direction, The heat exchanger (21) of the cross-flow fan is located upstream of the air passage and has a plurality of fins (21a) arranged at a predetermined fin pitch in the first direction, and a heat transfer tube (21b), Equipped with, The heat exchanger has a fin pitch on the first end side that is smaller than the fin pitch on the second end side. When viewed from a first direction perpendicular to the first direction, the width (L1) of the first portion where the first cover portion and the first end side of the cross-flow fan overlap is greater than the width (L2) of the second portion where the second cover portion and the second end side of the cross-flow fan overlap, at least on either the outlet side or the intake side. Indoor unit (2) of air conditioner (1).

2. The heat exchanger has heat exchanger piping (21e) that constitutes a refrigerant path through which the refrigerant flows, The heat transfer tube has an opening (21d) on the second end side, The heat exchanger piping is connected to the opening. The indoor unit of the air conditioner according to claim 1.

3. The length of the intake port in the first direction is shorter than the length of the cross-flow fan in the first direction. The length in the first direction from the end of the intake port on the first end side to the first end of the cross-flow fan is greater than the length in the first direction from the end of the intake port on the second end side to the second end of the cross-flow fan. The indoor unit of the air conditioner according to claim 1 or 2.

4. The cross-flow fan is provided with side walls (26j, 26k) on the first end side and the second end side, The distance (D1) between the first end and the side wall on the first end side is greater than the distance (D2) between the second end and the side wall on the second end side. The indoor unit of the air conditioner according to claim 1 or 2.

5. The ratio of the width of the first portion to the outer diameter of the cross-flow fan is 8% or more and 15% or less. The ratio of the width of the second portion to the outer diameter of the cross-flow fan is 5% or more and less than 8%. The indoor unit of the air conditioner according to claim 1 or 2.

6. A duct (29) that blows out air taken in from outside, or draws in indoor air and discharges it outside. Furthermore, The duct is located upstream of the air passage of the cross-flow fan and is provided on the first end side of the center in the longitudinal direction of the cross-flow fan. The indoor unit of the air conditioner according to claim 1 or 2.

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