JP2020034221A - Indoor unit for air conditioner - Google Patents

Abstract

To provide an indoor unit for an air conditioner preventing the wrong detection of a human body sensor.SOLUTION: A cylindrical heat insulation material 63 is installed in an outer peripheral direction of a cylindrical part 62b of a human detection sensor 60 positioned in an internal space In of a case 10, so that warm air blown by a blower fan 22 during heating operation enters the internal space In through a vertical through hole 27 and a horizontal through hole 28 formed on a side air port side surface 24b or a small gap 80 between the side air port side surface 24b and a blower port side case body 53. Even when the cylindrical part 62b of the human detection sensor 60 positioned in the internal space In is reached, temperature rise of the cylindrical part 62b is prevented by the heat insulation material 63, so that temperature rise of a hemispherical part 62a of the human detection sensor 60 within the range that a photodetector 61 detects heat change occurs can prevent the photodetector 61 from wrongly detecting heat change and executing control by wrongly determining whether or not there is a person inside.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an indoor unit of an air conditioner including a human sensor that can detect the presence or absence of a person in a case.

  Conventionally, in this type, the human body can detect the presence or absence of a person in the room by detecting a thermal change, which is the movement of an object having a certain temperature or higher, by infrared rays in the left and right direction of the case's ventilation opening. The sensor is disposed, and the first and second airflow blocking portions are formed between the blower opening and the human sensor, so that the left and right louvers are directed by the blower fan in a state where the human sensor is arranged. Then, the blown air goes to the location of the human sensor, but the human sensor receives the air by guiding the air to the center side of the air outlet by the first and second airflow blocking units. As a result, there has been an indoor unit of an air conditioner that prevents erroneous detection that a person is present around the case when there is a thermal change. (For example, Patent Document 1)

JP 2016-35364 A

  However, in this conventional device, when a part of the human sensor is installed in the left-right direction of the air outlet with the part positioned inside the case, the air blower adjacent to the air outlet side plate constituting the left-right direction of the air outlet is provided. It is conceivable that the air blows into the inside of the case from the hole formed in the space between the mouth side case body and the side wall plate of the air blow opening, and reaches the human sensor located inside the case. In particular, when the blower fan is driven to have the maximum airflow with the left and right louvers of the blower opening facing the location of the human sensor during the heating operation in which hot air is blown, the amount of warm air reaching the human sensor increases. As a result, the temperature of the lens that constitutes the human sensor rises, and the light receiving element that detects the presence or absence of a person due to a thermal change may erroneously detect the rise in the temperature of the lens as the presence of a person, leaving room for improvement. Was.

In order to solve the above problem, according to claim 1 of the present invention, a box-shaped case, a suction port formed at an upper portion of the case to suck air, and a suction port formed at a lower front portion of the case and sucked from the suction port. A blower port through which air is blown, a heat exchanger provided between the suction port and the blower port in the case, and air blown by the heat exchanger provided in the case and exchanged by the heat exchanger. A blower fan,
A lens hole that is located on one side in the left-right direction of the air outlet and that is open to the case,
A human sensor located in the lens hole to detect the presence or absence of a person,
The human sensor has a light receiving element installed on the substrate and detecting a thermal change, and a lens installed to cover the light receiving element,
The lens includes a hemispherical portion protruding from the lens hole and located outside the case, and a cylindrical portion located in the range from the lens hole to the substrate and located inside the case,
It is characterized in that a cylindrical heat insulating material is installed in the outer peripheral direction of the cylindrical portion.

  Further, the heat insulating material is characterized by being in contact with the cylindrical portion and being sandwiched between the case and the substrate.

  According to the present invention, the motion sensor includes a light receiving element installed on the substrate and detecting a change in heat, and a lens installed to cover the light receiving element and changing the temperature, wherein the lens protrudes from the lens hole. It is composed of a hemispherical part located outside of the lens and a cylindrical part located in the range from the lens hole to the substrate and located inside the case, and a cylindrical heat insulating material is installed in the outer peripheral direction of the cylindrical part, so from the air outlet Even when hot air is blown into the case, the heat of the warm air is transferred from the cylindrical portion to the hemispherical portion because the cylindrical heat insulating material installed in the outer peripheral direction of the cylindrical portion can prevent the temperature of the cylindrical portion from rising. Erroneous detection of the presence or absence of a person by the motion sensor can be prevented.

  Further, since the heat insulating material is in contact with the cylindrical portion and is sandwiched between the case and the substrate, it is possible to prevent the warm air from leaking from the gap between the lens and the lens hole and suppress the temperature rise of the hemispherical portion. Therefore, erroneous detection of the presence or absence of a person by the human sensor can be prevented.

FIG. 3 is a perspective view of a case of the air conditioner according to the embodiment of the present invention. FIG. 2 is a vertical sectional view of the case shown in FIG. 1. FIG. 2 is a partially enlarged perspective view of a case shown in FIG. 1. FIG. 2 is a partially enlarged perspective view of a state in which a blower lateral case body is removed from the case shown in FIG. 1. FIG. 2 is a partially enlarged vertical sectional view illustrating a structure near a human sensor in a case illustrated in FIG. 1. FIG. 2 is a partially enlarged schematic configuration diagram illustrating a structure near a human sensor in a case shown in FIG. 1. FIG. 4 is a control block diagram according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a schematic configuration near an air outlet and a flow of air according to an embodiment of the present invention.

An embodiment of the present invention will be described below with reference to the accompanying drawings. In the description, the front and the rear refer to the direction in which the case protrudes from the wall on which the case is hung, and the wall is the rear. In the drawing, Fr indicates the front, Rr indicates the rear, Le indicates the left, Ri indicates the right, Up indicates the upper side, and Dn indicates the lower side.
<Example>

  Please refer to FIG. 1 and FIG. The indoor unit 1 installed on the indoor wall is composed of a box-shaped case 10, and the case 10 is provided on an upper surface thereof, and has a suction port 21 for sucking air, and takes indoor air into the case 10 and blows air into the room. Fan 22, a plurality of heat exchangers 23 for exchanging heat with the air taken in by the blower fan 22, an air outlet 24 for blowing air passing through the outer periphery of the heat exchanger 23, and an air outlet An upper and lower louver 25 installed in the air outlet 24 to change the air blowing direction into the room up and down, a left and right louver 26 installed in the air outlet 24 to change the air blowing direction into the room left and right, and are arranged above the heat exchanger 22. A filter unit 30 for preventing dust from entering the case 10, a cleaning unit 40 for cleaning the filter 31 provided on the filter unit 30, and cleaning by the cleaning unit 40 A holding portion 12 for temporarily holding the filtered filter 31, a collection box 13 attached to the case 10 for collecting dust, a metal support plate 14 provided on the rear surface of the case 10 and fixed to the wall Wa. ,have.

Please refer to FIG. The case 10 is supported by the rear case body 50 supported by the support plate 14, the center case body 51 supported by the rear case body 50 and covering the rear part of the indoor fan 33, and the center case body 42. A front case body 52 covering the front of the filter unit 30 and an air outlet horizontal case body 53 located to the right of the air outlet 24 and below the front case body 52 are provided. The case body 53 is formed with a lens hole 54 that penetrates through the air vent lateral case body 53, and a hemispherical portion 62 a of the human sensor 60 described below is located in the lens hole 54.

  Please refer to FIG. The air outlet 24 includes an air outlet bottom surface 24a forming a bottom surface, and an air outlet side plate 24b forming a side surface. The air outlet bottom surface 24a and the air outlet side plate 24b are connected to the central case body 51 and screws. Is screwed on. The air outlet side plate 24b has upper and lower through holes 27 through which upper and lower support shafts 25a for supporting the upper and lower louvers 25 are operable in the vertical direction, and left and right supports for the left and right louvers 26 so as to be operable in the horizontal direction. Left and right through holes 28 through which the support shaft 26a passes are formed.

  One end of the upper and lower support shaft 25a is connected to the upper and lower louvers 25, and the other end of the upper and lower support shafts 25a is axially supported by an upper and lower louver motor 91 that operates the upper and lower louvers 25 in the vertical direction. One end of the left and right support shaft 26a is connected to the left and right louvers 26, and the other end is supported by a left and right louver motor 92 that moves the left and right louvers 26 in the left and right directions. Therefore, when the control unit 90 issues a drive start instruction, the upper and lower louver motors 91 and 92 are driven, and the upper and lower louvers 25 and the left and right louvers 26 operate in the respective directions.

  Please refer to FIG. 4 and FIG. Reference numeral 55 denotes a case substrate which is disposed in the case 10 on the right side of the air outlet 24 and is formed of a plastic resin molded product to which electronic components such as a control substrate are attached. The case substrate 55 has a substrate on which the human sensor 60 is installed. The substrate holder 56 to which the 70 can be attached and fixed is formed.

Please refer to FIG. 5 and FIG. The human sensor 60 is fixed to the substrate 70 with solder and detects infrared rays to detect whether there is a thermal change in which an object having heat of a certain temperature or more moves and covers the periphery of the light receiving element 61. A lens 62 made of a resin material.
The lens 62 includes a hemispherical hemispherical portion 62a that abuts on the edge of the lens hole 54, and a cylindrical cylindrical portion 62b at the lower end of the hemispherical portion 62a from the ground surface of the substrate 70. The periphery of the light receiving element 61 is covered by the lens 62.

  Please refer to FIG. The light receiving element 61 has a range in which a heat change is detected extending in a fan shape toward the front as indicated by a dotted line, and is installed on the substrate 70 such that the detection range falls inside the outer peripheral edge of the hemispherical portion 62a. The light receiving element 61 detects a change in heat within the detection range to determine the presence or absence of a person in the room. In addition, the lens hole 54 is formed in a mortar shape from the surface of the blower lateral case body 53 toward the internal space In so as not to hinder the range in which the light receiving element 61 detects a thermal change.

  Please refer to FIG. Numeral 63 denotes a heat insulating material provided so as to cover the cylindrical portion 62b of the lens 62. The heat insulating material 63 prevents the temperature of the hemispherical portion 62a from rising due to the heating of the cylindrical portion 62b. Can detect a heat change in the hemispherical portion 62a and prevent erroneous detection that a person is present in the room.

  Please refer to FIG. The heat insulating material 63 is made of a foamed resin such as urethane foam, and is formed in a donut shape in contact with and covering the entire outer peripheral surface of the cylindrical portion 62b. The installation procedure of the heat insulating material 63 is as follows. The heat insulating material 63 is fitted on the lens 62 so that the heat insulating material 63 is in contact with the outer peripheral surface of the cylindrical portion 62b. The heat insulating material 63 is sandwiched between the horizontal case body 53 and the substrate 70. As a result, the gap between the lens hole 54 and the lens 62 can be filled, so that the warm air can be prevented from leaking from the gap between the lens hole 54 and the lens 62 during the heating operation, and the hemispherical portion 62a The light-receiving element 61 can prevent the false detection of the presence of a person by detecting a heat change due to the temperature rise due to the heating, and the heat-insulating material 63 is closely attached to the periphery of the cylindrical portion 62b using an adhesive or the like. Since there is no need, it is possible to easily fix the heat insulating material 63 in close contact with the outer peripheral surface of the cylindrical portion 62b.

  Please refer to FIG. Reference numeral 90 denotes a control unit constituted by a microcomputer, which sets the magnitude of the air flow according to the operation of an air volume change switch provided on the remote controller 100, and sets the rotation speed of the blower fan 22 to the rotation speed according to the set air volume. Further, the upper and lower louver motors 91 and the left and right louver motors 92 are driven according to the operation of a wind direction change switch (not shown) provided on the remote controller 100, and the upper and lower louvers 25 and the left and right louvers 26 are set to an arbitrary angle within a predetermined range. Set.

Here, the operation of each unit of the indoor unit 1 based on the detection result of the human sensor 60 will be described.
When an operation switch (not shown) provided on the remote controller 100 is operated and an instruction to start a predetermined operation mode is issued, the control unit 90 issues a drive instruction to a compressor or the like in an outdoor unit (not shown) and outputs a temperature of the heat exchanger 23. When the predetermined value is reached in the set operation mode, the blower fan 22 is driven so that a predetermined air volume is blown from the blower port 24, and the upper and lower louvers 25 and the left and right louvers 26 are positioned at a predetermined angle.

  If a person is present in the room where the indoor unit 1 is installed when the predetermined operation mode is performed, the set operation is continued by detecting a heat change by the light receiving element 61 of the human sensor 60. When a state in which no person is present in the room where the indoor unit 1 is installed and a heat change cannot be detected by the light receiving element 61 of the human sensor 60 continues for a first predetermined time or more, the control unit 90 determines the rotation speed of the blower fan 22. And reduce the air volume. After the rotation speed of the blower fan 22 is reduced, if the state in which the light change is not detected by the light receiving element 61 of the human sensor 60 continues for the second predetermined time or more, the control unit 90 stops the drive of the blower fan 22 and sets the indoor Stop the air conditioning operation of.

  Then, after the presence of a person cannot be detected by the light receiving element 61 of the human sensor 60 and the rotation speed of the blower fan 22 is reduced or stopped, the presence of a person in the room is detected by the light receiving element 61 of the human sensor 60. If it can be detected, the control unit 90 returns the rotation speed of the blower fan 22 to a predetermined set rotation speed in a predetermined operation mode, and continues the air conditioning operation in the set operation mode.

  As described above, at the time of driving in the predetermined driving mode, the rotation speed of the blower fan 22 is reduced or the blower fan 22 is stopped in accordance with the time during which the presence sensor 60 cannot detect the presence of a person in the room. While the air conditioning operation in the predetermined operation mode is continued by the indoor unit 1 in spite of the absence of a person in the room, it is possible to prevent the energy saving performance from being reduced, and to perform the predetermined operation when the presence of the person is recognized. Since the driving in the driving mode is performed again, it is possible to maintain indoor comfort when a person is present in the room.

  Please refer to FIG. 4 and FIG. The case 10 has an internal space In surrounded by an air outlet side plate 24b, a central case body 51, a front case body 52, and an air outlet horizontal case body 53, and a substrate case 55 is provided in the internal space In. , A vertical louver motor 91 and a left and right louver motor 92 are provided.

  Please refer to FIG. 6 and FIG. In the motion sensor 60 installed on the substrate 70, the cylindrical portion 62b is located in the internal space In, and the hemispherical portion 62a is located outside the internal space In. The outer peripheral surface of the cylindrical portion 62 b located in the internal space In is covered with a heat insulating material 63, and the heat insulating material 63 is sandwiched between the blower lateral case body 53 and the substrate 70.

  Referring to FIG. When a heating operation is instructed by the remote controller 100, a high-temperature refrigerant flows from the outdoor unit (not shown) connected to the case 10 into the heat exchanger 23 via the refrigerant pipe. After the high-temperature refrigerant flows into the heat exchanger 23, the air blown by the blower fan 22 is driven to heat the air sucked from the suction port 21 by the heat exchanger 23 and blow the warm air from the blower port 24 into the room. At this time, the blown warm air passes through the upper and lower through holes 27 and the left and right through holes 28 formed in the air outlet side plate 24b and enters the internal space In. Further, the warm air passes through a small gap 80 between the blower opening side plate 24b and the blower horizontal case body 53 and enters the internal space In.

  In particular, if the blower fan 22 is driven by the instruction of the remote controller 100 to have the maximum air volume and the left and right louvers 26 are set to face the substrate 70, the upper and lower through holes 27, the left and right through holes 28, and the gap 80 are formed. The amount of warm air passing through and entering the internal space In increases.

  Then, the warm air that has entered the internal space In reaches the cylindrical portion 62b of the motion sensor 60, but the heat is blocked by the heat insulating material 63 to prevent the temperature of the cylindrical portion 62b from rising. Accordingly, it is possible to prevent the light receiving element 61 from detecting a heat change due to the temperature rise of the hemispherical portion 62a of the lens 62 and erroneously detecting that a person exists in the room.

  Hereinafter, effects of the air conditioner of the present invention will be described.

  Please refer to FIG. 4, FIG. 6 and FIG. Since the cylindrical heat insulating material 63 is installed in the outer peripheral direction of the cylindrical portion 62b of the human sensor 60 located in the internal space In of the case 10, the warm air blown by the blower fan 22 during the heating operation is supplied to the side wind opening side surface 24b. Through the upper and lower through holes 27 and the left and right through holes 28 formed in the inner space In or through the small gap 80 between the blower opening side plate 24b and the blower horizontal case body 53. The heat insulator 63 prevents the temperature of the cylindrical portion 62b from rising even when the cylindrical portion 62b of the human sensor 60 is located. Therefore, the hemisphere of the human sensor 60 is within a range where the light receiving element 61 detects a thermal change. When the temperature of the portion 62a rises, the light receiving element 61 erroneously detects a change in heat, and erroneously determines that a person is present even though no person is present in the room. And the predetermined driving mode is continued even when the user has instructed the driving mode based on the detection of the presence of the person by the human sensor 60 and the time during which no person is present continues. Can be prevented from being distrusted.

  In particular, when the left and right louvers 26 face the substrate 70 side while the blower fan 22 is driven at the maximum air volume in the set operation mode, the hemisphere of the human sensor 60 within the range where the light receiving element 61 detects a thermal change. Since the temperature rise of the portion 62a can be prevented, the light-receiving element 61 erroneously detects a heat change due to the temperature rise of the hemispherical portion 62a, thereby preventing the control from being executed erroneously in determining the presence or absence of a person in the room. be able to.

  Further, since the heat insulating material 63 is in contact with the cylindrical portion 62b and is sandwiched between the air outlet lateral case body 53 and the substrate 70, the gap between the lens hole 54 and the lens 62 can be filled. It is possible to suppress the warm air from leaking out of the gap between the lens hole 54 and the lens 62, and the light receiving element 61 detects a heat change due to the heating of the hemispherical portion 62a and the temperature rises, thereby erroneously detecting the presence of a person. In addition, since the heat insulating material 63 does not need to be in close contact with the periphery of the cylindrical portion 62b using an adhesive or the like, the heat insulating material 63 is easily fixed in a state of being in close contact with the outer peripheral surface of the cylindrical portion 62b. be able to.

  In addition, a simple configuration in which a heat insulating material 63 is provided in contact with the outer peripheral surface of the cylindrical portion 62b of the human sensor 60 can prevent erroneous detection of the presence or absence of a person. There is no need to take measures to increase the cost and complexity of the structure, such as installing a wind shield or the like that blocks the wind.

  In the embodiment of the present invention, the heat insulating material 63 is provided so as to be in contact with the entire outer peripheral surface of the cylindrical portion 62b of the human sensor 60. However, the temperature of the hemispherical portion 62a within which the light receiving element 61 detects a thermal change is set. Since it is only necessary to prevent the rise, a heat insulating material 63 that contacts only the cylindrical portion 62b near the lens hole 54 or a cylindrical heat insulating material 63 that is provided at a position separated from the cylindrical portion 62b by a predetermined distance is used. If the heat insulating material 63 is installed in the cylindrical portion 62b at a position where it does not cover the detection range of the light receiving element 61 and can prevent the temperature rise of the hemispherical portion 62a, regardless of the shape and range, It is included in the scope of the present invention.

  Further, in the present embodiment, the sponge-shaped heat insulating material 63 has been described. However, the present invention is not limited to this, and the cloth-shaped heat insulating material 63 is wound around the cylindrical portion 62b to form a tube, and the temperature of the cylindrical portion 62b rises. This may be included in the scope of the present invention regardless of the material and shape of the heat insulating material 63 as long as it can be formed in a cylindrical shape.

DESCRIPTION OF SYMBOLS 1 Indoor unit 10 Case 21 Suction port 22 Blow fan 23 Heat exchanger 24 Blow port 24b Blow port side plate 26 Left and right louver 53 Blow port horizontal case body 54 Lens hole 60 Human sensor 61 Light receiving element 62 Lens 62a Hemisphere part 62b Cylindrical part 63 Insulation

Claims (2)

A box-shaped case, a suction port formed at an upper portion of the case to suck air, a blow port formed at a lower portion of a front surface of the case, and to which air sucked from the suction port is blown, and the suction port in the case And a heat exchanger installed between the blower, and a blower fan installed in the case and blowing air exchanged by the heat exchanger,
A lens hole that is located on one side in the left-right direction of the blower opening and is open to the case,
A human sensor located in the lens hole to detect the presence or absence of a person,
The human sensor has a light receiving element installed on the substrate and detecting a thermal change, and a lens installed to cover the light receiving element,
The lens includes a hemispherical portion protruding from the lens hole and located outside the case, and a cylindrical portion located in the range from the lens hole to the substrate and located inside the case,
An indoor unit for an air conditioner, wherein a cylindrical heat insulating material is provided in an outer peripheral direction of the cylindrical portion.   The indoor unit of an air conditioner according to claim 1, wherein the heat insulating material is in contact with the cylindrical portion and is sandwiched between the case and the substrate.

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