JP2011179789A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner that improves safety by reducing power consumption and cost. <P>SOLUTION: The air conditioner includes: an airflow path 23 formed in a casing 20 by connecting an inlet 21 and an outlet 22 opened on the surface of the casing 20; a blower fan 25 arranged in the airflow path 23 and extending in one direction; a heat exchanger 27 arranged facing the inlet 21 and cooling air flowing in from the inlet 21; a heater 28a arranged between the blower fan 25 and the heat exchanger 27 and heating the air flowing in from the inlet 21, which is shorter than the blower fan 25 in a longitudinal direction; a control element 52 controlling the heater 28a, which is located outside the airflow path 23; and a heat sink 70 closely in contact with the control element 52 and arranged between the blower fan 25 on the outside relative to the heater 28a in the longitudinal direction and the heat exchanger 27. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner having a heater and a control element for the heater.

  A conventional air conditioner is disclosed in Patent Document 1. This air conditioner is configured as an integrated type in which an indoor part arranged indoors is installed at the front part and an outdoor part arranged outside the room is installed at the rear part. A compressor for operating the refrigeration cycle is arranged inside the outdoor. An outdoor heat exchanger connected to the compressor is disposed on the rear surface of the outdoor side, and an outdoor fan that cools the outdoor heat exchanger against the outdoor heat exchanger is provided.

  A suction port opens on the front surface of the indoor portion, and a blower outlet opens above the suction port. A blower passage is formed in the indoor portion by a blower duct connecting the suction port and the blower outlet, and a blower fan is provided in the blower passage. An indoor heat exchanger connected to the compressor via a refrigerant pipe is disposed between the blower fan and the suction port. A PTC (Positive Temperature Coefficient) heater is disposed between the blower fan and the indoor heat exchanger.

  When the cooling operation is started, the refrigeration cycle is operated by driving the compressor. Thereby, the indoor heat exchanger becomes an evaporator on the low temperature side of the refrigeration cycle, and the outdoor heat exchanger becomes a condenser on the high temperature side of the refrigeration cycle. The outdoor heat exchanger radiates heat by exchanging heat with the outside air by driving an outdoor fan. Indoor air flows into the air passage from the suction port by driving the blower fan, and the air that has been cooled down by exchanging heat with the indoor heat exchanger is sent out from the air outlet to the room. Thereby, indoor cooling is performed.

  When the heating operation is started, the refrigeration cycle is operated by driving the compressor. Thereby, the indoor heat exchanger becomes a condenser on the high temperature side of the refrigeration cycle, and the outdoor heat exchanger becomes an evaporator on the low temperature side of the refrigeration cycle. The outdoor heat exchanger absorbs heat by exchanging heat with the outside air by driving an outdoor fan. Indoor air flows into the air passage from the suction port by driving the blower fan, and the temperature is raised by exchanging heat with the indoor heat exchanger. Further, the temperature in the air passage is further increased by driving the PTC heater. The heated air is sent into the room through the outlet and the room is heated.

  The PTC heater is formed by sandwiching a heating element having PTC characteristics between electrodes, and is driven by applying a voltage between the electrodes. When the heating element exceeds the Curie point, the resistance value increases rapidly, and the current value and the heat generation amount decrease. Thereby, the calorific value of the PTC heater can be stabilized and hot air at a predetermined temperature can be easily generated, and overheating can be prevented.

  At this time, since the PTC heater is at a low temperature at the time of starting, the resistance value of the heating element is low, and there is a danger that an overcurrent flows and exceeds the power supply capacity. For this reason, Patent Document 2 discloses a control method for controlling the drive of the PTC heater so as not to exceed the power supply capacity by monitoring the current flowing through the PTC heater at the time of starting. That is, the PTC heater is DUTY controlled by a control circuit using a triac element, and is driven by gradually increasing the DUTY ratio at the time of starting. Thereby, the overcurrent at the time of starting of a PTC heater can be prevented.

JP-A-8-152179 (pages 3-5, FIG. 2) Japanese Patent Laid-Open No. 2003-59623 (page 3 to page 6, FIG. 1)

  However, according to the above conventional air conditioner, the triac element generates a large amount of heat, so that the electrical components inside the air conditioner are heated. Thereby, there existed a problem which the safety | security of an air conditioner falls. Further, if a fan for cooling the triac element is provided, there is a problem that the power consumption of the air conditioner increases and the cost increases.

  An object of this invention is to provide the air conditioner which can suppress power consumption and cost, and can improve safety | security.

  In order to achieve the above object, the present invention connects a suction port and a blower opening that are opened on the surface of a housing, and extends in one direction arranged in the air passage, and a ventilation passage formed in the housing. A blower fan, a heat exchanger that is disposed opposite the suction port and exchanges heat with the air flowing in from the suction port, and is arranged between the blower fan and the heat exchanger and flows in from the suction port. A heater that heats the air and is shorter in the longitudinal direction than the blower fan, a control element that controls the heater and that is adjacent to the outside of the blower passage, and is in close contact with the control element and to the heater A heat sink is provided between the blower fan on the outer side in the longitudinal direction and the heat exchanger.

  According to this configuration, when the cooling operation is performed, the indoor air taken into the air passage from the suction port by driving the blower fan is cooled by exchanging heat with the heat exchanger, and sent out from the air outlet to the room. When the heating operation is performed, the room air taken into the air passage from the suction port by driving the air blowing fan is heated by the heater controlled by the control element. You may heat-up the air which distribute | circulates a ventilation path at the time of heating operation with a heat exchanger. The control element is arranged adjacent to the outside of the air passage, and the heat sink that is in close contact with the control element is arranged between the air blowing fan and the heat exchanger on the outer side in the longitudinal direction with respect to the heater so as to avoid heat dissipation of the heater. The The control element is cooled via the heat sink by the airflow flowing through the air passage.

  In the air conditioner configured as described above, it is preferable that the heater is a PTC heater and the control element is a triac element. According to this configuration, the PTC heater is DUTY controlled by the triac element, and an overcurrent at the start of the PTC heater is prevented.

  According to the present invention, in the air conditioner having the above-described configuration, the circuit board is held by opening a circuit board on which the control element is mounted and a window portion through which the control element is inserted on a surface facing the heat sink. It is more preferable to include a cup-shaped substrate holder that molds and a mold material that fills the substrate holder and molds the circuit board and the control element.

  According to this configuration, the circuit board is arranged in the cup-shaped substrate holder, and the control element mounted on the circuit board is in close contact with the heat sink through the window. The substrate holder is filled with a molding material, the circuit board is molded, and the control element disposed in the window is molded. When low-temperature air comes into contact with the heat sink during the cooling operation and condensation occurs in the substrate holder, the molding material prevents the condensed water from adhering to the circuit board and the control element.

  Further, the present invention is the air conditioner having the above-described configuration, wherein the heat sink has a guide groove that extends in one direction and is recessed, and the substrate holder has a fitting portion that fits into the guide groove, A width of at least a part between both side walls of the guide groove is formed wider than a width of the open surface, and the substrate holder is slidably guided in the one direction by fitting the guide groove and the fitting portion. May be. According to this configuration, the fitting portion of the substrate holder is slid and inserted into the guide groove of the heat sink from one direction, the circuit board is arranged in the substrate holder, and the control element is attached to the heat sink.

  According to the present invention, in the air conditioner configured as described above, an engagement protrusion is provided on the facing surface of the substrate holder, and the relative position between the heat sink and the substrate holder is determined by engaging with the engagement protrusion. An engagement hole may be provided in the heat sink. According to this configuration, the fitting portion of the substrate holder is slid into the guide groove of the heat sink from one direction, and the engagement protrusion engages with the engagement hole, thereby positioning the substrate holder.

  In the air conditioner configured as described above, it is more preferable that the control element is screwed to the heat sink and a groove portion into which the control element is fitted is recessed in the heat sink. According to this configuration, the control element is screwed after being installed in the groove portion of the heat sink. At this time, the groove prevents the control element from being turned by tightening the screw.

  According to the present invention, in the air conditioner configured as described above, an arm portion formed of an elastic body that forms an opening on one wall surface in the longitudinal direction of the air passage and sandwiches two opposing surfaces of the peripheral surface of the heat sink. More preferably, a heat sink holder that is fitted to the opening and attached to the wall surface is provided. According to this configuration, the heat sink holder is held by sandwiching the two surfaces of the heat sink with the elastically deforming arm portion, fitted to the opening, and attached to the wall surface of the air passage by screws or the like.

  According to the present invention, the control element of the heater is disposed adjacent to the air passage and the heat sink is disposed in the air passage, so that the control element can be cooled via the heat sink by the airflow flowing through the air passage. Therefore, it is not necessary to provide a fan for cooling the control element, and power consumption and cost can be suppressed and the safety of the air conditioner can be improved.

  Moreover, since the heat sink is disposed outside the heater shorter than the blower fan in the longitudinal direction, an increase in temperature of the control element due to heat radiation of the heater can be suppressed. Furthermore, the air heated by heat exchange with the heat sink can be sent out from the end of the air passage to improve the efficiency of the heating operation. In addition, since the heat sink is disposed in the dead space between the blower fan and the heat exchanger on the outer side in the longitudinal direction with respect to the heater, it is possible to prevent the air conditioner from being enlarged due to the installation of the heat sink.

The perspective view which shows the air conditioner of embodiment of this invention. Side surface sectional drawing which shows the air conditioner of embodiment of this invention The front view which shows the air conditioner of embodiment of this invention The perspective view which shows the Nakahe of the air conditioner of embodiment of this invention The perspective view which shows the control circuit unit of the air conditioner of embodiment of this invention The disassembled perspective view which shows the control circuit unit of the air conditioner of embodiment of this invention Side surface sectional drawing which shows the attachment state of the heat sink and board | substrate holder of the control circuit unit of the air conditioner of embodiment of this invention The front view which shows the attachment state of the heat sink and board | substrate holder of the control circuit unit of the air conditioner of embodiment of this invention Top sectional drawing which shows the attachment state of the heat sink and board | substrate holder of the control circuit unit of the air conditioner of embodiment of this invention The perspective view which shows the wiring state of the control circuit unit of the air conditioner of embodiment of this invention The front view which shows the state before attachment of the heat sink and heat sink holder of the control circuit unit of the air conditioner of embodiment of this invention The front view which shows the attachment state of the heat sink and heat sink holder of the control circuit unit of the air conditioner of embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. FIG.1, FIG.2, FIG.3 is the perspective view, side sectional drawing, and front view which show the air conditioner of one Embodiment. 1 and 3 show a state in which the exterior cover 30 (see FIG. 2) is removed. The air conditioner 1 is configured as an integrated type having an indoor part 2 arranged indoors and an outdoor part 4 arranged adjacent to the indoor part 2 and outdoor.

  A suction port 21 is provided in front of the indoor portion 2, and an outdoor heat exchanger 42 is provided in front of the outdoor portion 4. In the following description, the inlet 21 side is referred to as the front side, and the outdoor heat exchanger 42 side is referred to as the rear side (back side). Moreover, the right side and the left side when facing the suction port 21 are referred to as the right side and the left side of the air conditioner 1.

  The indoor part 2 and the outdoor part 4 are installed on the bottom plate 3 and separated by a partition wall 5 in the front-rear direction. The indoor portion 2 forms a housing 20 surrounded on the outside by the bottom plate 3, the partition wall 5 and the exterior cover 30. An electrical component box 31 in which electrical components are arranged is provided at the right end in the housing 20. Similarly, the exterior 4 forms a casing 40 surrounded by the bottom plate 3, the partition wall 5, and an exterior cover (not shown).

  A compressor 41 that operates the refrigeration cycle is disposed at the right end of the outdoor unit 4. An outdoor heat exchanger 42 connected to the compressor 41 via the refrigerant pipe 47 is disposed on the back surface of the outdoor exterior 4. The outdoor fan 43 made up of a propeller fan is arranged at the center in the left-right direction facing the outdoor heat exchanger 4 and cools the outdoor heat exchanger 42. The outdoor fan 43 and the outdoor heat exchanger 42 are disposed in a housing 44 supported by the partition wall 5 via a bracket 45. The housing 44 forms a duct that guides the airflow from the outdoor fan 43 to the outdoor heat exchanger 42.

  A suction port 21 is opened on the front surface of the exterior cover 30 that covers the indoor portion 2, and an air outlet 22 is opened above the suction port 21. A blower passage 23 that connects the inlet 21 and the outlet 22 is provided in the indoor portion 2. The back surface and the side surface of the air passage 23 are formed by a medium 24 attached on the bottom plate 3. The lower wall of the air passage 23 near the air outlet 22 is formed by a detachable duct member 29 when the exterior cover 30 is removed. The duct member 29 is attached with a louver 26 that changes the air direction of the air outlet 22.

  A blower fan 25 composed of a cross flow fan extending in the left-right direction is provided in the blower passage 23. Between the blower fan 25 and the suction port 21, an indoor heat exchanger 27 connected to the compressor 41 via the refrigerant pipe 47 is disposed to face the suction port 21. The indoor heat exchanger 27 is provided in the longitudinal direction of the blower fan 25 with substantially the same width as the blower fan 25. Below the indoor heat exchanger 27, a drain pan 32 for collecting the condensed water of the indoor heat exchanger 27 and draining it outside is disposed. The drain pan 32 extends below a control circuit unit 50 described later, and collects dew condensation water generated from the control circuit unit 50.

  A heater unit 28 is disposed between the blower fan 25 and the indoor heat exchanger 27. As will be described later, the heater unit 28 is held by an angle 80 that is screwed to a side surface 24a (see FIG. 4) of the naka24. The upper part of the indoor heat exchanger 27 and the heater unit 28 is covered with a duct member 29. By removing the screw for attaching the angle 80 and removing the duct member 29, the heater unit 28 can be attached and detached from above.

  The heater unit 28 is formed by laminating a PTC heater 28a sandwiching a semiconductor element between electrodes and a honeycomb fin 28b. The PTC heater 28a is shorter in the longitudinal direction than the blower fan 25, and a space 33 is formed in the blow passage 23 on the right side of the PTC heater 28a. A terminal portion 28 c of the heater unit 28 is disposed in the space portion 33.

  A control circuit unit 50 having a triac element 52 for controlling the PTC heater 28a is disposed behind the terminal portion 28c. The PTC heater 28a is DUTY controlled by the triac element 52, and is driven by gradually increasing the DUTY ratio at the time of starting. Thereby, the overcurrent at the time of starting of the PTC heater 28a can be prevented.

  FIG. 4 shows a perspective view of the naka24. The Nakaheki 24 has a side surface portion 24a that forms the side wall of the air passage 23, and the right side surface portion 24a is provided with an opening 24b. The control circuit unit 50 is attached to the opening 24b across the inside and outside of the air passage 23. At this time, the heat sink 70 (see FIG. 5) is arranged inside the air passage 23, and the substrate holder 60 (see FIG. 5) is arranged outside.

  5 and 6 show a perspective view and an exploded perspective view of the control circuit unit 50. FIG. The control circuit unit 50 includes a circuit board 51, a board holder 60, a lid 68, a heat sink 70, and a heat sink holder 78. The triac element 52 is mounted on the circuit board 51 and disposed in a cup-shaped board holder 60 made of a resin molded product. As will be described in detail later, the substrate holder 60 is attached to a heat sink 70, and the opening surface of the substrate holder 60 is closed by a lid portion 68 made of a resin molded product.

  7, 8, and 9 are a side sectional view, a front view, and a top sectional view showing a state in which the substrate holder 60 and the heat sink 70 are attached. The heat sink 70 is formed by extrusion molding of aluminum, and a plurality of fins 71 project from one surface.

  A guide groove 73 extending vertically is provided on the reference surface 70 a opposite to the surface on which the fins 71 of the heat sink 70 are formed. The guide groove 73 is formed of dovetail grooves whose side walls are formed in a trapezoidal cross section with slopes, and a part of the width between the side walls is wider than the width of the open surface. A part of the side wall of the guide groove 73 may be formed in a U-shaped cross section, and a part of the width between both side walls may be formed wider than the open surface. A groove portion 72 having a U-shaped cross section extending in the vertical direction is formed in the bottom surface of the guide groove 73. A screw hole 74 is provided in the upper part of the bottom surface of the groove part 72, and an engagement hole 75 is provided in the lower part.

  In the substrate holder 60, a window portion 64 is opened above the surface 60 a facing the heat sink 70. On both sides of the window portion 64 of the facing surface 60a, fitting portions 61 that fit into the guide grooves 73 are provided at a plurality of locations. An engaging protrusion 63 is provided below the opposing surface 60a. A plurality of L-shaped ribs 62 are provided on the inner peripheral surface of the substrate holder 60.

  When assembling the control circuit unit 50, first, the fitting portion 61 of the substrate holder 60 is inserted into the guide groove 73 of the heat sink 70 from below as indicated by an arrow A1 (see FIG. 6). When the substrate holder 60 slides upward by the guide groove 73 and the engagement protrusion 63 engages with the engagement hole 75, the relative position between the heat sink 70 and the substrate holder 60 is positioned. Thereby, it is not necessary to screw the substrate holder 60 to the heat sink 70, and the substrate holder 60 can be easily fixed.

  Next, the circuit board 51 is placed on the rib 62 in the board holder 60. The terminal 52 b of the triac element 52 is bent, and the triac element 52 is arranged in parallel to the circuit board 51. The triac element 52 is fitted into the groove portion 72 of the heat sink 70 through the window portion 64. Then, as shown by an arrow A2 (see FIG. 6), a screw 57 (see FIG. 6) is inserted into a through hole 52a provided in the upper portion of the triac element 52 and screwed into the screw hole 74. As a result, the triac element 52 is fixed in close contact with the heat sink 70.

  At this time, since the triac element 52 is fitted into the groove 72 of the heat sink 70, the rotation of the triac element 52 due to the tightening of the screw 57 is prevented. Therefore, damage due to twisting of the terminal 52b of the triac element 52 can be prevented. In addition, since the circuit board 51 is not fixed to the board holder 60 when the screw 57 is tightened, damage due to twisting of the terminal 52b of the triac element 52 can be prevented more reliably.

  In addition, a concave portion 51a is formed at the upper end of the circuit board 51 so as to expose the through hole 52a by cutting out a portion facing the through hole 52a. The triac element 52 is fixed by a screw 57 through the recess 51a. For this reason, the planar protrusion amount of the triac element 52 from the circuit board 51 can be reduced. Accordingly, it is possible to reduce the size of the control circuit unit 50 by reducing the size of the substrate holder 60 and to reduce the molding material 58 described later.

  When the triac element 52 is attached to the heat sink 70, the substrate holder 60 is filled with a molding material 58 made of a resin such as urethane. The circuit board 51 and the triac element 52 are molded by hardening the molding material 58, and the circuit board 51 is fixed. At this time, the mold material 58 that is transmitted through the gap between the periphery of the window portion 64 and the heat sink 70 before curing is prevented from flowing out to the periphery of the substrate holder 60 due to surface tension. A shield material that prevents the mold material 58 from flowing out may be provided around the substrate holder 60.

  If low-temperature air flowing through the air passage 23 during the cooling operation contacts the heat sink 70, dew condensation may occur in the substrate holder 60. At this time, the molding material 58 can prevent dew condensation from adhering to the circuit board 51 and the triac element 52.

  Further, the triac element 52 is disposed in the upper part in the substrate holder 60. When holes are generated in the mold material 58, dew condensation water on the surface of the mold material 58 may reach the triac element 52. At this time, since the triac element 52 is disposed in the upper part of the substrate holder 60, the possibility that condensed water reaches the triac element 52 can be reduced as compared with the case where it is disposed in the lower part.

  FIG. 10 is a perspective view showing a state in which the circuit board 51 is fixed by filling the molding material 58. A lead wire 59 extending from the circuit board 51 is taken out from an opening 65 opening on the lower surface of the substrate holder 60. Below the substrate holder 60, the lead wire 59 is bent into a U shape and is guided upward by the guide of the holding portion 66 provided on the side surface of the substrate holder 60.

  And the lead wire 59 is connected in the electrical equipment box 31 through the opening part (not shown) provided in the upper part of the electrical equipment box 31 (refer FIG. 3). Thereby, the dew condensation water generated in the substrate holder 60 and transmitted through the lead wire 59 is dropped and collected from the lower end of the lead wire 59 to the drain pan 32 (see FIG. 3). Accordingly, it is possible to prevent the dew condensation water from entering the electrical box 31.

  Next, as shown by the arrow A3 (see FIG. 6), the opening surface of the substrate holder 60 is closed by the lid portion 68. On the inner surface of the lid portion 68, a storage portion 68 a that extends up and down facing the opening 65 of the substrate holder 60 is recessed. By arranging the lead wire 59 in the housing portion 68a, the radius of curvature when the lead wire 59 is bent can be increased. Thereby, breakage of the lead wire 59 can be prevented. Further, it is possible to prevent the lead wire 59 from shifting in the left-right direction.

  Next, the heat sink 70 is held by the heat sink holder 78. 11 and 12 are front views showing a state before and after the heat sink 70 and the heat sink holder 78 are attached. The heat sink holder 78 is made of a resin molded product, and an arm portion 78a that extends in one direction and forms an elastic body protrudes from two upper and lower portions. The arm portion 78 a is formed in an L-shaped cross section and has a standing portion 78 c along the reference surface 70 a of the heat sink 70. A claw portion 78b is formed at the tip of the arm portion 78a so as to face the standing portion 78c.

  As indicated by an arrow A4, the arm portion 78a is elastically deformed and the heat sink 70 is inserted between the both arm portions 78a. At this time, the standing portion 78 c is along the reference surface 70 a of the heat sink 70, and the claw portion 78 b provided at the tip of the arm portion 78 a is engaged with the fin 71. As a result, the arm portion 78 a holds the heat sink 70 by sandwiching two surfaces facing the top and bottom of the heat sink 70.

  The heat sink holder 78 is fitted into the opening 24b (see FIG. 4) of the naka24. Then, a screw is inserted into a through hole 78d (not shown) provided around the upper and lower ends of the heat sink holder 78 and the opening 24b, and is fixed to a screw part 80a (see FIG. 3) of the angle 80. The As a result, the control circuit unit 50 is attached to the medium 24.

  At this time, the substrate holder 60 including the triac element 52 is disposed adjacent to the outside of the air passage 23. The heat sink 70 that is in close contact with the triac element 52 protrudes into the blower passage 23 and is disposed between the blower fan 25 and the indoor heat exchanger 27 on the outer side in the longitudinal direction with respect to the PTC heater 28a.

  Since the screws for attaching the angle 80 and the control circuit unit 50 to the Nakaheki 24 are shared, the number of parts can be reduced. Further, the heat sink 70 can be easily held by the arm portion 78a, and the number of parts can be reduced by omitting a screw for attaching the heat sink 70 and the heat sink holder 78. In addition, since the arm portion 78 a covers the upper and lower surfaces of the guide groove 73 and is fitted to the inner peripheral surface of the opening 24 b, it is possible to prevent air from leaking from the air passage 23 through the guide groove 73.

  In the air conditioner 1 having the above configuration, when the cooling operation is started, the refrigeration cycle is operated by driving the compressor 41. Thereby, the indoor heat exchanger 27 becomes an evaporator on the low temperature side of the refrigeration cycle, and the outdoor heat exchanger 42 becomes a condenser on the high temperature side of the refrigeration cycle. The outdoor heat exchanger 42 radiates heat by exchanging heat with the outside air by driving the outdoor fan 43. Indoor air flows into the air passage 23 from the suction port 21 by driving the blower fan 25, and air that has been cooled down by exchanging heat with the indoor heat exchanger 27 is sent out through the air outlet 22 into the room. Thereby, indoor cooling is performed.

  When the heating operation is started, the refrigeration cycle is operated by driving the compressor 41. Thereby, the indoor heat exchanger 27 becomes a condenser on the high temperature side of the refrigeration cycle, and the outdoor heat exchanger 42 becomes an evaporator on the low temperature side of the refrigeration cycle. The outdoor heat exchanger 42 exchanges heat with the outside air by driving the outdoor fan 43 and absorbs heat. Indoor air flows into the air passage 23 from the suction port 21 by driving the blower fan 25, and heat is exchanged with the indoor heat exchanger 27 to raise the temperature.

  Further, when the PTC heater 28a is driven, the temperature of the air flowing through the air passage 23 is further increased. At this time, the blower fan 25 and the indoor heat exchanger 27 are formed to extend laterally from the PTC heater 28a. Thereby, the heat exchange area of the indoor heat exchanger 27 can be increased. Further, the triac element 52 is cooled via the heat sink 70 by the air flowing through the space 33 on the side of the PTC heater 28a. At this time, the air flowing through the space 33 is heated to exchange heat with the heat sink 70.

  The air heated by the indoor heat exchanger 27 and the PTC heater 28a is sent into the room through the air outlet 22, and the room is heated.

  The compressor 41 may be stopped during the heating operation, and the temperature of the air may be raised only by the PTC heater 28a. Moreover, in the integrated air conditioner only for cooling which can perform only cooling by the driving | operation of a refrigerating cycle, you may enable it to perform the heating operation by the PTC heater 28a.

  According to the present embodiment, the triac element 52 of the PTC heater 28 a is disposed in the air passage 23 adjacent to the air passage 23, so that the triac element 52 is disposed via the heat sink 70 by the airflow flowing through the air passage 23. Can be cooled. Therefore, it is not necessary to provide a fan for cooling the triac element 52, and power consumption and cost can be suppressed and the safety of the air conditioner 1 can be improved.

  Further, since the heat sink 70 is disposed outside the PTC heater 28a that is shorter than the blower fan 25 in the longitudinal direction, the temperature increase of the triac element 52 due to heat radiation of the PTC heater 28a can be suppressed. Furthermore, the air heated by heat exchange with the heat sink 70 is sent out from the end of the air passage 23, and the efficiency of the heating operation can be improved. In addition, since the heat sink 70 is disposed in the dead space between the blower fan 25 and the indoor heat exchanger 27 on the outer side in the longitudinal direction with respect to the PTC heater 28a, the size of the air conditioner 1 can be increased by installing the heat sink 70. Can be prevented.

  Further, the circuit board 51 and the triac element 52 are molded by the molding material 58 that is formed in a cup shape by opening the window portion 64 through which the substrate holder 60 is inserted through the triac element 52. Thereby, when low-temperature air contacts the heat sink 70 during the cooling operation and dew condensation occurs in the substrate holder 60, the molding material 58 prevents the condensed water from adhering to the circuit board 51 and the triac element 52. it can.

  Further, since the heat sink 70 has a guide groove 73 in which at least a part of the width between both side walls is formed wider than the width of the open surface, and the board holder 60 has the fitting portion 61 that fits into the guide groove 73. The substrate holder 60 can be easily attached to the heat sink 70. Further, since a screw for attaching the substrate holder 60 to the heat sink 70 is not required, dew condensation in the substrate holder 60 due to heat conduction through the screw during the cooling operation can be reduced.

  In addition, since the engagement protrusion 63 is provided in the substrate holder 60 and the engagement hole 75 is provided in the heat sink 70, the relative position between the heat sink 70 and the substrate holder 60 is changed by the engagement between the engagement protrusion 63 and the engagement hole 75. Positioning can be performed easily, and the workability of assembly can be improved.

  Further, since the triac element 52 is fitted into the groove portion 72 recessed in the heat sink 70 and screwed, the rotation of the triac element 52 is prevented when the screw 57 is tightened. Therefore, damage due to twisting of the terminal 52b of the triac element 52 can be prevented.

  Further, since the heat sink holder 78 has an arm portion 78 a made of an elastic body that sandwiches two opposing surfaces of the peripheral surface of the heat sink 70 and is fitted and attached to the opening 24 b on the wall surface of the air passage 23. Can be easily held by the heat sink holder 78.

  In this embodiment, although the air which distribute | circulates the ventilation path 23 is heated by the PTC heater 28a controlled by the triac element 52 closely_contact | adhered to the heat sink 70, it is not restricted to this. Heating may be performed using a heater controlled by another control element in close contact with the heat sink 70.

  The present invention can be used for an air conditioner having a heater and a control element for the heater.

DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor part 3 Bottom plate 4 Outdoor exterior 5 Partition wall 20, 40 Housing | casing 21 Suction inlet 22 Outlet 23 Blower passage 24 Nakaheki 24b Opening part 25 Blower fan 26 Louver 27 Indoor heat exchanger 28 Heater unit 28a PTC heater DESCRIPTION OF SYMBOLS 29 Duct member 30 Exterior cover 31 Electrical box 41 Compressor 42 Outdoor heat exchanger 43 Outdoor fan 47 Refrigerant pipe 50 Control circuit unit 51 Circuit board 52 Triac element 58 Mold material 59 Lead wire 60 Substrate holder 61 Fitting part 63 Engagement protrusion 64 Window part 70 Heat sink 71 Fin 72 Groove part 73 Guide groove 75 Engagement hole 78 Heat sink holder 78a Arm part

Claims (7)

  A suction passage that opens on the surface of the housing and an air outlet are connected to each other, a ventilation passage that is formed in the housing, a blower fan that extends in one direction and is disposed in the ventilation passage, and is disposed to face the suction opening. And a heat exchanger that exchanges heat with the air flowing in from the suction port, and is arranged between the blower fan and the heat exchanger to heat the air flowing in from the suction port and is longer than the blower fan. A heater that is short in the direction, a control element that controls the heater and that is adjacent to the outside of the air passage, and that is in close contact with the control element and that is outside the longitudinal direction with respect to the heater and the heat An air conditioner comprising a heat sink disposed between the exchanger.   2. The air conditioner according to claim 1, wherein the heater is a PTC heater and the control element is a triac element.   A circuit board on which the control element is mounted, a cup-shaped board holder that holds the circuit board by opening a window part through which the control element is inserted on a surface facing the heat sink, and filling the board holder The air conditioner according to claim 1, further comprising a molding material that molds the circuit board and the control element.   The heat sink has a guide groove that extends in one direction and is recessed, and the substrate holder has a fitting portion that fits into the guide groove, and at least a part of the width between both side walls of the guide groove is The air conditioner according to claim 3, wherein the air conditioner is formed wider than a width of the open surface, and the substrate holder is slidably guided in the one direction by fitting the guide groove and the fitting portion.   An engagement protrusion is provided on the opposing surface of the substrate holder, and an engagement hole is provided in the heat sink to engage the engagement protrusion and position the relative position between the heat sink and the substrate holder. The air conditioner according to claim 4.   The air conditioner according to any one of claims 3 to 5, wherein the control element is screwed to the heat sink, and a groove portion into which the control element is fitted is recessed in the heat sink.   An opening is formed in one wall surface in the longitudinal direction of the air passage, and has an arm portion made of an elastic body that sandwiches two opposing surfaces of the peripheral surface of the heat sink, and is fitted into the opening to the wall surface. The air conditioner according to claim 1, further comprising a heat sink holder to be attached.

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