JP2010054168A - Outdoor unit for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an outdoor unit for an air conditioner, sufficiently releasing heat of a control board with a simple structure. <P>SOLUTION: The outdoor unit is equipped with a partition plate 40 raised up from a bottom plate in the internal space of a casing 20 to define a heat exchange chamber 31 and a machine chamber 32, the mechanical chamber side surface of an upper partition plate in an upper part of the partition plate including an electric part mounting surface 41a, and this part has an electric part mounting structure in which a control board 110 mounted with electric parts is mounted, and its outer circumferential surface is covered with a board cover 120. The upper partition plate 41 includes an air inlet port 140 for air from the heat exchange chamber, and an air outlet port 141 formed on one outside end of the board cover and on the other outside end of the board cover, respectively. The outdoor unit is further includes a duct plate 150 which covers the outside surface of the substrate cover with a space so as to connect the air inlet port to the air discharge port, thereby forming a duct part 150a for sending air flowing in through the air inlet port to the air outlet port through the outside of the cover. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an outdoor unit of an air conditioner, and more particularly to a technique for enhancing the protection and cooling effect of electrical components arranged in the outdoor unit.

  The outdoor unit of the air conditioner is partitioned into a machine room that houses piping such as a compressor and a four-way switching valve, an outdoor heat exchanger, and a heat exchanger room that houses an outdoor fan by a partition plate. ing.

  The electric parts such as the compressor, the four-way switching valve, and the outdoor fan are driven and controlled by electric parts such as a compressor driving element and a rectifier provided on the control board. These electrical components are accommodated in an electrical component box, and this electrical component box is disposed across a heat exchanger chamber and a machine room in a notch provided at the upper end of the partition plate.

  However, the electric component box is formed by bending a metal plate or forming a box shape with a resin molded product, and when attaching the electric component box to the notch at the upper end of the partition plate, In order to introduce and cool air from the heat exchanger chamber during this period, the structure has become complicated, such as having to take a seal structure to prevent water from entering the machine chamber from the heat exchanger chamber, Manufacturing cost increases.

On the other hand, an outdoor unit is disclosed in which an inverter board having a high heat dissipation property is in contact with the outer plate of the casing or the side of the machine room of the partition plate (see, for example, Patent Document 1). According to this, the waste heat generated by the inverter control element can be dissipated through the outer plate or the partition plate, and it is not necessary to use an electric component box configured to extend to the heat exchanger chamber, and the number of components is reduced. The assembly man-hour can be reduced.
JP 2006-214632 A

  The above-described outdoor unit for an air conditioner has the following problems. When electric parts are arranged directly on the side of the machine room of the partition plate, the compressor drive element, rectifier, etc. can perform heat radiation to the partition plate via the heat sink, but the electrolytic circuit loaded on the control board Since heat is not dissipated in parts such as capacitors, air is dissipated by the air in the machine room, so that air is circulated by providing an opening in the board cover that covers the outer periphery of the electrical parts in order to allow air to flow. Yes. However, the board cover in the machine room must take a structure to prevent the spread of fire into the machine room even if an electrical component such as an electrolytic capacitor ignites, so it cannot take a large opening. For this reason, the cooling effect of the electrical components could not be taken sufficiently.

  Accordingly, an object of the present invention is to provide an outdoor unit of an air conditioner that can ensure sufficient heat dissipation of a control board and safety in a machine room with a simple structure.

  In order to solve the above problems and achieve the object, the outdoor unit of the air conditioner of the present invention is configured as follows.

  A heat exchanger chamber that is provided in a space in the casing so as to stand vertically from the bottom plate and accommodates an outdoor heat exchanger and an outdoor blower; and a machine room that accommodates at least the compressor and a refrigeration cycle piping component connected to the compressor; An electric component mounting surface portion is provided on a side surface of the machine room above the partition plate, and the electric component mounting surface portion includes at least an outdoor fan and a semiconductor component for controlling the compressor and an electrolytic capacitor. In an outdoor unit of an air conditioner having an electrical component mounting structure in which a control board on which components are mounted is attached and an outer peripheral surface thereof is covered with a board cover, the partition plate has a heat exchanger chamber on one end side of the board cover. From the outside of the substrate cover, and an air discharge port is formed on the other outer side of the substrate cover. Covered with a gap so as to communicate with the air flowing in from the air inlet is characterized by comprising a duct plate for forming a ventilating passage to be sent to the air outlet through the outer board cover.

  According to the outdoor unit for an air conditioner of the present invention, it is possible to sufficiently radiate the control board with a simple structure and to ensure safety in the machine room.

  FIG. 1 is a perspective view showing a part of an outdoor unit 10 of an air conditioner according to an embodiment of the present invention with a duct plate omitted, and FIG. 2 is a state in which the top plate is removed and the duct plate is omitted. FIG. 3 is a plan view showing the configuration of the lower inner portion of the outdoor unit in which the blower of the outdoor unit is omitted, FIG. 4 is a right side view showing the outdoor unit in a state in which the right side plate is omitted, and FIG. FIG. 6 is a front view showing an electrical component mounting structure disposed on an upper partition plate constituting the electrical component mounting surface portion of the partition plate with the cover omitted, and FIG. 6 shows an electrical component mounting surface portion on the upper portion of the partition plate with the upper cover of the board cover omitted. FIG. 7 is a sectional plan view showing the electric component mounting structure arranged on the electric component mounting surface portion of the partition plate.

  As shown in FIGS. 1 to 4, the outdoor unit 10 forms an outer shell with a housing 20. The casing 20 includes a rectangular bottom plate 21 on the bottom surface, a front plate 22, a right side plate 23, a left side plate 24, and a top plate 26 on the side surface, which are provided upright from the bottom plate 21.

  The inside of the housing 20 is partitioned into a heat exchanger chamber 31 and a machine chamber 32 by a partition plate 40.

In the heat exchanger chamber 31, an outdoor heat exchanger 50 provided upright vertically along the back side on the bottom plate, and an outdoor blower 60 installed on the front plate 22 side with respect to the outdoor heat exchanger 50. And are provided. The outdoor blower 60 includes a fan motor 61 and a propeller fan 62 attached to the rotation shaft of the fan motor 61. The outdoor blower 60 is supported by a blower support member 63 that is fixed to the bottom plate 21 and the like, and is configured to blow air to the side of the air outlet 28 formed at the edge by the bell mouth 27 formed on the front plate 22.

In the machine room 32, a compressor 91, a discharge side and a suction side pipe of the compressor 91 such as a gas-liquid separator 92, an outdoor heat exchanger 50, a pipe of a refrigeration cycle connected to a pipe connected to the indoor unit. Parts are stored. In addition, electrical components such as a control board 110, the details of which will be described later, are arranged.

  The partition plate 40 stands vertically from the bottom plate 21 and is provided from the front side to the back side, the lower end is fixed to the bottom plate 21, the front side end is in contact with the back side of the front plate 22, and the back side Is in contact with the end plate of the outdoor heat exchanger 50, and the upper end of the partition plate 40 is in contact with the top plate 26.

  As shown in FIGS. 1 and 4, the partition plate 40 is formed by an upper partition plate 41 provided on the top plate 26 side and a lower partition plate 42 provided on the bottom plate 21 side and larger than the upper partition plate 41. Yes.

  The upper partition plate 41 is formed of a material having high thermal conductivity such as aluminum, for example, and is bent in a multistage manner and has a front side bent end portion 41a having a surface facing the heat exchanger chamber 31 on the front plate 22 side, And an electrical component mounting surface portion 41b which is a flat surface portion for mounting electrical components such as the control board 110.

  The lower partition plate 42 includes a front side bent end portion 42a continuously provided in the same shape as the front side bent end portion 41a in the vertical direction, and from the lower end of the upper partition plate 41 to the heat exchanger chamber 31 side. And a closing portion 42c that closes between the lower side of the upper partition plate 41 and the upper end of the protruding portion 42b. The lower partition plate 42 is formed by being molded into the above shape with a material having high rigidity such as iron and having high sound insulation.

  As shown in FIG. 2, an angle α exists between the outdoor heat exchanger 50 and a surface of the protruding portion 42 b of the lower partition plate 42 that faces the outdoor heat exchanger 50. Between the outdoor heat exchanger 50 and the upper partition plate 41, there exists an angle 2α that is an angle twice as large as the angle α.

  As shown in FIGS. 5 to 7, the electrical component mounting surface portion 41 b of the upper partition plate 41 covers the reactor 100, the control board 110, and the control board 110, and protects the control board and the electrical parts of the control board. A board cover 120 that shields the surroundings is attached so that the flame does not spread to other components housed in the machine room 32 even if a short circuit occurs due to some cause. The control board 110 is formed of a rectangular printed board, and is attached to the electrical component mounting surface portion 41b via a gap by fixing means 115 such as mounting screws and spacers.

  In the gap between the control board 110 and the electrical component mounting surface portion 41b, a heat sink 130 is provided in close contact with the electrical component mounting surface portion 41b. The heat sink 130 is wider than the width of the control board 110 in the left-right direction, and a part of the lower portion of the control board 110 is provided on the surface of the heat sink 130 at such a position. As shown in FIG. 7, the heat radiating plate 130 is divided into left and right parts, and each is formed of a material having high thermal conductivity such as aluminum.

  The control board 110 is formed with a control circuit such as a memory for storing a control program. The control board 110 includes a plurality of electrolytic capacitors 111 attached to the surface on the machine chamber 32 side, connectors 112, a compressor driving element (power transistor) 113 attached to the surface on the heat exchanger chamber 31 side, And a rectifier 114.

  The compressor driving element 113 and the rectifier 114 are high heat generating electrical components that generate heat with a predetermined action and raise the temperature of the surroundings.

  The compressor driving element 113 is attached on the surface of the control board 110. On the other hand, the main body portion of the rectifier 114 protrudes downward from the lower end of the upper surface area of the control board 110 and is separated from the compressor driving element 113. As a result, the compressor driving element 113 and the rectifier 114 are less affected by heat even if they generate high heat.

  The compressor driving element 113 and the rectifier 114 have specific heat generating parts. The compressor driving element 113 and the rectifier 114 are attached in close contact with the heat radiating plate 130 facing the heat generating portion.

  The upper partition plate 41 has an air inlet 140 from the slit heat exchanger chamber 31 between the substrate cover 120 and the reactor 100 on the outer one end side 120a of the substrate cover 120 of the electrical component mounting surface portion 41b. In addition, a slit-like air discharge port 141 is provided at the outer other end side 120b of the substrate cover 120 and at the front-side bent end portion 41a. The air outlet 141 is configured to communicate with the vicinity of the air outlet 28 of the heat exchanger chamber 31. Note that the air inlet 140 is larger than the air outlet 141.

  As shown in FIGS. 6 and 7, the outer periphery of the substrate cover 120 is entirely covered with a gap so that the air introduction port 140 and the air discharge port 141 communicate with each other, and the air that has flowed in from the air introduction port 140 is covered. Is provided with a duct plate 150 that forms a duct portion 150a that constitutes a ventilation path that is sent to the air discharge port 141 through the outer surface of the substrate cover 120. That is, the outer end portion 120a of the substrate cover 120 and the outer other end portion 120b of the substrate cover 120 communicate with each other through the duct portion 150a, and the inside of the duct portion 150a is viewed from the heat exchanger chamber 31 side when the outdoor fan 60 is operated. The incoming air can be circulated. The substrate cover 120 is formed of a metallic material such as aluminum that is thermally strong and has high thermal conductivity.

  The substrate cover 120 is attached to the electric component attachment surface portion 41 b of the upper partition plate 41 and covers the control substrate 110. The outer end 120a of the substrate cover 120 is attached in close contact with the electrical component mounting surface 41b on the front side of the air inlet 140. The outer other end 120b of the substrate cover 120 is attached in close contact with the electrical component attachment surface 41b on the front side of the air outlet 141.

  The substrate cover 120 is constituted by an upper cover 121 and a lower cover 122, and the upper cover 121 and the lower cover 122 are fitted together to constitute the substrate cover 120. Thereby, by removing the upper cover 121, the control board 110 is exposed, and it is easy to perform the inspection work of the electrical components. The duct plate 150 has a wall surface through which air from the heat exchanger chamber 31 flows on the outer peripheral surface of the substrate cover 120 and is shielded from components such as the compressor 91 disposed on the lower surface of the machine chamber around the substrate cover. Since the upper surface side is covered with the top plate 26, it may not be covered with a cover in particular.

  The operation of the outdoor unit 10 configured as described above will be described.

  When a signal for starting the air conditioning operation is input to the air conditioner, the compressor 91 is driven and controlled in the outdoor unit 10 to perform the refrigeration cycle operation. At the same time, the outdoor blower 60 is driven, so that air is sucked from the outside of the outdoor heat exchanger 50 formed on the back surface of the heat exchanger chamber 31. The sucked air passes through the outdoor heat exchanger 50.

  During the cooling operation, the refrigerant compressed by the compressor 91 is circulated through the four-way switching valve in the outdoor heat exchanger 50, and the refrigerant and air in the outdoor heat exchanger 50 exchange heat. The refrigerant that exchanges heat with air in the indoor heat exchanger 50 is guided to the indoor unit, and heat-exchanges with the indoor air to air-condition the room.

  The air heat-exchanged with the refrigerant in the outdoor heat exchanger 50 is guided to the bell mouth 27 by the blowing action of the outdoor blower 60 and blown out from the blowout port 28 to the outside.

  In the control board 110, the compressor driving element 113 and the rectifier 114, which are high heat generating electrical components, have their heat generating portions in close contact with the heat sink 130. Since the heat radiating plate 130 and the upper partition plate 41 to which the heat radiating plate 130 is attached are formed of a material having high thermal conductivity, high heat generated by the compressor driving element 113 and the rectifier 114 is diffused in the heat radiating plate 130. Then, heat is transferred to the upper partition plate 41.

  Further, the air exchanged by the outdoor blower 60 flows along the surface of the partition plate 40 on the heat exchanger chamber 31 side. Thereby, the heat-transferred upper partition plate 41 is cooled by the air flowing along the surface of the upper partition plate 41 on the heat exchanger chamber 31 side.

  With respect to the outdoor heat exchanger 50 provided along the back side of the bottom plate 21, the surface of the lower partition plate 42 facing the outdoor heat exchanger 50 of the protruding portion 42b is formed with an inclination angle α therebetween. The upper partition plate 41 is formed with an inclination angle 2α which is twice the angle α. Therefore, the space between the upper partition plate 41 and the outdoor heat exchanger 50 is twice as large as the space between the lower partition plate 42 and the outdoor heat exchanger 50.

  Therefore, the air circulated by the air blowing action of the outdoor blower 60 is in the space between the upper partition plate 41 and the outdoor heat exchanger 50 having a larger space than the space between the lower partition plate 42 and the outdoor heat exchanger 50. Many circulate.

  Since the air discharge port 141 provided in the front side bent end portion 41a of the upper partition plate 41 is configured to communicate with the vicinity of the air outlet 28 of the heat exchanger chamber 31, the air blowing action of the outdoor blower 60 Since air is blown out to the air outlet 28 side, the vicinity of the air outlet 141 outlet side of the heat exchanger chamber 31 is in a negative pressure state, and the air in the duct portion 150a is sucked. For this reason, part of the air flowing along the surface of the upper partition plate 41 on the heat exchanger chamber 31 side flows into the duct portion 150 a from the air inlet 140 provided in the upper partition plate 41. The air that has flowed into the duct portion 150 a flows through the duct portion 150 a in the direction of the arrow in FIG. 7, and flows out from the air discharge port 141 to the vicinity of the outlet side of the air discharge port 141 in the heat exchanger chamber 31.

  Since the air inlet 140 provided on the upstream side of the duct portion 150a is larger than the air outlet 141 provided on the downstream side, the air flowing through the duct portion 150a flows out from the air outlet 141. Increase the flow rate. Thereby, the air which flowed in from the air inlet 140 passes through the duct part 150a with a high flow velocity, and can improve cooling efficiency.

  The high heat generated by the compressor driving element 113 and the rectifier 114 provided on the control board 110 is diffused to the heat radiating plate 130 and transferred to the space covered by the board cover 120. Since the substrate cover 120 is formed of a material having high thermal conductivity, the heat of the space covered by the substrate cover 120 is transferred to the substrate cover 120.

  The air flowing through the duct portion 150 a between the duct plate 150 and the substrate cover 120 cools the substrate cover 120 that has transferred heat. Therefore, the air flowing through the duct portion 150a cools the board cover 120, the space covered by the board cover 120, and the electrical components such as the control board 110 provided in the space.

  Next, the effect of the outdoor unit 10 having the above configuration will be described.

  A heat radiating plate 130 is closely attached and fixed to the upper partition plate 41, and the heat radiating surfaces of the compressor driving element 113 and the rectifier 114, which are high heat generating electrical components, are attached to the heat radiating plates 130. Since a large amount of air flows along the surface of the upper partition plate 41 on the heat exchanger chamber 31 side by the air blowing action of the outdoor blower 60, the heat dissipation plate 130 and the upper heat transferred by the compressor driving element 113 and the rectifier 114 are used. The partition plate 41 is efficiently cooled.

  Further, a part of the air flowing along the surface of the upper partition plate 41 on the heat exchanger chamber 31 side flows into the duct portion 150 a between the duct plate 150 and the substrate cover 120 from the air introduction port 140. Due to the difference in size between the air inlet port 140 and the air outlet port 141, the air efficiently flows in the duct portion 150a, and the substrate cover 120, which has been transferred by the compressor drive element 113 and the rectifier 114, is cooled by the air flowing. Is done.

  As described above, according to the outdoor unit 10 of the air conditioner according to the present embodiment, the air flowing by the blowing action of the outdoor blower 60 is transmitted from both the upper partition plate 41 and the substrate cover 120 to the electric circuit such as the control board 110. Cool the parts. Therefore, electrical components such as the control board 110 are efficiently cooled, and thermal adverse effects are prevented.

  Since electric parts such as the control board 110 are attached to the machine room 32 side of the upper partition 41 constituting the partition 40, the upper part of the conventional partition is horizontally disposed across the heat exchanger room and the machine room. This eliminates the need for an electric parts box, and can reduce assembly workability and cost by reducing the number of parts.

  Since the electrical component box does not exist, the space space above the machine room 32 is expanded, the operation sound attenuation action of the compressor 91 is promoted, and the noise can be reduced. Further, since the electrical components such as the control board 110 are attached to the partition plate 40 itself, a conventional sealing material for preventing water from entering the machine room from between the electrical component box and the partition plate is not necessary.

  Since the partition plate 40 is divided into the upper partition plate 41 and the lower partition plate 42, the lower partition plate 42 can be bent according to the arrangement space of the compressor 91 accommodated in the machine chamber 32, and the productivity is improved. Can be increased.

  The upper partition plate 41 can be made of a material such as aluminum having a high thermal conductivity, and the lower partition plate 42 can be made of a material such as iron having high rigidity and high sound insulation. It can be selected to increase functionality and improve manufacturability and reduce costs.

  The control board 110 side of the board cover 120 and the upper partition plate 41 have a substantially sealed box structure. As a result, even if an electric component such as the control board 110 is ignited or smoked, the board cover 120 and the upper partition plate 41 are almost sealed, so that it spreads to the parts in the machine room 32. Can be prevented.

  In addition, this invention is not limited to the said embodiment. Of course, various modifications can be made without departing from the scope of the present invention.

The perspective view which abbreviate | omits a duct board and shows a part of outdoor unit of the air conditioner which concerns on one embodiment of this invention. The top view which shows the state which removed the top plate in the outdoor unit, and abbreviate | omitted the duct board. The top view which shows a structure part of internal lower side part which abbreviate | omitted the air blower in the outdoor unit. The side view which shows the state which abbreviate | omitted the right side board in the outdoor unit. The front view which shows the electrical component attachment surface part which abbreviate | omitted the duct board and the board | substrate cover in the same outdoor unit. The perspective view which shows the state which abbreviate | omitted the upper cover of the electrical component attachment surface part same as the above. The cut-out top view which shows an electrical component attachment surface part same as the above.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Outdoor unit, 20 ... Housing, 21 ... Bottom plate, 31 ... Heat exchanger room, 32 ... Machine room, 40 ... Partition plate, 50 ... Outdoor heat exchanger, 60 ... Outdoor fan, 110 ... Control board, 120 ... Substrate cover, 140 ... air inlet, 141 ... air outlet, 150 ... duct plate, 150a ... duct part.

Claims (1)

A heat exchanger chamber that is provided in a space in the casing so as to stand vertically from the bottom plate and accommodates an outdoor heat exchanger and an outdoor blower; and a machine room that accommodates at least the compressor and a refrigeration cycle piping component connected to the compressor; A control board on which an electrical component mounting surface portion is provided on the side surface of the machine room above the partition plate, and at least an electrical component for controlling the outdoor fan and the compressor is mounted on the electrical component mounting surface portion. In an outdoor unit of an air conditioner equipped with an electrical component mounting structure in which the outer peripheral surface is covered with a substrate cover,
In the partition plate, an air inlet from the heat exchanger chamber is formed on one end side of the substrate cover, and an air discharge port is formed on the other end side of the substrate cover, respectively.
The outer peripheral surface of the substrate cover of the electrical component is covered with a gap so that the air inlet and the air outlet communicate with each other, and the air flowing in from the air inlet passes through the outer surface of the substrate cover and is an air outlet. An air conditioner outdoor unit comprising a duct plate that forms a ventilation path to be sent to the air conditioner.

Images