JP2013064564A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of further effectively attenuating unnecessary radiation noise that cannot be completely attenuated by a noise filter.SOLUTION: The air conditioner includes an electrical unit placed on a side of a front face of an indoor unit. The electrical unit accommodates a substrate 8c therein, on which an alternating-current circuit block 132, a high-voltage direct-current circuit block 133 and a low-voltage direct-current circuit block 134 are arrayed in order from a connection side of an alternating-current power cord toward a longitudinal direction of the electrical unit. A ground (GND) pattern 140 of the low-voltage direct-current circuit block 134 and a pattern of the alternating-current circuit block 132 are placed adjacent to each other, and a farthest end point of the GND pattern 140 is connected to the earth.

Description

  The present invention relates to an arrangement configuration of electrical units in an indoor unit of an air conditioner.

  In a conventional air conditioner, there is one in which an electrical unit having electrical components inside is arranged on the front side to increase the heat exchange amount by increasing the width dimension of the indoor heat exchanger (for example, Patent Document 1). reference).

  Further, since the AC power cord for supplying power is generally drawn from the right or left end, when the electrical component is arranged on the front surface of the heat exchanger, the AC power cord is connected to the end surface of the electrical unit. At the same time, the internal configuration of the electrical unit is composed of an AC block, a high-voltage DC block, and a low-voltage DC block sequentially from the side to which the AC power cord is connected.

JP-A-8-110085

  Here, the cause of the unnecessary radiation noise generated from the electronic circuit is caused by the switching operation of a switching element such as a transistor or FET as represented by a switching power supply or a high-voltage power supply, but these circuit blocks are on the DC circuit side. Thus, a noise filter must be formed between the DC circuit block and the AC circuit block to prevent unwanted radiation noise from leaking to the primary side.

  However, it is difficult to reduce the noise generated on the DC side to zero, and the noise filter has a problem that the unwanted radiation noise is only attenuated to some extent by the attenuation performance determined by the frequency performance of the impedance. It was.

  In order to solve the above-described conventional problems, an object of the present invention is to provide an air conditioner that can effectively further attenuate unnecessary radiation noise that cannot be attenuated by a noise filter.

  In order to solve the above-described conventional problems, an air conditioner of the present invention is an air conditioner in which an electrical unit is disposed on the front side of an indoor unit, and an AC power cord is mounted on a substrate disposed in the electrical unit. The AC block, high-voltage DC block, and low-voltage DC block are configured from the connection side to the longitudinal direction of the electrical unit. The GND pattern of the low-voltage DC block is brought close to the AC block pattern, and the most advanced point of the GND pattern is grounded. By connecting, unnecessary radiation noise that cannot be attenuated by the noise filter can be effectively further attenuated without using a special circuit or component.

  The present invention can provide an air conditioner that can effectively further attenuate unnecessary radiation noise that cannot be attenuated by a noise filter.

1 is an external perspective view of an indoor unit of an air conditioner according to Embodiment 1 of the present invention. (A) Front view of the indoor unit in the first embodiment (b) Front view of the indoor unit with the front panel removed in the first embodiment (A) AA sectional view at the time of operation stop of the indoor unit in the first embodiment (b) AA sectional view at the time of operation of the indoor unit in the first embodiment External perspective view of the electrical unit in the first embodiment The disassembled perspective view of the electrical equipment unit in Embodiment 1 Arrangement diagram of electrical units in the first embodiment BB sectional view in the first embodiment Main part schematic diagram in the first embodiment (A) Enlarged view of part C in the first embodiment (b) Direct view from the D direction Relationship between base and cover (A) Enlarged exploded view of the connection part in the first embodiment (b) Enlarged assembly view of the connection part in the first embodiment (A) Configuration diagram of stopper in the first embodiment (b) Configuration diagram of stopper in another embodiment Configuration diagram of substrate in the first embodiment

  An air conditioner according to a first aspect of the present invention is an air conditioner in which an electrical unit is disposed on the front side of an indoor unit, and the longitudinal direction of the electrical unit from the connection side of the AC power cord on the board disposed in the electrical unit. By configuring the AC block, high-voltage DC block, and low-voltage DC block in the direction, the GND pattern of the low-voltage DC block is brought close to the pattern of the AC block, and the most advanced point of the GND pattern is connected to the ground. Unwanted radiation noise that cannot be attenuated can be further attenuated effectively without using a special circuit or component.

  In the air conditioner of the second invention, particularly in the first invention, the electrical unit includes a base on which a substrate on which electrical components are arranged and a cover for the base are provided, and the base extends along the periphery. By providing the groove and providing the cover with a convex shape that fits into the groove, the path of impurities into the interior of the electrical unit becomes complicated, and intrusion can be suppressed.

  In the air conditioner of the third invention, particularly in the second invention, the flame retardant member is disposed between the base and the cover, so that safety can be improved.

  In the air conditioner according to the fourth aspect of the invention, particularly in the third aspect of the invention, the flame retardant member is soft, so that the adhesion between the base and the cover can be improved.

  In the air conditioner of the fifth invention, particularly in the second to fourth inventions, in the side walls on both sides constituting the groove, the inner side walls are made higher than the outer side walls, thereby It is possible to prevent entry.

  In the air conditioner of the sixth invention, particularly in the second to fifth inventions, the provision of a sheet metal cover formed of a sheet metal that covers the cover further prevents fire spread and can improve safety.

  In the air conditioner of the seventh invention, in particular, in the sixth invention, by coating the outer surface of the sheet metal cover, it is possible to prevent cuts on the human body due to sheet metal edges and burrs during maintenance, and to improve safety. be able to.

In the air conditioner of the eighth invention, in particular in the sixth or seventh invention, the cover is provided with an insertion part into which the end of the sheet metal cover can be inserted, so that the edge of the sheet metal cover is hidden. Furthermore, safety can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is an external view of an indoor unit of an air conditioner according to the present embodiment, FIG. 2A is a front view of a state in which a front panel of the indoor unit is attached, and FIG. 2B is a front panel of the indoor unit. FIG. 3A is a sectional view taken along line AA when the indoor unit is stopped, and FIG. 3B is a sectional view taken along line AA when the indoor unit is in operation. In addition, the air conditioner in this Embodiment is comprised by connecting the indoor unit 1 installed indoors, and the outdoor unit (not shown) installed outdoors with refrigerant | coolant piping and a connecting wire.

  The configuration of the indoor unit will be described with reference to FIGS. 1 to 3. The indoor unit 1 in the present embodiment has a front panel 2 that has a top suction port 2a that sucks in from the top side and a front suction port 2b that sucks in from the front side, and covers the front side of the front suction port 2b on the front side. Have. When the operation of the indoor unit 1 is stopped, the front panel 2 is in a closed state, but when the operation is started, the front panel 2 is opened and the amount of air to be sucked is increased.

  Moreover, it has the blower outlet 3 which ventilates indoors, and is provided with the up-and-down blade 3a which changes a wind direction up and down, and the left and right blade 3b which changes a wind direction to right and left. The indoor unit 1 includes a substantially inverted V-shaped indoor heat exchanger 5, an indoor fan 6 for blowing air into the room, and an air filter 7 for collecting dust. The air filter 7 is held by the filter frame 7a. The air filter frame 7a is equipped with an automatic cleaning device that automatically cleans the air filter 7, but this description is omitted.

  Then, the indoor fan 6 is driven to generate a flow of wind, and the indoor air is sucked from the top suction port 2a and the front suction port 2b, and the refrigerant and the indoor air are heat-exchanged by the indoor heat exchanger 5, If there is room air, the room air that has become cold is sent to the room.

  In the indoor unit configured as described above, the electrical unit 8 is arranged at a location partitioned by the top surface inlet 2a, the front surface inlet 2b, and the front surface of the indoor heat exchanger 5. By disposing the electrical unit 8 in this manner, the electrical unit 8 is disposed by effectively utilizing the dead space defined by the top surface suction port 2a, the front surface suction port 2b, and the indoor heat exchanger 5. The lateral direction of the indoor heat exchanger 5 can be lengthened without arranging the electrical unit 8 on the side of the vessel 5, and the heat exchange performance in the indoor heat exchanger 5 can be improved.

  The electrical unit 8 generates heat because it has a substrate on which electrical components are arranged. However, the electrical unit 8 can be cooled by the wind sucked from the top surface suction port 2a and the front surface suction port 2b. Moreover, since the electrical equipment unit 8 is disposed above the indoor heat exchanger 5, it is possible to suppress the drain water generated in the indoor heat exchanger 5 from being applied, and to improve the reliability.

  Next, the configuration of the electrical unit 8 will be described. 4 is an external perspective view of the electrical unit 8, and FIG. 5 is an exploded perspective view of the electrical unit 8. FIG. 6 is a view showing the positional relationship between the electrical unit 8 and the filter frame 7a.

As shown in FIGS. 4 to 6, the electrical unit 8 includes a support plate 8 a made of sheet metal, a base 8 b made of flame-retardant resin, a substrate 8 c on which electrical components are arranged, and flame retardant. It can be disassembled into a cover 8d formed of a conductive resin and a sheet metal cover 8e formed of sheet metal. In this embodiment, the ABS resin is used as the flame-retardant resin used in the base 8b and the cover 8d. However, the present invention is not limited to this, and other flame-retardant resins may be used. .

  Also, the terminal block 8f to which the internal / external connection wires connecting the electrical components in the board 8c and the electrical components of the outdoor unit (not shown) are connected is separated from the electrical unit 8 and arranged on the side, and the front side The connecting portion to which the inner and outer connecting electric wires are connected faces the front direction so that the work can be performed from the front.

  The support plate 8a is disposed so as to be supported at both ends of the filter frame 7a, and the support plate 8a is formed of sheet metal, so that the electrical unit 8 is prevented from being deformed by an external force generated during transportation. be able to. Furthermore, even if an operator may apply an external force to the electrical unit 8 during maintenance, the distance between the electrical unit 8 and the filter frame 7a is not reduced because it is supported by the support plate 8a formed of sheet metal. A certain amount of suction air volume can be reliably secured. Note that the filter frame 7a and the support plate 8a may be connected by screws or may be hooked.

  In the present embodiment, the electrical unit 8 is formed so that the substrate 8c is disposed on the right side of the support plate 8a, and an opening 8g is provided on the left side. Since the support plate 8a is disposed over the entire width of the filter frame 7a, the flow of wind is blocked. For this reason, in this embodiment, by providing the substrate 8c on the right side and providing the opening 8g on the left side to provide a passage through which air passes through the opening 8g, the ventilation resistance can be reduced. It should be noted that even if the arrangement of the substrate 8c and the arrangement of the opening 8g are opposite to each other, there is no problem even if the arrangement of the substrate 8c and the opening 8g is up and down.

  FIG. 7 is a cross-sectional view taken along the line BB, and FIG. As shown in FIGS. 7 and 8, a groove shape 9 is formed along the periphery of the base 8b, and the groove shape 9 is formed by an inner side wall 9a and an outer side wall 9b.

  On the other hand, the cover 8d is provided with a convex shape 10 at a position facing the groove shape 9 so that the cover 8d can be fitted into the groove shape 9. Then, the convex shape 10 is accommodated in the groove shape 9, and the cover 8d is fitted into the base 8b. At this time, it is desirable to fit with no gap, but there is a gap 11 due to a manufacturing error.

  Therefore, in the present embodiment, the flame retardant member 12 is disposed in the fitting portion between the base 8b and the cover 8d. In the present embodiment, an EPT seal is used for the flame retardant member 12 and is soft, that is, has an elastic force. Therefore, when the base 8b and the cover 8d are fitted to each other, a force is applied to fill the gap. The member 12 is deformed.

  In this way, by using the flame retardant member 12 having elasticity between the base 8b and the cover 8d, the gap between the inside and the outside of the electrical unit 8 can be filled, so that foreign matter can be prevented from entering, Furthermore, since it is flame retardant, it is possible to prevent the spread of fire to the outside when it is ignited by the electrical unit.

  Further, the height H1 of the inner side wall 9a forming the groove shape 9 is set higher than the height H2 of the outer side wall 9b. For example, even if a foreign matter enters the groove shape 9 beyond the side wall 9b for some reason, the higher side wall 9a is present, so that foreign matter can be prevented from entering the electrical unit 8.

Further, a sheet metal cover 8e made of sheet metal is attached from above the cover 8d. By providing the sheet metal cover 8e as described above, it is possible to further prevent the fire from the electrical unit 8 from being transmitted to the outside.

  Further, the outside of the sheet metal cover 8e is painted, so that it is possible to prevent injuries due to edges and burrs of the sheet metal during maintenance.

  Moreover, the shape of the cover 8d and the sheet metal cover 8e has a shape along the top surface suction port 2a and the front surface suction port 2b. In the present embodiment, the electrical unit 8 can be housed in a triangular dead space formed by the top surface suction port 2 a and the front surface suction port 2 b and the indoor heat exchanger 5 by adopting a substantially trapezoidal shape.

  FIG. 9A is an enlarged view of a portion C, and FIG. 9B is a diagram viewed from the D direction. As shown in FIG. 9, the cover 8d is provided with a groove 13 into which an end of the sheet metal cover 8e can be inserted. When the sheet metal cover 8e is fitted into the cover 8d, the end of the sheet metal cover 8e is formed into the groove 13. To be inserted into.

  By providing the groove portion 13 in this manner, the edge of the sheet metal cover 8e can be accommodated, and safety during maintenance can be improved.

  Next, attachment of the base 8b and the cover 8d will be described. FIG. 10 is a diagram showing the relationship between the base 8b and the cover 8d.

  As shown in FIG. 10, the cover 8d is connected to the base 8b by a plurality of connection portions 14 so as to rotate, and the plurality of connection portions 14 are provided so that the cover 8d opens upward. That is, the connection part 14 is provided on the upper side of the electrical unit 8.

  Further, the base 8b and the cover 8d are provided with a hook portion on one side on the lower side and a projection portion that is hooked on the hook portion on the other side. In the present embodiment, the hook 8 is provided on the cover 8d, the protrusion 16 is provided on the base 8b, and the protrusion 16 is hooked on the hook 15 so that the lower side of the electrical unit 8 is connected.

  There is no problem if the cover 8d is provided with a protrusion and the base 8b is provided with a hook. However, by adopting the configuration of the present embodiment, only a force is applied in the direction to open the cover 8d. Since the protrusion 16 is detached from the hook 15 and the cover 8d can be rotated in the opening direction, the workability is improved.

  Thus, by setting it as the structure which opens so that the cover 8d may rotate to the upper side, since the indoor unit 1 is installed in the indoor high position, there exists an effect that an operator's work becomes easy at the time of a maintenance.

  Next, the structure of the connection part 14 is demonstrated. FIG. 11A is an enlarged exploded view of the connection portion 14, and FIG. 11B is an enlarged assembly view of the connection portion 14. One of the maintenance is replacement of the substrate 8c. When the substrate 8c is replaced, the work efficiency can be improved by making the structure easy for the operator to work.

  In the present embodiment, as shown in FIG. 11, the connecting portion 14 is configured to be rotatable, and specifically, a shaft is provided on one side and a hole shape is provided on the other side. In the present embodiment, a hole shape 17 is provided in the base 8b, and a shaft 18 is provided in the cover 8d.

Further, the stopper 19 is attached to the shaft 18 after the shaft 18 is inserted into the hole shape 17 so that the shaft 18 does not come out of the hole shape 17. A groove is formed on the shaft 18 so that the stopper 19 can be easily attached, and the stopper 19 can be inserted along the groove. The stopper 19 has a substantially C shape and is inserted into the shaft 18 from the open side.

  FIG. 12A and FIG. 12B are configuration diagrams of the stopper 19. As shown in FIG. 12A, the constriction 20 is provided at two locations on the inner peripheral side of the stopper 19 of the present embodiment. Here, the constriction refers to a portion where the distance L between the inner peripheral side and the outer peripheral side is smaller than other portions.

  This is provided with a plurality of locations where the distance between the outer peripheral side and the inner peripheral side becomes small so that the stopper 19 is easily elastically deformed outward when the stopper 19 is inserted into the shaft 18. In this embodiment, constrictions are provided at two locations, but the present invention is not limited to this. For example, as shown in FIG. 12 (b), the inner peripheral side and the outer peripheral side between two protrusions You may shorten the distance and provide a constriction in one place.

  Further, the direction in which the shaft 18 is inserted into the hole shape 17 in the plurality of connecting portions 14 is the same direction. In this way, workability during maintenance can be improved.

  Thus, even when working the indoor unit 1 installed at a high position, the interior of the electrical unit 8 can be confirmed even from the lower direction by configuring the electrical unit 8 to rotate upward. In addition, the replacement work of the substrate 8c can be facilitated.

  Next, the configuration of the substrate 8c will be described. FIG. 13 is a configuration diagram of the substrate 8c in the first embodiment.

  The indoor unit 1 according to the present embodiment has a structure in which a power cord connected to the AC power supply 131 is drawn from the left end, and the longitudinal direction of the substrate 8c from the side from which the power cord connected to the AC power supply 131 is drawn. The AC block 132, the high-voltage DC block 133, and the low-voltage DC block 134 are arranged in this order along 136. In particular, when the board 8c is realized by a single printed board, the width of the short side direction 135 is reduced by arranging the board 8c in the longitudinal direction, so that the width of the electrical unit can be reduced, and the draft resistance of the sucked air is reduced. Can be small.

  Here, the electrical components arranged on the substrate 8c are configured with a number of circuits that can be noise sources. For example, a switching power supply 137 that generates a control power supply, a high-voltage power supply 138 that realizes an air cleaning action, and the like.

  These achieve each purpose by high-speed switching using switching elements such as FETs, but also have the problem that unnecessary radiation noise is generated by high-speed switching.

  A noise filter 139 is provided in the AC block 132 connected to the AC power supply 131 in order to prevent these unnecessary radiation noises from leaking to the outside. However, since the noise filter 139 performs noise attenuation based on the inherent impedance characteristic depending on the frequency, the noise filter 139 cannot completely block unnecessary radiation noise.

Therefore, in the present embodiment, the GND pattern 140, which is the stable potential of the low-voltage DC block 134, is drawn to the primary side of the noise filter 139 of the AC block 132, is brought close to the primary AC pattern 141 for a certain interval, and further the maximum of the GND pattern 140 is obtained. The tip is connected to the stable potential of the indoor heat exchanger 5 connected to the ground through the insulation impedance 142.

  As a result, a stray capacitance 143 is formed between the primary AC pattern 141 and the GND pattern 140, whereby the primary AC pattern 141 and the GND pattern 140 are coupled at high frequency, and unwanted radiation noise that could not be attenuated by the noise filter 139 is removed. It can be released to a stable potential, and can be realized with a simple configuration without using a special circuit or component.

  In the case where the stable potential is not ground but a metal such as a sheet metal floating from the ground for the purpose of non-combustion of electrical components, the insulation impedance 142 may not be provided.

  As mentioned above, since the air conditioner in this Embodiment can lengthen the length of the horizontal width direction of the indoor heat exchanger 5 by arrange | positioning the electrical equipment unit 8 to the front side, it improves heat exchange capability. In addition, since the electrical unit 8 is disposed in a part of the blower circuit, the cooling effect on the electrical unit 8 can be enhanced, and the electrical unit is also capable of dealing with foreign matters such as dust sucked in from the outside. Therefore, it is possible to provide a highly reliable air conditioner.

  As described above, the present invention is not only an air conditioner in which one indoor unit is connected to one outdoor unit, but also a multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit. Even a machine can be applied.

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Front panel 8 Electrical unit 8a Support plate 8b Base 8c Board 8d Cover 8e Sheet metal cover 8f Terminal block 9 Groove shape 10 Convex shape 131 AC power supply 132 AC block 133 High voltage DC block 134 Low voltage DC block 139 Noise filter 140 GND pattern

Claims (8)

An air conditioner in which an electrical unit is disposed on the front side of an indoor unit, wherein an AC block and a high-voltage direct current are formed on a board disposed in the electrical unit from the connection side of the AC power cord in the longitudinal direction of the electrical unit. An air conditioner comprising a block and a low-voltage DC block, wherein the GND pattern of the low-voltage DC block is brought close to the pattern of the AC block, and the most advanced point of the GND pattern is connected to the ground. The electrical unit includes a base on which a substrate on which electrical components are arranged and a cover for the base are provided. The base is provided with a groove along the periphery, and the cover is fitted in the groove. The air conditioner according to claim 1, wherein a convex shape is provided. The air conditioner according to claim 2, wherein a flame retardant member is disposed between the base and the cover. The air conditioner according to claim 3, wherein the flame retardant member is soft. 5. The air conditioner according to claim 2, wherein an inner side wall is made higher than an outer side wall in both side walls constituting the groove. The air conditioner according to any one of claims 2 to 5, further comprising a sheet metal cover formed of a sheet metal that covers the cover. The air conditioner according to claim 6, wherein an outer surface of the sheet metal cover is painted. The air conditioner according to claim 6 or 7, wherein the cover is provided with an insertion part into which an end of the sheet metal cover can be inserted.