JP2010181095A - Outdoor unit for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent fire spreading to a compressor etc. even if fire occurs from inside of an electrical component box 98. <P>SOLUTION: Electrical components 103 such as an electrolysis condenser and a terminal connection 109 are provided on the bottom of a control circuit board 99, and a radiator 101 coming into contact with a heat generating component arranged at an end of the control circuit board 99 and radiating heat from the heat generating component is provided. An outer frame of the electrical component box 98 is surrounded by a lower cover 97 and an upper cover 96 made of sheet metal. The lower cover 97 includes: a radiator hole 102 from which the radiator 101 is protruded downwardly; and a wire connection hole 108 opposing to the terminal connection 109. A flange 110 for preventing dropping of the electrical components 103 burned when fire occurs from the wire connection hole 108 to outside of the electrical component box 98 is provided around the wire connection hole 108. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a structure of an electrical component box provided in an outdoor unit of an air conditioner.

  In the conventional outdoor unit, as described in Patent Document 1, an electrical component box is built in the outdoor unit. The electrical component box is held by the lower cover. The lower cover is attached to the upper part of the partition plate that partitions the periphery of the compressor. And in order to prevent the aluminum radiator that dissipates heat generated by the inverter driving heat source from falling off due to heat when a fire occurs outside the outdoor unit, the flange is extended in the horizontal direction. Prevents fire from entering the machine room from the heat exchange room. (For example, see Patent Document 1)

JP 2007-85649 A

  In the unlikely event that a fire occurs due to a malfunction of an electronic component or the like that uses plastic materials such as electrolytic capacitors provided inside the electrical component box, the electronic component will burn or melt and fall, and from the connection port to the machine room There was a problem that a spilled fire spreads out and burns even an expensive compressor and other parts provided in the lower part of the machine room.

  The present invention pays attention to this point and solves the above-mentioned drawbacks. In particular, the structure is configured with a machine room including a compressor and an electrical component box, and a heat exchanger including a heat exchanger and a blower fan through a partition plate. An outdoor unit of an air conditioner having an outdoor unit body partitioned into a room and housing a control circuit board on which driving electronic components are mounted in the electrical component box. An electronic component such as an electrolytic capacitor and a terminal connection portion are provided on the bottom surface, and a heat radiator is provided for contacting and dissipating heat from the heat generating component disposed at the end of the control circuit board. The outer frame of the electrical component box Is surrounded by a lower cover and an upper cover made of sheet metal, and the lower cover is provided with a radiator hole in which a radiator protrudes downward and a connection hole facing the terminal connection portion, and around this connection hole in the event of a fire Whether the burned-out electronic component is a connection hole It is provided with a flange to prevent the falling of the electrical component box outside.

According to this invention, when a fire occurs from the inside of the electrical component box due to a malfunction of the electronic component, the burned-out electronic component falls from the connection hole to the outside of the electrical component box, and the fire spreads and is provided at the lower part of the machine room. Even expensive compressors and other parts are prevented from burning out.
In addition, by bending the end face of the flange provided around the connection hole to the outside of the connection hole, there is no risk of injury such as cutting the hand with the flange during connection assembly, and assembly work is facilitated.
In addition, the electronic component in the electrical component box is prevented from overheating due to the ventilation between the connection hole and the ventilation opening during normal operation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Explanatory drawing of the same outline. The exploded perspective view of the freezing circuit room. The disassembled perspective view of the same hot water circuit chamber. The bottom view of the electrical component box. AA sectional drawing of the same FIG. BB sectional drawing of the same FIG.

Next, an outdoor unit of an air conditioner according to the present invention will be described with reference to an embodiment shown in the drawings.
1 is an outdoor unit of an air conditioner, which is divided into two upper and lower chambers by a horizontal partition plate 2, which is provided with a refrigeration circuit chamber 3 at a lower portion and a hot water circuit chamber 4 at an upper portion, and a fan convector by a hot water communication pipe 5. Are connected to the indoor unit 6.
The refrigeration circuit chamber 3 has an air suction port 7 on the rear and left side and a blower port 8 on the front surface. The compressor 9, the evaporator 10, the expansion valve 11, the blower fan 12, and the refrigeration circuit control unit are provided inside. 13 etc. are provided.
The hot water circuit chamber 4 has a water supply lid 14 on the upper surface and a pipe outlet 15 on the rear surface. A refrigerant connection valve 16, a water-refrigerant heat exchanger 17, an auxiliary heater 18, a hot water tank 19, and a circulation pump 20 are provided inside. The hot water header 21 and the hot water circuit control unit 22 are provided.
The compressor 9 can change the rotation speed in multiple stages by an inverter drive circuit (not shown) provided in the hot water circuit control unit 22.

The evaporator 10 is a fin-tube type heat exchanger which is vertically long and has a large number of thin aluminum plates penetrated by a copper tube, and is provided in a row in close contact with the windward and leeward sides. The copper pipes are provided in 24 stages on the top and bottom, and the liquid refrigerant depressurized by the expansion valve 11 flows into the inside, deprives the heat in the air, becomes gas at the outlet of the evaporator 10, and returns to the compressor 9.
Reference numeral 23 denotes a radiator provided between the water-refrigerant heat exchanger 17 and the expansion valve 11, and two copper pipes are arranged on the leeward side of the evaporator 10 from the lower end to the water-refrigerant heat exchange. This unit connects the evaporator 17 and the expansion valve 11, and uses the aluminum thin plate on the leeward side of the evaporator 10, and is formed integrally with the evaporator 10, thereby discharging without using an internal heat exchanger. Since the increase in pressure can be suppressed, the manufacturing cost is kept low. Moreover, the unmelted residue in the defrosting operation can be prevented, and the efficiency of defrosting can be improved. Moreover, since the increase in discharge pressure is suppressed, an increase in power consumption of the compressor 9 can be suppressed, and a high COP can be realized.
The expansion valve 11 is an electronic expansion valve whose opening degree is controlled by the refrigeration circuit control unit 13 according to the rotational speed of the compressor 9, the temperature of each part of the refrigeration circuit, and the like.
The blower fan 12 is a resin propeller fan, and is rotated by a blower motor 24 having a variable number of rotations. The air suction port 7, the evaporator 10, the blower fan 12, and the blower outlet 8 form an outdoor blower path 25 to evaporate. The vessel 10 takes heat from the outside air.

  Reference numeral 26 denotes a sheet metal base on which functional parts such as the compressor 9 and the evaporator 10 are fixed on the upper surface, a drainage groove 26a is provided opposite to the bottom surface of the evaporator 10, and a base drainage is provided at the approximate center of the drainage groove 26a. An outlet 26b is provided for draining water overflowing from the hot water tank 19 to the outside of the appliance during maintenance of defrost water and water supply. A sheet metal front panel 27 has a circular and lattice-shaped air outlet 8 on the left side of the center and is covered with a resin air outlet cover 28. 29 is a sheet metal right side plate, which is bent in an L shape from the right side to the back side, and a service port 30 for connecting a wire such as a connecting wire or a power cord (not shown) is opened at the top, which also serves as a handle. The lid 31 is closed.

  32 is a left side plate made of sheet metal, which is bent into an L-shape from the left side surface to the back side. A large number of square holes 33 are used as the suction port 7, and a resin handle 34 is attached to the upper end portion of the square hole 33. ing. Further, since the corner portion 32a of the left side plate 32 is not provided with the square hole 33, the left side plate 32 is hardly affected by the sucked air.

  Reference numeral 35 denotes a support fitting having a U-shaped plane cross section, which is provided on the inner side of the right side plate 29, and has a lower end screwed to the base 26 and an upper end screwed to the horizontal partition plate 2 so that the upper hot water The circuit chamber 4 is supported. Reference numeral 36 denotes a left and right partition plate that separates a heat exchange chamber 37 that forms the outdoor ventilation passage 25 on the left side and a machine room 38 that includes the compressor 9 and the like. 39 is screwed. Reference numeral 40 denotes a motor mounting base for fixing the blower motor 24, and the lower end is fixed to the base 26 and the front of the upper end is fixed to the front panel 27. 41 is an evaporator left fastener for fixing the upper left end of the evaporator 10. 42 is an evaporator center fastener for fixing the substantially upper center of the evaporator 10.

  Reference numeral 43 denotes a radiator inlet pipe having a lower end connected to the radiator 23 and an upper end connected to the refrigerant connection valve 16. An evaporator inlet pipe set 44 connects the expansion valve piping set 45 and the inlet side of the evaporator 10. An evaporator outlet pipe set 46 connects the outlet side of the evaporator 10 and the four-way valve piping set 47. Although the four-way valve piping set 47 is not shown in FIG. 2, the four-way valve 48 is used for service work such as refrigerant recovery by moving equipment or the like. 49 is an earth leakage breaker which is attached to the power source side of the refrigeration circuit control unit 13.

The indoor unit 6 is composed of a fan convector and the like. The indoor unit 6 is provided with a warm air outlet 50 at the lower front portion, an operation unit 51 at the upper front portion, an air inlet (not shown) and the like on the rear surface, and heat inside. An indoor heat exchanger 52, an indoor blower fan 53, an indoor control unit 54, and the like for discharging are provided.
Reference numeral 55 denotes an indoor warm water connection portion for connecting the indoor unit 6 such as a warm water outlet and the warm water communication pipe 5.

  The water-refrigerant heat exchanger 17 is composed of a double pipe having an inner pipe inserted into the outer pipe. The outer surface of the inner pipe is configured so that a large number of fins are erected to increase the heat exchange efficiency inside and outside the inner pipe. Heat is exchanged between the refrigerant and water by using a hot water path 56 through which water passes inside the inner pipe of the double pipe and a refrigerant path 57 through which refrigerant passes between the inner pipe and the outer pipe. It is possible to heat the passing water.

The refrigerant path 57 and the refrigerant connection valve 16, the radiator 23, the expansion valve 11, the evaporator 10, the compressor 9, and the refrigerant connection valve 16 are sequentially communicated by refrigerant piping to form a refrigerant circulation circuit 58.
Further, the warm water path 56, the auxiliary heater 18, the warm water tank 19, the circulation pump 20, the warm water header 21, the warm water communication pipe 5, the indoor warm water connection section 55, the indoor heat exchanger 52, the indoor warm water connection section 55, and the warm water communication pipe 5 are used. Are sequentially communicated through a hot water pipe to form a hot water circulation path 59.

  The upper surface of the refrigeration circuit chamber 3 is covered with a horizontal partition plate 2 on which the hot water circuit chamber 3 is formed. The outer frame on the front side of the hot water circuit chamber 3 is formed on the front panel 60 made of sheet metal, the right side is formed on the right side plate 61, the left side to the back is formed on the left side plate 62, and the upper surface is formed by the top plate 63. The top plate 63 is provided with a hole 64 that is closed by the water supply lid 14, and a pipe cover 65 including the pipe outlet 15 is attached to the right side of the back surface.

  A valve mounting base 66 for mounting the refrigerant connection valve 16 is screwed to the right front side of the horizontal partition plate 2, the hot water header 21 is attached to the back side thereof, and the hot water communication pipe 5 is connected. A header fitting 67 that forms a space is screwed.

From the center to the left corner of the horizontal partition plate 2, a water-refrigerant heat exchanger 17 that is covered up and down by an insulating material bottom 68 and an insulating material top 69 made of styrene foam is disposed. Is provided with a hot water tank 19, and a cap 71 is attached to a water supply port 70 on the upper surface of the hot water tank 19. Around the water supply port 70, there is provided a water receiving groove 70a for receiving water overflowing when water is supplied for installation work or repair service.
The side wall 69a is connected upward from the left end of the heat insulating material 69, the front wall 69b on the front surface and the back wall 69c on the back surface are formed, and the hot water tank 19 is positioned inside these walls. . The water overflowing from the water supply port 70 passes from the water receiving groove 70a between the left side surface of the hot water tank 19 and the side wall 69a of the heat insulating material 69 (longitudinal drainage channel 70b), and is provided with a heat insulating material horizontally long below the side wall 69a. It flows into the guide path 69d, is led to a heat insulating material drain port 69e provided at the back of the heat insulating material guide path 69d, and is drained downward.
Further, a horizontal partition plate drain port 2a is provided at the left rear corner of the horizontal partition plate 2 below the heat insulating material drain port 69e, and a bent portion 10a of the evaporator 10 is provided below the horizontal partition plate drain port 2a. Is located.

  The auxiliary heater 18 is screwed to the horizontal partition plate 2 on the right side of the hot water tank 19, and the circulation pump 20 is screwed between the auxiliary heater 18 and the header fitting 67. Above the auxiliary heater 18, the hot water circuit control unit 22 is fitted in an edge 72 provided in the front and back of the upper portion of the heat insulating material 69. In the hot water circuit control unit 22, a circuit board 74 is housed in an electrical equipment box 73, and the upper surface is closed by an electrical equipment lid 75.

  Reference numeral 76 denotes a resin-made hydrothermal exchange outlet hose that connects the outlet of the water-refrigerant heat exchanger 17 and a copper pipe heater inlet pipe 77. The heater inlet pipe 77 is attached to a connection port (not shown) provided on the left side surface of the auxiliary heater 18. A heater outlet pipe 78 is connected to the upper right surface of the auxiliary heater 18 and is connected to the tank inlet hose 79. The tank inlet hose 79 is connected to a tank inlet 80 provided below the right side surface of the hot water tank 19. A tank outlet hose 82 is connected to the tank outlet 81 of the hot water tank 18 and the inlet (not shown) of the circulation pump 20. A pump outlet hose 83 is connected to the circulation pump outlet 84 and the header joint upper 85, and warm water is sent from the upper side of the warm water header 21 to the indoor unit 6.

  Reference numeral 86 denotes a discharge temperature sensor attached to the refrigerant pipe on the discharge side of the compressor 9, which measures the discharge temperature of the compressor 9 and sends a signal to the refrigeration circuit control unit 13. 87 is an outside air temperature sensor provided on the upstream side of the outdoor ventilation path 25 in the refrigeration circuit chamber 3, and measures the outside air temperature. Reference numeral 88 denotes a heat exchange sensor that is attached to the evaporator 10 and measures the temperature of the evaporator 10 to control the defrosting operation. Reference numeral 89 denotes a refrigerant intermediate sensor that is attached in the middle of the water-refrigerant heat exchanger 17 and measures the temperature of the refrigerant.

  Reference numeral 90 denotes an outgoing hot water sensor which is attached to a hot water pipe between the water-refrigerant heat exchanger 17 and the auxiliary heater 18 and measures the pipe temperature. A heater hot water sensor 91 is attached to a hot water pipe between the auxiliary heater 18 and the hot water tank 19 and measures the pipe temperature. A return hot water sensor 92 is attached to a hot water pipe between the indoor unit 6 and the water-refrigerant heat exchanger 17 and measures the pipe temperature.

  Reference numeral 93 denotes a safety thermo that detects overheating of the auxiliary heater 18, and two are attached to the upper surface of the auxiliary heater 18. A water level sensor 94 detects the water level of the hot water tank 19 with two electrodes attached to the hot water tank 19. A bypass pipe 95 connects between the circulation pump 20 and the hot water header 21 and between the other hot water header 21 and the return hot water sensor 92, and adjusts the amount of hot water circulating to the indoor unit 6.

  The refrigeration circuit control unit 13 is made of sheet metal and is formed by an electrical component box 98 composed of an upper cover 96 and a lower cover 97, and a control circuit board 99 inside the electrical component box 98, and most of the refrigeration circuit control unit 13 is divided into a machine room 38 and left and right partitions. It is located at the upper part of the plate 36 and a part thereof is provided protruding from the upper part of the heat exchange chamber 36. The control circuit board 99 is attached to a rectangular thin plate-like pattern board with a large transistor 100 for driving the compressor 9 and generating a large amount of heat, and a radiator 101 for cooling the large transistor 100 is attached in contact with the large transistor 100. It has been.

  The control circuit board 99 is mounted on the back surface of the upper cover 96 with a distance of about 10 mm, and the solder surface is mounted on the upper side. The radiator 101 is made of fin-like aluminum and has a radiator hole provided in the lower cover 97. The heat exchange chamber 23 is projected through the lower heat exchange chamber 102, and exhausted into the heat exchange chamber 23 by the air blown from the heat exchange chamber 23. Reference numeral 103 denotes an electronic component attached to the bottom surface of the control circuit board 99 by soldering or the like. Three electrolytic capacitors 104, a switching transformer 105, a current transformer 106, and a line filter 107 are provided at approximately the center of the control circuit board 99. Etc.

  Reference numeral 108 denotes a connection hole provided from the front surface to the bottom surface of the lower cover 97. The lead wire terminals taken out from the sensors, the compressor 9, the blower motor 24 and the like are connected to the terminal connection portion 109 provided in the control circuit board 99. A flange 110 having a height of about 10 mm is provided around the connection hole 108, and a fire occurs in the electrical component box 98 and the electronic component 103 is burned out and falls off the control circuit board 99. Even in this case, the fire stays in the electrical component box 98 without jumping out from the connection hole 108, and the fire is prevented from spreading to the compressor 9 and the like located below the electrical component box 98. For this reason, the electronic component 103 that may drop off due to a fire is arranged except for a portion facing the connection hole 108, and a terminal connection portion 109 is arranged in a portion facing the connection hole 108.

  Further, if the flange 110 is machined by rounding or turning the end portion outside the connection hole 108 so that the operator is not injured during the connection operation, the operation can be facilitated.

  111 is a vent hole provided on the back surface of the electrical component box 98, and is a horizontally long hole consciously provided at the engaging portion of the upper cover 96 and the lower cover 97, and is provided in two places in the left-right direction. During operation, as shown by a wavy arrow in FIG. 5, an air passage 112 through which air introduced from the vent 111 flows toward the connection hole 108 is formed to prevent overheating of the electronic component 103 in the electrical component box 98. It is.

  Explaining the refrigeration circuit, the high-temperature refrigerant discharged from the compressor 9 located in the machine chamber 38 passes through the refrigerant circulation valve 16 and is configured in a double pipe structure provided in the hot water circuit chamber 4. In the water-refrigerant heat exchanger 17, heat exchange is performed between the hot water passages 56 in contact with the refrigerant passages 57, and the water in the hot water passages 56 is heated by the high-temperature refrigerant. After releasing heat in the refrigerant path 57 and liquefying the refrigerant, the refrigerant passes through the other refrigerant circulation valve 16 and dissipates heat in the radiator 23 of the refrigerant circuit chamber 3 to reduce the internal pressure and then expand. After returning to the valve 11, the pressure is reduced and the evaporator 10 takes heat from the blown air and the refrigerant is vaporized. Then, the refrigerant is returned to the compressor 9 and the circulation of the refrigeration cycle is continued.

  Explaining the hot water circuit, the hot water heated by the water-refrigerant heat exchanger 17 is further heated by the auxiliary heater 18 during the defrosting operation or when the capacity of the refrigeration circuit is insufficient, and the temperature required in the hot water tank 19 is reached. Of hot water is stored. The warm water in the warm water tank 19 passes through the warm water header 21 and the warm water communication pipe 5 by the circulation pump 20 and is sent to the indoor heat exchanger 52 of the indoor unit 6, and heat is released into the room as warm air by the indoor blower fan 53. The hot water circulating through the other hot water communication pipe 5 and the hot water header 21 is circulated through the water-refrigerant heat exchanger 17. Moreover, in order to adjust the amount of hot water circulation to the indoor unit 6, some hot water circulates on the bypass pipe 95 side.

In addition, when a fire occurs from the inside of the electrical component box 98 due to a failure of the electronic component 103, the burned-out component falls from the connection hole 108 to the outside of the electrical component box 98, and the fire spreads and is provided at the lower part of the machine room 38. This prevents the expensive compressor 9 and other parts from being burned out.
By bending the end face of the flange 110 provided around the connection hole 108 to the outside of the connection hole, there is no risk of injury such as cutting the hand with the flange 110 during connection assembly, and the assembly work is facilitated.
The electronic component 103 in the electrical component box 98 is prevented from being overheated by the ventilation between the connection hole 108 and the ventilation port 111 during normal operation.
Further, the upper surface side, which is the soldering surface of the control circuit board 99, is almost sealed by the control circuit board 99 and the upper cover 96, thereby preventing the invasion of pests such as centipedes that cause a failure or a fire. ing.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 9 Compressor 13 Refrigeration circuit control part 36 Left and right partition plate 37 Heat exchange chamber 38 Machine room 96 Upper cover 97 Lower cover 98 Electrical component box 99 Control circuit board 101 Radiator 103 Electronic component 108 Connection hole 109 Terminal connection Part 110 Flange 111 Vent 112 Air passage

Claims (2)

  It has an outdoor unit body that is partitioned into a machine room including a compressor and an electrical component box and a heat exchange chamber including a heat exchanger and a blower fan via a partition plate, and is driven into the electrical component box. In an outdoor unit of an air conditioner in which a control circuit board on which electronic components are mounted is housed, an electronic component such as an electrolytic capacitor and a terminal connection portion are provided on the bottom surface of the control circuit board, and the control circuit board A heat radiator that contacts the heat-generating component disposed at the end and dissipates heat from the heat-generating component is provided, and the outer frame of the electrical component box is surrounded by a sheet metal lower cover and an upper cover. A radiator hole that protrudes downward and a connection hole that faces the terminal connection part are provided, and a flange is provided around the connection hole to prevent the electronic parts that have been burned out in the event of a fire from falling out of the connection hole. Air conditioner outdoor unit installed   The outdoor unit for an air conditioner according to claim 1, wherein a vent hole is provided on a back surface of the electrical component box, and an air passage is formed by the vent hole and a connection hole.

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