JPH051832A - Inverter device and air-conditioner using it - Google Patents

Abstract

PURPOSE:To build an integrated inverter device into a thin and narrow shape to reduce the occupational space and area of an air-conditioner. CONSTITUTION:A wiring circuit molded board 1 having a nearly square shape consists of a plate-like circuit pattern that allows a large electric current and is covered with a molding resin layer. Electric parts 2 including large-sized electric parts that deal with large electric currents are two-dimensionally arranged on the wiring circuit molded board 1. The wiring circuit molded board 1 is arranged on the bottom face of a unit, a control board 3 on the side face and an air duct 6, that has built-in radiation fins to release heat of an inverter module 4, on the top face. Therefore, an integrated inverter device is formed into nearly a cube. This cubic inverter device increases the degree of free- arrangement of the inverter device inside an outdoor unit of an air-conditioner, so that the width of the outdoor unit can be narrowed and its occupational space and area can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device built in an outdoor unit of an air conditioner, and more particularly to an inverter device having electric components mounted on a board and an air conditioner using the same. .

[0002]

2. Description of the Related Art As shown in FIG. 8, an air conditioner comprises an indoor unit 100 and an outdoor unit 101, which are connected by a refrigerant pipe 102. The outdoor unit 101 generally includes an inverter device 103, a compressor 104, a heat exchanger 105,
The propeller fan 106 and the motor 107 are provided, and the compressor 104 and the heat exchanger 105 form a refrigeration cycle together with the heat exchanger 108 of the indoor unit 100 and the refrigerant pipe 102. The heat exchanger 108 releases the heat of the refrigerant during heating into the room and causes the refrigerant to absorb the heat inside the room during cooling. The refrigerant cooled or warmed in this way is supplied to the refrigerant pipe 102.
Is sent to the outdoor unit 101 via. In the outdoor unit 101,
The compressor 104 is driven and controlled by the inverter device 103, and the propeller fan 106 drives the motor 107.
The external air passes through the heat exchanger 105 by the rotation of the propeller fan 106. Refrigerant pipe 1
The refrigerant passing through 02 passes through the heat exchanger 105 by the operation of the compressor 104. At this time, in the heat exchanger 105, the refrigerant cooled in the heat exchanger 108 at the time of heating absorbs the heat of the outside air to be warmed, and at the time of cooling, the heat The refrigerant heated by the exchange 108 releases heat to be cooled. This refrigerant is the refrigerant pipe 102
To the heat exchanger 108 of the indoor unit 100.

As described above, the refrigerant is circulated between the indoor unit 100 and the outdoor unit 101 to perform heating and cooling.

FIG. 9 shows an inverter device 103 in FIG.
FIG. 1 is a circuit configuration diagram showing an example of the above, wherein 109 is a commercial AC power supply, 110 is a DC power supply unit, 111 is an inverter unit, 11
Reference numeral 2 is a compressor motor, 113 is a control unit, 114 is a noise filter, 115 is an LC filter, 116 is a voltage doubler rectifier circuit, and 117 is a current detection resistor.

In FIG. 1, the inverter device is composed of a DC power supply unit 110, an inverter unit 111, and a control unit 113. The commercial AC power supply 109 is an indoor outlet or the like, and commercial AC voltage from this is the DC power supply unit 110.
Applied to. In the DC power supply unit 110, a DC voltage is generated from this commercial AC voltage by the voltage doubler rectifier circuit 116 and applied to the inverter unit 111. The noise filter 114 is for removing the noise superimposed on the commercial AC voltage, and the LC filter 115 is for improving the strain. The inverter unit 111 forms a three-phase drive current based on the DC voltage and the control signal from the control unit 113, whereby the compressor 104 of the outdoor unit 101 is formed.
The compressor motor 112 that drives (FIG. 8) is rotated.
The control unit 113 detects the rotational position of the compressor motor 112 and generates a control signal in response to the detected rotational position.
The load fluctuation of the compressor motor 112 is detected by the current flowing in 17, and the rotation speed of the compressor motor 112 is controlled according to this load fluctuation.

In the above air conditioner, in the inverter device as shown in FIG. 9, the inverter unit 111 is conventionally modularized, and the control unit 113 is mounted on the circuit board. 1 with 110
The outdoor unit 1 is unitized by being housed in one case, and as shown in FIG.
It is incorporated in 01.

[0007]

By the way, in the unitized inverter device, the DC power supply unit 110 occupies a very large space in the case, for example, 2/3 times the space. This is because the current flowing through the DC power supply 110 is as large as about 20 amps, and
The electric components used also include, for example, the voltage doubler rectifier circuit 116.
Large-sized ones such as diodes and large-capacity electrolytic capacitors as smoothing capacitors,
This is because conventional circuit boards cannot be used with a small capacity, and electric parts must be connected with electric wires.

Further, since the outdoor unit of the air conditioner has been made thinner in terms of space, it is necessary to make the unitized inverter device thinner. Since a space other than an electric component such as a space for the electric power source is required, the large electric component of the DC power supply unit 110 is arranged in a straight line. Therefore, even if the inverter device can be thinned, , The unit had a rectangular parallelepiped with a rectangular bottom, and was wide laterally.

As shown more specifically in FIG. 8 as shown in FIG. 8 (note that FIG. 10 (a) is an internal structural view seen from the front, and FIG. 10 (b) is taken from the alternate long and short dash line in FIG. 10 (a). Arrow A
In the conventional outdoor unit 101, the inverter device 103 and the compressor 104 are arranged on one side of the inside, and the propeller fan 106, the motor 107, and the heat exchanger 105 are on the other side of the inside. The inverter device 103 is disposed above the compressor 104. Therefore, when the inverter device 103 has a rectangular parallelepiped shape as described above, the outdoor unit 101 itself becomes wide laterally, and even if it can be made thin, it spreads laterally.
The space reduction effect is not sufficient. On the other hand, it is conceivable to reduce the space of the propeller fan 106, the heat exchanger 105, and the like, and the outdoor unit 101 can be downsized by this, but the heat exchanger 105 becomes smaller and the air conditioner becomes smaller. Will lose its ability.

An object of the present invention is to solve the above problems and to provide an inverter device which can be made smaller and thinner, and an air conditioner using the same.

[0011]

In order to achieve the above-mentioned object, the present invention provides a circuit for handling a large current, in which a wiring circuit molded substrate formed by coating a plate-shaped circuit pattern with a molding resin layer has a substantially square shape. The electrical components forming the are arranged on the printed circuit board and the overall shape is substantially cubic.

[0012]

The plate-shaped circuit pattern has a capacity for flowing a large current, and the plate-shaped circuit pattern connects between the electric parts in the circuit that handles a large current. For this reason, it is not necessary to use a conventional wire connection, and the space can be spared by this amount, and the electric parts can be arranged in this space. Therefore, instead of the linear (that is, one-dimensional) arrangement of the conventional large-sized electric component, the two-dimensional arrangement becomes possible. Therefore, the electric component can be arranged on the substantially square wiring circuit molded board. A circuit that handles a large current can be configured, and the inverter device can be formed into a substantially cubic unit having a narrower width than the conventional one.

When the overall shape of the inverter device is substantially cubic as described above, the outdoor unit of the air conditioner has a smaller width than that of the conventional one, and the size is further reduced while maintaining the thinness.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an internal configuration of an embodiment of an inverter device according to the present invention, in which 1 is a printed circuit board,
2 is an electric component, 3 is a control board, 4 is an inverter module, 5 is a reactor, 6 is a ventilation duct, and 7 is a terminal block.

In FIG. 1, the printed circuit board 1 has a substantially square shape and has a plate-shaped circuit pattern inside. A large-capacity and large-sized electric component 2 is arranged on the printed circuit board 1. The circuit pattern in the printed circuit board 1 and the electric component 2 are the DC power supply unit 11 in FIG.
0, this circuit pattern can carry a large current of, for example, 20 amps, and the DC power supply unit 110
The electric parts 2 are connected to each other. In addition, the reactor 5
Is the reactor of the LC filter 115 in FIG.
It is placed outside the case of the inverter device.

The printed circuit board 1 is placed on the bottom of the case, and the controller 1 shown in FIG.
A control board 3 which constitutes 13 is arranged. Further, on the upper surface of the case, there is provided a ventilation duct 6 for passing outside air from one side surface side of the case to the other side surface side opposite to the side surface side as shown by a thick arrow. (Not shown) is built in. On the lower surface of the ventilation duct 6, the inverter module 4 which is in contact with the heat radiation fin and constitutes the inverter unit 111 of FIG. 8 is attached, and the heat generated in the inverter module 4 is released by the heat radiation fin. The terminal block 7 is a terminal for connecting an electric wire or the like for supplying the commercial AC voltage of the indoor commercial AC power supply 109 in FIG. 8 to the inverter device.

According to the unitized inverter device, since the printed circuit board 1 has a substantially square shape, the bottom surface of the unit also has a substantially square shape, and therefore the overall shape also has a substantially cubic shape. Incidentally, as an example of the dimensions of such a unit, the width x = 170 mm, the depth y = 140 mm, the height h = 185 mm, the volume is 4,4 liters, and the unit is small and has a substantially cubic shape.

FIG. 2 is a perspective view showing each part of FIG. 1 in a separated manner. Here, the case is composed of two parts, that is, the cases 8a and 8b, and the case 8a is composed of a bottom surface and two side surface portions. The case 8b has an upper surface portion and one side surface portion. In the case 8a, the wiring circuit molded board 1 is mounted on the bottom surface thereof, and the control board 3 is mounted on one side surface thereof, and in the case 8b, the ventilation integrated with the inverter module 4 (FIG. 1) is mounted on the top surface thereof. Duct 6
Can be installed.

FIG. 3 shows an example of a circuit pattern on the printed circuit board 1. In the same figure, 9a is a lower molding resin layer, and the circuit pattern 10 is covered with this and an upper molding resin layer 9b as shown in FIG. The circuit pattern 10 is made of copper or a conductive metal, and has a pattern width of 4 mm or more and a pattern thickness of 0.5 mm or more so that the resistance value becomes small so as not to generate heat even when a large current is applied. Is set to. The outer dimensions of the printed circuit board 1 are 145 mm in the X direction and 130 mm in the Y direction in FIG. 1, and are arranged on the bottom surface of the case 8a. In such a printed circuit board 1, the circuit pattern 10 integrally formed in advance is fixed in a mold, and the upper and lower molding resin layers 9a and 9b are formed by injection molding.
It is formed by removing unnecessary portions of 0 by making holes in the substrate.

As shown in FIG. 4, the wiring circuit molded board 1 is provided with connection terminals 11 that are bent at the ends of the circuit pattern 10 and project outward from the upper molding resin layer 9b. , On the upper molding resin layer 9b,
A rib 12 for fixing the large electric component 2 is formed. Through holes 14 into which the terminals 13 of the electric component 2 are fitted are provided in the portions where the ribs 12 are formed, and the terminals are formed by solder lands formed on the molding resin layer 9a side below the through holes 14. The terminal 13 and the circuit pattern 10 are soldered at 15.

FIG. 5 shows an embodiment of an outdoor unit of an air conditioner in which the above inverter device is incorporated.
Reference numeral 5 is an inverter device, and parts corresponding to those in FIG.

In this embodiment, like the conventional example shown in FIG. 10, the inverter device 15 is arranged above the compressor 104. According to this, since the inverter device 15 has a substantially cubic shape, the width is narrower and smaller than the outdoor unit 101 of FIG. 10 using the rectangular parallelepiped inverter device 103. Therefore, the outdoor unit using this embodiment has a narrower width and a volume of about 20 to 30% smaller than the conventional outdoor unit shown in FIG.

FIG. 6 shows the compressor 104 with the propeller fan 10
6 shows another embodiment of the outdoor unit of the air conditioner according to the present invention, which is arranged below the motor 6 and the motor 107, and the inverter device 15 is arranged beside the compressor 104. FIG. 7 is a perspective view of this embodiment, and 17 is a front cover.

In this embodiment, since the devices are arranged as described above, the height is higher, but the width is narrower than that of the embodiment shown in FIG. Can be made smaller. Incidentally, in this embodiment, the width is 600 mm, the depth is 185 mm, and the height is 650 mm.
And the volume could be 72 liters. In addition,
In this embodiment, as shown by the arrow in FIG. 7, the outside air is sucked in from the back surface and discharged from both side surfaces.

The present invention is not limited to the circuit example shown in FIG. 10, and the circuit pattern on the wiring circuit molded substrate and the arrangement of electric parts on the wiring circuit molded substrate are shown in FIG. It is not limited to those shown in FIGS.

[0026]

As described above, according to the present invention,
Large electrical components can be arranged two-dimensionally using a substantially square wiring circuit molded board, so even if the depth and height of the unit are the same as the conventional one, the width of the unit is significantly larger than that of the conventional one. It becomes a substantially cubic shape that can be shortened to, and can be downsized. Further, since the size is substantially cubic and the size is small in this way, the degree of freedom of arrangement in the air conditioner is increased, and the space and area occupied by the air conditioner can be further reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of an inverter device according to the present invention.

FIG. 2 is a perspective view showing each main part of FIG. 1 separately.

FIG. 3 is a plan view showing an example of a circuit pattern on the printed circuit board shown in FIG.

FIG. 4 is a diagram showing a mounting state of electric components on the printed circuit board in FIG.

5 is a diagram showing an embodiment of an air conditioner according to the present invention using the inverter device shown in FIG.

6 is a diagram showing another embodiment of the air conditioner according to the present invention using the inverter device shown in FIG.

FIG. 7 is a perspective view of the embodiment shown in FIG.

FIG. 8 is a perspective view showing a configuration of an air conditioner.

FIG. 9 is a circuit configuration diagram showing an example of an inverter device.

FIG. 10 is a diagram showing an arrangement example of inverter devices in a conventional air conditioner.

[Explanation of symbols]

1 Wiring circuit molding board 2 electrical components 3 control board 4 Inverter module 6 ventilation ducts 8a, 8b case 9a, 9b Molded resin layer 10 circuit patterns 15 Inverter device of the present invention 101 Air conditioner outdoor unit 103 Conventional inverter device 104 compressor 105 heat exchanger 106 propeller fan 107 motor

Claims (5)

[Claims] 1. An inverter device having a large electric component for handling a large current, wherein each component is housed in the same case and unitized, and a plate-shaped circuit pattern of copper or conductive metal is formed by a molding resin layer. An inverter device characterized in that a large-sized electric component for handling the large current is arranged on a covered substantially square wiring circuit molded substrate, and the overall shape is a substantially cubic shape. 2. The inverter device according to claim 1, wherein a ventilation duct having a heat radiation fin therein is provided on one inner wall surface of the case. 3. An air conditioner in which a compressor is arranged on the side of a heat exchanger and a fan that sucks the outside air to send the outside air to the heat exchanger, and the compressor is arranged above the compressor. An air conditioner comprising the described inverter device. 4. An air conditioner in which a compressor is arranged below a heat exchanger and a fan sucking the outside air to send the outside air to the heat exchanger, and the air conditioner is provided on the side of the compressor. An air conditioner comprising the described inverter device. 5. The air conditioner according to claim 4, wherein the outside air is sucked in from a back surface and discharged from a side surface.