JP4538962B2 - Electric circuit board and air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric circuit board, and more particularly to an electric circuit board used for an air conditioner.
[0002]
The present invention also relates to an air conditioner, and more particularly, to an air conditioner including an electric circuit board disposed in an outdoor unit.
[0003]
[Prior art]
In a separate type air conditioner composed of an indoor unit and an outdoor unit, when a signal (operation mode, set room temperature, etc.) from the remote control is received by the indoor unit, the signal is sent to the outdoor unit via an electric cable. To the control board. The control board controls the refrigerant circuit based on the received signal (operation mode, set room temperature, etc.), and cool air or warm air is supplied from the indoor unit to the room. Further, the temperature of the cold air or the warm air is adjusted so that the room temperature becomes the set room temperature.
[0004]
In such an air conditioner, an electric circuit board having a terminal portion to which an electric cable from a commercial power source and an indoor unit is connected is used. The circuit board is also electrically connected to the control board, and the control board is electrically connected to the commercial power source and the indoor unit. The terminal section is equipped with a terminal plate that is electrically connected to the conductor wiring and a washer that is screwed to the terminal plate. The tip of the electric cable is inserted between the terminal plate and the washer, and the washer is screwed. Thus, the electric cable is fixed to the terminal portion.
[0005]
[Problems to be solved by the invention]
When the tip of the electric cable is inserted between the terminal board and the washer, it is not possible to see how much the tip is inserted. Therefore, the insertion of the electric cable may not be sufficient, and the screwing of the washer may be loosened, or the electric contact between the electric cable and the terminal portion may be poor.
[0006]
The subject of this invention is ensuring the connection of the cable to an electrical circuit board in an air conditioner.
[0007]
[Means for Solving the Problems]
An electrical circuit board according to a first aspect is an electrical circuit board in which an electric cable is attached to an end portion by a washer, and includes a conductor wiring and a resin member. The conductor wiring is formed of a thin metal plate. The resin member is integrally formed with the conductor wiring, and a groove is formed at the end, and a terminal plate to which the electric cable is attached by a washer is provided in the groove. Further, a part of the groove extends inward from the washer and can accommodate the tip of the electric cable. Further, the resin member has a groove formed extending inward from the washer only at both end portions of the washer, and a connection hole electrically connected to the terminal plate via the conductor wiring is formed in the central portion. ing.
[0008]
In the electrical circuit board according to claim 1, the tip of the electric cable is inserted under the washer disposed in the groove formed in the end portion of the resin member, and the cable tip extends to the groove portion extending inward from the washer. Plugged in. Here, the tip of the cable is visually recognized from above the washer, and in this state, the washer is screwed to fix the tip of the cable with the washer.
[0009]
According to the electrical circuit board according to claim 1, it is confirmed that the end of the cable is inserted into the groove formed to extend inside the washer, and the cable is fixed in a state where the cable is sufficiently inserted under the washer. Can be.
[0010]
Further, no groove is formed in the central portion inside the washer, and the washer is supported by this portion, so that the washer can be easily screwed. Moreover, the lead | read | reed from an inspection jig | tool can be inserted in a connection hole, and the conduction | electrical_connection confirmation and driving | operation inspection of a terminal board and an electric cable can be performed.
[0011]
An air conditioner according to a second aspect includes an indoor unit, a refrigerant pipe, an outdoor unit, a control plate, and an electrical path plate. The indoor unit exchanges heat between indoor air and the refrigerant, and supplies cool air or warm air into the room. One end of the refrigerant pipe is connected to the indoor unit and can circulate the refrigerant. The outdoor unit is connected to the other end of the refrigerant pipe, constitutes a refrigerant circuit together with the indoor unit and the refrigerant pipe, and supplies the compressed or decompressed refrigerant to the indoor unit via the refrigerant pipe. The control plate controls the refrigerant circuit. The electrical circuit board according to claim 1, wherein the electrical circuit board is electrically connected to the control board, the indoor unit, and the commercial power source.
[0012]
According to the air conditioner pertaining to the second aspect , it is possible to obtain the same effect as that of the electrical circuit board pertaining to the first aspect .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
〔overall structure〕
FIG. 1 is a block diagram showing a schematic configuration of an air conditioner according to an embodiment of the present invention. As shown in FIG. 1, the air conditioner of the present invention includes a refrigerant circuit 1, a drive circuit 2, and a control circuit 3. The control circuit 3 controls the refrigerant circuit 1 and the drive circuit 2, drives the refrigerant circuit 1 by the output from the drive circuit 2, controls the refrigerant flow in the refrigerant circuit 1, and adjusts the room temperature.
[0014]
A specific configuration of the refrigerant circuit 1 is shown in FIG. The refrigerant circuit 1 is connected to a compressor 11, a four-way switching valve 12 connected to the discharge side of the compressor 11, an outdoor heat exchanger 13 connected to the four-way switching valve 12, and an outdoor heat exchanger 13. The pressure reducer (electric expansion valve) 14, the indoor heat exchanger 15 connected to the pressure reducer 14, and an accumulator 16 are provided. The compressor 11, the four-way switching valve 12, the outdoor heat exchanger 13, the decompressor 14, and the accumulator 16 are provided in the outdoor unit, and the indoor heat exchanger 15 is provided in the indoor unit. The outdoor unit and the indoor unit are each provided with a fan for supplying an air flow to the outdoor heat exchanger 13 and the indoor heat exchanger 15.
[0015]
The compressor 11 is a device that sucks refrigerant from the suction side, compresses the refrigerant, and discharges the compressed refrigerant from the discharge side. The four-way switching valve 12 has four pipe connections (A, B, C, D), and the pipes connected to each are between AB and CD (solid line) or between AD. -It is a device that conducts between B and C (dotted line) and changes the flow path. The outdoor heat exchanger 13 is formed in an L shape in plan view by folding the refrigerant pipe. The reason why it is L-shaped in plan view is to increase the contact area with the airflow. The decompressor 14 is a device that decompresses and discharges the refrigerant. For example, an electric expansion valve is used. The indoor heat exchanger 15 includes a plurality of plate-like fins arranged in parallel and a refrigerant pipe penetrating them. In order to increase the efficiency of heat exchange between air and the refrigerant, the fins are made of a material having good thermal conductivity such as aluminum, and a plurality of fins are arranged in parallel to increase the contact area with the air. . The accumulator 16 is connected to the suction side of the compressor 11 and is a device for preventing the liquid refrigerant from being mixed into the compressor 11.
[0016]
The configuration of the drive circuit 2 that drives the refrigerant circuit 1 is shown in FIG. The drive circuit 2 mainly includes a rectifier circuit 21 and an inverter 22. The rectifier circuit 21 is composed of a diode bridge, a large-capacity aluminum electrolytic capacitor, and the like, and the input side is connected to the commercial power supply 20. The inverter 22 is a bridge circuit composed of power elements such as FETs and IGBTs, and is driven by a drive signal from the control circuit 3.
In the drive circuit 2, when electric power from the commercial power supply 20 is input to the rectifier circuit 21, it is rectified by the diode bridge of the rectifier circuit 21 and smoothed by the aluminum electrolytic capacitor. The rectified and smoothed power is input to the inverter 22. When the power element of the inverter 22 is driven by the drive signal from the control circuit 3, the output from the rectifier circuit 21 is converted into a power signal having a predetermined frequency and output to the motor 11 a of the compressor 11. In this way, the compressor 11 is driven. Further, the rotation frequency of the compressor 11 is adjusted by adjusting the frequency of the drive signal from the control circuit 3 to adjust the cooling or heating capability.
[0017]
FIG. 4 shows the configuration of the control circuit 3. The control circuit 3 mainly includes a control unit 30, a memory 31, a sensor 32, an electric circuit board 33, an indoor unit microcomputer 51, an I / F 52, a receiving unit 53, and a sensor 54. The indoor unit microcomputer 51, the I / F 52, the receiving unit 53, and the sensor 54 are provided in the indoor unit 50. Moreover, the control part 30, the memory 31, the sensor 32, and the drive circuit 2 are mounted in the control board 45 of the outdoor unit 40 so that it may mention later.
[0018]
The control unit 30 is configured to control the refrigerant circuit 1 and the drive circuit 2. The control unit 30 includes a microprocessor that executes a program of a predetermined control procedure to control the refrigerant circuit 1 and the drive circuit 2, and a drive circuit that generates a drive signal to be output to the drive circuit 2. Yes. The memory 31 stores set room temperature, set humidity, operation mode, control procedure program, and the like. The memory 31 may be provided separately from the control unit 30 as shown in FIG. 4, or may be built in the microprocessor. The sensor 32 includes a temperature sensor that detects the outside air temperature and a temperature sensor that detects the refrigerant piping temperature. The electric circuit board 33 is connected to the drive circuit 2, the control unit 30, the commercial power supply 20, and the I / F 52. The circuit board 33 is a noise removal circuit that removes the electric signal from the I / F 52 and the noise included in the commercial power supply 20, or an interface circuit that converts the electric signal from the I / F 52 into an electric signal that can be received by the control unit 30. Is included. The indoor unit microcomputer 51 transmits electrical signals from the receiving unit 53 and the sensor 54 to the electrical circuit board 33 via the I / F 52. The I / F 52 converts the electrical signal from the indoor unit microcomputer 51 into an electrical signal of a predetermined level and outputs it to the electrical circuit board 33. The receiving unit 53 receives a signal from a remote controller or the like and outputs it to the indoor unit microcomputer 51. The sensor 54 includes a temperature sensor that detects room temperature and a humidity sensor that detects indoor humidity.
[0019]
[Air conditioning operation]
In such an air conditioner, when the receiving unit 53 receives the operation mode, the set room temperature, etc., a signal of this instruction is output from the microcomputer 51 to the I / F 52 and converted into an electric signal of a predetermined level and is supplied to the circuit board 33. Is output. This electrical signal (operation mode, set room temperature) is subjected to noise removal by the noise removal circuit of the circuit board 33 and converted to an electrical signal that can be received by the microcomputer by the interface circuit. These commands (operation mode, set room temperature) are stored in a predetermined area of the memory 31 by the control unit 30. The control unit 30 controls the refrigerant circuit 1 based on this command (operation mode, set room temperature) and a program stored in the memory 31, and outputs a drive signal to the drive circuit 2. Specifically, the control unit 30 switches the four-way switching valve 12 and adjusts the valve of the decompressor 14 to a predetermined opening degree. Further, the compressor 11 of the refrigerant circuit 1 is driven by converting the power input from the commercial power supply 20 to the drive circuit 2 via the electric circuit board 33 into a power signal having a predetermined frequency.
[0020]
Hereinafter, the flow of the refrigerant in the refrigerant circuit 2 during cooling and heating will be described with reference to FIG.
[0021]
During the cooling operation, the four-way switching valve 12 is set to a solid line position, the decompressor 14 is throttled to a predetermined opening degree, and the compressor 11 is started. The high-pressure refrigerant discharged from the compressor 11 is condensed by the outdoor heat exchanger 13 and then decompressed by the decompressor 14. The decompressed low-pressure refrigerant evaporates in the indoor heat exchanger 15 and then returns to the compressor 11 via the four-way switching valve 12 and the accumulator 16. When the refrigerant evaporates in the indoor heat exchanger 15, the indoor air is deprived of heat by the refrigerant, and the indoor air deprived of this heat acts as cold air.
[0022]
During the heating operation, the four-way switching valve 12 is set to the dotted line position, the decompressor 14 is throttled to a predetermined opening degree, and the compressor 11 is started. The high-pressure refrigerant discharged from the compressor 11 is condensed by the indoor heat exchanger 15 and then decompressed by the decompressor 14. The decompressed low-pressure refrigerant evaporates in the outdoor heat exchanger 13 and then returns to the discharge side of the compressor 11 via the four-way switching valve 12 and the accumulator 13. When the refrigerant condenses in the indoor heat exchanger 15, heat is released to the indoor air, so that the indoor air that has absorbed this heat acts as warm air.
[0023]
[Circuit board]
Hereinafter, specific configurations and arrangements of the outdoor unit 40 and the indoor unit 50 of the air conditioner according to the present embodiment will be described, and then the circuit board 33 will be described.
[0024]
FIG. 5 is a perspective view of the indoor unit 40 and the indoor unit 50 of the air conditioner according to the present embodiment. FIG. 6 is a perspective view of the inside of the outdoor unit 40. The outdoor unit 40 is installed outdoors with the rear surface facing the building, and the outside air sucked from the rear surface by a propeller fan (not shown) is brought into contact with the outdoor heat exchanger 13 and discharged from the front surface. The indoor unit 50 brings indoor air sucked from above into contact with the indoor heat exchanger 15 and supplies the indoor air from the outlet through a cross flow fan (not shown).
[0025]
In the indoor unit 50, the indoor heat exchanger 15, the indoor unit microcomputer 51, the I / F 52, the receiving unit 53, and the sensor 54 described above are provided inside the main body casing 55. As shown in FIG. 5, the outdoor unit 40 includes a main body casing 41 and a closing valve cover 42. Inside, as shown in FIG. 6, an outdoor heat exchanger 13, a machine room 43, and an electrical box 44 are provided.
[0026]
The machine room 43 is provided with a compressor 11, a four-way switching valve 12, a decompressor 14, and an accumulator 16. These compressor 11, four-way switching valve 12, decompressor 14, accumulator 16 and outdoor heat exchanger 13 are connected to each other by a refrigerant pipe as shown in FIG. 2, and the indoor heat exchanger 15 is further connected by pipes 46 and 47. It is connected to the.
[0027]
The electrical box 44 is provided with a control plate 45 and an electrical path plate 33. As described above, the control plate 45 includes the control unit 30, the memory 31, the sensor 32, and the drive circuit 2. The output of the drive circuit 2 is connected to the compressor 11, and the control unit 30 is connected to the four-way switching valve 12 and the pressure reducer 14. The control board 45 is a device in which electronic components such as a microcomputer, a memory, and a power element are mounted on a printed board on which a conductor pattern is drawn on an epoxy resin or a phenol resin.
[0028]
As shown in FIG. 6, the electric circuit board 33 is arranged side by side at one end of the control board 45, and is electrically connected to the control unit 30 on the control board 45 and the input side of the drive circuit 2. Further, the terminal unit 63 is connected to the commercial power supply 20 and the indoor unit 50 (I / F 52) via the electric cable 48. The electric circuit board 33 is a device in which a wiring pattern is formed with a conductive wiring made of a thin metal plate, and the conductive wiring is hardened with an insulating resin. As shown in FIG. 6, the electric circuit board 33 has a substantially rectangular parallelepiped shape.
[0029]
FIG. 7 shows an enlarged view of the surface of the circuit board 33 facing the control plate 45 (hereinafter referred to as the front surface), and FIG. 8 shows an enlarged view of the surface of the circuit board 33 not facing the control plate 45 (hereinafter referred to as the back surface). .
[0030]
As shown in FIG. 7, the surface of the electric circuit board 33 is a component mounting surface on which electronic components constituting the noise removal circuit and the interface circuit are mounted. On the mounting surface, a connection hole 61 electrically connected to the drive circuit 2 and a harness 62 electrically connected to the control unit 30 are provided. These connection holes 61 and harness 62 are respectively connected to the conductor pattern on the control board 45, and the connection holes 61 and the drive circuit 2, and the harness 62 and the control unit 30 are electrically connected to each other.
[0031]
As shown in FIG. 8, a plurality of grooves 34 are formed at the end portions of the back surface of the circuit board 33, and terminal portions 63 are disposed in these grooves 34. The terminal portion 63 is electrically connected to the internal conductor wiring, and has a terminal plate 63a having a screw hole, a washer 63b disposed opposite to the terminal plate 63a and formed with a through hole, and a through hole of the washer 63b. There is provided a screw 63c that is screwed into the screw hole of the terminal plate 63a through the hole and fastens the washer 63b to the terminal plate 63a. The groove 34 is formed on the surface of the end portion of the circuit board 33 in order to arrange the terminal portion 63. Further, the groove 34 includes grooves 34a and 34b that are continuously formed at both ends of the washer 63b inwardly of the washer 63b. The cable tip 48a can be stored in these grooves 34a and 34b. Further, a convex portion 64 is formed between the grooves 34a and 34b, and a connection hole 64a is formed in the convex portion 64. The connection hole 64a is connected to the terminal portion via an internal conductor wiring. 63 is electrically connected.
[0032]
The case where an electric cable is connected to this terminal part 63 is demonstrated with reference to FIG. The electric cable 48 is inserted between the washer 63b and the terminal plate 63a until the tip 48a reaches the groove 34a or 34b. After confirming that the distal end portion 48a has reached the groove 34a or 34b, the screw 63c is tightened with the cable distal end portion 48a interposed therebetween, and the cable distal end portion 48a is held between the washer 63b and the terminal plate 63a. At this time, the side surface of the washer 63b contacts the side surface of the convex portion 64, and the washer 63b and the screw 63c are supported by the convex portion 64. For this reason, the washer 63b can be easily fixed by the screw 63c.
[0033]
Thus, since it is visually recognized that the cable front end portion 48a has reached the groove 34a and the washer 63b is pressed against the terminal plate 63a, the cable front end portion 48a can be fixed in a state of being sufficiently inserted into the washer 63b. As a result, it is possible to prevent the insertion of the cable front end portion 48a and the screw 63c from being loosened, and the occurrence of electrical contact failure between the cable front end portion 48a and the terminal portion 63.
[0034]
Further, it is possible to check whether or not the terminal portion 63 and the electric cable are electrically connected by inserting a lead from the inspection jig into the connection hole 64a.
[0035]
【The invention's effect】
According to the electrical circuit board according to claim 1, it is confirmed that the end of the cable is inserted into the groove formed to extend inside the washer, and the cable is fixed in a state where the cable is sufficiently inserted under the washer. Can be. As a result, since the cable is not sufficiently inserted, it is possible to prevent the washer from loosening and poor contact.
[0036]
Further, no groove is formed in the central portion inside the washer, and the washer is supported by this portion, so that the washer can be easily screwed. In addition, it is possible to check whether the terminal plate is electrically connected to the electric cable by inserting a lead from the inspection jig into the connection hole.
[0037]
According to the air conditioner pertaining to the second aspect , it is possible to obtain the same effect as that of the electrical circuit board pertaining to the first aspect .
[Brief description of the drawings]
FIG. 1 is a schematic block diagram of an air conditioner according to an embodiment of the present invention.
FIG. 2 shows the refrigerant circuit.
FIG. 3 shows its driving circuit.
FIG. 4 shows its control circuit.
FIG. 5 is a perspective view of an air conditioner according to an embodiment of the present invention.
FIG. 6 shows the inside of the outdoor unit.
FIG. 7 shows a component mounting surface of the circuit board.
FIG. 8 is a terminal connection surface of the circuit board.
FIG. 9 is an enlarged view of a terminal portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigerant circuit 33 Electric circuit board 34 Groove 40 Outdoor unit 45 Control board 46, 47 Refrigerant piping 50 Indoor unit 63 Terminal part 63a Terminal board 63b Washer 63c Screw 64 Protrusion part 64a Connection hole

Claims (2)

An electric circuit board provided in an air conditioner, wherein an electric cable is attached to an end portion by a washer,
Conductor wiring of a thin metal plate,
A resin plate provided integrally with the conductor wiring, having a groove formed at the end, and a terminal plate to which an electric cable is attached by a washer;
The groove Ri retractable der the tip of the electric cable extends inward from a portion of the washer,
In the resin member, a groove formed to extend inward from the washer is formed only at both end portions of the washer, and a connection hole electrically connected to the conductor wiring is formed in the central portion.
Electric circuit board. An indoor unit that exchanges heat between the indoor air and the refrigerant and supplies cold air or warm air into the room;
One end is connected to the indoor unit, a refrigerant pipe capable of circulating the refrigerant,
An outdoor unit connected to the other end of the refrigerant pipe, constituting a refrigerant circuit together with the indoor unit and the refrigerant pipe, and supplying a compressed or decompressed refrigerant to the indoor unit via the refrigerant pipe;
A control plate for controlling the refrigerant circuit;
The control plate, the electrical path plate according to claim 1, in the indoor unit and the commercial power supply are electrically connected,
Air conditioner equipped with.

Images