JP2008006048A - Laundry machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laundry machine which uses a noise filter as a separated member from a control unit, carries out an electromagnetic wave reduction without the restriction of the control unit, and has reliable waterproof effect. <P>SOLUTION: This laundry machine includes a control unit 47 controlling the operation of a motor 46 and the like, a power source input part 67 for the control unit, a noise filter 53 attached to the power source input part 67, and a case 60 containing the control unit. The noise filer 53 is separated from the control unit 47 and contained integrally in the case 60. Therefore, the optimum electromagnetic wave shielding effect of the noise filter 53 can be pursued without the restriction of the control unit. In addition, the filter is waterproofed by the case 60 of the control unit, so that a safe laundry machine with an improved electromagnetic wave shielding effect can be provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a washing machine including a noise filter and a control unit in a power supply unit.

  In recent years, an inverter control circuit or the like is frequently used in a washing machine in order to control a drive unit such as a motor. Furthermore, in order to prevent electromagnetic noise generated from this control circuit from adversely affecting other devices through the power line, etc., or from noise generated from the motor circuit, this electromagnetic noise is reduced. It is common to provide a noise filter for blocking.

  As a first conventional configuration example of the noise filter, a noise filter circuit is connected to a control unit circuit on the input side of the power supply circuit while increasing the distance between the power cord and the motor cord to reduce the influence of noise. (For example, refer to Patent Document 1).

  Further, as a second conventional configuration example other than the first conventional configuration example, there are those described below, FIG. 8 is an external view of the washing machine, and FIG. 9 is a main part of the washing machine. It is a disassembled perspective view.

  In FIG. 8, the top cover 2 is mounted above the outer box 1, a rear panel 28 having a water supply inlet 32a is provided behind the top cover 2, a lid 37 is freely opened and closed near the center, and a front is provided. A front panel 38 having various operation keys and displays is attached.

  In FIG. 9, a control center 4a having a microcomputer, an inverter circuit, and the like, and an operation / display for operation and display connected to the control panel 4a by a lead sensor 4b are provided below the front panel 38 in FIG. The control device 4 configured with the unit 4c is arranged.

  In addition, a noise filter housing portion in which a filter case 16 incorporating a noise filter 12 for blocking noise emitted from the control device 4 is formed on the top cover 2 from above by a filter cover 21 inside the rear panel 28. 26 is engaged and mounted.

One end of the noise filter 12 is connected to a power cord 19 connected to a plug 29 inserted into a power outlet (not shown), and the other end is connected to a lead wire 30 connected to the control device 4. ing. In this configuration, the control device 4 and the noise filter 12 are arranged inside the top cover 2 to improve the workability of assembly and wiring (for example, see Patent Document 2).
JP 2001-46786 A JP-A-11-9889

  However, in the first conventional configuration example (Patent Document 1), since the noise filter is a part of the circuit of the control unit, depending on the geometric combination of the elements constituting the noise filter, the size, etc. There were cases where electromagnetic waves could not be reduced sufficiently due to restrictions.

  As a countermeasure, when a method of separating the noise filter from the control unit is employed as in the second conventional configuration example shown in FIGS. 8 and 9 (Patent Document 2), electrical connection to the noise filter is required. There is a problem that it is necessary to prevent incorrect wiring including a power supply polarity error, and a problem that the wiring from the noise filter to the control device (control unit) becomes long and the performance becomes unstable. In addition, the noise filter is installed in the rear panel where the water supply inlet is also installed, and the insulation deteriorates in the event of a malfunction such as water leakage near the water flow structure. There was also a problem in that respect.

  The present invention solves the above-described conventional problems, and enables electromagnetic wave reduction in a washing machine without restriction of the control unit, reliably prevents erroneous wiring to the noise filter, and enhances the waterproof effect of the noise filter. For the purpose.

  In order to solve the above-described conventional problems, the washing machine of the present invention is a separate member separated from the control unit and accommodates the noise filter in a case that accommodates the control unit, and is connected to the input / output terminals of the noise filter. In order to prevent incorrect wiring, the terminals on the input side and the control unit side of the power source are configured in different shapes that cannot be connected to each other.

  As a result, the noise filter is not limited by the control unit, and can obtain a single optimum electromagnetic wave shielding effect, and the noise filter can be waterproofed integrally with the storage case of the control unit, so that the compactness can be achieved. .

  The washing machine of the present invention can provide a washing machine having a configuration in which a noise filter can obtain an optimum electromagnetic wave shielding effect with a waterproof effect and can prevent erroneous wiring.

  The first invention includes a control unit that controls the operation of a load device such as a motor, a power input unit of the control unit, a noise filter added to the power input unit, and a case that houses the control unit. The noise filter is a separate member separated from the control unit, and is housed together with the control unit in the case, so that the optimum electromagnetic wave shielding effect of the noise filter can be pursued without restriction of the control unit, and the control unit It is possible to provide a washing machine that can be waterproofed in a safe case and has an enhanced electromagnetic shielding effect.

  In the second invention, in particular, the case housing the control unit of the first invention has a lid, and the noise filter is held by the rib formed on the case and the lid by closing the lid. By adopting the configuration, the noise filter can be held and fixed with a simple configuration, so that a highly productive washing machine can be provided.

  In the third invention, in particular, the case housing the control unit of any one of the first and second inventions has an insulation wall between the control unit and the noise filter, so that the insulation distance increases. Since both insulation properties are improved, a washing machine with improved safety can be provided.

  According to a fourth aspect of the invention, in particular, the insulating wall of the third aspect of the invention is a washing machine that eliminates the influence of electromagnetic waves from the control unit on the noise filter by arranging a metal plate inside the wall surface to form an electromagnetic wave shielding wall. Can provide.

  In the fifth invention, in particular, the noise filter according to any one of the first to fourth inventions has respective terminals on the input side and the control unit side of the power supply, and the terminal shapes on the respective sides are connected to each other. By adopting an impossible separate shape, it is possible to provide a washing machine capable of preventing erroneous insertion between the terminals.

  In the sixth invention, in particular, the noise filter of any one of the first to fifth inventions displays the polarity of the input power supply in the vicinity of the terminal on the input side of the power supply. A washing machine that can be prevented can be provided.

  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 a longitudinal sectional view of a washing machine according to a first embodiment of the present invention, FIG. 2 is a conceptual circuit diagram of the washing machine, and FIG. 3 is an external view of a noise filter of the washing machine. 4 is a sectional view of the control unit of the washing machine, FIG. 5 is an exploded view of the control unit of the washing machine, and FIG. 6 is an external view of the control unit of the washing machine. .

  In FIG. 1, a water tank 43 that rotatably supports a rotating drum 42 having a large number of small holes 41 around it is supported by a suspension 44 in a washing machine outer box 40 in a vibration-proof manner.

  The rotating drum 42 is fixed to the rotating shaft 45 at the outer bottom thereof, and is connected to a motor 46 fixed to the outer bottom of the water tank 43. Inverter operation control of the motor 46 is performed by a control unit 47 disposed at the bottom of the outer box 40, and a signal line is connected to the display input device 48 disposed above the outer box 40 for performing operations and displays related to the washing machine operation. 49.

  The control unit 47 is housed in the case 60 together with the noise filter 53 and is connected to a power cord 51 having a plug 50 at a tip portion by a connection line 52, and a load device such as a motor 46 is connected to a load cable 54. Connected.

  In the circuit conceptual diagram of FIG. 2, the input side of the noise filter 53 is connected to a terminal 56 a from a power source distributed at home such as 100 V or 200 V from connection lines 52 and 52 b connected to a plug 50 and a power cord 51. And 56b.

  The noise filter 53 is configured as a separate member independent of the control unit 47. On the output side from the noise filter 53, the output line 55 is wired to the power input unit 67 of the control unit 47 via the control side terminal 57. The power source side of the noise filter 53 is connected to the power source from the power cord 51 and the plug 50 via the connection line 52.

  In the circuit as described above, the electromagnetic noise emitted from the control unit 47 having the inverter control circuit or the like is blocked by the noise filter 53 and adversely affects other devices from the plug 50 or the like through an external power line or the like. Absent. In order to enhance the effect, it is required that the length of the output line 55 connecting the control unit 47 and the noise filter 53 is short. This is because if the output line is long, it may be transmitted in the air before being blocked by the noise filter 53 due to the antenna effect.

  In the external view of FIG. 3, the noise filter 53 has a configuration in which an electronic member and a circuit are accommodated in a cylindrical case.

  Among the terminals connected to the power supply side on the input side of the noise filter 53, the power supply polarity line side is designated as the power supply side terminal 56a, the neutral side is designated as the power supply side terminal 56b, and “L” means a power supply polarity line. A polarity display 56c of “N” and a polarity display 56d of “N” meaning neutral are displayed in the vicinity of each terminal on the noise filter.

  The terminals 56a and 56b are faston terminals with a resin housing and a one-pole type that can be inserted and removed in order to improve assembly work and service workability. On the other hand, the control-side terminal 57 on the output side is a faston terminal with a resin housing and is a two-pole type.

  The pitch between the terminals of the two poles is unique to this terminal and is set so that it cannot be inserted into the other terminal side. Therefore, it is impossible to connect the input side and the output side by mistake.

  A lead wire 58 extending from the noise filter 53 is a ground wire, and prevents noise from entering from the ground wire via a ground inductor (not shown) inside the noise filter 53.

  In the cross-sectional view of the control unit portion of FIG. 4, the housed state of the noise filter 53 and the control unit 47 in the case 60 and the lid 61 will be described.

  The noise filter 53 is a separate member separated from the substrate 47a of the control unit 47, and is housed in the case 60 as a single member. Below the noise filter 53, the support rib 62 is provided on the case 60 and placed. The lid 61 formed on the upper side is provided with a pressing rib 63 and is held from above.

  The case 60 and the lid 61 are made of an insulating plastic material or the like, and the lid 61 forms a window 64 that dissipates heat generated from the electrical member placed on the internal control unit 47 and has a small screw 65. And fastened to the boss 66 formed on the case 60, and fixed to the case 60.

  In the exploded view of the control unit portion of FIG. 5, the noise filter 53 is disposed adjacent to the board 47 a of the control unit 47, and the output line 55 is a power input unit near the noise filter 53 at a short distance. Connected to the control unit 47 at 67.

  The connection line 52 of the noise filter 53 is pulled out from the opening 68 formed in the case 60 and connected to the power cord 51 and the plug 50 described in FIG. Further, the load cable 54 from the control unit 47 to the load device such as the motor 46 is drawn from a guide groove 69 formed in the case 60. An attachment hinge 70 formed integrally with the case 60 is for attaching to the bottom of the outer box 40 of the washing machine.

  In the external view of the control unit in FIG. 6, the noise filter 53 is housed in a box-shaped case composed of an insulating material case 60 and a lid 61 together with the control unit 47, and needs to be connected to the outside. The connection line 52 and the load cable 54 are pulled out.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  The power supplied from the power cord 51 is connected to the noise filter 53 from the line-side power-side terminal 56a on the input side and from the power-side terminal 56b on the neutral side, and to the output line 55 through the connection of the control-side terminal 57 on the output side. The control unit 47 is connected and energized to drive the load device of the motor 46 in accordance with a signal from the display input device 48.

  The noise filter 53 is housed in the case 60 and the lid 61 together with the control unit 47, but is separated from the control unit 47, and thus does not need to be arranged on the substrate of the control unit 47. The shape, specification and arrangement of noise prevention parts specialized for the prevention function are possible.

  Furthermore, since it is insulated and waterproofed by the case 60 and the lid 61 and is installed adjacent to the control unit 47 in the same case, it has a stable performance from the short length of the output line 55 and is connected to both. It is safe because the connecting portion is covered with the lid 61, and it is possible to make it compact.

  Further, since the noise filter 53 is fixed by the support rib 62 from the case 60 and the pressing rib 63 from the lid 61, the assembly is also simplified.

  The noise filter 53 has an input side and an output side terminal, and an error-free connection is required. The noise filter 53 has a one-pole terminal on the input side and a two-pole terminal on the output side. Since it is used, there is no miswiring between the connection input side and the output side. In addition, polarity indications “L” 56c and “N” 56d are provided on the power supply side terminals of the power supply side terminals on the input side for easy visual recognition, and errors during reassembly after disassembly during service or service. The wiring is prevented.

  As described above, in the present embodiment, the noise filter is separated from the control unit and integrated into the case that houses the control unit. Noise prevention performance can be improved compared with the prevention function, and the waterproofness required for the washing machine can be satisfied, the size can be reduced, and incorrect wiring connection can be prevented.

(Embodiment 2)
FIG. 7 shows a sectional view of the control unit portion of the washing machine in the second embodiment of the present invention.

  Between the noise filter 53 and the control unit 47, an insulating wall 72 is formed from the case 71 so that the tip 72a is positioned above the position of the center line height H of the cylindrical noise filter 53. Yes.

  Further, a metal plate 73 is disposed inside the wall surface of the insulating wall 72 from the case 71. The metal plate 73 is configured by, for example, insert molding into a case 71 made of a resin molding member, or by forming a groove in the case 71 in advance and inserting the metal plate 73 into the groove. is doing.

  About the washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  A sufficient creepage distance is secured between the noise filter 53 and the control unit 47 by the insulating wall 72, so that the insulation performance between the noise filter 53 and the control unit 47 should be ensured even if moisture or the like enters the case and the inside of the lid. Can be secured.

  Further, the influence of the electromagnetic wave generated from the control unit 47 on the noise filter 53 is shielded and reduced by the metal plate 73. Since the metal part is not exposed to the outside with respect to the noise filter 53 and the control unit 47, the electromagnetic wave can be reduced with a configuration that does not impair the insulation performance, which contributes to the overall compactness.

  As described above, the utilization according to the present invention is useful for devices that need to suppress the generation of electromagnetic waves and have water resistance, other than the washing machine.

1 is a longitudinal sectional view of a washing machine according to Embodiment 1 of the present invention. Circuit conceptual diagram of the washing machine External view of the noise filter of the washing machine Sectional view of the control unit of the washing machine Exploded view of the control unit of the washing machine External view of the control unit of the washing machine Sectional drawing of the control unit part of the washing machine in Embodiment 2 of this invention External view of conventional washing machine The exploded perspective view of the main part of the conventional example

Explanation of symbols

46 Motor 47 Control unit 53 Noise filter 56b Power supply side terminal 56c Polarity display 57 Control side terminal 60 Case 61 Lid 62 Support rib 63 Holding rib 67 Power input part 72 Insulating wall 73 Metal plate

Claims (6)

A control unit that controls the operation of a load device such as a motor; a power input unit of the control unit; a noise filter that is added to the power input unit; and a case that houses the control unit. A washing machine as a separate member separated from the unit and housed together with the control unit in the case. The washing machine according to claim 1, wherein a case for housing the control unit has a lid, and the noise filter is held by the rib formed on the case and the lid by closing the lid. The washing machine according to any one of claims 1 to 2, wherein the case storing the control unit has an insulating wall between the control unit and the noise filter. The washing machine according to claim 3, wherein the insulating wall has a configuration in which a metal plate is disposed inside the wall surface to form an electromagnetic wave shielding wall. The washing machine according to any one of claims 1 to 4, wherein the noise filter has respective terminals on the input side and the control unit side of the power source, and each of the terminals has a different shape that cannot be connected to each other. . The washing machine according to any one of claims 1 to 5, wherein the noise filter displays a polarity display of the input power supply in the vicinity of a terminal on the input side of the power supply.

Images