WO2021008370A1 - 洗衣机 - Google Patents

洗衣机 Download PDF

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Publication number
WO2021008370A1
WO2021008370A1 PCT/CN2020/099745 CN2020099745W WO2021008370A1 WO 2021008370 A1 WO2021008370 A1 WO 2021008370A1 CN 2020099745 W CN2020099745 W CN 2020099745W WO 2021008370 A1 WO2021008370 A1 WO 2021008370A1
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WO
WIPO (PCT)
Prior art keywords
rotation speed
safety
washing machine
control unit
circuit
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PCT/CN2020/099745
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English (en)
French (fr)
Inventor
川边庆久
Original Assignee
青岛海尔洗衣机有限公司
Aqua株式会社
海尔智家股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 青岛海尔洗衣机有限公司, Aqua株式会社, 海尔智家股份有限公司 filed Critical 青岛海尔洗衣机有限公司
Priority to CN202080051280.2A priority Critical patent/CN114127355B/zh
Publication of WO2021008370A1 publication Critical patent/WO2021008370A1/zh

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/42—Safety arrangements, e.g. for stopping rotation of the receptacle upon opening of the casing door

Definitions

  • the present invention relates to a washing machine provided with a door locking device for preventing opening of the door, for example.
  • washing machines have a door locking device for preventing the door from opening.
  • the door lock device locks and unlocks the door according to the control signal from the control unit.
  • the control unit stores a program for controlling the operation of the washing machine, and controls the door locking device according to the program.
  • the door lock device 106A has a drive circuit 131 including a solenoid 118a as a drive device so as to switch the position of the locking portion 118 that locks the door to either a locked position or a released position.
  • the driving circuit 131 is connected to an operation receiving unit 151 that receives an operation signal from the control unit 120.
  • the control section 120 provides the operation receiving section 151 with solenoid power for driving the solenoid 118a, and provides the operation receiving section 151 with a door lock signal or an unlock signal.
  • the drive circuit 131 when the rotation speed of the drum exceeds a predetermined rotation speed, when the solenoid power supply and the door lock signal are supplied from the control unit 120 to the operation receiving unit 151, the drive circuit 131 operates based on the operation signal , Switch to locked state. Then, when the rotation speed of the drum is below the predetermined rotation speed, the solenoid power supply and the unlock signal are supplied from the control unit 120 to the operation receiving unit 151, and the drive circuit 131 operates based on the operation signal to switch to the unlock state.
  • control unit 120 provides solenoid power and an unlock signal to the operation receiving unit 151 due to a malfunction caused by a program failure, electrical interference, etc. in the locked state, regardless of the drum If the speed exceeds the specified speed, the door lock state will be cancelled by mistake.
  • Patent Document 1 Japanese Patent Application Publication No. 2018-33512
  • the object of the present invention is to provide a washing machine that can prevent the door lock state from being erroneously released due to malfunction caused by program failure, electrical interference, etc.
  • the washing machine of the present invention is characterized by comprising: a drum arranged in a cabinet; a door locking device that switches a door opened and closable in the cabinet to a locked state or an unlocked state; and a control unit that provides output An operation signal to a drive circuit that controls the door lock device; and a safety circuit that allows the drive based on the operation signal from the control unit when the rotation speed of the drum is less than a predetermined rotation speed determined in advance The operation of the electric circuit is prohibited, and the operation of the drive circuit based on the operation signal from the control unit is prohibited when the rotation speed of the drum exceeds the predetermined rotation speed.
  • the washing machine of the present invention it is preferable that a plurality of the safety circuits are provided, and when all of the plurality of safety circuits are permitted, the operation of the drive circuit based on the operation signal from the control unit is permitted.
  • a safety board having a plurality of the safety circuits and an operation receiving unit that receives an operation signal from the control unit and supplies the operation signal to the drive circuit
  • Each of the plurality of safety circuits has: a threshold value setting unit that sets a threshold value corresponding to the predetermined rotation speed, and the threshold value is used to determine whether to allow the operation of the drive circuit based on the operation signal from the control unit; And a driving power cut-off unit that switches the on-off state of the power supply line and the driving circuit, a plurality of the safety circuits are arranged in series, and when all of the plurality of safety circuits are allowed, the operation receives The operation signal received by the unit supplies power to the drive circuit to operate the drive circuit.
  • the plurality of the safety circuits further each have a rotation speed detection unit that detects the rotation speed of the drum, and a part of the rotation speed detection units of the plurality of rotation speed detection units is configured to detect the drop of the rotation pulse
  • the safety circuit is constituted by hardware.
  • the safety circuit is composed of a circuit board different from the control unit.
  • the washing machine of the present invention is equipped with a safety circuit that allows the operation of the drive circuit based on the operation signal from the control unit when the rotation speed of the drum is below a predetermined predetermined rotation speed, and when the rotation speed of the drum exceeds the predetermined rotation speed The operation of the drive circuit based on the operation signal from the control unit is prohibited.
  • the safety circuit prohibits the operation of the drive circuit based on the operation signal from the control unit. Therefore, it is possible to prevent the control unit from malfunctioning due to program failure, electrical interference, etc.
  • the operation signal is provided to the driving circuit, and the door locked state is released due to the operation signal.
  • the operation of the drive circuit based on the operation signal from the control unit is allowed only when all of the multiple safety circuits are allowed, so even if one of the multiple safety circuits malfunctions , It can also reliably prevent the locked door from being released.
  • a plurality of safety circuits are arranged in series, and when all the plurality of safety circuits are allowed, the driving circuit is powered to operate. Therefore, it is possible to reliably prevent the door locked state from being released by stopping the power supply.
  • the multiple safety circuits are provided with rotation speed detection units, and the active L-shaped rotation speed detection unit and the active H-shaped rotation speed detection unit are used together, so that the pulse edge can be reliably detected.
  • the door lock state can be prevented from being released due to program failure.
  • the safety circuit is composed of a circuit board different from the control unit. Therefore, by using a physically different board, the convenience of circuit design and identification of safety is improved.
  • Fig. 1 is a schematic cross-sectional view of a washing machine 100 according to an embodiment of the present invention.
  • Fig. 2 is a control block diagram of the washing machine 100 of Fig. 1.
  • FIG. 3 is a circuit diagram of the washing machine 100 of FIG. 1.
  • Fig. 4 is a diagram illustrating a door locking operation of the washing machine 100 of Fig. 1.
  • Fig. 5 is a circuit diagram of a conventional washing machine.
  • FIG. 1 is a schematic cross-sectional view of a washing machine 100 according to an embodiment of the present invention.
  • a substantially cylindrical outer tube 2 is arranged inside a box-shaped box 1. Inside the outer tube 2, a main shaft 5 extending in the front-rear direction is pivotally supported for housing A substantially cylindrical drum 4 for laundry.
  • the laundry inlet 2a formed on the front surface of the outer tub 2 is opened and closed by the door 6, and the laundry can be injected into the drum 4 with the door 6 open.
  • the drum 4 can rotate around a rotation axis in the horizontal direction.
  • Many liquid holes 4a are perforated on the peripheral surface of the drum 4, and the solvent supplied into the outer cylinder 2 during washing and rinsing passes through the liquid holes 4a and flows into the drum 4.
  • the solvent discharged from it passes through the liquid through hole 4a and scatters to the outer cylinder 2 side.
  • the main shaft 5 is rotatably supported by a bearing 5a attached to the back wall of the outer cylinder 2, and further, a main pulley 8 is mounted on the top end of the main shaft 5 protruding rearward.
  • a motor 9 is provided at the bottom of the box 1, and a motor pulley 10 is mounted on the rotating shaft of the motor 9. The rotational power of the motor pulley 10 is transmitted to the main pulley 8 via the timing belt 11. As a result, when the motor 9 is driven, the drum 4 rotates at the rotation speed of the motor 9 decelerated by a predetermined reduction ratio, and rotates around the main shaft 5.
  • the upper part of the back wall of the outer cylinder 2 is connected to a liquid supply pipe 12 provided with a liquid supply valve 12 a.
  • a liquid supply valve 12 a When the liquid supply valve 12 a is opened, the solvent is supplied to the outer cylinder 2 through the liquid supply pipe 12.
  • the discharge port provided at the bottom of the outer cylinder 2 is connected to a discharge pipe 16 provided with a discharge valve 16a.
  • the discharge valve 16a When the discharge valve 16a is opened, the solvent in the outer cylinder 2 is discharged through the discharge pipe 16 to the outside of the machine.
  • a door lock device 6A for preventing the door 6 from opening is provided on the front surface of the box body 1.
  • the door lock device 6A is controlled to an unlocked state where the door 6 can be opened when the rotation speed of the drum 4 is less than or equal to the predetermined rotation speed, and is controlled so that the door 6 cannot be opened when the rotation speed of the drum 4 exceeds the predetermined rotation speed.
  • the locked state of the door is controlled to an unlocked state where the door 6 can be opened when the rotation speed of the drum 4 is less than or equal to the predetermined rotation speed, and is controlled so that the door 6 cannot be opened when the rotation speed of the drum 4 exceeds the predetermined rotation speed.
  • FIG. 2 is a control block diagram of the washing machine 100 of this embodiment.
  • the control unit 20 of the washing machine 100 is composed of, for example, a microcomputer, and includes a CPU, a ROM storing a program that controls the operation of the washing machine 100, and a RAM that temporarily stores data and the like used when the program is executed. The operation of the washing machine 100 is controlled by the control unit 20.
  • the door locking device 6A has a locking portion 18 that is arranged at a locking position for locking the door 6 in a locked state so as to prevent the door 6 from opening, and is arranged at a release position where the door 6 is not locked in an unlocked state So that the door can be opened6.
  • the door lock device 6A includes a solenoid 18a as a driving device to switch the position of the locking portion 18 to one of the locking position and the releasing position.
  • the door lock device 6A is controlled by an operation signal (solenoid power supply and door lock signal or unlock signal) provided by the control section 20 of the washing machine 100.
  • the door lock device 6A moves the locking unit 18 to the locking position through the solenoid 18a to switch to the door locking state.
  • the solenoid power supply and the unlock signal are supplied from the control unit 20, the door lock device 6A moves the locking portion 18 to the release position through the solenoid 18a to switch to the unlock state.
  • the washing machine 100 has a safety board 30 and a drive circuit 33 that controls the door lock device 6A.
  • the driving circuit 31 is a circuit for driving the solenoid 18 a, and operates based on an operation signal from the control unit 20.
  • the safety board 30 has two safety circuits 50 and 50 a and an operation receiving unit 51 that receives operation signals from the control unit 20.
  • the safety substrate 30 is connected to the washing machine power supply and the solenoid power supply.
  • the two safety circuits 50 and 50a are circuits for preventing the lock of the door from being released by the door lock device 6A in a state where the lock of the door should not be released.
  • the two safety circuits 50 and 50a allow the operation of the drive circuit 31 based on the operation signal from the control unit 20 when the rotation speed of the drum 4 is below a predetermined predetermined rotation speed, and the rotation speed of the drum 4 exceeds the predetermined rotation speed. In the case of the rotation speed, the operation of the drive circuit 31 based on the operation signal from the control unit 20 is prohibited.
  • two safety circuits 50, 50a are arranged in series between the solenoid power supply and the operation receiving unit 51, and the operation receiving unit 51 is connected to the screw via the two safety circuits 50, 50a.
  • Line pipe power connection When the control unit 20 controls the solenoid 18a, the solenoid power supply as an operation signal is supplied to the operation receiving unit 51, but only when both safety circuits 50 and 50a allow the operation signal based on the operation signal from the control unit 20 When the driving circuit 31 is operating, solenoid power is supplied to the driving circuit 31.
  • the safety circuit 50 has a rotation speed detecting unit 53, a threshold value setting unit 54, and a driving power cutoff unit 55.
  • a photocoupler 58 is arranged between the rotation speed detection unit 53 and the drive power cut-off unit 55.
  • the rotation speed detection unit 53 outputs a pulse signal corresponding to the rotation speed of the drum 4 based on the detection signal from the rotation sensor 56.
  • the interval of the pulse signal output from the rotation speed detection unit 53 becomes shorter when the rotation speed of the drum 4 becomes higher, and becomes longer when the rotation speed of the drum 4 becomes lower. Therefore, the change in the rotation speed of the drum 4 can be detected based on the change in the interval of the pulse signal output from the rotation speed detection unit 53.
  • the door lock device 6A switches to the unlocked state when the rotation speed of the drum 4 is equal to or lower than the predetermined rotation speed, and switches to the door locked state when the rotation speed of the drum 4 exceeds the predetermined rotation speed.
  • the unlock state is switched when the interval between the pulse signals is greater than or equal to the threshold value t, and the interval between the pulse signals is shorter than the threshold value t. In this case, switch to the locked state.
  • the threshold value setting unit 54 sets a threshold value for determining whether to allow the operation of the drive circuit 31 based on the operation signal from the control unit 20. Specifically, the threshold value setting unit 54 sets a threshold value t indicating the interval of pulse signals when the rotation speed of the drum 4 is a predetermined rotation speed.
  • the drive power cut-off unit 55 switches the on-off state of the power supply line from the solenoid power source to the drive circuit 31. Specifically, the drive power cut-off unit 55 does not cut off the power to supply solenoid power to the drive circuit 31 when the rotation speed of the drum 4 is below the predetermined rotation speed, and cuts off the power when the rotation speed of the drum 4 exceeds the predetermined rotation speed. So that the solenoid power is not supplied to the drive circuit 31.
  • the safety circuit 50 has a D flip-flop 60 and transistors 61, 62, and 63.
  • the D flip-flop 60 is triggered by the rising (rising edge) of the rotation pulse signal.
  • the D flip-flop 60 has a D terminal, a CK terminal, a Q terminal, a Q'terminal, a CLR terminal, and a PR terminal.
  • the D terminal and PR terminal are connected to a voltage source 64 of rated voltage Vcc.
  • the CK terminal is connected to the rotation speed detection unit 53 via the photocoupler 58.
  • One end of the resistor 65 is connected to the Q terminal, and the other end of the resistor 65 is connected to one end of the capacitor 66. The other end of the capacitor 66 is grounded.
  • the Q'terminal is connected to the base of the transistor 61.
  • the collector of the transistor 62 is connected to the voltage source 68 of the rated voltage Vcc, and is connected to the CLR terminal of the D flip-flop 60.
  • the emitter of the transistor 62 is grounded.
  • the base of the transistor 62 is connected to the connection point P between the resistor 65 and the capacitor 66.
  • the collector of the transistor 63 is connected to the base of the transistor 62, and the emitter of the transistor 63 is grounded.
  • the base of the transistor 63 is connected to the CK terminal.
  • the threshold setting unit 54 includes a transistor 63, a resistor 65, and a capacitor 66. Therefore, the threshold value setting unit 54 sets the RC time constant determined by the resistance value of the resistor 65 and the capacitance value of the capacitor 66 as the threshold value t.
  • the transistor 63 is used to discharge the capacitor 66 of the threshold value setting unit 54 and reset the threshold value setting unit 54.
  • the drive power cut-off unit 55 includes a threshold value setting unit 54, a D flip-flop 60, and transistors 61 and 62.
  • the safety circuit 50a includes a rotation speed detecting unit 53a, a threshold value setting unit 54 and a driving power cutoff unit 55.
  • the rotation speed detector 53a of the safety circuit 50a outputs a pulse signal corresponding to the rotation speed of the drum 4 based on the detection signal from the rotation sensor 56a.
  • the safety circuit 50a has a D flip-flop 60 and transistors 61a, 62, and 63.
  • the connection method of the D flip-flop 60 and the transistors 61a, 62, and 63 in the safety circuit 50a is the same as that of the safety circuit 50, and detailed descriptions of the same parts are omitted.
  • the collector of the transistor 61 of the safety circuit 50 is connected to the solenoid power supply, and the emitter of the transistor 61 is connected to the collector of the transistor 61a of the safety circuit 50a.
  • the emitter of the transistor 61a of the safety circuit 50a is connected to the operation receiver 51.
  • the CK terminal of the D flip-flop 60 is connected to the rotation speed detector 53a via the photocoupler 58.
  • the CK terminal of the D flip-flop 60 is connected to the rotation speed detector 53a without passing through the photocoupler 58.
  • the rotation speed detector 53a is connected.
  • the rotation speed detection unit 53 of the safety circuit 50 and the rotation speed detection unit 53a of the safety circuit 50a respectively detect the rotation speed of the drum 4 and output a rotation pulse signal corresponding to the detected rotation speed.
  • the rotation pulse signal detected by the rotation speed detector 53 is input to the CK terminal as the clock input of the D flip-flop 60 in a state where Hi and Lo are reversed by the photocoupler 58 .
  • the state of the D terminal is output to the Q terminal and the Q'terminal as its inverted output in synchronization with the rise of the rotation pulse signal.
  • the D flip-flop 60 in the initial state, is the Lo of the rotation pulse signal, and stores the signal state of the D terminal.
  • the Q terminal becomes Lo and the Q'terminal becomes It is the opposite value Hi.
  • the transistor 61 is turned on by the Hi output from the Q'terminal of the flip-flop 60. Therefore, the solenoid power supply is connected to the drive circuit 31.
  • the D flip-flop 60 uses the rising (rising edge) of the rotation pulse signal as a trigger, and stores the signal state of the D terminal, the Q terminal becomes Hi, the Q'terminal becomes the opposite value Lo, and the transistor 63 is turned on instantaneously, restarting ⁇ Threshold setting unit 54.
  • the transistor 61 is turned on by the Lo output from the Q'terminal of the flip-flop 60. Therefore, the power supply line from the solenoid power supply to the drive circuit 31 is cut off.
  • the transistor 62 is turned on to be input to The states of CLR terminal, Q terminal and Q'terminal are reset, Q terminal becomes Lo, and Q'terminal becomes Hi. Therefore, the transistor 61 is turned on, and the current from the solenoid power supply flows from the collector of the transistor 61 to the emitter.
  • the transistor 62 does not change to ON, so The Q'terminal remains at Lo.
  • the transistor 61 maintains the off state by the Lo output from the Q'terminal of the D flip-flop 60. Therefore, the current from the solenoid power supply does not flow from the collector to the emitter of the transistor 61.
  • the rotation pulse signal detected by the rotation speed detecting unit 53a is input to the CK terminal as the clock input of the D flip-flop 60 in a state where Hi and Lo are not inverted. In this way, the state of the D terminal is output to the Q terminal and the Q'terminal as its inverted output in synchronization with the rise of the rotation pulse signal.
  • the operation after the rotation pulse signal is input to the CK terminal of the D flip-flop 60 is the same as that of the safety circuit 50, and detailed description thereof is omitted.
  • the rising edge of the pulse signal is used as a trigger to turn off the transistors 61 and 61a, and the solenoid power supply is cut off for a predetermined time. Then, when the rising edge of the next pulse signal does not occur until the predetermined time has elapsed, the solenoid is restored to the state where the solenoid power supply is not cut off when the predetermined time has elapsed. Therefore, since it is switched to the state where the solenoid power is supplied to the drive circuit 31, when the unlock signal is supplied from the control unit 50 in this state, the drive circuit 31 switches to the unlock state.
  • the rising edge of the pulse signal is used as a trigger to turn off the transistors 61 and 61a, and the solenoid power supply is cut off for a predetermined time. Then, until a predetermined time elapses, the next rising edge of the pulse signal is a trigger, the transistors 61 and 61a are turned off, and the solenoid power supply is cut off for a predetermined time. Therefore, since the state of shutting off the solenoid power supply continues, in this state, even if an unlock signal is provided from the control unit 50, the drive circuit 31 will not switch to the unlock state.
  • the washing machine 100 of this embodiment includes: the drum 4, which is arranged in the cabinet 1, the door locking device 6A, which switches the door 6 opened and closably provided in the cabinet 1 to the locked state or the unlocked state; and the control unit 20 outputs The operation signal provided to the drive circuit 31 that controls the door lock device 6A; and the safety circuits 50, 50a that allow driving based on the operation signal from the control unit 20 when the rotation speed of the drum 4 is below a predetermined rotation speed
  • the operation of the circuit 31, and the operation of the drive circuit 31 based on the operation signal from the control unit 20 is prohibited when the rotation speed of the drum 4 exceeds a predetermined rotation speed.
  • the washing machine 100 of the present embodiment includes safety circuits 50, 50a that allow the operation of the drive circuit 31 based on the operation signal from the control unit 20 when the rotation speed of the drum 4 is below a predetermined rotation speed. And when the rotation speed of the drum 4 exceeds a predetermined rotation speed, the operation of the drive circuit 31 based on the operation signal from the control unit 20 is prohibited. As a result, when the rotation speed of the drum 4 exceeds the predetermined rotation speed, the safety circuits 50, 50a prohibit the operation of the drive circuit 31 based on the operation signal from the control unit 20, thereby preventing program failure, electrical interference, etc.
  • the operation signal is supplied from the control unit 20 to the drive circuit 31 due to the malfunction, and the door lock state is released due to the operation signal.
  • the washing machine 100 of the present embodiment includes a plurality of safety circuits 50 and 50a, and when all the plurality of safety circuits 50 and 50a are permitted, the operation of the drive circuit 31 based on the operation signal from the control unit 20 is permitted.
  • the operation of the drive circuit 31 based on the operation signal from the control unit 20 is permitted only when all of the plurality of safety circuits 50 and 50a are permitted.
  • the malfunction of one of the safety circuits 50 and 50a can also reliably prevent the door lock state from being released.
  • the washing machine 100 of this embodiment includes a safety board 30 having a plurality of safety circuits 50, 50a and an operation receiving unit 51 that receives an operation signal from the control unit 20 and supplies the operation signal to the drive circuit 31.
  • Each of the safety circuits 50 and 50a has: a threshold value setting unit 54 that sets a threshold value t corresponding to a predetermined rotation speed, and the threshold value t is used to determine whether to allow the operation of the drive circuit 31 based on the operation signal from the control unit 20; and drive The power cut-off unit 55 switches the on and off states of the power supply line and the drive circuit 31, and the multiple safety circuits 50, 50a are arranged in series. When all the multiple safety circuits 50, 50a are allowed, the operation receiving unit 51 The received operation signal supplies power to the drive circuit 31 to operate the drive circuit 31.
  • the plurality of safety circuits 50 and 50a are arranged in series, and when all of the plurality of safety circuits 50 and 50a are permitted, the drive circuit 31 is powered to operate. Therefore, it is possible to reliably prevent the door locked state from being released by stopping the power supply.
  • the plurality of safety circuits 50 and 50a further respectively have rotation speed detection units 53 and 53a that detect the rotation speed of the drum 4, and the rotation speed detection unit 53 is an active L-shaped rotation speed detection unit that detects the drop of the rotation pulse.
  • the rotation speed detection part 53a is an active H-type rotation speed detection part which detects the rise of a rotation pulse.
  • the washing machine 100 of the present embodiment by providing the rotation speed detecting parts 53, 53a to the plurality of safety circuits 50, 50a, and using the active L-shaped rotation speed detecting part and the active H-shaped rotation speed detecting part together, it is possible to reliably perform Detection of pulse edges.
  • the safety circuits 50 and 50a are comprised by hardware.
  • the safety circuits 50 and 50a are configured by hardware, it is possible to prevent the door lock state from being released due to a program failure.
  • the safety circuits 50 and 50a are constituted by a circuit board different from the control unit 20.
  • the safety circuits 50 and 50a are composed of a circuit board different from the control unit 20, by using a physically different board, the convenience of determining whether the circuit design and safety are appropriate or not is improved.
  • the washing machine 100 having the drum 4 that can rotate about a rotation axis in the horizontal direction has been described, but the present invention can also be applied to the washing machine 100 having the drum 4 that can rotate about a rotation axis that is inclined relative to the horizontal direction. Washing machine.
  • the present invention can also be applied to a vertical washing machine having a washing tub (drum) rotatable about a rotation axis in a vertical direction.
  • the washing machine of the present invention may also have one or more than three safety circuits.
  • safety circuits 50 and 50a examples of the safety circuits 50 and 50a have been described, but the specific configuration of the safety circuits 50 and 50a is arbitrary. Therefore, as long as the safety circuits 50, 50a allow the operation of the drive circuit 31 based on the operation signal from the control unit 20 when the rotation speed of the drum 4 is below the predetermined rotation speed, and prohibit the operation based on the operation signal when the rotation speed of the drum 4 exceeds the predetermined rotation speed What is necessary is a circuit that drives the operation of the electric circuit 31 of the operation signal from the control unit 20.
  • the door lock device 6A has the solenoid 18a as the driving device for driving the locking portion 18, but the driving device is not limited to this.
  • the locking portion 18 may be driven by, for example, a motor as a driving device.
  • the rotation speed detection unit 53 is an active L-type rotation speed detection unit
  • the rotation speed detection unit 53a is an active H-type rotation speed detection unit.
  • the rotation detected by the rotation speed detection unit 53 The pulse signal passes through the photocoupler 58 to reverse Hi and Lo. Therefore, the same type of D flip-flop 60 triggered by the rising (rising edge) of the rotation pulse signal is used.
  • the rotation speed detection unit 53 is an active L-type rotation speed detection unit, and for the rotation pulse signal detected by the rotation speed detection unit 53, a D flip-flop 60 triggered by the falling (falling edge) of the rotation pulse signal is used.

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  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Abstract

一种洗衣机（100），具备：滚筒（4），配置于箱体（1）内；锁门装置（6A），将可开闭地设置于箱体（1）的门（6）切换为锁门状态或解锁状态；以及安全电路（50、50a），在滚筒（4）的转速为预先确定的规定转速以下的情况下允许控制锁门装置（6A）的驱动电路（31）工作，并且在滚筒（4）的转速超过规定转速的情况下禁止基于来自控制部（20）的操作信号的驱动电路（31）工作。

Description

洗衣机 技术领域
本发明涉及一种具备用于例如阻止门敞开的锁门装置的洗衣机。
背景技术
以往，一般而言，洗衣机具有用于阻止门敞开的锁门装置。锁门装置根据来自控制部的控制信号进行门的锁门和解锁。控制部存储有用于控制洗衣机的工作的程序，并根据该程序来控制锁门装置。
基于图5对现有的锁门装置的控制进行说明。锁门装置106A具有包括作为驱动装置的螺线管118a的驱动电路131，以便将对门进行卡定的卡定部118的位置切换为卡定位置和解除位置中的某一方。驱动电路131与接收来自控制部120的操作信号的操作接收部151连接。控制部120为操作接收部151提供用于驱动螺线管118a的螺线管电源，并且为操作接收部151提供锁门信号或解锁信号。
因此，现有的洗衣机中，在滚筒的转速超过规定转速的情况下，当从控制部120向操作接收部151提供了螺线管电源和锁门信号时，驱动电路131基于该操作信号进行工作，切换为锁门状态。然后，当滚筒的转速为规定转速以下时，从控制部120向操作接收部151提供螺线管电源和解锁信号，驱动电路131基于该操作信号进行工作，切换为解锁状态。
在现有的洗衣机中，假设在锁门状态下由于程序故障、电干扰等所引发的误工作而使得控制部120向操作接收部151提供了螺线管电源和解锁信号的情况下，无论滚筒的转速是否超过规定转速，锁门状态都会被误解除。
现有技术文献
专利文献
专利文献1：日本特开2018－33512号公报
发明内容
发明所要解决的问题
因此，本发明的目的在于提供一种能防止由于程序故障、电干扰等所引发的误工作而使得锁门状态被误解除的洗衣机。
用于解决问题的方案
即，本发明的洗衣机的特征在于，具备：滚筒，配置于箱体内；锁门装置，将可开闭地设置于所述箱体的门切换为锁门状态或解锁状态；控制部，输出提供给对所述锁门装置进行控制的驱动电路的操作信号；以及安全电路，在所述滚筒的转速为预先确定的规定转速以下的情况下允许基于来自所述控制部的操作信号的所述驱动电路的工作，并且在所述滚筒的转速超过所述规定转速的情况下禁止基于来自所述控制部的操作信号的所述驱动电路的工作。
本发明的洗衣机中，优选的是，具备多个所述安全电路，在多个所述安全电路全部为允许的情况下，允许基于来自所述控制部的操作信号的所述驱动电路的工作。
本发明的洗衣机中，优选的是，具备安全基板，所述安全基板具有多个所述安全电路和接收来自所述控制部的操作信号且将该操作信号提供给所述驱动电路的操作接收部，多个所述安全电路分别具有：阈值设定部，设定与所述规定转速对应的阈值，该阈值用于判定是否允许基于来自所述控制部的操作信号的所述驱动电路的工作；以及驱动电源切断部，切换供电线与所述驱动电路的通断状态，多个所述安全电路以串联的方式配置，在多个所述安全电路全部为允许的情况下，根据所述操作接收部所接收到的操作信号来向所述驱动电路供电而使所述驱动电路工作。
本发明的洗衣机中，优选的是，多个所述安全电路还分别具有检测所述滚筒的转速的转速检测部，多个所述转速检测部中的一部分转速检测部为检测旋转脉冲的下降的有源L型转速检测部，多个所述转速检测部中的另一部分转速检测部为检测旋转脉冲的上升的有源H型转速检测部。
本发明的洗衣机中，优选的是，所述安全电路由硬件构成。
本发明的洗衣机中，优选的是，所述安全电路由不同于所述控制部的电路基板构成。
发明效果
本发明的洗衣机具备安全电路，该安全电路在滚筒的转速为预先确定的规定转速以下的情况下允许基于来自控制部的操作信号的驱动电路的工作，并且在滚筒的转速超过规定转速的情况下禁止基于来自控制部的操作信号的驱动电路的工作。由此，由于在滚筒的转速超过规定转速的情况下，安全电路禁止基于来自控制部的操作信号的驱动电路的工作，因此能防止由于程序故障、电干扰等所引发的误工作而从控制部提供操作信号给驱动电路，并因该操作信号而使得锁门状态被解除。
本发明的洗衣机中，由于只有在多个安全电路全部为允许的情况下才允许基于来自控制部的操作信号的驱动电路的工作，因此即使万一多个安全电路中的某个安全电路误工作，也能可靠地防止锁门状态被解除。
本发明的洗衣机中，多个安全电路以串联的方式配置，在多个安全电路全部为允许的情况下，驱动电路被供电从而进行工作。因此，能通过停止供电来可靠地防止锁门状态被解除。
本发明的洗衣机中，通过对多个安全电路分别设置转速检测部并且并用有源L型转速检测部和有源H型转速检测部，能可靠地进行脉冲边沿的检测。
本发明的洗衣机中，由于安全电路由硬件构成，因此能防止因程序故障而使得锁门状态被解除。
本发明的洗衣机中，由于安全电路由不同于控制部的电路基板构成，因此通过设为物理上不同的基板，电路设计、安全性适当与否的认定的便利性提高。
附图说明
图1是本发明的实施方式的洗衣机100的示意性剖视图。
图2是图1的洗衣机100的控制框图。
图3是图1的洗衣机100的电路图。
图4是对图1的洗衣机100的锁门动作进行说明的图。
图5是现有的洗衣机的电路图。
附图标记说明
1：箱体；4：滚筒；6：门；6A：锁门装置；20：控制部；30：安全基板；31：驱动电路；50、50a：安全电路；51：操作接收部；53、53a：转速检测部；54：阈值设定部；55：驱动电源切断部；100：洗衣机。
具体实施方式
以下，参照附图对本发明的实施方式的洗衣机100进行说明。图1是本发明的实施方式的洗衣机100的示意性剖视图。
如图1所示，洗衣机100中，在箱形状的箱体1的内部配置有大致圆筒形状的外筒2，在外筒2的内部，通过沿前后方向延伸的主轴5而轴支承有用于收容洗涤物的大致圆筒形状的滚筒4。形成于外筒2的前表面的衣物投入口2a由门6开闭，能在门6敞开的状态下向滚筒4内投取洗涤物。
滚筒4能绕沿水平方向的旋转轴旋转。在滚筒4的周面穿设有许多通液孔4a，在清洗、漂洗时供给至外筒2内的溶剂穿过通液孔4a流入滚筒4内，离心脱液时在滚筒4内从洗涤物中排出的溶剂穿过通液孔4a向外筒2侧飞散。
主轴5以自由旋转的方式由装接于外筒2的背面壁的轴承5a支承，进而，在向后方突出的主轴5的顶端装配有主带轮8。在箱体1的底部设置有马达9，在马达9的旋转轴装配有马达带轮10。马达带轮10的旋转动力经由同步带11传递至主带轮8。由此，当马达9被驱动时，滚筒4以马达9的转速按规定的减速比减速后的转速，以主轴5为中心进行旋转。
外筒2的背面壁的上部与设置有供液阀12a的供液管12连接，当供液阀12a打开时，溶剂经由供液管12供给向外筒2。设置于外筒2的底部的排液口与设置有排液阀16a的排液管16连接，当排液阀16a打开时，外筒2内的溶剂穿过排液管16排出到机外。
在箱体1的前表面设置有用于阻止门6敞开的锁门装置6A。锁门装置6A在 滚筒4的转速为预先确定的规定转速以下的情况下，被控制为门6能敞开的解锁状态，在滚筒4的转速超过规定转速的情况下，被控制为门6不能敞开的锁门状态。
图2是本实施方式的洗衣机100的控制框图。洗衣机100的控制部20由例如微型计算机等构成，具备CPU、储存有控制洗衣机100的工作的程序的ROM以及临时存储执行上述程序时所用的数据等的RAM。洗衣机100的运转工作由控制部20控制。
锁门装置6A具有卡定部18，卡定部18在锁门状态下配置在将门6卡定的卡定位置以便阻止门6敞开，并且在解锁状态下配置在不卡定门6的解除位置以便能敞开门6。
锁门装置6A包括作为驱动装置的螺线管18a，以便将卡定部18的位置切换为卡定位置和解除位置中的某一方。
通过由洗衣机100的控制部20提供的操作信号(螺线管电源和锁门信号或解锁信号)来控制锁门装置6A。
具体而言，在由控制部20提供了螺线管电源和锁门信号的情况下，锁门装置6A通过螺线管18a将卡定部18移动至卡定位置而切换为锁门状态。在由控制部20提供了螺线管电源和解锁信号的情况下，锁门装置6A通过螺线管18a将卡定部18移动至解除位置而切换为解锁状态。
洗衣机100具有安全基板30和控制锁门装置6A的驱动电路33。驱动电路31为用于驱动螺线管18a的电路，基于来自控制部20的操作信号进行工作。
安全基板30具有两个安全电路50、50a和接收来自控制部20的操作信号的操作接收部51。安全基板30与洗衣机电源和螺线管电源连接。
两个安全电路50、50a分别是用于防止在门的锁定不应该被解除的状态下门的锁定被锁门装置6A解除的电路。
具体而言，两个安全电路50、50a分别在滚筒4的转速为预先确定的规定转速以下的情况下允许基于来自控制部20的操作信号的驱动电路31的工作，在滚筒4的转速超过规定转速的情况下禁止基于来自控制部20的操作信号的驱 动电路31的工作。
本实施方式中，在安全基板30中，两个安全电路50、50a以串联的方式配置于螺线管电源与操作接收部51之间，操作接收部51经由两个安全电路50、50a与螺线管电源连接。控制部20在控制螺线管18a时会将作为操作信号的螺线管电源提供给操作接收部51，但是只有在两个安全电路50、50a双方都允许了基于来自控制部20的操作信号的驱动电路31的工作的情况下，螺线管电源才会被提供给驱动电路31。
在螺线管电源被提供给驱动电路31的状态下，操作接收部51接收到来自控制部20的门锁信号或解锁信号的操作信号时，该操作信号被提供给驱动电路31，基于该操作信号的驱动电路31的工作(锁门或解锁)被实施。
与此相对，在螺线管电源未被提供给驱动电路31的状态下，即使操作接收部51接收到了来自控制部20的锁门信号或解锁信号的操作信号，该操作信号也不会被提供给驱动电路31，不会实施基于该操作信号的驱动电路31的工作(锁门或解锁)。
安全电路50具有转速检测部53、阈值设定部54以及驱动电源切断部55。在转速检测部53与驱动电源切断部55之间配置有光电耦合器58。
转速检测部53基于来自旋转传感器56的检测信号，输出与滚筒4的转速对应的脉冲信号。从转速检测部53输出的脉冲信号的间隔在滚筒4的转速变高时变短，在滚筒4的转速变低时变长。因此，能基于从转速检测部53输出的脉冲信号的间隔的变化来检测出滚筒4的转速的变化。
如上所述，锁门装置6A在滚筒4的转速为规定转速以下的情况下切换为解锁状态，在滚筒4的转速超过规定转速的情况下切换为锁门状态。
因此，如果以滚筒4的转速为规定转速时的脉冲信号的间隔来作为阈值t，那么在脉冲信号的间隔为阈值t以上的情况下切换为解锁状态，在脉冲信号的间隔比阈值t短的情况下切换为锁门状态。
阈值设定部54设定用于判定是否允许基于来自控制部20的操作信号的驱动电路31的工作的阈值。具体而言，阈值设定部54设定表示滚筒4的转速为规定转速时的脉冲信号的间隔的阈值t。
驱动电源切断部55切换从螺线管电源向驱动电路31的供电线的通断状态。具体而言，驱动电源切断部55在滚筒4的转速为规定转速以下的情况下不切断电源以便将螺线管电源提供给驱动电路31，并且在滚筒4的转速超过规定转速的情况下切断电源以便不将螺线管电源提供给驱动电路31。
基于图3对形成于安全基板30的安全电路50、50a的具体结构进行说明。
安全电路50具有D触发器60和晶体管61、62、63。D触发器60以旋转脉冲信号的上升(上升沿)为触发。
D触发器60具有D端子、CK端子、Q端子、Q’端子、CLR端子以及PR端子。D端子和PR端子与额定电压Vcc的电压源64连接。CK端子经由光电耦合器58与转速检测部53连接。
电阻65的一端与Q端子连接，电阻65的另一端与电容器66的一端连接。电容器66的另一端接地。Q’端子与晶体管61的基极连接。
晶体管62的集电极与额定电压Vcc的电压源68连接，并且与D触发器60的CLR端子连接。晶体管62的发射极接地。晶体管62的基极与位于电阻65与电容器66之间的连接点P连接。
晶体管63的集电极与晶体管62的基极连接，晶体管63的发射极接地。晶体管63的基极与CK端子连接。
安全电路50中，阈值设定部54包括晶体管63、电阻65以及电容器66。因此，阈值设定部54中，将由电阻65的电阻值和电容器66的电容值确定的RC时间常数设定为阈值t。晶体管63用于将阈值设定部54的电容器66放电，重置阈值设定部54。
安全电路50中，驱动电源切断部55包括阈值设定部54、D触发器60以及晶体管61、62。
与安全电路50相同，安全电路50a具有转速检测部53a、阈值设定部54以及驱动电源切断部55。安全电路50a的转速检测部53a基于来自旋转传感器56a的检测信号，输出与滚筒4的转速对应的脉冲信号。
与安全电路50相同，安全电路50a具有D触发器60和晶体管61a、62、63。 安全电路50a中的D触发器60和晶体管61a、62、63的连接方法与安全电路50相同，相同的部分省略详细说明。
对安全电路50和安全电路50a的不同点进行说明，安全电路50的晶体管61的集电极与螺线管电源连接，晶体管61的发射极与安全电路50a的晶体管61a的集电极连接。安全电路50a的晶体管61a的发射极与操作接收部51连接。
安全电路50中，D触发器60的CK端子经由光电耦合器58与转速检测部53a连接，与此相对，安全电路50a中，D触发器60的CK端子以不经由光电耦合器58的方式与转速检测部53a连接。
基于图3和图4对洗衣机100的锁门动作进行说明。
当洗衣机100中滚筒4被旋转驱动时，安全电路50的转速检测部53和安全电路50a的转速检测部53a分别检测滚筒4的转速并输出与检测到的转速对应的旋转脉冲信号。
首先，对安全电路50进行说明，由转速检测部53检测到的旋转脉冲信号在通过光电耦合器58而反转了Hi和Lo的状态下被输入至作为D触发器60的时钟输入的CK端子。如此一来，D端子的状态与旋转脉冲信号的上升同步地输出至Q端子和作为其反转输出的Q’端子。
如图4的(a)和图4的(b)所示，在初始状态下，D触发器60为旋转脉冲信号的Lo，存储D端子的信号状态，Q端子变为Lo，Q’端子变为相反值Hi。由此，通过来自触发器60的Q’端子的Hi输出，晶体管61被接通。因此，螺线管电源与驱动电路31连接。
然后，D触发器60以旋转脉冲信号的上升(上升沿)为触发，并存储D端子的信号状态，Q端子变为Hi，Q’端子变为相反值Lo，并且晶体管63瞬间接通，重置阈值设定部54。由此，通过来自触发器60的Q’端子的Lo输出，晶体管61被接通。因此，从螺线管电源向驱动电路31的供电线被切断。
如果从供电线被切断之后到进入下一个触发为止所花费的时间为由阈值设定部54设定的阈值t以上的话，如图4的(a)所示，晶体管62接通而被输入到CLR端子，Q端子和Q’端子的状态被复位，Q端子变为Lo，Q’端子变为Hi。因此，晶体管61接通，来自螺线管电源的电流从晶体管61的集电极流向发射 极。
与此相对，到进入下一个触发为止的时间比阈值设定部54所设定的阈值t短的情况下，如图4的(b)所示，由于晶体管62不会变化为接通，因此Q’端子维持为Lo。由此，通过来自D触发器60的Q’端子的Lo输出，晶体管61维持断开状态。因此，来自螺线管电源的电流不会从晶体管61的集电极流向发射极。
同样地，对安全电路50a进行说明，由转速检测部53a检测到的旋转脉冲信号在Hi和Lo没有反转的状态下被输入至作为D触发器60的时钟输入的CK端子。如此一来，D端子的状态与旋转脉冲信号的上升同步地被输出至Q端子和作为其反转输出的Q’端子。
安全电路50a中，旋转脉冲信号被输入D触发器60的CK端子之后的工作与安全电路50一样，省略其详细说明。
如上所述，安全电路50、50a中，在滚筒4的转速为规定转速以下的情况下，以脉冲信号的上升沿为触发，断开晶体管61、61a，将螺线管电源切断规定时间。然后，在直到经过规定时间为止都没有出现下一个脉冲信号的上升沿的情况下，在经过了规定时间时恢复到不切断螺线管电源的状态。因此，由于切换为螺线管电源被提供给驱动电路31的状态，因此在这种状态下从控制部50提供解锁信号时，驱动电路31实施向解锁状态的切换。
与此相对，安全电路50、50a中，在滚筒4的转速超过规定转速的情况下，以脉冲信号的上升沿为触发，断开晶体管61、61a，将螺线管电源切断规定时间。然后，直到经过规定时间为止，以下一个脉冲信号的上升沿为触发，断开晶体管61、61a，将螺线管电源切断规定时间。因此，由于切断螺线管电源的状态一直持续，因此在这种状态下，即使由控制部50提供了解锁信号，驱动电路31也不会实施向解锁状态的切换。
本实施方式的洗衣机100具备：滚筒4，配置于箱体1内；锁门装置6A，将可开闭地设置于箱体1的门6切换为锁门状态或解锁状态；控制部20，输出提供给对锁门装置6A进行控制的驱动电路31的操作信号；以及安全电路50、50a，在滚筒4的转速为预先确定的规定转速以下的情况下允许基于来自控制部 20的操作信号的驱动电路31的工作，并且在滚筒4的转速超过规定转速的情况下禁止基于来自控制部20的操作信号的驱动电路31的工作。
由此，本实施方式的洗衣机100中具备安全电路50、50a，该安全电路50、50a在滚筒4的转速为规定转速以下的情况下允许基于来自控制部20的操作信号的驱动电路31的工作，并且在滚筒4的转速超过规定转速的情况下禁止基于来自控制部20的操作信号的驱动电路31的工作。由此，由于在滚筒4的转速超过规定转速的情况下，安全电路50、50a禁止基于来自控制部20的操作信号的驱动电路31的工作，因此能防止由于程序故障、电干扰等所引发的误工作而使得操作信号从控制部20被提供给驱动电路31并因该操作信号而使得锁门状态被解除。
本实施方式的洗衣机100中具备多个安全电路50、50a，在多个安全电路50、50a全部为允许的情况下，允许基于来自控制部20的操作信号的驱动电路31的工作。
由此，本实施方式的洗衣机100中，由于只有在多个安全电路50、50a全部为允许的情况下才允许基于来自控制部20的操作信号的驱动电路31的工作，因此即使万一多个安全电路50、50a中的某个安全电路误工作，也能可靠地防止锁门状态被解除。
本实施方式的洗衣机100中具备安全基板30，该安全基板30具有多个安全电路50、50a和接收来自控制部20的操作信号并且将该操作信号提供给驱动电路31的操作接收部51，多个安全电路50、50a分别具有：阈值设定部54，设定与规定转速对应的阈值t，该阈值t用于判定是否允许基于来自控制部20的操作信号的驱动电路31的工作；以及驱动电源切断部55，切换供电线与驱动电路31的通断状态，多个安全电路50、50a以串联的方式配置，在多个安全电路50、50a全部为允许的情况下，根据操作接收部51所接收到的操作信号来向驱动电路31供电而使驱动电路31工作。
由此，本实施方式的洗衣机100中，多个安全电路50、50a以串联的方式配置，在多个安全电路50、50a全部为允许的情况下，驱动电路31被供电从而进行工作。因此，能通过停止供电来可靠地防止锁门状态被解除。
本实施方式的洗衣机100中，多个安全电路50、50a还分别具有检测滚筒4的转速的转速检测部53、53a，转速检测部53为检测旋转脉冲的下降的有源L型转速检测部，转速检测部53a为检测旋转脉冲的上升的有源H型转速检测部。
由此，本实施方式的洗衣机100中，通过对多个安全电路50、50a分别设置转速检测部53、53a并且并用有源L型转速检测部和有源H型转速检测部，能可靠地进行脉冲边沿的检测。
本实施方式的洗衣机100中，安全电路50、50a由硬件构成。
本实施方式的洗衣机100中，由于安全电路50、50a由硬件构成，因此能防止因程序故障而使得锁门状态被解除。
本实施方式的洗衣机100中，安全电路50、50a由不同于控制部20的电路基板构成。
本实施方式的洗衣机100中，由于安全电路50、50a由不同于控制部20的电路基板构成，因此通过设为物理上不同的基板，电路设计、安全性适当与否的认定的便利性提高。
以上，对本发明的实施方式进行了说明，但是各个部分的具体结构不仅局限于上述的实施方式。
例如，上述实施方式中，对具有能绕沿水平方向的旋转轴旋转的滚筒4的洗衣机100进行了说明，但是本发明也能应用于具有能绕相对于水平方向倾斜的旋转轴旋转的滚筒4的洗衣机。此外，本发明也能应用于具有能绕沿垂直方向的旋转轴旋转的洗涤桶(滚筒)的立式洗衣机。
上述实施方式中，对具有两个安全电路50、50a的情况进行了说明，但是安全电路的数量是任意的。本发明的洗衣机也可以具有一个或三个以上的安全电路。
上述实施方式中，对安全电路50、50a的例子进行了说明，但是安全电路50、50a的具体结构是任意的。因此，只要安全电路50、50a是在滚筒4的转速为规定转速以下的情况下允许基于来自控制部20的操作信号的驱动电路31的工作并且在滚筒4的转速超过规定转速的情况下禁止基于来自控制部20的操 作信号的驱动电的路31的工作的电路即可。
上述实施方式中，锁门装置6A具有螺线管18a来作为驱动卡定部18的驱动装置，但是驱动装置不局限于此。锁门装置6A中，也可以通过例如作为驱动装置的马达来驱动卡定部18。
上述实施方式中，在两个安全电路50、50a中，转速检测部53为有源L型转速检测部，转速检测部53a为有源H型转速检测部，由转速检测部53检测到的旋转脉冲信号通过光电耦合器58使得Hi和Lo反转，由此，使用了以旋转脉冲信号的上升(上升沿)为触发的同一种类的D触发器60，但是，也可以是，在安全电路50中，转速检测部53为有源L型转速检测部，对于由转速检测部53检测到的旋转脉冲信号，使用以旋转脉冲信号的下降(下降沿)为触发的D触发器60。

Claims (6)

  1. 一种洗衣机，其特征在于，具备：
    滚筒，配置于箱体内；
    锁门装置，将可开闭地设置于所述箱体的门切换为锁门状态或解锁状态；
    控制部，输出提供给对所述锁门装置进行控制的驱动电路的操作信号；以及
    安全电路，在所述滚筒的转速为预先确定的规定转速以下的情况下允许基于来自所述控制部的操作信号的所述驱动电路的工作，并且在所述滚筒的转速超过所述规定转速的情况下禁止基于来自所述控制部的操作信号的所述驱动电路的工作。
  2. 根据权利要求1所述的洗衣机，其特征在于，
    具备多个所述安全电路，
    在多个所述安全电路全部为允许的情况下，允许基于来自所述控制部的操作信号的所述驱动电路的工作。
  3. 根据权利要求2所述的洗衣机，其特征在于，
    具备安全基板，所述安全基板具有多个所述安全电路和接收来自所述控制部的操作信号并且将该操作信号提供给所述驱动电路的操作接收部，
    多个所述安全电路分别具有：
    阈值设定部，设定与所述规定转速对应的阈值，该阈值用于判定是否允许基于来自所述控制部的操作信号的所述驱动电路的工作；以及
    驱动电源切断部，切换供电线与所述驱动电路的通断状态，
    多个所述安全电路以串联的方式配置，在多个所述安全电路全部为允许的情况下，根据所述操作接收部所接收到的操作信号来向所述驱动电路供电而使所述驱动电路工作。
  4. 根据权利要求3所述的洗衣机，其特征在于，
    多个所述安全电路还分别具有检测所述滚筒的转速的转速检测部，
    多个所述转速检测部中的一部分转速检测部为检测旋转脉冲的下降的有源 L型转速检测部，多个所述转速检测部中的另一部分转速检测部为检测旋转脉冲的上升的有源H型转速检测部。
  5. 根据权利要求1～4的任意一项所述的洗衣机，其特征在于，
    所述安全电路由硬件构成。
  6. 根据权利要求1～5的任意一项所述的洗衣机，其特征在于，
    所述安全电路由不同于所述控制部的电路基板构成。
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