JP4586366B2 - Jet bath pump system - Google Patents

Description

  The present invention relates to a jet bath that circulates hot and cold water in a bathtub through a suction pipe and a discharge pipe and discharges the hot water from the discharge port provided in the bathtub into the bathtub. The present invention relates to a jet bath pump system that is reduced in cost and has good workability by reducing wiring.

  FIG. 11 is a block diagram of a conventional jet bath safety device, and FIG. 12 is a circuit block diagram of the conventional jet bath safety device. In FIG. 11, the jet bath safety device 101 has a pump 107 that connects the suction port 103 and the discharge port 104 provided on the side wall 102 a of the bathtub 102 together with the suction pipe 105 and the discharge pipe 106 outside the bathtub 102. is doing. A controller 108 is connected to the pump 107, and the suction pipe 105 is provided with a pressure switch 109 having a normally closed contact and a normally open contact, which will be described later, for detecting the pressure in the pipe.

  In FIG. 12, a controller 108 detects a current value of the pump motor 107a through a resistor 115 connected between a terminal 114 and a power supply circuit 111, and a power supply circuit 111 that supplies power to the pump motor 107a. And a control circuit 112 that opens and closes (turns on and off) a power supply switch 116 including an electronic switch such as a relay contact or a reed switch connected between the power supply circuit 111 and the terminal 113 based on a detection current of the current detection circuit 110. have.

  The terminals 113 and 114 of the controller 108 are connected to the other ends of the power cables 117a and 117b, one end of which is connected to the pump motor 107a. They are connected in series. A contact-protecting resistor 118 is connected in parallel to the normally closed contact 109a of the pressure switch 109. The pressure switch 109 has a negative pressure of −20 to −40 kPa (preferably −30 kPa) or less in the suction pipe 105. The normally closed contact 109a is set to open when the pressure is reached.

  The control circuit 112 includes a CPU, RAM, ROM, and the like (not shown), and detects a power supply voltage on a primary side or a secondary side of the operation unit including a wired or wireless remote control or the power supply circuit 111 as necessary. And a power supply voltage detection circuit for opening and closing the power switch 116.

  FIG. 13 is a circuit block diagram of another conventional jet bath safety device. In the safety device 101, a pump motor 107a has a rotation speed feedback cable. In this case, two-phase cables are used as the power cables 117a and 117b and connected to the power circuit 111 of the controller 108, and the normally closed contact 109a of the pressure switch 109 is connected in series with the rotation speed feedback cable 117c. And connected to the rotation speed detection circuit 120 of the controller 108. Then, the control circuit 112 compares the rotation speed detected by the rotation speed detection circuit 120 with the reference rotation speed, thereby controlling the opening / closing of the power switch 116.

In this case, it is preferable to determine the abnormality by setting an upper limit reference rotation speed and a lower limit reference rotation speed, for example, and determining whether or not the detected rotation speed is within both reference rotation speeds. . Also in this safety device 101, the cables 117a to 117c of each phase of the three-phase pump motor 107a can be used for power supply and abnormality detection, and no dedicated cables are required (Patent Document 1).
JP 2002-195162 A

  However, the above-described conventional technique requires two power supply circuits for the pump motor 107a and the control circuit 112 as the power supply circuit 111, and there is a problem that the number of parts increases and the cost increases.

  Further, in the function of the jet bath pump system, it is essential that the capability of the pump 107 can be varied so that the strength of the jet can be changed according to the user's preference. However, in the prior art, there is no means to do so, and the user always receives a jet of the same strength, so that depending on the user, there is a problem that a physical problem occurs or the user feels unsatisfactory.

  In addition, since the contact point of the pressure switch 109 in a relatively humid place is connected to the power cable 117b, a dedicated connection cable with excellent moisture resistance and durability is required, which increases costs and is sufficient for a long period of time. There was a problem that could not secure the reliability.

  Furthermore, the number of rotations is detected, and the power switch 116 is opened from the detected number of rotations to ensure safety. However, an additional cable is required to detect the number of rotations, resulting in increased costs. Since the pump motor 107a is disposed in a relatively humid place, there has been a problem that sufficient reliability cannot be ensured for a long time with respect to detection of the rotational speed.

  The present invention solves the above-mentioned conventional problems, and there are provided a plurality of means for stopping the pump in the event of an abnormality to ensure sufficient safety as well as an environment where the surrounding environment is not questioned about moisture resistance. It is possible to ensure sufficient reliability and to share the power supply for the pump motor and the control power supply, to simplify the power supply circuit, and to make the power supply voltage variable. It is an object of the present invention to provide a jet bath pump system suited to the user's preference by changing the power supply voltage by changing the power supply voltage by using a DC brushless motor as the power source.

In order to solve the above-mentioned problems, a jet bath pump system according to the present invention uses a control unit including a pump drive power supply circuit and a pump control device, and a DC pump capable of varying the capacity of a pump for circulating bath water. In the jet pump bus system in which the unit and the DC pump are separated, the pump drive power supply circuit is a variable DC power supply circuit, the voltage conversion device converts the stable voltage from the variable DC power supply circuit to drive the control unit, and A low voltage detection circuit that is fed by the variable DC power supply circuit and determines whether the output voltage value of the variable DC power supply circuit is lower than a preset threshold voltage, and the operation of the pump according to the output signal of the low voltage detection circuit and a DC pump features a pump driving circuit for performing ON / OFF, when driving the DC pump PWM control An input analog signal to the PWM signal generation circuit is used as an output signal of the low voltage detection circuit. The low voltage detection circuit sets the duty output of the PWM signal to 0% when the voltage of the variable DC power supply circuit is equal to or lower than a predetermined V0. In the voltage step V1 next to V0, the duty output is set to 100% .

  Further preferably, in the control unit, a current-voltage conversion circuit for converting the entire current waveform of the variable DC power supply circuit into a voltage waveform, an amplification circuit for amplifying the output signal of the current-voltage conversion circuit, and an output of the amplification circuit A rotation speed detection circuit comprising a comparison circuit for comparing a signal with a preset threshold voltage, and receiving the output signal of the rotation speed detection circuit, the power supply to the DC pump when the control unit has an abnormal rotation speed A safety device is provided that opens the contact of the relay by cutting off the power to the coil of the normally open contact that shuts off the supply.

Preferably, a low voltage processing circuit is provided for stopping power supply to the magnetic pole position detection sensor that receives the output signal of the low voltage detection circuit and detects the magnetic pole position of the magnet rotor of the DC pump.

  According to the present invention, it is possible to secure a plurality of safety devices for the low voltage detection circuit to operate by setting the output of the normally open contact relay and the variable DC stabilized power supply to the lower limit value.

  In addition, the connection to the pump motor is only a two-core cable for power supply, and the dedicated cable is reduced in wiring, so that the cost can be reduced, the workability can be improved and the reliability can be improved.

  Also, by changing the power supply voltage of the variable DC power supply circuit, the pump stops when the power supply voltage is less than V0, and if the power supply voltage is increased beyond that, the pump's ability can be changed to match the size of the user. You can get a jet that suits your taste.

  The output of the variable DC power supply circuit is shared between the power supply for the pump motor and the power supply for the control circuit, the voltage at which the control circuit operates when the power supply voltage is V0 or less is set as the lower limit value of the power supply voltage, and the control circuit operates stably. In addition, since the output voltage is low, this time is set as the system standby, and the standby power can be reduced to realize energy saving.

(Embodiment 1)
Embodiment 1 of the present invention will be described below. 1 is a block diagram of a jet bath pump system according to Embodiment 1 of the present invention, FIG. 2 is a low-voltage detection circuit diagram according to Embodiment 1 of the present invention, and FIG. 3 is a variable DC power supply according to Embodiment 1 of the present invention. It is a pump control state diagram by voltage.

In FIG. 1, reference numeral 11 denotes a variable DC power supply circuit for simultaneously generating power supplies for the control circuit 12 and the pump motor 7a, and a switching power supply is optimal. This is because the maximum power consumption per general jet bath pump is about 200 W, and the weight of the commercial transformer type power supply circuit is about 5 kg, which is a problem. Weight becomes almost 2kg about weight by the switching power supply circuit is Fig.

  Further, the configuration of the power supply for the control circuit 12 can use a dropper system from the power supply for the pump motor 7a, and there is an advantage that the circuit configuration is simplified. The control circuit 12 is operated by supplying power from the variable DC power supply circuit 11 through the control circuit power supply line 13, and mainly controls the voltage of the variable DC power supply circuit 11 by a circuit equipped with a microcomputer or the like, or a jet bus pump system. The user inputs a signal from the operation unit 26 for remote operation via the remote operation signal line 25, and controls the jet bath pump system accordingly.

  The variable DC power supply circuit 11 applies DC power to the low voltage detection circuit 22 and the pump motor drive circuit 24 through the pump motor DC power cables 21a and 21b. Therefore, the low voltage detection circuit 22 determines the magnitude of the applied voltage. When the voltage is lower than a certain voltage level, the pump is in a standby state, and when the voltage is higher than a certain voltage, the pump is in an operating state. This is transmitted to the pump motor drive circuit 24 via the low voltage detection circuit output signal line 23.

  The pump motor drive circuit 24 receives the signal and determines ON / OFF of the pump operation. Further, in the pump ON state (operation state), the pump motor drive circuit 24 according to the magnitude of the voltage applied from the variable DC power supply circuit 11. The ability of 7a is varied. As a result, the control circuit 12 controls the voltage of the variable DC power supply circuit 11 according to the capability of the jet bath system set by the operation unit 26.

  Next, the low voltage detection circuit 22 will be described with reference to FIG. R1 to R5 are resistors, ZD1 and 2 are Zener diodes, and Q1 is an N-type transistor. The most important factor in the low voltage detection circuit 22 is the setting of the Zener diode ZD1. ZD1 is preferably set to an intermediate value between the output voltage of the variable DC power supply circuit 11 and the voltage level in the standby state and the voltage level at the minimum capacity in the pump operation state. ZD2 is for overvoltage protection when the low voltage detection circuit analog signal line 23-2 is used. Q1 is an open collector output transistor for digitally telling whether the pump is in a standby state or an operating state. The pump motor drive circuit 24 is connected via a low voltage detection circuit ON / OFF signal line 23-1. To be told. However, the low voltage detection circuit 22 may be provided on the same substrate as the pump motor drive circuit 24.

  Next, the output voltage of the variable DC power supply circuit 11 and the operation control state of the pump will be described with reference to FIG. FIG. 3 shows a case where the variable DC power supply circuit 11 is controlled by the control circuit 12 at six voltage steps of V0, V1, V2, V3, V4, and V5 as output voltage levels. In FIG. 3, in the low voltage detection circuit 22, the setting of the Zener diode ZD1 is set to approximately 20V. Therefore, at the lowest control voltage V0 (15V), the pump is in a standby state, and from V1 to V5 is in a pump operation state, which is a drive voltage variable range for driving the pump. In this range, the voltage level determines the capacity of the pump (pump motor), and the larger the capacity, the larger the capacity.

(Embodiment 2)
FIG. 4 is a block diagram of a jet bath pump system using the rotational speed detection in the second embodiment of the present invention, FIG. 5 is a rotational speed detection circuit diagram in the second embodiment of the present invention, and FIG. 6 is an implementation of the present invention. It is a wave form diagram in each point of the rotation speed detection circuit in the form 2 of. In addition, the same code | symbol is attached | subjected to the same element as Embodiment 1, and description is abbreviate | omitted.

  In FIG. 4, in the means for stopping the pump, in the first embodiment, the output voltage value of the variable DC power supply circuit 11 is controlled to be lower than the detection voltage of the low voltage detection circuit 22. Separately, means for turning off the power relay 16 is provided by the control circuit 12. As a result, the standby power consumption of the jet bus pump system is reduced to a total of about 3 W, with the standby power of the pump unit being 0 W, while the total of the pump unit and the control unit is conventionally about 5 W.

  Further, the output signal of the rotation speed detection circuit 20 provided in the control unit 8 is determined by the control circuit 12 to determine the state of the pump. Here, by providing the rotation speed detection circuit 20 in the control unit 8, the number of lead wires of about 4 to 5 m for connecting to the pump motor drive circuit 24 can be reduced by one, and the cost can be reduced.

In FIG. 5, a resistor R6 is a shunt resistor for converting the total motor current flowing into the voltage into a voltage. The output voltage waveform of several tens to several hundreds mV is amplified by OP1 (op amp), and the amplified number V Is compared with the voltage set by the resistors R10 and R11 by the comparator COMP1. The output signal of the comparator COMP1 is subjected to waveform shaping and frequency division by a flip-flop circuit 29 of a flip-flop digital ICIC1 (hereinafter referred to as IC1). The output signal of this IC1 is handled in the control circuit 12 as a rotation speed signal. Using the rotation number signal, the control circuit 12 determines whether the pump state is rotating normally or an abnormal state such as idling or lock operation.

  FIG. 6 shows waveforms at each point of the rotation speed detection circuit 20. There are three waveforms 1, 2, and 3, and the signal amplified by the operational amplifier OP 1 becomes a voltage amplified signal waveform 1 after voltage conversion of the entire current waveform, and the output signal of the comparator COMP 1 is changed to the timing signal waveform 2 for switching the phase, IC 1 The output signal is a rotational speed signal waveform 3. The voltage amplification signal waveform 1 after voltage conversion of the total current waveform is a sawtooth shape, and the drop in the voltage value represents the phase switching timing. That is, the rotation speed detection circuit 20 is characterized in that the rotation speed signal is generated from the phase switching timing in the entire current waveform of the motor. For example, in an 8-pole magnet three-phase DC brushless motor, the phase switching timing is performed 24 times while the rotor rotates once. That is, in the output signal waveform 3 of IC1, the magnet rotor has made one rotation in 12 cycles (12 pulses).

(Embodiment 3)
FIG. 7 is a low voltage detection circuit output signal processing circuit diagram according to the third embodiment of the present invention. Among the output signals of the low voltage detection circuit 22 described with reference to FIG. 2, the pump motor 7a is set to a low level as processing of the low voltage detection circuit output signal when the low voltage detection circuit ON / OFF signal line 23-1 is used. This is one of the means for setting the standby state at the time of voltage. The P-type transistor Q2 is connected to the low voltage detection circuit ON / OFF signal line 23-1, and the power to the hall sensors H1, H2, and H3 for detecting the magnetic pole position of the pump motor is turned ON / OFF. As a result, when the power to the hall sensor is turned off, the pump motor drive circuit 24 stops the pump motor 7a and realizes a standby state.

(Embodiment 4)
FIG. 8 is a low voltage detection circuit output signal processing circuit diagram according to the fourth embodiment of the present invention, and FIG. 9 is a variation diagram of the PWM signal according to the variable DC power supply voltage according to the fourth embodiment of the present invention. In FIG. 8, the pump motor drive circuit 24 capable of variable performance generally uses a PWM signal as the variable performance signal in many cases. Another means of low voltage detection circuit output signal processing in such a case will be described.

  In FIG. 8, the low voltage detection circuit analog signal line 23-2 which is an output signal of the low voltage detection circuit 22 is used, and the output signal of the triangular wave signal source 30 is compared by the comparator COMP2, and the output signal is compared with the PWM signal 31. It is what.

  In FIG. 9, when the output voltage of the variable DC power supply circuit 11 is V0, the duty of the PWM signal 31 is 0%. In the process up to the next voltage step V1, the duty of the PWM signal 31 is changed from 0% to 100. % And becomes 100% at the time of V1. When the voltage step is larger than V1, the duty of the PWM signal 31 remains 100%, and the variable capacity changes depending on the voltage of the DC power supplied to the pump motor drive circuit 24. That is, PAM control is used.

In addition, when the power supply relay 16 described in the second embodiment is not used in consideration of cost, the difference in standby power in the pump unit between the conventional technique and the present invention will be described. FIG. 10 is an explanatory diagram showing the difference in power consumption during standby when the power relay (switch) according to the first to fourth embodiments of the present invention and the conventional technique is not used. In the conventional method, since the capability is generally varied by the PWM signal, the power supply voltage to the pump motor is supplied by the maximum power supply. Therefore, about 2W of power is consumed during standby in the pump unit. On the other hand, in the present invention, the standby state of the pump motor 7a is realized by the output state of the variable DC power supply circuit 11, and since the power supply voltage is as low as V0, the standby power consumption of the pump unit at that time is about 0.3 W, which is a considerable reduction. Can be planned.

  As described above, according to the jet bath system of the present invention, particularly when the distance between the control circuit and the power supply circuit and the pump, the pump motor, and the drive circuit is long, or the pump, the pump motor, and the drive circuit are arranged. It is particularly useful as a jet bath pump system using a bathroom-related pump, when the place is installed in a place where the environment is severe such as humidity.

Block diagram of a jet bath pump system in Embodiment 1 of the present invention Low voltage detection circuit diagram in Embodiment 1 of the present invention Pump control state diagram by variable DC power supply voltage in Embodiment 1 of the present invention Block diagram of a jet bath pump system using rotational speed detection in Embodiment 2 of the present invention Rotational speed detection circuit diagram in Embodiment 2 of the present invention Waveform diagram at each point of the rotation speed detection circuit according to the second embodiment of the present invention Low voltage detection circuit output signal processing circuit diagram in Embodiment 3 of the present invention Low voltage detection circuit output signal processing circuit diagram in Embodiment 4 of the present invention Variation diagram of PWM signal by variable DC power supply voltage in Embodiment 4 of the present invention Explanatory drawing which shows the difference in the power consumption at the time of standby when not using the power supply relay (switch) in Embodiment 1-4 of this invention and the prior art Configuration diagram of a conventional jet bath safety device Circuit block diagram of a conventional jet bath safety device Circuit block diagram of another conventional jet bath safety device

Explanation of symbols

7, 107 Pump 7a, 107a Pump motor 8, 108 Control unit (controller)
11 variable DC power supply circuit 12, 112 control circuit 13 power line for control circuit 16, 116 power relay (switch)
20 Rotational speed detection (detection) circuit 21a, 21b Pump motor DC power cable 22 Low voltage detection circuit 23 Low voltage detection circuit output signal line 23-1 Low voltage detection circuit ON / OFF signal line 23-2 Low voltage detection circuit analog Signal line 24 Pump motor drive circuit 25 Remote operation signal line 26 (remote) operation unit 30 Triangular wave signal source 31 PWM signal 101 Safety device 102 Bathtub 103 Suction port 104 Discharge port 105 Suction piping 106 Discharge piping 109 Pressure switch 109a Normally closed contact 110 Current detection circuit 111 Power supply circuit 117a, 117b Power supply cable R1-R15 Resistor ZD1, ZD2 Zener diode Q1 N-type transistor Q2 P-type transistor IC1 Flip-flop digital IC
OP1 Operational amplifier COMP1, COMP2 Comparator H1, H2, H3 Pump motor magnetic pole position detection Hall sensor Waveform 1 Voltage amplification signal after voltage conversion of all current waveform Waveform 2 Phase switching timing signal Waveform 3 Speed signal

Claims (3)

In a jet bath pump system using a control unit including a pump drive power supply circuit and a pump control circuit and a DC pump capable of changing the capacity of a pump for circulating bath water, and separating the control unit and the DC pump, The pump drive power supply circuit is a variable DC power supply circuit, converts the variable DC power supply circuit into a stable voltage, drives the control unit, and is fed by the variable DC power supply circuit, the variable DC power supply circuit DC pump provided with a low voltage detection circuit for determining whether or not the output voltage value of the pump is lower than a preset threshold voltage, and a pump drive circuit for turning on / off the pump according to the output signal of the low voltage detection circuit with the door, the case where the DC pump driven by PWM control, input analog signal said low voltage detection times to the PWM signal generating circuit The low voltage detection circuit sets the duty output of the PWM signal to 0% when the voltage of the variable DC power supply circuit is equal to or lower than a predetermined voltage V0, and outputs the duty output at the voltage step V1 next to V0. A jet bath pump system characterized by being 100% .   In the control unit, a current-voltage conversion circuit that converts the entire current waveform of the variable DC power supply circuit into a voltage waveform, an amplification circuit that amplifies the output signal of the current-voltage conversion circuit, and an output signal of the amplification circuit are preset. A rotation speed detection circuit comprising a comparison circuit for comparing with the threshold voltage, and receiving the output signal of the rotation speed detection circuit, and shutting off the power supply to the DC pump when the control unit has an abnormal rotation speed The jet bath pump system according to claim 1, further comprising a safety device that opens the contact of the relay by turning off the energization of the coil of the normally open contact. The low voltage processing circuit which receives the output signal of the said low voltage detection circuit, and stops the electric power feeding to the magnetic pole position detection sensor which detects the magnetic pole position of the magnet rotor of a DC pump is provided. Jet bath pump system .

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