JP5949394B2 - Local cleaning equipment - Google Patents

Description

  The present invention relates to a local cleaning device, and more particularly to a local cleaning device in which measures against electric shock to a human body are taken.

  For electrical equipment that comes into contact with water, such as a local cleaning device, if there is a place where water and electrical components come into direct contact, take measures to prevent electric shock to prevent electric shock to the human body through water. Is done. For example, in Patent Document 1 below, in order to prevent an electric shock from an electrode of an electrolyzed water generating device that supplies electrolyzed water to a foot bath, a transformer that supplies voltage to the electrolyzed water generating device is used, and a voltage is applied to other electric circuits. Separated from the transformer to be supplied, an insulating transformer in which the primary winding and the secondary winding each have a double insulation structure is used as the two transformers.

JP 2003-310704 A

  In a local washing apparatus such as a warm water washing toilet seat, a temperature detection unit such as a heater that heats water, a thermistor that detects water temperature, and the supply of hot water is stopped when the water temperature rises abnormally. A temperature abnormality detection device is provided, and these members are usually grounded in the tank to prevent electric shock. Moreover, the energization part of each of these members is insulated with respect to each outline, and a double electric shock countermeasure is taken. Usually, of these members, the heater and the temperature detection part are covered with an insulating material and insulated, and then covered with a metal case that does not allow water to enter, so that the insulating member is in direct contact with water. On the other hand, in the temperature abnormality detection device, since the insulating member that covers the current-carrying part is in direct contact with water, the grounding may be incomplete, or the insulating member may be cracked, resulting in poor insulation. If you do, there is a possibility of electric shock to the human body.

  Therefore, as in the above cited reference 1, a method is conceivable in which the transformer that supplies power to the temperature abnormality detection device is separated from the transformer that supplies power to the heater and the temperature detection unit, and an insulating transformer is used as each transformer. However, in general, an insulating transformer is expensive, and using two of them increases the cost required for electric shock countermeasures. Further, when an insulating transformer is employed in these two electric systems, in order to enjoy the insulating effect, not only the transformer part but also the entire secondary circuit, that is, the entire electronic control unit (ECU) in the tank. Need to be insulated. Many insulating members are used for this insulation, and the manufacturing cost of the ECU increases.

  The problem to be solved by the present invention is to provide a local cleaning device in which a countermeasure against electric shock from a temperature abnormality detection device provided in a tank to a human body is applied at low cost.

  In order to solve the above-mentioned problem, a local cleaning device according to the present invention includes a heater that heats water in a tank that stores hot water so as to be supplied to the outside, a temperature detection unit that measures the water temperature in the tank, A temperature abnormality detector that shuts off the supply of hot water from the tank to the outside when the water temperature in the tank suddenly rises is provided in the tank in a state insulated from the water in the tank, and further, the heater, A power supply unit configured to supply power to the temperature detection unit and the temperature abnormality detection device; the power supply unit performs voltage conversion on the primary side circuit to which AC power is input and the power input to the primary side circuit; A first secondary circuit supplied for driving and controlling the heater and the temperature detection unit, and electric power input to the primary circuit are converted into voltage and supplied for driving and control of the temperature abnormality detection device. Second secondary side The primary side circuit and the first secondary side circuit are electrically non-insulated, and the primary side circuit and the second secondary side circuit are electrically non-insulated. The main point is that they are insulated.

  Here, voltage conversion from the primary side circuit to the first secondary side circuit and the second secondary side circuit is performed using a transformer, and the transformer is a primary winding constituting the primary side circuit. And a first secondary winding that converts the power input to the primary side circuit and outputs the voltage to the first secondary side circuit, and converts the power input to the primary side circuit to a voltage. A second secondary winding that outputs to the second secondary circuit, the primary winding and the first secondary winding are electrically non-insulated, and the primary It is preferable that the winding and the second secondary winding are electrically insulated.

  Further, the present invention relates to a water temperature abnormality in the tank that is output from the temperature abnormality detection device without forming an electrical connection between the first secondary circuit and the second secondary circuit. It is good to have an insulation circuit which can be transmitted to the control part which is contained in the 1st secondary side circuit and controls the heater and the temperature detection part.

  In addition, the heater and the temperature detection unit are respectively housed in a metal case that is provided in the tank and prevents water from entering the inside after the energization unit is insulated by an insulating member. The temperature abnormality detection device is disposed in the tank, and is accommodated in an insulating outer resin, and is disposed outside the metal case in a state where the insulating outer resin is in contact with water in the tank. Good.

  At this time, the metal case is preferably grounded.

  In the local cleaning device according to the above invention, if measures against electric shock are not taken, electric shock to the human body through water is caused by the alternating current of the primary circuit that enters the tank via the electric circuit of the temperature abnormality detection device. However, because the second secondary circuit that supplies power to the temperature abnormality detection device is insulated from the primary circuit, and the second secondary circuit is electrically independent, Electric shock to the human body via such a temperature abnormality detection device is prevented. On the other hand, the first secondary side circuit that supplies power to the heater and the temperature detection unit that is unlikely to cause an electric shock via water is not insulated from the primary side circuit, and the first secondary side circuit Since it is not necessary to use an insulating member or the like for insulating the material, the cost required for the insulating member is reduced. An increase in the size of the circuit board by using an insulating member for the first secondary circuit is also avoided.

  Here, when the voltage conversion from the primary side circuit to the first secondary side circuit and the second secondary side circuit is performed using the transformer as described above, the first secondary side circuit It is possible to easily construct a configuration in which the second side circuit is insulated from the primary circuit while the second side circuit is insulated from the primary circuit. Moreover, in addition to being able to supply voltage to two secondary side circuits from a single transformer that uses a single primary winding in common for the first secondary winding and the second secondary winding, Since the insulation between the windings is provided only between the primary winding and the second secondary winding, the cost for manufacturing the transformer part is suppressed.

  Furthermore, the electric power related to the abnormality of the water temperature in the tank output from the temperature abnormality detection device without forming an electrical connection between the first secondary circuit and the second secondary circuit. A first secondary circuit and a second secondary side if the first secondary circuit includes an insulation circuit that is included in the first secondary circuit and is capable of transmitting to a controller that controls the heater and the temperature detector; Necessary signals can be exchanged between the components of the two secondary circuits while maintaining the electrical insulation between the circuits.

  Further, when the heater and the temperature detecting unit are disposed in the tank in a state where the energizing unit is insulated by an insulating member and stored in the metal case as described above, the heater and Since the temperature detector does not come into direct contact with the water in the tank, even if the first secondary circuit supplying power to them is not insulated from the primary circuit, water is passed from the heater and / or temperature detector. The possibility of electric shock to the human body is further reduced. Furthermore, when the temperature abnormality detection device is accommodated in an insulating outer resin, and the insulating outer resin is disposed outside the metal case in contact with water in the tank, a heater and / or Even when an abnormality occurs in the temperature detection unit, the temperature detection device can block the supply of water to the outside without being affected by the abnormality.

  At this time, if the metal case is grounded, the heater and the temperature detector that are not insulated from the primary circuit are further prevented from leaking, and electric shock to the human body through water is prevented.

It is a perspective view showing the whole local cleaning device concerning one embodiment of the present invention. It is the schematic which shows the power supply part and control circuit of the said local washing | cleaning apparatus.

  Hereinafter, a local cleaning device according to an embodiment of the present invention will be described in detail with reference to the drawings. The local cleaning apparatus 1 is an apparatus that supplies hot water for human body local cleaning, such as a warm water cleaning toilet seat.

  FIG. 1 shows an example of a local cleaning apparatus. The local cleaning device 1 has a nozzle 2 provided behind the toilet seat 5, and cleans a human body part by ejecting hot water from the nozzle 2. The hot water supplied to the nozzle 2 is obtained from a water supply source 4 such as a public water supply, and is warmed and stored in a (hot water) tank 6. Water heating and hot water supply are controlled by the control means 3. The control means 3 includes various elements constituting the first secondary side circuit 20 and the second secondary side circuit 40 described later.

  Next, based on FIG. 2, the outline | summary of the power supply system and electric circuit of the local washing | cleaning apparatus 1 is demonstrated.

  In the tank 6, a heater 22 for heating water (a hot water), a water temperature detection unit 23 such as a thermistor for measuring the water temperature, and the emergency stop of the supply of hot water to the outside when the water temperature rises abnormally A temperature abnormality detecting device 42 is provided.

  The local cleaning apparatus 1 includes a primary circuit 10, a first secondary circuit 20, and a second secondary circuit 40. Although details will be described later, the first secondary circuit 20 is not electrically insulated from the primary circuit 10. On the other hand, the second secondary circuit 40 is electrically insulated from the primary circuit 10, and thus is also electrically insulated from the first secondary circuit 20. A primary winding 11 included in the primary side circuit 10, a first secondary winding 21 included in the first secondary side circuit 20, and a second secondary winding included in the second secondary side circuit 40. 41 constitutes a transformer 50.

  The primary side circuit 10 inputs, for example, alternating current acquired from the commercial power supply 12 to the primary winding 11. As the AC power source input to the primary circuit 10, not only the commercial power source 12, but also any AC power source such as a switching power source using a switching circuit can be used.

  The first secondary circuit 20 includes various devices such as a heater 22 and a temperature detection unit 23 in addition to the first secondary winding 21 that converts the power input to the primary winding 11 and outputs the voltage. And the control part (microcomputer) 24 for controlling them is mounted. As for the power source for driving and controlling the various devices including the heater 22 and the temperature detecting unit 23 and the control unit 24, the alternating current output from the first secondary winding 21 is rectified and smoothed by the diode 25 and the electrolytic capacitor 26. In response to stabilization by the series regulator 27, it is converted into a direct current having a predetermined voltage (first output voltage, for example, 12V) and supplied. In addition to the heater 22 and the temperature detector 23, the devices mounted on the first secondary circuit 20 include a heater drive circuit 28 that controls the heater 22, supply of hot water in the tank 6 to the outside, that is, to the nozzle 2. A water valve circuit 29 and a rotary valve 30 for controlling the supply of the oil are illustrated.

  The second secondary circuit 40 includes a temperature abnormality detection device 42 in addition to the second secondary winding 41 that converts the power input to the primary winding 11 and outputs the voltage. Of the various devices constituting the local cleaning device 1, only the temperature abnormality detection device 42 is mounted on the second secondary circuit 40, and other devices are not mounted. Other devices are mounted on the first secondary circuit 20 or another circuit that is electrically insulated from the second secondary circuit 40. The alternating current output from the second secondary winding 41 is rectified and smoothed by the diode 43 and the electrolytic capacitor 44 and converted into direct current having a predetermined voltage (second output voltage, for example, 12V), and the temperature abnormality detection device 42 is supplied as a power source.

  In the insulating transformer 50, the primary winding 11 and the first secondary winding 21 are not insulated and are not electrically insulated from each other. On the other hand, the primary winding 11 and the second secondary winding 41 are electrically insulated. This insulation is performed, for example, by forming a double insulation structure. Since the primary winding 11 and the second secondary winding 41 are electrically insulated, the first secondary winding 21 and the second secondary winding 41 are also electrically insulated. Will be.

  In addition, the second secondary circuit 40 includes a temperature abnormality detection device 42, a diode 43, and each element including the electrolytic capacitor 44, and all other components are electrically insulated from the outside and are electrically independent. ing. Together with the insulation in the transformer 50, the second secondary circuit 40 is electrically insulated from the primary circuit 10 and the first secondary circuit 20 as a whole.

  On the other hand, various devices, various elements, and the like constituting the first secondary circuit 20 are not subjected to special insulation treatment and insulation from the outside is not ensured. In addition to the fact that the transformer 50 is not insulated between the primary winding 11 and the first secondary winding 21, the entire first secondary circuit 20 is electrically insulated from the primary circuit 10. It is in a state that has not been done.

  Next, the configuration of equipment provided inside the tank 6 will be described. As described above, the heater 22, the temperature detection unit 23, and the temperature abnormality detection device 42 are provided inside the tank 6. The heater 22 and the temperature detection unit 23 are housed in the metal case 31 in a state where the energized portions are covered with an insulating material and insulated. That is, the energized portion is housed in the metal case 31 in a state of being insulated from the metal case 31. The metal case 31 is formed so that water does not enter the tank 6 even when the tank 6 is filled with water. With this configuration, the insulating material that covers the heater 22 and the current-carrying part of the temperature detection unit 23 does not come into contact with water, and the current-carrying part that is covered with the insulation material does not come into contact with water. Electric leakage does not occur from the temperature detection unit 23, and an electric shock via water from the heater 22 and the temperature detection unit 23 is prevented. Furthermore, since the metal case 31 is grounded, the insulating material covering the energization part and the metal case 31 are damaged, and the energization parts of the heater 22 and the temperature detection unit 23 come into contact with water. Even if a situation occurs, electric shock to the human body is prevented. Here, the metal case 31 is not necessarily required, but is contained in the metal case 31 in this manner as compared with the case where the insulating materials of the heater 22 and the temperature detection unit 23 are in direct contact with the water in the tank 6. The case where it does not come into contact with water is preferable in the event that the heater 22 and the insulating material of the temperature detection unit 23 are damaged, because electric shock is prevented from occurring.

  On the other hand, the temperature abnormality detection device 42 is not accommodated in the metal case 31 and is disposed outside the metal case 31. The temperature abnormality detection device 42 is mainly composed of a temperature-sensitive reed switch. When an abnormal temperature rise is detected, the water valve circuit 29 is cut off, and the supply of hot water from the tank 6 to the outside is immediately stopped. The hot water jet from can be stopped. The temperature abnormality detection device 42 is configured so that, even when an abnormality occurs in the heater 22 and / or the temperature detection unit 23, the supply of hot water to the outside can be stopped without being affected by the abnormality. As described above, it is spatially separated from the heater 22 and the temperature detector 23 and provided outside the metal case 31. The energization part of the temperature abnormality detection device 42 is accommodated in the insulating resin outer shell, but the insulating resin outer shell is different from the insulating material that covers the energization part of the heater 22 and the temperature detection unit 23, and the tank 6. Direct contact with the water inside.

  Signal transmission from the temperature-sensitive reed switch of the temperature abnormality detection device 42 to the water valve circuit 29 is performed via an insulating circuit 70 which is made of a photocoupler and can transmit signals in an insulating manner. The signal relayed to the insulation circuit 70 (temperature sensitive switch input) is transmitted to the water valve circuit 29 via the control unit 24. In this way, by performing signal transmission through the insulation circuit 70, the insulation between the second secondary circuit 40 and the first secondary circuit 20 and the primary circuit 10 is maintained while maintaining the insulation. Signals can be exchanged between the second secondary circuit 40 and the first secondary circuit 20.

  The temperature abnormality detection device 42 is configured such that the insulating resin shell is in direct contact with the hot water in the tank 6 as described above because of the necessity for control. In addition, when other components such as the heater 22 and the temperature detection unit 23 cause an abnormal operation due to some problem and the water in the tank 6 abnormally rises in temperature, the temperature abnormality detection device 42 performs the abnormal operation. The temperature abnormality detection device 42 is spatially separated from other devices such as the heater 22 and the temperature detection unit 23 so that the supply of hot water can be stopped immediately without being affected by It is configured on an independent electric circuit.

  Since the current-carrying part of the temperature abnormality detection device 42 is housed in the insulating outer resin, the insulation between the second secondary side circuit 40 and the primary side circuit 10 in the normal operation state. Regardless of the presence or absence, no leakage from the temperature abnormality detection device 42 occurs. However, as described above, since the second secondary circuit 40 is electrically insulated from the primary circuit 10, a crack or the like may occur in the insulating outer resin, which is caused by the insulating outer resin. Even if insulation is no longer maintained, the energization part of the temperature abnormality detection device 42 is electrically independent from the primary circuit 10, and the commercial power supply 12 enters the tank 6 through the temperature abnormality detection device 42. There is no leakage of the commercial power supply 12.

  However, since water has a certain degree of electrical conductivity, even if the second secondary circuit 40 is not insulated from the primary circuit 10 in this way, the metal case 31 must be grounded. For example, even if an electric current enters the tank 6 from the commercial power source 12, at least a part of the electric current is released to the ground potential through the water and the metal case 31, so that a serious electric shock can be avoided. However, because the second secondary circuit 40 is insulated from the primary circuit 10 as described above, the grounding of the metal case 31 is forgotten when the local cleaning device 1 is installed, or is temporarily connected for some reason. Even when the earth ground wiring is cut or the like, the commercial power source 12 does not enter the tank 6 and electric shock from the commercial power source 12 can be prevented.

  In the above configuration, the heater 22 and the current-carrying portion of the temperature detection unit 23 are double insulated due to the effect of the insulating material to be coated and the effect of preventing water intrusion into the metal case 31, and a metal in the immediate vicinity. Since the case 31 is grounded, the probability of causing a serious electric leakage is lower than that of the energization part of the temperature abnormality detection device 42. For this reason, the first secondary circuit 20 is not insulated from the primary circuit 10. If insulation is provided, insulation at the transistor 50 portion and insulation processing at the entire first secondary circuit 20 downstream from the first secondary winding 21 are required, and the cost and substrate required for this are required. Due to the large increase in space, no insulation is performed between the first secondary circuit 20 and the primary circuit 10 in the present invention.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said Example at all, A various change is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Local washing apparatus 6 Tank 10 Primary side circuit 11 Primary winding 20 First secondary side circuit 21 First secondary winding 22 Heater 23 Temperature detection part 24 Control part 31 Metal case 40 Second secondary side circuit 41 Second secondary winding 42 Temperature abnormality detection device 50 Transformer 70 Insulation circuit

Claims (5)

A heater that heats water in a tank that stores hot water so that it can be supplied to the outside, a temperature detection unit that measures the water temperature in the tank, and when the water temperature in the tank suddenly rises, A temperature abnormality detection device that shuts off the supply of hot water is provided in the tank in a state insulated from the water in the tank, and further, a power supply unit that supplies power to the heater, the temperature detection unit, and the temperature abnormality detection device Have
The power supply unit includes a primary side circuit to which AC power is input,
A first secondary circuit that converts the power input to the primary circuit and supplies it for driving and controlling the heater and the temperature detector, and converts the power input to the primary circuit to a voltage And a second secondary side circuit that supplies the temperature abnormality detection device for driving and control,
A local part that is electrically non-insulated between the primary side circuit and the first secondary side circuit, and is electrically isolated between the primary side circuit and the second secondary side circuit. Cleaning device.   Voltage conversion from the primary side circuit to the first secondary side circuit and the second secondary side circuit is performed using a transformer, and the transformer includes a primary winding that constitutes the primary side circuit, and A first secondary winding that converts the power input to the primary side circuit and outputs it to the first secondary side circuit; and converts the power input to the primary side circuit to a voltage and converts the power to the second secondary circuit. A second secondary winding that outputs to the secondary side circuit of the first, and the primary winding and the first secondary winding are electrically non-insulated, and the primary winding and The local cleaning apparatus according to claim 1, wherein the second secondary winding is electrically insulated from the second secondary winding.   An electrical signal relating to a water temperature abnormality in the tank that is output from the temperature abnormality detection device without forming an electrical connection between the first secondary circuit and the second secondary circuit. 3. The local cleaning device according to claim 1, further comprising an insulating circuit that is included in the first secondary circuit and can be transmitted to a control unit that controls the heater and the temperature detection unit.   In the state where the heater and the temperature detection unit are respectively housed in a metal case provided in the tank and prevented from entering water after the energization unit is insulated by an insulating member. The temperature abnormality detection device is disposed in a tank, and is housed in an insulating outer resin, and is disposed outside the metal case in a state where the insulating outer resin is in contact with water in the tank. The local cleaning apparatus in any one of -3.   The local cleaning apparatus according to claim 4, wherein the metal case is grounded.

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