Handwashing device

Abstract

To provide a hand washing device equipped with an ejector-type mixing nozzle, that is equipped with a means for preventing solidification of a washing liquid in a washing-liquid supply path.SOLUTION: A hand washing device 1 comprises: a first on-off valve 121 provided in a water supply path 12; a second on-off valve 131 provided in a washing liquid supply path 13; a third on-off valve 141 provided in a branch supply path connecting the downstream of the first on-off valve 121 and the downstream of the second on-off valve 131; and a control part 3 that opens and closes the first on-off valve 121, the second on-off valve 131 and the third on-off valve 141, wherein the control part 3 closes the second on-off valve 131 after discharging washing foam from a mixing nozzle 11, water is supplied from the water supply path 12 to the mixing nozzle 11 by opening the first on-off valve 121 and the third on-off valve 141, a washing liquid remaining in the washing liquid supply path 13 is washed away by sucking the water from the washing liquid supply path 13 through the branch supply path 14 and air from an air intake port 111 into the mixing nozzle 11, and the water is discharged from the mixing nozzle 11.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present invention relates to a handwashing device provided with a mixing nozzle that discharges cleaning foam by supplying water as a driving fluid and sucking and mixing a cleaning liquid and air as suction fluids.

Background Art

[0002] As a device for achieving good handwashing, there is a handwashing device provided with a mixing nozzle that discharges cleaning foam by supplying water as a driving fluid and sucking and mixing a cleaning liquid and air as suction fluids (Patent Document 1, Patent Document 2). The mixing nozzle is an ejector that uses water as a driving fluid and can suck and mix a cleaning liquid and air just by discharging the water supplied from the water supply pipe. Therefore, it has the advantage of not requiring a driving force for supplying the cleaning liquid and air. In addition, the ejector-type mixing nozzle is also excellent in that it can generate fine microbubbles by devising the internal structure.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the hand-washing apparatus disclosed in Patent Documents 1 and 2, the cleaning solution is drawn in through a cleaning solution supply passage connecting the cleaning solution tank and the mixing nozzle. Here, when the supply of water, which is the driving fluid, is stopped, the suction of the cleaning solution also stops, and the cleaning solution remains in the cleaning solution supply passage. Also, in order to discharge only water from the mixing nozzle, if the on / off valve provided in the cleaning solution supply passage is closed while the supply of water, which is the driving fluid, is continued, the suction of the cleaning solution stops, and the cleaning solution remains in the cleaning solution supply passage. The cleaning solution remaining in the cleaning solution supply passage solidifies, narrowing the cleaning solution supply passage, which weakens the suction of the cleaning solution the next time, or prevents the cleaning solution from being drawn into the mixing nozzle.

[0005] In a handwashing device equipped with an ejector-type mixing nozzle, residual cleaning solution is not a problem if the cleaning solution supply path is easy to maintain and replace. However, when a handwashing device equipped with an ejector-type mixing nozzle is used in a handwashing-linked door opening and closing system that opens and closes the door in conjunction with the handwashing device, for example, maintenance and replacement of the cleaning solution supply path are not easy. Therefore, considering the case where a handwashing device equipped with an ejector-type mixing nozzle is used in a handwashing-linked door opening and closing system, we investigated how to add a means to prevent the cleaning solution from solidifying in the cleaning solution supply path of a handwashing device equipped with an ejector-type mixing nozzle, in order to facilitate maintenance of the cleaning solution supply path and reduce the frequency of replacement. [Means for solving the problem]

[0006] The developed product is a hand-washing device equipped with a mixing nozzle that is supplied with water as a driving fluid, and draws in and mixes cleaning solution and air as suction fluids to discharge cleaning foam. The mixing nozzle has an air intake port, a first on-off valve is provided in the water supply passage that supplies water to the mixing nozzle, a second on-off valve is provided in the cleaning solution supply passage that supplies cleaning solution to the mixing nozzle, and a third on-off valve is provided in the branch supply passage connecting the downstream of the first on-off valve in the water supply passage and the downstream of the second on-off valve in the cleaning solution supply passage. The device is equipped with a control unit that opens and closes the first on-off valve, the second on-off valve, and the third on-off valve, and the control unit controls the first on-off valve and This hand-washing device is characterized by the following: by opening two on-off valves and closing a third on-off valve, water is supplied from the water supply passage to the mixing nozzle, cleaning liquid is drawn into the mixing nozzle from the cleaning liquid supply passage and air is drawn into the air intake port, and cleaning foam is discharged from the mixing nozzle; then, the control unit closes the second on-off valve and opens the first and third on-off valves, supplying water from the water supply passage to the mixing nozzle, supplying water from the cleaning liquid supply passage to the mixing nozzle via a branch supply passage, drawing air into the mixing nozzle from the air intake port to flush out any remaining cleaning liquid in the cleaning liquid supply passage, and discharging water from the mixing nozzle.

[0007] The hand-washing device of the present invention discharges cleaning foam from a mixing nozzle, and then supplies water to the mixing nozzle from a cleaning liquid supply passage via a branched supply passage, thereby flushing out any remaining cleaning liquid in the cleaning liquid supply passage. When flushing out the remaining cleaning liquid in the cleaning liquid supply passage begins, a small amount of cleaning foam is initially generated. However, if the discharge of water is started immediately after stopping the discharge of cleaning foam, the apparent time for discharging cleaning foam will only be slightly longer, making the small amount of foam generated less noticeable. If the small amount of foam generated is not particularly bothersome, the discharge of water may be stopped after a short delay. Since the purpose is to flush out the remaining cleaning liquid in the cleaning liquid supply passage, the water discharge may be stopped immediately after the small amount of foam has been discharged.

[0008] The control unit is a device that transmits control signals to open and close the first to third valves according to specific procedures and timeframes, and is composed of, for example, a computer. If the first to third valves are solenoid valves, the control signal is an electrical signal that opens and closes the first to third valves. If the first to third valves are mechanical valves, the control signal is an electrical signal that drives the respective drive mechanisms that open and close the first to third valves. In addition, the control unit may have the function of receiving electrical signals from, for example, a sensor that detects a worker's hand, as the starting point for controlling the first to third valves, or the function of transmitting electrical signals that control the drive mechanism of, for example, an automatic door, as the ending point for controlling the first to third valves.

[0009] Since the second and third on-off valves open and close alternately, they can be combined into a three-way valve. That is, the second and third on-off valves are composed of a three-way valve, with the path connecting the first input port and outlet of the three-way valve designated as the second on-off valve, and the path connecting the second input port and outlet of the three-way valve designated as the third on-off valve. The first input port is connected to the upstream side of the cleaning fluid supply path, the second input port is connected to the branch supply path, and the outlet is connected to the downstream side of the cleaning fluid supply path. A three-way valve with the path connecting the first input port and outlet designated as the second on-off valve and the path connecting the second input port and outlet designated as the third on-off valve has the advantage of simplifying and miniaturizing the supply path configuration compared to arranging the second and third on-off valves independently, and also reduces the number of controlled objects by one. [Effects of the Invention]

[0010] The hand-washing device of the present invention is equipped with a means to prevent solidification of the cleaning liquid, which, after discharging cleaning foam from the mixing nozzle, supplies water from the cleaning liquid supply passage to the mixing nozzle via a branch supply passage, thereby flushing out any cleaning liquid remaining in the cleaning liquid supply passage. This eliminates the need for maintenance of the cleaning liquid supply passage in principle and reduces the frequency of replacement of the cleaning liquid supply passage. This is achieved by providing a branch supply passage connecting the water supply passage and the cleaning liquid supply passage, and by having the control unit selectively open and close the second on-off valve of the cleaning liquid supply passage and the third on-off valve of the branch supply passage. As a result, the hand-washing device of the present invention, equipped with an ejector-type mixing nozzle, has the advantage of being easily usable in a hand-washing interlocking door opening and closing system.

[0011] The control unit can, for example, receive electrical signals from a sensor that detects the hands of an operator, and, as the endpoint of the control of the first to third on-off valves, it can also emit electrical signals to control, for example, the drive mechanism of an automatic door. From the perspective of these functions, the hand-washing device of the present invention is easily usable in a hand-washing-linked door opening and closing system. Thus, by enabling the washing liquid remaining in the washing liquid supply passage to be washed away, the hand-washing device of the present invention is essentially maintenance-free, reduces the frequency of replacement of the washing liquid supply passage, and is configured to be suitable for a hand-washing-linked door opening and closing system.

[0012] When the second and third on-off valves are combined into a three-way valve, the supply path configuration can be simplified and miniaturized compared to arranging the second and third on-off valves independently, and the number of controlled objects can be reduced by one. The simplification and miniaturization of the supply path configuration increases the flexibility of the layout when using the hand-washing device of the present invention in a hand-washing-linked door opening and closing system. Furthermore, the reduction of one controlled object allows for the construction of a system that can adequately handle sensors and door operation even when using an inexpensive control unit with a limited number of controlled objects. [Brief explanation of the drawing]

[0013] [Figure 1]This is a front view of a hand-washing linked door opening and closing system using the hand-washing device of the present invention. [Figure 2] This is a block diagram showing the configuration of the handwashing-linked door opening and closing system in this example. [Figure 3] This is a block diagram showing the operating state of the first procedure, which involves dispensing only water. [Figure 4] This is a block diagram showing the operating state of the second step, which involves dispensing cleaning foam. [Figure 5] This is a block diagram illustrating the operation state of the third step, which involves rinsing off the cleaning solution. [Figure 6] This block diagram shows the operating state of the fourth procedure, in which the discharge of water or washing foam has been stopped. [Figure 7] This block diagram shows the operating state of the fifth step, in which only water is discharged. [Figure 8] This is a block diagram showing the operational state of the sixth step, opening the door. [Figure 9] This is a block diagram illustrating the configuration of a handwashing-linked door opening and closing system, as in another example. [Modes for carrying out the invention]

[0014] The embodiments for carrying out the present invention will be described below with reference to the figures. As shown in Figures 1 and 2, the hand-washing device 1 of the present invention is used in a hand-washing interlocked door opening and closing system. The hand-washing device 1 of the present invention can wash away any remaining cleaning solution in the cleaning solution supply passage 13, thereby preventing the hand-washing device 1 from becoming unusable due to the solidification of the cleaning solution remaining in the cleaning solution supply passage 13, and consequently preventing the door 2 from being opened or closed.

[0015] The handwashing-linked door opening and closing system in this example opens and closes a door 2 that separates a sanitary area (e.g., inside a food factory, the back side in the drawing) and an unsanitary area (e.g., the external corridor of a food factory, the front side in the drawing) after an operator washes their hands in a predetermined handwashing procedure using a handwashing device 1 arranged to the left of the door 2. The control unit 3 of the handwashing device 1 in this example also controls the driving means 21 of the door 2 from the perspective of interlocking the handwashing device 1 and the door 2. Another control unit for controlling the driving means 21 of the door 2 may be provided and cooperate with the control unit 3 of the handwashing device 1.

[0016] The door 2 may be a hinged door or a sliding door as long as it can be opened and closed by the driving means 21. Also, the door panel constituting the door 2 may be one or two or more. When there are two or more door panels, the door panel to be opened and closed may be specified. The door 2 in this example is a sliding door with one door panel and opens to the right toward the drawing. The driving means 21 can use various conventionally known driving means, and examples include an electric motor and an electric cylinder. After finishing a predetermined handwashing procedure, the control unit 3 of the handwashing device sends an opening and closing signal to the driving means 21 and opens the door 2 for a certain period of time.

[0017] The handwashing device 1 in this example is configured with a control unit 3 that provides an ejector-type mixing nozzle 11 having an air inlet 111 at the discharge port, provides a first on-off valve 121 in a water supply line 12 that supplies water from a water supply to the mixing nozzle 11, connects a first input port 151 to the upstream side of a cleaning liquid supply line 13, connects a second input port 152 to a branch supply line 14 branched from downstream of the first on-off valve 121 of the water supply line 12, and provides a three-way valve 15 with an outlet 153 connected to the downstream side of the cleaning liquid supply line 13, and opens and closes the first on-off valve 121 and switches the three-way valve 15. The first on-off valve 121 and the three-way valve 15 in this example are solenoid valves that open, close, and switch the flow path by an electric signal.

[0018] In the handwashing device 1 of this example, a first on-off valve 121 and a three-way valve 15 are built into the faucet body 112 that protrudes into the washing bowl 18. The faucet body 112 is provided with a non-contact sensor 16 (an infrared sensor in this example) on the lower surface side for detecting the hand extended by the operator directly below the mixing nozzle 11 provided at the discharge port. Further, as a means for notifying that the handwashing procedure is being executed, the washing bowl 18 is provided with lighting 17 (LEDs in this example) that lights up from the start of handwashing until the door 2 is opened, on the upper surface of the recess of the washbasin bowl 18. The cleaning liquid tank 19 may be installed anywhere, but in this example, it is hidden and stored directly below the washbasin bowl 18.

[0019] The control unit 3 of this example is configured using a dedicated control device or a general-purpose computer and is installed on the wall surface above the washbasin bowl 18. The control unit 3 is electrically connected to the first on-off valve 121 via the first on-off valve signal line 31, to the three-way valve 15 via the three-way valve signal line 32, to the sensor 16 via the sensor signal line 33, to the lighting 17 via the lighting signal line 34, and to the driving means 21 of the door 2 via the driving means signal line 35, and control signals are transmitted and received respectively. The first on-off valve signal line 31, the three-way valve signal line 32, the sensor signal line 33, the lighting signal line 34, and the driving means signal line 35 may be either wired or wireless.

[0020] The operating procedure (first procedure to sixth procedure) of the handwashing interlocking door opening and closing system of this example will be described. While the handwashing device 1 closes the water constantly supplied from the water supply pipe with the first on-off valve 121, no water or cleaning foam is discharged from the mixing nozzle 11 (see FIG. 2). When the first on-off valve 121 is opened, water is supplied to the mixing nozzle 11 and water is discharged, or the mixing nozzle 11, which is an ejector, sucks the cleaning liquid and air and discharges the cleaning foam. The handwashing interlocking door opening and closing system of this example opens the door 2 only for the operator who performs handwashing according to a handwashing procedure in which patterns of not discharging, discharging only water, and discharging cleaning foam are determined in advance.

[0021] When no water or washing foam is being discharged, and an operator places their hand directly beneath the mixing nozzle 11, the sensor 16 detects the hand, as shown in Figure 3, and a series of hand-washing procedures begin (first step). The control unit 3, having received the detection signal from the sensor 16, sends a light-up signal (control signal) to turn on the light 17, sends an open signal (control signal) to open the first on-off valve 121, and simultaneously sends a switching signal (control signal) to the three-way valve 15 to switch to the flow path connecting the second inlet 152 and the outlet 153. The switching of the three-way valve 15 in the first step corresponds to closing the second on-off valve and opening the third on-off valve.

[0022] The control unit 3 ignores any further detection signals from the sensor 16 until the series of handwashing is completed and the door 2 is opened. This eliminates the risk of the handwashing series being reset midway, and after the door 2 is opened, the control unit 3 receives a detection signal from the sensor 16, allowing the next worker to begin washing their hands and thus enabling the series of handwashing to start. When water is supplied through the water supply passage 12, the mixing nozzle 11, while water is supplied from the branch supply passage 14 through the cleaning solution supply passage 13, exerts suction force as an ejector, drawing in air from the air intake port 111 and discharging water containing air bubbles.

[0023] Once the water discharge in the first step has been performed for the set time, as shown in Figure 4, the discharge switches from water only to the discharge of cleaning foam (second step). The first on-off valve 121 remains open as long as the control unit 3 continues to send an open signal (control signal), or as long as the control unit does not send a close signal (control signal), and continues to supply water to the mixing nozzle 11. Here, unlike the first step, the control unit 3 sends a switching signal (control signal) to the three-way valve 15, switching to the flow path connecting the first inlet 151 and the outlet 153. The switching of the three-way valve 15 in the second step corresponds to opening the second on-off valve and closing the third on-off valve. The mixing nozzle 11 is supplied with water through the water supply passage 12, cleaning liquid through the cleaning liquid supply passage 13, and air drawn in from the air intake port 111, and discharges cleaning foam.

[0024] Once the discharge of cleaning foam in the second step has been performed for the set time, as shown in Figure 5, the discharge of cleaning foam stops and the washing of any remaining cleaning fluid in the cleaning fluid supply passage 13 begins (third step). The first on-off valve 121 remains open as long as the control unit 3 continues to send an open signal, or unless the control unit sends a closed signal, and continues to supply water to the mixing nozzle 11. The control unit 3 sends a switching signal (control signal) to the three-way valve 15, switching back to the flow path connecting the second inlet 151 and the outlet 153. The switching of the three-way valve 15 in the third step corresponds to closing the second on-off valve and opening the third on-off valve. The mixing nozzle 11 is supplied with water through the water supply passage 12, water supplied from the branch supply passage 14 through the cleaning fluid supply passage 13, and air is drawn in from the air intake port 111, and it discharges water containing air bubbles.

[0025] Here, the water drawn from the branch supply passage 14 through the cleaning fluid supply passage 13 to the mixing nozzle 11 is supplied to the mixing nozzle 11 through the cleaning fluid supply passage 13 in the second step, washing away any cleaning fluid remaining in the cleaning fluid supply passage 13. For this reason, immediately after the start of the third step, the mixing nozzle 11 is supplied with (pushed over) the water, air is drawn in, and cleaning foam is temporarily discharged. However, once the water supplied from the branch supply passage 14 through the cleaning fluid supply passage 13 to the mixing nozzle 11 has finished washing away the cleaning fluid remaining in the cleaning fluid supply passage 13, the mixing nozzle 11 discharges only water containing air bubbles, similar to the first step. The main purpose of the third step is to wash away the cleaning fluid remaining in the cleaning fluid supply passage 13, so the execution time can be very short. The cleaning fluid being washed away is the cleaning fluid remaining in the cleaning fluid supply passage 13 from inside the three-way valve 15 to the mixing nozzle 11.

[0026] Once the water discharge in the third step has been performed for the set time, the discharge of water or cleaning foam is temporarily stopped, as shown in Figure 6 (fourth step). The control unit 3 sends a closing signal to the first on-off valve 121 and a switching signal (control signal) to the three-way valve 15, switching to the flow path connecting the first inlet 151 and the outlet 153. The switching of the three-way valve 15 in the fourth step corresponds to closing the second on-off valve and opening the third on-off valve. As a result, the water supply path 12 is blocked by the first on-off valve 121, the cleaning fluid supply path 13 is blocked by the three-way valve 15, and the supply of water through the branch supply path 14 is also stopped, so the discharge of water or cleaning foam is stopped.

[0027] If the execution time of the third step, which follows the second step of dispensing washing foam, is very short, then the washing foam dispensed in the second step will hardly be washed away and will remain on the hands. For this reason, in the hand-washing linked door opening and closing system of this example, the fourth step is performed, in which the dispensing of water or washing foam is stopped, to allow time for hand washing to distribute the washing foam to all parts of the hands. At this time, in order to prevent the worker from mistakenly assuming that the series of hand washings is complete just because the dispensing of water or washing foam has stopped, the lighting 17 that was turned on in the first step is kept on without being turned off.

[0028] After the set time has elapsed since the water or cleaning foam stopped in the fourth step, as shown in Figure 7, only water is discharged, similar to the first step (fifth step). The control unit 3 sends an open signal (control signal) to open the first on-off valve 121 and also sends a switching signal (control signal) to the three-way valve 15 to switch to the flow path connecting the second inlet 152 and the outlet 153. The switching of the three-way valve 15 in the fifth step corresponds to closing the second on-off valve and opening the third on-off valve. When water is supplied to the mixing nozzle 11 through the water supply path 12, water is supplied from the branch supply path 14 through the cleaning liquid supply path 13, and the nozzle acts as an ejector, exerting suction force to draw in air from the air intake port 111 and discharge water containing air bubbles. The worker then removes the remaining cleaning foam from their hands to complete the handwashing process.

[0029] When the water discharge in step 5 has elapsed for the set time, as shown in Figure 8, the door 2 is opened, indicating that handwashing according to the predetermined procedure is complete (step 6). The control unit 3 sends a closing signal to the first on-off valve 121 and a switching signal (control signal) to the three-way valve 15, switching to the flow path connecting the first inlet 151 and the outlet 153. The switching of the three-way valve 15 in step 4 corresponds to closing the second on-off valve and opening the third on-off valve. The control unit 3 then sends an activation signal (control signal) to the door 2 drive means 21 and turns off the light 17. Turning off the light 17 serves as a notification means to inform the worker that the series of handwashing steps has been completed, in addition to stopping the discharge of water or washing foam and opening the door 2.

[0030] The handwashing door interlocking system in this example is configured in which one handwashing device 1 is assigned to one door 2. Here, since the handwashing device 1 of the present invention has a means for preventing the solidification of the washing liquid, maintenance of the washing liquid supply path is generally unnecessary, and the frequency of replacement of the washing liquid supply path can also be reduced, so it is possible to configure a handwashing door interlocking system with multiple handwashing devices 1 installed. For example, if there are multiple doors 2, the same number of handwashing devices 1 as doors 2 are prepared and a specific door 2 is associated with a specific handwashing device 1. Also, if there are multiple handwashing devices 1, the control unit 3 of the multiple handwashing devices 1 is shared, and the control unit 3 adjusts which handwashing device 1 is performing the opening and closing of the door 2.

[0031] The handwashing device 1 used in the handwashing-linked door opening and closing system of this example miniaturizes the faucet body 112 by incorporating a three-way valve 15 that serves as both the second and third on-off valves. However, as can be seen from the illustrated handwashing procedure, where the flow path connecting the first inlet 151 and outlet 153 of the three-way valve 15, which corresponds to the second on-off valve, and the flow path connecting the second inlet 152 and outlet 153 of the three-way valve 15, which corresponds to the third on-off valve, are switched, the handwashing device 1 of the present invention can also be configured using a second on-off valve and a third on-off valve that are opened and closed alternately.

[0032] Another example of a hand-washing device 1, as seen in Figure 9, is the same as the present example (see Figure 2) in that it has a first on-off valve 121, which is a solenoid valve, in the water supply passage 12. However, it differs in that it has a second on-off valve 131, which is a solenoid valve, in the washing liquid supply passage 13, and a third on-off valve 141 in the branch supply passage 14 that connects the downstream of the first on-off valve 121 in the water supply passage 12 and the downstream of the second on-off valve 131 in the washing liquid supply passage 13. The control unit 3 is electrically connected to the second on-off valve 131 by the signal line 321 for the second on-off valve, and to the third on-off valve 141 by the signal line 322 for the third on-off valve, so that the second on-off valve 131 and the third on-off valve 141 can be independently opened and closed.

[0033] Another example of a handwashing device 1 operates as follows in a handwashing-linked door opening and closing system. The first step is to open the first on-off valve 121 and close the second on-off valve 131 and the third on-off valve 141, so that only water is discharged from the mixing nozzle 11. In the first step, the third on-off valve 141 may be open. The second step is to open the first on-off valve 121 and the second on-off valve 131 and close the third on-off valve 141, so that washing foam is discharged from the mixing nozzle 11. In the second step, the second on-off valve 131 opens and the third on-off valve 141 closes, so the two open and close alternately.

[0034] The third step involves opening the first on-off valve 121 and the third on-off valve 141, and closing the second on-off valve 131 to flush out any remaining cleaning fluid in the cleaning fluid supply passage 13. The cleaning fluid that is flushed out is the cleaning fluid remaining in the cleaning fluid supply passage 13 from the point where the branch supply passage 14 is connected to the mixing nozzle 11. In the third step, the second on-off valve 131 is closed and the third on-off valve 141 is opened, so the two open and close alternately. The fourth step involves closing all three on-off valves, the first on-off valve 121, the second on-off valve 131, and the third on-off valve 141, to stop the discharge from the mixing nozzle 11. In the fourth step, the third on-off valve 141 may remain open.

[0035] In step 5, as in step 1, the first on-off valve 121 is opened, and the second on-off valve 131 and the third on-off valve 141 are closed, so that only water is discharged from the mixing nozzle 11. In step 5, the third on-off valve 141 may be left open. In step 6, the first on-off valve 121, the second on-off valve 131, and the third on-off valve 141 are all closed, stopping the discharge from the mixing nozzle 11. In step 6, the third on-off valve 141 may be left open.

[0036] In the second and third steps, which are the objectives of the present invention, involving the rinsing of residual cleaning fluid in the cleaning fluid supply passage, the second on-off valve 131 and the third on-off valve 141 are opened and closed alternately. In the first step and steps 4 through 6, the third on-off valve 141 may be open or closed. Therefore, in another example of a hand-washing device 1 used in a hand-washing interlocking door opening and closing system, the second on-off valve 131 and the third on-off valve 141 may be opened and closed alternately from the first to the sixth step. The second on-off valve 131 and the third on-off valve 141, which are opened and closed alternately, perform the same function as the three-way valve 15. Therefore, in this example of a hand-washing device 1 (see Figure 2), in consideration of simplifying and miniaturizing the device configuration, the three-way valve 15 is used instead of the second on-off valve 131 and the third on-off valve 141. [Explanation of Symbols]

[0037] 1. Handwashing device 11 Mixing nozzle 111 Air intake 112 Flush Toilet Unit 12 Water supply channel 121 First Opening / Closing Valve 13. Cleaning fluid supply path 131 Second Opening / Closing Valve 14 Branch supply lines 141 Third Opening / Closing Valve 15 Three-way valve 151 1st inlet 152 2nd inlet 153 Outlet 16 sensors 17. Lighting (LED) 18 Washbasin 19 Cleaning solution tank 2 doors 21 Driving means 3. Control Unit 31 Signal wire for the first on / off valve 32 Signal wire for three-way valve 321 Signal wire for the second on / off valve 322 Signal wire for the third on / off valve 33 Sensor signal lines 34 Lighting signal wires 35 Signal line for drive means

Claims

1. In a handwashing device equipped with a mixing nozzle that supplies water as a driving fluid, draws in and mixes a cleaning solution and air as suction fluids, and discharges foam, The mixing nozzle has an air intake, A first on / off valve is provided in the water supply path that supplies water to the mixing nozzle. A second on / off valve is provided in the cleaning fluid supply path that supplies cleaning fluid to the mixing nozzle. The system is configured with a third on-off valve installed in a branch supply channel connecting the downstream of the first on-off valve in the water supply channel and the downstream of the second on-off valve in the cleaning fluid supply channel. It comprises a control unit that opens and closes the first, second, and third on-off valves. The control unit opens the first and second on-off valves and closes the third on-off valve to supply water from the water supply passage to the mixing nozzle, draws cleaning liquid from the cleaning liquid supply passage and air from the air intake to the mixing nozzle, and discharges cleaning foam from the mixing nozzle. Then, the control unit closes the second on-off valve and opens the first and third on-off valves to supply water from the water supply passage to the mixing nozzle, supplies water from the cleaning liquid supply passage to the mixing nozzle via the branch supply passage, draws air from the air intake to the mixing nozzle, flushes out any remaining cleaning liquid in the cleaning liquid supply passage, and discharges water from the mixing nozzle. A hand-washing device characterized by the following features.

2. The second and third shut-off valves are composed of three-way valves. The path connecting the first inlet and outlet of the three-way valve is designated as the second on-off valve, and the path connecting the second inlet and outlet of the three-way valve is designated as the third on-off valve. The first input port is connected to the upstream side of the cleaning fluid supply path. Connect the second input port to the branch supply path. The hand-washing device according to claim 1, wherein the outlet is connected to the downstream side of the washing liquid supply passage.

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