JPH0744535U - Sensor type automatic faucet - Google Patents

Abstract

(57) [Abstract] [Purpose] The sensor type automatic faucet that controls the solenoid valve by the signal from the sensor to automatically control the water supply. The aim is to realize resource savings. [Structure] An electromagnetic valve for driving a valve element arranged between a water supply pipe and a water supply port is controlled by a signal from a sensor, and the sensor is composed of a light projecting unit and a light receiving unit for receiving reflected light. In the automatic water faucet, a transparent member 14 that separates the light projecting portion and the light receiving portion from the outside is provided, and a step is formed between the light projecting portion side 141 and the light receiving portion side 142 on the outer surface of the transparent member 14. The structure with 15 attached.

Description

[Detailed description of the device] [Industrial applications]

 For example, in a washroom at a hotel or the like, a sensor detects when a hand is put out below the water supply port of the washbasin and activates the solenoid valve to automatically start water supply, and when the hand is no longer detected, the solenoid valve is activated. Sensor-type automatic faucets that return water to shut off water have become popular. The present invention relates to a sensor-type automatic faucet that controls a solenoid valve by a signal from a sensor in this way to automatically control water supply.

[Prior art]

 FIG. 3 is a cross-sectional view of a conventional sensor type automatic faucet. When the water supply pipe 1 is connected to a water pipe and a hand is inserted below the water supply port 2, water automatically comes out. That is, when the sensor S detects that a hand has come under the water supply port 2, the solenoid valve 3 is actuated by the detection signal, the pilot valve body 4 is opened, and the diaphragm back chamber 5 is opened by the pores 6. , 7 to communicate with the outlet pipe 8, the pressure in the diaphragm back chamber 5 decreases, and the diaphragm valve body 9 is pushed up by the water pressure on the water supply pipe 1 side, and the main valve opens. As a result, the water flowing in from the water supply pipe 1 is discharged from the water supply port 2 via the outlet pipe 8. When the hand is retracted from under the water supply port 2, the solenoid valve 3 is actuated by the signal from the sensor S and the pilot valve body 4 closes the fine hole 7, so that the water flowing in from the bleed hole 10 causes the water flowing into the diaphragm back chamber 5 to flow. And the diaphragm valve body 9 is pushed down, the main valve is closed, and water supply is stopped. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, and the light emitted from the light projecting unit 11 is reflected by the object, such as a hand, if it exists below the water supply port 2, and the light is received. The light is incident on the portion 12, the detection signal is emitted from the light receiving portion 12, and the solenoid valve 3 in FIG. 3 operates. When there is no object such as a hand under the water supply port 2, the light receiving unit 12 does not receive the reflected light, so the solenoid valve 3 closes the pilot valve body 4 and closes the main valve body.

[Problems to be solved by the device]

 A transparent plate 13 is provided between the sensor unit such as the light emitting unit 11 and the light receiving unit 12 and the outside to prevent water droplets from entering the inside. However, even if you do not extend your hand below the water supply port 2, there is a problem that water remains out of the water supply port 2 and valuable water resources are wasted. When the inventor of the present invention investigated the cause of the malfunction, it was found that water droplets or the like that bounced off when washing the hands adhered to the transparent plate 13 and the water droplet W acted as a prism. . There are various forms of attachment of water droplets, but when a large water droplet W is attached between the light projecting portion 11 side and the light receiving portion 12 side as shown in FIG. 4B, it is emitted from the light projecting portion 11. The reflected infrared ray is reflected by the water droplet W and reaches the light receiving unit 12 through the paths of L1, L2, and L3, and causes the malfunction as if there is a hand. In addition, as shown in FIG. 4C, even when the water droplet W1 is attached to the lower side of the light projecting portion 11 and the water droplet W2 is attached to the lower side of the light receiving portion 12, infrared rays are reflected by both water droplets W1 and W2. Then, the light reaches the light receiving unit 12 through the paths L1, L2, and L3 and receives the light. The technical problem of the present invention is to pay attention to such a problem, to solve the problem that the water drop adheres and the sensor erroneously detects, and to save water resources.

[Means for Solving the Problems]

 According to a first aspect of the present invention, as shown in FIG. 3, an electromagnetic valve that drives a valve body disposed between the water supply pipe and the water supply port is controlled by a signal from a sensor, and the sensor controls the light projecting portion and the reflected light. In a sensor type automatic faucet composed of a light receiving section for receiving light, a transparent member 14 for partitioning the light projecting section 11 and the light receiving section 12 side from the outside is provided as shown in FIG. 1, and the outer surface of the transparent member 14 is A step 15 is provided between the light emitting portion side 141 and the light receiving portion side 142.

[Action]

 As shown in FIG. 1, since there is a step 15 between the light projecting portion side 141 and the light receiving portion side 142, and the light receiving portion side 142 projects downward as shown in FIGS. As shown in FIG. 1 (1), even if the water droplet W adheres to the light projecting portion side 141, the infrared ray incident on the water droplet W is reflected to the outside by the route of L1 and L2. Is not incident on. Further, as shown in FIG. 1 (2), even if it is reflected twice in the water droplet W, it is reflected to the light projecting unit 11 side through the paths of L1, L2, and L3, so that it is incident on the light receiving unit 12 side. Therefore, it does not cause malfunction. Further, as shown in FIG. 1 (3), when the water droplet W adheres to the light receiving portion side 142, the light emitted from the light projecting portion 11 travels straight, and therefore cannot enter the water droplet W 2. No malfunction occurs. Even when the light projecting portion side 141 is projected downward as shown in FIGS. 1 (4) to (6), when the water droplet W is attached to the light receiving portion side 142 as shown in (4), Since the light emitted from the light projecting unit 11 travels straight, there is no fear of malfunction. Further, when the water droplet W is attached to the projecting portion side 141 which projects as in (5), it is reflected to the outside like L2 or reflected to the projecting portion 11 side like L3. Therefore, there is no possibility of reaching the light receiving section 12 and causing a malfunction. As shown in (6), even when the water droplet W1 is attached to the light emitting portion side 141 and the water droplet W2 is attached to the light receiving portion side 142, the water droplet W1 attached to the protruding light emitting portion side 141 is Since it is reflected to the outside like L2 or reflected to the light projecting unit 11 side like L3, there is no component reaching the light receiving unit 12. As described above, when the step 15 is formed, there are two cases, that is, the light projecting portion side 141 is convex, and conversely, the light receiving portion side 142 is convex, but the former is more effective. As described above, since there is the step 15 between the light projecting portion side 141 and the light receiving portion side 142, even if the water droplet W adheres to the light projecting portion side 141 or the light receiving portion side 142, the reflection by the water droplet W occurs. The light does not reach the light receiving portion 12, and the larger the step 15 is, the more reliably the malfunction can be prevented.

【Example】

 Next, practical examples of how the sensor-type automatic faucet according to the present invention is embodied will be described. FIG. 2 shows an embodiment of the sensor type automatic faucet according to the present invention. (1) is a sectional view of the vicinity of the sensor in the sensor type automatic faucet, (2) is a perspective view of the transparent member 14 with a step, (3) ) Is a sectional view taken along line AA in FIG. As shown in FIG. 2 (2), the transparent member 14 of the present invention has a step 15 on the outer side surface of the sensor type automatic faucet. In the embodiment of FIG. 2, the light projecting portion 11 side is retracted. And the light receiving portion side 142 projects. When this transparent member 14 is inserted as a partition member between the sensor S and the outside as shown in FIG. 2 (1), a structure as shown in FIG. 2 (3) is obtained, which will be described with reference to FIGS. 1 (1) to (3). For that reason, there is no possibility that the light receiving unit 12 may erroneously detect. On the contrary, due to the reason described in FIGS. 1 (4) to 1 (6), the problem of erroneous detection is solved even when the transparent member 14 having the light projecting portion side 141 protruding is mounted. In the illustrated embodiment, the plate thickness of the transparent member is changed depending on the step, and the larger the step is, the easier it is to prevent malfunction, but normally, about twice the thin one is effective. Further, the steps in which the light receiving portion side 142 is convex as in (1) to (3) can be more reliably prevented from being erroneously detected than the steps in which the light receiving portion side 141 is convex as in (4) to (6). .

[Effect of device]

 As described above, according to the present invention, the light reflected by water droplets can be generated by simply forming a step between the light emitting portion side 141 and the light receiving portion side 142 on the outer surface of the transparent member 14 that partitions the sensor side from the outside. It is possible to prevent the sensor from reaching the light receiving part 12 side, and prevent malfunctions due to the reflected light of water droplets. It is possible to effectively prevent water from leaving due to malfunctions of the sensor type automatic faucet. And it can be prevented at low cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration and an operation explanation of a sensor type automatic faucet according to the present invention.

FIG. 2 is a view showing an embodiment of a sensor type automatic faucet according to the present invention.

FIG. 3 is a cross-sectional view showing the whole of a conventional sensor type automatic faucet.

4 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Water Supply Pipe 2 Water Supply Port S Sensor 3 Solenoid Valve 9 Diaphragm Valve Body 11 Light Emitting Part 12 Light Receiving Part 13 Transparent Plate 14 Transparent Member 141 Light Emitting Part Side 142 Light Receiving Part Side 15 Step W, W1, W2 Water Droplet

Claims (1)

[Scope of utility model registration request] 1. A solenoid valve for driving a valve element disposed between a water supply pipe and a water supply port is controlled by a signal from a sensor, and the sensor is provided with a light emitting unit and a light receiving unit for receiving reflected light. In the sensor-type automatic faucet, the transparent member (1
4) is provided, and on the outer surface of the transparent member (14),
A sensor type automatic water faucet characterized in that a step (15) is provided between the light projecting portion side (141) and the light receiving portion side (142).