JPS63181934A - Automatic water feeder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an automatic water supply device that can supply water to an object to be watered (such as soil in which plants are planted) without relying on human labor.

[Background technology]

These days, many households keep ornamental flowerpots indoors or on their balconies, but sometimes the flowers wither due to family members being absent or forgetting to water them, so watering cannot be done automatically. A device that can do this is desired.

On the other hand, some types of soil, such as those in flowerpots, have good drainage and some have poor drainage, and their water retention properties differ, so it is desirable to have a device that supplies an appropriate amount of water depending on the moisture level of the soil.

For this reason, as a device for supplying an appropriate amount of water depending on the moisture level of the soil, for example,
As shown in Japanese Patent No. 0, a system has been proposed in which water is supplied by detecting the wetness of soil using a humidity sensor.

However, since the above device is an automatic water supply device for outdoor use and uses tap water as a water supply source, it is necessary to pull the hose to use it indoors or on a balcony or other place away from the water faucet. It was not suitable for supplying water to flower pots on balconies or on balconies.

Therefore, a pump is attached to a tank, a humidity sensor and a water supply nozzle connected to the pump are inserted into the soil of a flowerpot, the humidity level of the soil is detected by the humidity sensor, and the humidity level of the soil is detected by the signal from the humidity sensor. An automatic water supply device has been developed which operates a pump to supply water from the water supply nozzle to the soil of a flower pot. However, the conventional automatic water supply device has the following problems.

In other words, the position (distance) relationship between the water supply nozzle and the humidity sensor is important for determining the amount of water to be supplied to the object to be watered, and is determined by the object to be watered. The user had to insert the water supply nozzle and humidity sensor into an appropriate place in the soil in the flower pot, so the positional relationship between the water supply nozzle and the humidity sensor varied depending on the user. If they were placed too close together, the water supply would immediately stop, causing a water shortage, or if they were placed too far apart, the humidity sensor would not work properly, causing problems such as over-watering. In particular, when used in soil planted with cacti or winter ornamental plants, the roots of such plants rot if they are watered too much, causing problems such as spoiling the plants.

[Purpose of the invention]

In view of the above circumstances, it is an object of the present invention to provide an automatic water supply device that can supply an appropriate amount of water depending on the object to be watered, even if the user is different. [Disclosure of the Invention] Achieving the above object. Therefore, the present invention provides a water supply nozzle that serves as a water supply port for supplying water to an object to be watered, a pump that takes water from a tank and supplies water to the water supply nozzle, a motor that operates this pump, and the object to be watered. An automatic water supply device comprising: a water sensor for detecting the amount of water in at least one of the water supply nozzles; and a control means for operating and stopping the motor by obtaining a signal from the water sensor; The gist of the present invention is an automatic water supply device characterized by being equipped with a holder that holds a water sensor integrally with the water sensor so that the distance between the two can be selected depending on the object to be watered.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a first embodiment of an automatic water supply device according to the present invention. As shown in the figure, this automatic water supply device 1 includes a water supply nozzle 14, a pump 2, a motor 3, a water sensor 4, a control means 5, and a holder 50. Furthermore, this embodiment also includes a tank 6 and a water level sensor 7.

The pump 2 takes water from a tank and supplies water from a water supply nozzle 14 to objects to be watered, such as soil 9 in a plurality of flowerpots 8. Therefore, the water supply nozzle 14 serves as a water supply port for supplying water to the object to be watered. The motor 3 is driven under the control of the control means 5 and causes the pump 2 to work. As the water sensor 4, in this embodiment, a humidity sensor is used, which is inserted into one of the soils 9 of the plurality of flower pots 8, and the moisture content of the soil 9 (in this case,
humidity). The control means 5 operates the motor 3 by obtaining a signal from the water sensor 4.
It is designed to be activated (activated) or deactivated.

A DC power source such as a battery is used as the power source 11 of the control means 5, but other sources may be used. 12 is a power switch 7, and 19 is a hose that serves as a water supply channel.

As shown in FIG. 2, the holder 50 is made up of four straight plates 51 combined into a rectangular frame shape. The plate bodies 51 are fixed to each other by bolts 52 (or bolts and bolts). Each plate 5I is formed with a water supply nozzle 14 (among the plurality of water supply nozzles, the water supply nozzle for supplying water to the soil 9 into which the water sensor 4 is inserted) and holes A-L into which the water sensor 4 is inserted. There is. The water supply nozzle 14 and the water sensor 4 are inserted into one of the holes A to L, respectively, so that the holder 5
It is held integrally at 0. In use, as shown in FIG.
The soil 9 may be placed on the soil 9, the holes A to L may be selected as appropriate, the water supply nozzle 14 and the water sensor 4 may be inserted into the selected holes, and the water supply nozzle 14 and the water sensor 4 may be inserted into the soil 9. Select a hole to insert the water supply nozzle 14 and water sensor 4, and insert the water supply nozzle 14 and water sensor 4 into the selected hole.
For example, if the water sensor 4 is inserted into the hole A and the water supply nozzle 14 is inserted into the hole B, the distance m between the water supply nozzle 14 and the water sensor 4 (shown in FIG. 3) is the same as that between the holes A and B. The distance between them is m, (shown in Figure 2). Also, when the water sensor 4 is inserted into hole A and the water supply nozzle 14 is inserted into hole I,
The distance m between the water supply nozzle 14 and the water sensor 4 is between hole A and hole I.
and the distance mz (shown in FIG. 2). The holes into which the water supply nozzle 14 and the water sensor 4 are inserted are selected depending on the object to be watered. In this way, this automatic water supply device 1 is configured to appropriately select the holes A-L depending on the object to be watered and insert the water supply nozzle 14 and the water sensor 4 into the selected hole. Distance m between and water sensor 4
can be changed as appropriate depending on the object to be watered. Therefore, even if the users are different, the distance between the water supply nozzle 14 and the water sensor 4 can always be set at a distance corresponding to the object to be watered.

When the distance m between the water supply nozzle 14 and the water sensor 4 is large, compared to when it is small, the distance from the time when water starts being supplied from the water supply nozzle 14 until the amount of moisture in the soil near the water sensor 4 becomes larger than the set value of the water sensor 4 It takes time. Therefore, the detection time of the water sensor 4 is delayed, and a large amount of water is applied to the object to be watered. Conversely, if it is small, less water will be given to the object to be watered. Therefore, in the above example,
Since m2>m, when the water supply nozzle 14 is inserted into the hole I, more water can be applied to the object to be watered than when it is inserted into the hole B. In other words, there is a large amount of
If you want to give a small amount of moisture to the object to be watered, select the hole A-L into which the water supply nozzle 14 and the water sensor 4 are inserted so that the distance m between the water supply nozzle 14 and the water sensor 4 is large. If you want to give water, the water supply nozzle 14 is adjusted so that the distance m between the water supply nozzle I4 and the water sensor
Then, the hole A-L into which the water sensor 4 is inserted may be selected.

As described above, this automatic water supply device 1 has a water supply nozzle 14.
Since it is equipped with a holder 50 that holds the and water sensor 4 integrally and the interval between them can be selected depending on the object to be watered, even if the users are different, the water sensor 4 can be easily connected to the object to be watered. This allows for a suitable water supply.

In this embodiment, the pump 2, motor 3, control means 5, and power source 11 are housed in one body (main body) 13, and this body 13 also serves as a lid covering the upper opening of the tank 6. Therefore, it is difficult for dust, dirt, etc. to enter the tank 6, and clogging of the pump, hose, etc. can be prevented. If there is a fastener that fixes the tank 6 and the body 13 when they are integrated, it will be convenient to carry them when they are integrated.

Next, the operation of this automatic water supply device 1 will be explained. As shown in FIG. 1, when the power switch 12 is turned on, the water sensor 4 detects the moisture content of the soil 9 in the flowerpot 8, and if this is below a certain value, the control means 5 uses this signal to activate the motor. (Pump drive motor) 3 is operated to make pump 2 work. The pump 2 sucks up water lO from the tank 6, and discharges water from the water supply nozzle 14 through the hose 19, which is a water supply channel, to supply water to the soil 9. At this time, when the moisture content of the soil 9 exceeds a certain value, the water sensor 4 detects this, and the control means 5 stops the motor 3 and the pump 2 based on this signal. On the other hand, a water level sensor 7 is attached slightly above the lower end of the suction hose 15 of the pump 2.

When the water level in the tank 6 is decreasing, the water level sensor 7 detects the decrease in the water level before the water level becomes lower than the lower end of the suction hose 15, and this signal causes the control means 5 in the body 13 to start the motor. 3 to prevent dry running.

This can prevent unnecessary battery consumption and motor burnout.

Next, the operation of the control means 5 will be explained. FIG. 4 shows an example of an electric circuit constituting the control means 5. As shown in FIG. As shown in the figure, the control electric circuit 5a has the following configuration. A series circuit of a resistor (R,) 21 and a resistor (R2) 22 is connected between the power supply (E) 11 and the common line i, and the non-inverting input terminal of the IC 23 is connected between the resistors 21 and 22. There is. Resistors 21 and 22
creates a reference signal for setting the moisture content. A series circuit of a variable resistor (VRsA) 24 and a water sensor 4 is connected between the power supply 11 and the common line 2, and an inverting input terminal of the IC 23 is connected between the variable resistor 24 and the water sensor 4. . Connect a resistor (RE) between the line #11 and the common line E.
25, the emitter and collector of a transistor (Q2) 26, and a series circuit of a resistor (Rg) 27 are connected. The output terminal of IC23 is transistor 26
is connected to the base of A resistor (Ro) 28 and a diode (DH) 29 are connected between the non-inverting input terminal and the output terminal of the IC 23, as shown in the figure. Between the power supply II and the common line I, a motor 3, a transistor (
A series circuit of the collector and emitter of Q, ) 30 is connected, and the base of transistor 30 is connected to transistor 2.
It is connected to 6 collectors. In parallel with the motor 3, a resistor (RL) 31 and a light emitting diode (LED)
32 series circuits are connected. A series circuit of resistors (R3) 33 and (R,) 34 is connected between the power supply 11 and the common line l, and a resistor (Rs++)
35 and a series circuit of the water level sensor 7 are connected.

The resistor 33 and the resistor 34 provide a reference signal for setting the water level.The inverting input terminal of the IC36 is connected between the resistor 35 and the water level sensor 7, respectively.The output terminal of the IC36 is connected to the inverting input terminal of the IC23. The parts i, ii, and the parts separated by the dashed line of the electric circuit 5a are connected.
iii and iv are display circuit i, motor control circuit ii, water adjustment circuit iii, and water level comparison circuit iv, respectively.
It's raining. Reference numeral 12 denotes a power switch that turns the power on and off.

When the power switch 12 is turned on, the power supply 11 supplies power to the electric circuit 5a. IC23 and IC36 are comparators each having an open collector type output terminal. The voltage ■1 is applied to the non-inverting input terminal of the IC 23 as a reference voltage by the resistors 21 and 22. Resistance 33.
34, the voltage ■2 is applied to the non-inverting input terminal of the IC 36 as a reference voltage. In this embodiment, the water level sensor 7 is a sensor whose resistance changes when water is detected.
When the voltage is below, the voltage at the inverting input terminal of IC36 becomes lower than the reference voltage ■2, and the output terminal of IC36 becomes a high level state, and since the output of this IC36 is an open collector, there is a gap between IC36 and IC23. The connection will be severed. The water sensor 4 used has a resistance that increases when the humidity of the object to be watered is low, and this resistance value increases, that is, the voltage at the inverting input terminal of the IC 23 becomes the voltage at the non-inverting input terminal.

When the voltage is higher than R, +R2, the output terminal of IC 23 becomes low level, base current flows from resistor 25 to the emitter of transistor 26, transistor 26 becomes conductive, and transistor 30 becomes conductive. This causes current to flow through the motor 3, which operates the motor 3 to operate the pump. A series circuit of a resistor 28 and a diode 29 is connected to an IC (
This is a circuit for providing hysteresis characteristics to the comparator (comparator) 23. When the output terminal of IC23 becomes low level, the voltage V,' at the non-inverting input terminal of IC23 changes to become v,>v,'. . Therefore, chattering phenomenon immediately after the motor 3 starts operating is prevented. When the water sensor 4 detects a certain amount of water, the voltage at the inverting input terminal of the IC 23 becomes lower than the voltage Vl' at the non-inverting input terminal, and the output terminal of the IC 23 returns to high level to stop the motor 3. When the water content of the water supply target decreases, by repeating this action, the water content of the water supply target, such as the soil in a flowerpot, is automatically maintained constant within a certain range, and this can prevent plants from dying. There is no.

A series circuit i composed of a resistor 31 and a light emitting diode 32 is a display circuit, and when the motor 3 is operated, the light emitting diode 32 lights up to provide an indication. Variable resistance (volume)
24 adjusts the sensitivity of the water sensor 4. In this embodiment, when the resistance value of the variable resistor 24 is increased, the sensitivity of the water sensor 4 decreases, and unless the resistance of the water sensor 4 becomes larger, that is, the water content of the object to be watered becomes lower, the motor 3 is not working. Conversely, when the resistance value of the variable resistor 24 is reduced, the sensitivity of the water sensor 4 increases, and the motor 3 operates even if the resistance of the water sensor 4 is smaller, that is, even if the water content of the water supply object is larger. It becomes like this. In this way, the water level at the start of water supply can be varied by the variable resistor. The resistance value of such a variable resistor may be set appropriately depending on, for example, the type of plants to be planted on the object to be watered, the type and nature of the object to be watered, and the like.

Note that when the water level in the tank 6 decreases due to water supply or evaporation, and the resistance value of the water level sensor 7 increases, the voltage at the inverting input terminal of the IC 36 becomes higher than the voltage (2) at the non-inverting input terminal. At this time, the output terminal of IC36 becomes low level (earth level), and the inverting input terminal of IC23 also becomes low level, so the output terminal of IC23 becomes high level, and when the water level is less than the predetermined amount, this The high level is maintained and the motor 3 does not move. Even if this happens while the motor 3 is running, the motor 3 will stop. This prevents the motor from running idle.

In the drawings shown below, parts corresponding to those shown in FIGS. 1 to 4 are given the same numbers and symbols.

FIG. 5 shows a holder 50 of the second embodiment. As shown in the figure, this holder 50 is different from the holder shown in the first embodiment in that it has an elongated hole 5 along the longitudinal direction in the portion of the straight plate 51 through which the port 52 is passed.
3 is formed, and by loosening the bolt 52, each plate body 51 can be slid with respect to the combined plate body. Therefore, the size of the holder 50 can be changed, so that even if the size of the flower pot or the plant planted therein changes, it can be accommodated.

FIG. 6 shows a holder 50 of the third embodiment. As shown in the figure, this holder 50 is the same as the holder shown in the first embodiment, but includes two pipes 54 as shown in FIG. 7, one for the water supply nozzle and one for the water sensor. As shown in FIG. 7, each tube 54 has an elongated bag shape, and has a large number of holes 55 formed in the tube wall to serve as a water circulation path, and a ring-shaped flange at the upper end. 56
is formed. As shown in FIG. 6, each of these pipes 54 is inserted into one of the holes A-L appropriately selected depending on the object to be watered and attached to the plate body 51. In FIG. 6, it is attached to holes B and H. For use,
As shown in FIG. 8, the holder 50 is placed on the soil 9 so that the plate 51 surrounds the plants planted in the flowerpot 8, and the holes A to A are connected depending on the object to be watered. , and insert the pipe 54 into the selected hole with the water supply nozzle 14 and water sensor 4 inserted, and insert the pipe 54 into which the water supply nozzle 14 and water sensor 4 have been inserted into the soil (water supply target) 9, respectively. After inserting it deeply, soil is put into the pipe so that the water supply nozzle 14 and the water sensor 4 are buried deeply in the soil 9. In this way, the water supply nozzle 14 and the water sensor 4 are buried deep in the soil 9 and the water supply nozzle 14 and the water sensor 4 are
By bringing the plant close to the roots, the water sensor 4 can accurately detect the amount of water near the roots that the plant requires, and the water supply nozzle 14 can supply the necessary amount of water near the roots. The tube 54 shown in FIG. 7 may be attached to the holder of the second embodiment.

FIG. 9 shows a holder 50 of the fourth embodiment. As shown in the figure, this holder 50 has an arc-shaped plate 5
7 and a straight plate 58. The arc-shaped plate 57 has a plurality of holes N-U formed into which the water supply nozzle 14 is inserted, and one of these holes N-U is appropriately selected depending on the object to be watered, and the hole is inserted into the selected hole. The water supply nozzle 14 is inserted and the water supply nozzle 14 is held. The water sensor 4 is mounted on the straight plate 58.
A hole M is formed into which the water sensor 4 is inserted, and the water sensor 4 is inserted into this hole M to hold the water sensor 4. These arc-shaped plates 57 and straight plates 58
means that the water sensor holding portion of the plate body 58 (
The parts in which the holes M are formed) are placed in the same position, and are fixed with bolts 52. An elongated hole 53 is formed along the longitudinal direction in the portion of the straight plate 58 through which the bolt 52 is passed, and by loosening the bolt 52, the plate 58 is radially aligned with respect to the plate 57. It can be slid in any direction.

In use, as shown in Figure 1O, the holder 50
is placed on the soil 9 so that the plate 57 surrounds the plant planted in the flower pot 8, and the hole M of the plate 58 is
Insert the water sensor 4 into the soil 9, select the hole N-U of the plate 57 appropriately according to the object to be watered, insert the water supply nozzle 14 into the selected hole, and connect the water supply nozzle 14 and the water sensor 4 to the soil 9. so that it is inserted into the The holder 50 is
According to the embodiment shown in FIG. The sensor 4 can detect the amount of water that is really needed, and can supply just the right amount of water. In this embodiment, in order to change the distance between the water sensor 4 and the water supply nozzle 14, the hole into which the water supply nozzle 14 is inserted is
or loosen the bolt 52 and slide the plate 58. In this embodiment, since the plate 58 slides in the radial direction with respect to the plate 57, even if the stem of the plant becomes large, it can be accommodated.

FIG. 11 shows a holder 50 of the fifth embodiment. As shown in the figure, this holder 50 is obtained by attaching the tube 54 of the third embodiment shown in FIG. 7 to the holder of the fourth embodiment. The tube 54 is connected to the hole M of the plate 58 and the plate 57.
is inserted into one of the holes N-U. The water sensor 4 is inserted into the pipe 54 inserted into the hole M of the plate body 58, and the water supply is inserted into the pipe 54 inserted into one of the holes N-U (hole N in the figure) of the plate body 57. Nozzle 14 is inserted.

In use, as shown in FIG.
is placed on the soil 9 so that the plate 57 surrounds the plant planted in the flower pot 8, and the hole M of the plate 58 is
Insert the pipe 54 with the water sensor inserted into the hole, select holes N-U of the plate 57 as appropriate depending on the object to be watered, and insert the pipe 54 into the selected hole with the water supply nozzle 14 inserted. After inserting the water supply nozzle 14 and the pipe 54 into which the water sensor 4 is inserted deeply into the soil (water supply target) 9, put soil into the pipe, and then insert the water supply nozzle 14 and the water sensor 4 into the soil. 9. Make sure to embed it deeply. If the fifth embodiment is adopted, the effects of the fourth embodiment and the third embodiment can be combined.

FIG. 13 shows the sixth embodiment.

As shown in the figure, in the first embodiment of the automatic water supply device 1, a thermostat 60 is attached to the surface of the motor 3 to detect an abnormal temperature rise of the motor. By doing this, if the water sensor 4 malfunctions or humidity detection is delayed, or if the motor 3 heats up and malfunctions due to water supply from multiple water supply nozzles,
It can be prevented.

FIG. 14 shows the seventh embodiment.

As shown in the figure, this automatic water supply device 1 has a water intake port of a pump 2 (in this embodiment, the tip of a suction hose 15).
A filter (in this embodiment, a net) 70 is attached to. Further, in this embodiment, the body 13 has an inverted U-shape (
The hook part 44 (which may be in an inverted shape, etc.) is formed, and as shown in FIG. It can be hung and used.

In this way, if it can be used by hooking it onto another bucket 43, etc., when the user is away for a long time and there is a need for automatic water supply without refilling the tank for a long period of time. For example, you can use a large-capacity tank, eliminating the worry of running out of water. Moreover, if the filter 7o is attached to the water supply port of the pump 2 as in this embodiment, it is possible to prevent the pump 2 from being clogged by dirt entering from the outside. When you do, you can get great results.

The automatic water supply device according to the present invention is not limited to the above embodiment. For example, the water sensor that detects the amount of water in the water supply target may be a moisture sensor, a sensor with a pair of electrodes, a water level sensor, or the like in addition to a humidity sensor. If there is only one object to be watered, install a water sensor on it,
Just supply water to it. If there are multiple objects to be watered,
Although a water sensor is installed at only one of them and water is supplied to other objects based on that, water sensors may be installed at two or more objects to be watered. Although a variable resistor is used to adjust the sensitivity of the water sensor, the sensitivity may be adjusted by combining fixed resistors, or may be made variable using another element circuit. Detection of the water content of the object to be watered and detection of the water level of the tank may be performed using methods other than changes in resistance value. There are various objects to be watered, such as soil and cultivation mats.

〔Effect of the invention〕

As described above, the automatic water supply device according to the present invention includes a water supply nozzle that serves as a water supply port for supplying water to an object to be watered, and a water supply nozzle that takes water from a tank and supplies water from the water supply nozzle to the object to be watered. A pump, a motor for operating the pump, a water sensor for detecting the amount of water in at least one of the objects to be watered, and a control means for operating and stopping the motor by obtaining a signal from the water sensor. The automatic water supply device is characterized by comprising a holder that holds the water supply nozzle and the water sensor integrally so that the interval between the two can be selected depending on the object to be watered. Therefore, even if the users are different, the appropriate amount of water can be supplied depending on the object to be watered. For example, for plants that require watering many times, by selecting a close distance between the water sensor and the water nozzle in the holder, it is possible to easily provide an appropriate amount of water depending on the object to be watered. In addition, if you want to change the amount of water supplied to the water supply object in summer or winter, you can easily adjust the amount of water to the water supply object by selecting the position of the water sensor and water supply nozzle in the holder and changing the distance between them. The amount of water supplied can be adjusted accordingly.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a first embodiment of an automatic water supply device according to the present invention, FIG. 2 is a perspective view of a holder of the first embodiment, and FIG. FIG. 4 is a circuit diagram showing an example of the electric circuit constituting the control means of the first embodiment;
Figure 5 is a perspective view of the holder of the second embodiment;
The figure is a perspective view of the holder of the third embodiment, FIG. 7 is a perspective view of the tube used in the holder of the third embodiment, and FIG. 8 is a perspective view of the holder of the third embodiment. FIG. 9 is a perspective view of the holder of the fourth embodiment; FIG. 10 is an explanatory diagram of the holder of the fourth embodiment; Fig. 11 is a perspective view of the holder of the fifth embodiment, Fig. 12 is an explanatory diagram showing the state of use of the holder of the fifth embodiment, and Fig. 13 is a schematic diagram of the sixth embodiment. Fig. 14 is a schematic perspective view of the seventh embodiment with a part cut away, and Fig. 15 shows the state in which the seventh embodiment is attached to a bucket and used. FIG. 1... Automatic water supply device 2... Pump 3... Motor 4... Water sensor 5... Control means 6... Tank 9... Soil (water supply target) 14... Water supply nozzle 50... Holder 51... Plate body that holds the water supply nozzle and water sensor 53... Long hole 54...
Pipe 55... Pipe hole 57... Arc-shaped plate 58.
... Straight plate body 60 ... Thermostat 70 ... Filter agent Patent attorney Takeshi Matsumoto
Hiko Figure 1 @ Figure 2 Figure 3 Interment Figure 5 Figure 6 @ Figure 7! Figure 9 Figure 11 Figure 12 Flash Figure 13 Figure 15

Claims (6)

[Claims] (1) A water supply nozzle serving as a water supply port for supplying water to the water supply target, a pump that takes water from a tank and supplies water to the water supply nozzle, a motor that operates this pump, and at least one of the water supply target. An automatic water supply device comprising a water sensor that detects a water content and a control means that operates and stops the motor by obtaining a signal from the water sensor, the water supply nozzle and the water sensor being connected to each other. An automatic water supply device characterized by comprising a holder that holds the two integrally so that the interval between the two can be selected depending on the object to be watered. (2) The holder is a combination of a plurality of plates for holding the water supply nozzle and the water sensor, and each of the plates is slidable relative to the combined plate. An automatic water supply device according to claim 1. (3) The holder includes a water supply nozzle and a pipe into which the water sensor is inserted, and each of these pipes has a number of holes in each wall, and the water supply target is inserted into the water supply nozzle and the water sensor. The automatic water supply device according to claim 1 or 2, which is configured to be inserted deeply into the water supply device. (4) The holder includes an arc-shaped plate that holds the water supply nozzle and a straight plate that holds the water sensor, and the water of the straight plate that extends within the arc of the arc-shaped plate. The automatic water supply device according to any one of claims 1 to 3, which is assembled so that the sensor holding portion is located. (5) The automatic water supply device according to any one of claims 1 to 4, comprising a thermostat that detects an abnormal temperature rise of the motor. (6) The automatic water supply device according to any one of claims 1 to 5, comprising a filter that covers the water intake port of the pump.