KR20210103635A - Water traps having a water detector - Google Patents

Abstract

The present invention relates to a water detector and, more specifically, to a water collection apparatus manufactured based on a water detector detecting a water flow from an FPCB-type water detection sensor when detecting a voltage applied to a solenoid valve. In accordance with the present invention, an FPCB-type water detection sensor made of a metal layer or a resin layer is used to reliably detect water passing through a flow path. Moreover, in accordance with the present invention, a shield part connected with an earth is formed around an input part of a substrate to minimize the inflow of outside noise into the input part. In accordance with the present invention, a thermal contraction tube is provided on the outer surface of a sensor part to prevent the water detection sensor from departing from the outer surface of the flow path. In accordance with the present invention, only when an on-state of a solenoid valve is detected through voltage measurement, the flow of water is detected through the water detection sensor and a reference capacitance value is corrected, and, as a result, the occurrence of an error can be prevented.

Description

Water collection device including water detector {WATER TRAPS HAVING A WATER DETECTOR}

The present invention relates to a water sensor, and more particularly, to a water sensor that detects a flow of water from an FPCB type water sensor when detecting a voltage applied to a solenoid valve, and also provides a water collection device using the water sensor.

A hydrogen vehicle is provided with a water collection device that stores and discharges water generated at the hydrogen electrode of the fuel cell stack, that is, condensate. Conventionally, a water sensor was installed in the water collection device to measure whether and how much condensed water was stored in the water collection device. However, in this case, condensed water stored in the water collecting device can be detected, but water discharged from the water collecting device cannot be detected, so there is a problem in that it is impossible to determine whether there is a malfunction.

Korean Utility Model Publication No. 20-2019-0000119 (published on January 15, 2019)

An object of the present invention is to provide a water sensor capable of effectively detecting the flow of water, and also to provide a water collection device using the water sensor.

The object of the present invention is not limited to the above-mentioned object, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

The water collection device according to the present invention includes a storage tank in which condensed water is stored and discharged to a discharge path, a solenoid valve for controlling the discharge of water to the discharge path, a housing having a flow path through which condensed water discharged to the discharge path flows, and the A water sensor surrounding the flow path and comprising a metal layer and a resin layer provided on one surface of the metal layer, when detecting a voltage applied when the solenoid valve is operated and a water sensor including a substrate provided with a control unit for sensing.

The controller includes a timer, a voltage measuring module that measures the voltage applied to the solenoid valve every predetermined time according to the timer, and when the voltage measured by the voltage measuring module is equal to or greater than a reference voltage, it is determined that the solenoid valve is in an on state a valve state determination module, and when the valve state determination module determines that the solenoid valve is in an on state, the capacitance value measured by the water detection sensor is compared with a reference capacitance value to detect water flowing in the flow path Includes a sensing module.

A temperature sensor for measuring a temperature and a heater for generating heat are provided on the substrate, and the controller operates the heater when the temperature measured by the temperature sensor is less than the reference minimum temperature, and the temperature sensor measures the temperature. It may further include a heater control module for stopping the heater when the temperature is higher than the reference maximum temperature.

When the valve state determination module determines that the solenoid valve is in the on state, the control unit may correct the reference capacitance value to the capacitance value immediately measured by the water detection sensor.

The water detection sensor includes a cylindrical sensor unit surrounding the flow path, and an output unit protruding and bent from the sensor unit to be connected to the substrate, and a cutout is formed at a contact point between the sensor unit and the output unit.

An input unit to which the output unit is connected is formed on the substrate to be connected to the control unit, and a shield unit spaced apart from the input unit and spaced apart from the input unit is formed at an edge of the input unit, wherein a plurality of through-holes connected to the ground are spaced apart from each other.

The water collection device including a water sensor according to the present invention can reliably detect water passing through a flow path by using an FPCB type water sensor including a metal layer and a resin layer.

In addition, the water collection device including the water sensor according to the present invention forms a shield connected to the ground around the input part of the substrate to minimize external noise from entering the input part.

The water collecting device including the water sensor according to the present invention may include a heat shrinkable tube on the outer surface of the sensor unit to prevent the water detecting sensor from being separated from the outer surface of the flow path.

The water collection device including the water sensor according to the present invention detects the flow of water with the water sensor only when detecting the ON state of the solenoid valve by measuring the voltage, and can prevent the error from occurring by correcting the reference capacitance value.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a schematic perspective view of a water sensor according to the present invention;
2 is a schematic cross-sectional view of a water sensor according to the present invention;
3 is a schematic perspective view of a water detection sensor according to the present invention;
4 is a schematic exploded perspective view of a water detection sensor according to the present invention.
5 is a schematic plan view of a substrate according to the present invention;
6 is a block diagram of a control unit according to the present invention.
7 is a schematic cross-sectional view of a water collection device equipped with a water sensor according to the present invention.
8 is a flowchart of a water sensing method according to the present invention.
9 is a PWM signal graph according to the water detection method according to the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a schematic perspective view of a water sensor according to the present invention, and FIG. 2 is a schematic cross-sectional view of a water sensor according to the present invention.

As shown in FIGS. 1 and 2 , the water sensor according to the present invention includes a water sensor 100 , a substrate 200 for detecting water based on a signal output from the water sensor 100 , and water and a housing 300 for accommodating and protecting the detection sensor 100 and the substrate 200 provided with the water detection sensor 100 .

3 is a schematic perspective view of a water detection sensor according to the present invention;

The water detection sensor 100 detects water based on a change in capacitance. To this end, the water detection sensor 100 includes a sensor unit 110 and an output unit 120 for outputting a signal detected by the sensor unit 110 .

The sensor unit 110 outputs, to the output unit 120 , a capacitance value that varies depending on the flow of water in a conductive state. To this end, the sensor unit 110 is based on a metal plate, and the present embodiment exemplifies a rectangular shape based on a plan view. In addition, although the present embodiment exemplifies a metal plate type as the sensor unit 110 , the sensor unit 110 according to the present invention may be a metal sheet type other than the metal plate type.

The output unit 120 connects the sensor unit 110 and the substrate 200 to transmit the output value of the sensor unit 110 to the substrate 200 . Here, the output unit 120 is formed to protrude from one side of the sensor unit 110 , and this embodiment exemplifies the output unit 120 protruding from the center of the sensor unit 110 to one side. In addition, the output unit 120 exemplifies a rectangular shape in which a hole is formed in the center, and the output unit 120 and the substrate 200 are screwed together through the center hole of the output unit 120 . In addition, it is preferable that the connection portion between the output unit 120 and the sensor unit 110 is formed in a form in which both sides are cut in order to prevent damage during bending, that is, a cutout portion is formed.

4 is a schematic exploded perspective view of a water detection sensor according to the present invention.

The above-described sensor unit 110 and the output unit 120 exemplify that they are integrally formed, and in this case, the water detection sensor 100 including the sensor unit 110 and the output unit 120 is ' A T' shape is illustrated. In addition, the water detection sensor 100 is formed in a multi-layered structure, and in this embodiment, the water detection sensor 100 is provided on one surface of the metal layer 100a formed of a metal containing copper and the metal layer 100a, and polyimide A resin layer 100b formed of a resin including (Polyimide, PI) and the like, and an adhesive layer 100c provided on the other surface of the metal layer 100a and including a double-sided tape. Here, the adhesive layer 100c is formed only on the sensor unit 110 and is not formed on the output unit 120 . In addition, it is exemplified that a reinforcing material including Kapton, that is, the reinforcing layer 100d is provided on one surface of the output unit 120 . The water sensor 100 is provided so that the sensor unit 110 surrounds the periphery of the flow path 320 of the housing 300 to be described later, and detects water flowing in the flow path 320 . Since the present embodiment exemplifies the flow path 320 in the shape of a circular tube, the sensor unit 110 also exemplifies that it has a cylindrical shape surrounding it. However, the present invention is not limited thereto, and when the shape of the flow path 320 is formed in an elliptical pole shape or a polygonal pole shape including a triangular pole shape, the sensor unit 110 also preferably has a corresponding shape. .

5 is a schematic plan view of a substrate according to the present invention;

The substrate 200 detects a water flow based on an output value of the water detection sensor 100 . To this end, the substrate 200 includes an input unit 210 connected to the water detection sensor 100 , a control unit 220 that detects a water flow based on an output value input to the input unit 210 , and a control unit 220 . It includes a power connector connection unit 230 for applying power.

The input unit 210 is in contact with the output unit 120 of the water detection sensor 100 and transmits an output value output from the water detection sensor 100 to the control unit 220 . To this end, the input unit 210 is preferably formed in a shape corresponding to the shape of the output unit 120 of the water detection sensor 100 . Also, according to this, the input unit 210 exemplifies that the input unit 210 is formed in a square shape with a hole formed in the center based on the plan view, and the output unit 120 and the substrate 200 of the water detection sensor 100 are inserted by inserting a screw into the corresponding hole. ) to illustrate that the input unit 210 is fastened.

6 is a block diagram of a control unit according to the present invention.

The control unit 220 detects a water flow based on an output value of the water detection sensor 100 . Here, the control unit 220 controls the water detection sensor 100 according to the state of the solenoid valve (2000 in FIG. 7 ), and for this purpose, the control unit 220 includes the timer 221 and the voltage for measuring the input voltage of the solenoid valve It includes a measurement module 222 , a valve state determination module for determining the state of the solenoid valve, a heater control module 224 for controlling the heater, and a water detection module 225 for detecting water according to the state of the solenoid valve.

The timer 221 is for determining the operating time of the voltage measurement module 222, the heater control module 224, and the water detection module 225, and the voltage measurement module 222, the heater control module 224, and the water The detection module 225 operates with reference to the timer 221 .

The voltage measuring module 222 measures a voltage input to operate the solenoid valve. The solenoid valve according to the present embodiment operates by receiving 12V input from the vehicle. Accordingly, the voltage measurement module 222 measures the voltage applied to the solenoid valve by counting the timer 221 , for example, every 1 ms, and when 12V is measured, the voltage is transmitted to the valve state determination module 223 to be described later.

The valve state determination module 223 determines the on/off state of the solenoid valve. This may be determined by sensing the voltage inputted when the plunger of the solenoid valve is controlled by the vehicle control device by the voltage measuring module 222 described above. To this end, the above-described substrate 200 is connected to a solenoid valve to sense a voltage applied to the solenoid valve, and a valve connection unit 240 including a first valve connection unit 240 and a second valve connection unit 240 is provided. do.

On the other hand, since the present invention detects that the solenoid valve is on by measuring the voltage applied to the solenoid valve, the valve state determination module 223 receives the solenoid valve on signal from the voltage measurement module 222 using the PWM signal. get accredited That is, the conventional vehicle generally uses LIN communication, but the present invention performs communication in the PWM method because voltage is measured. In addition, although the existing LIN communication requires two communication channels including TX and RX, the present invention uses one communication channel, so that the communication protocol can be simplified.

The heater control module 224 controls the heater according to the ambient temperature of the substrate 200 . In this embodiment, the substrate 200 or the temperature around the substrate 200 is measured using a temperature sensor. Here, the heater control module 224 controls the heater when the temperature measured by the temperature sensor is less than the reference minimum temperature, for example, 10 degrees Celsius so that the temperature is 10 degrees Celsius or more. Of course, the heater control module 224 may turn off the heater when the temperature measured by the temperature sensor is the reference maximum temperature, for example, 20 degrees Celsius or more. Here, the heater according to the present embodiment is located around the flow path 320 and operates when the temperature is low, such as in winter, to prevent the water from freezing. Meanwhile, in this embodiment, the heater control module 224 or the water detection sensor 100 may be corrected based on the temperature measured by the temperature sensor. That is, since the zero point of the water sensor 100 may vary according to temperature, in the present embodiment, the reference value for detecting water by the water sensor 100 may be changed according to a change in temperature.

The water detection module 225 measures the output value output from the water detection sensor 100 when a voltage is applied to the solenoid valve, that is, when the solenoid valve is on in the valve state determination module, as a reference value, that is, when water flows. It detects water by comparing it with the capacitance value. In the water sensor according to this embodiment, when water flows in the flow path 320 , the capacitance value output from the water detection sensor 100 rapidly increases, and when water does not flow in the flow path 320 , the capacitance value is the reference value. It returns to the initial value which is less than or equal to. Therefore, using this, the water sensing module can know that water flows through the flow path 320 of the housing 300 .

On the other hand, the present invention can relatively accurately correct the reference capacitance value by sensing the flow of water when a voltage is applied to the solenoid valve. That is, since water flows when voltage is applied to the solenoid valve, the capacitance value sensed at this time is the capacitance value when water flows. Accordingly, according to the present invention, the capacitance value measured immediately before every predetermined period may be used as the reference capacitance value to correct the capacitance value. Unlike the present invention, when the water flow is always sensed, an error may occur in detecting the water flow interruption when the water flow starts in a situation where the reference capacitance value is changed by an external factor. However, in the present invention, an error can be prevented by detecting the flow of water with the water sensor and correcting the reference capacitance value only when detecting the ON state of the solenoid valve by measuring the voltage.

Meanwhile, in the present invention, the shield unit 260 is formed along the edge of the input unit 210 to prevent external noise from being input to the output value of the output unit 120 . The shield unit 260 is formed by arranging a plurality of through-holes connected to the ground at predetermined intervals along the edge of the input unit 210 . In addition, it is possible to reliably detect the flow of water in the flow path 320 through the water sensor 100 by reducing the introduction of external noise into the input unit 210 .

In addition, the above-described substrate 200 may further include a heater connection part 250 including the first heater connection part 250 and the second heater connection part 250 . In this case, the present invention can prevent the flow path 320 from freezing when the temperature is lowered such as in winter by providing a PTC heater. Of course, for this, a temperature sensor for measuring the internal temperature of the water sensor must be provided, and it is preferable to operate the PCT heater when the temperature is lower than a predetermined reference temperature.

The housing 300 accommodates and protects the substrate 200 and the water sensor 100 , and includes a flow path 320 to allow water to flow so that the water sensor 100 detects water flowing through the flow path 320 . . Accordingly, the housing 300 includes a substrate receiving unit 310 for accommodating the substrate 200, a flow path 320 through which water moves, a first connector unit 330 for receiving a connector receiving power from the outside, and and a second connector part 340 .

The substrate accommodating part 310 has a rectangular box shape with an open top, and the substrate 200 is accommodated therein. Here, the upper part of the substrate receiving part 310 is opened in order to be mounted on a water collecting device to be described later. Accordingly, in some cases, the upper portion of the substrate receiving unit 310 may be closed.

The flow path 320 is formed in a tubular shape extending from an upper portion of one side of the substrate receiving unit 310 to a lower portion. Accordingly, water may flow into the flow path 320 , and the sensor unit 110 of the water detection sensor 100 is wound around the flow path 320 in a circular band shape to detect water flowing through the flow path 320 . do.

The first connector part 330 and the second connector part 340 receive a connector supplied to the board 200 by receiving power from the outside. Although the drawing shows that the first connector part 330 is provided at the lower part of the housing 300 and the second connector part 340 is provided on the side surface of the housing 300 , the location of the connector part according to the present invention is thus not limited That is, the position of the connector part may be changed according to the position of the power connector of the board 200 .

In addition, a groove is formed along the upper edge of the housing 300 described above, and a packing P is provided in the groove to maintain airtightness when combined with a water collection device to be described later. Moreover, airtightness may be increased by providing the first O1 and the second O2 O2 in the flow path 320 and the connector portion.

Meanwhile, the present invention may further include a heat shrinkable tube surrounding the sensor unit 110 of the water sensor 100 .

The heat shrinkable tube is provided to surround the outer surface of the sensor unit 110 surrounding the outer surface of the flow path 320 of the housing 300 . In this embodiment, the sensor unit 110 is adhered to the flow path 320 of the housing 300 by the adhesive layer 100c of the water detection sensor 100 described above. However, in this case, there may be a possibility that the water detection sensor 100 is separated from the flow path 320 because the adhesive force is not strong enough. Therefore, in the present embodiment, the water detection sensor 100 is separated from the flow path 320 by additionally providing a heat shrink tube surrounding the sensor unit 110 of the water detection sensor 100 to press the outer surface of the sensor unit 110 . you can avoid doing it. Furthermore, since the heat shrinkable tube is provided on the outer surface of the sensor unit 110 , it is possible to prevent external noise from being introduced into the sensor unit 110 .

As described above, the present invention can reliably detect water passing through the flow path 320 using the FPCB type water sensor 100 including the metal layer 100a and the resin layer 100b. In addition, according to the present invention, by forming the shield unit 260 connected to the ground around the input unit 210 of the substrate 200 , it is possible to minimize the introduction of external noise into the input unit 210 . In the present invention, a heat-shrinkable tube is provided on the outer surface of the sensor unit 110 to prevent the water detection sensor 100 from being separated from the outer surface of the flow path 320 .

Next, a water collection device to which a water sensor according to the present invention is applied will be described with reference to the drawings. Among the content to be described below, content overlapping with the description of the water sensor according to the present invention described above will be omitted or briefly described.

7 is a schematic cross-sectional view of a water collection device equipped with a water sensor according to the present invention.

As shown in FIG. 7, the water collection device according to the present invention includes a storage tank 1000 for storing water, a solenoid valve 2000 for controlling whether the water stored in the storage tank 1000 is discharged, and a solenoid valve 2000. It includes a water sensor 3000 for detecting the water discharged by the.

The storage tank 1000 may store water, that is, condensed water generated by the hydrogen vehicle. Also, when the water stored in the storage tank 1000 is stored above a certain level, the water is discharged to the outside by the operation of the solenoid valve 2000 . The storage tank 1000 includes a storage tank body 1100 , a water storage space 1200 formed in the storage tank body 1100 , and a discharge path 1300 for discharging water stored in the water storage space 1200 . In addition, a water level sensor S for detecting water stored in the water storage space 1200 may be provided at a lower portion of the water storage space 1200 .

The solenoid valve 2000 controls that water discharged through the discharge path 1300 of the storage tank 1000 flows into the flow path 320 of the water sensor 3000 . To this end, the solenoid valve 2000 includes a valve unit 2100 for controlling the flow of a fluid, and a solenoid unit 2200 for controlling the valve unit 2100 by magnetic force.

The valve unit 2100 controls that water discharged from the water storage space 1200 to the discharge path 1300 flows into the flow path 320 . To this end, the valve unit 2100 is coupled to the diaphragm 2110 and the central portion of the diaphragm 2110 and reciprocates up and down by the solenoid unit 2200 to open and close the discharge path 1300 of the storage tank 1000. and a plunger 2120 to control the flow. In addition, it may include a spring 2130 for restoring the position of the plunger 2120, and a spring guide 2140 for guiding the spring 2130. The spring 2130 causes the plunger 2120 to rise as the core 2210 is magnetized when the solenoid valve 2000 is operated to come into contact with the core 2210 and then return to the original position when the magnetic force of the core 2210 disappears. .

The solenoid part 2200 controls the position of the plunger 2120 . To this end, the solenoid unit 2200 is located at the center of the coil 2230 to which power is applied, the bobbin 2220 around which the coil 2230 is wound, and the bobbin 2220, and a plunger 2120 is provided therein. 2210). Here, a case may be formed outside the bobbin 2220 , and accordingly, the coil 2230 may be surrounded by the bobbin 2220 and the case.

The water sensor 3000 senses a voltage applied when the solenoid valve 2000 is operated, for example, 12V, and when the operation of the solenoid valve 2000 is detected, the flow path 320 through the water sensor 100 detect water flow. The water sensor 3000 is coupled to the lower portion of the storage tank 1000 so that the inlet of the flow path 320 is located at the valve part 2100 of the solenoid valve 2000 .

Hereinafter, a method for detecting water according to the present invention will be described with reference to the drawings.

8 is a flowchart of a water sensing method according to the present invention.

As shown in FIG. 8 , the method for detecting water according to the present invention includes a step of measuring a temperature (S1), a step of measuring a voltage (S2), and a step of detecting water (S3).

In the step of measuring the temperature ( S1 ), the temperature of the substrate ( 200 in FIG. 1 ) or around the substrate is measured according to a timer. Here, when the measured temperature is less than the reference minimum temperature, the heater control module operates the heater to increase the temperature, and when the measured temperature is greater than the reference maximum temperature, the operation of the heater is stopped. Accordingly, since the temperature of the substrate or the surroundings of the substrate is always within the reference value in winter, water can be reliably detected. In addition, in the step S1 of measuring the temperature, the timer reference may be 1 ms, and in this case, the temperature is measured every 1 ms.

In the step of measuring the voltage (S2), the voltage applied to the solenoid valve is measured according to the timer. Here, in the step (S2) of measuring the voltage, the controller may receive a signal from the solenoid valve in a PWM manner and measure the voltage. In addition, in the step (S2) of measuring the voltage, the voltage is measured from the solenoid valve at a predetermined interval according to a timer, and the predetermined interval may be 1 ms.

In the step of detecting water (S3), when the voltage measured in step (S2) of measuring the voltage is equal to or greater than the reference voltage, water flowing through the flow path is sensed using a water sensor. Here, the step (S3) of detecting water is also performed after a predetermined counting through a timer after the step (S2) of measuring the voltage, wherein the timer counting may be 1 ms. In addition, in the step of detecting water ( S3 ), if the capacitance value measured by the water detection sensor is equal to or greater than the reference capacitance value, it is determined that water is sensed.

9 is a PWM signal graph according to the water detection method according to the present invention.

Referring to FIG. 9 , when water is not detected and water is sensed in a state in which the heater is turned off, and the solenoid valve voltage is converted to a state equal to or greater than a reference voltage, the PWM duty ratio is increased. In addition, when gas is sensed in this state (it is sensed that hydrogen to be recovered is discharged to the flow path), the PWM duty ratio is further increased. In addition, when no water is detected and the heater is on, the PWM duty ratio decreases again.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in the present specification. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention are not explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

100: water detection sensor 110: sensor unit
120: output unit 100a: metal layer
100b: resin layer 100c: adhesive layer
100d: reinforcing layer 200: substrate
210: input unit 220: control unit
221: timer 222: voltage measurement module
223: valve status determination module 224: heater control module
225: water detection module 230: power connector connection part
240: valve connection 241: first valve connection
242: second valve connection part 250: heater connection part
251: first heater connection part 252: second heater connection part
260: shield unit 300: housing
310: substrate receiving unit 320: flow path
330: first connector part 340: second connector part
1000: storage tank 1100: storage tank body
1200: water storage space 1300: discharge path
2000: solenoid valve 2100: valve part
2110: diaphragm 2120: plunger
2121: damper 2122: damper flow path
2130: spring 2140: spring guide
2200: solenoid unit 2210: core
2220: bobbin 2230: coil
2240: terminal 3000: water sensor
O1: 1st O-ring O2: 2nd O-ring
P: packing S: level sensor
<01>

Claims (6)

a storage tank in which condensed water is stored and discharged to a discharge path;
a solenoid valve for controlling the discharge of water to the discharge passage;
A water detection sensor including a housing having a flow path through which the condensed water discharged to the discharge path flows, and a metal layer surrounding the flow path and a resin layer provided on one surface of the metal layer. When detecting a voltage applied when the solenoid valve operates, the water A water collecting device comprising a substrate provided with a control unit for detecting the water flowing through the flow path due to a change in the capacitance value of the detection sensor.
According to claim 1,
The control unit is
timer and
A voltage measuring module for measuring the voltage applied to the solenoid valve every predetermined time according to the timer;
A valve state determination module that determines that the solenoid valve is in an on state when the voltage measured by the voltage measurement module is greater than or equal to a reference voltage, and
When the valve state determination module determines that the solenoid valve is in an on state, a water detection module comprising a water detection module for detecting water flowing in the flow path by comparing the capacitance value measured by the water detection sensor with a reference capacitance value Device.
3. The method of claim 2,
A temperature sensor provided on the substrate to measure a temperature inside the housing and a heater for generating heat are provided;
The controller further comprises a heater control module for operating the heater when the temperature measured by the temperature sensor is less than the reference minimum temperature, and stopping the heater when the temperature measured by the temperature detection sensor is greater than or equal to the reference maximum temperature. collection device.
3. The method of claim 2,
When the valve state determination module determines that the solenoid valve is in an on state, the control unit corrects the reference capacitance value to the capacitance value immediately measured by the water detection sensor.
5. The method of claim 3 or 4,
The water sensor is
a sensor unit surrounding the flow path;
and an output unit protruded and bent from the sensor unit and connected to the substrate,
A water collecting device in which a cutout is formed at a contact point between the sensor unit and the output unit.
6. The method of claim 5,
An input unit to which the output unit is connected is formed on the substrate and is connected to the control unit,
A water collecting device spaced apart from the input unit at an edge of the input unit, and formed with a shield unit having a plurality of through-holes connected to the ground spaced apart from each other.

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