Automatic faucet system

Abstract

To provide an automatic faucet device capable of improving workability and maintainability.SOLUTION: An automatic faucet device according to an embodiment provided on a high-back surface or provided above the high-back surface comprises: a body part that projects forward from the high-back surface and has an internal space; a water discharge part that has a water discharge port for discharging hot-water and water; a mixing part that is housed in the internal space of the body part and mixes the hot-water and the water from a water supply source; and a thermistor unit that is placed in a flow path between the water discharge part and the mixing part and detects a temperature of the hot-water and the water flowing out of the mixing part, wherein the thermistor unit is housed in the internal space of the body part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The disclosed embodiments relate to automatic faucet devices.

Background Art

[0002] Conventionally, some automatic faucet devices used in washbasins and the like are provided on a high-back surface extending upward from a bowl portion or above the high-back surface (see, for example, Patent Document 1). Further, in the automatic faucet device, a thermistor unit for detecting the water temperature is arranged in a flow path on the downstream side of a mixing portion that mixes hot and cold water in order to prevent the user from being burned.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a conventional automatic faucet device, there is a sufficient distance in the flow path between the mixing portion and the water discharge portion that discharges hot and cold water. For this reason, the thermistor unit is arranged in a space formed below the bowl portion that also serves as a passage of the flow path.

[0005] However, since the thermistor unit is a member that requires connection and maintenance during construction, if the thermistor unit is arranged in the space below the bowl portion as in a conventional automatic faucet device, an operator has to crawl under the bowl portion to perform work. Thus, there has been room for improvement in the workability and maintainability of the conventional automatic faucet device.

[0006] One aspect of the embodiment aims to provide an automatic faucet device that can improve workability and maintainability.

Means for Solving the Problems

[0007] An automatic faucet device according to one embodiment is an automatic faucet device provided on or above a high back surface extending above a bowl portion, comprising: a main body portion protruding forward from the high back surface and having an internal space; a water outlet portion having a spout for discharging hot and cold water; a mixing portion housed in the internal space of the main body portion and mixing hot and cold water from a water source; and a thermistor unit arranged in the flow path between the water outlet portion and the mixing portion and detecting the temperature of the hot and cold water discharged from the mixing portion, wherein the thermistor unit is housed in the internal space of the main body portion.

[0008] With this configuration, since the thermistor unit is housed in the internal space of the main body, workers do not need to crawl under the bowl to perform connection or maintenance of the thermistor unit during installation. This improves the ease of installation and maintenance of automatic faucet devices installed on or above a high back surface.

[0009] Furthermore, in the automatic faucet device described above, the thermistor unit comprises a thermistor flow path member through which hot and cold water flows, and a thermistor for measuring the temperature of the hot and cold water flowing through the thermistor flow path member, and the thermistor flow path member is detachably connected to the mixing section.

[0010] With this configuration, for example, if the thermistor fails, the thermistor flow path component can be removed from the mixing section and only the thermistor unit needs to be replaced, thus further improving maintainability.

[0011] Furthermore, in the above-described automatic faucet device, the thermistor flow path member is detachably connected to the mixing section without removing the mixing section from the main body.

[0012] With this configuration, for example, if the thermistor fails, the thermistor flow path component can be removed from the mixing section, and the thermistor unit can be easily replaced in the internal space of the main body, thereby further improving maintainability.

[0013] Furthermore, the above-described automatic faucet device is characterized in that it is equipped with a primary water supply pipe that supplies hot and cold water from a water source to a mixing section, the main body has a hole in its lower surface through which the primary water supply pipe is inserted, the thermistor flow path member has a connecting end that connects to the mixing section, and the connecting end is located outside the hole.

[0014] With this configuration, water (hot water) dripping from the connection end of the thermistor flow channel member to the mixing section does not fall directly into the hole, thus preventing water (hot water) from entering the hole.

[0015] Furthermore, in the above-described automatic faucet device, the mixing section is characterized by having a protrusion formed outside the hole to prevent water from seeping through.

[0016] With this configuration, the water (hot water) flowing along the outer surface of the thermistor flow channel member can be blocked by the protrusions, thereby more effectively preventing water (hot water) from entering the holes in the main body.

[0017] Furthermore, the above-described automatic faucet device is characterized by being equipped with a check valve to prevent backflow of hot and cold water, and the check valve being arranged inside the flow path of the thermistor flow path member.

[0018] With this configuration, the thermistor unit and check valve can be replaced simultaneously, reducing the time and effort required for replacement and further improving maintainability.

[0019] Furthermore, in the above-described automatic faucet device, the thermistor flow channel member is characterized by being made of resin.

[0020] According to such a configuration, since the thermistor flow path member is made of resin, the thermistor flow path member can be obtained at a low cost. Further, even if the resin-made thermistor flow path member is damaged, since the thermistor flow path member is housed in the internal space of the main body portion, the damage will not spread.

[0021] Also, in the automatic faucet device described above, the mixing portion and the thermistor unit are arranged on one side in the left-right direction in the internal space of the main body portion.

[0022] According to such a configuration, even when the thermistor unit is a product with a different specification from the mixing portion, it is always arranged on the same side (one side in the left-right direction), so that the internal space of the main body portion is prevented from being compressed by the arrangement space of the thermistor unit, and the thermistor unit can be efficiently housed in the internal space of the main body portion. Thereby, the enlargement of the main body portion can be suppressed.

[0023] Also, in the automatic faucet device described above, it includes a pull-out hose housed in the internal space of the main body portion and capable of being pulled out from the main body portion together with the water discharge portion, and the pull-out hose is arranged on the other side in the left-right direction in the internal space of the main body portion when the water discharge portion is not pulled out from the main body portion.

[0024] According to such a configuration, the thermistor unit and the pull-out hose can be efficiently housed in the internal space of the main body portion, and thereby, the enlargement of the main body portion can be suppressed.

[0025] In addition, in the automatic faucet device described above, a control unit that prohibits water discharge based on the detection result of the thermistor unit is provided. When the control unit detects a temperature higher than the first temperature, it prohibits water discharge. After that, when the thermistor unit detects a temperature that is equal to or higher than the first temperature and lower than a third temperature that is higher than the first temperature, if the thermistor unit continuously detects a second temperature lower than the first temperature for a first period of time, the prohibition of water discharge is cancelled. When the thermistor unit detects a temperature higher than the first temperature, water discharge is prohibited. After that, when a temperature equal to or higher than the first temperature and equal to or higher than the third temperature is detected, if the thermistor unit detects the second temperature for a second period of time that is longer than the first period of time, the prohibition of water discharge is cancelled. This is the gist of the present invention.

[0026] For example, when the thermistor unit is housed in the internal space of the main body, the distance between the mixing unit and the thermistor unit becomes shorter. Therefore, compared with the case where the thermistor unit is disposed below the bowl unit, it is easier to detect a low temperature, and there is a possibility that the prohibition of water discharge is cancelled at an inappropriate timing, resulting in a problem that hot water at a high temperature is discharged. However, according to such a configuration, even when the thermistor unit is disposed in the internal space of the main body, it is possible to suppress the occurrence of a problem that hot water at a high temperature is discharged.

Effect of the Invention

[0027] According to one aspect of the embodiment, workability and maintainability can be improved.

Brief Description of the Drawings

[0028] [Figure 1] FIG. 1 is a schematic perspective view showing an automatic faucet device according to an embodiment. [Figure 2] FIG. 2 is a schematic side cross-sectional view showing the internal space of the main body. [Figure 3] FIG. 3 is a schematic exploded perspective view showing the thermistor unit. [Figure 4] FIG. 4 is a schematic perspective view showing the convex portion of the mixing unit. [Figure 5]Figure 5 is a schematic cross-sectional view showing the convex portion of the mixing area. [Figure 6] Figure 6 is a flowchart showing the procedure for releasing the water discharge ban. [Figure 7] Figure 7 is a timing chart (part 1) for lifting the water discharge ban. [Figure 8] Figure 8 is the timing chart (part 2) for lifting the water discharge ban. [Modes for carrying out the invention]

[0029] The embodiments of the automatic faucet device disclosed herein will be described in detail below with reference to the attached drawings. However, the present invention is not limited to the embodiments described below.

[0030] <Overall configuration of an automatic faucet system> First, the overall configuration of the automatic faucet device 1 according to this embodiment will be described with reference to Figure 1. Figure 1 is a schematic perspective view showing the automatic faucet device 1 according to this embodiment.

[0031] Note that each figure, including Figure 1, shows a three-dimensional Cartesian coordinate system that includes the Z-axis, with the vertically upward direction (upward) being the positive direction. For the sake of explanation, below, the positive direction of the X-axis is defined as left, the negative direction of the X-axis as right, the positive direction of the Y-axis as forward, and the negative direction of the Y-axis as backward. Therefore, below, the X-axis direction will be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

[0032] Furthermore, the automatic faucet device 1 is installed, for example, on a washbasin. The washbasin includes the automatic faucet device 1 and the washbasin, as well as, for example, a support base, a cabinet, and a lighting device. The washbasin comprises a bowl section (not shown) and a high back surface 2 (see Figure 2). The bowl section receives hot and cold water (hereinafter referred to as "water," and this "water" includes heated hot water) discharged from the automatic faucet device 1.

[0033] The high back surface 2 is a surface that extends upward from the rear end of the bowl portion. The automatic faucet device 1 is installed on the high back surface 2. The automatic faucet device 1 protrudes forward from the high back surface 2. Alternatively, the automatic faucet device 1 may be installed above the high back surface 2. In this case as well, the automatic faucet device 1 protrudes forward from the high back surface 2, that is, toward the bowl portion.

[0034] As shown in Figure 1, the automatic faucet device 1 comprises a main body 11, a water outlet 12, and an operating unit 13. The main body 11 is formed in a shape that is elongated in the left-right direction (for example, rectangular). The rear side of the main body 11 is attached, for example, to a high back surface 2 or above the high back surface 2, and is provided to protrude forward from the high back surface 2.

[0035] The main body 11 houses the base end (rear side) of the water discharge section 12 and the operating section 13, which will be described later. The main body 11 also houses, for example, a part of the water supply hose (also called a pull-out hose) to which the water discharge section 12 is attached via the secondary water supply pipe 20 (see Figure 2), which will be described later. A flexible hose or the like is used for the pull-out hose 20.

[0036] The water outlet 12 discharges water toward the bowl located below the automatic faucet device 1. The water outlet 12 is a so-called spout. The water outlet 12 is equipped with a water outlet 12a. Furthermore, as described above, the water outlet 12 is connected to the tip of the pull-out hose 20 housed in the main body 11, and is configured to be able to be pulled out (pulled out) toward the user facing the automatic faucet device 1, for example. Note that the water outlet 12 is not limited to a pull-out type that can be pulled out together with the pull-out hose 20, and the water outlet 12 may also be a fixed type.

[0037] The water outlet 12 is connected to a water source (not shown) via a mixing unit 30 (see Figure 2) that mixes hot and cold water. The water discharged from the water outlet 12 is, for example, tap water.

[0038] The operating unit 13 includes an operating lever 13a. The operating unit 13 adjusts the flow rate and temperature of the water discharged from the water discharge unit 12 in response to the user's operation of the operating lever 13a. The upper end of the operating lever 13a is pivotally supported on the mixing unit 30 so that it can swing, for example, in the forward / backward and left / right directions.

[0039] The operating lever 13a adjusts the flow rate of water from the water outlet 12 by swinging it, for example, in the forward and backward direction, and adjusts the temperature of the water from the water outlet 12 by swinging it, for example, in the left and right direction. Note that the manner in which the flow rate and temperature are adjusted by the operating unit 13 is not limited to the operating lever 13a, but may be any manner. Note that the temperature adjustment of the water discharged from the water outlet 12 may be performed by an adjustment unit separate from the operating unit 13, and the operating unit 13 only needs to be able to adjust the flow rate of water discharged from the water outlet 12.

[0040] Furthermore, the operating unit 13 includes the mixing unit 30 described above. A primary water supply pipe 61 is connected to the mixing unit 30 to supply water from a water source to the mixing unit 30. The primary water supply pipe 61 extends upward on the rear side of the high back surface 2 and is connected to the mixing unit 30 from below, for example.

[0041] Furthermore, the automatic faucet device 1 is equipped with a sensor. The sensor detects objects such as the user's hand near the spout 12a. Based on the detection of an object by the sensor, the automatic faucet device 1 automatically stops the water flow.

[0042] <Thermistor Unit> Next, the thermistor unit 40 will be described with reference to Figures 2 and 3. Figure 2 is a schematic side cross-sectional view showing the internal space S of the main body 11. Figure 3 is a schematic exploded perspective view showing the thermistor unit 40.

[0043] As shown in Figure 2, the main body 11 of the automatic faucet device 1 is mounted, for example, on a high back surface 2 and protrudes forward from the high back surface 2. The main body 11 has a space (hereinafter referred to as the internal space) S inside it.

[0044] Furthermore, to prevent burns to the user, the automatic faucet device 1 includes a thermistor unit 40 that detects the temperature of the water inside the automatic faucet device 1. This thermistor unit 40 is positioned between the mixing unit 30, which mixes hot and cold water from the water source, and the pull-out hose 20, which is the secondary water supply pipe that flows downstream of the mixing unit 30. The thermistor unit 40 detects the temperature of the water flowing out of the mixing unit 30. The mixing unit 30 is housed in the internal space of the main body 11.

[0045] Furthermore, the thermistor unit 40 is housed in the internal space S of the main body 11. The mixing unit 30 and the thermistor unit 40 are arranged on one side (left side in the illustrated example) of the internal space S of the main body 11.

[0046] Furthermore, the pull-out hose 20, which can be pulled out (pulled out) from the main body 11 along with the water discharge unit 12, is positioned on the other side (right side in the illustrated example) of the internal space S of the main body 11 when the water discharge unit 12 is not pulled out from the main body 11.

[0047] Furthermore, for example, a control unit 100 (hereinafter referred to as a control unit) 100 is arranged on the left or right side (in the illustrated example, the right side) of the internal space S of the main body 11 to control each part in order to automatically dispense and stop water in the automatic faucet device 1.

[0048] The control unit 100 is implemented, for example, by executing a program stored in a memory unit (not shown) using a RAM (Random Access Memory) as the working area, using a CPU (Central Processing Unit) or MPU (Micro Processing Unit). The memory unit is implemented, for example, by semiconductor memory elements such as RAM or flash memory.

[0049] As shown in Figure 3, the thermistor unit 40 comprises a thermistor flow channel member 41, a thermistor 42, and a check valve 43. The thermistor flow channel member 41 is made of resin. The thermistor flow channel member 41 is connected to the connecting member 31 of the mixing unit 30. The thermistor flow channel member 41 is detachably connected to the mixing unit 30.

[0050] Therefore, the thermistor flow channel member 41 can be removed, for example, if the thermistor unit 40 is to be removed, without removing the mixing section 30 from the main body 11. Similarly, when installing the thermistor unit 40, it can be installed without removing the mixing section 30 from the main body 11.

[0051] When the thermistor flow path member 41 is connected to the connecting member 31 of the mixing section 30, it is fixed together with the connecting member 31 by a fastener 51 from a direction perpendicular to the axial direction, thereby connecting to the mixing section. Similarly, when the thermistor flow path member 41 is connected to the pull-out hose 20, it is fixed together with the pull-out hose 20 by a fastener 52 from a direction perpendicular to the axial direction, thereby connecting to the pull-out hose 20.

[0052] The thermistor 42 measures the temperature of the water flowing through the thermistor flow channel member 41. The measurement result (measured value or resistance value) of the thermistor 42 is output to the control unit 100 and used by the control unit 100 for high-temperature hot water output control, etc.

[0053] The check valve 43 is a valve body component that prevents backflow of water from the pull-out hose 20, which is the secondary water supply pipe. Such a check valve 43 is placed inside the flow path of the thermistor flow path component 41.

[0054] <Connection section between the mixing unit and thermistor unit> Next, the connection between the mixing section 30 and the thermistor unit 40 will be described with reference to Figures 4 and 5. Figure 4 is a schematic perspective view showing the protrusion 31a of the mixing section 30. Figure 5 is a schematic cross-sectional view showing the protrusion 31a of the mixing section 30.

[0055] As shown in Figure 4, the connecting member 31 of the mixing section 30 (see Figure 5) is provided with a protrusion 31a on its outer circumferential surface. The protrusion 31a protrudes downward from the outer circumferential surface of the connecting member 31, perpendicular to the axial direction of the connecting member 31.

[0056] As shown in Figure 5, the main body 11 has a hole 32 formed on its lower surface through which a primary water supply pipe 61, which supplies water W1 and W2 from the water source to the mixing section 30, is inserted. The thermistor flow channel member 41 also has a connecting end 41a that connects to the mixing section 30. The connecting end 41a is located outside the hole 32. In this way, because the connecting end 41a is located outside the hole 32, even if water W3 flowing through the thermistor flow channel member 41 drips from the connecting end 41a, the dripping water W4 does not fall directly into the hole 32, thus preventing water W4 from entering the hole 32.

[0057] Furthermore, as shown in Figure 5, the protrusion 31a of the connecting member 31 is also provided to prevent so-called water runoff, such as water W4 dripping from the connecting end 41a of the thermistor flow channel member 41 traveling along the flow channel to the hole 32.

[0058] As described above, in the automatic faucet device 1 according to the embodiment described above, since the thermistor unit 40 is housed in the internal space S of the main body 11, it is not necessary for an operator to crawl under the bowl when connecting or maintaining the thermistor unit 40 during installation. This improves the ease of installation and maintenance of the automatic faucet device 1 installed on or above the high back surface 2.

[0059] Furthermore, since the thermistor flow channel member 41 is detachably connected to the mixing unit 30, for example, if the thermistor 42 fails, the thermistor flow channel member 41 can be removed from the mixing unit 30 and only the thermistor unit 40 can be replaced, thus further improving maintainability.

[0060] Furthermore, since the thermistor flow channel member 41 is detachably connected to the mixing section 30 without removing the mixing section 30 from the main body 11, for example, if the thermistor 42 fails, the thermistor flow channel member 41 can be removed from the mixing section and the thermistor unit 40 can be easily replaced in the internal space S of the main body 11, thereby further improving maintainability.

[0061] Furthermore, since the connection end 41a of the thermistor flow channel member 41 is located outside the hole 32, water W4 dripping from the connection end 41a of the thermistor flow channel member 41 to the mixing section 30 does not fall directly into the hole 32, thus preventing water W4 from entering the hole 32.

[0062] Furthermore, since the mixing section 30 has a protrusion 31a located outside the hole 32, the water W4 that has flowed along the outer surface of the thermistor flow channel member 41 can be blocked by the protrusion 31a, thereby more effectively suppressing the intrusion of water W4 into the hole 32.

[0063] Furthermore, since the check valve 43 is positioned inside the flow path of the thermistor flow path member 41, the thermistor unit 40 and the check valve 43 can be replaced simultaneously, reducing the time and effort required for replacement and further improving maintainability.

[0064] Furthermore, since the thermistor flow channel member 41 is made of resin, it can be obtained at a low cost. Also, even if the resin thermistor flow channel member 41 is damaged, the damage will not spread because the thermistor flow channel member 41 is housed in the internal space S of the main body 11.

[0065] Furthermore, since the thermistor unit 40 is always positioned on the same side (left or right) relative to the mixing section 30, even in the case of products with different specifications, the internal space S of the main body 11 is not compressed by the space required for the thermistor unit 40, and the thermistor unit 40 can be efficiently housed in the internal space S of the main body 11. This helps to prevent the main body 11 from becoming too large.

[0066] Furthermore, since the pull-out hose 20 is positioned on the left or right side of the internal space S of the main body 11 when the water discharge section 12 is not pulled out from the main body 11, the thermistor unit 40 and the pull-out hose 20 can be efficiently housed in the internal space S of the main body 11, thereby preventing the main body 11 from becoming larger.

[0067] <Water discharge ban lifted> Next, the release of the water discharge prohibition in the high-temperature hot water output control by the control unit 100 (see Figure 1) will be explained with reference to Figures 6-8. Figure 6 is a flowchart showing the processing procedure for releasing the water discharge prohibition. Figures 7 and 8 are timing charts for releasing the water discharge prohibition.

[0068] The automatic faucet device 1 has either an automatic mode in which water is dispensed while the sensor detects an object such as the user's hand, or a continuous mode in which water is dispensed continuously, or both. Such automatic and continuous modes are controlled by the control unit 100.

[0069] During operation in automatic mode, the control unit 100 controls the hot water output to prevent burns to the user.

[0070] If the thermistor unit 40 detects a temperature above, for example, a first temperature, it will perform control to close the solenoid valve.

[0071] Furthermore, since the thermistor 42 (see Figure 3) is located relatively close to the mixing section 30 (see Figure 3) of the automatic faucet device 1, if high temperature is detected by the thermistor unit 40, and the water flow rate is low when the water is replaced with low-temperature water after high temperature detection, the temperature will drop only in the thermistor section. Even if the device is reset to a state where automatic water discharge is possible, there is a possibility that high-temperature water remains in the pull-out hose 20, which is the secondary water supply pipe.

[0072] As shown in Figure 6, the control unit 100 determines whether the temperature is a predetermined first temperature (step S101), and if it detects a temperature higher than the first temperature (step S101: Yes), it prohibits water discharge (step S102).

[0073] Here, if the thermistor unit 40 detects a temperature that is above the first temperature and below a third temperature that is higher than the first temperature and prohibits water discharge (step S103: No), the control unit 100 will release the water discharge prohibition (step S106) if the thermistor unit 40 detects a second temperature that is lower than the first temperature for a first time, as shown in Figure 7 (step S104).

[0074] Furthermore, if the thermistor unit 40 detects a temperature that is above the first temperature and above the third temperature (step S103: Yes), the control unit 100 releases the water discharge prohibition (step S106) when the thermistor unit 40 detects the second temperature for a second time longer than the first time (step S105), as shown in Figure 8.

[0075] Thus, for example, when the thermistor unit 40 is housed in the internal space S of the main body 11, the distance between the mixing unit 30 and the thermistor unit 40 becomes shorter. As a result, it is easier to detect low temperatures compared to when the thermistor unit 40 is located below the bowl, and the water discharge prohibition may be released at an inappropriate time, potentially causing a malfunction in which hot residual water is dispensed. However, according to the automatic faucet device 1 of the embodiment described above, even when the thermistor unit 40 is located in the internal space S of the main body 11, the occurrence of the malfunction in which hot residual water is dispensed can be suppressed.

[0076] Further effects and modifications can be readily derived by those skilled in the art. Therefore, broader aspects of the present invention are not limited to the specific details and representative embodiments expressed and described above. Accordingly, various modifications are possible without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents. [Explanation of Symbols]

[0077] 1. Automatic faucet device 2 High back surfaces 11 Main body 12. Water outlet 12a Spout 20 Pull-out hoses 30 Mixing section 31a Convex part 32 Hole 40 Thermistor Unit 41 Thermistor flow channel member 41a Connection end 42 Thermistor 43 Check valve 61 Primary side water supply pipe 100 Control Unit S interior space

Claims

1. An automatic faucet device provided on a high back surface extending above the bowl portion, or provided above the high back surface, The main body portion, which protrudes forward from the aforementioned high back surface and has an internal space formed therein, A water outlet having a spout for discharging hot and cold water, A mixing unit, housed in the internal space of the main body, mixes hot and cold water from a water source, A thermistor unit is placed in the flow path between the water discharge section and the mixing section and detects the temperature of the hot water discharged from the mixing section. Equipped with, The thermistor unit is housed in the internal space of the main body. The thermistor unit comprises a thermistor flow channel member through which hot water flows, and a thermistor for measuring the temperature of the hot water flowing through the thermistor flow channel member. The thermistor flow channel member is detachably connected to the mixing section, Primary water supply pipe that supplies hot and cold water from the water source to the mixing section. Equipped with, The main body has a hole on its lower surface through which the primary water supply pipe is inserted. The thermistor flow channel member has a connecting end that is connected to the mixing section, The aforementioned connecting end is located outside the hole. An automatic faucet device characterized by the following features.

2. An automatic faucet device provided on a high back surface extending above the bowl portion, or provided above the high back surface, The main body portion, which protrudes forward from the aforementioned high back surface and has an internal space formed therein, A water outlet having a spout for discharging hot and cold water, A mixing unit, housed in the internal space of the main body, mixes hot and cold water from a water source, A thermistor unit is placed in the flow path between the water discharge section and the mixing section and detects the temperature of the hot water discharged from the mixing section. Equipped with, The thermistor unit is housed in the internal space of the main body. The thermistor unit comprises a thermistor flow channel member through which hot water flows, and a thermistor for measuring the temperature of the hot water flowing through the thermistor flow channel member. The thermistor flow channel member is detachably connected to the mixing section, A check valve to prevent backflow of hot and cold water. Equipped with, The check valve is positioned inside the flow path of the thermistor flow path member. An automatic faucet device characterized by the following features.

3. An automatic faucet device provided on a high back surface extending above the bowl portion, or provided above the high back surface, The main body portion, which protrudes forward from the aforementioned high back surface and has an internal space formed therein, A water outlet having a spout for discharging hot and cold water, A mixing unit, housed in the internal space of the main body, mixes hot and cold water from a water source, A thermistor unit is placed in the flow path between the water discharge section and the mixing section and detects the temperature of the hot water discharged from the mixing section. Equipped with, The thermistor unit is housed in the internal space of the main body. A control unit that prohibits water discharge based on the detection result of the thermistor unit. Equipped with, The control unit prohibits water discharge when it detects a temperature higher than the first temperature, and thereafter, when the thermistor unit detects a temperature that is equal to or higher than the first temperature but lower than the third temperature which is higher than the first temperature, the prohibition on water discharge is released when the thermistor unit detects a second temperature which is lower than the first temperature for a first period of time, and thereafter, when the thermistor unit detects a temperature higher than the first temperature, the prohibition on water discharge is released when it detects a temperature that is equal to or higher than the third temperature, and the thermistor unit detects the second temperature which is longer than the first period of time for a second period of time, An automatic faucet device characterized by the following features.

4. The thermistor flow channel member is detachably connected to the mixing section without removing the mixing section from the main body. The automatic faucet device according to claim 1 or 2.

5. Primary water supply pipe that supplies hot and cold water from the water source to the mixing section. Equipped with, The main body has a hole on its lower surface through which the primary water supply pipe is inserted. The thermistor flow channel member has a connecting end that is connected to the mixing section, The aforementioned connecting end is located outside the hole. The automatic faucet device according to feature 2.

6. The mixing section has a protrusion formed outside the hole to prevent water from seeping through. The automatic faucet device according to claim 1 or 5.

7. A check valve to prevent backflow of hot and cold water. Equipped with, The check valve is positioned inside the flow path of the thermistor flow path member. The automatic faucet device according to feature 1.

8. The thermistor flow channel member is made of resin. The automatic faucet device according to claim 1, 2, 4, 5, 6, or 7.

9. The mixing unit and the thermistor unit are arranged on one side (left or right) of the internal space of the main body. The automatic faucet device according to any one of features 1 to 8.

10. A pull-out hose, housed in the internal space of the main body and retractable from the main body together with the water discharge section. Equipped with, The pull-out hose is positioned on the left or right side of the internal space of the main body when the water discharge section is not pulled out from the main body. The automatic faucet device according to feature 9.

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