JP2018165595A - Water replenishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit excessive increase of an output temperature during power failure where an opening of a flow regulating valve cannot be controlled in a water replenishing device mixing high-temperature water with low-temperature water.SOLUTION: A water replenishing device 100 mixes high-temperature water flowing through high-temperature water flow passages 110a-110c with low-temperature water flowing through low-temperature water flow passages 120a-120c in a mixing section 130 so as to deliver the hot water from a hot water delivery flow passage 140. Motor-driven flow regulating valves 160a-160c and motor-driven opening and closing valves 150a-150c are arranged in series in the high-temperature water flow passages 110a-110c. Each of the opening and closing valves 150a-150c is controlled to be closed during cutting off of power, and is controlled to be opened during supplying of power. Motor-driven flow regulating valves 170a-170c are arranged in the low-temperature water flow passages 120a-120c, and motor-driven opening and closing valves are not arranged therein. The low-temperature water flows into the mixing section 130 without passing through the motor-driven opening and closing valves.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a makeup water apparatus, and more particularly to a makeup water apparatus that mixes and outputs high-temperature water and low-temperature water.

  For the purpose of supplying water to a bathtub or the like, a replenishing water device that mixes high-temperature water from a heat source machine and low-temperature water such as tap water to supply hot water at an appropriate temperature is used. In such a mixed-type makeup water device, the temperature of the hot water is optimized by controlling the flow rate of high-temperature water and low-temperature water.

  As a configuration for controlling the flow rate of fluid, Japanese Patent Application Laid-Open No. 63-67477 (Patent Document 1) includes an electric valve that is controlled to be either fully open or fully closed, and an electromagnetic valve that is opened when energized. A configuration is described in which the flow rate is controlled according to the open / close time ratio of the motor-operated valve in series connection, and the outflow of liquid is prevented by closing the solenoid valve during a power failure.

  Japanese Patent Laying-Open No. 2015-209999 (Patent Document 2) discloses a hot water supply path in which a flow rate adjusting valve and an open / close solenoid valve are connected in series, and is arranged downstream of a joining portion of the pouring path and the hot water supply path. Further, there is described control for detecting an open failure (maintained in an open state) of a solenoid valve based on a detected value by a temperature sensor.

JP-A-63-67477 Japanese Patent Laying-Open No. 2015-209999

  By connecting an open / close solenoid valve and a flow rate adjusting valve that are opened when energized in series as in Patent Document 1, fluid output can be prevented even if the valve opening cannot be controlled during a power failure. However, when a failure (hereinafter, also referred to as “open failure”) in which the open / close solenoid valve is fixed in an open state due to a mechanical failure or the like occurs, the fluid shutoff function at the time of a power failure is impaired.

  In a makeup water device that mixes high-temperature water and low-temperature water, a configuration in which a flow rate adjusting valve is disposed in both the high-temperature water and low-temperature water supply systems is used to control the mixing ratio of high-temperature water and low-temperature water. For this reason, it is necessary to take measures to prevent the output temperature from rising excessively at the time of a power failure in which the opening degree of the flow regulating valve cannot be controlled.

  The present invention has been made to solve such problems, and its purpose is to provide a makeup water device that mixes high-temperature water and low-temperature water in the event of a power failure when the opening degree of the flow control valve cannot be controlled. It is to prevent the output temperature from excessively rising.

  According to an aspect of the present invention, a replenishing water device for supplying water to a water tank includes a high-temperature water channel through which high-temperature water flows, a low-temperature water channel through which low-temperature water whose temperature is lower than that of high-temperature water, and high-temperature water. A low temperature water mixing section, a hot water flow path for outputting hot water mixed by the mixing section to the water tank, an electric first and second flow rate adjusting valve, an electric open / close valve, and a control device With. The mixing unit is connected to the high temperature water channel and the low temperature water channel. The first flow rate adjusting valve is disposed in the high temperature water flow path. The second flow rate adjustment valve is disposed in the low temperature water flow path. The on-off valve is configured to close when not energized while being opened when energized. The control device controls the opening / closing of the on-off valve and the opening degree of the first and second flow rate adjusting valves. The low-temperature water flow path is configured such that low-temperature water flows into the mixing unit without passing through the electric on-off valve. During the water supply operation in which hot water is output from the hot water flow path, the make-up water device generates a power failure when the control device controls the open / close valve to open and the first and second flow control valves to open. Then, the on-off valve is closed in a non-energized state, the first and second flow rate adjusting valves are maintained at the opening when the power failure occurs, and low-temperature water is supplied to the mixing unit and output from the hot water flow path. Configured as follows.

  According to the makeup water device, when a power failure occurs when the first and second flow rate regulating valves are not fully closed, when the on-off valve is normal (no open failure), low temperature water is discharged from the hot water flow path. Is output only. On the other hand, even if an open failure occurs in any of the on / off valves, hot water mixed with low temperature water from the low temperature water flow path and high temperature water supplied via the open / close open / close valve is used as the outlet flow path. Is output from. Therefore, even if an open failure occurs in the on-off valve, it is possible to avoid a situation in which high-temperature water is directly output to the hot water flow path and the bathtub.

  Preferably, the makeup water device further includes first and second temperature detectors. The first temperature detector detects the temperature of the low-temperature water flowing through the low-temperature water flow path. The second temperature detector detects the temperature of the hot water flowing through the hot water flow path. The control device has a diagnostic mode for controlling the closing of the on-off valve and controlling the first and second flow rate regulating valves to the open state. In the diagnosis mode, when the temperature detected by the second temperature detector is higher than the temperature detected by the first temperature detector, a failure in which the on-off valve is fixed in the open state is detected.

  By comprising in this way, the presence or absence of the open / close valve opening failure can be diagnosed by a simple process by comparing the detected temperatures of the first and second temperature detectors.

  More preferably, the diagnosis mode is executed before the start of the water supply operation in which the open / close valve is controlled to open and the first and second flow rate adjustment valves are controlled to be opened to output hot water from the hot water flow path.

  With this configuration, it is possible to start the water supply operation after confirming that no open failure has occurred in the on-off valve in the diagnostic mode.

  Alternatively, more preferably, the diagnosis mode is executed at the end of the water supply operation in which the open / close valve is controlled to open and the first and second flow rate adjustment valves are controlled to be opened to output hot water from the hot water flow path.

  With this configuration, the diagnosis mode is executed at the end of the water supply operation. Therefore, if an open failure has occurred in the on-off valve in the diagnosis mode, the high-temperature water surely opens the on-off valve. It can be expected to be output to the hot water flow path. Accordingly, it is possible to prevent the detection failure of the open failure in the on-off valve failure diagnosis mode.

  Preferably, the makeup water device is configured such that a plurality of high-temperature water flow paths having a first flow rate adjustment valve and an on-off valve and a plurality of low-temperature water flow paths having a second flow rate adjustment valve are arranged. Each time the diagnostic mode is executed, the control device sequentially selects one of the plurality of high-temperature water flow paths as a diagnosis target, controls the closing of the on-off valve in the high-temperature water flow path to be diagnosed, and performs the first flow rate adjustment. While controlling the valve to the open state, the on-off valve is controlled to close in the high-temperature water flow path excluding the diagnosis target, and the first flow rate adjustment valve is controlled to the fully closed state.

  With this configuration, in a configuration in which a plurality of systems (a combination of a high-temperature water channel and a low-temperature water channel) are arranged, the opening / closing valve is opened while sequentially selecting one of the plurality of systems as a diagnosis target. A diagnostic mode for detecting a fault can be executed. Thereby, it becomes possible to specify in which of the plurality of systems the on-off valve in which an open failure is detected in the diagnosis mode.

  According to the present invention, in the makeup water device that mixes high-temperature water and low-temperature water, it is possible to prevent the output temperature from excessively rising during a power failure when the opening degree of the flow rate adjustment valve cannot be controlled.

It is a block diagram which shows the whole structure of the bathtub hot-water supply system to which the makeup water apparatus according to this Embodiment was applied. It is a block diagram which shows the structure of the makeup water apparatus shown as a comparative example with respect to this Embodiment. It is a flowchart explaining the control processing in the diagnostic mode for detecting the open failure of the on-off valve in the makeup water apparatus according to the present embodiment. It is a flowchart explaining the control processing of the modification of the diagnostic mode of the on-off valve in the makeup water apparatus according to this Embodiment. It is a flowchart explaining the 1st example of starting control of the on-off valve diagnostic mode in the makeup water apparatus according to the present embodiment. It is a flowchart explaining the 2nd example of starting control of the diagnostic mode of the on-off valve in the makeup water apparatus according to this Embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated in principle.

  FIG. 1 is a block diagram showing an overall configuration of a bathtub hot-water supply system to which a makeup water device according to the present embodiment is applied.

  Referring to FIG. 1, hot water supply system 5 for bathtub 50 includes a filtration unit 60 and a makeup water device 100 for supplying water to bathtub 50. The makeup water device 100 includes three systems of high-temperature water flow paths 110a to 110c and low-temperature water flow paths 120a to 120c, a mixing unit 130 for mixing high-temperature water and low-temperature water, a tapping water flow path 140, and a controller 200. .

  High temperature water supplied from a heat source machine or the like is input to each of the high temperature water flow paths 110a to 110c. Low temperature water supplied from a water supply or the like is input to each of the low temperature water flow paths 120a to 120c.

  The temperature sensor 190 is disposed so as to detect the temperature of the high-temperature water supplied to the high-temperature water flow paths 110a to 110c (hereinafter, high-temperature water temperature Th). The temperature sensor 191 is disposed so as to detect the temperature of the low temperature water (low temperature water temperature Tc) supplied to each of the low temperature water flow paths 120a to 120c.

  Mixing unit 130 has junctions 135 a to 135 c provided on hot water flow path 140. In the merge part 135a, the high temperature water flow path 110a and the low temperature water flow path 120a merge. Similarly, the high temperature water flow path 110b and the low temperature water flow path 120b merge at the merge part 135b, and the high temperature water flow path 110c and the low temperature water flow path 120c merge at the merge part 135c.

  Thus, about each of three systems, high temperature water and low temperature water are mixed in merge part 135a-135c. Hot water mixed with high-temperature water and low-temperature water is supplied from the hot water flow path 140 to the bathtub 50 via the pipe 52. Hereinafter, the output of hot water from the makeup water device 100 to the bathtub 50 is also referred to as “water supply” regardless of the temperature of the output hot water.

  The hot water flow path 140 is provided with a temperature sensor 192 for detecting the temperature after mixing high temperature water and low temperature water (water supply temperature To). The high temperature water temperature Th, the low temperature water temperature Tc, and the feed water temperature To detected by the temperature sensors 190 to 192 are input to the controller 200.

  The high temperature water flow paths 110a to 110c are provided with flow rate adjustment valves 160a to 160c for adjusting the flow rate of the high temperature water. The opening degree of the flow regulating valves 160a to 160c is controlled according to the valve opening degree commands S1a to S1c from the controller 200, respectively.

  Similarly, the low-temperature water flow paths 120a to 120c are respectively provided with flow rate adjusting valves 170a to 170c for adjusting the flow rate of the low-temperature water. The opening degree of the flow rate adjusting valves 170a to 170c is controlled according to the valve opening degree commands S2a to S2c from the controller 200, respectively.

  The flow rate adjustment valves 160a to 160c and 170a to 170c can be configured by, for example, electric servo valves. The opening degree of each of the flow rate adjusting valves 160a to 160c and 170a to 170c is variably set between the fully closed state and the maximum opening degree according to the valve opening degree commands S1a to S1c and S2a to S2c. That is, the flow rate adjusting valves 160a to 160c and 170a to 170c can be controlled by the controller 200 to a fully closed state in which the flow rate of the high-temperature water is blocked.

  Furthermore, electric on-off valves 150a to 150c are connected to the high-temperature water flow paths 110a to 110c in series with the flow rate adjusting valves 160a to 160c, respectively. The on-off valves 150a to 150c are controlled to one of an open state and a closed state (fully closed). The on-off valves 150a to 150c are of a so-called normally closed type that is closed when not energized, and is controlled to open when energized according to the open commands S3a to S3c from the controller 200. For example, the on-off valves 150a to 150c can be configured by electromagnetic valves that are opened by being excited in response to the opening commands S3a to S3c.

  On the other hand, an electric on-off valve is not arranged in the low-temperature water flow paths 120a to 120c, and the low-temperature water is supplied to the merging portions 135a to 135c without going through the electric on-off valve. In the low-temperature water flow paths 120a to 120c, flow rate sensors 180a to 180c are arranged in series with the flow rate adjustment valves 170a to 170c. The flow rate sensors 180a to 180c may be on / off detection sensors for determining whether low-temperature water is flowing, in addition to a quantitative sensor for detecting a flow rate value. Detection values Qca to Qcc from the flow sensors 180 a to 180 c are input to the controller 200.

  The filtration unit 60 is connected to the bathtub 50 via a pipe and configured to circulate and filter the hot water in the bathtub 50. The controller (not shown) of the filtration unit 60 is configured to be capable of bidirectional communication with the controller 200 of the makeup water device 100.

  The bathtub 50 is provided with a water level sensor 55 for detecting the bathtub water level. The water level sensor 55 is constituted by a pressure sensor, for example, and is configured to output an electrical signal corresponding to the bathtub water level. Or the water level sensor 55 may be comprised so that the electrical signal according to the bathtub water level may be output by the detection of the contact presence or absence of an electrode and a water surface. An output signal (electrical signal) from the water level sensor 55 is input to the controller 200 via a shield line or the like (not shown).

  A remote controller (hereinafter also simply referred to as “remote controller”) 210 receives a user command regarding the makeup water device 100. The remote controller 210 and the controller 200 are configured to be capable of bidirectional communication by wire or wireless. The controller 200 operates the make-up water device 100 in accordance with a user operation command input to the remote controller 210. The operation command includes an on / off command for water supply and a set temperature for the water supply.

  When the water supply ON command is input, the controller 200 controls the opening / closing valves 150a to 150c to be opened (specifically, outputs of the opening commands S3a to S3c), and the flow rate adjusting valves 160a to 160c and the flow rate adjusting valves 170a to 170a. The water supply operation to the bathtub 50 can be executed by controlling the opening degree of 170c.

  The controller 200 controls the ratio of the high-temperature water flow rate and the low-temperature water flow rate in each system, that is, the mixing ratio of high-temperature water and low-temperature water, depending on the opening degree of the flow rate adjustment valves 160a to 160c and the flow rate adjustment valves 170a to 170c. Can do. Therefore, during the water supply operation, the controller 200 adjusts the mixing ratio according to the comparison between the water supply temperature To detected by the temperature sensor 192 and the temperature set by the user, and the flow rate adjusting valves 160a to 160c and the flow rate adjusting valves 170a to 170a. 170c valve opening commands S1a to S1c and S2a to S2c are generated. Thereby, feed water temperature is controllable to target temperature.

  Further, the controller 200 can automatically control the stop of the water supply operation in accordance with the output signal of the water level sensor 55 in addition to the off command from the user. That is, when an off command from the user or the arrival of a predetermined reference water level by the water level sensor 55 is detected, the controller 200 controls closing of the on-off valves 150a to 150c (specifically, the open commands S3a to S3c). The water supply operation is stopped by controlling the flow rate adjusting valves 160a to 160c and 170a to 170c to a fully closed state.

  Or when it is set as the structure which arrange | positions a flow sensor in the hot water flow path 140 or the piping 52, it is also possible to control the automatic stop of water supply operation according to the integrated value of the detected flow volume by the said flow sensor.

  In addition, although the high temperature water flow path 110a-110c of three systems and the low temperature water flow path 120a-120c are arrange | positioned in the makeup water apparatus 100, since the structure of each system ac is the same, below, it is a high temperature water flow path. 110, the low temperature water flow path 120, the merging portion 135, the on-off valve 150, the flow rate adjusting valves 160 and 170, and the flow rate sensor 180, the subscripts a to c are abbreviated when collectively referring to a plurality of systems a to c. On the other hand, when distinguishing the systems a to c, the suffixes a to c are added.

  Note that a plurality of systems a to c can be basically controlled in common. However, it is also possible to perform control so that the water supply is stopped for the remaining systems while the hot water supply operation is performed only in a part of the systems in accordance with the water supply flow rate to the bathtub 50 and the like. For example, at the start of the water supply operation, water is supplied to all the systems, but when the water level rises and the reference water level approaches, water supply is performed using only a part of the system, thereby suppressing an excessive amount of water supply. it can.

  The electric flow rate adjusting valves 160 and 170 used in the makeup water device 100 lose the operating force for changing the valve opening when a power failure occurs and become a non-energized state. Will be maintained. For this reason, during a water supply operation or the like, if a power failure occurs when the flow rate adjustment valves 160 and 170 are not fully closed, it is difficult to reliably make the flow rate adjustment valves 160 and 170 fully closed.

  On the other hand, the on-off valve 150 is normally closed so that it is closed during a power failure. Therefore, when a power failure occurs, the flow path can be expected to be shut off by the on-off valve connected in series with the flow rate adjustment valve, even if the electric flow rate adjustment valve cannot be fully closed.

  FIG. 2 is a block diagram showing a configuration of a makeup water device 100 # shown as a comparative example to the present embodiment. FIG. 2 shows only a portion related to the arrangement of the on-off valve and the flow rate adjustment valve in the entire configuration of makeup water supply apparatus 100 #.

  Referring to FIG. 2, in the makeup water device 100 # of the comparative example, in addition to the on-off valves 150a to 150c in the high temperature water flow paths 110a to 110c, the flow rate adjustment valves 170a to 170c are connected in series in the low temperature water flow paths 120a to 120c. On-off valves 155a to 155c are arranged.

  The on-off valves 155a to 155c are configured as normally closed type electric on-off valves that are opened in response to an open command from the controller 200, similarly to the on-off valves 150a to 150c. The on-off valves 155a to 155c are basically controlled to open and close in common with the on-off valves 150a to 150c of the same system. Further, the flow rate adjustment valves 160 a to 160 c and 170 a to 170 c can be controlled in the same manner as described in the makeup water device 100.

  As described above, in the makeup water device 100 # of the comparative example, normally closed on-off valves 150 and 155 are arranged in both the high temperature water channel 110 and the low temperature water channel 120. Therefore, even if a power failure occurs when the flow rate adjustment valves 160 and 170 are not fully closed, such as during a hot water operation, the on-off valves 150 and 155 are closed to shut off both high-temperature water and low-temperature water. Can do. That is, when the on-off valves 150 and 155 are normal (when no open failure occurs), the water supply from the hot water flow path 140 can be completely stopped.

  However, the open / close valves 150 and 155 may cause a so-called open failure in which the open state is maintained even when the power is not supplied due to a mechanical mechanism failure or the like. When such an open failure occurs only in any of the on-off valves 150a to 150c arranged in the high-temperature water flow paths 110a to 110c, while the on-off valves 155a to 155c are all normal, While the supply of low-temperature water to the flow path 140 is completely shut off, only high-temperature water is supplied via the open / closed on-off valve, so that the high-temperature water is output from the hot water flow path 140 as it is. There is a risk.

  In addition, even if the supply of high-temperature water from the heat source unit is stopped in response to the occurrence of a power failure, the heated high-temperature water existing in the pipe between the heat source unit and the makeup water device 100 is supplied to the high-temperature water channel 110. It will be. Therefore, in the makeup water device 100 # of the comparative example, although there is a limited case where an open failure occurs in the on-off valve and the failure occurs only on the high temperature water flow path side, the high temperature water remains as it is in the bathtub 50. The situation of being output to cannot be completely avoided.

  Referring again to FIG. 1, in makeup water apparatus 100 according to the present embodiment, low-temperature water in low-temperature water flow path 120 does not pass through an electric on-off valve, but joins part 135 via flow rate adjustment valve 170. Flow into. That is, the makeup water device 100 is supplied with low-temperature water to the mixing unit 130 when a power failure occurs and the flow control valve 170 is not energized when the flow control valve 170 is not fully closed. It is comprised so that it may output from the hot water flow path 140. FIG.

  Therefore, in the make-up water device 100, when a power failure occurs during the hot water operation, that is, when the flow rate adjusting valves 160 and 170 are not fully closed, when each on-off valve 150 is normal (no open failure), the hot water flow Only low-temperature water is output from the path 140. On the other hand, even if an open failure occurs in any of the open / close valves 150a to 150c, the hot water supply channel 140 supplies the low-temperature water supplied from the low-temperature water flow channel 120 and the open / failed open / close valve 150. The hot water mixed with the high-temperature water is output.

  For this reason, according to the replenishing water device 100 according to the present embodiment, the open / close valve 150 can be opened and closed by arranging the normally closed electric open / close valve 150 only in the high-temperature water flow path. Even if it occurs, it is possible to avoid a situation in which the high temperature water is output to the hot water flow path 140 and the bathtub 50 as they are.

  Further, the controller 200 can detect whether or not each of the flow rate adjustment valves 170a to 170c is in a fully closed state based on the detected values Qca to Qcc by the flow rate sensors 180a to 180c.

  Further, the makeup water device 100 can diagnose whether or not an open failure has occurred in the on-off valve 150 by applying a diagnosis mode as described below.

  FIG. 3 is a flowchart illustrating a control process in a diagnosis mode for detecting an open failure of the on-off valve of the makeup water device according to the present embodiment. The control process shown in FIG. 3 can be executed by the controller 200, for example. Note that the diagnostic mode according to FIG. 3 can be executed in common for each of the systems a to c.

  Referring to FIG. 3, controller 200 determines in step S100 whether or not a diagnosis mode start request has been generated. Until the diagnosis mode start request is generated (NO in S100), the processes after step S110 are not started.

  When a request for starting the diagnosis mode is generated (when YES is determined in S100), controller 200 advances the process to step S110. In step S110, the output of the opening command S3 (S3a to S3c) to the on-off valve 150 is stopped, so that the on-off valve 150 is controlled to close, and the flow rate adjusting valves 160, 170 are controlled to a predetermined opening degree. The valve opening commands S1 (S1a to S1c) and S2 (S2a to S2c) are generated. For example, in step S110, the flow rate adjusting valves 160 and 170 can be controlled to a predetermined minimum opening that can maintain the flow rate at a constant amount.

  The controller 200 maintains the state of the on-off valve 150 and the flow rate adjustment valves 160 and 170 in step S110, and the feed water temperature To is changed from the low temperature water temperature Tc by using the detected values of the temperature sensors 190 and 192 in step S120. Determine if it is rising. For example, the determination in step S120 can be determined by whether or not To> Tc + α (α: constant) is satisfied. α is a predetermined constant for determination, and can be set to about α = 5 ° C., for example.

  As described above, when an open failure has not occurred in the on-off valve 150, the high-temperature water flow path is blocked, so that the low-temperature water is output to the hot water flow path 140 as it is. Therefore, when an increase in the feed water temperature To is detected (when YES is determined in S120), the controller 200 proceeds to step S130 and detects an open failure of the on-off valve 150. For example, in step S <b> 130, an alarm for notifying an open failure of the on-off valve 150 is generated for the user. Furthermore, the controller 200 ends the diagnostic mode in step S150.

  On the other hand, when an increase in the feed water temperature To is not detected (NO determination in S120), the controller 200 determines whether or not this state continues for a predetermined time Ttst in step S140.

  The controller 200 repeatedly executes the determination in step S120 until the predetermined time Ttst elapses (NO determination in S140). If To> Tc + α is established before the predetermined time Ttst elapses (YES in S120), the process proceeds to step S130, and an open failure of the on-off valve 150 is detected.

  If the state of To ≦ Tc + α (when NO is determined in S120) continues for a predetermined time Ttst (when YES is determined in S140), the controller 200 skips step S130 and proceeds to step S150 to end the diagnosis mode. . That is, the diagnostic mode is terminated without detecting an open failure of the on-off valve 150. When the diagnostic mode is terminated in step S150, the process returns to step S100 in order to wait for the next diagnostic mode start request to be generated.

  As described above, according to the replenishing water device according to the present embodiment, by devising the arrangement of the normally closed type electric on-off valve, the hot water is discharged as it is regardless of the open failure of any on-off valve. It is possible to realize a highly safe configuration in which the possibility of excessive temperature rise due to output from the flow path is suppressed. Furthermore, it is possible to realize a diagnostic mode for automatically detecting the occurrence of an open failure of the on-off valve.

  In the configuration example of FIG. 1, the flow rate adjustment valves 160 a to 160 correspond to one example of “first flow rate adjustment valve”, and the flow rate adjustment valves 170 a to 170 are one example of “second flow rate adjustment valve”. Corresponds to the example. The temperature sensor 191 corresponds to a “first temperature detector”, and the temperature sensor 192 corresponds to an example of a “second temperature detector”. The controller 200 corresponds to a “control device”.

  However, in the diagnosis mode shown in FIG. 3, control processing can be executed in common for the on-off valves 150 a to 150 c of each system, while specifying which on-off valve 150 has failed. I can't.

  Therefore, in the makeup water apparatus having a plurality of systems as shown in FIG. 1, the diagnosis mode of the on-off valve can be modified so as to sequentially select the systems to be diagnosed.

  FIG. 4 is a flowchart for illustrating a control process of a modified example of the on-off valve diagnosis mode in the makeup water apparatus according to the present embodiment. The control process shown in FIG. 4 can also be executed by the controller 200.

  Referring to FIG. 4, when a diagnosis mode start request is generated (YES in S100), controller 200 reads one of the plurality of systems by reading the diagnosis target code in step S105. Select the strain to be diagnosed. For example, the diagnosis target code can be composed of 2-bit data for designating one of the systems a to c (high-temperature water flow paths 110a to 110c) in FIG.

  In step S107, the controller 200 controls the on / off valve 150 to be closed and controls the flow rate adjusting valves 160 and 170 to a fully closed state in a system other than the diagnosis target. For example, when the system a (hot water channel 110a) is a diagnosis target, the on-off valves 150b and 150c are controlled to close in the high temperature water channels 110b and 110c of the systems b and c (open commands S3b and S3c are not generated). In addition, the valve opening commands S1b, S1c, S2b, and S2c are generated so that the flow rate adjusting valves 160b, 160c, 170b, and 170c are controlled to be fully closed.

  Further, in step S110, the controller 200 controls the on-off valve 150 and the flow rate adjusting valves 160 and 170 in the system to be diagnosed as in step S110 of FIG. That is, when the system a (the high-temperature water channel 110a) is a diagnosis target, the on-off valve 150a is controlled to be closed in the high-temperature water channel 110a, and the flow rate adjustment valves 160a and 170a are at the minimum opening degree. Valve opening commands S1a and S2a are generated.

  In the state in which the on-off valves 150a to 150c and the flow rate adjusting valves 160a to 160c and 170a to 170c are controlled according to steps S107 and S110, the controller 200 performs the water supply temperature To and the low-temperature water temperature by steps S120 to S140 similar to FIG. Based on the comparison of Tc, it is diagnosed whether an open failure has occurred in the on-off valve 150a of the system to be diagnosed.

  The controller 200 updates the diagnosis target code in step S145 when the diagnosis mode can be ended by the YES determination in step S120 or the YES determination in step S140. Thereby, the contents of the diagnosis target code are changed so as to designate a system different from the diagnosis mode. For example, in step S145, the diagnosis target code is updated so that the on-off valve 150b becomes the diagnosis target next to the on-off valve 150a. After updating the diagnosis target code, the controller 200 can end the diagnosis mode in step S150 similar to FIG. In the next diagnosis mode, the updated diagnosis object code is read (S107), and the on-off valve 150b of the system b is set as the diagnosis object.

  According to the diagnostic mode according to the modified example of FIG. 4, since the presence or absence of an open failure is diagnosed using one on-off valve of a plurality of systems as a diagnosis target, the target on-off valve can be specified when an open failure is detected. . In addition, by sequentially updating the diagnosis target code, it is possible to sequentially diagnose whether or not an open / close valve open failure has occurred for a plurality of systems.

Next, the execution timing of the diagnostic mode will be described using FIG. 5 and FIG.
FIG. 5 is a flowchart illustrating a first example of start-up control in the on / off valve diagnostic mode in the makeup water supply device according to the present embodiment.

  Referring to FIG. 5, when the water supply request is turned on (when YES is determined in S200), controller 200 advances the process to step S310 to generate a diagnosis mode start request. The water supply request is generated, for example, when the user inputs ON of the water supply operation to the remote controller 210. Alternatively, the water supply request may be automatically generated based on the output signal of the water level sensor 55 when a drop in the bathtub water level is detected.

  When the diagnosis mode start request is generated (S310), the determination of YES in step S100 in FIG. 3 or FIG. 4 makes it possible to diagnose the open failure of the on-off valve 150. The controller 200 waits for execution of the water supply operation until the diagnosis mode ends in step S320. Step S320 is determined as YES when the diagnosis mode is ended by step S150 in FIG. 3 or FIG. 4, while it is determined as NO until then.

  When the diagnosis mode ends (when YES is determined in S320), the controller 200 executes the water supply operation in step S210. In the water supply operation, open commands S3a to S3c are generated in order to control the opening / closing of the on-off valves 150a to 150c. Furthermore, the flow rate adjusting valves 160a to 160c and 170a to 170c are opened, and the opening degree is controlled, so that the hot water with the appropriate temperature mixed with the high temperature water and the low temperature water is controlled in accordance with the target temperature. 50.

  The controller 200 continues the water supply operation (S210) until the water supply request is turned off (NO in S220). When the water supply request is turned off (YES in S220), the controller 200 advances the process to step S230 and ends the water supply operation. At the end of the water supply operation, each on-off valve 150 is closed, and each flow rate adjustment valve 160, 170 is controlled to a fully closed state.

  The water supply request can be turned off based on a user operation on the remote controller 210 or an increase in the bathtub water level detected by the water level sensor 55. Alternatively, the water supply request can be turned off based on the integrated flow rate value by the flow rate sensor arranged in the hot water flow path 140.

  According to the control process shown in FIG. 5, since the failure diagnosis of the on-off valve 150 can be executed at the start of the water supply operation, it is possible to start the water supply operation after confirming that no open failure has occurred in the on-off valve 150. it can.

  FIG. 6 is a flowchart illustrating a second example of start-up control in the open / close valve diagnostic mode in the makeup water supply device according to the present embodiment.

  Referring to FIG. 6, controller 200 executes a water supply operation in response to the water supply request being turned on in steps S <b> 200 to S <b> 220 similar to FIG. 5. Furthermore, when the water supply request is turned off (YES in S220), the controller 200 proceeds to step S310 to generate a diagnosis mode start request. Thereby, in FIG. 3 or FIG. 4, the diagnosis of the open failure of the on-off valve 150 is executed by making a determination of YES in step S100. The controller 200 stands by for processing until the diagnosis mode ends (NO determination in S320). When the diagnosis mode ends (when YES is determined in S320), the controller 200 ends the water supply operation in step S230.

  In the control process shown in FIG. 6, the diagnostic mode of the on-off valve 150 is executed at the end of the water supply operation. At the end of the water supply operation, there is a low possibility that low-temperature water remains in the pipe between the heat source device and the high-temperature water flow path 110. Therefore, when an open failure has occurred in the on-off valve 150, it can be expected that high-temperature water is reliably output to the hot water flow path 140 via the open-failure on-off valve 150. Therefore, it is possible to prevent the detection failure of the open failure in the failure diagnosis mode of the on-off valve 150.

  As described above, in the makeup water device 100 according to the present embodiment, the diagnosis mode start request shown in FIG. 3 or 4 is issued at the start or end of the water supply operation according to FIG. 5 and / or FIG. Can be generated both at the start and at the end.

  Although FIG. 1 shows a configuration example in which three high-temperature water flow paths and low-temperature water flow paths are provided, the makeup water device according to the present embodiment is not limited to the number of lines by the low-temperature water flow paths and the high-temperature water flow paths. Can be configured. That is, the number of low-temperature water flow paths and high-temperature water flow paths may be singular, or may be two or a plurality of four or more. Similarly, the configuration according to the present embodiment and the on-off valve failure diagnosis are applied. It is possible to constitute a makeup water device.

  Moreover, in this Embodiment, the water supply destination of the makeup water apparatus 100 was made into the bathtub, However, The makeup water apparatus according to this Embodiment can be applied in common to the water supply to water tanks, such as a pool, besides a bathtub. .

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  5 Hot Water Supply System, 50 Bathtub, 52 Piping, 55 Water Level Sensor, 60 Filtration Unit, 100 Makeup Water Device, 110a to 110c High Temperature Water Channel, 120a to 120c Low Temperature Water Channel, 130 Mixing Unit, 135a to 135c Merge Portion, 140 Hot Water Flow Road, 150a to 150c, 155a to 155c On-off valve, 160a to 160c, 170a to 170c Flow rate adjustment valve, 180a to 180c Flow rate sensor, 190 to 192 Temperature sensor, 200 controller, 210 Remote control, Qca to Qcc Detection value (flow rate sensor) , S1a to S1c, S2a to S2c Valve opening command (flow rate adjusting valve), S3a to S3c open command, Tc low temperature water temperature, Th high temperature water temperature, To feed water temperature.

Claims (5)

A makeup water device for supplying water to a tank,
A high-temperature water flow path for passing high-temperature water;
A low-temperature water flow path for passing low-temperature water having a temperature lower than that of the high-temperature water;
The high temperature water and the low temperature water mixing unit connected to the high temperature water channel and the low temperature water channel,
A hot water flow path for outputting hot water mixed by the mixing section toward the water tank,
An electric first flow regulating valve disposed in the high-temperature water flow path;
An electric second flow rate adjusting valve disposed in the low-temperature water flow path;
An electrically operated on-off valve connected in series with the first flow rate regulating valve in the high-temperature water flow path;
A control device for controlling the opening and closing of the on-off valve and the opening of the first and second flow rate regulating valves,
The on-off valve is configured to be opened when energized while being closed when de-energized,
The low-temperature water flow path is configured such that the low-temperature water flows into the mixing unit without going through an electric on-off valve,
In the replenishing water device, during the water supply operation for outputting the hot water from the hot water flow path, the control device controls the opening and closing of the on-off valve and controls the first and second flow rate adjusting valves to be in an open state. If a power failure occurs while the valve is open, the on-off valve is closed and closed, the first and second flow control valves are maintained at the opening when the power failure occurs, and the low-temperature water is supplied to the mixing unit. A make-up water device configured to be supplied and output from the hot water flow path. A first temperature detector for detecting a temperature of the low-temperature water flowing through the low-temperature water flow path;
A second temperature detector for detecting the temperature of the hot water flowing through the hot water flow path;
The control device has a diagnostic mode for controlling the opening and closing of the on-off valve and controlling the first and second flow rate regulating valves to an open state, and in the diagnostic mode, detection by the second temperature detector. The makeup water apparatus according to claim 1, wherein when the temperature is higher than a temperature detected by the first temperature detector, a failure in which the on-off valve is fixed in an open state is detected.   The diagnostic mode is executed before the start of a water supply operation for controlling the opening and closing of the on-off valve and controlling the first and second flow rate regulating valves to be in an open state and outputting the hot water from the hot water flow path. The makeup water device according to claim 2.   The diagnosis mode is executed at the end of a water supply operation in which the on-off valve is controlled to be opened and the first and second flow rate regulating valves are controlled to be opened to output the hot water from the hot water flow path. Item 3. A makeup water device according to item 2. A plurality of the high-temperature water flow paths having the first flow rate adjustment valve and the on-off valve and the low-temperature water flow paths having the second flow rate adjustment valve are disposed,
The control device sequentially selects one of the plurality of high-temperature water flow paths as a diagnosis target every time the diagnosis mode is executed, and controls closing of the on-off valve in the high-temperature water flow path of the diagnosis target. The first flow rate adjustment valve is controlled to be in an open state, while the on-off valve is controlled to be closed in the high-temperature water flow path excluding the diagnosis target, and the first flow rate adjustment valve is controlled to be in a fully closed state. The replenishment water apparatus of any one of -4.

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