JP2018162918A - Mixed hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the occurrence of a situation such as propagation of bacteria in retained water in supply passages due to the prolongation of a closed state, in a mixed hot water supply device which mixes high-temperature water and low-temperature water, and taps to a bathtub by switching and controlling a plurality of high-temperature water supply passages and a plurality of low-temperature water supply passages selectively to an open state.SOLUTION: A closing time counter is provided in each of mixture systems 8,9 which comprise a pair of high-temperature water supply passage 8 and low-temperature water supply passage 9, and the passage of time from the start of a closed state is counted. An open state is made by selecting the mixture system of a maximum count value (closing time). When a prescribed set circulation time passes or a prescribed set tapping amount is tapped after the open state is made, the closing time counter is reset, and with the reset, the mixture systems 8,9 in the open state are closed, and instead, the mixture systems 8,9 of a maximum closing time at that time are selected so as to switch to the open state.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a hot and cold water supply apparatus for adjusting the temperature by mixing low temperature water with high temperature water supplied from a separate heat source device such as a connected hot water supply system so that the hot water is discharged to a bathtub or the like.

  Conventionally, it is known to supply hot water whose temperature has been adjusted in advance to a bathtub. For example, in Patent Document 1 below, the temperature of the hot spring of the source spring assembled from the hot spring resort is adjusted by a water temperature adjustment device, and the hot water after the temperature adjustment is supplied to each of the hot spring bathtubs of a plurality of private rooms by the hot spring supply device. It is described. As such a water temperature adjusting device, a liquid-liquid heat exchanger configured to reduce a high-temperature source to a predetermined temperature by performing liquid-liquid heat exchange with water is described (paragraph 0040 of the same document). -0041, see FIG.

JP 2009-30881 A

  By the way, in order to supply hot water of a predetermined temperature to a large bathtub in a bathhouse facility such as a public bath, the temperature is adjusted to a predetermined temperature by mixing high-temperature water and low-temperature water at a predetermined flow rate ratio (hereinafter referred to as “temperature control”). A hot water / water mixing hot water supply apparatus that employs the configuration of the above is conceivable. In such a hot and cold water supply system, when the high-temperature water supply path and the low-temperature water supply path are merged so that the flow rate can be adjusted respectively, a plurality of high temperatures arranged in parallel so that the downstream end merges with the hot water supply path to the bathtub And a plurality of low-temperature water supply channels arranged in parallel so that the downstream ends of the hot water supply channels join together. A supply method in which the supply path is opened to supply hot water at a predetermined temperature, and after hot water filling, only one of the high-temperature water supply path and the low-temperature water supply path is opened, and a certain amount of hot water supply is continued. Conceivable.

  However, there is a possibility of occurrence of problems such as accumulation of stagnant water in the plurality of high-temperature water supply paths and the plurality of low-temperature water supply paths during the closed state, and concern about the growth of bacteria if the closed state is prolonged. is assumed.

  Then, an object of this invention is to provide the hot-water mixed hot-water supply apparatus which can eliminate the possibility of the said malfunction occurrence.

  In order to achieve the above object, the following technical measures were taken.

  That is, the first invention is directed to a hot / cold hot water supply apparatus configured to discharge hot water mixed with high-temperature water and low-temperature water to a hot water outlet, and the downstream end joins the hot water outlet in parallel. A plurality of high-temperature water supply passages configured to supply high-temperature water so that they can be switched open and closed independently of each other, and arranged in parallel so that their downstream ends merge with the tap water passage and can be switched open and closed independently of each other A plurality of low-temperature water supply paths configured to supply low-temperature water, and an open / close switching control unit for performing open / close switching control on each of the plurality of high-temperature water supply paths and the plurality of low-temperature water supply paths, As the control unit, for each of the high temperature water supply paths and for each of the low temperature water supply paths, a closed time counter for measuring the elapsed time from the start time of the closed state is provided, and selected from the plurality of high temperature water supply paths Some hot water The mixture mixed by switching a part of the low-temperature water supply path selected from the path and the plurality of low-temperature water supply paths to an open state while the remaining high-temperature water supply path and the low-temperature water supply path are closed. When hot water is discharged, the high-temperature water supply path and the low-temperature water supply path, each of which has the maximum value of the closing time counter at the time of switching to the open state, are selected and controlled to switch from the closed state to the open state. (Claim 1).

  According to the hot and cold water supply apparatus of the present invention, the value of the closing time counter is the maximum value among the plurality of high temperature water supply paths, and the value of the closing time counter is the value of the plurality of low temperature water supply paths. Each of the maximum value low-temperature water supply paths can be selected and switched to the open state. In other words, since the high temperature water supply path and the low temperature water supply path that have the maximum closing time are selected as the objects to be newly switched to the open state, the closed state continues for a long time, so It is possible to reliably prevent the occurrence of inconveniences such as bacterial growth.

  2nd invention is arrange | positioned so that a downstream end may join the said hot water path for the hot water mixed hot water supply apparatus comprised so that the hot water mixed with high temperature water and low temperature water might be discharged to a hot water path. A high-temperature water supply path configured to supply high-temperature water so that it can be switched open and close, and a low-temperature water supply path configured to supply low-temperature water so that the downstream end is joined to the outlet channel and can be switched open and closed Provided with a plurality of paired mixed systems, each having a switching control unit for switching control of the plurality of mixed systems, and as the switching control unit, time elapsed from the start time of the closed state for each mixed system A closed time counter for measuring the mixed system, and switching a part of the mixed systems selected from the plurality of mixed systems to an open state, while bringing the remaining mixed systems to a closed state, Make If, is characterized in that the value of the open state to the closed time counter at the time the switch is switching control in an open state mixed lineage from selected and closed state of the maximum value (claim 2).

  According to the hot and cold water mixing apparatus of the present invention, the mixing system paired in the high temperature water supply path and the low temperature water supply path is the target of the open / close switching control, and the closing time up to that time is the maximum as the target to be newly switched to the open state. Since the mixed line is selected, it is possible to reliably prevent the occurrence of inconveniences such as the propagation of bacteria in the internal staying water due to the prolonged closed state.

  When the closing time counter is provided, the opening / closing switching control unit is configured to reset the closing time counter when a predetermined set circulation time has elapsed after switching control from the closed state to the open state based on the closing time counter. be able to. If a predetermined time (set distribution time) elapses in the open state, the target to be opened is changed to another one. Alternatively, a hot water amount detection means for detecting the amount of hot water passing through the hot water passage is provided, and the open / close switching control unit is controlled to switch from the closed state to the open state based on the closing time counter, and then predetermined by the hot water amount detection means. If the amount of discharged hot water exceeding the set amount of discharged hot water is detected, the closing time counter can be reset. That is, if there is a predetermined amount (set hot water amount) of hot water after switching to the open state, the target to be opened is changed to another.

  Further, the opening / closing switching control unit may be configured to execute switching control for changing the target to be opened when the closing time counter is reset. In this case, the role of the closing time counter can be a selection criterion for switching to the open state depending on the length of the count value (closing time), and the open state target is set to the closed state by the reset timing of the closing time counter. The timing for switching another object to the open state can be set.

  As the hot / cold hot water supply apparatus of the present invention, each high-temperature water supply path and each low-temperature water supply path are provided with a control valve for making the supply flow variable and open / close-switchable, and are opened. A temperature adjustment control unit for controlling both the control valves of the passage and the low-temperature water supply passage so that the temperature of the mixed hot water becomes the set hot water temperature may be provided. In this case, a flow rate control valve may be provided as the control valve, and the temperature of the mixed water may be adjusted by adjusting the mixing ratio of the high temperature water and the low temperature water by adjusting the opening of the flow rate control valve.

According to the hot water / mixed hot water supply apparatus according to the first aspect of the invention, the high temperature water supply path having the maximum closed time counter value from among the plurality of high temperature water supply paths and the closed time counter from among the plurality of low temperature water supply paths. The low temperature water supply channel with the maximum value is selected and switched to the open state, so that the closed state continues for a long time, causing inconveniences such as bacteria growing in the accumulated water inside The possibility of occurrence can be reliably prevented.
In addition, according to the hot and cold water supply apparatus according to the second aspect of the present invention, the mixing system paired by the high temperature water supply path and the low temperature water supply path is set as the object of the open / close switching control, and is newly switched to the open state until then. Since the mixed line having the maximum closing time is selected, it is possible to surely prevent the occurrence of inconveniences such as the propagation of bacteria in the accumulated water within the closed state for a long time.

It is a schematic diagram which shows the example of the bathhouse system to which the hot-water mixed hot-water supply apparatus which concerns on one Embodiment of this invention is applied. It is a schematic diagram which shows the example of a hot-water mixing hot-water supply apparatus. It is a flowchart which shows the example of closing time count control. It is a flowchart which shows the example of opening / closing switching control. It is a flowchart which shows the example of different closed time count control from FIG.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  FIG. 1 shows an example of a bathhouse system to which a hot and cold water mixing apparatus 1 according to an embodiment of the present invention is applied. This bathing system is configured to supply hot water (supplement) to the bathtub 2 using hot water mixed at a predetermined set temperature discharged from the hot / cold hot water supply apparatus 1 as bath water, and filter the hot water in the bathtub 2 with the filter 3. Has been. The bathtub 2 in such a bathhouse system is intended for a relatively large bathtub such as a hot spring facility or a public bath. The filtration device 3 filters the bath water in the bathtub 2 by taking the bath water in the bathtub 2 through the filter tank 32 by operating the circulation pump 31 at all times or during a predetermined time period during business hours. A circulation operation of returning to the bathtub 2 is performed. By passing it through a hair catcher (not shown) before filtration, the hair contained in the bath water can be collected in advance. In addition, the filtered hot water can be returned to the bathtub 2 after being heated to a predetermined temperature by, for example, a liquid-liquid heat exchanger.

  The hot water / mixed hot water supply apparatus 1 includes high temperature water supplied from a large boiler or heat source apparatus (for example, a connected hot water supply apparatus formed by connecting a plurality of water heaters) 4 and a water source such as a water supply. The supplied low-temperature water (normal temperature non-heated water, etc.) is mixed with a predetermined ratio in the hot and cold water supply apparatus 1 to adjust the temperature to the set temperature, and the mixed hot water after mixing is discharged to the bathtub 2. ing. Hereinafter, it will be described in detail with reference to FIG.

  The hot water mixing hot water supply apparatus 1 includes a hot water supply path 5 for discharging hot mixed water obtained by mixing high temperature water and low temperature water, a hot water supply path 6 for supplying high temperature water of, for example, 80 ° C. from a heat source unit 4, and the like. For example, a plurality of (three in the illustrated example) high-temperature water supply channels 8 and 8 provided in parallel between the water inlet 7 to which low-temperature water of, for example, 20 ° C. is supplied from the water source, and the hot-water channel 6 and the hot water channel 5. , 8 and a plurality of (three in the illustrated example) low-temperature water supply paths 9, 9, 9 provided in parallel between the water inlet path 7 and the hot water path 5.

  The hot water supply path 5 is provided with three mixing portions 51, 51, 51 spaced apart in the tube axis direction, and one high temperature water supply path 8 and one low temperature water supply path for each mixing portion 51. 9 are connected so that their downstream ends meet. The high temperature water supply path 8 and the low temperature water supply path 9 connected to each mixing part 51 are provided so as to confront each other in the diametrical direction of the tap water path 5 and are supplied from the supply pipes 6 and 7. The high-temperature water and low-temperature water to be collided in the mixing unit 51 are stirred and mixed. In this way, one high-temperature water supply path 8 and one low-temperature water supply path 9 are paired with the mixing unit 51 interposed therebetween to form one mixing system. In this embodiment, the high-temperature water supply path 8 and the low-temperature water are combined. An example in which three pairs of supply paths 9 (three mixed systems) are provided is shown. In addition, the code | symbol 5a of FIG. 2 is a tapping connection pipe, and this tapping connection pipe 5a was connected so that the upstream end might be connected to the downstream end of the tapping channel 5 via a connection port, and a downstream end might be extended to the bathtub 2. Is.

  Each hot water supply path 8 connects the hot water path 6 and the hot water path 5 so that the high temperature water in the hot water path 6 is supplied to the hot water path 5 by the hot water supply pressure from the heat source machine 4 or the like. Note that the heat source unit 4 or the like may supply high-temperature water using the water supply pressure of the water source.

  Each low-temperature water supply channel 9 connects the water inlet channel 7 and the hot water channel 5 so that the low-temperature water in the water channel 7 is supplied to the hot water channel 5 by the water supply pressure of the water source. In addition, pressure reducing valves 61 and 71 for adjusting hot water supply pressure and water supply pressure and check valves 62 and 72 for preventing backflow are provided on the connection port side at the upstream end of the hot water passage 6 and the water inlet passage 7. Can do.

  In addition, the pipe diameter (bore diameter) of the hot water path 5 is larger than each pipe diameter of the hot water path 6 and the water path 7, for example, is about twice as large as the cross-sectional area of the flow path. The pipe diameter of the hot water path 6 and the pipe diameter of the water path 7 are made equal. Moreover, the pipe diameter of each high temperature water supply path 8 and each low temperature water supply path 9 is smaller than the pipe diameter of the hot water path 6 and the water path 7, and these supply paths 8 and 9 are comprised by comparatively small diameter piping. Yes. For example, the pipe diameters of the supply passages 8 and 9 can be set to the same pipe diameter as that of a pipe used in a general domestic instantaneous water heater.

  Each high-temperature water supply path 8 is provided with a flow control valve 81 and an electromagnetic on-off valve 82 in series. In the embodiment, the electromagnetic open / close valve 82 is disposed on the upstream side (the hot water passage 6 side), and the flow control valve 81 is disposed on the downstream side (the hot water passage 5 side). The flow rate control valve 81 and the electromagnetic opening / closing valve 82 constitute a control valve for switching the hot water supply path 8 between opening and closing. On the other hand, each low temperature water supply path 9 is provided with a flow rate control valve 91 (control valve) and a flow rate sensor 92 that constitute a control valve for switching the low temperature water supply path 9 to open and close. The flow sensor 92 is disposed at an upstream position of the flow control valve 91. These flow control valves 81 and 91 and the electromagnetic on-off valve 82 are connected by wiring so that their operation is controlled by the control unit 10 based on setting signals, command signals, etc. from the remote controller 101 or the like.

  The flow control valves 81 and 91 are each configured to be able to adjust the opening degree from fully closed to fully open by driving a valve shaft (not shown) by a stepping motor that is driven and controlled by the control unit 10. That is, the flow control valves 81 and 91 are configured to have a fully-closed function capable of completely closing the supply passages 8 and 9 and blocking the flow in addition to the flow rate control function by opening degree adjustment. In addition, since the electromagnetic on-off valve 82 is provided on the high temperature water supply path 8 side, a flow rate control valve that does not have a fully-closed function can be provided. Since the temperature of the high-temperature water flowing through the high-temperature water supply path 8 is relatively high (for example, 80 ° C.), by providing the flow control valve 81 with a fully-closed function in addition to the electromagnetic on-off valve 82, the electromagnetic on-off valve 82 should malfunction. In this case, it is possible to switch the fully closed state so that the high temperature water can be prevented from flowing out downstream.

  The reason why the flow rate sensor 92 is provided on the side of the low temperature water supply path 9 is that the temperature of the high temperature water supplied to the mixing section 51 by the high temperature water supply path 9 is relatively high as described above, When mixing hot water with hot water and low temperature water, first flow low temperature water from the low temperature water supply path 9 and confirm that the low temperature water is flowing by detecting the flow rate from the flow sensor 92 and then supplying the high temperature water. This is because high-temperature water is allowed to flow from the path 8, and under such circumstances, the flow rate sensor 92 detects and confirms that low-temperature water is flowing. For this reason, it can replace with the flow sensor 92 and a water flow switch etc. can be used. Furthermore, instead of the flow control valve 91 with a fully closed function, a combination of a flow control valve and an electromagnetic on-off valve that does not have a fully closed function can be provided for the low-temperature water supply path 9.

  The tap water passage 5 is provided with a tap water temperature sensor 52 at a position downstream of the three mixing portions 51, 51, 51. The temperature of the mixed hot water flowing through the tap water passage 5 is detected and the detected value is controlled. It outputs to the part 10. The hot water supply path 6 is provided with a hot water temperature sensor 63 at a position upstream from the branch position of the high temperature water supply paths 8, 8, 8, and detects the temperature of the high temperature water flowing through the hot water path 6. The detected value is output to the control unit 10. Further, the inlet water path 7 is provided with an incoming water temperature sensor 73 at a position upstream of the branch position of the low temperature water supply paths 9, 9, 9, and detects the temperature of the low temperature water flowing through the inlet water path 7, The detected value is output to the control unit 10.

  In addition, the code | symbol 53 in FIG. 2 is a bending part for further raising the mixing degree of the mixing warm water after mixing, and mixing uniformly. When such a bent portion 53 or other means for mixing is positively provided, the downstream ends of the high temperature water supply path 8 and the low temperature water supply path 9 are opposed to each other with the mixing section 51 interposed therebetween as described above. You may make it just make it join the tap line 5 without making it do.

  The control unit 10 is mainly composed of a microcomputer, and executes various controls based on a predetermined program stored in advance. The control unit 10 is connected to a communication circuit (not shown) for performing communication using a predetermined communication protocol. Via this communication circuit, in addition to the remote controller 101, it can be communicably connected to a control unit (for example, the control unit 33 of the filtration device 3 or the remote controller 34; see FIG. 1) corresponding to the communication protocol. . As such a communication circuit, for example, a two-core communication circuit that supplies serial power and superimposes communication data on a power supply voltage to perform serial communication can be configured.

  A water level sensor 21 is attached to the bathtub 2, and the water level detection value of the bath water detected by the water level sensor 21 can be output to the control unit 10. As the water level sensor 21, an appropriate detection method such as a pressure type or a water level electrode type can be adopted.

  The remote controller 101 includes a display unit and various operation units. By a user input operation to the remote controller 101, a replenishment operation start / stop operation for discharging mixed hot water to replenish the bathtub 2 and replenishment operation reservation Various operations such as a setting operation, a setting operation of a hot water temperature to the bathtub 2 and a hot water operation to the bathtub 2 can be performed.

  The control unit 10 switches between opening and closing the control valves (the flow control valve 81, the electromagnetic open / close valve 82, and the flow control valve 91) of each mixing system (8, 9) for the replenishment operation and the filling operation. An open / close switching control unit that performs control and a temperature control unit that performs temperature control are provided. Here, the high-temperature water supplied from the heat source unit 4 or the like to the hot water passage 6 has a relatively high temperature (for example, 60 to 80 ° C.) so that mixing with low-temperature water is necessary in consideration of the set hot water temperature. When the hot water filling operation and the replenishment operation are performed, both the high temperature water supply path 8 and the low temperature water supply path 9 are opened. In addition, during the hot water filling operation, all of the three mixing systems (8, 9, 8, 9, 8, 9) are opened, and the mixed hot water adjusted to the set hot water temperature is supplied with a large flow rate (for example, 3 The total amount of the system is supplied to the bathtub 2 at a maximum flow rate of 120 L / min) and is filled with water up to a predetermined water level. In the replenishment operation after the completion of the hot water filling, any one of the three mixed systems (8, 9) is opened, and the hot water adjusted to the set hot water temperature is continuously supplied to the inside of the bathtub 2 The hot water of the surface layer is overflowed, or the mixed hot water is intermittently supplied based on the water level monitoring by the water level sensor 21 so that the water level of the bathtub is kept constant.

  The replenishment operation is started when one of the mixed systems (8, 9) is switched to the open state by the control unit 10 by the operation start operation of the remote controller 101 by the user or the arrival of the time when the operation start is reserved. On the other hand, all the mixed systems (8, 9, 8, 9, 8, 9) are closed by the control unit 10 due to the operation stop operation of the remote controller 101 or the arrival of the time when the operation stop is reserved. It is switched to and stopped.

  In this embodiment, the replenishment operation is performed with one mixed system (8, 9) selected from among the three mixed systems (8, 9, 8, 9, 8, 9) opened, while in the closed state. In order to prevent the closed state from continuing for a long time while stagnant water remains in the interior, the mixed systems (8, 9) to be opened can be sequentially switched every predetermined time. For this purpose, each mixed system (8, 9) is provided with a closed time counter for counting the time during which the mixed system (8, 9) is closed (closed time). Based on the count value (close time) of the closed time counter, the target to be opened next is selected and determined from other mixed systems (8, 9, 8, 9) that have been closed until then. Open / close switching control is executed. As a selection criterion, the mixed system (8, 9) having the longest closing time by the closing time counter is selected as an object to be next switched to the open state.

  For example, a timer / counter built in the control unit 10 can be used as the closing time counter, and the mixed system (8, 9) is based on a control signal that is controlled to be switched from the open state to the closed state by the open / close switching control. The counting of the closing time is started, and is reset when a predetermined condition is satisfied as described below. Such a closed time counter is provided for each mixed system (8, 9) to be monitored. In the present embodiment, three are provided, and closed time count control is executed by the closed time count control unit.

  Hereinafter, the closed time count control of each closed time counter will be described with reference to FIG. First, if the corresponding mixed system (8, 9) is switched to the closed state based on the switching control signal to the closed state (YES in step S1), it is assigned to the mixed system (8, 9). The count of the closing time counter is started (step S2). As long as the closed state is maintained (YES in step S1), the counting of the closing time is continued (step S2).

  On the other hand, when the closed state is switched to the open state (NO in step S1), the open state is maintained until a predetermined set circulation time has elapsed (NO in step S3). The set circulation time is another mixed system (8, 9, 8, 9) that is in a closed state while continuing the hot water supply (circulation) of the mixed warm water by the mixed system (8, 9) that is controlled to be switched to the open state. The shortest elapsed time (for example, 24 hours) is set so that there is no inconvenience such as the propagation of bacteria due to the hot water staying inside.

  And if the time more than setting distribution time passes in an open state (it is NO at step S1, YES at S3), a closing time counter is reset (count value is returned to zero), and also elapse of setting distribution time The open time counter for counting is also stopped and reset (step S4).

  Based on the count of the closing time by the above closing time count control, the opening / closing switching control by the opening / closing switching control unit first has a request for starting the replenishment operation or the like as shown in FIG. 4 (YES in step S11). The mixed system (8, 9) having the maximum closing time counted by the closing time counter is selected, and the selected mixed system (8, 9) is switched to the open state (step S12). ). In this switching control, the flow rate control valve 91 of the low temperature water supply path 9 belonging to the selected mixed system (8, 9) is controlled to open, and the flow of the low temperature water is detected by the flow sensor 92 by this open switching control. If it is confirmed, the open / close control of both the electromagnetic on-off valve 82 and the flow control valve 81 of the high-temperature water supply path 8 is controlled. Thereby, the high temperature water supplied from the high temperature water supply path 8 belonging to the mixing system (8, 9) and the low temperature water supplied from the low temperature water supply path 9 are mixed in the mixing unit 51, and will be described next. The mixed hot water whose temperature is controlled by the temperature control is discharged to the hot water outlet 5 and supplied to the bathtub 2 through the hot water connection pipe 5a.

  Along with this switching control, temperature control by a temperature control unit (not shown) is executed, and the detected temperature by the hot water temperature sensor 63, the detected temperature by the incoming water temperature sensor 73, the detected temperature by the hot water temperature sensor 52, and the remote controller 101. For example, feedback control is performed on both the flow rate control valve 81 of the high temperature water supply path 8 and the flow rate control valve 91 of the low temperature water supply path 9 based on the set hot water temperature set to, for example, the hot water supply path 5 after mixing. The temperature is adjusted so that the temperature of the mixed hot water discharged is equal to the set hot water temperature. At this time, since the high temperature water supply path 8 and the low temperature water supply path 9 opposed to each other at both downstream ends sandwiching each mixing portion 51 constitute one mixing system (8, 9), each mixing system (8 9), the distance from the hot water temperature sensor 63 to the mixing unit 51 on the high temperature water side is substantially the same as the distance from the incoming water temperature sensor 73 to the mixing unit 51 on the low temperature water side. For this reason, temperature control for temperature control can be performed easily and accurately.

  Then, the open state of the mixed system (8, 9) is continued until the closed time counter for the mixed system (8, 9) is reset (NO in step S13, YES in S11, S12). If the closing time counter is reset (YES in step S13), the mixed system (8, 9) that is currently open is switched to the closed state, and instead, the mixing system ( 8, 9) is selected, and the selected mixed system (8, 9) is newly switched to the open state (step S14). Along with this switching control, temperature control is also performed.

  In the case of the above closing time count control and the opening / closing switching control using this closing time count control, when the open state of a certain mixed system (8, 9) elapses for a predetermined time (set distribution time) (in step S3 of FIG. 3). YES), the mixed system (8, 9) is controlled to be closed (YES in step S13 in FIG. 4, S14). Instead, the other mixed system (8, 9) is controlled to be opened to be opened. Switching is performed sequentially (step S14). Accordingly, it is possible to effectively prevent the possibility of inconveniences such as the propagation of bacteria in the internal water due to the long closed state. Moreover, since the mixed system (8, 9) having the maximum closing time is selected as a target to be newly switched to the open state, the possibility of inconvenience due to the staying water can be ensured. Can be prevented. The selection of the mixed system (8, 9) to be switched to the open state can be determined by the length of the count value (closed time) of the closed time counter, while depending on the reset timing of the closed time counter, It is possible to set the timing for switching the mixed system (8, 9) in the open state to the closed state and switching the other mixed system (8, 9) to the open state.

  In the above, the example in which the closed time counter is reset when a predetermined time (set distribution time) has passed in the open state in the closed time count control has been described. However, as described below, a predetermined amount (for example, a set value) is set in the open state. If warm water of the amount of hot water passes, the closing time counter can be reset.

  That is, as shown in FIG. 5, if the corresponding mixed system (8, 9) is switched to the closed state based on the switching control signal to the closed state (YES in step S1), the mixed system (8, 9). Is started (step S2), and the counting of the closing time is continued as long as the closed state is maintained (YES in step S1, step S2).

  On the other hand, when the closed state is switched to the open state (NO in step S1), the amount of hot water from the mixed system (8, 9) in the open state is integrated (step S5), and the amount of hot water exceeding a predetermined set amount is discharged. (NO in step S6, NO in S1, S5). For example, when the amount of tapping water is integrated using the flow rate sensor 92 of the low-temperature water supply path 9, the detected flow rate value of the flow rate sensor 92 is controlled by temperature control to control the temperature to the set tapping temperature. From the ratio of the flow rate control values by the flow rate control valves 81 and 91, the hot water flow rate to the hot water flow path 5 at that time can be obtained, and this hot water flow rate value can be obtained by integrating with the passage of time. In this manner, the flow rate sensor 92 and the control unit 10 that performs calculations such as integration constitute a tapping amount detection means. Further, when a tapping flow rate sensor is installed in the tapping channel 5, the flow rate of the mixed hot water tapped into the tapping channel 5 may be detected by the tapping flow rate sensor and integrated. In this case, the hot water flow rate sensor and the control unit constitute the hot water amount detection means.

  On the other hand, if the set hot water amount (for example, 500L to 1000L) or more is discharged (YES in step S6), the closing time counter is reset (returns the count value to zero), and the accumulated hot water amount is also stopped. Reset (step S7).

  Based on the counting of the closing time by the closing time count control, the opening / closing switching control by the opening / closing switching control unit is assembled in the same manner as the above-described opening / closing switching control (see FIG. 4).

  In the case of such closing time count control and open / close switching control using this closing time count control, a certain hot water amount (set hot water amount) is exceeded in a certain mixed system (8, 9) by switching to the open state. When the corresponding low-temperature water and high-temperature water flows (YES in step S6 in FIG. 5), the mixed system (8, 9) is controlled to be closed (YES in step S13 in FIG. 4, S14), and instead Then, the other mixed systems (8, 9) are controlled to be opened and sequentially switched to the open state (step S14). As a result, all the mixed systems (8, 9, 8, 9, 8, 9) are allowed to flow low temperature water or high temperature water uniformly. The possibility of inconvenience such as breeding can be effectively prevented. Moreover, since the mixed system (8, 9) having the maximum closing time is selected as a target to be newly switched to the open state, the possibility of inconvenience due to the staying water can be ensured. Can be prevented. The selection of the mixed system (8, 9) to be switched to the open state can be determined by the length of the count value (closed time) of the closed time counter, while depending on the reset timing of the closed time counter, It is possible to set the timing for switching the mixed system (8, 9) in the open state to the closed state and switching the other mixed system (8, 9) to the open state.

  In addition, this invention is not limited to the said embodiment, A design change can be carried out suitably. For example, in the above-described embodiment, the mixing system (8, 9) configured by a pair of the high-temperature water supply path 8 and the low-temperature water supply path 9 arranged opposite to each other with the mixing unit 51 interposed therebetween is opened or closed as a unit. However, the present invention is not limited to this, and one or more selected from each of the plurality of high temperature water supply paths and the plurality of low temperature water supply paths can be the targets of the opening / closing switching control. In this case, a high-temperature water supply path (open / closed in the high-temperature water supply path) indicating the maximum count value (closed time) among a plurality of closed-time counters corresponding to each of the plurality of high-temperature water supply paths. Control valve composed of solenoid valve and flow control valve), and low temperature water supply showing the maximum count value (close time) from multiple closed time counters corresponding to each of multiple low temperature water supply paths Path (control valve composed of open / close solenoid valve and flow control valve intervening in this high temperature water supply path), and control to switch the selected high temperature water supply path and low temperature water supply path to the open state respectively. To do.

DESCRIPTION OF SYMBOLS 1 Hot water mixing hot-water supply apparatus 5 Hot water supply path 8 High temperature water supply path 9 Low temperature water supply path 10 Control part (open / close switching control part, temperature control part)
81, 91 Flow control valve (control valve)
82 Solenoid valve (control valve)
92 Hot water detection means

Claims (6)

A hot and cold water supply device configured to discharge hot water mixed with high temperature water and low temperature water to a hot water outlet,
A plurality of high-temperature water supply passages arranged in parallel so that the downstream ends merge with the hot water supply path and configured to supply high-temperature water so that they can be opened and closed independently of each other;
A plurality of low-temperature water supply paths that are arranged in parallel so that the downstream ends merge with the hot water supply path and are configured to supply low-temperature water so that they can be opened and closed independently of each other;
An open / close switching control unit for performing open / close switching control on each of the plurality of high-temperature water supply paths and the plurality of low-temperature water supply paths,
The open / close switching control unit includes a closed time counter for measuring the elapsed time from the start time of the closed state for each of the high temperature water supply paths and for each of the low temperature water supply paths, and the plurality of high temperature water supply While switching some of the high-temperature water supply paths selected from the path and some of the low-temperature water supply paths selected from the plurality of low-temperature water supply paths, the remaining high-temperature water supply paths and low-temperature water supply paths are closed. When the mixed hot water mixed in the state is discharged, the high-temperature water supply path and the low-temperature water supply path each having the maximum value of the closing time counter at the time of switching to the open state are selected and closed. It is configured to switch from the open state to the open state.
A hot and cold water supply apparatus characterized by that. A hot and cold water supply device configured to discharge hot water mixed with high temperature water and low temperature water to a hot water outlet,
A high-temperature water supply path that is arranged so that the downstream end merges with the hot water supply path and supplies hot water in a switchable manner, and a low-temperature water that is arranged so that the downstream end merges with the hot water discharge path can be switched between open and close A plurality of mixed systems that are paired with a low-temperature water supply channel configured to supply
An open / close switching control unit for controlling the open / close switching of each of the plurality of mixed systems;
The open / close switching control unit includes a closed time counter for measuring the elapsed time from the start point of the closed state for each of the mixed systems, and switches a part of the mixed systems selected from the plurality of mixed systems to the open state. On the other hand, when discharging the mixed hot water mixed by bringing the remaining mixing system into the closed state, at the time of switching to the open state, select the mixed system with the maximum value of the closing time counter from the closed state. It is configured to switch to the open state,
A hot and cold water supply apparatus characterized by that. A hot and cold water supply apparatus according to claim 1 or claim 2,
The open / close switching control unit is configured to reset the closing time counter when a predetermined set circulation time has elapsed after switching control from the closed state to the open state based on the closing time counter. Mixed water heater. A hot and cold water supply apparatus according to claim 1 or claim 2,
A tapping amount detecting means for detecting a tapping amount passing through the tapping channel,
The open / close switching control unit performs switching control from the closed state to the open state based on the closing time counter, and if the discharged hot water amount detecting means detects the amount of discharged hot water exceeding a predetermined set amount of hot water, A hot and cold water heater that is configured to reset. A hot and cold water supply apparatus according to claim 3 or 4,
The open / close switching control unit is configured to execute switching control to switch a target to be opened when the closing time counter is reset. A hot and cold water supply apparatus according to any one of claims 1 to 5,
Each of the high temperature water supply passages and each of the low temperature water supply passages are provided with a control valve for making the supply flow rate variable and switchable.
A hot and cold mixed hot water supply apparatus comprising a temperature adjustment control unit for controlling both control valves of the high temperature water supply path and the low temperature water supply path in an open state so that the temperature of the mixed hot water becomes a set hot water temperature .

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