JP2018031545A - Hot water/water mixing hot water supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water/water mixing hot water supply device capable of securing a hot water supply flow rate of mixture water while preventing remarkable increase of costs, and being automatically controlled so that a hot water supply temperature is adjusted to a set temperature set by a remote controller and the like.SOLUTION: In a hot water/water mixing hot water supply device 1 including a hot water supply pipe conduit 11, a high-temperature water supply pipe conduit 14 for supplying high-temperature water to the hot water supply pipe conduit 11, and a low-temperature water supply pipe conduit 15 for supplying low-temperature water to the hot water supply conduit 11, the plurality of high-temperature water supply pipe conduits 14 and low-temperature water supply pipe conduits 15 are arranged in parallel with the hot water supply conduit 11, flow rate control valves 16 are respectively disposed on the high-temperature water supply pipe conduits 14 and the low-temperature water supply pipe conduits 15, and further a temperature sensor 19 for detecting a temperature of the mixture water obtained by mixing high temperature water and low temperature water in the hot water supply pipe conduit 11, and a control portion 18 for controlling opening of the plurality of flow rate control valves 16 to keep the temperature of the mixture water at a predetermined set temperature, are disposed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot and cold water supply apparatus for adjusting temperature by mixing low temperature water with high temperature water and supplying hot water to a bathtub or the like.

  Patent Document 1 below discloses a high-temperature water supply line (10) for supplying high-temperature water (hot spring water), a low-temperature water supply line (20) for supplying low-temperature water, and both supply lines. A mixing valve (50) that mixes the high-temperature water and low-temperature water supplied by the mixture into an appropriate temperature mixed water, and a hot water supply pipe for supplying the mixed water mixed by the mixing valve (50) to a bathtub or the like ( 30) is disclosed.

  The mixing valve is provided with a temperature sensing means made of a bimetallic coil member that deforms in response to a change in the temperature of the mixed water, and is provided with high-temperature water and low-temperature water according to the deformation amount of the temperature-sensing means. The mixing ratio is adjusted to a predetermined temperature, and the temperature setting means is rotated by rotating the handle so that the set temperature of the mixed water can be adjusted manually. . Wax pellets are also well known as temperature sensing means, and a mixing valve that performs the same operation by incorporating wax pellets in place of the coil member may be used.

JP 2003-213742 A

  In the above-described conventional hot water / mixed hot water supply apparatus, the temperature of the mixed water is set by manually rotating the handle. However, it is desired that the temperature can be easily set remotely from a remote controller or the like.

  However, hot water and water mixing hot water supply devices such as those described above are often used as commercial hot water supply devices for supplying large amounts of hot water in hot spring facilities, large-scale accommodation facilities, elderly welfare facilities, or hot water pool facilities, In order to secure the hot water flow rate per unit time, the diameter of each supply pipe is also increased. To control the flow rate of large solenoid valves for opening and closing such large pipes and large pipes This large flow control valve is very expensive.

  Therefore, the present invention provides a hot and cold hot water mixing apparatus that can secure a hot water flow rate of mixed water and can automatically control the hot water temperature to a set temperature set by a remote controller or the like while avoiding a significant increase in cost. The purpose is to provide.

  In order to achieve the above object, the present invention takes the following technical means.

  That is, the present invention includes a hot water supply pipe, a high temperature water supply pipe for supplying high temperature water to the hot water supply pipe, and a low temperature water supply pipe for supplying low temperature water to the hot water supply pipe. In the hot / cold hot water supply apparatus, a plurality of the high temperature water supply pipes and the low temperature water supply pipes are provided in parallel to the hot water supply pipes. Are provided with flow control valves, respectively, and a temperature sensor for detecting the temperature of the mixed water obtained by mixing high-temperature water and low-temperature water in the hot water supply pipe, and the temperature of the mixed water becomes a predetermined set temperature. And a control unit that controls the opening degree of the plurality of flow control valves (Claim 1).

  According to the hot and cold mixed water supply apparatus of the present invention, since a plurality of high temperature water supply lines and low temperature water supply lines are provided in parallel to the hot water supply lines, the diameters of the respective supply lines are reduced. In addition, it is possible to ensure a large maximum supply flow rate of high-temperature water for the entire plurality of high-temperature water supply pipelines and a maximum supply flow rate of low-temperature water for the entire plurality of low-temperature water supply pipelines. In addition, by reducing the pipe diameter of each supply pipe, it is possible to divert the small and low-cost flow control valve used in household instantaneous water heaters and the like as the flow control valve, thereby reducing costs. The temperature of the mixed water can be adjusted to the set temperature by controlling the opening degree of each flow rate control valve while trying. Furthermore, a flow control valve provided in any one of the plurality of high-temperature water supply pipes, or a low-temperature water supply pipe provided in any one of the plurality of low-temperature water supply pipes. Even if the flow control valve breaks down and sticks at a predetermined opening, if the opening of another normal flow control valve is feedback controlled based on the detection value of the temperature sensor, the set temperature The hot water supply operation can be continued and the system availability can be improved.

  In the hot water / water mixing hot water supply apparatus of the present invention, the hot water supply pipe is provided with a plurality of mixing parts spaced apart in the pipe axis direction, and one hot water supply pipe and the one hot water supply pipe for each mixing part. A low-temperature water supply conduit may be connected to each other (Claim 2). More preferably, one high-temperature water supply pipe and one low-temperature water supply pipe may be connected to the mixing portion so as to face each other in the pipe radial direction. According to this, high temperature water and low temperature water respectively supplied from a pair of high temperature water supply pipe and low temperature water supply pipe connected to each mixing section are uniformly stirred and mixed in the mixing section, Therefore, the accuracy of the temperature of the mixed water detected by the temperature sensor is improved, and as a result, the flow control valve can be controlled more accurately.

  Further, the control unit may perform synchronous control so that a plurality of flow rate control valves provided in a plurality of high temperature water supply pipes for supplying high temperature water to the hot water supply pipes have the same opening degree ( Claim 3). According to this, it is possible to simplify the opening degree control of the plurality of flow rate control valves respectively provided in the plurality of high temperature water supply pipes. If there is a high-temperature water supply pipe that is not temporarily used, such as when the required hot water supply amount is small, or a high-temperature water supply pipe that has an abnormality in an electromagnetic on-off valve or flow control valve described later, It is not necessary to perform the above-mentioned synchronous control for the flow rate control valve of the high-temperature water supply pipeline, and preferably control is performed so that the opening degree of the flow rate control valve is minimized (in the closed state in the case of a flow rate control valve with a closing function) can do.

  Further, the control unit may perform synchronous control so that a plurality of flow rate control valves provided in a plurality of low temperature water supply pipes that supply low temperature water to the hot water supply pipes have the same opening degree ( Claim 4). According to this, it is possible to simplify the opening degree control of the plurality of flow rate control valves respectively provided in the plurality of low temperature water supply pipes. If there is a low-temperature water supply line that is not temporarily used, such as when the required hot water supply amount is small, or a low-temperature water supply line in which an abnormality occurs in an electromagnetic on-off valve or flow control valve described later, It is not necessary to perform the above-mentioned synchronous control for the flow rate control valve of the low-temperature water supply pipeline, and preferably control is performed so that the opening degree of the flow rate control valve is minimized (in the closed state in the case of a flow rate control valve with a closing function) can do.

  Each high temperature water supply pipe and each low temperature water supply pipe are provided with an electromagnetic on-off valve in series with the flow rate control valve, and the control unit includes each high temperature water supply pipe and each low temperature water supply pipe. Whether to use the passage may be determined based on a predetermined condition, and the electromagnetic on-off valve of the supply pipe that is not used may be controlled to be closed (Claim 5). According to this, a large hot water supply flow rate can be secured by opening and controlling all the solenoid on / off valves so as to use all the high-temperature water supply lines and all the low-temperature water supply lines, for example, when hot water is applied to the bathtub. The time required for hot water can be shortened. On the other hand, at the time of adding water operation for maintaining the water level in the bathtub, for example, any one high-temperature water supply pipe and any one low-temperature water supply pipe (preferably connected to one mixing unit). A pair of high-temperature water supply pipes and low-temperature water supply pipes) is selected and used, and other high-temperature water supply pipes and low-temperature water supply pipes are determined not to be used and are not used. The hot water supply flow rate can be suppressed by closing the electromagnetic on-off valve of the road. Therefore, for example, hot water is poured into the bathtub before business hours, and the hot water flow rate from the hot water supply line is suppressed during business hours, so that hot water is used for other purposes such as showers and cooking areas during business hours. Even so, the ability to supply high-temperature water is insufficient.

  Further, the control unit determines whether or not a predetermined abnormality has occurred in the electromagnetic on-off valves provided in the high-temperature water supply pipes and the low-temperature water supply pipes, and an abnormality has occurred in the electromagnetic on-off valves. The electromagnetic open / close valve of the supply pipe line may be configured to be closed (Claim 6). More preferably, the flow control valve, which will be described later, in the supply line in which an abnormality has occurred in the electromagnetic on-off valve can also be configured to be fully closed. According to this, even if an abnormality occurs in any one of the supply pipes, the hot water supply can be continued using the other high-temperature water supply pipe and the low-temperature water supply pipe. Although the determination timing of occurrence of abnormality may be appropriate, for example, abnormality determination of the electromagnetic on-off valve of any one supply pipe is performed at the start of hot water supply operation, and another time is determined at the start of the next hot water supply operation. The abnormality of the electromagnetic on-off valve can be judged one by one at the start of the hot water supply operation, such as judging the abnormality of the electromagnetic on-off valve in the supply pipeline. By storing and storing the abnormality information relating to the above, it is possible to continue the closing control of the electromagnetic on-off valve of the supply line in which the abnormality has occurred until repair and reset. Also, the abnormality determination method may be appropriate. For example, the flow rate of the supply line to be determined is closed in a state in which the electromagnetic on-off valves of all supply lines other than the supply line to be determined are closed. When the opening / closing control of the solenoid valve of the supply pipe to be judged is performed with the control valve set to a predetermined opening, if the presence or absence of water flow in the hot water supply pipe can be confirmed in response, it is judged normal. When the water supply pipe continues to flow even when the electromagnetic on / off valve is controlled to open or shut off, it can be determined that an abnormality has occurred in the electromagnetic on / off valve. In addition, the confirmation method of the presence or absence of water flow in the hot water supply pipe line may be appropriate. For example, a sensor having self-heating characteristics is used as the temperature sensor, and the detection temperature is increased by self-heating when there is no water flow. Can be used to detect the presence or absence of water flow. In addition, it is also possible to directly detect the presence or absence of water flow through the hot water supply pipe by providing a flow sensor or the like in the hot water supply pipe.

  Each flow control valve can be fully closed, and the controller determines whether to use each high-temperature water supply line and each low-temperature water supply line based on a predetermined condition and does not use it. The flow rate control valve of the supply line may be configured to be fully closed (Claim 7). Even with this configuration, for example, when hot water is supplied to the bathtub, the mixed water is set to a predetermined value without fully closing all the flow control valves so as to use all the high-temperature water supply lines and all the low-temperature water supply lines. By controlling the opening so as to reach the temperature, a large hot water supply flow rate can be secured, and the time required for hot water can be shortened. On the other hand, at the time of adding water operation for maintaining the water level in the bathtub, for example, any one high-temperature water supply pipe and any one low-temperature water supply pipe (preferably connected to one mixing unit). A pair of high-temperature water supply pipes and low-temperature water supply pipes) is selected and used, and other high-temperature water supply pipes and low-temperature water supply pipes are determined not to be used and are not used. By controlling the flow rate control valve of the road to be fully closed, the hot water supply flow rate can be suppressed. Therefore, for example, hot water is poured into the bathtub before business hours, and the hot water flow rate from the hot water supply line is suppressed during business hours, so that hot water is used for other purposes such as showers and cooking areas during business hours. Even so, the ability to supply high-temperature water is insufficient.

  In addition, the control unit determines whether or not a predetermined abnormality has occurred in the flow rate control valve provided in each high temperature water supply line and each low temperature water supply line, and an abnormality has occurred in the flow rate control valve. The flow rate control valve of the supply line may be configured to be fully closed (Claim 8). More preferably, the electromagnetic on-off valve in the supply line in which an abnormality has occurred in the flow control valve can also be configured to be closed. According to this, even if an abnormality occurs in any one of the supply pipes, the hot water supply can be continued using the other high-temperature water supply pipe and the low-temperature water supply pipe. The determination timing of the occurrence of the abnormality of the flow control valve may be appropriate, for example, the abnormality determination of the flow control valve of any one supply pipe is performed at the start of the hot water supply operation, and the next hot water supply operation is started. If the abnormality of the flow control valve in another supply line is determined, the abnormality of the flow control valve can be determined one by one at the start of the hot water supply operation. By storing and holding the abnormality information related to the nonvolatile memory, it can be configured to continue the fully-closed operation control of the flow rate control valve of the supply line in which the abnormality has occurred until it is repaired and reset. Also, the abnormality determination method may be appropriate, for example, as a flow control valve, a fully closed state signal indicating that it is fully closed when it is fully closed, and a fully open state when it is fully opened. Output the full open state signal to the control unit, and when the control unit performs full open operation control and full close operation control of the flow control valve with the electromagnetic on-off valve closed, the full open state signal and the full close state signal When at least one of them is not output, it can be determined that an abnormality has occurred in the flow control valve.

  Further, the control unit opens the opening control value of the flow control valve on the high temperature water supply pipe side (hereinafter referred to as “high temperature side control value”) and the flow control valve on the low temperature water supply pipe side with respect to the common control value. Degree control value (hereinafter referred to as “low temperature side control value”) is stored, and the common control value is controlled based on the detection value of the temperature sensor and based on the common control value. The opening degree of the flow rate control valve of each supply line may be controlled using the required high temperature side control value and low temperature side control value (claim 9). According to this, the opening control of separate flow rate control valves separately provided in the high temperature water supply pipe and the low temperature water supply pipe using one common control value like a single-shaft mixing valve. Thus, the temperature of the mixed water can be adjusted, and the opening control of the plurality of flow control valves can be further simplified.

  Further, the relationship is set so that the mixing ratio of the low temperature water to the high temperature water increases or decreases as the common control value increases, and the high temperature side is within a predetermined range from the smallest value of the common control value. Either one of the control value and the low temperature side control value may be set so as not to fluctuate with the minimum value, and the other may be set so as not to fluctuate with the minimum value within a predetermined range from the largest value of the common control value ( Claim 10). According to this, when the common control value is within a predetermined range from the smallest value, for example, the low temperature side control value remains unchanged at the minimum value, and the higher the common control value becomes from the smallest value, the higher the value becomes. When the above-mentioned relationship is set so that the side control value gradually decreases from the maximum value, and the common control value is within the predetermined range from the maximum value, the high temperature side control value remains unchanged at the minimum value. By setting the relationship so that the low temperature side control value gradually decreases from the maximum value as the common control value decreases from the largest value, the temperature can be adjusted almost proportionally by the common control value. The flow rate of the mixed water is made as large as possible by increasing the opening of the flow control valve of the high-temperature water supply pipe and the opening of the flow control valve of the low-temperature water supply pipe near the center of the common control value. Secure large

  According to the present invention, there is provided a hot and cold mixed hot water supply apparatus capable of ensuring a hot water supply flow rate of mixed water and automatically controlling the hot water temperature to a set temperature set by a remote controller or the like while avoiding a significant increase in cost. Can be provided.

It is an operation principle figure of the hot and cold mixed hot water supply apparatus according to one embodiment of the present invention. It is a graph which shows the relationship between the opening degree control value of the flow control valve of the hot water mixing hot-water supply apparatus, and a common control value. It is a graph which shows the relationship between the common control value and flow volume of the hot water mixing hot-water supply apparatus.

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

  FIG. 1 shows a hot / cold hot water supply apparatus 1 according to an embodiment of the present invention, and hot water supplied from a hot water supply system (preferably, a connected hot water supply system in which a plurality of hot water heaters are connected). And low temperature water (normal temperature non-heated water etc.) supplied from water sources, such as a water supply, is mixed in the hot water supply pipe 11, and the mixed water is comprised so that hot water may be supplied to the bathtub 3.

  That is, the hot and cold mixed hot water supply apparatus 1 according to the present embodiment is supplied with a hot water supply pipe 11, a hot water supply pipe 12 to which, for example, high-temperature water at 80 ° C. is supplied from the hot water supply system, and low-temperature water at 20 ° C. from the water source. Provided in parallel between the incoming water line 13, the three hot water supply pipes 14 provided in parallel between the hot water inlet line 12 and the hot water supply pipe 11, and the incoming water pipe 13 and the hot water supply pipe 11 The three low-temperature water supply pipes 15 are provided. The hot water supply pipe 11, the hot water supply pipe 12, and the water supply pipe 13 are arranged so that their pipe axis directions are substantially parallel, and the hot water supply pipe 11 is disposed at an intermediate position between the hot water supply pipe 12 and the water supply pipe 13. Has been.

  The hot water supply pipe 11 is provided with three mixing portions 11a that are separated from each other in the pipe axis direction. One high-temperature water supply pipe 14 and one low-temperature water supply pipe 15 are provided for each mixing section 11a. Are connected to each other. A pair of high-temperature water supply pipes 14 and low-temperature water supply pipes 15 connected to each mixing unit 11 a are provided to face each other in the diameter direction of the hot water supply pipes 14. The supplied high-temperature water and low-temperature water are agitated and mixed in the mixing section 11a.

  Each high temperature water supply line 14 connects the hot water supply line 12 and the hot water supply line 11 so that the high temperature water in the hot water supply line 12 is supplied to the hot water supply line 11 by the hot water supply pressure from the hot water supply system. The plurality of high-temperature water supply pipes 14 are provided in parallel with the hot water supply pipe 11 in the pipe axis direction. The hot water supply system may supply high-temperature water using the water supply pressure of the water source.

  Each low-temperature water supply line 15 connects the incoming water line 13 and the hot water supply line 11 so that the low-temperature water in the incoming water line 13 is supplied to the hot water supply line 11 by the supply pressure of the water source. The low-temperature water supply line 15 is provided in parallel with the hot-water supply line 11 along the pipe axis direction. In addition, when the hot water supply pressure depends on the water supply pressure of the water source, in order to adjust the supply pressure of the low temperature water in accordance with the pressure loss in the hot water supply system, the water supply pipe is connected from the water source through a predetermined governor (pressure regulator). It is preferable that low temperature water is supplied to the channel 13.

  In addition, the pipe diameter (bore diameter) of the hot water supply pipe 11 is larger than each pipe diameter of the hot water supply pipe 12 and the incoming water pipe 13 and is, for example, about twice as large as the cross-sectional area of the flow path. The pipe diameter of the hot water inlet pipe 12 and the pipe diameter of the incoming water pipe 13 are made equal. Moreover, the pipe diameters of the high-temperature water supply pipes 14 and the low-temperature water supply pipes 15 are smaller than the pipe diameters of the hot water supply pipe 12 and the water inlet pipe 13, and these supply pipes 14 and 15 have a relatively small diameter. It is composed of piping. For example, the pipe diameters of the supply pipes 14 and 15 may be the same pipe diameter as the pipe used in a general domestic instantaneous water heater.

  Each high temperature water supply pipe line 14 and each low temperature water supply pipe line 15 are respectively provided with a flow rate control valve 16 and an electromagnetic on-off valve 17 corresponding to the pipe diameters in series. In the illustrated embodiment, the electromagnetic on-off valve 17 is disposed on the upstream side (on the hot water inlet 12 or the water inlet 13), and the flow control valve 16 is disposed on the downstream (on the hot water source 11) side. The flow rate control valve 16 and the electromagnetic on-off valve 17 are connected by wiring so that their operations are controlled by a controller 18 (control unit).

  The flow control valve 16 is configured such that the opening degree can be adjusted from fully closed to fully open by driving a valve shaft (not shown) by a stepping motor M that is driven and controlled by the controller 18, and the valve shaft is set to the fully closed position. Then, a predetermined fully closed state signal is output to the controller 18, and when the valve shaft is in the fully open position, a predetermined fully open state signal is output to the controller 18. In addition, the control step value of each stepping motor M can be corrected based on the fully open state signal or the fully closed state signal at a predetermined timing such as when the hot water supply operation is started.

  The hot water supply pipe 11 is provided with a hot water thermistor 19 (temperature sensor) downstream of the three mixing portions 11a (on the hot water outlet side), and detects the temperature of the mixed water flowing through the hot water supply pipe 11. The detected value is output to the controller 18. In the illustrated example, two hot water thermistors 19 are attached at two locations in the diameter direction of the hot water supply pipe 11. The two detected values of the two hot water thermistors 19 can be used for various purposes. For example, the average value of the detected values of the two hot water thermistors 19 is used as the temperature of the mixed water, or one hot water thermistor 19 is used as the main hot water supply temperature. The other hot water thermistor 19 can be used as a sensor for high temperature detection at the time of main failure, and can be designed as appropriate according to required functions, safety, and the like.

  In the figure, reference numeral 12a denotes a hot water thermistor (temperature sensor) for detecting the temperature of the hot water, and reference numeral 13a denotes a hot water thermistor (temperature sensor) for detecting the temperature of the low temperature water. The detected values of the hot water thermistor 12a and the hot water thermistor 13a. Is output to the controller 18. In addition, a water level sensor 31 is attached to the bathtub 3 so that the water level detection value is output to the controller 18. Moreover, the filter 32 for circulating and filtering the hot water in the bathtub 3 is installed, the filter 32 is started when the predetermined filter starting water level L3 is exceeded, and the predetermined lower than the filter starting water level L3. It can be configured that the filter 32 is stopped when it falls below the filter stop water level L4. A remote controller 21 connected to the controller 18 is installed at an appropriate position. By the remote controller 21, various operations such as setting a hot water supply temperature to the bathtub 3 and starting a hot water operation control to the bathtub 3 are performed. Can be done.

  When a hot water supply temperature setting operation is performed by the remote controller 21, set temperature information is transmitted to the controller 18, and the controller 18 stores the set temperature in a storage unit such as a nonvolatile memory.

  In addition, when a hot water operation start operation for the bathtub 3 is performed by the remote controller 21, a hot water operation command signal is transmitted to the controller 18. When the controller 18 receives the hot water operation command signal, the controller 18 starts hot water supply to the bathtub 3 in the hot water operation mode (first operation mode). When the controller 18 detects that the water level in the bathtub 3 has reached the set water level L1, the controller 18 automatically shifts to the additional hot water operation mode (second operation mode), and the water level in the bathtub 3 maintains the set water level L1. The hot water supply to the bathtub 3 is performed intermittently or continuously. For example, the hot water supply can be stopped when the set water level L1 (replenishment stop water level) is exceeded, and the hot water supply can be started when it falls below a predetermined supplemental water start water level L2 lower than the set water level L1.

Hereinafter, the control configuration of the hot water operation mode and the additional hot water operation mode will be described.
[Hot water operation mode]

  In the hot water operation mode, the controller 18 controls to open all the electromagnetic on-off valves 17 provided in all the high-temperature water supply pipes 14 and all the low-temperature water supply pipes 15, and the detected value of the hot water thermistor 19 The control is configured to feedback-control the opening degree of all the flow control valves 16 so that the set temperature is reached. In order to shorten the convergence time of the hot water supply temperature at the beginning of the hot water supply operation, the initial value of the opening of each flow control valve 16 is obtained by calculation based on the detected values of the hot water thermistor 12a and the hot water thermistor 13a, and then the hot water is discharged. It is also possible to configure to perform feedback control based on the detection value of the thermistor 19.

  Although the opening degree control method of the plurality of flow rate control valves 16 can be set as appropriate, in this embodiment, it is provided in all the hot water supply pipes 14 used for supplying hot water to the hot water supply pipe 11. The plurality of high temperature side flow rate control valves 16 are synchronously controlled so as to have the same opening, and a plurality of low temperature water supply pipes 15 used for supplying low temperature water to the hot water supply pipe 11 are provided. Synchronous control is performed so that the low temperature side flow control valve 16 has the same opening degree. More specifically, a control signal based on the same high temperature side control step value is output to the stepping motors M of the plurality of high temperature side flow control valves 16 and the same low temperature side is supplied to the stepping motors M of the plurality of low temperature side flow control valves 16. A control signal based on the control step value is output.

  Further, in the present embodiment, as shown in FIG. 2, the storage means such as the nonvolatile memory of the controller 18 has a high temperature side control step value (high temperature side control value) and a low temperature side control step value (low temperature side) for the common control value. Control value) is stored and held in the form of a mathematical expression or a relation table. In more detail, the relationship is set so that the temperature of the mixed water increases as the common control value increases, that is, the mixing ratio of the low-temperature water to the high-temperature water decreases. Within the range from 0 step to 2000 steps, which is the smallest value, the low temperature side control step value remains unchanged at 0 step, which is the minimum value, and the low temperature side control step value has a common control value of 2000 steps or more. Each time the common control value increases by one step, the low temperature side control step value also increases by one step. On the other hand, the high-temperature side control step value remains unchanged at 0 step within the range from 5000 steps to 3000 steps, which is the largest common control value, and is common when the common control value is 3000 steps or less. The relationship is set so that the high temperature side control step value increases by one step each time the control value decreases by one step.

  Each flow control valve 16 on the high temperature side and the low temperature side is fully open when the control step value is 0 step, almost fully open when 500 steps or less, almost closed when 2000 steps or more, and fully closed when 3000 steps. The above relationship is set so that both flow rate control valves 16 are not less than the step value (500 steps in the above example) at which both flow control valves 16 are almost fully open.

  As described above, the range in which the high temperature side control step value is varied and the range in which the low temperature side control step value are varied are shifted and related to the common control value, whereby the high temperature side flow control valve 16 and the low temperature side flow rate are related. Although the control valve 16 is a separate control valve, it can be linked and controlled using a common control value like a single-shaft mixing valve, and both flow rate control valves 16 near the center of the common control value. Is almost fully open, and as shown in FIG. 3, a large maximum hot water supply flow rate of the mixed water from the hot water supply pipe 11 can be secured.

  The controller 18 feedback-controls the common control value so that the detected value of the hot water thermistor 19 becomes the set temperature during the hot water operation mode, and performs control based on the high-temperature side control step value obtained based on the common control value. The opening degree of each flow control valve 16 is adjusted by outputting a control signal based on the signal and the low temperature side control step value to the stepping motor M of the flow control valve 16 of each supply line.

  If the hot water supply temperature does not reach the set temperature even when feedback control of the common control value is performed during the hot water operation mode, either a closed sticking failure of one of the flow control valves 16 on the high temperature side or the low temperature side It can be estimated that the cause is an open sticking failure of one of the flow control valves 16. When such an abnormality occurs, the abnormality may be notified and the operation may be stopped, but the hot water supply at the set temperature can be continued by performing the following control.

That is, when the hot water supply temperature does not reach the set temperature during the hot water operation mode, the plurality of low temperature side electromagnetic on-off valves 17 are closed and controlled one by one. Open control is performed again to close another electromagnetic on-off valve 17, and when the hot water supply temperature reaches the set temperature, the on-off control of the electromagnetic on-off valve 17 that is closed is continued. Hot water can be continued. If the failure due to the close contact of any one of the flow control valves 16 on the high temperature side is the cause, the flow balance between the high temperature water and the low temperature water is restored by closing the solenoid on / off valve 17 on either low temperature side. Thus, hot water supply at the set temperature can be resumed. In addition, when one of the flow control valves 16 on the low temperature side is caused by an open sticking failure, the abnormal flow rate is controlled by the closing control of the electromagnetic on-off valve 17 provided in series with the abnormal flow control valve 16. Outflow of low-temperature water from the control valve 16 is prevented, so that hot water supply at the set temperature can be resumed.
[Additional hot water operation mode]

  In the additional hot water operation mode, the controller 18 selects and uses only the pair of the high-temperature water supply pipe 14 and the low-temperature water supply pipe 15 connected to any one (or a plurality of) mixing units 11a. Then, it is determined that the paired high-temperature water supply pipe 14 and low-temperature water supply pipe 15 connected to the other mixing unit 11a are not used. The pair of supply lines 14 and 15 to be used can be designed as appropriate, and the supply lines to be used at a predetermined cycle such as every day or every week, or every time the addition water operation mode is activated. 14,15 pairs can be rotated.

And about the supply pipelines 14 and 15 to be utilized, while performing the water replenishment operation | movement to a bathtub, while opening-controlling the electromagnetic on-off valve 17 of these supply pipelines 14 and 15, the flow control valve 16 of these supply pipelines 14 and 15 Is controlled by the same control method as the opening control in the hot water operation mode. On the other hand, for the supply lines 14 and 15 that are not used, the electromagnetic on-off valve 17 of the supply lines 14 and 15 is closed and the flow control valve 16 of the supply lines 14 and 15 is fully closed. Thus, the outflow of hot water from unused supply pipelines 14 and 15 is reliably prevented, and hot water and cold water are supplied only from a pair of high temperature water supply pipeline 14 and low temperature water supply pipeline 15. The water replenishment operation in the hot water operation mode can be performed with a less hot water supply flow rate than in the beam operation mode.
(Abnormality judgment control)

  In addition, the controller 18 makes an abnormality determination of each flow control valve 16 and the electromagnetic on-off valve 17 at a predetermined timing, so that the supply lines 14 and 15 in which the abnormality has occurred are heated until a reset operation is performed after repair. The control is configured not to be used in the operation mode or the hot water operation mode. If an abnormality occurs on the high-temperature water supply pipeline 14 side, the control structure is configured not to use the low-temperature water supply pipeline 15 paired therewith, or if an abnormality occurs on the low-temperature water supply pipeline 15 side, The control structure can be configured not to use the paired high-temperature water supply pipe 14. According to this, the balance between the maximum flow rate of the high-temperature water and the maximum flow rate of the low-temperature water is maintained, and the temperature adjustment control of the mixed water is performed. Stability can be improved.

  The abnormality determination method may be appropriate. For example, abnormality determination processing for the flow control valve 16 and the electromagnetic opening / closing valve 17 provided in the pair of supply pipes 14 and 15 to be used at the start of the addition water operation mode. It can be performed.

  As an abnormality determination method for each flow control valve 16, for example, a full open state signal is output when the fully open operation control is performed with the electromagnetic on-off valve 17 provided in series closed, and the full close operation control is performed when the full close operation control is performed. If a closed state signal is output, it is determined that the signal is normal, and if any signal is not output, it can be determined that an abnormality has occurred.

  Further, as a method for determining the abnormality of the electromagnetic open / close valve 17, for example, the pair of electromagnetic open / close valves 17 are simultaneously controlled to open / close while the flow control valves 16 on the high temperature side and the low temperature side are set to a predetermined opening (for example, fully open). Then, the temperature detected by the hot water thermistor 19 when both the electromagnetic on-off valves 17 are controlled to open is within a predetermined temperature range (for example, within a range of ± 10 ° C. centering on the average value of the temperature of the high temperature water and the temperature of the low temperature water). If the detected temperature is substantially the temperature of the high temperature water, it is determined that the low temperature side electromagnetic on-off valve 17 is closed and stuck. If it is determined that the electromagnetic on-off valve 17 is closed and stuck, and the detected temperature is higher than a predetermined high temperature (for example, 100 ° C. or higher), the hot water thermistor 19 is self-heated due to the absence of water flow and becomes high temperature. It is estimated that both electromagnetic on-off valves 17 It can be determined to be abnormal (or water outage). Further, if the detected temperature of the hot water thermistor 19 when the both solenoid on-off valves 17 are controlled to be closed is determined to be normal if the detected temperature is equal to or higher than a predetermined high temperature, and if the detected temperature is substantially the temperature of high-temperature water, the high-temperature side electromagnetic If it is determined that the open / close failure of the on-off valve 17 is detected, and the detected temperature is substantially the temperature of the low-temperature water, it can be determined that the open / close failure of the electromagnetic open / close valve 17 on the low temperature side.

  According to the hot and cold water supply apparatus according to the present embodiment described above, the hot water supply temperature is set by feedback control of a common control value even if the supply pressure of the high temperature water and the supply pressure of the low temperature water vary depending on various conditions. The temperature can be maintained, and the stability of temperature control can be improved. Furthermore, in the present embodiment, a total of six flow control valves 16 are provided, and even if any one or a plurality of flow control valves 16 fail, a common control value is feedback controlled based on the hot water supply temperature. As a result, the number of steps of the common control value automatically changes, and hot water supply at the set temperature can be continued. At this time, the opening degree of each flow control valve 16 is controlled to be as large as possible. Therefore, even if the supply of the high-temperature water and / or low-temperature water from the supply pipes 14 and 15 in which an abnormality has occurred is stopped, it is possible to avoid a significant decrease in the hot water supply flow rate.

  The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, the supply pipes 14 and 15 can be configured to be opened and closed only by the closing function of the flow control valve 16 without providing the electromagnetic open / close valves 17 of the supply pipes 14 and 15. Moreover, you may use the flow control valve 16 which does not have a closing function.

DESCRIPTION OF SYMBOLS 1 Hot water mixed hot water supply apparatus 11 Hot water supply pipe 11a Mixing part 14 High temperature water supply line 15 Low temperature water supply line 16 Flow control valve 17 Electromagnetic switching valve 18 Control part (controller)
19 Temperature sensor (hot water thermistor)

Claims (10)

In a hot and cold water supply apparatus comprising a hot water supply line, a high temperature water supply line for supplying high temperature water to the hot water supply line, and a low temperature water supply line for supplying low temperature water to the hot water supply line,
A plurality of the high-temperature water supply pipes and the low-temperature water supply pipes are provided in parallel to the hot water supply pipes, and a flow rate control valve is provided in each high-temperature water supply pipe and each low-temperature water supply pipe. Each provided,
A temperature sensor for detecting a temperature of mixed water obtained by mixing high temperature water and low temperature water in the hot water supply pipe; and opening the plurality of flow control valves so that the temperature of the mixed water becomes a predetermined set temperature. And a hot water / mixed hot water supply apparatus characterized by comprising a control unit for controlling the degree.   2. The hot and cold mixed hot water supply apparatus according to claim 1, wherein the hot water supply pipe is provided with a plurality of mixing portions that are spaced apart from each other in the pipe axis direction, and one hot water supply pipe and one for each mixing portion. And a low-temperature water supply pipe connected to each other.   3. The hot and cold water mixing apparatus according to claim 1, wherein the control unit has a plurality of flow rate control valves provided in a plurality of high temperature water supply pipes for supplying high temperature water to the hot water supply pipes with the same opening degree. A hot and cold water supply apparatus characterized by being controlled synchronously.   4. The hot water / mixed hot water supply apparatus according to claim 1, wherein the controller is configured to open a plurality of flow rate control valves provided in a plurality of low temperature water supply pipes for supplying low temperature water to the hot water supply pipe. A hot and cold mixed hot water supply apparatus characterized by performing synchronous control so that the temperature becomes constant.   5. The hot and cold water supply apparatus according to claim 1, wherein each high temperature water supply line and each low temperature water supply line are provided with an electromagnetic on-off valve in series with the flow rate control valve, and the control The unit is configured to determine whether or not to use each high-temperature water supply line and each low-temperature water supply line based on a predetermined condition, and to close and control the electromagnetic on-off valve of the supply line that is not used. A hot and cold water supply apparatus characterized by that.   The hot / cold hot water supply apparatus according to any one of claims 1 to 5, wherein the control unit has a predetermined abnormality occurred in each of the high temperature water supply pipes and the electromagnetic on-off valves provided in each of the low temperature water supply pipes. A hot and cold mixed hot water supply apparatus configured to determine whether or not and close the electromagnetic on / off valve of the supply pipe line where an abnormality has occurred in the electromagnetic on / off valve.   In the hot and cold water supply apparatus according to any one of claims 1 to 6, each flow control valve can be fully closed, and the controller uses each high-temperature water supply line and each low-temperature water supply line. A hot and cold mixed hot water supply apparatus is configured to control whether or not the flow rate control valve of the supply pipe line not to be used is fully closed while determining whether or not to perform based on a predetermined condition.   The hot / cold hot water supply apparatus according to any one of claims 1 to 7, wherein the control unit has a predetermined abnormality occurred in a flow rate control valve provided in each high temperature water supply line and each low temperature water supply line. A hot water / mixed hot water supply apparatus configured to control whether or not the flow rate control valve of the supply line in which an abnormality has occurred in the flow rate control valve is fully closed.   9. The hot and cold water supply apparatus according to claim 1, wherein the controller is configured to control an opening degree of a flow rate control valve on a high temperature water supply pipe side with respect to a common control value (hereinafter, “high temperature side control value”). And the opening degree control value of the flow rate control valve on the low-temperature water supply pipe side (hereinafter referred to as “low-temperature side control value”), and the common relationship based on the detection value of the temperature sensor. And controlling the opening degree of the flow control valve of each supply line using the high temperature side control value and the low temperature side control value obtained based on the common control value. A hot water / mixed hot water supply device.   The hot water / water mixing hot water supply apparatus according to claim 9, wherein the relationship is set such that the mixing ratio of the low temperature water to the high temperature water increases or decreases as the common control value increases, and the common control value One of the high-temperature side control value and the low-temperature side control value remains at the minimum value within the predetermined range from the smallest value and does not vary, while the other is the minimum value within the predetermined range from the largest value of the common control value. A hot / cold hot water supply apparatus characterized by being set so as not to fluctuate.

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