JP6355069B2 - Hot water mixing device - Google Patents

Description

  The present invention relates to a hot and cold water mixing device, and more particularly to a device equipped with a drainage mode capable of draining water when power is reset.

  Conventionally, solar water heaters that use solar heat to heat water have been widely used. In this solar water heater, a tank integrated type in which the heat collection panel and the storage tank are integrally installed on the roof, a tank separation type in which the heat collection panel is installed on the roof, and the storage tank is installed on the ground, etc. Is in practical use. In the tank-integrated solar water heater, water is directly heated by natural circulation between the heat collecting panel and the storage tank by convection.

  In the above solar water heater, a heat medium (antifreeze) is circulated between the heat collection panel and the storage tank via a circulation pump, and the heat storage panel heated by the heat collection panel is stored in the storage tank. It is also widely known that the water in the storage tank is indirectly heated by exchanging heat with the generated water.

  The hot water stored in the above storage tank is discharged to a desired hot water supply destination through an auxiliary heat source device (hot water heater) installed on the ground side. Is too high, it is necessary to adjust the temperature when tapping. For this reason, between the solar water heater and the auxiliary heat source machine, after the high temperature water heated by the solar water heater is mixed with the low temperature water supplied from the water source to adjust the temperature to the set temperature, the auxiliary heat source machine A hot and cold water mixing device is installed.

  By the way, in the above hot and cold water mixing device, water is generally removed from the hot water and water mixing device in order to prevent water decay and freeze when not in use for a long time due to regular maintenance or long-term absence of users. It is necessary to drain the water. Techniques relating to drainage of this type of hot and cold water mixing apparatus are disclosed in various documents as shown below.

  For example, in the hot water mixing unit for hot water heater of Patent Document 1, a hot water channel connected to a solar water heater, a cold water channel connected to a water source, and a mixing valve (mixing controller) installed at a junction of the hot water channel and the cold water channel And a mixed water channel through which the mixed water whose temperature is adjusted by this mixing valve flows, and when draining water, resetting the power (turning on the power after turning the power off) enables various kinds of mixing valves, etc. A technique for draining water by setting the valve body of the valve means to a position suitable for drainage is disclosed.

Japanese Patent No. 3718644

  However, in the water draining technology in the hot water mixing unit for hot water heaters of Patent Document 1, water draining is started with a power reset as a trigger, so that the power is turned off even when the hot water mixing device is restored to normal power outage. The power reset that is turned on is performed, and the same setting as the draining is performed for various valve means, although the draining of the hot water mixing apparatus is not performed.

  For this reason, in the hot water mixing unit for hot water supply of Patent Document 1, the position of the valve body of various valve means of the hot water mixing apparatus is suitable for drainage after power failure recovery (for example, both hot water side and water side in the case of a mixing valve) Therefore, there is a problem that hot water is directly discharged when the hot water is discharged from the hot water supply destination.

  An object of the present invention is to provide a hot and cold water mixing device that can perform drainage by distinguishing between power reset and power failure recovery, and that can prevent high-temperature hot water at the time of power failure recovery during normal use. It is.

  The hot and cold water mixing device according to claim 1 is a hot water and water mixing device that mixes high temperature water and low temperature water with respect to the auxiliary heat source unit to discharge hot water at a set temperature, and includes a plurality of valve means for supplying power. In a hot and cold water mixing device having a drainage mode for setting the plurality of valve means to drainage positions by performing a power reset that is temporarily stopped and restarted, the hot water mixer is communicably connected to the auxiliary heat source unit, and the power reset is performed. When it detects, it communicates with the said auxiliary heat source machine, and when this communication signal is not detected, it has the drainage operation control means which transfers to the said drainage mode, It is characterized by the above-mentioned.

  According to a second aspect of the present invention, there is provided the hot water mixing apparatus according to the first aspect, wherein the drain operation control means performs normal control without shifting to the drain mode when the communication signal is detected. Yes.

  According to the invention of claim 1, the hot and cold water mixing device is communicably connected to the auxiliary heat source unit, and when detecting a power reset, performs communication with the auxiliary heat source unit, and when this communication signal is not detected. Is equipped with a drain operation control means to shift to the drainage mode, so it will not immediately shift to the drainage mode when a power reset is detected, but will switch to the drainage mode after confirming the presence or absence of communication with the auxiliary heat source machine. The drainage operation control can be executed.

  Therefore, the drainage operation control means, when the communication signal of the auxiliary heat source unit is not detected at the time of power reset, that is, the auxiliary heat source unit installed on the downstream side of the hot water mixing device is drained, and the power source of the auxiliary heat source unit is When it is in the off state, the hot water mixing apparatus can be surely drained by shifting the hot water mixing apparatus to the drainage mode and executing the drainage operation.

  Moreover, since a communication signal is transmitted from the auxiliary heat source unit in the normal use state when the power is restored, the drain operation control means determines whether or not there is communication with the auxiliary heat source unit, compared to when draining water. In this way, it is possible to perform the drainage with a certain distinction between when the power is reset and when the power is restored.

  According to the invention of claim 2, when the communication signal is detected, the drain operation control means performs normal control without shifting to the drain mode, so that the auxiliary heat source machine is in a communicable state and is in a normal use state. If this is the case, the hot water mixing apparatus is prevented from shifting to the drainage mode and is normally controlled, so that hot hot water can be prevented when the hot water is discharged from the hot water supply destination.

It is a schematic block diagram of the hot water mixing device which concerns on the Example of this invention. It is a flowchart of drainage operation control.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

First, the installation state of the hot and cold water mixing apparatus 1 of the present invention will be briefly described.
As shown in FIG. 1, the hot water / water mixing device 1 mixes high temperature water heated by the solar water heater 2 with low temperature water supplied from a water source, adjusts the temperature to a set temperature, and then sends it to the auxiliary heat source unit 3. Hot water is supplied from a desired hot-water tap 9 and is installed between the solar water heater 2 installed on the roof and the auxiliary heat source unit 3 installed on the ground side.

  The solar water heater 2 is a known tank-integrated solar water heater 2 that includes a heat collecting panel 2a and a storage tank 2b, and these are integrally configured. The auxiliary heat source device 3 is a burner or a heat exchanger. It is a well-known combustion type hot water heater that incorporates the like. An external water supply passage 4 extending from the water supply source is connected to the storage tank 2 b of the solar water heater 2, and an external hot water passage 5 extending from the storage tank 2 b of the solar water heater 2 is connected to the hot water mixing device 1 and extends from the hot water mixing device 1. An external hot water passage 6 is connected to the auxiliary heat source unit 3.

Next, a specific structure of the hot water / mixer 1 will be described.
As shown in FIG. 1, a hot water mixing apparatus 1 includes a water supply passage 11 through which low temperature water flows, a hot water passage 12 through which high temperature water flows, a mixing valve 13 for mixing high temperature water and low temperature water, and mixed hot water at a set temperature. A flowing hot water passage 14, a pump 15 for sending the mixed hot water to the auxiliary heat source unit 3, a control unit 20 for controlling various devices, and the like are provided in an outer case 17.

  The water supply passage 11 supplies the mixing valve 13 with low-temperature water supplied from a water supply source through a pressurized cistern, and the upstream end of the water supply passage 11 has a drain plug-attached joint 11a having a filter function. The downstream end of the water supply passage 11 is connected to the water-side connection port of the mixing valve 13. In the water supply passage 11, a freezing prevention heater 11b, a check valve 11c, a pressure reducing valve 11d, and a temperature sensor 11e are installed in this order from the upstream side to the downstream side. The pressure reducing valve 11d is installed in the water supply passage 11 to reduce the low temperature water supplied from the water supply source to a preset value (for example, 80 kPa).

  The hot water passage 12 supplies high-temperature water supplied from the solar water heater 2 to the mixing valve 13, and the upstream end of the hot water passage 12 is connected to the external hot water via a drain plug connection joint 12 a having a filter function. Connected to the downstream end of the passage 5, the downstream end of the hot water passage 12 is connected to the hot water side connection port of the mixing valve 13. In the warm water passage 12, an antifreezing heater 12b, a check valve 12c, a temperature sensor 12d, and an on-off valve 16 for avoiding high-temperature hot water are sequentially installed from the upstream side to the downstream side.

  The mixing valve 13 controls the mixing ratio of the high temperature water flowing from the hot water passage 12 and the low temperature water flowing from the water supply passage 11 so that the tapping temperature becomes the command temperature (set temperature). This is a known mixing valve for pouring hot water into the hot water passage 14. The on-off valve 16 for avoiding high-temperature hot water provided in the hot water passage 12 is a known normally-closed electromagnetic valve that can selectively switch between supply and stop of supply of high-temperature water to the mixing valve 13 by opening and closing. The mixing valve 13 and the on-off valve 16 correspond to a plurality of valve means of the present invention.

  The hot water passage 14 supplies mixed hot water having a set temperature from the mixing valve 13 to the auxiliary heat source unit 3, and the upstream end of the hot water passage 14 is connected to the hot water outlet of the mixing valve 13, and the downstream end of the hot water passage 14. However, it is connected to the upstream end of the external hot water discharge passage 6 through a drain joint connecting joint 14a having a pressure relief function. In the hot water passage 14, from the upstream side toward the downstream side, a flow rate sensor 14b, a temperature sensor 14c, a pump 15 for sending the mixed hot water to the auxiliary heat source unit 3, a check valve 14d, a pressure sensor for detecting the water pressure. 14e and the anti-freezing heater 14f are installed in this order.

  As described above, the hot water / water mixing device 1 mixes the high temperature water from the hot water passage 12 connected to the solar water heater 2 and the low temperature water from the water supply passage 11 connected to the water supply source through the mixing valve 13. The mixed hot water adjusted to the set temperature by 13 is discharged to the auxiliary heat source unit 3 via the hot water passage 14.

Next, the control unit 20 will be described.
The hot and cold water mixing device 1 is controlled by the control unit 20. Detection signals from various sensors are transmitted to the control unit 20, and the control unit 20 controls the operation of the hot and cold water mixing device 1, the operation / stop of the pump 15, the switching of the open / close states of various valve means, and the opening degree adjustment. Then, various operations (hot water supply operation, drainage operation, etc.) are executed.

  The control unit 20 is capable of data communication with the auxiliary side control unit 3a of the auxiliary heat source unit 3. The control unit 20 can perform data communication with the operation remote controller 8 that can be operated by the user and the auxiliary control unit 3a. When various operations are set by operating the operation remote controller 8, the command signal is transmitted from the operation remote controller 8 to the control unit 20. For example, when the target hot water set temperature is set by operating the switch of the operation remote controller 8, the target hot water set temperature data is transmitted from the operation remote controller 8 to the control unit 20. The control unit 20 corresponds to a drain operation control means.

Next, drainage operation control of the hot and cold water mixing apparatus 1 related to the present invention will be described.
The hot and cold water mixing device 1 has a drainage mode in which a plurality of valve means (mixing valve 13, on-off valve 16 and the like) are set at drainage positions by performing a power reset that temporarily stops and restarts power supply. . Specifically, when the power supply reset is detected, the control unit 20 provided in the hot water / water mixing device 1 communicates with the auxiliary heat source unit 3, and when this communication signal is not detected, the control unit 20 shifts to the drainage mode. However, when a communication signal is detected, it is possible to execute drainage operation control that performs normal control without shifting to the drainage mode.

  Next, drainage operation control for draining the hot and cold water mixing apparatus 1 that is automatically executed by the control unit 35 when the power source is reset will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. This drainage operation control program is stored in the control unit 20 in advance.

  In the flowchart of FIG. 2, when this control is started, first, in S1, the control unit 20 determines whether or not the power is reset by a reset operation of turning the power off and then on. When the determination is made, the determination of S1 is Yes, the process proceeds to S2, and if the determination of S1 is No, S1 is repeated. The reset operation is manually executed through plugging / unplugging of the outlet, operation of a switch of the control unit 20, or the like.

  In addition, when draining the hot / cold water mixing device 1, before resetting the power source, first, the auxiliary heat source device 3 installed on the downstream side of the hot water / water mixing device 1 is drained, and the power source of the auxiliary heat source device 3 is removed. Is turned off, and the drain plugs of the plurality of joints with drain plugs 11a, 12a, 14a of the hot water mixing apparatus 1 are set to open states, and most of the water supply passage 11, the hot water passage 12, and the hot water passage 14 are set. Drain the water in advance.

  Next, in S2, the control unit 20 performs communication with the auxiliary heat source unit 3, and proceeds to S3. Next, in S3, the control unit 20 determines whether or not a communication signal is received from the auxiliary heat source unit 3, and when the communication signal is detected, that is, the auxiliary heat source unit 3 is in a normal use state. If there is data communication between the hot water mixing apparatus 1 and the auxiliary heat source unit 3, the determination in S3 is Yes, the process proceeds to S4, the normal control is performed without shifting to the drainage mode, and the process returns. If the power is turned off after draining the auxiliary heat source unit 3 and no communication signal is detected from the auxiliary heat source unit 3, the determination in S3 is No and the process proceeds to S5.

  Next, in S5, it is determined whether or not a communication standby setting time t1 (for example, 30 seconds) has elapsed. If the communication standby setting time t1 has elapsed, the determination in S5 is Yes, and the process proceeds to S6. If the determination of S5 is No, S2 and S3 are repeated. That is, when the auxiliary heat source unit 3 is turned off and no communication signal is detected from the auxiliary heat source unit 3 during the communication standby set time t1, the hot water / water mixing device 1 shifts to the drainage mode without performing normal control. To do.

  Next, in S6, the control unit 20 performs a position reset of the mixing valve 13 (for example, moves the valve body of the mixing valve 13 to the water side fully open position) as a preparation stage for draining, and proceeds to S7. Next, in S7, it is determined whether or not the valve body of the mixing valve 13 has moved to the reset position. If the valve body of the mixing valve 13 has moved to the reset position, the mixing valve 13 is in a normal state. , S7 is Yes, and the process proceeds to S8.

  If the valve body of the mixing valve 13 is not moved to the reset position, the mixing valve 13 is in a failure state, so the determination in S7 is No, and the process proceeds to S9, where the mixing valve 13 is in error. The notification is notified to the user through, for example, lighting or blinking of the plurality of LEDs of the control unit 20, and the series of controls is terminated.

  Next, in S8, the control unit 20 sets the mixing valve 13 to the hot water side fully open position and proceeds to S10. The control unit 20 sets the on-off valve 16 to an open state and proceeds to S11. 20 sets and drives the pump 15 to a predetermined rotation speed (for example, 3000 rpm when the maximum rotation speed is 4200 rpm), and the process proceeds to S12.

  Next, in S12, the control unit 20 determines whether or not a set time t2 (for example, 2 seconds) has elapsed. If the set time t2 has elapsed, the determination in S12 is Yes, and the process proceeds to S13. If the determination in S12 is No, S12 is repeated. That is, the hot water remaining in the hot water passage 12 is drained during the set time t2.

  Next, in S13, the control unit 20 sets the mixing valve 13 to the water side full open, proceeds to S14, and the control unit 20 determines whether or not a set time t3 (for example, 10 seconds) has elapsed, If the set time t3 has elapsed, the determination in S14 is Yes, the process proceeds to S15, and if the determination in S14 is No, S14 is repeated. That is, the low temperature water remaining in the water supply passage 11 is drained during the set time t3.

  Next, in S15, the control unit 20 sets the mixing valve 13 to the neutral position (all port open), proceeds to S16, determines whether or not a set time t4 (for example, 5 seconds) has elapsed, If the set time t4 has elapsed, the determination in S16 is Yes, the process proceeds to S17, and if the determination in S16 is No, S16 is repeated. That is, the water remaining in the hot and cold mixing device 1 is completely drained during the set time t4.

  In S17, the control unit 20 sets the on-off valve 16 to the closed state, stops driving the pump 15, ends the drainage mode, and ends a series of controls. In addition, after draining of the hot / cold water mixing device 1 is completed by the drainage operation control, the outlet of the hot / cold water mixing device 1 is disconnected to turn off the power.

Next, the operation and effect of the hot and cold mixing device 1 of the present invention will be described.
The hot / cold water mixing device 1 is communicably connected to the auxiliary heat source unit 3 and performs communication with the auxiliary heat source unit 3 when a power reset is detected. If this communication signal is not detected, the hot water mixing device 1 shifts to the drainage mode. Since the control unit 20 (drainage operation control means) is provided, when the reset of the power supply is detected, the system does not immediately shift to the drainage mode, but checks the presence / absence of communication with the auxiliary heat source unit 3 and then shifts to the drainage mode. The drainage operation control can be executed.

  Therefore, when the communication signal of the auxiliary heat source unit 3 is not detected when the power is reset, the control unit 20 drains the auxiliary heat source unit 3 installed on the downstream side of the hot water mixing apparatus 1, and the auxiliary heat source unit 3 When the power source is turned off, the hot water / water mixing device 1 can be surely drained by shifting the hot water / water mixing device 1 to the drainage mode and executing the drainage operation.

  In addition, since the communication signal is transmitted from the auxiliary heat source unit 3 in the normal use state at the time of recovery from the power failure, the control unit 20 determines whether or not there is communication with the auxiliary heat source unit 3. By doing so, water can be drained with a certain distinction between power reset and power failure recovery.

  Furthermore, when the communication signal is detected, the control unit 20 performs normal control without shifting to the drainage mode. Therefore, when the auxiliary heat source unit 3 is in a normal use state where communication is possible, By performing normal control while preventing the mixing device 1 from shifting to the drainage mode, high temperature hot water can be prevented when the hot water is discharged from the hot water supply destination.

Next, a mode in which the above embodiment is partially changed will be described.
[1] The hot water mixing apparatus 1 of the above embodiment mixes the low temperature water from the external water supply passage 4 connected to the water supply source with the high temperature water from the external hot water passage 5 connected to the solar water heater 2, and has a set temperature. Although it is installed so that the mixed hot water is discharged to the auxiliary heat source unit 3 via the external hot water passage 5, it is not particularly limited to this installation structure. For example, instead of the solar water heater 2, a heat pump type heat source unit A hot water storage hot water supply apparatus having a hot water storage tank for storing high temperature water heated by the above may be applied, and the appliance for supplying high temperature water to the hot water mixing apparatus 1 can be appropriately changed.

[2] The hot water / water mixing device 1 of the above embodiment is not particularly limited to this structure as long as it has a function of mixing hot water and low temperature water and discharging hot water at a set temperature. It can be changed. For example, the pump 15 is not necessarily required, and may be omitted as long as the hot water supply pressure to the auxiliary heat source unit 3 can be sufficiently secured.

  Further, for example, two flow rate adjusting valves may be installed instead of the mixing valve 13 of the above embodiment. That is, a flow rate adjusting valve may be installed in each of the water supply passage 11 and the hot water passage 12. According to this structure, when executing the drainage operation control, in the flowchart of the drainage operation control, in S9, the flow rate adjustment valve on the hot water passage 12 side is opened with the flow rate adjustment valve on the water supply passage 11 side closed, and S13 Then, the flow rate adjustment valve on the hot water passage 12 side is closed with the flow rate adjustment valve on the water supply passage 11 side opened, and in S15, the flow rate adjustment valves on both the water supply passage 11 and the hot water passage 12 are opened. Set.

[3] In the drainage operation control of the above embodiment, the various set times t1 to t4 and the rotation speed of the pump 15 are merely examples, and can be changed as appropriate.

[4] In addition, those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention, and the present invention includes such modifications. It is.

DESCRIPTION OF SYMBOLS 1 Hot water mixing apparatus 3 Auxiliary heat source machine 13 Mixing valve 16 On-off valve 20 Control unit (drainage operation control means)

Claims (2)

A hot and cold water mixing device that mixes high and low temperature water with an auxiliary heat source device to generate hot water at a set temperature, and includes a plurality of valve means, and temporarily stops and restarts power supply In the hot and cold water mixing device provided with a drainage mode for setting the plurality of valve means to the drainage position by resetting,
When connected to the auxiliary heat source device so as to be communicable and when the power supply reset is detected, communication with the auxiliary heat source device is performed, and when this communication signal is not detected, the drain operation control shifts to the drain mode. A hot and cold mixing device characterized by comprising means. 2. The hot and cold water mixing apparatus according to claim 1, wherein when the communication signal is detected, the drain operation control means performs normal control without shifting to the drain mode.