JP2015209984A - Hot water mixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide, in a hot water mixing device, one unit in which a high hot water pressure and a water supply pressure can be detected at a low cost and easily; and the other unit enabling it to be easily judged whether or not a pressure difference between the high hot water pressure and the water supply pressure is kept in a set range.SOLUTION: A hot water mixing device 1 in which hot temperature water got from a hot water passage 12 and low temperature water got from a water supply passage 11 are mixed to each other through a mixing valve 13 to cause hot water of set temperature to be fed is constituted in such a way that the device 1 has a pressure sensor 21 for use in detecting a water pressure installed at a hot water discharging passage 14 at a downstream side of the mixing valve 13, a water supplying pressure of low temperature water flowing at the hot water discharging passage 14 is detected under a state in which the hot water passage 12 at the mixing valve 13 is closed and at the same time a high hot water pressure of high hot water flowing at the hot water discharging passage 14 is detected under a state in which the water supply passage 11 of the mixing valve 13 is closed, and the device 1 has a control unit 16 for judging it, on the basis of these detected signals, whether or not a pressure difference between the water supply pressure and the high hot water pressure is kept in a set range and at the same time for informing this result of judgement through informing means.

Description

  The present invention relates to a hot and cold water mixing device, and in particular, detects the pressure of high-temperature water (water head pressure) supplied from a solar water heater and the supply pressure of low-temperature water supplied from a water supply source to determine whether the pressure difference is within a set range. It relates to what can be determined.

  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 a heat collecting panel and a storage tank are integrally installed on the roof, a tank separation type in which a heat collecting panel is installed on the roof, and a storage tank is installed on the ground, etc. Is in practical use. In the tank-integrated solar water heater, water is heated by natural circulation between the heat collection panel and the storage tank by convection.

  In the solar water heater described above, the high-temperature water heated by the heat collecting panel and stored in the storage tank is discharged through a hot water supply device (auxiliary heat source device) installed on the ground side. Generally, between the solar water heater and the hot water heater, 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, and then sent to the water heater. A hot water mixing device is installed. Various hot water and water mixing devices for mixing this type of high temperature water and low temperature water are disclosed in various documents.

  For example, Patent Literature 1 discloses a hot water mixing apparatus that mixes high temperature water heated by a hot water supply device with low temperature water from a water source. In this hot water mixing apparatus of Patent Document 1, a pressure sensor is installed in each of a hot water supply channel connecting a hot water supply device and a mixing valve, and a water supply channel connecting a water supply source and a mixing valve. It has a function of detecting the water pressure and the water supply pressure in the water supply channel, and adjusting the mixing valve in accordance with the amount of change in the pressure ratio to suppress fluctuations in the mixed hot water temperature.

JP-A-5-40531

  However, solar water heaters are installed on the roof, and the installation height varies depending on the building, but hot water mixing devices are often installed on the ground side lower than the roof. The pressure of the high temperature water supplied from the vessel to the hot water mixing device varies depending on the construction site. On the other hand, the supply pressure of the low-temperature water supplied from the water supply source is often reduced to a predetermined pressure by a pressure reducing valve installed in advance in the hot and cold water mixing device, and is not easily affected by the construction site.

  For this reason, depending on the construction site, the pressure difference between the supply pressure of the low-temperature water supplied to the mixing valve of the hot-water mixing device and the high-temperature water pressure of the high-temperature water becomes large, and the mixing performance of the mixing valve deteriorates, resulting in problems. There is a problem. Conventionally, when the pressure difference between the high-temperature water pressure and the feed water pressure is not within the range suitable for the mixing valve, the worker removes the installed pipe and manually measures each pressure using a pressure measuring instrument. Since it is necessary, there is a problem that the work is troublesome and the cost is high.

  Moreover, although the hot water mixing apparatus of patent document 1 has each detected the feed water pressure and the high temperature water pressure with the pressure sensor for exclusive use, since a pressure sensor is expensive, two pressure sensors are added to the hot water mixing apparatus. If incorporated, there is a problem that the production cost increases. The hot water mixing means of this patent document 1 is installed on the downstream side of the hot water heater, and always controls the mixing valve based on detection signals from the two pressure sensors during hot water supply operation, but from the solar water heater during construction and maintenance The function of judging the pressure difference between the hot water pressure of the water and the feed water pressure from the water source is not provided.

  An object of the present invention is to provide a hot and cold water mixing device that can detect a high-temperature water pressure and a feed water pressure at low cost and easily, and whether or not the pressure difference between the high-temperature water pressure and the feed water pressure is within a set range. It is possible to provide a device that can easily determine the above.

  The hot and cold mixing device according to claim 1 is a hot and cold mixing device that mixes hot water from a hot water passage and low temperature water from a water supply passage through a hot and cold mixing portion to discharge hot water at a set temperature. Pressure detection means for detecting water pressure is provided in the downstream hot water passage, and the pressure detection means is used to adjust the supply pressure of the low-temperature water flowing through the hot water passage in a state where the hot water passage side of the hot water mixing section is closed. Detecting and detecting the high-temperature water pressure of the high-temperature water flowing through the hot-water supply passage in a state where the water-supply passage side of the hot-water mixing unit is closed, and the pressure between the water supply pressure and the high-temperature water pressure based on these detection signals A pressure difference determination control means for determining whether or not the difference is within a set range and notifying the determination result via a notification means is provided.

  According to a second aspect of the present invention, there is provided the hot water mixing apparatus according to the first aspect, wherein the hot water passage is connected to a storage tank of a solar water heater installed on the roof.

  According to the first aspect of the present invention, the hot and cold water mixing device detects the feed water pressure and the high temperature water pressure by the pressure detecting means provided in the outlet hot water passage on the downstream side of the hot water and water mixing section, respectively. The pressure difference determination control means for determining whether or not the pressure difference is within the set range and notifying the determination result via the notification means is provided by the pressure difference determination control means during construction or maintenance. If the pressure difference between the feed water pressure and the high-temperature water pressure is within the set range, and if it is determined that the pressure difference is abnormal, the worker uses the pressure reducing valve or orifice to Can be adjusted appropriately.

  Therefore, by detecting the water supply pressure and the high-temperature water pressure respectively by the pressure detection means, it is not necessary for the operator to remove the installed piping and measure each pressure using a pressure measuring instrument. It is possible to realize detection of both high-temperature water pressure and feed water pressure with a simple method and an easy structure. Since the determination result is notified through the notification means, the worker can easily determine whether or not the pressure difference is within the set range.

  In addition, by installing pressure detection means in the hot water passage downstream of the hot water mixing section and alternately closing the hot water passage and the feed water passage, both the feed water pressure and the hot water pressure are detected. Compared with the case where dedicated pressure detection means are respectively installed in the hot water passage, the feed water pressure and the high temperature water pressure can be detected at a low cost.

  According to the invention of claim 2, since the hot water passage is connected to the storage tank of the solar water heater installed on the roof, the hot water of the hot water of the solar water heater that changes extremely according to the construction site It is possible to provide a hot and cold water mixing device corresponding to pressure detection.

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 pressure difference determination 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 mixing apparatus 1 mixes the high temperature water heated by the solar water heater 2 with the low temperature water supplied from the water supply source, adjusts the temperature to the set temperature, and then sends the hot water to the water heater 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 water heater 3 installed on the ground side.

  The solar water heater 2 is a known tank-integrated solar water heater 2 including a heat collecting panel 2a and a storage tank 2b, which are integrally configured. The water heater 3 is a burner or heat exchanger. It is a well-known combustion type hot water supply device incorporating a heater and 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 hot water heater 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 circulation pump 15 for sending the mixed hot water to the hot water heater 3, a control unit 16, and the like are provided, and these are housed in an exterior case 17.

  The water supply passage 11 supplies the mixing valve 13 with low-temperature water supplied from a water supply source via a pressurized systern, and the upstream end of the water supply passage 11 is connected to the external water supply passage 7 via a connection joint 11a with a filter. Connected to the downstream end, the downstream end of the water supply passage 11 is connected to 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 downstream end of the external hot water passage 5 via a connection joint 12 a with a filter. The downstream end of the hot water passage 12 is connected to the mixing valve 13. In the hot water passage 12, an antifreezing heater 12b, a check valve 12c, and a temperature sensor 12d are installed in this order from the upstream side to the downstream side.

  The mixing valve 13 (corresponding to the hot water mixing section) is a known mixing valve that controls the mixing ratio of high temperature water and low temperature water so that the temperature of the hot water becomes the command temperature (set temperature). The mixing valve 13 is configured to discharge hot water at a set temperature if the pressure difference between the high-temperature water pressure and the low-temperature water pressure is within a range of 50 kPa, for example.

  The hot water passage 14 supplies mixed hot water having a set temperature from the mixing valve 13 to the hot water supply device 3, the upstream end of the hot water passage 14 is connected to the mixing valve 13, and the downstream end of the hot water passage 14 is connected with a drain plug. It is connected to the downstream end of the external hot water passage 6 through a joint 14a. In the hot water supply passage 14 on the downstream side of the mixing valve 13, a flow rate sensor 14 b, a temperature sensor 14 c, a circulation pump 15 for sending the mixed hot water to the hot water heater 3, a check valve 14 d, water pressure from the upstream side to the downstream side A pressure sensor 21 (corresponding to a pressure detection means) for detecting the above and an anti-freezing heater 14e are sequentially installed.

  A bypass passage 18 branched from the downstream side of the pressure reducing valve 11 d of the water supply passage 11 is connected to the upstream side of the circulation pump 15 of the hot water passage 14. The bypass passage 18 is provided with a solenoid valve 19 for avoiding high temperature hot water.

  As described above, the hot water mixing apparatus 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 to set temperature. The hot water is discharged to the water heater 3.

Next, the control unit 16 will be described.
The hot water / water mixing device 1 is controlled by a control unit 16. Detection signals of various sensors are transmitted to the control unit 16, and the control unit 16 controls the operation of the hot and cold water mixing device 1, the operation / stop of the circulation pump 15, the switching of the open / close states of various valves, and the opening degree adjustment. Then, various operations (hot water supply operation, pressure difference determination operation, etc.) are executed.

  The control unit 16 can communicate data with the operation remote controller 8 that can be operated by the user via the water heater side control unit 3a of the water heater 3, and various operations are set by operating the switch of the operation remote controller 8. Then, the command signal is transmitted from the operation remote controller 8 to the control unit 16. 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 16. The control unit 16 corresponds to a pressure difference determination control unit.

Next, the pressure difference determination operation control related to the present invention will be described.
The control unit 16 detects the supply pressure of the low-temperature water flowing through the hot water passage 14 with the pressure sensor 21 closed at the time of construction or maintenance, and the water supply passage 11 of the mixing valve 13. The high-temperature water pressure of the high-temperature water flowing through the tap water passage 14 with the side closed is detected, and it is determined whether or not the pressure difference between the feed water pressure and the high-temperature water pressure is within the set range based on these detection signals. At the same time, it is possible to execute pressure difference determination operation control for notifying the determination result via the notification means.

  Next, the pressure difference determination operation control that is automatically executed by the control unit 16 when the hot water / water mixing device 1 is trial-run after being installed will be described based on the flowchart of FIG. In the figure, the symbol Si (i = 1, 2,...) Indicates each step. A control program for the pressure difference determination operation control is stored in the control unit 16 in advance.

  In the flowchart of FIG. 2, when this control is started, first, in S1, the control unit 16 issues a hot water tap opening instruction. In this stage of S1, for example, a notification for urging the operator to open the hot-water tap 9 is given via the display or sound of the operation remote controller 8.

  Next, in S2, it is determined whether or not the hot water tap 9 has been opened by the operator, and if it is determined that the hot water tap 9 has been opened based on the detection signal or the like of the flow sensor 14b, the determination in S2 is Yes, and S3 When the determination of S2 is No, S2 is repeated.

  Next, in S3, the control unit 16 closes the hot water passage 12 side of the mixing valve 13 and sets the state where the water supply passage 11 and the hot water passage 14 are connected. It is determined whether or not a time during which the flow rate of the passage 14 is stabilized (for example, 5 seconds) has elapsed. If the set time has elapsed, the determination of S4 is Yes, the process proceeds to S5, and the determination of S4 is Repeat S4.

  Next, in S5, the detection signal of the pressure sensor 21 is read, and on the basis of this detection signal, the control unit 16 supplies the low-pressure water supply pressure flowing through the tap water passage 14 with the hot water passage 12 side of the mixing valve 13 closed. Pa [kPa] is calculated, and the process proceeds to S6.

  Next, in S6, the control unit 16 closes the water supply passage 11 side of the mixing valve 13 and sets the hot water passage 12 and the hot water passage 14 in a connected state, and proceeds to S7, and the set time has elapsed. If the set time (the time for which the flow rate is stabilized, for example, 5 seconds) has elapsed, the determination in S7 is Yes, the process proceeds to S8, and if the determination in S7 is No, S7 is repeated.

  Next, in S8, the detection signal of the pressure sensor 21 is read, and on the basis of this detection signal, the control unit 16 uses the hot water of the high-temperature water flowing through the tap water passage 14 with the water supply passage 11 side of the mixing valve 13 closed. The pressure Pb [kPa] is calculated, and the process proceeds to S9.

  Next, in S9, it is determined whether or not the pressure difference | Pa−Pb | between the feed water pressure Pa and the high temperature water pressure Pb is within a set range α (for example, 50 kPa). If the determination in S9 is Yes, that is, if the pressure difference is within the set range, the process proceeds to S10 and the normal pressure difference that is the determination result is notified to the user via the display of the operation remote controller 8, voice, or the like. Alternatively, the user is notified through lighting and blinking of the plurality of LEDs of the control unit 16, and then the warm water passage 12 side of the mixing valve 13 is returned to the closed state, and the series of control is finished.

  However, if the determination in S9 is No, that is, if the pressure difference is not within the set range, the process proceeds to S11, and the pressure difference abnormality that is the determination result is notified to the user via the display of the operation remote controller 8, voice, or the like. Or the user is notified through lighting or blinking of the plurality of LEDs of the control unit 16, and then the warm water passage 12 side of the mixing valve 13 is returned to the closed state, and the series of control is finished.

  At the same time that the pressure difference normal state or the pressure difference abnormal state is notified, the water supply pressure Pa, the high-temperature water pressure Pb, and the value of the pressure difference may be displayed on the liquid crystal of the operation remote controller 8 or the like. The display and sound of the operation remote controller 8 and the lighting and flashing of the plurality of LEDs of the control unit 16 correspond to the notification means.

  Then, after notifying that the pressure difference is abnormal in S11 after the pressure difference determination operation control is finished, the operator can use the external water supply passage 7, the filter-attached joint 11a, the external hot water passage 5, the filter-attached joint, or the like. The pressure difference between the water supply pressure Pa and the high-temperature water pressure Pb is adjusted to be within the set range by attaching a pressure reducing valve, an orifice, or the like to 12a.

Next, the operation and effect of the hot and cold mixing device 1 of the present invention will be described.
The hot water mixing apparatus 1 detects the feed water pressure and the high temperature water pressure by the pressure sensor 21 provided in the outlet hot water passage 14 on the downstream side of the mixing valve 13, respectively, and the pressure difference between the feed water pressure and the high temperature water pressure is within the set range. And a control unit 16 for notifying the determination result via the notification means, and at the time of construction or maintenance, the control unit 16 (pressure difference determination control means) Judge whether the pressure difference from the high-temperature water pressure is within the set range, and if it is judged that the pressure difference is abnormal, the worker should adjust the pressure difference using the pressure reducing valve or orifice. Can do.

  Therefore, by detecting the water supply pressure and the high-temperature water pressure by the pressure sensor 21, it is not necessary for the worker to remove the installed piping and measure each pressure using a pressure measuring instrument. It is possible to realize detection of both high-temperature water pressure and feed water pressure with a simple method and an easy structure. Since the determination result is notified through the notification means, the worker can easily determine whether or not the pressure difference is within the set range.

  Moreover, since the pressure sensor 21 is installed in the tap water passage 14 on the downstream side of the mixing valve 13 and the hot water passage 12 and the water supply passage 11 are alternately closed, both the water supply pressure and the high temperature water pressure are detected. Compared with the case where dedicated pressure detection means are installed in the water supply passage 11 and the hot water passage 12, respectively, the water supply pressure and the high temperature water pressure can be detected at a low cost.

  Furthermore, since the hot water passage 12 is connected to the storage tank 2b of the solar water heater 2 installed on the roof, detection of the high-temperature water pressure of the hot water of the solar water heater 2 that changes extremely according to the construction site. Can be provided.

Next, a mode in which the above embodiment is partially changed will be described.
[1] Instead of the mixing valve 13 of the above-described embodiment, two on-off valves (corresponding to a hot water mixing unit) may be installed. That is, when the on-off valves are respectively installed in the water supply passage 11 and the hot water passage 12 and the pressure difference determination operation control is executed, the supply of low-temperature water flowing through the hot water passage 14 with the on-off valve on the hot water passage 12 side closed. You may make it detect the high-temperature water pressure of the high temperature water which flows through the hot-water supply channel | path 14 in the state which detected the pressure and closed the on-off valve by the side of the feed water passage 11.

[2] In the pressure difference determination operation control of the above embodiment, the mixing valve 13 is automatically switched after the set time has elapsed. However, it is not particularly limited to this switching control, and the operator operates the operation remote controller 8 or the like. Alternatively, the mixing valve 13 may be switched, or the mixing valve 13 may be switched when the flow rate sensor 14b determines that the flow rate is stable.

[3] The pressure difference determination operation control of the above embodiment is automatically executed by the control unit 16 when the trial operation is performed after the hot water / water mixing apparatus 1 is installed. It may be executed manually via the above operation, the switch operation of the control unit 16 or the like.

[4] In the pressure difference determination operation control of the above embodiment, both the feed water pressure and the high-temperature water pressure are detected by dynamic pressure, but it is not particularly limited to dynamic pressure detection. 9 may be closed and detected by static pressure. That is, in the flowchart of FIG. 2, the hot water tap 9 is closed between S4 and S5, the static water pressure is detected in S5, the hot water tap 9 is opened between S5 and S6, and the pressure is released. The hot water tap 9 is closed again between S8 and S8, and the static high pressure water pressure is detected in S8, so that both the feed water pressure and the high temperature water pressure are detected by static pressure, and the pressure difference is determined from these. It may be calculated.

[5] In addition, those skilled in the art can implement the present invention in various forms with 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 2 Solar water heater 2b Storage tank 11 Water supply path 12 Hot water path 13 Mixing valve 14 Hot water path 15 Circulation pump 16 Control unit 21 Pressure sensor

Claims (2)

In a hot and cold water mixing device for mixing hot water from a hot water passage and low temperature water from a water supply passage through a hot and cold mixing section to discharge hot water at a set temperature,
A pressure detecting means for detecting the water pressure in the hot water outlet downstream of the hot water mixing section;
The pressure detection means detects the supply pressure of the low-temperature water flowing through the hot water passage while the hot water passage side of the hot water mixing portion is closed, and closes the water supply passage side of the hot water mixing portion. The high temperature water pressure of the high temperature water flowing through the hot water passage is detected, and based on these detection signals, it is determined whether or not the pressure difference between the feed water pressure and the high temperature water pressure is within a set range, and this determination result An apparatus for mixing hot water and water, comprising pressure difference determination control means for informing through a notification means. The hot / cold water mixing apparatus according to claim 1, wherein the hot water passage is connected to a storage tank of a solar water heater installed on a roof.