JP6696158B2 - Water heater - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water device including a pilot-type solenoid valve in a circulation circuit, and more particularly to a hot water device that can eliminate clogging of a pilot-type solenoid valve.

  In a conventional hot water device having a pilot-type solenoid valve in a circulation circuit, it has been found that part of the cause of the error in the circulation circuit is a failure of the pilot-type solenoid valve. The main causes of failure of the pilot-type solenoid valve are disconnection of the electromagnetic coil that drives the plunger, and clogging due to foreign matter being caught or stuck between the pilot valve and the pilot port.

  Such clogging occurs also in the hot water supply device, and Patent Document 1 discloses a technique of repeatedly opening and closing the bathtub pouring valve when the bathtub pouring valve is clogged and the filling operation is not stopped. ..

JP, 2008-82636, A

  However, with respect to the entrapment and sticking of foreign matter between the pilot valve and the pilot port, reproducibility is poor, and currently, no preventive measures are taken and it is difficult to avoid. Further, in the technique of Patent Document 1, when repeating opening and closing, the valve that has been clogged has only the weak water pressure that is pushed out from the hot water storage tank by the water supply pressure that reduces the tap water pressure, and the effect of eliminating the clog is obtained. small.

  An object of the present invention is to provide a hot water system having a pilot type solenoid valve in a circulation circuit and having a control means capable of eliminating clogging of the pilot type solenoid valve.

The hot water apparatus according to claim 1 has a circulation circuit in which a circulation pump and a pair of parallel passages each having a heat exchanger and a pilot-type electromagnetic on-off valve are connected by piping, and detects the flow rate flowing through the circulation circuit. in warm water system Ru provided with a flow detection means for, by opening the pilot solenoid on-off valve provided in one of the parallel passage, the circulation flow rate sensed by the flow sensing means upon driving the circulation pump is the When the flow rate is equal to or lower than the specified flow rate, the pilot type solenoid on-off valve provided in the other parallel passage is opened, and when the circulation flow rate is equal to or higher than the specified flow rate, the one provided in the one parallel passage. The pilot type solenoid valve is characterized by driving the electromagnetic coil so that the plunger repeatedly moves forward and backward.

According to a second aspect of the present invention, in the first aspect , the hot water device is provided with a hot water storage tank, and the hot water stored in the hot water storage tank is circulated.

The hot water apparatus according to claim 3 is, in claim 1 or 2 , wherein when the plunger of the pilot-type solenoid valve drives the electromagnetic coil so that the plunger repeatedly moves forward and backward, the circulating pump is repeatedly driven and stopped. It is characterized in that the pilot type solenoid valve is controlled to open and close during driving.

According to the invention of claim 1 , when the flow rate of one of the parallel passages is equal to or less than the specified flow rate, it is confirmed that the other parallel passage normally flows, and the abnormality occurrence is specified to be the one parallel passage, By driving the plunger of the pilot type electromagnetic on- off valve in one of the parallel passages in which an abnormality has occurred to move forward and backward, it is possible to eliminate clogging due to foreign matter being caught in the pilot port or sticking of the pilot valve.

According to the second aspect of the present invention, the hot water stored in the hot water storage tank is circulated in the circulation circuit, so that the scale or the like accumulated in the hot water storage tank causes the clogging of the pilot type solenoid on- off valve provided in the circulation circuit. Even if the plunger of the pilot type electromagnetic on- off valve is driven back and forth, it is possible to eliminate clogging due to foreign matter being caught in the pilot port and sticking of the pilot valve.

According to the invention of claim 3, while the time of forward and backward driving the plunger of the pilot solenoid on-off valve in order to eliminate the clogging of the pilot solenoid on-off valve, the circulation pump is hot water flows through the circulation circuit to drive to the plunger drive so as pilot solenoid on-off valve is closed, then since pilot solenoid off valve plunger to open is driven by the water flow and water pressure with the driving of the plunger driven by the circulation pump, pilot it is possible to eliminate the clogging of the solenoid valve.

It is a schematic block diagram which shows the hot water apparatus of this invention. It is a sectional view of the important section showing the closed state of a pilot type solenoid valve. It is a sectional view of the important section showing the opened state of a pilot type solenoid valve. It is a figure which shows a bath heating operation. It is a figure which shows hot water heating operation. It is a figure which shows the hot water heating operation using the hot water of a hot water storage tank. 3 is a flowchart of the circulating circuit monitoring control of the first embodiment. 7 is a flowchart of a circulating circuit monitoring control of the second embodiment. It is a timing chart of the retry operation in the circulation circuit monitoring control.

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

A hot water storage and hot water supply apparatus M including a hot water apparatus 1 of the present invention will be described with reference to FIG.
The hot water storage and hot water supply apparatus M is composed of a hot water apparatus 1, a bath heating circuit 20, a hot water heating circuit 23, a hot water supply passage 52, and the like, and supplies hot water of the hot water apparatus 1 to a hot water tap or the like.

  The hot water device 1 includes a circulation pump 2, a circulation flow rate sensor 3 (flow rate detection means), an auxiliary heat source device 4, and a circulation circuit 7 in which a heat exchanger unit 5 is annularly connected by piping, and circulation of hot and cold water in the circulation circuit 7 and the like. It has a control unit 9 (control means) for controlling.

  The circulation circuit 7 includes a passage portion 7a that connects the circulation pump 2 and the circulation flow rate sensor 3, a passage portion 7b that connects the circulation flow rate sensor 3 and the hot and cold water inlet of the auxiliary heat source device 4, and a hot water and hot water outlet of the auxiliary heat source device 4. It has a passage portion 7c connecting the exchanger portion 5, a passage portion 7d connecting the heat exchanger portion 5 and the three-way valve 8, and a passage portion 7e connecting the three-way valve 8 and the circulation pump 2. By driving the circulation pump 2 and opening the pilot type solenoid valve 15 (18) of the heat exchanger unit 5, the hot and cold water heated by the auxiliary heat source device 4 circulates in the circulation circuit 7.

  The auxiliary heat source device 4 has, for example, a sensible heat recovery heat exchanger 4a and a latent heat recovery heat exchanger 4b, and the sensible heat and latent heat of the combustion gas generated by the combustion of the hot water and the fuel gas flowing through the circulation circuit 7 Heat is exchanged between the hot water and the hot water.

The heat exchanger part 5 is provided with a plurality of parallel passage parts 13 and 16 forming a parallel passage of the circulation circuit 7, and the parallel passage part 13 has a bath heating heat exchanger 14 and a bath heating on-off valve 15 Are provided in series, and the heat exchanger 17 for hot water heating and the open / close valve 18 for hot water heating are provided in series in the parallel passage portion 16. For the bath heating on-off valve 15 and the hot water heating on-off valve 18, pilot type electromagnetic on- off valves that open and close by utilizing the differential pressure of hot water flowing are used.

  The bath heating heat exchanger 14 heats the bath water flowing in the bath heating circuit 20 stored in the bath 19 by heat exchange with the hot water flowing in the circulation circuit 7, and is a part of the circulation circuit 7. It has a certain primary side heat exchange passage part 14a and a secondary side heat exchange passage part 14b which is a part of the bath heating circuit 20.

  The hot water heating heat exchanger 17 heats the heating water flowing in the hot water heating circuit 23 by exchanging heat with the hot water flowing in the circulation circuit 7, and is a primary side heat exchange passage which is a part of the circulation circuit 7. It has the part 17a and the secondary side heat exchange passage part 17b which is a part of the hot water heating circuit 23.

Next, the bath heating circuit 20 will be described.
The bath reheating circuit 20 includes a bath circulation pump 21, a heat exchanger outflow passage portion 20a that connects the bath circulation pump 21 and the secondary heat exchange passage portion 14b of the bath heating heat exchanger 14, and a secondary heat source. The bath passage passage portion 20b connects the exchange passage portion 14b and the bathtub 19, and the bath return passage portion 20c connects the bathtub 19 and the bath circulation pump 21. A temperature sensor 22 is provided at the bath passage 20b.

Next, the hot water heating circuit 23 will be described.
The hot water heating circuit 23 includes a heating water circulation pump 24, a heating heat exchanger forward passage portion 23a that connects the heating water circulation pump 24 and the secondary side heat exchange passage portion 17b of the hot water heating heat exchanger 17, and a secondary side heat exchange. The passage portion 17b is connected to a high temperature forward passage portion 23b connected to a hot water heater such as a bathroom dryer, a low temperature forward passage portion 23c connected to a floor heating device, etc., and a heating device and an expansion tank 25 for absorbing expansion of heating water. It has a heating return passage 23d, and a passage 23e connecting the expansion tank 25 and the heating water circulation pump 24. A temperature sensor 26 is provided in the high temperature outgoing passage portion 23b.

  The high-temperature branch passage 23f, which branches from the high-temperature forward passage 23b and is connected to the low-temperature forward passage 23c, has a check valve 27, and branches from the heating heat exchanger forward-passage 23a to the low-temperature forward passage 23c. The low temperature branch passage 23g to be connected has an opening / closing valve 28, and the heating bypass passage 23h which connects the heating high temperature forward passage 23b and the heating return passage 23d has a bypass thermal valve 29. .

Next, the bath heating on-off valve 15 and the hot water heating on-off valve 18 will be described.
As shown in FIG. 2, the bath heating on-off valve 15 and the hot water heating on-off valve 18 include a main body 30, a primary side passage 31, a secondary side passage 32, a primary side passage 31 and a secondary side passage 32. Is a pilot type solenoid valve having a main valve seat 33, a diaphragm 34, a pilot port 35, a pilot valve 36, a plunger 37, a spring 38, an electromagnetic coil 39, a bleed port 40, etc.

  The primary passage 31 is an outer passage and an upper passage of the main valve seat 33 into which hot water flows, and the secondary passage 32 has hot water flowing from the primary passage 31 flowing out through the inner side of the main valve seat 33. It is a passage. A diaphragm 34 is provided above the main valve seat 33 so as to be able to open and close a passage inside the main valve seat 33. An upper end of a pilot port 35 provided at a central portion of the diaphragm 34 has a pilot valve 36 at a lower end of a plunger 37. The plunger 37 is biased downward by the elastic force of a spring 38 provided on the plunger 37.

  The plunger 37 is a magnetic body and is driven upward by energization of a coil 39 surrounding the plunger 37 to compress the spring 38. When the energization of the electromagnetic coil 39 is stopped, the plunger 37 is driven downward by the elastic force of the compressed spring 38. To be done. A bleed port 40 is provided at a position corresponding to the outside of the main valve seat 33 of the diaphragm 34, and hot water is introduced to the upper side of the diaphragm 34.

  As shown in FIG. 2, when the electromagnetic coil 39 is not energized in the closed state, the plunger 37 is located below and the pilot valve 36 closes the pilot port 35 and is filled with hot water introduced from the bleed port 40. The primary side passage including the upper side of the diaphragm 34 is filled with hot water. Due to the pressure of the hot water and the elastic force of the spring 38, the diaphragm 34 is pushed downward to close the secondary passage 32 inside the main valve seat 33, and the bath heating on-off valve 15 or the hot water heating on-off valve 18 is closed. It is in a state.

  When the electromagnetic coil 39 is energized, the plunger 37 is driven upward, the pilot valve 36 is opened, and hot water on the upper side of the diaphragm 34 flows through the pilot port 35 to the secondary side passage 32, pushing the diaphragm 34 downward. Is reduced. Then, the diaphragm 34 is lifted from the main valve seat 33 by the pressure of the hot and cold water in the primary side passage 31, and the primary side passage 31 and the secondary side passage 32 communicate with each other below the diaphragm 34, as shown in FIG. The bath heating on-off valve 15 or the hot water heating on-off valve 18 is in an open state in which a large amount of hot water flows.

  When the energization of the electromagnetic coil 39 is stopped, the elastic force of the spring 38 drives the plunger 37 downward, and the pilot valve 36 closes the pilot port 35. Then, the hot water flowing from the bleed port 40 accumulates on the upper side of the diaphragm 34, and the pressure pushing the diaphragm 34 downward increases. The diaphragm 34 is pushed down by this pressure and the elastic force of the spring 38, and the secondary passage 32 inside the main valve seat 33 is closed. As shown in FIG. 2, the bath heating on / off valve 15 or the hot water heating on / off valve 15 is opened. The valve 18 returns to the closed state.

Next, the hot water storage tank 41 will be described.
As shown in FIG. 1, the hot water device 1 has a hot water storage tank 41. The hot water storage tank 41 is composed of a closed tank capable of storing high-temperature hot water heated by the external heat source device 42, and is heated by the external heat source device circulation pump 43 provided between the external heat source device 42 and the external heat source device 42. It has a hot water storage circulation circuit 44 in which is circulated. The hot water storage circulation circuit 44 is configured such that low temperature hot water is supplied to the external heat source device 42 from the lower end of the hot water storage tank 41, and high temperature hot water heated by the external heat source device 42 is stored in the upper part of the hot water storage tank 41. ing.

  A hot water storage bypass passage 46 configured to be switchable by a three-way valve 45 is provided between the external heat source device 42 and the hot water storage tank 41, and when the heating of the hot water in the external heat source device 42 is insufficient, the hot water storage bypass passage 46 is provided. Reheating by the external heat source device 42 is possible via the. As the external heat source device 42, a heat source device that uses the exhaust heat of the fuel cell power generator, a heat pump type heat source device that uses the heat of the outside air, or the like can be used.

  A plurality of temperature sensors (41a to 41d) are sequentially provided on the outer peripheral portion of the hot water storage tank 41 from the lower side to the upper side at equal intervals, and a plurality of temperature sensors (41a to 41d) are provided inside the hot water storage tank 41. The temperature of hot and cold water in the reservoir can be detected. Although not shown, the periphery of the hot water storage tank 41 is covered with a heat insulating material to prevent the temperature of the stored hot water from falling.

  The water supply passage 47 supplies low-temperature clean water from a water supply source to the hot water storage tank 41, etc., and has an upstream water supply passage portion 47a, an intermediate water supply passage portion 47b, and a downstream water supply passage portion 47c, and the upstream end is upward. It is connected to a water source and the downstream end is connected to the lower end of the hot water storage tank 41. A pressure reducing valve 48 is provided in the upstream water supply passage portion 47a, and a check valve 49 is provided in the intermediate water supply passage portion 47b.

  A bypass passage portion 53 connected to the passage portion 7d of the circulation circuit 7 is branched from between the intermediate water supply passage portion 47b and the downstream water supply passage portion 47c. By this bypass passage portion 53, low-temperature clean water can be supplied to the circulation circuit 7, and conversely, hot water flowing in the circulation circuit 7 is passed from the bypass passage portion 53 through the downstream water supply passage portion 47c to the hot water storage tank. 41 can be introduced.

  The tank hot water passage 54 has an upper outflow hot water passage portion 54 a and a lower outflow hot water passage portion 54 b, the upstream end of which is connected to the upper end of the hot water storage tank 41 and the downstream end of which is connected to the hot water discharge passage 52. The tank passage portion 55 branched from between the upper outflow hot water passage portion 54 a and the lower outflow hot water passage portion 54 b is connected to the three-way valve 8. A check valve 59 is provided in the tank passage portion 55.

  The three-way valve 8 can selectively switch the connection between the passage portion 7d and the passage portion 7e of the circulation circuit 7 or the connection between the tank passage portion 55 and the passage portion 7e. By switching the three-way valve 8 to connect the tank passage portion 55 and the passage portion 7e, the hot and cold water stored in the hot water storage tank 41 can be introduced into the circulation circuit 7. At this time, the auxiliary heat source device 4 is not operated, but it may be operated to heat the hot water.

Next, the hot water supply passage 52 will be described.
The hot water supply passage 52 is for supplying hot and cold water of the hot water supply device 1, hot and cold water stored in the hot water storage tank 41, and hot and cold water heated by the auxiliary heat source device 4 to a desired hot water supply destination, and the downstream end of the tank hot water supply passage 54 is hot water supply. It is connected to the upstream end of the passage 52, and the downstream end of the hot water supply passage 52 is connected to the hot water tap. Further, an auxiliary heat source machine outlet hot water passage 56 branched from the passage portion 7 c of the circulation circuit 7 is connected to the upstream end of the hot water supply passage 52 so that hot water heated by the auxiliary heat source machine 4 can be supplied. An opening / closing valve 57 capable of switching to hot water supply is provided in the auxiliary heat source machine hot water outlet passage 56.

  Further, the hot water supply passage 52 has an upstream hot water supply passage portion 52a through which high-temperature hot water flows, an intermediate hot water supply passage portion 52b through which hot water mixed with clean water flows, and a downstream hot water supply passage portion 52c. The mixing valve 58 is provided between the passage portions 52b. The water supply bypass passage portion 50 branched from between the upstream water supply passage portion 47a and the intermediate water supply passage portion 47b is connected to the mixing valve 58, and the water supply bypass passage portion 50 is provided with a check valve 51.

  In the mixing valve 58, the mixing ratio of the low-temperature clean water from the water supply bypass passage portion 50 and the high-temperature hot water from the upstream hot water supply passage portion 52a is adjusted so as to supply the hot water at the set temperature. A flow rate sensor 60 and a tap water proportional valve 61 are provided in the intermediate hot water supply passage portion 52b. A branch passage portion 62 branched from the water supply bypass passage portion 50 is connected to the intermediate hot water supply passage portion 52b, and the branch passage portion 62 is provided with a high temperature hot water avoidance solenoid valve 63.

  The pouring passage 64 supplies hot water flowing in the hot water supply passage 52 to the bathtub 19, is a downstream side of the hot water supply proportional valve 61, and is branched from between the intermediate hot water supply passage portion 52b and the downstream hot water supply passage portion 52c. It is connected to the bath heating circuit 20. The pouring passage 64 is provided with a flow rate sensor 65, a pouring electromagnetic valve 66, and the like.

Next, the control unit 9 will be described.
The control unit 9 operates the external heat source device 42 in the hot water supply and hot water supply apparatus M to perform hot water storage operation and hot water supply operation, and in the hot water apparatus 1, obtains detection signals from the circulation flow rate sensor 3, the temperature sensor 10, the circulation pump 2 and the like. The operation of the circulation pump 2, the auxiliary heat source device 4, etc., the switching of the open / closed states of the valves at various places, the adjustment of the opening degree, etc. are controlled to execute various operations (bath heating operation, heating operation, etc.).

  The control unit 9 can perform data communication with an operation remote controller (not shown) that can be operated by the user, and when various settings are made by the operation of the operation remote controller, a signal thereof is sent from the operation remote controller to the control unit 9. Sent. For example, when the bath heating operation is set by the operation remote controller, the bath heating set temperature data and the like are transmitted from the operation remote controller to the control unit 9.

Next, the bath heating operation will be described.
As shown in FIG. 4, when the bath heating operation is set by the operation remote controller, the control unit 9 drives the circulation pump 2 in the circulation circuit 7 to cause the hot water to flow through the parallel passage portion 13 so that the bath heating opening / closing valve. 15 is opened and the bath circulation pump 21 is driven in the bath heating circuit 20 to circulate the bath water. The hot and cold water flowing through the circulation circuit 7 is hot and cold water heated by the auxiliary heat source device 4, but it is also possible to circulate the hot and cold water heated by the external heat source device 42 and stored in the hot water storage tank 41.

  The low-temperature bath water enters the bath circulation pump 21 through the bath return passage portion 20c, and flows from the bath circulation pump 21 into the bath heating heat exchanger 14 through the heat exchanger passage passage portion 20a. The high-temperature bath water heated by the heat exchanger 14 for heating returns to the bath 19 through the bath passage 20b. The control unit 9 acquires the temperature of the hot water flowing through the circulation circuit 7 or the temperature of the reheated bath water from the temperature sensor 11 or the temperature sensor 22 and controls the circulation circuit 7 and the bath reheating circuit 20, The bath heating operation is performed so that the bath water reaches a predetermined set temperature.

Next, the hot water heating operation will be described.
As shown in FIG. 5, when the hot water heating operation is set by the operation remote controller, the control unit 9 drives the circulation pump 2 in the circulation circuit 7 to open the hot water heating on-off valve 18 so that hot water flows through the parallel passage portion 16. The heating water circulation pump 24 is driven in the hot water heating circuit 23 while the heating water is circulated while the heating water is opened. Although the hot and cold water flowing through the circulation circuit 7 is hot and cold water heated by the auxiliary heat source device 4, it is also possible to circulate the hot and cold water heated by the external heat source device 42 and stored in the hot water storage tank 41, as shown in FIG.

  The heating water heated by the heat exchanger 17 for hot water heating radiates heat in a heating device such as a bathroom dryer or floor heating device through the high temperature forward passage portion 23b and the low temperature forward passage portion 23c, and passes through the heating return passage 23d and the like. And returns to the hot water heating heat exchanger 17. The control unit 9 obtains the temperature of the hot water flowing through the circulation circuit 7, the temperature of the heated heating water, and the like from the temperature sensor 11 and the temperature sensor 26, and controls the circulation circuit 7 and the hot water heating circuit 23 to generate the heating water. The hot water heating operation is performed so that the temperature becomes the predetermined set temperature.

  Next, the circulation circuit monitoring control of the hot water apparatus 1 of the present invention will be described based on FIG. 7. In the retry operation during the circulation circuit monitoring control, the electromagnetic coil is driven to open / close the pilot type solenoid valve at the timing shown in FIG. 9, and the circulation pump is turned on / off. In addition, Si (i = 1, 2, ...) represents a step.

  When the above-described bath heating operation is started, the control unit 9 drives (ON) the circulation pump 2 to open the bath heating opening / closing valve 15 of the parallel circuit unit 13. The control unit 9 monitors a user's remote control operation, temperature, flow rate, and error occurrence at various places during operation.

  First, in S1, it is determined whether or not the operation is stopped due to operation completion or operation stop operation. When the determination is Yes, the process returns to end the circulation circuit monitoring control, and when the determination is No, the process proceeds to S2.

  Next, in S2, it is determined whether the rotation speed of the circulation pump 2 is out of a predetermined rotation speed range. For example, it is determined whether the rotation speed is out of the range of 200 rpm or more and less than 6500 rpm. If the determination is Yes, the process proceeds to S13, and if the determination is No, the process proceeds to S3.

  Next, in S3, it is determined whether or not the circulation flow rate of the hot water flowing through the circulation circuit 7 is equal to or higher than the specified flow rate. For example, it is determined whether or not the circulation flow rate is equal to or higher than the specified flow rate 1 L / min. If the determination is Yes, the process returns to S1, and if the determination is No, the process proceeds to S4.

  Next, in S4, the number N of retry operations that attempts to make the circulation flow rate of the circulation circuit 7 equal to or more than the specified flow rate is set to 0 (initial value), and the process proceeds to S5.

  In S5 to S7, the circulation pump 2 is in the ON state, and the open or close of the bath heating on-off valve 15 is maintained for a predetermined time. In S5, the open state of the bath heating on-off valve 15 is maintained for 10 seconds, for example, and the process proceeds to S6. Next, in S6, the closed state of the bath heating on-off valve 15 is maintained for 2 seconds, for example, and the process proceeds to S7. Next, in S7, the open state of the bath heating on-off valve 15 is maintained for, for example, 3 seconds, and the process proceeds to S8. Next, in S8, the number N of retry operations is increased by 1, and the process proceeds to S9.

  Next, in S9, it is determined whether or not the circulation flow rate is equal to or higher than the specified flow rate. For example, it is determined whether or not the circulation flow rate is equal to or higher than the specified flow rate 1 L / min. If the determination is Yes, the process returns to S1, and if the determination is No, the process proceeds to S10.

  Next, in S10, it is determined whether the number N of retry operations is less than 3. If the determination is Yes, the process proceeds to S11, and if the determination is No, the process proceeds to S13. The number of retry operations is not limited to three and can be changed as appropriate.

  Next, in S11, the bath heating on-off valve 15 is in the open state, the circulation pump 2 is kept in the OFF state for, for example, 5 seconds, and the process proceeds to S12. In S12, the circulation pump 2 is turned on again, the process returns to S5, and the above steps are repeated.

  If the determination of S2 is Yes, that is, if the circulation pump 2 or the circulation flow rate sensor 3 is suspected to be abnormal, and if the determination of S10 is No, that is, the circulation flow rate is less than the specified flow rate even after the retry operation, the clogging of the circulation circuit 7 is suspected. In this case, in S13, the circulation pump 2 is turned off, the bath heating on-off valve 15 is closed to stop the circulation of the circulation circuit 7, and the process proceeds to S14.

  Next, in S14, the fact that an error has occurred in the circulation circuit 7 and the circulation has been stopped is notified to the user by means of a display on the operation remote controller, voice, etc., and the circulation circuit monitoring control is terminated. The hot water heating operation is the same except that the hot water heating on-off valve 18 of the parallel circuit section 16 is operated instead of the bath heating on-off valve 15.

  The circulation circuit monitoring control of the hot water apparatus 1, which is a partial modification of the first embodiment, will be described with reference to FIG. In the configuration of the hot water device 1 and the configuration of the circulation circuit monitoring control, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

  During the bath heating operation described above, if the determination is No in S3, that is, if the circulation flow rate is less than the specified flow rate, the process proceeds to S21. For example, when the circulation flow rate is less than the specified flow rate 1 L / min, the process proceeds to S21.

  Next, in S21, the hot water heating on-off valve 18 corresponding to the other on-off valve that is not opened during the bath heating operation is opened, and the process proceeds to S22. When the hot water heating on-off valve 18 is opened, hot water flows into the parallel passage portion 16.

  Next, in S22, it is determined whether the circulation flow rate is equal to or higher than the specified flow rate. For example, it is determined whether or not the circulation flow rate is equal to or higher than the specified flow rate 1 L / min. If the determination is Yes, and if hot and cold water normally flows through the parallel passage portion 16, there is a possibility that the parallel passage portion 13 is clogged, so the process proceeds to S23. If the determination is No, that is, if the hot water does not flow normally in the parallel passage 16 as well, it is determined that there is an abnormality in the parallel passage 13 and other portions of the circulation circuit 7 other than the parallel passage 16, and the process proceeds to S13. Then, the operation is stopped, the error of the circulation circuit 7 is notified, and the circulation circuit monitoring control is ended.

  Next, in S23, the hot water heating on-off valve 18 is closed and the process proceeds to S4. The subsequent circulation circuit monitoring control is the same as that in the first embodiment.

Next, the operation and effect of the present invention will be described.
When scales accumulated in the auxiliary heat source unit 4 or the hot water storage tank 41 flow out into the circulation circuit 7, the pilot port 35 of the pilot type electromagnetic opening / closing valve has a smaller diameter than the primary passage 31 and the secondary passage 32. Therefore, the scale or the like may block the pilot port 35. Further, the scale or the like attached to the pilot port 35 may be pressed by the pilot valve 36 when closing the pilot-type electromagnetic on- off valve, and the pilot valve 36 and the pilot port 35 may stick to each other.

As for the clogging of the pilot type solenoid on- off valve due to such foreign matter being caught or stuck in the pilot port 35, the pilot valve 36 is driven a plurality of times by performing the above-mentioned retry operation, and the blockage of the pilot port 35 is eliminated. , The pilot type solenoid on- off valve can be returned to a state where it can be normally opened and closed, and the circulation flow rate can be returned to the normal range to continue the bath heating operation and the heating operation.

In addition, the pilot type solenoid on- off valve is closed and opened while operating the circulation pump 2, and the circulation pump 2 is stopped and activated with the pilot type solenoid on- off valve opened, and the water flow and pressure are reduced during the retry operation. Since it is changed, the effect of clearing the clogging of the pilot port 35 can be enhanced.

If multiple parallel passages equipped with pilot-operated solenoid on- off valves are provided, it is possible to identify the parallel passages in which an abnormality has occurred and perform the retry operation, returning to the normal state. If not, the error can be reported by narrowing down the location of the abnormality.

  In addition, those skilled in the art can implement various modifications to the above-described embodiments without departing from the spirit of the present invention, and the present invention includes such modifications.

1 Hot water device 2 Circulation pump 3 Circulation flow rate sensor (flow rate detection means)
4 Auxiliary heat source device 5 Heat exchanger section 7 Circulation circuit 8 Three-way valve 9 Control unit (control means)
10, 11 Temperature sensor 13, 16 Parallel passage part (parallel passage)
14 bath add焚用heat exchanger 15 bath additionally焚用off valve (pilot solenoid on-off valve)
17 Heat exchanger for hot water heating 18 Open / close valve for hot water heating (pilot type electromagnetic open / close valve)
20 Bath Reheating Circuit 23 Hot Water Heating Circuit 35 Pilot Port 36 Pilot Valve 37 Plunger 39 Electromagnetic Coil 41 Hot Water Storage Tank 42 External Heat Source Machine 44 Hot Water Storage Circulation Circuit 47 Water Supply Passage 52 Hot Water Supply Passage 53 Bypass Passage 54 Tank Hot Water Passage 55 Tank Passage 56 Auxiliary Heat source machine hot water passage

Claims (3)

A circulation pump, and a parallel passage to the heat exchanger and the pilot-type electromagnetic valve each pair having a circulation circuit connected by a pipe, the circulation circuit temperature Ru provided with a flow detection means for detecting the flow rate through the In water equipment,
If the circulation flow rate detected by the flow rate detection means when the pilot type solenoid on-off valve provided in one of the parallel passages is opened and the circulation pump is driven is equal to or less than the specified flow rate, the other parallel passage When the circulation flow rate is equal to or higher than the specified flow rate, the plunger of the pilot type solenoid on-off valve provided in the one parallel passage is repeatedly moved forward and backward. The hot water apparatus according to claim 1, further comprising: driving an electromagnetic coil . The hot water apparatus according to claim 1 , wherein the hot water apparatus is provided with a hot water storage tank, and the hot water stored in the hot water storage tank is circulated . When driving the electromagnetic coil so that the plunger of the pilot type solenoid on-off valve repeatedly advances and retracts, the circulation pump is repeatedly driven and stopped so that the pilot type solenoid on-off valve opens and closes while the circulation pump is being driven. The hot water apparatus according to 1 or 2, which is controlled .