JP5956830B2 - Water heater - Google Patents

Description

  Embodiments of the present invention relate to a hot water supply apparatus that supplies hot water in a hot water storage tank to a bathtub.

  2. Description of the Related Art There is known a hot water supply device that includes a hot water storage tank unit that houses a hot water storage tank and a heat pump unit that heats the hot water in the hot water storage tank, and supplies hot water stored in the hot water storage tank from a hot water storage tank unit to a bathtub in a building. .

  This hot water supply device has not only hot water supply that supplies hot water in a hot water storage tank to a bathtub, but also a function of heat insulation and cooking that circulates hot water in the bathtub through a heat exchanger for heating.

JP 2011-43258 A

  When the circulating operation such as heat insulation or additional cooking is performed, the hot water in the bathtub gradually accumulates inside the piping, heat exchanger, pump, etc., and the accumulation of the soil becomes a resistance, resulting in poor hot water circulation. Sometimes.

  An object of an embodiment of the present invention is to provide a hot water supply device that can eliminate poor circulation of hot water.

A hot water supply apparatus according to an embodiment of the present invention supplies hot water to a bathtub, and includes a pipe, a pump provided in the pipe, a detection unit, and a control unit. The piping circulates hot water in the bathtub through a heat exchanger for heating. The pump is for hot water circulation. A detection means detects whether the flow volume of the hot water in piping is more than fixed. If a certain amount of time has passed without the detection means detecting a flow rate in spite of the operation of the pump, the control means will stop the pump once and turn it on / off several times before the pump is stopped. It operated at higher speed.

The figure which shows the structure of one Embodiment. The figure which shows the remote control of one Embodiment. The figure which shows the abnormality alerting | reporting by the remote control of one Embodiment. The flowchart of the control performed with the controller of one Embodiment. The time chart which shows an example of operation | movement of the bath pump and flow switch of one Embodiment. The time chart which shows the other example of operation | movement of the bath pump and flow switch of one Embodiment. The time chart which shows another example of operation | movement of the bath pump and flow switch of one Embodiment. The time chart which shows another example of operation | movement of the bath pump and flow switch of one Embodiment. The flowchart which shows a part of modification of the control performed with a controller.

Hereinafter, an embodiment will be described with reference to the drawings.
In FIG. 1, 1 is a hot water supply unit (also called a hot water storage tank unit) installed outdoors, and water is supplied from an external water supply pipe A1. This water is led to the bottom inlet of the hot water storage tank 5 by the pipe 2 and through the pressure reducing valve 3 and the check valve 4 on the pipe 2. A part of the water flowing between the pressure reducing valve 3 and the check valve 4 in the pipe 2 is led to the first inlet of the mixing valve 7 through the check valve 6, and the hot water flowing out from the mixing valve 7 is piped. 8 is supplied to an external hot water supply pipe A2. A flow rate sensor 9 is attached to the pipe 8. The hot water supply pipe A2 is extended to a kitchen, a washroom, a bathroom shower, and the like. A second inlet of the mixing valve 7 is connected to an upper outlet of the hot water storage tank 5 through a pipe 10.

  A check valve 11 is disposed in the middle of the pipe 10, and hot water upstream of the check valve 11 in the pipe 10 is guided to the first inlet of the mixing valve 12. Water between the pressure reducing valve 3 and the check valve 4 in the pipe 2 is guided to the second inlet of the mixing valve 12. Then, the hot and cold water mixed by the mixing valve 12 is supplied to the outdoor pipe A3 through the pipe 14 and through the hopper 15, the silver ion generator 20 and the flow switch 21 on the pipe 14. The pipe A3 is introduced into the building and connected to the circulation fitting 62 of the bathtub 61 of the bathroom 60. The hopper 15 includes an on-off valve 16, a check valve 17, a flow sensor 18, and a check valve 19. In the pipe 14, the water level of the hot water in the bathtub 61 is detected through the water temperature sensor 22 (temperature detection means) 22 for detecting the temperature Tr of the internal hot water and the pipes 14 and A 3 in the vicinity of the position where the flow switch 21 is disposed. A water level sensor 23 is attached. The flow switch 21 functions as a detecting means for detecting whether or not the flow rate of hot water passing through the pipes A3 and A14 is greater than or equal to a certain value. The flow switch 21 is turned on when it is greater than a certain value and turned off when it is less than a certain value.

  A part of the hot water that has passed through the silver ion generator 20 of the pipe 14 is supplied to the first flow path of the heat exchanger 26 for heating through the bath pump 24 and the pipe 25, The passed hot water is supplied to the outdoor pipe A4 through the pipe 27. This pipe A4 is also introduced into the building and connected to the circulation fitting 62 of the bathtub 61. A hot water temperature sensor 28 for detecting the temperature Ti of the hot water flowing toward the pipe A4 is attached to the pipe 27.

  Hot water on the upstream side of the check valve 11 in the pipe 10 is led to the second flow path of the heat exchanger 26 by the pipe 30 and via the check valve 31 on the pipe 30, The passed hot water is supplied to the upper inlet of the hot water storage tank 5 through the pipe 32, the additional cooking pump 33, and the pipe 44.

  Hot water flowing out from the bottom outlet of the hot water storage tank 5 is supplied to the external pipe A5 by the pipe 40 and the circulation pump 41. This pipe A5 is connected to a water inlet of a heat pump unit 70 that is a heating means. The upstream position of the circulation pump 41 in the pipe 40 is connected to the first outlet of the three-way valve 42, and the inlet of the three-way valve 42 is connected to the external pipe A 6 by the pipe 43. The pipe A6 is connected to the outlet of the heat pump unit 70. The three-way valve 42 causes hot water flowing in from the pipe 43 to flow out from one or both of the first outlet and the second outlet. Hot water flowing out from the second outlet is led to the upper inlet of the hot water storage tank 5 through the pipe 44. An incoming water temperature sensor 45 is attached to the pipe 43, and a boiling temperature sensor 46 is attached to the pipe 44. The incoming water temperature sensor 45 detects the temperature Tt1 of hot water flowing into the hot water supply unit 1 from the pipe A6. The boiling temperature sensor 46 detects the temperature Tt2 of hot water flowing from the pipe 44 to the upper inlet of the hot water storage tank 5.

  The temperature and water level of the hot water in the hot water storage tank 5 are detected by a plurality of temperature sensors T1, T2,... T6 arranged in order from the lower part to the upper part of the hot water storage tank 5.

  The heat pump unit 70 includes a compressor 71, a refrigerant-side flow path of the water-refrigerant heat exchanger 72, a first flow path of the internal heat exchanger 73, a decompressor such as an expansion valve 74, an air heat exchanger 75, and internal heat. It has a heat pump refrigeration cycle in which the second flow path of the exchanger 73 is sequentially connected to circulate the refrigerant, a fan 76 that sends outside air to the air heat exchanger 75, and hot water flowing from the pipe A5 is converted into water-refrigerant heat. A pipe 77 leading to the water-side flow path of the exchanger 72, a pipe 78 leading hot water flowing out from the water-side flow path of the water-refrigerant heat exchanger 72 to the pipe A6, and a water supply for detecting the temperature Twi of the hot water in the pipe 77 A temperature sensor 81 and a boiling temperature sensor 82 for detecting the temperature Two of hot water in the pipe 78 are provided, and hot water supplied from the hot water supply unit 1 is heated by heat drawn from outside air, and hot water obtained by the heating is heated. Hot water supply Supplies to knit 1.

  In addition, a controller 50 is provided in the hot water supply unit 1, and the controller 50 includes a valve / pump / temperature sensor in the hot water supply unit 1, an outside air temperature sensor 83, and a remote control type operating device for the bathroom 60 (operation means; abbreviated as remote control). 63 and the heat pump unit 70 are connected.

  As shown in FIG. 2, the remote control 63 has a liquid crystal display unit 64, an audio input / output unit 65, and an operation door 66 on the front surface. The operation door 66 includes a “Talking” button 66a for setting a conversation mode, an “Attaching” button 66b for setting a warming / cooking operation, and an “Bath” button 66c for setting a hot water supply operation. A plurality of button switches that are linked to the pressing operations of the buttons 66a, 66b, and 66c are arranged on the panel surface that is exposed by opening the operation door 66. In addition, a menu button switch, a hot water temperature setting button switch, a priority / A determination button switch, a washing button switch for designating washing operation, a hot water button switch, a bath water amount setting tongue switch, a bath temperature setting tongue switch, and the like are arranged. The liquid crystal display unit 64 can display pattern information and character information such as the amount of stored hot water, hot water supply temperature, time, and amount of hot water used, and can display the word “clogged” as shown in FIG.

The controller 50 controls the entire water supply apparatus, and has the following control means (1) to (7) as main functions.
(1) First control means for controlling the execution of a hot water storage operation in which hot water in the hot water storage tank 5 is heated by the heat pump unit 70 and hot water obtained by this heating is stored in the hot water storage tank 5.

  (2) Second control means for controlling execution of a hot water supply operation (also referred to as hot water operation) for supplying hot water in the hot water storage tank 5 to the bathtub 61 through the pipes A3 and A4.

  (3) Third control means for controlling execution of the circulating operation for warming and cooking, in which hot water in the bathtub 61 is circulated through the pipes A3 and A4 and the heat exchanger 26 by the operation of the bath pump 24.

  (4) When the washing button switch of the remote controller 63 is pressed, the hot water in the hot water storage tank 5 flows into the bathtub 61 through the pipes 10 and 14 and the pipe A3 and passes through the silver ion generator 20 in the pipe 14. Is formed for a certain period of time, and the silver ion generator 20 is operated at the time of formation of a cleaning flow path that flows to the bathtub 61 through the bath pump 24, the pipe 25, the heat exchanger 26, the pipe 27, and the pipe A4. Fourth control means for controlling execution of the cleaning operation.

  (5) During the above-described circulation operation, when the predetermined time t1s (for example, 40 to 60 seconds) elapses without the flow switch 21 being turned on despite the operation of the bath pump 24, the rotation speed N of the bath pump 24 is increased. Control means. The motor of the bath pump 24 is connected to an inverter that outputs driving power. By changing the output frequency of the inverter, the rotation speed of the bath pump 24 changes.

  (6) When the predetermined time t3s (for example, 40 to 60 seconds) elapses without the flow switch 21 being turned on even though the rotational speed N of the bath pump 24 is increased, the operation of the bath pump 24 is stopped and the remote control 63 And a sixth control means for notifying the abnormality and prohibiting the circulation operation by the bath pump 24 thereafter.

  (7) Seventh control means for releasing the abnormality notification and the circulation operation prohibition by the sixth control means in response to the subsequent execution of the cleaning operation or the abnormality reset operation.

Next, the operation will be described.
For example, in the late-night power hours, the compressor 71 in the heat pump unit 70 is turned on, and the refrigerant discharged from the compressor 71 is the refrigerant-side flow path of the water-refrigerant heat exchanger 72, the first of the internal heat exchanger 73. The air is sucked into the compressor 71 through the flow path, the expansion valve 74, the air heat exchanger 75, and the second flow path of the internal heat exchanger 73. Accordingly, the circulation pump 41 of the hot water supply unit 1 is turned on and the first outlet and the inlet of the three-way valve 42 are communicated, and the hot water at the lower part of the hot water storage tank 5 is connected to the pipe 40, the circulation pump 41, the pipe A5, Hot water heated by the water-refrigerant heat exchanger 72 flows through the pipe 78, the pipe A6, the pipe 43, and the three-way valve 42 through the pipe 77 to the water-side flow path of the water-refrigerant heat exchanger 72. Return to 40.

  When the temperature Two of the hot water passing through the pipe 78 is detected by the boiling temperature sensor 82 and the detected temperature reaches a predetermined hot water storage temperature, the three-way valve 42 is switched and the inlet and the second outlet are changed. Communicate. As the three-way valve 42 is switched, hot water heated by the water-refrigerant heat exchanger 72 flows through the pipe 78, the pipe A 6, the pipe 43, the three-way valve 42, and the pipe 44 to the upper part of the hot water storage tank 5. As a result, hot water is stored in the hot water storage tank 5.

When the “bath” button 66c of the remote controller 63 is pressed, the on-off valve 16 of the hopper 15 is opened and the silver ion generator 20 is turned on. Thereby, hot water in the hot water storage tank 5 is supplied to the bathtub 61 through the pipe 10, the mixing valve 12, the pipe 14, the hopper 15, the silver ion generator 20, the flow switch 21, and the pipe A3, and the silver ion generator. Part of the hot water having passed through 20 is also supplied to the bathtub 61 through a path passing through the bath pump 24, the pipe 25, the heat exchanger 26, the pipe 27, and the pipe A4. At this time, the silver ion generator 20 generates silver ions, and the silver ions are given to the hot water in the pipe 14. Further, when the amount of hot water supplied to the bathtub 61 is detected by the flow rate sensor 18 in the hopper 15 and the detected amount reaches the set amount of hot water of the remote controller 63, the on-off valve 16 of the hopper 15 is closed and silver ions are generated. The vessel 20 is turned off and the hot water operation is terminated.
After completion of the hot water operation, the bath pump 24 is turned on at a regular or irregular timing, and the hot water in the bathtub 61 flows into the pipe A3, the pipe 14, the bath pump 24, as shown by the broken line arrows in FIG. It circulates through the piping 25, the 1st flow path of the heat exchanger 26, the piping 27, and piping A4. At this time, the temperature of hot water passing through the pipe 14 is detected by the hot water temperature sensor 22, and if the detected temperature does not reach the set hot water temperature of the remote controller 63, the additional cooking pump 33 is turned on. When the additional cooking pump 33 is turned on, the hot water in the hot water storage tank 5 is circulated through the piping 10, the piping 30, the second flow path of the heat exchanger 26, the piping 32, the additional cooking pump 33, and the piping 44 to exchange heat. The hot water in the bathtub circulating through the first flow path of the heat exchanger 26 is heated by the heat of the hot water passing through the second flow path of the vessel 26. The hot water thus heated returns to the bathtub 61, and the hot water in the bathtub 61 is kept warm. When the detected temperature of the hot water temperature sensor 22 reaches the set hot water temperature, the bath pump 24 and the additional cooking pump 33 are turned off, and the circulation operation for heat insulation is completed.

  Even when the hot button 66b of the remote control 63 is pressed, hot water in the bathtub 61 is additionally cooked by the same circulation operation.

In such a heat-retaining or additional cooking circulation operation or a circulation trial operation by an operator immediately after the hot water supply apparatus is installed, the control shown in the flowchart of FIG.
That is, at the start of the circulating operation (YES in step 100), on condition that the later-described circulating operation prohibition mode is not set (YES in step 101), and that the rotational speed flag f is “0”. In step 102 (YES in step 102), the bath pump 24 is turned on at a normal rotational speed N1, for example, 4000 rpm (step 103). With this operation on, a time count t1 is executed (step 105), and the time count t1 is compared with a fixed time t1s (40 to 60 seconds) (step 106). When the time count t1 is less than the predetermined time t1s (NO in step 106), it is monitored whether the flow switch 21 is turned on (step 107). When the flow switch 21 is OFF (NO in step 107), the process returns to step 105, and the time count t1 is repeated.

  If the flow switch 21 is turned on before the time count t1 reaches the predetermined time t1s (NO in step 106, YES in step 107), the circulation operation end condition is met, for example, the temperature detected by the hot water temperature sensor 22 reaches the set hot water temperature. It is monitored for satisfaction (step 108). If the condition for terminating the circulation operation is not satisfied (NO in step 108), the process returns to step 107 and the monitoring of the flow switch 21 is repeated. Thereafter, when the condition for terminating the circulation operation is satisfied (YES in Step 108), the bath pump 24 is turned off (Step 109). The circulation operation ends when this operation is turned off. Then, the time counts t1 and t2 are reset (step 125).

  However, as shown in FIG. 5, when the time count t1 reaches a certain time t1s without the flow switch 21 being turned on (YES in step 106), that is, the piping A3, regardless of the operation of the bath pump 24 being turned on. If the flow rate of hot water in 14 does not exceed a certain level, the bath pump 24 is turned off under the judgment that the circulation of hot water is poor (step 110). Accordingly, a time count t2 is executed (step 111), and the time count t2 is compared with a fixed time t2s (10 seconds) (step 112). When the time count t2 reaches the predetermined time t2s (YES in step 112), the bath pump 24 is turned on at a rotational speed N2 higher than the normal rotational speed N1, for example, 4500 rpm (step 113). At this time, the rotation speed flag f is set to “1” (step 114).

  When the tightening of the pipes A3, A4, etc. is poor, the air enters the pipes A3, A4, and the mixed air becomes fine particles and accumulates in the bottom pump 24. If the amount of accumulated air particles increases, the water supply efficiency of the bath pump 24 is lowered, resulting in poor circulation of hot water. In order to prevent such a problem, the operation of the bath pump 24 is once turned off and then turned on as described above. Once the bath pump 24 is turned off, the fine air particles staying in the bath pump 24 gather at the upper part of the bath pump 24 and harden, and the lump is immediately outside the bath pump 24 when the next bath pump 24 is turned on. Discharged. By this discharge, the poor circulation of hot water can be solved.

  With the operation of the bath pump 24 due to the increase in the rotational speed, a time count t3 is executed (step 115), and the time count t3 is compared with a fixed time t3s (40 to 60 seconds) (step 116). When the time count t1 is less than the predetermined time t3s (NO in step 116), it is monitored whether the flow switch 21 is turned on (step 117). If the flow switch 21 is OFF (NO in step 117), the process returns to step 115 and the time count t3 is repeated.

  If the flow switch 21 is turned on before the time count t3 reaches the predetermined time t3s (YES in step 117), the circulation operation end condition is satisfied, for example, the temperature detected by the hot water temperature sensor 22 reaches the set hot water temperature. It is monitored for presence (step 118). If the end condition of the circulation operation is not satisfied (NO in step 108), the process returns to step 117, and the monitoring of the flow switch 21 is repeated. Thereafter, when the end condition of the circulation operation is satisfied (YES in Step 118), the bath pump 24 is turned off (Step 119). The circulation operation ends when this operation is turned off. Then, the time counts t1, t2, and t3 are reset (step 125).

  However, as shown in FIG. 6, when the time count t3 reaches a certain time t3s without the flow switch 21 being turned on (YES in step 116), that is, although the operation is turned on due to an increase in the rotational speed of the bath pump 24. If the flow rate of hot water in the pipes A3 and 14 does not exceed a certain level, the bath pump 24 is turned off under the judgment that the circulation of hot water is poor (step 120).

  When the water pump 24 is turned off, if the detected water level of the water level sensor 23 (the level of the hot water in the bathtub 61) is above a certain level (YES in step 121), dirt is clogged in the pipes A3 and 14 and the hot water is poured. As shown in FIG. 3, a clogging abnormality notification that displays the word “clogging” is performed on the liquid crystal display unit 64 of the remote controller 63, as shown in FIG. 3 (step 122). Then, a circulation operation prohibiting mode for prohibiting the subsequent circulation operation is set (step 124), and the time counts t1, t2, and t3 are reset (step 125).

  The user who sees this clogging abnormality notices that the piping is clogged with dirt, and designates the cleaning operation with the remote control 63 to clean the piping A3, 14, or ask the dealer or manufacturer for inspection and maintenance. Request service. If a clogging error is displayed during a cycle test run by a worker immediately after installing the hot water supply device, the worker has not clogged the installed pipe or has not installed a pipe smaller than the rated value by mistake. Check the details of the work, such as whether the pipe longer than the rating was accidentally installed, and take measures such as replacing the pipe if necessary.

  If the water level detected by the water level sensor 23 is less than a certain level when the bath pump 24 is turned off (NO in step 121), it is assumed that there is an abnormal operation in which the bath pump 24 runs idle with no hot water in the bathtub 61. An empty driving clogging abnormality notification for displaying the word “empty driving” is performed on the liquid crystal display unit 64 of the remote controller 63 (step 123). Then, a circulation operation inhibition mode for inhibiting the subsequent circulation operation is set (step 124), and the time counts t1, t2, and t3 are reset (step 125).

  The user who sees the indication of the abnormal operation of the idle air senses that the pump is idling, checks the hot water and the stopper of the bathtub 61, and requests the inspection and maintenance service from the store or manufacturer. If an abnormal operation indication is displayed during a cycle test run by a worker immediately after installing the hot water supply device, the worker confirms the hot water and the plug in the bathtub 61, and confirms the leakage of the installed piping. Take appropriate measures.

  After the clogging abnormality or the idling operation abnormality occurs and the bath pump 24 is turned off, even if the remote control 63 designates the start of the circulation operation again (YES in Step 100), the circulation operation prohibition mode is set ( NO in step 101) If the user-designated cleaning operation has not been executed (NO in step 126), or if an abnormality reset operation by an operator or user has not been performed by the remote control 63 (NO in step 127), for example. The bath pump 24 is not turned on and is safe.

  When a cleaning operation specified by the user is executed after a clogging abnormality or an empty operation abnormality (YES in step 126), or the worker resets the abnormality by the worker or the user by redoing the piping. (YES in step 127), the abnormality notification and the circulation operation prohibition mode are canceled (step 128), and the rotation speed flag f is reset to “0” (step 129).

  If the circulation operation prohibition mode is canceled at the start of the next circulation operation (YES in step 100, YES in step 101), and if the rotation speed flag f is reset to “0” (YES in step 102). The bath pump 24 is turned on at the normal rotation speed N1 (step 103).

  On the other hand, when the bath pump 24 is turned on at the rotation speed N2 and the end condition of the circulation operation is satisfied without causing any abnormality, and the bath pump 24 is turned off, the next cycle operation is started (step 100). Since the circulation operation prohibition mode is not set (YES in step 101), and the rotation speed flag f is “1” (NO in step 102), as shown in FIG. 24 is turned on at the rotational speed N2 from the beginning (step 104). Thus, when the bath pump 24 is turned on at the rotation speed N2 higher than the normal rotation speed N1, the circulation operation can be continued if the dirt in the pipes A3 and A14 is not so severe.

  However, if the dirt in the pipes A3 and 14 is severe, or if the pipes A3 and 14 are clogged, or if the installed pipe A3 is thinner than the rating, or if the installed pipe A3 is longer than the rating, or the bathtub 61 Even when the bath pump 24 is turned on at a rotational speed N2 higher than the normal rotational speed N1, such as when there is no hot water in the interior, as shown in FIG. 7, the time count t1 is kept at a constant time t1s without the flow switch 21 being turned on. May be reached (YES in step 106). In this case, the bath pump 24 is turned off for a predetermined time t2s based on the time count t2 (YES in Step 110, Step 111, and Step 112), and then the bath pump 24 is turned on again at the rotational speed N2 ( Step 113). Accordingly, the rotation speed flag f is set to “1” (step 114), and the time count t3 is started (step 115). Then, as shown in FIG. 8, when the time count t3 reaches a certain time t3s without turning on the flow switch 21 (YES in Step 116), under the judgment that the circulation of hot water is poor, The bath pump 24 is turned off (step 120), and the same abnormality notification and operation prohibition mode are set (steps 121 to 124).

  As described above, in the case where hot water with a flow rate higher than a certain level does not flow despite the operation of the bath pump 24, the circulation failure of hot water can be solved by increasing the rotation speed N of the bath pump 24. If the circulation failure cannot be resolved even if the rotational speed N is increased, the abnormality is notified, so that the problem that the circulation failure continues forever can be solved.

  Since the operation of the bath pump 24 is temporarily turned off before the rotation speed N of the bath pump 24 is increased, the poor circulation due to fine air particles can be eliminated.

[Modification]
In the above-described embodiment, the operation of the bath pump 24 is turned off once before the rotation speed N of the bath pump 24 is increased. However, the operation of the bath pump 24 is turned on a plurality of times before the rotation speed N of the bath pump 24 is increased. You may turn it off.
In this case, as shown in FIG. 9, steps 201 to 211 are executed before steps 110, 111, and 112.

  That is, when the time count t1 reaches the predetermined time t1s without turning on the flow switch 21 (YES in step 106), the bath pump 24 is turned off (step 201). At this time, the count K is incremented by “1” (step 202). Then, the time count tx is executed (step 203), and the time count tx is compared with the fixed time txs (10 seconds) (step 204). When the time count tx reaches a certain time txs (YES in step 204), the time count tx is reset (step 205), and the bath pump 24 is turned on (step 206). The rotational speed N of the bath pump 24 at this time may be either N1 or N2 depending on the previous control situation.

  A time count ty is executed as the bath pump 24 is turned on (step 207), and the time count ty is compared with a predetermined time tys (for example, 10 seconds) (step 208). When the time count ty reaches a certain time tys (YES in step 208), the time count ty is reset (step 209), and it is determined whether the number count K has reached a set value Ks, for example, “3” (step 209). Step 201). If the count K does not reach the set value Ks (NO in step 210), the processing from step 201 is repeated. When the count K reaches the set value Ks (YES in step 210), the count pump K is reset (step 211), and then the bath pump 24 is turned off (step 110). Subsequent processing is the same as in the above embodiment, and a description thereof will be omitted.

  In this way, by turning on and off the operation of the bath pump 24 a plurality of times before increasing the rotational speed N of the bath pump 24, even if there are a lot of fine air particles, for example, the poor circulation due to that can be reliably eliminated. .

  The cleaning operation is not limited to the flow path by the fourth control means, but may be the same circulation flow path as that in the additional cooking operation.

  In addition, the said embodiment and modification are shown as an example and are not intending limiting the range of invention. Each of the novel embodiments and modifications can be implemented in various other forms, and various omissions, rewrites, and changes can be made without departing from the spirit of the invention. In these embodiments and modifications, the scope of the invention is included in the gist, and is included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Hot water supply unit, 5 ... Hot water storage tank, 12 ... Mixing valve, 14 ... Piping, 15 ... Hopper, 16 ... Open / close valve, 18 ... Flow sensor, 20 ... Silver ion generator, 21 ... Flow switch (detection means) 23 ... Water level sensor, A3 ... pipe, 24 ... bath pump, 25 ... pipe, 26 ... heat exchanger, 27 ... pipe, A4 ... pipe, 50 ... controller, 51 ... CPU, 52 ... switch, 53 ... drive circuit, 60 ... bathroom 61 ... tub, 63 ... remote control

Claims (3)

In a hot water supply device for supplying hot water to a bathtub,
Piping for circulating hot water in the bathtub through a heat exchanger for heating;
A pump for circulating hot water provided in the pipe;
Detecting means for detecting whether the flow rate of the hot water in the pipe is above a certain level;
When a certain amount of time has passed without detecting the flow rate above a certain level in spite of the operation of the pump, the pump is temporarily stopped and turned on and off several times before the pump is stopped from before the stop. Control means operating at a high rotational speed;
A hot water supply apparatus comprising: When the control means does not detect a flow rate above a certain level despite increasing the number of rotations of the pump, the control means stops the pump and reports an abnormality.
The hot water supply apparatus according to claim 1 . The control means stops the pump to notify the abnormality and prohibits the operation of the pump when the detection means does not detect a flow rate higher than a certain level even though the rotation speed of the pump is increased. In addition, the abnormality notification and the prohibition of operation are canceled according to the subsequent execution of the cleaning operation on the piping or the reset operation of the abnormality.
The hot water supply apparatus according to claim 1 .

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