JP2009281665A - Storage water heater and storage water heater heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage water heater not causing defective circulation of a circulation circuit by minimizing malfunction caused in a circulating pump due to cavitation even if cavitation is generated in the circulating pump. <P>SOLUTION: In the storage water heater equipped with the circulation circuit 9 connecting a hot water storage tank 2 and a heating means 3 such that circulation is possible, the circulating pump 30 provided in the circulation circuit 9, a water supply pipe 30 supplying water to the hot water storage tank 2, and a control part 35 controlling operation of the heating means 3, setting a target rotational frequency of the circulating pump 30, and controlling the circulating pump 30 such that it is operated at the target rotational frequency, a cavitation detection means 36 is provided for detecting that cavitation of the circulating pump 30 has occurred during operation of the circulating pump 30, and in the control part 35, when a detection signal from the cavitation detection means 36 is received, the circulating pump 30 is stopped, and the target rotational frequency is corrected to a lower rotational frequency to operate the circulating pump 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage type hot water supply device that uses hot water in a hot water storage tank for hot water supply and the like, and a hot water storage type hot water supply and heating device that uses hot water in a hot water storage tank as a heat source.

  Conventionally, this type has been shown in FIG. 101 is a hot water storage tank for storing hot water, 102 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank 101, 103 is a circulation circuit for connecting the hot water storage tank 101 and the heat pump unit 102 in a circulating manner, and 104 is a circulation circuit. The circulation pump provided in 103, 105 is a water supply pipe connected to the lower part of the hot water storage tank 101, 106 is a hot water supply pipe connected to the upper part of the hot water storage tank 101, and when boiling hot water in the hot water storage tank 101, The heating means 102 and the circulation pump 104 are operated to boil hot water in the hot water storage tank 101 to store hot water in the hot water storage tank 101, and this high temperature water is used for hot water supply, heating, and the like.

Reference numeral 107 denotes a primary side circulation circuit that returns to the hot water storage tank 101 from the upper part of the hot water storage tank 101 via the heating heat exchanger 108, 109 denotes a primary side circulation pump provided in the primary side circulation circuit 107, and 110 denotes the heating. The secondary side circulation circuit 112 that connects the heat exchanger 108 for heating and the heating terminal 111 that heats the room in a circulating manner, 112 is a secondary side circulation pump provided in the secondary side circulation circuit 110, and during the heating operation, The primary circulation pump 109 and the secondary circulation pump 112 are operated to exchange heat between the high-temperature water in the hot water storage tank 101 and the heating medium on the heating terminal 111 side by the heating heat exchanger 108 and to heat the room by the heating terminal 111. There was something to do. (For example, refer to Patent Document 1.)
JP 2007-85663 A

  By the way, in this conventional one, the hot water in the hot water storage tank 101 is boiled in a state where the supply water pressure supplied from the water supply pipe 105 to the hot water storage tank 101 is lowered or cut off due to water shutoff or opening of the antifreeze water faucet. If the circulation pump 104 is operated by such means, cavitation may occur in the circulation pump 104. If cavitation occurs in the circulation pump 104, a malfunction in the circulation circuit 103 is caused only by a malfunction of the circulation pump 104. However, there is a big problem that the circulation pump 104 generates a large noise or vibration or causes erosion and shortens the life of the circulation pump 104. Not only can the hot water in the hot water storage tank 101 be boiled, but it is circulated especially at low outside temperatures. Circulation circuit 103 circulation does not act for the antifreeze of the road 103 was achieved, resulting in inconvenience that would freeze.

  In addition, when the primary circulation pump 109 is operated by the heating operation or the like in a state where the supply water pressure supplied from the water supply pipe 105 to the hot water storage tank 101 is reduced or cut off due to water shutoff or opening of the antifreeze faucet, etc. As in the case of the circulation pump 104 described above, cavitation may occur in the primary side circulation pump 109. When cavitation occurs in the primary side circulation pump 109, the primary side circulation circuit is not operated due to malfunction of the primary side circulation pump 109. In addition to causing poor circulation in 107, the primary side circulation pump 109 generates a large noise and vibration, and has a serious problem of causing erosion and shortening the life of the primary side circulation pump 109. Yes, if poor circulation in the primary side circulation circuit 107 is caused, the heating operation cannot be performed at a low outside temperature that requires the heating operation. Not only does this cause the problem that the room is in an unheated state, but also the problem that the circulation for preventing freezing of the primary circuit circuit 107 does not work and the primary circuit circuit 107 freezes. .

  In order to solve the above-mentioned problems, the present invention is particularly configured in claim 1 as follows: a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, the hot water storage tank, and the heating means. A circulation circuit connected in a circulating manner, a circulation pump provided in the circulation circuit, a water supply pipe for supplying water to the hot water storage tank, and controlling the operation of the heating means and setting a target rotational speed of the circulation pump, A hot water storage type hot water supply apparatus comprising a control unit for controlling the circulation pump to operate at a target rotational speed, and provided with cavitation detection means for detecting that cavitation of the circulation pump has occurred during operation of the circulation pump, and the control When receiving the detection signal from the cavitation detection means, the section stops the circulation pump and sets the target rotational speed to a lower speed than before. It was assumed to operate the circulation pump is corrected to a few.

  In claim 2, when the control unit receives a detection signal from the cavitation detection unit, the control unit stops the circulation pump, corrects the target rotation number to the minimum rotation number, and drives the circulation pump. .

  According to a third aspect of the present invention, there is provided a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulating manner, and the circulation circuit. And a controller for controlling the operation of the heating means, setting a target rotational speed of the circulating pump, and controlling the circulating pump to operate at the target rotational speed. And a cavitation detecting means for detecting that cavitation of the circulation pump has occurred during operation of the circulation pump, and the controller operates the heating means and the circulation pump to store hot water. When a detection signal is received from the cavitation detection means during the boiling operation for boiling hot water in the tank, the boiling operation is stopped. Performs notification of errors together, and shall not the boiling operation until said said error is canceled.

  According to a fourth aspect of the present invention, there is provided a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and the circulation circuit. And a controller for controlling the operation of the heating means, setting a target rotational speed of the circulating pump, and controlling the circulating pump to operate at the target rotational speed. In the hot water storage type hot water supply apparatus provided with a pump bypass pipe having a flow rate adjusting valve connected between the discharge side and the suction side of the circulation pump, and when the circulation pump is operated, the cavitation of the circulation pump Cavitation detection means for detecting the occurrence of the circulation pump is provided, and the control unit receives the detection signal from the cavitation detection means. It stops, by adjusting the flow control valve to a predetermined opening degree, was assumed to operate the circulation pump.

  Further, in claim 5, when the control unit receives a detection signal from the cavitation detection unit, the control unit stops the circulation pump, adjusts the flow rate adjustment valve to a maximum opening degree, and operates the circulation pump. .

  According to a sixth aspect of the present invention, in the hot water storage type hot water supply apparatus according to any one of the first to fifth aspects, an actual rotational speed detecting means for detecting an actual rotational speed at the time of operation of the circulation pump is provided, and the cavitation detecting means comprises: Based on the actual rotational speed of the circulating pump detected by the actual rotational speed detection means, it is detected that cavitation of the circulating pump has occurred.

  Further, in claim 7, a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, the hot water in the hot water storage tank and the heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and In a hot water storage hot water supply / heater system comprising a heating control unit that sets a target rotational speed of the primary side circulation pump and controls the primary side circulation pump to operate at the target rotational speed, the primary side circulation pump is operated when the primary side circulation pump is operated. A heating pump cavitation detecting means for detecting the occurrence of cavitation of the circulation pump is provided, and the heating control unit receives a detection signal from the heating pump cavitation detecting means. It said stopping the primary side circulation pump was assumed to operate the primary side circulation pump corrected to the target rotational speed to the rotational speed lower than before.

  Further, in claim 8, a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, hot water in the hot water storage tank and a heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and A secondary-side circulation circuit that connects the heating terminal and the heating heat exchanger in a circulatory manner, a secondary-side circulation pump provided in the secondary-side circulation circuit, and a target rotational speed of the primary-side circulation pump In a hot water storage hot water supply / heater system comprising a heating control unit configured to set and control the primary side circulation pump to operate at a target rotational speed, the fact that cavitation of the primary side circulation pump has occurred during the operation of the primary side circulation pump Warm to detect A pump cavitation detecting means is provided, and the heating control unit operates the primary side circulation pump and the secondary side circulation pump, exchanges heat by the heat exchanger for heating, and performs heating in the room by the heating terminal. Upon receiving a detection signal from the heating pump cavitation detecting means, an error is notified and the primary side circulation pump is stopped, and the target rotation speed is corrected to a lower rotation speed than before, and the primary side circulation pump is It was supposed to be activated.

  According to a ninth aspect of the present invention, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump, corrects the target rotation number to the minimum rotation number and corrects the primary side circulation. The pump was activated.

  In claim 10, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump, and the target rotational speed is a rotational speed that is lower by a predetermined rotational speed than before. When the primary side circulation pump is operated and the detection signal from the heating pump cavitation detection means is received thereafter, the primary side circulation pump is stopped and the target rotational speed is set to a predetermined rotational speed than before. The control for correcting the rotation speed to a low value and operating the primary side circulation pump is repeatedly performed until no detection signal is received from the heating pump cavitation detection means.

  Further, in claim 11, a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, hot water in the hot water storage tank and a heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and A hot water storage type hot water supply / heater apparatus including a heating control unit configured to set a target rotational speed of the primary side circulation pump and control the primary side circulation pump to operate at the target rotational speed, the discharge side and the suction side of the primary side circulation pump And a heating pump bypass pipe having a heating flow rate adjusting valve in the middle thereof, and a heating pump that detects that cavitation of the primary circulation pump has occurred during operation of the primary circulation pump Cavitation detection means is provided, and when the heating control unit receives the detection signal from the heating pump cavitation detection means, the primary side circulation pump is stopped and the heating flow rate adjustment valve is adjusted to a predetermined opening degree to The primary circulation pump was operated.

  Further, in claim 12, a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, hot water in the hot water storage tank and a heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and A secondary-side circulation circuit that connects the heating terminal and the heating heat exchanger in a circulatory manner, a secondary-side circulation pump provided in the secondary-side circulation circuit, and a target rotational speed of the primary-side circulation pump In a hot water storage type hot water supply / heating device having a heating control unit configured to control the primary side circulation pump to operate at a target rotational speed, the discharge side and the suction side of the primary side circulation pump are connected to adjust the heating flow rate in the middle Heating pump bypass with valve And a heating pump cavitation detecting means for detecting the occurrence of cavitation of the primary circulation pump during operation of the primary circulation pump, and the heating control unit includes a primary circulation pump and a secondary circulation pump When a detection signal is received from the heating pump cavitation detection means during a heating operation in which the heating heat exchanger is operated and heat is exchanged by the heating heat exchanger and the room is heated by the heating terminal, an error is notified and the primary side circulation is performed. The pump was stopped, the heating flow rate adjustment valve was adjusted to a predetermined opening, and the primary circulation pump was operated.

  According to a thirteenth aspect of the present invention, when the heating control unit receives a detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump and adjusts the heating flow rate adjustment valve to a maximum opening degree to adjust the primary side. The circulation pump was operated.

  In claim 14, when the heating control unit receives a detection signal from the heating pump cavitation detection means, the heating control unit stops the primary-side circulation pump and adjusts the heating flow rate adjustment valve to a maximum opening degree, thereby the primary control unit. The side circulation pump was operated, and then the opening degree of the heating flow rate adjusting valve was gradually decreased to adjust the opening degree so that cavitation of the primary side circulation pump would not occur.

  Further, in the fifteenth aspect, in the hot water storage type hot water supply and heating device according to any one of the seventh to fourteenth aspects, a heating pump actual rotation number detecting means for detecting an actual rotation number when the primary side circulation pump is operated is provided, and the heating pump The cavitation detection means detects that cavitation of the primary side circulation pump has occurred based on the actual rotation speed of the primary side circulation pump detected by the heating pump actual rotation speed detection means.

  In the sixteenth aspect, a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circuit provided in the circulation circuit are provided. A control unit for controlling the operation of the heating means, setting a target rotational speed of the circulating pump and controlling the circulating pump to operate at the target rotational speed In the hot water storage type hot water supply apparatus provided with the above, a supply water pressure drop detecting means for detecting that the feed water pressure has dropped is provided, and when the control unit receives a detection signal from the feed water pressure drop detecting means, The target rotational speed is set to the minimum rotational speed.

  Further, in claim 17, a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and the circulation circuit are provided. And a controller for controlling the operation of the heating means, setting a target rotational speed of the circulating pump, and controlling the circulating pump to operate at the target rotational speed. In the hot water storage type hot water supply apparatus comprising: a water supply pressure drop detecting means for detecting that the water supply pressure has dropped, and when the control unit receives a detection signal from the water supply pressure drop detecting means, an error notification is provided. In addition, the heating means and the circulation pump are operated to boil the hot water in the hot water storage tank until the error is cleared.

  Further, in claim 18, a hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circuit provided in the circulation circuit. A control unit for controlling the operation of the heating means, setting a target rotational speed of the circulating pump and controlling the circulating pump to operate at the target rotational speed In the hot water storage type hot water supply apparatus equipped with the above, a pump bypass pipe having a flow rate adjusting valve is provided in the middle of connecting the discharge side and the suction side of the circulation pump, and the supply water pressure drop is detected. A detection unit is provided, and the control unit sets the flow rate adjustment valve to a maximum opening when receiving a detection signal from the feed water pressure drop detection unit.

  According to a nineteenth aspect of the present invention, the feed water pressure drop detecting means detects that the feed water pressure has dropped based on a feed water pressure detected by a feed water pressure sensor provided in the feed water pipe.

  Further, in claim 20, a hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, hot water in the hot water storage tank and a heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and In a hot water storage hot water supply / heater system having a heating control unit that sets a target rotation speed of the primary side circulation pump and controls the primary side circulation pump to operate at the target rotation speed, a supply water pressure that detects a decrease in the supply water pressure A decrease detection unit is provided, and the heating control unit sets the target rotation number of the primary side circulation pump to a minimum rotation number when receiving a detection signal from the feed water pressure decrease detection unit.

  The hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, the hot water in the hot water storage tank and the heating medium on the heating terminal side. A heating heat exchanger for exchanging heat, a primary side circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary side circulation pump provided in the primary side circulation circuit, and A hot water storage type hot water heater having a heating control unit that sets a target rotation speed of the primary side circulation pump and controls the primary side circulation pump to operate at the target rotation speed, the discharge side and the suction side of the primary side circulation pump And a heating pump bypass pipe having a heating flow rate adjustment valve in the middle, and a supply water pressure drop detecting means for detecting that the supply water pressure has dropped is provided, and the heating control unit is provided with the supply water pressure drop detecting means from When receiving the match signal, and shall be the maximum opening degree of the heating flow control valve.

  According to a twenty-second aspect of the present invention, the feed water pressure drop detecting means detects that the feed water pressure has dropped based on a feed water pressure detected by a feed water pressure sensor provided in the feed water pipe.

  According to claim 1 of the present invention, cavitation detection means for detecting that cavitation of the circulation pump has occurred during operation of the circulation pump is provided, and the control unit receives a detection signal from the cavitation detection means. Since the circulation pump is stopped, noise, vibration and erosion caused by the circulation pump due to cavitation can be minimized, and the life of the circulation pump can be suppressed from being shortened. By correcting the target rotation speed of the circulation pump to a lower rotation speed than before, the possibility of cavitation occurring even when the circulation pump is operated can be reduced, resulting in poor circulation in the circulation circuit. There is no.

  According to a second aspect of the present invention, when the control unit receives the detection signal from the cavitation detection means, the control unit stops the circulation pump and corrects the target rotation number of the circulation pump to the minimum rotation number. Even if the is operated, cavitation does not occur, and the circulation failure in the circulation circuit is not caused.

  According to a third aspect of the present invention, when the control unit receives a detection signal from the cavitation detection unit during a boiling operation of operating the heating unit and the circulation pump to boil hot water in the hot water storage tank, Since the operation is stopped, noise, vibration and erosion caused by the circulation pump due to cavitation can be minimized, and the life of the circulation pump can be suppressed from being shortened. Since the notification is made, the user can be alerted and the user can grasp the reason why the boiling operation is stopped, and the boiling operation is not performed until the error is cleared. In addition, the recurrence of cavitation due to the circulation pump operation can be prevented in advance, and it is safe and secure even when the next boiling operation is performed. In are those that can be used.

  According to a fourth aspect of the present invention, the control unit stops the circulating pump when receiving the detection signal from the cavitation detecting means, so that the noise, vibration and erosion generated in the circulating pump due to cavitation are minimized. The flow rate adjusting valve provided in the middle of the pump bypass pipe connecting the discharge side and the suction side of the circulation pump can be suppressed. By adjusting the flow rate of hot water flowing through the pump bypass pipe after adjusting to a predetermined opening, that is, the flow rate returning to the suction side of the circulation pump, the pressure applied to the suction side of the circulation pump is compensated and the circulation pump is operated. However, it is possible to reduce the possibility of cavitation, and to prevent poor circulation in the circulation circuit.

  Further, according to claim 5, when the control unit receives the detection signal from the cavitation detection means, the control unit stops the circulation pump and adjusts the flow rate adjustment valve to the maximum opening, thereby sucking the circulation pump. Since the flow rate returning to the side becomes maximum and the pressure applied to the suction side of the circulation pump increases, cavitation does not occur even when the circulation pump is operated, and circulation failure in the circulation circuit is not caused.

  According to claim 6, when the cavitation of the circulating pump occurs, the actual rotational speed of the circulating pump obviously increases. Therefore, the actual rotational speed detecting means for detecting the actual rotational speed when the circulating pump is operated is provided. The cavitation detecting means detects that cavitation of the circulating pump has occurred based on the actual rotational speed of the circulating pump detected by the actual rotational speed detecting means, so that the cavitation of the circulating pump can be reliably performed with simple control. Can be detected.

  According to the seventh aspect of the invention, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the primary side circulation pump is stopped. Vibration and erosion can be minimized, the life of the primary circulation pump can be prevented from shortening, and the target rotational speed of the primary circulation pump can be reduced to a lower level than before. By correcting the number, it is possible to reduce the possibility that cavitation will occur even if the primary side circulation pump is operated, and it is possible to prevent poor circulation in the primary side circulation circuit.

  According to claim 8, the heating control unit stops the primary-side circulation pump upon receiving a detection signal from the heating pump cavitation detection means during heating operation. Therefore, the primary-side circulation pump caused by cavitation Noise, vibration, and erosion generated in the system can be minimized, and the life of the primary circulation pump can be prevented from being shortened. Since the target pump speed is corrected to a lower speed than before and the circulation pump is operated, cavitation occurs even if the primary side circulation pump is operated. The fear can be reduced, the circulation failure in the primary side circulation circuit is not caused, and no heating is prevented.

  According to a ninth aspect of the present invention, when the heating control unit receives the detection signal from the heating pump cavitation detection unit, the heating control unit stops the primary side circulation pump and corrects the target rotational speed to the minimum rotational speed. , Even if the primary side circulation pump is operated, cavitation does not occur, and the circulation failure in the primary side circulation circuit is not caused, so that the minimum indoor heating can be performed, and the room is not heated. There is no.

  According to claim 10, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary-side circulation pump and lowers the target rotational speed by a predetermined rotational speed than before. When the primary circulation pump is operated after correction to the rotational speed and the detection signal from the heating pump cavitation detection means is received thereafter, the primary circulation pump is stopped and the target rotational speed is set to be higher than before. Cavitation occurs even when the primary side circulation pump is operated by repeatedly performing the control to operate the primary side circulation pump by correcting the rotation number to a low number of rotations until no detection signal is received from the heating pump cavitation detection means. Without heating, perform the heating operation in the maximum state without causing poor circulation in the primary side circulation circuit. Those capable of tufts.

  According to the eleventh aspect, when the heating control unit receives the detection signal from the heating pump cavitation detecting means, the heating control unit stops the primary side circulation pump, thereby causing noise generated in the primary side circulation pump due to cavitation. And vibration and erosion can be minimized, the life of the primary circulation pump can be prevented from shortening, and the discharge side and suction side of the primary circulation pump are connected. By adjusting the heating flow rate adjustment valve provided in the middle of the heating pump bypass pipe to a predetermined opening and adjusting the flow rate of hot water flowing through the heating pump bypass pipe, that is, the flow rate returning to the suction side of the primary circulation pump The pressure applied to the suction side of the primary circulation pump can be compensated, and the possibility of cavitation occurring even when the primary circulation pump is operated can be reduced. Those are not caused the poor circulation in the circulation circuit.

  According to the twelfth aspect of the present invention, since the heating control unit stops the primary side circulation pump when receiving a detection signal from the heating pump cavitation detection means during heating operation, the primary side circulation pump caused by cavitation Noise, vibration, and erosion that occur in the system can be minimized, and the life of the primary circulation pump can be prevented from being shortened. Adjusting the heating flow rate adjustment valve in the middle of the heating pump bypass pipe connecting the discharge side and the suction side of the primary side circulation pump to a predetermined opening while alerting that it is different from normal heating operation By adjusting the flow rate of the hot water flowing through the heating pump bypass pipe, that is, the flow rate returning to the suction side of the primary circulation pump, the flow is applied to the suction side of the primary circulation pump. Even if the pressure is supplemented and the primary side circulation pump is operated, the possibility of cavitation can be reduced, the circulation failure in the primary side circulation circuit is not caused, and the room is not left in an unheated state. Is.

  According to a thirteenth aspect of the invention, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump and adjusts the heating flow rate adjustment valve to the maximum opening. This maximizes the flow rate returning to the suction side of the primary circulation pump and increases the pressure applied to the suction side of the primary circulation pump.Therefore, no cavitation occurs even if the primary circulation pump is operated. Insufficient circulation in the side circulation circuit is not caused, the room can be heated at the minimum, and the room is not left unheated.

  According to the fourteenth aspect of the present invention, when the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump and adjusts the heating flow rate adjustment valve to the maximum opening. Operate the primary circulation pump, then gradually reduce the opening of the heating flow rate adjustment valve, gradually reduce the flow rate returning to the suction side of the primary circulation pump, and distribute the heating heat exchanger The flow rate of the primary side circulation circuit is increased and the opening is adjusted so that the cavitation of the primary side circulation pump does not occur. Heating capacity can be increased without causing poor circulation in the interior, and the room can be heated.

  According to the fifteenth aspect of the present invention, when the cavitation of the primary side circulation pump occurs, the actual rotation number of the primary side circulation pump obviously increases. Therefore, the heating pump that detects the actual rotation number when the primary side circulation pump operates An actual rotation speed detection means is provided, and the heating pump cavitation detection means generates cavitation of the primary circulation pump based on the actual rotation speed of the primary circulation pump detected by the heating pump actual rotation speed detection means. Therefore, it is possible to reliably detect the occurrence of cavitation of the primary circulation pump by simple control.

  According to a sixteenth aspect of the present invention, a feed water pressure drop detecting means for detecting that the feed water pressure has dropped is provided, and the control section receives the detection signal from the feed water pressure drop detecting means, and the target of the circulation pump is received. Since the rotation speed is set to the minimum rotation speed, cavitation does not occur even if the circulation pump is operated, and circulation failure in the circulation circuit is not caused. It is possible to prevent the noise, vibration and erosion caused by the circulating pump from occurring and to prevent the life of the circulating pump from being shortened.

  According to the seventeenth aspect of the present invention, there is provided a feed water pressure drop detecting means for detecting that the feed water pressure has fallen, and the control section reports an error when receiving a detection signal from the feed water pressure drop detecting means. The user is warned that the boiling operation cannot be performed in a normal state, and the error is canceled in the boiling operation of boiling the hot water in the hot water storage tank by operating the heating means and the circulation pump. In this way, it is possible to prevent noise, vibration and erosion caused by the circulation pump due to the cavitation of the circulation pump, and to prevent the life of the circulation pump from being shortened. Even when performing a lifting operation, it can be used in a safe and secure state.

  According to the eighteenth aspect of the present invention, a feed water pressure drop detecting means for detecting a drop in the feed water pressure is provided, and the control unit receives a detection signal from the feed water pressure drop detecting means and receives the detection signal from the discharge side of the circulation pump. Since the flow adjustment valve in the middle of the pump bypass pipe connecting the suction side and the suction side is set to the maximum opening degree, cavitation does not occur even if the circulation pump is operated, leading to poor circulation in the circulation circuit. In addition, noise, vibration and erosion caused by the circulation pump due to cavitation of the circulation pump can be prevented in advance and the life of the circulation pump can be prevented from being shortened.

  According to the nineteenth aspect of the present invention, since the feed water pressure drop detecting means detects the drop in the feed water pressure based on the feed water pressure detected by the feed water pressure sensor provided in the feed water pipe. With such a configuration, it is possible to reliably detect a decrease in water supply pressure.

  According to claim 20, there is provided a feed water pressure drop detecting means for detecting that the feed water pressure has fallen, and the heating control section receives the detection signal from the feed water pressure drop detecting means, and the primary side circulation pump Since the target rotational speed is set to the minimum rotational speed, cavitation does not occur even if the primary side circulation pump is operated, and circulation failure in the primary side circulation circuit is not caused. Furthermore, it is possible to prevent noise, vibration and erosion generated in the primary side circulation pump due to cavitation of the primary side circulation pump, and to prevent the life of the primary side circulation pump from being shortened.

  Further, according to claim 21, there is provided a feed water pressure drop detecting means for detecting that the feed water pressure has dropped, and the heating control section receives the detection signal from the feed water pressure drop detecting means, and the primary side circulation pump Because the heating flow rate adjustment valve in the middle of the heating pump bypass pipe that connects the discharge side and suction side of the pump is set to the maximum opening degree, the primary side circulation without causing cavitation even if the primary side circulation pump is operated It does not cause poor circulation in the circuit, and further prevents noise, vibration and erosion caused by the circulation pump due to cavitation of the primary circulation pump, and shortens the life of the primary circulation pump. Can be prevented in advance.

  According to the twenty-second aspect, since the feed water pressure drop detecting means detects that the feed water pressure has dropped based on the feed water pressure detected by the feed water pressure sensor provided in the feed water pipe. It is possible to reliably detect a decrease in the water supply pressure with a simple configuration.

Next, a first embodiment of a hot water storage type hot water supply apparatus of the present invention will be described with reference to the drawings.
This hot water storage type hot water supply device boils and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the stored hot water for hot water supply, etc. 1 is a hot water storage for hot water A hot water storage tank unit provided with a tank 2, 3 is a heat pump unit as a heating means for heating hot water in the hot water storage tank 2, 4 is a hot water tap provided in a kitchen or a washroom, etc. 5 is in the vicinity of this hot water tap 4 It is a hot water supply remote controller as a remote control device having a display unit 6 and an operation unit including switches for performing various operation instructions.

  The hot water storage tank 2 of the hot water storage tank unit 1 is connected with a hot water discharge pipe 7 at the upper end, a water supply pipe 8 at the lower end, an outgoing pipe 10 constituting a circulation circuit 9 at the lower part, and a circulation circuit 9 at the upper part. A return pipe 11 is connected, the hot water storage tank 2 and the heat pump unit 3 are connected in a circulating manner, and the hot water in the hot water storage tank 2 taken out from the forward pipe 10 is heated by the heat pump unit 3 and stored in the return pipe 11. The hot water in the hot water storage tank 2 is pushed up by the water supplied from the water supply pipe 8, and the hot water in the upper part of the hot water storage tank 2 is supplied from the hot water discharge pipe 7.

  A freezing bypass pipe 12 is branched from the middle of the return pipe 11. One end of the freezing bypass pipe 12 is connected to the middle of the return pipe 11 via a switching valve 13 as a flow path switching means, and the other end is a hot water storage tank. This switching valve 13 is connected to the first state of switching the flow path from the forward pipe 10 to the lower part of the hot water storage tank 2 (to the bypass side) via the freezing bypass pipe 12 and the forward pipe 10. Can be set to a second state in which the flow path is switched to the upper part of the hot water storage tank 2 via the return pipe 11 (to the boiling side).

  14 is a water supply bypass pipe that branches off from the water supply pipe 8 and bypasses the hot water storage tank 2. A valve 16 is a hot water supply pipe for supplying hot water mixed in the hot water supply mixing valve 15 to the hot water tap 4, and 17 is a temperature of hot water mixed in the hot water supply mixing valve 15 provided in the hot water supply pipe 16 immediately after the hot water mixing valve 15. A hot water supply temperature sensor 18 for detection detects a hot water flow rate counter for counting the amount of hot water to be supplied. The hot water mixing valve 15 is driven by a motor that moves the valve body so that the temperature detected by the hot water temperature sensor 17 becomes the hot water set temperature set by the hot water remote controller 5 to control the mixing ratio. is there.

  Reference numeral 19 denotes an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 20 denotes a water supply temperature sensor for detecting the temperature of the water supply, 21 denotes a pressure reduction valve for reducing the pressure of the water supply, and the pressure reduction valve 21 is the hot water in the hot water storage tank 2. It also has the function of a check valve that does not flow back to the upstream side of the pressure reducing valve 21. In addition, 22 is connected to the outdoor water supply pipe 8 to prevent the water supply pipe 8 from freezing by draining the water in the water supply pipe 8 upstream of the pressure reducing valve 21 in the winter in the cold districts and regions where freezing is possible. It is an antifreeze faucet.

  A plurality of hot water storage temperature sensors 23 are provided in the vertical direction of the side surface of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors 23 are arranged, and temperature information detected by the hot water storage temperature sensors 23 is provided. Thus, the amount of heat remaining in the hot water storage tank 2 is detected, and the vertical temperature distribution in the hot water storage tank 2 is detected. Reference numeral 24 denotes a hot water storage control unit having a microcomputer that receives the input of each sensor in the hot water tank unit 1 and controls the operation of each actuator, and is connected to the hot water remote controller 5 so as to be communicable.

  The heat pump unit 3 includes a compressor 25 having a variable number of revolutions for compressing a refrigerant, a water refrigerant heat exchanger 26 as a condenser, an electronic expansion valve 27 as a decompression unit, and air heat as a forced air-cooled evaporator. A heat pump circuit 29 composed of an exchanger 28, a circulation pump 30 provided in the forward pipe 10 for circulating hot water in the hot water storage tank 2 to the water-refrigerant heat exchanger 26, and an outdoor air blowing to the air heat exchanger 28 A fan 31, an outside air temperature sensor 32 as an outside air temperature detecting means for detecting the temperature of the outside air, and a heat inlet for detecting the temperature of hot water supplied to the water / refrigerant heat exchanger 26 provided in the forward pipe 10 in the heat pump unit 3. A temperature sensor 33; a heat exchange outlet temperature sensor 34 that is provided in the return pipe 11 in the heat pump unit 3 and that detects the temperature of hot water flowing out of the water / refrigerant heat exchanger 26; Control of the operation of the compressor 25, the electronic expansion valve 27, the outdoor fan 31 and the target rotational speed of the circulation pump 30 during the boiling operation of boiling hot water in the tank 2 and setting the target rotational speed of the circulating pump 30 to operate the circulating pump 30 at the target rotational speed And a heat pump control unit 35 as a control unit for performing control such as carbon dioxide is used as a refrigerant in the heat pump circuit 29 to constitute a supercritical heat pump cycle. The heat pump control unit 35 is communicably connected to the hot water storage control unit 24.

  The heat pump control unit 35 detects cavitation of the circulation pump 30 when the circulation pump 30 is operated, and receives a signal from the circulation pump 30 when the circulation pump 30 is operated. It has an actual rotational speed detecting means 37 for detecting the rotational speed. Note that the cavitation of the circulation pump 30 is caused by, for example, the water storage tank 2 being shut off or when the antifreeze faucet 22 is opened in winter and the water in the water supply pipe 8 is drained upstream of the pressure reducing valve 21. May occur when the circulation pump 30 is operated in a boiling operation for heating the hot water in the hot water storage tank 2 or for preventing the freezing of the circulation circuit 9 in a state where the feed water pressure is reduced or shut off. When cavitation of the circulation pump 30 occurs, the actual rotation speed of the circulation pump 30 exceeds the normal operating range (for example, 300 rpm to 4000 rpm) during the boiling operation or the freeze prevention of the circulation circuit 9 (for example, 300 rpm to 4000 rpm). 7000 rpm), the cavitation detection means 36 has a rotation speed detected by the actual rotation speed detection means 37 of a predetermined rotation speed (for example, 6 rpm). 00 rpm) is exceeded, and if it exceeds the predetermined rotational speed, a detection signal is output to the heat pump control unit 35, and it is easy to detect the actual rotational speed of the circulation pump 30. The occurrence of cavitation of the circulation pump 30 can be detected.

Next, the operation of the first embodiment will be described.
First, the boiling operation will be described. When the hot water storage control unit 24 detects that the hot water storage temperature sensor 23 does not have the amount of heat necessary for the next day in the hot water storage tank 2 during the midnight power period, the hot water storage control unit 24 needs the next day. The amount of stored hot water that will be stored is calculated, and a boiling start command is issued to the heat pump control unit 35. Upon receiving the command, the heat pump control unit 35 starts the operation of the compressor 25 and the circulation pump 30. The switching valve 13 at this time is in a second state, that is, a state in which the flow path is switched to the boiling side (upper side of the hot water storage tank 2), and is taken out from the forward pipe 10 connected to the lower part of the hot water storage tank 2. The low-temperature water is heated to a high temperature by the water-refrigerant heat exchanger 26, returned to the hot water storage tank 2 from the return pipe 11 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 to store the hot water. Go. When the hot water storage temperature sensor 23 detects that the necessary amount of heat has been stored, the hot water storage control unit 24 issues a boiling stop command to the heat pump control unit 35, and the heat pump control unit 35 operates the compressor 25 and the circulation pump 30. Is stopped and the boiling operation is terminated. Further, when the necessary amount of heat does not remain in the hot water storage tank 2 even in a time zone other than the midnight power time zone, the boiling operation is performed.

  Next, the freezing prevention operation of the circulation circuit 9 at a low outside air temperature will be described. When the outside air temperature detected by the outside air temperature sensor 32 is detected to be equal to or lower than a predetermined temperature, the heat pump control unit 35 sets the switching valve 13 to the first state. That is, the flow path is switched to the freezing bypass pipe 12 side, the operation of the circulation pump 30 is started, and the low-temperature water taken out from the forward pipe 10 connected to the lower part of the hot water storage tank 2 is converted into the water / refrigerant heat exchanger 26 and the return pipe 11. The freezing of the circulation circuit 9 is prevented by circulating the freezing bypass pipe 12 in order. Then, for example, when the preset predetermined time has elapsed and the temperature of the hot water detected by the heat exchange inlet temperature sensor 33 or the heat exchange outlet temperature sensor 34 is equal to or higher than the predetermined temperature, the operation of the circulation pump 30 is performed. The operation is stopped and the freeze prevention operation of the circulation circuit 9 is completed. In addition, when the possibility of freezing of the circulation circuit 9 is not solved only by circulation by the operation of the circulation pump 30, the compressor 25 is operated with low capacity, and hot water circulating in the circulation circuit 9 is exchanged by the water / refrigerant heat exchanger 26. Heating prevents the circulation passage 9 from freezing.

  Next, the operation when the cavitation of the circulation pump 30 occurs during the freeze prevention operation will be described with reference to the flowchart shown in FIG. 3. The heat pump control unit 35 is based on the outside air temperature detected by the outside air temperature sensor 32. Then, it is determined whether or not the outside air temperature has become a predetermined temperature, for example, 3 ° C. or less (step S1), and if it is determined that the outside air temperature has become the predetermined temperature or less, it is determined that it is necessary to prevent the circulation circuit 9 from freezing. Switch to the first state, that is, the freeze bypass pipe 12 side, set the target rotational speed (for example, 2000 rpm) of the circulation pump 30 for the freeze prevention operation, start the operation of the circulation pump 30 and start the freeze prevention operation (step) S2), controlling the circulation pump 30 to operate (operate) at the target rotational speed. Subsequently, the actual rotation detecting unit 37 detects the actual number of rotations of the circulation pump 30 (step S3), and the heat pump control unit 35 determines whether or not there is a detection signal output from the cavitation detecting unit 36 (step S3). Step S4).

  Here, in step S4, the cavitation detecting means 36 monitors the actual rotational speed of the circulating pump 30 detected by the actual rotational speed detecting means 37, and the actual rotational speed detecting means 37 detects it based on the actual rotational speed. It is determined whether the rotational speed exceeds a predetermined rotational speed (for example, 6000 rpm). If the rotational speed exceeds the predetermined rotational speed, it is detected that cavitation of the circulation pump 30 has occurred, and the heat pump control unit 35 The cavitation of the circulation pump 30 is, for example, when the water in the water supply pipe 8 is opened upstream of the pressure reducing valve 21 by opening the antifreeze faucet 22 in the winter or the like. When the supply water pressure applied to the hot water storage tank 2 is reduced or shut off due to the removal of the water, the circulation pump 30 is operated to prevent the circulation circuit 9 from freezing, In which may occur with the circulation pump 30 is operated in performing an operation.

  When receiving the detection signal from the cavitation detection means 36 in step S4, the heat pump control unit 35 stops the circulation pump 30 (step S5), and corrects the target rotational speed to a lower rotational speed than before, in this case the target The rotation speed is corrected to the minimum rotation speed (for example, 300 rpm) (step S6), the operation of the circulation pump 30 is started again (step S7), and the freezing prevention of the circulation circuit 9 is continued. It is determined whether or not the prevention has been completed (step S8). For example, when a predetermined time elapses in advance, the temperature of hot water detected by the heat inlet temperature sensor 33 at that time exceeds a predetermined temperature (for example, 10 ° C.). If it is determined that the freeze prevention of the circulation circuit 9 is completed, the operation of the circulation pump 30 is stopped and the freeze prevention operation of the circulation circuit 9 is ended.

  On the other hand, if it is determined in step S4 that cavitation of the circulation pump 30 has not occurred, the heat pump control unit 35 determines whether or not the freezing prevention of the circulation circuit 9 has been completed (step S9), and the freezing is performed in step S9. If it is determined that the prevention has been completed, the operation of the circulation pump 30 is stopped and the freeze prevention operation of the circulation circuit 9 is terminated. If it is determined in step S9 that the prevention of the freeze has not been completed, the step is again performed. It returns to the process of S3. If the possibility of freezing of the circulation circuit 9 is not solved by circulation only by the operation of the circulation pump 30 in the above-described freeze prevention operation, the compressor 25 is operated with low capacity, and hot water circulating through the circulation circuit 9 is supplied. The water refrigerant heat exchanger 26 may be used for heating.

  In the operation when the cavitation of the circulation pump 30 occurs during the anti-freezing operation described above, when the cavitation detection means 36 detects the cavitation of the circulation pump 30 in the step S4, the heat pump control unit 35 detects from the cavitation detection means 36. Since the signal is received and the circulation pump 30 is stopped in the step S5, noise, vibration and erosion caused by the circulation pump 30 due to cavitation can be minimized, and the life of the circulation pump 30 is prevented from being shortened. Furthermore, by correcting the target rotation speed of the circulation pump 30 to a lower rotation speed than before in step S6, there is a possibility that cavitation may occur even if the circulation pump 30 is operated. It can be reduced. In the first embodiment, since the target rotational speed is corrected to the minimum rotational speed in step S6, cavitation does not occur even if the circulation pump 30 is operated thereafter, and the circulation in the circulation circuit 9 occurs. The freezing of the circulation circuit 9 can be prevented without causing a defect.

  Further, when cavitation of the circulation pump 30 occurs, the actual rotation speed of the circulation pump 30 becomes an abnormal rotation speed exceeding the operation range normally used when the circulation circuit 9 is prevented from freezing. The detection means 37 detects the actual rotation speed when the circulation pump 30 is operated, and the cavitation detection means 36 monitors the actual rotation speed of the circulation pump 30 detected by the actual rotation speed detection means 37, and the circulation pump is based on the actual rotation speed. Since it is detected that 30 cavitations have occurred, it is possible to reliably detect the occurrence of cavitation of the circulation pump 30 with simple control.

  Next, the operation when the cavitation of the circulation pump 30 occurs during the boiling operation will be described with reference to the flowchart shown in FIG. 4. The hot water storage control unit 24 performs boiling based on the temperature information detected by the hot water temperature sensor 23. It is determined whether or not to start (step S10), and when it is determined that boiling of the hot water in the hot water storage tank 2 is necessary, the hot water storage control unit 24 issues a start command for the boiling operation to the heat pump control unit 35. Upon receiving the command, the heat pump control unit 35 starts the operation of the compressor 25, sets the target rotation speed of the circulating pump 30 for the boiling operation, starts the operation of the circulating pump 30, and starts the hot water in the hot water storage tank 2. Is started, and the circulating pump 30 is controlled to operate at the target rotational speed. Note that the switching valve 13 at this time is in the second state, that is, the state switched to the boiling side (the upper side of the hot water storage tank 2). Subsequently, the actual rotation speed detection means 37 detects the actual rotation speed of the circulation pump 30 (step S11), and the heat pump control unit 35 determines whether or not there is a detection signal output from the cavitation detection means 36. (Step S12).

  When receiving the detection signal from the cavitation detection means 36 in step S12, the heat pump control unit 35 stops the operation of the compressor 25 and the circulation pump 30 to stop the boiling operation (step S13) and the hot water supply remote controller 5 An error code indicating that cavitation has occurred in the circulation pump 30 is displayed on the display unit 6 to notify that an error has occurred, for example, by issuing an alarm sound from a speaker (not shown) of the hot water remote controller 5 (step S14). Subsequently, it is determined whether or not the error is released (step S15). When the error is released, the boiling operation is resumed (step S16), and the boiling operation is not performed unless the error is released. Yes. Then, it is determined whether or not the hot water storage control unit 24 has boiled up the amount of hot water storage heat that would have been required from the temperature information detected by the hot water temperature sensor 23, that is, whether or not the boiling has been completed. (Step S17) When it is determined that the boiling is completed, the hot water storage control unit 24 issues a boiling operation stop command to the heat pump control unit 35, and the heat pump control unit 35 stops the operation of the compressor 25 and the circulation pump 30. Then, the boiling operation is completed. In addition, the cancellation | release of the error of said step S15 is made by performing predetermined operation with the hot water supply remote control 5, for example.

  On the other hand, if the heat pump control unit 35 determines in step S12 that cavitation of the circulation pump 30 has not occurred, the hot water storage control unit 24 subsequently boils the hot water in the hot water storage tank 2 from the temperature information detected by the hot water temperature sensor 23. It is determined whether or not the heating has been completed (step S18), and when it is determined that the boiling has been completed, the hot water storage control unit 24 issues a boiling operation stop command to the heatpone control unit 35, and the heatpone control unit 35 performs compression. The operation of the machine 25 and the circulation pump 30 is stopped and the boiling operation is finished. When it is determined that the boiling is not completed, the process returns to the step S11 again.

  In the operation in the case where cavitation of the circulation pump 30 occurs during the boiling operation described above, if the cavitation detection means 36 detects cavitation of the circulation pump 30 in the step S12 during the boiling operation, the heat pump control unit 35 detects the cavitation. In response to the detection signal from the means 36, the boiling operation is stopped in the step S13, so that noise, vibration and erosion caused by the circulation pump 30 due to cavitation can be minimized. It is possible to suppress the shortening of the service life, and further to alert the user by notifying the error in the step S14, and the user can stop the boiling (whether the water has stopped or the antifreeze faucet The water supply pressure was lowered by opening 22) In addition, since the boiling operation is not performed until the error is canceled in step S15, the recurrence of cavitation due to the operation of the circulation pump 30 can be prevented in advance, and the next boiling operation is performed. It can be used in a safe and secure state even when performing.

  Further, when cavitation of the circulation pump 30 occurs, the actual rotational speed of the circulating pump 30 becomes an abnormal rotational speed that exceeds the operating range normally used when the circulation circuit 9 is prevented from freezing. The detection means 37 detects the actual rotation speed when the circulation pump 30 is operated, and the cavitation detection means 36 monitors the actual rotation speed of the circulation pump 30 detected by the actual rotation speed detection means 37, and the circulation pump is based on the actual rotation speed. Since it is detected that 30 cavitations have occurred, it is possible to reliably detect the occurrence of cavitation of the circulation pump 30 with simple control.

  The present invention is not limited to the first embodiment described above. In the first embodiment described above, the circulation pump 30 is provided in the forward pipe 10 in the heat pump unit 3, but the hot water storage tank unit is provided. A circulation pump 30 may be provided in the forward pipe 10 in the 1.

  Further, the cavitation detection means 36 and the actual rotation speed detection means 37 are included in the heat-pump control section 35 as a control section, but the hot water storage control section 24 uses the cavitation detection means 36 and the actual rotation speed as the control section. The hot water storage control unit 24 and the heat pump control unit 35 are combined into one control unit, and the control unit includes the cavitation detection unit 36 and the actual rotation speed detection unit 37. In addition, the cavitation detection means 36 and the actual rotation speed detection means 37 are independently provided in the hot water storage tank unit 1 or the heat pump unit 3 in a state in which communication with the hot water storage control section 24 and the heat pump control section 35 is possible. It may be provided inside.

  In addition, after the error is canceled in the step S15, the boiling operation is resumed in the step S16, and the amount of hot water stored that would have been originally scheduled to be heated up is to be boiled. However, after the error is released in the step S15, the minimum required amount of hot water may be automatically boiled up. However, the running cost can be reduced even if it is performed at a time other than the inexpensive midnight time zone, and the amount of hot water required for hot water supply can be kept to a minimum, and an error occurs in step S15. After the release, the user may manually determine the amount of hot water to boil up manually, so that the user can freely set the hot water amount according to the application and use the hot water effectively One in which it is bet.

Next, a second embodiment of the present invention will be described. In this embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and different configurations and operations are described. Only explained.
Reference numeral 38 denotes a pump bypass pipe that connects the discharge side and the suction side of the circulation pump 30. Reference numeral 39 denotes a flow rate adjustment valve provided in the middle of the pump bypass pipe 38. The flow rate adjustment valve 39 is the circulation described above. When cavitation of the pump 30 has not occurred, the pump 30 is normally closed. Further, when cavitation of the circulation pump 30 occurs, the flow rate of the hot water flowing through the pump bypass pipe 38, that is, from the discharge side of the circulation pump 30 is adjusted by adjusting the opening degree of the flow rate adjustment valve 39 from the closed state. The flow rate returning to the suction side is adjusted, and the pressure applied to the suction side of the circulation pump 30 is compensated to prevent the occurrence of cavitation of the circulation pump 30.

  Next, the operation when the cavitation of the circulation pump 30 occurs during the antifreezing operation in the second embodiment will be described with reference to the flowchart shown in FIG. Based on the detected outside air temperature, it is determined whether or not the outside air temperature has become a predetermined temperature or less (step S19). If it is determined that the outside air temperature has become the predetermined temperature or less, it is determined that it is necessary to prevent the circulation circuit 9 from freezing. The valve 13 is switched to the first state, that is, the freezing bypass pipe 12 side, the target rotational speed of the circulation pump 30 is set, the operation of the circulation pump 30 is started, and the freeze prevention operation is started (step S20). Control to operate at the target speed. Subsequently, the actual rotation detecting unit 37 detects the actual number of rotations of the circulation pump 30 (step S21), and the heat pump control unit 35 determines whether or not a detection signal is output from the cavitation detecting unit 36 (step S21). Step S22).

  Here, in step S22, the cavitation detecting means 36 monitors the actual rotational speed of the circulation pump 30 detected by the actual rotational speed detecting means 37, and the rotation detected by the actual rotational speed detecting means 37 based on the actual rotational speed. It is determined whether the number exceeds a predetermined number of rotations (for example, 6000 rpm). If the number exceeds the predetermined number of rotations, it is detected that cavitation of the circulation pump 30 has occurred, and the heat pump control unit 35 The cavitation of the circulation pump 30 is, for example, when the water in the water supply pipe 8 is opened upstream of the pressure reducing valve 21 by opening the antifreeze faucet 22 in the winter or the like. Occurs when the circulation pump 30 is operated to prevent freezing of the circulation circuit 9 in a state where the supply water pressure applied to the hot water storage tank 2 is lowered or shut off due to being pulled out. One in which there is it.

  In step S22, when receiving the detection signal from the cavitation detection means 36, the heat pump control unit 35 stops the circulation pump 30 (step S23), and adjusts the flow rate adjustment valve 39 to a predetermined opening degree. The maximum opening is adjusted so that the valve 39 is opened from the closed state (step S24), the operation of the circulation pump 30 is started again (step S25), and the freezing prevention of the circulation circuit 9 is continued. It is determined whether or not the freeze prevention has been completed (step S26). For example, when a predetermined time has elapsed, the temperature of hot water detected by the heat inlet temperature sensor 33 becomes equal to or higher than the predetermined temperature, and the circulation circuit is reached. If it is determined that the freeze prevention of the circulation circuit 9 is completed, the operation of the circulation pump 30 is stopped and the freeze prevention operation of the circulation circuit 9 is completed.

  On the other hand, if it is determined in step 22 that cavitation of the circulation pump 30 has not occurred, the heat pump control unit 35 determines whether or not the freezing prevention of the circulation circuit 9 has been completed (step S27), and the freezing is performed in step S27. If it is determined that the prevention is completed, the operation of the circulation pump 30 is stopped and the freeze prevention operation of the circulation circuit 9 is terminated. If it is determined in step S27 that the prevention of the freeze is not completed, the step is again performed. It returns to the process of S21. If the possibility of freezing of the circulation circuit 9 is not solved by circulation only by the operation of the circulation pump 30 in the above-described freeze prevention operation, the compressor 25 is operated with low capacity, and hot water circulating through the circulation circuit 9 is supplied. The water refrigerant heat exchanger 26 may be used for heating.

  In the operation in the case where cavitation of the circulation pump 30 occurs during the anti-freezing operation of the second embodiment described above, when the cavitation detection means 36 detects cavitation of the circulation pump 30 in step S22, the heat pump control unit 35 performs cavitation. Since the circulating pump 30 is stopped in step S23 in response to the detection signal from the detecting means 36, noise, vibration and erosion caused by the circulating pump 30 due to cavitation can be minimized, and the circulating pump 30 When the life of the circulating pump 30 is resumed in step S25 by adjusting the opening of the flow rate adjusting valve 39 to a predetermined opening in step S24. The flow rate of hot water flowing through the pump bypass pipe 38, that is, the circulation pump Can compensate for the pressure on the suction side of the circulation pump 30 and adjust the flow rate to return to the suction side of 30, even by operating the circulation pump 30 is capable of reducing the risk of cavitation. In the second embodiment, by adjusting the flow rate adjustment valve 39 to the maximum opening in step S24, the flow rate returning to the suction side of the circulation pump 30 is maximized, and the pressure applied to the suction side of the circulation pump 30 is large. Therefore, cavitation does not occur even if the operation of the circulation pump 30 is restarted in step S25, and freezing of the circulation circuit 9 can be prevented without causing a circulation failure in the circulation circuit 9. is there.

  Further, when cavitation of the circulation pump 30 occurs, the actual rotation speed of the circulation pump 30 becomes an abnormal rotation speed that exceeds the operation range normally used when the circulation circuit 9 is prevented from freezing. The detection means 37 detects the actual rotation speed when the circulation pump 30 is operated, and the cavitation detection means 36 monitors the actual rotation speed of the circulation pump 30 detected by the actual rotation speed detection means 37, and the circulation pump is based on the actual rotation speed. Since it is detected that 30 cavitations have occurred, it is possible to reliably detect the occurrence of cavitation of the circulation pump 30 with simple control.

Next, a third embodiment of the present invention will be described. In this embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. Only explained.
40 is a heating heat exchanger for heating the heating medium (antifreeze) of the heating terminal 41, 42 is a primary side circulation circuit that connects the hot water storage tank 2 and the heating heat exchanger 40 in a circulating manner, and 43 is a primary side circulation. A primary-side circulation pump 44 provided in the circuit 42 is a primary-side heat exchange outlet temperature sensor for detecting the temperature of hot water in the primary-side circulation circuit 42 that has flowed out of the heating heat exchanger 40, and the primary-side circulation pump 43 The high temperature water taken out from the upper part of the hot water storage tank 2 is circulated to the heating heat exchanger 40 by the operation of the hot water storage tank 2, and the intermediate hot water whose temperature is lowered by the heat exchange in the heating heat exchanger 40 is returned to the intermediate position of the hot water storage tank 2. It is.

  45 is a secondary side circulation circuit that connects the heat exchanger 40 for heating and the heating terminal 41 so that circulation is possible, 46 is a secondary side circulation pump provided in the secondary side circulation circuit 45, and 47 is a secondary side circulation circuit. An expansion tank that absorbs the thermal expansion of the heat medium circulating in 45, 48 is a secondary side heat entrance temperature sensor that detects the temperature of the heat medium of the secondary side circulation circuit 45 that flows into the heating heat exchanger 40, 49 Is a secondary-side heat exchange outlet temperature sensor that detects the temperature of the heat medium in the secondary-side circulation circuit 45 that has flowed out of the heating heat exchanger 40, and 50 is an instruction for starting and stopping the heating terminal 41 and a set temperature It is a heating operation instruction means, and the heating medium of the heating terminal 41 is circulated to the heating heat exchanger 40 by the operation of the secondary side circulation pump 46, and is heated by the high temperature water on the primary side in the heating heat exchanger 40. A heating medium used for heating or drying at the heating terminal 41 A.

  51 receives inputs from the primary side heat exchange outlet temperature sensor 44, the secondary side heat exchange inlet temperature sensor 48, and the secondary side heat exchange outlet temperature sensor 49, and receives the primary side circulation pump 43 and the secondary side circulation pump 46. Is a heating control unit that controls the primary side circulation pump 43 and the secondary side circulation pump 46 to operate at the target rotation number. Here, the target rotation number of the primary side circulation pump 43 is the primary side While the heating control unit 51 changes appropriately upon receiving inputs of the heat exchange outlet temperature sensor 44, the secondary side heat exchange inlet temperature sensor 48, and the secondary side heat exchange outlet temperature sensor 49, the secondary side circulation It is assumed that the target rotational speed of the pump 46 is constant. The heating control unit 51 is communicably connected to the heating operation instruction unit 50 and the hot water storage control unit 24.

  The heating control unit 51 includes a heating pump cavitation detection unit 52 that detects that cavitation of the primary side circulation pump 43 has occurred when the primary side circulation pump 43 is operated, and a primary side circulation pump 43 that is in operation when the primary side circulation pump 43 is activated. And a heating pump actual rotational speed detection means 53 for detecting the actual rotational speed of the primary circulation pump 43 in response to the signal from the primary side circulation pump 43. Note that the cavitation of the primary circulation pump 43 is caused by, for example, water storage when the water in the water supply pipe 8 is drained upstream of the pressure reducing valve 21 by opening the antifreeze faucet 22 in winter or the like. There is a risk that this occurs when the heating operation by the heating terminal 41 is performed or the primary side circulation pump 43 is operated to prevent freezing of the primary side circulation circuit 42 in a state where the feed water pressure applied to the tank 2 is lowered or shut off. However, when cavitation of the primary side circulation pump 43 occurs, the actual rotational speed of the primary side circulation pump 43 is the operating range normally used during the heating operation and when the primary side circulation circuit 42 is prevented from freezing (for example, 300 rpm to 4000 rpm). Therefore, the heating pump cavitation detecting means 52 detects the actual number of rotations of the heating pump. It is determined whether or not the rotational speed detected in 53 exceeds a predetermined rotational speed (for example, 6000 rpm), and if it exceeds the predetermined rotational speed, a detection signal is output to the heating control unit 51, By detecting the actual rotational speed of the primary side circulation pump 43, the occurrence of cavitation in the primary side circulation pump 43 can be easily detected.

Next, the operation of the third embodiment will be described.
First, the freezing prevention operation of the primary side circulation circuit 42 at the time of low outside air temperature will be described. The hot water temperature detected by the primary side heat exchange outlet temperature sensor 44 or the outside air temperature detected by the outside air temperature sensor 32 is detected to be a predetermined temperature or less. Sometimes, the heating control unit 51 sets the target rotational speed of the primary side circulation pump 43 and starts the operation of the primary side circulation pump 43 to circulate the hot water taken out from the upper part of the hot water storage tank 2 in the primary side circulation circuit 42. The primary side circulation circuit 42 is prevented from freezing, and when the hot water temperature detected by the primary side heat exchange outlet temperature sensor 44 detects a predetermined temperature or higher, the operation of the primary side circulation pump 43 is stopped and the primary side circulation is detected. The freeze prevention operation of the circuit 42 is terminated.

  Next, the heating operation by the heating terminal 41 will be described. When the heating operation instruction means 50 instructs the start of heating, and the heating control unit 51 receives the input signal, the primary side circulation pump 43 and the secondary side circulation pump. The target rotational speed of 46 is set, the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 is started, and the high-temperature water in the hot water storage tank 2 is circulated to the heating heat exchanger 40 so that the secondary side circulation circuit 45 The heat medium in the secondary side circulation circuit 45 is heated by exchanging heat with the internal heat medium, and the heated heat medium is radiated by the heating terminal 41 so that the heating operation in the room where the heating terminal 41 is installed is performed. It is what is said. At this time, the heating control unit 51 includes the primary side heat exchange outlet temperature sensor 44, the secondary side so that the detection temperature of the secondary side heat exchange outlet temperature sensor 49 provided in the secondary side circulation circuit 45 becomes a predetermined temperature. Based on the temperature detected by the heat exchange inlet temperature sensor 48 and the secondary side heat exchange outlet temperature sensor 49, the target rotational speed of the primary side circulation pump 43 is appropriately set to control the operation of the primary side circulation pump 43. When the heating operation instruction means 50 instructs to stop heating, the heating control unit 51 receives the input signal, stops the operation of the primary side circulation pump 43 and the secondary side circulation pump 46, and ends the heating operation. Is.

  Next, the operation in the case where cavitation of the primary side circulation pump 43 occurs during the freeze prevention operation will be described using the flowchart shown in FIG. 10. The heating control unit 51 detects the primary side heat exchange outlet temperature sensor 44. On the basis of the hot water temperature to be detected or the outside air temperature detected by the outside air temperature sensor 32, for example, it is determined whether or not the hot water temperature detected by the primary heat exchange outlet temperature sensor 44 has become a predetermined temperature (for example, 3 ° C.) or less ( In step S28), when it is determined that the hot water temperature detected by the primary side heat exchange outlet temperature sensor 44 has become equal to or lower than a predetermined temperature, it is determined that the primary side circulation circuit 42 needs to be prevented from freezing. A target rotational speed (for example, 2000 rpm) is set, the operation of the primary circulation pump 43 is started, and the freeze prevention operation is started (step S29). The circulation pump 43 is controlled so as to operate at the target rotation speed. Subsequently, the heating pump actual rotation detecting means 53 detects the actual number of revolutions of the primary circulation pump 43 (step S30), and the heating control unit 51 outputs a detection signal from the heating pump cavitation detecting means 52. It is determined whether or not (step S31).

  Here, in the step S31, the heating pump cavitation detecting means 52 monitors the actual rotational speed of the primary side circulation pump 43 detected by the heating pump actual rotational speed detecting means 53, and based on the actual rotational speed, the heating pump actual rotational speed is monitored. It is determined whether or not the rotation speed detected by the number detection means 53 exceeds a predetermined rotation speed (for example, 6000 rpm). If the rotation speed exceeds the predetermined rotation speed, cavitation of the primary circulation pump 43 has occurred. And the detection signal is output to the heating control unit 51. The cavitation of the primary side circulation pump 43 is, for example, when the water is shut down or the antifreeze faucet 22 is opened in winter and the pressure reducing valve 21 in the state where the water supply pressure applied to the hot water storage tank 2 is lowered or shut off due to the water in the water supply pipe 8 being drained on the upstream side of the valve 21. Or to operate the primary side circulation pump 43 for forming anti, in which may occur with operating the primary side circulation pump 43 by the heating operation.

  In step S31, when the heating control unit 51 receives a detection signal from the heating pump cavitation detection means 52, the heating controller 51 stops the primary side circulation pump 43 (step S32), and corrects the target rotational speed to a lower rotational speed than before. Here, the target rotational speed is corrected to the minimum rotational speed (for example, 300 rpm) (step S33), the operation of the primary side circulation pump 43 is started again (step S34), and the freezing prevention of the primary side circulation circuit 42 is continued. Thereafter, it is determined whether or not the prevention of freezing of the primary side circulation circuit 42 has been completed (step S35). If it is determined that the anti-freezing of 42 has been completed, the operation of the primary-side circulation pump 43 is stopped and the anti-freezing operation of the primary-side circulation circuit 42 is terminated. It is.

  On the other hand, if the heating control unit 51 determines in step S31 that cavitation of the primary circulation pump 43 has not occurred, it determines whether or not the prevention of freezing of the primary circulation circuit 42 has been completed (step S36). If it is determined in step S36 that the freeze prevention has been completed, the operation of the primary side circulation pump 43 is stopped and the freeze prevention operation of the primary side circulation circuit 42 is terminated. In step S36, the freeze prevention has been completed. If it is determined that there is no, the process returns to step S30 again.

  In the operation in the case where cavitation of the primary side circulation pump 43 occurs during the anti-freezing operation described above, when the heating pump cavitation detection means 52 detects cavitation of the primary side circulation pump 43 in step S31, the heating control unit 51 performs heating. In response to the detection signal from the pump cavitation detecting means 52, the primary circulation pump 43 is stopped in step S32, so that noise, vibration and erosion generated in the primary circulation pump 43 due to cavitation can be minimized. And the life of the primary circulation pump 43 can be prevented from being shortened, and the target rotational speed of the primary circulation pump 43 is corrected to a lower rotational speed than before in step S33. In step S34, the operation of the primary side circulation pump 43 is resumed. Even if those which can reduce the risk of cavitation. In the third embodiment, since the target rotational speed is corrected to the minimum rotational speed in step S33, cavitation does not occur even if the primary circulation pump 43 is operated in step S34, and the primary circulation is performed. The primary side circulation circuit 42 can be prevented from freezing without causing a circulation failure in the circuit 42.

  Further, when cavitation of the primary side circulation pump 43 occurs, the abnormal rotation number in which the actual rotation number of the primary side circulation pump 43 exceeds the operation range (for example, 300 to 2000 rpm) normally used when the primary side circulation circuit 42 is prevented from freezing. (For example, 7000 prm), the actual rotation speed when the primary circulation pump 43 is operated is detected by the heating pump actual rotation speed detection means 53 in step S30, and the heating pump cavitation detection means 52 is the heating pump actual rotation speed detection means. 53, the actual rotational speed of the primary side circulation pump 43 detected is detected, and the occurrence of cavitation of the primary side circulation pump 43 is detected based on the actual rotational speed. Therefore, the primary side circulation pump 43 can be reliably controlled by simple control. It is possible to detect the occurrence of cavitation.

  Next, the operation when cavitation of the primary circulation pump 43 occurs during the heating operation will be described using the flowchart shown in FIG. 11. The heating control unit 51 instructs the heating operation instruction means 50 to start the heating operation. When the signal is received, the target rotation speed of the primary circulation pump 43 and the secondary circulation pump 46 (for example, the target rotation speed of the primary circulation pump 43 is set to 3500 rpm) is set, and the primary circulation pump 43 and the secondary circulation are set. When the operation of the pump 46 is started and the heating operation is started, the heating pump actual rotational speed detection means 53 detects the actual rotational speed of the primary side circulation pump 43 (step S37), and the heating control unit 51 performs the heating pump. It is determined whether there is a detection signal output from the cavitation detection means 52 (step S38).

  Here, in step S38, the heating pump cavitation detecting means 52 monitors the actual rotational speed of the primary circulation pump 43 detected by the heating pump actual rotational speed detecting means 53, and based on the actual rotational speed, the heating pump actual rotational speed is monitored. It is determined whether or not the rotation speed detected by the number detection means 53 exceeds a predetermined rotation speed (for example, 6000 rpm). If the rotation speed exceeds the predetermined rotation speed, cavitation of the primary circulation pump 43 has occurred. And a detection signal is output to the heating control unit 51. When the heating control unit 51 receives the detection signal from the heating pump cavitation detection means 52, the operation of the primary side circulation pump 43 is stopped (step S1). Along with S39), a signal is sent to the hot water storage control unit 24, and the primary side circulation pump 43 cavitates the display unit 6 of the hot water remote controller 5. An error code signifying that the error has occurred is displayed to notify that an error has occurred, for example, by issuing an alarm sound from a speaker (not shown) of the hot water remote controller 5 (step S40). In this case, the target rotational speed is corrected to a rotational speed lower by a predetermined rotational speed (for example, 300 rpm) than before (step S41), and the operation of the primary circulation pump 43 is started again (step S41). S42), the heating operation is resumed. At this time, the heating control unit 51 is set so that the temperature detected by the secondary side heat exchange outlet temperature sensor 49 provided in the secondary side circulation circuit 45 becomes a predetermined temperature. Is the target rotational speed of the primary circulation pump 43 based on the temperatures detected by the primary side heat exchange outlet temperature sensor 44, the secondary side heat exchange inlet temperature sensor 48, and the secondary side heat exchange outlet temperature sensor 49. Without control of Yichun actuating the primary side circulation pump 43 is set, and controls the operation of the primary side circulation pump 43 on the basis of only the target rotational speed corrected in step S41.

When the operation of the primary circulation pump 43 is started in the step S42 and the heating operation is resumed, the process returns to the process of the step S37. After that, the heating control unit 51 receives a detection signal from the heating pump cavitation detection means 52 in a step S38. If it is received, the primary circulation pump 43 is stopped in step S39, the target rotational speed is corrected to a rotational speed lower by a predetermined rotational speed than in the past in step S41, and the primary circulation pump 43 is operated in step S42. The control to be started is repeatedly performed until the heating control unit 51 does not receive the detection signal from the heating pump cavitation detection unit 52 in step S38. When the heating operation instruction means 50 receives the heating operation stop instruction signal, the heating control unit 51 stops the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 and ends the heating operation.

  Further, during the heating operation, assuming that the cavitation of the primary circulation pump 43 is caused by the opening of the antifreeze faucet 22, an error is reported during the heating operation in step S41, and the primary circulation is performed. When the heating operation is performed while the target rotation speed of the pump 43 is reduced and corrected, the user sees an error and closes the antifreeze faucet 22, and then performs a predetermined operation with the hot water supply remote controller 5, for example. When the error is canceled during the heating operation, for example, after that, the normal heating operation is resumed thereafter.

  In the operation when the cavitation of the primary side circulation pump 43 occurs during the heating operation described above, the heating pump cavitation detection means 52 detects the cavitation of the primary side circulation pump 43 in the step S38 during the heating operation. Since the control unit 51 receives the detection signal from the heating pump cavitation detection means 52 and stops the primary side circulation pump 43 in the step S39, the noise, vibration and erosion generated in the primary side circulation pump 43 due to cavitation are minimized. It can be suppressed to the limit, the life of the primary circulation pump 43 can be prevented from shortening, and further, by notifying the error in the step S40, it is different from the normal heating operation so far. And the user is responsible for the cause of the error ( Or the water supply pressure has decreased due to the opening of the antifreeze faucet 22), and in step S41, the target rotational speed is corrected to a lower rotational speed than before. As a result, even if the operation of the primary side circulation pump 43 is resumed in step S42, the possibility of cavitation occurring can be reduced. It does not end up in a heating state.

  Further, in this third embodiment, when the target rotational speed is corrected to a rotational speed lower than the predetermined rotational speed at step S41, the operation of the primary side circulation pump 43 is started at step S42, and the heating operation is resumed. When the heating control unit 51 receives the detection signal from the heating pump cavitation detecting means 52 in step S38 after that, the primary side circulation pump 43 is stopped in step S39, and the step S41 returns to the process in step S37. The control for correcting the target rotational speed to a rotational speed lower by a predetermined rotational speed than before and starting the operation of the primary circulation pump 43 in step S42 is performed by the heating control unit 51 from the heating pump cavitation detecting means 52 in step S38. The primary side circulation pump 43 is operated by repeatedly performing until the detection signal is not received. Even if cavitation does not occur, the heating operation can be continued in the maximum heating capacity state without causing poor circulation in the primary side circulation circuit 42, and the room in which the heating terminal 41 is installed is brought into an unheated state. There is no.

  Further, when cavitation of the primary side circulation pump 43 occurs, the actual rotation number of the primary side circulation pump 43 becomes an abnormal rotation number (for example, 7000 prm) exceeding the operation range (300 rpm to 4000 rpm) normally used during heating operation. In step S37, the actual rotation speed when the primary side circulation pump 43 is operated is detected by the heating pump actual rotation speed detection means 53, and the heating pump cavitation detection means 52 is detected by the heating pump actual rotation speed detection means 53. Since the actual rotational speed of the pump 43 is monitored and the occurrence of cavitation of the primary circulation pump 43 is detected based on the actual rotational speed, the primary circulation pump 43 can be reliably and easily controlled even during heating operation. It is possible to detect the occurrence of cavitation.

  The present invention is not limited to the third embodiment described above. In the third embodiment described above, the predetermined rotational speed is higher than that of the target rotational speed of the primary circulation pump 43 in step S41. Although the rotational speed is corrected to a low rotational speed, the target rotational speed of the primary side circulation pump 43 may be corrected to the minimum rotational speed (for example, 300 rpm), so that the primary side circulation pump 43 can be operated. Since cavitation does not occur and poor circulation in the primary-side circulation circuit 42 is not caused, minimum heating of the room in which the heating terminal 41 is installed can be performed, and the room is not brought into an unheated state. Is.

  Also, the heating terminal 41 is replaced with a bathtub, the heating heat exchanger 40 is used as a bath heat exchanger, and the secondary circulation circuit 45 is connected to the bathtub and the bath heat exchanger so as to circulate. In this configuration, the bath circulation circuit needs to be prevented from freezing at a low outside temperature, and the primary-side circulation pump 43 and the secondary-side circulation pump 46 are operated. Even if cavitation of the primary side circulation pump 43 due to the opening of the valve or the like occurs, the target rotational speed of the primary side circulation pump 43 is corrected as described above to cause poor circulation of the hot water in the primary side circulation circuit 42. It can be circulated through the bath heat exchanger without heat, and the hot water in the bath circulation circuit on the secondary side can be heat-exchanged and heated by the bath heat exchanger to perform the minimum freezing prevention operation of the bath circulation circuit. Is.

Next, a fourth embodiment of the present invention will be described. In this embodiment, the same parts as those of the third embodiment described above are denoted by the same reference numerals and the description thereof will be omitted and different configurations and operations will be described. Only explained.
54 is a heating pump bypass pipe connecting the discharge side and the suction side of the primary side circulation pump 43, 55 is a heating flow rate adjusting valve provided in the middle of the heating pump bypass pipe 54, and this heating flow rate adjusting valve 55 is When the cavitation of the primary circulation pump 43 described above does not occur, it is normally closed. Further, when cavitation of the primary circulation pump 43 occurs, the flow rate of the hot water flowing through the heating pump bypass pipe 54, that is, the primary circulation is adjusted by opening the heating flow rate adjusting valve 55 so as to open from the closed state. The flow rate returning from the discharge side of the pump 43 to the suction side is adjusted, and the pressure applied to the suction side of the primary side circulation pump 43 is compensated to prevent the occurrence of cavitation in the primary side circulation pump 43.

  Next, the operation in the case where cavitation of the primary circulation pump 43 occurs during the antifreezing operation in the fourth embodiment will be described with reference to the flowchart shown in FIG. Based on the hot water temperature detected by the outlet temperature sensor 44 or the outside air temperature detected by the outside air temperature sensor 32, for example, it is determined whether or not the hot water temperature detected by the primary side heat exchanger outlet temperature sensor 44 has become a predetermined temperature or less. If it is determined that the hot water temperature detected by the primary side heat exchange outlet temperature sensor 44 has become equal to or lower than the predetermined temperature (step S43), it is determined that the primary side circulation circuit 42 needs to be prevented from freezing. 43 is set, the operation of the primary circulation pump 43 is started, and the freeze prevention operation is started (step S44), and the primary circulation pump is started. 3 controls to operate at the target rotation number. Subsequently, the heating pump actual rotation detecting means 53 detects the actual number of revolutions of the primary circulation pump 43 (step S45), and the heating control unit 51 outputs a detection signal from the heating pump cavitation detecting means 52. It is determined whether or not (step S46).

  Here, in step S46, the heating pump cavitation detection means 52 monitors the actual rotation speed of the primary side circulation pump 43 detected by the heating pump actual rotation speed detection means 53, and based on the actual rotation speed, the heating pump actual rotation speed is detected. It is determined whether the rotational speed detected by the number detection means 53 exceeds a predetermined rotational speed (for example, 6000 rpm). If the rotational speed exceeds the predetermined rotational speed, cavitation of the primary circulation pump 43 has occurred. Is detected and the detection signal is output to the heating control unit 51. The cavitation of the primary circulation pump 43 is, for example, when the water is shut down or the antifreeze faucet 22 is opened in winter and the pressure reducing valve. 21 in the state where the water supply pressure applied to the hot water storage tank 2 is lowered or shut off due to the water in the water supply pipe 8 being drained on the upstream side of the valve 21. Or to operate the primary side circulation pump 43 for forming anti, in which may occur with operating the primary side circulation pump 43 by the heating operation.

  In step S46, when the heating control unit 51 receives the detection signal from the heating pump cavitation detection means 52, the primary side circulation pump 43 is stopped (step S47), and the heating flow rate adjustment valve 55 is adjusted to a predetermined opening degree. Here, the heating flow rate adjustment valve 55 is adjusted to the maximum opening so as to be opened from the closed state (step S48), and the operation of the primary side circulation pump 43 is started again (step S49), and the primary side circulation circuit 42 is frozen. Then, it is determined whether or not the prevention of freezing of the primary side circulation circuit 42 has been completed (step S50), and for example, the temperature of the hot water detected by the primary side heat exchange outlet temperature sensor 44 becomes equal to or higher than a predetermined temperature. If it is determined that the freezing prevention of the primary side circulation circuit 42 has been completed, the operation of the primary side circulation pump 43 is stopped and the freezing prevention operation of the primary side circulation circuit 42 is terminated. A.

  On the other hand, if the heating control unit 51 determines in step S46 that cavitation of the primary circulation pump 43 has not occurred, it determines whether or not the freezing prevention of the primary circulation circuit 42 has been completed (step S51), and If it is determined in step S51 that the freeze prevention has been completed, the operation of the primary side circulation pump 43 is stopped and the freeze prevention operation of the primary side circulation circuit 42 is terminated. In step S51, the freeze prevention has been completed. If not, the process returns to step S45 again.

  In the operation in the case where cavitation of the primary side circulation pump 43 occurs during the anti-freezing operation described above, when the heating pump cavitation detection means 52 detects cavitation of the primary side circulation pump 43 in step S46, the heating control unit 51 Since the primary circulation pump 43 is stopped in step S47 upon receiving the detection signal from the pump cavitation detection means 52, it is possible to minimize noise, vibration and erosion caused by the primary circulation pump 43 due to cavitation. In the step S49, the life of the primary circulation pump 43 can be prevented from being shortened, and the heating flow rate adjustment valve 55 is adjusted to a predetermined opening degree in the step S48. When the operation of the primary circulation pump 43 is resumed, the heating pump bypasser By adjusting the flow rate of hot water flowing through the pipe 54, that is, the flow rate returning to the suction side of the primary side circulation pump 43, the pressure applied to the suction side of the primary side circulation pump 43 can be compensated, and the primary side circulation pump 43 is operated. Can reduce the risk of cavitation. In the fourth embodiment, the heating flow rate adjustment valve 55 is adjusted to the maximum opening in step S48, so that the flow rate returning to the suction side of the primary side circulation pump 43 is maximized, and the suction side of the primary side circulation pump 43 is increased. Therefore, even if the operation of the primary side circulation pump 43 is restarted in step S49, cavitation of the primary side circulation pump 43 does not occur, resulting in poor circulation in the primary side circulation circuit 42. It is possible to prevent the primary side circulation circuit 42 from freezing.

  Further, when the cavitation of the primary side circulation pump 43 occurs, the actual rotation number of the primary side circulation pump 43 becomes an abnormal rotation number exceeding the operation range normally used when the primary side circulation circuit 42 is prevented from freezing. In step S 45, the actual rotation speed when the primary circulation pump 43 is operated is detected by the heating pump actual rotation speed detection means 53, and the heating pump cavitation detection means 52 is detected by the heating pump actual rotation speed detection means 53. The actual rotation speed is monitored, and based on the actual rotation speed, it is detected that cavitation of the primary side circulation pump 43 has occurred. Therefore, it is reliably detected that cavitation of the primary side circulation pump 43 has occurred with simple control. It is something that can be done.

  Next, the operation in the case where cavitation of the primary circulation pump 43 occurs during the heating operation will be described using the flowchart shown in FIG. 15. The heating control unit 51 instructs the heating operation instruction means 50 to start the heating operation. When the signal is received, the target rotational speed of the primary side circulation pump 43 and the secondary side circulation pump 46 is set, the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 is started, and the heating operation is started. Then, the heating pump actual rotation speed detection means 53 detects the actual rotation speed of the primary circulation pump 43 (step S52), and the heating control unit 51 determines whether or not there is a detection signal output from the heating pump cavitation detection means 52. Is determined (step S53).

  Here, in the step S53, the heating pump cavitation detecting means 52 monitors the actual rotational speed of the primary side circulation pump 43 detected by the heating pump actual rotational speed detecting means 53, and based on the actual rotational speed, the heating pump actual rotational speed is monitored. It is determined whether the rotational speed detected by the number detection means 53 exceeds a predetermined rotational speed. If the rotational speed exceeds the predetermined rotational speed, it is detected that cavitation of the primary side circulation pump 43 has occurred, When the detection signal is output from the heating pump cavitation detection means 52, the heating control unit 51 stops the operation of the primary circulation pump 43 (step S54) and stores hot water. A signal is sent to the control unit 24 to mean that cavitation has occurred in the primary circulation pump 43 on the display unit 6 of the hot water remote controller 5. -A code is displayed and an alarm is generated from a speaker (not shown) of the hot water remote controller 5 to notify that an error has occurred (step S55). Subsequently, the heating flow rate adjusting valve 55 is set to a predetermined opening, here The heating flow rate adjustment valve 55 is adjusted from the closed state to the maximum opening degree (step S56), the operation of the primary side circulation pump 43 is started again (step S57), and the heating operation is restarted. In the heating operation, the heating control unit 51 controls the primary side heat exchange outlet temperature sensor 44, two so that the temperature detected by the secondary side heat exchange outlet temperature sensor 49 provided in the secondary side circulation circuit 45 becomes a predetermined temperature. Based on the temperature detected by the secondary side heat exchange inlet temperature sensor 48 and the secondary side heat exchange outlet temperature sensor 49, the target rotational speed of the primary side circulation pump 43 is appropriately set and the primary side circulation pump 43 is operated. First, the primary side circulation pump 43 is operated at the target rotational speed set before the occurrence of cavitation, the heating flow rate adjustment valve 55 is adjusted, and the primary side circulation circuit side 42 flowing into the heating heat exchanger 40 is adjusted. Control to adjust the circulation flow rate is performed.

  In step S57, the primary circulation pump 43 is started to start the heating operation, the primary circulation pump 43 is operated at the target rotational speed, and the heating pump actual rotational speed detection means 53 is connected to the primary circulation pump 43. The actual number of revolutions is detected (step S58), the heating control unit 51 determines whether there is a detection signal output from the heating pump cavitation detection means 52 (step S59), and the heating control unit 51 detects the heating pump cavitation. If the detection signal is not received from the means 52, the opening of the heating flow rate adjustment valve 55 is adjusted to decrease the predetermined opening from the maximum opening, for example, the opening is reduced by about 10% from the maximum opening (step S60), step Returning to the process of S58, until the heating control unit 51 receives the detection signal from the heating pump cavitation detection means 52 in step S59, Step S58 → step S59 → step S60 → step S58 → ... repeated process of gradually reducing the degree of opening of the heating the flow control valve 55.

  And if the heating control part 51 receives the detection signal from the heating pump cavitation detection means 52 in the said step S59, the action | operation of the primary side circulation pump 43 will be stopped (step S61), and the opening degree of the heating flow control valve 55 will be changed. In step S59, before the heating control unit 51 receives the detection signal from the heating pump cavitation detecting means 52, that is, the opening degree of the heating flow rate adjustment valve 55 is set to a limit opening degree where cavitation of the primary side circulation pump 43 does not occur. The adjustment is made (step S62), the operation of the primary side circulation pump 43 is started again (step S63), the heating operation is resumed, and the process returns to step S52. When the heating operation instruction means 50 receives the instruction signal for stopping the heating operation, the heating control unit 51 stops the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 and ends the heating operation.

  Further, during the heating operation, assuming that the cavitation of the primary circulation pump 43 is caused by the opening of the antifreeze faucet 22, an error is notified during the heating operation in step S55, and the heating flow rate adjustment is performed. When the heating operation is performed with the valve 55 opened at a predetermined opening, the user sees an error and closes the antifreeze faucet 22, and then performs a predetermined operation with the hot water remote controller 5, for example, When the error is canceled during the heating operation, the flow rate adjustment valve 55 is closed, and thereafter the normal heating operation is resumed.

  In the operation when the cavitation of the primary side circulation pump 43 occurs during the heating operation described above, the heating pump cavitation detection means 52 detects the cavitation of the primary side circulation pump 43 in the step S53 during the heating operation. Since the control unit 51 receives the detection signal from the heating pump cavitation detection means 52 and stops the primary side circulation pump 43 in step S54, noise, vibration and erosion generated in the primary side circulation pump 43 due to cavitation are minimized. It is possible to suppress the life of the primary side circulation pump 43 from being shortened, and to notify the user of an error in step S55, which is different from the normal heating operation so far. The user and the cause of the error It is possible to grasp that the water supply pressure has decreased due to the fact that water has stopped or the antifreeze faucet 22 has been opened, and in addition, in step S56, the heating flow rate adjustment valve 55 is opened to a predetermined level. By adjusting the flow rate of hot water flowing through the heating pump bypass pipe 54, that is, the flow rate returning to the suction side of the primary side circulation pump 43, the pressure applied to the suction side of the primary side circulation pump 43 is compensated, and the primary side Even if the circulation pump 43 is operated, the possibility of cavitation can be reduced. In the fourth embodiment, the heating flow rate adjustment valve 55 is adjusted to the maximum opening in step S56, whereby the primary side circulation is achieved. Since the flow rate returning to the suction side of the pump 43 becomes maximum and the pressure applied to the suction side of the primary side circulation pump 43 increases, the operation of the primary side circulation pump 43 is resumed in step S57. Also is intended not to cavitation of the primary side circulation pump 43 occurs, but never lead to poor circulation in the primary circulation circuit 42.

  In the fourth embodiment, in the processing after step S58, until the heating control unit 51 receives the detection signal from the heating pump cavitation detection means 52 in step S59, step S58 → step S59 → step S60 → step S58. The process of... Is repeated to gradually reduce the opening degree of the heating flow rate adjustment valve 55, reduce the flow rate returning to the suction side of the primary side circulation pump 43, and circulate through the heat exchanger 40 for heating. When the heating control unit 51 receives a detection signal from the heating pump cavitation detection means 52 in step S59, the operation of the primary side circulation pump 43 is stopped in step S61. In step S62, the opening degree of the heating flow rate adjusting valve 55 is set. In step S59, the heating control unit 51 is set to be warm. Before the detection signal from the pump cavitation detecting means 52 is received, that is, the opening degree of the heating flow rate adjusting valve 55 is adjusted to a limit opening degree where cavitation of the primary side circulation pump 43 does not occur, and the primary side circulation is again performed in step S63 Since the operation of the pump 43 is started and the heating operation is resumed, the maximum heating capacity state in which no cavitation occurs even when the primary side circulation pump 43 is operated and the circulation failure in the primary side circulation circuit 42 is not caused. Thus, the heating operation can be continued and the room in which the heating terminal 41 is installed is not brought into an unheated state.

  Further, when cavitation of the primary circulation pump 43 occurs, the actual rotational speed of the primary circulation pump 43 becomes a rotational speed exceeding the operating range normally used during heating operation. The actual rotation speed when the primary circulation pump 43 is operated is detected by the rotation speed detection means 53, and the heating pump cavitation detection means 52 monitors the actual rotation speed of the primary circulation pump 43 detected by the heating pump actual rotation speed detection means 53. In addition, since it is detected that cavitation of the primary circulation pump 43 has occurred based on the actual number of revolutions, it is reliably detected that cavitation of the primary circulation pump 43 has occurred with simple control even during heating operation. Is something that can be done.

  The present invention is not limited to the above fourth embodiment. In the above fourth embodiment, the heating flow rate adjustment valve 55 is adjusted to the maximum opening degree in step S56, and in step S57. The operation of the primary side circulation pump 43 is started again, the opening degree of the heating flow rate adjustment valve 55 is decreased and adjusted in the processing after step S58, and even if the primary side circulation pump 43 is operated, the primary side circulation pump 43 does not generate cavitation. Although the heating operation can be continued in the maximum heating capacity state without causing the circulation failure in the side circulation circuit 42 and the room in which the heating terminal 41 is installed is not brought into the non-heating state, the step S56 is performed. In step S57, the heating flow rate adjusting valve 55 is adjusted to the maximum opening, the primary side circulation pump 43 is started again in step S57, and the heating operation is restarted. The processing up to step S63 may not be performed, so that even if the primary-side circulation pump 43 is operated, cavitation of the primary-side circulation pump 43 does not occur, and the circulation in the primary-side circulation circuit 42 is performed. Minimal heating of the room in which the heating terminal 41 is installed can be performed without causing a defect, and the room is not left unheated.

Next, a fifth embodiment of the present invention will be described. In this embodiment, the same parts as those of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted. Only explained.
56 is a water supply pressure sensor that is provided in the water supply pipe 8 to detect the pressure of the water supply, 57 is a water supply pressure drop detecting means that detects that the water supply pressure has decreased based on the water supply pressure detected by the water supply pressure sensor 56, The feed water pressure drop detecting means 57 is provided in the heat pump control unit 35. The value of the feed water pressure detected by the feed water pressure sensor 56 is sent to the heat pump control unit 35 side via the hot water storage control unit 24 and detected by the feed water pressure drop detecting means 57 of the heat pump control unit 35. Yes, the feed water pressure drop detecting means 57 is based on the detected feed water pressure value, for example, compared with a set pressure value (for example, 170 kPa) of the pressure reducing valve 21, and the detected feed water pressure value is less than the set pressure value. If it is determined that the feed water pressure has decreased, a detection signal is output to the heat pump control unit 35. When the heat pump control unit 35 receives the detection signal from the feed water pressure drop detection means 57, the target rotational speed of the circulation pump 30 is set to a predetermined value. Is set to the number of revolutions. The drop in the water supply pressure occurs when the water supply is cut off or the antifreeze water tap 22 is opened in the winter and the water in the water supply pipe 8 is drained upstream of the pressure reducing valve 21.

  Next, the freezing prevention operation of the circulation circuit 9 when the feed water pressure drop detecting means 57 detects the feed water pressure drop will be described with reference to the flowchart shown in FIG. Based on the value of the feed water pressure detected in step 1, for example, compared with a set pressure value (for example, 170 kPa) of the pressure reducing valve 21, if it is determined that the value of the feed water pressure is equal to or less than the set pressure value, the feed water pressure has decreased. As a detection signal to the heat pump control unit 35, the heat pump control unit 35 determines whether or not there is a detection signal from the feed water pressure drop detection means 57 (step S64), When the detection signal from the feed water pressure drop detection means 57 is received in step S64, the target rotation speed of the circulation pump 30 is set in advance to the minimum rotation speed (for example, 300 rpm). On the other hand, if it is determined in step S64 that the detection signal from the feed water pressure drop detecting means 57 has not been received, the heat pump control unit 35 sets the target rotational speed of the circulation pump 30 to prevent the circulation circuit 9 from freezing. The rotation speed to be used (for example, 2000 rpm) is set (step S66), and then it is determined whether or not the outside temperature detected by the outside temperature sensor 32 is equal to or lower than a predetermined temperature (step S67).

  In step S67, if the heat pump control unit 35 determines that the outside air temperature detected by the outside air temperature sensor 32 is equal to or lower than a predetermined temperature (eg, 3 ° C.), it operates at the target rotational speed set in step S65 or step S66. Thus, the operation of the circulation pump 30 is started (step S68), the freeze prevention operation of the circulation circuit 9 is started, and it is determined whether or not the freeze prevention of the circulation circuit 9 is completed (step S69). If it is determined that the temperature of hot water detected by the heat exchange inlet temperature sensor 33 has reached a predetermined temperature (for example, 10 ° C.) or more and the freezing prevention of the circulation circuit 9 has been completed after the predetermined time has elapsed, the circulation pump The operation of 30 is stopped and the freeze prevention operation of the circulation circuit 9 is ended.

  In the freeze prevention operation of the circulation circuit 9 when the feed water pressure drop detecting means 57 described above detects a feed water pressure drop, when the heat pump control unit 35 receives a detection signal from the feed water pressure drop detecting means 57 in step S64. Since the target rotational speed of the circulation pump 30 is set to the minimum rotational speed before the freeze prevention operation in step S65, the freeze prevention operation of the circulation circuit 9 is required thereafter, and the operation of the circulation pump 30 is performed in the step S68. Even if it is started, cavitation is not generated, circulation failure in the circulation circuit 9 is not caused, and the circulation circuit 9 can be prevented from freezing. Further, the circulation pump 30 is caused by cavitation of the circulation pump 30. What can prevent the noise, vibration and erosion, and shorten the life of the circulation pump 30 A.

  In addition, since the water supply pressure decrease detecting means 57 detects that the water supply pressure has decreased based on the water supply pressure detected by the water supply pressure sensor 56, it reliably detects the decrease in the water supply pressure with a simple configuration. Is something that can be done.

  The present invention is not limited to the fifth embodiment described above. In the fifth embodiment described above, the heat pump control unit 35 reduces the feed water pressure before the anti-freezing operation of the circulation circuit 9 is performed. When the detection signal from the detection means 57 is received, the target rotation speed of the circulation pump 30 is set to the minimum rotation speed in the step S65. However, before the freeze prevention operation is performed, the heat pump control is performed. When the part 35 has not received the detection signal from the feed water pressure drop detection means 57 and the heat pump control part 35 has received the detection signal from the feed water pressure drop detection means 57 during the anti-freezing operation, the operation of the circulation pump 30 is performed. May be stopped, the target rotational speed is corrected to the minimum rotational speed, the operation of the circulation pump 30 is started again, and the freeze prevention operation of the circulation circuit 9 may be restarted. By doing so, even if cavitation of the circulation pump 30 occurs, noise, vibration and erosion generated in the circulation pump 30 can be minimized, and the life of the circulation pump 30 can be prevented from being shortened. In addition, since the target rotational speed of the circulation pump 30 is corrected to the minimum rotational speed, cavitation does not occur even if the circulation pump 30 is subsequently operated, and the circulation failure in the circulation circuit 9 is prevented. The freezing of the circulation circuit 9 can be prevented without inviting.

  In step S64, when the heat pump control unit 35 receives the detection signal from the feed water pressure drop detecting means 57, the heat pump control unit 35 displays an error code indicating that the feed water pressure has dropped on the display unit 6 of the hot water remote controller 5. The user may be informed that an error has occurred by, for example, issuing an alarm sound from a speaker (not shown) of the hot water remote controller 5, so that the user cannot perform a boiling operation in a normal state. In addition, the compressor 25 and the circulation pump 30 may be operated until the error is cleared, and the boiling operation for heating the hot water in the hot water storage tank 2 may not be performed. As a result, noise, vibration and erosion generated in the circulation pump 30 due to cavitation of the circulation pump 30 can be prevented and the life of the circulation pump 30 can be shortened. Of the can be prevented in advance, but can also be used in a safe and secure state there is time to perform a boiling the next operation.

  The feed water pressure drop detecting means 57 detects a drop in feed water pressure based on the feed water pressure detected by the feed water pressure sensor 56, but the antifreeze faucet 22 connected to the feed water pipe 8 is opened. By detecting this, it may be detected that the water supply pressure has decreased.

  Moreover, although the heat pump control part 35 which is a control part has the feed water pressure fall detection means 57, the hot water storage control part 24 may have the feed water pressure fall detection means 57 by making the control part into the hot water storage control part 24. The hot water storage control unit 24 and the heat pump control unit 35 are combined into one control unit, and this control unit may include the feed water pressure drop detecting means 57. The hot water storage control unit 24 Alternatively, the water supply pressure drop detecting means 57 may be provided in the hot water storage tank unit 1 or in the heat pump unit 3 independently in a state where communication with the heat pump control unit 35 is possible.

Next, a sixth embodiment will be described. In this embodiment, the water supply pressure sensor 56 described in the fifth embodiment is provided in the second embodiment described above, and the cavitation of the second embodiment is described. Instead of the detection means 36 and the actual rotation speed detection means 37, the water supply pressure drop detection means 57 of the fifth embodiment is provided, and the other same parts are denoted by the same reference numerals and description thereof is omitted. Only the configuration and operation will be described.
Here, the value of the feed water pressure detected by the feed water pressure sensor 56 is sent to the heat pump control unit 35 side via the hot water storage control unit 24 and detected by the feed water pressure drop detecting means 57 of the heat pump control unit 35. Based on the detected value of the water supply pressure, the water supply pressure drop detecting means 57 determines that the detected value of the water supply pressure is equal to or lower than the set pressure value, for example, compared with the set pressure value of the pressure reducing valve 21. Then, a detection signal is output to the heat pump control unit 35 because the water supply pressure has decreased, and when the heat pump control unit 35 receives the detection signal from the water supply pressure decrease detection means 57, the opening degree of the flow regulating valve 39 is opened to a predetermined level. Set in degrees.

  Next, the freeze prevention operation of the circulation circuit 9 when the feed water pressure drop detecting means 57 detects the feed water pressure drop will be described with reference to the flowchart shown in FIG. Based on the value of the feed water pressure detected in Step 1, when compared with, for example, a set pressure value of the pressure reducing valve 21 (for example, 170 kPa), when it is determined that the value of the feed water pressure is equal to or less than the set pressure value, the feed water pressure is decreased. As a detection signal to the heat pump control unit 35. The heat pump control unit 35 determines whether or not there is a detection signal from the feed water pressure drop detection means 57 (step S70). When the detection signal from the feed water pressure drop detecting means 57 is received in step S70, the opening of the flow rate adjustment valve 39 is set to the maximum opening so as to open from the closed state (step S71), If it is determined in step S70 that the detection signal from the feed water pressure drop detection means 57 has not been received, the heat pump control unit 35 closes the flow rate adjustment valve 39 (step S72), and then the outside air temperature sensor 32 detects. It is determined whether or not the outside air temperature is equal to or lower than a predetermined temperature (step S73).

  In step S73, when the heat-pump control unit 35 determines that the outside air temperature detected by the outside air temperature sensor 32 is equal to or lower than a predetermined temperature, the circulation is performed with the opening of the flow rate adjustment valve 39 set in step S71 or step S72. The operation of the circulation pump 30 is started so as to operate the pump 30 at the target rotational speed (step S74), the freeze prevention operation of the circulation circuit 9 is started, and whether or not the freeze prevention of the circulation circuit 9 is completed is determined. Judgment is made (step S75). For example, it is judged that the preset temperature has elapsed and the temperature of the hot water detected by the heat exchange inlet temperature sensor 33 has become equal to or higher than the predetermined temperature and the freezing prevention of the circulation circuit 9 has been completed. For example, the operation of the circulation pump 30 is stopped and the freeze prevention operation of the circulation circuit 9 is ended.

  In the freeze prevention operation of the circulation circuit 9 when the feed water pressure drop detecting means 57 described above detects the feed water pressure drop, the heat pump control unit 35 receives a detection signal from the feed water pressure drop detecting means 57 in step S70. In step S71, since the opening degree of the flow rate adjustment valve 39 is set to the maximum opening degree before the antifreezing operation, the antifreezing operation of the circulation circuit 9 is necessary in a state in which a decrease in the feed water pressure is detected thereafter. Even if the operation of the circulation pump 30 is started in step S74, cavitation does not occur, circulation failure in the circulation circuit 9 is not caused, and freezing of the circulation circuit 9 can be prevented. Prevents noise, vibration and erosion generated in the circulation pump 30 due to cavitation, and prevents the circulation pump 30 from shortening its life. It is those that can Rukoto.

  In addition, since the water supply pressure decrease detecting means 57 detects that the water supply pressure has decreased based on the water supply pressure detected by the water supply pressure sensor 56, it reliably detects the decrease in the water supply pressure with a simple configuration. Is something that can be done.

  Note that the present invention is not limited to the sixth embodiment described above. In the sixth embodiment described above, the heat pump control unit 35 reduces the feed water pressure before the freeze prevention operation of the circulation circuit 9 is performed. When the detection signal from the detection means 57 is received, the opening degree of the flow rate adjustment valve 39 is set to the maximum opening degree in the step S71. However, before the anti-freezing operation is performed, the heat pump control unit 35 is set. However, when the heat pump control unit 35 receives the detection signal from the feed water pressure drop detection means 57 during the freeze prevention operation, the operation of the circulation pump 30 is stopped. Then, the opening degree of the flow rate adjustment valve 39 may be adjusted to the maximum opening degree, and the operation of the circulation pump 30 may be started again to restart the freeze prevention operation of the circulation circuit 9. By doing so, even if cavitation of the circulation pump 30 occurs, noise, vibration and erosion generated in the circulation pump 30 can be minimized, and the life of the circulation pump 30 can be prevented from being shortened. Further, since the opening degree of the flow rate adjusting valve 39 is adjusted to the maximum opening degree, cavitation does not occur even if the circulation pump 30 is operated thereafter, and the circulation failure in the circulation circuit 9 is prevented. The freezing of the circulation circuit 9 can be prevented without inviting.

Next, a seventh embodiment of the present invention will be described. In this embodiment, the water supply pressure sensor 56 described in the fifth embodiment is provided in the third embodiment described above, and the third embodiment is described. Instead of the heating pump cavitation detecting means 52 and the heating pump actual rotation speed detecting means 53 of the embodiment, the water supply pressure drop detecting means 57 of the fifth embodiment is provided in the heating control unit 51, and the other identical parts are as follows. Only different configurations and operations will be described with the same reference numerals assigned and the description omitted.
Here, the value of the feed water pressure detected by the feed water pressure sensor 56 is detected by the feed water pressure drop detecting means 57 of the heating control unit 51, and the feed water pressure drop detecting means 57 detects the detected feed water pressure. If the value is compared with, for example, a set pressure value of the pressure reducing valve 21 (for example, 170 kPa) and the detected feed water pressure value is determined to be equal to or less than the set pressure value, the heating control unit 51 detects that the feed water pressure has decreased. When the signal is output and the heating control unit 51 receives the detection signal from the feed water pressure drop detecting means 57, the target rotation number of the primary side circulation pump 43 is set to a predetermined rotation number. The drop in the water supply pressure occurs when the water supply is cut off or the antifreeze water tap 22 is opened in the winter and the water in the water supply pipe 8 is drained upstream of the pressure reducing valve 21.

  Next, the heating operation when the feed water pressure drop detecting unit 57 detects the feed water pressure drop will be described with reference to the flowchart shown in FIG. 24. The feed water pressure drop detecting unit 57 detects the feed water pressure detected by the feed water pressure sensor 56. Based on the value of the water pressure, for example, when compared with a set pressure value of the pressure reducing valve 21 (for example, 170 kPa), if it is determined that the value of the feed water pressure is equal to or less than the set pressure value, The heating control unit 51 determines whether or not there is a detection signal from the feed water pressure drop detection means 57 (step S76), and the heating control unit 51 determines whether the feed water pressure is at step S76. When receiving the detection signal from the lowering detection means 57, the target rotational speed of the primary side circulation pump 43 is set in advance to the minimum rotational speed (for example, 300 rpm) (step S77). If it is determined in step S76 that the detection signal from the feed water pressure drop detection means 57 has not been received, the heating control unit 51 sets the target rotational speed of the primary circulation pump 43 to the rotational speed normally used in the heating operation (for example, 3500 rpm). (Step S78), and then the heating control unit 51 determines whether or not there is a heating operation start instruction signal from the heating operation instruction means 50 (step S79).

  In step S79, when the heating control unit 51 receives an instruction signal for starting the heating operation from the heating operation instruction means 50, the heating control unit 51 of the primary circulation pump 43 is operated so as to operate at the target rotational speed set in step S77 or step S78. The operation is started (step S80), and the operation of the secondary circulation pump 46 is started to start the heating operation. Then, the heating control unit 51 determines whether there is a heating operation stop instruction signal in the heating operation instruction unit 50 (step S81), and the heating control unit 51 instructs the heating operation stop unit 50 from the heating operation instruction unit 50. When the signal is received, the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 is stopped and the heating operation is ended.

  In the heating operation when the feed water pressure drop detecting means 57 described above detects the feed water pressure drop, when the heating control unit 51 receives the detection signal from the feed water pressure drop detecting means 57 in step S76, the heating operation is executed in step S77. Since the target rotational speed of the primary circulation pump 43 is set to the minimum rotational speed before starting the heating, there is an instruction to start the heating operation in a state where the feed water pressure is lowered, and then the primary circulation is performed in the step S80. Even if the operation of the pump 43 is started, cavitation does not occur, the circulation failure in the primary side circulation circuit 42 is not caused, the minimum heating of the room can be performed, and the room is not heated. In addition, noise, vibration and erosion generated in the primary circulation pump 43 due to cavitation of the primary circulation pump 43 are prevented in advance. In which it is possible to prevent from shrinking the life of the primary side circulation pump 43 with.

  In addition, since the water supply pressure decrease detecting means 57 detects that the water supply pressure has decreased based on the water supply pressure detected by the water supply pressure sensor 56, it reliably detects the decrease in the water supply pressure with a simple configuration. Is something that can be done.

  In addition, this invention is not limited to said 7th Embodiment, In said 7th Embodiment, the said heating operation when the feed water pressure fall detection means 57 detected feed water pressure fall was demonstrated. However, the step S79 and the step S81 are replaced with the step of determining the start of the freeze prevention of the primary circulation circuit 42 and the completion of the freeze prevention of the primary circulation circuit 42, and the feed water pressure drop detecting means 57 reduces the feed water pressure. The freezing prevention operation of the primary side circulation circuit 42 when detected may be described, and by doing so, the freezing prevention operation of the primary side circulation circuit 42 in the state where the feed water pressure is lowered causes the above-described step 80 to be performed. Even if the operation of the primary side circulation pump 43 is started, the primary side circulation circuit 42 can be prevented from freezing without causing a circulation failure in the primary side circulation circuit 42. Furthermore, it is possible to prevent noise, vibration and erosion generated in the primary side circulation pump 43 due to cavitation of the primary side circulation pump 43 and to prevent the life of the primary side circulation pump 43 from being shortened. It can be done.

  When the heating control unit 51 receives a detection signal from the feed water pressure drop detecting means 57 before the heating operation is performed, the target rotational speed of the primary side circulation pump 43 is set to the minimum rotational speed in step S77. However, before the heating operation is performed, the heating control unit 51 does not receive the detection signal from the feed water pressure drop detecting means 57, and the heating control unit 51 does not receive the feed water pressure during the heating operation. When receiving the detection signal from the lowering detection means 57, the operation of the primary side circulation pump 43 is stopped, the target rotation number of the primary side circulation pump 43 is corrected to the minimum rotation number, and the operation of the primary side circulation pump 43 is performed again. The heating operation may be resumed by starting. By doing so, even if cavitation of the primary circulation pump 43 occurs, noise, vibration and erosion generated in the primary circulation pump 43 can be minimized, and the life of the primary circulation pump 43 is shortened. Further, since the target rotational speed of the primary circulation pump 43 is set to the minimum rotational speed, cavitation does not occur even if the primary circulation pump 43 is operated thereafter. The minimum indoor heating can be performed without causing poor circulation in the primary side circulation circuit 42, and the room is not left in an unheated state.

  The feed water pressure drop detecting means 57 detects a drop in feed water pressure based on the feed water pressure detected by the feed water pressure sensor 56, but the antifreeze faucet 22 connected to the feed water pipe 8 is opened. By detecting this, it may be detected that the water supply pressure has decreased.

Next, an eighth embodiment of the present invention will be described. In this embodiment, the heating pump bypass pipe 54 and the heating flow rate adjusting valve 55 described in the fourth embodiment are added to the seventh embodiment described above. Other components that are the same are provided with the same reference numerals and description thereof is omitted, and only different configurations and operations will be described.
Here, the value of the feed water pressure detected by the feed water pressure sensor 56 is detected by the feed water pressure drop detecting means 57 of the heating control unit 51, and the feed water pressure drop detecting means 57 detects the detected feed water pressure. If the value is compared with, for example, the set pressure value of the pressure reducing valve 21 and the detected feed water pressure value is determined to be equal to or less than the set pressure value, a detection signal is output to the heating control unit 51 as the feed water pressure has decreased. When the heating control unit 51 receives the detection signal from the feed water pressure drop detecting means 57, the opening degree of the heating flow rate adjusting valve 55 is set to a predetermined opening degree.

  Next, the heating operation when the feed water pressure drop detecting unit 57 detects the feed water pressure drop will be described with reference to the flowchart shown in FIG. 27. The feed water pressure drop detecting unit 57 detects the feed water pressure detected by the feed water pressure sensor 56. Based on the water pressure value, for example, when compared with the set pressure value of the pressure reducing valve 21, if it is determined that the feed water pressure value is equal to or less than the set pressure value, a detection signal is output to the heating control unit 51 as the feed water pressure has decreased. The heating control unit 51 determines whether or not there is a detection signal from the feed water pressure drop detection unit 57 (step S82), and the heating control unit 51 detects the feed water pressure drop detection unit 57 in step S82. When the detection signal is received, the opening degree of the heating flow rate adjustment valve 55 is opened from the closed state to the maximum opening degree (step S83). If it is determined that the detection signal is not received, the heating control unit 51 closes the heating flow rate adjusting valve 55 (step S84), and then the heating control unit 51 instructs the heating operation instruction means 50 to start the heating operation. It is determined whether or not there is a signal (step S85).

  In step S85, when the heating control unit 51 receives an instruction signal for starting the heating operation from the heating operation instruction means 50, the opening of the heating flow rate adjustment valve 55 set in step S83 or step S84 is maintained in the primary side circulation. The primary side circulation pump 43 is started to operate so as to operate the pump 43 at a set target rotation speed (for example, 3500 rpm) (step S86), and the secondary side circulation pump 46 is started to start heating operation. Is. Then, the heating control unit 51 determines whether there is a heating operation stop instruction signal in the heating operation instruction unit 50 (step S87), and the heating control unit 51 instructs the heating operation stop unit 50 from the heating operation instruction unit 50. When the signal is received, the operation of the primary side circulation pump 43 and the secondary side circulation pump 46 is stopped and the heating operation is ended.

  In the heating operation when the feed water pressure drop detecting means 57 described above detects the feed water pressure drop, when the heating control unit 51 receives the detection signal from the feed water pressure drop detecting means 57 in step S82, the heating operation is executed in step S83. Since the opening degree of the heating flow rate adjustment valve 55 is set to the maximum opening degree before starting the operation, there is an instruction to start the heating operation in a state where the feed water pressure is lowered, and the primary side circulation pump 43 is activated in the step S86. Even if it is started, cavitation does not occur, circulation failure in the primary side circulation circuit 42 is not caused, minimum heating of the room can be performed, and the room is not left in an unheated state Furthermore, noise, vibration and erosion generated in the primary side circulation pump 43 due to the cavitation of the primary side circulation pump 43 are prevented and the primary side circulation. The that shrinking the life of the pump 43 in which it is possible to prevent.

  In addition, since the water supply pressure decrease detecting means 57 detects that the water supply pressure has decreased based on the water supply pressure detected by the water supply pressure sensor 56, it reliably detects the decrease in the water supply pressure with a simple configuration. Is something that can be done.

  In addition, this invention is not limited to said 8th Embodiment, In said 8th Embodiment, the said heating operation when the feed water pressure fall detection means 57 detected feed water pressure fall was demonstrated. However, the step S82 and the step S85 are replaced with the steps of determining whether the primary side circulation circuit 42 starts freezing prevention and the completion of the primary side circulation circuit 42 freezing prevention, and the feed water pressure drop detecting means 57 reduces the feed water pressure. The freezing prevention operation of the primary side circulation circuit 42 in the case of detection may be described, and by doing so, the freezing prevention operation of the primary side circulation circuit 42 in the state where the feed water pressure is reduced, the step 86 Even if the operation of the primary side circulation pump 43 is started, the primary side circulation circuit 42 can be prevented from freezing without causing a circulation failure in the primary side circulation circuit 42. Furthermore, it is possible to prevent noise, vibration and erosion generated in the primary side circulation pump 43 due to cavitation of the primary side circulation pump 43 and to prevent the life of the primary side circulation pump 43 from being shortened. It can be done.

  When the heating control unit 51 receives a detection signal from the feed water pressure drop detecting means 57 before the heating operation is performed, the opening degree of the heating flow rate adjustment valve 55 is set to the maximum opening degree in step S83. However, before the heating operation is performed, the heating control unit 51 does not receive the detection signal from the feed water pressure drop detection unit 57, and the heating control unit 51 performs the feed water pressure drop detection unit 57 during the heating operation. When the detection signal is received, the operation of the primary circulation pump 43 is stopped, the opening of the heating flow rate adjustment valve 55 is adjusted to the maximum opening, and the operation of the primary circulation pump 43 is started again to perform the heating operation. May be resumed. By doing so, even if cavitation of the primary circulation pump 43 occurs, noise, vibration and erosion generated in the primary circulation pump 43 can be minimized, and the life of the primary circulation pump 43 is shortened. Further, since the opening degree of the heating flow rate adjustment valve 55 is adjusted to the maximum opening degree, cavitation does not occur even if the primary side circulation pump 43 is subsequently operated. The minimum indoor heating can be performed without causing poor circulation in the primary side circulation circuit 42, and the room is not left in an unheated state.

1 is a schematic configuration diagram of a first embodiment of the present invention. The principal part block diagram of the 1st Embodiment. The flowchart which shows the action | operation when the cavitation of a circulation pump generate | occur | produces during the freezing prevention operation | movement of the said 1st Embodiment. The flowchart which shows the action | operation when the cavitation of a circulation pump generate | occur | produces during the boiling operation of the said 1st Embodiment. The schematic block diagram of 2nd Embodiment of this invention. The principal part block diagram of the 2nd Embodiment. The flowchart which shows the action | operation when the cavitation of a circulation pump generate | occur | produces during the freezing prevention operation | movement of the said 2nd Embodiment. The schematic block diagram of the 3rd Embodiment of this invention. The principal part block diagram of the 3rd Embodiment. The flowchart which shows the action | operation when the cavitation of a primary side circulation pump generate | occur | produces during the freezing prevention operation | movement of the said 3rd Embodiment. The flowchart which shows the action | operation when the cavitation of a primary side circulation pump generate | occur | produces during the heating operation of the said 3rd Embodiment. The schematic block diagram of the 4th Embodiment of this invention. The principal part block diagram of the 4th Embodiment. The flowchart which shows the action | operation when the cavitation of a primary side circulation pump generate | occur | produces during the freeze prevention operation | movement of the 4th Embodiment. The flowchart which shows the action | operation when the cavitation of a primary side circulation pump generate | occur | produces during the heating operation of the said 4th Embodiment. The schematic block diagram of 5th Embodiment of this invention. The principal part block diagram of the 5th Embodiment. The flowchart which shows the freeze prevention operation | movement of a circulation circuit when the feed water pressure fall detection means of the said 5th Embodiment detects feed water pressure fall. The schematic block diagram of the 6th Embodiment of this invention. The principal part block diagram of the 6th Embodiment. The flowchart which shows the freeze prevention operation | movement of a circulation circuit when the feed water pressure fall detection means of the said 6th Embodiment detects feed water pressure fall. The schematic block diagram of 7th Embodiment of this invention. The principal part block diagram of the 7th Embodiment. The flowchart which shows the heating operation when the feed water pressure fall detection means of the said 7th Embodiment detects a feed water pressure fall. The schematic block diagram of 8th Embodiment of this invention. The principal part block diagram of the 8th Embodiment. The flowchart which shows the heating operation when the feed water pressure fall detection means of the said 8th Embodiment detects a feed water pressure fall. The schematic block diagram of a prior art example.

Explanation of symbols

2 Hot water storage tank 3 Heating means (heat pump unit)
8 Water supply pipe 9 Circulation circuit 30 Circulation pump 35 Control unit 36 Cavitation detection means 37 Actual rotation speed detection means 38 Pump bypass pipe 39 Flow rate adjusting valve 40 Heat exchanger 41 for heating Heating terminal 42 Primary side circulation circuit 43 Primary side circulation pump 45 Secondary side circulation circuit 46 Secondary side circulation pump 51 Heating control unit 52 Heating pump cavitation detection means 53 Heating pump actual rotation speed detection means 54 Heating pump bypass pipe 55 Heating flow rate adjustment valve 56 Water supply pressure sensor 57 Water supply pressure drop detection means

Claims (22)

  A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply apparatus, cavitation detection means for detecting that cavitation of the circulation pump has occurred during operation of the circulation pump is provided, and the control unit stops the circulation pump when receiving a detection signal from the cavitation detection means And the target rotational speed is corrected to a lower rotational speed than before and the circulation pump is operated. Hot water storage type water heater.   The control unit, when receiving a detection signal from the cavitation detection means, stops the circulation pump, corrects the target rotation number to a minimum rotation number, and drives the circulation pump. Item 2. A hot water storage type hot water supply apparatus according to item 1.   A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply apparatus, cavitation detection means for detecting the occurrence of cavitation of the circulation pump at the time of operation of the circulation pump is provided, and the control unit operates the heating means and the circulation pump to boil hot water in the hot water storage tank. When a detection signal is received from the cavitation detection means during the boiling operation, the boiling operation is stopped and an error is detected. Perform knowledge, storage type hot water supply apparatus is characterized in that so as not to perform the boiling operation until said said error is canceled.   A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply apparatus, a pump bypass pipe having a flow rate adjusting valve is provided in the middle of connecting the discharge side and the suction side of the circulation pump, and the cavitation of the circulation pump is detected when the circulation pump is operated. Cavitation detection means is provided, and when the control unit receives a detection signal from the cavitation detection means, the control unit stops the circulation pump, By adjusting the amount adjustment valve to a predetermined opening degree, storage type hot water supply apparatus is characterized in that so as to actuate the circulation pump.   The control unit, when receiving a detection signal from the cavitation detection means, stops the circulation pump and adjusts the flow rate adjustment valve to a maximum opening degree to operate the circulation pump. Item 5. A hot water storage type hot water supply apparatus according to Item 4.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 5, further comprising an actual rotation speed detecting means for detecting an actual rotation speed when the circulating pump is operated, wherein the cavitation detection means is the actual rotation speed detection means. A hot water storage type hot water supply apparatus that detects that cavitation of the circulation pump has occurred based on the actual number of revolutions of the circulation pump detected by the system.   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, primary side circulation circuit for circulatingly connecting the hot water storage tank and the heating heat exchanger, a primary side circulation pump provided in the primary side circulation circuit, and a target of the primary side circulation pump In the hot water storage type hot water supply / heater device having a heating control unit that sets the rotation speed and controls the primary circulation pump to operate at the target rotation speed, cavitation of the primary circulation pump occurs when the primary circulation pump operates Heating pump cavitation detection means is provided for detecting that the heating control section receives the detection signal from the heating pump cavitation detection means, and the primary side circulation The pump was stopped, hot water storage type hot-water supply heating apparatus is characterized in that so as to actuate the primary side circulation pump is corrected to a lower rotational speed than before the target rotational speed.   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, a primary circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary circulation pump provided in the primary circulation circuit, the heating terminal, and the heating A secondary side circulation circuit for connecting the heat exchanger in a circulating manner, a secondary side circulation pump provided in the secondary side circulation circuit, and setting a target rotational speed of the primary side circulation pump to set the primary side circulation pump In the hot water storage type hot water supply / heater apparatus including a heating control unit that controls the motor to operate at a target rotational speed, a heating pump cavitation that detects that cavitation of the primary side circulation pump has occurred during operation of the primary side circulation pump The heating control unit operates the primary side circulation pump and the secondary side circulation pump, exchanges heat with the heating heat exchanger, and heats the room with the heating terminal. Upon receiving a detection signal from the pump cavitation detection means, an error is notified and the primary circulation pump is stopped, and the primary circulation pump is operated by correcting the target rotation speed to a lower rotation speed than before. A hot water storage type hot water supply and heating device characterized in that the hot water storage type hot water heater is used.   When the heating control unit receives the detection signal from the heating pump cavitation detection unit, the heating control unit stops the primary side circulation pump, corrects the target rotation number to the minimum rotation number, and operates the primary side circulation pump. The hot water storage type hot water supply and heating apparatus according to claim 7 or 8, wherein   Upon receiving the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary-side circulation pump and corrects the target rotational speed to a rotational speed that is lower by a predetermined rotational speed than before. When the circulating pump is operated and the detection signal from the heating pump cavitation detecting means is received thereafter, the primary circulating pump is stopped and the target rotational speed is corrected to a rotational speed lower than the predetermined rotational speed. 9. The hot water storage type hot water supply and heating apparatus according to claim 8, wherein the control for operating the primary side circulation pump is repeatedly performed until no detection signal is received from the heating pump cavitation detection means.   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, primary side circulation circuit for circulatingly connecting the hot water storage tank and the heating heat exchanger, a primary side circulation pump provided in the primary side circulation circuit, and a target of the primary side circulation pump In a hot water storage type hot water supply and heating device comprising a heating control unit that sets a rotation speed and controls the primary side circulation pump to operate at a target rotation speed, the discharge side and the suction side of the primary side circulation pump are connected in the middle A heating pump cavitation detection is provided for detecting the occurrence of cavitation of the primary circulation pump during operation of the primary circulation pump while providing a heating pump bypass pipe having a heating flow rate adjusting valve. And when the heating control unit receives a detection signal from the heating pump cavitation detection unit, the heating control unit stops the primary side circulation pump and adjusts the heating flow rate adjustment valve to a predetermined opening degree to adjust the primary side. A hot water storage type hot water supply and heating device characterized by operating a circulation pump.   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, a primary circulation circuit that connects the hot water storage tank and the heating heat exchanger in a circulating manner, a primary circulation pump provided in the primary circulation circuit, the heating terminal, and the heating A secondary side circulation circuit for connecting the heat exchanger in a circulating manner, a secondary side circulation pump provided in the secondary side circulation circuit, and setting a target rotational speed of the primary side circulation pump to set the primary side circulation pump In the hot water storage type hot water supply and heating device provided with a heating control unit that controls the motor to operate at a target rotational speed, a heating pump having a heating flow rate adjusting valve in the middle by connecting the discharge side and the suction side of the primary side circulation pump While providing a bypass pipe, A heating pump cavitation detecting means for detecting the occurrence of cavitation of the primary side circulation pump during operation of the primary side circulation pump is provided, and the heating control unit operates the primary side circulation pump and the secondary side circulation pump, and When a detection signal is received from the heating pump cavitation detection means during a heating operation in which heat is exchanged by a heating heat exchanger and the room is heated by the heating terminal, an error is notified and the primary circulation pump is stopped. The hot water storage type hot water heater is characterized in that the primary circulation pump is operated by adjusting the heating flow rate adjusting valve to a predetermined opening degree.   When the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump, adjusts the heating flow rate adjustment valve to the maximum opening, and operates the primary side circulation pump. The hot water storage type hot water supply and heating device according to claim 11 or 12, wherein   When the heating control unit receives the detection signal from the heating pump cavitation detection means, the heating control unit stops the primary side circulation pump, adjusts the heating flow rate adjustment valve to the maximum opening, and operates the primary side circulation pump. The hot water storage system according to claim 12, wherein the opening degree of the heating flow rate adjusting valve is gradually decreased thereafter, and the opening degree is adjusted so as not to cause cavitation of the primary circulation pump. Hot water heater.   The hot water storage hot water supply / heating device according to any one of claims 7 to 14, further comprising a heating pump actual rotation number detecting means for detecting an actual rotation number when the primary-side circulation pump is operated, wherein the heating pump cavitation detecting means includes: A hot water storage type hot water supply / room heating device, wherein the occurrence of cavitation of the primary side circulation pump is detected based on the actual number of rotations of the primary side circulation pump detected by the heating pump actual rotation number detection means.   A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply apparatus, provided is a supply water pressure decrease detecting means for detecting that the supply water pressure has decreased, and the control unit receives the detection signal from the supply water pressure decrease detection means to minimize the target rotational speed of the circulation pump. A hot water storage type hot water supply apparatus characterized in that the rotational speed is set.   A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply apparatus, provided is a water supply pressure drop detecting means for detecting that the water supply pressure has dropped, and when the control unit receives a detection signal from the water supply pressure drop detecting means, the controller notifies the error and the heating means And a hot water storage type hot water supply apparatus that does not perform a boiling operation of boiling hot water in a hot water storage tank by operating a circulation pump until the error is canceled.   A hot water storage tank for storing hot water, a heating means for heating the hot water in the hot water storage tank, a circulation circuit for connecting the hot water storage tank and the heating means in a circulatorable manner, and a circulation pump provided in the circulation circuit; A hot water storage type comprising a water supply pipe for supplying water to the hot water storage tank, and a control unit for controlling the operation of the heating means and setting the target rotational speed of the circulation pump to control the circulation pump to operate at the target rotational speed. In the hot water supply device, the discharge side and the suction side of the circulation pump are connected, a pump bypass pipe having a flow rate adjusting valve is provided in the middle, and a supply water pressure decrease detecting means for detecting that the supply water pressure has decreased is provided, When the control unit receives the detection signal from the water supply pressure drop detecting means, the flow rate adjusting valve is set to a maximum opening degree.   19. The water supply pressure drop detecting means detects that the water supply pressure has dropped based on a water supply pressure detected by a water supply pressure sensor provided in the water supply pipe. The hot water storage type hot water supply apparatus according to any one of the above.   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, primary side circulation circuit for circulatingly connecting the hot water storage tank and the heating heat exchanger, a primary side circulation pump provided in the primary side circulation circuit, and a target of the primary side circulation pump In the hot water storage hot water supply and heating apparatus provided with a heating control unit that sets the number of rotations and controls the primary side circulation pump to operate at the target number of rotations, a water supply pressure decrease detection unit that detects a decrease in the water supply pressure is provided, When the heating control unit receives a detection signal from the feed water pressure drop detecting means, the target rotation speed of the primary side circulation pump is set to the minimum rotation speed, and the hot water storage type hot water supply and heating apparatus is characterized in that .   A hot water storage tank for storing hot water, heating means for heating the hot water in the hot water storage tank, a water supply pipe for supplying water to the hot water storage tank, heating for exchanging heat between the hot water in the hot water storage tank and the heating medium on the heating terminal side Heat exchanger, primary side circulation circuit for circulatingly connecting the hot water storage tank and the heating heat exchanger, a primary side circulation pump provided in the primary side circulation circuit, and a target of the primary side circulation pump In a hot water storage type hot water supply and heating device comprising a heating control unit that sets a rotation speed and controls the primary side circulation pump to operate at a target rotation speed, the discharge side and the suction side of the primary side circulation pump are connected in the middle A heating pump bypass pipe having a heating flow rate adjusting valve is provided, and a feed water pressure drop detecting means for detecting that the feed water pressure has dropped is provided, and the heating control unit receives a detection signal from the feed water pressure drop detecting means. When Hot water storage type hot-water supply heating apparatus is characterized in that so as to maximize the opening of the heating flow control valve.   The said water supply pressure fall detection means detects that the water supply pressure fell based on the water supply pressure which the water supply pressure sensor provided in the said water supply pipe | tube detects. 22 or 21 characterized by the above-mentioned. The hot water storage type hot water supply / heating device described.

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