JP6410110B2 - Circulation pump unit, hot water supply system, and control method of circulation pump unit - Google Patents

Description

  The present invention provides a circulating pump unit in which a connecting pipe from a hot water supply forward flow path and a hot water supply heat source is connected to an internal flow path on the discharge port side, and a hot water supply return flow path is connected to an internal flow path on the suction port side The present invention relates to a hot water supply system and a control method for a circulation pump unit.

  Conventionally, as this type of hot water supply system (hot water supply piping system), a hot water supply serving as a hot water supply source, a hot water supply main pipe and a hot water return main pipe extending from the water heater, and a hot water supply main pipe and a hot water return main pipe via a base side T-shaped joint A hot water supply main pipe connected to the hot water supply pipe, a plurality of hot water supply branch pipes connected to the hot water supply main pipe via branch side T-shaped joints, and a terminal side hot water supply pipe provided at a connection portion between each hot water supply branch pipe and each hot water supply terminal The thing provided with the coupling is known (refer to patent documents 1). Each of the hot water supply main pipe and the plurality of hot water supply branch pipes is composed of a hot water supply double pipe including an inner pipe having a flow path therein and an outer pipe having a flow path in the gap between the inner pipe and the inner pipe. . That is, in this hot water supply system, the hot water supply going from the water heater to the terminal side hot water pipe fitting and the hot water supply from the terminal side hot water pipe fitting to the water heater by the hot water supply main pipe, the hot water return main pipe, the hot water supply main pipe and the plurality of hot water branch pipes. And a circulation flow path (closed loop) composed of a hot water supply forward path and a hot water supply return path. In this hot water supply system, the hot water in the circulation channel is maintained at a predetermined temperature by circulating the hot water in the circulation channel by a circulation pump (hot water circulation pump) built in the water heater.

Japanese Patent No. 4168315

  However, the conventional hot water supply system has a configuration in which the circulation pump is continuously driven without stopping the circulation pump even when the supply of hot water from the water heater is started by using the hot water. On the other hand, the amount of warm water in the circulation channel is small compared to the general amount of warm water used, and the warm water in the circulation channel flows completely by using warm water once. For this reason, there is no point in driving the circulation pump to maintain the warm water in the circulation channel at a predetermined temperature when the warm water is used. Therefore, in the conventional hot water supply system, the circulation pump is continuously driven unnecessarily, and there is a problem that power consumption increases accordingly.

  In view of the above problems, an object of the present invention is to provide a circulation pump unit, a hot water supply system, and a control method for the circulation pump unit that can suppress power consumption.

The circulation pump unit of the present invention has a hot water supply forward flow channel and a connecting pipe from a hot water supply heat source connected to the internal flow channel on the discharge port side, and a hot water supply return flow channel connected to the internal flow channel on the suction port side. A circulation pump unit provided in the internal flow path on the suction port side, a heating tank provided in the internal flow path on the discharge port side and incorporating a heater, and a connecting pipe on the discharge port side A connection flow path connected to the internal flow path, a flowing water detection unit provided in the connection flow path, an air vent valve provided upstream of the circulation pump in the internal flow path on the suction port side, and circulation A control unit that controls the pump and the heater, and the control unit stops the circulation pump when the flowing water detection unit detects the flowing water.

According to this configuration, since the driving of the circulation pump is stopped when the flowing water detection unit detects the flowing water, the driving of the circulation pump is started when the supply of hot water from the hot water supply source (use of hot water) is started. It can be forcibly stopped. Therefore, it is possible to avoid a situation where the circulation pump is continuously driven unnecessarily, and power consumption can be suppressed.
In addition, since the air vent valve is built in, the safety of the circulation pump unit and the hot water supply system incorporating the same can be improved.

  According to these configurations, when the flowing water detection unit detects flowing water, the driving of the circulation pump is stopped. Therefore, when the supply of hot water from the hot water supply source (use of hot water) is started, the driving of the circulation pump is performed. Can be forcibly stopped. Therefore, it is possible to avoid a situation where the circulation pump is continuously driven unnecessarily, and power consumption can be suppressed.

  In the above circulation pump unit, the control unit preferably stops the heater when the flowing water detection unit detects flowing water.

  According to this configuration, since the driving of the heater is stopped when the flowing water detection unit detects the flowing water, the driving of the heater can be forcibly stopped when the supply of hot water from the hot water supply heat source is started. it can. Therefore, it is possible to avoid a situation where the heater is continuously driven in vain and power consumption can be further suppressed.

  In this case, a temperature detection unit that detects the temperature of the hot water in the internal channel on the suction port side is further provided, and the control unit sets the mode to increase the temperature of the hot water in the hot water supply forward channel and the hot water return channel. It is configured to be switchable between a temperature mode and a non-temperature increase mode in which the temperature of the hot water in the hot water supply forward flow path and the hot water return flow path is not increased. In the temperature increase mode, the temperature detected by the temperature detection unit is a predetermined value. When the temperature rises below the temperature rise start temperature, the circulation pump and heater start to be driven, and when the temperature detected by the temperature detector exceeds the predetermined temperature rise end temperature, the circulation pump and heater are driven. It is preferable to stop.

  According to this configuration, the power consumption can be further suppressed by switching to the temperature raising mode only when the temperature rise of the hot water in the hot water supply forward flow path and the hot water supply return flow path is necessary.

  Moreover, it is preferable that a control part switches a mode to temperature rising mode, when the temperature rising start time set by the temperature rising start time setting part comes.

  According to this configuration, when the temperature increase start time set by the user is reached, the temperature increase mode is automatically switched to, for example, by setting the temperature increase start time a few minutes before the return time. When returning home, the hot water in the hot water supply forward flow path and the hot water supply return flow path can be kept in a temperature rise state (a state where the temperature has been raised to a constant temperature). That is, even if it is not always in the temperature raising mode, the hot water in the hot water supply forward flow path and the hot water supply return flow path can be kept in the temperature rising state at the required time. Therefore, it is possible to avoid the situation where the temperature raising mode is always set, and the power consumption can be further suppressed. Note that the user sets the hot water usage start time, and raises the temperature several minutes before the hot water usage start time (the time that goes back by the time until the temperature is raised to a certain temperature after switching to the heating mode). The structure which makes it start time may be sufficient.

  In this case, it is preferable that the temperature increase start time setting unit is configured by a remote controller.

  According to this configuration, the temperature rise start time can be easily set.

On the other hand, it is preferable to further include an overpressure relief valve interposed in the connection flow path.
According to this configuration, the safety of the circulation pump unit and the hot water supply system incorporating the same can be improved by incorporating the overpressure relief valve and the air vent valve.

A hot water supply system of the present invention includes the above circulating pump unit, a hot water supply heat source connected to the internal flow path on the discharge port side via a connecting pipe, a hot water supply forward flow path connected to the internal flow path on the discharge port side, And a hot water supply pipe having a hot water supply return flow path connected to the internal flow path on the inlet side.
According to this configuration, since the driving of the circulation pump is stopped when the flowing water detection unit detects the flowing water, the driving of the circulation pump is started when the supply of hot water from the hot water supply source (use of hot water) is started. It can be forcibly stopped. Therefore, it is possible to avoid a situation where the circulation pump is continuously driven unnecessarily, and power consumption can be suppressed.

  According to these configurations, the safety of the circulation pump unit and the hot water supply system incorporating the same can be improved by incorporating the overpressure relief valve and the air vent valve.

  In the hot water supply system described above, the hot water supply pipe has a hot water supply double pipe including an inner pipe in which a hot water supply forward flow path is formed and an outer pipe in which a hot water return flow path is formed in a gap between the inner pipe and the hot water supply pipe. It is preferable.

  According to this configuration, by using a hot water supply double pipe configured with a hot water supply forward flow path and a hot water supply return flow path, compared to a case where two forward and return hot water supply pipes are separately constructed, the pipe use The space can be narrowed, and the fixing points of the pipe and the heat insulating material of the pipe can be reduced. Furthermore, the warm water on the outgoing side passing through the inner side of the inner pipe can be kept warm by the warm water on the return side passing through the outer side of the inner pipe, and the temperature drop of the hot water supplied to the hot water supply terminal can be effectively prevented. .

It is a system diagram showing a hot water supply system according to an embodiment of the present invention. (A) is a sectional view showing a hot water supply main pipe and a hot water supply branch pipe, (b) is a sectional view showing a double pipe branch joint, and (c) shows a double pipe T-shaped joint. (D) is a sectional view showing a double pipe end joint. It is the schematic diagram which showed the internal structure of the circulation pump unit. It is the block diagram which showed the function structure of the control part which concerns on an immediate hot water function. It is the flowchart which showed the control action at the time of temperature rising mode in a circulation pump unit.

  Hereinafter, a control method for a circulation pump unit, a hot water supply system, and a circulation pump unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. The embodiment exemplifies a hot water supply system to which the circulation pump unit and the control method of the circulation pump unit of the present invention are applied. This hot water supply system supplies hot water to a plurality of hot water supply terminals in a first branching manner. In particular, this hot water supply system is a reverse-return hot water supply system, and the temperature of the hot water in the hot water supply forward flow path and the hot water supply return flow path is raised by a circulation pump unit to which the hot water supply forward flow path and the hot water supply return flow path are connected. By circulating as much as possible, the hot water in the hot water supply flow path and the hot water return flow path has a function of maintaining a constant temperature (immediate hot water function).

  As shown in FIG. 1, a hot water supply system SY includes a water heater 1 (hot water supply heat source) having a heat pump as an auxiliary heat source and an electric or gas hot water supply heat source as a main heat source, a circulation pump unit 2 attached to the water heater 1, and a hot water supply. And a hot water supply pipe 4 for connecting the circulating pump unit 2 and a plurality of hot water supply terminals A. The hot water supply system SY includes a remote controller 5 (temperature increase start time setting unit) that is connected to the circulation pump unit 2 and performs various settings and various operations of the hot water supply system SY.

  The plurality of hot water supply terminals A of the present embodiment are installed in a standard house, and are composed of a mixer tap for a bathroom vanity, a mixer tap for a bathroom, a mixer tap for a system kitchen, and the like. These mixing plugs (hot-water supply terminal A) are provided with a pair of hot water connecting pipes A1 (see FIG. 2 (d)) at the lower concealment portion.

  The hot water supply pipe 4 includes a hot water supply main pipe 11 having one end connected to the discharge port side of the circulation pump unit 2, a hot water return main pipe 12 having one end connected to the suction port side of the circulation pump unit 2, a hot water supply main pipe 11 and A double pipe branch joint 13 to which the other end of the hot water return main pipe 12 is connected, a hot water main pipe 14 to which one end is connected to the double pipe branch joint 13 and the other end is connected to the hot water supply terminal A 1, and a hot water main pipe 14 and a plurality of hot water branch pipes 16 having one end connected to each double pipe T joint 15 and the other end connected to each one hot water terminal A. And. In addition, double pipe terminal joints 17 are respectively provided at a connection portion between the hot water supply main pipe 14 and the hot water supply terminal A and a connection portion between the hot water supply branch pipe 16 and the hot water supply terminal A. Although details will be described later, in the hot water supply pipe 4, the hot water supply main pipe 14 and each hot water supply branch pipe 16 are constituted by a hot water supply double pipe, a hot water supply main pipe 11, a double pipe branch joint 13, a hot water supply main pipe 14, a plurality of The double pipe T-shaped joint 15 and each hot water supply branch pipe 16 constitute a hot water supply forward flow path from the circulation pump unit 2 to each double pipe terminal joint 17. Further, the hot water supply main pipe 12, the double pipe branch joint 13, the hot water main pipe 14, the plurality of double pipe T-shaped joints 15 and the respective hot water branch pipes 16 are connected to the circulation pump unit 2 from the respective double pipe terminal joints 17. A return flow path is configured.

  As shown to Fig.2 (a), the hot water supply main pipe 14 and each hot water supply branch pipe 16 are comprised with the hot water supply double pipe. The hot water supply double pipe constituting the hot water supply main pipe 14 and each hot water supply branch pipe 16 is composed of an inner pipe 21 and an outer pipe 22, and a hot water supply forward flow path is formed inside the inner pipe 21, and the outer pipe 22 and the inner pipe. A hot water supply return flow path is formed in the gap with 21. The hot water supply double pipe is constituted by a resin pipe, specifically, a polybutene pipe. That is, the inner pipe 21 and the outer pipe 22 that form a hot water supply double pipe are both constituted by polybutene pipes. In addition, it is preferable that the outer tube 22 be two sizes larger than the inner tube 21 in the nominal diameter.

  As shown in FIG. 2 (b), the double pipe branch joint 13 is a joint having a "T" shape as a whole, the hot water supply main pipe 11 is connected to the original side, and the hot water return main pipe 12 is connected to the branch side. Is connected, and a hot water supply main pipe 14 is connected to the front side. Specifically, the double-pipe branch joint 13 is formed on the original side, the forward pipe connection port 31 that connects the hot water supply main pipe 11, and the return pipe connection port that is formed on the branch side and connects the hot water supply return pipe 12. 32 and an inner tube connection port 33 and an outer tube connection port 34 that are formed on the front side and connect the inner tube 21 and the outer tube 22 of the hot water supply main tube 14.

  The outgoing pipe connection port 31 and the inner pipe connection port 33 communicate with each other. Thus, the double pipe branch joint 13 connects the hot water supply main pipe 11 and the flow path inside the inner pipe 21 of the hot water main pipe 14. On the other hand, the return pipe connection port 32 and the outer pipe connection port 34 communicate with each other. As a result, the double pipe branch joint 13 connects the hot water return main pipe 12 and the flow path in the gap between the inner pipe 21 and the outer pipe 22 of the hot water main pipe 14.

  As shown in FIG. 2 (c), the double pipe T-shaped joint 15 is a branch joint having a “T” shape as a whole, and the hot water supply double pipe constituting the hot water supply main pipe 14 on the former side and the front side. The pipes are connected in a straight line, and a hot water supply branch pipe 16 is connected to the branch side. Specifically, the double pipe T-shaped joint 15 is formed on the original side, and the first inner pipe connection port 41 and the first pipe connecting the inner pipe 21 and the outer pipe 22 of one hot water supply double pipe of the hot water supply main pipe 14. 1 outer pipe connection port 42, a second inner pipe connection port 43 and a second outer pipe connection port 44 that are formed on the front side and connect the inner pipe 21 and the outer pipe 22 of the other hot water supply double pipe of the hot water supply main pipe 14. And a third inner pipe connection port 45 and a third outer pipe connection port 46 that are formed on the branch side and connect the inner pipe 21 and the outer pipe 22 of the hot water supply branch pipe 16.

  The first inner pipe connection port 41, the second inner pipe connection port 43, and the third inner pipe connection port 45 communicate with each other. Thereby, the double pipe T-shaped joint 15 connects the flow paths inside the inner pipe 21 of the two hot water supply double pipes and the hot water supply branch pipe 16 constituting the hot water supply main pipe 14 to each other. On the other hand, the first outer tube connection port 42, the second outer tube connection port 44, and the third outer tube connection port 46 communicate with each other. Thereby, the double pipe T-shaped joint 15 connects the flow paths in the gap between the inner pipe 21 and the outer pipe 22 of the two hot water double pipes and the hot water branch pipes 16 constituting the hot water main pipe 14 to each other. doing.

  As shown in FIG. 2D, the double pipe terminal joint 17 has one end connected to the hot water supply main pipe 14 or the hot water branch pipe 16, and the other end connected to the appliance connecting pipe A1 of the hot water supply terminal A. Specifically, the double pipe terminal joint 17 is formed at one end, and an inner pipe connection port 51 and an outer pipe connection port 52 that connect the inner pipe 21 and the outer pipe 22 of the hot water supply main pipe 14 or the hot water supply branch pipe 16, And a terminal connection port 53 for connecting the instrument connection tube A1.

  The inner pipe connection port 51 and the terminal connection port 53 communicate with each other. Thereby, the double pipe end joint 17 connects the flow path (hot water supply forward flow path) inside the inner pipe 21 of the hot water supply main pipe 14 or the hot water supply branch pipe 16 and the instrument connecting pipe A1. On the other hand, the inner tube connection port 51 and the outer tube connection port 52 communicate with each other via a communication opening 51 a formed in the inner tube connection port 51. As a result, in the hot water supply main pipe 14 or the hot water supply branch pipe 16, the flow path inside the inner pipe 21 (hot water supply forward flow path) and the flow path (hot water return flow path) in the gap between the inner pipe 21 and the outer pipe 22 are connected. ing. Thereby, in the hot water supply pipe 4 as a whole, the downstream side of the hot water supply forward flow path and the upstream side of the hot water supply return flow path are connected. As a result, a circulation channel is formed through the circulation pump unit 2, which is composed of a hot water supply forward channel and a hot water supply return channel.

  Next, the circulation pump unit 2 will be described with reference to FIG. As shown in FIG. 3, the circulation pump unit 2 corresponds to both the electric and gas hot water supply heat sources, and includes a circulation pump 61 and a discharge-side internal channel 62 (connected to the discharge port side of the circulation pump 61 ( A discharge tank side internal flow path), a heating tank 64 containing a heater 63, and a suction side internal flow path 65 (suction) connected to the suction port side of the circulation pump 61. The internal flow path on the mouth side), the air vent valve 66, the temperature sensor 67 (temperature detection unit) and the first flow switch 68 provided in the suction side internal flow path 65, and the circulation pump 61 and the heater 63 are controlled. And a control unit 69. The discharge-side internal flow path 62 is connected to the hot water supply forward pipe 11 and is connected to the hot water supply forward flow path. On the other hand, the suction side internal flow path 65 is connected to the hot water supply return main pipe 12 and is connected to the hot water supply return flow path.

  The circulation pump unit 2 joins the discharge-side internal flow path 62 and is connected to the connection flow path 71 and the connection flow path 71 that connects the connection pipe 3 from the water heater 1 to the discharge-side internal flow path 62. A second flow switch 72 (running water detection unit) and an overpressure relief valve 73. The discharge-side internal flow path 62 is connected to the connection pipe 3 from the water heater 1 via the connection flow path 71, and is connected to the water heater 1 via the connection flow path 71 and the connection pipe 3.

  Further, check valves 75 and 76 for preventing a backflow from the joining portion are provided in front of the joining portion in the discharge-side internal passage 62 and the connection passage 71, respectively.

  Circulation pump 61 circulates hot water in circulation channels (hot water supply forward channel and hot water supply return channel) by driving. On the other hand, the heating tank 64 has a tank main body 81 for storing hot water and a heater 63 built in the tank main body 81, and the hot water stored in the tank main body 81 is heated by driving the heater 63. Raise the temperature. In the present embodiment, the heater 63 of the heating tank 64 is driven to raise the temperature of the hot water, and the circulation pump 61 is driven to circulate the hot water in the circulation flow path, so that the hot water in the circulation flow path is kept constant. It is configured to keep the temperature.

  The air vent valve 66 is interposed in the suction side internal flow path 65, performs air venting in the suction side internal flow path 65, and removes air in the circulation flow path.

  The temperature sensor 67 is interposed in the suction side internal flow path 65, detects the temperature of the hot water in the suction side internal flow path 65, and detects the temperature of the hot water in the circulation flow path. Although details will be described later, by controlling the driving of the circulation pump 61 and the heater 63 based on the detection result of the temperature sensor 67, the hot water in the circulation flow path is maintained at a constant temperature.

  The first flow switch 68 is interposed in the suction side internal flow path 65 and detects the flow of warm water in the circulation flow path by detecting the flow of warm water in the suction side internal flow path 65. The detection result of the first flow switch 68 is used to determine whether hot water is normally circulated in the circulation flow path when the circulation pump 61 is driven.

  The second flow switch 72 is interposed in the connection flow path 71 and detects flowing water from the water heater 1 to detect whether hot water is supplied from the water heater 1. Although details will be described later, the detection result of the second flow switch 72 is used to control the circulation pump 61 and the heater 63 to be stopped when the hot water from the water heater 1 is supplied.

  The overpressure relief valve 73 is interposed in the connection flow path 71 and automatically operates when the pressure in the connection flow path 71 becomes a certain value or more, and releases the pressure in the connection flow path 71.

  The control unit 69 is connected to the temperature sensor 67, the first flow switch 68 and the second flow switch 72, and is connected to the circulation pump 61 and the heater 63. The control unit 69 receives detection results of the temperature sensor 67, the first flow switch 68, and the second flow switch 72, and controls the circulation pump 61 and the heater 63. The control unit 69 is connected to the remote controller 5 and accepts various settings and various operations performed by the user on the remote controller 5. That is, the control unit 69 receives and accepts setting information and operation information transmitted from the remote controller 5 in response to a user operation.

  In the hot water supply system SY, when a user opens one of the hot water supply terminals A to use hot water, the hot water of the hot water heater 1 is supplied to the circulation pump unit 2 through the connection pipe 3 by the water head pressure. It is supplied to the hot water supply terminal A from the circulation pump unit 2 via the hot water supply forward flow path (the hot water supply forward pipe 11, the double pipe branch joint 13, the hot water main pipe 14, the double pipe T-shaped joint 15 and the hot water branch pipe 16). . Further, in the hot water supply system SY, under the control of the control unit 69, the circulating pump 61 and the heater 63 are driven to circulate while warming the hot water in the circulation flow path, so that the temperature of the hot water in the circulation flow path is increased. Can be maintained at a constant temperature (instant hot water function).

  Here, with reference to FIG. 4, the functional structure of the control part 69 which concerns on an immediate hot-water supply function is demonstrated. As shown in FIG. 4, the control unit 69 includes a mode switching unit 91, a pump control unit 92, and a heater control unit 93 as a functional configuration related to the immediate hot water function.

  The mode switching unit 91 changes the mode of the circulation pump unit 2 between a temperature rising mode in which warm water in the circulation channel is heated (kept warm) and a non-temperature increase mode in which the warm water in the circulation channel is not heated. Switch. Specifically, a mode switching operation at the remote controller 5 is accepted, and the mode of the circulation pump unit 2 is switched from the temperature increase mode to the non-temperature increase mode or from the non-temperature increase mode to the temperature increase mode accordingly. The mode switching means 91 receives the temperature rise start time set by the remote controller 5 and switches the mode from the non-temperature rise mode to the temperature rise mode when the temperature rise start time is reached (temperature rise reservation function). ).

  The pump control means 92 controls the driving of the circulation pump 61 based on the detection results of the temperature sensor 67, the first flow switch 68 and the second flow switch 72. Specifically, the pump control unit 92 starts driving the circulation pump 61 when the temperature detected by the temperature sensor 67 is equal to or lower than a predetermined temperature increase start temperature in the state where the temperature increase mode is switched to. When the temperature detected by the temperature sensor 67 is equal to or higher than the predetermined temperature rise end temperature, the circulation pump 61 is stopped. Thereby, in the temperature raising mode, the temperature of the hot water in the circulation flow path is maintained at the temperature rise start temperature or higher and the temperature rise end temperature or lower. In the state in which the pump control unit 92 is switched to the non-temperature increase mode, the pump control unit 92 starts to drive the circulation pump 61 even when the temperature detected by the temperature sensor 67 is equal to or lower than a predetermined temperature increase start temperature. Without maintaining the temperature of the hot water in the circulation channel.

  Further, the pump control unit 92 determines that the circulation flow path when the first flow switch 68 does not detect flowing water of a predetermined value or more (for example, 1.5 L / min) after a certain time has elapsed from the start of driving of the circulation pump 61. It is determined that the circulation of the hot water is not normally performed, and the driving of the circulation pump 61 is stopped.

  Further, the pump control means 92 performs control for stopping the circulation pump 61 when hot water is supplied from the water heater 1. Specifically, the pump control unit 92 forcibly stops driving the circulation pump 61 when the second flow switch 72 detects flowing water. Moreover, the pump control means 92 cancels the drive start of the circulation pump 61 at the said temperature rising mode in the state which the 2nd flow switch 72 detected flowing water.

  On the other hand, the heater control means 93 controls the driving of the heater 63 based on the detection results of the temperature sensor 67 and the second flow switch 72. Specifically, the heater control means 93, when the temperature detected by the temperature sensor 67 is equal to or lower than the predetermined temperature rise start temperature in the state of switching to the temperature rise mode, similarly to the drive control of the circulation pump 61. Then, the driving of the heater 63 is started, and the driving of the heater 63 is stopped when the temperature detected by the temperature sensor 67 becomes equal to or higher than a predetermined temperature rise end temperature. The heater control means 93 forcibly stops the driving of the heater 63 when the second flow switch 72 detects flowing water.

  Next, with reference to FIG. 5, the control operation in the temperature raising mode in the circulation pump unit 2 will be described. In this control operation, the mode of the circulation pump unit 2 is changed to the non-temperature increase mode by the mode switching means 91 in response to the mode switching operation by the remote controller 5 or the temperature rise start time set by the remote controller 5 is reached. This is executed when the mode is switched to the temperature raising mode.

  As shown in FIG. 5, the control unit 69 first determines the temperature of the temperature rise start temperature. That is, it is determined whether or not the temperature detected by the temperature sensor 67 is equal to or lower than a predetermined temperature increase start temperature (S1), and it is determined that the detected temperature is not equal to or lower than the predetermined temperature increase start temperature. In (S1: No), the determination is repeatedly executed at regular intervals until it is determined that the detected temperature is equal to or lower than the predetermined temperature increase start temperature.

  If it is determined by the temperature determination that the detected temperature is equal to or lower than the predetermined temperature rise start temperature (S1: Yes), it is determined whether or not the second flow switch 72 is in a state of detecting running water. (S2). When it is determined that the second flow switch 72 is not in a state of detecting flowing water (S2: No), the pump control means 92 starts driving the circulation pump 61 (S3). On the other hand, when it is determined that the second flow switch 72 is in a state where flowing water is detected (S2: Yes), the drive start of the circulation pump 61 is canceled, and the temperature determination of the temperature rise start temperature is returned (S1). . That is, when the flowing water from the water heater 1 is detected, the driving of the circulation pump 61 is not started, and the driving of the circulation pump 61 is started only when the flowing water from the water heater 1 is not detected.

  When the driving of the circulation pump 61 is started, it is determined whether or not the first flow switch 68 has detected a predetermined amount of running water after a predetermined time has elapsed (S4). When it is determined that the first flow switch 68 is not in a state of detecting a predetermined amount of running water (S4: No), it is determined that the hot water in the circulation passage is not normally circulated, and the pump control means The circulating pump 61 is stopped by 92 (S5), and this operation is finished. On the other hand, if it is determined that the first flow switch 68 has detected a predetermined amount of flowing water (S4: Yes), it is determined that the circulation of the hot water in the circulation channel is normally performed, The heater control means 93 starts driving the heater 63 (S6).

  When driving of the circulation pump 61 and the heater 63 is started, the running water judgment from the water heater 1 and the temperature judgment of the temperature rise end temperature are performed. That is, first, it is determined whether or not the second flow switch 72 is in a state of detecting flowing water (S7), and if it is determined that the second flow switch 72 is not in a state of detecting flowing water (S7: No), the temperature It is determined whether or not the temperature detected by the sensor 67 is equal to or higher than the temperature rise end temperature (S8). And when it determines with the 2nd flow switch 72 not being in the state which detected flowing water (S7: No) and it has determined that the detected temperature is not more than temperature rising end temperature (S8: No), Both the determinations are repeatedly executed at regular time intervals.

  On the other hand, when it is determined that the second flow switch 72 is in a state of detecting flowing water (S7: Yes), or when it is determined that the detected temperature is equal to or higher than the temperature rise end temperature (S8: Yes). The heater control means 93 stops driving the heater 63 (S9), and then the pump control means 92 stops driving the circulation pump 61 (S10). And it returns to temperature determination (S2) of temperature rising start temperature. Thus, when hot water from the water heater 1 is not supplied, the circulating pump 61 and the heater 63 are controlled so as to keep the hot water in the circulation channel at a constant temperature (above the temperature rise start temperature and below the temperature rise end temperature). The driving is controlled, and when the hot water is supplied from the water heater 1, the driving of the circulation pump 61 and the heater 63 is controlled so that the circulation pump 61 and the heater 63 are stopped.

  As described above, according to the above-described embodiment, when the second flow switch 72 detects flowing water, since the driving of the circulation pump 61 and the heater 63 is stopped, supply of hot water from the water heater 1 (use of hot water) When the operation is started, the driving of the circulation pump 61 and the heater 63 can be forcibly stopped. Therefore, the situation where the circulation pump 61 and the heater 63 are continuously driven can be avoided, and the power consumption can be suppressed.

  Further, since the mode can be switched between the temperature raising mode and the non-temperature raising mode and the circulation pump 61 and the heater 63 are driven only in the temperature raising mode, the temperature of the hot water in the circulation flow path is increased. Only when the temperature is necessary, the power consumption can be further suppressed by switching to the temperature raising mode.

  Furthermore, since it is a configuration that automatically switches to the temperature rising mode when the temperature rising start time set by the user is reached, for example, by setting the temperature rising start time several minutes before the return time, The hot water in the circulation channel can be kept in a temperature rising state. That is, even if the temperature raising mode is not always set, the hot water in the circulation channel can be kept in a temperature raising state at a necessary time. Therefore, it is possible to avoid the situation where the temperature raising mode is always set, and the power consumption can be further suppressed.

  Furthermore, the safety of the circulation pump unit 2 and the hot water supply system SY incorporating the air vent valve 66 and the overpressure relief valve 73 can be improved.

  In addition, by using a hot water supply double pipe as the hot water supply main pipe 14 and the hot water supply branch pipe 16, the space for piping can be narrowed compared to the case where two hot water pipes for return and return are separately constructed, In addition, it is possible to reduce the number of tube fixing points and the heat insulating material for the tube. Furthermore, the warm water on the outgoing side that passes through the inside of the inner pipe 21 can be kept warm by the warm water on the return side that passes through the outside of the inner pipe 21, thereby effectively preventing the temperature drop of the hot water supplied to the hot water supply terminal A be able to.

  In the above embodiment, the heating tank 64 is interposed in the discharge-side internal flow path 62, but the heating tank 64 may be interposed in the suction-side internal flow path 65.

  Moreover, in the said embodiment, although the hot water supply main pipe 14 was comprised by the hot water supply double pipe, you may comprise the hot water supply main pipe 14 by going back and returning and two hot water supply pipes. Moreover, in the said embodiment, although the hot water supply branch pipe 16 was comprised by the hot water supply double pipe, you may comprise the hot water supply branch pipe 16 by going back and returning and two hot water supply pipes.

  Furthermore, in the said embodiment, although it was the structure which heats up the warm water in a circulation flow path with the heating tank 64 incorporating the heater 63, the structure which heats up the warm water in a circulation flow path with another heating means. It may be.

  In the above embodiment, the user sets the temperature rise start temperature itself. However, the user sets the hot water use start time using the remote controller 5, and the control unit 69 sets the hot water use start time. A few minutes before (the time that has been traced from the hot water use start time by the fixed time required for the temperature to rise to a certain temperature after switching to the temperature rise mode) is set as the temperature rise start time. Also good.

  DESCRIPTION OF SYMBOLS 1: Hot water heater, 2: Circulation pump unit, 3: Connection pipe, 4: Hot water supply piping, 5: Remote controller, 21: Inner pipe, 22: Outer pipe, 61: Circulation pump, 62: Discharge side inner pipe flow path, 63: heater, 64: heating tank, 65: suction side internal flow path, 66: air vent valve, 67: temperature sensor, 69: controller, 71: connection flow path, 72: second flow switch, 73: overpressure Relief valve, SY: Hot water supply system

Claims (8)

A circulation pump unit in which a connecting pipe from a hot water supply forward flow path and a hot water supply heat source is connected to the internal flow path on the discharge port side, and a hot water supply return flow path is connected to the internal flow path on the suction port side,
A circulation pump interposed in the internal flow path on the suction port side ;
A heating tank interposed in the internal flow path on the discharge port side and incorporating a heater;
A connection flow path for connecting the connection pipe to the internal flow path on the discharge port side;
A flowing water detection unit interposed in the connection flow path;
In the internal flow path on the suction port side, an air vent valve provided upstream of the circulation pump;
A control unit for controlling the circulation pump and the heater,
The control unit is configured to stop the circulation pump when the flowing water detection unit detects flowing water.   The circulating pump unit according to claim 1, wherein the control unit stops the heater when the flowing water detection unit detects flowing water. A temperature detection unit for detecting the temperature of the hot water in the internal flow path on the suction port side,
The controller is
The mode is a temperature rising mode for raising the temperature of the hot water in the hot water supply forward flow path and the hot water supply return flow path, and a non-temperature raising mode for not heating the hot water in the hot water supply forward flow path and the hot water supply return flow path. Can be switched between,
In the temperature raising mode, when the temperature detected by the temperature detecting unit becomes equal to or lower than a predetermined temperature raising start temperature, the circulating pump and the heater are started to be driven, and the temperature detected by the temperature detecting unit is The circulation pump unit according to claim 1 or 2, wherein when the temperature rises to a predetermined temperature rise or higher, driving of the circulation pump and the heater is stopped.   The circulating pump unit according to claim 3, wherein the control unit switches the mode to the temperature rising mode when the temperature rising start time set by the temperature rising start time setting unit is reached.   The circulating pump unit according to claim 4, wherein the temperature rise start time setting unit is configured by a remote controller. The circulation pump unit according to claim 1 , further comprising an overpressure relief valve interposed in the connection flow path. A circulating pump unit according to any one of claims 1 to 6 ,
The hot water supply heat source connected to the internal flow path on the discharge port side through the connection pipe;
The hot water supply forward flow path connected to the internal flow path on the discharge port side, and the hot water supply pipe having the hot water supply return flow path connected to the internal flow path on the suction port side. Hot water system. The hot water supply pipe has a hot water supply double pipe including an inner pipe in which the hot water supply forward flow path is configured and an outer pipe in which the hot water return flow path is configured in a gap between the hot water supply pipe and the inner pipe. The hot water supply system according to claim 7 , wherein

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