JP2012032031A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater which reduces a pressure increase when starting a priming process to supply priming water to a bath circulation pump.SOLUTION: In the hot water storage type water heater, when starting the priming process to supply priming water necessary for starting a bath circulation pump 18 by pouring the predetermined amount of hot water from a hot water supply tube 22 to a bath circulation circuit 15, an open/close valve 23 to open/close the hot water supply tube 22 is opened to start hot water pouring after a switching means 27 formed in the bath circulation circuit 15 is set in a two-way conveying state where hot water is poured from both of a bath going tube 16 and a bath returning tube 17 to a bath tub 5, and immediately after the opening of the open/close valve 23, the switching means 27 is changed over to a one-way conveying state where hot water is poured to the bath tub 5 only from the bath circulation circuit 15 on the side where the bath circulation pump 18 is disposed. Thus, a pressure increase occurring in a moment when opening of the open/close valve 23 is dispersed to both of the bath going tube 16 and the bath returning tube 17 to be reduced, and priming of the bath circulation pump 18 is surely executed.

Description

  The present invention relates to a hot water storage type hot water supply apparatus in which an increase in pressure when starting a priming process to a bath circulation pump is reduced.

  In a conventional hot water storage type hot water supply apparatus of this type, as shown in FIG. 4, a hot water storage tank 101 for storing hot water, heating means 102 for heating the hot water in the hot water storage tank 101, and a pressure reducing valve at the lower part of the hot water storage tank 101. A hot water supply pipe 104 connected to the hot water storage tank 101 through the hot water storage tank 101, a hot water supply pipe 105 connected to the upper part of the hot water storage tank 101, a water supply bypass pipe 106 branched from the water supply pipe 104, and hot water and hot water supply bypass from the hot water supply pipe 105. A mixing valve 107 that mixes water from the pipe 106 into hot water at a set temperature, and a hot water supply pipe 109 that supplies hot water at a set temperature mixed by the mixing valve 107 to a hot water tap 108 provided in a kitchen, a washroom, or the like. A bath 110, a bath heat exchanger 111 that exchanges the bathtub water of the bathtub 110 with hot water in the hot water storage tank 101, and a wind that connects the bathtub 110 and the bath heat exchanger 111. Bypass the bath circulation circuit 114 comprising the forward pipe 112 and the bath return pipe 113, the bath circulation pump 115 provided in the bath return pipe 113 and circulating the bath water of the bathtub 110 to the bath circulation circuit 114, and the bath heat exchanger 111. A bath bypass pipe 116 for connecting the bath return pipe 112 and the bath return pipe 113, and a one-carrying state in which the bath 110 is poured from only the bath return pipe 113 into the bathtub 110. And a bath three-way valve 117 that can be switched to both the conveying state in which the hot water is poured into the bathtub 110 from both the bath outlet pipe 112 and the bath return pipe 113, and hot water in the hot water storage tank 101 connected to the bath return pipe 113. A hot water filling pipe 118 for pouring hot water and a hot water solenoid valve 119 for opening and closing the hot water filling pipe 118 are provided. For example, the bath three-way valve 117 is placed in a one-sided conveyance state, and the hot water solenoid valve 119 that opens and closes the hot water pipe 118 is opened, and a predetermined amount of hot water is poured only into the bath return pipe 113 side. Some performed a priming process to supply the necessary priming water. (For example, refer to Patent Document 1).

  In recent years, there has been an increase in the pressure setting of the pressure reducing valve 103 higher than before due to the need to supply hot water at a sufficient flow rate even at high places on the second and third floors of a house. In the hot water storage hot water supply apparatus in which the set pressure of the pressure reducing valve 103 is set high, when the priming process is performed, the bath return pipe is opened at the moment when the hot water solenoid valve 119 for opening and closing the hot water pipe 118 is opened. The pressure applied to the 113 side suddenly increases due to water hammer, thereby causing damage to functional components such as the bath circulation pump 115 provided in the bath return pipe 113, and leakage due to disconnection or damage of the piping constituting the bath circulation circuit 114. Etc. may occur.

  Therefore, when the priming step is performed, a special mixing valve 107 having a function that can be closed without flowing mixed hot water on the hot water supply pipe 109 side as disclosed in Patent Document 2 is used. After opening the tension solenoid valve 119, drive the mixing valve 107 from the closed state, adjust the flow rate at the start of pouring so as to become hot water after the water gradually increases, so that water hammer does not occur, Some pressures applied to functional parts such as the bath return pipe 113 and the bath circulation pump 115 provided in the bath return pipe 113 can be reduced and the bath circulation pump 115 can be surely irrigated.

JP 2006-177625 A JP 2009-222268 A

  By the way, the conventional hot water storage type hot water supply apparatus must be equipped with a dedicated part that can adjust the pouring flow rate supplied to the bath circulation circuit 114, such as providing the mixing valve 107 with a closing function, which increases the cost. It became the factor of.

  Therefore, the present invention provides a simple method without providing a dedicated part, and pressure caused by water hammer applied to functional parts such as the bath circulation circuit 114 and the bath circulation pump 115 on the side provided with the bath circulation pump 115 in the priming process. It is an object of the present invention to provide a hot water storage type hot water supply device that can reduce the amount of water and reliably perform priming to the bath circulation pump 115.

  Therefore, in order to solve the above-mentioned problems, the present invention particularly has a configuration according to claim 1 in which a hot water storage tank for storing hot water and a bath heat for heating the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank. A bath circulation circuit composed of an exchanger, a bath outlet pipe and a bath return pipe connecting the bathtub and the bath heat exchanger, a bath circulation pump provided in the bath circulation circuit for circulating bath water, and the bath circulation A hot water pipe connected to a circuit for pouring hot water in the hot water storage tank into the bathtub, an on-off valve for opening and closing the hot water pipe, and a side provided with the bath circulation pump provided in the bath circulation circuit Switchable between a single conveying state in which hot water can be poured into the bathtub only from the bath circulation circuit and a double conveying state in which hot water can be poured into the bathtub from both the bath outlet pipe and the bath return pipe. Switching means A hot water storage type hot water supply apparatus for performing a priming process for supplying a priming water necessary for starting the bath circulation pump by pouring a predetermined amount from the hot water filled pipe to the bath circulation circuit, at the start of the priming process, After the switching means is in the both transport states, the on-off valve is opened to start pouring, and immediately after the on-off valve is opened, the switching means is switched to the single transport state.

  In the present invention, the switching means is an electric valve.

  According to the first aspect of the present invention, at the time of starting the priming process, the switching means is set to the both conveying state, and then the on-off valve is opened to start pouring, so that the water generated at the moment when the on-off valve is opened. The pressure rise due to the blow can be distributed and reduced in both the bath return pipe and the bath return pipe, damage to functional parts such as the bath circulation pump, and disconnection of the piping that constitutes the bath circulation circuit on the side equipped with the bath circulation pump Further, water leakage due to damage or damage can be prevented, and the priming water to the bath circulation pump can be reliably performed by switching the switching means to the single conveying state immediately after the opening / closing valve is opened.

  According to the second aspect of the present invention, since the switching means is an electric valve, the switching from the two transport states during the priming process to the one transport state is gradually performed, so the bath on the side provided with the bath circulation pump It is possible to prevent sudden pressure from being applied to the circulation circuit.

The schematic block diagram of one Embodiment of the hot water storage type hot water supply apparatus of this invention. Operation | movement explanatory drawing of the bath three-way valve of the same embodiment. The flowchart which shows the priming process of the bath circulation pump of the same embodiment. The schematic block diagram of the conventional hot water storage type hot-water supply apparatus.

Next, an embodiment of the present invention will be described with reference to FIG.
1 is a hot water storage tank unit having a hot water storage tank 2 for storing hot water, 3 is a hot water tap provided in a kitchen, a washroom, etc., 4 is a remote controller for remotely operating the hot water storage type hot water supply device, and 5 is a bathtub.

  A water supply pipe 6 is connected to the lower part of the hot water storage tank 2 to supply water to the hot water storage tank 2, and 7 is a pressure reducing valve provided in the middle of the water supply pipe 6 to reduce the water supply pressure to a predetermined pressure. 260 kPa. Reference numeral 8 denotes a hot water discharge pipe connected to the upper part of the hot water storage tank 2 to take out hot water from the upper part of the hot water storage tank 2.

  9 is a water supply bypass pipe branched from the water supply pipe 6 on the downstream side of the pressure reducing valve 7, and 10 is an internal valve body (so that hot water from the hot water discharge pipe 8 and water from the water supply bypass pipe 9 are set to a set temperature. (Not shown) is a mixing valve that mixes by adjusting the valve opening, 11 is a hot water supply pipe that supplies hot water mixed by the mixing valve 10 to the hot water tap 3, and 12 is the temperature of hot water after mixing by the mixing valve 10. A hot water temperature sensor 13 for detecting the hot water flow rate sensor 13 counts the hot water flow rate.

  A bath heat exchanger 14 is arranged at the upper part in the hot water storage tank 2 and is made of a stainless steel tube for heat exchange by heating the bath water of the bath 5 with hot water in the hot water storage tank 2, and 15 is a bath 5 and a bath. A bath circulation circuit 18 comprising a bath outlet pipe 16 and a bath return pipe 17 connected to the heat exchanger 14 is provided in the bath return pipe 17, and the bath water in the bathtub 5 is exchanged with the bath heat via the bath return pipe 17. It is a bath circulation pump that circulates the bathtub water that has been sent to the vessel 14 and passed through the bath heat exchanger 14 so as to be returned to the bathtub 5 through the bath outlet pipe 16.

  Reference numeral 19 denotes a running water switch provided on the bath return pipe 17 for detecting the presence or absence of running water. Reference numeral 20 denotes a bath temperature sensor provided on the bath return pipe 17 for detecting the temperature of the bath water flowing out of the bathtub 5 and flowing into the bath heat exchanger 14. , 21 is a water level sensor provided as a water level detecting means provided near the bathtub 5 of the bath return pipe 17 to detect the water level in the bathtub 5 from the water pressure of the bathtub water.

  22 is branched from the middle of the hot water supply pipe 11 and is connected to the bath return pipe 17 on the side of the bath heat exchanger 14 from the position where the bath circulation pump 18 is arranged, and hot water for pouring hot water in the hot water storage tank 2 into the bathtub 5. Tension pipe 23 is a hot water solenoid valve as an open / close valve that opens and closes the hot water pipe 22 to start and stop pouring water into the bathtub 5, 24 is a bath flow sensor that counts the amount of hot water poured into the bathtub 5, and 25 It is a check valve arranged twice to prevent the bathtub water in the bathtub 5 from flowing backward.

  26 is a bath bypass pipe that bypasses the bath heat exchanger 14 and connects the bath outlet pipe 16 and the bath return pipe 17, and 27 is a bath heat exchanger 14 side from the connection between the hot water filled pipe 22 and the bath return pipe 17. Bath return pipe 17, which is provided at a connection portion between the bath bypass pipe 26 and the bath return pipe 17, and has a one-port state in which hot water is poured into the bathtub 5 from only the bath return pipe 17, the bath return pipe 16 and the bath return pipe. 17 is a bath three-way valve as a switching means composed of an electric three-way valve that can be switched to both conveying states in which the hot water is poured into the bathtub 5 from both.

  The bath three-way valve 27 connects the bathtub 5 side of the bath return pipe 17 to the inflow side connection port 27a, and one of the two outflow side connection ports 27b and 27c has a bath heat exchanger. As shown in FIG. 2 (a), the inlet side of 14 is connected, the bath bypass pipe 26 is connected to the other connection port 27c, and the inner valve body is moved by the drive of an electric motor (not shown). In addition, the bath 5 side and the bath bypass pipe 26 side of the bath return pipe 17 are connected to each other, and the entrance side of the bath heat exchanger 14 is closed, so that both the bath going-out pipe 16 and the bath return pipe 17 are poured into the bathtub 5. As shown in FIG. 2 (a), both the conveying state in which hot water is allowed to flow and the bath 5 side of the bath return pipe 17 and the inlet side of the bath heat exchanger 14 are connected to close the bath bypass pipe 26 side. The bath 5 is poured from both the bath outlet pipe 16 and the bath return pipe 17. 2 at least, and as shown in FIG. 2 (c), at least the bath return pipe 17 is closed in the bathtub 5 side and the bath return pipe 17 alone can be poured into the bathtub 5 at least. It can be switched.

  Reference numeral 28 denotes an electric heater as a heating means for heating the hot water in the hot water storage tank 2. Here, an electric heater is applied as an example of the heating means, but the heating means may be a heat pump type heating means or a combustion burner using kerosene or gas as fuel.

  Reference numeral 29 denotes a hot water supply temperature sensor 12, a hot water supply flow rate sensor 13, a flowing water switch 19, a bath temperature sensor 20, a water level sensor 21, and a bath flow rate sensor 24 in the hot water storage tank unit 1, and receives a mixing valve 10, a bath circulation pump 18, a bath The control means 29 is a control means for controlling the driving of the three-way valve 27 and the hot water solenoid valve 23. The control means 29 is communicably connected to the remote controller 4 by radio or wire.

  The remote controller 4 includes a hot water supply temperature setting switch 30 for setting a hot water supply set temperature, a bath temperature setting switch 31 for setting a bath set temperature, and a hot water amount setting switch (see FIG. A hot water filling switch 32 for instructing a hot water filling operation for pouring a hot water amount set in (not shown) is provided.

  Next, the priming process of the bath circulation pump 18 which is a characteristic operation of the hot water storage type hot water supply apparatus shown in FIG. 1 will be described with reference to the flowchart of FIG. To do.

  When the hot water filling switch 32 of the remote controller 4 is operated by the user, first, a priming process for supplying priming water necessary for starting the bath circulation pump 18 is started, and the control means 29 controls the bath three-way valve 27 as shown in FIG. As shown in a), the bath return pipe 17 is connected to the bathtub 5 side and the bath bypass pipe 26 side, the entrance side of the bath heat exchanger 14 is closed, and the bath return pipe 17 and the bath return pipe 17 are both closed. Then, the control means 29 opens the hot water solenoid valve 23 to start pouring (step S2), and immediately after that, the bath 5 can be poured into the bathtub 5 (step S1). The valve body of the three-way valve 27 is rotated by an electric motor to close the bathtub 5 side of the bath return pipe 17 as shown in FIG. 2 (C) from both conveying states as shown in FIG. 2 (A). , Pour hot water into the bathtub 5 only from the bath return pipe 17 It is intended to switch gradually at one conveying ready for bets (step S3). When the hot water solenoid valve 23 is opened, hot water obtained by mixing hot water from the hot water outlet pipe 8 and water from the water supply bypass pipe 9 to the bath set temperature by the mixing valve 10 is filled from the hot water supply pipe 11. Hot water is poured into the bath circulation circuit 15 through the pipe 22.

  Then, the control means 29 determines whether or not a predetermined amount, for example, 10 L, has been poured from the integrated value of the hot water amount detected by the bath flow sensor 24 (step S4), and determines that a predetermined amount has been poured. Then, it is determined that the priming water to the bath circulation pump 18 and the air removal from the bath return pipe 17 have been completed, the hot water filling electromagnetic valve 23 is closed (step S5), and the priming process is completed.

  When the priming step is completed, the control means 29 drives the bath circulation pump 18 for a certain period of time, and checks the presence or absence of running water with the running water switch 19 during that time. Since there is no hot water in the bathtub 5 when there is no running water, the bath three-way valve 27 is set to the both-transport state as shown in FIG. 2A, the hot water solenoid valve 23 is opened, and the bath flow sensor When the integrated value of the hot water amount detected by 24 reaches the set hot water amount, the hot water solenoid valve 23 is closed to complete the hot water operation.

  At the start of the priming process of the bath circulation pump 18 described above, in step S1, the control means 29 sets the bath three-way valve 27 to the bathtub 5 side of the bath return pipe 17 as shown in FIG. After the bath bypass pipe 26 side is communicated and the entrance side of the bath heat exchanger 14 is closed, both the bath outlet pipe 16 and the bath return pipe 17 can be poured into the bathtub 5 from both transport states. Even if the set pressure of the pressure reducing valve 7 is set high by opening the hot water solenoid valve 23 in step S2, the pressure rise due to water hammer generated at the moment when the hot water solenoid valve 23 is opened. Can be dispersed and reduced in both the bath return pipe 16 and the bath return pipe 17, the functional parts such as the bath circulation pump 18 and the water level sensor 21 are broken, and the bath return pipe 17 including the bath circulation pump 18 is configured. Disconnection of piping It is capable of preventing water leakage due to damage.

  Further, immediately after opening the hot water solenoid valve 23, the control means 29 rotates the valve body of the bath three-way valve 27 with an electric motor in the step S3, so that both conveyances as shown in FIG. From the state, as shown in FIG. 2 (c), the bathtub 5 side of the bath return pipe 17 is closed, and gradually switched to a single conveyance state where only the bath return pipe 17 can be poured into the bathtub 5, It is possible to prevent sudden pressure from being applied to the bath return pipe 17 provided with the bath circulation pump 18, and to increase the pressure of the hot water flowing through the bath return pipe 17 by pouring a predetermined amount of water in the one-side transport state. In addition, the flow rate can be increased and the bath circulation pump 18 can be priming water reliably, and the air return from the bath return pipe 17 can be surely removed, thereby preventing erroneous detection of the water level by the water level sensor 21 due to air contamination. Can do That.

Moreover, in this embodiment, in the priming process of the bath circulation pump 18, in the step S1,
Although the bath three-way valve 27 is in the both-transport state as shown in FIG. 2 (a), the bath three-way valve 27 may be in the both-transport state as shown in FIG. 2 (a). Various modifications are possible without departing from the scope of the gist, and this is not disturbed.

  Further, in the present embodiment, the priming process of the bath circulation pump 18 has been described by taking the hot water filling operation as an example. However, the priming water described above is not limited to the hot water filling operation but when priming water to the bath circulation pump 18. By performing the process, it is possible to reduce the pressure increase due to the water hammer generated during the priming process, and to reliably perform the priming to the bath circulation pump 18.

2 Hot Water Storage Tank 5 Bath 14 Bath Heat Exchanger 15 Bath Circulation Circuit 16 Bath Outward Pipe 17 Bath Return Pipe 18 Bath Circulation Pump 22 Hot Water Pipe 23 Hot Water Solenoid Valve 27 Three Way Valve

Claims (2)

  A hot water storage tank that stores hot water, a bath heat exchanger that heats the bathtub water in the bathtub by exchanging heat with the hot water in the hot water storage tank, a bath pipe that connects the bathtub and the bath heat exchanger, and a bath return A bath circulation circuit comprising a pipe, a bath circulation pump provided in the bath circulation circuit for circulating bath water, a hot water pipe connected to the bath circulation circuit for pouring hot water in the hot water storage tank into the bathtub, An on-off valve that opens and closes the hot-water pipe, a single-conveyed state in which hot water can be poured into the bathtub only from the bath circulation circuit provided in the bath circulation circuit and provided with the bath circulation pump, and the bath Switching means capable of switching between both the forward pipe and the bath return pipe to be able to pour water into the bathtub, and pouring a predetermined amount from the hot water pipe to the bath circulation circuit. The bath circulation port In the hot water storage type hot water supply apparatus that executes a priming process for supplying priming water necessary for starting the pump, at the start of the priming process, the switching means is set to the both conveying state, and then the on-off valve is opened to pour hot water. A hot water storage type hot water supply apparatus, characterized in that it is started and the switching means is switched to the one-transport state immediately after the opening / closing valve is opened.   The hot water storage type hot water supply apparatus according to claim 1, wherein the switching means is an electric valve.

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