JP2019044990A - One-can, three-circuit type water heater - Google Patents

Abstract

To provide a one-can, three-circuit type water heater capable of preventing water in a heat exchanger for hot water supply and a heat exchanger for bath, provided in a can body for heating, from being frozen.SOLUTION: A one-can, three-circuit type water heater comprises, in a heat exchange can body 1 for heating, a heat exchanger 4 for hot water supply and a heat exchanger 5 for bath, a heater 37 for freezing prevention provided for a bath circuit C comprising the heat exchanger 5 for bath is provided to at least one of a bath outward pipe 27 or bath return pipe 28 nearby the heat exchange can body 1 for heating, so heat of the heater 37 for freezing prevention is conducted to prevent the bath circuit C from being frozen. Further, the heat of the heater 37 for freezing prevention is conducted even to the heat exchanger 5 for bath in the heat exchange can body 1 for heating and then conducted to a heat medium in the can body 1 for heating from the heat exchanger 5 for bath in the can body 1 for heating to heat the heat medium at a periphery of the heat exchanger 5 for bath, and consequently, the heat medium in the can body 1 for heating rises in temperature to prevent freezing nearby the heat exchanger 4 for hot water supply of a hot wat er supply circuit B.SELECTED DRAWING: Figure 1

Description

   The present invention relates to a one-can three-circuit water heater having three circuits of hot water supply, heating, and bath in one can.

  Conventionally, in this type of thing, a heat exchanger for hot water supply and a heat exchanger for bath are provided in a can body in which a heat medium for heating is stored, and heating, hot water supply, reheating of hot water, and heat retention are all performed. It did well. (For example, refer to patent document 1.)

  Moreover, in order to prevent the freezing of the bath circuit, the outside air temperature and the temperature of the circulating hot water of the bath circuit are detected, and the bath circulation pump is driven by the detected temperature. (For example, refer to patent document 2.)

JP 2001-65884 JP-A-2002-250558

  By the way, in this prior art, although the heat medium for heating stored in the can body is used which does not freeze even when the temperature becomes lower than 0 ° C., the circuits of hot water supply, heating, and bath at night of winter are used When the outside air temperature drops without being completely used, the heating heat medium stored in the can becomes 0 ° C. or less, so the hot water heat exchanger and the bath heat exchanger provided in the can Water could freeze.

  At this time, even if the bath circulation pump is driven to perform the antifreeze operation, if the water in the bath heat exchanger provided in the can freezes, the hot water in the bath can not be circulated, and the bath can not be circulated. The circuit would freeze.

  Also, in order to prevent the occurrence of freezing in this way, the heating heat medium for heating stored in the can is heated by burning the burner even if the circuits of hot water supply, heating, and bath are not all used. The problem is that the temperature must be raised and wasteful combustion operation must be performed.

  In order to solve the above problems, according to claim 1 of the present invention, a burner unit and a heat exchange can body for heating in which an inner heat medium is heated by the combustion of the burner unit, and the heat exchange can body for heating. A hot water supply circuit that includes a hot water supply heat exchanger and performs indirect heating by supplying heat indirectly with the heat medium to which water is supplied, and a heat exchanger for bath inside the heat exchange can body, the bath water is heated And a bath circuit for indirectly heating with the heat medium to follow up, the bath circuit connecting the bath and the bath heat exchanger in the heating heat exchange can to the bath circuit, a bath return pipe and freezing In the one provided with the prevention heater, the antifreeze heater is provided in at least one of the bath passing pipe or the bath return pipe in the vicinity of the heating heat exchange can body.

  In the second aspect of the invention, the hot water supply heat exchanger is provided above the heating heat exchange can body, and the bath heat exchanger is provided below the heating heat exchange can body.

  In the third aspect, the bath circuit includes a bath circulation pump, a three-way valve, and a bath bypass pipe, and the bath tub, the bath forward pipe, the bath return pipe, the bath circulation pump, the three-way valve, and the bath bypass pipe. A pipe and a bypass circuit are formed, the antifreeze heater is provided on the heating heat exchanger side with respect to the bypass circuit, and the antifreeze operation in the bypass circuit is performed by driving the bath circulation pump, The antifreeze operation from the bypass circuit to the bath heat exchanger in the heating heat exchanger can be performed by energizing the antifreeze heater.

  According to the first aspect of the present invention, since the antifreeze heater is provided on at least one of the bathing pipe or the bath return pipe near the heating exchanger, the heat of the antifreeze heater is transferred. It is possible to prevent freezing of the bath circuit.

  In addition, the heat of the antifreeze heater transfers heat to the bath heat exchanger in the heating heat exchanger, transfers from the bath heat exchanger in the heating can to the heat medium in the heating can, and so on. The heat medium in the vicinity of the heat exchanger is heated, whereby the temperature of the heat medium in the heating can rises to prevent freezing in the vicinity of the hot water heat exchanger in the hot water supply circuit.

  According to the second aspect of the invention, the hot water supply heat exchanger is provided above the heating heat exchange can body, and the bath heat exchanger is provided below the heating heat exchange can body. The heat is also transferred to the bath heat exchanger in the heating heat exchange can, and the heat is transferred from the bath heat exchanger in the heating can to the heat medium in the heating can to be heated. The surrounding heat medium rises in the heating can, and the heat medium above the heating can falls because the temperature is low, whereby the heat medium in the heating can convects up and down, and the heating can The temperature of the entire heat medium in the body rises, and the hot water supply heat exchanger provided above the heating can transfers heat from the heat medium whose temperature has risen and is heated, whereby the hot water heat exchange of the hot water supply circuit Freezing in the vicinity of the vessel can be prevented.

  According to a third aspect, the bath circuit includes a bath circulation pump, a three-way valve and a bath bypass pipe, and the bathtub, the bath forward pipe, the bath return pipe, the bath circulation pump, the three-way valve and the bath circulation pipe. A bypass circuit is constituted by a bath bypass pipe, the antifreeze heater is provided on the heating heat exchanger side with respect to the bypass circuit, and the antifreeze operation in the bypass circuit is performed by driving the bath circulation pump. Since the antifreeze operation from the bypass circuit to the bath heat exchanger in the heating heat exchanger can be performed by energizing the antifreeze heater, a bath circulation pump, a bath bypass pipe, a three-way valve, etc. The freezing of the bypass circuit in the bath circuit up to the bathtub can be prevented by driving the circulation pump, and the bath from the bypass circuit to the bath heat exchanger in the heat exchanger can be taken. Freezing of road in which can be prevented by energizing the antifreeze heater.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of 1 can 3 circuit-type hot-water supply device to which this invention one Example was attached. The flowchart figure of the same antifreeze operation.

Next, an embodiment of the present invention will be described based on the drawings.
Reference numeral 1 denotes a heating can body having a combustion chamber 3 provided with a burner unit 2 for heating at the lower part, and a heat exchanger for hot water supply constituting a heat exchanger for hot water supply of indirect heating type by a serpentine tube inside this can body 1 Exchanger 4 and bath heat exchanger 5 constituting a heat exchanger for indirectly heating type bathing by a flexible tube are disposed at the top and bottom to perform hot water heating and simultaneously perform hot water supply and bathing simultaneously or individually. It is something that can be done.

  First, the heating circuit A will be described. 6 is a heating forward pipe, 7 is a heating radiator such as a floor heating panel, 8 is a heating return pipe, 9 is a heating circulation pump, 10 is a gas-liquid separator, 11 is The expansion tank for heating, 12 is a heating bypass pipe provided with an on-off valve 13, 14 is a can temperature sensor used for temperature control of the heating can 1, and the can can be burned by the burner unit 2 in the heating can 1. The heat medium heated to the control target temperature (88 ° C. or higher) of the body temperature sensor 14 is sent to the heating radiator 7 via the heating forward pipe 6 by the heating circulation pump 9 to perform heating, and the heat radiation for heating Low temperature water (about 30 ° C. to 50 ° C.) radiated by the heater 7 returns to the heating can 1 via the heating return pipe 8 and is again heated to the control target temperature and circulated.

  Next, the hot water supply circuit B will be described. 15 is a water supply pipe connected to the water supply, 16 is a flow rate sensor for detecting the flow rate of water, 17 is a hot water supply pipe for discharging hot water heated by the hot water supply heat exchanger 4, 18 Is a hot water supply tap; 19 is a hot water supply bypass pipe connected to the hot water supply pipe 17 via the mixing valve 20 to communicate the water supply pipe 15 with the hot water supply pipe 17; 21 is a thermal expansion for absorbing hot expansion when the hot water supply plug 18 is closed The tank 22, the feed water temperature sensor 22, and the hot water supply temperature sensor 23. When the hot water supply valve 18 is opened and the flow sensor 16 detects the minimum operating flow rate, the temperature of the heat medium in the heating can 1 is about 88.degree. Combustion is performed by the burner unit 2 so as to maintain high temperature, and the cold water from the water supply pipe 15 is indirectly heated by the high temperature heat medium in the heating can 1 by the hot water supply heat exchanger 4 and is mixed with tap water by the mixing valve 20 Mixed, adjusted to appropriate temperature, and supplied hot water 18 is intended to be hot water from.

  24 is a antifreeze heater for hot water supply pipe, which generates heat when energized and prevents water in the hot water supply pipe 17 from freezing, and 25 is an antifreeze heater for water supply pipe, which generates heat when energized. , And prevent water in the water supply pipe 15 from freezing.

  Next, the bath circuit C will be described. 26 is a bath / bath, 27 is a bathing pipe, 28 is a bath return pipe, 29 is a bath circulation pump provided in the bath return pipe 28, and 30 is a flowing water switch for detecting presence or absence of circulation. 31 is a bath temperature sensor, and when there is a request to boil the hot water in the bath 26, the hot water in the bath 26 is circulated by the bath circulation pump 29 to the bath heat exchanger 5, and the hot water in the bath 26 is for heating By indirectly heating with the high temperature heat medium in the can 1, the hot water in the bath 26 is heated to a suitable temperature and kept warm.

  And 32 is a hot water pipe branched from the hot water supply pipe 17 of the hot water supply circuit B and connected to the bath circuit C via the hot water filling valve 33 and the three-way valve 34, and the three-way valve 34 The bath circuit C and the water filling pipe 32 are switched so as to communicate with each other and the water filling valve 33 is opened, and the hot water heated by the hot water supply heat exchanger 4 is made to flow into the bath circuit C and constant to the bath tub 26. The amount of hot water is done.

  Reference numeral 35 denotes a three-way valve for a bath circuit, which is provided in the bath transfer pipe 27 and one end is connected to the other end of the bath bypass pipe 36 connected between the bath circulation pump 29 of the bath return pipe 28 and the three-way valve 34 It is

  The reference numeral 37 denotes a bath piping antifreeze heater, which generates heat when energized and prevents water in the bath circuit from freezing, and the heat of the bath piping antifreeze heater 37 is supplied from the bath passing pipe 27. It is provided in the bath return pipe 27 in the vicinity of the connection portion between the bath heat exchanger 5 and the bath return pipe 27 at a position where heat is transferred to the heat medium in the heating can 1 via the bath heat exchanger 5 It is

Here, 38 is a communication pipe connecting the upper and lower portions of the heating can 1, and 39 is a stirring circulation pump provided in the middle of the communication pipe 38, which is driven during hot water supply or bath operation to generate the heating can 1 The internal temperature is uniformed up and down, and agitation is performed continuously until the hot water supply or bath operation is finished.
In addition, since the circulation pump 9 for heating is driven at the time of heating operation, it is also possible not to drive the circulation pump 39 for stirring.

  Denoted at 40 is an antifreezing sensor which is provided in a frame 41 which accommodates the above-mentioned components and which is installed outdoors, and which detects the temperature in the frame 41.

The operation of this embodiment will now be described.
First, to describe the heating operation, the can temperature sensor 14 detects the temperature in the heating can 1, and this temperature is approximately 80 ° C. in the case of high temperature heating load and approximately 60 ° C. in the case of low temperature heating load. Control the combustion of the burner unit 2 and drive the heating circulation pump 9 to heat the heat medium such as hot water, circulating fluid and antifreeze liquid in the heating can 1 to the heating radiator 7 The circulation is repeated, and the circulation is returned to the heating can 1 again to heat the room by the heating radiator 7.

  Next, in the hot water supply operation, when the heating operation is performed, the inside of the heating can 1 is already at a high temperature, so if the hot water supply plug 18 is opened, the low temperature water from the water supply pipe 15 is immediately used for hot water supply The heating medium is indirectly heated by the high temperature heat medium in the heating can 1 by the heat exchanger 4 and at the same time, the stirring circulation pump 39 is driven to drive the hot water in the lower part of the can 1 through the communicating pipe 38 It is supplied to the upper part and stirring of the heating can 1 is performed to eliminate the temperature difference between the upper and lower inside of the heating can 1 so that heat exchange can be always performed with the same heat exchange efficiency to supply hot water of a desired temperature. It is a thing.

  Next, when there is a boil-up request of the hot water in the bath tub 26 such as turning on the bath heat switch of a remote control (not shown), the bath operation drives the circulation pump 29 for bath and heat exchange of hot water in the bath tub 26 The water temperature in the bath 26 is heated to a desired temperature and kept warm by heating with the heat medium in the heating can 1 kept at high temperature, and the bath temperature sensor 31 Is automatically stopped when the desired temperature is detected.

  Next, the antifreeze operation in the bath circuit C will be described according to the flowchart shown in FIG. 2 when the outside air temperature drops and the temperature in the frame 41 decreases and the antifreeze sensor 40 detects less than 0 ° C. (S1) The bath circulation pump 29 is always on and driven, and the bath piping freezing prevention heater 37 is always on and energized. (S2)

  Then, when the antifreezing sensor 40 does not detect less than 0 ° C. in the above (S1), when the detection temperature of the antifreezing sensor 40 next detects 3 to 0 ° C. (S3), the bath circulation pump 29 is set to 4 minutes Perform ON-OFF operation to turn off and stop for 30 minutes once after turning on and driving, and 3 times ON-OFF operation to turn off for 6 minutes after turning on the antifreeze heater 37 for bath piping for 4 minutes It is something to do. (S4)

  Then, when the antifreezing sensor 40 does not detect 3 to 0 ° C. in the above (S3), when the detection temperature of the antifreezing sensor 40 next detects 5 ° C. or lower (S5), the bath circulation pump 29 is turned on for 1 minute Perform ON-OFF operation to turn OFF and stop for 30 minutes once after turning ON and drive, and 3 times ON-OFF operation to turn OFF the antifreeze heater 37 for bath piping for 2 minutes and turn it on for 8 minutes It is something to do. (S6)

And after performing the antifreeze operation of said (S2), (S4), (S6), when the detection temperature of antifreeze sensor 40 detects a temperature higher than 5 degreeC (S7), bath circulation pump 29 is always always It turns OFF and stops, and the antifreeze heater 37 for bath piping is always turned OFF so as to be in a non-energized state, and the antifreeze operation is ended (S8), and the process returns to (S1).
If the temperature detected by the antifreeze sensor 40 does not detect a temperature higher than 5 ° C. in (S7), it is determined that the antifreeze operation is still necessary, and the process returns to (S1).

  As described above, since the three-way valve 35 for the bath circuit operates on the side of the bath bypass pipe 36 when performing the antifreeze operation, the hot and cold water in the bath 26 flows from the bath 26 through the bath return pipe 28 and the bath circulation pump 29 By passing through the bath bypass pipe 36 and flowing through the three-way valve 35 for the bath circuit and returning from the bath forward pipe 27 into the bath tub 26, the bath circulation pump 29, bath bypass pipe 36 and three-way valve for bath circuit It is for preventing the freezing of the bypass circuit in the bath circuit C up to the bathtub 26 and 35.

  Further, when the antifreeze heater 37 for bath piping provided in the bath return pipe 27 in the vicinity of the connection portion of the heat exchanger 5 for bath and the bath return pipe 27 is energized, the antifreeze heater 37 for bath piping generates heat. The heat is transferred to the bath forward pipe 27 to prevent freezing from the position of the antifreeze heater 37 for bath piping to the three-way valve 34 and the bath circulation pump 29.

  Further, the heat generated by the antifreeze heater 37 for bath piping is also transferred to the heat exchanger 5 for bath, and the freezing of the bath circuit C from the bypass circuit in the bath circuit C to the heat exchanger 5 for bath is prevented. .

Further, heat is transferred from the bath heat exchanger 5 in the heating can 1 to the heat medium in the heating can 1 so that the heat medium around the bath heat exchanger 5 is heated.
Since the bath heat exchanger 5 is provided below the heating can 1, the heat medium around the bath heat exchanger 5 heated by heat transfer from the bath heat exchanger 5 is heated. As it rises inside the can body 1 and the heat medium above the inside of the heating can body 1 drops, the temperature is low.

  As a result, the heat medium in the heating can 1 convects up and down, the temperature of the total heat medium in the heating can 1 rises, and the heat exchange for hot water provided above the heating can 1 The vessel 4 transfers heat from the heat medium whose temperature has risen to be heated, whereby freezing of the hot water supply heat exchanger 4 and the vicinity thereof of the hot water supply circuit B is prevented.

  In the present embodiment, when the antifreeze heater 37 for bath piping is constantly turned on and energized while the detection temperature of the antifreeze sensor 40 is -20 ° C., the temperature of the total heat medium in the heating can 1 is 10 A temperature of about ° C. is maintained.

In addition, although the antifreeze heater 37 for bath piping was provided in the bath traveling pipe 27 in the vicinity of the connection portion of the bath heat exchanger 5 and the bath traveling pipe 27 in the present embodiment, the present invention is not limited thereto. It may be provided in the bath return pipe 28 in the vicinity of the connection portion of the bath return pipe 28, and is preferably provided in the lower connection part of the bath heat exchanger 5.
Alternatively, it may be provided both in the bath return pipe 28 near the connection portion of the bath heat exchanger 5 and the bath return pipe 28 and in the bath return pipe 27 near the connection portion of the bath heat exchanger 5 and the bath return pipe 27. It is good.

  In the present embodiment, the antifreezing operation by the antifreeze heater 37 for bath piping has been described, but the antifreezing operation of the hot water supply circuit B is performed by the antifreeze heater 24 for hot water supply pipe or the water supply pipe The prevention heater 25 is energized to prevent the water in the hot water supply pipe 17 and the water in the water supply pipe 15 from freezing.

1 heat exchange can body for heating 2 burner part 4 heat exchanger for hot water supply 5 heat exchanger for bath
26 bath 27 bath forward pipe 28 bath return pipe 37 antifreeze heater B hot water circuit C bath circuit

Claims (3)

  A burner unit and a heat exchange can body for heating in which a heat medium on the inner side is heated by the combustion of the burner unit, and a heat exchanger for hot water supply in the heat exchange can body for heating, the heat medium heated with water supply A hot water supply circuit that performs indirect heating and hot water supply, and a bath circuit that includes a bath heat exchanger in the heating heat exchange body and performs indirect heating by indirectly heating the bath water with the heated heating medium; The antifreeze heater comprising a bath return pipe for connecting a bath tub and the bath heat exchanger in the heating heat exchanger, a bath return pipe, and a freeze protection heater in the bath circuit; The one-can three-circuit water heater according to the present invention is provided on at least one of the bathing pipe and the bath return pipe in the vicinity of the heating heat exchange can body.   The can for hot water supply heat exchanger is provided above the heating heat exchanger can, and the bath heat exchanger is provided below the heating heat exchanger can. Circuit water heater.   The bath circuit includes a bath circulation pump, a three-way valve, and a bath bypass pipe, and a bypass circuit is configured by the bath tub, the bath forward pipe, the bath return pipe, the bath circulation pump, the three-way valve, and the bath bypass pipe. The antifreeze heater is provided closer to the heating heat exchanger body than the bypass circuit, and the antifreeze operation in the bypass circuit is performed by driving the bath circulation pump, and the bypass circuit is operated from the bypass heat circuit. The one-can three-circuit water heater according to claim 2, wherein the antifreeze operation up to the bath heat exchanger in the cross can is performed by energizing the antifreeze heater.

Images