JP3934871B2 - Outdoor water heater / heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply / heating device installed outdoors.
[0002]
[Prior art]
Conventionally, in outdoor hot water supply and heating systems, when the temperature of the water supply connection pipe that connects the water pipe and the main body of the hot water supply and heating apparatus does not freeze in winter, the temperature near the water supply connection pipe falls below the temperature at which there is a risk of freezing. The freeze prevention operation was performed by energizing and heating the electric heating type antifreezing heater attached to the water supply connecting pipe itself.
[0003]
[Problems to be solved by the invention]
However, in this conventional system, when the hot water heater is installed outdoors in a warm area, when the heating operation is performed in winter, the frame is connected to the water supply by heat dissipation from the burner section itself or from the heating pipe due to combustion of the burner section. The tube's ambient temperature also rises a little, so it has a certain degree of antifreezing effect, and it is possible to use an electric type antifreeze heater that does not generate a large amount of heat, but if you are going to install it outdoors in an extremely cold region In addition, since the outside air temperature in winter is very low, it may be necessary to energize the electric type anti-freezing heater during heating operation, and the electric type anti-freezing heater must have a large calorific value, There was a concern that the power consumption in winter would become very large.
[0004]
In addition, there is a problem that the electric heating type anti-freezing heater cannot generate heat at the time of a power failure and cannot prevent freezing until the power failure is restored, and the piping may freeze and the hot water supply operation may be disabled. It was.
[0005]
[Means for Solving the Problems]
Therefore, the present invention pays attention to this point, and in order to solve the above disadvantages, in particular, the configuration is configured by dividing the frame body installed outdoors into a main body box portion and a piping box portion, and in the main body box portion, A hot water heater / heater main body including a burner unit for burning fuel, a hot water supply circuit connected to a heat exchanger for hot water supply, and a heating circuit connected to a heat exchanger for heating is accommodated in the piping box unit. In outdoor installation type hot water supply and heating apparatus provided with a water supply connection pipe for connecting a water pipe and a water supply pipe of the hot water supply circuit, freezing prevention for allowing a part or all of the heat medium of the heating circuit to circulate in the piping box part and use the tank, and a heating expansion tank to absorb the expansion of the heat medium in the heating circuit is provided, and to perform anti-freezing of the pipe in the pipe box portion by the radiation of the heating expansion tank and the antifreezing tank Than it is.
[0006]
As a result, part or all of the heat medium flowing through the heating circuit is caused to flow into the antifreezing tank, and the atmosphere temperature in the piping box portion is increased by heat radiation from the antifreezing tank, thereby preventing the water supply connection pipe from being frozen. The electric heating type anti-freezing heater is not required and power consumption can be greatly reduced, and the anti-freezing operation by disconnection of the anti-freezing heater cannot be performed because the freezing prevention can be performed if the hot water heater is operable. Problems can also be avoided.
[0007]
In addition, since the heat medium is stored in the anti-freezing tank even after the heating operation is stopped, freezing can be prevented by natural heat dissipation of the stored heat medium for a while after the stop, and power is not consumed. Freezing can be prevented, and the time until freezing in the event of a power failure can be greatly extended.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Next, the outdoor installation type hot water supply and heating apparatus according to the present invention will be described based on an embodiment shown in the drawings.
Reference numeral 1 denotes a frame of an outdoor-installed hot water heater / heater. This frame 1 has a main body box 2 in which a hot water heater / heater main body is housed, and a water supply connection for connecting a water pipe (not shown) and the hot water heater / heater main body. The pipe 3, the heating pipe 4, and the pipe box part 6 containing the bath pipe 5 are arranged vertically, and the main body box part 2 and the pipe box part 6 are both insulated on the inner surface (not shown). A heat insulation structure for winter measures.
[0009]
Reference numeral 7 denotes a heating can body constituting a heating heat exchanger in which a combustion chamber 9 having a heating burner section 8 at the lower portion is formed. An indirect heating type hot water supply heat exchanger is disposed inside the can body 7. A hot water supply snake pipe 10 and a bath snake pipe 11 constituting an indirect heating-type heat exchanger for bathing are arranged vertically so that hot water heating can be performed and hot water and bathing can be performed simultaneously or independently. It is a thing.
[0010]
First, the heating circuit A will be described. 12 is a heating forward pipe, 13 is a heating return pipe, 14 is a circulation pump for heating, 15 is a gas-liquid separator, 16 is connected to the heating return pipe 13 and is in the piping box section 6. An expansion tank for heating that absorbs expansion of the heat medium in the heating circuit A disposed in the heating circuit, 17 is a heating bypass pipe provided with an on-off valve 18, and 19 is a can body temperature sensor used for temperature control of the heating can body 7. The heating medium heated to the control target temperature (about 60 ° C. to 85 ° C.) of the can body temperature sensor 19 by the combustion of the burner section 8 in the heating can body 7 is heated by the heating circulation pump 14. 12 is sent to a heating radiator (not shown) via 12 to perform heating, and low-temperature water (about 30 ° C. to 50 ° C.) radiated by the heating radiator is heated via a heating return pipe 13. Return to body 7 and reheat to control target temperature and circulate Is shall.
[0011]
Next, the hot water supply circuit B will be described. 20 is a water supply pipe connected to the water supply connection pipe 3, 21 is a flow rate sensor for detecting the flow rate of water, 22 is a hot water supply pipe for discharging hot water heated by the hot water supply serpentine pipe 10. , 23 is connected to the hot water supply pipe 22 through the mixing valve 24 and communicates with the hot water supply pipe 20 and the hot water supply pipe 22, and 25 is used for hot water supply to absorb thermal expansion when the hot water tap (not shown) is closed. The expansion tank, 26 is a feed water temperature sensor, and 27 is a hot water temperature sensor. When the hot water tap is opened and the flow rate sensor 21 detects the minimum operating flow rate, the temperature of the heat medium in the heating can 7 is about 80 ° C. Combustion is performed in the burner unit 8 so as to maintain a high temperature, and the cold water from the water supply pipe 20 is indirectly heated by the high-temperature heat medium in the heating can 7 in the hot water supply serpentine pipe 10 and mixed with tap water by the mixing valve 24. Is the water heater adjusted to the proper temperature? It is intended to be hot water supply.
[0012]
Next, the bath circuit C will be described. 28 is a bath outlet pipe, 29 is a bath return pipe, 30 is a bath circulation pump provided in the return pipe 29, 31 is a flow switch for detecting the presence or absence of circulation, and 32 is a bath temperature. When there is a request for boiling of hot water in the bathtub (not shown) by the sensor, the hot water in the bathtub is circulated to the bath snake pipe 11 by the bath circulation pump 30, and the hot water in the bathtub is stored in the heating can 7. The hot water in the bathtub is heated to an appropriate temperature or kept warm by being indirectly heated by a high-temperature heat medium.
[0013]
A hot water supply pipe 33 is branched from the hot water supply pipe 22 of the hot water supply circuit B and connected to the bath circuit C via the hot water supply valve 34 and the three-way valve 35. The bath circuit C and the hot water pipe 33 are switched to communicate with each other, the hot water valve 34 is opened, and the hot water heated by the hot water supply serpentine pipe 11 is flown into the bath circuit C to give a certain amount of hot water to the bath tub. Tensioning.
[0014]
Next, 37 is a communication pipe connecting the upper and lower portions of the heating can body 7, and 38 is a stirring circulation pump provided in the middle of the communication pipe 37. The heating can body 7 is driven during hot water supply or bath operation. The temperature inside is made uniform up and down, and stirring is continued until the hot water supply or bath operation is completed. Since the heating circulation pump 14 is driven during the heating operation, the stirring circulation pump 37 can be prevented from being driven.
[0015]
Reference numeral 38 denotes an antifreezing tank which is disposed in the piping box portion 6 which is a characteristic configuration of the present invention and is formed of a stainless steel tank. A part or all of the heat medium of the heating circuit A is used as the antifreezing tank. 38, the ambient temperature in the pipe box 6 is raised to prevent the water supply connection pipe 3 from freezing. In this embodiment, the antifreezing bypass that communicates the heating forward pipe 12 and the heating return pipe 13 with each other. It is provided in the middle of the tube 39.
[0016]
Next, the operation of one embodiment of the present invention will be described.
First, the heating operation will be described. The can body temperature sensor 19 detects the hot water temperature in the heating can body 7, and when this temperature is a high temperature heating load, it is about 80 ° C., and when the temperature is a low temperature heating load, about 60 ° C. The combustion of the burner unit 8 is controlled so that the heating circulation pump 14 is driven, and the heating medium such as hot water, circulating liquid or antifreeze liquid in the heating can 7 is heated to the heating radiator. Circulation is repeated and returned to the heating can 7 again, and the room is heated by the heating radiator.
[0017]
The high-temperature heat medium sent from the heating can 7 flows from the heating forward pipe 12 to the heating radiator to the heating radiator, and the antifreezing bypass pipe branched from the heating forward pipe 12. The high-temperature heat medium that is diverted from the flow into the anti-freeze bypass pipe 39 flows into the anti-freeze tank 38 and dissipates heat, and the ambient temperature in the pipe box 6 is changed to the cold water in the water supply connection pipe 3. The temperature is raised to a temperature at which there is no risk of freezing to prevent freezing of the water supply connection pipe 3 and the bath pipe 5 and then joins the heating return pipe 13.
[0018]
Here, even if the heating circulation pump 14 is temporarily stopped, the antifreezing tank 38 has a certain capacity, so that the heat medium stored in the antifreezing tank 38 naturally dissipates, and this Freezing is prevented by natural heat dissipation until the temperature of the heat medium is lowered.
[0019]
Therefore, it is possible to prevent freezing without consuming any power by the heat medium stored in the anti-freezing tank 38 even when the heating is temporarily interrupted due to a heating overload state or after the heating operation is stopped. The time until the connection pipe 3 is frozen can be greatly extended, and it is not necessary to take a final measure such as draining even after a power failure of several hours.
[0020]
Moreover, since the expansion tank 16 for heating is also arranged in the piping box unit 6, the expansion heat medium absorbed in the heating expansion tank 16 naturally dissipates during heating operation, and the atmosphere in the piping box unit 6 The temperature is raised to prevent further freezing.
[0021]
Next, in the hot water supply operation, when the heating operation is being performed, the inside of the heating can 7 is already hot, so if the hot water tap is opened, the low-temperature water from the water supply pipe 20 is immediately used for hot water supply. At the same time, the hot water in the lower portion of the can body 7 is driven to the upper portion of the can body 7 via the communication pipe 36 by driving the stirring circulation pump 37 at the same time as being indirectly heated by the high-temperature heat medium in the heating body 7. Supplying and stirring the inside of the heating can body 7 to eliminate the temperature difference between the upper and lower sides in the heating can body 7 so that heat can be always exchanged with the same heat exchange efficiency and hot water having a desired temperature is supplied. It is.
[0022]
At this time, the heat medium which has been used for heating and whose temperature has fallen flows into the heating can 7, and the returned heat medium is about 30 ° C. to 60 ° C. at a relatively high temperature. Since the temperature is sufficiently higher than the low-temperature tap water that flows in when used for heating, the temperature in the can 7 does not drop rapidly, and the necessary amount of heat for hot water supply can be ensured while heating. It can secure hot water at a stable temperature, and can perform direct pressure hot water supply using the water pressure as it is by performing heat exchange for hot water supply with the hot water supply serpentine tube 10 in the heating can 7. is there.
[0023]
Since the heating circulation pump 14 is driven during the heating operation, the temperature difference between the upper and lower sides in the heating can 7 is eliminated to some extent, so that the stirring circulation pump 37 can be prevented from being driven. However, if the circulating pump for stirring 37 is driven, the temperature difference is further eliminated. In addition, during the simultaneous operation of heating and hot water supply, it is possible to improve the heat exchange efficiency in the hot water supply serpentine tube 10 by setting the control target temperature of the heating can 7 higher than that in the single heating operation.
[0024]
Here, a case where the heating operation is not performed before the hot water supply operation will be described. When the user turns on a hot water supply operation switch such as a remote controller (not shown), combustion is started in the burner unit 8 and detected by the can body temperature sensor 19. The temperature of the heating can 7 is heated to a control target temperature of about 85 ° C., the stirring circulation pump 37 is driven, and hot water at the lower portion of the can 7 is supplied to the upper portion of the can 7 through the communication pipe 36. The heating can body 7 is agitated to eliminate the temperature difference between the upper and lower portions of the heating can body 7 so that the heat exchange can always be performed with the same heat exchange efficiency, and the system waits until the hot water tap is opened.
[0025]
When the hot water tap is opened, the cold water from the city water that has passed through the hot water supply serpentine tube 10 is indirectly heated by the heat medium in the heating can 7 maintained at a high temperature, and hot water having a desired temperature is supplied. Is. If the hot water is not supplied again within a certain time (for example, 4 hours) from the end of hot water supply during an unnecessary period of heating operation such as summer, the hot water supply operation switch is automatically turned off to It is also possible to release the holding state at the control target temperature of the can 7 and to save energy.
[0026]
Next, in the bath operation, when there is a request for boiling the hot water in the bathtub, such as turning on a bath heat switch of a remote controller (not shown), the bath circulation pump 30 is driven to supply the hot water in the bathtub to the bath serpentine tube 11. It is circulated and heated with a heat medium in the heating can 7 that is kept at a high temperature to recharge or keep the hot water in the bathtub at a desired temperature. It is automatically stopped when it is detected.
[0027]
At this time, as in the hot water supply operation, a relatively high temperature heat medium is returned to the heating can body 7, so that the temperature in the can body 7 is not drastically decreased and heating is performed. While ensuring the necessary amount of heat for the bath, the bath can be reheated or kept warm, and the stirring circulation pump 37 eliminates the temperature difference between the upper and lower sides of the heating can 7 and always keeps the same heat. It is possible to realize bathing where the boiling time does not vary greatly due to the exchange efficiency.
[0028]
In the case of simultaneous operation of hot water supply and bath, as in the case of single operation of hot water supply, if the heating can body 7 is temperature-controlled without driving the heating circulation pump 14, the above hot water supply operation and bath operation are performed simultaneously. Well, in the case of simultaneous operation of hot water supply, bath and heating, it is possible to control the hot water supply temperature and the bath temperature at the same time as in the simultaneous operation of hot water supply and heating or the simultaneous operation of bath and heating.
[0029]
Here, the amount of combustion in the burner unit 8 is obtained by the sum of the necessary heat amount used for heating, the necessary heat amount used for hot water supply, and the necessary heat amount used for bath, for example, when heating water is used alone. Feedback required heat amount based on the output of the can body temperature sensor 19 and the can body control target temperature so as to keep the inside of the can body 7 at the control target temperature, and a feedforward required heat amount calculated by the hot water supply set temperature, the feed water temperature, and the total flow rate, The combustion amount is determined according to the above.
[0030]
Thus, by using the can 7 directly heated by the combustion of the burner portion 8 for heating, the temperature of the heat medium flowing into the can 7 after being used for heating is relatively high. 7 is not drastically decreased, and the necessary amount of heat can be reliably supplied to each other during simultaneous operation of heating and hot water supply, and the hot water supply circuit B is a direct pressure type. It is easy to use and can easily maintain the pressure required when used for heating, and stable heating and hot water supply operations can be performed at any time, and by using the can 7 for heating, a heating medium for heating The capacity can be increased, and even if a large number of radiators for heating are connected, it is possible to reliably cope with it and the convenience is greatly improved.
[0031]
The present invention is not limited to this embodiment. For example, in this embodiment, the antifreezing tank 38 is provided with a heating radiator between the heating forward pipe 12 and the heating return pipe 13 of the heating circuit A. A bypass valve may be provided in parallel, but a switching valve may be provided to switch the heat medium flowing in the heating circuit A so that it flows only to the anti-freezing tank 38 without flowing to the heating radiator. When the temperature sensor provided in the piping box section 6 detects that the temperature is below the freezing risk temperature, the burner section 8 is automatically started to start the heating operation and the switching valve is set to the anti-freezing tank 38. It is also possible to switch to the side so that only freezing prevention is performed.
[0032]
Further, for example, it may be connected in series to the heating forward pipe 12 or the heating return pipe 13, and the anti-freezing tank 38 may be provided with fins for improving heat dissipation.
[0033]
Further, as one embodiment, a one-can three-circuit type hot water supply / air heating apparatus in which the heat exchanger for heating is the can 7 and the heat exchanger for hot water supply is the serpentine tube 10 has been described. And a heat exchanger for heating can be a two-can two-circuit type hot-water supply / heater with a dedicated burner, and the heat exchanger can be configured as a hot water storage can type, fin tube type, or indirect heating type. It is.
[0034]
In short, the gist of the present invention is to provide the anti-freezing tank 38 and does not prevent the provision of the electrothermal anti-freezing heater. In other words, by providing the anti-freezing tank 38, it is only necessary to adopt an electrothermal anti-freezing heater having a small calorific value even in an extremely cold region, which can greatly reduce power consumption. is there.
[0035]
【The invention's effect】
As described above, according to the present invention, during heating operation, a part or all of the heat medium flowing through the heating circuit is caused to flow to the antifreezing tank, and the heat medium also flows to the heating expansion tank . Since the water supply connection pipe in the piping box is prevented from freezing by raising the ambient temperature, the electric heating type anti-freezing heater is unnecessary or may be one with a small calorific value. Since the heat medium is still stored in the freezing prevention tank and the heating expansion tank even after the stop, the power is not consumed for a while after the stop, and the stored heat medium is naturally dissipated, resulting in a temporary power failure. Even if it exists, it can prevent freezing.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic configuration diagram of an outdoor installation type hot water supply and heating apparatus with an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Frame 2 Main body box part 3 Water supply connection pipe 6 Piping box part 7 Heating can (Heating heat exchanger)
8 Burner section 10 Hot water supply serpentine (heat exchanger for hot water supply)
20 Water supply pipe 38 Antifreeze tank 39 Antifreeze bypass pipe A Heating circuit B Hot water supply circuit

Claims (2)

A frame installed outdoors is divided into a main body box portion and a piping box portion, and a burner portion for burning fuel, a hot water supply circuit connected to a heat exchanger for hot water supply, and heating An outdoor installation type hot water supply having a hot water supply and heating apparatus main body provided with a heating circuit connected to a heat exchanger and having a water supply connection pipe for connecting a water pipe and a water supply pipe of the hot water supply circuit in the piping box portion In the heating device, an antifreezing tank that circulates a part or all of the heating medium of the heating circuit in the piping box part, and a heating expansion tank that absorbs expansion of the heating medium in the heating circuit are provided, An outdoor-installed hot-water supply and heating device characterized in that the piping in the piping box is prevented from freezing by radiating heat from the anti-freezing tank and the heating expansion tank . 2. The outdoor-installed hot water heater according to claim 1, wherein the anti-freezing tank is provided in the middle of the anti-freezing bypass pipe connecting the heating forward pipe and the heating return pipe of the heating circuit.

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