JP3487101B2 - Hot water heating system - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heating apparatus, and more particularly to a hot water heating apparatus having a bath reheating function. [0002] Conventionally, as a hot water heating device having a heating function and a bath reheating function, a hot water reheating device has
There has been a type in which heat is exchanged between the circulation channel for heating and the circulation channel for post-heating to increase the temperature of the hot water in the circulation channel for post-heating, thereby performing reheating. In such a type of hot water heating apparatus, hot water in a bathtub is circulated in a circulation path for reheating the bath, the hot water in the bathtub is sent to a heat exchange unit, and returned to the bathtub through the heat exchange unit. At the same time, the hot water on the heating function side is also sent to the heat exchange section and circulated, and the heat exchange section exchanges heat between the hot water on the heating function side and the hot water on the bath side to raise the temperature of the hot water in the bathtub on the bath side. I try to make it. [0004] Although such a hot water heating apparatus is conventionally provided, the conventional apparatus has the following problems during the freeze prevention operation. First, a general freeze prevention operation will be described. If the outside air temperature or the temperature in the heating pipe is considerably reduced, the freeze prevention operation is performed because there is a possibility of freezing. This prevents freezing by flowing warm water into the heating pipe to warm it. If there is residual water in the bathtub during the operation of freezing prevention, the natural heat circulates heat from the hot water for freezing prevention by the heat exchange unit, which hinders sufficient freezing prevention. Problem arises. Therefore, the present invention has been made in view of the above-mentioned problems, and in consideration of the urgency of freezing prevention, it is possible to appropriately prevent freezing without these problems during the antifreezing operation. An object of the present invention is to provide a hot water heating device that can be performed. [0007] In order to achieve the above object, the invention according to claim 1 has a heating function for heating by flowing hot water through a heating pipe, and a bath reheating function. At the time of bath reheating, the hot water flowing through the heating pipe is taken out and circulated, and heat exchange is performed by a heat exchanger between the heating tap pipe and the bath reheating circulation channel, so that the hot water in the bath reheating circulation channel is heated. A heating water combustor for heating hot water in the heating pipe, a heating circulation pump for circulating hot water in the heating pipe, and flowing through the heat exchanger. A valve for opening and closing the flow path of the heating tapping pipe, and a residual water detecting means for detecting the presence or absence of residual water in the bathtub, and driving the heating circulation pump at a low temperature to flow hot water to the hot water heating pipe. Freezing by Antifreezing control means for preventing, and valve control means for closing the valve and prohibiting the opening operation when residual water is detected in the bathtub by the residual water detecting means during the antifreezing operation by the antifreezing control means. It is characterized by. According to the first aspect of the present invention, when the freezing prevention operation on the heating side is performed in a state where there is residual water in the bathtub, the flow of the hot water on the heating side flowing to the heat exchanger is controlled by closing the valve. Since the opening operation is prohibited until the freeze prevention operation is completed, the temperature of the hot water for preventing freezing is prevented from being lowered by heat exchange with hot water flowing through the reheating circuit of the bathtub. Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a hot water heating apparatus according to the present invention. The apparatus has respective functions of hot water supply, heating, and post-bath heating. The apparatus includes a hot water supply combustor 1 and a heating combustor 2, and a hot water supply canister 4 forming a hot water supply combustion chamber 3 of the hot water supply combustor 1 includes a hot water supply burner 5. And a heat exchanger 6 for hot water supply. The hot water supply burner 5 is located below the hot water supply heat exchanger 6, and is supplied with fuel gas such as city gas or propane gas through a hot water supply gas pipe 7. The hot water supply gas pipe 7 is provided with a hot water supply proportional valve 8 that varies the amount of fuel gas supplied to the hot water supply burner 5. A hot water supply pipe 9 and a hot water supply pipe 10 are connected to the hot water supply heat exchanger 6. Water such as tap water supplied to the hot water supply heat exchanger 6 via the hot water supply pipe 9 is connected to the hot water supply pipe 9. Is heated by the flame of the hot water supply combustion chamber 3 while passing through the hot water supply heat exchanger 6, and is supplied to a predetermined hot water supply point such as a kitchen or a bathtub 11 via the hot water supply pipe 10. The hot water supply pipe 9 includes a hot water supply quantity detector 12 including a water quantity sensor for detecting the quantity of water supplied to the hot water supply heat exchanger 6, and a temperature thermistor for detecting the temperature of water supplied to the hot water supply heat exchanger 6. A hot water supply temperature detector 13 composed of a hot water supply and the like is installed.
A hot water supply temperature detector 14 including a temperature thermistor for detecting the temperature of hot water from the hot water supply heat exchanger 6 is provided. At the lower end of the hot water supply can 4, a hot water supply fan 15 such as a sirocco fan for blowing combustion air into the hot water supply combustion chamber 3 is installed. Is driven to rotate by a hot water supply fan motor 16. Inside a heating can 22 forming a heating combustion chamber 21 of the heating combustor 2, a heating burner 23,
A heating heat exchanger 24 is provided. The heating burner 23 is located below the heating heat exchanger 24, and is supplied with fuel gas such as city gas or propane gas via a heating gas pipe 25. The heating burner 23 has a smaller combustion capacity than the hot water supply burner 5. Heating gas pipe 2
5 is provided with a heating proportional valve 26 for varying the amount of fuel gas supplied to the heating burner 23. The heating heat exchanger 24 is interposed in the heating circulation flow path 27, and the heating circulation water flow path 27 further includes the heating hot water tank 2.
8 are interposed. The heating circulation channel 27 includes a heating water inlet pipe 29 extending from the heating hot water tank 28 to the heating heat exchanger 24, and a heating outlet pipe 30 extending from the heating heat exchanger 24 to the heating hot water tank 28. The heating water inlet pipe 29 is provided with a heating circulation pump 31 for circulating hot water in the heating hot water tank 28 through the heating circulation flow path 27 and the like. 30
Is provided with a heat exchanger 32 for post-bath heating.
One end of a low-temperature heating pipe 33 is connected to the heating water inlet pipe 29 at a position between the heating circulation pump 31 and the heating heat exchanger 24, and the heating heat pipe 30 is connected to the heating hot water pipe 30. One end of the high-temperature heating pipe 34 is connected to a position between the exchanger 24 and the bath reheating heat exchanger 32, and between the bath reheating heat exchanger 32 and the heating hot water tank 28. One end of the heating return pipe 35 is connected to the position. The other end of the low-temperature heating pipe 33 is connected to a heating return pipe 35 via a heating device main body such as a panel heater or a fan heater (not shown). The other end is connected to the heating return pipe 35 via the heating device main body. The heating water inlet pipe 29 has a heating heat exchanger 2
A heating water flow rate detector 36 including a water flow rate sensor and the like for detecting the water flow rate into the fuel cell 4 is provided. Hot water supply pipe 30
In a position between the connection point of the heating heat exchanger 24 and the high-temperature heating pipe 34, a heating tap temperature detector 37 such as a temperature thermistor for detecting the tap temperature from the heating heat exchanger 24 is provided. Is installed, and a heating thermal valve 38 for opening and closing the heating circulation flow path 27 is installed at a position between the connection point of the bath reheating heat exchanger 32 and the heating return pipe 35, Connection point of heating return interval 35 and heating hot water tank 28
A heating incoming water temperature detector 39 composed of a temperature thermistor or the like for detecting the temperature is installed at a position between the two. The bath reheating heat exchanger 32 is interposed in a bath reheating circulation channel 41. The bath reheating circulation channel 41 is provided from the bathtub 11. And a bath outflow pipe 43 from the heat exchanger for bath heating 32 to the bathtub 11. The bath return pipe 42 is provided with a bath circulation pump 44 that circulates the hot water in the bathtub 11 through the bath additional heating circulation channel 41.
One end of a bath hot water supply pipe 46 that forms a bath hot water supply passage 45 is connected to a position between 4 and the bath post-heating heat exchanger 32. The other end of bath water pipe 46 is connected to hot water tap 10. At the lower end of the heating can 22, a heating fan 51 such as a sirocco fan for blowing the combustion air into the heating combustion chamber 21 is installed. Is driven to rotate by a heating fan motor 52. The heating gas pipe 25 has an electromagnetic on-off valve 5 for opening and closing a gas supply flow path to the heating burner 23.
3 are installed. In addition, an electromagnetic opening / closing valve 54 that opens and closes the bath hot water supply passage 45 is installed in the bath hot water supply pipe 46. One end of a heating bypass pipe 55 is connected to the high-temperature heating pipe 34, and the other end of the heating bypass pipe 55 is connected to a heating valve 38 of the heating tapping pipe 30 and a heating hot water tank. 28.
That is, the high-temperature heating pipe 34 and the heating bypass pipe 55
Thus, a heating bypass channel 56 that bypasses the portion of the heat exchanger 32 for reheating the bath of the hot water supply pipe 30 is formed. Next, the operation will be described. For example, when a user performs a command for bath reheating with respect to the remote controller 70, the remote controller 70 outputs a bath reheating command signal to the control device 60. As a result, the control device 60 burns the heating burner 23, opens the heating thermal valve 38, and drives the heating circulation pump 31 and the bath circulation pump 44. As a result, the hot and cold water in the heating hot water tank 28 is
7 and the hot and cold water in the bathtub 11 circulates in the circulation channel 41 for bath reheating. That is, the heating circulation pump 31 causes the heating hot water tank 28 to move from the heating inlet pipe 29
The hot and cold water supplied to the heating heat exchanger 24 via the heating heat exchanger 24 is heated by the flame of the heating combustion chamber 21 while passing through the heating heat exchanger 24, and is heated via the heating hot water pipe 30. Return to 28. On the other hand, the hot and cold water supplied from the bathtub 11 by the bath circulation pump 44 to the bath post-heating heat exchanger 32 via the bath return pipe 42 passes through the bath post-heating heat exchanger 32 while being supplied to the heating tapping pipe. The water is heated by, for example, hot water of about 80 degrees Celsius within 30, and returns to bathtub 11 through bath pipe 43. As a result, the temperature of the hot and cold water in the bathtub 11 gradually increases. When the user performs a high-temperature heating command operation on the remote controller 70 or the control device 60, the control device 60 burns the heating burner 23 and sets the high-temperature heating pipe 34 in the high-temperature heating pipe 34. The outside valve is opened, and the heating circulation pump 31 is driven. Thereby, the hot and cold water in the heating hot water tank 28 is circulated through the high-temperature heating circulation flow path including the heating water inlet pipe 29, the high-temperature heating pipe 34, the heating return pipe 35, and a part of the heating hot-water pipe 30. I do. At this time, since the heating heat valve 38 is closed, the hot water in the heating hot water tank 28 does not flow through the portion of the heating water discharge pipe 30 through the bath reheating heat exchanger 32.
That is, the heating circulating pump 31 transfers the heating heat exchanger 2 from the heating hot water tank 28 through the heating inlet pipe 29.
The hot and cold water supplied to the heating device 4 is heated by the flame of the heating combustion chamber 21 while passing through the heating heat exchanger 24, and the heating device main body such as the high-temperature heating pipe 34 and the underfloor radiating pipe and the heating return pipe 35 are provided. The heating water returns to the heating hot water tank 28 via the heating water supply pipe 30 and a part of the heating hot water pipe 30. At this time, heat is radiated while passing through the heating device main body such as the underfloor radiating pipe, and underfloor heating is performed. Eventually, the underfloor heating is performed by the hot water of about 80 degrees Celsius passing through the underfloor radiating pipe. Of course, in addition to the above-mentioned valve installed in the high-temperature heating pipe 34, a valve is also installed on the heating device main body side, and the opening and closing of these valves allows accurate adjustment of the room temperature. When a user performs a low-temperature heating command operation on the remote controller 70 or the control device 60, the control device 60 burns the heating burner 23, and the heating thermal valve 38 and the low-temperature heating valve 38. A valve (not shown) provided in the pipe 33 is opened to drive the circulation pump 31 for heating. As a result, the hot and cold water in the heating hot water tank 28 circulates in the heating circulation channel 27, and at the same time, a part of the heating water inlet pipe 29, the low-temperature heating pipe 33, the heating return pipe 35, and the heating hot water pipe 30. Circulates through a circulation flow path consisting of At this time, since the valve on the heating device main body side installed in the high-temperature heating pipe 34 is closed,
Hot water in the heating hot water tank 28 does not flow through the high-temperature heating pipe 34. That is, part of the hot and cold water flowing from the heating hot water tank 28 into the heating water inlet pipe 29 by the heating circulation pump 31 flows into the low temperature heating pipe 33, and the remainder is supplied to the heating heat exchanger 24. Heat exchanger 24 for heating
Is heated by the flame of the heating combustion chamber 21 and returns to the heating hot water tank 28 via the heating hot water pipe 30. On the other hand, the hot and cold water flowing into the low temperature heating pipe 33 returns to the heating hot water tank 28 through the heating device main body such as the panel heater and the fan heater, the heating return pipe 35 and a part of the heating hot water pipe 30. At this time, heat is dissipated while passing through a heating device body such as the panel heater or the fan heater to perform heating. Eventually, the hot water in the heating hot water tank 28 is heated by the heating burner 23 while circulating in the heating circulation flow path 27, and the hot water circulates through the heating device main body. The heating will be performed. Of course, the heating pipe 33 for low temperature
In addition to the above-mentioned valves installed in the heater, valves are also installed on the heating device main body side, and the opening and closing of these valves allows accurate adjustment of the room temperature. Next, an outline of a control configuration of the hot water heating apparatus of the present invention will be described with reference to FIG. The entire hot water heating apparatus is controlled by the control device 60. The control device 60 includes a microcomputer and the like, and based on signals from various sensors such as a remote controller 70 and temperature sensors 37 and 39, the heating thermal valve 3
8. Drive control of various drive units such as the circulation pumps 31 and 44. Specifically, the control device 60 includes a hot water heating control unit 61, a hot water supply control unit 62, a flow control unit 63, a residual water detection unit 64, an anti-freezing unit 65, and a heating thermal valve control unit 6.
6 and other control means 67. The hot water heating control means 61 controls the temperature, flow rate, etc. of the hot water flowing from the high-temperature heating pipe 34 to a high-temperature heating device such as floor heating, based on the values detected by the remote controller 70 and various sensors. Heating pipe for low temperature 3
This is a means for controlling the temperature, flow rate, and the like of the hot water flowing out from 3 to a low-temperature heating device such as a panel heater. The hot water supply control means 62 is a means for controlling the supply of hot water to a kitchen, a washroom, or the like. The flow control means 63 controls the operation of dropping the hot water into the bathtub based on the detection values of the remote controller 70 and various sensors, and furthermore, when the temperature of the hot water in the bathtub becomes low or when the bather increases the temperature. This is a means for controlling the reheating operation when desired. Residual water detection means 64
Is a means for detecting the presence or absence of residual water in the bathtub, for example, based on a detection value of a water level sensor provided near the circulation port of the bathtub, and a water flow switch 47 provided in the circulation channel 41 for bath reheating. When the circulating pump 44 is driven, it can be determined by turning on / off the switch. The freezing prevention control means 65 is means for controlling the operation of preventing freezing by flowing hot water or activating a heater (not shown) when the outside air temperature is considerably lowered and the possibility of freezing occurs. . Heating valve operating means 66 for heating
Is for controlling the heating heat valve 38, particularly when the freezing prevention control means 65 is performing a freezing prevention operation on the heating side, and the remaining water detection means 64 is used to control the inside of the bathtub.
If the presence of residual water is detected , the heating thermal valve 38
The opening operation of is prohibited. Although the valve 38 is a thermal valve, any other valve may be used as long as it can be opened and closed. The heating thermal valve 38 corresponds to valve control means. The other control means 67 performs control other than the above, and performs, for example, detection control of various sensors and transmission control with the remote controller 70. Next, the operation for preventing freezing will be described.
First, the freezing prevention operation on the flow side will be described with reference to the flowchart of FIG. 3. The freezing prevention control unit 65 determines whether the freezing prevention operation on the flow side is necessary (step S1). This is determined based on whether or not a temperature sensor (not shown) provided in the flow side pipe detects a predetermined temperature (for example, 5 ° C.) or less. If it is determined that it is necessary (step S2), the remaining water detecting means 64 detects the presence or absence of remaining water.
The remaining water is detected by determining whether or not the recirculation pump 44 is driven to turn on the water flow switch 47 (steps S3 and S4). If the water flow switch 47 is turned on within a predetermined time after the reheating pump 44 is driven, it is determined that there is residual water in the bathtub, and the freezing prevention operation on the flow side is performed using the residual water. If the heating heat valve 38 is closed, an opening operation is performed (step S5), and the temperature is raised by heating the hot and cold water circulating in the bath reheating circulation channel 41 with the heat exchanger 32 for 10 minutes, for example, to freeze the water. Prevention (step S6).
After the freezing prevention operation has been performed for a predetermined time, the circulation pump 44 is turned off, and the heating thermal valve 38 is closed, and the process ends (step S7). If there is no remaining water in the bathtub if the water flow switch 47 is not turned on even after a predetermined time has elapsed after driving the circulation pump 44 in step S4, the freezing is prevented by heating the heater for a predetermined time (steps S9 and S1).
0). The heater is not shown, but is attached to the circulation channel 41 for post-bath heating. Next, the operation of preventing freezing on the heating side will be described with reference to the flowchart of FIG. First, the anti-freezing control means 65 determines whether or not the heating side needs an anti-freezing operation (steps S11 and S12 ). This is determined based on whether or not a temperature sensor (not shown) provided near the piping on the heating side has detected a predetermined temperature (for example, 5 ° C.) or less.
If it is determined that it is necessary, the residual water detecting means 64 determines whether there is residual water in the bathtub (step S13). The presence or absence of the residual water can be performed by, for example, the same operation as steps S3 and S4 in FIG. If it is determined that there is residual water, the heating thermal valve 38 is closed (steps S14 and S15). This is because even when the heating valve 38 is opened to provide hot water for freezing prevention in a state where there is residual water in the bathtub, if the above-mentioned freezing prevention operation is performed on the flow side during the operation, the heat This is because the heat of hot water for preventing freezing on the heating side is taken away by the exchanger 32, and freezing on the heating side is not sufficiently performed. Even if the circulation pump 44 on the front side is not driven, because it is deprived of heat by the heat exchanger 32 by a bath reheating circulation passage natural circulation, since the antifreezing the heating side is eliminated sufficiently performed, for heating It is important to prohibit the opening operation of the thermal valve 38. Next, the heating circulation pump 34 is driven to open the thermal valve of the terminal of the heating device to supply hot water to each heating device and to burn the heating combustor 2 (step S16, S17). Until the temperature sensor for preventing freezing detects a predetermined temperature (for example, 20 ° C.)
The operations of steps S16 to S17 are performed, and when the temperature reaches a predetermined temperature (step S18), the combustion of the heating combustion device 2 is stopped (step S19), and the heating circulating pump 31 is stopped after circulating hot water for 5 minutes. At the same time, the thermal valve of the terminal of each heating device is closed to stop the supply of hot water (step S
20, S21, S22). At the same time, the heating thermal valve control means 66 releases the closed state of the heating thermal valve 38 (step S22). The opening operation is permitted according to another operation. This ends the heating-side freezing prevention operation. When the freezing prevention operation on the flow side is required during the freezing prevention operation on the heating side, the heating thermal valve 3
The remaining water in the bath tub is circulated or the heater is heated while 8 is closed. Then, after the freezing prevention operation on the heating side is completed, if there is residual water, the residual water is circulated while being heated by the heat exchanger 32. This is because the piping on the heating side is usually longer and the need to prevent freezing is higher. Further, the flow side can execute a temporary freezing prevention operation by the above operation. As described above, according to the present invention, when the freezing prevention operation on the heating side is performed in a state where the bathtub has hot water, the flow of the heating-side hot water flowing to the heat exchanger side is controlled by the valve. Since the opening operation is prohibited until the freeze prevention operation is completed, the temperature of the hot water for freezing prevention is reduced by heat exchange with the hot water flowing through the reheating circulation channel of the bathtub. Thus, there is an effect that proper freezing prevention operation can be ensured.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating a configuration of a hot water heating device. FIG. 2 is an explanatory diagram of a control configuration according to the present invention. FIG. 3 is a flowchart showing a freezing prevention operation on the flow side. FIG. 4 is a flowchart showing a freezing prevention operation on the heating side. [Description of Signs] 1 Hot water supply combustor 2 Heating combustor 11 Bath tub 27 Heating circulation flow path 28 Heating hot water tank 29 Heating water inlet pipe 30 Heating tap water pipe 31 Heating circulation pump 32 Heat exchange for bath reheating Vessel 41 bath recirculation circulation channel 60 controller 70 remote controller

Claims (1)

(57) [Claims] [Claim 1] It has a heating function of performing heating by flowing hot water through a heating pipe, and a bath reheating function. At the time of bath reheating, hot water flowing through the heating pipe is supplied. A hot water heating device that raises the temperature of hot and cold water in a bath reheating circulation channel by performing heat exchange with a heat exchanger between a heating tapping pipe to be taken out and circulated and a bath reheating circulation channel, wherein the heating is performed. A heating combustor for heating the hot and cold water of the piping,
A heating circulation pump that circulates the hot water in the heating pipe, a valve that opens and closes a flow path of the heating tapping pipe that flows through the heat exchanger, and a residual water detection unit that detects presence or absence of residual water in the bathtub. The anti-freezing control means for preventing freezing by driving the heating circulation pump at a low temperature to flow hot water through the hot water heating pipe, and the residual water detecting means during the anti-freezing operation by the anti-freezing control means Valve heating means for closing the valve and prohibiting the opening operation when residual water is detected in the bathtub.