JPH06249508A - Circulation and heat insulation type hot water supply device - Google Patents

Abstract

PURPOSE:To efficiently operate a circulation pump and to control the start and stop of the operation of a circulation pump so as to properly maintain the temperature of a hot water in a circulation line. CONSTITUTION:A hot water supply device 1 includes a circulation line 8 having a water supply line 3, a heat exchanger 4, a hot water line 5 and a return line 6 provided with a circulation pump 7 and achieves a heat insulation by circulating and heating a hot water in the circulation line 8. A means for deciding the start of a circulation based on the respectively detected temperatures of an inlet side temperature sensor, an outlet side temperature sensor and an outside air temperature sensor is provided. A means for removing the influence of temperature fluctuation due to an intermittent combustion and deciding the stop of circulation and a means for controlling the operation of the circulation pump 7 based on the decided outputs of respective deciding means are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulating and warming type hot water supply apparatus, and in particular, by appropriately controlling the operation / stop of a circulation pump for circulating the hot water in the circulation pipeline, the hot water in the circulation pipeline is controlled. The present invention relates to a hot water supply device that keeps temperature within a predetermined range.

[0002]

2. Description of the Related Art A circulation line is formed by connecting a terminal side of a hot water supply line and a water inlet side of a heat exchanger with a return line, and a circulation pump provided in the return line or the like is operated to operate in the circulation line. While circulating hot water, the temperature sensor installed in the appropriate place in the circulation path detects the temperature of the hot water in the circulation path. If the detected hot water temperature is lower than the set temperature, heat it with a heat exchanger to set the temperature. When the temperature reaches a certain level, the hot water in the circulation path is kept at an appropriate temperature, and the hot water supply with a suitable temperature can be quickly discharged from the hot water tap connected to the hot water supply pipeline. Fairness 3-28
It is known from Japanese Patent No. 664.

[0003]

In the conventional hot water supply apparatus, when circulation warming operation is required, the circulation pump is constantly operated in a state where hot water is not discharged from the hot water tap, and the hot water in the circulation pipe is removed. It was circulating. However, if the hot water is circulated while the heating in the heat exchanger is stopped, the temperature of the hot water will decrease due to heat dissipation in the heat exchanger. Moreover, the electric power for operating the circulation pump was wasted. Therefore, it has been desired to control the operation / stop of the circulation pump under appropriate conditions.

On the other hand, the circulation flow rate generated by the operation of the circulation pump is a small flow rate of about several liters per minute, and the heat retention for raising the temperature of about several degrees is prevented so that the temperature of the hot water in the circulation pipe is not significantly lowered. Since heating is performed, the amount of heat required for heat retention heating is relatively small. Therefore, intermittent combustion control is performed in which the gas on-off valve is opened and closed with the opening of the gas proportional valve being minimized. Therefore, the temperature of the hot water in the circulation pipe pulsates in the circulation heating state. Therefore, if the temperature sensor detects the temperature of the hot and cold water in the circulation pipe and the heating is stopped and the operation of the circulation pump is stopped when the temperature reaches a predetermined temperature, the peak portion of the pulsating temperature is detected. Circulation heating is stopped. Therefore, the average temperature of the hot water in the circulation pipe cannot be raised to a predetermined temperature, and the hot water outlet temperature from the hot water tap may decrease.

Further, when the operation of the circulation pump is stopped, the degree of temperature decrease of the hot and cold water in the circulation conduit differs depending on the condition of the piping. Therefore, there is a problem in which position of the circulation pipe the temperature of the hot water is detected and the operation of the circulation pump is started. When a temperature sensor for detecting the temperature of the hot water is provided in the hot water supply pipe near the hot water outlet side of the heat exchanger, the temperature of the hot water at this position has not decreased so much due to residual heat of the heat exchanger, but In some cases, the temperature of hot water may have dropped significantly. If a temperature sensor is installed on the water inlet side of the heat exchanger, the hot and cold water temperature at this position will drop significantly due to the water on the water supply pipe side, but the hot and cold water temperature in the hot water supply pipe and return pipe will not be so low. Sometimes it doesn't. When the return pipe is located outdoors, it is expected that the temperature of hot water in the outdoor area will drop significantly in winter. However, temperature sensors are installed at multiple points in the circulation pipeline to detect the temperature distribution in the circulation pipeline, and if even part of the temperature is low, start the operation of the circulation pump and It is uneconomical to make the temperature of the hot and cold water uniform and to keep it warm by a heat exchanger as needed.

The present invention has been made to solve such a problem. A first object is to keep the average temperature above a predetermined temperature even if the hot and cold water temperature in the circulation pipe pulsates due to intermittent combustion. Is to provide a hot-water supply device that ensures continuous circulation heating by continuing the operation of the circulation pump. The second purpose is to change the temperature at which the circulation pump is started depending on the position where the temperature sensor for detecting the temperature of the hot water in the circulation pipe is provided, so that the temperature of the hot water in the circulation pipe is greatly increased. It is an object of the present invention to provide a hot water supply device which can prevent a decrease in temperature and supply a desired hot water temperature at the time of starting hot water discharge from a hot water tap. The third purpose is to circulate even in a place where it is difficult to install a temperature sensor in a pipe section arranged outdoors etc. without directly detecting the temperature of the hot water and before the temperature of the hot water significantly decreases. It is to provide a water heater so that the operation of the pump can be started.

[0007]

In order to achieve the first object, a circulation warming type hot water supply apparatus according to claim 1 connects a terminal end of the hot water supply conduit and a water supply conduit with a return conduit to supply water. Pipeline,
An annular pipe is formed by the heat exchanger, the hot water supply pipe, and the return pipe, and when the hot water tap connected to the hot water supply pipe is not being used, the circulation pump installed in the return pipe is operated. In a device that keeps the hot water temperature in the circulation pipeline within a predetermined temperature range by appropriately performing a circulation heat retention operation in which the hot water is heated in the heat exchanger while circulating the hot water in the circulation pipeline, The circulation stop judging means for judging the operation stop of the circulation pump based on the detection output of the temperature sensor provided at an arbitrary position is provided, and this circulation stop judging means detects the temperature of the hot water in the circulation pipeline detected by the temperature sensor. When the temperature exceeds the set temperature set by the temperature setter, etc., and continues for a predetermined time set sufficiently long for the heating cycle by intermittent combustion, the heating by the heat exchanger is stopped and the circulation pump is operated. Let it stop Characterized by being configured.

In order to achieve the first object, a circulation heat retention type hot water supply device according to a second aspect of the present invention connects a terminal end of the hot water supply pipe and the water supply pipe with a return pipe to provide a water supply pipe and a heat exchanger. In the non-hot water supply state where the hot water supply pipe and the return pipe form an annular pipe and the hot water plug connected to the hot water supply pipe is not used, the circulation pump installed in the return pipe is operated. In a device that keeps the hot water temperature in the circulation pipe within a specified temperature range by appropriately performing a circulation heat retention operation in which the hot water in the pipe is circulated and heated by a heat exchanger, an arbitrary position in the circulation pipe And a circulation stop determination means for determining the operation stop of the circulation pump based on each detection output of the temperature sensor provided in the water supply pipeline in the circulation pipeline. Hot water temperature on the water inlet side of the heat exchanger detected by the temperature sensor Intermittent combustion occurs when the heat retention heating amount obtained by multiplying the temperature difference from the set temperature set by the temperature setting device, etc. by the circulation flow rate detected by the flow sensor is smaller than the preset heat retention heating stop heating amount. It is characterized in that the heating by the heat exchanger is stopped and the operation of the circulation pump is stopped when the heating is continued for a predetermined time set to be sufficiently long for the heating cycle.

In order to achieve the second object, the circulation heat insulation type hot water supply device according to claim 3 connects the end of the hot water supply pipe and the water supply pipe with a return pipe to provide a water supply pipe, a heat exchanger, Hot water supply pipe,
In the non-hot water supply state where the return conduit forms an annular conduit and the hot water tap connected to the hot water supply conduit is not used, the circulation pump installed in the return conduit is operated to remove hot water in the circulation conduit. In a device that keeps the hot water temperature in the circulation pipe within a predetermined temperature range by appropriately performing a circulating heat retention operation that heats the heat exchanger while circulating it, install it in the hot water supply pipe near the outlet side of the heat exchanger. The circulation start judging means for judging the start of operation of the circulation pump based on the hot water temperature detected by the temperature sensor is provided, and this circulation start judging means sets the temperature of the hot water in the hot water supply pipe detected by the temperature sensor to the temperature setting. The operation of the circulation pump is started when the temperature becomes lower than a preset temperature set by a vessel or the like by a preset first temperature difference or more.

In order to achieve the second object, the circulation heat retention type hot water supply device according to claim 4 connects the terminal end of the hot water supply pipe and the water supply pipe with a return pipe to provide a water supply pipe, a heat exchanger, Hot water supply pipe,
In the non-hot water supply state where the return conduit forms an annular conduit and the hot water tap connected to the hot water supply conduit is not used, the circulation pump installed in the return conduit is operated to remove hot water in the circulation conduit. In a device that keeps the hot water temperature in the circulation pipe within a predetermined temperature range by appropriately performing a circulation warming operation that heats the heat exchanger while circulating, the temperature provided in the water supply pipe in the circulation pipe The circulation start determination means for determining the start of operation of the circulation pump based on the temperature of the hot water on the water inlet side of the heat exchanger detected by the sensor is provided, and this circulation start determination means is the water inlet side of the heat exchanger detected by the temperature sensor. The temperature of hot water is
When the temperature becomes lower than the set temperature set by the temperature setter by the second temperature difference which is larger than the first temperature difference,
It is characterized in that it is configured to start the operation of the circulation pump.

In order to achieve the third object, a circulation heat retention type hot water supply device according to a fifth aspect of the present invention connects a water supply pipe line end and a water supply pipe line by a return pipe line to form a water supply pipe line and a heat exchanger. In the non-hot water supply state where the hot water supply pipe and the return pipe form an annular pipe and the hot water plug connected to the hot water supply pipe is not used, the circulation pump installed in the return pipe is operated. In a device that keeps the hot water in the circulation pipe within a predetermined temperature range by appropriately performing a circulating heat retention operation in which the hot water is heated in the heat exchanger while circulating hot water in the water, a temperature sensor that detects the outside air temperature is installed. In addition, the time when the operation of the circulation pump is stopped is measured, and the lower the outside air temperature or the outside air temperature, the more the outside air temperature corresponds to the outside air temperature or the temperature difference between the outside air temperature and the set temperature set by the temperature setting device. Difference between the temperature and the set temperature set by the temperature setter, etc. When shorter timed circulatory arrest time has elapsed large, characterized by comprising a circulating start determination means for starting the operation of the circulation pump.

[0012]

In the circulation stop judging means in the circulation heat retention type hot water supply apparatus according to the first aspect, the state where the temperature of the hot water in the circulation pipe detected by the temperature sensor exceeds the set temperature is higher than the heating cycle by intermittent combustion. When the operation is continued for a sufficiently long time, the circulation pump operation is stopped and the heat retention heating operation is stopped. Therefore, the heating operation is not stopped by detecting the peak of the hot and cold water temperature due to the intermittent combustion, and the heating can be performed until the average value of the hot and cold water temperature in the circulation pipe slightly exceeds the set temperature.

The circulation stop judging means in the circulation heat retention type hot water supply apparatus according to the second aspect is such that the heat quantity required for circulation heat retention heating is
A condition that is smaller than the preset heat retention heating stop heating amount,
The heating by the heat exchanger is stopped and the operation of the circulation pump is stopped when the heating is continued for a predetermined time set sufficiently long for the heating cycle by the intermittent combustion. Therefore, the heating operation is not stopped by detecting the peak of the hot and cold water temperature associated with the intermittent combustion, and the heating can be performed until the average value of the hot and cold water temperature in the circulation pipeline reaches the set temperature.

In the circulation start judging means in the circulation heat retention type hot water supply apparatus according to the third aspect, the hot water temperature of the hot water supply pipe near the hot water outlet side of the heat exchanger has a first temperature difference (for example, 5) from the set temperature.
℃) or more, start the operation of the circulation pump. The hot water in the hot water supply pipe near the hot water outlet side of the heat exchanger is difficult to cool due to the residual heat of the heat exchanger, so operating the circulation pump in a state where the temperature drop is relatively small will cause The heating in the heat exchanger can be performed before the temperature of the hot water decreases significantly.

In the circulation start judging means in the circulation heat retention type hot water supply apparatus according to the fourth aspect, the hot water temperature on the water inlet side of the heat exchanger is larger than the first temperature difference (for example, 5 ° C.) with respect to the set temperature. When the second temperature difference (for example, 8 ° C.) or more decreases, the operation of the circulation pump is started. The temperature of the hot water on the inlet side of the heat exchanger is likely to drop because it is in contact with the water in the water supply pipe. For this reason, at the time when the temperature of this portion slightly decreases, the hot and cold water temperature of other portions in the circulation pipeline is often not so low. Therefore, the operation of the circulation pump is started when the temperature of the hot water on the incoming water side has decreased by the second temperature difference (eg, 8 ° C.) or more larger than the first temperature difference (eg, 5 ° C.) with respect to the set temperature. This can prevent the operating interval of the circulation pump from becoming too short.

The circulation start judging means in the circulation warming type hot water supply apparatus according to the fifth aspect limits the time for stopping the circulation operation as the outside air temperature is lower. Therefore, even if the temperature of the hot and cold water in the return pipe arranged outdoors, for example, is considerably lowered in winter etc., the problem that the circulation operation is not started because the temperature of the hot and cold water on the hot water supply pipe side is not lowered is solved. can do. Further, the lower the outside air temperature, the shorter the time interval for operating the circulation pump is set, so that there is no waste in the operation of the circulation pump.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an overall configuration diagram of a circulation warming type hot water supply apparatus according to the present invention. In the hot water supply device 1 in a hot water supply state in which the hot water tap 2 is opened, the water supplied from the water supply pipe 3 is heated by the heat exchanger 4, and the hot water is supplied from the hot water tap 2 via the hot water supply pipe 5. At the same time, in the non-hot water supply state in which the hot water tap 2 is closed, heat is exchanged by appropriately operating the circulation pump 7 provided in the return pipe 6 that connects the end side of the hot water supply pipe 5 and the water supply pipe 3. The heat exchanger 4 while circulating the hot and cold water in the circulation pipe 8 including the water supply pipe 3 and the return pipe 6 and the water supply pipe 3a downstream of the connecting portion between the water supply pipe 3 and the return pipe 6.
It is configured such that the hot water in the circulation conduit 8 can be maintained at a predetermined temperature by heating at.

The controller 9 controls the inlet of the heat exchanger 4 detected by the inlet temperature sensor 10 and the flow rate sensor 11 provided in the water supply pipe 3a downstream of the connection between the water supply pipe 3 and the return pipe 6. Side hot water temperature and flow rate, outlet hot water temperature detected by an outlet temperature sensor 12 provided on the heat exchanger 4 side of the hot water supply pipe 5, and outside air temperature detected by a temperature sensor 13 for detecting the outside air temperature, Insulation operation switch 14 and temperature setter 15
Using the set temperature of 1 as an input, the gas on-off valve 17 and the gas proportional valve 18 provided in the gas pipe 16, the fan 20 for supplying combustion air to the burner 19, and the operation of the circulation pump 7 are controlled. The outside air temperature sensor 13 is a fan 20.
It is provided in the outside air intake path (not shown).

The controller 9 is constructed by using a microcomputer system, and has a circulation start judging means 30,
A circulation stop determination unit 40, a pump operation control unit 50, a combustion control unit 60, and a hot water supply use detection unit 70 are provided.

FIG. 2 is a functional block configuration diagram of the circulation start judging means. The circulation start determination means 30 includes three systems of start determination means. The outlet temperature monitoring means 31 determines that the hot and cold water temperature TH in the hot water supply pipe line 5 near the hot water outlet side of the heat exchanger 4 detected by the outlet temperature sensor 12 is the set temperature TS set by the temperature setter 14. If the first temperature difference ΔT1 (for example, ΔT1 = 5 ° C.) set by the first temperature difference setting means 32 has decreased, the circulation start request 31 based on the outlet temperature 31.
a is generated.

The inlet-side temperature monitoring means 33 detects the hot water temperature TC on the inlet side of the heat exchanger 4 detected by the inlet-side temperature sensor 10,
When the second temperature difference ΔT2 (for example, ΔT2 = 8 ° C.) set by the second temperature difference setting unit 34 is lower than the set temperature TS, the circulation start request 3 based on the inlet temperature 3
3a is generated. The second temperature difference ΔT2 is set to a value larger than the first temperature difference ΔT1. Heat exchanger 4
Since the hot water on the inlet side of is in contact with the water of the water supply pipe 3, the temperature drops quickly. Therefore, the purpose is to prevent the circulation from being started before the temperature of the hot water in the hot water supply pipe 5 is lowered.

The circulation stop time measuring means 35 measures the time during which the operation of the circulation pump 7 is stopped based on the circulation pump operation state information 50a. The circulation stop permissible time table 36 includes a temperature difference (TS) between the set temperature TS and the outside temperature TK.
-TK) stores data relating to the circulation stop allowable time set in advance as a table. The larger the temperature difference (TS-TK) between the set temperature TS and the outside air temperature TK, the shorter the circulation stop allowable time is set. Therefore, the circulation pump can be operated at shorter time intervals. The circulation stop time monitoring means 37 searches the circulation stop permissible time table 36 on the basis of the temperature difference (TS-TK) 37a between the set temperature TS and the outside air temperature TK detected by the outside air temperature sensor 13 to obtain the circulation stop allowance. The data 36a relating to time is compared with the data 35a relating to the circulation stop time measured by the circulation stop time counting means 35, and if the circulation stop state exceeds the circulation stop allowable time, a circulation start request 37a based on time monitoring. To occur. Alternatively, the circulation stop permissible time may be set corresponding to the outside air temperature TK, and the circulation stop time may be limited only based on the outside air temperature TK.

The OR means 38 supplies the circulation start request 30a to the pump operation control means 50 regardless of which of the circulation start requests 31a, 33a, 37a is generated. The circulation start determination means 30 performs various monitoring in a state where the heat retention operation switch 14 is set to the heat retention operation state and the circulation pump 7 is stopped based on the circulation pump operation state information 50a. It is configured to operate.

FIG. 3 is a functional block configuration diagram of the circulation stop determination means. The circulation stop determination means 40 includes two systems of stop determination means. The temperature comparison means 41 generates an appropriate temperature output 41a when the inlet-side hot water temperature TC detected by the inlet-side temperature sensor 10 exceeds the set temperature TS. The duration monitoring means 42 monitors the duration of the suitable temperature output 41a,
When the suitable temperature output 41a continues for a preset time (for example, 30 seconds), the circulation stop request 42a is output.

The calorific value calculating means 43 calculates the calorific value required for the heat insulation heating by multiplying the temperature difference (TS-TC) between the set temperature TS and the inlet temperature TC by the circulation flow rate Q detected by the flow rate sensor 11. . The heat quantity comparison means 44 compares the calculated heat quantity 43a with the heat retention / heat stop heat quantity 45a preset in the heat retention / heat stop heat quantity setting means 45, and when the calculated heat quantity 43a is equal to or lower than the heat retention / heat stop heat quantity 45a. , The heating unnecessary output 44a is generated. The continuous time monitoring means 46 is
The duration of the heating unnecessary output 44a is monitored, and when the heating unnecessary output 44a continues for a preset time (for example, 30 seconds), the circulation stop request 46a is generated.

It should be noted that the burner 19 keeps the proper temperature output 41a continuously monitored and the heating unnecessary output 44a continuously monitored.
Is set to a sufficiently long time with respect to the intermittent combustion cycle when performing intermittent combustion. This prevents the circulation from being stopped at the peak of the temperature change due to the intermittent combustion. The continuous monitoring time may not be a fixed value, and the continuous monitoring time may be set according to the current intermittent combustion cycle.

The logical sum means 47, regardless of which of the circulation stop requests 42a and 46a is generated, the circulation stop request 40.
a is supplied to the pump operation control means 50. The circulation stop determination means 40 is configured to perform a determination operation based on the circulation pump operating state information 50a when the circulation pump 7 is in the operating state.

FIG. 4 is a functional block configuration diagram relating to pump operation control and combustion control. Pump operation control means 5
When the circulation start determination means 30 outputs the circulation start request 30a, 0 outputs the circulation pump operation command 50b to start the operation of the circulation pump 7, and the circulation stop determination means 40 outputs the circulation stop request 40a. Then, the output of the circulation pump operation command 50b is stopped, and the operation of the circulation pump 7 is stopped. Then, the pump operation control means 50 outputs the circulation pump operation state information 50a indicating whether the circulation pump 7 is in the operation state or in the stop state. Further, when the hot water supply heating request 70a described later is supplied, the pump operation control means 50 stops the output of the circulation pump operation command 50b, and a new circulation start request 30a is issued after the hot water supply heating request 70a is canceled. Circulation pump operation command 50 when input
Output b.

The combustion control means 60 detects the temperature difference between the set temperature TS and the hot water temperature TC by the flow rate sensor 11 when the circulation pump 7 is operating and when the hot water supply heating request 70a is given. The amount of heat required for keeping the circulation is calculated by multiplying the flow rate Q, and the start / stop of combustion is controlled based on the calculated amount of heat. When the calculated heat amount is smaller than the predetermined amount, the combustion control means 60 selects the intermittent combustion mode, determines the on-time and off-time of the intermittent combustion by referring to a table registered in advance, and operates the fan 20 and gas. The burner 19 is intermittently burned by controlling the opening and closing of the gas on-off valve 17 while the proportional valve 18 is kept at the minimum opening degree, for example. When the calculated heat amount exceeds the predetermined amount, the combustion control means 60 selects the proportional combustion mode and the fan 20
Is operated to drive the gas on-off valve 17 to open, and the opening of the gas proportional valve 18 is adjusted so that the required amount of heat is supplied.

The hot water supply use detecting means 70 detects hot water from the hot water tap 2 and outputs a hot water supply heating request 70a.
The hot water supply use determination means 71, the hot water supply determination flow rate storage means 72 when the pump is stopped, and the hot water supply determination flow rate storage means 73 when the pump is operating.

When the circulation pump 7 is not in operation, the hot water supply use detecting means 70 supplies the hot water supply use determination flow rate QPoff when the pump is stopped, which is supplied from the hot water supply determination flow rate storage means 72 when the pump is stopped (for example, 1 to 1 minute per minute). 1.5 liters)
Is compared with the flow rate Q detected by the flow rate sensor 11, and when the detected flow rate Q exceeds the hot water supply use determination flow rate QPoff, it is determined that hot water is being used from the hot water tap 2 and a hot water supply heating request is made. 70a is output. When the circulation pump 7 is in operation, the hot water supply use determination flow rate QPon during pump operation supplied from the hot water supply determination flow rate storage unit 73 during pump operation is compared with the flow rate Q detected by the flow rate sensor 11. The detected flow rate Q is the hot water supply use determination flow rate QPo
When n is exceeded, it is determined that hot water is being used from the hot water tap 2 and a hot water heating request 70a is output. The hot water supply use determination flow rate QPon during the pump operation is set to a flow rate (for example, 3 to 3.5 liters per minute) larger than the circulation flow rate during the circulation pump operation (for example, 2 liters per minute).

The operation / stop operation of the circulation pump having the above construction will be described with reference to the flow chart shown in FIG.
When the heat retention operation switch 14 is set to the heat retention operation request state, the circulation start determination means 30 determines that the hot water temperature TH on the hot water supply pipe 5 side is lower than the set temperature TS by a first value (for example, 5 ° C.) or more. It is determined whether or not there is (S1), and if it has decreased, a circulation start request 30a is generated to start the operation of the circulation pump 7 (S4). Also, the circulation start judging means 30
Determines whether or not the hot water temperature TC on the inlet side of the heat exchanger 4 is lower than the set temperature TS by a second value (for example, 8 ° C.) or more (S2). The operation of No. 7 is started (S4). Further, the circulation start judging means 3
0 checks whether the time during which the circulation pump is stopped exceeds the preset allowable stop time based on the outside air temperature TK (S3). If it exceeds, the operation of the circulation pump 7 is stopped. It is started (S4).

When the hot water in the annular pipe is circulated by the operation of the circulation pump 7, the combustion control means 60 causes the circulation flow rate Q,
The required heat retention heating amount is calculated based on the hot water temperature TC on the inlet side and the set temperature TS, and the burner 19 is intermittently burned to heat the hot water in the circulation pipe via the heat exchanger 4 (S
5).

When the inlet hot water temperature TC exceeds the set temperature TS for a predetermined time (for example, 30 seconds) (S6), the circulation stop condition determining means 40 issues the circulation stop command 40a to generate the circulation pump 7. Is stopped (S8). Also, when the amount of heat required to heat the hot and cold water of the inlet hot water temperature TC to the set temperature TS is equal to or less than the preset heating stop amount for a predetermined time (S7), the circulation pump 7 Is stopped (S8).

The circulation start determining means 30 determines when the temperature of the hot and cold water on the inlet side and the outlet side of the heat exchanger 4 is set with respect to the set temperature TS at each temperature detection point and drops by a temperature difference or more. Drive 7 Then, since the combustion control means 60 calculates the required heating amount and performs the heat retention heating, the temperature of the hot and cold water in the circulation pipe line 8 does not drop significantly.
Further, even when the temperature of the hot water on the inlet side and the temperature of the hot water on the outlet side have not dropped so much, if the outside air temperature TK has dropped, the circulation pump 7 is operated at time intervals corresponding to the outside air temperature TK. Therefore, when the temperature of the hot water in the hot water supply pipe 6 portion that is piped outdoors or the like is lowered, this can be detected and the heat retention heating can be performed. Further, since the operating interval of the circulation pump 7 is set shorter as the outside air temperature TK is lower, there is no waste in the operation of the circulation pump 7.

The circulation stop judging means 40 judges the stop condition of the circulation heating by continuously monitoring the influence of the pulsation of the hot water temperature caused by the heat-retention heating in the intermittent combustion for a predetermined period of time to judge the circulation heating stop condition. It is possible to reliably heat the temperature of the hot water in the circulation pipe 8 until it exceeds the set temperature TS.

[0037]

According to the first aspect of the present invention, the circulation stop judging means in the circulation warming type hot water supply apparatus has the heating cycle by the intermittent combustion when the temperature of the hot water in the circulation pipe detected by the temperature sensor exceeds the set temperature. Since the circulation pump is stopped and the heating operation is stopped when the operation is continued for a sufficiently longer time, the heating operation is not stopped by detecting the peak of hot and cold water temperature accompanying intermittent combustion. The heating can be performed until the average value of the temperature of the hot and cold water in the circulation pipe slightly exceeds the set temperature.

The circulation stop determination means in the circulation heat retention type hot water supply apparatus according to the second aspect is such that the heat quantity required for the circulation heat retention heating is
A condition that is smaller than the preset heat retention heating stop heating amount,
When the heating for the intermittent combustion is continued for a predetermined time that is set long enough, the heating by the heat exchanger is stopped and the operation of the circulation pump is stopped. The heating operation is not stopped upon detection, and heating can be performed until the average value of the temperature of the hot and cold water in the circulation pipe reaches approximately the set temperature.

In the circulation start judging means in the circulation warming type hot water supply apparatus according to the third aspect, the hot water temperature of the hot water supply pipe near the hot water outlet side of the heat exchanger has a first temperature difference (for example, 5) from the set temperature.
The temperature of the circulating pump is started when the temperature drops above 0 ° C), so it is possible to heat the hot water in the heat exchanger before the temperature of the hot water in other parts of the circulation pipe drops significantly. it can.

In the circulation start judging means in the circulation heat retention type hot water supply apparatus according to the fourth aspect, the hot water temperature on the water inlet side of the heat exchanger is larger than the first temperature difference (for example, 5 ° C.) with respect to the set temperature. Since the operation of the circulation pump is started when the temperature difference drops by the second temperature difference (for example, 8 ° C.) or more, it is possible to prevent the operation interval of the circulation pump from becoming too short.

Since the circulation start judging means in the circulation warming type hot water supply apparatus according to claim 5 is constituted so as to limit the period of time during which the circulation operation is stopped in accordance with the outside air temperature, the hot water supply is arranged, for example, outdoors in winter. Even if the temperature of the hot and cold water in the pipe is considerably lowered, it is possible to solve the problem that the circulation operation is not started because the hot and cold water temperature at the outlet side or the inlet side of the heat exchanger is not lowered. Further, the lower the outside air temperature, the shorter the time interval for operating the circulation pump is set, so that there is no waste in the operation of the circulation pump.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a circulating water heater according to the present invention.

FIG. 2 is a functional block configuration diagram of circulation start determination means.

FIG. 3 is a functional block configuration diagram of circulation stop determination means.

FIG. 4 is a functional block configuration diagram relating to operation control and combustion control of a circulation pump.

FIG. 5 is a flowchart showing operation / stop operation of the circulation pump.

[Explanation of symbols]

 1 Hot Water Supply Device 2 Hot Water Tap 3 Water Supply Pipeline 4 Heat Exchanger 5 Hot Water Supply Pipeline 6 Return Pipeline 7 Circulation Pump 8 Circulation Pipeline 9 Controller 10 Inlet Temperature Sensor 11 Flow Sensor 12 Outflow Sensor 13 Outside Air Temperature Sensor 14 Insulation Operation switch 15 Temperature setter 30 Circulation start determination means 40 Circulation stop determination means 50 Pump operation control means 60 Combustion control means 70 Hot water supply use detection means

Front page continuation (72) Masaki Nakamura, 1-1 1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture (72) Inventor Kiyotaka Nakano 43-1, Uozakihama-cho, Higashinada-ku, Kobe, Hyogo Prefecture Nihon Yupro Co., Ltd. (72) Inventor Shinji Miura 43-1, Uozakihama-cho, Higashinada-ku, Kobe City, Hyogo Prefecture Nihon Yupro Co., Ltd. (72) Inventor Tetsuro Takada 43-1, Uozakihama-cho, Higashinada-ku, Kobe City, Hyogo Prefecture Inside Nihon Yupro Co., Ltd. (72) Inventor Hikaru Hira-gun 43-1 Uozakihama-cho, Higashinada-ku, Kobe City, Hyogo Prefecture

Claims (5)

[Claims] 1. A hot water supply conduit is formed by connecting the end of the hot water supply conduit with the water supply conduit by a return conduit to form an annular conduit by the water supply conduit, the heat exchanger, the hot water supply conduit, and the return conduit. In the non-hot water supply state where the hot water plug connected to is not used, the circulation heat insulation operation of heating the heat in the heat exchanger while circulating the hot water in the circulation pipe by operating the circulation pump installed in the return pipe is appropriately performed. By doing so, in a circulating warm water heater that keeps the temperature of the hot water in the circulation pipe within a predetermined temperature range, the circulation pump is operated based on the detection output of a temperature sensor installed at an arbitrary position in the circulation pipe. It is equipped with a circulation stop determination means for determining stoppage, and this circulation stop determination means detects intermittent combustion when the temperature of the hot and cold water in the circulation pipe detected by the temperature sensor exceeds the set temperature set by the temperature setting device, etc. Place set sufficiently long for the heating cycle When duration circulating heat insulating type hot water supply apparatus characterized by being configured so as to stop the operation of the circulation pump stops the heating by the heat exchanger. 2. The hot water supply pipe is formed by connecting the end of the hot water supply pipe and the water supply pipe by a return pipe to form an annular pipe by the water supply pipe, the heat exchanger, the hot water supply pipe and the return pipe. In the non-hot water supply state where the hot water plug connected to is not used, the circulation heat insulation operation of heating the heat in the heat exchanger while circulating the hot water in the circulation pipe by operating the circulation pump installed in the return pipe is appropriately performed. In the circulating warm water heater that keeps the hot water temperature in the circulation pipeline within the specified temperature range, the flow rate sensor installed at any position in the circulation pipeline and the water supply pipeline in the circulation pipeline. In addition to the circulation stop judging means for judging the operation stop of the circulation pump based on each detection output of the temperature sensor provided in, the circulation stop judging means and the hot and cold water temperature of the inlet side of the heat exchanger detected by the temperature sensor. , The temperature difference from the set temperature set by the temperature setter, etc. When the heat retention heating amount obtained by multiplying the circulation flow rate detected by the flow rate sensor is smaller than the preset heat retention heating stop heating amount, when the heating cycle by intermittent combustion continues for a predetermined time set sufficiently long A circulation warming type hot water supply device, characterized in that the heating by the heat exchanger is stopped and the operation of the circulation pump is stopped. 3. A hot water supply conduit is formed by connecting the end of the hot water supply conduit and the water supply conduit with a return conduit to form an annular conduit by the water supply conduit, the heat exchanger, the hot water supply conduit, and the return conduit. In the non-hot water supply state where the hot water plug connected to is not used, the circulation heat insulation operation of heating the heat in the heat exchanger while circulating the hot water in the circulation pipe by operating the circulation pump installed in the return pipe is appropriately performed. Based on the hot water temperature detected by the temperature sensor installed in the hot water supply pipe near the hot water outlet side of the heat exchanger, in the circulating warm water heater that keeps the hot water temperature in the circulation pipe within the specified temperature range. In addition to providing a circulation start judging means for judging the start of operation of the circulation pump, the circulation start judging means detects that the temperature of the hot water in the hot water supply pipe detected by the temperature sensor is higher than the set temperature set by the temperature setter or the like. When the temperature becomes lower than the preset first temperature difference Circulating heat insulating type hot water supply apparatus characterized by being configured so as to start the operation of the circulation pump. 4. A hot water supply conduit is formed by connecting the end of the hot water supply conduit with the water supply conduit by a return conduit to form an annular conduit by the water supply conduit, the heat exchanger, the hot water supply conduit, and the return conduit. In the non-hot water supply state where the hot water plug connected to is not used, the circulation heat insulation operation of heating the heat in the heat exchanger while circulating the hot water in the circulation pipe by operating the circulation pump installed in the return pipe is appropriately performed. In the circulating warm water heater that keeps the temperature of the hot water in the circulation pipe within the specified temperature range, the water inlet side of the heat exchanger detected by the temperature sensor provided in the water pipe in the circulation pipe. The circulation start judging means for judging the start of operation of the circulation pump based on the temperature of the hot water of the circulation pump is provided, and the circulation start judging means detects the temperature of the hot water on the water inlet side of the heat exchanger detected by the temperature sensor, such as a temperature setter. Than the set temperature set in Kina when it is the second or higher temperature difference lower circulating heat insulating type hot water supply apparatus characterized by being configured so as to start the operation of the circulation pump. 5. A hot water supply conduit is formed by connecting the end of the hot water supply conduit with the water supply conduit by a return conduit to form an annular conduit by the water supply conduit, the heat exchanger, the hot water supply conduit, and the return conduit. In the non-hot water supply state where the hot water plug connected to is not used, the circulation heat insulation operation of heating the heat in the heat exchanger while circulating the hot water in the circulation pipe by operating the circulation pump installed in the return pipe is appropriately performed. By doing so, a circulating heat insulation type device that keeps the hot water temperature in the circulation pipe within a predetermined temperature range is equipped with a temperature sensor that detects the outside air temperature and measures the time when the circulation pump is stopped. In response to the outside air temperature or the temperature difference between the outside air temperature and the set temperature set by the temperature setter, etc., the lower the outside air temperature or the temperature difference between the outside air temperature and the set temperature set by the temperature setter, etc. The larger the value, the shorter the set circulation stop time When the circulating heat insulating type hot water supply apparatus comprising the circulation start determination means for starting the operation of the circulation pump.