JPH09303798A - Hot water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to conduct the energy conservation and sound reduction with the pump output corresponding to the drive state by providing an output variable warm water circulating pump and an expansion tank having an air bleeding function of the water, and controlling the pump for a predetermined time after a power source is turned on to a predetermined output. SOLUTION: Circulating hot water is controlled by a warm water temperature sensor 10, a gas volume controller 3, a gas burning unit 4 and a main controller 15 to become 80 deg.C at a hot water forward tube 11. The circulated warm water performing the heating function is introduced into an expansion tank 14 via a return tube 13, and again heated by a heat exchanger 5. A hot water circulating pump 7 is operated at high output for initial 10 minutes of the operation capable of releasing the so-called pump block state. Further, the air in a hot water conveying tube can be smoothly air bled. After the lapse of 10min, i.e., when the pump 7 is started and the tube is air bled completely, the pump 7 is operated at the normal output capable of conducting the energy conservation and sound reduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water heating apparatus in which water is used as a heating medium and heated hot water is circulated by a hot water circulation pump for heating.

[0002]

2. Description of the Related Art A conventional hot water circulating pump in this type of hot water heating apparatus has a constant output.

[0003]

The hot water circulation pump in this hot water heating apparatus requires a relatively high output at the time of starting operation or when air is mixed in the hot water pipe, but the normal operation is not possible. When it becomes a state, such a high output becomes unnecessary. Therefore, if the output of the hot water circulation pump is constant, there is a problem that unnecessary energy is consumed during normal operation.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention makes it possible to change the output of a hot water circulation pump of a hot water heating apparatus by switching at a predetermined timing. Then, by using the hot water circulation pump whose output can be changed in this way, the pump output can be made to correspond to the operating state of the hot water heating device, and energy saving and noise reduction can be achieved.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 has a heat exchanger for heating water, a heating device for heating the heat exchanger, a hot water circulating pump with variable output, and an air venting function for circulating water. An expansion tank is provided, and the hot water circulation pump is controlled to have a predetermined output for a predetermined time after the power is turned on.

With the above structure, the output of the hot water circulation pump is increased at the initial stage after the power is turned on, especially at the start of the trial run, or when the air bleeding operation is required due to the inclusion of air in the hot water pipe. By smoothing the start-up and deaeration operation and returning to the normal output after the elapse of a predetermined time, the power consumption of the hot water circulation pump can be reduced and the operation noise can be reduced during the normal operation.

Further, in the invention according to claim 2, the output of the hot water circulation pump is switched and controlled according to the output of the variable output heating device controlled by the hot water temperature sensor provided on the downstream side of the heat exchanger. It is a thing.

When the output of the heating device is large, the output of the hot water circulation pump is high when the output of the heating device is small, and when the output of the heating device is small, the output of the hot water circulation pump is low. It can operate with low power and low noise.

In the invention according to claim 3, a hot water temperature sensor is provided on the upstream side of the heat exchanger, and if the detected value is below a predetermined value, the hot water circulation pump is switched to a high output. It is a thing.

When the circulating hot water temperature on the upstream side of the heat exchanger is low, for example, in the initial stage of operation or when the heating load is large, the hot water circulating pump is switched to a high output to make the start-up smooth and The heating output of the heating terminal can be increased by increasing the circulating amount of hot water. When the hot water temperature becomes equal to or higher than a predetermined value, the output is returned to the original value, so that it is possible to achieve power saving and noise reduction without hindering the operation.

Further, the invention according to claim 4 is such that a temperature sensor for detecting the outside air temperature is provided, and the output of the hot water circulation pump is switched by the output thereof.

When the temperature sensor for detecting the outside air temperature has an output below a predetermined value, the output of the hot water circulation pump is switched to a low level. Therefore, the freeze prevention operation of the hot water heating device does not hinder the operation, saves power, and saves power. You can drive with noise.

Further, in the invention according to claim 5, a flow rate sensor for detecting the hot water circulation flow rate is provided on the upstream side of the heat exchanger, and a flow rate changeover switch for setting the hot water circulation flow rate is provided. The output of the hot water circulation pump is controlled so that the value becomes the flow rate set by the flow rate changeover switch.

Then, by controlling the output of the hot water circulation pump so that the hot water circulation amount becomes the flow rate set by the flow rate changeover switch, the hot water heating device does not hinder the operation, saves power, and reduces noise. can do.

Further, in the invention according to claim 6, a pressure sensor for detecting the water pressure of the circulating hot water is provided on the downstream side of the heat exchanger, and the output of the hot water circulation pump is adjusted so that the detected value becomes a predetermined value. It is designed to be controlled.

By controlling the output of the hot water circulation pump so that the water pressure on the downstream side of the heat exchanger becomes a predetermined value,
The output of the hot water circulation pump does not exceed the required output, so that there is no hindrance to operation, and power consumption and noise can be reduced.

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a schematic diagram of the configuration of a gas hot water heating apparatus according to Embodiment 1 of the present invention.

In FIG. 1, 1 is an exterior body, 2 is an inlet for gas combustion air, 3 is a gas quantity controller, 4 is a gas combustion section, and heating is performed by the gas quantity controller 3 and the gas combustion section 4. Make up the vessel. 5 is a heat exchanger, 6 is a combustion exhaust gas outlet,
7 is a hot water circulation pump with variable output, 8 is a hot water inlet pipe of the heat exchanger 5, 9 is a hot water outlet pipe of the heat exchanger 5, 10 is a hot water temperature sensor, 11 is a hot water outlet pipe, 12 is a hot water heating terminal device, 1
Reference numeral 3 is a warm water return pipe, 14 is an expansion tank that absorbs air from the circulating water and expansion / contraction, and 15 is a main controller.

The main controller 15 operates the hot water circulation pump 7 as shown in the operation sequence diagram of FIG.
That is, after the power is turned on, the hot water circulation pump 7 is operated at a high output for the first operation, that is, for 10 minutes, and thereafter, a normal output operation is performed.

The operation and action of the hot water heating apparatus configured as described above will be described.

In the hot water outflow pipe 11, the circulating hot water is
It is controlled by the hot water temperature sensor 10, the gas amount controller 3 and the gas combustor 4 constituting the heater, and the main controller 15 so as to be 80 ° C., and is conveyed to the hot water heating terminal device 12. The circulating hot water whose temperature has been lowered by performing the heating function in the hot water heating terminal device 12 flows to the expansion tank 14 from the hot water return pipe 13, and is then pressurized by the hot water circulating pump 7 to the hot water inlet pipe 8 of the heat exchanger 5. After that, it returns to the heat exchanger 5 and is heated in the heat exchanger 5 again to be continuously operated.

By operating the hot water circulation pump 7 at a high output for the first 10 minutes of this operation, an inoperative state caused by leaving the hot water circulation pump 7 unused for a long period of time,
The so-called pump lock state can be released, and smooth air bleeding can be achieved when air is present in the hot water transfer pipe, that is, the hot water outflow pipe 11, the hot water return pipe 13, etc., for example, during a trial run. Can drive.

After 10 minutes, that is, when the hot water circulation pump 7 is started and the air in the carrier pipe is removed, the warm water circulation pump 7 is put into the normal output operation to save energy and reduce noise. Be peeled off.

Furthermore, by limiting the high-power operation time, if the motor windings of the hot water circulation pump 7 are the same, under the output conditions limited by the temperature rise of the windings,
There is also an effect that a higher output can be obtained.

(Embodiment 2) FIG. 3 is a schematic diagram of the configuration of a gas hot water heating apparatus according to a second embodiment of the present invention, and FIG. 4 is an operation characteristic diagram of a hot water circulation pump.

The difference from the first embodiment is that the hot water circulation pump 7 is provided with a main controller 16 which operates according to the characteristics shown in FIG.

The same reference numerals as those in the first embodiment indicate the same structures, and the description thereof will be omitted. Next, the operation and action will be described. The output characteristic of the gas amount controller 3 constituting the heater is linked with the output of the hot water circulation pump 7 whose output is variable as shown in FIG. In FIG. 4, the horizontal axis represents the gas amount controller 3
Output characteristic, generally, the operating current I of the gas proportional control valve, and the vertical axis represents the output characteristic of the hot water circulation pump 7, for example, the pump rotation speed R that satisfies the expression 1.

(Equation 1) R = kI + c In Equation 1, k is a constant of proportionality, and c is a constant (even when the output of the gas amount controller 3 is zero, the pump output is a predetermined amount). Note that this characteristic is an example, and may be another characteristic.

By operating as described above, the output of the hot water circulation pump 7 can be set according to the output of the heater, and energy saving and noise reduction can be achieved without hindering the operation.

(Embodiment 3) FIG. 5 is a schematic diagram of the configuration of a gas hot water heating apparatus according to a third embodiment of the present invention.

A difference from the first embodiment is that a hot water temperature sensor 17 is provided in the hot water inlet pipe 8 on the upstream side of the heat exchanger 5, and if the detected value by the hot water temperature sensor 17 is below a predetermined value, hot water circulation is performed. The pump 7 is provided with a main controller 18 which operates at a relatively high output.

The same reference numerals as those used in the first embodiment indicate the same structures, and the description thereof will be omitted. Next, the operation and action will be described. In the hot water outflow pipe 11, the circulating hot water is 80
The temperature of the hot water sensor 10, the gas amount controller 3 and the gas combustor 4 constituting the heater, and the main controller 1 are adjusted so that the temperature becomes 0 ° C.
It is controlled by 5 and is conveyed to the hot water heating terminal device 12. Therefore, the hot water temperature sensor 17 detects a normal hot water temperature of about 60 ° C. when the hot water heating terminal 12 performs rated work, that is, when heating. When the detected value is below 60 ° C., the output of the hot water circulation pump 7 is made relatively high, so that the hot water circulation amount increases and the hot water heating terminal 1
The heating output of 2 can be increased.

Furthermore, when the hot water temperature at the beginning of operation is low,
Alternatively, the hot water circulation pump 7 can be operated at a high output even at the time of startup, and the operation can be smoothly started up. Then, when the temperature of the hot water temperature sensor 17 becomes 60 ° C. or higher, the output of the hot water circulation pump 7 is returned to the original output, so that it is possible to achieve energy saving and noise reduction without hindering the operation.

(Embodiment 4) FIG. 6 is a schematic diagram of a gas hot water heating apparatus according to a fourth embodiment of the present invention.

The difference from the first embodiment is that the outside air temperature sensor 19
Is attached to the exterior body 1, and a main controller 20 for switching the hot water circulation pump 7 to a low output operation according to the detected value is provided.

The same reference numerals as those in the first embodiment indicate the same structures, and the description thereof will be omitted. Next, the operation and action will be described. Generally, even if the hot water heating apparatus of this kind is not operated for heating, when the outdoor temperature in winter becomes less than 4 ° C., the hot water heating apparatus starts operation in order to prevent freezing of the apparatus. That is, when the outside air temperature sensor 19 detects less than 4 ° C., only the hot water circulation pump 7 starts operating, so that the temperature of the circulating water becomes zero.
Even at a temperature of ℃, it is possible to prevent the freezing of the device by flowing the circulating water.

At this time, even if the circulating water does not flow at a sufficient flow rate, it does not freeze if the water is moving.

Therefore, the output of the hot water circulation pump 7 can be lowered by the main controller 20, and the energy saving and the noise reduction can be achieved without hindering the freeze prevention operation. The main controller 20 is configured such that the output of the hot water circulation pump 7 becomes a normal output when the normal heating operation is started.

(Embodiment 5) FIG. 7 is a schematic diagram of the configuration of a gas hot water heating apparatus according to a fifth embodiment of the present invention.

The difference from the first embodiment is that the hot water inlet pipe 8 on the upstream side of the heat exchanger 5 is provided with a flow rate sensor 21 for detecting the hot water circulation flow rate, and the main controller 22 is a flow rate whose set flow rate can be changed. A changeover switch is provided so that the detected value of the flow rate sensor 21 becomes the flow rate set by the flow rate changeover switch.
The point is that the output of the hot water circulation pump 7 is controlled.

The same reference numerals as those used in the first embodiment indicate the same structures, and the description thereof will be omitted. Next, the operation and action will be described. Generally, in this type of hot water heating apparatus, at least one heating terminal device 12 is connected, and in the case of a large number, about ten heating terminal devices 12 are connected.
At that time, the required circulating hot water volume is approximately 2 liters / minute when one heating terminal 12 is connected and approximately 20 liters / minute when 10 heating terminals are connected. The difference between Therefore, in order to obtain a flow rate corresponding to the number of the heating terminals 12, the set flow rate is switched by the flow rate changeover switch, and the output of the hot water circulation pump 7 is controlled so that the flow rate becomes the same, thereby causing no hindrance to the operation. Energy saving and noise reduction can be achieved. Especially when the number of heating terminals 12 to be connected is small, the effect is great.

The flow rate sensor 21 is provided on the upstream side of the heat exchanger 5 because the temperature of the hot water circulating fluid to be detected is lower, so that the reliability of the flow rate sensor 21 is increased.

(Embodiment 6) FIG. 8 is a schematic diagram of the configuration of a gas hot water heating apparatus according to a sixth embodiment of the present invention.

The difference from the first embodiment is that a pressure sensor 23 for detecting the water pressure of circulating hot water is provided in the hot water outflow pipe 11 on the downstream side of the heat exchanger 5, and the detected value is a value capable of ensuring the hot water circulation amount. The main controller 24 for controlling the output of the hot water circulation pump 7 is provided so as to achieve the above.

The same reference numerals as those in the first embodiment indicate the same structures, and the description thereof will be omitted. Next, the operation and action will be described. Generally, in this kind of hot water heating apparatus, the diameter and maximum length of the carrier pipe, that is, the hot water outflow pipe 11, the hot water return pipe 13, or the type of the heating terminal 12 that can be connected. Is determined by the output of the hot water circulation pump 7. On the other hand, the relationship between the flow rate and the pressure of the hot water circulation pump 7 is as shown in FIG. Therefore, if the pressure required to operate the hot water heating system is p, the hot water circulation flow rate that can be flowed is a when the maximum output of the hot water circulation pump 7 is A, b when the output is B, and when the output is C. Is c.

As described in the fifth embodiment, the circulating hot water volume required for heating is about 2 liters / minute when one heating terminal 12 is connected, and about 20 when 10 terminals are connected.
Since it is about 1 liter / minute, if the flow rate a in FIG. 9 is about 20 liters / minute and the flow rate c is 6 liters / minute,
When the output of the hot water circulation pump 7 is A, the heating terminal 12
Can operate up to 10 units, and when the output is C, up to 3 units can be operated. That is, in the case of a hot water heating system in which three heating terminals 12 are operated, the required pump output is C
Will be good. As described above, by controlling the circulating hot water pressure so as to always have the predetermined value, it is possible to achieve energy saving and noise reduction without hindering the operation.

[0047]

The present invention is embodied in the form as described above, and by switching the output of the variable-temperature hot water circulation pump at a predetermined timing of operation, there is no hindrance to the operation, and energy and noise can be reduced. It has an advantageous effect.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gas hot water heating device according to a first embodiment of the present invention.

FIG. 2 is an operation sequence diagram of the gas hot water heating system.

FIG. 3 is a schematic configuration diagram of a gas hot water heating device according to a second embodiment of the present invention.

FIG. 4 is an operation characteristic diagram of a hot water circulation pump of the gas hot water heating device.

FIG. 5 is a schematic configuration diagram of a gas hot water heating device according to a third embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a gas hot water heating device according to a fourth embodiment of the present invention.

FIG. 7 is a schematic configuration diagram of a gas hot water heating device according to a fifth embodiment of the present invention.

FIG. 8 is a schematic configuration diagram of a gas hot water heating device according to a sixth embodiment of the present invention.

FIG. 9 is a characteristic diagram of the flow rate and pressure of the hot water circulation pump of the gas hot water heating apparatus.

[Explanation of Codes] 4 Gas Combustion Section 5 Heat Exchanger 7 Hot Water Circulation Pump 10,17 Hot Water Temperature Sensor 14 Expansion Tank 15,16,18,20,22,24 Main Controller 19 Outside Air Temperature Sensor 21 Flow Rate Sensor 23 Pressure Sensor

Claims (6)

[Claims] 1. A heat exchanger for heating water, a heating device for heating the heat exchanger, a hot water circulating pump with variable output, and an expansion tank having an air venting function for circulating water. A hot water heating device that controls the hot water circulation pump to a predetermined output for a predetermined time. 2. The hot water heating apparatus according to claim 1, wherein the output of the hot water circulating pump is switched and controlled in accordance with the output of a variable output heating device controlled by a hot water temperature sensor provided downstream of the heat exchanger. 3. The hot water heating apparatus according to claim 1, wherein a hot water temperature sensor is provided on the upstream side of the heat exchanger, and the hot water circulation pump is switched to a high output when the hot water temperature sensor has a predetermined detection value or less. 4. The hot water heating apparatus according to claim 1, wherein a temperature sensor for detecting the outside air temperature is provided, and the output of the temperature sensor switches the output of the hot water circulation pump. 5. A flow rate sensor for detecting the circulating flow rate of hot water is provided on the upstream side of the heat exchanger, and a flow rate changeover switch for setting the circulating flow rate of hot water is provided. The hot water heating apparatus according to claim 1, wherein the flow rate is set by a flow rate changeover switch. 6. A pressure sensor for detecting the water pressure of circulating hot water is provided downstream of the heat exchanger, and the detected value of this pressure sensor is set to a predetermined value by controlling the output of the hot water circulating pump. Hot water heating system.