JP3163435B2 - Hot water circulation type heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulating heater for performing hot water heating and bath heating using hot water heated by a burner.

[0002]

2. Description of the Related Art As a hot water circulating heater of this type, a heat exchanger is provided in a blower for circulating room air, using hot water heated and circulated by a burner as a heat medium. In addition to heating the indoor air and blowing it as warm air, heating is performed, and warm water is circulated through a warm water mat placed under the floor to heat the floor and guide the hot water to the liquid-liquid heat exchanger. It is known that water or hot water in a bath tub is circulated through the liquid-liquid heat exchanger, heated by heat transfer from hot water, and then returned to the bath tub to perform bath heating such as reheating.

[0003]

In the above-mentioned conventional hot water circulation type heater, a burner having a relatively large maximum combustion amount is used so that it is sufficient even if the hot water heating and the bath heating are simultaneously performed. On the other hand, the combustion noise increases as the amount of combustion in the burner increases. Therefore, if the maximum combustion amount of the burner is large as described above, the combustion noise when burning at the maximum combustion amount is considerably large.

[0004] In view of the above problems, an object of the present invention is to provide a hot water circulation type heater capable of minimizing combustion noise.

[0005]

In order to achieve the above object, the present invention provides a method in which hot water heating and bath heating are performed simultaneously using hot water circulated while heating with one burner as a heat medium, or a hydronic heating system that can perform only one of the gas supply of the burner the combustion amount of the burners
The temperature of the hot water is controlled by a proportional control valve
In controls so that the temperature, in the case of only one of the above water heating and bath heating, the
The proportional control valve is opened at a specified opening that is narrower than the full opening.
And a combustion amount limiting means for limiting the upper limit of the combustion amount of the burner to a predetermined combustion amount lower than the maximum combustion amount in the case of simultaneously performing the hot water heating and the bath heating.

[0006]

When both hot water heating and bath heating are performed at the same time, it is necessary to operate the burner at the maximum combustion amount in order to sufficiently exhibit both functions. In addition, when only one of the hot water heating and the bath heating is performed, by operating the burner at the maximum combustion amount, the temperature of the hot water as the heat medium can be increased to a desired temperature in a shorter time. . However, the burner's maximum combustion amount is set on the assumption that both hot water heating and bath heating are performed, and if only one of them is performed, no problem occurs even if the burner is not operated at the maximum combustion amount. Absent. Therefore, when performing only one of the hot water heating and the bath heating, the combustion noise is suppressed by limiting the upper limit of the combustion amount of the burner to a predetermined combustion amount lower than the maximum combustion amount.

[0007]

FIG. 1 shows an outline of a system that uses a gas water heater 1 to perform a hot air heating operation and a reheating of a bath in which the intensity can be switched. In the case of the hot air heating operation, high-temperature hot water (hereinafter, referred to as primary hot water) is supplied from the gas water heater 1 to the air conditioner A via the forward path f1, and the room air is heated by the high-temperature hot water to enter the room as hot air. Blow. The air conditioner is provided with a fan for blowing air and a heat exchanger (radiator) located in the air passage of the fan and through which the primary hot water flows. Even so, a proportional control valve for increasing or decreasing the circulation amount of the primary hot water is provided so that the amount of heat given to the blown air from the radiator is kept constant. The air blowing temperature can be set in two levels, high and low. When the temperature is set to high, strong heating is performed, and when the temperature is set to low, weak heating is performed. In the present embodiment, a heat exchanger (cooler) cooled by a refrigerant is provided upstream of the radiator, and can be used as a cooler in summer, and also used as a dehumidifier by using the radiator and the cooler simultaneously. can do. When used as a dehumidifier, the radiator is operated under the same conditions as for weak heating. Then, the condensed water that passes through the radiator and gives heat to the air blown from the fan to lower the temperature is returned to the gas water heater 1 via the return path b1. The recirculated condensate is heated again by the gas water heater 1 and sent out as primary hot water from the forward path f1, while a part of the condensate before being heated is branched as secondary hot water to the forward path f2 and further separated into the separator S Diverges into a forward path f3 and a forward path f4. After each of the outgoing routes f3 and f4 are supplied to the hot water mats Fa and Fb to perform floor heating, they are returned to the gas water heater 1 as condensed water through the return route b1. In addition, when performing additional reheating of the bath, a circulation path different from the primary hot water for the air conditioner A and the secondary hot water for the hot water mats Fa and Fb is provided, and the hot water in the bathtub B is returned via the return path b2. The hot water sucked from the bath tub is heated through a liquid-liquid heat exchanger, which will be described later, using a part of the primary hot water sucked and sent to the air conditioner A, and the heated hot water is returned into the bath tub through the forward path f5. In addition, D is a room temperature sensor as room temperature detection means, which detects the temperature in the room where the hot water mats Fa and Fb are provided.

Referring to FIG. 2, a heat exchanger 11 using a burner 10 as a heat source is provided in gas water heater 1, and hot water circulated by pump 2 is passed through heat exchanger 11 by burner 10. Is heated and becomes primary warm water, and is supplied from the pipe 12 to the outward path f1. The condensed water returned through the return path b1 enters the cistern 3 once, and then returns to the pump 2
Is sucked. By the way, the condensate discharged from the pump 2 returns to the heat exchanger 11 through the pipe 13,
Part of the condensed water is diverted to the pipe 14 as secondary hot water and
2 and reaches separator S. In addition, the temperature of the primary hot water is detected by a temperature sensor 5H provided in the pipeline 12,
The temperature of the secondary hot water is measured by a temperature sensor 5L provided in the line 14.
, And the detection signals of both temperature sensors 5H and 5L are both sent to the control device 5. In the separator S, the forward path f
The control device 5 provided in the gas water heater 1 is provided with thermal on-off valves Va and Vb corresponding to 3 · f4.
, The entrances of the forward routes f3 and f4 can be individually opened and closed to cut off the supply of the secondary hot water to the hot water mats Fa and Fb. The on-off valves Va and Vb each include a wax pellet and a heater for heating the wax pellet. The valve is opened by pushing the valve rod with a rod of wax pellets integral with the piston. Condensed water coming out of the warm water mats Fa and Fb returns to the cistern 3 through the return path b1. By the way, the forward path f1 and the return path b1 are communicated with each other by a bypass BP. When the proportional control valve in the air conditioner A is closed to stop the operation of the air conditioner A and operate the floor heating alone, ,
The primary hot water flows directly to the cistern 3 through the bypass BP, and a part of the primary hot water flows to the hot water mats Fa and Fb as secondary hot water so that the sole heating of the floor heating can be performed. The cistern 3 is provided with an electrode 31 for detecting a high water level and an electrode 32 for detecting a low water level. When the water amount of the cistern decreases and the water surface moves away from the lower end of the electrode 32, the electrode 31 Tap water is supplied through the water supply pipe 33 until the water surface comes into contact with the tip of the electrode 31, and even if the water surface in the cistern 3 overflows beyond the lower end position of the electrode 31, excess water or hot water flows through the drain pipe 34. Is discharged.

A portion of the primary hot water is diverted from the middle of the pipe 12 to the liquid-liquid type heat exchanger 4, and the primary hot water is introduced into the inlet of the primary hot water. A thermodynamic on-off valve Vc is provided. The on-off valve Vc is opened by receiving a control signal from the control device 5 only when the hot water in the bathtub B is additionally heated. The heat exchanger 4 has a pump 4
The hot water in the bathtub B is circulated by 0, but when adding hot water or filling hot water, hot water is separately supplied from a hot water heater (not shown) via the pipe 41, and the heat exchanger 4 and the forward path f5 and the return path are provided. It is supplied into the bath B through b2. Reference numeral 42 denotes a normally-closed on-off valve, which is opened when hot water is supplied into the bathtub B via the conduit 41, and the hot water passing through the on-off valve 42 passes through the check valve 43 and the flow meter 44. The water is supplied into the bathtub B through the tub. Reference numeral 45 denotes a water flow switch, which detects that hot water from the return path b2 due to the operation of the pump 40 is actually flowing into the heat exchanger 4, and always operates the pump 40 only when there is hot water in the bathtub B. This prevents the pump 40 from being damaged or noise caused by idling.

Incidentally, the burner 10 must have a maximum combustion amount capable of simultaneously performing heating using the air conditioner A and the hot water mats Fa and Fb and additional heating of hot water in the bathtub B. Assuming that the maximum combustion amount of the burner 10 exhibited when the proportional control valve 10a is fully opened is 100%, FIG.
As shown in a, when the simultaneous operation of the heating operation and the additional heating operation of the bath is started, the temperature of the hot water circulating through the heat exchanger 11 is low, so that the primary hot water is supplied to the pipe 12. It burns at the maximum burn rate. When the combustion at the maximum combustion amount continues and the temperature of the reflux water (heat medium) flowing into the heat exchanger 11 increases, the temperature of the primary hot water also increases. When the temperature rise of the primary hot water is detected by the temperature sensor 5H, the control device 5 reduces the gas supply amount to the burner 10 so that the temperature of the primary hot water becomes constant at a predetermined temperature (for example, 80 ° C.).
Reduce the amount of combustion. Finally, combustion is continued in a state where the amount of heat and the amount of heat radiation are balanced at a combustion amount of 70% of the maximum combustion amount, for example.

Next, for example, when only heating is performed, the on-off valve Vc is closed so that the primary hot water is not branched into the heat exchanger 4. Then, since heat is not dissipated in the heat exchanger 4, the amount of heat dissipated in the primary warm water decreases, and the temperature of the reflux water (heat medium) rises rapidly. Accordingly, as shown in FIG. 3B, the combustion amount starts to decrease in a shorter time than in the case of the above-mentioned a, and the combustion amount of the burner becomes shorter than the time Ta in the case of the above-mentioned a after the start of operation.
Then, the combustion is reduced to, for example, 40% of the maximum combustion amount and the combustion is continued. However, when the heating alone is operated, the combustion amount of the burner is reduced to a predetermined combustion amount lower than the maximum combustion amount (in the case of the present embodiment, the maximum combustion amount of 40) earlier than the case indicated by a.
%) To continue burning.
It is more desirable to reduce the combustion noise generated during combustion at the maximum combustion amount than to reduce the combustion amount early. Therefore, in such a heating only operation that does not require the maximum combustion amount, if the signal output to the proportional control valve 10a becomes a signal corresponding to a predetermined opening smaller than the full opening in the control device 5, the opening is further increased. Is provided with a limiting circuit for preventing the output of the signal for increasing the value of the burner 1 as shown in FIG.
The upper limit of the combustion amount of 0 is lower than the maximum combustion amount, for example, 80%
Limit the amount of combustion. Thus, even if the upper limit of the combustion amount of the burner 10 is limited to 80% of the maximum combustion amount, the maximum combustion amount is 4%.
The time Tc required to decrease to 0% is substantially the same as Ta, and the upper limit of the combustion amount of the burner 10 is limited to 80%, so that the combustion noise is reduced.

Although the above embodiment has been described with respect to the case where the heating operation is performed alone, the upper limit of the burner combustion amount is similarly limited to, for example, 80% of the maximum combustion amount when the additional heating operation is performed alone. However, when there is a request to perform reheating in a short time, the upper limit of the burner combustion amount is limited only in the heating operation alone, and the upper limit of the burner combustion amount is not limited to the maximum combustion amount in the reheating operation alone. You may do so.

[0013]

As is apparent from the above description, the present invention limits the upper limit of the burner combustion amount to a predetermined combustion amount lower than the maximum combustion amount as necessary, so that the combustion noise is reduced as much as possible. Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection state between a water heater and peripheral devices.

FIG. 2 is a diagram showing a pipe state in a water heater.

FIG. 3 is a diagram showing a change over time in a burner combustion amount;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas water heater 2 Pump 3 Systern 4 (Liquid-liquid type) heat exchanger 5 Controller 5H (Primary hot water side) Temperature sensor 5L (Secondary hot water side) Temperature sensor A Air conditioner B Bathtub D Room temperature sensor Fa Hot water Mat Fb Hot water mat S Separator

Claims (1)

(57) [Claims] 1. A with one of <br/> hot water to circulate while being heated by a burner is used as heat medium subjected to the hot water heating and bath heated at the same time, or hydronic heating system that may perform only one of The amount of combustion of the burner is
The temperature of the hot water is controlled by a proportional control valve
In what controlled to be constant temperature, in the case of only one of the above water heating and bath heating, the upper
When the proportional control valve is over the specified opening that is set narrower than full open
Hot water provided with combustion amount limiting means for preventing the burner from opening and limiting the upper limit of the amount of combustion of the burner to a predetermined amount of combustion lower than the maximum amount of combustion when simultaneously performing hot water heating and bath heating. Circulation heater.