JPH08296902A - Heat source unit for supply water heating - Google Patents

Abstract

PURPOSE: To prevent the freezing of a cold water pipe and a hot water pipe from occurring by circulating hot water for heating heated by a hot water supply section for heating to a heating bypass contacting the cold water pipe and the hot water pipe at a supply water heating section. CONSTITUTION: A normal supply water heating operation is performed by passing water through a supply water heating heat exchanger 23 and a heating operation by actuating a heating heat exchanger 25 and a hot water circulation pump 39 to circulate hot water for heating to a heat radiator 26. A hot water outcoming pipe 27 and a hot water return pipe 28 are kept in contact with a cold water pipe 22 and a hot water pipe 24 while a heating bypass pipe 29 contacts the pipes. Water in the cold water pipe 22 and in the hot water pipe 24 is heated by heat of the hot water for heating. As a result, even when the temperature of outside air is low, the freezing of the cold water pipe 22 and the hot water pipe 24 can be prevented. In addition, at the start of heating supply cold water, the water within the water pipe 22 and the hot water pipe 24 is preheated thereby checking the supply of the chilled water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a house to supply hot water to a kitchen, a washroom, a bathroom, etc. provided inside the house, and to dissipate heat inside the house. The present invention relates to a hot water supply and heating heat source device configured to supply hot water for heating to a heating device such as a water heater and a hot water mat.

[0002]

2. Description of the Related Art Conventionally, as this type of heat source device for hot water supply and heating,
The structure shown in FIGS. 2 and 3 is known.

A heat source unit for hot water supply and heating (hereinafter referred to as a heat source unit) indicated by reference numeral 1 in FIG. 2 is a casing 2, a hot water supply heat exchanger 3 provided in the casing 2, and a heating heat exchanger. 4, a water supply pipe 5 for supplying water to the hot water supply heat exchanger 3, a hot water supply pipe 6 for supplying hot water from the hot water supply heat exchanger 3 to a faucet in a house, and hot water for heating from the heating heat exchanger 4. Hot water outflow pipe 7 for sending to indoor heating equipment (not shown)
And the hot water for heating from the heating device to the heating heat exchanger 4
The hot water return pipe 8 for returning to the hot water return pipe 8 and the heating bypass pipe 9 provided so as to communicate with the hot water return pipe 7 and the hot water return pipe 8 are provided.

The conventional heat source device 1 thus constructed is attached to the outer wall W of the house as shown in FIG. 3, and the casing 2 is, as shown in FIG. 2 and FIG. The two heat exchangers 3 and 4 are installed in the upper compartment 2a, which is divided into two upper and lower parts via a partition wall 10.

Further, the water supply pipe 5, the hot water supply pipe 6, the hot water outflow pipe 7, and the hot water return pipe 8 are respectively provided in the partition wall 1.
The partition 0 is divided into upper and lower parts, and the partition wall 10
It is unified by a plurality of couplers 11 attached to the lower surface of the.

Further, the water supply pipe 5, the hot water supply pipe 6, the hot water outflow pipe 7, and the hot water return pipe 8 are respectively curved toward the wall W in the compartment 2b below the casing 2. It is piped into the room through a through hole 12 formed in the wall W.

In the conventional heat source unit 1 having such a structure, at the time of hot water supply, after the water supplied from the water supply pipe 5 is heated in the hot water supply heat exchanger 3, the hot water is supplied to various places in the room via the hot water supply pipe 6. Also, during heating, the heating heat exchanger 4
The hot water for heating heated in the above is supplied to the heating equipment via the hot water outflow pipe 7, and the hot water for heating is recovered from this heating equipment by the hot water return pipe 8 to obtain the heating heat exchanger 4
It is designed to be heated by circulating it to.

Further, when the heating is stopped, or when the set temperature of the heating is low, the surplus hot water for heating is directly sent from the hot water outflow pipe 7 to the hot water return pipe 8 by the heating bypass pipe 9. There is.

[0009]

By the way, in the conventional heat source device 1 as described above, the following problems to be improved remain.

That is, the compartment 2 above the casing 2
In a, even when the heating is stopped, the heating heat exchanger 4 for heating the heating hot water is intermittently operated due to the circulation of the heating hot water in the heating bypass pipe 9, and the internal temperature reaches a certain temperature. In the lower compartment 2b, which is held but is separated from the upper compartment 2a, the internal temperature thereof is substantially equal to the outside air.

While the hot water supply operation is stopped, the water supply pipe 5 and the hot water supply pipe 6 located in the lower compartment 2b are exposed to the outside air.
It is assumed that the water in the water supply pipe 5 or the hot water supply pipe 6 is frozen in a state where the outside air is extremely low, such as in winter.

Even before freezing, the water temperature in the water supply pipe 5 and the hot water supply pipe 6 is lowered, so that low-temperature water is supplied until a certain time elapses from the restart of hot water supply. There is also.

The present invention has been made in view of the above-mentioned conventional problems, and it is a first object of the present invention to provide a heat source unit for hot water supply and heating capable of preventing the water supply pipe and the hot water supply pipe from freezing.

A second object of the present invention is to provide a heat source device for hot water supply and heating capable of minimizing the supply of low temperature water at the start of hot water supply.

[0015]

In order to achieve the above-mentioned first and second objects, a heat source machine for hot water supply and heating according to claim 1 of the present invention and a hot water supply section for heating and these. A heat source device for hot water supply and heating provided with a casing provided to cover the hot water supply unit, wherein the hot water supply unit, a hot water supply heat exchanger for heating water supplied by the water supply pipe, and the hot water supply heat exchanger. The heating hot water supply unit is composed of a hot water supply pipe for discharging heated hot water, and the heating heat exchanger for heating the heating hot water, and the heating heat exchanger to a radiator installed in the room. It consists of a hot water outflow pipe that supplies hot water for heating, a hot water return pipe that returns the hot water for heating from the radiator to the heating heat exchanger, and a heating bypass pipe that connects these hot water outflow pipes and the middle of the hot water return pipe. And the water supply pipe and hot water supply pipe A part of the hot water outflow pipe and the hot water return pipe is located outside the casing, and the heating bypass pipe is brought into contact with the water supply pipe and the hot water supply pipe exposed from the casing. It is characterized in that it is arranged in a state.

In order to achieve the above-mentioned first and second objects, the heat source device for hot water supply and heating according to a second aspect of the present invention has the water supply pipe, the hot water supply pipe, and the hot water outflow pipe according to the first aspect. , And the hot water return pipe are arranged in contact with each other at a position exposed from the casing.

Further, in the heat source device for hot water supply and heating according to claim 3 of the present invention, the hot water supply part for heating according to claim 1 or 2 detects the hot water temperature in the hot water return pipe, Control means for controlling the operation of the heating hot water supply unit based on the detection result is provided.

[0018]

According to the heat source device for hot water supply and heating according to the first aspect of the present invention, the hot water for heating heated in the hot water supply unit for heating is circulated through the heating bypass pipe, and the heating bypass pipe is By being in contact with the hot water supply pipe or the hot water supply pipe of the hot water supply unit, the heat of the hot water for heating flowing in the heating bypass pipe passes through the heating bypass pipe wall and the water supply pipe or the hot water supply pipe wall. It is transmitted to the water in these water supply pipes and hot water supply pipes.

As a result, the water in the water supply pipe or the hot water supply pipe is heated to prevent it from freezing or to maintain it at a certain temperature, thereby suppressing discharge of cold water at the start of hot water supply.

Further, according to the heat source device for hot water supply and heating according to the second aspect of the present invention, since the hot water supply pipe and the hot water return pipe are arranged in contact with the water supply pipe and the hot water supply pipe, the heating bypass is provided during heating. Even if the amount of heating hot water flowing in the pipe decreases, the temperature of the water in the water supply pipe or the hot water supply pipe is prevented from decreasing due to the heat from the hot water outflow pipe or the hot water return pipe.

Further, according to the heat source device for hot water supply and heating according to the third aspect of the present invention, the operation of the heating hot water supply unit is controlled based on the heating hot water temperature in the hot water return pipe, so that the heating bypass is provided. The hot water temperature for heating in the pipe, the hot water inflow pipe, or the hot water return pipe is accurately controlled, and thus the decrease in the water temperature in the water supply pipe or the hot water supply pipe is reliably suppressed.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 20 denotes a heat source device (for hot water supply and heating) according to the present embodiment. The heat source device 20 includes a hot water supply part 20a, a hot water supply part 20b for heating, and a casing provided to cover these parts. 21, the hot water supply unit 20a
Is a water supply pipe 22, a hot water supply heat exchanger 23 for heating water supplied by the water supply pipe 22, and a hot water supply heat exchanger 2
3, a hot water supply pipe 24 for discharging hot water heated by 3, and the heating hot water supply unit 20b heats the heating hot water by a heating heat exchanger 25 and the heating heat exchanger 2
5, hot water outflow pipe 27 for supplying hot water for heating to radiator 26 installed in the room, hot water return pipe 28 for returning hot water for heating from radiator 26 to heating heat exchanger 25, and hot water outflow of these The water supply pipe 2 is composed of a pipe 27 and a heating bypass pipe 29 that connects the middle of the hot water return pipe 28 to each other.
2, a part of the hot water supply pipe 24, the hot water outflow pipe 27, and the hot water return pipe 28 are located outside the casing 21, and the water supply pipe 22 and the hot water supply pipe exposed from the casing 21. The heating bypass pipe 29 is placed in contact with the heating bypass pipe 24.

Next, the details thereof will be explained. In the casing 21, the hot water supply heat exchanger 23 is provided.
And the heating heat exchanger 25 are arranged in parallel, and each of the hot water supply heat exchanger 23 and the heating heat exchanger 25 are
Heat exchange finned tubes 23a, 25a and burner 23 installed below the finned tubes 23a, 25a
b / 25b and each of these finned tubes 23a / 25a
Also, the combustion chamber 23 is provided so as to surround the burners 23b and 25b and surrounds the finned tubes 23a and 25a.
It is constituted by the hoods 30 and 31 forming the c and 25c.

The gas supply pipe 3 drawn into the casing 21 is provided in each of the burners 23b and 25b.
3 are branched and connected to each of the hoods 30.
1 are connected by a duct 34.

The downstream end of the duct 34 penetrates the upper portion of the casing 21 and communicates with the outside. In the middle of the duct, combustion air is sucked into the combustion chambers 23c and 25c. Moreover, a ventilation fan 35 for discharging the combustion gas generated in each of the combustion chambers 23c and 25c to the outside air is attached.

Further, an intake port 36 for communicating the inside and outside of the casing 21 is formed in the upper portion of the casing 21 in the vicinity of the portion where the duct 34 penetrates.

In the present embodiment, the water supply pipe 22, the hot water supply pipe 24, the hot water outflow pipe 27, and the hot water return pipe 28 are projected from the lower portion of the casing 21 to the outside, and then the casing 21 is attached. Although it is drawn into the house through the outer wall W of the existing house, the parts projected from the casing 21 to the outside are in parallel with each other and are in contact with each other. The pipes are installed in a fixed condition.

The heating bypass pipe 29 extends along one side of the hot water outflow pipe 27 toward the contact portion, and then, on both sides of the hot water supply pipe 24, on both sides of the water supply pipe 22, It is routed along one side of the hot water supply pipe 24, one side of the hot water outflow pipe 27, and one side of the hot water return pipe 28, and each of these water supply pipes 22, hot water supply pipes 24, hot water The forward pipe 27 and the hot water return pipe 28 are in contact with each other at a portion thereof.

On the other hand, in the middle of the hot water return pipe 28, an expansion tank 37 for absorbing a volume change due to a temperature change of the hot water for heating is provided.
Are communicated with the outside of the casing 2 via a drain pipe 38.

The heating heat exchanger 25 is provided downstream of the expansion tank 37 and between the heating heat exchanger 25.
A hot water circulation pump 39 for circulating the hot water for heating is provided between the heat radiator 26 and the radiator 26.

Further, in the present embodiment, a thermistor or the like for detecting the temperature of the hot water flowing in the hot water return pipe 28 is provided in the portion of the hot water return pipe 28 located upstream of the expansion tank 37. Is provided with a temperature detector 40, and the temperature detector 40 includes the temperature detector 4
A control unit that adjusts the temperature of the heating hot water by controlling the operation of the heating heat exchanger 25 and the hot water circulation pump 39 based on the comparison between the detection result from 0 and the preset temperature. 41 are connected, and the temperature detector 40 and the control unit 41 constitute the control means in this embodiment.

The heat source unit 2 of this embodiment having the above-mentioned structure
No. 0 indicates that normal hot water supply operation is performed by passing water to the hot water supply heat exchanger 23, and the heating heat exchanger 25 and the hot water circulation pump 39 are operated to circulate hot water for heating to the radiator 26. The heating operation is performed.

In the present embodiment, the water supply pipe 22
The hot water outflow pipe 27 and the hot water return pipe 28 are brought into contact with the hot water supply pipe 24 and the heating bypass pipe 29 is brought into contact therewith, so that the heating operation is performed. When the hot water supply operation is stopped while the hot water supply pipe 22 and the hot water return pipe 28 and the heating bypass hot water flowing in the heating bypass pipe 29 are heated, The water is heated.

This prevents freezing of the water supply pipe 22 and the hot water supply pipe 24 even when the outside air temperature is low, such as in winter, and preheats the water in the water supply pipe 22 and the hot water supply pipe 24 at the start of hot water supply. Therefore, the supply of cold water is suppressed.

Even when the heating is stopped, the hot water for heating is circulated in the heating bypass pipe 29, so that the water supply pipe 22 is supplied by the heating bypass pipe 29.
And the water in the hot water supply pipe 24 is heated to ensure the above-described action.

In this embodiment, since the temperature inside the hot water return pipe 28 is controlled by the action of the temperature detector 40 and the control unit 41, the water supply pipe 22 is maintained even when the heating is stopped as described above. The water inside the hot water supply pipe 24 is reliably heated.

The shapes, sizes, etc. of the respective constituent members shown in the above embodiment are merely examples, and can be variously changed based on design requirements and the like.

For example, in the above-mentioned embodiment, each pipe is configured to be brought into direct contact with the outside air, but the surface of these pipes may be covered with a heat insulating material.

With such a structure, the antifreezing action of the water supply pipe 22 and the hot water supply pipe 24 described above and the effect of suppressing the supply of cold water at the start of hot water supply are further improved.

Also, an example in which the hot water outflow pipe 27 and the hot water return pipe 28 are brought into contact with the water supply pipe 22 and the hot water supply pipe 24 has been shown, but it is also possible to have a configuration in which only the heating bypass pipe 29 is brought into contact.

[0042]

As described above, according to the first aspect of the present invention.
According to the heat source device for hot water supply and heating according to the above, the hot water for heating heated in the hot water supply unit for heating is circulated to the water supply pipe of the hot water supply unit or the heating bypass pipe in contact with the hot water supply pipe, thereby The water in the water supply pipe or the hot water supply pipe is heated through the wall of the bypass pipe and the wall of the water supply pipe or the hot water supply pipe to prevent freezing of the water supply pipe or the hot water supply pipe, or to supply hot water. The discharge of cold water at the start can be suppressed.

Further, according to the heat source device for hot water supply and heating according to the second aspect of the present invention, the inside of the heating bypass pipe is heated at the time of heating by keeping the hot water supply pipe and the hot water return pipe in contact with the water supply pipe and the hot water supply pipe. Even if the amount of heating hot water flowing decreases, the heat transferred from the hot water outflow pipe and the hot water return pipe causes
It is possible to prevent water from freezing by heating the water in the water supply pipe or the hot water supply pipe, and reliably secure the preheating function of water at the start of hot water supply.

Further, according to the heat source device for hot water supply and heating according to the third aspect of the present invention, the control means controls the operation of the hot water supply for heating based on the hot water temperature for heating in the hot water return pipe. By properly maintaining the temperature of hot water for heating in the heating bypass pipe or hot water outflow pipe or hot water return pipe,
It is possible to reliably prevent the water supply pipe and the hot water supply pipe from freezing and to suppress the supply of low-temperature water at the start of hot water supply.

[0045]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view showing a structural example of a conventional hot-water supply / heating heat source device.

FIG. 3 is a side view showing a structural example of a conventional hot-water supply / heating heat source device.

[Explanation of symbols]

 20 (For Hot Water Supply / Heating) Heat Source Machine 20a Hot Water Supply Unit 20b Heating Hot Water Supply Unit 21 Casing 22 Water Supply Pipe 23 Hot Water Heat Exchanger 24 Hot Water Supply Pipe 25 Heating Heat Exchanger 26 Radiator 27 Hot Water Forward Pipe 28 Hot Water Return Pipe 29 Heating Bypass Pipe 40 Temperature Detector (Control Means) 41 Control Unit (Control Means)

Claims (3)

[Claims] 1. A heat source machine for hot water supply and heating, comprising: a hot water supply unit, a hot water supply unit for heating, and a casing provided to cover these units, wherein the hot water supply unit is a water supply pipe and water supplied by the water supply pipe. And a hot water supply pipe for discharging hot water heated by the hot water supply heat exchanger, and the heating hot water supply section, a heating heat exchanger for heating the heating hot water, A hot water outflow pipe for supplying hot water for heating from this heating heat exchanger to a radiator installed indoors, a hot water return pipe for returning the hot water for heating from the radiator to the heating heat exchanger, and these hot water outflow pipes And a heating bypass pipe communicating the middle of the hot water return pipe, and the water supply pipe, the hot water supply pipe, the hot water return pipe, and a part of the hot water return pipe are located outside the casing. , This casing A hot-water supply / heating heat source device, wherein the heating bypass pipe is arranged in contact with the water supply pipe or the hot water supply pipe exposed from the above. 2. The water supply pipe, the hot water supply pipe, the hot water supply pipe, and the hot water return pipe are arranged in a state of being in contact with each other at a position exposed from the casing. The heat source device for hot water supply and heating according to claim 1. 3. The heating hot water supply unit is provided with control means for detecting the hot water temperature in the hot water return pipe and controlling the operation of the heating hot water supply unit based on the detection result. The heat source device for hot water supply and heating according to any one of claims 1 and 2.