JPS587142B2 - heating water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an integrated heating and hot water supply device whose heating capacity does not decrease even during hot water supply.

In conventional heating and hot water supply apparatuses of this type, the heating effect decreases during large-volume hot water supply or continuous hot water supply, and the hot water supply temperature inevitably decreases gradually.

That is, FIGS. 1A to 1C show a conventional heating and hot water supply device of an integrated structure that exchanges heat between cold water for hot water supply and hot water for heating.
Depending on the heating method, hot water generators for space heating are classified into hot water storage type A, instantaneous outlet type, and circulation type C, but since the heating method for hot water supply is the same, the main components that perform the same function are the same. The three types of devices will be collectively explained using reference numerals.

To explain this device by dividing it into a heating system and a hot water supply system, first, in the case of the heating system, the tank A1 (Fig. A) or When the circulation pump e starts, hot water from the heat exchanger a2 (opening diagram) or tank b (c diagram) flows into the heating outgoing pipe c1 radiator (
(not shown) and a heating return pipe d so as to circulate as shown by solid arrows.

The temperature of the returned hot water drops due to the heat radiated from the radiator, so it is heated by the burner t and reaches a predetermined temperature. ) to maintain the steady state of the heating system by operating continuously or intermittently.

Next, the hot water supply system is configured to reach the required number of hot water taps p via a water supply pipe m, an endothermic coil n that is indirectly heated by the heating hot water, and a hot water outlet pipe 0, as shown by the broken line arrow.

Therefore, when hot water is supplied during the heating operation, cold water from the water supply pipe m flows through the system when the hot water tap p is opened, and heat is continuously removed from the heating hot water in the heat absorption coil n.

If this hot water is supplied for a long time or in large quantities, the burner
Unless the heating capacity of the heating system is increased to accommodate hot water supply, the heating system will not be able to maintain a steady state, and the heating effect will gradually decrease.

That is, the temperature of the water in tank a1, heat exchanger a2, or tank b falls below a predetermined temperature.

Accompanying this phenomenon, the heat absorption effect of the heat absorption coil n also decreases.

Although it is not technically impossible to provide the burner t with a variable capacity in order to deal with the above phenomenon, it would complicate the control device and burner t configuration and increase costs, so this type of heating and hot water supply for residential use In the device, the heating outgoing pipe C and heating return pipe d of the heating circuit are connected by a bypass g via a three-way valve f, and the hot water supply operation is linked with the three-way valve f to short-circuit the heating circuit when supplying hot water to the tank a1 or A mechanism is adopted to measure the recovery of the water temperature in heat exchanger a2 or tank b.

For this reason, heating is stopped or the heating capacity is reduced during hot water supply.

The reason for adopting this mechanism seems to be to avoid the above-mentioned complexity of the configuration and the accompanying cost increase, and also based on the idea that hot water will be supplied in a small amount or for a short time.
This is not a satisfactory function for users.

In addition, in Fig. 1 A and 1, h is the water supply expansion pipe, and l is the water supply expansion pipe.
is a water pipe.

In Figure 1C, a3 is a heat exchanger, i is a water level detector,
J is a water pipe.

The present invention aims to solve the above-mentioned drawbacks of the conventional example and to perform heating and hot water supply without reducing the respective effects by adding a simple device.

In order to achieve the above-mentioned object, the present invention provides an integrated heating and hot water supply system that exchanges heat between cold water for hot water supply and hot water for heating, in which a pre-heat absorption section is provided upstream of the heat absorption coil in the hot water supply path. The heat absorption part is heated by an auxiliary burner, and the auxiliary burner is configured to be automatically combusted when water is flowing in the hot water supply path.

Next, an embodiment of the heating and hot water supply apparatus of the present invention will be described with reference to FIGS. 2 and 3.

Fig. 2 shows an embodiment in which the present invention is applied to the hot water storage type shown in Fig. 1 A, and Fig. 3 shows an embodiment in which the present invention is applied to the instantaneous type shown in Fig. 1. The circulation system and the dashed arrow indicate the hot water supply system, respectively.

Components that perform the same functions in FIGS. 2 and 3 will be described using the same names and numerals.

1a is a hot water storage tank, 1b is a heat exchanger, and 2 is the hot water storage tank 1a (
or a heating outgoing pipe led out from the heat exchanger 1b), 3 a heating return pipe connected downstream of a radiator (not shown), 4 a check valve, and 5 a circulation pump. A forced circulation circuit for hot water is constructed.

6 is a three-way valve that has a flow path switching or flow rate adjustment function;
It is inserted near the hot water generator of the heating outgoing pipe 2.

7 is a bypass pipe connecting one flow path of the three-way valve 6 and a pipe line between the check valve 4 of the heating return pipe 3 system and the circulation pump 5; 8 is a water supply expansion pipe; and 9 is a bypass pipe. Water supply expansion tank, 1
0 is a water pipe, and 11 is a ventilation pipe.

12 is a water supply pipe for hot water supply; 13 is a heat absorption coil disposed in the hot water storage tank 1a (or heat exchanger 1b); 14 is a pre-heat absorption part that connects the water supply pipe 12 and the heat absorption coil 13; 1a (or heat exchanger 1b).

15 is a hot water supply pipe led out from the heat absorption coil 13 and reaches the hot water tap 16, and 17 is a ventilation pipe.

The hot water supply system is constituted by the elements indicated by numerals 12 to 17 above.

18 is a gas supply pipe that delivers gas to the main burner 19, the auxiliary burner 20, and the pilot burner 21.

The structure for operating and controlling the main burner 19 and the pilot burner 21 is a conventionally well-known technique, so a description thereof will be omitted.

The auxiliary burner 20 is arranged to heat the preheat absorption section 14, and the gas supply stop is controlled by a controller 22.

The controller 22 is, for example, a known hydraulically responsive automatic valve that detects flowing water in the hot water supply path and supplies gas to the auxiliary burner 20.

23 is a combustion chamber.

The operation of the heating and hot water supply apparatus of the present invention having the above configuration will be described below, but the operation of the hot water generating section and the heating circulation system will be omitted since they are well known, and hot water supply during heating operation will be described in detail.

When the hot water tap 16 is opened to supply hot water, a flow of water occurs in the hot water supply line, and cold water flows from the water pipe 10 to the hot water tap 16 via the water supply pipe 12, the preheat absorption section 14, the heat absorption coil 13, and the hot water pipe 15. reach.

This flowing water activates the controller 22 to automatically send gas to the auxiliary burner 20, which is ignited by the starter burner 21 and starts combustion. Heat 14.

The cold water that has absorbed a considerable amount of heat in the preheat absorption section 14 then absorbs heat from the heating hot water while passing through the heat absorption coil 13 to become hot water at a predetermined temperature, and is discharged from the hot water tap 16.

When the hot water tap 16 is closed after hot water supply, the auxiliary burner 20 stops combustion by the operation of the controller 22.

When supplying hot water while heating is stopped or paused, switch the three-way valve 6 to short-circuit the heating circuit through the bypass pipe T and operate the hot water generating section. The above-mentioned hot water supply/stop function can be performed by the operation 16.

As described above, the present invention provides an integrated heating water heater that exchanges heat between cold water for hot water supply and hot water for heating, in which a preheat absorption section is provided upstream of the heat absorption coil in the hot water supply path, and the preheat absorption section is assisted. It should be heated with a burner, and
The auxiliary burner is configured to automatically burn when water is flowing through the hot water supply route, so when the hot water tap is opened to start hot water supply, the auxiliary burner is automatically combusted to preheat the cold water for hot water supply, then heat the hot water for heating. will be replaced, and for this reason,
Since the amount of heat exchange between hot water for heating and hot water for hot water supply is small, there is no need to stop or throttle heating during hot water supply as in conventional devices, and heating can continue.

Further, even when hot water is supplied in large quantities or for a long period of time, there is no inconvenience that the temperature of the hot water gradually decreases while heating is continued.

It goes without saying that the present invention is not limited to the above-described embodiments, and can be widely applied to other hot water supply and heating apparatuses that exchange heat between cold water for hot water supply and hot water for heating, including the circulation type shown in FIG. stomach.

[Brief explanation of the drawing]

FIGS. 1A to 1C are schematic configuration diagrams of a conventional integrated heating and hot water supply device that performs the functions of heating and hot water supply; FIG. FIG. 3 is a schematic configuration diagram showing another embodiment of the present invention. 1a... hot water storage tank, 1b... heat exchanger,
10... Water pipe, 12... Water supply pipe, 1
3... Heat absorption coil, 14... Preheat absorption section, 15... Hot water supply pipe, 16... Hot water tap,
19... Main burner, 20... Auxiliary burner, 21... Funeral burner, 22... Controller.

Claims (1)

[Claims] 1. In an integrated heating and hot water supply system that exchanges heat between cold water for hot water supply and hot water for heating, a preheat absorption section is provided upstream of the heat absorption coil in the hot water supply path, and the preheat absorption section is heated by an auxiliary burner, and A heating and hot water supply device characterized in that an auxiliary burner is configured to automatically burn when water is flowing in a hot water supply path.