JPH0436301B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water circulation type heating device that heats hot water with saturated steam and uses the saturated steam as a circulating energy source for the hot water.

[Prior Art] A hot water heater configured to circulate hot water in a radiator and heat the hot water using steam ejection energy is known (Japanese Utility Model Publication No. 59-43826).

[Problems with the Prior Art] However, in the case of the above-mentioned known example, how the hot water is returned between the water storage tank 5 and the heat exchanger 1 is incomplete in principle, and there is a drawback that it cannot be put into practical use. be.

An object of the present invention is to provide a hot water circulation type heating device that can circulate and heat water using steam energy to perform space heating.

[Means to solve the problem] The configuration of the present invention is as follows.

a sealed steam generator filled with a working fluid; a low level detection sensor for detecting a low level of the working fluid in the steam generator; and a high level of the working fluid in the steam generator. a high liquid level detection sensor for detecting the liquid level; a burner for heating the working fluid in the steam generator to generate saturated steam in the steam generator; Connect the fuel valve and the inlet side of the radiator to the mixing discharge port, connect the outlet side of the radiator to the neck via a return pipe, and connect the jet nozzle for spouting the steam generated by the steam generator to the neck. an ejector facing the radiator, an expansion tank that is open to the atmosphere and connected to a return pipe between the outlet side of the radiator and the ejector, and a fuel valve that closes the fuel valve when the low liquid level detection sensor detects a low liquid level. , a control circuit that controls opening of a fuel valve when a high liquid level detection sensor detects a high liquid level; and a hot water circulation type heating device.

[Operation] When the saturated steam generated in the steam generator is ejected from the nozzle into the ejector, the suction action of the neck due to the ejection energy causes a circulation effect on the hot water in the radiator, and the hot water coming out of the radiator flows into the ejector. Mix with saturated steam at Due to this effect,
The hot water is heated to heating temperature by the latent heat of the steam and the sensible heat based on the temperature difference between the hot water and the hot water after mixing, and is again supplied to the radiator side.

Heating continues as described above, and when the working fluid in the steam generator decreases and the low fluid level detection sensor detects this, the control circuit closes the fuel valve and stops heating. The steam generator is cooled by this heating stop, and this action causes the steam in the steam generator to condense, creating a vacuum inside the steam generator. When a vacuum is created in this way, the water in the expansion tank at atmospheric pressure is supplied into the steam generator at a differential pressure, and when the high liquid level detection sensor detects that a predetermined amount of working fluid has been supplied, the control is controlled. The circuit opens the fuel valve and starts heating again, producing steam and repeating the process to create space. Note that the operation of the radiator will be interrupted while water is being supplied from the expansion tank, but this will last for several tens of minutes.
It takes only seconds, and is not enough to cause any problems with heating.

[Example] 1 is a gas burner for heating a sealed steam generator 2 to heat the internal working fluid (water); 3 is a gas burner for heating the internal working fluid (water); 5 is a hot water outgoing pipe connecting the mixer 4' of the ejector 4 and the inlet of the radiator 6, and 7 is a return pipe, and this return pipe 7 is connected to the neck 4'' of the ejector 4. ing. A is a hot water circulation circuit from the ejector 4 to the outgoing pipe 5 to the radiator 6 to the return pipe 7 to the neck 4'' of the ejector 4.

8 is an expansion tank connected to the return pipe 7 of the hot water circulation circuit a and is open to the atmosphere, and 9 is a temperature sensor installed near the mixing section 4' of the ejector 4.

A low water level detection sensor 10 detects a low water level in the steam generator 2, and stops the gas burner 1 when a low water level is detected.

Reference numeral 11 denotes a high water level detection sensor attached to the steam generator 2, and after detecting the high water level in the steam generator 2, the operation of the gas burner 1 is started. Reference numeral 12 denotes a safety valve with a contact that opens when the pressure inside the steam generator 2 exceeds a certain value and lowers the pressure inside the steam generator 2.

Next, the operation of the above embodiment will be explained. Before the start of operation, the hot water circulation circuit a and the steam generator 2 are filled with water as a working fluid.
When the gas burner 1 starts combustion, the steam generator 2
The water inside is heated and saturated steam is generated at a pressure determined by the heat output of the gas burner 1 and the diameter of the nozzle 3. This saturated steam is ejected from the nozzle 3 into the ejector 4, and the hot water in the ejector 4 is passed through the outgoing pipe 5.
Push it to the side. At this time, the saturated steam is ejector 4
It is mixed with hot water in the mixing section 4', and the hot water is heated by giving sensible heat based on the latent heat and the temperature difference between the hot water and the hot water after mixing. The hot water heated in this way in the hot water circulation circuit a gives the heat necessary for heating to the living room in the radiator 6, and returns to the neck 4'' of the ejector 4 through the return pipe 7 by the ejector effect. By this action, the hot water in the hot water circulation circuit a is heated and forcibly circulated.

Evaporation of the working fluid in the steam generator 2 progresses, and when the low fluid level detection sensor is activated, the control circuit stops the gas burner 1. As a result, the inside of the steam generator 2 is cooled, the steam is cooled and condensed, and the inside of the steam generator 2 becomes a vacuum state. As a result, the water in the expansion tank 8 is supplied into the steam generator 2 due to the pressure difference from the atmospheric pressure, and when the high liquid level detection sensor is activated, the gas burner 1 is ignited and steam is generated. 2
The internal pressure rises, the water supply is cut off, and the heating operation starts again.

FIG. 2 shows an embodiment in which headers 13 and 14 are provided in the mixing part 4' and neck part 4'' of the ejector 4, respectively, and the hot water flow path is branched into a plurality of radiators 6. An on-off valve 15 is attached to the radiator 6 and is closed when not in use to prevent loss of thermal energy of the hot water.

FIG. 3 shows an embodiment in which the ejector 4 and the radiator 6 are in one-to-one correspondence, and the solenoid valve 16 provided in the nozzle 3 is opened when the radiator 6 is in operation.

[Effects of the present invention] As described above, the present invention provides a hot water circulation type heating device that uses the ejection energy of saturated steam to generate forced circulation of hot water in the hot water circulation circuit without using a circulation pump. This has the effect of eliminating all the equipment costs, increased running costs, and maintenance problems associated with conventional electric circulation pumps.

Furthermore, since water is automatically supplied to the steam generator using high and low liquid level detection sensors and a control circuit, the system has the effect of operating reliably, albeit intermittently.

[Brief explanation of drawings]

Fig. 1 is an embodiment of the present invention, Fig. 2 is an embodiment in which hot water is circulated to a plurality of radiators by a common ejector, and Fig. 3 is a diagram in which a hot water circulation circuit is provided for each heater. Fig. 2 is an embodiment diagram in which an ejector is attached to the inlet of the ejector, and an electric valve that can be turned on and off in conjunction with the operation switch of the radiator is attached to the inlet of the ejector. DESCRIPTION OF SYMBOLS 1... Heat source, 2... Steam generator, 3... Nozzle, 4... Ejector, 5... Outgoing pipe, 6... Heat radiator, 7... Return pipe, 8... Expansion tank, 9...
Temperature sensor, 10...Low water level detection sensor, 11
...High water level detection sensor, 12...Safety valve, 13,
14... Header, 15... Valve.

Claims (1)

[Claims] 1. A sealed steam generator filled with a working fluid; a low level detection sensor for detecting a low level of the working fluid in the steam generator; and the steam generator. a high liquid level detection sensor for detecting a high liquid level of the working fluid in the steam generator; a burner for heating the working fluid in the steam generator to generate saturated steam in the steam generator; and a burner for supplying fuel to the burner. A fuel valve attached to a supply pipe to be used, an inlet side of a radiator connected to a mixing discharge port, an outlet side of the radiator connected to a neck via a return pipe, and steam generated in the steam generator an ejector having a jet nozzle facing the neck, an expansion tank that is open to the atmosphere and connected to a return pipe between the outlet side of the radiator and the ejector, and a low liquid level detection sensor that detects a low liquid level. A hot water circulation type heating device comprising: a control circuit that closes the fuel valve when a high liquid level is detected and opens the fuel valve when a high liquid level detection sensor detects a high liquid level;