JPH074677A - Hot water supply apparatus - Google Patents

Abstract

PURPOSE:To eliminate the fear of a heat exchanger being damaged even if to the temperature of hot water in a heating can becomes abnormally high and prevent any failure from being produced owing to no-load operation of a circulation pump by providing a bypass passage having a flow rate control valve which couples the upstream and downstream sides of the heat exchangher. CONSTITUTION:Between flow passages 5, 6 there is provided a bypass passage 8 having a flow rate regulating controlling valve 9 connected with the upstream and downstream sides of heat exchangers 11-1 to 11-3. A circulation pump 7 is actuated at all times to circlate hot water between the flow passages 5, 6 and force the hot water to flow into the bypass passage 8. Hereby, there is prevented the amount of hot water flowing into a hot water producer portion 1 from being increased and the temperature of the hot water in the heating can 18 from becoming abnormally high owing to the short of the flow rate. Accordingly, the fear of damaging the heat exchangers 11-1 to 11-3 is eliminated and heance the heat exchangers 11-1 to 11-3 are prevented from being interrupted when they are not needed to be interrupted. Additionally, any failure is prevented from being produced owing to no-load operation of the circulation pump 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device for a building having a large number of living rooms such as a single-family house, a condominium, a hotel, a general building and a factory.

[0002]

2. Description of the Related Art There is a hot water supply apparatus as shown in FIGS. 7 and 8 as described above.
And a load part 2, and a hot water generating part 1 and a load part 2 are respectively provided with a generating flow path 3 and a load flow path 4, and the outlet of the generating flow path 3 and the inlet of the load flow path 4 are formed. Is connected to the forward flow path 5 and the outlet of the load flow path 4 and the inlet of the generation flow path 3 are connected by a return flow path 6 provided with a circulation pump 7 to form a closed flow path. A water supply channel 27 having a valve 26 is connected to the flow channel 6. A plurality (three in this embodiment) of heat exchangers 11'-1, 2, 3 having a heater 10 in the hot water generator 1.
And the heater 10 provided in the generation flow path 3 downstream thereof.
Thermal sensors 12-1, 2, 3 for controlling the operation of the above are provided. The load flow path 4 of the load unit 2 is provided with a heat retention adjusting valve 13, and the upstream and downstream parts thereof and a plurality of (two in this embodiment) load members 15 are connected by a branch flow path 14 to form a branch flow path. A calorimeter 16 is provided at the return line of 14. The hot water generator 1 is shown in FIG.
The heat exchangers 11'-1, 2, 3 of the hot water generating section 1 have a heating can 18, and the heating can 18 is shown in detail.
Is provided with a high limit sensor 17 and a water supply unit 21, and a heating chamber 19 'is installed inside.
9'is a hollow cylinder, and the flame inlet 23 of the heater 10 composed of a burner is opened at the lower part of one side thereof, and the exhaust port 24 is provided at the upper part of the other side. The exhaust pipe 20 is connected, and the heat exchange section 22 of the outward flow path 12 is arranged above the inside of the heating can 18. Each of the load members 15 is provided with a water heater 31, a heater 32, and other load devices not shown, and the return passage 6 is connected to a water purifier 28 including a water purifier 28 and a water purification pump 29.

In the conventional hot water supply apparatus as described above, the temperature control valve 13 is fully opened to open the valve 26 and water is supplied to the closed flow path through the water supply passage 9 to fill the closed flow path, and then the valve 26 is closed. , The circulation pump 7 and the water purification pump 29 are operated to circulate the water in the closed flow path through the closed flow path, and at the same time, the heaters 10 of the heat exchangers 11'-1, 2, 3 are connected.
To start heating the water. When the water heated in this way reaches a predetermined temperature, the heat retention adjustment valve 13 is fully closed once, and the temperature / pressure gauges 39, 40 provided before and after that are installed.
Thus, the heat retention adjusting valve 13 is opened to an opening such that the pressure difference between the front and rear and the temperature have a preset minimum flow rate. It is necessary to circulate hot water even when there is no load of hot water consumption in the load member 15 of the load section 2, but a fully closed flow path including the flow path between the hot water generating section 1 and the load section 2. Since the length of is large, increasing the circulation flow rate increases the heat radiation loss outside the pipe in proportion to the circulation flow rate.Therefore, the heat loss due to the heat radiation of the hot water flowing through it increases. In order to prevent this by making the flow rate of hot water as small as possible and to quickly supply hot water to the load member 15 at the time of load, a large amount is provided between the upstream side and the downstream side of the heat retention adjusting valve 13. This is for generating a differential pressure. At this time, a predetermined temperature is set in the heat sensors 12-1, 2 and 3, and when the liquid in the generation flow path 3 becomes lower than this set temperature, a signal from the heat sensors 12-1, 2 and 3 causes Heater
10 operates to heat the liquid supplied in the water supply part 21 into the heat exchangers 11'-1, 2, 3 and the heated liquid and the liquid flowing in the heat exchange part 22 of the generation flow path 3 are separated from each other. When heat is exchanged between the liquids to become hot water, and when the liquid in the generation flow path 3 becomes higher than the set temperature, on the contrary, the signal from the high limit sensor 17 causes the heater 10 to stop operating and heat exchange. Vessel 11'-
The heating of the liquid supplied by the water supply unit 21 to the insides of 1, 2 and 3 is stopped. During these periods, the circulation pump 7 is constantly operating to constantly circulate the hot water in the closed flow path.

[0004]

In such a conventional hot water supply apparatus, the temperature of the hot water is maintained at a predetermined temperature and the load member 15 is adjusted by adjusting the flow rate of the heat retention adjusting valve 13 as described above. However, since the plurality of heat exchangers 11'-1, 2, 3 are sequentially arranged farther from the circulation pump 7, the pipe resistance is gradually increased and the heat flow is increased. The flow rate of the hot water gradually decreases, and (1) the flow of the hot water in the generation flow path 3 in which the heat sensor 12-3 attached to the heat exchanger 11'-3 having the lowest flow rate is provided is stopped. The thermal sensor 12-3 outputs a signal regardless of the fact that the temperature of the hot water inside the heating can 18 is not particularly low and the operation of the heater 10 is not necessary because the temperature becomes close to the state due to natural heat radiation loss outside the tube. And (2) the flow rate in the heat exchange section 22 decreases. As a result of the liquid that is supplied in the water supply part 21 into the heating can 18 and generates convection, the hot water moves to the vicinity of the inlet of the heat exchange part 22 as shown by the dotted line in FIG. Flows backward and the thermal sensor 12-3 outputs a signal. Then, a signal from such a heat sensor 12-3 is input to the heater 10 to operate the heater 10, whereby the temperature of the hot water in the heating can 18 becomes abnormally high and the heat exchanger 11 '
-3 is not only dangerous because it may be damaged, but also the idle operation of the circulation pump 7 is likely to occur, so that the high limit sensor 17 judges that the temperature is abnormally high, and it is supposed to stop. There is a problem that the heat exchanger 11'-3, which is not necessary, must be stopped.

An object of the present invention is to solve the above-mentioned problem of the conventional hot water supply apparatus, and the invention of claim 1 is such that the flow rate of the fluid flowing through the generation flow path is not limited to the minimum flow rate. Since the temperature of the hot water in the heating can becomes abnormally high and there is no risk of damaging the heat exchanger, there is no danger of stopping the heat exchanger when there is no need to stop it. A hot water supply device which does not cause a failure by causing an idle operation of the circulation pump, and the invention of claims 2 and 3 is such that the combustion gas generated in the combustion chamber due to the operation of the heat exchanger rises in the heating chamber. While descending rearward and being discharged to the outside from the exhaust port, heat is exchanged with the liquid in the heating can on the outer surface, and the heat exchange causes the combustion gas in the heating chamber to heat the liquid. By supplying, the downward fluidity is enhanced and combustion efficiency is improved. As a result, incomplete combustion is prevented, and the liquid in the heating can raises and descends convection, increasing the heat exchange rate between the combustion gas and the liquid to quickly raise the temperature of the liquid, and the operation of the heat exchanger. Even when the combustion is stopped, the combustion gas stays inside the heat exchanger to prevent cold air from entering from the outside and to keep the heat of the water in the water tank by radiating heat. A liquid heating device is provided.

[0006]

In order to achieve the above object, the present invention provides a hot water generating portion having a generation flow passage and a load portion having a load flow passage. A heat exchanger having a connecting flow passage for connecting the generation flow passage and the load flow passage, a closed flow passage having a circulation pump is formed by these, and a hot water generator having a heater. And a heat sensor provided in the generation flow passage for controlling the operation of the heater, and a heat retention adjustment valve provided in the load flow passage, and a branch connecting the upstream and downstream sides of the heat retention adjustment valve in the load flow passage. In a hot water supply device in which a flow path is provided and a load member is installed in this branch flow path, a bypass pipe having a flow rate control valve that connects the upstream and downstream sides of the heat exchanger between the connection flow paths is provided. It is what According to a second aspect of the present invention, in the first aspect of the present invention, the heating chamber installed inside the heat exchanger has a flame inlet of the heater at one lower side and an exhaust port at the other lower side. It is provided, and the middle of them is an inverted U-shape. According to the invention of claim 3, in the invention of claim 2, the flame inlet of the heater of the heating chamber is installed above the exhaust port, and the flame inlet is sealed by the heater. .

[0007]

In the above invention, the invention of claim 1 fully opens the heat retention adjusting valve to fill the fully closed flow path including the bypass flow path with water, and then operates the circulation pump to close the closed flow path. Water is circulated in the closed flow path, and at the same time the heat exchanger is activated to heat the water, and when the water heated in this way reaches a predetermined temperature, the heat retention adjustment valve When the temperature control valve is opened to an opening that allows the pressure difference and temperature to have a preset minimum flow rate, and when the liquid in the generation flow channel becomes lower than the set temperature in this way, the heat exchanger operates and water On the contrary, when the liquid in the generation channel becomes higher than the set temperature, the operation of the heat exchanger is stopped and the heating of water is stopped. During these periods, the circulation pump is constantly operated to constantly circulate the hot water between the reciprocating flow passage and the bypass flow passage as well, whereby the hot water flowing into the heat exchanger of the hot water generating section is circulated. Increase the amount. In this case, in the invention of claims 2 and 3, when the heater of the heat exchanger is activated, the combustion gas generated in the heating chamber rises in the heating chamber, then reverses and descends, and passes through the exhaust port to the outside from the exhaust pipe. It will be discharged. In this way, while the combustion gas rises and falls in the heating chamber, heat is exchanged with the liquid in the heating can on the outer surface thereof, and this heat exchange causes the combustion gas, especially in the descending portion, to move inside and outside. By supplying heat to the liquid in the heating can, its descending fluidity is enhanced, and during this time, the liquid in the heating can generates convection ascending and descending in the heating can, increasing the heat exchange rate between the combustion gas and the liquid. Further, even when the operation of the heat exchanger is stopped, the combustion gas stays inside the heat exchanger and prevents cold air from entering from the outside.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Most of the embodiments of the present invention shown in FIGS. 1 and 2 are constructed in the same manner as the above-mentioned conventional ones, and therefore, the explanation is omitted by giving the same reference numerals to such parts. However, mainly different parts will be described.
Bypass flow path 8 having a flow control valve 9 that connects the upstream and downstream sides of the heat exchangers 11-1, 2 and 3 between the reciprocating flow paths 5 and 6.
Is provided. And heating cans of heat exchangers 11-1, 2, 3
Inside the 18, a flame supply port 23 of the heater 10 is opened at the lower part on one side and an exhaust port 24 is provided at the lower part on the opposite side, and a heating chamber 19 having an inverted U-shape in the middle thereof is provided. is set up.

In the above-mentioned structure, in the same manner as the conventional one, the temperature control valve 13 is fully opened to fill the fully closed flow path including the bypass flow path 8 with water, and then the circulation pump 7 is operated. Water in the closed flow path is circulated in the closed flow path and at the same time heat exchanger
11-1, 1, 2 and 3 are activated to heat the water, and when the water heated in this way reaches a predetermined temperature, the heat retention adjusting valve 13
The heat retention adjusting valve 13 is opened to an opening such that the pressure difference and the temperature of the hot water before and after that are the minimum flow rates set in advance. When the liquid in the generation flow channel 3 becomes lower than the set temperature in this way, the heat exchangers 11-1, 2 and 3 operate to heat the water, and conversely, the liquid in the generation flow channel 3 becomes lower than the set temperature. When the temperature becomes higher, the operation of the heat exchangers 11-1, 2 and 3 is stopped and the heating of water is stopped. During these periods, the circulation pump 7 is constantly operated to constantly circulate the hot water between the reciprocating flow passages 5 and 6, and also to circulate in the bypass flow passage 8 so that the heat flowing into the hot water generating portion 1 is generated. When the amount of water increases and the flow rate is insufficient to prevent abnormal heat generation in the hot water inside the heating can, there is no risk of damaging the heat exchanger, there is no danger, and there is no need to stop. Without stopping the heat exchanger in
Further, it is possible to prevent the idle operation of the circulation pump from occurring and to prevent a failure.

In the above case, the heat exchangers 11-1 and 11-2 shown in FIG.
When the heater 10 of No. 3 operates, the combustion gas generated in the heating chamber 19 rises in the ascending section 41, enters the upper circulation section 43, then reverses and descends the descending section 42, and passes through the exhaust port 24. It will be discharged from the exhaust pipe 20 to the outside. There is such a heat exchanger 11 as disclosed in Japanese Utility Model Publication No. 55-42216, which is proposed by the applicant, and a phenomenon called up-and-down flow of combustion gas occurs. It will be described with reference. In the combustion gas passage having the rising portion 41 of the heating chamber 19 and the descending portion 42 of the same height H, the combustion gas generated by the operation of the heater 10 has a heating point U and an intermediate point M. It is known that when the exhaust point is D, the internal ventilation force Pch shown in the following equations (1) and (2) is generated regardless of the state of the outside air. Pch = (γd−γu) ・ H …………………… (1) Pch = PH / R (1 / Td-1 / Tu) ………… (2) where γd: descending part 42 Combustion gas specific weight at γu: Combustion gas specific weight at rising section 41 H: Height from mid-point M to exothermic point U P: Combustion gas pressure R: Combustion gas constant Td: Combustion gas temperature Tu at descending section 42: Increase When the heat exchanger 11 is in operation, that is, when the heater 10 is in operation, Tu> Td is always satisfied, so that (1 / Td)
−1 / Tu)> 0, and the combustion gas flows in the direction of exothermic point U → intermediate point M → exhaust point D. On the other hand, the heat exchanger 11
During the operation stop of, it means that Tu = Td = the temperature of the stored water in the surroundings. Therefore, the internal aeration force Pch = 0 and the flow of the combustion gas in the combustion gas passage is stopped and stays there.
It prevents cold air from entering from the outside and keeps heat.

4 and 5 show two other examples of the heat exchanger 11 (hereinafter referred to as Examples 2 and 3). In this example, as shown in FIG. Since the exhaust point D is below the exothermic point U by h, the exhaust point D is located below the exothermic point U by a distance h as shown in FIG. 9 in the above formulas (1) and (2). Because I am doing
If the pressure at each point U, M, D is Pu, Pm, Pd, then Pd = Pm + ∫γd ・ dH ……………………………… (3) Pu = Pm + ∫γu ・ dH = Pm + γu ・H + γd · h (4), where Pd is released to the atmosphere, so Pd = Po
(Atmospheric pressure). Therefore, Po = Pm + γd · H + γd · h (5) Pm = Po−γd · H−γd · h (6) Then, by substituting this into Eq. (4), Pu = Po−∫γd · H−γd · h + ∫u · dH = Po−γd · H−γu · h + γu · H (7). Since γd = γu while the heat exchanger 21 is not operating, Pu = Po + γd · h, that is, Pu−Po = γd · h
<0 and the relation Pu <Po is always maintained, and the combustion gas in the combustion gas passage does not stay in the combustion gas passage and flows in the direction of exhaust point U → intermediate point M → heating point U. However, there is a problem that the heat of the hot water in the heating can 18 is radiated to the outside without preventing the invasion of the outside air. That is, when the heater 10 stops operating, the combustion gas inside is theoretically exhausted from the exhaust point D → the middle point M → the same as in the conventional one.
Like the heating point U, it flows in the direction opposite to that of the operation of the heat exchanger 2 and tries to flow out of the device. However, in these two examples, since the heater 10 is installed at the flame inlet 23 and sealed to prevent the flow thereof, the combustion gas stays inside the heating chamber 19 and prevents cold air from entering from the outside. As a result, the heat of the hot water in the heating can 18 is not radiated to the outside by the heat retaining function. In Example 3, the descending portion 42 is located outside the heating can 18, and the descending portion 42 is covered with a heat insulating material 44.

[0012]

The present invention is as described above, and the invention of claim 1 connects the generation flow path of the hot water generation section and the load flow path of the load section by a connection flow path, A closed flow path having a circulation pump is formed, a heat exchanger having a heater is provided in the hot water generating part, and a heat sensor provided in the generation flow path to control the operation of the heater is provided. A heat-retention adjusting valve is provided, and a branch flow passage that connects the upstream and downstream sides of the heat-retention adjusting valve in the load flow passage is provided, and a load member is installed in this branch flow passage, and the heat exchanger upstream and downstream between the connection flow passages. Since the bypass pipe having the flow control valve connecting the two sides is provided, the flow rate of the fluid flowing through the generation flow path is not limited to the minimum flow rate, and the temperature of the hot water in the heating can becomes abnormally high. , There is no danger of damaging the heat exchanger and no need to stop There is an effect that has never stopping the heat exchanger without also generates a fault occurs an empty operation of the circulation pump Itoki. According to the inventions of claims 2 and 3, in the invention of claim 1, the heating chamber installed inside the heat exchanger has a flame inlet of the heater opened at a lower part on one side and exhausted at a lower part on the opposite side. Since the mouth is provided and it has an inverted U-shape in the middle of these, in addition to having the same effect as the invention of claim 1, the combustion gas generated in the combustion chamber by heating the heat exchanger is heated. While rising in the room and then descending and being discharged to the outside from the exhaust port, heat is exchanged with the liquid in the heating can on the outer surface, and this heat exchange causes the combustion gas in the heating chamber to By supplying heat to the liquid inside and outside, the descending fluidity is enhanced, the combustion efficiency is improved and incomplete combustion is prevented, and the liquid in the heating chamber generates convection ascending and descending to generate combustion gas. The heat exchange rate with the liquid is increased to quickly raise the temperature of the liquid and the heat exchanger is activated. If the seals, as well as the combustion gas tries to flow out to the outside,
The combustor installed in the flame inlet suppresses the flow of the combustor, the combustion gas stays inside the heat exchanger, prevents cold air from entering from the outside, and has an effect of retaining heat.

[Brief description of drawings]

FIG. 1 is a piping diagram of an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a part of the hot water generating unit of the above.

FIG. 3 is an explanatory diagram for explaining a heat exchange state by combustion gas in the heating chamber of the above.

FIG. 4 is a vertical cross-sectional view of another example of the hot water generating unit of the above.

FIG. 5 is a vertical sectional view of still another example of the above.

FIG. 6 is an explanatory diagram for explaining a heat exchange state by combustion gas in the heating chamber of the above.

FIG. 7 is a piping diagram of a conventional hot water supply apparatus of the same type as the present invention.

FIG. 8 is a vertical cross-sectional view of a part of the hot water generating unit of the above.

[Explanation of symbols]

 1 Hot Water Generation Section 2 Load Section 3 Generation Flow Path 4 Load Flow Path 5 Outgoing Flow Path 6 Return Flow Path 7 Circulation Pump 8 Bypass Flow Path 9 Flow Control Valve 10 Heater 11 Heat Exchanger 12 Heat Sensor 13 Thermal Control Valve 14 Branch flow path 15 Load member 17 High limit sensor 18 Heating can 19 Heating chamber 21 Water supply section 22 Heat exchange section 23 Flame inlet 24 Exhaust outlet

[Procedure amendment]

[Submission date] December 22, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art There is a hot water supply device as shown in FIGS.
And a load section 2, and the hot water generating section 1 and the load section 2 are provided with a generation flow path 3 and a load flow path 4, respectively,
The outlet of the generation flow path 3 and the inlet of the load flow path 4 are the outflow path 5,
Further, the outlet of the load passage 4 and the inlet of the generation passage 3 are connected by a return passage 6 provided with a circulation pump 7 to form a closed passage, and a valve 26 is provided in the return passage 6. Water supply channel 27
Are connected. The hot water generator 1 has a plurality of (three in this embodiment) heat exchangers 11'-1, 2 ', each having a heater 10.
3 and a heater provided in the generation flow path 3 downstream thereof.
Thermal sensors 12-1, 2, 3 for controlling the operation of 10 are provided. The load flow path 4 of the load unit 2 is provided with a heat retention adjusting valve 13, and the upstream and downstream parts thereof and a plurality of (two in this embodiment) load members 15 are connected by a branch flow path 14 to form a branch flow path. A calorimeter 16 is provided at the return line of 14. FIG. 4 shows the details of a part of the hot water generating unit 1. The heat exchangers 11'-1, 2, 3 of the hot water generating unit 1 have a heating can 18, and this heating can
A high limit sensor 17 and a water supply unit 21 are provided at 18, and a heating chamber 19 'is installed inside.
The reference numeral 19 'is a hollow cylinder, and the flame inlet 23 of the heater 10 composed of a burner is opened at the lower part of one side thereof, and the exhaust port 24 is provided at the upper part of the other side. The pipe 20 is connected, and the heat exchange part 22 of the outward flow path 12 is arranged above the inside of the heating can 18. Each load member 15 has a water heater 31 and a warm
Boki及 beauty not shown other loads instrument is provided, water purification path 30 equipped to the return passage 6 and water purifier 28, purified water pump 29
Are connected.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

In the conventional hot water supply apparatus as described above, the temperature control valve 13 is fully opened to open the valve 26 and water is supplied to the closed flow path through the water supply passage 9 to fill the closed flow path, and then the valve 26 is closed. , The circulation pump 7 and the water purification pump 29 are operated to circulate the water in the closed flow path through the closed flow path, and at the same time, the heaters 10 of the heat exchangers 11'-1, 2, 3 are connected.
To start heating the water. When the water heated in this way reaches a predetermined temperature, the heat retention adjustment valve 13 is fully closed once, and the temperature / pressure gauges 39, 40 provided before and after that are installed.
Thus, the heat retention adjusting valve 13 is opened to an opening such that the pressure difference between the front and rear and the temperature have a preset minimum flow rate. It is necessary to circulate hot water even when there is no load of hot water consumption in the load member 15 of the load section 2, but a fully closed flow path including the flow path between the hot water generating section 1 and the load section 2. Since the length of is large, increasing the circulation flow rate increases the heat radiation loss outside the pipe in proportion to the circulation flow rate.Therefore, the heat loss due to the heat radiation of the hot water flowing through it increases. In order to prevent this by making the flow rate of hot water as small as possible and to quickly supply hot water to the load member 15 at the time of load, a large amount is provided between the upstream side and the downstream side of the heat retention adjusting valve 13. This is for generating a differential pressure. And salary
Hot water is consumed by the hot water tap 35 opening in the water heater 31
And tap water is supplied from the supply pipe 32 through the pressure switch 33.
At the same time, the signal from the pressure switch 33
This motor valve 34 is sent to the water heater 34, and hot water is supplied to the water heater 31.
Instantly between this hot water and the replenished tap water
Heat is supplied to the hot water from the hot water tap 35. on the other hand
When using the heater, open the valve 36 and let hot water flow into it.
Then, at rest, close valve 36 to prevent hot water from flowing in.
Has become. The hot water used in this way is a calorimeter.
By passing through 16, the amount of heat consumed by the load section 2 is grasped. At this time, the heat sensor 12-1,
Predetermined temperatures are set in 2 and 3, and when the liquid in the generation flow path 3 becomes lower than the set temperature, the thermal sensor 12-
The heater 10 operates in response to the signals from 1, 2, 3 to heat the liquid supplied in the water supply section 21 into the heat exchangers 11'-1, 2, 3 and the heated liquid and the generation flow path. 3 heat exchange section 22
When heat exchange is performed with the liquid flowing through the liquid and the liquid becomes hot water, and conversely the liquid in the generation flow channel 3 becomes higher than the set temperature, the heater 10 is activated by a signal from the high limit sensor 17. After that, the heating of the liquid supplied by the water supply unit 21 into the heat exchangers 11'-1, 2, 3 is stopped. During these periods, the circulation pump 7 is constantly operating to constantly circulate the hot water in the closed flow path.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F24H 1/50 1/52 7526-3L F24H 1/44 H

Claims (3)

[Claims] 1. A hot water generating part having a generation flow path, and a load part having a load flow path, wherein a connection flow path for connecting the generation flow path and the load flow path is provided. A closed flow path having a circulation pump is formed by the heat exchanger, a heat exchanger having a heater and a heat sensor for controlling the operation of the heater are provided in the hot water generator, and a load flow path is provided. Is provided with a heat retention adjusting valve, a branch flow passage is provided in the load flow passage for connecting the upstream and downstream sides of the heat retention adjustment valve, and a load member is installed in the branch flow passage. A hot water supply device having a bypass flow path having a flow rate control valve connecting the upstream and downstream sides of a heat exchanger between them. 2. The heating chamber installed inside the heat exchanger comprises:
The hot water supply apparatus according to claim 1, wherein a flame supply port of the heater is opened at a lower portion on one side, and an exhaust port is provided at a lower portion on the opposite side, and an intermediate portion between them has an inverted U shape. 3. The hot water supply apparatus according to claim 2, wherein the flame feed port of the heater of the heating chamber is installed above the exhaust port, and the flame feed port is sealed by the heater.