JP3124392B2 - Hot water heating circulation device for hot water storage tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention circulates hot water stored in a hot water storage tank such as a bathtub while efficiently increasing the amount of carbonate ions dissolved in the hot water and, if necessary, heating. The present invention relates to a hot water heating and circulating device for a hot water storage tank that can perform hot water heating.

[0002]

2. Description of the Related Art If water supplied to a hot water storage tank is heated by a direct contact type hot water heater, dissolved oxygen in the heated hot water is degassed and carbonate ions are taken into the hot water. It is widely known that warm water, which is good and incorporates carbonate ions, has a fatigue recovery effect. Conventionally, a direct contact hot water heater having such an effect has been used exclusively for heating cold water newly supplied to a hot water storage tank. For example, when the hot water storage tank is a bath tub, the temperature of the hot water in the bath tub must be maintained at a desired temperature, but since the hot water in the bath tub is open to the atmosphere, it takes a long time. The temperature decreases over time. Therefore, conventionally, in order to maintain the temperature of the hot water in the bathtub at a desired temperature, a circulation pipe provided with a heating means for merely taking out the hot water in the bathtub from the bathtub and heating the same is installed. Heating in the process of circulating the reduced hot water through the circulation pipeline, or supplying new hot water at a temperature higher than the desired temperature to maintain the hot water stored in the bath tub at the desired temperature It is.

[0003] However, the hot water heated by the direct contact hot water heater and taking in a large amount of carbonate ions is supplied to the hot water storage tank, and as the temperature decreases over time, as shown in FIG. In the case where the former is provided with a circulation pipe provided with the above-mentioned heating means to heat the hot water, the heat exchanger simply heats the hot water through the pipe. Therefore, the dissolved amount of carbonate ions in the warm water in the warm water storage tank is disadvantageously reduced. In the latter case, if the hot water heated to a temperature higher than the desired temperature by the direct contact hot water heater is supplied into the hot water storage tank, the high temperature hot water in which a large amount of carbonate ions are dissolved can be obtained. Although it can be supplied into the hot water storage tank, for example, cold water such as tap water at room temperature is heated and then newly supplied, so that the amount of heat required in the direct contact type hot water heater increases and the heat efficiency is poor. In addition, the hot water in the hot water storage tank has to be drained in an amount corresponding to the amount of cold water to be newly supplied, which is not only uneconomical but also disadvantageous in terms of resources.

Therefore, a direct contact hot water heater is used as the heating means in the former, and a part of the hot water in the hot water storage tank is heated by the direct contact hot water heater and returned to the hot water storage tank to be heated. The present applicants have proposed a method for maintaining the temperature of the hot water tank for maintaining the temperature of the hot water in the storage tank at a desired temperature (see Japanese Patent Application Laid-Open No. 2-122147). In this method, only when the temperature of the hot water in the hot water storage tank drops below a desired temperature, a portion of the hot water in the hot water storage tank is brought into direct contact with the combustion gas by a direct contact hot water heater to heat the hot water storage tank. This is a method of returning to the inside of the tank. Therefore, when the temperature of the hot water in the hot water storage tank falls below a desired temperature, the dissolved amount of carbonate ions in the hot water can be increased and the hot water in the hot water storage tank having a relatively high temperature is heated. Therefore, the amount of heat used in the direct contact hot water heater can be suppressed low, and the amount of carbonate ions can be increased economically and efficiently. Therefore, it is not necessary to separately provide a device for dissolving carbonate ions in hot water. There are advantages.

[0005] However, the above-mentioned method proposed by the present applicants is intended to maintain the temperature of the hot water in the hot water storage tank as is clear from the title of the invention, "Method of maintaining the temperature of the hot water tank". This is a method of supplying a part of the hot water to the direct contact hot water heater, heating it, and then returning it to the hot water storage tank, so as to maintain the dissolved amount of carbonate ions in the hot water in the hot water storage tank If the temperature of the hot water in the hot water storage tank is higher than the desired temperature or higher than the desired temperature, the hot water having a low dissolved amount of carbonate ion is filtered and then supplied to the direct contact hot water heater afterward. Simply return a portion of the hot water in the hot water storage tank to return to the hot water storage tank, and while the temperature of the hot water in the hot water storage tank is at the desired temperature or higher than the desired temperature, Dissolved amount simply decreases There is a drawback that it becomes.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art and efficiently increases the dissolved amount of carbonate ions in hot water in a hot water storage tank such as a bathtub regardless of the temperature of the hot water. It is an object of the present invention to provide a hot water heating and circulating device for a hot water storage tank which can be heated and circulated as needed to maintain a desired temperature.

[0007]

Means for Solving the Problems The present inventors have conducted various studies to solve the above problems, and as a result, circulated a part of the warm water in the warm water storage tank in which the dissolved amount of carbonate ion was reduced, and again stored the warm water. Focusing on the fact that carbonated ions can be efficiently increased if all hot water circulated when supplied into the tank is brought into direct contact with the combustion gas and then supplied into the hot water storage tank, the hot water in the hot water storage tank is A discharge pipe which is taken out for circulation is connected to a direct contact hot water heater for heating the supplied hot water and / or cold water by directly contacting it with the combustion gas and an exhaust port of the direct contact hot water heater. A heat absorbing chamber filled with a heat absorbing material is provided above the combustion gas chamber to which the combustion gas is supplied from the mouth. The pipes are respectively connected to a direct contact type carbonate ion absorber for directly bringing the supplied combustion gas into contact with the supplied combustion gas to absorb carbonate ions in the hot water, and the hot water of the direct contact type hot water heater and the direct contact type carbonate ion absorber is heated with hot water. If the supply pipe to be supplied into the storage tank is connected to the hot water storage tank,
The present invention has been completed by investigating that it is possible to surely increase the dissolved amount of carbonate ions in all of the hot water circulated and supplied again into the hot water storage tank, and it is possible to heat the hot water efficiently if necessary.

Hereinafter, a hot water heating and circulating apparatus for a hot water storage tank according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a system diagram showing one embodiment of a hot water heating and circulating device for a hot water storage tank according to the present invention.

In the drawings, 1 is a hot water storage tank such as a bathtub for storing hot water, and 2 is a combustion gas chamber 2b provided above a lowermost hot water storage section 2a and a heat absorbing material further above the combustion gas chamber 2b. A filled heat absorbing chamber 2c is provided and a combustion gas chamber
This is a direct contact hot water heater having a known structure in which an exhaust port 2d for exhausting combustion gas from the heat absorbing chamber 2c through the heat absorbing chamber 2c is provided at an upper portion. Since the direct-contact hot water heater 2 supplies hot water stored in the hot water storage section 2a to, for example, a heating or other use place, the fuel is normally burned in the combustion gas chamber 2b at all times. Reference numeral 3 denotes a direct contact hot water heater 2 in which a combustion gas chamber 3a, which is in direct contact with hot and / or cold water and is supplied with a relatively low temperature combustion gas via a heat absorbing chamber 2c, is exhausted by the direct contact hot water heater 2. A direct contact type carbonate ion absorber, which is provided at the lowermost portion in a state communicating with the port 2d, and is provided with a heat absorbing chamber 3b filled with a heat absorbing material above the combustion gas chamber 3a, An exhaust port 3c for discharging the combustion gas passing through the heat absorbing chamber 3b is provided above the direct contact type carbonate ion absorber 3.

Reference numeral 4 denotes an outlet pipe for supplying hot water taken out for circulation from the hot water storage tank 1 to the direct contact type hot water heater 2 and the direct contact type carbonate ion absorber 3. It comprises a first extraction pipe 4a connected to the direct contact hot water heater 2, and a second extraction pipe 4b connected to the hot water storage tank 1 and the direct contact carbonate ion absorber 3. At least a pump 6 is installed in the take-out pipe 4. If necessary, for example, when the hot water storage tank 1 is a bathtub, a dust remover 12 for removing relatively coarse turbid matter such as hair as shown in FIG. A filter dispenser 11 (hereinafter sometimes collectively referred to as an ancillary device) for filtering fine turbid substances such as dirt and injecting a sterilizing agent is provided, and at least the dust remover 12 is provided with a pump 6. Is provided on the upstream side. Such an outlet pipe 4 is connected to a first outlet pipe 4a connected to a direct contact hot water heater 2 and a direct contact carbonate ion absorber 3 on the downstream side of the pump 6 and other auxiliary devices as shown in FIG. It is preferable to be branched to the second extraction pipe 4b because the pump 6 and other auxiliary devices can be shared for each of the extraction pipes 4a and 4b.

The opening and closing of the first outlet pipe 4a connected to the direct contact hot water heater 2 is controlled by the temperature of the hot water in the hot water storage tank 1, and the flow rate of the hot water supplied to the direct contact hot water heater 2 is controlled. Preferably, a regulating valve 8 is provided. In the embodiment shown in FIG.
For example, the temperature detector 14 detects the temperature of the hot water flowing through the outlet pipe 4 and controls the valve 8 to open when the detected temperature is lower than a predetermined temperature. Alternatively, when the temperature is higher than this temperature, the valve 8 is controlled to be closed. At this time, even if the valve 8 is closed, it is set so that the hot water flows somewhat, so that the hot water can always be supplied to the direct contact type hot water heater 2 and the hot water can be supplied to the side wall of the heat absorbing chamber 2c and the combustion chamber 2b. Since a water film can be formed, the heat absorbing chamber 2b and the combustion chamber
This is preferable because the side wall 2b can be cooled.

Reference numeral 5 designates a direct contact type carbonate ion absorber 3 which is taken out of the hot water storage tank 1 and is fed under pressure through the take-out pipe 4.
And a supply pipe for supplying the hot water supplied to the direct contact type hot water heater 2 to the hot water storage tank 1 again as required.
A main supply pipe 5a connected to the direct contact hot water heater 2 for supplying the hot water supplied to the direct contact hot water heater 2 into the hot water storage tank 1, and a direct contact type carbonate ion absorber 3;
Supply pipe 5b connected to the direct contact type carbonate ion absorber 3 to supply the hot water supplied to the hot water storage tank 1
The supply pipe 5 has a pump 7 and a check valve 10
And a valve 9 are provided. The main supply pipe 5a connected to the direct contact hot water heater 2 and the sub supply pipe 5b connected to the direct contact carbonate ion absorber 3 are independently piped to the hot water storage tank 1. However, it is preferable that the sub-supply pipe 5b connected to the direct contact type carbonate ion absorber 3 is provided with a direct contact type as shown in FIG. It may be a pipe that allows the combustion gas chamber 3a of the carbonate ion absorber 3 to communicate with the hot water storage section 2a of the direct contact hot water heater 2.

Here, the discharge flow rate of the pump 6 installed in the extraction pipe 4 is usually set smaller than the discharge flow rate of the pump 7 installed in the supply pipe 5. 13 is hot water storage tank 1
A cold water supply pipe for newly supplying cold water to be heated when the amount of hot water stored in the hot water storage section 2a of the direct contact hot water heater 2 is reduced when hot water in the inside is reduced or replaced; This cold water supply pipe 13 is connected to the downstream side of the valve 8 provided in the first extraction pipe 4a connected to the direct contact hot water heater 2 as in the illustrated embodiment, so that the number of pipes is reduced. In addition, the control of the valve 8 can be effectively used, which is preferable.

[0014]

When the pumps 6 and 7 are operated to circulate the hot water in the hot water storage tank 1 by the hot water heating and circulating device for the hot water storage tank according to the present invention, first, the hot water in the hot water storage tank 1 is circulated. Is detected by the temperature detector 14,
The valve 8 installed in the first outlet pipe 4a connected to the direct contact hot water heater 2 is controlled. At this time, as shown in the drawing, the take-out pipe 4 is located on the downstream side of the pump 6 and other auxiliary devices.
If it is branched into the outlet pipe 4a and the second outlet pipe 4b,
It is preferable that the pumps 6 and other auxiliary devices can be shared by the outlet pipes 4a and 4b, respectively. The following description will be made based on the illustrated embodiment.

When the temperature of the hot water detected by the temperature detector 14 is lower than a predetermined temperature (for example, 42 to 43 ° C. when the hot water storage tank 1 is a bathtub), a signal from the temperature detector 14 is output. In response, the valve 8 is opened. The hot water taken out of the hot water storage tank 1 is cleaned with a dust remover 12 and a filter dispenser 11 to remove hair, dirt and the like, and then the valve 8 is opened. 6 with the outlet pipe 4a
4b and supplied to the direct contact type hot water heater 2 and the direct contact type carbonate ion absorber 3, respectively. In the direct contact hot water heater 2, the supplied hot water is sprayed onto the heat absorbing chamber 2a and falls directly on the heat absorbing chamber 2c and the side wall of the combustion chamber 2b while being brought into direct contact with the combustion gas to take in carbonate ions and be heated. The hot water is stored in the hot water storage unit 2a as needed and heated.

The direct contact type carbonate ion absorber 3 includes:
The combustion gas whose temperature has decreased through the combustion chamber 2b and the heat absorption chamber 2c of the direct contact hot water heater 2 is supplied to the combustion gas chamber 3a from the exhaust port 2d. Then, the hot water supplied from the second extraction pipe 4b is sprayed onto the heat absorbing chamber 3b of the direct contact type carbonate ion absorber 3, and is supplied to the combustion gas chamber 3a while falling through the heat absorbing chamber 3b and the combustion gas chamber 3a. And directly in contact with the combustion gas to absorb carbonate ions. At this time, as described above, the combustion gas supplied to the combustion gas chamber 3a of the direct contact type carbonate ion absorber 3 passes through the combustion chamber 2b and the heat absorbing chamber 2c of the direct contact type hot water heater 2 and Since the temperature is lowered by being brought into direct contact with the hot water supplied to the hot water, there is almost no effect of heating the hot water. Because of the contact, the hot water acts like a filter, and the combustion gas exhausted from the exhaust port 3c of the direct contact type carbonate ion absorber 3 reduces white smoke. In the case of the illustrated embodiment, the auxiliary supply pipe 5b connected to the direct contact type carbonate ion absorber 3 is connected to the combustion gas chamber 3a and the direct contact type hot water heater 2.
The hot water, which is in direct contact with the combustion gas in the direct contact type carbonate ion absorber 3 and absorbs the carbonate ions, flows through the sub-supply pipe 5b because the pipe is in communication with the hot water storage section 2a. The hot water flows into the hot water storage section 2a of the hot water heater 2 and is heated in a state where the hot water is stored in the hot water storage section 2a as necessary.

Thus, the hot water storage section of the direct contact hot water heater 2
Hot water heated by taking in a large amount of carbonate ions via 2a is supplied into the hot water storage tank 1 by the pump 7 from the supply pipe 5a connected to the direct contact type hot water heater 2 and circulated therein. Can be raised to a desired temperature. At this time, since the discharge flow rate of the pump 6 is set smaller than the discharge flow rate of the pump 7, overflow in the hot water storage section 2a of the direct contact hot water heater 2 is prevented, and when the pump 7 is stopped, the supply pipe 5 ( In the illustrated embodiment, since the check valve 10 is installed in the main supply pipe 5a), the backflow of the hot water is prevented and the overflow of the hot water storage section 2a of the direct contact hot water heater 2 is prevented.

When the temperature of the hot water detected by the temperature detector 14 is higher than a predetermined temperature, the signal from the temperature detector 14 is received and the valve 8 is closed. At this time, the hot water taken out of the hot water storage tank 1 is removed by the pump 6 in a state where the hair, dirt and the like are removed by the auxiliary devices 12 and 11, and the second outlet pipe 4b is
And supplied to the direct contact type carbonate ion absorber 3. If the valve 8 is set so that the hot water flows somewhat even when the valve 8 is closed at this time, the direct contact hot water is supplied. The water supplied to the heater 2 is preferable because a water film is formed in the heat absorbing chamber 2c and the combustion chamber 2b by the supplied hot water, and the water is cooled, so that the burning of the combustion chamber 2b and the heat absorbing chamber 2c can be prevented. The hot water supplied to the direct contact type carbonate ion absorber 3 is sprinkled on the heat absorbing chamber 3b, and the heat absorbing chamber 2c of the direct contact type hot water heater 2 as described above.
The temperature drops through the outlet and the exhaust port 2d of the direct contact hot water heater 2
Hot water storage unit of the direct contact hot water heater 2 through the supply pipe 5b by directly contacting with the supplied combustion gas and absorbing the carbonate ions.
Flow into 2a. The combustion gas supplied from the exhaust port 2d of the direct contact hot water heater 2 has a reduced temperature through the heat absorbing chamber 2c as described above, and has almost no effect of heating the hot water. The hot water flowing into the hot water storage section 2a of the contact hot water heater 2 has a relatively low temperature. Then, the hot water is not stored in the hot water storage section 2a, and the main supply pipe 5a is immediately
The water is circulated by being supplied into the hot water storage tank 1 by the pump 7, and hot water whose temperature is relatively lowered from the extraction pipe 4 mainly through the direct contact type carbonate ion absorber 3 and the supply pipe 5 enters the hot water storage tank 1. Supplied, hot water storage tank 1
The hot water stored therein can be maintained or lowered at a desired temperature.

Further, a cold water supply pipe 13 is connected to a first extraction pipe 4a connected to a direct contact hot water heater 2 for heating cold water to hot water when hot water is newly supplied to the hot water storage tank 1. When the hot water in the hot water storage tank 1 is reduced or replaced, or when the hot water storage tank 1 is
When the amount of hot water stored in the hot water decreases, the cold water is supplied from the cold water supply pipe 13 to the direct contact hot water heater 2, and the direct contact hot water heater 2 comes into direct contact with the combustion gas to remove carbonate ions. The hot water that has been taken in becomes a hot water in a high temperature state and is pumped through the supply pipe 5 by the pump 7 to store the hot water in the hot water storage tank 1.
Can be stored inside.

[0020]

As described in detail above, the apparatus for circulating hot water in a hot water storage tank according to the present invention is applicable to all the hot water circulated so as to be supplied from the hot water storage tank to the hot water storage tank again. Since the direct contact type hot water heater or direct contact type carbonate ion absorber can be brought into direct contact with carbonate ions, the dissolved amount of the warm water carbonate ions stored in the hot water storage tank can always be kept high, In addition, even when the temperature of the hot water stored in the hot water storage tank decreases, the temperature can be raised to a desired temperature with a small amount of heat, and the temperature of the hot water in the hot water storage tank can be efficiently controlled. Further, since the combustion gas generated in the direct contact hot water heater is supplied to the direct contact carbonate ion absorber and then exhausted, white smoke can be reduced.

A discharge pipe is connected to a direct contact hot water heater and a direct contact carbonate ion absorber on the downstream side of a pump and other auxiliary devices installed in the discharge pipe.
And the second extraction pipe, the pump and other ancillary equipment can be used in common for the extraction pipe connected to each direct contact hot water heater and the direct contact carbonate ion absorber. It is economical.

If the outlet pipe connected to the direct contact type hot water heater is provided with a valve for adjusting the flow rate of the hot water to the direct contact type hot water heater according to the temperature of the hot water in the hot water storage tank, The temperature of the hot water in the tank can be controlled efficiently, and if a certain amount of hot water is set to flow even when this valve is closed, the heat absorption chamber and combustion chamber of the direct contact hot water heater can be controlled. Burnout is prevented and safety is improved.

Further, a chilled water supply pipe for newly supplying chilled water to the direct contact hot water heater is connected to a downstream side of a valve provided in a first extraction pipe connected to the direct contact hot water heater. When the hot water in the hot water storage tank is reduced or replaced, or when the amount of hot water stored in the hot water storage section of the direct contact hot water heater is reduced, new cold water to be heated is supplied. Piping can be reduced and valve control can be used effectively. The hot water heating and circulating apparatus for a hot water storage tank according to the present invention, which has various effects as described above, has extremely high industrial value.

[Brief description of the drawings]

FIG. 1 is a system diagram showing one embodiment of a hot water heating and circulating device for a hot water storage tank according to the present invention.

FIG. 2 is a diagram showing one example of a temporal change of the dissolved amount of carbonate ions of the warm water and a temporal change of the temperature of the warm water in the warm water storage tank when the warm water supplied to the warm water storage tank is left.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water storage tank 2 Direct contact type hot water heater 2a Hot water storage part 2b Combustion gas chamber 2c Heat absorption chamber 2d Exhaust port 3 Direct contact type carbonate ion absorber 3a Combustion gas chamber 3b Heat absorption chamber 3c Exhaust port 4 Extraction pipe 4a First extraction pipe 4b Second extraction pipe 5 Supply pipe 5a Main supply pipe 5b Secondary supply pipe 6,7 Pump 8,9 valve 10 Check valve 11 Filtration drug injector 12 Deduster 13 Water supply pipe 14 Temperature detector

Continued on the front page (72) Inventor Toshimichi Ohara 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (56) References JP-A-5-141880 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) F24H 1/18 F24H 1/00 602

Claims (4)

(57) [Claims] A direct contact hot water heater for heating a hot water and / or cold water supplied from a discharge pipe (4) taken out for circulating the hot water in a hot water storage tank (1) by bringing the hot water and / or cold water into direct contact with a combustion gas. (2) and an endothermic material above the combustion gas chamber (3a) which is communicated with an exhaust port (2d) of the direct contact hot water heater (2) and to which combustion gas is supplied from the exhaust port (2d). A heat absorbing chamber (3b) filled with water is provided, and the hot water that is sprayed from above the heat absorbing chamber (3b) and falls and the combustion gas chamber
Direct contact type carbonate ion absorber (3) which makes the hot water absorb carbonate ions by directly contacting the combustion gas supplied to (3a)
A supply pipe (5) for supplying hot water from the direct contact hot water heater (2) and the direct contact carbonate ion absorber (3) is connected to the hot water storage tank (1). A hot water heating and circulating device for a hot water storage tank. 2. A direct-contact hot water heater (2) and a direct-contact carbonate ion absorber (2) are provided downstream of a pump (6) for removing hot water from a hot water storage tank (1). The hot water heating and circulating device for a hot water storage tank according to claim 1, wherein the first water outlet pipe (4a) and the second outlet pipe (4b) connected to (3) are respectively branched. 3. A direct-contact hot-water heater (1) connected to a direct-contact hot-water heater (2) and controlled by the temperature of hot water in a hot-water storage tank (1) to open and close the first outlet pipe (4a). The hot water circulation device for a hot water storage tank according to claim 2, further comprising a valve (8) for adjusting a flow rate of the hot water supplied to 2). 4. A chilled water supply pipe (13) for newly supplying chilled water to a direct contact hot water heater (2) is provided by a direct contact hot water heater.
The hot water heating and circulating device for a hot water storage tank according to claim 3, wherein the device is connected to a downstream side of a valve (8) provided in a first extraction pipe (4a) connected to (2).