JP3504299B2 - Carbonated water heater - Google Patents

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 path for supplying water from a water supply path to a supplied portion by passing through a heat exchanger equipped with a hot water supply burner, and an exhaust gas from the hot water supply burner. An exhaust contact path that passes water from the water supply path to the supply target section by passing through the liquid contact section, a flow detection unit that detects water flow in the water supply path, and a hot water supply start command. A hot water supply valve that opens and closes the hot water supply path and an exhaust contact valve that opens and closes the exhaust gas contact path, and
As the water flow is detected by the flow detection means,
And a control means for starting combustion of the hot water supply burner.

[0002]

2. Description of the Related Art In a carbonated water heater as described above, conventionally, a control means simultaneously opens a hot water supply valve for opening and closing a hot water supply path and an exhaust contact valve for opening and closing an exhaust gas contact path. At the same time, the hot water supply burner is configured to start burning when the flow detection means detects the flow of water in the water supply path by opening the hot water supply valve and the exhaust contact valve.

[0003]

However, when the hot water supply valve and the exhaust contact valve are simultaneously opened on the basis of the hot water supply start command, when the hot water supply valve has a failure that does not open (so-called closed failure). Even if water is not flowing through the heat exchanger due to a closed failure of the hot water supply valve, the flow contact detecting means detects the flow of water in the water supply path by opening the exhaust contact valve, and the control device However, due to the detection, combustion of the hot water supply burner is started without water flowing to the heat exchanger, which may cause abnormal heating of the heat exchanger and damage various equipment such as the heat exchanger. It was a thing.

An object of the present invention is to provide a safe and highly reliable carbonated water heating apparatus which prevents abnormal heating of the heat exchanger caused by a closed failure of the hot water supply valve.

[0005]

A carbonated hot water supply apparatus according to the present invention includes a hot water supply path for supplying water from a water supply path to a supply target part through a heat exchanger having a hot water supply burner, and the hot water supply burner. An exhaust gas contact path for supplying water from the water supply path to the supply target section by passing through a gas-liquid contact section through which the exhaust gas passes, and a flow-through detection means for detecting water flow through the water supply path. A hot water supply valve that opens and closes the hot water supply path and an exhaust contact valve that opens and closes the exhaust gas contact path are opened based on a hot water supply start command, and water flow is detected by the flow detection means. And a control means for starting combustion of the hot water supply burner,

In the first characteristic configuration, the control means opens only the hot water supply valve based on the hot water supply start command, and in this state, the flow detection means detects the flow of water. The exhaust contact valve is opened, and the combustion of the hot water supply burner is started.

A second characteristic structure is provided with temperature detecting means for detecting the temperature of the hot water inside or near the heat exchanger or the temperature of the heat exchanger, and the control means controls the temperature during hot water supply. The hot water supply is stopped when the temperature detected by the detection means exceeds a predetermined value.

[0008]

According to the first characteristic configuration of the present invention, the control means opens only the hot water supply valve that opens and closes the hot water supply path before the exhaust contact valve that opens and closes the exhaust gas contact path based on the hot water supply start command. Therefore, it becomes possible to determine whether or not the hot water supply valve is opened based on the detection result of the flow detection means in that state. Then, the control means opens the exhaust contact valve to pass the water to the gas-liquid contact portion when the flow detection means detects the flow of water to the heat exchanger with only the hot water supply valve opened. At the same time, the hot water supply burner starts to burn. Further, when the water flow detecting means does not detect the flow of water to the heat exchanger, it judges that the hot water supply valve has a closed failure and stops the carbonated hot water filling operation. As a result, combustion of the hot water supply burner will not start without water being supplied to the heat exchanger.

By the way, as a method of detecting whether or not water has flowed to the heat exchanger, the position of attachment of the flow detection means is changed so that the flow detection means allows water to flow to the heat exchanger. It may be possible to detect only the amount of water supplied, but in this case, there arises an inconvenience in that the entire amount of water supplied to the supplied portion cannot be detected. Further, it is conceivable to provide a dedicated flow detection means for detecting only the flow of water to the heat exchanger, but the inconvenience such as the increase in cost due to the addition of new parts and the complicated control configuration may occur. become.

According to the second characteristic construction of the present invention, even when the hot water supply valve is closed during hot water supply and the heat exchanger is in an abnormally heated state, the temperature detecting means causes the heat exchanger to abnormally heat up. Therefore, the temperature that is higher than a predetermined value that is higher than the temperature when water is flowing through the heat exchanger is detected, and the control means stops the hot water supply based on the detection.

[0011]

According to the first characteristic configuration of the present invention, by simply performing a simple control such as opening the hot water supply valve before the exhaust contact valve, the cost is increased by adding new parts and the control configuration is improved. It is possible to determine whether or not the hot water supply valve has a closing failure at the start of hot water supply without causing inconvenience such as complication. Further, when it is determined that the hot water supply valve has a closed failure, the execution of carbonated hot water supply is stopped, so the combustion of the hot water supply burner is not started without water flowing to the heat exchanger, and the heat exchanger There is no risk of damaging various devices such as heat exchangers due to abnormal heating.
Therefore, by improving the simple control configuration that effectively uses the existing equipment, it is possible to provide a safe and highly reliable carbonated water heater capable of preventing abnormal heating of the heat exchanger caused by the closing failure of the hot water supply valve at the start of hot water supply. Came to.

According to the second characteristic configuration of the present invention, even if the hot water supply valve is closed and the heat exchanger is abnormally heated during hot water supply, the temperature detecting means keeps the temperature above the predetermined value. When it detects it, the control means determines that the heat exchanger is in an abnormal heating state and stops hot water supply.Therefore, even during hot water supply, the heat exchanger is in an abnormal heating state due to a closing failure of the hot water supply valve. There is no risk of damaging various devices such as heat exchangers. Therefore, it is possible to provide a safer and more reliable carbonated water heating apparatus capable of preventing abnormal heating of the heat exchanger caused by the closing failure of the hot water supply valve even during hot water supply.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the carbonated water heating apparatus includes a hot water supply unit A that supplies water or hot water to a hot water tap 2 or a bathtub 1 as a supply target Z, and a reheating unit that heats the water or hot water stretched in the bathtub 1. B, a control unit C as a control means for controlling the operation of the hot water supply unit A, the reheating unit B, etc., a gas-liquid contact unit D for dissolving carbon dioxide gas in water, and water or hot water to the bathtub 1 or the tap 2 And a remote controller R for giving a command to the control unit C, and the like. For example, general hot water supplying hot water to the tap 2 can be performed, normal hot water supplying to the bathtub 1 can be performed, and carbonated hot water can be supplied to the bathtub 1 by dissolving carbon dioxide gas.

The hot water supply unit A includes a hot water supply burner 3 and a hot water supply burner 3.
Of the hot water supply fan 4 for supplying combustion air to the hot water supply heat exchanger 5 for heating water by high-temperature exhaust from the hot water supply burner 3 as a part of the supply path E, and the hot water supply heat exchanger 5 as a part of the supply path E. A water supply path 6 connected to the water inlet, a hot water supply path 7 connected to the hot water outlet of the hot water heat exchanger 5 as a part of the supply path E, a hot water supply gas supply path 8 for supplying fuel gas to the hot water supply burner 3, etc. It is composed by. In the water supply path 6, a water amount sensor 9 as a flow detection means for detecting water flow in the water supply path 6 and the amount of water supplied to the bathtub 1 or the tap 2 and a water temperature sensor 1 for detecting the water temperature of the water supply path 6.
0, a water amount adjusting valve 1 for adjusting the amount of water supplied to the hot water supply heat exchanger 5
1 is provided. The hot water supply heat exchanger 5 is provided in the hot water supply path 7.
Hot water temperature sensor 12 as a temperature detecting means for detecting hot water temperature from hot water, a mixing valve 13 for mixing water from hot water supply path 6 into hot water supply path 7 and supplying it to bath 1 or hot water tap 2, and from mixing valve 13 to hot water bath 1 or a hot water supply temperature sensor 14 for detecting the hot water temperature supplied to the hot water tap 2. Further, the hot water supply path 7 is located at a position downstream of the hot water supply temperature sensor 14,
It is branched into a bathtub hot water supply path 7A for supplying hot water to the bathtub 1 and a hot water tap hot water supply path 7B for supplying hot water to the hot water tap 2. The bathtub hot water supply path 7A is provided with a normal hot water supply valve 15 that is opened when the bathtub 1 is normally filled with hot water. The hot-water tap hot water supply path 7B is provided with a flow sensor 16 that instructs the controller C to start the operation of the hot-water supply section A by detecting the flow of water or hot water in the hot-water tap hot water supply path 7B. The hot water supply gas supply passage 8 is branched from the gas supply passage F, and the hot water supply gas supply passage 8 is provided with a hot water supply gas on-off valve 17 for intermittently supplying fuel gas to the hot water supply burner 3 and a fuel to the hot water supply burner 3. A hot water supply gas amount adjustment valve 18 for adjusting the supply amount of gas is provided.

The reheating section B is a reheating burner 19, a reheating fan 20 for supplying combustion air to the reheating burner 19, and water or hot water spread in the bathtub 1 due to high-temperature exhaust from the reheating burner 19. An additional heating heat exchanger 21 for heating, a circulation path 22 for circulating water or hot water in the bath 1 between the bath 1 and the additional heating heat exchanger 21, and an additional supply for supplying fuel gas to the additional heating burner 19. The gas supply path 23 and the like are used. In the circulation path 22, a bath water level sensor 24 for detecting the water level of the water or hot water in the bath 1, a bath hot water temperature sensor 25 for detecting the temperature of the water or hot water in the bath 1, and the bath 1
A circulation pump 26 that circulates the water or hot water stretched in the bathtub 1 is provided between and the additional heat exchanger 21. The additional heating gas supply path 23 is branched from the gas supply path F,
The reheating gas supply passage 23 has a reheating gas opening / closing valve 27 for intermittently supplying the fuel gas to the reheating burner 19 and a reheating gas amount adjusting valve for adjusting the supply amount of the fuel gas to the reheating burner 19. 28 are provided.

The gas-liquid contact portion D is part of the supply path E and is in the middle of the exhaust contact path 6A branched at a position downstream of the water temperature sensor 10 of the water supply path 6 and from the hot water supply burner 3. It is provided at a position where exhaust gas passes. From the hot water supply burner 3 to the gas-liquid contact portion D, the spray nozzle 29 for spraying water from the exhaust gas contact path 6A and the water sprayed by the spray nozzle 29 and the exhaust gas from the hot water supply burner 3 are brought into contact with each other. A discharge port 30 for discharging the exhaust gas is provided.
That is, the gas-liquid contact portion D contacts the water sprayed by the spray nozzle 29 and the exhaust gas from the hot water supply burner 3 to dissolve the carbon dioxide gas in the exhaust gas into the water. On the upstream side of the gas-liquid contact portion D in the exhaust gas contact path 6A, an exhaust contact valve 31 for spraying water with the spray nozzle 29 to bring the water into contact with the exhaust gas by opening the exhaust gas contact path 6A, and the exhaust contact. Constant flow valve 3 that keeps the amount of water flowing through the working path 6A constant
2 is provided. On the downstream side of the gas-liquid contact portion D in the exhaust gas contact path 6A, water is stored in the exhaust gas contact path 6A so that the exhaust gas from the hot water supply burner 3 is in a gaseous state. A stored water sealing portion 34 that suppresses the flow of water is provided.

On the other hand, a hot water supply temperature sensor 12 is provided in the hot water supply path 7.
The branch hot water supply path 7C is branched at a position downstream of the mixing valve 13 and upstream of the mixing valve 13. The branch hot water supply path 7C is provided with a carbonated hot water supply valve 35 as a hot water supply valve that is opened when the bathtub 1 is filled with carbonated hot water. Below the carbon dioxide hot water supply valve 35, there is provided a hopper 36 that causes the hot water supply path 7 to flow down while supplying water or hot water from the carbon dioxide hot water supply valve 35 or the normal hot water supply valve 15 and supplies the hot water to the bathtub 1. The water or hot water from the hopper 36 and the stored water sealing portion 34 are provided on the downstream side of the stored water sealing portion 34 in the exhaust contact path 6A.
A lower tank 37 is provided which separates the undissolved exhaust by mixing with the exhaust contact water from. Further, the lower end of the exhaust contact path 6A is connected to the circulation path 22 at a position upstream of the bath water temperature sensor 25 in the circulation path 22 of the additional heating section B.

The gas supply passage F is provided with an original gas on-off valve 38 for intermittently supplying the fuel gas to the hot water supply burner 3 and the additional heating burner 19.

The remote controller R has a normal hot water filling switch 39 for issuing a hot water supply start command for normal hot water filling to the control unit C, and a carbonated hot water hot water filling for issuing a hot water supply start command for carbonated hot water filling to the control unit C. A switch 40 and a heating switch 41 for issuing a heating start command to the control unit C are provided.

The control section C starts the operation of the normal hot water filling control by pressing the normal hot water filling switch 39, and starts the operation of the carbonate hot water filling control by pressing the normal water hot water filling switch 40. Then, when the additional heating switch 41 is pressed, the additional heating control operation is started. Further, the control unit C is configured to start the operation of the general hot water supply control when the flow sensor 16 detects the flow of water or hot water in the hot water tap hot water supply path 7B accompanying the opening of the hot water tap 2. ing.

In the case of the normal hot water filling control, the normal hot water supply valve 15 is first opened based on the hot water supply start command for the normal hot water filling. In this state, when the water flow sensor 6 detects the flow of water through the water amount sensor 9, the operation of the source gas on-off valve 38, the hot water supply gas on-off valve 17, etc. is controlled to start the combustion of the hot water supply burner 3. When combustion starts, hot water temperature sensor 1
The operations of the hot water supply gas amount adjusting valve 18, the mixing valve 13 and the like are controlled so that the hot water temperature from the mixing valve 13 detected at 4 becomes a desired hot water supply temperature. When the water level of the bathtub 1 detected by the bathtub water level sensor 24 reaches a predetermined water level, the original gas opening / closing valve 38 and the hot water supply gas opening / closing valve 17 are closed to stop the combustion of the hot water supply burner 3 and the normal hot water supply valve 15 Is closed to stop hot water supply to the bathtub 1.

In the case of carbonated hot water filling control, first, the carbonated hot water supply valve 35 is opened based on a hot water supply start command for carbonated hot water filling. When the water flow sensor 6 detects the flow of water in the water supply path 6 in that state, the exhaust gas contact valve 31 is opened, and the operations of the original gas on-off valve 38 and the hot water supply gas on-off valve 17 are controlled to control the hot water supply burner. 3. Combustion of 3 is started. When the combustion is started, the operations of the hot water supply gas amount adjusting valve 18 and the water amount adjusting valve 11 are controlled so that the hot water temperature from the lower tank 37 detected by the bath water temperature sensor 25 becomes a desired hot water supply temperature. When the water level of the bathtub 1 detected by the bathtub water level sensor 24 reaches a predetermined water level, the original gas opening / closing valve 38
Also, the hot water supply gas on-off valve 17 is closed to stop the combustion of the hot water supply burner 3, and the carbon dioxide hot water supply valve 35 and the exhaust contact valve 3
1 is closed and hot water supply to the bathtub 1 is stopped.

In the case of the additional heating control, the operation of the original gas opening / closing valve 38, the additional heating gas opening / closing valve 27, etc. is controlled on the basis of the additional heating start command to start the combustion of the additional heating burner 19 and the circulation pump. 26 is activated. Then, when the hot water temperature of the bathtub 1 detected by the hot water bath temperature sensor 25 reaches a desired hot water temperature of the bathtub, the original gas opening / closing valve 38 and the additional heating gas opening / closing valve 27 are closed to stop the combustion of the additional heating burner 19. It is designed to let you.

In the case of general hot water supply control, when the flow of water or hot water in the hot water tap hot water supply path 7B is detected by the flow sensor 16 as the hot water tap 2 is opened, the source gas is detected based on the detection. The operation of the on-off valve 38 and the hot water supply gas on-off valve 17 is controlled to start combustion of the hot water supply burner 3. When combustion is started, the mixing valve 1 detected by the hot water temperature sensor 14
The operations of the hot water supply gas amount adjusting valve 18 and the mixing valve 13 are controlled so that the hot water temperature from 3 reaches a desired hot water supply temperature. Then, when the flow of water or hot water in the hot water tap hot water supply path 7B is no longer detected by the flow sensor 16 as the hot water tap 2 is closed, the main gas on-off valve 38 and the hot water gas on-off valve 17 are closed and the hot water burner 3 is closed. It is designed to stop the combustion of.

Further, the control section C detects a closing failure of the normal hot water supply valve 15 and the carbonated hot water supply valve 35 (a failure in which the valves are in a closed state) with the start of each hot water filling control, and the hot water supply heat It is configured to execute abnormal heating prevention control for preventing abnormal heating of the exchanger 5. Hereinafter, the operation of the control unit C by the abnormal heating prevention control will be described based on the flowchart of FIG. First, it is judged whether the hot water supply start command is normal hot water or carbonated hot water [step # 1]. When the hot water supply start command is normal hot water filling, the normal hot water supply valve 15 is opened, and it is determined whether or not the water supply amount detected by the water amount sensor 9 is equal to or more than a predetermined value (for example, 2.5 liters / minute) [ Steps # 2, # 3]. If it is less than the predetermined value, it is determined whether a predetermined time (for example, 15 seconds) has elapsed [Step #
4]. If the predetermined time has not elapsed, the process returns to step # 2. When the predetermined time has elapsed, it is determined that the normal hot water supply valve 15 has a closed failure, and the normal hot water filling is terminated [Step #
5]. When the amount of water supply is equal to or larger than the predetermined value in step # 3, the hot water supply burner 3 is started to burn to start normal filling (step # 6). When the normal hot water filling is started, it is determined whether or not the temperature detected by the hot water temperature sensor 12 is equal to or higher than a predetermined temperature (for example, 85 ° C.) as a predetermined value [step # 7]. When the temperature is lower than the predetermined temperature, combustion of the hot water supply burner 3 is continued and normal hot water filling is continued. When the temperature is equal to or higher than the predetermined temperature, the combustion of the hot water supply burner 3 is stopped and the normal hot water filling is finished [step # 8]. On the other hand, when the hot water supply start command is carbonated hot water filling in step # 1, the carbonated hot water supply valve 3
5 is opened, and it is determined whether or not the water supply amount detected by the water amount sensor 9 is a predetermined value (for example, 2.5 liters / minute) or more [steps # 9, # 10]. If it is less than the predetermined value, it is judged whether or not a predetermined time (for example, 15 seconds) has elapsed [step # 11]. If the predetermined time has not elapsed, the process returns to step # 9. When the predetermined time has elapsed, it is determined that the carbonated hot water supply valve 35 has a closed failure, and the carbonated hot water filling is terminated [step # 12]. When the amount of water supply is equal to or larger than the predetermined value in step # 10, the exhaust contact valve 31 is opened and the hot water supply burner 3 is started to burn to start carbonated hot water filling (steps # 13 and 14). When the carbonated hot water filling is started, it is determined whether the temperature detected by the hot water temperature sensor 12 is equal to or higher than a predetermined temperature (for example, 85 ° C.) [step # 15]. When the temperature is lower than the predetermined temperature, combustion of the hot water supply burner 3 is continued to continue carbon dioxide filling. When the temperature is equal to or higher than the predetermined temperature, the combustion of the hot water supply burner 3 is stopped, the exhaust contact valve 31 is closed, and the carbonated hot water filling is completed [Step #
16, # 17]. In other words, based on the hot water supply start command for carbonated hot water filling, only the carbonated water hot water supply valve 35 is opened to detect the closing failure of the carbon dioxide hot water supply valve 35, thereby preventing abnormal heating of the hot water heat exchanger 5. There is.

[Other Embodiments] The present invention is not limited to the above embodiments, but can be applied to various forms. Other examples will be listed below. In the above-described embodiment, the bathtub 1 is shown as the supplied portion Z for supplying carbonated hot water, but the present invention is not limited to this. For example, a shower, which is an example of the hot water tap 2, may be used as the supplied portion Z. Good. The remote controller R may be provided with a display unit for displaying the content of the abnormality, and when the closing failure of the carbonated water heating valve 35 or the like is detected, the content of the abnormality may be displayed. A bimetal, a thermistor, or the like can be used as the temperature detecting means 12. In the above embodiment, the hot water outlet temperature sensor 12 is used as the temperature detecting means, but the hot water temperature inside the hot water supply heat exchanger 5 is detected, or the temperature of the hot water supply heat exchanger 5 is detected. You may make it provide a new thing.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a carbonated water heater.

FIG. 2 is a flowchart of abnormal heating prevention control.

[Explanation of symbols]

C control means D Gas-liquid contact part Z supplied part 3 hot water supply burner 6 water supply routes 6A Exhaust contact route 7 Hot water supply route 9 Current detection means 12 Temperature detection means 31 Exhaust contact valve 35 Hot water supply valve

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuya Kitagawa 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Within Osaka Gas Co., Ltd. (72) Inventor Shigenobu Okuda 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka 1-2 In Osaka Gas Co., Ltd. (72) Inventor Kensaku Inoue 1-152 Oka Minami-shi Minato-ku, Osaka-shi, Osaka Prefecture 1-252 Herman Co., Ltd. (72) Yoshihisa Fujita 1-chome Mina-shi Oka, Minato-ku, Osaka Prefecture Osaka Prefecture No. 52 Harman Co., Ltd. (56) Reference JP-A-6-137669 (JP, A) JP-A-2-279948 (JP, A) JP-A-2-13716 (JP, A) JP-A-5- 141880 (JP, A) JP 62-66053 (JP, A) Actual development 61-170856 (JP, U) Actual development 59-7344 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24H 1/00 301

Claims (2)

(57) [Claims] 1. A hot water supply passage (7) for supplying water from a water supply passage (6) to a supply target portion (Z) through a heat exchanger having a hot water supply burner (3); An exhaust contact path (6A) for supplying water from the water supply path (6) to the supply target section (Z) through the gas-liquid contact section (D) through which the exhaust gas from 3) passes.
A flow detection means (9) for detecting water flow in the water supply path (6); a hot water supply valve (35) for opening and closing the hot water supply path (7) and the exhaust contact based on a hot water supply start command. The exhaust contact valve (31) that opens and closes the service path (6A) is opened, and combustion of the hot water supply burner (3) is performed as the flow of water is detected by the flow detecting means (9). A carbon dioxide hot water supply device provided with a control means (C) for starting, wherein the control means (C) opens only the hot water supply valve (35) on the basis of a hot water supply start command, and in the state, the flow of water is started. Carbon dioxide hot water supply configured to open the exhaust contact valve (31) and start combustion of the hot water supply burner (3) in accordance with the detection of the flow of water by the detection means (9). apparatus. 2. A temperature detecting means (12) for detecting hot water temperature inside or near the heat exchanger (5) or temperature of the heat exchanger (5) is provided, and the control means (C) is provided. The carbon dioxide hot water supply apparatus according to claim 1, wherein the hot water supply is stopped when the temperature detected by the temperature detecting means (12) reaches or exceeds a predetermined value during hot water supply.