JPH0525249U - Water heater - Google Patents

Abstract

(57) [Summary] [Purpose] In a hot water supply device configured to prevent a cold water sandwich, in order to save energy and improve durability as compared with the past. [Structure] Water supplied from a water supply port 4 into a tank is made to flow through a tank bottom side to a drain port 5, and a hot water storage tank 3 having a hot water supply port 6 at the upper part of the tank and a heating means 1
A water heating heat exchanger 2, a circulation pump 7 for returning water from the drain port 5 to the water heating heat exchanger 2 and returning the water to the hot water storage tank 3, and the hot water storage tank 3, a hot water temperature detecting means 22 for detecting the hot water temperature of the bottom portion of the inside of 3, and the operation of the heating means 1 and the circulation pump 7 so as to maintain the hot water temperature above a set value based on the information of the hot water temperature detecting means 22. And a control means C for controlling the above, the hot water storage tank 3 is disposed above the water heating heat exchanger 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention allows water supplied from the water supply port into the tank to flow to the drain port through the bottom side of the tank, and a hot water storage tank provided with a hot water supply port at the top of the tank and water for heating water heated by the heating means. A heat exchanger, a circulation pump that allows water from the drain port to flow through the water heating heat exchanger and returns to the hot water storage tank, and hot water temperature detection means for detecting the hot water temperature at the bottom of the hot water storage tank. And a control means for controlling the operation of the heating means and the circulation pump so as to maintain the hot water temperature above a set value based on the information of the hot water temperature detecting means.

[0002]

[Prior Art]

 This type of hot water supply device is a cold water sandwich phenomenon that occurs when the hot water tap connected to the hot water inlet is opened, the hot water tap is once closed, and then the hot water tap is opened again. When the flow of water is stopped, the hot water in the water heating heat exchanger is heated to a temperature higher than the set value due to preheating, and if the hot water tap is opened in that state, Hot water with a high set temperature comes out, and after that, hot water with a temperature that is considerably lower than the set temperature due to the delayed heating response of the heat exchanger for water heating appears for a while, and then the hot water with the normal set value comes out. This is to prevent the phenomenon. In other words, since hot water with a hot water temperature above the set value is always stored in the hot water storage tank, when the hot water tap is opened, the hot water tap is once closed, and then the hot water tap is opened again as described above. However, hot water with a temperature higher than the set value and water that comes out after that and is considerably lower than the set temperature is mixed with the hot water in the hot water storage tank and the hot water temperature is averaged, so the cold water sandwich phenomenon occurs. Can be prevented. By the way, in the past, the hot water storage tank was arranged below the heat exchanger for heating water.

[0003]

[Problems to be solved by the device]

 However, in the conventional hot water supply system, the hot water storage tank is located below the water heating heat exchanger, so the hot water tap is closed, that is, the hot water temperature in the hot water storage tank is maintained above the set value. While the heating means and the circulation pump are not operating, the temperature of the water heating heat exchanger decreases and the temperature of the hot water in the water heating heat exchanger remains in the hot water storage tank. When the temperature of the hot water becomes lower than that of the hot water, the hot water in the water heating heat exchanger flows down to the hot water storage tank, the hot water in the hot water storage tank rises to the water heating heat exchanger, and the temperature drops. On the contrary, the heat exchanger for heating water serves as a radiator to radiate the hot water in the heat exchanger for heating water, so that the rate of decrease of the hot water in the hot water storage tank becomes faster and the heating means Operation time becomes longer and energy loss increases, and heating means and circulation Operation and stopping of the pump there is a problem that often happens is that when a durability of the apparatus is deteriorated becomes. The present invention has been made in view of such circumstances, and an object thereof is to save energy and improve durability in this type of water heater.

[0004]

[Means for Solving the Problems]

 A characteristic configuration of the hot water supply apparatus according to the present invention is that the hot water storage tank is arranged above the water heating heat exchanger.

[0005]

[Action]

 According to the above characteristic configuration, while the hot water tap is closed, that is, during the period in which the hot water temperature in the hot water tank is controlled to be maintained above the set value, the heating means and the circulation pump are stopped. , Even if the temperature of the water heating heat exchanger drops and the hot water temperature in the water heating heat exchanger becomes lower than the hot water temperature in the hot water storage tank, Since it is also placed above, it is possible to prevent hot water in the hot water storage tank that has a higher hot water temperature than the hot water in the water heating heat exchanger from flowing down to the water heating heat exchanger, It is possible to suppress heat radiation by the heat exchanger for heating hot water as much as possible.

[0006]

[Effect of the device]

 As a result, the operating time of the heating means can be shortened compared to before, energy can be saved, and the number of times of operation / stop of the heating means and the circulation pump can be greatly reduced compared to before. As a result, the durability can be improved.

[0007]

【Example】

 Next, an embodiment will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a hot water supply device, where 1 is a gas burner as a heating means, 2 is a heat exchanger for heating water which is heated by a gas burner 1, and 3 is a water supply port 4 which supplies water to a tank. It is a hot water storage tank in which the generated water is made to flow to the drain port 5 through the bottom side of the tank, and the hot water supply port 6 is provided at the upper part of the tank. The hot water storage tank 3 is located above the water heating heat exchanger 2. It is located at.

In order to cause the water supplied from the water supply port 4 of the hot water storage tank 3 to flow on the tank bottom side and to be supplied from the drain port 5 to the upstream side of the water heating heat exchanger 2, the drain port 5 and the water heating heat In order to connect the upstream side of the exchanger 2 with the first flow path 9 and to supply the hot water heated by the water heating heat exchanger 2 to the upper portion of the hot water storage tank 3, the downstream side of the water heating heat exchanger 2 The hot water storage tank 3 is connected to the hot water storage tank 3 by the second flow path 11. Then, the hot water supply port 6 and the hot water supply tap 16 are connected by a hot water supply passage 17 so that the hot water in the hot water storage tank 3 is supplied from the upper part of the tank through the hot water supply plug 16.

In the figure, 7 is a circulation pump that allows water from the drainage port 5 to flow through the water heating heat exchanger 2 through the first flow path 9 and returns into the tank 3 through the second flow path 11. Reference numeral 8 is a flow switch for detecting the flow of water in the first flow path 9. Reference numeral 10 is a valve interposed in the second flow passage 11, and the second flow passage 11 is connected to the third flow passage 13 closed by the plug 12. The valve 10 is in the open state. Further, in the drawing, reference numerals 14 and 15 are straightening vanes for preventing water flowing from the water supply port 4 to the water discharge port 5 on the bottom side of the tank from mixing with the hot water in the upper part of the tank.

The fuel gas supply passage 18 for the gas burner 1 is provided with an electromagnetic valve 19 for intermittently supplying the fuel gas and an electromagnetic proportional valve 20 for adjusting the fuel gas supply amount. In the figure, 21 is a spark plug for the gas burner 1.

In the figure, 22 is a first hot water temperature detection sensor as hot water temperature detecting means for detecting the hot water temperature at the bottom of the hot water storage tank 3, and 23 is the hot water temperature of the hot water heated by the water heating heat exchanger 2. It is a second hot water temperature detecting sensor for detecting.

In the figure, C is a control device as a control means, and this control device C is adapted to execute hot water supply control, hot water temperature control in the hot water storage tank 3, and so on. Control and hot water temperature control in the hot water storage tank 3 will be described.

In the hot water supply control, water is supplied from the water supply port 4 into the hot water storage tank 3 as the hot water tap 16 is opened, and the temperature detected by the first hot water temperature detection sensor 22 becomes equal to or lower than the set value. Based on the above, the circulation pump 7 is operated. When the circulation pump 7 is operated and water flows through the first flow path 9, the flow switch 8 detects the flow of water through the first flow path 9, and the solenoid valve 19 opens. While being supplied with the fuel gas, the spark plug 21 is operated to ignite the gas burner 1 and hot water supply from the hot water tap 16 is started. The hot water temperature to be supplied is detected by the second hot water temperature detection sensor 23. The opening degree of the proportional valve 20 is adjusted based on the information from the second hot water temperature detection sensor 23 to determine the hot water temperature to be supplied. It is maintained at the set value.

Subsequently, when the hot water supply plug 16 is closed and the hot water supply is stopped, the hot water temperature control in the hot water storage tank 3, that is, the hot water in the hot water storage tank 3 based on the information from the first hot water temperature detection sensor. The operation of the gas burner 1 and the circulation pump is controlled so as to maintain the temperature above the set value.

That is, even after the hot water supply plug 16 is closed and hot water supply is stopped, the ignition of the gas burner 1 and the operation of the circulation pump 7 continue until the temperature detected by the first hot water temperature detection sensor 22 reaches the set value. Then, the water or hot water from the drain port 5 is circulated and heated in the circulation path that circulates through the first flow path 9, the water heating heat exchanger 2, the second flow path 11, and the hot water storage tank 3, When the temperature detected by the first hot water temperature detection sensor 22 reaches the set value, the circulation pump 7 is stopped, the solenoid valve 19 is closed, and the gas burner 1 is extinguished. The hot water temperature that is heated by the water heating heat exchanger 2 and supplied to the hot water storage tank 3 is detected by the second hot water temperature detection sensor 23. 2 The opening of the proportional valve 20 is adjusted based on the detection information of the hot water temperature detection sensor 23.

After that, the following control is repeated on the basis that the temperature detected by the first hot water temperature detection sensor 22 becomes lower than the set value. That is, when the circulation pump 7 is actuated and the flow switch 8 detects the flow of water in the first flow passage 9, the electromagnetic valve 19 is opened and the fuel gas is discharged. When being supplied, the spark plug 21 is operated to ignite the gas burner 1, and water or hot water from the drain port 5 is supplied to the first flow path 9, the water heating heat exchanger 2, and the second flow path 11. When the temperature is detected by the first hot water temperature detection sensor 22 and reaches the set value, the circulation pump 7 is stopped and the solenoid valve 19 is closed. Sverner 1 is extinguished. The hot water temperature heated by the water heating heat exchanger 2 and supplied to the hot water storage tank 3 is detected by the second hot water temperature detection sensor 23. 2 The opening of the proportional valve 20 is adjusted based on the information detected by the hot water temperature sensor 23.

FIG. 2 is a diagram showing a configuration when the above-described hot water supply device is installed in parallel with a storage tank for use, and will be described below with reference to FIG.

In the figure, reference numeral 31 is a storage tank, which supplies water from an upper hot water supply port 32 and supplies water from a lower water supply port 33 into the storage tank 31. In order to supply water or hot water in the lower part of the storage tank 31 from the water supply port 4 of the hot water storage tank 3 into the hot water storage tank 3, the storage tank 31 and the water supply port 4 are connected by the water supply passage 34, and a heat exchanger for water heating is connected. The hot water heated in 2 should not be supplied to the storage tank 31, and the third flow path 13 from which the plug 12 is removed is connected to the storage tank 31. The valve 10 provided in the second flow path 11 is in the closed state. In the figure, 35 is a third hot water temperature detecting sensor for detecting the temperature of water or hot water in the lower part of the storage tank 31, and 36 is an automatic air vent valve.

Based on the detected temperature of the third hot water temperature detection sensor 35 being lower than the set value so that the hot water temperature of the hot water in the storage tank 31 is maintained at the set value or higher, the control device C Causes the following control to be repeated. That is, when the circulation pump 7 is operated and the flow switch 8 detects the flow of water in the first flow passage 9, the electromagnetic valve 19 is opened to supply the fuel gas. At the same time, the spark plug 21 is actuated to ignite the gas burner 1, and the water or hot water from the drain port 5 flows through the first flow path 9, the water heating heat exchanger 2, the third flow path 13, the storage tank. When the temperature is detected by the third hot water temperature detection sensor 35 and reaches the set value, the circulating pump 7 is stopped and the electromagnetic pump is stopped. The valve 19 is closed and the gas burner 1 is extinguished. The hot water temperature heated by the water heating heat exchanger 2 and supplied to the storage tank 31 is detected by the second hot water temperature detection sensor 23, so that the hot water temperature is maintained at the set value. The opening degree of the proportional valve 20 is adjusted based on the detection information of the second hot water temperature detection sensor 23.

FIG. 3 is a diagram showing a configuration when the above-described hot water supply device is used for immediate hot water supply, and will be described below with reference to FIG.

The hot water supply port 6 of the hot water storage tank 3 and the hot water taps 41, 42 in the hot water supply device are connected by the hot water supply passage 43, and the hot water supply passage 43 and the third flow passage 13 from which the plug 12 is removed are connected to the return passage. 44, the hot water from the hot water supply port 6 is supplied from the hot water taps 41 and 42 through the hot water supply passage 43, and the return flow passage 44, the third flow passage 13 and the second flow passage 11 are sequentially connected to store a hot water storage tank. It is set back to 3. The valve 10 is in the open state. In the figure, reference numeral 45 denotes a second circulation port for circulating hot water from the hot water supply port 6 through a circulation path that circulates through the hot water supply path 43, the return flow path 44, the third flow path 13, the second flow path 11, and the hot water storage tank 3. Pumps 46 and 47 are check valves.

The hot water from the hot water supply port 6 is circulated by the second circulation pump 45 through the hot water supply passage 43, the return flow passage 44, the third flow passage 13, the second flow passage 11, and the hot water storage tank 3. The hot water temperature of the hot water returning to the hot water storage tank 3 is detected by the first hot water temperature detection sensor 22, and the control device C controls the first hot water temperature so that the hot water temperature is maintained at the set value. The following control is repeated based on the temperature detected by the detection sensor 22 becoming lower than the set value. That is, when the circulation pump 7 is operated and the flow switch 8 detects the flow of water in the first flow passage 9, the solenoid valve 19 is opened to open the fuel. As the gas is supplied, the spark plug 21 is activated and the gas burner 1 is ignited, and the hot water from the drain port 5 flows through the first flow path 9, the water heating heat exchanger 2, the second flow path 11, the hot water storage tank. When the temperature of the first hot water temperature sensor 22 reaches the set value, the circulation pump 7 is stopped and the solenoid valve 19 is closed to turn the gas burner 1 on. Extinguished. The hot water temperature that is heated by the water heating heat exchanger 2 and supplied to the hot water storage tank 3 is detected by the second hot water temperature detection sensor 23, so that the hot water temperature is maintained at the set value. The opening degree of the proportional valve 20 is adjusted based on the detection information of the second hot water temperature detection sensor 23.

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

[Brief description of drawings]

FIG. 1 is a block diagram of a water heater

FIG. 2 is a configuration diagram showing a usage example of a water heater.

FIG. 3 is a configuration diagram showing another usage example of the water heater.

[Explanation of symbols]

 1 Heating Means 2 Water Heating Heat Exchanger 3 Hot Water Storage Tank 4 Water Supply Port 5 Drainage Port 6 Hot Water Supply Port 7 Circulation Pump 22 Hot Water Temperature Detection Unit C Control Unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Kenji Zhang, 2-3-11 Honmachi, Hyogo-ku, Kobe, Hyogo Prefecture Fuji Manufacturing Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A hot water storage tank (3) in which water supplied from a water supply port (4) into a tank is made to flow through a tank bottom side to a drainage port (5), and a hot water supply port (6) is provided at an upper part of the tank. ), A water heating heat exchanger (2) heated by a heating means (1), and water from the drain port (5) flowing through the water heating heat exchanger (2). The circulation pump (7) returning to the hot water storage tank (3), the hot water temperature detecting means (22) for detecting the hot water temperature at the bottom of the hot water storage tank (3), and the information of the hot water temperature detecting means (22). A hot water supply device provided with a control means (C) for controlling the operation of the heating means (1) and the circulation pump (7) so as to maintain the hot water temperature above a set value based on the hot water storage tank (3) A hot water supply device arranged above the heat exchanger (2) for heating water.