JPH04203836A - Hot water feeder - Google Patents

Abstract

PURPOSE:To enable a hot water temperature to be decreased down to a desired hot water temperature by a method wherein when a hot water temperature in a bathtub is higher than a boiling-up temperature set by a setting device, a circulation pump and a blower are driven without igniting a burner. CONSTITUTION:It is judged if an automatic boiling-up mode for keeping a hot water temperature set at a water level in a bathtub 2 is being carried out, if the operating is being carried out, a next operation is run and if not, the processing is stopped. Then, the water level in the bathtub and the set water level are compared to each other, and if the set water level is lower than the water level in the bath tub, a water is fed up to a predetermined water level and if the set water level is higher than the water level in the bathtub, the processing is completed. If the water level in the bathtub is equal to the set water level, the set hot water temperature is compared with the hot water temperature in the bathtub. If the set hot water temperature is equal to the hot water temperature in the bath tub, the automatic boiling-up mode for keeping the hot water temperature set at the set water level is completed. When the hot water temperature in the bath tub is lower than the set hot water temperature, the additional boiling is carried out and the heating is continued until the hot water temperature in the bathtub is increased up to its set hot water temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water heater that supplies hot water to a set water temperature and a set water level.

BACKGROUND OF THE INVENTION In recent years, water heaters have been required to be able to immediately control the water temperature to the set temperature even when the water temperature setting is changed.

Conventionally, this type of water heater drips hot water from the water heater into equipment that uses hot water such as a bathtub (hereinafter referred to as a bathtub), and the amount of hot water in the bathtub that decreases due to the use of hot water is always kept at a constant water level and constant hot water. The water level in the bathtub is compared with the water level detected by a water level sensor, etc., and the set water level set by a setting device, etc., and the water level in the bathtub is kept constant. The water temperature in the bathtub was kept constant by comparing the set water temperature and boiling the water to the set temperature.

Problems to be Solved by the Invention However, with the above configuration, when the desired hot water temperature is set using the setting device, if the temperature setting is changed to a temperature lower than the bath water temperature, the system stops. The problem is that the user has to wait for the water temperature to drop as the bathtub cools, or open the faucet and pour water to bring the water temperature down to the desired temperature, making it very inconvenient to use. was there.

The present invention solves the above-mentioned conventional problem, and is a water heater that has an automatic boiling function that always keeps the water temperature and amount of water constant in the bathtub. To provide a water heater having an automatic boiling function capable of lowering the water temperature to a desired temperature in a short time and without bothering the user even when the temperature is reset.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a burner, a blower that sends combustion air to the burner, and a heat exchanger that receives the heat of the burner and converts water passing through the inside into hot water. a bathtub that uses hot water heat-exchanged by the heat exchanger; a hot water temperature detection unit that detects four temperatures in the bathtub; and a circulation pump that circulates the hot water in the bathtub inside the heat exchanger. a setting device that sets the boiling temperature and water level of the water in the bathtub; a control section that inputs the output of the hot water temperature detection section and the setting input of the setting device and controls the drive of the burner, blower, and circulation pump; If the water temperature in the bathtub becomes higher than the boiling temperature set by the setting device, the control unit starts the blower and the W1 ring pump without igniting the burner, and The problem is solved by circulating the hot water from the bathtub inside the heat exchanger and radiating heat for cooling.

Operation The present invention uses the above-mentioned problem-solving means to solve the problem when the water temperature in the bathtub becomes higher than the boiling temperature set by the setting device.
By driving the circulation pump and blower without combusting the burner, the hot water in the bathtub that passes through the heat exchanger can be cooled rapidly.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. 1 and Section 2.

As shown in the figure, a water temperature detector 1 detects the temperature of water in the bathtub 2, and a setting device 3 sets the amount of water in the bathtub 2, the boiling temperature, and other operations of the water heater. The control unit 4 controls the entire water heater, compares the temperature of the water temperature detection unit 1 with the user's desired boiling temperature set by the setting device 3, and adjusts the temperature of the bathtub obtained from the signal of the water temperature detection unit 1. When the temperature of the hot water is lower than the temperature set by the setting device 3, the blower 5 that sends out combustion air and the circulation pump 7 that circulates the hot water in the bathtub 2 through the heat exchanger 6 are driven.

The heat exchanger 6 receives and exchanges heat from the burner 8, and brings the temperature of water or hot water passing through the inside close to the temperature near the heat exchanger 6. The circulation pump 7 circulates hot water in the bathtub 2 between the heat exchangers 6. The blower 5 sends combustion air during combustion in the burner 8, and sends air to the heat exchanger 816 via the burner 8 after combustion is completed to cool down the heated heat exchanger 6. In addition,
9 is a check valve, and 10 is a two-way valve. In addition, part A is a hot water supply thermal circuit that boils hot water when supplying hot water to the bathtub 2 and other hot water faucets, but since it is not directly related to the present invention, individual details will not be explained. Omitted.

Moreover, the setting device 3 may be a remote control device.

To explain the operation in the above configuration, when the bathtub 2 is filled with hot water at α゛C, the water temperature is set to 8° from the setting device 3.
In the case where the setting is reset to C, in the relationship between α and β (β is higher than α), by driving the circulation pump 7 while the burner 8 is ignited, the hot water in the bathtub 2 flows through the circulation bomb. , 2-way valve 1O8 circulates through the hot water temperature detection unit 1, heat exchanger 6, and bathtub 2, and is heated by passing through the inside of the heat exchanger 6 heated by the combustion heat of the burner 8, and thereafter the hot water temperature is detected. Combustion and circulation will continue until the temperature detected by section 1 reaches the set temperature of setting device 3. In addition, in the relationship α>β, the circulation pump 7 is driven while the burner 8 is extinguished and the blower 5 is driven, and the hot water in the bathtub 2 is 1. The water circulates through the heat exchanger 6 and the bathtub 2, and is cooled by passing through the inside of the heat exchanger 6, which is cooled to near the outside temperature by the air sent by the blower 5, and then detected by the hot water temperature detection unit 1. The circulation continues until the temperature reaches the set temperature of the setting device 3. In Fig. 2, a gas water heater with 2 cans and 2 channels was explained as an example, but even if the water heater has 1 can with 2 channels or 2 cans with 3 channels, the type of water heater depends on the fuel type, such as an oil water heater. Even if the values are different, the same effect can be obtained.

To explain the above operation in more detail from the flowchart shown in Fig. 3, which is part of the control routine of the water heater, in Sl, the automatic boiling mode is executed to maintain the set water temperature at the water level set in the bathtub 2. It is determined whether the process is in progress, and if it is in progress, the process moves to S2, and if it is not in progress, the process ends. In S2, the bathtub water level and the set water level are compared, and if the set water level is lower than the bathtub water level in S9, the SIO
Water is injected to a predetermined water level, and if the set water level is higher than the bathtub water level, the process is terminated. If the bathtub water level and the set water level are equal in S2, the set water temperature and the bathtub water temperature are compared in S3, and if the set water temperature and the bathtub water temperature are equal,
In S7, the automatic boiling mode that maintains the set water level and the set water temperature is ended. If the bathtub water temperature is lower than the set water temperature in S4, a catch-up process is performed in S8 to continue heating until the bathtub water temperature rises to the set water temperature. If the bathtub water temperature is higher than the set water temperature in S4, step S5. In S6, the circulation pump 7 is operated while the blower 5 is being driven to rapidly cool down the temperature of the circulating bath water.

Effects of the Invention As is clear from the above embodiments, according to the present invention, when the water temperature in the bathtub is higher than the set water temperature, the control unit drives the blower and circulation pump to reduce the temperature to near the outside temperature. Because we used a heat exchanger to radiate heat and cool the hot water in the bathtub, we were able to rapidly lower the hot water temperature to the desired temperature.Furthermore, since the hot water circulates within the bathtub, compared to lowering the temperature by pouring water into the bathtub, , you can take a comfortable bath without only one part getting cold.

[Brief explanation of the drawing]

Figure 1 is a professional diagram of a water heater according to an embodiment of the present invention;
The figure is a nostem configuration diagram of the water heater, and FIG. 3 is a flowchart of the water heater. 1... Hot water temperature detection unit, 2... Bathtub (equipment using hot water), 3... Setting device, 4... Control unit, 5
...Blower, 6...Heat exchanger, 7...Circulation pump, 8...Burner. Name of agent: Patent attorney Akira Okaji and 2 other names 1
2-Yukata (M-equipment for bathing monks) 6-Heat Exchange Sacred Treasure No. 21! ! 31st! I

Claims (1)

[Claims] a burner, a blower that sends combustion air to the burner, a heat exchanger that receives the heat of the burner and converts the water passing through it into hot water, and a hot water bath that uses the hot water obtained by exchanging heat with the heat exchanger. equipment used, a hot water temperature detection unit that detects the temperature of hot water in the equipment that uses hot water, a circulation pump that circulates hot water in the equipment that uses hot water inside the heat exchanger, and a boiling temperature of hot water in the equipment that uses hot water. a setting device for setting the temperature and water level; and a control section for inputting the output of the hot water temperature detection section and the setting input of the setting device to control the drive of the burner, the blower, and the circulation pump. When the temperature of hot water in the hot water usage equipment becomes higher than the boiling temperature set by the setting device, the blower and circulation pump are started without igniting the burner, and the temperature inside the heat exchanger is increased. A water heater that circulates hot water from hot water-using equipment and radiates heat to cool it.