JPH04371750A - Hot water feeder - Google Patents

Abstract

PURPOSE:To get a common use of heat absorption fins of a hot water feeding pipe and a bath heat transmitting pipe, to start a combustion under a value calculated in response to a flow rate and a water feeding temperature during a hot water feeding operation and under a value added with a constant value during a concurrent operation with a bath heating operation and further to prevent a variation of hot water temperature even under a concurrent operation of hot water feeding and bath heating. CONSTITUTION:A hot water feeding heat transmitting pipe 5 which is integral with a bath heat transmitting pipe 9 with heat absorption fins 12 is connected with a flow rate sensing device 3, a fed water temperature sensing device 4 and a fed-out hot water temperature sensing device 6 so as to construct a hot water circuit. A bath heat transmitting pipe 9 is connected with a circulation pipe 10, a bath hot water temperature sensing device 7, a circulation pump 8 and a flow rate switch 15 so as to construct a bath circulation circuit. Then, a control device 2 controls a combustion amount of a heating burner 1 to a value added with a specified value to a value calculated by the flow rate sensing device 3 and a fed water temperature sensor 4 during a concurrent operation of a hot water feeding and a bath heating. In the case that the combustion amount exceeds an upper limit of combustion, a bath heating operation is stopped. Accordingly, a concurrent operation of hot water feeding and heating bath at a hot water feeding temperature less than the set temperature can be prevented and a feeling of use can be improved.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-channel water heater that uses oil or gas as a heat source and is mainly used in households.

0002

[Prior Art] As shown in FIG. 2, a conventional one-can, two-channel type water heater includes a heating burner 1 whose combustion amount can be varied, a flow rate detection device 3, an inlet water temperature detection device 4, and the combustion heat of the heating burner. A hot water supply circuit consisting of a hot water supply heat transfer tube 5 that transfers heat, a hot water temperature detector 6, a bath water temperature detection device 7, and a circulation pump 8.
, and the bath heat exchanger tube 9, and the hot water supply heat exchanger tube 5 and the bath heat exchanger tube 9 share heat absorption fins 12 to constitute a heat exchanger 13.

[0003]The combustion amount control is performed by first starting combustion with the combustion amount calculated by the temperature setting value, the flow rate detection device 3, and the inlet water temperature detection device 4, both in the case of hot water supply operation and in the case of simultaneous hot water supply and bath heating operation. , the amount of combustion is corrected and controlled so that the hot water temperature reaches the set value. At this time, even if the hot water supply temperature does not reach the set value even if the combustion amount is increased to the combustible upper limit value, the hot water supply operation and the bath heating operation are performed at the same time.

0004

However, in the above-mentioned conventional configuration, as shown in FIG. 4, when hot water supply and bath heating are operated at the same time, the amount of heat is naturally insufficient at the start of operation, so the amount of combustion is corrected and controlled in the direction of increasing it. Since the operation is corrected and controlled using the result of the difference between the value detected by the outlet hot water temperature detector 6 and the temperature set value as an information source, an operation delay occurs. Further, if the correction is applied suddenly, the correction value becomes too large and the hot water temperature rises above the set value, causing a so-called overshoot, so the correction is added little by little. Therefore, the combustion amount changes slowly, and the temperature of the hot water temporarily decreases during that time. On the other hand, when only the bath heating operation was stopped from the simultaneous operation state, there was a problem in that the temperature of the hot water temporarily rose for the same reason as described above.

[0005] Another problem is that even if the combustible upper limit is reached, if the hot water temperature still does not reach the set value, hot water supply operation and bath heating operation are performed at the same time, so hot water can only be supplied with hot water lower than the set temperature. Ta.

The present invention has been made to solve the above-mentioned problems, and aims to provide a water heater that is easy to use and prevents fluctuations in the temperature of hot water even when hot water supply operation and bath heating operation are performed at the same time. be.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a heating burner whose combustion amount can be varied, a flow rate detection device, an inlet water temperature detection device, and a hot water supply transmission for transferring the combustion heat of the heating burner. A hot water supply circuit composed of a heat pipe and a hot water temperature detection device; a bath circulation circuit composed of a bath water temperature detection device, a flow rate switch, a circulation pump, and a bath heat transfer tube; the hot water supply heat transfer tube and the bath heat transfer tube; constitutes a heat exchanger by sharing heat-absorbing fins, and the combustion amount of the heating burner starts at the value calculated by the flow rate detection device and the inlet water temperature detection device during hot water supply operation, During the simultaneous heating operation, a control device is provided which starts combustion at a value that is further added with a certain value, and stops the bath heating operation when this value exceeds the upper limit of combustion possible.

[0008]

[Function] The present invention provides a water heater which is easy to use and prevents fluctuations in the temperature of hot water even when hot water supply operation and bath heating operation are carried out at the same time.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG. Components that are the same as before are given the same reference numerals.

In FIG. 1, reference numeral 1 denotes a heating burner, and the amount of combustion is controlled by a controller 2. Reference numeral 5 denotes a hot water supply heat transfer pipe, and on the upstream side thereof, a flow rate detection device 3 and an incoming water temperature detection device 4 are provided, and on the downstream side, a hot water outlet temperature detection device 6 is provided, and these constitute a hot water supply circuit. 14 is a hot water tap. 9 is a heat transfer tube for the bath, and a bath water temperature detection device 7, a flow rate switch 15, and a circulation pump 8 are connected via a circulation tube 10.
, are connected to the bathtub 11 to form a bath circulation circuit. The hot water supply heat exchanger tube 5 and the bath heat exchanger tube 9 are connected by heat absorption fins 12, and are integrated into a heat exchanger 13 for one can and two waters.
It consists of

The operation of the above configuration will be explained. This water heater has two functions: a hot water supply operation that supplies hot water from the hot water tap 14, and a bath heating operation that circulates and heats the water in the bathtub 11.

First, the hot water supply operation will be explained. By opening the hot water tap 14, water flows through the hot water circuit due to water pressure. The flow rate F1 is detected by the flow rate detection device 3, and the inlet water temperature Twi is detected by the inlet water temperature detection device 4. Using these values and the hot water supply temperature setting value Ts, the controller 2 calculates the required combustion amount FF1 using the following formula. calculate.

FF1=K(Ts-Twi)F1K:
The heating burner 1 starts combustion at the value of the required combustion amount FF1 calculated using the above calculation formula. As a result, hot water of approximately the same temperature as the hot water supply temperature set value can be supplied from the hot water tap 14, but since an error normally occurs, after the combustion starts, the controller 2 performs feedback control on the combustion amount to match the hot water supply temperature set value. Correct temperature deviation. When the hot water tap 14 is closed, the heating burner stops burning.

Next, the bath heating operation will be explained. By operating the circulation pump 8, water in the bathtub 11 flows through the bath circulation circuit. The flow rate switch 15 detects that there is running water,
If the bath water temperature detection device 7 detects that the bath temperature is lower than the bath temperature set value, the controller 2 controls the heating burner to start combustion at a preset value of combustion amount FF2, and the bath water temperature is lower than the bath temperature setting value.
Heat the water in 1. When the bath temperature set point is reached, the heating burner stops burning.

When hot water supply operation and bath heating operation are operated simultaneously, the above-mentioned operations are performed in a combined manner, and the combustion amount FF is
3 is calculated using the following formula.

FF3=FF1+FF2 That is, the combustion amount of the heating burner is changed to a value FF3 which is the sum of the combustion amount of the value FF2 preset for the bath heating operation to the value FF1 necessary for the hot water supply operation at the moment when the simultaneous operation is started. For example, when running a hot water supply operation, the combustion amount is 15,000kca.
When the bath heating operation is turned on while running at l/h, the combustion amount changes to 25,000 kcal/h at that moment, and then the combustion amount is corrected to match the hot water temperature setting value. When the bath heating operation is turned off, the combustion amount is 15,000.
It returns to kcal/h and then corrects the combustion amount so that it matches the hot water temperature setting value. Furthermore, if the calculated combustion amount of 25,000 kcal/h during hot water supply and bath heating operation at the same time is equal to or higher than the combustible upper limit, bath heating operation is not started.

According to the configuration of this embodiment, as shown in FIG. 3, in the case of simultaneous operation of hot water supply and bath heating, the temperature of the hot water supply temporarily decreases at the start of operation, and conversely, only the bath heating operation is stopped from the simultaneous operation state. It is possible to provide a water heater that is easy to use and has little fluctuation in the temperature of hot water, which prevents a temporary rise in the temperature of hot water when the hot water is heated. It also has the effect of preventing the bath heating operation from starting when the combustible upper limit is exceeded, and from supplying hot water only at a temperature lower than the set temperature.

[0018]

As explained above, the water heater of the present invention includes a heating burner whose combustion amount can be varied, a flow rate detection device, an inlet water temperature detection device, a hot water supply heat transfer pipe for transferring the combustion heat of the heating burner, and a hot water outlet. a bath circulation circuit consisting of a bath water temperature detection device, a flow rate switch, a circulation pump, and a bath heat transfer tube for transferring combustion heat of the heating burner; The heat tube and the bath heat transfer tube share heat absorption fins to form a heat exchanger.

[0019]The combustion amount of the heating burner is the value calculated by the flow rate detection device and the inlet water temperature detection device when the hot water supply and bath heating operation are performed simultaneously, and a constant value is added to the value. It is possible to prevent fluctuations in the hot water temperature, such as a temporary drop in the hot water temperature at the start, or, conversely, a temporary rise in the hot water temperature when only the bath heating operation is stopped from the simultaneous operation state. In addition, we have a control device that stops the bath heating operation when the value of the combustion amount added to a certain value exceeds the upper limit of combustibility, so the hot water supply operation and the bath heating operation can be continued while the hot water temperature is lower than the set temperature. It is possible to prevent them from being performed at the same time. In this way, a water heater that is easy to use can be provided.

[Brief explanation of drawings]

[Fig. 1] System diagram of a water heater in one embodiment of the present invention

[Figure 2] System diagram of a conventional water heater

[Fig. 3] Hot water supply characteristic diagram in one embodiment of the present invention

[Figure 4]
Hot water supply characteristic diagram of conventional water heater

[Explanation of symbols]

1 Heating burner 2 Controller 3 Flow rate detection device 4 Inlet water temperature detection device 5 Heat exchanger tube for hot water supply 6　Temperature detection device for hot water 7 Bath temperature detection device 8 Circulation pump 9 Heat exchanger tube for bath 12 Endothermic fins 13 Heat exchanger

Claims (1)

[Claims] 1. A hot water supply circuit comprising a heating burner whose combustion amount can be varied, a flow rate detection device, an inlet water temperature detection device, a hot water supply heat transfer tube for transferring combustion heat of the heating burner, and an outlet water temperature detection device; A bath circulation circuit composed of a bath water temperature detection device, a flow rate switch, a circulation pump, and a bath heat transfer tube, and the hot water supply heat transfer tube and the bath heat transfer tube share heat absorption fins to form a heat exchanger. The combustion amount of the heating burner is determined by starting combustion at the value calculated by the flow rate detection device and the incoming water temperature detection device during hot water supply operation, and by adding a certain value when hot water supply and bath heating operation are performed simultaneously. A water heater characterized by being provided with a control device that starts combustion and stops bath heating operation when the combustion value exceeds an upper limit value for combustion.