JPH0728489Y2 - Water heater - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Use) The present invention relates to a hot water supply device in which a hot water supply passage is branched into a bath hot water supply passage connected to a bathtub and a general hot water supply passage connected to a general hot water tap. is there.

(Prior Art) Conventionally, a hot water supply passage is branched into a bath hot water supply passage and a general hot water supply passage, and hot water can be poured into the bathtub from the bath hot water supply passage to raise the bath water temperature. Water heaters are known. In this type of hot water supply device, the bath hot water supply passage communicates with the bath water (miscellaneous water), so a vacuum breaker (vacuum breaking valve) is provided on the way to prevent mixing of miscellaneous water into the water supply. A bath water amount sensor is provided in the bath hot water supply path to detect the total amount of hot water supplied to the bathtub, and automatically stop filling the hot water in the bathtub or quantitatively stop hot water. Then, a water input sensor is provided in the water supply path to the heat exchanger to be used for feedforward control of the hot water outlet temperature, and when the general hot water tap is opened during use of the bath hot water supply path, the flow rate detected by the water input sensor is detected. It was made possible to detect this by the flow rate difference between the flow rate detected by the bath water amount sensor and the flow rate detected by the bath water amount sensor.

(Problems to be solved by the invention) In the conventional hot water supply device of this type, when the simultaneous use of the general hot water supply passage is detected while the bath hot water supply passage is being used, the one that allows the simultaneous use and the bath hot water supply passage is cut off. There are some that prioritize the use of the general hot water supply passage, or if the set temperature on the bath hot water supply side is higher than the set temperature on the general hot water supply side,
For example, when general hot water is used simultaneously in hot water, the desired hot water temperature on the general hot water supply side can be obtained by mixing cold water with the hot water to be supplied. In this case, it may be possible to use the hot water with priority so that the general hot water is given priority.

Therefore, in the case of giving priority to general hot water supply, the shut-off valve provided in the bath hot water supply passage is closed to shut off the bath hot water supply passage, but immediately after the shut-off, due to the flow inertia of water, a momentary negative pressure is given to the downstream side of the shut-off valve. A pressure space is created. Therefore, air is sucked from the vacuum breaker and the negative pressure is released, but air is trapped on the downstream side of the shutoff valve in the bath hot water supply passage.

Then, when the general hot water supply is completed and the suspended hot water supply passage is restarted, the detected flow rate of the bath water volume sensor becomes an unstable low flow rate due to this air accumulation, and the bath water volume sensor and the bath water volume sensor There is a difference in the detected flow rate, and it is erroneously determined that general hot water is used simultaneously, and the shutoff valve is closed. However, since the general hot water supply is not used, when the shutoff valve is closed, the flow rate detected by the water input sensor becomes zero, and it is determined that the general hot water supply has ended and the shutoff valve is opened again. Thus, there is a problem that the shutoff valve repeatedly opens and closes in the early stage of reuse of the bath hot water supply passage.

An object of the present invention is to solve the above-mentioned conventional problems and to provide a hot water supply device in which the shutoff valve of the bath hot water supply path does not repeatedly open and close when the bath hot water supply path is reused after being suspended.

(Means for Solving the Problems) In order to achieve the above object, the hot water supply device of the present invention has the following configuration. That is, the hot water supply passage from the heat exchanger is divided into a bath hot water supply passage connected to the bathtub and a general hot water supply passage connected to a general hot water tap, and the water supply amount sensor and the bath hot water supply passage are connected to the water supply passage to the heat exchanger. A shutoff valve, a bath water amount sensor, and a vacuum breaker are installed in the system to detect the simultaneous use of the bath hot water supply channel and the general hot water supply channel based on the flow rates detected by the water input sensor and the bath water flow sensor. An orifice is provided on the upstream side of the water amount sensor.

(Function) When the shut-off valve is closed, the orifice acts as a resistance to reduce the negative pressure space due to the flow inertia of the water, the amount of air pool becomes small, and when the water passes through the orifice when the bath hot water supply channel is reused. In addition, the flow velocity is increased and the air purging effect is increased, so that the air in the vicinity of the bath water amount sensor can be quickly pushed to the downstream side and discharged into the bath. Further, since the flow velocity is increased by the orifice, the one-rotation flow rate characteristic of the bath water amount sensor shifts to the high rotation side and the rotation number becomes relatively high, and the detected flow rate becomes relatively stable even in the initial air-mixed state. Therefore, a difference with the flow rate detected by the water amount sensor is unlikely to occur.

Therefore, when the bath hot water supply passage is reused, it is prevented that the common hot water supply passage is erroneously determined to be used at the same time and the shutoff valve chatters.

(Embodiment) FIG. 1 is a water channel configuration diagram showing an embodiment of the present invention, in which a general hot water supply passage 3 and a bath hot water supply passage 4 are branched from a downstream of a hot water outlet temperature sensor 2 provided at an outlet of a heat exchanger 1. , And is connected to the general hot water tap 5 and the bathtub 6, respectively.

In the water supply path 7 on the upstream side of the heat exchanger 1, there are provided a water quantity sensor 8 and a water temperature sensor 9 for detecting the quantity of water entering the heat exchanger 1,
A bypass water amount sensor 11 and a flow control valve 12 driven by a motor are provided on a bypass passage 10 branched from the upstream side. General hot water supply passage 3 upstream of the connection with the bypass passage 10
A flow rate control valve 13 and a check valve 14 are provided on the above, and a mixed hot water temperature sensor 15 is provided on the downstream side of the above connecting portion.

In the bath hot water supply passage 4, a shutoff valve (solenoid valve) 16, in order from the upstream side,
Orifice 17, bath water sensor 18, vacuum breaker
19, a flow control valve 20 is provided.

Reference numeral 21 is a controller equipped with a microcomputer for controlling various functions of the hot water supply device, which receives signals from the water input amount sensor 8, the bypass water amount sensor 11, the bath water amount sensor 18, etc. to supply the general hot water supply passage 3 and the bath water supply passage 4 respectively. The state of use is determined and the shutoff valve 16 and the like are controlled.

When a high temperature hot water is commanded by a remote controller (not shown), the shut-off valve 16 is opened, the combustion amount of a combustion device (not shown) is adjusted, and the hot water temperature detected by the hot water temperature sensor 2 is a predetermined high temperature such as 80 ° C. The flow rate of the high-temperature hot water is detected by the bath water amount sensor 18, and is controlled by the flow rate control valve 20 to be a predetermined flow rate (for example, 5 l / min).

When the general hot water tap 5 is opened during this high-temperature hot water, hot water also flows from the heat exchanger 1 to the general hot water supply passage 3, and the water amount sensor 8
A flow rate difference occurs between the detected flow rate Q _{1 of 1} and the detected flow rate Q ₃ of the bath water amount sensor 18. This flow differential Q ₁ -Q ₃ is determined that simultaneous use of the general hot water exceeds a certain value, in this case allows the simultaneous use, controlled based on the flow control valve 12 to detect water temperature of the mixed hot water temperature sensor 15 However, the hot water of the set temperature can be supplied from the general hot water supply passage 3.

The simultaneous use may be determined by considering the detected flow rate Q ₂ of the bypass water amount sensor 11 and determining that the simultaneous use is performed when Q ₁ −Q ₃ + Q ₂ exceeds a certain value.

If you want to lower the bath water temperature, use the remote control to command water supply. When water is supplied, the burner is not burned, and the water from the water supply passage 7 is supplied to the bathtub 6 through the heat exchanger 1 and the bath hot water supply passage 4. When the flow rate difference Q ₁ -Q ₃ between the water flow rate sensor 8 and the bath water rate sensor 18 exceeds a certain value in this water supply and the opening of the general hot water tap 5 is detected, simultaneous use is not allowed, and Hot water supply has priority.

At this time, the shutoff valve 16 is closed, and a negative pressure space is created on the downstream side of the shutoff valve 16 due to the flow inertia of the water, and the negative pressure acts on the vacuum breaker 19 to suck air from the vacuum breaker 19 and form an air pool. Although generated, the negative pressure space becomes relatively small because the orifice 17 becomes a resistance, and the amount of air sucked in becomes small.

Then, when the general hot water supply is finished and the shutoff valve 16 is opened again, at the beginning, since the water flowing from the shutoff valve 16 to the bath water amount sensor 18 contains air, the bath water amount sensor 18
The rotation of the impeller of the bath water sensor 18 may become unstable, but the flow velocity increases at the orifice 17 on the upstream side of the bath water amount sensor 18, which increases the rotation speed of the impeller of the bath water amount sensor 18, Rotational inertia is increased and it is less likely to be affected by air mixing. Therefore, the stability of the flow rate detected by the bath water amount sensor 18 is improved.

Further, since the flow velocity at the orifice 17 is increased, the air purge effect is increased, and the air can be quickly pushed out to the downstream side and discharged into the bath 6.

Therefore, when the bath hot water supply passage 4 is reused, the flow rate detected by the bath water amount sensor 18 does not become a low flow rate, and it is not mistakenly determined that the general hot water supply is simultaneously used, and the air accumulation is eliminated in a short time.

(Effects of the Invention) The hot water supply device of the present invention has the following excellent effects. That is, when the bath hot water supply passage is reused after being interrupted, it is not possible to make a misjudgment as simultaneous use of general hot water due to an air pool that has occurred on the downstream side of the shutoff valve. Can be prevented from being repeated.

[Brief description of drawings]

 FIG. 1 is a water channel configuration diagram showing an embodiment of the present invention. 1 …… Heat exchanger 3 …… General hot water supply path 4 …… Bath hot water supply path 5 …… General hot water tap 6 …… Bathtub 7 …… Water supply path 8 …… Water input sensor 16 …… Shutoff valve 17 …… Orifice 18… … Bath water sensor 19 …… Vacuum breaker

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Yoshida 32 Akashi-cho, Chuo-ku, Kobe-shi, Hyogo Shigeru Kumagai, Inspector of Noritsu Co., Ltd. (56) References

Claims (1)

[Scope of utility model registration request] 1. A hot water supply passage from a heat exchanger is branched into a bath hot water supply passage connected to a bathtub and a general hot water supply passage connected to a general hot water tap, and a water supply amount sensor is provided in a water supply passage to the heat exchanger. A shutoff valve, a bath water amount sensor, and a vacuum breaker are installed in the bath hot water supply passage. A hot water supply apparatus which is closed and has an orifice provided between a bath water amount sensor and a shutoff valve in a bath hot water supply passage.