JPH0224055Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) This invention relates to a water heater for a bathtub with a direct circulation water heater. (Prior art) In a bathtub with a direct circulation water heater, a hot water hopper is installed to reduce the pressure of the hot water from the water heater to atmospheric pressure, separate it from the tap water, and prevent the hot water from flowing back into the tap water. Since the suction amount of the circulation pump and the amount of water entering cannot be balanced, to prevent overflow, it is necessary to detect a high water level and turn the hot water supply ON and OFF, or to turn the hot water supply ON and OFF using both high water level and low water level signals. However, frequent turning on and off of the hot water supply side is unavoidable, and the hot water temperature becomes unstable. That is, in the conventional technique in which the hot water supply pipe _{2 '} shown in FIG. A high water level detector HL' is installed in the hot water hopper 1' shown in Fig. 2b,
In the case where the hot water pipe 2' is equipped with one on-off valve V ₁ ', when the high water level detector HL' detects "no water", the on-off valve V ₁ ' is turned on, and the high water level detector HL' is turned on. When the presence of water is detected, the on-off valve _V1 ' turns OFF, so the on-off valve
_V1 ' is frequently turned ON and OFF, and a high water level detector HL' and a low water level detector LL' are installed in the hot water supply hopper 1' shown in Fig. 2c, For those equipped with a valve V ₁ ′, the on-off valve V ₁ ′ turns OFF when the high water level detector HL′ detects the presence of water, and opens and closes when the low water level detector LL′ detects the presence of water. Since the valve V ₁ ' is turned on, this is somewhat improved compared to the one shown in FIG. 2b, but the ON/OFF of the on-off valve V ₁ ' is still rapid and has a negative effect on the hot water supply side. (Problems to be Solved by the Invention) Therefore, the present invention solves the above-mentioned problems and provides a hot water supply device for a bathtub with a direct circulation water heater that can constantly supply hot water to the bathtub in a stable manner. (Means for solving the problem) This invention consists of a high water level detector HL and a low water level detector in the hot water hopper 1 of a bath pot with a direct circulation water heater.
LL is provided, the high water level detector HL and low water level detector
A flow rate control on-off valve V1 provided with a LL on the upstream side of the hot water supply pipe 2 to the hot water supply hopper 1, and the flow rate control on-off valve _V1 .
Two flow rate control on-off _valves V _{1 ,} The hot water supply flow rate can be switched between high, low, and closed by turning V ₂ ON and OFF, and the hot water supply to the hopper is controlled by two flow control valves
An on-off valve for flow control that can be adjusted in three stages: small volume, large volume, and closed by turning V _{1 and} V ₂ ON and OFF.
This greatly reduces the number of times the _V2 turns on and off, and the possibility of the hot water supply side turning on and off, allowing for stable hot water supply to the bathtub. (Embodiment) An embodiment of the hot water supply device for a bathtub with a direct circulation water heater according to this invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a hot water hopper, which reduces the pressure of hot water from a water heater (not shown) to atmospheric pressure and separates it from the tap water to prevent the hot water from flowing back into the tap water. HL is a high water level detector provided in the hot water supply hopper 1, which detects the upper limit water level of the hot water stored in the hot water supply hopper 1. LL is a low water level detector provided in the hot water supply hopper 1, which detects the lower limit water level of the hot water stored in the hot water supply hopper 1. The relationship between detection and flow control is the relationship between the high water level detector HL and low water level detector LL installed in the hot water supply hopper 1, the two flow rate control on-off valves V ₁ and V ₂ , and the flow rate to the bathtub. The flow rate is controlled by turning on and off the two flow rate control on-off valves V ₁ and V ₂ as shown in Table 1 based on the water level detection signal from the water level detector HL and low water level detector LL. 2 is a hot water pipe for supplying hot water from the water heater to the hot water hopper 1;
V ₁ is a flow rate control on-off valve provided in the hot water pipe 2;
V ₂ is a flow rate control on-off valve provided downstream of the flow rate control on-off valve V ₁ , and a bypass circuit 3 is provided across the flow rate control on-off valve V ₂ .
When only V ₁ is turned ON (same as when open), hot water from hot water pipe 2 is supplied to hot water hopper 1 via bypass circuit 3, so a small amount of hot water is supplied to hot water hopper 1.
Hot water is supplied to the bathtub, and at this time, if the water level in the hot water supply hopper 1 is between the high water level detector HL and the low water level detector LL, hot water is continuously supplied, and the water temperature is also stabilized. Additionally, if the amount of hot water fed by the pump increases and the water level in the hot water supply hopper 1 falls below the low water level detector LL, both the two flow rate control on-off valves V ₁ and V ₂ will be activated.
Since the hot water is turned on and hot water is supplied to the hot water hopper 1 via both the hot water supply pipe 2 and the bypass circuit 3, a large amount of hot water is supplied to the hot water supply hopper 1 to supply hot water to the bathtub, and the water level in the hot water supply hopper 1 increases. High water level detector HL
When the water is located between the low water level detector LL and the low water level detector LL, hot water is supplied again by the bypass circuit 3, and a stable continuous hot water supply state is restored. In addition, if the water level in the hot water supply hopper 1 exceeds the high water level detector HL due to a decrease in the amount of hot water supplied by the pump, 2
Hot water supply is stopped by turning off both flow rate control on-off valves V ₁ and V ₂ (same as closed). Note that it is preferable to use solenoid valves for the flow rate control on-off valves V ₁ and V ₂ . 4 is an orifice provided in the bypass circuit 3. A high water level detector is constructed by electrically connecting the high water level detector HL and low water level detector LL with the two flow control valves V ₁ and V ₂ .
The water level detection signals from the HL and low water level detector LL are used to turn on and off the two flow rate control on-off valves V ₁ and V ₂ to switch and control the hot water supply flow rate between high, low, and closed during normal use. In this system, hot water is supplied stably in a small amount, and when the amount of hot water supplied by the pump changes particularly, the amount of hot water supplied is increased or closed to correspond to the amount of hot water supplied by the pump. Although this explanation has been made based on changes in the amount of hot water fed by the pump, the same applies to changes in the amount of hot water supplied to the hot water hopper due to fluctuations in water supply pressure, etc. 5 is a switching valve V ₃ of the reheating circuit A, which will be described later, from the hot water supply hopper 1.
This is the hot water supply conduit to the In addition, the reheating circuit A is operated by switching the switching valve V ₃ installed on the upstream side of the circulation pump P. When hot water is supplied to the bathtub, the circulation pump P is switched on.
The hot water from the hot water supply hopper 1 is transferred to the hot water supply conduit 5→
Switching valve V ₃ → Downstream side of the return pipe 6 → Reheating inner shell (heat exchanger) 7 → Outgoing pipe 8 → Guide to the bathtub, and when reheating, circulate pump P to transfer hot water from the bathtub to the bathtub → return pipe 6 → reheating inner shell 7 → outgoing pipe 8 → guided to the bathtub for heating and circulation. 9 is reheating inner shell 7
This is a gas burner that heats and raises the temperature of the hot water that flows through it.

[Table] (Effects of the invention) As explained above, this invention is based on the high water level detector HL and low water level detector LL provided in the hot water hopper 1.
and two flow rate control on-off valves V ₁ and V ₂ provided in the hot water supply pipe 2 to the hot water supply hopper 1 are connected so that the hot water supply can be controlled to be switched to large, small, or closed depending on the amount of hot water fed by the circulation pump. Therefore, the on-off valve for flow rate control V ₁ ,
It is possible to significantly reduce the number of times the V ₂ turns on and off, and also the possibility of the hot water supply side turning on and off, allowing hot water to be supplied to the bathtub at a stable temperature, making it extremely easy to use. .

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of a hot water supply device for a bathtub with a direct circulation water heater according to this invention;
Figures a, b, and c are schematic configuration diagrams of only the main parts of the conventional example. 1... Hot water hopper, HL... High water level detector,
LL...Low water level detector, 2...Hot water pipe, V ₁ , V ₂ ...
...On-off valve for flow control.

Claims (1)

[Scope of utility model registration request] Hot water hopper 1 in a bath pot with direct circulation water heater
A high water level detector HL and a low water level detector LL are provided on the upstream side of the hot water supply pipe 2 to the hot water supply hopper ₁ . Two flow rates are controlled by _{the water level detection signals of the high water level detector HL and the low water level detector LL in conjunction with the flow rate control on/off valve V 2 equipped} with a bypass circuit 3 on the downstream side of the flow rate control on/off valve V 1 . On-off valve for V ₁ ,
A hot water supply device for a bath pot with a direct circulation water heater, which is provided so that the hot water supply flow rate can be switched and controlled between large, small and closed by turning _V2 ON and OFF.