JPS6157974B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to controlling the water temperature in a bathtub in a bath unit having a heat source device that forcibly circulates water in the bathtub using a pump and heats the water within the circulation circuit. , provides a temperature control device that minimizes heat dissipation after the water temperature reaches a set value.

Various bathtubs have been devised that use pumps to forcefully circulate and heat the water in the bathtub, and many have also been proposed that have means for controlling the water temperature in the bathtub to a set value. However, the temperature is controlled while keeping the amount of circulating water constant. For this reason, even after the water temperature in the bathtub reaches the set value, a large amount of flow is circulated, so heat dissipation in the bathtub or in the piping is greater than in a case where circulation is not performed. <Because the temperature of the water in the bathtub dropped drastically> there was frequent heating and wasted energy. The present invention solves the above drawbacks by controlling the amount of circulating water as well as the water temperature.

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the heat source device has the following configuration. At the end of the circulating water inlet pipe 1, there is a temperature detector 2,
Branch pipe 3, control valve 4, water valve 5, heat exchanger 6,
The merging pipes 7 are connected in the order shown to form a main flow path. Furthermore, a bypass pipe 9 having a constant flow valve 8 is connected to the merging pipe 7 in the middle of the branch pipe 3 to form a bypass circuit. The temperature detector 2 has a function of detecting the temperature of the water passing through it and outputting a signal, and is configured to be integrated with a control valve 4 that opens and closes in response to this signal to initiate a temperature control operation. The water valve 5 has a function of detecting the presence or absence of water passing through the interior and outputting a signal. The heat exchanger 6 is arranged so that water passing through the heat exchanger 6 is heated by a burner 10, and the fuel supply to the burner 10 is controlled by a fuel control valve 11. The fuel control valve 11 opens and closes in response to a signal from the water valve 5. When there is a water flow in the water valve 5, the fuel control valve 11 is opened, and when there is no water flow, the fuel control valve 11 is opened and closed.
It is configured to cause the fuel control valve 11 to close. As shown in FIG. 2, the constant flow valve 8 has an inlet 12 and an outlet 13, and has a valve chamber 14 inside. A valve body 15 is attached to a spring 1 in the valve chamber 14.
6, and is arranged so as to close the inlet 12. In this configuration, the inlet 1
When the pressure difference between the valve chamber 2 and the outlet 13 increases and reaches a certain value, the valve element 15 opens the inlet 12 and allows water to pass through the valve chamber 14 to the outlet 13. When the differential pressure further increases, the edge 16 of the valve body 15 acts in the direction of closing the outflow port 14, so that the flow rate passing through the constant flow valve 8 is controlled to be almost constant regardless of the magnitude of the differential pressure. There is.

The above is the configuration of the heat source device.

The operation will be described below.

One end of the suction pipe 18 opened to the bathtub 17 is connected to the pump 1
9, and the discharge side is directly connected to the inlet pipe 1. Also, the return pipe 20 connected to the merging pipe 7 is connected to the bathtub 1.
7 is opened. When the bathtub 17 is filled with water in this state and the pump 19 is operated, the water in the bathtub 17 is
It is sent to temperature detector 2. Since the temperature of the water is initially low, a signal to open the control valve 4 is sent from the temperature detector 2 to the control valve 4, and the control valve 4 opens. The water leaving the temperature sensor 2 passes through the control valve 4 and causes the water valve 5 to generate a water flow. Then, the fuel control valve 11 opens and the burner 10 burns. Therefore, the water passing through the heat exchanger 6 is heated to a high temperature and is sent into the bathtub 17 through the return pipe 20. As this operation continues, the water in the bathtub 17 is heated and a bath is created. At this time,
There is no water flow in the bypass pipe 9 branched from the branch pipe 3 because the pressure at which the constant flow valve 8 opens is not reached. This is because the pipe resistance on the heat exchanger 6 side is matched as shown in A, as shown in FIG.

In other words, the flow rate is Q ₁ , which is a considerably large amount.
The pressure is H ₁ , which is the opening pressure of constant flow valve 8.
It is set to be smaller than H ₂ . The purpose of flowing a large flow rate during heating is to reduce the temperature difference between the inlet temperature and the outlet temperature of the heat exchanger 6. In other words, if the bathtub is heated with a person inside, if the temperature difference is too large, the return pipe 2
This is because the temperature emitted is higher than zero, which is dangerous. Next, when the water temperature in the bathtub 17 reaches a predetermined temperature, the temperature detector 2 issues a signal to close the control valve 4. Then, the water from the pump 19 has nowhere to go, the pressure increases, and the constant flow valve 8 closes. When the opening pressure H ₂ is reached, the valve body 15 releases the spring 16
The inlet 12 is opened against the pressure, and from the outlet 13,
It enters the confluence pipe 7 and returns to the bathtub 17 via the return pipe 20.
When the control valve 4 closes, water no longer flows through the water valve 5, and as a result, a signal to close the fuel control valve 11 is issued. Then burner 10
will stop burning and stop heating.

Since the constant flow valve 8 shows a resistance curve B as shown in FIG. 3, the flow rate shows only a small value of _Q2 .
The reason is that when the flow rate increases, the valve body 1
5 moves to the right against the spring 16, so the edge 16
This is because the flow gradually closes the outlet 13. This operation ensures a nearly constant flow rate. The reason why the constant flow rate characteristic is provided is that it is unknown what characteristics the pump 19 will have and that the flow rate will not increase even if a pump with high performance is used.

When water passes through the bypass pipe 9, the flow rate is much smaller than that during heating, so the turbulence of the water surface 21 in the bathtub 17 is small, and the flow velocity in the suction pipe 18 and return pipe 20 is also small. For,
The amount of heat exchange is reduced, allowing for less heat dissipation.

Furthermore, even at a small flow rate, the water in the bathtub 17 is flowing to the temperature detector 2, so the water temperature in the bathtub 17 is constantly observed. Therefore, when the water temperature decreases,
The water temperature in the bathtub 17 is kept constant by the temperature sensor 2 acting to open the control valve 4 again.

As described above, according to the present invention, by changing the amount of circulating water between heating and non-heating, it is possible to minimize heat dissipation during non-heating and reduce heat loss due to heat dissipation. , the frequent operation of temperature control can be alleviated, and the durability of the equipment can be improved.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a water circuit of a forced circulation bath unit according to an embodiment of the present invention, Fig. 2 is a sectional view of an embodiment of a constant flow valve used in the present invention, and Fig. 3 is a diagram showing pump characteristics and water circuit. It is a resistance characteristic diagram. 2... Temperature detector, 6... Heat exchanger, 8... Constant flow valve, 17... Bathtub, 19... Pump.

Claims (1)

[Claims] 1 After the water in the bathtub is heated by pumping it to the heat source machine,
A bypass circuit is provided for returning the water to the bathtub again and bypasses the heat exchanger of the heat source device, and when the water temperature in the bathtub is below a set value, the water is sent to the heat exchanger, and when the water temperature is above the set value, the bypass circuit is provided. The temperature of the forced circulation bath unit is configured such that water is supplied to the bypass circuit, and a constant water flow valve is provided in the bypass circuit to maintain the water volume below a predetermined value, and the temperature of the forced circulation bath unit is such that a smaller volume of circulating water is supplied to the bypass circuit than when water is supplied to the heat exchanger. Control device.