JPH0440125Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is a high-place installation type that reheats the water by forcibly circulating the hot water in the bathtub to a heat exchanger placed in a high place such as in the ceiling. Regarding the bath reheating device.

<Prior Art> A conventional bath reheating device installed at a high place has a configuration shown in FIG. 3. That is, a reheating device 10 consisting of a heat exchanger 1, a burner 2, a forced circulation pump 3, a water flow switch 4, and a control mechanism (not shown) is arranged in the ceiling, and is connected to the bathtub 5 by an outgoing pipe 6 and a return pipe 7. A forced circulation path is constructed by connecting the two. When the reheating switch is turned on, the forced circulation pump 3 starts, and when the water flow switch 4 detects water flow, the burner 2 starts combustion. Hot water in the bathtub 5 enters the heat exchanger 1 through a return pipe 7, is heated there, and is then sent to the bathtub 5 through an outgoing pipe 6.

<Problems to be solved by the invention> In the conventional device mentioned above, a water flow switch is used to prevent dry firing, but when this water flow switch is used, the water flow switch case as an accessory, the water flow switch case for the switch, etc. A magnet, a flapper, etc. are required, and a detection mechanism in the control section is also required, so providing a water flow switch increases the number of parts and increases the cost. There were also problems with poor connections and false detections in the water switch's electrical system. In addition, since the water in the heat exchanger 1, outgoing pipe 6, and return pipe 7 tends to be discharged to the bathtub side when not in use, there are also problems such as the need for preliminary circulation of hot water before burning the burner when reheating. It was hot.

<Purpose> Therefore, the present invention eliminates the drawbacks of the above-mentioned conventional technology,
Dry heating can be prevented without installing a water flow switch,
Furthermore, the object is to provide a high-place reheating device for bathtubs that can reduce the number of parts and reduce costs.

<Means for solving the problem> The present invention is a high-place installation type that reheats the water by forcibly circulating the hot water in the bathtub to a heat exchanger placed in a high place such as in the ceiling using a forced circulation pump. This is a bath reheating device, which is installed in the middle of the hot water pipe from the heat exchanger installed at a high place to the bathtub, only when the water pressure increases in the downward direction caused by the operation of the forced circulation pump. The system is characterized by the provision of a pressure-operated valve that closes the pipeline when the water pressure drops in the downward direction due to the forced circulation pump stopping operation.

<Function> In the middle of the pipe of hot water descending from the heat exchanger installed at a high place to the bathtub, the pipe is opened only when the water pressure increases in the downward direction caused by the operation of the forced circulation pump, and forced circulation is started. We have installed a pressure-operated valve that closes the pipeline when the water pressure decreases in the downward direction when the pump stops operating, so even when the forced circulation pump is stopped, water in the forced circulation route will not flow through the pressure-operated valve. It does not leak downward to the bathtub side. In other words, when the forced circulation pump is stopped, the pressure-operated valve closes the pipe halfway, so even if the water in the bathtub decreases, the air in the forced circulation path will not be replaced. Therefore, water remaining in the forced circulation path is also not drained.

In this invention, by providing a pressure-operated valve in this way, it is possible to leave water in the heat exchanger part as well as in the forced circulation path without trapping air. There is no need to check with a water flow switch. In other words, dry heating is prevented without the need for a water flow switch. Therefore, the number of parts can be reduced and the electrical system can be omitted.
In addition, preliminary circulation to the forced circulation path prior to reheating becomes unnecessary.

<Example> FIG. 1 is a configuration diagram of an apparatus for implementing the present invention, and FIG. 2 is a sectional view showing details of a pressure-operated valve.

A reheating device 10 is arranged in the ceiling of the bathtub 5. The reheating device 10 includes a heat exchanger 1, a burner 2,
A forced circulation pump 3 is provided. The bathtub 5
and the reheating device 10 are connected by an outgoing pipe 6 and a return pipe 7, forming a forced circulation path. These points are similar to the conventional device shown in FIG. In this device, a pressure-operated valve 80 is provided in the outgoing pipe 6 within the reheating device 10. On the other hand, a water flow switch is not provided.

The pressure-operated valve 80 opens the pipeline when pump pressure due to the start of operation of the forced circulation pump 3 is applied to the pressure-operated valve 80, and closes the pipeline when the pump pressure is released by stopping the operation of the forced circulation pump 3. It is composed of As shown in FIG.
0, a valve seat 82, a valve body 83, a valve spring 84, and a spring receiver 85 are provided in a cylindrical main body 81, and the valve body 83 is moved against the valve spring 84 by the pump pressure of the forced circulation pump 3 applied in the direction of the arrow. is pushed down against the pressure, opening the conduit.

Now, when the reheating switch is turned on and the forced circulation pump 3 starts, the pressure-operated valve 8 is
0 is opened, and hot water heated by the burner 2 is sent to the bathtub 5 through the outgoing pipe 6. The water in the bathtub 5 is returned to the return pipe 7.
is sent to the heat exchanger 1 through the Next, when the reheating switch is turned off, the forced circulation pump 3 is stopped and the burner 2 is extinguished. At this time, the pressure-operated valve 80 no longer receives the discharge pressure from the pump 3, so the restoring force of the valve spring 84 causes the valve body 83 to close the pipeline. When the pressure-operated valve 80 is closed, even if the water in the bathtub 5 is drained, air from outside cannot be replaced in the forced circulation path, so water remains in the forced circulation path. remain. Therefore, the inside of the heat exchanger 1 is naturally filled with water, and an empty firing state due to air trapping cannot occur during the next reheating.

<Effects> The present invention has the above-mentioned configuration, and the water pressure increases in the downward direction caused by the operation of the forced circulation pump in the middle of the hot water pipe that descends from the heat exchanger installed at a high place to the bathtub. We installed a pressure-operated valve that opens the pipe only when the forced circulation pump stops operating and closes the pipe when the water pressure decreases in the downward direction due to the forced circulation pump stopping operation. It is possible to keep the water filled at all times regardless of whether the vehicle is in operation or not. Therefore, dry firing of the burner can be reliably prevented without using a conventional water flow switch. Since a water flow switch is not used, there is no need to use multiple parts associated with the use of a water flow switch, and costs can be reduced by reducing the number of parts. Moreover, since the electrical system associated with the use of a water flow switch is not used, the problem of false detection due to poor contact etc. is also eliminated. Furthermore, with this invention, the pipe is always kept full of water, so there is no need for preliminary circulation using a forced circulation pump prior to starting reheating, and the time from turning on the reheating switch to igniting the burner is unnecessary. This has the effect of shortening the time.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus for implementing the present invention, FIG. 2 is a sectional view showing details of a pressure-operated valve, and FIG. 3 is a block diagram of a conventional apparatus. 1... Heat exchanger, 2... Burner, 3... Forced circulation pump, 5... Bathtub, 6... Outgoing pipe, 7... Return pipe, 10... Reheating device.

Claims (1)

[Scope of utility model registration request] A bath reheating device installed at a high place that performs reheating by forcibly circulating the hot water in the bathtub to a heat exchanger placed at a high place such as in the ceiling using a forced circulation pump, In the middle of the pipe for hot water going down from the heat exchanger to the bathtub, the pipe is opened only when the water pressure increases in the downward direction caused by the operation of the forced circulation pump, and the line is opened in the downward direction when the forced circulation pump stops operating. A high-place reheating device for a bath, characterized by being equipped with a pressure-operated valve that closes a pipe when the water pressure is low.