JPH0731089Y2 - Pump control device in circulating reheating bath device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a circulation-fired home bath device.

[Conventional technology]

There are various types of circulation-heating bath devices, but the simplest configuration will be described with reference to FIG.

In FIG. 2, reference numeral 1 denotes an appliance, which is installed apart from the appliance 1 and the bathtub 2. The device 1 is provided with a heat exchanger 3 for reheating, the heat exchanger 3 and the bath 2 are connected by a forward pipe 4 and a return pipe 5, and a pump 6 and a bath in the middle of the return pipe 5. And a thermist 8 for detecting the hot water temperature.

This type of bath device is automatically controlled by a microcomputer control unit (not shown). For example, when a boiling temperature is set in a remote controller and a post-heating operation switch is turned on, the pump 6 is driven to drive the bathtub. The water in 2 is circulated between the device 1 and the burner (not shown) is ignited to carry out additional combustion when the flow rate in the circulation pipe reaches a flow rate required for additional operation, thus The water (hot water) in the bathtub 2 is circulated and heated, and when the thermistor 8 detects that the temperature of the hot water reaches a set temperature, the pump 6 is stopped and the combustion of the burner is automatically stopped.

Although the bath device having only the circulation reheating function is shown in FIG. 2, the present invention is not limited to such a bath device, and the bathtub is automatically filled with water. , It is also applied to a bath device that performs circulation reheating if necessary.

[Problems to be solved by the device]

In the bath apparatus as described above, the distance 1 between the bathtub 2 and the appliance 1 is determined by the capacity of the pump 6 provided in the appliance, but usually corresponds to the length of the commonly used pipe. Low capacity pumps are used.

By the way, when the distance 1 between the bathtub 2 and the appliance 1 is long,
When the above-mentioned general pump is insufficient in capacity, workers are replacing it with a high-performance pump on site, and it is known in advance that a high-performance pump is required. It is customary to install equipment with a high pumping capacity in such cases. In such a case, the flow velocity during circulation heating becomes too fast and the bend, joint, pipe There is a problem that corrosion (erosion) occurs on the downstream side where the diameter changes.
That is, the critical flow velocity at which corrosion occurs depends on the temperature and water quality, as described on page 186 of "Handbook of Corrosion Protection Techniques, published by Nikkan Kogyo Shimbun Co., Ltd."
Although / s is supposed to be easy to see, workers such as those on site cannot determine what the maximum flow rate will be in the case of the pump, so the above-mentioned corrosion may occur.

An object of the present invention is to improve the above-mentioned problems of the prior art, and to provide a circulation reheating type bath device in which there is no risk of corrosion in the pipeline in any case.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention installs a bathtub and a device apart from each other, and installs a pump in the circulation reheating conduit in the device so that the water in the bathtub can be used by the pump. In a bath device controlled by a microcomputer control unit that reheats until it reaches a set temperature by circulating between, a flow rate sensor is provided in the circulation reheating conduit, and,
The microcomputer control unit is provided with a function of calculating the maximum flow velocity in the pipeline from the flow rate detected by the flow rate sensor, and reducing the pump capacity when the obtained flow velocity may cause corrosion in the pipeline. It is characterized by that.

[Action]

According to the present invention, as described above, the flow rate sensor is provided in the circulation reheating pipeline, the maximum flow velocity in the pipeline is calculated from the flow rate detected by the flow rate sensor, and the obtained flow velocity corrodes in the pipeline. If the microcomputer control unit is equipped with a function to reduce the pump capacity when there is a possibility of causing a problem, by inputting a simple arithmetic expression to the microcomputer control unit, the maximum flow velocity in the pipeline can be reliably grasped, Corrosion in the circulation line can be prevented.

〔Example〕

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

In the present invention, the flow rate sensor 7 is provided in the circulation pipe, for example, in the return pipe 5, so that the flow rate of the hot water circulated by the flow rate sensor 7 can be detected during the reheating operation. Then, as shown in FIG. 1, when the additional heating operation switch is turned on, the pump 6 is driven, and when the flow rate sensor 7 detects that the flow rate is suitable for additional combustion, the gas burner (not shown) is turned on. Burning is performed to burn, and the flow rate flowing in the circulation pipeline is monitored by the flow rate sensor 7 during the burning operation.
A calculation is performed from the flow rate to control the capacity of the pump 6 to a maximum flow rate that does not result in an excessive flow rate. That is, since the bath device to which the present invention is applied is automatically controlled by the microcomputer control unit, the control board has the following formula Q = A × v Q: the value detected by the flow rate sensor A: in the pipeline Minimum diameter cross-sectional area v: The flow velocity obtained by the calculation is input, and the maximum flow velocity in the pipeline is calculated from this flow rate using this calculation formula. Compared with 1.5m / s, control the pump capacity to the maximum flow rate that does not cause overflow. Specifically, the pump capacity is controlled by changing the resistance value and lowering the voltage of the pump power supply.

Thus, the pump capacity is constantly controlled during the additional heating operation, and when the thermistor 8 detects that the hot water temperature has reached the set temperature,
The pump 6 is stopped, the burner is extinguished, and the additional heating operation is completed.

[Effect of device]

As described above, according to the present invention, since there is no possibility of corrosion in the pipeline in any case, a high-performance pump is mounted and the piping distance between the equipment and the bathtub is arbitrarily designed. It is possible to provide an installation free type bath device that can be installed.

[Brief description of drawings]

FIG. 1 is a flow chart of the additional heating operation by the device of the present invention, and FIG. 2 is a schematic diagram showing a configuration example of an instrument to which the present invention is applied. 1 ... Appliance, 2 ... Bathtub, 3 ... Heat exchanger for reheating, 4 ...
… Circulation forward pipe, 5 …… same return pipe, 6 …… pump, 7 …… flow sensor, 8 …… thermistor.

Claims (1)

[Scope of utility model registration request] 1. A bathtub and a device are installed apart from each other, and a pump is provided in a circulation and reheating conduit in the device, and water in the bathtub is circulated between the device and the device to a set temperature. In a bath apparatus controlled by a microcomputer control unit that reheats until reaching, a flow rate sensor is arranged in the circulation heating line, and the flow rate detected by the flow rate sensor is applied to the microcomputer control unit. A pump control device in a circulation reheating bath device, which is provided with a function of calculating a maximum flow velocity in the inside of the pipe and reducing the pump capacity when the obtained flow velocity may cause corrosion in the pipe.