JPH0212533Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of application) This invention is a bathtub with a water heater, in particular, a water heater that drops hot water at a certain level into the bathtub (hereinafter referred to as hot water), and then heats it up. The present invention relates to a type of bathtub with water heater in which the series of operations described above proceeds automatically.

(Prior art and its problems) This type of bathtub with a water heater has already been applied since 1973.
−43000 is proposed.

This has a configuration shown in FIG. 3, and includes a circulation heating device consisting of a combination of a bath heat exchanger 1 and a bath burner 10, and a combination of a hot water supply heat exchanger 2 and a hot water supply burner 20 inside the vessel. The bathtub 4 and the bath heat exchanger 1 are connected by a circulation heating circuit 11, and two water pipes 41 and 42 are disposed at the connection to the bathtub 4. . For forced circulation, the water pipe 4 below the circulation heating circuit
A circulation pump 13 is inserted near the hot water supply heat exchanger 2, and one of the hot water outlet circuits 21 from the hot water supply heat exchanger 2 is similarly connected to the lower water pipe 42.

In addition, in the bathtub with water heater shown in the same figure, the bathtub 4
A control device is incorporated to automatically proceed with hot water supply and reheating, and the hot water supply temperature and reheating temperature can be adjusted to predetermined temperatures.

For this purpose, a water level sensor 22 for detecting the start timing of the pump 13, a first temperature sensor 12 provided on the inlet side of the pump 13 for detecting the circulating heating temperature, and a first temperature sensor 12 installed in the gas circuit for the bath burner 10 are installed. A first main valve 14 controls this burner, and a second main valve 14 detects the temperature of the hot water at the outlet of the hot water supply heat exchanger 2.
A temperature sensor 23, a proportional valve 24 that operates according to a signal from the second temperature sensor, and a second main valve 2 that opens and closes a gas circuit to the hot water supply burner 20.
5, and a controller main body 3 that converts signal inputs from the sensors into output signals for operating actuators such as pumps and proportional valves.

Therefore, in this conventional device, when the automatic bath heating state is set, the hot water supply burner 10 burns and hot water is supplied from the hot water outlet circuit 21 into the bathtub 4. In other words, hot water from the water heater is poured into the bathtub, resulting in a so-called hot water condition.

When the amount of hot water stored in the bathtub 4 reaches a predetermined water level, the water level sensor 22 detects this, and the second main valve 2 is activated by the output from the controller main body 3 in response to this signal input.
5 is closed to stop combustion of the hot water supply burner 20, and at the same time, the pump 13 and the bath burner 1 are closed.
0 is in the operating state, and the inside of the bathtub 4 is heated cyclically.

When the heating temperature in the bathtub 4 reaches the set temperature, the first
The temperature sensor 12 detects this, and the first main valve 14 inserted into the bath main gas circuit is closed by the output from the controller body 3 in response to this signal input, and the combustion of the bath burner 10 is stopped. Stop.

In addition, in the above-mentioned conventional system, the hot water outlet circuit is arranged so that the hot water supply circuit 27 is piped in addition to the above circuit.
A cutoff valve 26 is inserted downstream of the branching portion, and a check valve 28 for air venting is further inserted downstream of this cutoff valve.

Therefore, in this conventional device, even when hot water is supplied from the hot water supply circuit 27, the above-described cyclic heating is possible. This is because the above-mentioned cutoff valve 27 operates to cut off the water at the same time as the circulating heating starts based on the output of the water level sensor 22.

In this way, with the above conventional system, no matter what state the hot water supply circuit is in, the operation from filling the bathtub with hot water to circulating heating (heating) to raise the temperature in the bathtub to the set temperature automatically progresses. I will do it.

However, in the above-mentioned conventional system, when the circulating heating operation is started based on the output of the water level sensor at the time when hot water is completed, air remains on the suction side of the circulating heating circuit 11, especially on the suction side of the pump 13, and this pump Predetermined suction/discharge operations may not be performed.

This is the lower water pipe 4 that becomes the communication pipe with the bathtub 4.
This is because air remains in this part because 2 is a complicated flow path, and the pump sucks this remaining air when circulating heating starts.

(Technical Issues) The present invention makes it possible to supply hot water to the hot water tank and other hot water supply circuits, detects the completion of hot water filling into the bathtub with a water level sensor, and uses the output of this water level sensor to The hot water outlet circuit 21 of the hot water outlet circuit 21 is shut off and the forced circulation heating in the bathtub proceeds, and furthermore, in the hot water outlet circuit 21, an air venting means is provided, and when the forced circulation heating starts, the residual air is removed from the circulation pump 13. In order to prevent air from being sucked in, the objective is to allow air to escape to a predetermined area during pump operation.

(Means) The technical means of the present invention for solving the above problem is to input the output from the water level sensor 22 as it is to the hot water outlet circuit cutoff means, and to delay the output from the water level sensor 22 to the pump 13. This is because the input was made through the computer.

(Operation) The above technical means of the present invention operates as follows.

When the bathtub is completely flushed, the water level sensor 2
The output from the water level sensor 22 is generated and the circulation heating process begins. At this time, the output from the water level sensor 22 is directly input to the cutoff means such as the cutoff valve 26 inserted into the hot water outlet circuit 21, and the inlet side of this circuit is The circuit is closed, and at the same time, the check valve inserted into this circuit is in the air release state. On the other hand, since the input to the pump 13 is inputted via the delay means, the pump 13 is not in operation at this point.

Therefore, during this time, that is, until the pump 13 starts operating, the air remaining on the inlet side of the pump 13 is discharged from the air vent check valve 28 located at the upper end of the hot water outlet circuit 21, or Alternatively, the hot water exits to the upstream side of the hot water outlet circuit 21.

Thereafter, when the time set by the delay means has elapsed, the input from the water level sensor 22 enters the pump 13, and this pump becomes operational.

Therefore, the pump operates in a state in which the residual air in the suction side circuit has escaped.

(Effects) Since the present invention has the above configuration, it has the following unique effects.

Since there is no residual air on the suction side when the pump is in operation, malfunctions caused by air being suctioned into the pump, that is, inconveniences in which the pump does not perform predetermined suction and discharge operations, can be eliminated.

In addition, there is no need to specially devise a circuit configuration on the suction side of the pump.

(Example) Hereinafter, an example of the present invention will be described based on FIG. 2.

In this embodiment, a water level switch 22a that is closed when the water level reaches a set level is used as the water level sensor 22. connected to a parallel circuit.

In addition, as a delay circuit, a combination of a capacitor 5 and a switching transistor 6 is adopted, and this switching transistor
3, and the voltage across the capacitor 5, which is connected in parallel to the series circuit of the pump 13 and the switching transistor 6, is applied to the switching transistor 6, and when the water level switch 22a is closed. This turns on the circuit of capacitor 5.

In this example, the bathtub 4
When the water level inside reaches a certain level, the water level switch 22
a is turned ON, and the cutoff valve 26 is closed.

On the other hand, since the switching transistor 6 is inserted into the circuit of the pump 13, this circuit is in a non-conducting state. This is because under this initial condition, the voltage across the capacitor 5 is low and the switching transistor 6 is not turned on.

When the amount of charge in the capacitor 5 reaches a predetermined value, the voltage applied to the switching transistor 6 reaches a predetermined value, and this transistor is turned on.

Therefore, after the shutoff valve 26 is closed, the pump 1
There is a certain time difference between the operations of 3 and the desired purpose can be achieved.

It goes without saying that known means can also be used as the delay means.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of the present invention, Fig. 2 is an explanatory diagram of an embodiment thereof, and Fig. 3 is an explanatory diagram of a conventional example. 21...Hot water outlet circuit, 22...Water level sensor, 26...Shutoff valve, 5...Condenser, 6...
...switching transistor.

Claims (1)

[Scope of utility model registration request] Enables hot water to be filled and other hot water supply circuits, and a water level sensor detects when hot water has been filled to the bathtub.
The output of this water level sensor shuts off the hot water outlet circuit 21 for hot water flushing and advances forced circulation heating in the bathtub.
A water heater that is provided with an air venting means, in which the output from the water level sensor 22 is directly input to the hot water outlet circuit cutoff means, and the output from the water level sensor 22 is input to the pump 13 via a delay means. Attached bath pot.