JPH056102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bath kettle, and particularly to a bath kettle equipped with a hot water filling function.

[Prior art and its problems] A bathtub equipped with an automatic hot water filling function that automatically stops the hot water filling operation when the hot water for filling the bathtub reaches a certain level is roughly shown in Figure 5. We have already proposed a bathtub with a similar configuration;
An on-off valve 4 and a water pressure gauge 34 are provided in this order from the upstream side.

In this device, when a hot water filling switch (not shown) is turned on, an on-off valve 4 is opened, and hot water filling water supplied from a water pump (not shown) provided in a hot water supply device 5 flows to the bathtub 2 side to perform hot water filling operation. progresses.

Compared to natural circulation type bathtubs, there is no need to precisely match the installation heights of bathtub 2 and bathtub A with each other, such as forced circulation bathtubs equipped with water pumps and high-temperature hot water bathtubs. In this case, the installation positions of the bathtub 2 and the bathtub A are shifted from each other in the height direction and become irregular for each appliance to be installed. That is, for each appliance installed, the water pressure gauge 34 disposed in the bathtub A and the bathtub 2 are shifted in the height direction, and the difference in height between the two is not constant.

Therefore, even if different installed bathtubs 2 are filled with hot water to the same water level, the output of the water pressure gauge 34 will be different for each bath due to the uneven height difference between the bathtub 2 and the water pressure gauge 34. is not constant. That is, even if the water in the bathtub 2 has reached the water filling completion level, the water pressure gauge 34 does not necessarily issue a filling completion signal.

In order to solve this problem, in the above bath kettle,
The water pressure corresponding to the water head difference between the opening that the hot water filling circuit 17 opens in the side wall of the bathtub 2 (hereinafter referred to as the spout 29) and the water surface when the hot water is completely filled is the height of the installed equipment and the bathtub 2. Focusing on the fact that the water pressure is always constant regardless of the magnitude of the difference, the water pressure corresponding to the water head difference is used to determine the completion state of hot water filling.

That is, in the initial stage of filling when hot water starts to be supplied from the hot water supply device 5, the filling water is supplied to the spout 29 of the hot water filling circuit 17 that is open to the side wall of the bathtub 2, and When the flow path between the spout 29 and the on-off valve 4 is filled with water, the on-off valve 4 is closed to seal the water in the flow path downstream of the on-off valve 4, and after this state is established. The water pressure detected by the water pressure gauge 34 (hereinafter referred to as reference water pressure gauge P0) is stored in a control device provided within the appliance. Then, the reference water pressure gauge P0 will be detected by the water pressure gauge 34 when it is assumed that water filling water is supplied into the bathtub 2 and the water level in the bathtub rises to the spout 29 portion of the hot water filling circuit 17. It is equal to water pressure.

Then, when the on-off valve 4 is opened again to continue the filling operation, and the spout 29 is immersed in the filling water in the bathtub 2, the water pressure detected by the water pressure gauge 34 increases as the filling operation continues. P and the above reference water pressure gauge P
0 (P-P0) (this water pressure difference is always constant regardless of the height difference between the bathtub 2 and the installed bath pot A). to judge.

When the water surface of the hot water reaches the hot water filling completion level, the hot water filling circuit 17 is opened into the bathtub 2.
Water pressure P corresponding to the water head difference between the water outlet 29 and the water surface
- When P0 reaches the preset hot water filling completion value,
Based on the signal from the water pressure gauge 34 that detects this,
Stop instrument operation. This completes the hot water filling operation.

However, the above-mentioned method has a problem in that the water level tends to deviate from the proper position when the water is completely filled, making it difficult to fill the water accurately.

This is because in the above case, it is difficult to accurately detect the reference water pressure P0.

That is, in the above system, as shown in FIG. 5, since the water outlet 29 of the hot water filling circuit 17 that opens into the bathtub 2 is oriented in the horizontal direction, the on-off valve 4 is turned off in order to detect the reference water pressure P0. Close this and spout 29
When the flow path between the two is filled with water, air enters the flow path from the water spout 29 facing in the horizontal direction, and the water in the flow path replaces the intruding air and flows into the bathtub 2. leaks gradually. And the water spout 29
If the horizontal piping section L continuing upstream of is short,
The water filling the horizontal piping portion L leaks into the bathtub 2 relatively quickly, and when the control device built into the appliance reads the water pressure detected by the water pressure gauge 34 to read the reference water pressure P0, the horizontal piping portion L Water has begun to drain from the vertical piping section 51 connected to the water pressure gauge 34 on the upstream side.

Then, a vertical piping section 5 connected to the water pressure gauge 34 is provided.
The water pressure detected by the water pressure gauge 34 after the water starts to drain to 1 is the water pressure at the water outlet 2 at the tip of the hot water filling circuit 17.
The water pressure detected by the water pressure gauge 34 when the water is full up to 9, that is, does not match the appropriate reference water pressure P0. Therefore, the completion state of hot water filling determined using this incorrect reference water pressure P0 naturally also lacks accuracy. From this, even if it is determined that hot water filling is complete and the hot water filling operation is stopped, the actual water level in the bathtub 2 will deviate from the appropriate water level and hot water will not be filled accurately. be.

[Technical Problem] The present invention provides a hot water filling circuit 17 connected to the side wall of the bathtub 2, an on-off valve 4 inserted into the hot water filling circuit 17, and a water pressure gauge 34 downstream thereof. When the filling water that has started flowing into the hot water filling circuit 17 at the beginning of the filling operation fills between the on-off valve 4 and the spout 29 at the downstream end of the hot water filling circuit that opens into the bathtub 2, the on-off valve 4 is closed. After closing the valve, check the water pressure gauge 3.
4 and the water pressure detected by the water pressure gauge 34 at the time of completion of filling the bath water, the bath pot is equipped with an automatic hot water filling function that determines when the filling of hot water is completed and stops the filling operation. ” In
The technical problem is to be able to accurately measure the reference water pressure P0 in order to perform accurate filling without causing the water level to deviate from the appropriate position when filling is completed.

[Means] The technical means of the present invention for solving the above problem is as follows: ``The tip of the hot water filling circuit 17 is made to protrude into the bathtub 2, and the vicinity of the tip of the hot water filling circuit 17 is bent upward. This means that the rising portion 49 was formed.

[Function] According to the above embodiment, the tip of the hot water filling circuit 17 is bent upward in the bathtub 2 to form a rising portion 49.

Therefore, when the on-off valve 4 inserted into the hot water filling circuit 17 is closed and water is filled up to the rising portion 49 at the downstream end, air, which is much lighter than water, flows downward inside the rising portion 49 filled with water. The filled water will not leak into the bathtub 2.

Therefore, the reference water pressure P0 that the water pressure gauge 34 measures for the above-mentioned filled water that will not leak.
will also be accurate.

Thereafter, using the accurately measured reference water pressure P0, the hot water filling operation is performed in the same manner as that shown in FIG. 5 described above.

[effect] The present invention has the following unique effects.

Since the reference water pressure P0 can be measured accurately, the time point at which hot water filling is completed, which is determined using the reference water pressure P0, is also accurate, and the water level in the bathtub 2 when the hot water filling operation is completed will not deviate from the appropriate position. You can fill the water accurately without any problems.

[Example] Next, the above-described example of the present invention will be described in detail with reference to the drawings.

In the embodiment shown in FIG. 1, the present invention is applied to a bathtub equipped with a forced circulation reheating circuit.

The reheating circuit 3 formed to circulate between the bathtub 2 and the bath heat exchanger 30 has a switching valve 37 located upstream of the bath heat exchanger 30.
A circulation pump P is inserted. Also, the switching valve 37
The upper and lower flow passages of both the pump P and the circulation pump P are connected by a communication passage 33, and the communication passage 33 is provided with a water pressure gauge 34 and an on-off valve 4 on the upstream side thereof. In addition, in this embodiment, the switching valve 37 inserted into the reheating circuit 3 from the downstream end of the communication flow path 33
A valve 41 is provided in the flow path leading to.

On the other hand, a hot water filling valve 11 and a backflow prevention device 12 are inserted in this order from the upstream side into a hot water supply circuit 15 formed on the downstream side of the hot water supply heat exchanger 13. is connected to the switching valve 37 inserted into the reheating circuit 3 described above. Then, when the switching valve 37 is switched,
The switching valve 37 → circulation pump P → the flow path connecting to the bathtub 2 and the reheating circuit 3 connecting to the bathtub 2 → switching valve 37 → circulation pump P → bath heat exchanger 30 → bathtub 2 are selectively opened. It is becoming more and more popular.

In this embodiment, the flow path on the downstream side of the circulation pump P when filling hot water is the circulation pump P→the communication flow path 33→the hot water filling circuit 1 which connects with the bathtub 2.
7, and the circulation pump P → the bath heat exchanger 30 → the auxiliary hot water filling circuit 19 that connects to the bathtub 2,
Water that flows during filling, which will be described later, is supplied to the bathtub 2 side through both the hot water filling circuit 17 and the auxiliary hot water filling circuit 19. Further, the flow path 18 that connects the downstream end of the communication circuit 33 constituting the hot water filling circuit 17 to the bathtub 2 is shared by the hot water filling circuit 17 and the reheating circuit 3, The flow path 18 constitutes a part of the reheating circuit 3 during reheating and a part of the hot water filling circuit 17 during a hot water filling operation.

Furthermore, the downstream end of the above-mentioned hot water filling circuit 17 projects into the bathtub 2, and the vicinity of the tip of the projecting part is bent upward to form a rising part 49, and the end of the rising part 49 opening 6 located at
8 is in a state facing upward. The opening 68 corresponds to the water spout 29 described in the technical means section.

The detailed structure of the vicinity of the opening 68 constituting the water spout 29 is as shown in FIG. The piping fitting 59 is connected to the water discharge pipe 48
and an inlet/discharge water pipe 38 which constitutes the upstream end of the reheating circuit 3 during reheating and the downstream end of the hot water filling circuit 17 when reheating, and the rear end outer circumference of the piping fitting 59. Tightening nut 5 screwed into
8 and a flat cylinder 57 to sandwich the side wall of the bathtub 2. When the flat cylinder 57 is attached, the tip of the water suction and discharge pipe 38 projects further forward from a through hole 58 formed in the center of the flat cylinder 57, and this projection An L-shaped pipe 55 is screwed onto the tip,
The vertically rising portion of the L-shaped pipe 55 forms the above-mentioned rising portion 49.
Further, the opening 68 located at the tip of the L-shaped pipe 55 faces upward.

Further, an opening 53 is formed in the lower side wall of the flat cylinder 57 for letting the hot water fill into the bathtub. The outer periphery of the pipe 55 is covered with a cover 52 including a wire mesh 54.

When detecting the reference water pressure P0, which will be described later, the opening 68 constituting the water outlet 29 → the suction water pipe 3
8->The channel connected to the water pressure gauge 34 described above is filled with hot water, and the reference water pressure P0 is measured based on the height difference between the opening 68 and the water pressure gauge 34.

In this device, the instrument operation is controlled by a control device such as a microcomputer, and the instrument control operation will be explained according to the flowchart shown in FIG.

First, a flag F used to determine whether or not this is the first hot water filling operation after installing the appliance is set to "0".

Next, wait for a hot water filling switch (not shown) to be turned on (see reference numeral 90 in the drawing).

When the above hot water filling switch is turned on, flag F
It is determined whether or not is "0", that is, whether or not this is the first hot water filling operation after installing the appliance. If the flag F is "0" and it is determined that this is the first hot water filling operation after the appliance is installed, the flag F is set to "1", the on-off valve 4 is opened, and the valve 41 is opened.
(See drawing numbers 91 and 92).

Next, the subroutine 93 shown on the left side of FIG. 2 is executed, and the switching valve 37 is switched to bring the hot water supply circuit 15 into the hot water filled state (the state indicated by the solid line in FIG. 1) connected to the circulation pump P side. . At the same time, the hot water filling valve 11 is opened and the circulation pump P is operated.

Thereby, hot water supplied from the hot water supply circuit 15 is transferred to the hot water filling circuit 17 connected to the switching valve 37 → circulation pump P → communication channel 33 → bathtub 2 →
Water begins to be supplied to the bathtub 2 side from the circulation pump P through the bath heat exchanger 30 and through both channels of the auxiliary hot water filling circuit 19 connected to the bathtub 2.

When the execution of the subroutine 93 is finished, the first waiting time T1 necessary for filling the flow path from the on-off valve 4 to the bathtub 2 with hot water is elapsed, and then the opening state is reached. Close the on-off valve 4. Therefore, in this state, the flow path from the on-off valve 4 to the opening 68 (functioning as the water spout 29 in this case) located at the downstream end thereof is filled with hot water. Then, after closing the on-off valve 4 so that the pressure of the circulation pump P is not applied to the water pressure gauge 34, the water pressure read from the water pressure gauge 34 is stored in a specific memory in the microcomputer that constitutes the control device. This is stored and used as the reference water pressure P0 (see drawing numbers 94 and 95). Note that this reference water pressure P0 is calculated by assuming that h is the height difference between the opening 68 that functions as the water outlet 29 of the hot water filling circuit 17 and the water pressure gauge 34, Pz is the atmospheric pressure, ρ is the density, and g is the acceleration of gravity. , the reference water pressure P0=Pz−ρgh.
In the above-mentioned state in which the flow path from the on-off valve 4 in the closed state to the water outlet 29 is filled with water, the portion up to the rising portion 49 formed by the L-shaped pipe 55 is filled with water. ing. Therefore, air having an extremely low specific gravity does not enter downward into the water accumulated in the vertically standing upright portion 49, and the water filling the hot water filling circuit 17 does not enter the bathtub 2. Leakage is completely prevented.

Next, the on-off valve 4 is opened again, and two flow paths are used: the hot water filling circuit 17 that connects the on-off valve 4 to the bathtub 2, and the auxiliary hot water filling circuit 19 that connects the bath heat exchanger 30 side to the bathtub 2. to proceed with the filling operation. Then, after waiting for the second waiting time T2 to elapse, the on-off valve 4 is closed and the pressure of the circulation pump P is not applied to the water pressure gauge 34, and in this state, the water pressure detected by the water pressure gauge 34 is to judge. If the water pressure detected by the water pressure gauge 34 does not exceed the preset water pressure at the time of completion of filling, that is, the water pressure corresponding to the water head difference between the spout 29 and the water level at the completion of filling is set to the reference water pressure described above. If the water pressure detected by the water pressure gauge 34 is lower than the sum of P0 (has not reached the filling completion level), by opening the on-off valve 4 again, the water filling operation using the two channels can be performed. Let it proceed. On the other hand, when the water pressure detected by the water pressure gauge 34 reaches the above value and the water filling is completed, the circulation pump P is stopped and the water filling valve 11 is closed to stop the water filling operation (reference number in the drawing). 96-100).

Next, the hot water filling operation is the second step after installing the equipment.
Describe the case where the hot water filling operation is performed after the first time.

When determining the value of flag F immediately after turning on the hot water filling switch (at step 91 in the drawing), the value of flag F is ``1'' and this is the second or subsequent time filling operation. If this is confirmed, the subroutine 93 such as opening the hot water filling valve 11 is executed without performing the above-mentioned operation to detect the reference water pressure P0. By using the reference water pressure P0 written in the memory of , the steps from 96 onwards in the drawings, that is, the steps from ``'' described above are executed.

In addition, when reheating the bath pot of the above embodiment, the switching valve 37 is switched from the hot water filling state to set the reheating circuit 3 to the established reheating state, and in this state, the circulation pump P is turned off. The combustion operation of the driving and reheating gas burner 39 may be performed.

Incidentally, in the case of the above embodiment, by checking the elapse of the waiting time T1, the system waits for water to fill up in the flow path connecting the on-off valve 4 inserted into the communication flow path 33 to the bathtub 2. , a water amount counter 10 that measures the amount of hot water supplied from the hot water supply circuit 15.
It may be determined whether the flow path is filled with water or not.

Furthermore, in the above embodiment, by directly connecting the circulation pump P and the bath heat exchanger 30, the auxiliary hot water filling circuit on the bath heat exchanger 30 side is maintained even at the initial stage of the hot water filling operation when the reference water pressure P0 is detected. 19 through which hot water flows, the bath heat exchanger 30
Insert a solenoid valve adjacent to the upstream side of the standard water pressure P0.
At the time of detection, water may flow only to the communication channel 33 side.

Further, in the above embodiment, the present invention was applied to a forced circulation type bathtub, but the present invention also has a method of pumping boiling water into the bathtub 2 to raise the temperature of the bathwater when the bathing water cools down. Needless to say, it can also be applied to a so-called high-temperature hot water bath. In this case, as shown in FIG. 4, the on-off valve 4 and the water pressure gauge 34 on the downstream side thereof are inserted into the hot water filling circuit 17 connected to the high-temperature hot water type bath, and the tip of the hot water filling circuit 17 is inserted. What is necessary is to make it protrude into the bathtub 2 and bend the protrusion upward.

[Brief explanation of drawings]

Fig. 1 is a piping diagram of the embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the embodiment of the invention, Fig. 3 is a detailed diagram of the spout 29 portion, Fig. 4 is an explanatory diagram of the second embodiment, Figure 5 is an explanatory diagram of the prior art, and in the figure, 15...Hot water supply circuit, 2...Bathtub, 3...Reheating circuit, 4...Opening/closing valve, 30...Bath heat exchanger,
33...Connection channel, 34...Water pressure gauge, P0...Reference water pressure.

Claims (1)

[Claims] 1 Hot water filling circuit 1 connected to the side wall of bathtub 2 via piping
7 and an on-off valve 4 inserted into this hot water filling circuit 17
and a water pressure gauge 34 on the downstream side of the water pressure gauge 34, so that the water that starts flowing into the hot water filling circuit 17 at the beginning of the hot water filling operation is connected to the on-off valve 4 and the water pressure gauge 34 at the downstream end of the hot water filling circuit that opens into the bathtub 2. The opening/closing valve 4 is closed when the water is filled between then and the water pressure gauge 34 detects the water pressure after the valve is closed. In a bathtub equipped with an automatic hot water filling function that stops the hot water filling operation based on a judgment, the hot water filling circuit 17
A bathtub having a hot water filling function, in which the tip of the hot water filling circuit 17 is made to protrude into the bathtub 2, and the vicinity of the tip of the hot water filling circuit 17 is bent upward to form a rising portion 49.