JPH0710207Y2 - Automatic bath equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an automatic bath device that drops hot water to a set water level in a bathtub and automatically stops it.

(Prior Art and Problems) In the conventional automatic bath device of this type, the water level in the bathtub is detected by installing a water level detector as shown in Japanese Utility Model Publication No. 61-84461.

However, in such a conventional one, when the main body of the automatic bath device is installed at a position remote from the bathtub, construction for connecting the signal line of the water level detector is required, and there is a risk of disconnection of the signal line and electric leakage, The repair was also troublesome.

Therefore, the applicant of the present application has previously proposed, in Japanese Patent Laid-Open No. 63-21439, a device in which a pressure sensor is provided in the main body of the device so that the water level of a bathtub at a remote position can be detected. However, since one of the circulation paths consisting of the forward pipe and the return pipe is used for transport by dropping and the other is for pressure detection, it is necessary to air purge the inside of the pipe for pressure detection, and the pipe for pressure detection is used for the transport route. The air was purged by switching to and transporting hot water. By opening and closing the solenoid valve during this switching, the flow of hot water pressurized by the pump is rapidly interrupted, causing a water hammer, and the impact pressure is applied to the pressure sensor, which adversely affects the durability of the sensor. There was a problem that lowers. At the same time, the hot water in the pipe tends to flow out into the bathtub due to inertia, and the inside of the pipe may momentarily become a negative pressure to suck air from the bathtub, which causes a problem that air purge is not achieved and erroneous detection is caused. Further, this negative pressure causes air to be sucked into the detection oil chamber inside the pressure sensor.

The present invention solves the above problems, and aims to reduce the water hammer to reduce the influence on the sensor, prevent the air displacement, and eliminate erroneous detection.

(Means for Solving Problems) In order to solve the above problems, the present invention drops water into a bathtub from a main body located at a remote position from a bathtub through a reheating circulation path consisting of a forward pipe and a return pipe. In this case, a pump is arranged in the return pipe, and one side is connected to the suction side of the pump and a three-way valve is connected to the hot water supply part, and the other side is connected to the hot water supply section. The pump discharge side three-way valve is connected to a short-circuit path that bypasses the pump by branching the pump suction side three-way valve from the pump suction side three-way valve to the bathtub side return pipe. Connected to the return pipe to the heater,
An electromagnetic valve is provided in the return pipe from the three-way valve on the pump discharge side to the bath heater or in the short-circuit path, and a detour circuit that bypasses the electromagnetic valve is provided, and a pressure sensor is provided in the detour circuit. .

(Operation) Since the present invention uses the above means, it is possible to reduce the water hammer that occurs when the transfer path is switched after the air purging of the pump is completed, to reduce the influence on the pressure sensor, and to prevent the air replacement in the pipe to be erroneous. No detection.

(Embodiment) FIG. 1 shows an embodiment of the present invention, in which (1) is an automatic bath apparatus body. (2) is a water heater, and (3) is a bath heater, which is provided in the main body (1). (4) is a bathtub located at a remote position from the main body (1). Reference numeral (5) is a bath hot water supply pipe branched from the hot water supply pipe (7) of the water heater (2), and the valve (6)
Is provided, and together with the hopper (13) which opens to the atmosphere and cuts off the hot water from the bath hot water supply pipe (5), forms a bathtub drop hot water supply unit. (8) and (9) are reheating circuits, which include a forward pipe (8) from the bath heater (3) to the bathtub (4), and a return pipe (8) returning from the bathtub (4) to the bath heater (3). 9) and. A pump (10) is provided in the middle of the return pipe (9). (12) is a three-way valve connected to the suction side of the pump (10), one of the three-way valve (12) is connected to the return pipe (9) and the other is connected to the hopper (13). (16) is a three-way valve provided on the discharge side of the pump (10), one side of the three-way valve (16) is connected to the return pipe (9) and the other bypasses the pump (10) and returns to the return pipe (9). ) Is connected to a short-circuit path (14) branching upstream. The short circuit (14)
A solenoid valve (15) is provided in the solenoid valve, and a detour (17) that bypasses the solenoid valve (15) is further provided. Reference numeral (18) is a pressure sensor provided in the detour (17) for detecting pressure based on the water level in the bathtub (4). The pressure sensor (18)
Is a semiconductor pressure sensor that transmits water pressure to a semiconductor through silicon oil isolated by a diaphragm.

The operation of this embodiment having the above configuration will be described. When the automatic hot water supply is commanded, first the valve (6) is opened to supply hot water to the hopper (13) and the three-way valve (12) is switched to the hopper (13) side. Then, the solenoid valve (15) is opened, the three-way valve (16) is switched to the short-circuit path (14) side, the pump (10) is operated, and the return pipe (9) and the short-circuit path upstream of the three-way valve (12). Pour hot water into (14) to purge the inside of the pipe with air. After air purging for a predetermined time, the solenoid valve (15) is closed and the three-way valve (16) is switched to the bath heater (3) side to convey hot water from the outward pipe (8) to the bathtub (4), while the return pipe (9) is being supplied. ) To detect the water pressure applied to the pressure sensor (18).

Depending on the piping conditions from the main body (1) to the bathtub (4) and the positional relationship between the main body (1) and the bathtub (4), the return pipe may reach before the water level of the bathtub (4) reaches the bus adapter (19). Although air may enter the inside of (9), the flow path may be switched at an appropriate time interval to purge the inside of the return pipe (9) with air. And the pressure sensor (18) shows the set water level (L).
If the water pressure corresponding to is detected, the valve (6) is closed and the bathtub (4)
To finish automatic hot water supply to.

By the way, when the inside of the return pipe (9) is air-purged and the circuit is switched to the bath heater (3) side, when the solenoid valve (15) is closed, the hot water tends to flow toward the bathtub (4) due to inertia, and the solenoid valve ( Downstream of 15) momentarily becomes negative pressure. Next, the negative pressure causes the hot water to be drawn back to become a positive pressure, and this pressure fluctuation acts as a water hammer to impact the pressure sensor (18), and in some cases, when the hot water is drawn back, the bathtub (4)
However, in the present invention, a detour (17) that bypasses the solenoid valve (15) and a pressure sensor (18) are provided in the detour (17). Can be resolved. That is, when switching the circuit from the bathtub (4) side of the return pipe (9) to the bath heater (3) side, the solenoid valve (15) is closed and the three-way valve (1
6) is switched, but it takes several seconds for the closure of the three-way valve (16) to rotate to switch the flow path, and the solenoid valve (15) is closed instantly, so it was closed. The closing pressure of the pump (10) is applied to the upstream side of the solenoid valve (15) via the three-way valve (16). Further, as described above, a negative pressure is generated on the downstream side of the solenoid valve (15) due to the inertia of the hot water. These are eliminated via the detour (17). That is, the hot water flows through the bypass (17) to the downstream side of the solenoid valve (15), and the negative pressure is released.

As shown in FIG. 2, the solenoid valve (15) is replaced with a three-way valve (16).
The same thing can be done by providing a bypass line (17) that bypasses the electromagnetic valve (15) in the return pipe (9) on the downstream side of. That is, when automatic hot water supply is commanded, first the valve (6) is opened to supply hot water to the hopper (13) and the three-way valve (12) is opened to the hopper (13).
Switch to the side. Then, the solenoid valve (15) is opened, the three-way valve (16) is switched to the bath heater (3) side, and the pump (10) is operated to bypass the return pipe (9) on the downstream side of the three-way valve (16). Hot water is flown through the passage (17) and the outward pipe (8) to purge the inside of the pipe with air. After air purging for a predetermined time, the solenoid valve (15) is closed and the three-way valve (16) is switched to the short-circuit path (14) side to convey hot water from the return pipe (9) to the bathtub (4), while the forward pipe (8) is being sent. And the pressure sensor (18) via the return pipe (9) on the downstream side of the three-way valve (16).
The water pressure applied to is detected.

Depending on the piping conditions from the main body (1) to the bathtub (4) and the positional relationship between the main body (1) and the bathtub (4), the forward pipe may reach by the time the water level of the bathtub (4) reaches the bus adapter (19). Although air may enter the inside of (8), the flow path may be switched at an appropriate time interval to purge the inside of the forward pipe (8) with air. And the pressure sensor (18) shows the set water level (L).
If the water pressure corresponding to is detected, the valve (6) is closed and the bathtub (4)
To finish automatic hot water supply to.

By the way, when the return pipe (9), the bypass (17) and the forward pipe (8) on the downstream side of the three-way valve (16) are air-purged to switch the circuit to the short-circuit path (14) side, the solenoid valve (15) Closed, the hot water tries to flow toward the bathtub (4) due to inertia, and the solenoid valve (15)
The downstream side of is a negative pressure for a moment. Next, the negative pressure causes the hot water to be drawn back to become a positive pressure, and this pressure fluctuation acts as a water hammer to impact the pressure sensor (18), and in some cases, when the hot water is drawn back, air is removed from the bathtub (4). In the present invention, this is solved by providing a detour (17) bypassing the solenoid valve (15) and providing a pressure sensor (18) in the detour (17). be able to. That is, when switching the circuit from the bath heater (3) side in the return pipe (9) to the bathtub (4) side, the solenoid valve (15) is closed and the three-way valve (16) is switched. It takes a few seconds for the closure to rotate and the flow path to switch, and the solenoid valve (15) is closed instantly, so a three-way valve is located upstream of the closed solenoid valve (15). The closing pressure of the pump (10) is applied via (16). Further, as described above, a negative pressure is generated on the downstream side of the solenoid valve (15) due to the inertia of the hot water. These are eliminated via the detour (17). That is, the hot water flows through the bypass (17) to the downstream side of the solenoid valve (15), and the negative pressure is released.

Moreover, in the case of FIG. 2, the pressure sensor (1
Negative pressure is not applied to 8), which is more advantageous for sucking air into the pressure sensing oil chamber inside the pressure sensor (18).

(Effect of the Invention) The present invention has the following excellent effects. That is, it is possible to reduce the impact on the pressure sensor by reducing the water hammer that occurs when the transfer path is changed after the air purge, which contributes to the improvement of the durability of the pressure sensor and prevents the displacement of air in the pipe to ensure accurate water pressure. It enables detection.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention. Second
The drawing is an overall schematic view showing another embodiment of the present invention. (1) …… Main body (4) …… Bathtub (8) …… Outgoing pipe (additional heating circuit) (9) …… Return pipe (additional heating circuit) (10) …… Pump (11) …… Pressure Sensor (12) (16) …… Three-way valve (14) …… Short circuit (15) …… Solenoid valve (17) …… Detour circuit (18) …… Pressure sensor

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hot water supply system, wherein a main body located at a remote position from a bathtub is dropped into a bathtub through a reheating circulation path composed of a forward pipe and a return pipe to supply hot water, and a pump is arranged in the return pipe and a suction side of the pump. Has a three-way valve with one side connected to the return pipe and the other side dropped into the bathtub and connected to the hot water supply section.A three-way valve is also arranged on the discharge side of the pump, and one side of the three-way valve on the pump discharge side is connected to the pump suction side. From the three-way valve on the bathtub side and connected to the short-circuit path that bypassed the pump, and connected the other side of the pump discharge-side three-way valve to the return pipe to the bath heater and from the pump discharge-side three-way valve. An automatic bath apparatus, characterized in that a solenoid valve is provided in a return pipe to the bath heater or in the short-circuit path, and a bypass circuit bypassing the solenoid valve is provided and a pressure sensor is provided in the bypass circuit.