JPH1094696A - Water supply device and water supply method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply device and a water supply method capable of coping with the rise of an internal pressure acting when the water supply of an external part to pour water is stopped with simple and low-cost constitution without raising the pressure withstanding force of a water passing route. SOLUTION: One side of an excessive pressure relief valve 28 is connected to a bypass path 27d and the other side is connected to a pipe line 27a on the side of a bathtub 4 on the downstream side of a first three-way valve 21 in a circulation circuit. Even though it is the time of supplying the water from a water supply circuit to which a city water direct pressure is applied to a washing machine 3 or the time of supplying the water inside the bathtub 4 to which the discharge pressure of a pump 11 is applied through the circulation circuit to the washing machine 3, when a solenoid valve 30 on the side of the washing machine 3 is closed and the internal pressure inside a water supply route is to be raised by a water supply source pressure, passing water is discharged to the side of the pipe line 27a and the pressure inside the water supply route does not become higher than a prescribed pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply apparatus and a water supply method configured to supply water to the outside of a bathtub in addition to supplying hot water to a bathtub, and more particularly to a water injection valve of a washing machine when water is supplied to a washing machine. The present invention relates to a water supply device and a water supply method that reduce the influence of internal pressure acting on the water passage when the valve is closed.

[0002]

2. Description of the Related Art There is a water supply apparatus which switches between water from a hot water heater, hot water or residual water from a bathtub, and injects water as washing water for a washing machine. Such an apparatus is described in, for example, JP-A-7-127908, and is configured to appropriately select warm water or water according to the washing and rinsing steps and supply the water to the washing machine. Such a water supply device is systematized so as to operate according to a preset program corresponding to the washing process of the washing machine and interlock with a control system of the washing machine.

[0003]

According to the above-described water supply device, when the water injection electromagnetic valve on the washing machine side is closed during the water supply from the water supply device to the washing machine, the water flow in the water passage is stopped. Water supply pressure is directly applied and water pressure rises sharply. For this reason, the required pressure burden is imposed on each part in the water flow path,
Increasing the pressure resistance in response to this will increase manufacturing costs. Further, unpleasant noise generated when the water injection solenoid valve is closed, so-called water hammer noise is generated. In order to reduce such inconveniences, in the case of water supply by direct tap water pressure, the water supply source side is closed by a pressure sensor 61 disposed in the water flow path, and additional heating by a pressure relief valve 52 is performed. The circuit 20 is configured to discharge the overpressure water. However, in such a configuration, although it works effectively when the tap water is supplied with direct pressure, when the water is supplied from the bathtub through the reheating circuit 20, the discharge destination is in an overpressure state. Therefore, discharge of overpressure water cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a first object of the present invention is to provide an over-pressure water that acts when a valve is closed to a passage to a water passage. An object of the present invention is to provide a water supply device and a water supply method that can be coped with with a simple and low-cost structure without increasing the pressure resistance. A second object of the present invention is to reliably avoid the influence on the water flow path for overpressure water that acts when the valve is closed, regardless of whether the water is supplied by direct water pressure or supplied from bathtub water. And a highly reliable water supply device and a water supply method. A third object of the present invention is to
An object of the present invention is to provide a quiet water supply device and a water supply method that prevent generation of unpleasant sounds such as a water hammer sound caused by overpressure water supply at the time of valve closing.

[0005]

In order to achieve the above-mentioned object, the invention of a water supply apparatus according to claim 1 of the present invention comprises a circulation circuit which is connected to a bathtub and circulates bathtub water; An external water injection circuit provided by branching from a circuit, and one of the external water injection circuit and the circulation circuit, in which the internal pressure rises at a water supply source pressure due to blockage of an external water injection side during water injection into the external water injection circuit. And the other part of the circulation circuit in which the internal pressure does not increase due to the water supply source pressure due to the blockage, to prevent the internal pressure from rising above a predetermined pressure. And means ”.

According to this solution, the internal pressure rises in the circulation circuit and the external water injection circuit due to the water supply source pressure due to the blockage of the external water injection side during the water injection from the circulation circuit to the external water injection circuit. I do. At this time, the internal pressure does not increase because the water supply source pressure is not applied to the other part of the circulation circuit that is not a water passage. The overpressure prevention means prevents the internal pressure from rising above a predetermined level. The overpressure prevention means includes a circuit side where the internal pressure rises due to the water supply source pressure and a circuit side where the internal pressure does not rise. And is provided between them. As a result, even if the water is blocked on the external water injection side, the internal pressure in the water passage due to the water supply source pressure does not increase more than a predetermined value. According to the present invention, by arranging the overpressure preventing means as described above in order to avoid such an influence of the overpressure water supply, it is possible to manufacture with a simple configuration and at low cost.

[0007] The invention of the water supply device according to claim 2 is as follows.
`` A water supply path supplied from a water supply source, a circulation circuit connected to the water supply path, for supplying water to the bathtub and returning water from the bathtub to the water supply path side, and the water supply path and the circulation circuit in the circulation circuit A switching unit provided on the downstream side with respect to the connection unit, an external water injection circuit provided by branching from the circulation circuit via the switching unit, and the water supply path, the circulation circuit or the external water injection circuit. An overpressure prevention member, one of which is connected to a portion serving as a water flow path at the time of external water injection, and the other is connected to a bathtub side downstream of the switching means in the circulation circuit. Regardless of whether water is supplied from the water supply channel or bathtub water from the circulation circuit, when the external water injection side is closed and a water supply pressure of a predetermined level or more acts on the water passage, the excess water is supplied. Prevention member water passed through the is discharged to the downstream of the tub side of the circulation circuit "that is obtained by said.

According to this solution, when a water supply source pressure higher than a predetermined value is applied to the water flow path, an over-pressure preventing member that allows the water supply to pass and prevents the internal pressure of the water flow path from rising above a predetermined value. Was used. One of the overpressure preventing members is connected to a portion of the water passage on the side where the internal pressure is about to increase, and the other is connected to the bathtub downstream of the switching means of the circulation circuit. The bathtub side downstream of the switching means in the circulation circuit is isolated from the external water injection circuit side by the presence of the switching means when supplying water to the external water injection circuit.

For this reason, the water supply to the external water supply circuit may be water supply from the water supply passage, for example, when water pressure is applied directly.
Alternatively, even when bath water from the bathtub is supplied through the circulation circuit, all of the water is supplied to the external water injection circuit by the switching means and flows into the bathtub downstream of the circulation circuit isolated by the switching means. I will not do it. That is, during the supply of water to the external water injection circuit, the bathtub downstream of the switching means in this circulation circuit is in a state where no water flows.
As a result, the external water injection side is closed, the water flow is stopped, the water supply source pressure is directly applied to the water passage, and even if the internal pressure of the water passage is going to increase, the overpressure prevention member does not become a pressure higher than a predetermined value. Pass the water supply. Then, the water that has passed through the overpressure prevention member can easily flow into the downstream bathtub side of the circulation circuit. Since there is no water flow on the downstream side of the bathtub, the water that has passed easily flows in and is easily discharged to the bathtub side. Therefore, in external water injection,
Regardless of the water supply from the water supply channel or the bathtub water from the circulation circuit, even if the external water injection side is closed and the pressure exceeding the predetermined level acts on the water flow path, it passes through the overpressure prevention member. The drained water is reliably discharged to the bathtub downstream of the circulation circuit.

According to the present invention, the influence of such overpressure water supply can be avoided with a simple configuration in which the overpressure prevention member is provided in a predetermined manner as described above, and therefore, the manufacturing cost can be reduced. can do. Then, during the water injection into the external water injection circuit, the above-described effect can be reliably avoided, so that a highly reliable water supply device can be obtained. In addition, there is no unpleasant sound generated when the external water injection side is closed as in the conventional case.

[0011] The invention of a water supply method according to claim 3 is as follows.
`` Water is injected from a predetermined part of the bathtub circulation circuit to an external water injection point, and during the water injection, the water injection point is closed by closing the water injection electromagnetic valve on the water injection point side, and the water is raised by the occlusion. The water in the water passage is discharged to the bathtub downstream of the predetermined portion of the bathtub circulation circuit so that the internal pressure in the water passage does not exceed a predetermined pressure. " It is.

According to this water supply method, when the water injection point is closed and the water flow stops due to the closing of the water injection solenoid valve on the water injection point despite the water injection into the external water injection point,
The water supply source pressure is directly applied to the water passage, and the internal pressure in the water passage tends to increase. For this reason, the discharged water is easily discharged to the bathtub by discharging the feedwater to the bathtub side downstream of the predetermined portion of the circulation circuit so as not to exceed the predetermined pressure. Therefore, it is very easy to avoid such overpressure water supply, and it is possible to reliably avoid such influences, and a low cost and highly reliable water supply method can be obtained.
In addition, according to this method, there is no unpleasant sound generated when the water-injected portion is closed.

[0013]

As described above, the invention of the water supply apparatus according to the first aspect of the present invention provides an overpressure prevention means for preventing the internal pressure from rising above a predetermined pressure by providing a water supply by closing the external water injection side. Provide a part between the external water injection circuit and any part of the circulation circuit where the internal pressure rises at the source pressure and the other part of the circulation circuit where the internal pressure does not increase due to the water supply source pressure due to blockage. I made it. This makes it possible to configure a simple and low-cost structure without increasing the pressure resistance of the water passage to the overpressure water that acts at the time of blockage. In addition, regardless of the water supply from which the tap water pressure was applied or the water supply from the bathtub water, it was possible to reliably avoid the influence on the water flow path,
Further, generation of unpleasant sounds such as water hammer sounds caused by overpressure water supply at the time of blockage is also prevented.

[0014] The invention of the water supply device according to claim 2 is as follows.
During external water injection, regardless of the water supply from the water supply channel or the bathtub water from the circulation circuit, when the external water injection side is closed and a water supply pressure of a predetermined level or more acts on the water passage, the overpressure prevention member is used. The passed water was discharged to the downstream side of the circulation circuit. This makes it possible to configure a simple and low-cost structure without increasing the pressure resistance of the water passage to the overpressure water that acts at the time of blockage. In addition, regardless of the water supply from the tap water or the water from the bathtub, the influence on the water supply path can be reliably avoided. The generation of unpleasant sounds is also prevented.

In the water supply method according to the third aspect of the invention, the supply water is discharged to a downstream side of a predetermined portion of the circulation circuit so that the internal pressure in the water passage does not exceed a predetermined pressure. As a result, the influence of overpressure water supply can be reliably and easily avoided, and the reliability is low and the cost is high. In addition, according to this method, there is no unpleasant noise generated when the water injection location is closed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a water supply apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing the entire water supply device of the present invention. The appliance (1) is, for example, a water heater with a reheating function connected to a water supply source. The equipment (1) includes a reheating heat exchanger (12a) and a hot water supply heat exchanger (12
b) and a reburning burner (13a) and a hot water supply burner (13b) for heating these, and a circulation pump (11).
Are arranged. Further, the appliance (1) has an electrical unit (10) for switching the inside of the pipe (14) to a circulation state or a hot water supply state, or for controlling the operation of the pump (11) and the burners (13a) and (13b).
Is installed. The pipe (14) refers to the entire pipe in the device (1).

The water injection unit (2) switches the water or hot water supplied from the appliance (1) to an external bathtub (4) or washing machine (3) as appropriate, or supplies a pump (11) of the appliance (1). The remaining water in the bathtub (4) is supplied to the washing machine (3). For this reason, the water injection unit (2) has a pipe (15) and a pipe from the appliance (1).
Pipeline (27a), pipeline (27b) connected to (16), pipeline (29) connected via a first three-way valve (21) and a second three-way valve (22) provided in these A pipe (27c) is provided, and the first three-way valve (21)
The water passage is appropriately selected by switching the second three-way valve (22). From the water injection unit (2) to the bathtub (4),
2) and the pipe (63) are connected to the pipe (27a) and the pipe (27b), and the water supply pipe from the water injection unit (2) to the washing machine (3).
(61) is connected to the pipeline (29) to supply water or hot water.

In the water injection unit (2), when water supply pressure is generated in the forward direction with the water supply direction, that is, the direction toward the washing machine (3) as the forward direction, in the middle of the pipe (29). A check valve (24) that opens against a spring (24a) that urges in the valve direction is provided, and further in the pipeline (29), downstream of the check valve (24), A pressure switch (25) for detecting a water pressure in the pipe (29) is provided. Also, the check valve (24) and the first
A filter (23) is provided between the three-way valve (21) and the connection port c. A pipe (27c) from the connection port c of the second three-way valve (22) is connected between the check valve (24) and the filter (23). A solenoid valve (30) in the washing machine (3) is provided between the connection port a and the connection port b of the first three-way valve (21) in the pipe (27a) when the washing machine (3) is filled with water. When the valve is closed, the water pipe (6
1), a bypass line (27) provided with an overpressure relief valve (28) described below so that the water pressure in the line (29) and the line (15) does not rise excessively.
d) are connected in parallel, bypassing the first three-way valve (21).

Further, a water flow switch for detecting the presence or absence of a water flow is provided downstream of the pump (11) in the pipeline (14) in the appliance (1).
(26) is provided. Also in the water injection unit (2), based on the detection of the pressure switch (25) and the water flow switch (26), the electrical unit (20) that controls the switching of the first three-way valve (21) and the second three-way valve (22). ) Is provided. The water supply device of the above example has a configuration in which the appliance (1) and the water injection unit (2) are separated, but these may be configured as one device body.

According to the above configuration, the operation of filling the bathtub (4) with water is first selected by the remote controller (51) of the appliance, and the water injection unit (10) is controlled by the electrical units (10) and (20). 2) The first three-way valve (21) and the second three-way valve (22) are electrically connected between the connection port a and the connection port b, and the supply water introduced from the water supply source, that is, the flush water is supplied to the appliance (1). When passing through the hot water supply heat exchanger (12b) from the hot water supply heat exchanger (12b) through the hot water supply burner (13b), the hot water is heated by the combustion heat of the hot water supply burner (13b). ) And supplied to the bathtub (4) and the pipeline (16),
The water is supplied to the bathtub (4) via the pipe (27b) and the pipe (63).

Next, the operation of the water supply device in the present embodiment will be described in detail below with reference to FIGS. 2 to 4 are water supply circuit diagrams showing a water supply state, in which FIG. 2 shows a water supply state from the bathtub (4) to the washing machine (3), and FIG. 3 shows a water supply state of the filter (24). Washing condition,
FIG. 4 shows a state of supplying fresh water to the washing machine (3). FIG. 5 is an enlarged view of a main part for explaining an operation state of the overpressure relief valve (28) of the present embodiment. FIGS. 6 to 8 are flowcharts for explaining the operation of supplying water to the washing machine (3) according to the present embodiment. FIG. 6 is a flowchart showing the steps of supplying remaining water from the bathtub (4) as washing water. 7 shows a water supply step for rinsing, and FIG. 8 shows a step of supplying water as washing water. [Water supply of washing water from bathtub (4) to washing machine (3)] Washing machine
When (3) is turned on (S1), the remote control (5
2) The mode changeover switch provided in “Remaining hot water washing mode”
In the state (S2), the remaining water (or remaining hot water) in the bathtub (4) is washed by the washing machine based on the control of the electrical units (10) and (20).
Supply water to (3). 2 and 5, first, the first three-way valve (21) conducts through the connection ports a to c (S3), and the second three-way valve (22) conducts through the connection ports b to a (S4). ). Then, in (S5), the pressure switch (25) detects that the solenoid valve (3
When the valve opening of (0) is determined, the pump (11) operates (S6) and the bathtub
The remaining water from (4) goes to pipeline (63) → pipeline (27b) → pipeline (16) →
After passing through the water supply circuit of the pump (11) → reheating heat exchanger (12a) → pipe (15) → first three-way valve (21) → pipe (29) → water supply pipe (61),
Water is supplied into the washing machine (3) via the solenoid valve (30) of the washing machine (3).

Here, as shown in the figure, the washing machine (3)
An electromagnetic valve (30) as opening / closing means is provided, and a pipe (29) in the water injection unit (2) and the electromagnetic valve (30) are connected by a water supply pipe (61). In this device, the pressure switch
The opening / closing operation of the solenoid valve (30) in the washing machine (3) is detected by (25), and the water supply control of the water supply device is performed based on the detection. The pressure switch (25) is inside the connected pipeline (29) and the water supply pipe (61)
(24) and the solenoid valve (30) are substantially held in a defined sealing area (64), and the pressure switch (25) is connected to the line (2).
The threshold value is set to turn off when 9) is in the water flow state and the pressure is low.

When the remaining water is supplied from the bathtub (4) by the pump (11), the solenoid valve (30) of the washing machine (3) is open and the check valve (24) is in the forward direction. The water supply pressure acts to generate a water flow, so that the valve opening state is maintained. Here, when the control device of the washing machine (3) determines that a predetermined amount of washing water has been supplied, the solenoid valve (30) is automatically set on the washing machine (3) side.
Closes. As a result, the upstream side of the solenoid valve (30)
Although the water flow is stopped while the water supply pressure by the pump (11) is applied, the pressure switch (25) detects the pressure higher than a predetermined threshold value and turns on, and the water supply device turns on the electromagnetic valve. The valve closing of (30) is detected. Then, the pressure difference between the upstream part and the downstream part of the check valve (24) does not occur, and the check valve (24)
Is closed by the urging force of the spring (24a). That is, the pump (11) is stopped by the valve closing detection, but the solenoid valve (30) and the check valve (24)
Since water is held in a pressurized state in the sealing area (64) defined by the above, the pressure (static pressure) is higher than when water is passed, and therefore, the water is disposed in the sealing area (64). The pressure switch (25) is maintained in an on state under a pressurized state. Therefore, the solenoid valve of the washing machine
Even when (30) is in the closed state, it is not necessary to apply the water supply pressure by turning the pump or the like, and the water supply path only needs to have a pressure resistance against the sealed pressurized state. Then washing machine
(3) When the solenoid valve (30) opens due to the control of the side,
When the pressurized state of the sealed water in the sealing area (64) is released, the water pressure in the sealing area (64) decreases, and the pressure switch (25) is lower than a predetermined threshold. When the pressure is detected, the water supply device is turned off, and the water supply device detects the opening of the solenoid valve (30). When the pump (11) is actuated based on this valve opening detection, the check valve (24) opens to return to the water flowing state.

As described above, when the solenoid valve (30) is automatically closed on the washing machine (3) side even though bathtub water is supplied from the bathtub (4), FIG. Indicated pump
(11) → heat exchanger (12a) → pipe (15) → pipe (27a) → first three-way valve (21) → pipe (29) → water supply pipe (61) Then, the water supply source pressure due to the discharge pressure of the pump (11) is directly applied to each of the above-mentioned parts. As a result, the internal pressure rises, and an excessive pressure tends to act on the above-mentioned parts, so that a required pressure load is imposed on the respective parts of the water supply in the above-mentioned path.
However, according to this embodiment, the first three-way valve of the line (27a)
An overpressure relief valve (28) as an overpressure prevention member is provided in a bypass passage (27d) that bypasses (21), so that a pressure exceeding a certain level is not applied to the water passage.

The operation of the overpressure relief valve (28) will now be described with reference to FIG. FIG. 5 shows the vicinity of the first three-way valve (21) in the circuit of FIG. 1, and FIG. 5 (a) shows a state in which bathtub water in the bathtub (4) is supplied to the washing machine (3). , FIG.
(B) shows a state in which the solenoid valve (30) of the washing machine (3) is closed . First, in FIG. 5 (a), when water is supplied to the washing machine (3), since the solenoid valve (30) is opened, the bathtub water is supplied to the pipeline which is a part of the "circulation circuit" as described above. (15) and pipeline
After (27a), the first three-way valve (21) which is the "switching means"
From the pipeline (2
Water is supplied to the washing machine (3) through the water supply pipe (9) and the water supply pipe (61).

One of the overpressure relief valves (28) is connected to the pipe (15) side, and the other is to the bathtub (4) side, that is, the first in the circulation circuit.
Bypass path (27d) connected downstream from the three-way valve (21)
It is arranged in. The overpressure relief valve (28) maintains the closed state by the urging force of the spring (28a) when the pressure of the supply water acting on it is within a predetermined value, and exceeds the urging force of the spring (28a) when it exceeds the predetermined value. Open the valve. Then, when the overpressure relief valve (28) is opened, the bypass path (27d) becomes conductive and water passes. In the water supply state shown in FIG. 5A, a threshold value is set by the urging force of the spring (28a) so that the overpressure relief valve (28) is closed, so that the bypass path (27d) is disconnected. Has become. Therefore, during water supply, the pipe (27a) and the pipe (62) leading to the bathtub (4) on the circulation circuit side are in a state of no water flow. When the solenoid valve (30) is closed despite the fact that water is being supplied from the pipe (15) side, the pipe (15) → pipe (27d) → first Three-way valve (21) → Pipe line (29)
→ Because the feed water pressure by the pump (11) is applied directly between the water supply pipes (61), the pressure tends to rise rapidly. However, since this pressure rise exceeds a predetermined threshold value set for the overpressure relief valve (28), the overpressure relief valve (28) increases the feedwater pressure as shown in FIG. 5 (b). Open with.

By the opening of the valve, the passing water (33) flows from the pipe (27a) on the side of the bathtub (4) where water is not passed through to the pipe (6).
It flows into bathtub (4) via 2). The discharge of the passing water (33) is performed until the pressure of the supply water acting on the overpressure relief valve (28) decreases to a predetermined threshold value, so that a certain pressure or more is not applied in the water passage. Therefore, even if the solenoid valve (30) is closed while water is being supplied to the washing machine (3), the overpressure relief valve (28)
Thereby, it is possible to avoid the influence of such overpressure water supply acting on each part in the water passage. And washing machine (3)
The water is supplied to the downstream side of the first three-way valve (21) in the circulation circuit, that is, from the pipe (27a) through the pipe (62) to the bathtub (4).
The flow path (bath tub inflow path) leading to the water is in a state where there is no water flow. Therefore, the passed water (33) can easily flow into this flow path, so that the overpressure relief valve (28) functions reliably. Can be done.

Now, return to the steps of FIG. 6 again. When the water flow switch (26) detects OFF and there is no water flow (S7), and when the pressure switch (25) is ON (S8), a predetermined amount of remaining water is supplied into the washing machine (3). Then, it can be recognized that the control device of the washing machine (3) has closed the solenoid valve (30). Accordingly, the pump (11) is stopped (S9). In (S8),
If there is no water flow (S7) and the pressure switch (25) remains off, the pump (1
1) is stopped (S81), and the “wash water mode” of FIG.
To (S101).

Next, when a predetermined time has elapsed ((S10); 3 minutes or more in this embodiment) after the pump (11) is stopped in (S9), the control device of the washing machine injects washing water for the washing process. The filter (23) cleaning step (S11) to
Proceed to (S13) .If not, switch the pressure switch (2
5) is OFF (solenoid valve (30) is open)
After the determination in (S10a), if the water is in the OFF state, the amount of water supply in the washing machine (3) is insufficient, and the pump is turned on to perform the water supply operation again (S10b), and then returns to (S7).

In the filter (23) washing step, as shown in FIG. 3, the first three-way valve (21) is switched from the connection port c to the connection port b.
(S11), the second three-way valve (22) is switched from the connection port a to the connection port c (S12), and the water beam operation of (S13) is performed. That is, the flush water introduced from the water supply source by opening the water supply valve (k) is supplied from the pipe (14) of the appliance (1), and the water is supplied from the pipe (16) to the pipe
(27b) → Second three-way valve (22) → Pipe (27c) → Pipe (29) → Filter (23) → First three-way valve (21) → Pipe (27a) → Via pipe (62) Is discharged into the bathtub (4), whereby the filter (23) is washed. In this washing step, when the flow counter (not shown) counts up to 5 liters, the water supply valve (k) is closed to stop water supply. [Water Supply as Rinsing Water to Washing Machine (3)] Following the above, the step of supplying the washing water as rinsing water will be described below with reference to FIGS. When the filter cleaning step (S13) is completed, the first three-way valve (21) is connected to the connection ports a to c.
(S20) and the second three-way valve (22) is plugged.
(S21) is performed. As a result, as shown in FIG. 4, the water supply path passes from the water supply valve (k) of the pipe (14) of the appliance (1) to the heat exchanger (1).
2b) (12a) → Pipe (15) → Pipe (27a) → First three-way valve (21) → Pipe (29) → Route to washing machine (3) via water supply pipe (61) is formed. You. Here, when the control device of the washing machine (3) opens the solenoid valve (30) to perform the rinsing process, it is determined that the pressure switch (25) is off (S22), and the water supply of the appliance (1) is performed. valve
(k) is opened and fresh water is supplied from the water supply source (S23) (water beam operation). When the control device of the washing machine (3) determines that a predetermined amount has been supplied to the washing machine (3), the washing machine (3) turns on the solenoid valve (30).
The valve is closed to perform a rinsing operation.In this case, when the water flow switch (26) is off and there is no water flow (S24) and the pressure switch (25) detects the on state (S25), the electromagnetic switch is turned off. valve
(30) is determined to be closed and the water supply valve is closed to stop water supply (S2
6) When the water flow switch is off (S25) and the pressure switch (25) is off, the solenoid valve (30) is not closed but there is no water supply, that is, it is determined that the water supply is cut off, and the water supply valve ( K) is closed to stop the water beam operation (S251)
Then, an error display (S29) is performed.

When the rinsing operation of the washing machine (3) is repeated again, the solenoid valve (30) is opened accordingly, the pressure switch (25) is detected to be off (S27), and the water supply step is started. Return to the routine of (S23). If a predetermined time has elapsed (20 minutes or more in this embodiment) from the first stop of water supply in (S26), and it is determined that the pressure switch (25) is in the ON state (S27), (S28) It is determined that the rinsing process has been completed in the machine. Until the elapse of 20 minutes, it is determined that the rinsing process is in the middle of the rinsing process, and every time it is determined that the solenoid valve (30) has been opened by turning off the pressure switch (25), the routine returns to the (S23) routine, and the rinsing process is performed. Do a water beam for [Water supply as washing water] Washing machine using washing water
The step of supplying washing water to (3) will be described with reference to FIGS. When the washing machine (3) is turned on and the mode changeover switch provided on the remote control (52) of the water injection unit is in the "washing mode" (corresponding to step (S2) in FIG. 6), first the first three-way The valve (21) is switched to conduction to the connection ports a to c (S101), and the second three-way valve (22) is closed (S10).
2) is done. As a result, as shown in FIG. 4, the water supply path passes from the water supply valve (k) of the pipe (14) of the appliance (1) to the heat exchanger (1).
2b) (12a) → Pipe (15) → Pipe (27a) → First three-way valve (21) → Water supply path (29) → Route to washing machine (3) via water supply pipe (61) is formed. In (S103), when the pressure switch (25) is turned off and the solenoid valve (30) is determined to be open, the water supply valve (k) opens and the appliance
Water is supplied (S104) from the water supply source of (1) (water beam operation). Next, when the control device of the washing machine (3) determines that a predetermined amount of water has been supplied and the solenoid valve (30) closes, the water flow switch is turned off (S105) and the pressure switch (25) is turned off. On state
(S106) is detected, and the water supply valve (k) is closed to stop water supply (S107). If water flow switch (26) is off
If the pressure switch (25) remains off (S105) (S106), it is determined that the water supply has been cut off, and in this case also, the water supply operation is stopped (S1061) and an error display is performed. Then, when a predetermined time has elapsed ((S108); three minutes or more in this embodiment) after the stop of the water supply in (S107), it is assumed that the control device of the washing machine has determined that the injection of the washing water for the washing process has been completed. Then, the process proceeds to the rinsing step (S22) already described. If the predetermined time has not elapsed, check whether the pressure switch (25) is in the off state.
(S1081) is detected and the opening of the solenoid valve (30) is determined. If the solenoid valve is in the off state, the water supply is determined to be insufficient and the water jetting operation of (S104) is performed again.

The water supply apparatus according to the present invention is implemented as described above, and is a circulation circuit from the bathtub (4), a pipe (63) → a pipe (27b) → a pipe (16). → Pipe (14) → Pipe
(15) → Via the pipe (27a) → via the external water injection circuit, the pipe (29) → water injection using the water supply path to the water supply pipe (61). By closing the valve (30), the water flow is stopped, whereby the pump (11)
Internal pressure tends to increase due to the discharge pressure (water supply source pressure). At this time, the first of the circulation circuits
The internal pressure does not increase in the pipe (27a) and the pipe (62) on the side of the bathtub (4) from the three-way valve (21) due to the water supply source pressure. An over-pressure relief valve (28) as an over-pressure prevention means is provided in the pipeline on the side of the pipeline (15) where the internal pressure tends to increase due to the water supply source pressure.
Between the (27a) side and the pipe (27a) side on the bathtub (4) side where the internal pressure does not rise due to the water supply source pressure (that is, downstream from the first three-way valve (21) in the circulation circuit). It is provided in. For this reason, even if the internal pressure is going to increase due to the water supply source pressure in the water passage due to the closing of the solenoid valve (30), the water (33) that has passed through the overpressure relief valve (28) is (27a) side), the water pressure in the water passage does not exceed a predetermined value by the overpressure relief valve (28).

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an entire water supply device according to an embodiment of the present invention.

FIG. 2 is a water supply circuit diagram for explaining a water supply state in the water supply path of FIG. 1;

FIG. 3 is a water supply circuit diagram for explaining a water supply state in the water supply path of FIG. 1;

FIG. 4 is a water supply circuit diagram for explaining a water supply state in the water supply path of FIG. 1;

FIG. 5 is an enlarged view for explaining the operation of an overpressure relief valve (28) in the water supply path of FIG.

FIG. 6 is a flowchart showing the operation of the water supply device according to the embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the water supply device according to the embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the water supply device according to the embodiment of the present invention.

[Explanation of symbols]

(1) ... instrument (22) ... second three-way valve (2) ... water injection unit (24) ... check valve (3) ... washing machine (25) ... pressure sensor (4) ... bathtub (28) ... overpressure relief valve (11) ... pump (30) ... water supply channel (21) ... first three-way valve Indicates the same or corresponding parts.

Claims (3)

[Claims] 1. A circulation circuit connected to a bathtub to circulate bathtub water; an external water injection circuit branched from the circulation circuit; Between any part of the external water supply circuit and the circulation circuit where the internal pressure rises at the water supply source pressure, and another part of the circulation circuit where the internal pressure does not rise at the water supply source pressure due to the blockage And an overpressure prevention means for preventing an increase in the internal pressure from exceeding a predetermined pressure. 2. A water supply path supplied from a water supply source, a circulation circuit connected to the water supply path, for supplying water to the bathtub and returning water from the bathtub to the water supply path side, and the water supply path in the circulation circuit. A switching unit provided on the downstream side with respect to a connection portion between the water supply circuit and the circulation circuit; an external water injection circuit branched from the circulation circuit via the switching unit; and the water supply path, the circulation circuit or Of the external water injection circuit, one is connected to a portion that becomes a water passage when external water is injected, and the other is connected to a bathtub side downstream of the switching means in the circulation circuit, comprising an overpressure prevention member. In the external water injection, regardless of the water supply from the water supply channel or the bathtub water from the circulation circuit, the external water injection side is closed and a predetermined water supply pressure acts on the water passage. , Said water passing through the overpressure prevention member is discharged to the downstream of the tub side of the circulation circuit, a water supply device, characterized in that. 3. Water is injected from a predetermined portion of the bathtub circulation circuit to an external water injection point, and during the water injection, the water injection point is closed by closing a water injection solenoid valve on the water injection point side. Thereby, the water in the water passage is discharged to the bathtub downstream of the predetermined part of the bathtub circulation circuit so that the internal pressure in the rising water passage does not exceed a predetermined pressure. Characteristic water supply method.