JP5179399B2 - Water supply valve device - Google Patents

Description

  The present invention relates to a water supply valve device provided in a water supply channel of a device that uses water such as a dishwasher.

  The dishwasher is configured to supply water to the washing tank through a water supply channel, and a water supply valve including an electromagnetic valve is provided in the water supply channel. Here, if the water supply valve fails to stop water due to a failure or biting of foreign matter, water supply to the cleaning tank may continue and a water leakage accident may occur in which water overflows from the cleaning tank.

  Therefore, conventionally, as a water supply valve device provided in the water supply channel, one having an upstream first electromagnetic valve and a downstream second electromagnetic valve connected in series is known (see, for example, Patent Document 1). ). According to this, even if one of the first and second solenoid valves fails, water supply can be stopped by the other solenoid valve, and the possibility of a water leakage accident can be reduced.

  Here, Patent Document 1 discloses a configuration in which both the first and second electromagnetic valves are constituted by pilot-type electromagnetic valves. The pilot type solenoid valve is defined on the back side of the main valve, which is a diaphragm that opens and closes the main valve hole established in the valve seat, and communicates with the inflow chamber formed around the valve seat via the orifice hole. A back pressure chamber, a pilot valve that opens and closes a pilot valve hole that communicates the back pressure chamber and the main valve hole, and a solenoid that opens and closes the pilot valve. When the pilot valve is closed, the water flowing into the back pressure chamber from the inflow chamber through the orifice hole is contained in the back pressure chamber, and the water pressure in the back pressure chamber becomes equal to the water pressure in the inflow chamber. Then, the main valve is closed when the pressing force due to the water pressure of the back pressure chamber acting on the back surface of the main valve exceeds the pressing force due to the water pressure acting on the front surface of the main valve. The pressing force acting on the front surface of the main valve is the combined force of the pressing force due to the water pressure in the inflow chamber and the pressing force due to the water pressure in the main valve hole, but the water pressure in the main valve hole is lower than the water pressure in the inflow chamber. The pressing force acting on the back surface of the main valve exceeds the pressing force acting on the front surface of the main valve. When the pilot valve is opened, water in the back pressure chamber flows out through the pilot valve hole, and the pressing force acting on the back of the main valve falls below the pushing force acting on the front of the main valve. Then, water flows from the inflow chamber to the main valve hole. A pilot type solenoid valve can open a main valve by opening a small pilot valve to flow a large flow of water. Therefore, there is an advantage that the solenoid can be downsized to reduce power consumption.

  By the way, when both the first and second solenoid valves are constituted by the pilot type solenoid valve as described above, the main valve is closed by closing the pilot valve of one of the first solenoid valve and the second solenoid valve. If the pilot valve of the other solenoid valve is closed after that, the difference between the pressing force acting on the back surface of the main valve of the other solenoid valve and the pressing force acting on the front surface of the main valve No pressure is generated, and the main valve of the other solenoid valve cannot be completely closed. And even if one solenoid valve that is closed in advance causes a slight leak due to the biting of foreign matter, the other solenoid valve does not close completely because there is almost no differential pressure, resulting in poor water stoppage. .

Japanese Patent Laying-Open No. 2007-321937 (paragraph number 0016, FIG. 2)

  In view of the above, the present invention provides a water supply valve device capable of preventing the occurrence of water stop failure as much as possible in the case where both the first and second electromagnetic valves are constituted by pilot type electromagnetic valves. That is the issue.

  In order to solve the above-described problems, the present invention provides a water supply valve device provided in a water supply channel of a device that uses water, the first electromagnetic valve on the upstream side and the second electromagnetic valve on the downstream side connected in series. And a control means for controlling both the first and second solenoid valves, the first and second solenoid valves being a main valve comprising a diaphragm for opening and closing a main valve hole opened in the valve seat. And a back pressure chamber that is defined on the back side of the main valve and communicates with the inflow chamber formed around the valve seat via the orifice hole, and a pilot valve hole that communicates the back pressure chamber and the main valve hole. The control means is a pilot of one of the first solenoid valve and the second solenoid valve at the time of water stoppage. After closing the valve, close the pilot valve of the other solenoid valve. The first water stop control is executed, and when a water stop failure occurs, the pilot valve of the other solenoid valve is opened once with the pilot valve of the one solenoid valve opened. The second water stop control is performed to perform the valve closing at least once.

  According to the present invention, one solenoid valve that is closed in advance by the first water stop control causes a slight leak due to the foreign matter being caught, and the other solenoid valve is not completely closed, resulting in a water stop failure. In this case, the pilot of the other solenoid valve is closed in order to close the pilot of the other solenoid valve while the main valve is opened by opening the pilot valve of one solenoid valve by the second water stop control. Unless the pressing force acting on the back surface of the valve exceeds the pressing force acting on the front surface of the main valve and the foreign solenoid bites in the other solenoid valve, the main valve of the other solenoid valve is securely closed, The water stop defect is eliminated. In the second water stop control, the main valve is opened by opening the pilot valve of one solenoid valve and the main valve is once opened by opening the pilot valve of the other solenoid valve. There is a high possibility that water flows into one of the solenoid valves, and the foreign matter biting into one of the solenoid valves is washed away.

  By the way, if foreign matter is caught in the other solenoid valve, the water stop failure is not eliminated even if the second water stop control is performed. Therefore, if the water stop failure is not solved after the second water stop control, the pilot valve of the one solenoid valve is opened once and then closed with the pilot valve of the other solenoid valve opened. It is desirable to perform a third water stop control that performs the valve at least once. Here, since there is a high possibility that foreign matter caught in one solenoid valve is washed away by the second water stop control as described above, the one solenoid valve is closed in advance by the third water stop control. By doing so, the possibility that the water stop failure will be eliminated is also increased.

Explanatory drawing which shows the structure of the dishwasher which comprises the water supply valve apparatus of embodiment of this invention. Sectional drawing of the water supply valve apparatus of embodiment. The flowchart which shows the control content at the time of the water stop of the water supply valve apparatus of embodiment.

  FIG. 1 shows a dishwasher. The dishwasher includes an outer case 1 and a cleaning tank 2 in the outer case 1, and water is supplied into the cleaning tank 2 through a water supply path 3. The washing tub 2 is provided with a tableware basket 2a on which the tableware W is placed, a washing nozzle 4 for injecting washing water toward the tableware basket 2a, and a heater 5.

  Further, a cleaning / drainage pump 6 connected to the bottom of the cleaning tank 2 via a leftover filter 2b is provided below the cleaning tank 1, and the water level in the cleaning tank 1 becomes a predetermined water level. A water level switch 7 is sometimes turned on. Here, when the washing / drainage pump 6 is rotated forward, the washing water is circulated in the washing tank 2 via the washing nozzle 4, and when the washing / drainage pump 6 is reversed, the washing water in the washing tank 2 is drained. It is drained through the path 8. The drainage channel 8 is provided with a reverse U-shaped rising portion 8a for preventing backflow, an air venting portion 8b, a drainage trap portion 8c, and a check valve 8d. In the exterior case 1, a drying fan 9 that blows drying air into the cleaning tank 2 is provided.

  When the operation switch of the dishwasher is turned on, water is first supplied to the washing tub 2 until the water level switch 7 is turned on, and detergent is mixed into this water from a detergent supply means (not shown) to generate washing water. Then, after the water supply is stopped, the heater 5 is energized and the cleaning / drainage pump 6 is rotated forward so that the cleaning water is sprayed from the cleaning nozzle 4 while being heated, and a cleaning operation for a predetermined time is performed. After completion of the cleaning operation, the cleaning / drainage pump 6 is reversed to drain the cleaning water in the cleaning tank 2, and then water is supplied to the cleaning tank 2 until the water level switch 7 is turned on. The water is sprayed from the washing nozzle 4 in the normal direction, and a rinsing operation for a predetermined time is performed. After completion of the rinsing operation, the cleaning / drainage pump 6 is reversed to drain the water in the cleaning tank 2, and then the heater 5 is energized and the drying fan 9 is driven to perform a drying operation for a predetermined time.

  Here, the water supply passage 3 is provided with a water supply valve device 10 for controlling water supply to the cleaning tank 2 before the cleaning operation and before the rinsing operation. Hereinafter, the water supply valve device 10 will be described in detail with reference to FIG.

The water supply valve device 10 includes a valve housing 11 having an inlet 111 connected to the upstream portion 3 a of the water supply path 3 and an outlet 112 connected to the downstream portion 3 b of the water supply path 3. Then, the valve housing 11, the upstream first and a solenoid valve 12 ₁ and the downstream side of the second solenoid valve 12 ₂ is disposed of, both the first and the second solenoid valves ₁₂ 1, 12 ₂ in the valve housing 11 Are connected in series via the communication path 113.

Each solenoid valve 12 ₁ , 12 ₂ includes a valve seat 121 formed integrally with the valve housing 11, a main valve 122 made of a diaphragm facing the valve seat 121 and opening and closing a main valve hole 122 a opened in the valve seat 121, An inflow chamber 123 formed so as to face the main valve 122 around the valve seat 121 and a cover 124 that also serves as a presser for the outer periphery of the diaphragm are defined on the back side of the main valve 122, and formed in the main valve 122 in the inflow chamber 123. A back pressure chamber 125 communicating through the orifice hole 123a, a pilot valve 126 for opening and closing the pilot valve hole 126a communicating the back pressure chamber 125 and the main valve hole 122a, and a solenoid 127 for driving the pilot valve 126 to open and close It consists of a pilot type solenoid valve consisting of The first solenoid valve 12 ₁ of the inflow chamber 123 and the main valve hole 122a is continuous with the respective inlet port 111 and the communication path 113, the second solenoid valve 12 ₂ of the inflow chamber 123 and the main valve hole 122a and the respective communicating passage 113 It leads to the outlet 112.

  The solenoid 127 includes an electromagnetic coil 127a, a movable iron core 127c housed in a cylindrical guide 127b integrated with a cover 124 inserted in the electromagnetic coil 127a, and a spring 127d that urges the movable iron core 127c forward in the axial direction. The pilot valve 126 is attached to the tip of the movable iron core 127c. And normally, when the pilot valve 126 is energized and held by the spring 127d at the closed position where the pilot valve hole 126a is closed, and when the electromagnetic coil 127a is energized, the movable iron core 127c is magnetically attracted in the axial direction. Is displaced to the valve opening position for opening the pilot valve hole 126a.

  When the pilot valve 126 is closed, the water flowing into the back pressure chamber 125 from the inflow chamber 123 through the orifice hole 123a is enclosed in the back pressure chamber 125, and the water pressure in the back pressure chamber 125 is equal to the water pressure in the inflow chamber 123. Become. Here, the pressing force acting on the front surface of the main valve 122 is a resultant force of the pressing force due to the water pressure in the inflow chamber 123 and the pressing force due to the water pressure in the main valve hole 122 a, but the water pressure in the main valve hole 122 a is the inflow chamber 123. Since the pressure of the back pressure chamber 125 acting on the back surface of the main valve 122 exceeds the pressure acting on the front surface of the main valve 122, the main valve 122 is closed. Further, when the pilot valve 126 is opened, the water in the back pressure chamber 125 flows out to the main valve hole 122a through the pilot valve hole 126a, and the water pressure in the back pressure chamber 125 is reduced. The pressing force due to the water pressure of the acting back pressure chamber 125 is lower than the pressing force acting on the front surface of the main valve 122, the main valve 122 is opened, and water flows from the inflow chamber 123 to the main valve hole 122a.

When water stop to stop water supply to the washing tank 2, the control means serving controller 13 provided in the dishwasher, the first solenoid valve 12 ₁ and one solenoid valve and the second solenoid valve 12 _2, for example, the the first pilot valve 126 of the solenoid valve 12 ₁ were allowed to close the valve to stop the energization of the first solenoid valve 12 ₁ of the electromagnetic coil 127a, and stops energizing the second solenoid valve 12 ₂ electromagnetic coil 127a the second pilot valve 126 of the solenoid valve 12 ₂ performs control to closed. With such prior to thereby close the first pilot valve 126 of the solenoid valve 12 _1, the second solenoid valve 12 ₂ on the downstream side in the closing of the first solenoid valve 12 ₁ of the main valve 122 supply pressure no longer applied, the pressure of the second solenoid valve 12 ₂ of the inflow chamber 123 and the main valve hole 122a becomes atmospheric pressure, the pressure in the back pressure chamber 125 becomes the atmospheric pressure. Therefore, even by closing the second solenoid valve 12 ₂ of the pilot valve 126, a difference between the pressing force acting on the front surface of the pressing force and the main valve 122 which acts on the rear surface of the second solenoid valve 12 ₂ of the main valve 122 pressure is not generated, it is no longer possible to the second solenoid valve 12 ₂ of the main valve 122 is fully closed.

And when it is closed preceded the second solenoid valve 12 ₂ of the pilot valve 126 and the valve closing the first solenoid valve 12 ₁ of the second solenoid valve 12 ₂ of the main valve 122 stops the water flow, the pressure of 1 solenoid valve 12 ₁ inflow chamber 123 and the main valve hole 122a becomes water primary pressure, pressure in the back pressure chamber 125 becomes the feed water primary pressure. Therefore, even by closing the first pilot valve 126 of the solenoid valve 12 _1, a difference between the pressing force acting on the front surface of the pressing force and the main valve 122 which acts on the rear surface of the first solenoid valve 12 ₁ of the main valve 122 pressure is not generated, it is no longer possible to the first solenoid valve 12 ₁ of the main valve 122 is fully closed. Even if one of the solenoid valves to be closed in advance has a slight leakage due to the foreign matter caught between the main valve 122 and the valve seat 121, the other solenoid valve generates almost no differential pressure. Does not close completely, resulting in poor water stoppage.

  Therefore, in the present embodiment, the control shown in FIG. 3 is performed by the controller 13 when the water level switch 7 is turned off when the water level switch 7 is turned on by water supply before the start of the rinsing operation. Hereinafter, this point will be described.

When the water level switch 7 is turned on (STEP1), first solenoid valve 12 ₁ and one solenoid valve and the second solenoid valve 12 _2, for example, the first pilot valve 126 of the solenoid valve 12 ₁ were allowed to closed second performing first water stop control to close the pilot valve 126 of the solenoid valve 12 ₂ (STEP2,3). Thereafter, a rinsing operation for a predetermined time is performed (STEP 4). After the rinsing operation is completed, the cleaning / drainage pump 6 is reversed to drain the water in the cleaning tank 2 (STEP 5), and then a drying operation for a predetermined time is performed. (STEP6).

Here, the results of the first first water cutoff by biting of foreign matter in the solenoid valve 12 ₁ which is closed in advance upon waterproofing control failure, gradually increase the water level in the washing tank 2 after draining in STEP5 To do. And then when the water level switch 7 is turned on (STEP7), with reversing the cleaning and drainage pump 6 starts draining (STEP 8), to open the first pilot valve 126 of the solenoid valve 12 ₁ (STEP 9 ), a predetermined number of times that is closed after temporarily opening the second pilot valve 126 of the solenoid valve 12 ₂ in this state (e.g., for 3 times) the second water-stopping control (STEP 10), then, the first pilot valve 126 of the solenoid valve 12 ₁ causes closed (STEP 11), to stop the drainage (STEP 12). Note that when the second water-stopping control, the second solenoid valve 12 ₂ of the pilot valve 126 a predetermined time (e.g., 1 second) were allowed to open a predetermined time (e.g., 1 second) repeatedly be closed, Finally, the pilot valve 126 is kept closed.

In the second water stop control, in order to close the second electromagnetic valve 12 _second pilot 126 in a state of being open the main valve 122 in the opening of the first solenoid valve 12 ₁ of the pilot valve 126, the second As long as the pressing force acting on the back of the solenoid valve 12 ₂ of the main valve 122 exceeds the pressure force acting on the front surface of the main valve 122, no biting of foreign matter in the second solenoid valve 12 _2, the second solenoid valve 12 ₂ of the main valve 122 is securely closed, the water stopping failure is eliminated. Further, in the second water stop control, the main valve in the opening of the second solenoid valve 12 ₂ of the pilot valve 126 causes opens the main valve 122 in the opening of the first solenoid valve 12 ₁ of the pilot valve 126 for once to open the 122, water flows through the first solenoid valve 12 _1, likely to be washed out foreign substances biting between the first main valve 122 and the valve seat 121 of the solenoid valve 12 ₁ is high.

Meanwhile, when result in jamming of foreign matter in the second solenoid valve 12 _2, after the second water-stopping control is also not eliminated water stopping poor level of cleaning tank 2 is gradually increased after drainage stopped in STEP 12. And then when the water level switch 7 is turned on (STEP 13), with reversing the cleaning and drainage pump 6 starts draining (STEP 14), thereby opening the second pilot valve 126 of the solenoid valve 12 ₂ (STEP 15 ), a predetermined number of times that is closed from once to open the first pilot valve 126 of the solenoid valve 12 ₁ in this state (e.g., for 3 times) third stop water control (STEP 16), then, the second pilot valve 126 of the solenoid valve 12 ₂ causes closed (STEP 17), to stop the drainage (STEP 18).

Here, foreign matter caught in the first solenoid valve 12 ₁ for likely to be washed away by the water stop control of the second as described above is high, the third of the first preceding the solenoid valve 12 ₁ in the water stop control By closing the valve, there is a high possibility that the water stop failure will be resolved. If the water stop failure is not resolved even after the third water stop control and the water level switch 7 is turned on again after stopping the drainage at STEP 18 (STEP 19), the drainage is resumed (STEP 20) and the service person checks it. An error display for prompting is displayed (STEP 21).

As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, when the water stop failure is not solved even after the second water stop control, an error display may be performed without performing the third water stop control, and the second time after the third water stop control. It is also possible to perform the same control as the water stop control. In the above embodiment, when the second water stop control has been the opening and closing of the second solenoid valve 12 ₂ of the pilot valve 126 to repeat a predetermined number of times, to close after temporarily opening the pilot valve 126 This may be done only once. The same applies to the third water stop control.

Also, may be closed to first water stop control by the second solenoid valve 12 ₂ of the pilot valve 126 pilot valve 126 of the first solenoid valve 12 ₁ were allowed to close the. In this case, when the second water stop control, thereby closing after temporarily opening the first solenoid valve 12 ₁ of the pilot valve 126 in a state in which opening the second solenoid valve 12 ₂ of the pilot valve 126 performed at least once, when the water stop control of the third, closed after temporarily opening the second pilot valve 126 of the solenoid valve 12 ₂ in a state in which opening the first solenoid valve 12 ₁ of the pilot valve 126 At least once.

  The present invention can be widely applied not only to the water supply valve device 10 of the above-described embodiment provided in the water supply channel 3 of the dishwasher but also as a water supply valve device provided to the water supply channel of a device using water such as a washing machine.

3 ... water supply passage, 10 ... feed water valve device, 12 1 _... first electromagnetic valve, 12 2 _... second electromagnetic valve, 121 ... valve seat, 122 ... main valve, 122a ... Omoben'ana, 123 ... inlet chamber, 123a ... Orifice hole, 125 ... back pressure chamber, 126 ... pilot valve, 126a ... pilot valve hole, 127 ... solenoid.

Claims (2)

A water supply valve device provided in a water supply channel of a device that uses water, comprising an upstream first electromagnetic valve and a downstream second electromagnetic valve connected in series, and the first and second Control means for controlling both solenoid valves, the first and second solenoid valves are defined on the back side of the main valve, a main valve comprising a diaphragm for opening and closing the main valve hole opened in the valve seat, A back pressure chamber communicating with an inflow chamber formed around the valve seat via an orifice hole, a pilot valve for opening and closing a pilot valve hole communicating with the back pressure chamber and the main valve hole, and a solenoid for driving the pilot valve to open and close Comprising a pilot type solenoid valve comprising:
The control means executes the first water stop control for closing the pilot valve of one of the first solenoid valve and the second solenoid valve and then closing the pilot valve of the other solenoid valve when the water stops. If a water stop failure occurs, the pilot valve of the other solenoid valve is opened once and then closed at least once with the pilot valve of the one solenoid valve opened. A water supply valve device configured to execute a second water stop control for closing the pilot valve of the one solenoid valve after the pilot valve of the other solenoid valve is closed . When the water stop failure is not solved even after the second water stop control, the control means opens the pilot valve of the one solenoid valve in a state where the pilot valve of the other solenoid valve is opened. is allowed have at least one line to be closed after, configured to execute the third water stop control to close the pilot valve of the other of the solenoid valve after the closing of the pilot valve of the one solenoid valve The water supply valve device according to claim 1, wherein:

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