JP5870856B2 - Electrically driven valve - Google Patents

Description

  The present invention relates to an electrically driven valve that blocks a fluid flow in response to an electrical signal. In particular, the present invention is applied to an electrically driven valve in a piping path in which a check valve is installed on the upstream side.

  Conventionally, a check valve has been provided in the water supply line, and if a high pressure phenomenon (water hammer or water hammer) accompanying the shutoff of the valve body occurs downstream of this check valve, the valve body that caused the high pressure phenomenon will be damaged. give. In addition, not only the valve body causing the high pressure phenomenon, but also another valve body connected by piping acts on the valve body, which adversely affects the durability of the valve body. Such pressure is given and referred to as pressure.

  The water supply apparatus described in Patent Document 1 provides a water supply apparatus that can prevent an operation failure of an electric drive valve due to stiff pressure. For this purpose, in a water supply apparatus comprising an electric drive valve, a primary water channel upstream of the electric drive valve, and a secondary water channel downstream of the electric drive valve, the primary water channel A relief valve is provided for releasing the pressure in the primary side water channel to the secondary side water channel when the water pressure in the inside becomes a predetermined pressure or more.

JP-A-8-178125

  According to the technique disclosed in Patent Document 1, an excessive water pressure can be released by the relief valve, but a mechanical mechanism such as a relief valve needs to be added. In addition, it is conceivable to take mechanical water hammer countermeasures on the piping route, but this choice is mainly left to the water supply equipment contractor, and it is possible that the request from the equipment side having an electrically driven valve is not accepted. . Therefore, a configuration capable of taking measures against high pressure generated by itself with a simple configuration in an electrically driven valve that opens and closes the valve body by an electrical signal is desired.

  The present invention has been made paying attention to such problems existing in the prior art, and in an electrically driven valve provided in a pipe through which a fluid flows, the valve body is caused by a high pressure generated when the valve body is shut off. An object of the present invention is to provide an electrically driven valve that does not adversely affect the operation.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

In order to achieve the above object, the present invention employs the following technical means. That is, according to the first aspect of the present invention, there is provided an electrically driven valve (1) attached to a pipe (7) through which a fluid flows, and a valve body (1a, 27) that is opened and closed in accordance with an electrical signal, A control device (23) for controlling the opening and closing of the main body (1a, 27), an electric signal is supplied to the control device (23), and the valve main body (1a, 27) is supplied via the control device (23) according to the electric signal. The control device (23) opens and closes the valve body (1a, 27) in response to an electrical signal from the electrical signal input section (20), and drives the valve body (1a). , 27) and a flow rate control means (S402, S404) for controlling the flow rate of the fluid passing through the valve body (1a, 27), and a predetermined pressure relief valve opening time (t5) Only the valve body (1a, 27) is concerned with the presence or absence of electrical signal Without Bei example a pressure vent means (S407～S409) to reduce the pressure of the accumulated fluid on the upstream side of the opening and valve body (1a, 27), the control unit (23), flow control means (S402, After shutting off the flow of the fluid flowing through the valve body (1a, 27) by S404), after a preset waiting time (t4) has elapsed, the pressure relief means (S407 to S409) causes the valve body (1a, 27) to The pressure of the fluid accumulated on the upstream side is reduced, the upstream side of the valve body (1a, 27) communicates with another valve body (2a) through the fluid, and the control device (23) includes pressure release means. After the valve body (1a, 27) is closed by (S407 to S409) and after a predetermined elapsed time (t6) longer than the standby time (t4), the pressure relief means (S407 to S409) Valve body (1a, 7) is opened regardless of the presence or absence of an electrical signal from the electrical signal input section (20), and the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27) is released by the pressure relief means (S407 to S409). It is characterized by mitigation.

  According to this invention, after the flow of the fluid flowing through the valve body (1a, 27) is interrupted, the valve body (1a, 27) is connected to the presence or absence of an electrical signal for a predetermined pressure release valve opening time (t5). Since it is provided with pressure relief means (S407 to S409) for reducing the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27) without any trouble, abnormalities accompanying the shutoff of the valve body (1a, 27) are provided. It is possible to provide an electrically driven valve (1) that does not adversely affect the valve body (1a, 27) at a high pressure.

  In addition, the code | symbol in parentheses described in a claim and each said means is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a piping system diagram of an automatic faucet in which an electrically driven valve constituting the first embodiment of the present invention is used. It is a time chart for demonstrating the cloud pressure which can generate | occur | produce in the piping system | strain shown in FIG. 1, and the change of a pressure is shown by taking pressure on a vertical axis | shaft and elapsed time on a horizontal axis | shaft. It is a block block diagram which shows the structure of the automatic water tap which comprises the electric drive valve shown in FIG. 4 is a flowchart for explaining control by a control circuit shown in FIG. 3. It is a time chart of control by the flowchart of FIG. It is a flowchart for demonstrating the control in the control circuit in 2nd Embodiment of this invention. It is a flowchart for demonstrating the control in the control circuit in 3rd Embodiment of this invention.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. A first automatic faucet 1 and a second automatic faucet 2 that are electrically driven valves are provided in the water pipe system of the automatic faucet shown in FIG. 1, and an electric water heater 4 is provided upstream of these automatic faucets 1 and 2. A check valve 3 for protection is installed. In the pipe 7, an electric water heater 4 is provided on the upstream side of the check valve 3. This electric water heater 4 is used for warming water for hand washing.

  Further, a check valve 5 for preventing a reverse flow is provided on the upstream side of the electric water heater 4 to form another check valve for preventing the hot water forming the fluid in the electric water heater 4 from returning to the upstream side. ing. Note that a relief valve of 2.5 MPa is used for these check valves 3 and 5.

  Here, the purpose of installing the check valve 3 is to prevent the electric water heater 4 from being damaged by the water hammer generated by the automatic faucets 1 and 2 (referred to as water hammer W / H). The purpose of installing another check valve 5 is to prevent hot water from flowing back to the primary pipe side as described above.

  In this piping system, as shown in FIG. 2, in order to use the automatic faucet 1, when the electromagnetic valve 1 a in the automatic faucet 1 is opened and water flows from the automatic faucet 1, the pressure is increased. descend. When the automatic faucet 1 is closed after use, the flow stops suddenly, so that the water pressure instantaneously increases (water hammer W / H) due to the inertia of the water.

  If the check valve 3 or 5 is not installed, this inertial force is transmitted to the upstream side and absorbed by the entire piping system, and the primary side of the automatic faucet 1 immediately returns to the steady pressure, but the check valve 3 or 5 Is installed, the generated rising pressure is hindered by the check valve 3 or 5, so that the pressure is not released to the primary pipe 6 side, and it is trapped between the automatic faucet 1 and the check valve 3 or 5. Held as pressure.

  In addition, even if the automatic faucet 1 constituting the valve body is not used, a water hammer (called water hammer) generated by using the automatic faucet 2 (or manual valve) constituting another valve body is added. In some cases, these rising water pressures are also held by the check valve 3 or 5 as a cloud pressure. Note that the pressure decreases in the order of the pipes 7, 9, 10, and 6 in FIG.

  Such a bulging pressure is always applied until the automatic faucet 1 or 2 is reused, and its value is a value within the range of the yield pressure of the check valve 3 or 5, for example, a maximum of 2.5 MPa. Become. The maximum pressure of 2.5 MPa means that the water pressure in the secondary pipe 7 at the time of steady state is 0.1 to 0.2 MPa, and thus a high pressure 10 to 20 times that at the time of steady state is applied. Incidentally, the maximum water pressure in the primary pipe 6 is about 0.75 MPa as shown in FIG.

  When such a bulging pressure is repeatedly applied to the electromagnetic valves 1a and 2a in the automatic faucets 1 and 2 for a long time, the life of the electromagnetic valves 1a and 2a may be shortened. In addition, faucets 1b and 2b are provided at the tip of the solenoid valves 1a and 2a, and the solenoid valves 1a and 2a are pilot solenoid valves whose valve opening and closing are controlled by the respective controllers 1c and 2c. When the valve opening pulse voltage is applied from the controllers 1c and 2c, the valve is opened. After that, even if the energization is cut off, the controller 1c, 2c includes a latch type electromagnetic valve that holds the valve open state until the valve closing pulse voltage is applied. The solenoid valve 1a forms a valve body referred to in the present invention.

  The automatic faucet block configuration of FIG. 3 is applied to both the automatic faucet 1 and the automatic faucet 2 of FIG. Therefore, in FIG. 3, the solenoid valve 1 a (solenoid valve 2 a) constituting the valve body of FIG. Further, the controller 1c in FIG. 1 is shown as a controller 22 in FIG.

  In FIG. 3, a power supply circuit 21 converts AC100V input from the outside into DC5V, and supplies power necessary for operating each circuit unit in the controller 22 to each circuit unit.

  The control circuit 23 is a circuit using a microcomputer that constitutes the control device of the present invention, and controls the operation of the automatic faucet 1 as a whole. The light emitting circuit 24 projects light for proximity sensor in accordance with a command signal from the control circuit 23 in order to detect whether or not a detection target (such as a finger) is nearby.

  The light receiving circuit 25 detects blocking or reflection of light such as infrared rays by the detection target. For example, when a reflected light is received and the amount of the received light is equal to or greater than a threshold value, a detection signal indicating the presence of a detection target is output to the control circuit 23. The light emitting circuit 24 and the light receiving circuit 25 form an electric signal input unit 20. The electromagnetic valve drive circuit 26 outputs a drive signal (pulse voltage) for opening or closing the electromagnetic valve 27 to the electromagnetic coil 27 c of the electromagnetic valve 27 in accordance with a command signal from the control circuit 23. .

  The pressure release selection switch 28 is a switch for selecting whether or not to perform a pressure release operation. For example, when the check valve 3 or 5 is installed upstream of the pipe 7 in FIG. 1, the pressure release selection switch 28 may be used because there is a possibility that stuffing pressure may be generated. Turn ON to release the pressure and release the bulk pressure.

  On the other hand, when the check valve 3 or 5 is not installed upstream, the pressure release selection switch 28 is turned OFF so that the pressure release operation is not performed because there is no possibility that a stuffing pressure is generated. Even if the pressure release selection switch 28 is turned on when the check valve 3 or 5 is not installed on the upstream side, there is no problem in operation. However, since excessive energy for pressure release operation is consumed, it is preferable in terms of energy saving. Absent.

  In FIG. 3, when there is an object to be detected (such as a finger), a valve opening signal based on a command signal from the control circuit 23 is output, so the electromagnetic valve 27, that is, the electromagnetic wave of FIG. The valve 1a is opened and water flows out from the faucet 1b of the automatic faucet 1 in FIG.

  At the same time, the water pressure in the pipe 7 between the check valve 3 and the electromagnetic valve 1a in FIG. 1 decreases when the electromagnetic valve 1a is opened. Then, as long as there is an object to be detected, the water discharge continues, and the water pressure in the pipe 7 (water discharge pressure) also continues. The period of water discharge (the fluid flow time t2 of the valve body 1a) is generally about 10 seconds.

  Next, when there is no object to be detected, a valve closing signal based on a command signal from the control circuit 23 is output to the electromagnetic valve driving circuit 26, whereby the electromagnetic valve 1a (27) is closed. Therefore, a water hammer (W / H) is generated, and the water pressure in the pipe 7 between the check valve 3 and the electromagnetic valve 1a (27) rises at a stretch.

  Furthermore, since there is the check valve 3 or 5 on the upstream side of the electromagnetic valve 1a (27), the pressure once increased is not released to the upstream side, but is held as a stuffing pressure. Therefore, the pressure release operation shown below is performed after a short waiting time t4 has elapsed after the valve is closed.

  That is, the solenoid valve 1a (27) is opened from the control circuit 23 via the solenoid valve drive circuit 26 for a short time (pressure release valve opening time t5), and the retained pressure is released, and then a large flow of water flows. Before (t5 seconds after opening), the valve is automatically closed again.

  When the valve is closed, since the valve is opened for a short time (pressure release valve opening time t5) and a large amount of water is not flowing, there is almost no inertial force due to water. / H) is rarely generated, and therefore, no bulge pressure is generated after the valve is closed.

  However, a water hammer (W / H) is generated by using another valve body 2a (electromagnetic valve 2a constituting the valve body of the automatic faucet 2 in FIG. 1) connected to the pipe 7 thereafter. Again, there is a case where the water pressure in the pipe 7 is maintained at a large volume pressure. On the other hand, since the same pressure release operation (short-time solenoid valve opening) is repeated every predetermined elapsed time t6 after the pressure release operation is finished, the overpressure is maintained over a long period of time. 7 is not retained. Therefore, it is possible to prevent the life of the electromagnetic valves 1a and 2a of the automatic faucets 1 and 2 from being shortened.

  Hereinafter, the operation of the first embodiment will be described with reference to FIGS. 4 and 5.

  In FIG. 4, when control is started, it is determined in step S401 whether or not there is a detection target (detected object such as a finger). If there is an object to be detected (detected object), the process proceeds to step S402, and a valve opening signal based on a command signal from the control circuit 23 is output, so the electromagnetic valve 27 (the electromagnetic valve in FIG. 5 is applied to the electromagnetic coil 27c of the valve 1a), the electromagnetic valve 1a (27) is opened, and water flows out from the faucet 1b of the automatic faucet 1 of FIG.

  Accordingly, as shown in FIG. 5, the valve drive is opened, and the water discharge operation is water discharge. At the same time, the water pressure in the pipe 7 between the check valve 3 and the electromagnetic valve 1a shown in FIG. 5 decreases from the steady water pressure to the water discharge pressure when the electromagnetic valve 1a is opened. Then, as long as there is an object to be detected, the water discharge continues, and the water pressure in the pipe 7 (water discharge pressure) also continues.

  Next, when there is no object to be detected in step S403 in FIG. 4, the process proceeds to step S404, and a valve closing signal (command) based on the command signal from the control circuit 23 is output to the electromagnetic valve drive circuit 26, and the electromagnetic valve When the pulse voltage Pc for valve closing is output from the drive circuit 26, the electromagnetic valve 1a (27) is closed, and the valve driving in FIG. 5 is closed. This water stop generates a water hammer (W / H), and the water pressure in the pipe 7 between the check valve 3 and the electromagnetic valve 1a (27) rises at a stretch.

  Since there is the check valve 3 or 5 as described above, the pressure once increased is not released upstream, and is maintained as a stuffing pressure. Therefore, if the pressure release selection switch 28 (FIG. 3) is turned on in step S405 of FIG. 4, after proceeding to step S406, the process waits for a slight waiting time t4 after the valve is closed. Proceeding to S407, a short time (time t1 in FIG. 5) pulse voltage Po is again applied to the solenoid valve 1a (27) to open the valve for a short time to perform the pressure release operation.

  Thereafter, the process proceeds to step S408, and after the elapse of the pressure release valve opening time t5, the valve closing pulse voltage Pc is again applied to the electromagnetic coil 27c of the electromagnetic valve 1a (27) again for a short time (time t3 in FIG. 5). ) Applied to close the solenoid valve 1a (27) serving as the valve body.

  In this way, the process proceeds to step S408, and after the retained pressure is released, before the large flow of water flows (after the valve opening time t5 seconds after the valve is opened), the electromagnetic valve is automatically re-opened in step S409. The valve closing operation is performed by applying a pulse voltage Pc for valve closing at time t3 at 1a (27). The pressure relief valve opening time t5 is 0.1 seconds in this embodiment.

  When the valve is closed, since the valve is opened for a short time and a large amount of water is not flowing, there is almost no inertial force due to water, so that water hammer (W / H) is generated even when the valve is closed. There is almost no, therefore, a bulging pressure is not generated after the valve is closed, and a steady pressure is obtained.

  However, after this, the valve body of another automatic faucet connected to the pipe 7 (the electromagnetic valve 2a of the automatic faucet 2 in FIG. 1) is used, and the water hammer ( W / H) occurs, and again, the water pressure in the pipe 7 may be maintained at a large volume pressure.

  A countermeasure for this will be described below. After the solenoid valve closing operation in step S409, the process proceeds to step S410, the timer for counting the elapsed time t6 (referred to as T6 timer) is cleared, and the process returns to step S401. In this case, even if there is no object to be detected in step S401, if the pressure release selection switch 28 is ON in step S411, the process further proceeds to step S412 and waits for the elapsed time t6 in the T6 timer. Proceed to step S406.

  In step S406, after a short waiting time t4 has elapsed, the process proceeds to step S407, where a short-time (t1) valve-opening pulse voltage Po is applied to the solenoid valve 1a (27), and the solenoid valve 1a ( 27) is opened and the pressure release operation is performed.

  As a result, as shown in FIG. 5, even if the bulging pressure is generated by the water hammer W / H, the pressure release operation is automatically performed after the elapsed time t6 has elapsed, and the normal water pressure is restored. The pressure release operation after the elapsed time t6 has elapsed is performed with the same time schedule (t1, t5, t3) as the pressure release operation after the valve operation accompanied by the water discharge operation in the automatic faucet 1.

  As described above, after the pressure release operation after the water discharge operation is completed, the same pressure release operation (short-time solenoid valve opening) is repeated every elapsed time t6, so that the overpressure is maintained over a long period of time. It is not held in one pipe 7. Therefore, it is possible to prevent the life of the electromagnetic valves 1a and 2a in the automatic faucets 1 and 2 from being shortened.

  In step S412, when the elapsed time t6 has not reached the elapsed time t6, the process proceeds to step S413 and continues counting up with the T6 timer. Further, when the check valve 3 or 5 shown in FIG. 1 is not installed upstream of the automatic water taps 1 and 2, there is no possibility that a stuffing pressure is generated, so that it is not necessary to perform a pressure release operation. In this case, the pressure release selection switch 28 in FIG. 3 is not turned ON, and NO is determined in steps S405 and S411, and the pressure release operation is not performed.

  As described above, the pressure release selection switch 28 is turned ON / OFF by a pipe construction contractor or the like, and in the piping system, the pressure release operation can be switched to the case where the pressure release operation is not performed. That is, if the pressure release selection switch 28 is turned off in step 405, the pressure release operation is not performed and the process returns to the start point. If the pressure release selection switch 28 is turned off in step S411, an automatic pressure release operation is performed every elapsed time t6. Instead, it returns to the starting point.

  In the first embodiment, the water discharge time (fluid flow time in the valve bodies 1a, 27) t2 is normally about 10 seconds during the hand washing period. The waiting time t4 is set to about several seconds. Further, the pressure release valve opening time t5 is set to 0.1 second, and the elapsed time t6 is set to about 1 hour.

(Operation of the first embodiment)
The operation of the first embodiment will be collectively described below. In the said 1st Embodiment, it has the electric drive valve 1 attached to the piping 7 through which the fluid flows. The electrically driven valve 1 supplies electrically signals to the valve bodies 1a and 27 that are electrically opened and closed, a control device (control circuit) 23 that controls the opening and closing of the valve bodies 1a and 27, and the control device 23. And an electric signal input unit 20 that drives the valve bodies 1a and 27 via the control device 23 in accordance with the electric signal.

  The control device 23 includes flow rate control means S402 and S404 that open and close the valve bodies 1a and 27 in accordance with an electrical signal from the electrical signal input unit 20 and control the flow rate of the fluid passing through the valve bodies 1a and 27.

  Further, the control device 23 shuts off the flow of the fluid flowing through the valve bodies 1a and 27, and then opens the valve bodies 1a and 27 for a predetermined pressure release valve opening time t5 regardless of the presence or absence of an electrical signal. Pressure relief means S407 to S409 for reducing the pressure of the fluid accumulated on the upstream side of the main bodies 1a and 27 are provided.

  According to this, after shutting off the flow of the fluid flowing through the valve bodies 1a and 27, the valve bodies 1a and 27 are opened regardless of the presence or absence of an electrical signal for a predetermined pressure release valve opening time t5. Since the pressure relief means S407 to S409 for reducing the pressure of the fluid accumulated on the upstream side of 1a, 27 are provided, the valve bodies 1a, 27 may be adversely affected by the abnormal high pressure accompanying the shutoff of the valve bodies 1a, 27. A small number of electrically driven valves 1 can be provided.

  Further, the pipe 7 has a check valve 3 or 5 on the upstream side of the valve bodies 1 a and 27. According to this, the first embodiment is particularly useful in “a piping system or the like having the check valve 3 or 5 upstream of the valve bodies 1 a and 27” in which abnormal pressure is easily accumulated.

  Further, after the flow of the fluid flowing through the valve bodies 1a and 27 is interrupted by the flow rate control means S402 and S404, after the preset waiting time t4 has elapsed, the pressure relief means S407 to S409 are used to upstream the valve bodies 1a and 27. Reduce the pressure of fluid accumulated in the.

  According to this, it is possible to reduce the pressure of the fluid that has risen due to the interruption of the flow of the fluid flowing through the valve bodies 1a and 27 by the operation of the pressure release means S407 to S409.

  In addition, the valve body (1a, 27) is opened for a preset pressure release valve opening time (t5) shorter than the time when the fluid flows by the flow rate control means (S402, S404), and the valve body (1a, 27) is opened. ) And the check valve.

  According to this, since the valve bodies 1a and 27 are opened for the pressure release valve opening time t5 to reduce the pressure of the fluid accumulated on the upstream side of the valve bodies 1a and 27, the valve opening time is too long. Without being too short, it is possible to perform the necessary pressure relief while restricting the flow of fluid accompanying the valve opening.

  Next, the upstream side of the valve bodies 1a, 27 communicates with another valve body 2a through the fluid. In this case, after the valve bodies 1a and 27 are closed by the pressure release means S407 to S409 and after a predetermined elapsed time t6 longer than the standby time t4 has elapsed, the pressure release means S407 to S409 are replaced by the valve body 1a, 27 is opened regardless of the presence or absence of an electrical signal from the electrical signal input unit 20, and the pressure of the fluid accumulated on the upstream side of the valve bodies 1a and 27 is reduced by the pressure relief means S407 to S409.

  According to this, even when the upstream side of the valve bodies 1a, 27 communicates with another valve body 2a through the fluid and the pipe body 1a, 27 does not block the flow, Even in such a case, the pressure relief means S407 to S409 are operated by the valve body 1a, 27 after the elapse of a predetermined time t6 longer than the standby time t4. Is opened regardless of the presence or absence of an electrical signal from the electrical signal input unit 20 to reduce the pressure of the fluid accumulated on the upstream side of the valve bodies 1a and 27, so that a high pressure remains in the valve bodies 1a and 27 for a long time. Will not remain.

  In addition, the operation of reducing the pressure of the fluid accumulated on the upstream side of the valve bodies 1a and 27 by selectively opening the valves by the pressure release means S407 to S409 regardless of the presence or absence of an electric signal from the electric signal input unit 20 is selectively performed. There is provided a pressure release selection switch 28 which is disabled.

  According to this, when pressure relief is unnecessary or there is another harmful effect due to pressure relief due to the particularity of the piping system or the like, the operation of reducing the fluid pressure by the pressure relief means S407 to S409 is performed by operating the pressure release selection switch 28. Can be prevented.

  Further, the valve bodies 1a and 27 are constituted by a main valve of a pilot type electromagnetic valve. In steps S402 and S404 or steps S407 and S409, application of the valve-opening pulse voltage Po (time is t1) and the valve-closing pulse voltage Pc (time is t3) to the electromagnetic coil 27c of the pilot solenoid valve. Is commanded to the solenoid valve drive circuit 26. Therefore, since the valve opening and closing operation is performed only by applying the pulse voltage, power saving can be achieved even if the frequency of opening and closing increases as the pressure is released.

  In addition, the electric signal input unit 20 automatically detects the necessity of passage of fluid through the valve bodies 1a and 27 and supplies an electric signal. The valve bodies 1a and 27 constitute automatic valve bodies 1a and 27 controlled by electric signals. Therefore, it is possible to exert an effect of automatically releasing pressure in a piping system including an automatic valve in which the valve bodies 1a and 27 are automatically opened and closed.

  Next, the pressure relief valve opening time t5 of the valve bodies 1a and 27 by the pressure relief means S407 to S409 is 2 seconds or less, for example, 0.1 seconds. Therefore, the amount of fluid leakage due to the operation of the pressure release means S407 to S409 can be suppressed to an unnoticeable level.

  The check valve 3 or 5 includes the check valve 3 or 5 provided on the downstream side of the electric water heater 4 provided on the upstream side of the valve bodies 1 a and 27 or on the upstream side of the electric water heater 4. Therefore, the life of the electrically driven valve 1 used for the pipe 7 provided with the check valve 3 or 5 on the upstream side or the downstream side for the electric water heater can be extended.

  Further, the electric signal input unit 20 generates an electric signal by blocking or reflecting light such as infrared rays, and the valve bodies 1a and 27 are constituted by electromagnetic valves of automatic faucets. And the electric water heater 4 which raises the temperature of the water used as the fluid which flows through the faucet of an automatic water faucet to make hot water in the upstream of a solenoid valve is provided. In addition, a protective check valve 3 for protecting the electric water heater 4 is provided between the electric water heater 4 and the valve bodies 1 a and 27, and the back flow of hot water is prevented upstream of the electric water heater 4. A check valve 5 for preventing backflow is provided.

  According to this, durability of the solenoid valve 1a (27) which comprises the valve main body in the automatic faucet equipped in the washroom etc. can be improved. In particular, an automatic faucet that is not frequently used and that produces hot water from the electric water heater 4 is also provided with a check valve, so that it is easy to be exposed to a heavy pressure for a long time. Without any additional parts, it is possible to reduce the bulk pressure.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. As shown in FIG. 6, in the second embodiment, the pressure release selection switch is omitted. In steps S401b and 403b, the necessity of water supply by an automatic valve is determined. This includes not only the proximity sensor that detects the presence of the detection target as in the first embodiment but also the presence or absence of a signal from the water level sensor and the operation of a manual switch.

  That is, this necessity is given automatically or manually from other control means of a system (a factory piping system or specific equipment) provided with the electrically driven valve 1a (27) forming an automatic valve. According to this, when the valve is closed after water supply, an automatic pressure release operation is always performed. In addition, the pressure release operation is always performed after the elapsed time t6.

(Third embodiment)
Next, a third embodiment of the present invention will be described. Features different from the above-described embodiment will be described. As shown in FIG. 7, the third embodiment performs the automatic pressure release operation in steps S406 to S409 only after the automatic water supply valve supplies water with a signal from the electrical signal input unit 20 (FIG. 3) and closes the valve. The automatic pressure release operation is not performed every elapsed time (t6) of the first and second embodiments, and the electricity used for the piping system having no branch piping between the check valve 3 and the valve body 1a (27). Applicable to mechanically driven valves.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. For example, in the first embodiment described above, it is used for a water supply system, but may be used for a drainage system. The fluid is not limited to water, but may be other liquid or gas such as vapor. Can be used in applications where high pressure is generated when the valve body is shut off.

  For example, the present invention can be applied to a fully automatic washing machine, a dishwasher, an electrically driven valve in a factory, and the like in addition to an automatic faucet in a washroom as in the above embodiment. Further, the other valve body that generates the stylus need not be an electrically driven valve, and may be a manual valve.

  In addition, both the check valve 3 and the check valve 5 need not be used, and the present invention is applied to a piping system or the like in which either the check valve 3 or the check valve 5 is used. Can do. Furthermore, the electrically driven valve means a valve provided with means for electrically driving the valve, which includes special means such as an electromagnet, an electric motor, and a piezoelectric element.

20 Electric signal input unit S402, S404 Flow rate control means S407-S409 Pressure release means t4 Standby time t5 Pressure release valve opening time t6 Elapsed time t2 Fluid flow time of the valve body (water discharge time)
5 Check valve for preventing backflow 3 Check valve for protection to protect electric water heater

Claims (10)

An electrically driven valve (1) attached to a pipe (7) through which fluid flows,
A valve body (1a, 27) that is opened and closed in accordance with an electrical signal;
A control device (23) for controlling the opening and closing of the valve body (1a, 27);
An electric signal input unit (20) for supplying an electric signal to the control device (23) and driving the valve body (1a, 27) via the control device (23) according to the electric signal. ,
The control device (23)
A flow rate control means (S402) that opens and closes the valve body (1a, 27) according to the electrical signal from the electrical signal input unit (20) and controls the flow rate of the fluid passing through the valve body (1a, 27). , S404) and the flow of the fluid flowing through the valve body (1a, 27), the valve body (1a, 27) is connected to the electric signal for a predetermined pressure release valve opening time (t5). opened or without e Bei and pressure vent means (S407~S409) to reduce the pressure of the stored said fluid upstream of said valve body (1a, 27),
The control device (23), after blocking the flow of the fluid flowing through the valve body (1a, 27) by the flow rate control means (S402, S404), after a preset standby time (t4) has elapsed, The pressure relief means (S407 to S409) reduces the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27),
The upstream side of the valve body (1a, 27) communicates with another valve body (2a) through the fluid,
The controller (23) has a predetermined elapsed time (t6) longer than the waiting time (t4) after the valve body (1a, 27) is closed by the pressure release means (S407 to S409). After the passage, the valve body (1a, 27) is opened by the pressure release means (S407 to S409) regardless of the presence or absence of the electrical signal from the electrical signal input unit (20),
An electrically driven valve characterized in that the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27) is reduced by the pressure release means (S407 to S409) . An electrically driven valve (1) attached to a pipe (7) through which fluid flows,
A valve body (1a, 27) that is opened and closed in accordance with an electrical signal;
A control device (23) for controlling the opening and closing of the valve body (1a, 27);
An electric signal input unit (20) for supplying an electric signal to the control device (23) and driving the valve body (1a, 27) via the control device (23) according to the electric signal. ,
The control device (23)
A flow rate control means (S402) that opens and closes the valve body (1a, 27) according to the electrical signal from the electrical signal input unit (20) and controls the flow rate of the fluid passing through the valve body (1a, 27). , S404) and the flow of the fluid flowing through the valve body (1a, 27), the valve body (1a, 27) is connected to the electric signal for a predetermined pressure release valve opening time (t5). Pressure release means (S407 to S409) that opens regardless of the presence or absence and reduces the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27).
Further, the fluid that is opened by the pressure release means (S407 to S409) and accumulated on the upstream side of the valve body (1a, 27) regardless of the presence or absence of the electrical signal from the electrical signal input unit (20). pressure release selection switch (28) shall be the characteristic electrical driven valve further comprising a selectively disable the operation to reduce the pressure. The electrically driven valve according to claim 1 or 2, wherein the pipe (7) has a check valve (3, 5) upstream of the valve body (1a, 27) . The control device (23), after blocking the flow of the fluid flowing through the valve body (1a, 27) by the flow rate control means (S402, S404), after a preset standby time (t4) has elapsed, The electrically driven valve according to claim 2 , wherein the pressure of the fluid accumulated on the upstream side of the valve body (1a, 27) is reduced by the pressure release means (S407 to S409) . The pressure relief means (S407 to S409) opens the valve body (1a, 27) for the pressure relief valve opening time (t5) by the flow rate control means (S402, S404), and the valve body (1a 27) and the check valve, the pressure of the fluid is relieved. The valve body (1a, 27) consists of a main valve of a pilot solenoid valve,
The flow rate control means (S402, S404) instructs the electromagnetic coil (27c) of the pilot type solenoid valve to apply a pulse voltage (Po) for valve opening and a pulse voltage (Pc) for valve closing. The electrically driven valve according to claim 1, wherein the valve is electrically driven. The electric signal input unit (20) automatically detects the necessity of passage of the fluid via the valve body (1a, 27) and supplies the electric signal,
Electric drive according to any one of the preceding claims, characterized in that the valve body (1a, 27) forms a valve body (1a, 27) of an automatic valve controlled by the electrical signal. valve. The electrically driven valve according to claim 5 , wherein the pressure release time (t5) of the valve body (1a, 27) by the pressure release means (S407 to S409) is 2 seconds or less. . The check valve is a check valve (3) provided on the downstream side of the electric water heater (4) provided on the upstream side of the valve body (1a, 27) or on the upstream side of the electric water heater (4). The electrically driven valve according to claim 3 , comprising: 5) . The electric signal input unit (20) generates the electric signal by blocking or reflecting light, and the valve body (1a, 27) is composed of an electromagnetic valve of an automatic faucet,
The electric water heater (4) is provided on the upstream side of the solenoid valve to raise the temperature of the water that is the fluid flowing through the faucet of the automatic faucet to make hot water,
The check valve is a protective check valve (3) for protecting the electric water heater (4) provided between the electric water heater (4) and the valve body (1a, 27), or 10. The electrically driven valve according to claim 9 , further comprising a check valve (5) for preventing a backflow of the fluid upstream of the electric water heater (4) .

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