JP5948063B2 - Automatic valve and its opening and closing method - Google Patents

Description

  The present invention relates to an automatic valve for opening and closing a flow path in an outflow pipe of a water tank and a method for opening and closing the automatic valve.

  FIG. 1 is a schematic diagram of a conventional automatic valve. As shown in FIG. 1, the automatic valve 500 is a valve that opens and closes the flow path of the outflow pipe 504 of the water tank 502. The automatic valve 500 includes a rubber operation diaphragm 505 and a valve body diaphragm 510. A spacer 520 is interposed between the operation diaphragm 505 and the valve element diaphragm 510, and the operation diaphragm 505 and the valve element diaphragm 510 are interlocked via the spacer 520. The automatic valve 500 is connected to the compressor 524 via a solenoid valve 522. The compressor 524 closes the valve element diaphragm 510, which is a valve element, by applying air pressure to the operation diaphragm 505 via the electromagnetic valve 522. On the other hand, by stopping the supply of the compressed gas by the compressor 524 and releasing the compressed gas to the atmosphere, the valve body diaphragm 510 is pushed by the pressure of the liquid flowing out from the outflow pipe 504 (primary side pressure), and the valve body diaphragm 510 is opened.

  However, since such an automatic valve 500 has a structure in which the valve body diaphragm 510 is closed by applying air pressure from the compressor 524 to the operation diaphragm 505, when the air pressure from the compressor 524 is lost due to a power failure or the like, The valve body diaphragm 510 opens and the liquid in the water tank 502 flows out.

  The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide an automatic valve that can reliably close the automatic valve when the supply of electricity is stopped, such as during a power failure. Another object of the present invention is to provide a method for opening and closing such an automatic valve.

  In order to achieve the above-described object, one aspect of the present invention is an automatic valve that opens and closes a flow path of an outflow pipe connected to a water tank, the valve seat connected to the outflow pipe, and the valve seat A valve body diaphragm that is pressed; an operation diaphragm that forms a part of the liquid chamber; and a connecting member that connects the valve body diaphragm and the operation diaphragm. The liquid chamber communicates with a storage tank that stores liquid. The liquid level position of the storage tank is the same as or higher than the liquid level position of the water tank, and the pressure receiving area of the operation diaphragm is larger than the pressure receiving area of the valve body diaphragm. To do.

In a preferred aspect of the present invention, the storage tank is the water tank, and the liquid chamber communicates with the water tank.
In a preferred aspect of the present invention, the operation diaphragm and the valve body diaphragm are arranged at the same height.
In a preferred aspect of the present invention, an air chamber is formed between the valve body diaphragm and the operation diaphragm.
Another aspect of the present invention is an automatic valve that opens and closes a flow path of an outflow pipe connected to a water tank, a valve seat connected to the outflow pipe, a valve body diaphragm pressed against the valve seat, and a liquid An operation diaphragm that forms a part of the chamber; and a connecting member that connects the valve body diaphragm and the operation diaphragm. The liquid chamber communicates with a storage tank that stores liquid, and the liquid in the storage tank The surface position is the same as or higher than the liquid surface position of the water tank, the pressure receiving area of the operation diaphragm is larger than the pressure receiving area of the valve body diaphragm, and the storage tank is provided separately from the water tank. It is an automatic valve characterized by

In a preferred aspect of the present invention, a first pipe connecting the storage tank and the liquid chamber, a second pipe for discharging the liquid in the liquid chamber, and a first pipe provided in the first pipe are provided. 1 solenoid valve and a second solenoid valve provided in the second pipe, the first solenoid valve opens when the supply of electricity stops, and the second solenoid valve It is characterized in that it is configured to close when the supply of is stopped.
Still another aspect of the present invention is a method for opening and closing the automatic valve, wherein the first electromagnetic valve is opened and the second electromagnetic valve is closed, whereby the liquid in the storage tank is allowed to flow into the liquid chamber. The valve body diaphragm is closed by the pressure of the liquid in the liquid chamber, the first solenoid valve is closed, and the second solenoid valve is opened, so that the valve by the pressure of the liquid from the outflow pipe is opened. It is characterized by opening the body diaphragm.

In a preferred aspect of the present invention, a partition plate is provided between the valve body diaphragm and the operation diaphragm, and a compressed gas chamber into which compressed gas is injected is provided between the operation diaphragm and the partition plate. It is formed.
Still another aspect of the present invention is a method for opening and closing the automatic valve, wherein the compressed gas is injected into the compressed gas chamber, whereby the pressure of the compressed gas in the compressed gas chamber and the liquid from the outflow pipe are reduced. The valve body diaphragm is opened by pressure, the injection of the compressed gas into the compressed gas chamber is stopped, and the compressed gas chamber is opened to the atmosphere, whereby the valve is operated by the pressure of the liquid in the liquid chamber introduced from the storage tank. It is characterized by closing the body diaphragm.

  According to the present invention, the automatic valve is closed by applying the liquid pressure of a storage tank (a water tank to which an automatic valve is connected or a separately prepared water tank) to the operation diaphragm. Therefore, the liquid pressure is maintained even when the supply of electricity is stopped, such as during a power failure, and the automatic valve can be reliably closed.

It is a schematic diagram which shows the conventional automatic valve. It is a schematic diagram which shows the automatic valve which concerns on the 1st Embodiment of this invention. It is an expanded sectional view of the automatic valve shown in FIG. It is a figure which shows a mode that the automatic valve shown in FIG. 3 was closed. It is a schematic diagram which shows the example of a connection of the automatic valve shown in FIG. 2, and the operation liquid water tank. It is a schematic diagram which shows the automatic valve which concerns on the 2nd Embodiment of this invention. It is an expanded sectional view of the automatic valve shown in FIG. It is a schematic diagram which shows the example of a connection of the automatic valve shown in FIG. 6, and the operation liquid water tank.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 is a schematic view showing the automatic valve according to the first embodiment of the present invention. FIG. 3 is an enlarged cross-sectional view of the automatic valve shown in FIG. As shown in FIGS. 2 and 3, the automatic valve 1 includes a valve seat 12 connected to the outflow pipe 10 of the water tank 5, a valve body diaphragm 15 provided adjacent to the valve seat 12, and a valve body diaphragm. An operation diaphragm 20 that receives the pressure of the liquid for operating 15 and a spacer (connection member) 17 that connects the valve body diaphragm 15 and the operation diaphragm 20 are provided. The valve seat 12 has a cylindrical shape and is surrounded by a valve box 25. The valve body diaphragm 15 functions as a valve body that closes the opening 12 a of the valve seat 12, and the operation diaphragm 20 functions as an actuator for driving the valve body diaphragm 15.

  The valve box 25 has an opening 25a in the lower part thereof, and the liquid flowing into the valve box 25 through the valve seat 12 flows out from the opening 25a. An intermediate cylinder 27 is provided adjacent to the valve box 25, and the valve body diaphragm 15 is sandwiched between the valve box 25 and the intermediate cylinder 27. A cover 30 is provided adjacent to the intermediate cylinder 27, and the operation diaphragm 20 is sandwiched between the intermediate cylinder 27 and the cover 30. An air chamber 35 is formed by the intermediate body 27, the valve body diaphragm 15, and the operation diaphragm 20. An air hole 37 is formed in the intermediate cylinder 27, and the air chamber 35 has a structure in which air can enter and exit through the air hole 37.

  A spacer 17 is interposed between the valve body diaphragm 15 and the operation diaphragm 20. A disc-shaped fixing portion 44 is formed at one end portion of the spacer 17, and the valve body diaphragm 15 is fixed to the fixing portion 44. A disc-shaped fixing portion 42 is formed at the other end portion of the spacer 17, and the operation diaphragm 20 is fixed to the fixing portion 42. Accordingly, the valve body diaphragm 15 and the operation diaphragm 20 are linked via the spacer 17. A guide spindle (support member) 40 is fixed to the cover 30, and the spacer 17 is slidably supported on the guide spindle 40. The lateral movement of the spacer 17 is guided by the guide spindle 40.

  A liquid chamber 50 is formed from the cover 30 and the operation diaphragm 20. Through holes 52 and 54 are formed in the cover 30. One end 60 a of the pipe 60 is connected to the through hole 52 formed in the upper part of the cover 30, and one end 65 a of the pipe 65 is connected to the through hole 54 formed in the lower part of the cover 30. Yes. As shown in FIG. 2, solenoid valves 70 and 75 are provided in the pipes 60 and 65. The other end 60 b of the pipe 60 is connected to the water tank 5. Therefore, the liquid in the water tank 5 is introduced into the liquid chamber 50 through the pipe 60 by its own weight. The other end 65 b of the pipe 65 is open so that the liquid in the liquid chamber 50 can be discharged through the pipe 65. The other end 60 b of the pipe 60 may be disposed anywhere as long as it is below the liquid level of the water tank 5.

  The operation diaphragm 20 is larger than the valve body diaphragm 15, and the size of the fixed portion 42 to which the operation diaphragm 20 is fixed is larger than the fixed portion 44 to which the valve body diaphragm 15 is fixed. That is, the pressure receiving area of the operation diaphragm 20 is larger than the pressure receiving area of the valve body diaphragm 15. As an example, if the diameter of the fixing portion 44 for the valve body diaphragm 15 is 330 millimeters, the diameter of the fixing portion 42 for the operation diaphragm 20 is 470 millimeters. The diameter of the valve seat 12 (that is, the inner diameter of the opening 12a) is set smaller than the diameter of the fixed portion 44.

  When the automatic valve 1 is opened, the electromagnetic valve 70 is closed and the electromagnetic valve 75 is opened. Thereby, since the liquid does not flow into the automatic valve 1, the liquid chamber 50 becomes empty. Therefore, no liquid pressure is applied to the operation diaphragm 20. On the other hand, since the pressure (primary side pressure) of the liquid from the water tank 5 is applied to the valve body diaphragm 15 through the outflow pipe 10, the valve body diaphragm 15 is opened. Since the solenoid valve 70 is closed, the pipe 60 from the end 60b to the solenoid valve 70 is filled with liquid.

  When the automatic valve 1 is closed, the electromagnetic valve 75 is closed and the electromagnetic valve 70 is opened. Then, as shown in FIG. 4, the liquid flows into the liquid chamber 50 through the pipe 60, and the liquid chamber 50 is filled with the liquid. The operation diaphragm 20 is subjected to liquid pressure from the water tank 5. Since the operation diaphragm 20 and the valve body diaphragm 15 are disposed at the same height, the pressure of the liquid applied to the operation diaphragm 20 and the pressure of the liquid applied to the valve body diaphragm 15 are the same. Since the pressure receiving area of the operation diaphragm 20 is larger than the pressure receiving area of the valve body diaphragm 15, the force acting on the operation diaphragm 20 is larger than the force acting on the valve body diaphragm 15. Therefore, the operation diaphragm 20 pushes the valve body diaphragm 15 through the spacer 17 and the automatic valve 1 is closed.

  When the automatic valve 1 is opened again, the electromagnetic valve 70 is closed and the electromagnetic valve 75 is opened. When the electromagnetic valve 70 is closed, pressurization of the operation diaphragm 20 by the liquid is stopped. At the same time, since the electromagnetic valve 75 is opened, the liquid in the liquid chamber 50 is discharged. Thereby, the valve body diaphragm 15 is pushed by the liquid from the water tank 5, and the automatic valve 1 is opened as shown in FIG.

  As the solenoid valve 70, a solenoid valve that opens when the supply of electricity stops is used. As the solenoid valve 75, a solenoid valve that closes when the supply of electricity stops is used. Thereby, for example, when the supply of electricity is stopped due to a power failure or the like, the electromagnetic valve 70 is automatically opened and the electromagnetic valve 75 is closed. Then, as described above, the liquid flows into the liquid chamber 50, and the operation diaphragm 20 pushes the valve body diaphragm 15 through the spacer 17, so that the automatic valve 1 is closed. The water tank 5 itself functions as a storage tank that stores the liquid supplied to the liquid chamber 50.

  As shown in FIG. 5, the other end 60 b of the pipe 60 may be connected to an operation liquid water tank (storage tank) 80 installed separately from the water tank 5. The water tank 80 has a capacity larger than the capacity of the liquid chamber 50. A float valve 78 is provided on the liquid level of the water tank 80. The liquid level of the water tank 80 is kept constant by the float valve 78. The liquid level of the water tank 80 and the liquid level of the water tank 5 are the same height. Therefore, the water tank 80 can supply a liquid having the same pressure as the water tank 5 to the liquid chamber 50. The liquid level of the water tank 80 may be higher than the liquid level of the water tank 5. Even in this case, the operation diaphragm 20 that receives the pressure of the liquid in the liquid chamber 50 can press the valve body diaphragm 15 against the valve seat 12.

  The automatic valve 1 may be used as a sludge discharge valve. Therefore, when sludge is contained in the water tank 5, if the sludge in the water tank 5 flows into the liquid chamber 50, the through holes 52 and 54 may be blocked. In order to prevent this, a water tank 80 is preferably disposed. Since the water tank 80 does not contain sludge, there is no possibility that the through holes 52 and 54 are blocked.

  The automatic valve 1 of the present embodiment is a valve that can close the valve body diaphragm 15 by applying a liquid pressure in the water tank 5 or a liquid pressure equivalent thereto to the operation diaphragm 20. Furthermore, since the automatic valve 1 of the present embodiment has a structure in which the diaphragm 15 as the valve body is closed not by the pneumatic pressure of the compressor or the like but by the liquid pressure of the water tank, even when the supply of electricity stops, such as during a power failure Liquid pressure is maintained. Therefore, it is possible to prevent the liquid in the water tank 5 from flowing out by closing the automatic valve 1 during a power failure.

  FIG. 6 is a schematic view showing an automatic valve according to the second embodiment of the present invention. Note that the configuration of the present embodiment that is not particularly described is the same as that of the first embodiment described above, and thus redundant description thereof is omitted.

  The automatic valve 1 shown in FIG. 6 is a single-acting automatic valve that opens the automatic valve 1 with compressed gas pressure and closes the automatic valve 1 with liquid pressure. The automatic valve 1 includes a valve body diaphragm 15 as a valve body, and an operation diaphragm 20 for receiving the pressure of liquid for operation and the pressure of compressed gas. The valve body diaphragm 15 functions as a valve body that closes the opening of the valve seat 12, and the operation diaphragm 20 functions as an actuator for driving the valve body diaphragm 15.

  FIG. 7 is an enlarged cross-sectional view of the automatic valve shown in FIG. As shown in FIG. 7, a partition plate 100 is provided in a space formed by the valve body diaphragm 15, the operation diaphragm 20, and the intermediate body 27. The partition plate 100 has a disk shape, and partitions the space formed by the valve body diaphragm 15, the operation diaphragm 20, and the intermediate body 27 into an air chamber 105 and a compressed gas chamber 110. A seal holding member 102 is fixed to the central portion of the partition plate 100. The seal holding member 102 holds an O-ring 112, and the O-ring 112 exists between the seal holding member 102 and the spacer 17. The O-ring 112 allows the spacer 17 to move in the axial direction while blocking the gas flow between the air chamber 105 and the compressed gas chamber 110.

  An air hole 37 is formed in the intermediate cylinder 27, and the air chamber 105 has a structure in which air can enter and exit through the air hole 37. Further, a gas injection hole 114 for injecting compressed gas into the compressed gas chamber 110 is formed in the intermediate cylinder 27. The gas injection hole 114 is connected to a compressor (compressed gas supply source) 130 through the pipe 120. The pipe 120 is provided with a three-way valve (solenoid valve) 125, and the compressor 130 and the compressed gas chamber 110 or the compressed gas chamber 110 and the atmosphere communicate with each other through the three-way valve 125.

  The cover 30 is provided with a through hole 52, but is not provided with the through hole 54 shown in FIG. One end 60 a of the pipe 60 is connected to the through hole 52, and the other end 60 b of the pipe 60 is connected to the water tank 5. The liquid in the water tank 5 is introduced into the liquid chamber 50 through the pipe 60 by its own weight. In the second embodiment, the above-described electromagnetic valves 70 and 75 (see FIG. 2) are not provided.

  Next, the opening / closing operation of the automatic valve 1 will be described. When the automatic valve 1 is opened, compressed gas is injected into the compressed gas chamber 110 from the compressor 130 through the three-way valve 125 and the gas injection hole 114. The resultant force of the force in which the compressed gas in the compressed gas chamber 110 pushes the operation diaphragm 20 and the force in which the liquid from the water tank 5 pushes the valve element diaphragm 15 is greater than the force with which the liquid in the liquid chamber 50 pushes the operation diaphragm 20. As a result, the automatic valve 1 is opened. When the automatic valve 1 is closed, injection of the compressed gas into the compressed gas chamber 110 is stopped, and the compressed gas chamber 110 is opened to the atmosphere via the three-way valve 125. Since the pressure receiving area of the operation diaphragm 20 is larger than the pressure receiving area of the valve body diaphragm 15, the force acting on the operation diaphragm 20 is larger than the force acting on the valve body diaphragm 15. Therefore, the operation diaphragm 20 pushes the valve body diaphragm 15 through the spacer 17 and the automatic valve 1 is closed.

  Since the liquid in the water tank 5 is introduced into the liquid chamber 50 through the pipe 60 by its own weight, the automatic valve 1 is closed unless the compressed gas is injected into the compressed gas chamber 110. The automatic valve 1 is opened by injecting the compressed gas into the compressed gas chamber 110. With this configuration, for example, when the supply of compressed gas from the compressor 130 stops due to a power failure or the like, the operation diaphragm 20 automatically moves to the valve seat 12 side due to the liquid pressure in the liquid chamber 50, and the valve The body diaphragm 15 is pressed against the valve seat 12. Therefore, the outflow of the liquid in the water tank 5 can be prevented.

  FIG. 8 is a schematic diagram showing another connection example of the automatic valve shown in FIG. As shown in FIG. 8, the other end 60 b of the pipe 60 may be connected to a water tank 80 provided separately from the water tank 5. The water tank 80 has a capacity larger than the capacity of the liquid chamber 50. A float valve 78 is provided on the liquid level of the water tank 80. The liquid level of the water tank 80 is kept constant by the float valve 78. The liquid level of the water tank 80 and the liquid level of the water tank 5 are the same height. Therefore, the water tank 80 can supply the liquid having the same pressure as the water tank 5 to the liquid chamber 50. The liquid level of the water tank 80 may be higher than the liquid level of the water tank 5. Even in this case, the operation diaphragm 20 that receives the pressure of the liquid in the liquid chamber 50 can press the valve body diaphragm 15 against the valve seat 12.

  The automatic valve 1 may be used as a sludge discharge valve. Therefore, when sludge is contained in the water tank 5, if the sludge in the water tank 5 flows into the liquid chamber 50, the through hole 52 may be blocked. In order to prevent this, the water tank 80 is preferably disposed. Since the water tank 80 does not contain sludge, the through hole 52 is not likely to be blocked.

The automatic valve according to the first and second embodiments has the following advantages.
(1) Since the liquid is introduced into the liquid chamber 50 by its own weight, the pressure of the liquid is applied to the operation diaphragm 20 even during a power failure, and the valve body diaphragm 15 can be closed. Therefore, the automatic valve 1 can be used during emergency operation or as an emergency shut-off valve.
(2) By using the pressure of the liquid, there is no need for a powerful spring for returning the valve body, that is, for closing the valve body diaphragm 15, so that the actuator for driving the valve body can be made compact.
(3) By using the diaphragm type actuator (that is, the operation diaphragm 20), the structure of the automatic valve can be simplified, and the number of parts can be reduced.
(4) By using a diaphragm type actuator, it is not necessary to use oils and fats at the site where oils and fats are hated, such as waterworks.
(5) By making the pressure receiving area of the operation diaphragm larger than the pressure receiving area of the valve body diaphragm, and introducing the pressure of the liquid from the storage tank (a water tank to which an automatic valve is connected or a water tank prepared separately) into the operation diaphragm The automatic valve can be closed without introducing external operating force.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention should not be limited to the described embodiments, but should be the widest scope according to the technical idea defined by the claims.

DESCRIPTION OF SYMBOLS 1 Automatic valve 5 Water tank 10 Outflow piping 12 Valve seat 15 Valve body diaphragm 17 Spacer (connection member)
20 Operation diaphragm 25 Valve box 27 Intermediate cylinder 30 Cover 35, 105 Air chamber 37 Air hole 40 Guide spindle 42, 44 Fixing part 50 Liquid chamber 52, 54 Through hole 60, 65, 120 Piping 70, 75 Solenoid valve 78 Float valve 80 Water tank for operation liquid 100 Partition plate 102 Seal holding member 110 Compressed gas chamber 112 O-ring 114 Gas injection hole 125 Three-way valve 130 Compressor

Claims (9)

An automatic valve that opens and closes the flow path of the outflow pipe connected to the water tank,
A valve seat connected to the outflow pipe;
A valve body diaphragm pressed against the valve seat;
An operation diaphragm that forms part of the liquid chamber;
A connecting member for connecting the valve body diaphragm and the operation diaphragm;
The liquid chamber communicates with a storage tank for storing liquid,
The liquid level position of the storage tank is the same as or higher than the liquid level position of the water tank,
2. The automatic valve according to claim 1, wherein a pressure receiving area of the operation diaphragm is larger than a pressure receiving area of the valve body diaphragm.   The automatic valve according to claim 1, wherein the storage tank is the water tank, and the liquid chamber communicates with the water tank.   The automatic valve according to claim 1 or 2, wherein the operation diaphragm and the valve body diaphragm are arranged at the same height.   The automatic valve according to any one of claims 1 to 3, wherein an air chamber is formed between the valve body diaphragm and the operation diaphragm. An automatic valve that opens and closes the flow path of the outflow pipe connected to the water tank,
A valve seat connected to the outflow pipe;
A valve body diaphragm pressed against the valve seat;
An operation diaphragm that forms part of the liquid chamber;
A connecting member for connecting the valve body diaphragm and the operation diaphragm;
The liquid chamber communicates with a storage tank for storing liquid,
The liquid level position of the storage tank is the same as or higher than the liquid level position of the water tank,
The pressure receiving area of the operation diaphragm is larger than the pressure receiving area of the valve body diaphragm,
Own valve operating said reservoir you characterized in that provided separately from the water tank. A first pipe connecting the storage tank and the liquid chamber;
A second pipe for discharging the liquid in the liquid chamber;
A first solenoid valve provided in the first pipe;
A second solenoid valve provided in the second pipe,
The first solenoid valve opens when the supply of electricity stops,
The automatic valve according to any one of claims 1 to 5 , wherein the second solenoid valve is configured to close when supply of electricity stops. A partition plate is provided between the valve body diaphragm and the operation diaphragm,
The automatic valve according to any one of claims 1 to 5 , wherein a compressed gas chamber into which compressed gas is injected is formed between the operation diaphragm and the partition plate. A method for opening and closing an automatic valve according to claim 6 ,
By opening the first electromagnetic valve and closing the second electromagnetic valve, the liquid in the storage tank is introduced into the liquid chamber, and the valve body diaphragm is closed by the pressure of the liquid in the liquid chamber,
A method of closing the first electromagnetic valve and opening the second electromagnetic valve to open the valve body diaphragm by the pressure of the liquid from the outflow pipe. A method for opening and closing an automatic valve according to claim 7 ,
By injecting the compressed gas into the compressed gas chamber, the valve body diaphragm is opened by the pressure of the compressed gas in the compressed gas chamber and the pressure of the liquid from the outflow pipe,
The valve body diaphragm is closed by the pressure of the liquid in the liquid chamber introduced from the storage tank by stopping the injection of the compressed gas into the compressed gas chamber and opening the compressed gas chamber to the atmosphere. Method.

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