JP5995557B2 - Constant flow needle valve and automatic valve device using the same - Google Patents

Description

  The present invention relates to an automatic valve device that is installed in a tunnel such as a highway, for example, and supplies pressurized water to a water discharge head to discharge water, and a constant flow rate used for draining pressurized water of an actuator that opens and closes the valve body of the automatic valve device. The present invention relates to a needle valve.

  When a conventional watering system is used for a tunnel, a fire prevention zone is set by dividing the longitudinal direction of the tunnel into a predetermined distance, and a fire prevention zone including the source of the fire is specified at the time of a fire, and the entire area of the fire prevention zone is specified. Sprinkle water. In this watering system, the main pipe connected to the pressurized water supply source is buried and laid in the tunnel, and in each fire prevention section, the branch pipe branches off from the main pipe and rises along the side wall of the tunnel, and water is discharged at the tip of the water. The head is connected. The required number of water discharge heads is provided according to the size of the fire prevention compartment. Each branch pipe is provided with a gate valve, and further, an automatic valve device is provided on the secondary side thereof. This automatic valve device opens when a fire occurs and supplies pressurized water to the water discharge head, and closes after the fire is extinguished to stop the supply of pressurized water to the water discharge head.

  Such a conventional automatic valve device includes an automatic valve that supplies pressurized water to the water discharge head, an actuator that opens and closes the valve body of the automatic valve, and a pressure adjustment that supplies pressurized water for driving adjusted to a predetermined pressure to the actuator. And an automatic drain valve for draining the pressurized water of the actuator via the pressure regulating valve in a state where the supply of the pressurized water to the actuator is stopped (see, for example, Patent Document 1).

JP 2010-5240 A

  In the conventional automatic valve device, when the water discharge from the water discharge head is finished and the supply of the pressurized water to the actuator is stopped, the pressurized water in the actuator enters the pressure adjusting valve, passes through the orifice, Move to the room on the piping side. Next, it flows out from the pressure regulating valve to the pipe, flows through the pipe and is drained from the automatic drain valve to the drain, the pressure in the actuator is lowered, and the valve body of the automatic valve is closed.

  The orifice in the pressure regulating valve does not affect the operation of the actuator when adjusting the pressure by the actuator, and does not cause excessive water hammer when draining the pressurized water of the actuator in order to close the main valve after the end of water discharge. In order not to generate, it was adjusted to a minute gap. Therefore, foreign matter in the pressurized water is clogged in the orifice, and further, a product is produced in the orifice. In the worst case, the valve body of the automatic valve cannot be closed.

  The present invention has been made to solve the above-described problems. A multi-stage orifice is provided in the drainage port, the increase in the drainage flow rate is suppressed, the diameter of each orifice is increased, and the inflow pressure is increased. An automatic valve device that can prevent the occurrence of a situation in which the main valve cannot be closed by preventing the occurrence of a drainage failure due to clogging of foreign substances and the generation of products by causing the needle to contact and separate from the inflow hole, and the automatic valve device used therefor The purpose is to obtain a constant flow needle valve.

Constant flow needle valve according to the invention, the inlet port having a primary fluid entering the primary pressure is introduced through the inlet, the flow rate adjusting chamber, drainage port communicating with the said flow control chamber and the outside, and the primary fluid entering the A body having a reference pressure chamber disposed between the flow rate adjustment chamber and the reference pressure chamber and the flow rate adjustment chamber are disposed within the body so as to isolate the pressure in the flow rate adjustment chamber. Accordingly, the needle support portion configured to be displaceable to the reference pressure chamber side and the flow rate adjustment chamber side, and a partition wall between the reference pressure chamber and the primary pressure inflow chamber of the body pass through the length direction. The needle support portion is supported by the needle support portion so that a predetermined gap is secured between the one end extending into the primary pressure inflow chamber and the inflow hole so as to coincide with the displacement direction of the needle support portion. In conjunction with the displacement of the part, the one end A needle which is displaced so as to contact and separation in the hole is provided with a communication passage for communicating the primary fluid entering and the flow regulating chamber above, and multistage orifices disposed within said drain port, a.

According to the present invention, since one end of the needle comes into contact with and separates from the inflow hole according to the pressure in the flow rate adjusting chamber, foreign matter is less likely to bite between the one end of the needle and the inflow hole, and the needle is fixed to the inflow hole. Occurrence of such a situation is avoided, and stable operation of the constant flow needle valve is realized.
Since the drainage flow rate is defined by the multistage orifice provided in the drainage port, the orifice diameter can be made larger than when the drainage flow rate is defined by one orifice. Therefore, the occurrence of a situation where foreign matter is clogged in the orifice or a product is produced in the orifice and the constant flow needle valve becomes inoperable is suppressed.
Since the inflow hole does not regulate the drainage flow rate, the diameter of the inflow hole can be increased. Therefore, occurrence of a situation in which the product is generated in the inflow hole and the constant flow needle valve becomes inoperable is suppressed.

It is sectional drawing which shows the steady state of the constant flow needle valve which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the operating state of the constant flow needle valve which concerns on Embodiment 1 of this invention. It is a schematic block diagram which shows the automatic valve apparatus which concerns on Embodiment 2 of this invention. It is a figure explaining the raise operation | movement of the secondary side pressure at the time of water discharge in the automatic valve apparatus which concerns on Embodiment 2 of this invention. It is a figure explaining the fall operation | movement of the secondary side pressure at the time of water discharge in the automatic valve apparatus which concerns on Embodiment 2 of this invention. It is a figure explaining the water discharge stop operation | movement in the automatic valve apparatus which concerns on Embodiment 2 of this invention.

  Hereinafter, preferred embodiments of a constant flow needle valve and an automatic valve device of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a sectional view showing a steady state of a constant flow needle valve according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view showing an operating state of the constant flow needle valve according to Embodiment 1 of the present invention.

  In FIG. 1, the constant flow needle valve 1 includes an inflow port 5 having a primary pressure inflow chamber 6 into which a primary pressure flows through an inflow hole 14, a flow rate adjustment chamber 8, a drainage port 23 that communicates the flow rate adjustment chamber 8 with the outside. And the body 2 having the reference pressure chamber 7 disposed between the primary pressure inflow chamber 6 and the flow rate adjusting chamber 8 and the reference pressure chamber 7 and the flow rate adjusting chamber 8 are disposed in the body 2 so as to be isolated from each other. The needle support portion 15 configured to be displaceable to the reference pressure chamber 7 side and the flow rate adjustment chamber 8 side, and a partition between the reference pressure chamber 7 and the primary pressure inflow chamber 6 of the body 2 pass through one end. The length direction is matched with the displacement direction of the needle support portion 15 so as to extend into the pressure inflow chamber 6 and is supported by the needle support portion 15, and one end of the inflow hole 14 is interlocked with the displacement of the needle support portion 15. A needle 18 that is displaced so as to be in contact with and away from the main body, and a primary pressure flow A communication passage 21 communicating the chamber 6 and the flow rate adjusting chamber 8, and a, a multi-stage orifice 24 which is disposed within the drain port 23.

The body 2 includes a first body 3 in which a reference pressure chamber 7 isolated from the inflow port 5 and the primary pressure inflow chamber 6 of the inflow port 5 is formed, and a second body 4 in which a flow rate adjusting chamber 8 and a drainage port 23 are formed. And is composed of.
The fitting portion 9 is isolated from the reference pressure chamber 7 and is recessed in the first body 3 in a bottomed cylindrical shape, and an internal thread portion 9a is formed on the inner peripheral surface thereof. A communication hole 10 is formed in the first body 3 so as to communicate the reference pressure chamber 7 and the outside.

  The connecting nipple 11 is formed coaxially with the first cylindrical portion 12 through the bottom, and has a bottomed cylindrical first cylindrical portion 12 having a first male threaded portion 12a formed on the outer peripheral surface, and a second male screw on the outer peripheral surface. A bottomed cylindrical second tube portion 13 formed with a portion 13a, and bottom portions of the first tube portion 12 and the second tube portion 13, that is, an inflow hole 14 formed coaxially in the partition wall. Yes. Then, the connection nipple 11 is attached to the fitting portion 9 by screwing the first male screw portion 12a to the female screw portion 9a. An O-ring 20 is attached to the screwed portions of the fitting portion 9 and the first tube portion 12, and a seal between the screwed portions of the fitting portion 9 and the first tube portion 12 is ensured. A space defined by the first cylindrical portion 12 and the fitting portion 9 constitutes the primary pressure inflow chamber 6.

  The needle support portion 15 includes a movable portion 16 made in a ring flat plate shape, and a holder portion 17 attached to the inner peripheral portion of the movable portion 16. The needle support portion 15 pressurizes and holds the outer peripheral portion of the movable portion 16 between the first body 3 and the second body 4 and separates the flow rate adjusting chamber 8 and the reference pressure chamber 7. The movable part 16 is produced, for example, by sandwiching a polyester cloth with nitrile butadiene rubber. The movable portion 16 is provided with rigidity by interposing a polyester cloth between nitrile butadiene rubbers, and has a spring property. Therefore, the needle support portion 15 can be displaced toward the flow rate adjustment chamber 8 side and the reference pressure chamber 7 side.

  The needle 18 is formed in a stepped columnar shape having a large diameter in the center in the length direction. The needle 18 passes through the partition wall between the reference pressure chamber 7 and the primary pressure inflow chamber 6 of the first body 3, extends one end into the primary pressure inflow chamber 6, and penetrates the holder portion 17 to connect the other end. A nut 19 that is extended into the flow rate adjusting chamber 8 and screwed to the other end is fastened, and the holder portion 17 is pressure-clamped between the nut 19 and the large diameter portion 18a. It is supported. An O-ring 20 is attached to the penetrating portion of the needle 18 of the holder portion 17 and the penetrating portion of the needle 18 of the first body 3, and the seal between the reference pressure chamber 7 and the flow rate adjusting chamber 8, and the reference pressure chamber 7 and the primary A seal with the pressure inflow chamber 6 is secured.

  The needle 18 is disposed coaxially with the fitting portion 9 and the first tube portion 12, and the needle support portion 15 is disposed so as to be orthogonal to the length direction of the needle 18. Therefore, the needle 18 is displaced in the length direction in conjunction with the displacement of the needle support portion 15, and one end thereof contacts and separates from the inflow hole 14. One end of the needle 18 is formed in a conical shape, and the needle facing surface of the inflow hole 14 is formed in a truncated conical shape having the same apex angle as one end of the needle 18.

  A communication passage 21 is formed to communicate the primary pressure inflow chamber 6 and the flow rate adjustment chamber 8 through the axis of the needle 18. A spring 22 is contracted between the bottom of the reference pressure chamber 7 and the holder portion 17 to urge the needle support portion 15 toward the flow rate adjustment chamber 8. In the steady state, the holder portion 17 comes into contact with the shoulder portion 4a of the second body 4, and a gap between one end of the needle 18 and the inflow hole 14 is secured. The multi-stage orifice 24 is configured by connecting a plurality of adjacent orifices in the drain port 23 at predetermined intervals in the axial direction so that at least one of the radial position and the circumferential position of adjacent orifices is different. Therefore, a large flow resistance is realized as a whole.

The operation of the constant flow needle valve 1 configured as described above will be described.
In this constant flow needle valve 1, a multistage orifice 24 is disposed in the drainage port 23 to regulate the drainage flow rate. That is, the channel resistance of the multistage orifice 24 is set so that a predetermined drainage flow rate is obtained. Therefore, the diameter of the inflow hole 14 is set so that its flow resistance is smaller than that of the multistage orifice 24. That is, the diameter of the inflow hole 14 is formed large so as not to affect the drainage flow rate. However, from the viewpoint of preventing clogging of foreign matter at the multistage orifice 24, it is desirable that the diameter of the inflow hole 14 be smaller than the diameter of each orifice of the multistage orifice 24.

  In the steady state, as shown in FIG. 1, the holder portion 17 is pressed toward the flow rate adjusting chamber 8 by the urging force of the spring 22 and is in contact with the shoulder portion 4 a of the second body 4. Therefore, a predetermined gap is secured between one end of the needle 18 and the inflow hole 14. That is, the constant flow needle valve 1 is a normally open type. In addition, air is introduced into the reference pressure chamber 7 through the communication hole 10.

  Next, water flows into the primary pressure inflow chamber 6 from between the inflow hole 14 and one end of the needle 18. The water flowing into the primary pressure inflow chamber 6 flows into the flow rate adjustment chamber 8 through the communication path 21. Water flowing into the flow rate adjusting chamber 8 is drained from the drain port 23 through the multistage orifice 24. At this time, since the flow resistance of the inflow hole 14 is configured to be smaller than the flow resistance of the multistage orifice 24, the amount of inflow from the inflow port 5 becomes larger than the amount of drainage from the drainage port 23, Pressure increases.

  As shown in FIG. 2, the pressure in the flow rate adjusting chamber 8 is determined by the sum of the pressure in the reference pressure chamber 7, the urging force of the spring 22, and the pressure at which the inflowing water acts on one end surface of the needle 18. If it becomes larger, the needle support portion 15 is displaced toward the reference pressure chamber 7 side, and the gap between one end of the needle 18 and the inflow hole 14 is narrowed. As a result, the amount of drainage from the drainage port 23 becomes larger than the amount of inflow from the inflow port 5, and the pressure in the flow rate adjusting chamber 8 decreases.

  When the pressure in the flow rate adjustment chamber 8 becomes smaller than the sum of the pressure in the reference pressure chamber 7, the biasing force of the spring 22, and the pressure at which the inflowing water acts on one end surface of the needle 18, the needle support portion 15. Is displaced toward the flow rate adjusting chamber 8, and the gap between one end of the needle 18 and the inflow hole 14 is widened. Thereby, the inflow amount from the inflow port 5 becomes larger than the drainage amount from the drainage port 23, and the pressure in the flow volume adjustment chamber 8 rises. This operation is repeated, and the gap between one end of the needle 18 and the inflow hole 14 causes the pressure in the flow rate adjusting chamber 8, the pressure in the reference pressure chamber 7, the urging force of the spring 22, and the flowing water to flow into the needle 18. The amount of drainage from the drainage port 23 of the constant flow needle valve 1 becomes constant by converging in a gap in which the sum of the pressure acting on one end surface of the nozzle and the sum is balanced.

  As described above, in the constant flow needle valve 1, the needle 18 is displaced in conjunction with the pressure fluctuation in the flow rate adjusting chamber 8, and the gap between one end of the needle 18 and the inflow hole 14 is enlarged or reduced. Therefore, even if foreign matter contained in the inflowing water is clogged between one end of the needle 18 and the inflow hole 14, the clogged foreign matter is removed when the needle 18 is separated. As a result, the occurrence of a situation in which foreign matter is clogged between one end of the needle 18 and the inflow hole 14 and the needle 18 is fixed to the inflow hole 14 is avoided, and stable operation of the constant flow needle valve 1 is realized. The

  Since the drainage flow rate defining part is constituted by the multistage orifice 24, the orifice diameter can be made larger than when the drainage flow rate regulating part is constituted by one orifice. Therefore, the occurrence of a situation where the foreign substance is clogged in the orifice or the product is produced in the orifice and the constant flow needle valve 1 becomes inoperable is suppressed.

  Since the inflow hole 14 does not constitute a drainage flow rate regulating portion, the diameter of the inflow hole 14 can be increased. Therefore, the occurrence of a situation in which the product is generated in the inflow hole 14 and the constant flow needle valve 1 becomes inoperable is suppressed. Further, if the diameter of the inflow hole 14 is made smaller than the diameter of each orifice of the multistage orifice 24, foreign matters larger than the orifice diameter do not enter the multistage orifice 24 side, and the occurrence of clogging of foreign matters in the multistage orifice 24 is ensured. It disappears.

Since the multistage orifice 24 defines the drainage flow rate, the multistage orifice 24 can be set so as to have a predetermined drainage flow rate at the time of factory shipment, and adjustment work at the site becomes unnecessary. Moreover, there is no need to readjust the drainage flow rate to the set value after maintenance.
Since the connection nipple 11 is detachably attached to the first body 3, if the connection nipple 11 having a different size of the second male screw portion 13a of the second cylindrical portion 13 is prepared, the constant flow needle valve 1 can be obtained on site. Can be easily connected to the piping.

Since the communication passage 21 is formed in the needle 18, it is not necessary to attach a communication pipe that connects the primary pressure inflow chamber 6 and the flow rate adjustment chamber 8 to the first body 3 and the second body 4. Therefore, the configuration is simplified, and the constant flow needle valve 1 can be reduced in size and cost.
Since the spring 22 urges the needle support portion 15 toward the flow rate adjusting chamber 8 to bring the holder portion 17 into contact with the shoulder portion 4a of the second body 4, one end of the needle 18 and the inflow hole 14 are caused by vibration or the like. The stable flow of the constant flow needle valve 1 is ensured.

  In the first embodiment, the movable part of the needle support part is made by sandwiching a polyester cloth with nitrile butadiene rubber, but the movable part is not limited to the configuration, and the working fluid, Here, it is only necessary that water does not pass therethrough and has a spring property. For example, a diaphragm can be used.

  In the first embodiment, the spring is contracted between the needle support portion and the bottom of the reference pressure chamber, but the spring may be omitted. In this case, the support structure of the needle by the needle support portion should be designed so that the clearance between the one end of the needle and the inflow hole becomes a predetermined value in the steady state using the spring property of the movable portion of the needle support portion. That's fine.

In the first embodiment, the communication passage is formed in the needle. However, a communication pipe that connects the primary pressure inflow chamber and the flow rate adjustment chamber may be attached to the first body and the second body. .
In the first embodiment, the spring is disposed in the reference pressure chamber so as to urge the needle support portion toward the flow rate adjustment chamber. However, the spring moves the needle support portion toward the flow rate adjustment chamber. It may be arranged in the flow rate adjustment chamber so as to be biased.

Embodiment 2. FIG.
The second embodiment relates to an automatic valve device using a constant flow needle valve.
FIG. 3 is a schematic configuration diagram showing an automatic valve device according to Embodiment 2 of the present invention.

  In FIG. 3, the automatic valve device changes the opening degree of the main valve 37 to adjust the flow rate of primary pressurized water flowing from the primary side flow path 32 to the secondary side flow path 33, and the automatic valve 100. The main valve drive mechanism of the main valve 37 is supplied with primary side pressurized water to start the automatic valve device, and when the secondary side pressurized water pressure reaches a predetermined pressure, the main valve 37 is opened. The pressure regulating valve 400 for controlling the degree of opening to the set opening and the secondary side of the automatic valve 100 are opened when water is discharged from the water discharge head 46, and the automatic valve 100 is tested without discharging water from the water discharge head 46. Water control valve 55 that closes at times, drainage unit 300 that drains secondary pressurized water in secondary flow path 33, and water discharge when the pressure of the secondary pressurized water of automatic valve 100 exceeds a predetermined water discharge pressure. A pressure switch 50 for transmitting a signal to a monitoring room, etc. It is equipped with a.

  This automatic valve device is installed, for example, in a tunnel such as a highway, a primary flow path 32 of the automatic valve 100 is connected to a main pipe (not shown), and a secondary flow path 33 is a water control valve 55. Is connected to the secondary side pipe 45, and a water discharge head 46 is provided at the tip of the secondary side pipe 45. In the automatic valve device, when the fire occurs, the automatic valve 100 opens to supply pressurized water to the water discharge head 46, closes after the fire is extinguished, and stops the supply of pressurized water to the water discharge head 46.

Next, the structure of the automatic valve 100 will be described.
The automatic valve 100 includes a body portion 31 including a body main body portion 31a and primary and secondary pipe lines 31b and 31c that are coaxially disposed on both sides of the body main body portion 31a. The trunk main body 31a has a circular cross-sectional shape orthogonal to the axes of the primary and secondary pipes 31b and 31c (hereinafter referred to as the trunk axis) arranged coaxially, and the circular cross section. The diameter is gradually increased from the primary side pipe line 31b toward the secondary side pipe line 31c, and is formed into a bulging body shape having an outer shape that gradually decreases through a maximum value.

  An isolation wall 34 is disposed so as to partition the inside of the body portion 31 into a primary side flow path 32 and a secondary side flow path 33. A communication hole 35 is formed in the isolation wall 34 so as to communicate the primary side flow path 32 and the secondary side flow path 33. Primary side pressurized water is supplied to the primary side flow path 32 via the primary side pipe line 31b, and the secondary side flow path 33 is connected to the secondary side pipe 45 via the secondary side pipe line 31c. A cylindrical cylinder 36 with a bottom is opened to the secondary side flow path 33 with the axis aligned with the hole center of the communication hole 35 and opposed to the communication hole 35 across the secondary side flow path 33. It is formed in the trunk body part 31a. The cylinder 36 has a circular cross-section of the trunk body 31 a protruding at a portion having the maximum diameter with the axis of the cylinder 36 orthogonal to the axis of the trunk 31.

  A main valve 37 is disposed in a primary side flow path 32 of the body part 31 at a valve seat 34 a formed at the outer peripheral edge of the communication hole 35 so as to be able to contact and separate in a direction perpendicular to the axis of the body part 31. . Further, a spring 38 as an urging means is provided in the primary side flow path 32 so as to press the main valve 37 toward the secondary side flow path 33. As a result, the main valve 37 is in close contact with the valve seat 34 a and closes the flow path between the primary flow path 32 and the secondary flow path 33.

  The piston 39 is slidably inserted into the cylinder 36, the O-ring 40 is fitted to the outer peripheral portion of the piston 39, and the inside of the cylinder 36 is connected to the piston chamber 36a on the secondary side flow path 33 side and the secondary side flow path. 33 and a working chamber 36b on the opposite side. Further, the stem 41 is attached so that one end is fixed to the center position of the piston 39 and the other end is fitted to the center position of the main valve 37, and the axis thereof coincides with the axis of the cylinder 36. . Here, the cylinder 36, the spring 38, the piston 39, the stem 41, and the like constitute a main valve drive mechanism. The axis of the cylinder 36 coincides with the contact / separation direction of the main valve 37.

The start valve 200 includes a pilot valve 48 and a manual start valve 49, and is connected to the first pipe 60 in parallel. A stop valve 47 is disposed on the upstream side of the start valve 200 in the first pipe 60.
The water control valve 55 is attached to the secondary side conduit 31 c of the body portion 31 using a water control valve mounting flange 57.
The drainage unit 300 includes an automatic drain valve 51 and a manual ball valve 52, and is disposed in the second pipe 61. A pressure switch 50 is disposed in the second pipe 61.

  The constant flow needle valve 1 is attached to the branch pipe 63 downstream of the start valve 200 of the first pipe 60 by fastening the second male screw part 13a of the second cylinder part 13 of the connection nipple 11. The constant flow needle valve 1 functions as a valve closing mechanism for the main valve 37 after the water discharge is stopped so that the primary pressurized water in the working chamber 36b is drained from the drain port 23 and the main valve 37 is closed. The flow path resistance of the multistage orifice 24 is set so that the set valve closing time of the main valve 37 is obtained. The flow path resistance of the multistage orifice 24 can be adjusted by, for example, the number of orifice stages.

  The pressure regulating valve 400 is configured by sandwiching a diaphragm 70 between a spring case 71 and a valve body 75. The spring case 71 is produced in a bottomed cylindrical shape. A spring 72 that applies a spring load for setting a prescribed pressure on the secondary side of the automatic valve 100 is contracted between the spring seat 73 and the diaphragm 70. Further, a pressure adjusting bolt 74 is screwed so as to penetrate the top of the spring case 71, and the amount of contraction of the spring 72 can be reduced by adjusting the amount of extension of the pressure adjusting bolt 74 into the spring case 71. Adjustable, spring load can be adjusted.

The valve body 75 is formed with a secondary pressure introducing chamber 76 defined by the diaphragm 70, a primary pressure introducing chamber 77, and a drain port 78 that communicates the primary pressure introducing chamber 77 with the atmosphere.
The shaft rod 79 is fixed to the diaphragm 70 at one end, is disposed so as to pass through the secondary pressure introduction chamber 76, pass through the valve body 75, and extend into the primary pressure introduction chamber 77. It is configured to be able to reciprocate in conjunction with. In addition, an O-ring is attached to the penetrating portion of the valve body 75 of the shaft rod 79, and a seal between the secondary pressure introducing chamber 76 and the primary pressure introducing chamber 77 is secured.

  In the pressure adjustment valve 400 configured in this way, the amount of extension of the pressure adjustment bolt 74 into the spring case 71 is adjusted, and the spring load is adjusted to a set value. The diaphragm 70 is displaced toward the primary pressure introduction chamber 77 by the spring load, and the drain port 78 is in a closed state (initial state).

  Further, when the secondary pressure is introduced into the secondary pressure introduction chamber 76, the pressure in the secondary pressure introduction chamber 76 increases. When the pressure in the secondary pressure introducing chamber 76 exceeds the spring load, the diaphragm 70 is displaced toward the spring case 71 and the drainage port 78 is opened. As a result, the primary pressure introduced into the primary pressure introduction chamber 77 is discharged from the drain port 78. When the pressure in the secondary pressure introduction chamber 76 decreases and is inferior to the spring load, the diaphragm 70 is displaced toward the primary pressure introduction chamber 77, and the drainage port 78 is closed. Thereby, the discharge of the primary pressure from the drainage port 78 is stopped. The pressure regulating valve 400 is a normally closed pressure regulating valve.

  As will be described later, the pressure regulating valve 400 is opened when the pressure of the secondary side pressurized water in the secondary side flow path 33 reaches a predetermined pressure, and serves as a specified pressure setting mechanism for setting the specified pressure of water discharge. Function. And the regulation pressure of water discharge can be adjusted by adjusting a spring load.

Next, the piping system will be described.
One end of the first pipe 60 is connected to the primary flow path 32 of the automatic valve 100 via the start valve 200, and the other end is connected to the working chamber 36 b of the automatic valve 100. The second pipe 61 has one end connected to the secondary flow path 33 of the automatic valve 100 and the other end connected to the secondary pressure introducing chamber 76 of the pressure regulating valve 400. The third pipe 62 branches from the first pipe 60 and is connected to the primary pressure introduction chamber 77 of the pressure regulating valve 400.

  Next, the operation of the automatic valve device configured as described above will be described with reference to FIGS. FIG. 4 is a diagram for explaining the operation of increasing the secondary pressure at the time of water discharge in the automatic valve device according to Embodiment 2 of the present invention, and FIG. FIG. 6 is a diagram for explaining the operation for lowering the secondary side pressure, and FIG. 6 is a diagram for explaining the water discharge stopping operation in the automatic valve device according to Embodiment 2 of the present invention.

  First, in the monitoring state, as shown in FIG. 3, the water control valve 55 is opened by operating the operation handle 56, the stop valve 47 is opened, the automatic drain valve 51 is opened by the atmospheric pressure, and the ball valve 52 is opened. Is closed.

  Next, when the pilot valve 48 or the manual start valve 49 is opened, the primary pressurized water supplied from the main pipe (not shown) into the primary flow path 32 passes through the first pipe 60 and the third pipe 62. Into the primary pressure introduction chamber 77 and filled with water. Further, the primary-side pressurized water flows into the primary pressure inflow chamber 6 from the inflow hole 14, flows into the flow rate adjustment chamber 8 through the communication path 21, and is filled with water. Then, the one-side pressurized water that has flowed into the flow rate adjusting chamber 8 is drained from the drain port 23 through the multistage orifice 24.

  Simultaneously with the opening of the pilot valve 48 or the manual activation valve 49, the primary side pressurized water flows into the working chamber 36b through the first pipe 60 and is filled with water. Thereby, the pressure in the working chamber 36b rises, and the piston 39 moves to the left side in FIG. The moving force of the piston 39 is transmitted to the main valve 37 via the stem 41, and the main valve 37 moves to the left in FIG. 3 against the biasing force of the spring 38. Then, the main valve 37 is separated from the valve seat 34 a, and the primary side pressurized water flows from the primary side flow path 32 into the secondary side flow path 33. Then, as shown in FIG. 4, the primary side pressurized water is filled in the secondary side flow path 33, becomes secondary side pressurized water, flows through the secondary side pipe 45, and is discharged from the water discharge head 46.

  The secondary-side pressurized water in the secondary-side flow path 33 closes the automatic drain valve 51 and is supplied to the secondary pressure introduction chamber 76 of the pressure regulating valve 400 via the second pipe 61. Then, when the pressure of the secondary side pressurized water in the secondary side flow path 33 rises and the pressure in the secondary pressure introduction chamber 76 becomes higher than a predetermined pressure, the pressure regulating valve 400 is opened. Thereby, the primary side pressurized water supplied into the working chamber 36b of the automatic valve 100 through the first pipe 60 is pressure-adjusted through the third pipe 62 and the primary pressure introducing chamber 77 as shown in FIG. The water is discharged from the drain port 78 of the valve 400. Therefore, the pressure in the working chamber 36b decreases, the piston 39 moves to the right side in FIG. 5, and the opening degree of the main valve 37 decreases.

  Next, the opening of the main valve 37 is reduced, and the flow rate of the primary pressurized water flowing from the primary side flow path 32 into the secondary side flow path 33 is reduced. When the pressure of the secondary side pressurized water in the secondary side flow path 33 decreases and the pressure in the secondary pressure introduction chamber 76 becomes lower than a predetermined pressure, the pressure regulating valve 400 is closed as shown in FIG. Is done. As a result, the primary pressurized water is supplied into the working chamber 36b of the automatic valve 100 through the first pipe 60, the pressure in the working chamber 36b rises, and the piston 39 moves to the left in FIG. The opening degree of the valve 37 is increased. Thus, the valve opening / closing operation of the pressure regulating valve 400 is repeated, and the pressure of the secondary side pressurized water is adjusted to a predetermined pressure. Then, the secondary pressurized water adjusted to a predetermined pressure is discharged from the discharge head 46.

  When the water discharge from the water discharge head 46 is finished and the pilot valve 48 and the manual activation valve 49 are closed, the supply of the primary side pressurized water to the working chamber 36b of the automatic valve 100 via the first pipe 60 is stopped. Then, the primary pressurized water in the working chamber 36 b flows through the first pipe 60 and flows into the primary pressure inflow chamber 6 through the inflow hole 14 as shown by an arrow in FIG. It flows into the chamber 8 and drains from the drain port 23 through the multistage orifice 24. The primary pressurized water in the primary pressure introduction chamber 77 flows through the third pipe 62 to the first pipe 60 and is drained from the drain port 23 of the constant flow needle valve 1. Then, the urging force of the spring 38 exceeds the pressure of the primary pressurized water in the working chamber 36b, and the main valve 37 is closed.

  When the main valve 37 is closed, the automatic drain valve 51 is opened, and the residual water in the secondary side pipe 45, the secondary side flow path 33 and the secondary pressure introduction chamber 76 is automatically passed through the second pipe 61. Drained from the drain valve 51.

  Here, since the constant flow needle valve 1 is a normally open type, a part of the primary pressurized water flowing through the first pipe 60 is always drained, but the drainage flow rate from the constant flow needle valve 1 is small, The opening / closing operation of the valve 37 is not affected.

  Next, when checking the opening / closing operation of the automatic valve 100 or checking the setting of the pressure adjusting valve 400, the operation handle 56 is operated to close the water control valve 55. At this time, the automatic drain valve 51 is opened by the atmospheric pressure, and the ball valve 52 is closed. Then, the start valve 200 is operated, the main valve 37 is opened and closed, and the opening / closing operation of the automatic valve 100 is confirmed and the setting of the pressure regulating valve 400 is confirmed.

  In the automatic valve device configured as described above, the constant flow needle valve 1 is disposed on the downstream side of the start valve 200 of the first pipe 60 to constitute a valve closing mechanism of the main valve 37 after the water discharge is stopped.

  In the constant flow needle valve 1, since the flow rate of drainage from the drainage port 23 is constant, if the opening degree of the main valve 37 of the automatic valve 100 is the same, the supply of primary pressurized water into the working chamber 36b of the cylinder 36 is performed. The time from the stop to the closing of the main valve 37 of the automatic valve 100 is constant regardless of the level of the primary pressure. Moreover, since the valve closing speed of the main valve 37 is constant, the occurrence of water hammer that affects the durability of the component parts due to the main valve 37 closing immediately after water discharge is stopped is suppressed, The reliability of the automatic valve device can be increased.

  In the constant flow needle valve 1, the primary pressurized water in the working chamber 36 b is drained from the drain port 23 after the water discharge is stopped. Therefore, it can be confirmed that the main valve 37 is being closed by seeing that the operator is draining from the drain port 23. Further, the operator can confirm that the main valve 37 is closed by observing that the drainage from the drainage port 23 disappears.

  Further, the constant flow needle valve 1 is less prone to foreign matter pinching and product generation between one end of the needle 18 and the inflow hole 14. Occurrence of a problem that the valve closing time becomes long or the main valve 37 cannot be closed is avoided in advance, and stable operation can be realized in the long term.

In the second embodiment, an automatic valve device that does not perform low-pressure water discharge is described as an example. However, the present invention can also be applied to an automatic valve device that performs low-pressure water discharge before specified pressure water discharge. .
In the second embodiment, the constant flow needle valve drains the primary pressurized water in the working chamber of the cylinder after the water stoppage of the automatic valve device installed in the tunnel or the like. However, the present invention is not limited to this, and the same effect can be obtained when applied to the drainage of other equipment.
In the second embodiment, the constant flow needle valve is attached to the branch pipe of the first pipe that supplies the primary pressurized water to the working chamber, but the constant flow needle valve is attached to the first pipe. It is not necessary to do so, and it is sufficient that the primary pressurized water in the working chamber can be drained after stopping the water discharge, and may be directly attached to the working chamber, for example.

  DESCRIPTION OF SYMBOLS 1 Constant flow needle valve, 2 Body, 5 Inflow port, 6 Primary pressure inflow chamber, 7 Reference pressure chamber, 8 Flow rate adjustment chamber, 9 Fit part, 9a Female thread part, 11 Connection nipple, 12 1st cylinder part, 12a 1st Male thread part, 13 Second cylinder part, 14 Inflow hole, 15 Needle support part, 18 Needle, 21 Communication path, 22 Spring, 23 Drain port, 24 Multistage orifice, 31 Body part, 32 Primary side flow path, 33 Secondary side Flow path, 34 partition, 35 communication hole, 36 cylinder, 36b working chamber, 37 main valve, 39 piston, 46 water discharge head, 100 automatic valve.

Claims (5)

Inlet port with the primary fluid entering the primary pressure is introduced through the inlet, the flow regulating chamber, distribution between the flow rate adjusting chamber and drainage port communicating with the outside, and the primary fluid entering the flow amount adjustment chamber A body having a reference pressure chamber provided;
The body is disposed in the body so as to separate the reference pressure chamber and the flow rate adjusting chamber, and is configured to be displaceable to the reference pressure chamber side and the flow rate adjusting chamber side according to the pressure in the flow rate adjusting chamber. A needle support,
One end extending through the partition between the reference pressure chamber and the primary pressure inflow chamber of the body and extending in the primary pressure inflow chamber with the length direction coinciding with the displacement direction of the needle support portion and the inflow A needle that is supported by the needle support part so as to ensure a predetermined gap between the hole and the needle that is displaced so that the one end contacts and separates from the inflow hole in conjunction with the displacement of the needle support part;
A communication path communicating the primary pressure inflow chamber and the flow rate adjustment chamber;
A multi-stage orifice disposed in the drainage port;
A constant flow needle valve comprising: An inflow port having a primary pressure inflow chamber through which the primary pressure flows through the inflow hole, a flow rate adjustment chamber, a drainage port communicating the flow rate adjustment chamber and the outside, and a body having a reference pressure chamber;
A communication path communicating the primary pressure inflow chamber and the flow rate adjustment chamber;
A needle that is displaced so as to be in contact with and away from the inflow hole due to a pressure difference between the reference pressure chamber and the flow rate adjusting chamber;
A multi-stage orifice disposed in the drainage port;
A constant flow needle valve comprising:   The constant flow needle valve according to claim 1 or 2, wherein a diameter of the inflow hole is smaller than a diameter of an orifice constituting the multistage orifice. A fitting portion that is recessed in a cylindrical shape with a bottom at the inflow port and has an internal thread portion formed on the inner peripheral surface;
A bottomed cylindrical first tube portion and a bottomed cylindrical second tube portion having a male thread portion on the outer peripheral surface are connected coaxially, and the inflow hole is formed between the first tube portion and the second tube portion. A connection nipple drilled coaxially in the partition wall between,
The connection nipple, the external thread portion is fixed to the female screw portion, the first to third aspects said primary fluid entering is characterized in that it is constituted by the above-described fitting portion and said first cylindrical portion The constant flow needle valve according to any one of the above. A trunk portion having a primary side flow path and a secondary side flow path partitioned by an isolation wall having a communication hole, a main valve for opening and closing the communication hole from the primary side flow path side, and via the secondary side flow path A cylindrical cylinder projecting from the body portion so as to face the communication hole, and is slidably disposed in the cylinder, and is defined on the opposite side of the secondary flow path in the cylinder. An automatic valve having a piston that opens and closes the main valve in response to the pressure in the working chamber, and is installed in the tunnel and automatically discharges water by supplying pressurized water to the water discharge head connected to the secondary flow path. In the valve device,
5. The automatic valve device according to claim 1, wherein after the water discharge is stopped, the pressure in the working chamber is discharged through the constant flow needle valve according to any one of claims 1 to 4 .

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