Water spraying installation

Abstract

To provide a water spray facility capable of securing a desired low-pressure water discharge time by a setting operation simpler than a conventional one without depending on the length of secondary side piping.SOLUTION: The water spray equipment includes an initial water discharge pressure control valve provided in the secondary piping in order to set the initial water discharge pressure to a pressure lower than the steady water discharge pressure, and further includes a flood responsive valve provided in the secondary piping in order to activate the initial water discharge pressure control valve at the time when flooding of the secondary piping is completed.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a two-stage water spray system. [Background technology]

[0002] In tunnels equipped with water spraying equipment, if a fire breaks out inside the tunnel, the equipment is activated to spray water. However, if the equipment is activated without warning and water spraying begins, visibility may be impaired by the water spray, which could lead to single-vehicle or rear-end collisions between vehicles in the tunnel, or prevent evacuees from evacuating quickly.

[0003] To solve this problem, a two-stage water spray system has been proposed that can start discharging water safely and in a short time by discharging a small amount of water before a full-scale water discharge, with the aim of giving advance warning so as not to confuse drivers and evacuees (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-69344 Summary of the Invention [Problem to be solved by the invention]

[0005] As mentioned above, the two-stage water spray equipment installed inside the tunnel discharges a low-pressure, small-volume water as a preliminary discharge. With the current automatic valve, the initial discharge pressure control valve sets the water filling time + low-pressure water discharge time, and during this set time, the automatic valve opening is maintained small.

[0006] However, with conventional two-stage water spray equipment, the time for which the valve is set to a small opening is determined by the initial setting of the initial water discharge pressure control valve. To give an example, with current models, the upper limit of the set time, determined by the water filling time + low-pressure water discharge time, is 50 seconds. Even if you want to set the low-pressure water discharge time to 10 seconds, if the secondary piping is long and filling takes more than 40 seconds, you won't be able to set a sufficient low-pressure water discharge time.

[0007] Up until now, a setting time limit of 50 seconds has been sufficient for automatic valve installation positions. However, it is expected that automatic valve installation positions will become farther away in the future. Furthermore, even if the setting range for the setting time is expanded beyond 50 seconds, it will not be possible to accommodate situations where the automatic valve installation position becomes even farther away. Furthermore, expanding the setting range raises concerns that it will lead to an increase in the size of the equipment.

[0008] Furthermore, with the current product, it was necessary to initially set the initial water discharge pressure control valve according to the length of the secondary piping, and to set the water filling time + low-pressure water discharge time, which required individual setting operations for each automatic valve.

[0009] The present disclosure has been made to solve the above-mentioned problems, and aims to provide water spray equipment that can be set up more easily than conventional equipment, regardless of the secondary piping length, and that can ensure the desired low-pressure water discharge time. [Means for solving the problem]

[0010] The water spray equipment of the present disclosure is a water spray equipment equipped with an initial water discharge pressure control valve provided in the secondary piping in order to set the initial water discharge pressure to a pressure lower than the steady-state water discharge pressure, and further equipped with a water filling sensing valve provided in the secondary piping in order to activate the initial water discharge pressure control valve when water filling into the secondary piping is completed. [Effects of the Invention]

[0011] According to the present disclosure, it is possible to obtain a water spraying facility that can be set up more easily than conventional facilities without depending on the length of the secondary piping, and that can ensure the desired low-pressure water discharge time. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is an explanatory diagram showing the operating states of each mechanism during monitoring corresponding to step S1 in the two-stage water-discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 2] FIG. 10 is an explanatory diagram showing the operating states of each mechanism at the time of startup, which corresponds to step S2, for the two-stage water-discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 3] FIG. 10 is an explanatory diagram showing the operating states of each mechanism during the filling of pipes with water, which corresponds to step S3, in the two-stage water-discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 4] FIG. 10 is an explanatory diagram showing the operating states of each mechanism at the time of completion of filling and low-pressure water discharge, which corresponds to step S4, in the two-stage water-discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 5] FIG. 10 is an explanatory diagram showing the operating states of each mechanism during specified pressure water discharge, which corresponds to step S5, in the two-stage water discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 6] FIG. 10 is an explanatory diagram showing the operating states of each mechanism during restoration corresponding to step S6 in the two-stage water-discharge type water spray equipment according to the first embodiment of the present disclosure. [Figure 7] FIG. 10 is an explanatory diagram showing the operating state of each mechanism during monitoring, which corresponds to step S101, in a conventional two-stage water spray system. [Figure 8] FIG. 10 is an explanatory diagram showing the operating states of each mechanism at the time of startup, which corresponds to step S102, in a conventional two-stage water spraying system. [Figure 9] FIG. 10 is an explanatory diagram showing the operating state of each mechanism during low-pressure water discharge, which corresponds to step S103, in a conventional two-stage water spray equipment. [Figure 10]FIG. 10 is an explanatory diagram showing the operating state of each mechanism when water is discharged at a specified pressure, which corresponds to step S104, in a conventional two-stage water spraying system. [Figure 11] FIG. 10 is an explanatory diagram showing the operating state of each mechanism during recovery, which corresponds to step S105, in a conventional two-stage water spray system. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, preferred embodiments of the water spray equipment of the present disclosure will be described with reference to the drawings. The water spray equipment disclosed herein has a technical feature in that, when performing two-stage water spraying, a water filling sensing valve is provided in the secondary piping to activate the initial water discharge pressure control valve when water filling into the secondary piping is complete.

[0014] In this disclosure, the state in which a pipe is filled with water is referred to as "filling," and the term "filling" is also used when the pipe in question is not a closed pipe but has an open end.

[0015] Embodiment 1 First, the configuration of a conventional two-stage water-discharge type water spray equipment will be described using Figures 7 to 11, and then the configuration of a two-stage water-discharge type water spray equipment according to the present disclosure will be described using Figures 1 to 6.

[0016] The water spraying operation using conventional two-stage water spray equipment can be broadly divided into the following five steps. Step S101: Operation status of each mechanism during monitoring Step S102: Operational status of each mechanism at startup Step S103: Operation status of each mechanism during low-pressure water discharge Step S104: Operation status of each mechanism during specified pressure water discharge Step S105: Operation status of each mechanism at the time of recovery

[0017] 7 is an explanatory diagram showing the operating state of each mechanism during monitoring, which corresponds to step S101, in a conventional two-stage water spray system. The conventional two-stage water spray system is configured with the following main mechanisms: main valve 10, initial water discharge pressure control valve 20, pressure adjustment valve 30, pilot valve 51, manual start valve 52, automatic drain valve 61, and test water discharge valve 62.

[0018] Figure 7 shows the operating state of each mechanism during fire monitoring, which corresponds to the state when water spraying by the two-stage water discharge system is not being performed. In other words, in Figure 7, water is not being discharged from the secondary side of the valve 10.

[0019] 8 is an explanatory diagram showing the operating states of each mechanism at the time of startup, which corresponds to step S102, of a conventional two-stage water spray system. At startup, the pilot valve 51 or the manual start valve 52 is opened, causing the primary pressurized water PW1 to pressurize the interior of the cylinder chamber 11, the initial water discharge pressure control valve 20, and the pressure adjustment valve 30, and the valve element 1 in the valve 10 begins to move in the opening direction.

[0020] 9 is an explanatory diagram showing the operating state of each mechanism of a conventional two-stage water spraying system during low-pressure water discharge, which corresponds to step S103. During low-pressure water discharge, which corresponds to the first stage of the two-stage water discharge, the cylinder chamber 11 is pressurized, causing the valve element 1 to move in the opening direction.

[0021] At this time, when the valve element 1 is opened to a position where it is released from the adjuster 12, pressurized water is discharged from the bottom of the initial water discharge pressure control valve 20 via the adjuster 12, the opening of the valve element 1 is kept constant, and the supply of pressurized water to the secondary side of the valve 10 is restricted, resulting in low-pressure water discharge. In other words, low-pressure water discharge equivalent to the first stage of two-stage water discharge is performed from the secondary side of the valve 10.

[0022] On the other hand, in the initial water discharge pressure control valve 20, the pressurizing chamber 22 provided in the upper part is pressurized, the spring 23 is compressed by the downward movement of the movable body 24, and the valve body 2 is lowered by the repulsive force thereof.

[0023] At this time, the speed at which the valve element 2 descends is adjusted by the resistance of the silicone oil 26 passing through the orifice 25 of the valve element 2, and the time until the valve element 2 closes, that is, the low-pressure water discharge time, is secured.

[0024] 10 is an explanatory diagram showing the operating state of each mechanism of a conventional two-stage water spray system when water is discharged at a specified pressure, which corresponds to step S104. During the specified pressure discharge, which corresponds to the second stage of two-stage water discharge, the low-pressure water discharge time has elapsed, and valve element 2 of initial water discharge pressure control valve 20 closes, thereby preventing the discharge of pressurized water from cylinder chamber 11. As a result, valve element 1 moves in the opening direction again, and the pressure on the secondary side of valve 10 increases.

[0025] As a result, pressurized water on the secondary side of the valve 10 is introduced into the diaphragm chamber 32 of the pressure regulating valve 30, and the secondary pressure is adjusted by changing the opening of the valve element 3 in response to fluctuations in the secondary pressure. In this way, water is discharged from the secondary side of the valve 10 at a specified pressure corresponding to the second stage of the two-stage water discharge.

[0026] 11 is an explanatory diagram showing the operating states of each mechanism during recovery, corresponding to step S105, of a conventional two-stage water spray system. After the two-stage water discharge is completed, the open pilot valve 51 or manual start valve 52 is closed, stopping the supply of primary-side pressurized water PW1. As a result, the pressurized water that had been supplied to each section is drained to the secondary side of the main valve 10 via the needle valve 33 of the pressure regulating valve 30.

[0027] As a result, valve element 1, valve element 2, valve element 3, and movable element 24 return to the same positions as those during monitoring shown in Figure 7, and main valve 10 closes. Note that residual water on the secondary side of main valve 10 is drained from automatic drain valve 61 and test discharge valve 62 (manual).

[0028] In a conventional two-stage water spray system that operates in this manner, the low-pressure water discharge time ensured in step S103 shown in Figure 9 depends on the length of the secondary piping, and if the length of the secondary piping becomes long, there is a risk that the desired low-pressure water discharge time cannot be ensured. In other words, if the initial water discharge pressure control valve 20 closes while the secondary piping is being filled with water, water will be discharged at the specified pressure instead of at a low pressure.

[0029] Therefore, a specific configuration of a two-stage water-discharge type water spraying facility according to the present disclosure that can solve such problems will be described with reference to FIGS. 1 to 6. FIG.

[0030] The water spraying operation by the two-stage water discharge type water spraying equipment according to the present disclosure can be broadly divided into the following six steps. Step S1: Operation status of each mechanism during monitoring Step S2: Operational status of each mechanism at startup Step S3: Operation status of each mechanism when filling the pipes with water Step S4: Operation status of each mechanism when filling is complete and low-pressure water is discharged Step S5: Operation status of each mechanism during specified pressure water discharge Step S6: Operation status of each mechanism at the time of recovery

[0031] 1 is an explanatory diagram showing the operating states of each mechanism during monitoring corresponding to step S1 in a two-stage water discharge type water spray system according to embodiment 1 of the present disclosure. The two-stage water discharge type water spray system according to embodiment 1 includes, as its main mechanisms, a main valve 10, an initial water discharge pressure control valve 20, a pressure adjustment valve 30, a pilot valve 51, a manual start valve 52, an automatic drain valve 61, and a test water discharge valve 62, and further includes a water filling sensing valve 40.

[0032] Figure 1 shows the operating state of each mechanism during fire monitoring, which corresponds to the state when water spraying by the two-stage water discharge system is not being performed. In other words, in Figure 1, water is not being discharged from the secondary side of this valve 10.

[0033] The water filling sensitive valve 40, which is a characteristic component of the two-stage water discharge type water spray equipment of this embodiment 1, is connected to the primary side piping upstream of the initial water discharge pressure control valve 20, and is connected to the secondary side piping downstream of the pressure regulating valve 30, as shown in Figure 1.

[0034] In addition, in the operating state during monitoring shown in Figure 1, the water filling sensitive valve 40 is not yet functioning, which is essentially the same as the operating state of the conventional two-stage water discharge type water spray equipment described above in Figure 7.

[0035] 2 is an explanatory diagram showing the operating states of each mechanism at startup, which corresponds to step S2, for the two-stage water-discharge water spray equipment according to the first embodiment of the present disclosure. At startup, pilot valve 51 or manual start valve 52 is opened, causing primary-side pressurized water PW1 to pressurize the interior of cylinder chamber 11, initial water-discharge pressure control valve 20, and pressure adjustment valve 30. Here, because the amount of water discharged from water filling sensing valve 40 is less than the amount of water supplied to cylinder chamber 11, cylinder chamber 11 is pressurized, and valve element 1 in valve 10 begins to move in the opening direction.

[0036] 2, the diaphragm 41 is in a lowered state because the secondary-side pressurized water PW2 is not being supplied to the fill-sensitive valve 40. Therefore, the primary-side pressurized water PW1 supplied to the fill-sensitive valve 40 is drained from the fill-sensitive valve 40. At this time, the initial discharge pressure control valve 20 is not supplied to the pressurization chamber 22 provided above it because the pressurized water for pressurizing the pressurization chamber 22 is drained by the fill-sensitive valve 40. As a result, the initial discharge pressure control valve 20 does not start up in the state shown in FIG. 2.

[0037] 3 is an explanatory diagram showing the operating states of each mechanism when the pipes are filled with water, which corresponds to step S3, in the two-stage water spray system according to the first embodiment of the present disclosure. When the pipes are filled with water as shown in FIG. 3, the cylinder chamber 11 is further pressurized by the primary-side pressurized water PW1, causing the valve element 1 to move further in the opening direction.

[0038] At this time, when the valve element 1 is opened to a position where it is released from the adjuster 12, pressurized water is drained from the bottom of the initial water discharge pressure control valve 20 via the adjuster 12. As a result, the opening of the valve element 1 can be kept constant, the supply of pressurized water to the secondary side of the valve 10 is restricted, and after the secondary side is filled with water, low-pressure water discharge begins.

[0039] On the other hand, the pressurized water for pressurizing the pressurization chamber 22 provided at the upper part of the initial water-discharge pressure control valve 20 is not supplied to the pressurization chamber 22 because it is drained by the water-filling sensitive valve 40. As a result, the initial water-discharge pressure control valve 20 does not start up in the state shown in FIG.

[0040] 4 is an explanatory diagram showing the operating states of each mechanism during the completion of filling and low-pressure water discharge, which corresponds to step S4, of the two-stage water spray system according to the first embodiment of the present disclosure. When filling of the secondary piping is completed and low-pressure water discharge begins, the opening diameter of the water spray head (not shown) generates low-pressure water discharge pressure in addition to the hydraulic head pressure. When the secondary piping pressure rises, the diaphragm 41 of the water filling sensitive valve 40 is pushed up by the secondary-side pressurized water PW2, and the associated valve element 4 closes.

[0041] As a result, the discharge of the primary pressurized water PW1 from the water filling sensitive valve 40 stops, the pressurizing chamber 22 provided above the initial water discharge pressure control valve 20 is pressurized by the pressurized water, and the movable body 24 descends.

[0042] Furthermore, the descent of the movable body 24 compresses the spring 23, and the repulsive force of this compresses the valve body 2. At this time, the descent speed of the valve body 2 is adjusted by the resistance of the silicone oil 26 passing through the orifice 25 of the valve body 2, ensuring the low-pressure water discharge time.

[0043] The initial position of the movable body 24 can be changed by the adjustment bolt 21, and by adjusting the position of the adjustment bolt 21, a desired low-pressure water discharge time can be set.

[0044] 5 is an explanatory diagram showing the operating states of each mechanism during the specified pressure water discharge corresponding to step S5 in the two-stage water discharge type water spray equipment according to the first embodiment of the present disclosure. When the low-pressure water discharge time has elapsed and the valve element 2 of the initial water discharge pressure control valve 20 closes, the pressurized water in the cylinder chamber 11 stops being discharged. As a result, the valve element 1 moves in the opening direction again, and the pressure on the secondary side of the valve 10 increases.

[0045] As a result, pressurized water on the secondary side of this valve 10 is introduced into the diaphragm chamber 32 of the pressure regulating valve 30, and the opening of the valve element 3 changes in response to fluctuations in the secondary side pressure, thereby adjusting the discharge amount from the pressure regulating valve 30 and regulating the secondary side pressure. In this way, water is discharged from the secondary side of this valve 10 at a specified pressure, which corresponds to the second stage of two-stage water discharge.

[0046] The secondary pressure can be adjusted to a desired value by adjusting the position of the adjusting bolt 31.

[0047] 6 is an explanatory diagram showing the operating states of each mechanism during recovery corresponding to step S6 in the two-stage water spray system according to the first embodiment of the present disclosure. After the two-stage water discharge is performed, the open pilot valve 51 or manual start valve 52 is closed, thereby stopping the supply of primary-side pressurized water PW1. As a result, the pressurized water that had been supplied to each section is drained to the secondary side of the main valve 10 via the needle valve 33 of the pressure regulating valve 30.

[0048] As a result, valve element 1, valve element 2, valve element 3, and movable element 24 return to the same positions as those during monitoring shown in Figure 1 above, and main valve 10 closes. Note that any remaining water on the secondary side of main valve 10 is drained from automatic drain valve 61 and test discharge valve 62 (manual).

[0049] The features of the two-stage water-discharge type water spray equipment according to the first embodiment that operates in this way can be summarized as follows:

[0050] The pressure applied to the secondary side of the automatic valve during water filling is equal to the water head. When water reaches the water spray head and low-pressure water discharge starts, a low-pressure water discharge pressure is generated in the pipe, and the water head pressure + low-pressure water discharge pressure is applied to the automatic valve. Therefore, in the two-stage water discharge type water spray facility according to the first embodiment, by further providing a water filling sensitive valve 40, it is configured to sense this change in water discharge pressure and start counting the low-pressure water discharge time at this timing.

[0051] Specifically, by adding a water filling sensitive valve 40 that monitors the secondary pressure, during water filling, the pressurized water supplied to the initial water discharge pressure control valve 20 is drained from the water filling sensitive valve 40, and then, when the secondary pressure exceeds a certain pressure, the supply of pressurized water to the initial water discharge pressure control valve 20 is started.

[0052] In other words, the water filling sensitive valve 40 according to the first embodiment has the following "drainage structure" and "pressurized water supply structure".

[0053] <Drainage structure> The water filling sensitive valve 40 has a drainage structure that drains the pressurized water for supplying the pressurized chamber 22 of the initial water discharge pressure control valve 20 until the water filling of the pressurized water supplied to the secondary side pipe of this valve 10 is completed and the secondary side pipe pressure reaches a preset pressure threshold.

[0054] <Pressurized water supply structure> Furthermore, the water filling sensitive valve 40 has a pressurized water supply structure that stops drainage when the secondary side pipe pressure of this valve 10 reaches the pressure threshold and supplies pressurized water (primary side pressure water PW1) to the pressurized chamber 22 of the initial water discharge pressure control valve 20 to activate the initial water discharge pressure control valve 20.

[0055] Also, as the pressure threshold, it can be set within the range that satisfies the following formula (1). Maximum water head pressure < pressure threshold ≤ (water head pressure + low-pressure water discharge pressure value) (1)

[0056] As an example of the settings regarding the pressure during low-pressure water discharge and the pressure during this water discharge, the following specific examples can be given. If the maximum head pressure generated during filling is 0.04 MPa, When discharging water at low pressure, the initial discharge pressure is 0.04MPa (head pressure + low discharge pressure 0.06MPa = 0.1MPa). During the actual discharge, the steady discharge pressure is 0.38MPa (head pressure 0.04MPa + actual discharge pressure 0.34MPa).

[0057] In this specific example, the difference between the head pressure and the initial discharge pressure is 0.06 MPa, eliminating the need to set the pressure threshold of the water filling sensitive valve 40 for each automatic valve. Meanwhile, the initial discharge pressure control valve 20 can fix the low-pressure water discharge time to a desired value (for example, 10 seconds) by adjusting the initial position of the adjustment bolt 21, regardless of the secondary piping length, thanks to the action of the water filling sensitive valve 40. This means that the setting can be made in advance regardless of the installation location of the valve 10, significantly reducing the setting work.

[0058] In addition, the water filling sensitive valve 40 can be configured as a pressure sensor + motor-operated valve to realize a "drainage structure" and a "pressurized water supply structure."

[0059] As described above, according to the first embodiment, when performing two-stage water spraying, the secondary piping is provided with the water filling sensitive valve 40 in order to activate the initial water discharge pressure control valve 20 when the secondary piping is completely filled with water. As a result, a water spray system can be realized that can ensure the desired low-pressure water discharge time with a setting operation that is simpler than conventional systems, regardless of the length of the secondary piping. [Explanation of symbols]

[0060] 1-4 Valve body, 10 Main valve, 11 Cylinder chamber, 12 Adjuster, 20 Initial water discharge pressure control valve, 21 Adjusting bolt, 22 Pressurizing chamber, 23 Spring, 24 Movable body, 25 Orifice, 26 Silicone oil, 30 Pressure regulating valve, 31 Adjusting bolt, 32 Diaphragm chamber, 33 Needle valve, 40 Water filling sensing valve, 41 Diaphragm, 51 Pilot valve, 52 Manual start valve, 61 Automatic drain valve, 62 Test water discharge valve, PW1 Primary pressure water, PW2 Secondary pressure water.

Claims

1. A water spraying system equipped with an initial water discharge pressure control valve provided in the secondary piping to set the initial water discharge pressure lower than the steady water discharge pressure, A water filling sensing valve provided in the secondary piping to activate the initial water discharge pressure control valve when the filling of the secondary piping is completed. Further provided is a water spraying facility.

2. The filling sensitive valve is a drainage structure for draining the pressurized water to be supplied to the pressurization chamber of the initial water-discharge pressure control valve until the filling of the pressurized water flowing through the secondary-side piping is completed and the secondary-side piping pressure reaches a predetermined pressure threshold; a pressurized water supply structure that stops the drainage when the secondary side piping pressure reaches the pressure threshold value, and starts the initial water discharge pressure control valve by supplying the pressurized water to a pressurization chamber of the initial water discharge pressure control valve; The water spraying system according to claim 1, comprising:

3. The pressure threshold is calculated by the following formula: Maximum head pressure < pressure threshold ≦ (head pressure + low-pressure discharge pressure value) is set within a range that satisfies The water spraying installation according to claim 2.

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