JP2007143918A - Check valve for firefighting equipment, and check valve unit for firefighting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve for firefighting equipment and a check valve unit for the firefighting equipment, by which in-pipe pressure loss is reduced relative to water for firefighting to be supplied to the firefighting equipment arranged in a construction product such as a building, the water for firefighting is efficiently and safely supplied by a small pump capacity, assembling and disassembling are excellently performed, components are easily exchanged, and maintenance and management are facilitated. <P>SOLUTION: The one end of the check valve for the firefighting equipment is obtained as follows. A valve case 3 is removably attached to the inner part of a conduit pipe 2 connected between the water supply piping 1, 1' of a water supply piping system P, has a plurality of distribution holes 4 on the outer periphery, and includes a support member 7 at the rear end, where a plurality of water flow holes 5 and a center sliding hole 6 are opened. A rod 10 includes a valve body 8 slidable in a long axis direction X so as to be opened/closed by contact/separation at a valve seat part 3a; and an attachment member K at the rear end, which is slidably inserted at one end to the sliding hole 6 and attachable to the rear part of the support member. Coiled spring materials 11 are held between the valve body and the support member so as to allow the valve body to be abutted onto the valve seat part 3a and to perform energization in a closing direction. The rod 10 and the coiled spring material 11 are arranged inside the valve case 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a check valve for a fire extinguishing equipment and a check valve unit for a fire extinguishing equipment, for example, a small pump capacity with a small pressure loss in a pipe with respect to fire extinguishing water supplied to a fire extinguishing equipment provided in a building such as a building or a condominium. Efficiently and safely, firefighting water can be supplied quickly and reliably, even on high floors, and it can be easily assembled and disassembled at the desired location in the water supply piping system, making it easy to replace and replace parts. Therefore, it is intended to prevent the backflow of fire-fighting water reliably and to make maintenance and management excellent.

  For buildings such as buildings and condominiums, a water supply piping system for supplying fire-fighting water to the building in advance is installed as a facility for initial fire extinguishment at the time of a fire, and fire-fighting water is always stored on the rooftop and underground By providing this water storage tank, it was used for the initial fire extinguishing by the provided water discharge hose stored in the box provided for each level. In addition, even if the fire-fighting water stored in the water storage tank is not enough, fire-fighting water is supplied to the fire extinguishing equipment at the outlet of the desired floor through the water supply piping system provided in the building by driving the pump of the fire pump. By doing so, fire fighting activities are carried out at each level.

  In this way, it is obliged that a connected water supply pipe facility be provided in the water supply piping system that is attached to the building and supplies fire-fighting water. Conventionally, for example, a check valve that prevents backflow to a water supply source, a water stop valve that opens and closes a water supply path, and a primary side (inflow side) or a secondary side with respect to the check valve. Some have a drain valve provided on the (outflow side) connected to a water supply piping system and provided in a storage case with a lid. And, the check valve of this connected water pipe equipment is formed in a double pipe structure in which a support cylinder is integrally formed with a short diameter pipe through a radial connecting wall. is doing. In addition, a valve rod attached to one end of the valve body is slidably inserted into the support cylinder, and the disc-shaped valve receives the urging force of a coil spring of the same diameter fitted on the outer periphery of the valve rod. The check valve unit is configured to be closed by pressing a body against a valve seat wall protruding on the inner circumference on the upstream side of the short pipe.

  When the pump of the fire fighting pump automobile is driven to supply fire extinguishing water in use and high water pressure is applied from the water supply source, the valve body of the check valve unit resists the urging force of the coil spring. The fire-extinguishing water is sent to the water supply piping system downstream. In addition, when the pump is stopped or the water supply source becomes low pressure, the valve rod slides in the support cylinder by the biasing force of the coil spring, and the valve body is pressed against the valve seat wall of the short pipe and closed. It is intended to prevent backflow by being valved.

In addition, the drain valve provided on the primary side with respect to the check valve is opened after the extinction of the fire, thereby releasing air mixed in the pipe on the primary side with respect to the check valve. The pressure is increased, and the hose connection fitting from the fire pump car attached to the water supply port for the water supply pipe is prevented from becoming difficult to remove due to the occurrence of negative pressure in the pipe. In addition, the drainage valve provided on the secondary side is opened when, for example, construction of a water discharge facility installed inside the building is performed, so that water or air remaining in the primary side pipe is removed. (For example, refer to Patent Document 1).
Japanese Patent No. 3254182

  However, the check valve of the above-described conventional connected water pipe structure described in Patent Document 1 is such that the short pipe itself of the check valve unit connected to the water distribution pipe buried in the ground has a radial connecting wall inside. A double-pipe structure in which a support cylinder is integrally formed with a large-diameter base end connected thereto. The disc-shaped valve body is closed by being pressed against the valve seat wall projecting on the inner circumference on the upstream side of the short pipe under the urging force of the coil spring fitted on the outer circumference of the support cylinder. Therefore, the pumps of pumps and fire pumps connected to the water storage tanks are driven, and high water pressure is applied from the water supply source to open the valve. The pressure loss in the pipe is large, and it takes a lot of time to send fire-fighting water. The discharge pressure of the fire-fighting water from the water discharge facilities installed on each floor of the building is below the limit stipulated by the Fire Service Law, and is necessary for fire fighting. Sufficient ejection pressure could not be obtained, and it was unsuitable for quick and reliable initial fire extinguishing. Therefore, the supply of fire-fighting water requires large-capacity pumps and firefighting pumps. The higher the building, the more time it takes to supply fire-fighting water, and the larger the capacity of pumps and other pumps. I was trying. In addition, the internal pressure in the water distribution pipe and the connected water supply pipe becomes extremely high, and an excessive load is applied in the check valve unit. Therefore, mechanical fatigue of parts such as the valve body, the support cylinder, and the coil spring is severe. The lifetime was short. For this reason, check valves, water stop valves, water distribution valves, etc., cause malfunctions, frequently require replacement with new parts, and require a great deal of maintenance and management. . In addition, the pipe system was ruptured and water leaked from each pipe end connection.

  Moreover, since the check valve of the above-mentioned conventional connected water supply pipe facility described in Patent Document 1 has a large pressure loss in the pipe to supply the water for fire extinguishing, the pump of the pumping pump or the fire pump car is driven, In addition, when the valve body is closed by the biasing force of the coil spring, for example, when the pumps are stopped, the sliding movement of the valve rod with respect to the support cylinder fluctuates in response to the water pressure of the fire-extinguishing water that changes in small increments. Since it is easy to move, becomes uneven, or becomes unstable without being smoothly performed, the valve opening or closing operation of the valve body is not performed with high accuracy and is uncertain. For this reason, the supplied water for fire extinguishing causes pulsation, and it has not been possible to reliably prevent the backflow as the original function of the check valve.

  Further, in the above-described conventional connected water supply pipe facility described in Patent Document 1, for example, as described above, the check valve includes a coil spring on the outer periphery of a support cylinder that is integrally connected to the inside of the short pipe via a connecting wall. Since it is configured to be externally fitted and accommodated, it requires a lot of time and labor to assemble the coil spring and valve body to the support cylinder under a narrow space in the short pipe. It cannot be done easily. Moreover, once assembled, disassembly work at the time of maintenance and inspection at the construction site and replacement work with new parts cannot be easily performed.

  The present invention solves the drawbacks of the check valve found in the above cited reference 1, the pressure loss in the pipe for the fire-extinguishing water flowing from the primary side to the secondary side is small, and the fire-extinguishing water is efficiently used even with the driving force of a small capacity pump. Even if the water is well fed and the building is high-rise, the fire-fighting water is supplied from a water outlet that is stored in a box provided for each floor, and a predetermined volume is constantly supplied at a predetermined pressure without causing pulsation. The fire can be reliably extinguished, and the sliding movement of the valve body is uniformly stable against the water pressure of the fire extinguishing water, so that the valve opening or closing operation can be performed with high accuracy and reliability. The pressure loss is small, the components are not overloaded, the components are less mechanically fatigued, the life is extended, the cause of failure is eliminated, and the pipe system is ruptured and water leakage from the pipe end connection is suppressed. To prevent backflow, and to make and assemble Easy to install and lay on site, easy to disassemble for maintenance and inspection, easy and reliable replacement with new parts, and a robust structure for fire extinguishing equipment An object is to provide a check valve unit for a stop valve and a fire extinguishing equipment.

This invention is made | formed in view of the said subject, The invention of Claim 1 is
In a check valve for fire extinguishing equipment that is installed at a desired location in the water supply piping system and prevents reverse flow of fire fighting water to the water supply source,
A water distribution pipe connected to a desired position between the water supply pipes on the primary side and the secondary side;
One end of the primary side is removably attached to the water distribution pipe, the overall shape is cylindrical, and there are a plurality of flow holes on the outer periphery, and a plurality of water flow holes and a center are provided at the rear end of the secondary side. Has a valve case provided with a support member having a sliding hole, and
A valve body provided in the valve case so as to be slidable in the axial direction, and opened and closed by contacting and leaving a valve seat provided on the inner periphery of the valve case on the primary side;
A valve rod provided at the rear end with an attachment member that is slidably inserted into a sliding hole in the support member at one end and can be attached to the back of the support member;
A winding spring material interposed between the valve body and the support member, and energizing the valve body in a closing direction by always contacting the valve seat of the valve case;
It is provided with.

  The invention according to claim 2 of the present invention is that, in claim 1, the valve case is formed in the water distribution pipe so that the outer peripheral diameter is gradually decreased from the primary side to the secondary side. Features.

  Further, in the invention according to claim 3 of the present invention, in any one of claims 1 and 2, a substantially conical cap is formed on the front surface of the valve body facing the water supply source. Features.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the valve rod is extended from the valve body, and the attachment member is a tip of the valve rod. It is a flat screw head of a set screw into which a portion is screwed.

Moreover, the invention according to claim 5 of the present invention is any one of claims 1 to 3,
The valve rod is separated from the valve body through an allowance and formed into a cylindrical shape having a length approximately half of the axial length of the valve case, and the attachment member is a hook-like shape provided on the outer periphery of the other end of the valve rod. The valve body is slidably inserted into the valve rod, and the valve body is supported so as to be able to abut against the valve rod by a set screw whose tip is screwed into the valve body. It is characterized by.

  The invention according to claim 6 of the present invention is characterized in that, in any one of claims 1 to 5, the wound spring material is a bamboo spring.

Further, the invention described in claim 7 of the present invention is a check valve unit for a fire extinguishing equipment that is installed at a desired location of a water supply piping system and prevents a reverse flow of fire extinguishing water to a water supply source.
One end of the primary side is removably attached to the water pipe connected to a desired position between the primary side and secondary side water supply pipes, the overall shape is cylindrical, and there are a plurality of flow holes on the outer periphery. A valve case to which a support member having a plurality of water holes and a sliding hole at the center is attached at the rear end of the secondary side;
A valve body provided in the valve case so as to be slidable in the axial direction, and opened and closed by contacting and leaving a valve seat provided on the inner periphery of the valve case on the primary side;
A valve rod provided at the rear end with an attachment member that is slidably inserted into the sliding hole of the support member at one end and can be attached to the back of the support member;
A winding spring material interposed between the valve body and the support member, and energizing the valve body in a closing direction by always contacting the valve seat of the valve case;
It is characterized by comprising.

  The present invention has a small pressure loss in the pipe with respect to the fire-fighting water flowing from the primary side to the secondary side, efficiently delivers the fire-fighting water even with the driving force of a small-capacity pump, Fire extinguishing water is supplied from a built-in water discharge hose stored in a provided box to supply fired water at a constant pressure at a constant pressure without causing pulsation. Is stable against the water pressure of fire-extinguishing water, and the valve opening or closing operation can be performed with high accuracy and reliability, the pressure loss in the pipe is small, and the components are overloaded. Therefore, the mechanical fatigue of the parts is reduced, the service life is extended, the cause of the failure is eliminated, the rupture of the pipe system and the water leakage from the pipe end connection part are suppressed, and the backflow is surely prevented. For easy installation, laying, etc. Excellent workability, yet also exploded at the time of maintenance and inspection be easy to exchange work with the new parts easily and reliably performed, resulting in the structure robust.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a partially cutaway sectional view showing Embodiment 1 of a check valve for fire fighting equipment according to the present invention, FIG. 2 is a partially cutaway sectional view showing a state in which the valve body of the check valve for fire fighting equipment is fully opened, FIG. FIG. 4 is a rear view of the check valve for fire fighting equipment, and FIG. 4 is a circuit diagram of a water pipe system showing an example of a construction state of the check valve for fire fighting equipment of the first embodiment.

  The present embodiment 1 is installed at a desired location between the water supply pipes 1, 1 ′ forming the water supply pipe system P, and in the check valve A for the fire extinguishing equipment that prevents the reverse flow of the fire water W to the water supply source I, the water supply source A water distribution pipe 2 connected to a desired position between the water supply pipes 1 and 1 ′ on the primary side serving as I and the secondary side serving as the water supply destination O, and one end detachably attached to the primary side in the water distribution pipe 2 A support member having a cylindrical shape as a whole, a plurality of flow holes 4 on the outer periphery, a plurality of flow holes 5 at the rear end of the secondary side, and a sliding hole 6 at the center. 7 and a valve seat 3 provided in the valve case 3 so as to be slidable in the axial direction X, and contacted and separated from a valve seat 3a provided on the inner periphery of the primary side of the valve case 3. And the attachment member K that is slidably inserted into the sliding hole 6 in the support member 7 and can be attached to the back portion of the support member 7. It is interposed between the valve rod 10 provided at the rear end, the valve body 8 and the support member 7, so that the valve body 8 is always brought into contact with the valve seat portion 3 a of the valve case 3 and closed. And an urging spring material 11 to be urged.

  In the first embodiment, as illustrated, the valve rod 10 extends from the valve body 8, and one end thereof is slidably inserted into the sliding hole 6 as described above.

  Further, in the first embodiment, the attachment member K that can be attached to the back portion of the support member 7 is a flat screw head 9 a of a set screw 9 having a tip screwed into the rear end of the valve rod 10.

  In addition, the check valve A for fire extinguishing equipment according to the first embodiment is installed at a desired location with respect to the water supply pipes 1 and 1 'of the water supply piping system P in the connected water supply pipe, and the fire fighting water W to the water supply source I A stop valve mechanism B that opens and closes the water supply piping system P for the fire fighting water W and a drain valve mechanism C provided on the primary side or the secondary side with respect to the check valve A for the fire extinguishing equipment. However, the arrangement order of these is shown in FIG. 4 as a representative example, and can be freely set.

  In addition, the water distribution pipe 2 is, as a suitable example of the first embodiment, a valve body 8, a valve rod 10, and a support member that are assembled in the valve case 3 as components constituting the check valve A for fire extinguishing equipment. 7. In the preferred example shown in order to assemble component parts such as the wound spring material 11 in the construction site as well as in the factory, and to disassemble the parts easily and reliably, and to easily replace the parts, for example, 350 to 380 mm Tube members are optimally used.

  Further, the valve case 3 according to the first embodiment is arranged in the water distribution pipe 2 so that the outer peripheral diameter is gradually reduced from the primary side to the secondary side. As described above, the valve case 3 is formed so that the outer peripheral diameter gradually decreases from the primary side to the secondary side and is arranged in the water distribution pipe 2. The water pressure of the fire extinguishing water W from the primary side In response, when the valve body 8 is opened and the fire-extinguishing water W flows into the distribution pipe 2, a part of the fire-extinguishing water W is valved through a plurality of flow holes 4 provided on the outer periphery of the valve case 3. The water is distributed on the outer peripheral side of the case 3 on the average and flows out of the water distribution pipe 2. At this time, the resistance of the fire-extinguishing water W flowing on the secondary side is reduced to reduce the pressure loss in the pipe, and the fire-extinguishing water W This is to quickly spill out.

  Reference numeral 8a denotes a substantially conical cap formed on the front surface of the valve body 8 so as to face the water supply source I. The cap 8a is formed in a substantially conical shape in this manner so that the water for fire extinguishing flowing through the water supply pipe 1 is used. When the valve body 8 is opened by receiving the water pressure of W, the fire-extinguishing water W flowing into the fire-extinguishing equipment check valve A is distributed to the periphery along the substantially conical circumferential side surface of the cap 8a. This is because the pressure loss is reduced when the gas flows into the fire extinguishing equipment check valve A on average, and the valve body 8 is opened and closed with high accuracy and smoothly.

  8b is an annular sealing material fitted on the outer periphery of the valve body 8. The sealing material 8b is formed of a flexible material such as rubber or synthetic resin, and is formed on the inner periphery of the valve case 3 on the primary side. The valve body 8 seated on the provided valve seat portion 3a is made highly watertight with respect to the fire-fighting water W so as to eliminate water leakage.

  Further, in the first embodiment, nine flowing water holes 5 are concentrically provided around the sliding hole 6 in the support member 7 as shown in FIG. Therefore, the valve body 8 is opened by receiving the water pressure of the fire-extinguishing water W from the primary side, and a part of the fire-extinguishing water W that flows into the water distribution pipe 2 passes through the valve case 10 in the rear stage. At this time, the extinguishing water W flows out from the water flow hole 5 to the secondary side, so that the valve body 8 is opened as described above, whereby the outer peripheral side of the valve case 3 through the plurality of flow holes 4. This is because it becomes expiratory water for a part of the fire-extinguishing water W that flows out, and the flow rate of the fire-extinguishing water W that flows out to the secondary side is increased to reduce the resistance to the fire-extinguishing water W and reduce the pressure loss in the pipe.

  In the first embodiment, a bamboo spring spring is used as the winding spring material 11 as shown in the drawing. As described above, in the first embodiment, the bamboo spring is used as the winding spring material 11 for spring-urging the valve body 8 to the valve seat portion 3a of the valve case 3 in the water supply pipes 1, 1 '. Coil of the same length wound with the same diameter when the valve body 8 is opened and moved in response to the water pressure of the fire-extinguishing water W flowing through the, and contracts against the spring biasing force This is because the volume is reduced as compared with the spring and it is made compact.

  The water stop valve mechanism B is, for example, a butterfly valve or a gate valve.

  In order to detachably attach the valve case 3 to the inner peripheral end of the water distribution short pipe 2A, for example, as shown in FIGS. 1 and 2, a male threaded portion n1 provided at one end of the outer periphery of the valve case 3 is provided. The valve case 3 is detachably attached to the water distribution pipe 2 by being screwed into a female screw portion m1 provided at one end of the inner periphery of the water pipe 2. Therefore, when assembling the valve case 3 in the water distribution pipe 2, or when assembling parts such as the valve body 8, the valve rod 10, and the wound spring material 11 in the valve case 3 at the factory or construction site, 8. When parts such as the valve rod 10, the coil spring material 11, the support member 7 are worn or damaged and need to be replaced or repaired, replacement of these components replaces the water distribution pipe 2. The check valve A for the fire extinguishing equipment in the water distribution pipe 2 is used as it is without being installed, assembled, and replaced on the construction site easily and reliably. However, the illustration of the means for attaching the valve case 3 is a representative example, and the present invention is not limited to this, and the valve case 3 may be detachably attached to the water pipe 2 by, for example, a bayonet method.

  Further, in order to detachably attach the support member 7 to the other end of the valve case 3, a male screw portion n2 provided on the outer periphery of the support member 7 is replaced with a female screw portion m2 provided on the inner periphery of the other end of the valve case 3. The support member 7 is detachably attached by screwing. However, the illustration is a representative example, and the attachment of the support member 7 to the valve case 3 is not limited thereto, and the support member 7 may be detachably attached to the valve case 3 by, for example, a bayonet method.

  Further, the check valve A for fire extinguishing equipment of the first embodiment is connected between the water supply pipes 1 and 1 'of the connected water supply pipe equipment together with the water stop valve mechanism B and the drain valve mechanism C as shown in FIG. The arrangement order at the time of the connection is arbitrary, and the connection means is performed using, for example, a suitable joint means such as a flange joint or a sleeve joint.

  In FIG. 4, J is a water supply port that enables connection of a connection fitting (not shown) attached to the end of a water discharge hose extending from the firefighting pump car in order to supply fire-fighting water W.

  The first embodiment of the check valve A for fire extinguishing equipment according to the present invention has the above-described configuration, and is, for example, a water distribution pipe 2 connected to a desired position of the water supply pipes 1, 1 ′ on the primary and secondary sides of the water supply pipe system P. Among them, for example, in the first embodiment, it is detachably attached to the primary side of the water distribution pipe 2, and the overall shape forms a cylindrical shape and has a plurality of circulation holes 4 in the outer periphery, in the first embodiment, two A valve case 3 provided with a support member 7 provided with a plurality of concentric nine water-flow holes 5 and a sliding hole 6 in the center in the rear end on the rear side; A valve body 8 provided in the case 3 so as to be slidable in the axial direction X, and opened and closed by being contacted with and separated from a valve seat 3a provided on the inner periphery of the primary side of the valve case 3; A flat screw head that is extended and has a tip end portion slidably inserted into the sliding hole 6 of the support member 7 and can be attached to the back portion of the support member 7. A valve rod 10 screwed with a leading end of a set screw 9 having a portion 9a, and the valve body 8 and the support member 7 are interposed between the valve body 8 and the valve seat 3a of the valve case 3 at all times. And a spring member 11 that is urged in the direction of closing in contact with the water, and when used, for example, a pump of a fire fighting pump car is driven to supply high-pressure fire-fighting water W from a water supply source I to a water supply piping system P. When flowing in, the valve body 8 provided with a substantially conical cap 8a as shown in FIGS. 1 and 2 is wound on the front surface of the valve body 8 of the check valve A for the fire extinguishing equipment. The spring member 11 is pressed against the urging force of the spring member 11 and is released from the valve seat portion 3a of the valve case 3 to be opened.

  And the fire-extinguishing water W flows into the water distribution pipe 2 while being distributed to the surroundings without receiving resistance along the conical outer peripheral surface of the cap 8a, and the pressure loss is small due to the average water amount and water pressure. In the state, it is discharged to the secondary side.

  Further, the valve case 3 having one end attached to the inside of the primary side of the water distribution pipe 2 is arranged in the water distribution pipe 2 so that the outer diameter is gradually reduced from the primary side to the secondary side, Since a plurality of, in the first embodiment, four flow holes 4 are provided on the outer peripheral surface of the valve case 3, when the valve body 8 is released from the valve seat portion 3a and opened, the fire-extinguishing water W Is distributed on the outer peripheral side of the valve case 3 on average through the four flow holes 4 provided on the outer periphery of the valve case 3 and smoothly flows out of the water distribution pipe 2. The resistance of the fire-extinguishing water W flowing to the side is reduced, the pressure loss in the pipe is reduced, and the fire-extinguishing water W flows out of the water distribution pipe 2.

  Further, the check valve A for fire extinguishing equipment according to the first embodiment has a valve case 3 having one end attached to the inside of the primary side of the water distribution pipe 2 and has an outer diameter ranging from the primary side to the secondary side as described above. The support member 7 formed in a gradually decreasing diameter and disposed in the water distribution pipe 2 and removably attached to the secondary side of the valve case 3 has a plurality of concentric and nine water flow holes 5. As described above, when the valve body 8 is detached from the valve seat portion 3a and opened as described above, a part of the fire-extinguishing water W flowing into the valve case 3 is moved along the valve rod 10 It flows in the case 3 and flows out from the flowing water hole 5 to the rear stage of the valve case 3.

  At this time, as described above, the fire-extinguishing water W flowing into the valve case 3 by opening the valve body 8 is concentrically around the sliding hole 6 in which the valve rod 10 of the support member 7 can slide. Since a part of the fire-extinguishing water W flowing out from the nine flow holes 5 provided on the secondary side to the outside of the valve case 3 becomes expiratory water, the valve case is passed through the plurality of flow holes 4 provided on the outer periphery of the valve case 3. The other part of the fire-extinguishing water W flowing out toward the outer peripheral side of the water flow out at a faster speed, the resistance to the fire-extinguishing water W is small, and the pressure loss in the pipe is reduced.

  Moreover, since the leading end of the set screw 9 is screwed into the rear end of the valve rod 10, the flat screw head 9a of the set screw 9 can slide the valve rod 10 as an attachment member K. Since the supporting member 7 can be attached to the back of the supporting member 7 and the supporting member 7 is strongly reinforced against the high water pressure of the fire-extinguishing water W, the valve structure is robust without causing deformation and distortion.

  Thus, since the pressure loss in the water distribution pipe 2 is reduced as described above, the opening and closing operations of the valve body 8 with respect to the high-pressure fire-fighting water W are reliably and smoothly performed with high accuracy.

  And as a result of measuring the pressure loss (DELTA) P of the check valve A for fire extinguishing equipment of this Embodiment 1, and equivalent pipe | tube length (m), it becomes like the following table [1].

  In the above table [1], each of the three samples of sample No1, sample No2, and sample No3 as the check valve A for fire extinguishing equipment of the first embodiment when the nominal diameter of the water distribution pipe 2 is 100A flows in. Flow rate (Q) [l / min], primary pressure (P1), secondary pressure (P2), pressure loss ΔP = (P1) when the reference flow rate of fire fighting water W is 2100 [l / min] -P2) was measured three times each, the equivalent pipe length (m) was calculated, and the average equivalent pipe length (m) was obtained.

The equivalent pipe length L (m) refers to the pressure loss at the water supply ports J and J when the fire fighting water W has a predetermined flow rate, and is calculated by the following equation [1].
Formula [1]
Equivalent tube length L (m) = 8503.4 × D ^4.87 × pressure loss ΔP ÷ flow rate Q ^1.85
It is.

  From the above table [1], when the flow rate (Q) [l / min] of the fire-fighting water W flowing into the water distribution pipe 2 is measured three times for each of the sample No1, sample No2, and sample No3 When the measured values of the flow rate (Q) [l / min] are 2101 [l / min], 2108 [l / min], and 2104 [l / min], respectively, the primary pressure ( The measured values of P1) are 0.501, 0.502, and 0.496, respectively, and the measured values of the secondary pressure (P2) are 0.451, 0.451, and 0.447, respectively. As a result of the measurement of the primary side pressure (P1) and the secondary side pressure (P2) from the first time to the third time, the pressure loss ΔP that can be understood is 0.050, 0.051, and 0.049, respectively.

  The flow rate (Q) [l / min] of the fire-fighting water W flowing into the water distribution pipe 2 for the sample No1 is 2101 [l / min], 2108 [l / min], 2104 [l / min], respectively, as described above. ], The equivalent tube length L (m) is calculated by the above equation [1], and is 26.32 (m), 25.47 (m), 24.56 (m), and the equivalent tube length average of three times The value is 25.45 (m).

  Similarly, the measured value of the flow rate (Q) [l / min] when the flow rate (Q) [l / min] of the fire fighting water W flowing into the water distribution pipe 2 for the sample No 2 is measured three times is 2105, respectively. In the case of [l / min], 2105 [l / min], and 2107 [l / min], the measured values of the primary pressure (P1) for the first time to the third time are 0.498, 0.498, and 0, respectively. The measured values of the secondary pressure (P2) are 0.447, 0.449, and 0.449, respectively. As a result of the measurement of the primary pressure (P1) and the secondary pressure (P2) from the first time to the third time, the pressure loss ΔP that can be understood is 0.051, 0.049, and 0.051, respectively.

  When the flow rate (Q) [l / min] of the fire-fighting water W flowing into the water distribution pipe 2 for the sample No2 is 2105 [l / min], 2105 [l / min], and 2107 [l / min], respectively When the equivalent pipe length L (m) is calculated by the above equation [1], it becomes 25.54 (m), 24.54 (m), and 25.50 (m), and the equivalent pipe length average value of 3 times is 25.54 (m). 19 (m).

  Moreover, the measured value of the flow rate (Q) [l / min] when the flow rate (Q) [l / min] of the fire-extinguishing water W flowing into the water distribution pipe 2 for each sample No3 is measured three times is 2111 [ l / min], 2107 [l / min], and 2100 [l / min], the measured values of the primary pressure (P1) for the first time to the third time are 0.500, 0.499, 0. 497, and the measured values of the secondary pressure (P2) are 0.450, 0.449, and 0.447, respectively. As a result of the measurement of the primary pressure (P1) and the secondary pressure (P2) from the first time to the third time, the pressure loss ΔP that can be understood is 0.050, 0.050, and 0.050, respectively.

  When the flow rate (Q) [l / min] of the fire-fighting water W flowing into the water distribution pipe 2 for the sample No3 is 2111 [l / min], 2107 [l / min], and 2100 [l / min], respectively When the equivalent pipe length L (m) is calculated by the above equation [1], it becomes 24.91 (m), 25.00 (m), and 25.15 (m), and the equivalent pipe length average value for three times is 25.91. 02 (m).

  In addition, as a comparative example with respect to the pressure loss ΔP of the fire fighting equipment check valve A of the first embodiment and the equivalent pipe length (m), the results of measuring the pressure loss, equivalent pipe length, etc. of the fire fighting equipment check valves of other companies are shown. Listed in Table [2] below.

  In the above table [2], the reference flow rate of the fire-extinguishing water W that flows in for each sample No. 1 'of the water distribution valve for the fire-extinguishing equipment when the nominal diameter of the short pipe having the check valve is 100A is 2100 [l / min. ], The flow rate (Q) [l / min], the primary side pressure (P1), the secondary side pressure (P2), and the pressure loss ΔP = (P1−P2) are respectively measured, and the equivalent pipe length (m ) Was calculated, and the average equivalent pipe length (m) was determined.

  Further, the equivalent pipe length L (m) was calculated by the above formula [1] in the same manner as the fire fighting equipment check valve A of the first embodiment.

  Then, from the above table [2], the flow rate (Q) [l / min] when the flow rate (Q) [l / min] of the fire-extinguishing water W flowing into the short pipe is measured three times for the sample No1 ′ is measured. When the values are 2105 [l / min], 2100 [l / min], and 2100 [l / min], respectively, the measured values of the primary pressure (P1) are 0.498, 0.497, 0. 494, and the measured values of the secondary pressure (P2) are 0.398, 0.399, and 0.396, respectively. As a result of measurement of the primary side pressure (P1) and the secondary side pressure (P2) from Table [2], the pressure loss ΔP that can be seen is 0.100, 0.098, and 0.098, respectively.

  The flow rate (Q) [l / min] of the fire-fighting water W flowing into the short pipe for the sample No1 ′ is 2105 [l / min], 2100 [l / min], and 2100 [l / min], respectively. When the equivalent pipe length L (m) is calculated by the above equation [1], it becomes 50.08 (m), 49.30 (m), and 49.30 (m), and the equivalent pipe length average value is 49.56 (m). It becomes.

  Therefore, the check valve A for fire extinguishing equipment of Embodiment 1 is 0.050 when the average value obtained by measuring the pressure loss ΔP of the sample No1, the sample No2, and the sample No3 three times is calculated. In the comparative example, the value is 0.099, and the check valve A for fire extinguishing equipment according to Embodiment 1 is as small as about 1/2.

  In addition, the check valve A for the fire extinguishing equipment of Embodiment 1 has an equivalent pipe length average value of 25.2 (m) for the sample No1, the sample No2, and the sample No3. For the check valve, the equivalent pipe length average value is 49.56, and the check valve A for fire extinguishing equipment of the first embodiment is smaller by about 1/2.

  As described above, the check valve A for fire extinguishing equipment according to the first embodiment is opened by applying a high water pressure from the water supply source I by driving a pump of a water pump or a fire pump car connected to the water storage tank. The pressure loss ΔP in the distribution pipe 2 is as small as about 0.05 with respect to the fire extinguishing water W sent to the secondary side, and the average equivalent pipe length is 25.2 (m). Since about 1/2 is small, the fire-fighting water W can be sent quickly in a short time. In addition, the ejection pressure of the fire-extinguishing water W from the water discharge facility provided on each floor of the building can be obtained as a sufficient sufficient ejection pressure stipulated in the Fire Service Law, and is suitable for quick and reliable initial fire extinguishing.

  Therefore, the fire water W can be supplied by a pump having a small capacity. In addition, even when the building becomes taller, it is possible to supply fire-fighting water W having a sufficient ejection pressure in a short time without using a small-capacity pump and relaying several pumps. In addition, the pressure in the water pipes 1, 1 'and the water distribution pipe 2 does not become extremely high, and an excessive load is not applied to the check valve A for the fire extinguishing equipment of the first embodiment. Since a large load is not applied to the parts such as the body 8, the support member 7, and the wound spring material 11, mechanical fatigue is reduced and the life is extended. For this reason, the valves such as the check valve A for the fire extinguishing equipment, the stop valve of the stop valve mechanism B, and the drain valve of the drain valve mechanism C are free from the cause of failure, so there is little replacement work for new parts. Therefore, maintenance and management can be performed easily. In addition, there is no rupture of pipe systems such as the water supply pipes 1 and 1 'and the water distribution pipe 2 and leakage from each pipe end connection point.

  Moreover, since the check valve A for fire extinguishing equipment of this Embodiment 1 supplies the fire-extinguishing water W, since the pressure loss in a pipe | tube is small, the pump of a water pump or a fire pump automobile is driven, and these When the valve body 8 is closed by the urging force of the winding spring material 11 because the pump is stopped, the sliding motion of the valve rod 10 with respect to the support member 7 responds to the water pressure of the fire-extinguishing water W that changes in small increments. Therefore, the valve body 8 can be opened or closed with high accuracy and reliably. Therefore, the fire-extinguishing water W supplied into the check-out valve A for the fire-extinguishing equipment can cause pulsation, and can reliably prevent backflow as an original function of the check valve.

  In the first embodiment, the valve rod 10 is slidably inserted into the sliding hole 6 of the support member 7 attached to the rear end portion of the valve case 3 so that the valve rod 10 is supported. When the body 8 is opened according to the water pressure of the fire-extinguishing water W, the valve rod 10 is smoothly and reliably slid while being guided in the sliding hole 6 of the support member 7, and always has a predetermined capacity at a predetermined pressure. Fire extinguishing water W can be supplied. Further, the wear of the valve body 7, the valve rod 10, and the wound spring material 11 is reduced, and an unreasonable addition is not added to these parts, so that mechanical fatigue is reduced and the life is extended.

  And since the winding spring material 11 which is interposed between the support member 7 and the valve body 8 and spring-biases the valve body 8 is used in this Embodiment 1, as shown in a figure, a bamboo child spring is used. As the valve body 8 receives the water pressure of the fire-extinguishing water W flowing through the water supply piping system P and is opened and moved as described above, the wound spring material 11 is reduced in size, so Even if the outer volume of the valve is reduced in size compared to a conventional check valve for fire extinguishing equipment using a coil spring of the same length, the stroke when moving the valve body 8 is increased. Thus, the valve opening operation and the valve closing operation can be ensured.

  When the pumping source of the fire pump vehicle or the like is stopped, the water supply source I becomes low pressure or the water supply side O becomes high pressure for some reason, the valve element 8 is The valve rod 10 is guided into the sliding hole 6 of the support member 7 and is closed by contacting the valve seat 3a of the valve case 3 mounted in the water distribution pipe 2 by sliding. The supply of the system P is shut off and the backflow is reliably prevented.

  Further, the check valve A for fire extinguishing equipment according to the first embodiment is detachable in the water distribution pipe 2 connected to a desired position between the primary and secondary water supply pipes 1 and 1 'as described above. One end of the primary side is attached, the overall shape is cylindrical and has a plurality of flow holes 4 on the outer periphery, a plurality of water flow holes 5 at the rear end of the secondary side and a sliding hole at the center 6 is a valve case 3 provided with a support member 7, and a valve seat provided in the valve case 3 so as to be slidable in the axial direction X and provided on the inner periphery of the valve case 3 on the primary side A valve body 8 that is brought into contact with and separated from 3a and is stopped from opening and closing, and a distal end portion of one end of the valve body 8 is slidably inserted into the slide hole 6 in the support member 7 to be attached. A valve rod 10 in which a set screw 9 having a flat screw head portion 9 a that can be attached to the back portion of the support member 7 is screwed into a distal end portion, and the valve body 8 and the support member 7. And the winding spring material 11 that is interposed between and urged in the direction in which the valve body 8 is always brought into contact with the valve seat portion 3a of the valve case 3 and closed. The valve body 8 is inserted from an opening provided in the back portion of the valve case 3, and the wound spring material 11 is inserted into the valve case 3 around the valve rod 10 extending from the valve body 8. Thereafter, the rear end portion of the valve rod 10 is inserted into the sliding hole 6 provided in the center of the support member 7. Then, a set screw 9 is screwed into the rear end portion of the valve rod 10, and a flat screw head 9 a of the set screw 9 is attached to the back portion of the support member 7 to flow into the valve case 3. The support member 7 is reinforced against the high water pressure of the fire-extinguishing water W, the valve body 8 is pressed against the valve seat 3a of the valve case 3 by the urging force of the coil spring material 11, and the valve body 8 and the coil spring are placed in the valve case 3. Components such as the material 11 and the support member 7 are assembled at predetermined locations.

  Then, the valve body 8, the wound spring material 11, and the support member 7 are formed by screwing the male screw portion n1 provided on the outer periphery on the primary side of the valve case 3 to the female screw portion m1 provided on the inner periphery on the primary side of the water distribution pipe 2. By attaching the valve case 3 assembled inside to the water distribution pipe 2, the check valve A for fire extinguishing equipment is assembled in advance at the factory or construction site.

  Since the check valve A for fire extinguishing equipment of the first embodiment is assembled in this way, the fire extinguishing equipment of the first embodiment is placed at a desired position in the water supply piping system P through which the fire water W flows from the primary side to the secondary side. The check valve A can be quickly and reliably connected at the construction site without much time and labor.

  Next, FIG. 5 and FIG. 6 show Embodiment 2 of the check valve for a fire hydrant device of the present invention.

  In the first embodiment, the valve rod 10 extended at the rear part of the valve body 8 that is opened and closed against the urging force of the winding spring material 11 under the high water pressure of the fire-extinguishing water W is the support member 7 of the valve case 3. In the second embodiment, in order to avoid the possibility of colliding with a butterfly valve or the like of the water stop valve mechanism B not shown in detail in the drawing provided in the subsequent stage of the water distribution pipe 2, there is no risk of impairing the opening / closing operation. One end 10 ′ a is separated via an allowance S so that the moving stroke is shorter than that of the valve rod 10, and the valve rod 10 ′ is formed in a cylindrical shape having a length L that is substantially half of the axial length X of the valve case 3. Then, the other end 10'b of the valve rod 10 'is slidably inserted into the sliding hole 6 of the support member 7 so that the movement stroke of the valve rod 10' when the valve body 8 is opened and closed is implemented as described above. Shorter than the valve rod 10 of the first mode, So that there is no hindrance to the opening and closing operation of the valve of the water stop valve mechanism portion B to prevent collisions that.

  Moreover, in the first embodiment, as the attachment member K, the flat screw head 9 a of the set screw 9 screwed into the valve rod 10 is attached to the back surface of the support member 7, so that the support member 7 receives water pressure. In this embodiment, the valve rod 10 'is used as an attachment member K instead of the flat screw head 9a of the set screw 9 of the first embodiment. The valve rod 10 is slidably inserted into the valve rod 10 and is supported by a set screw 9 'whose tip is screwed into the valve body 8 and supports the valve body 8 so as to be able to contact the valve rod 10'. Since the hook-like attachment portion 20 provided on the outer periphery of the rear end can be attached to the back portion of the support member 7, deformation and distortion when the support member 7 is subjected to high water pressure are caused in the attachment portion 20. To prevent it. Further, reference numeral 21 denotes a stopper collar portion screwed to the outer periphery of the tip of the valve rod 10 '. The stopper flange portion 21 prevents the valve rod 10' from slipping out of the support member 7 when the valve is opened. ing. Reference numeral 22 denotes a stop ring member that is detachably screwed to the front surface of the valve case 3.

  And in this Embodiment 2, when the pump of a fire fighting pump automobile is driven and the high-pressure fire extinguishing water W flows from the water supply source I to the water supply side O in the water supply piping system P, for example, the check valve A for the fire extinguishing equipment The valve body 8 is pushed against the urging force of the winding spring material 11 and is released from the valve seat portion 3a of the valve case 3 to be opened, and a part of the fire-extinguishing water flowing into the valve case 3 is a valve rod. 10 'is discharged from the water flow hole 5 to the rear stage of the valve case 3 and flows into the outer periphery through a plurality of flow holes 4 provided in the outer periphery of the valve case 3 to become a part of the fire extinguishing water W. The point that the flow velocity is increased, the resistance to the fire-extinguishing water W is small, the pressure loss in the pipe, and the equivalent pipe length are reduced is the same configuration and operation as in the first embodiment.

  However, in the second embodiment, the valve rod 10 ′ is separated from the valve body 8 via the allowance S so that one end 10 ′ a is separated to a length L that is substantially half of the axial length X of the valve case 3. As described above, even if the valve body 8 receives the high water pressure of the fire-extinguishing water W against the urging force of the coil spring material 11 as described above, the valve body 8 is immediately removed from the valve seat portion 3a of the valve case 3. The rod 10 'does not respond. That is, when the valve body 8 continues to be pushed in, the allowance S is gradually narrowed and the valve body 8 collides with one end 10'a of the valve rod 10 ', the valve rod 10' is wound while being supported by the set screw 9 'for the first time. It is pushed against the urging force of the spring material 11.

  And in this Embodiment 2, since the valve rod 10 'is formed in the length L of the substantially half of the axial length X of the valve case 3 as mentioned above, the movement stroke of the valve rod 10' is the above-mentioned. The first embodiment is shorter than the valve rod 10 of the first embodiment, and the collision with the water stop valve mechanism B or the like is reliably prevented, so that the valve opening / closing operation of the water stop valve mechanism B is not hindered at all. Unlike the above, other configurations and operations are the same as those of the first embodiment.

  The present invention has a small pressure loss in the pipe with respect to the fire-fighting water flowing from the primary side to the secondary side, efficiently delivers the fire-fighting water even with the driving force of a small-capacity pump, Fire extinguishing water is supplied from a built-in water discharge hose stored in a provided box to supply fired water at a constant pressure at a constant pressure without causing pulsation. Is stable against the water pressure of fire-extinguishing water, and the valve opening or closing operation can be performed with high accuracy and reliability, the pressure loss in the pipe is small, and the components are overloaded. Therefore, the mechanical fatigue of the parts is reduced, the service life is extended, the cause of the failure is eliminated, the rupture of the pipe system and the water leakage from the pipe end connection part are suppressed, and the backflow is surely prevented. For easy installation, laying, etc. Excellent processability, moreover decomposition during maintenance and inspection a easy replacement of the new part easily and reliably performed, suitable for use and functions become structural robustness.

FIG. 1 is a partially cutaway sectional view showing Embodiment 1 of a check valve for fire extinguishing equipment of the present invention. FIG. 2 is a partially cutaway sectional view showing a state in which the valve body of the check valve for fire extinguishing equipment is fully opened. FIG. 3 is a rear view of the check valve for the fire extinguishing equipment. FIG. 4 is a circuit diagram of a water pipe system showing an example of a construction state of the check valve for fire extinguishing equipment of the first embodiment. FIG. 5 is a sectional view showing Embodiment 2 of the check valve for fire fighting equipment of the present invention. FIG. 6 is a cross-sectional view showing a state in which the valve body of the check valve for fire extinguishing equipment is fully opened.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water supply pipe 1 'Water supply pipe 2 Water distribution pipe 2A Water distribution short pipe 3 Valve case 4 Flow hole 5 Water flow hole 6 Sliding hole 7 Support member 8 Valve body 8a Cap 9 Set screw 9' Set screw 9a Screw head 10 Valve rod 11 Winding spring material A Check valve for fire extinguishing equipment B Stop valve mechanism C Drain valve mechanism J Water supply port I Water supply source K Additional member O Water supply destination P Water supply piping system W Fire extinguishing water

Claims (7)

In a check valve for fire extinguishing equipment that is installed at a desired location in the water supply piping system and prevents reverse flow of fire fighting water to the water supply source,
A water distribution pipe connected to a desired position between the water supply pipes on the primary side and the secondary side;
One end of the primary side is removably attached to the water distribution pipe, the overall shape is cylindrical, and there are a plurality of flow holes on the outer periphery, and a plurality of water flow holes and a center are provided at the rear end of the secondary side. Has a valve case provided with a support member having a sliding hole, and
A valve body provided in the valve case so as to be slidable in the axial direction, and opened and closed by contacting and leaving a valve seat provided on the inner periphery of the valve case on the primary side;
A valve rod provided at the rear end with an attachment member that is slidably inserted into a sliding hole in the support member at one end and can be attached to the back of the support member;
A winding spring material interposed between the valve body and the support member, and energizing the valve body in a closing direction by always contacting the valve seat of the valve case;
A check valve for fire-fighting equipment.   The check valve for fire extinguishing equipment according to claim 1, wherein the valve case has an outer peripheral diameter that is gradually reduced from the primary side to the secondary side and is disposed in the water pipe.   The check valve for fire extinguishing equipment according to any one of claims 1 and 2, wherein a substantially conical cap is formed on a front surface of the valve body so as to face a water supply source.   The valve rod is extended from a valve body, and the attachment member is a flat screw head of a set screw having a tip portion screwed into the valve rod. A check valve for fire extinguishing equipment according to claim 1.   The valve rod is separated from the valve body through an allowance and formed into a cylindrical shape having a length approximately half of the axial length of the valve case, and the attachment member is a hook-like shape provided on the outer periphery of the other end of the valve rod. The valve body is slidably inserted into the valve rod, and the valve body is supported so as to be able to abut against the valve rod by a set screw whose tip is screwed into the valve body. The check valve for fire extinguishing equipment according to any one of claims 1 to 3.   The check valve for a fire extinguishing equipment according to any one of claims 1 to 5, wherein the wound spring material is a bamboo spring. In the check valve unit for fire extinguishing equipment installed at the desired location of the water supply piping system and preventing the reverse flow of fire fighting water to the water supply source,
One end of the primary side is removably attached to the water pipe connected to a desired position between the primary side and secondary side water supply pipes, the overall shape is cylindrical, and there are a plurality of flow holes on the outer periphery. A valve case to which a support member having a plurality of water holes and a sliding hole at the center is attached at the rear end of the secondary side;
A valve body provided in the valve case so as to be slidable in the axial direction, and opened and closed by contacting and leaving a valve seat provided on the inner periphery of the valve case on the primary side;
A valve rod provided at the rear end with an attachment member that is slidably inserted into the sliding hole of the support member at one end and can be attached to the back of the support member;
A winding spring material interposed between the valve body and the support member, and energizing the valve body in a closing direction by always contacting the valve seat of the valve case;
A check valve unit for fire fighting equipment.

Images