JP4758675B2 - Fire extinguisher flow regulator - Google Patents

Description

  The present invention relates to a fire extinguisher flow rate regulator for a mixing device used in foam and closed spray fire extinguishing equipment.

  In a fire extinguishing facility that radiates a fire extinguisher aqueous solution from a foam head, a closed spray head, etc. (hereinafter referred to as “discharge port”) installed in a building, a device that dilutes and mixes the fire extinguisher with water Many mixing units such as pressure proportioners (differential pressure mixing devices), pump proportioners (pump mixing devices), pressure side proportioners (press-fit mixing devices), line proportioners (pipe mixing devices), etc. There is a method. Of these, the pressure proportioner (differential pressure mixing device) is most frequently used.

  A fire extinguisher mixing device 100 as the pressure proportioner (differential pressure mixing device) includes a mixer 101 provided in the middle of a fire extinguishing pipe main pipe 103 connecting from a fire extinguishing pump to a discharge port, as shown in FIG. Extinguishing agent storage pressurizing tank 102 as a supply source of extinguishing agent, pressurized water side piping 104 and extinguishing agent side piping 105 connecting between the mixer 101 and the extinguishing agent storage pressurizing tank 102, and extinguishing agent storage pressurization And a fire extinguishing agent flow rate adjusting unit 106 that adjusts the supply flow rate of the extinguishing agent supplied from the tank 102 to the mixer 101 via the extinguishing agent side pipe 105.

The operation principle of the pressure proportioner (differential pressure mixing device) type extinguishing agent mixing device 100 will be described with reference to FIG.
When a cross-sectional area narrow portion (so-called reduced diameter portion) 101a having an inner diameter smaller than that of the inlet portion 101b is provided inside the mixer 101, and a water flow is generated in the mixer 101 by operating the discharge port or opening the test valve, the narrow portion The water speed (flow velocity) of 101a is faster than the flow velocity of the inlet portion 101b of the mixer 101. As a result, the pressure of the narrow portion 101a is lower than the pressure of the inlet portion 101b of the mixer 101 according to Bernoulli's theorem, and a pressure difference (hereinafter referred to as “differential pressure”) between the inlet portion 101b and the narrow portion 101a. Occurs.

On the other hand, the inside of the fire extinguishing agent storage pressurization tank 102 is divided into a pressurization water region and a fire extinguishing agent region by a diaphragm, and the inlet portion 101b of the mixer 101 passes through the pressurization water side piping 104 and the fire extinguishing agent storage pressurization tank 102. The narrow portion 101 a of the mixer 101 is connected to the extinguishing agent region of the extinguishing agent storage pressurizing tank 102 via the extinguishing agent side pipe 105. Accordingly, when the pressure on the inlet portion 101b side becomes higher than that of the narrow portion 101a, the pressurized water is pushed into the pressurized water region of the extinguishing agent storage pressurizing tank 102, and the extinguishing agent is pushed out from the extinguishing agent storage pressurizing tank 102 through the diaphragm. It is. The extruded fire extinguishing agent is sent to the mixer 101 through the fire extinguishing agent side pipe 105 and mixed with water flowing through the fire extinguishing pipe main pipe 103.
Thus, the magnitude of the pressure that decreases in the narrow portion 101a of the mixer 101 is relative to the flow velocity passing there, and the differential pressure generated in the mixer 101 is also relative to the flow velocity. The fire extinguishing agent can be sent in accordance with the flow rate per unit time regardless of the pressure.

In the mixing apparatus 100, it is necessary to mix a fire extinguisher at a constant dilution mixture concentration even if the flow rate of water sent from the pump changes. For this purpose, the extinguishing agent flow rate regulator 106 is provided near the mixer 101 of the extinguishing agent side pipe 105.
In this way, the amount of the extinguishing agent in the extinguishing agent storage pressurization tank 102 is controlled and pumped into the mixer 101 to mix water and the extinguishing agent, thereby generating an aqueous extinguishing agent solution having a predetermined mixed concentration.

Here, if the pressure at the inlet of the mixer 101 is P1, the pressure at the narrow portion is P2, and the pressure at the outlet is P3, the pressure difference generated by the mixer 101 is P1-P2, and the pressure loss is P1-P3. Become.
The above differential pressure has a relative relationship with the flow rate, but when the flow rate decreases and the generation of the differential pressure decreases, pressure loss due to friction generated between the extinguishing agent and the pipe inner wall surface in the pressurized water side piping 104 and the extinguishing agent side piping 105 Due to the resistance of the diaphragm in the extinguishing agent storage pressurization tank 102 (hereinafter referred to as “pressure loss”), it cannot be sufficiently pumped and mixing according to the flow rate cannot be performed.
That is, the flow rate necessary to obtain a differential pressure for properly mixing water and the extinguishing agent is the minimum flow rate of the mixer.

Theoretically, the pressure reduced in the narrow portion 101a of the mixer 101 recovers to the pressure before the reduction, but in reality, it is caused by pressure loss, turbulence, etc. due to friction on the wall surface of the mixer 101. It cannot be recovered to the inlet pressure. For this reason, the difference between the pressure at the inlet and the pressure at the outlet becomes the pressure loss of the mixer 101.
Here, the greater the flow rate, the lower the pressure in the narrow portion 101a and the greater the range of pressure to be recovered. In proportion to this, the pressure loss generated in the mixer 101 also increases at an accelerated rate.
On the other hand, if the maximum allowable value of pressure loss is increased, the maximum flow rate can be increased. However, it is necessary to install a fire extinguishing pump capable of adding the generated pressure loss and to increase the piping size. Therefore, it has been difficult to put a practical mixer into use in a wide flow range because of the cost increase.

  On the other hand, as shown in FIG. 9, in the conventional extinguishing agent flow rate regulator 106, the flow rate is controlled by the extinguishing agent orifice 106a. Since the extinguishing agent orifice 106a has a structure provided with an opening penetrating perpendicularly to the plane, the pressure loss at the inflow portion is large, and when the differential pressure is small, the amount of the extinguishing agent proportional to the differential pressure is supplied to the mixer 101. The minimum flow rate was limited because it could not be charged.

Here, the relationship between the flow rate (horizontal axis) of the fire extinguishing pipe main pipe 103 and the mixed concentration (vertical axis) of the extinguishing agent by the extinguishing agent flow rate regulator 106 using the extinguishing agent orifice 106a will be described with reference to FIG. To do.
In FIG. 6, the broken line L1 is extinguished so that the specified mixed concentration of 1.5% can be substantially maintained throughout the main pipe flow rate of 60 to 900 [l / min] except for a low flow rate of 300 [l / min] or less. The case where the agent orifice diameter is adjusted is shown. On the other hand, the broken line L2 indicates a case where the extinguishing agent orifice diameter is adjusted (enlarged) so that the specified mixed concentration of 1.5% can be substantially maintained up to the lower flow rate band. In this case, since the differential pressure increases at a large flow rate, the mixed concentration is higher than a predetermined mixed concentration except in the low flow rate band. Furthermore, in that case, the amount of fire extinguisher mixed per unit time also increases, so if the fire extinguisher is continuously released from the outlet during the set release time, a large amount of necessary fire extinguisher must be secured. There was a problem.

In order to cope with such a problem, as a conventional technique, a specified mixed concentration is individually provided for each of a plurality of bands from a low flow rate zone of the main pipe flow rate to a high flow rate zone between the pressurized water supply device and the discharge port. A fire extinguisher mixing apparatus that is equipped with a plurality of mixers and a fire extinguisher flow rate regulator adjusted so as to be maintained in parallel, detects the discharge flow rate at the discharge port, and selects an appropriate mixer according to the detected flow rate Has been devised (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 64-11570

However, in the above-described conventional example, the fire extinguishing pipe main pipe is branched into a plurality of parts, and the mixer and the fire extinguisher flow rate regulator are individually provided. Therefore, the structure of the entire apparatus becomes complicated and large in scale and configured. There is a problem that a large number of parts are required, production costs increase, and productivity decreases.
An object of the present invention is to provide a fire extinguisher flow rate regulator capable of performing proportional mixing of a stable fire extinguisher over a wide range of main pipe flow rates while reducing production costs.

The invention described in claim 1 is a fire extinguisher mixing apparatus for supplying and mixing a fire extinguisher stock solution to flowing water sent to a discharge port for performing fire extinguishing, in order to adjust the concentration of the fire extinguisher aqueous solution, the fire extinguisher stock solution a fire extinguishing agent flow regulator for regulating the supply flow rate of a reduced diameter portion which is narrowly formed than the flow path of the extinguishing agent stock located upstream, in accordance with the supply flow rate of the extinguishing agent stock solution supply A configuration is adopted in which when the flow rate is high, a part of the reduced diameter portion is closed, and when the flow rate is low, the reduced diameter portion is opened and variable means for variably adjusting the reduced diameter ratio of the reduced diameter portion is provided.

The “reduced diameter portion” refers to a portion formed such that a cross-sectional area perpendicular to the flow direction is smaller than the flow path immediately before (front side). In addition, the cross-sectional shape of the reduced diameter portion is not limited to a circle, and may be any shape. The same applies to the inventions described in other claims described below.
Further, “variable adjustment of the diameter reduction ratio” means that the size of the pressure loss is variably adjusted by increasing or decreasing the flowable opening area by one or a plurality of diameter reducing portions.

In the above configuration, when the supply of the extinguishing agent stock solution is started from the extinguishing agent storage tank along with the water supply to the discharge port for performing the extinguishing, the extinguishing agent stock solution passes through the reduced diameter portion and is mixed with the flowing water.
And when the water supply flow rate to the discharge port for fire extinguishing is small, the supply flow rate of the extinguishing agent stock solution is also small, and as a result, the pressure loss due to friction etc. occurring on the pipe inner wall surface becomes small, but it occurs in the mixer Since the differential pressure is also reduced, the effect of pressure loss is relatively large. Therefore, the diameter reduction rate of the reduced diameter part is adjusted so that the pressure loss is reduced, and sufficient to reach the target extinguishing agent concentration. Adjust to be able to supply.
In addition, when the water supply flow rate to the discharge port for fire extinguishing is large, the supply flow rate of the extinguishing agent stock solution also increases, and as a result, stable supply is performed, so that the pressure loss is reduced in the diameter reduction rate of the reduced diameter portion. Adjust so that it is reasonably large, and adjust so that the excess extinguishing agent is not wasted exceeding the intended concentration of the extinguishing agent.

Further, the invention according to claim 1 is characterized in that the variable means includes a case portion into which the extinguishing agent stock solution flows, a piston portion that is supported by the inflow of the extinguishing agent stock solution in the case portion, and the piston portion. And an elastic body that urges in the direction opposite to the moving direction due to the inflow of the extinguishing agent stock solution, and the diameter reduction rate of the reduced diameter part is adjusted by the movement of the piston part.

The " movable supported piston part " means a moving direction to one of the reciprocating pistons and a moving direction to the other, for example, a flow direction of the extinguishing agent stock solution and a forward direction. It does not indicate a limited meaning that matches. The same applies to other claims.

In the above configuration, when the flow rate of the extinguishing agent stock solution is small, the piston part is in the retracted position by the elastic body, and the extinguishing agent stock solution passes through the reduced diameter part with a large diameter reduction rate, and the extinguishing agent is in a low pressure loss state. Stock solution is supplied.
When the flow rate of the extinguishing agent stock solution increases, the piston part moves, and the extinguishing agent stock solution passes through the reduced diameter portion with a small diameter reduction rate. Thereby, the pressure loss of the extinguishing agent stock solution when passing through the reduced diameter portion increases, and the flow rate is limited.
In this way, pressure loss due to each reduced diameter part is adjusted to increase the flow rate of the extinguishing agent stock solution, so the pressure loss that can secure the supply amount of the extinguishing agent stock solution required in the low flow rate range Even if is set, it is possible to switch so as to generate a pressure loss that does not cause excessive supply after the flow rate is increased.

Furthermore, in the invention described in claim 1, the reduced diameter portion is composed of a plurality of reduced diameter portions arranged in parallel, and a part of the reduced diameter portions is moved by the movement of the piston portion due to the flow of the extinguishing agent stock solution. It is configured to be formed in a closed arrangement.

In the above configuration, when the flow rate of the extinguishing agent stock solution is small, the piston portion is in the retracted position by the elastic body, and the plurality of reduced diameter portions are fully opened to pass the extinguishing agent stock solution in a low pressure loss state.
When the flow rate of the extinguishing agent stock solution increases, the piston part moves, a part of the plurality of reduced diameter portions is blocked, and the extinguishing agent stock solution is allowed to pass through in a state where the pressure loss is increased.
Therefore, it is possible to avoid both supply shortage of the extinguisher stock solution at a low flow rate and excessive supply at a high flow rate.
As an example of the above configuration, a plurality of openings are provided as a plurality of reduced diameter parts in at least one of the case part and the piston part, and a part of the openings are closed as the piston part moves forward. The arrangement to arrange is mentioned. However, it is not limited to this.

The invention described in claim 2 has the same configuration as that of the invention described in claim 1 except for the reduced diameter part, and the reduced diameter part is part of the reduced diameter part due to the movement of the piston part due to the flow of the extinguishing agent stock solution. Is formed in a closed arrangement.

In the above configuration, when the flow rate of the extinguishing agent stock solution is small, the piston part is in the retracted position by the elastic body, and the passing of the extinguishing agent stock solution is performed in a low pressure loss state before the reduced diameter part is adjusted in the diameter reduction rate. Done.
Then, when the flow rate of the extinguishing agent stock solution increases, a part of the reduced diameter portion is blocked by the forward movement of the piston portion, and the extinguishing agent stock solution is passed with the pressure loss increased.
Therefore, it is possible to avoid both supply shortage of the extinguisher stock solution at a low flow rate and excessive supply at a high flow rate.
As an example of the above configuration, there may be mentioned a configuration in which one opening portion is provided as a reduced diameter portion in the case portion or the piston portion, and a part of the opening portion is closed by the forward movement of the piston portion. However, it is not limited to this.

According to the first aspect of the present invention, the variable means adjusts the diameter reduction rate of the reduced diameter portion through which the extinguishing agent stock solution passes in accordance with the supply flow rate of the extinguishing agent stock solution. Since the amount reduction can be avoided and the excessive supply of the fire extinguishing agent when the water supply flow rate is increased, a stable mixed concentration can be maintained in a wide range with respect to the water supply amount or the fire extinguishing agent supply amount. This also prevents excessive supply of the extinguishing agent stock solution when the water supply flow rate is increased, thereby preventing waste of the extinguishing agent stock solution. Further, along with this, it becomes possible to continue the discharge of the extinguishing agent solution during the set release time without enlarging the storage means such as a tank for storing the extinguishing agent of the extinguishing agent mixing apparatus.
Furthermore, the present invention stabilizes the mixing concentration by variably adjusting the diameter reduction ratio of the diameter reducing portion, so that it is not necessary to provide a separate mixer as in the prior art, reducing the production cost of the apparatus, It is possible to improve the performance.
The present invention is also applicable to the case where the extinguisher stock solution is supplied to the mixer by a fire extinguisher stock solution generator rather than a storage means such as a tank that stores the stock solution.
That is, the extinguishing agent flow rate regulator according to the present invention uses, for example, the differential pressure between the inlet and the narrow part as in the mixer described above, and the variable means of the extinguishing agent flow rate regulator is reduced according to the extinguishing agent flow rate. Any device that can variably adjust the diameter reduction ratio of the diameter portion may be used.

In addition, the invention according to claim 1 is a configuration in which the piston portion is moved by increasing the flow rate of the extinguishing agent stock solution, and the reduction rate of the reduced diameter portion is switched to a smaller state, so that the pressure loss is reduced in a low flow rate state. However, pressure loss can be increased in a high flow rate state, and a stable mixed concentration can be maintained over a wide range of the extinguishing agent supply amount.
Furthermore, since the above invention stabilizes the mixing concentration by the variable means including the case portion (specifically, the cylinder portion), the piston portion, and the elastic body, the production cost can be further reduced as compared with the conventional example. Productivity can be improved.

Furthermore, since the invention according to claim 1 switches the pressure loss by closing a part of the plurality of diameter-reduced portions, a stable mixing concentration is maintained in a wide range of the extinguishing agent supply amount with a simple configuration. It becomes possible to do.
Further, each diameter reduction ratio before and after the switching can be set depending on the number of diameter reducing portions, and each pressure loss can be easily set.

The invention described in claim 2 has the same configuration as that of the invention described in claim 1 except for the reduced diameter portion, and the reduced diameter portion is partially blocked by the movement of the piston portion due to the flow of the extinguishing agent stock solution. Since the pressure loss is switched by closing a part of the reduced diameter part, it is very easy to process each reduced diameter part, dramatically reducing the production cost and productivity of the device. Can be improved.

[First embodiment]
(overall structure)
A fire extinguishing agent flow controller 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. The fire extinguisher flow rate adjuster 10 is installed in a building and is provided in a fire extinguisher mixing device 50 of a fire extinguishing facility that radiates a fire extinguisher aqueous solution from a discharge port. FIG. 1 is an overall configuration diagram of a fire extinguisher mixing apparatus 50.
The fire extinguisher mixing device 50 has the same configuration as the above-described fire extinguisher mixing device 100 (see FIG. 7) except for the fire extinguisher flow rate adjuster 10, and the same components are denoted by the same reference numerals. Thus, duplicate description is omitted.

(Extinguishing agent flow controller: Overall)
FIG. 2 is a cross-sectional view taken along the center line of the extinguishing agent flow controller 10, FIG. 2 (A) shows a state where the flow rate of the extinguishing agent is small, and FIG. 2 (B) shows a state where the flow rate of the extinguishing agent is large. Show.
The extinguishing agent flow rate adjuster 10 includes a case part 20 through which the extinguishing agent stock solution passes, a piston part 30 supported in the case part 20 so as to be able to move forward by the passage of the extinguishing agent stock solution, and a backward movement direction of the piston part 30. And a coil spring 40 as an elastic body for urging the spring.
Hereinafter, each part will be described in detail.

(Fire extinguishing agent flow controller: Case part)
The case part 20 includes a cylinder part 21 and a cover part 22 attached to the outside of the cylinder part 21.
The cylinder portion 21 is formed in a cylindrical shape with one end portion (left end portion in FIG. 2) closed, and a fire-extinguishing agent inlet 23 is formed at the center of the closed end surface. The downstream end of the extinguishing agent side pipe 105 in the extinguishing agent supply direction is connected to the inflow port 23. That is, the extinguishing agent stock solution flows into the case portion 20 from the inflow port 23.
A screw groove is formed on the outer peripheral surface of the cylinder portion 21, and a cover portion 22 having a screw groove formed on the inner peripheral surface can be screwed and mounted correspondingly.

  The cover portion 22 is formed in a cylindrical shape with one end portion (the right end portion in FIG. 2) closed, and a first reduced diameter which is a circular opening portion penetrating perpendicularly to the end surface at the center portion of the closed end surface. A portion 24 is formed. In addition, a cylindrical nozzle 25 communicating with the first reduced diameter portion 24 and having a diameter larger than that of the first reduced diameter portion 24 is formed outside the closed end surface. The cylindrical nozzle 25 is connected to the narrow portion 101 a of the mixer 101.

As described above, the cover portion 22 has a thread groove formed on its inner peripheral surface, and is screwed to the cylinder portion 21 to form a cylindrical body having a uniform inner diameter. Further, an O-ring 26 is inserted between the outer peripheral surface of the cylinder part 21 and the inner peripheral surface of the cover part 22, so that watertightness between the cylinder part 21 and the cover part 22 is maintained.
The first reduced diameter portion 24 is smaller in diameter than the inner diameter of the case portion 20, and is adjusted so that the flow rate becomes a predetermined flow rate with respect to the extinguishing agent stock solution passing through the first reduced diameter portion 24. It has a structure.

(Fire extinguishing agent flow controller: piston part)
The piston part 30 is stored inside the case part 20. The piston portion 30 has a cylindrical shape, one end portion (right end portion in FIG. 2) is closed, and a flange portion 31 is formed at the other end portion (left end portion in FIG. 2).
The flange portion 31 has an outer diameter set substantially equal to the inner diameter of the cylinder portion 21, and the outer peripheral surface of the flange portion 31 moves along the inner peripheral surface of the cylinder portion 21. Guides forward and backward movement along the direction. Further, an O-ring 32 is interposed between the outer peripheral surface of the flange portion 31 and the inner peripheral surface of the cylinder portion 21, and the extinguishing agent flows out from the outer periphery of the piston portion 30 toward the first reduced diameter portion 24. Is preventing.
In the fire extinguisher flow rate regulator 10, the downstream side in the flow direction of the extinguishing agent is referred to as the “front” side (secondary side), and the upstream side is referred to as the “rear” side (primary side). .
In this embodiment, the O-ring 32 is attached between the piston part 30 and the cylinder part 21 in order to ensure water-tightness, but water-tight means other than the O-ring may be installed. Further, the O-ring 32 can be omitted by appropriately designing the dimensions of the contact portion between the piston portion 30 and the cylinder portion 21.

Further, a circular opening 33 is formed at the center of the closed end face of the piston portion 30, and openings 34 and 35 having a smaller diameter than the opening 33 are formed on both sides of the opening 33. . Each of the openings 33, 34, and 35 is formed so as to vertically penetrate the closed end face of the piston portion 30. A second reduced diameter portion 36 is configured by these openings 33, 34, and 35.
In the case portion 20, the extinguishing agent stock solution flowing in from the inlet 23 flows into the piston portion 30 from the end portion on the flange portion 31 side, and the extinguishing agent stock solution having a uniform inner diameter up to the closed end portion. It becomes this flow path.
On the other hand, since the opening area of the second reduced diameter portion 36 (total opening area of the openings 33, 34, and 35) is smaller than the cross-sectional area inside the piston portion 30, the second reduced diameter portion 36 passes through the second reduced diameter portion 36. The flow rate of the extinguishing agent stock solution is adjusted to a predetermined flow rate.

The piston part 30 is disposed in the cylinder part 21 so that the center lines of the piston part 30 are on the same axis, and the piston part 30 can move forward and backward along the direction of the center line. And the piston part 30 can be brought into close contact with the inner front end face of the cover part 22 by moving to the most advanced position.
On the other hand, when the piston 30 is viewed from the front, the central opening 33 of the second reduced diameter portion 36 is located at the center thereof, and the both side openings 34 and 35 are disposed at a predetermined distance from the center. .
That is, in the state where the front end surface of the piston portion 30 is in close contact with the inner surface of the front end of the cover portion 22, the first reduced diameter portion 24 and the central opening portion 33 of the second reduced diameter portion 36 arranged concentrically are: It will be in the state which superposed | polymerized mutually. On the other hand, both side openings 34 and 35 of the second reduced diameter portion 36 are arranged outside the first reduced diameter portion 24 by a distance that does not cause any polymerization. With this arrangement, both side openings 34 and 35 are closed by the inner front end face of the cover part 22.

That is, when the piston part 30 is not located at the most forward position, the extinguishing agent stock solution that has flowed into the piston part 30 can pass through all the openings 33, 34, and 35 of the second reduced diameter part 36. When located at the most forward position, the extinguishing agent stock solution that has flowed into the piston portion 30 can pass only through the central opening 33 of the second reduced diameter portion 36.
The total opening area formed by the three openings 33, 34, and 35 of the second reduced diameter portion 36 is set smaller than the opening area of the first reduced diameter portion 24.

(Fire extinguishing agent flow controller: coil spring)
The coil spring 40 is in contact with the flange portion 31 in a state where the piston portion 30 is inserted in the case portion 20, and presses the piston portion 30 toward the inlet 23. Accordingly, the extinguishing agent stock solution flows from the inlet 23 and the piston part 30 is moved forward in a state where the pressure exceeds the pressing force of the coil spring 40.
Further, as described above, the diameter reduction rate is switched when the piston portion 30 reaches the most advanced position (from the state in which all the openings 33, 34, 35 of the second diameter reduction portion 36 can circulate to the center). One of the factors for determining the flow rate of the extinguishing agent stock solution for the piston 30 to reach the most advanced position is the spring constant of the coil spring 40. Therefore, an appropriate value is selected as the spring constant of the coil spring 40 based on the extinguishing agent stock solution flow rate at which the diameter reduction rate should be switched.

(Explanation of fire extinguishing agent flow controller)
The operation of the extinguishing agent flow rate regulator 10 having the above configuration will be described based on the operation of the extinguishing agent mixing apparatus 50.
The fire extinguisher mixing device 50 is operated, and a differential pressure is generated between the inlet portion 101b and the narrow portion 101a as the water flow in the mixer 101 is generated by opening the discharge port.
As a result, the internal pressure of the pressurized water region of the fire extinguishing agent storage pressurization tank 102 increases through the pressurized water side pipe 104, and the extinguishing agent stock solution is pushed out of the extinguishing agent storage pressurization tank 102 through the internal diaphragm. Then, the extinguishing agent stock solution flows into the inside from the inflow port 23 of the extinguishing agent flow rate regulator 10 through the extinguishing agent side pipe 105.

When the flow rate of the water flow in the mixer 101 is small, the flow rate of the extinguishing agent stock solution also becomes small. In this case, in the case part 20 of the extinguishing agent flow rate regulator 10, as shown in FIG. Maintains the last retracted position by the pressing force of the coil spring 40. The extinguishing agent stock solution passes through all the openings 33, 34, and 35 of the second reduced diameter portion 36, and further passes through the first reduced diameter portion 24 before being fed into the narrow portion 101 a of the mixer 101, and the fire extinguishing pipe. It is mixed with running water in the main pipe 103.
At this time, the total opening area of the second reduced diameter portion 36 ensures a flow rate that reaches the target mixed concentration even when the extinguishing agent stock solution is at a low flow rate that cannot move the piston portion 30 to the most advanced position. The size is set such that only a possible pressure loss is generated, so that the target concentration of the fire extinguisher solution supplied to the outlet is maintained.

When the flow rate of the water flow in the mixer 101 increases, the flow rate of the extinguishing agent stock solution also increases, and the piston portion 30 starts moving forward in the case portion 20 of the extinguishing agent flow rate regulator 10. When the extinguishing agent stock solution reaches a predetermined flow rate, the piston portion 30 reaches the most advanced position against the pressing force of the coil spring 40 as shown in FIG.
As a result, the openings 34 and 35 on both sides of the second reduced diameter portion 36 are closed, and the extinguishing agent stock solution passes only through the central opening 33 and further passes through the first reduced diameter portion 24 before narrowing the mixer 101. It is fed into the section 101a and mixed with running water in the fire extinguishing pipe main pipe 103.
At this time, even when the opening area of the central opening 33 of the second reduced diameter portion 36 increases to exceed the flow rate at which the extinguishing agent stock solution can move the piston portion 30 to the most advanced position, the target mixed concentration Is set to a value that causes a pressure loss that can prevent the waste of the extinguishing agent stock solution from being greatly exceeded, so that the extinguishing agent solution supplied to the outlet does not greatly exceed the target concentration and Waste of the extinguishing agent stock solution is also avoided.

  As described above, the superposed state and the non-polymerized state of the first reduced diameter portion 24 and the second reduced diameter portion 36 are switched according to the flow rate of the extinguishing agent stock solution by the cooperation of the case portion 20, the piston portion 30, and the coil spring 40. It is done. That is, the configuration of the case portion 20, the piston portion 30, and the coil spring 40 is such that the diameter reduction ratio of the reduced diameter portion (here, the first reduced diameter portion 24 and the second reduced diameter portion 36) according to the flow rate of the extinguishing agent stock solution (where, “Reducing diameter ratio” means, for example, functioning as a variable means that variably adjusts the ratio of the area of the inner front end surface of the piston portion 30 to the total opening area of the flowable opening of the second reduced diameter portion 36). Become.

(Effect of the first embodiment)
As described above, the fire extinguisher flow rate adjuster 10 is supplied in a low pressure loss state through the entire openings 33, 34, and 35 in the second reduced diameter portion 36 when the extinguishing agent stock solution has a low flow rate. When the extinguishing agent stock solution is at a high flow rate, only the central opening 33 is allowed to pass, and supply is performed in a high pressure loss state. For this reason, it is possible to avoid excessive supply of fire extinguishing agent when the water supply flow rate increases while avoiding shortage of supply amount of fire extinguishing agent when the water supply flow rate is small. It becomes possible to maintain a stable mixing concentration in a range.
This also prevents the extinguishing agent stock solution from being excessively supplied when the water supply flow rate is increased in the fire extinguishing agent mixing device 50, thereby preventing waste of the extinguishing agent stock solution. Further, along with this, it becomes possible to continue the discharge of the extinguishing agent solution during the set release time without increasing the size of the extinguishing agent storage pressure tank 102 of the extinguishing agent mixing apparatus 50.
Further, the extinguishing agent flow rate regulator 10 stabilizes the mixing concentration with a simple configuration having the cylinder portion 20, the piston portion 30 and the coil spring 40 as main components, thereby reducing the production cost of the apparatus and improving the productivity. It is possible to improve.

  Further, the extinguishing agent flow rate regulator 10 is provided with the openings 33, 34, 35 of the second reduced diameter portion 36 on the front end surface of the piston portion 30, and the first contraction on the inner front end surface of the facing cover portion 22. Since the diameter portion 24 is provided and the diameter reduction rate is switched when the piston portion 30 reaches the most advanced position, it is possible to switch the pressure loss step by step. For this reason, when there is insufficient supply or excessive supply of the extinguisher stock solution at a certain flow rate value, it is possible to maintain a more appropriate and stable mixed concentration by switching the diameter reduction rate at the flow rate value. Is possible.

(Other)
Both side openings 34 and 35 may be provided on any of the front end surfaces of the piston portion 30 as long as they do not overlap with the first reduced diameter portion 24.
Moreover, both the opening part which superposes | polymerizes and the opening part which does not superpose | polymerize with the 1st reduced diameter part 24 are provided, and when a fire extinguisher stock solution passes all the opening parts, and the case where only the opening part which superpose | polymerizes passes, As long as a predetermined mixed concentration can be maintained according to the supply flow rate of the stock solution, the number of each opening portion of the second reduced diameter portion 36 may be one or more.

Furthermore, the total opening area of the second reduced diameter portion 36 or the opening area of each opening is not limited to a specific value. However, these values may vary depending on use conditions, design conditions, etc., so the mixed concentration is maintained in a well-balanced manner in a small flow rate zone in which it is difficult to satisfy the target mixed concentration and a flow rate zone in which excessive supply is likely to occur. It is desirable to obtain the total opening area of the second reduced diameter part 36 or the opening area of each opening part by testing or simulation.
Further, the spring constant of the coil spring 40 is not limited to a specific value. However, this value is one factor for determining the flow rate of the extinguishing agent stock solution in which the diameter reduction rate of the reduced diameter part is switched (the piston part 30 is at the most advanced position). Is preferably determined according to the target flow rate of the extinguishing agent stock solution to be switched. Further, as described above, it may be determined by a test or simulation.

  The piston 30 may be provided with a seal or packing on the surface of the front end surface excluding the second reduced diameter portion 36 in order to ensure sealing performance when reaching the most advanced position. Or you may provide a seal | sticker and packing in the surface except the 1st diameter reduction part 24 of the inner front end surface of the cover part 22. FIG.

[Second Embodiment]
A fire extinguishing agent flow controller 10A according to the second embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view taken along the center line of the extinguishing agent flow controller 10A. This fire extinguishing agent flow controller 10A includes a first reduced diameter portion 24A formed of a plurality of openings 27A, 28A, and 29A and a second reduced diameter portion formed of a single opening. Only the point that 36A is formed in the piston portion 30A is different from the fire extinguisher flow rate adjuster 10 described above, and other identical configurations are denoted by the same reference numerals as the fire extinguisher flow rate adjuster 10 and redundant descriptions are provided. Shall be omitted. Further, the extinguishing agent flow rate adjuster 10 </ b> A is also provided in the extinguishing agent mixing device 50 (see FIG. 1) in the same manner as the extinguishing agent flow rate adjuster 10.

The second reduced diameter portion 36A is formed at the center of the piston portion 30A. On the other hand, the central opening portion 27A of the first reduced diameter portion 24A is formed at the center of the cover body 22A, and the both side opening portions 28A and 29A overlap with the second reduced diameter portion 36A even when the piston portion 30A advances to the most advanced position. It is formed away from the center by a distance that cannot cause
The opening area of the second reduced diameter portion 36A is set to be equal to or smaller than the opening area of the central opening portion 27A of the first reduced diameter portion 24A that causes polymerization.

The extinguishing agent flow rate adjuster 10A is pressed by the coil spring 40 at the stage where the extinguishing agent mixing device 50 starts operating and the flow rate of the flowing water in the mixer 101 and the supply flow rate of the extinguishing agent stock solution are still small, and the piston part 30A. Maintains the retracted position. That is, the extinguishing agent stock solution passes through all the openings 27A, 28A, 29A of the second reduced diameter portion 36A and the first reduced diameter portion 24A, and is supplied into the mixer 101 in a low pressure loss state. Accordingly, the fire extinguisher solution is discharged from the discharge port without falling below the planned mixed concentration.
Further, when the flowing water flow rate in the mixer 101 and the supply flow rate of the extinguishing agent stock solution increase, the piston portion 30 </ b> A starts moving against the coil spring 40. When the piston portion 30A reaches the most advanced position due to further increase in the flow rate of the flowing water and the supply flow rate of the extinguishing agent stock solution, the extinguishing agent stock solution is only the central opening portion 27A of the second reduced diameter portion 36A and the first reduced diameter portion 24A. And is fed into the mixer 101 in a high pressure loss state. Therefore, the supply of the excessive amount of the fire extinguisher is suppressed without being lower than the planned mixed concentration, and the extinguishing agent stock solution having an appropriate concentration is discharged from the discharge port.

In this way, the extinguishing agent flow rate adjuster 10 </ b> A can obtain substantially the same effect as the extinguishing agent flow rate adjuster 10. That is, it is possible to avoid excessive supply of fire extinguishing agent when the water supply flow rate is increased while avoiding shortage of fire extinguishing agent supply amount when the water supply flow rate is low. This makes it possible to maintain a stable mixing concentration. This also prevents waste of the extinguishing agent stock solution, and it is possible to continue releasing the extinguishing agent solution during the set release time.
In addition, the extinguishing agent flow controller 10A, like the extinguishing agent flow controller 10, stabilizes the mixed concentration with a simple configuration, so that the production cost of the apparatus can be reduced and the productivity can be improved. It becomes.

[Third embodiment]
A fire extinguishing agent flow controller 10B according to a third embodiment will be described with reference to FIG. FIG. 4 is a cross-sectional view taken along the center line of the extinguishing agent flow controller 10B. In this fire extinguishing agent flow controller 10 </ b> B, a second reduced diameter portion 36 </ b> B consisting of a single opening is formed in the piston portion 30 </ b> B, and the second reduced diameter portion 36 </ b> B is somewhat smaller than the first reduced diameter portion 24. Only the point where they are shifted from each other is different from the above-described extinguishing agent flow rate regulator 10, and the same reference numerals as those of the extinguishing agent flow rate regulator 10 are assigned to the other identical configurations, and redundant description is omitted. The extinguishing agent flow rate adjuster 10B is also provided in the extinguishing agent mixing device 50 (see FIG. 1) in the same manner as the extinguishing agent flow rate adjusting unit 10.

The second reduced diameter portion 36B is formed at a position somewhat deviated from the center of the piston portion 30B. That is, when the piston portion 30B reaches the most advanced position, a part of the second reduced diameter part 36B and a part of the first reduced diameter part 24 are arranged to overlap. That is, in other words, by closing the portions of the first reduced diameter portion 24 and the second reduced diameter portion 36B that are not overlapped with each other, when the piston portion 30B reaches the most advanced position, the diameter reduction ratio is switched to a smaller value. It will be.
The opening area of the second reduced diameter portion 36 </ b> B is desirably set to be equal to or smaller than the opening area of the first reduced diameter portion 24.

The extinguishant flow rate adjuster 10B is pressed by the coil spring 40 at the stage where the extinguishing agent mixing device 50 starts to operate and the flow rate of the flowing water in the mixer 101 and the supply flow rate of the extinguishing agent stock solution are still small, and the piston portion 30B. Maintains the retracted position. That is, the extinguishing agent stock solution passes through the second reduced diameter portion 36B and the first reduced diameter portion 24 and is supplied into the mixer 101 in a low pressure loss state. Accordingly, the fire extinguisher solution is discharged from the discharge port without falling below the planned mixed concentration.
Moreover, when the flowing water flow rate in the mixer 101 and the supply flow rate of the extinguishing agent stock solution increase, the piston portion 30 </ b> B starts moving forward against the coil spring 40. When the piston portion 30B reaches the most advanced position by further increasing the flow rate of the flowing water and the supply flow rate of the extinguishing agent stock solution, the extinguishing agent stock solution is only in a range in which the second reduced diameter portion 36B and the first reduced diameter portion 24 overlap each other. And is fed into the mixer 101 in a high pressure loss state. Therefore, the supply of the excessive amount of the fire extinguisher is suppressed without being lower than the planned mixed concentration, and the extinguishing agent stock solution having an appropriate concentration is discharged from the discharge port.

As described above, the extinguishing agent flow rate controller 10 </ b> B can obtain substantially the same effect as the extinguishing agent flow rate regulator 10. That is, it is possible to avoid excessive supply of fire extinguishing agent when the water supply flow rate is increased while avoiding shortage of fire extinguishing agent supply amount when the water supply flow rate is low. This makes it possible to maintain a stable mixing concentration. This also prevents waste of the extinguishing agent stock solution, and it is possible to continue releasing the extinguishing agent solution during the set release time.
In addition, the extinguishing agent flow controller 10B, like the extinguishing agent flow controller 10, stabilizes the mixed concentration with a simple configuration, so that the production cost of the apparatus can be reduced and the productivity can be improved. It becomes.

[Fourth embodiment]
A fire extinguishing agent flow controller 70 according to a fourth embodiment of the present invention will be described with reference to FIG. The fire extinguisher flow rate adjuster 70 is installed in a building and is provided in a fire extinguisher mixing device 60 of a fire extinguishing facility that radiates a fire extinguisher aqueous solution from a discharge port. FIG. 5 is an overall configuration diagram of the fire extinguisher mixing device 60.
The fire extinguisher mixing device 60 has the same configuration as the above-described fire extinguisher mixing device 100 (see FIG. 7) except for the fire extinguisher flow rate regulator 70, and the same components are denoted by the same reference numerals. Thus, duplicate description is omitted.

  The extinguishing agent flow rate regulator 70 connects the extinguishing agent storage pressurization tank 102 to the mixer 101 and has a pipe 71 in which a section in the middle is branched into three, and the extinguishing agent before the branch point of the pipe 71. A flow rate sensor 79 for detecting the flow rate of the stock solution, first to third reduced diameter portions 72, 73, 74 provided for each branch section of the pipe 71, and a fire extinguisher stock solution provided for each branch section of the pipe 71 As a variable means for performing switching control of the electromagnetic valves 75, 76, 77 according to the detected flow rate of the flow rate sensor 79 and the electromagnetic valves 75, 76, 77 that can be switched between a flowable state and a flow stop state of the flow rate sensor 79. The control device 78 is provided.

  The pipe 79 has an upstream end connected to the extinguishing agent storage pressurization tank 102, and a flow sensor 79 is provided on the downstream side. Further, the pipe 71 is branched into three on the downstream side of the flow sensor 79, and an electromagnetic valve 75 and a first reduced diameter portion 72 are provided in the first branch path, and the second branch path is provided with the second branch path. The electromagnetic valve 76 and the second reduced diameter portion 73 are provided, and the electromagnetic valve 77 and the third reduced diameter portion 74 are provided in the third branch path. And each branch path merges on the downstream side to become one, and the downstream end portion is connected to the narrow portion 101 a of the mixer 101.

The first to third reduced diameter portions 72, 73, and 74 are provided with orifices in the inside thereof in the same manner as the extinguishing agent flow rate regulator 106 (see FIG. 9), and have an orifice diameter with respect to the extinguishing agent stock solution passing through the inside. It has a structure that generates a corresponding pressure loss. The first reduced diameter portion 72 has the largest orifice diameter, the second reduced diameter portion 73 has the largest orifice diameter, and the third reduced diameter portion 74 has the smallest orifice diameter.
The orifice diameter of the first reduced diameter portion 72 corresponds to the smallest flow rate range among the three ranges of the supply flow rate of the extinguishing agent stock solution to be supplied to the extinguisher mixing device 60, and the second reduced size. The orifice diameter of the diameter portion 73 corresponds to the second smallest flow range among the three sections, and the orifice diameter of the third reduced diameter portion 74 corresponds to the largest flow range among the three sections. .
And the orifice diameter of each reduced diameter part is set to the internal diameter of the grade which can implement | achieve the target mixing concentration in each fire extinguisher stock solution flow rate range.

The flow sensor 79 detects the extinguishing agent stock solution flow rate at the corresponding location and outputs a detection signal corresponding to the detected flow rate to the control device 78.
The control device 78 includes a memory that stores a predetermined processing program and a flow rate table, and an arithmetic unit that executes the processing program.
That is, in the flow rate table, the above-described entire range of the supply flow rate of the extinguishing agent stock solution is divided into three, and the flow rate range for each division, and which electromagnetic valve 75, 76, 77 corresponds to each flow rate range. Is shown. Then, the control device 78 reads the flow rate table from the memory, determines to which flow range the flow rate detected by 79 belongs to the flow rate sensor, and executes operation control to open only one corresponding electromagnetic valve.
That is, the control device 78 selects and opens an electromagnetic valve corresponding to the flow rate of the supply flow rate from the extinguishing agent storage pressurization tank 102, and opens the reduced diameter portions 72, 73, 74 according to the flow rate. It is possible to choose either.

When the fire extinguisher mixing device 50 starts operation, the fire extinguisher flow rate regulator 70 first opens all the electromagnetic valves 72, 73, 74 as an initial operation, and the flow rate of running water in the mixer 101 is still small, and the extinguishing agent stock solution When the supply flow rate is still small, only the electromagnetic valve 72 is opened according to the supply flow rate. That is, the extinguishing agent stock solution passes through the first reduced diameter portion 72 and is supplied into the mixer 101 in a low pressure loss state. Accordingly, the fire extinguisher solution is discharged from the discharge port without falling below the planned mixed concentration.
When the flow rate of the flowing water in the mixer 101 is slightly increased and the supply flow rate of the extinguishing agent stock solution is slightly increased, only the electromagnetic valve 73 is opened according to the supply flow rate. That is, the extinguishing agent stock solution passes through the second reduced diameter portion 73 and is supplied into the mixer 101 in a predetermined pressure loss state. Accordingly, the fire extinguisher solution is discharged from the discharge port without falling below the planned mixing concentration and without excessively high concentration.
Furthermore, when the flow rate of the flowing water in the mixer 101 rises and the supply flow rate of the extinguishing agent stock solution further increases, only the electromagnetic valve 74 is switched according to the supply flow rate. That is, the extinguishing agent stock solution passes through the third reduced diameter portion 74 and is supplied into the mixer 101 in a high pressure loss state. Accordingly, the fire extinguisher solution is discharged from the discharge port without becoming excessively high with respect to the planned mixed concentration.

In this way, the extinguishing agent flow rate regulator 70 can also obtain substantially the same effect as the extinguishing agent flow rate regulator 10. That is, it is possible to avoid excessive supply of fire extinguishing agent when the water supply flow rate is increased while avoiding shortage of fire extinguishing agent supply amount when the water supply flow rate is low. This makes it possible to maintain a stable mixing concentration. This also prevents waste of the extinguishing agent stock solution, and it is possible to continue releasing the extinguishing agent solution during the set release time.
Also, the extinguishing agent flow rate regulator 70 does not need a plurality of mixers 101 and the mixture concentration is stabilized by a simple configuration, so that the production cost of the apparatus can be reduced and the productivity can be improved. It becomes.

In the above-mentioned extinguishing agent flow rate regulator 70, the diameter reduction ratios of the respective reduced diameter portions 72, 73, and 74 are controlled to select an appropriate one according to the flow rate. When the flow rate of the extinguishing agent stock solution is small and the flow rate of the extinguishing agent stock solution is small, it is possible to circulate more of the reduced diameter part, and the number of reduced diameter parts that can be circulated according to the increase in the flow rate of the extinguishing agent stock solution You may perform control to reduce.
Further, even when a plurality of reduced diameter portions having different diameter reduction ratios are used, by combining them, control may be performed so that the diameter reduction ratio becomes smaller with respect to an increase in the flow rate of the extinguishing agent stock solution. good.

[Relationship between the flow rate of the main pipe of the fire extinguishing pipe and the concentration of the extinguishing agent by the extinguishing agent flow regulator]
Using the fire extinguisher flow rate adjuster 10 described above, a test for determining the relationship between the flow rate of the fire extinguishing pipe main pipe 103 (horizontal axis) and the mixed concentration of the fire extinguishing agent (vertical axis) was performed, and the results are shown in FIG. Show.
In the above test, the inner diameter of the central opening 33 of the second reduced diameter portion 36 of the extinguishing agent flow regulator 10 is 3.3 [mm], the inner diameters of the side openings 34 and 35 are 2.5 [mm], and the first reduced diameter. A part 24 having an internal diameter of 11.0 [mm] and a spring constant of the coil spring of 4.18 [N / mm] was used, and the result is shown by a broken line L3. Note that the range below the main pipe flow rate of 60 [l / min] was not used, so it was out of the test target range, and the description of the results was omitted.
For comparison, the internal diameter of the opening of the same structure as that of the conventional fire extinguishing agent flow regulator 106 is maintained so that the mixed concentration of 1.5% can be substantially maintained in the main pipe flow rate of 300 to 900 [l / min]. A comparative example in which the internal diameter of the opening is adjusted so that the mixed concentration can exceed 1.5% even in a band of 300 [l / min] or less in the main pipe flow rate is shown in a broken line L2.
According to the above test, the extinguishing agent flow rate regulator 10 can obtain a high mixing concentration in the range where the piston portion 30 has not yet started to advance in the band of the main pipe flow rate of 60 to 150 [l / min]. it can. When 150 [l / min] is exceeded, the piston part 30 starts moving forward and the amount of the extinguishing agent is gradually limited. At 300 [l / min], the piston part 30 reaches the most advanced position and the diameter reduction rate is reached. Is switched. And in the zone | band of the main pipe flow rates 300-900 [l / min], it becomes possible to maintain stably 1.5% of mixture density similarly to the conventional extinguishing agent flow volume regulator 106. FIG.
In addition, when the extinguishing agent flow rate regulator 10 is used, it is higher than the target mixing concentration in the main pipe flow rate of 60 to 300 [l / min], but the flowing water flow rate flowing through the mixer 101 is small. The absolute amount of extinguishing agent put into the mixer 109 is also small. Therefore, the consumption of the fire extinguishing agent does not cause an influence that cannot be maintained within the set release time.
In addition, when the main pipe flow rate is 900 [l / min], the target concentration is slightly higher than the target concentration. Therefore, the set discharge time is set even if the amount of extinguishing agent stored in the extinguishing agent storage pressurization tank 102 is not estimated more than necessary. The release can be continued during.
In addition, in the extinguishing agent flow rate adjuster 10, the target concentration is slightly exceeded in the band of the main pipe flow rate of 60 to 300 [l / min], but this can be further reduced by adjusting the internal diameters of the openings 34 and 35 on both sides. It is possible to plan.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram of a fire extinguisher mixing apparatus provided with the fire extinguisher flow volume regulator which is 1st embodiment of this invention. FIG. 2A is a cross-sectional view taken along the center line of the extinguishing agent flow rate regulator, FIG. 2A shows a state where the flow rate of the extinguishing agent is small, and FIG. 2B shows a state where the flow rate of the extinguishing agent is large. It is sectional drawing along the centerline of the fire extinguisher flow regulator which is 2nd embodiment of this invention. It is sectional drawing along the centerline of the fire extinguisher flow regulator which is 3rd embodiment of this invention. It is a whole block diagram of a fire extinguisher mixing apparatus provided with the fire extinguisher flow volume regulator which is 4th embodiment of this invention. It is a diagram which shows the result of the test which calculated | required the relationship between the flow volume of a fire extinguishing piping main pipe, and the mixed concentration of a fire extinguisher using the fire extinguisher flow volume regulator which is 1st embodiment. It is a whole block diagram of a fire extinguishing agent mixing apparatus provided with the conventional extinguishing agent flow volume regulator. It is sectional drawing along the centerline of the mixer and the extinguishing agent flow regulator which were disclosed in FIG. It is sectional drawing along the centerline of the fire extinguisher flow regulator disclosed in FIG.

Explanation of symbols

10, 10A, 10B, 70 Fire extinguisher flow regulator 20, 20A Case portions 24, 24A, 72 First reduced diameter portions 27A, 33 Central opening portions 28A, 29A, 34, 35 Both side opening portions 30, 30A, 30B Piston portions 36, 36A, 36B, 73 Second reduced diameter portion 40 Coil spring (elastic body)
50, 60 Fire extinguisher mixing device 71 Pipe 74 Third reduced diameter portion 78 Control device (variable means)
102 Extinguishing media storage tank

Claims (2)

A fire extinguisher that adjusts the supply flow rate of the extinguishing agent stock solution in order to adjust the concentration of the extinguishing agent aqueous solution in a fire extinguisher mixing device that supplies and mixes the extinguisher stock solution to the flowing water sent to the discharge port for performing fire extinguishing A flow regulator,
A reduced diameter portion formed narrower than the flow path of the extinguishing agent stock solution located on the upstream side,
In accordance with the supply flow rate of the extinguishing agent stock solution, a variable means for variably adjusting the diameter reduction rate of the reduced diameter portion by closing a part of the reduced diameter portion when the supply flow rate is high and opening a part when the supply flow rate is low. When,
Equipped with a,
The variable means includes a case portion into which the extinguishing agent stock solution flows, a piston portion that is movably supported by the inflow of the extinguishing agent stock solution in the case portion, and a moving direction of the piston portion due to the inflow of the extinguishing agent stock solution. And an elastic body that is biased in the opposite direction, and adjusting the reduction ratio of the reduced diameter portion by moving the piston portion,
The reduced diameter portion includes a plurality of reduced diameter portions arranged in parallel, and is formed in an arrangement in which a part of the plurality of reduced diameter portions is blocked by the movement of the piston portion due to the inflow of the extinguishing agent stock solution. extinguishing agent flow regulator, characterized in that there. A fire extinguisher that adjusts the supply flow rate of the extinguishing agent stock solution in order to adjust the concentration of the extinguishing agent aqueous solution in a fire extinguisher mixing device that supplies and mixes the extinguisher stock solution to the flowing water sent to the discharge port for performing fire extinguishing A flow regulator,
A reduced diameter portion formed narrower than the flow path of the extinguishing agent stock solution located on the upstream side,
In accordance with the supply flow rate of the extinguishing agent stock solution, a variable means for variably adjusting the diameter reduction rate of the reduced diameter portion by closing a part of the reduced diameter portion when the supply flow rate is high and opening a part when the supply flow rate is low. When,
With
The variable means includes a case portion into which the extinguishing agent stock solution flows, a piston portion that is movably supported by the inflow of the extinguishing agent stock solution in the case portion, and a moving direction of the piston portion due to the inflow of the extinguishing agent stock solution. And an elastic body that is biased in the opposite direction, and adjusting the reduction ratio of the reduced diameter portion by moving the piston portion,
The reduced diameter portion, the fire extinguishing agent stock solution extinguishing agent flow regulator you wherein a portion is formed in an arrangement which is closed in the reduced diameter portion by the movement according to the inflow of the piston portion.

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