JP2000033129A - Flash sprinkler head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce manufacturing cost by reducing the number of parts, miniaturizing a sprinkler head and facilitating its assembly. SOLUTION: A first annular tapered face having a first taper angle β in a horizontal direction is formed on the outer periphery on an opened side of a nozzle 8, and a second annular tapered face having a second taper angle γopposite to the first tapered face is formed on the inner edge of an opened end where the nozzle tip of a head body 2 is exposed. A plurality of balls 50 is arranged between the first tapered face and the second tapered face 62. In a normal supervisory state, the ball 50 fixedly holds the nozzle part 8 to the head body 2 through a heat sensitive decomposition section 4, and in the case where the section 4 is thermally decomposed on account of a fire, a pushing pressure caused by the first tapered face acts on the ball 50 to move it in the outer peripheral direction of the head body 2 on the second tapered face for rotatably supporting the lowered nozzle part 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush type sprinkler head nozzle for spraying fire extinguishing water by dropping a nozzle tip from a head body when a fire occurs.
In particular, the present invention relates to a flush type sprinkler head nozzle for spraying fire extinguishing water while rotating a nozzle portion.

[0002]

2. Description of the Related Art A conventional flash sprinkler head of this type is disclosed, for example, in Japanese Patent Application Laid-Open No. 58-69583.

[0003] In this flush type sprinkler head, a valve body assembly provided with a deflector is normally stored in the head body and supported by a thermal decomposition part to close a water spout, and when a fire is detected, the thermal decomposition part is normally used. The valve body assembly falls down to a certain distance to open a water spout, and the fire extinguishing water squirted on the valve body assembly is collided, and the fire extinguishing water is dispersed by a deflector to spray water in a granular state.

However, in such a conventional flash type sprinkler head, a continuous flow of a predetermined flow rate of, for example, 80 liter / min or more per one nozzle is required, so that the fire extinguishing ability is relatively large. Of fire extinguishing water is necessary, and naturally it is radiated to objects other than the fire extinguishing target.
There was a problem that the so-called water damage increased. In addition, in terms of equipment, there is a problem that the capacity of the water tank and the pump becomes large, the pipe size becomes large, and the cost of the whole equipment becomes high.

In a conventional flash sprinkler head, water is dispersed by a deflector and granulated to spray water uniformly over the entire protection area. Therefore, in the event of a strong fire, the dispersed water has a small particle size, so it evaporates before it reaches the deep part of the fire, losing the air current of the fire, it takes time to suppress the fire, and it can not be extinguished at all Sometimes. This increases the amount of water,
Damage caused by flood damage will also increase.

Further, from a certain point in the protection range,
Even if the fire of a single point is momentarily weakened by the granular water, the water once applied by the flame near the point evaporates and starts burning again with the nearby flame. Therefore, it takes time to completely extinguish the fire.

Therefore, the inventor of the present invention reduced water loss by reducing the amount of radiation per fire-extinguishing spray nozzle while ensuring fire-extinguishing capability, as shown in FIG.
Japanese Patent Application No. Hei 9-173610 proposes a nozzle swivel type flush type sprinkler head capable of reducing the installation cost by reducing the capacity of a water tank, a pump, and the like.
issue).

In FIG. 11, a flash type sprinkler head 1 is provided with a swivelable nozzle portion 8 having a slit 10 in a nozzle body 2. Road 5 is held in a closed position.

When the temperature reaches a predetermined temperature due to a fire, the thermosensitive decomposition section 4 is thermally decomposed and falls off, and as shown in FIG. Open and flush with fire water. For this reason, the fire extinguishing water hits the impeller 6a to rotate the drive unit 6, and the rotation of the drive unit 6 is transmitted to the nozzle unit 8 which slides downward after being decelerated by the reduction unit 7, and rotates the nozzle unit 8.

The rotation of the nozzle 8 causes the nozzle 8 to rotate.
The spraying pattern caused by the discharge of the fire extinguishing water from the slit hole 10 is scanned within a predetermined protection range to spray water throughout the predetermined protection range.

According to such a flash type sprinkler head, a spray pattern is formed so as to spray water intensively on a portion within the protection range, and the inside of the protection range is scanned. Since a larger amount of fire extinguishing liquid is radiated than in the past, a conventional sprinkler head that radiates the entire protection range of 80 liters / minute and a sprinkler head, for example, 40 liters / min.
Compared to the case of about 1 rpm in the rotation scan of liter / minute, a higher fire extinguishing ability can be obtained in spite of a small amount of water in the whole protection range.

[0012]

However, in a flash type sprinkler head for rotating such a nozzle portion, as shown in FIG. It requires a heat-sensitive holding ball 101 for holding, and a rotating ball 100 for rotatably supporting the nozzle portion 8 that has descended in the event of a fire as shown in FIG.

Since the heat-sensitive holding ball and the rotating ball are separately required as described above, the number of parts is increased, and two ball seats for mounting the balls are required, and the height of the entire head is increased. Had the problem of becoming larger.

The present invention has been made in view of the above problems, and provides a flash type sprinkler head capable of reducing the number of parts, miniaturizing the head and facilitating assembly to reduce the cost. The purpose is to:

[0015]

In order to achieve this object, the present invention is configured as follows. A flash sprinkler head according to the present invention includes a head body, a nozzle unit, a driving unit, and a thermal decomposition unit. The head is connected to a fire extinguishing pipe through which fire extinguishing water is pumped. The nozzle part is
The head is pivotally mounted on a head body that forms a spray pattern that intensively sprays water on a specific portion within a predetermined protection range.

The driving section rotates the nozzle section by using a water flow when water for fire extinguishing is sprayed from the nozzle section as a driving source. The thermosensitive decomposition unit holds the nozzle unit at the position where the inflow path is closed in the regular monitoring state, and releases the nozzle unit when it reaches a predetermined temperature due to a fire and decomposes and decomposes, exposing the tip of the nozzle unit And open the inflow channel to flush fire extinguishing water.

In the flash sprinkler head having the above-mentioned structure, the present invention provides a first taper angle with respect to the outer peripheral direction of the head main body orthogonal to the head moving direction on the outer peripheral side of the opening of the thermal decomposition section supporting the nozzle tip. An annular first tapered surface having β is formed, and an inner edge of an opening end exposing a nozzle tip of the head main body is formed on an inner edge of an opening end portion with respect to a head main body outer peripheral direction orthogonal to the head moving direction relative to the first tapered surface. An annular second tapered surface having a 2 taper angle γ is formed, and balls are arranged at a plurality of positions between the first tapered surface and the second tapered surface. When the thermal decomposition part is thermally decomposed by a fire, the nozzle part is moved by pressing on the first tapered surface toward the outer peripheral direction of the head main body by the pressing by the first tapered surface, and the lowered nozzle part is automatically rotated. It is characterized by support in the present.

Therefore, it is possible to use a single ball for the heat-sensitive holding ball for holding the nozzle portion by the heat-sensitive decomposition portion with respect to the head main body and the rotating ball for rotatably supporting the nozzle portion moved in the event of a fire. As a result, the number of parts is reduced, processing and assembly are facilitated, and as a result, costs can be reduced.

Here, when the support of the nozzle portion is released by the thermal decomposition of the thermosensitive decomposition portion, the ball moves on the second tapered surface in the opposite direction to the movement of the first tapered surface to hold the tip of the nozzle. The first taper angle β and the second taper angle γ are set so as to cancel.

That is, when the moving ratio M defined as the moving amount Δh of the ball in the reverse direction when the moving amount of the first tapered surface is 1, M = cos β sin γ / sin (β−γ) The first taper angle β and the second taper angle γ are set so that the ratio M is 1 or more.

The drive section has a speed reduction mechanism that inputs the rotation of the drive shaft, decelerates according to a predetermined reduction ratio, and rotates the nozzle section. In addition, a confirmation hole for confirming the rotation of the nozzle portion is formed in the portion where the ball is arranged, so that the rotation of the head portion in the water discharge state can be confirmed, and the arrangement position of the ball in the steady monitoring state. With this, it is possible to confirm whether the head and the like are set at the correct position.

[0022]

FIG. 1 is a sectional view of an embodiment of a flash sprinkler head according to the present invention.

In FIG. 1, a flash type sprinkler head 1 according to the present invention has a connection screw portion 3 connected to a water supply pipe for pressurizing fire-extinguishing water (or fire-extinguishing liquid) at an upper portion of a head main body 2 and a lower portion at a lower portion. The thermosensitive decomposition part 4 which separates at a predetermined temperature due to a fire is projected. The head body 2 is formed of a cylindrical member in which cases 2a, 2b, 2c and a body cap 2d are sequentially screwed and fixed from above.

An inflow passage 5 through which pressurized fire-extinguishing water flows is formed in the connection screw portion 3 at the upper portion of the head main body 2, and the shaft 12 is provided at a valve seat 11 a in the middle of the inflow passage 5. The valve body 11 integrally formed at the tip is arranged in a steady monitoring state, and the inflow path 5 is closed. A strainer 14 is disposed in the secondary inflow passage 5b divided by closing the inflow passage 5 by the valve element 11, and removes dust in the fire extinguishing liquid or fire extinguishing water. Prevent garbage from clogging.

A drive section 6 is provided following the inflow path 5 closed by the valve element 11. The drive unit 6 integrally forms a plurality of impellers 6 a in a casing 6 b rotatably supported outside a bearing 17 mounted on a housing 16 integrally formed in a case 2 b and opens the valve body 11. As a result, the impeller 6a receives the water flow flowing from the inflow passage 5, and the casing 6b can be driven to rotate.

A speed reduction unit 7 is provided inside the drive unit 6. In this embodiment, a double planetary gear mechanism is provided as the speed reducer 7. That is, the valve body 11 is screwed and fixed to the housing 16 of the case 2b.
The sun gear 18a is fixed to the housing 15 through which the shaft 12 passes, and the planetary gear 19 meshes with the outside of the sun gear 18a, and the internal gear 21 fixed to the casing 6b of the drive unit 6 meshes with the planetary gear 19. The planetary gear 19 is rotatably mounted on the carrier case 20 by a screw shaft.

Subsequently, the sun gear 1 is provided outside the housing 15.
8a, the sun gear 18b is fixed, and the sun gear 18b is fixed.
A planetary gear 22 meshes with b, and an internal gear 23 fixed to the carrier case 20 meshes with the planetary gear 22.

The planetary gear 22 is connected to the carrier case 24 by a screw shaft, and the carrier case 24 serves as an output section for extracting the reduced output rotation of the double planetary gear mechanism. The lower end of the carrier case 24, which serves as the output part of the reduced rotation, extends below the head main body 2 as shown by a broken line, and integrally forms a fixed guide 25.

FIG. 2 shows the double planetary gear mechanism provided in the speed reducer 7 of FIG. In this double planetary gear mechanism, a sun gear 18a is fixed, and the rotation of the drive unit 6 is input by an internal gear 21 via a planetary gear 19 meshed with the sun gear 18a. The planetary gear 19 is rotatably mounted on the carrier case 20, and the carrier case 20 transmits the rotation to the second-stage internal gear 23.

A planetary gear 22 is provided inside the internal gear 23, and meshes with a fixed sun gear 18b like the sun gear 18a. The planetary gear 22 is rotatably mounted on the carrier case 24, and the carrier case 24 takes out an output rotation obtained by reducing the input rotation of the drive unit 6 to the outside.

Referring again to FIG. 1, the lower end of the shaft 12 having the valve element 11 at the top is taken out downward through the housing 15 on which the speed reduction unit 7 is mounted, and is set at the tip by a set screw 35. With the retainer 34 attached, the carrier case 24
A spring 30 is incorporated between the stopper member 29 and the side stopper member 29. The spring 30 is compressed in the illustrated state and urges the retainer 34 side downward with respect to the stopper member 29.

A nozzle unit 8 is provided following the deceleration unit 7 provided inside the drive unit 6. The nozzle portion 8 is a cylindrical body whose tip is narrowed down into a trapezoidal cone, and in this embodiment, the first member 8A, the second member 8B, and the third member 8C
Has a split structure that combines

The first member 8A having a flange portion formed on the upper side of the nozzle portion 8 has a groove formed on the outer peripheral surface of the first member 8A in which a tetrafluoroethylene resin sheet 32 (hereinafter referred to as "sheet 32") is mounted. A nozzle ring 36 is mounted opposite to the mounting surface of the sheet 32, and the lower end thereof is
a.

When the thermal decomposition section 4 drops off due to thermal decomposition and the nozzle section 8 descends, the sheet 32 comes into contact with the sheet crimping step section 33 on the upper inner edge of the lower body cap 2d and contacts the periphery of the nozzle section 8. Prevents water flow from leaking down from the space.

Following the sheet pressing step 33, the ball 50
Are incorporated in, for example, three places in the circumferential direction. The ball 50 functions as a heat-sensitive holding ball that holds the head unit 8 at the lower inner edge of the head main body 2 via the heat-sensitive decomposition unit 4 in the steady monitoring state. When the head 8 is lowered due to thermal decomposition of the pyrolysis unit 4 due to a fire, the stopper surface 36a located at the lower end of the nozzle ring 36 comes into contact with the ball 50, and the head 8 is rotatable. It functions as a ball for rotation to be supported.

The nozzle portion 8 is provided with a fixed guide portion 2 extending from the carrier case 24 to which the reduced speed rotation of the speed reduction portion 7 is output.
5 is provided with a guide portion penetrating in the axial direction as indicated by a broken line, and when the heat-sensitive operation mechanism 4 falls off, the head 30 moves down along the fixed guide 25 by the pressure of the spring 30 and its own weight.
The nozzle portion 8 protrudes outside from the lower end of the body cap 2d at the lower part of the nozzle.

The nozzle portion 8 having a structure in which the first member 8A, the second member 8B, and the third member 8C are combined has a plurality of slit holes 10 formed on the combined surface of the members along the axial direction. With this slit hole 10, water is intensively sprayed to a specific portion within the protection range. The thermosensitive decomposition section 4 holds the balancer 40 in a tray state disposed at the tip of the nozzle section 8 with a ball 5
0 to support the inner edge of the body cap 2d,
The ball 50 is locked by being fitted into a ball storage portion opened around the slider 42.

A screw portion 42 is provided at the lower center of the slider 42.
a mounting flange 48 with a nut is screwed into the screw portion 42a, and the body plate 41 and the heat insulating material 4 are formed.
3. The heat collecting plate 44 and the fuse 47 are supported. Further, two heat collecting plates 45 and 46 are mounted on the upper part of the heat collecting plate 44.

In the thermal decomposition section 4, the fuse 47 is melted when heated to a predetermined temperature due to heat from a fire,
The ball 50 separates from the slider 42 due to the assembling load, the slider 42 and the body plate 41 drop off, and the balancer 40 also drops along with this, and the nozzle portion 8
Is released to project downward.

FIG. 3 is a cross-sectional view of the fire extinguishing water discharge operation state in which the thermal decomposition section 4 of FIG. 1 has separated at a predetermined temperature due to a fire and the nozzle section 8 has protruded.

When the pyrolysis portion 4 of FIG. 1 drops due to pyrolysis due to a rise to a predetermined temperature due to a fire, the nozzle portion 8 is moved to the lower portion of the head main body 2 as shown in FIG. At the same time, the shaft 12 descends, and the valve body 11 separates from the valve seat 11a to open the inflow passage 5 that has been closed. For this reason, the pressurized fire extinguishing liquid or fire extinguishing water from a water supply pipe (not shown) connected to the connection screw portion 3 flows through the inflow path 5 to the periphery of the driving section 6 as shown by the arrow, and the impeller 6a is turned off. When the water flow passes, a rotational force is generated to rotate the housing 6b.

The rotation of the drive section 6 is reduced by the reduction section 7 provided inside, and the reduced rotation is transmitted to the fixed guide section 25 extending from the carrier case 24. At this time, the nozzle portion 8 is at a position shown in the drawing, which has descended downward along the fixed guide 25, and receives the decelerated rotation of the carrier case 24 of the reduction portion 7 through the fixed guide 25, for example, when the water amount becomes 40
If it is liter / minute, it is rotated at a reduced speed of about 1 rpm.

The water flow that has passed through the driving section 6 flows into the nozzle section 8 from the fixed guide 25, and is sprayed to the outside from the slit hole 10 that is opened outward from the center by forming a linear groove.

FIG. 4 is an enlarged view of the structure for holding the nozzle 8 by the thermal decomposition unit 4 via the ball 50.
The balancer 40 disposed at the tip of the nozzle portion 8 has a first tapered surface 60 that comes into contact with the ball 50 on the outer peripheral surface that opens upward. A direction (horizontal direction) orthogonal to the moving direction (vertical direction) of the nozzle section 8 of the first tapered surface 60
A predetermined first taper angle β is set on the side opposite to the nozzle moving direction, and a force is applied to the ball 50 in the outer peripheral direction and downward by the first tapered surface 60.

A ball 5 is provided on the inner surface hedge portion of the body cap 2 d facing the first tapered surface 60 of the balancer 40.
A second tapered surface 62 with which 0 abuts is formed. This second
The tapered surface 62 has a second taper angle with respect to the horizontal direction.
The taper angle γ is set.

The ball 50 disposed between the first tapered surface 60 of the balancer 40 and the second tapered surface 62 on the side of the body cap 2d is fitted into a ball storage hole 42b formed on the side surface of the slider 42 installed from below. Have been. The fitting of the slider 42 to the ball 50 and the second tapered surface 62 opposed to the first tapered surface 60 hold the position of the ball 50 pressed by the first tapered surface 60 in the outer peripheral direction of the head main body 2. Further, the slider 42 is held on the body cap 2d side.

A screw portion 42a protruding from the lower center of the slider 42 has a body plate 41, a heat insulating material 4 therebetween.
3. The heat collecting panel 44 and the fuse 47 are incorporated to form the thermal decomposition section 4. Subsequent to the second tapered surface 62 in the body cap 2d in which the ball 50 is incorporated, a flat ball seat 52 for receiving the movement of the ball 50 when the thermal decomposition section 4 is disassembled is formed.
A ball gauge ring 37 is provided to provide guidance when 0 moves as indicated by a broken line.

FIG. 5 is a plan view of the ball gauge ring 37 shown in FIG. A guide groove 58 is formed from the inner periphery to the outer periphery of the ball gauge ring 37 at the position where the ball 50 is assembled, and guides the ball 50 that has left the heat-sensitive holding state in FIG. are doing.

Referring again to FIG. 4, a confirmation hole 56 is formed in the outer wall portion of the body cap 2d corresponding to the position where the ball 50 is incorporated, so that the position of the ball 50 can be confirmed from the outside. That is, if the ball 50 is located at the position shown in the drawing when viewed from the confirmation hole 56, the thermo-sensitive holding state is established, and the ball 50 is removed as shown by a broken line due to the thermal decomposition of the thermo-sensitive decomposition part 4 due to thermal decomposition.
Is moving outward, it is understood that the head unit 8 is in a rotating state.

FIG. 6 shows the first tapered surface 60 on the nozzle portion 8 side where the ball 50 of FIG.
The method of determining the first taper angle β of the first taper surface 60 and the second taper angle γ of the second taper surface 62 will be described.

In FIG. 6, the second tapered surface 6 for the body
2 is fixed, whereas the first tapered surface 60 on the balancer 40 side supporting the head portion 8 is
When the ball 50 is held at the position where the ball 50 is held in the heat-sensitive holding state in the steady monitoring state, the ball 50 is moved in a direction opposite to the moving direction of the nozzle unit 8 when the heat-sensitive decomposition unit 4 thermally decomposes,
Like the ball 50a, the ball is moved from the second tapered surface 62 to the first tapered surface 60a immediately before the ball is moved to the flat ball seat 52.

As described above, the first tapered surface 6 at the time of maintaining the heat sensitivity is provided.
When the ball 50 moves to 50a, the moving amount Δh in the opposite upward direction when the ball 50 moves to 50a is 0, and the moving amount Δh in the reverse direction when the ball 50 moves to 50a when the ball 50 is moved by thermal decomposition. Will have.

Here, the movement amount of the balancer 40 is defined as the nozzle descent amount a, and the ball 5 associated with the movement of the nozzle descent amount a
The movement amount of 0 is defined as the ball rising amount Δh, and the nozzle descending amount a =
The ratio of the ball lift Δh when it is set to 1 is defined as a moving ratio M.

The moving ratio M is obtained from the geometric relationship shown in FIG.

Moving ratio M = (ball rising amount Δh) / (nozzle lowering amount a) = cos β sin γ / sin (β−γ) (1) FIG. 7 is a diagram for calculating the moving ratio M of the equation (1). Are extracted from the triangle OPQ. In FIG.
First, assuming that the length OQ = K, there is a relationship of cosβ = d / K (2) between PQ and the diameter d of the ball 50. Therefore, the length K is K = d / cosβ (3). Here, looking at the relationship between the triangle OPQ and the triangle O′P′Q, when the length PP ′ = c, the following relationship is obtained.

(D / cosβ): d = (d / cosβ-a): (dc) a = c / cosβ c = a cosβ (4) Also, the triangle PRS and the triangle PT having the ball rising amount Δh
In Q, when the angle formed by each RPQ is θ, the triangle PRP ′ has the following relationship.

Cos θ = c / L L = c / coc θ (5) Here, since the angle θ formed by each RPP ′ is θ = 90 ° −β + γ (6), cos θ is cos θ = cos (90 ° − β + γ) = − sin (−β + γ) = sin (β−γ) (7) For this reason, in the triangle PRS, the relationship of sinγ = Δh / L (8) is obtained. From this equation (8), the ball lift amount Δh
Is obtained as follows: Δh = sinγ · L = sinγ · c / cosθ = a · cosβ sinγ / sin (β−γ) By substituting the value of the ball rise amount Δh into the equation (1), the moving ratio M can be obtained.

In the present invention, it is necessary to allow the ball 50 to move quickly and release the holding as shown by the broken line in FIG. Therefore, in the present invention, the first taper angle β and the second taper angle γ are set so that the moving ratio M in the equation (1) is larger than 1.

FIG. 8 shows that the movement ratio M according to the equation (1) when the first taper angle β is increased from 45 ° in units of 1 ° and the second taper angle γ is increased in units of 1 ° from 45 °. This is a calculation result, and the area on the upper right side of the bold line has a movement ratio M exceeding 1. For example, when β = 50 ° and γ = 45 °, the movement ratio M = 5.22, and a movement that is five times or more as the ball lifting amount Δh can be obtained with respect to the movement of the nozzle lowering amount a = 1.

When β = 50 ° and γ = 40 °, the moving ratio M becomes 2.38.
= 2.38 times as high as 1.

In this case, the relationship between the first taper angle β and the second taper angle γ for obtaining the moving ratio M of 1 or more may be in the upper right region of FIG. 8, but is practically 45 °. ≦ β ≦ 65 ° 30 ° ≦ γ ≦ 45 °

On the other hand, assuming that a nozzle pressing load applied downward from the nozzle portion 8 in FIG. 4 is F1, and a thermosensitive decomposition supporting load received by the body cap 2d through the balancer 40 and the ball 50 is F2, the equation (1) is given. The following relationship is obtained between the two by the transfer ratio.

The thermal decomposition supporting load F2 = nozzle pressing load F1 / movement ratio M (9) Since the moving ratio M is 1 or more from the relationship between the nozzle pressing load F1 and the thermosensitive decomposition supporting load F2, the body cap 2d On the side, the nozzle pressing load F1 can be applied with the moving ratio reduced to 1 / M. For this reason, the nozzle section 8
Even if the pressing load F1 on the side is large, the thermal decomposition supporting load F2 applied to the body cap 2d side can be reduced by the moving ratio M, and the supporting structure on the body cap 2d side can be reduced in weight and size.

Further, in the assembled state shown in FIG. 4, the mounting flange 48 is attached to the screw portion 4a at the lower center of the slider 42.
By tightening the nuts, an assembling load occurs in which the slider 42 presses the ball 50 against the second tapered surface 62 with the body plate 41 as the fixed side. This assembling load is also converted into a vertical component corresponding to the taper angle γ of the second tapered surface 62 as the second tapered surface 6 of the body cap 2d.
2 is applied to the inner edge overhang, and the load can be reduced by that amount to simplify the support structure.

FIG. 9 shows another embodiment of the flash type sprinkler head according to the present invention. In the embodiment of FIG. 1, the drive unit 6 is provided with the reduction unit 7 using a planetary gear mechanism. This embodiment is characterized in that the structure is simplified without providing a speed reduction unit.

In FIG. 9, the flush type sprinkler head 1A has a connection screw portion 3 provided with an inflow passage 5 at an upper portion of the head body 2, and a valve seat 1 provided following the inflow passage 5.
The valve body 11 formed integrally with the drive shaft 12 is housed in 1a to close the inflow passage 5. The head portion 8 is fixed to the lower end of the drive shaft 12 with screws with a spring 64 interposed therebetween. The head portion 8 has its tip side converged on a cone, and has a slit 10a opened in the conical surface.

A body cap 2d is attached to a lower portion of the head main body 2a, a thermosensitive decomposition section 4 is attached to a lower opening of the body cap 2d, and the head 8 is held in a closed state of the inflow path 5 via a ball 50. are doing. The ball 50 has a first tapered surface 60 formed on the outer peripheral surface of the balancer 40 disposed on the tip end side of the head portion 8 and a second tapered surface 62 formed following a flat ball seat at the lower inner edge of the body cap 2d. And is held by fitting an opening hole on the outer peripheral surface of the slide 42 located above the thermal decomposition part 4, and assembled by pressing the lower end of the body cap 2d of the body plate 41 by screwing the mounting flange 42. ing.

First tapered surface 6 on which ball 50 is arranged
The structure of the zero and second tapered surfaces 62 is the same as that of the first embodiment enlarged and taken out in FIG. 4, and the nozzle descent amount a according to the equation (1) is determined by the geometric relationship in FIG. The first taper angle β and the second taper angle γ are set according to FIG. 8 so as to obtain a moving ratio M that makes the ball moving amount Δh equal to or greater than 1 when the value is 1.

FIG. 10 shows a state in which the flash sprinkler head 1A shown in FIG. 9 is operated by receiving heat from a fire. That is, in FIG. 9, when the fuse 47 of the thermal decomposition section 4 is melted, the slider 4 with respect to the body cap 2d side is moved.
2 and the body plate 41 are released, and the ball 50 separates outward as indicated by the broken line in FIG. 4 by receiving the load of the spring 64 and the pressure of the fire-extinguishing water flowing from the inflow passage 5, and the thermosensitive decomposition unit 4 drops off.

For this reason, the heat-sensitive holding of the head portion 8 is released and the head portion 8 descends as shown in FIG. 10, and the lower end of the upper rotating flange 66 of the head portion 8 comes into contact with the ball 50 detached outward and is supported rotatably. Is done. At this time, the fire extinguishing water flowing from the inflow passage 5 transmits a rotational force to the drive shaft 12 when passing through the impeller 6a mounted on the tip of the drive shaft 12, whereby the head portion 8 supported by the ball 50 rotates, Water for fire extinguishing is sprayed from 10a, and the spraying pattern is scanned within a predetermined protection range to spray water over the entire protection range.

Further, in the embodiment shown in FIG.
0 on the side of the body cap 2d
6 is opened, and when the head unit 8 descends and rotates as shown in FIG. 10, the rotation of the head unit 8 can be confirmed by the ball 50 being visible from the confirmation hole 56.

The present invention is not limited to the above-described embodiment, but includes appropriate modifications without impairing the objects and advantages thereof.

[0073]

As described above, according to the present invention, a heat-sensitive holding ball for holding a nozzle portion rotatable with respect to the head body by a thermosensitive decomposition portion, and a nozzle portion moved in the event of a fire can be rotated freely. The supporting ball can be shared by one ball, the number of parts is reduced, and only one ball seat for incorporating the ball is required.
The structure is simple, the assembling process is easy, the size of the entire head can be reduced, and as a result, a sufficient cost reduction can be achieved.

Further, the balls are arranged between the taper surface on the head side and the taper surface on the body side, and the taper angle of each taper surface is such that the amount of ball rise in the direction opposite to the descending amount on the head side is 1 or more. By optimally setting the taper angle of each taper surface, the ball is released from the holding state with a large amount of movement against a slight descent on the head side due to the thermal decomposition of the thermal decomposition part, and the head part is held quickly and reliably. By releasing and lowering, water can be sprayed by rotating the head.

In particular, even if the ball is in the fixed state due to the heat-sensitive holding state for a long period of time, the ball is slid by the operation of the thermal decomposition section and moves to the rotating position. There is no problem that waste occurs, and even in the case of a long-term installation, in the event of a fire, the head portion can be reliably protruded and swiveled to drive, and the reliability is high.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a flash sprinkler head according to the present invention.

FIG. 2 is an explanatory view of a double planetary gear mechanism used in the reduction unit of FIG. 1;

FIG. 3 is a cross-sectional view of the thermal operation state of FIG. 1;

FIG. 4 is an explanatory view in which the ball-incorporated portion of FIG. 1 is enlarged.

FIG. 5 is a plan view of the ball gauge ring of FIG. 4;

FIG. 6 is an explanatory diagram of a geometric structure of a ball-incorporated portion in FIG. 4;

FIG. 7 is an explanatory view showing the triangle OPQ in FIG. 6;

FIG. 8 is an explanatory diagram of a calculated value of a ball moving ratio M in the present invention with respect to the taper angles β and γ.

FIG. 9 is a cross-sectional view of another embodiment of the flash sprinkler head according to the present invention without a deceleration section.

FIG. 10 is a cross-sectional view of the thermal operation state of FIG. 9;

FIG. 11 is a cross-sectional view of a flash type sprinkler head provided with a heat-sensitive retaining ball and a rotating ball.

FIG. 12 is a sectional view of the heat-sensitive operation state of FIG. 11;

[Explanation of symbols]

 1, 1A: flash type sprinkler head 2: head main body 2d: body cap 4: thermosensitive decomposition section 5: inflow path 6: drive section 7: reduction section 8: head section 10, 10a: slit hole 11: valve body 12: drive Shaft 37: ball gauge ring 40: balancer 41: pod plate 42: slider 42a: screw portion 42b: ball storage hole 43: heat insulating material 44: heat collecting plate 45, 46: heat collecting plate 47: fuse 48: mounting flange 50: Ball 52: Ball seat 56: Confirmation hole 58: Guide groove 60: First taper surface 62: Second taper surface 64: Spring β: First taper angle γ: Second taper angle

Continuation of the front page (72) Inventor Tamotsu Shimokawa 2-10-43 Kami-Osaki, Shinagawa-ku, Tokyo Ho Chiki Co., Ltd. F-term (reference) 2E189 CC01 CD01 CF01 KA08 4F033 PA18 PB02 PB09 PB12 PB16 PB33

Claims (5)

[Claims] 1. A head body connected to a fire-extinguishing pipe through which fire-extinguishing water is pumped, and a nozzle swivelable with respect to the head body forming a spray pattern for spraying water intensively on a specific portion within a predetermined protection range. A driving unit that rotates the nozzle unit by using a water flow when sprinkling the fire extinguishing water from the nozzle unit as a driving source, and holding the nozzle unit at a position that closes the inflow path in a steady monitoring state, causing a fire. When it reaches a predetermined temperature and is thermally decomposed,
A flash-type sprinkler head comprising: a heat-sensitive decomposition unit that releases the holding of the nozzle portion, lowers the nozzle portion to expose the tip of the nozzle portion, and opens the inflow passage to flow fire-extinguishing water. An annular first tapered surface formed at an outer periphery of an opening side of the thermosensitive decomposition section to be supported and having a first taper angle β with respect to a head body outer peripheral direction orthogonal to a head moving direction; and a nozzle tip of the head body is exposed. An annular second tapered surface formed on an inner edge of the opening end to be opposed to the first tapered surface and having a second taper angle γ with respect to a head body outer peripheral direction orthogonal to a head moving direction; It is disposed at a plurality of locations between the tapered surface and the second tapered surface, and in a steady monitoring state, the head portion is fixedly supported on the head body via a thermal decomposition portion, and the thermal decomposition portion is thermally separated by a fire. A ball that moves on the second tapered surface in the outer peripheral direction of the head body under the pressure of the first tapered surface and rotatably supports the lowered nozzle portion. Flash type sprinkler head. 2. The flash-type sprinkler head according to claim 1, wherein the ball is moved by the first tapered surface when the support of the nozzle portion is released by thermal decomposition of the thermosensitive decomposition portion. A flash sprinkler head, wherein the first taper angle β and the second taper angle γ are set such that the second tapered surface is moved in the opposite direction to release the nozzle tip from being held. 3. The flash type sprinkler head according to claim 2, wherein a moving ratio M defined as a moving amount Δh of the ball in the opposite direction when the moving amount of the first tapered surface is set to 1 is M. Wherein the first taper angle β and the second taper angle γ are set so that the moving ratio M is 1 or more, where: cos β sin γ / sin (β−γ). 4. A flash type sprinkler head according to claim 1, wherein said drive unit has a speed reduction mechanism for inputting rotation of a drive shaft and reducing the speed according to a predetermined reduction ratio to rotate said nozzle portion. Flash type sprinkler head characterized by the following. 5. A flash sprinkler head according to claim 1, wherein said head main body has a confirmation hole for confirming rotation of said nozzle portion at a portion where said ball is arranged. Sprinkler head.