JP4612708B2 - Sprinkler head - Google Patents

Description

  The present invention relates to a sprinkler head. More specifically, the sprinkler head is incorporated in a sprinkler head, presses a valve body by an assembly load to close a water discharge port, disassembles it at the time of a fire and opens the water discharge port to spray fire-extinguishing water. This relates to the structure of the link mechanism in FIG.

  As a publication describing the configuration of this type of link mechanism, there is, for example, Japanese Utility Model Publication No. 5-51368. The structure of the conventional link mechanism mentioned in this publication is shown in FIG. In FIG. 5A, a part of the name common to the present application will be described. 101 is a pair of levers having a bent portion 111, 102 is a presser plate, 103 is a support plate, 104 is a cylinder, 105 is a low-melting alloy, and 106 is a piston. The holding plate 102 and the support plate 103 are slightly bent at both ends and passed through the holes 112 and 113 of the lever 101 and hooked. A screw 114 is screwed into the presser plate 102, and a cylinder 104 filled with a low melting alloy 105 is inserted into a hole of the support plate 103.

The assembled state of the link mechanism shown in FIG. 5A is shown in FIG. However, FIG. 5B shows a case where the upper and lower holes 112 and 113 of the lever 101 communicate with each other. In FIG. 5B, 120 is a sprinkler head body provided with a water outlet 121, and 122 is a valve body. As shown in the figure, a fixed assembly load is applied to the incorporated link mechanism, the left and right levers 101 are bent, the valve body 122 is pushed up, and the water outlet 121 of the main body 120 is closed. When a fire occurs, the low-melting alloy 105 is melted by heat, the lever 101 and the support plate 103 are released from the assembly load, the link mechanism is disassembled, and water is sprayed from the water outlet 121 of the sprinkler head. ing.
Japanese Utility Model Publication No. 5-51368.

  As described above, in the conventional link mechanism, the disassembly operation is performed by the force to rotate in the outward direction of the pair of levers 101 accompanying the assembly load. Therefore, it is considered that a stable disassembly operability of the sprinkler head can be realized simply by increasing the assembly load applied to the link mechanism. However, this type of assembly load is normally set to a relatively high value of about 100 kgf. Accordingly, there is a problem that if the load is further increased and set to more than that, each component of the link mechanism may be disassembled beyond the elastic limit.

  The present invention has been made to solve the above-described problems. When an external force is applied to the heat-sensitive plate by tools or the like, the vicinity of the constricted portion of the screw portion is broken and the “bottom-out of the cylinder” “The main purpose is to eliminate malfunctions and to prevent accidental water discharge. It is another object of the present invention to ensure that the heat sensitive plate is in close contact with the cylinder and is thermally coupled.

  The present invention includes a pair of arms that are arranged facing each other back to back with the bent portions on the outside, and are provided with rotational torque in a direction that widens the interval with the tip of the bent portion as a fulcrum by assembly load, and the lower side of the arm is folded at both ends. In a sprinkler head in which a support plate formed by mounting a cylinder containing a melting member that is attached to a curved portion and pressed against a piston is incorporated in a link mechanism, a heat sensitive plate is screwed into a lower portion of the cylinder. A sprinkler head having a link mechanism in which a constricted portion is provided at a base portion of a screw portion to be connected together. In addition, the sprinkler head is provided with a link mechanism in which a slit is provided at the tip of the screw portion and a female screw of a heat sensitive plate screwed into the screw portion is passed through.

  The present invention includes a pair of arms that are opposed to each other back-to-back with the bent portions on the outside, and are provided with rotational torque in a direction that widens the interval with the tip of the bent portion as a fulcrum by assembly load, and the lower side of the arm is folded at both ends. In a sprinkler head in which a support plate formed by mounting a cylinder containing a melting member that is attached to a curved portion and pressed against a piston is incorporated in a link mechanism, a heat sensitive plate is screwed into a lower portion of the cylinder. Since the sprinkler head is provided with a link mechanism with a constricted part at the base of the screw part to be connected, the constricted part of the screw part is used when external force is applied to the heat sensitive plate by tools etc. It is possible to eliminate the “bottom-out” failure of the cylinder by breaking the vicinity of the cylinder, and it is possible to eliminate the occasional water discharge.

  In addition, since the sprinkler head is provided with a link mechanism in which a slit is provided at the tip of the screw portion and the female screw of the heat sensitive plate screwed into the screw portion is passed through, the screw cylinder of the heat sensitive plate is made into a cylinder. When screwed into the threaded portion, the screwdriver inserted through the threaded hole can be engaged with the slot at the tip and screwed into the threaded portion. With this screwing operation, the heat sensitive plate is securely brought into close contact with the cylinder and thermally coupled, so that it is possible to prevent the thermal response from being lowered due to loosening or uncertain tightening.

  1 is a longitudinal sectional view of a sprinkler head according to the present invention, FIG. 2 is an explanatory diagram of the structure of a frame, (a) is a front view of the frame, (b) is a bottom view of the frame, and FIG. 3 is a partially enlarged view of FIG. FIG. 4 is an exploded perspective view of the link mechanism. The configuration of the embodiment of the present invention is similar to the conventional example, but will be described in detail. 1 to 4, 1 is a sprinkler head, 2 is a main body having a taper screw formed on the outer periphery, 3 is a hexagonal flange plate, and 4 is a male screw below the flange plate 3. A water outlet 5 is formed at the axis of the main body 2 and is connected to the ceiling pipe by a taper screw. A valve seat 7 is provided at the lower peripheral edge of the water outlet 5, and the water outlet 5 is sealed off by the valve body 20 by contacting a packing 22 made of a soft metal material to the valve seat 7.

  Reference numeral 10 denotes a bottomed cylindrical frame (shown by itself in FIG. 2), and a female screw 11 that is screwed into the male screw 4 of the main body 1 is provided on the upper portion of the inner wall. A flange portion 12 is formed on the inner peripheral surface. A plurality of water spray holes 15 are formed radially between the flange portion 12 and the bottom portion 14, and open at equal intervals at the corners where the peripheral edge portion of the bottom portion 14 and the peripheral wall 13 are joined. Reference numeral 16 denotes an oval opening formed on the bottom surface of the frame 10. Reference numeral 30 denotes an arm guide having a substantially U-shaped cross section, which is integrally joined by caulking an annular protrusion on the lower surface of the valve body 20. Reference numeral 35 denotes a substantially plate-like balancer for supporting the valve body 20 for equalizing the assembly load L applied to the arm 41 of the link mechanism described below.

  Reference numeral 40 denotes a link mechanism assembled in a substantially girder type. An enlarged view and an exploded perspective view of the vicinity of the link mechanism 40 are shown in FIGS. Reference numeral 41 (generic name) denotes an arm constituting the main part of the link mechanism 40, and reference numeral 46 denotes a support plate. The arm 41 is formed in an inverted J shape by providing a folded portion 42 of a 180-degree folding type at the top. Further, an arc groove 43a is formed in the width direction of the lower end of the plate-like portion 43, and rectangular locking holes 44 and 45 are provided in the middle. A pair of arms 41a and 41b are arranged facing each other back-to-back with the bent portions 42 and 42 facing outside. The support plate 46 includes an oval main body 47 having a through-hole 48 in the center, and locking pieces 49a and 49b that protrude from the main body 47 to the left and right and have their tips bent slightly downward.

  As shown in the figure, the width W of the locking pieces 49a and 49b on both sides of the main body 47 is formed in a bee shape (repellent shape) that widens toward the tip. In the assembled state of the link mechanism 40, the main body 47 is disposed between the arms 41a and 41b, the locking pieces 49a and 49b are inserted into the locking holes 44 and 44 on the lower side, and the bent portion at the tip is outside. It is pinched from. As a result, the locking pieces 49a, 49b and the locking holes 44, 44 are brought into surface contact with the progress of opening of the arms 41a, 41b when the link mechanism 40 to which an assembly load L described later is applied is disassembled. Since the area where the area is increased, the surface pressure (pressure) gradually decreases.

  Reference numeral 50 denotes a metal cylinder, which is composed of two parts, a cylindrical part 51 having a collar and a screw part 52. 52a is a constricted portion formed at the neck of the screw portion 52, and 52b is a slot formed at the tip. The constricted portion 52a is thinned to concentrate the stress, and a tool such as a screwdriver is inserted into the slit 52b and locked. The cylinder 50 is inserted into the through hole 48 of the support plate 46 and is placed on the support plate 46 by the flange of the cylindrical portion 51. Reference numeral 53 denotes a heat sensitive member accommodated in the cylinder 50. The heat sensitive body 53 is made of a metal such as solder or a non-metallic material such as a synthetic resin that is solidified at room temperature and has a certain hardness or more, and melts when heat is applied at a low temperature.

  A piston 54 presses the heat sensitive body 53 and is slidably accommodated in the cylinder 50. 55 is a presser plate having a shape similar to that of the support plate 46, and includes a square plate-like main body 56 having a screw hole 57 at the center, and fitting pieces 58a and 58b projecting on both sides thereof. The holding plate 55 is also disposed between the arms 41a and 41b, like the support plate 46, and the fitting pieces 58a and 58b are loosely inserted into the locking holes 45 and 45 on the upper side to bridge the left and right arms 41a and 41b. It is entangled. A threaded portion 60 provided at the upper end of the pressing rod 59 is screwed into the screw hole 57 of the presser plate 55, and the tip is in contact with the piston 54 by screwing. Reference numeral 61 denotes a heat sensitive plate that transfers heat to the heat sensitive body 53, and also serves as a protective cover that surrounds and protects the link mechanism 40 and the like. The heat sensitive plate 61 is composed of a cap-shaped protection plate 61a and a screw cylinder 61b which is fixed to the center thereof by caulking or the like and penetrates through a screw hole of a female screw.

  By screwing the screw cylinder 61 b into the screw portion 52 of the cylinder 50, the lower surface of the link mechanism 40 is covered and the heat sensitive plate 61 is integrally connected to the cylinder 50. Reference numeral 63 denotes an elastic body that has an expanding elastic force, and reference numeral 64 denotes an adhesive seal such as a metal foil that closes the screw hole of the screw cylinder 61b. A test seal may be used as the adhesive seal 64. The elastic body 63 has arm pieces 63b and 63b projecting on both sides of the center annular portion 63a. As shown in an enlarged view in FIG. 3, a screw cylinder 61b is inserted into the annular portion 63a of the elastic body 63, and the tips of the arm pieces 63b and 63b are fitted into the arc grooves 43a and 43a at the lower ends of the arms 41a and 41b. ing. When assembled in the link mechanism 40, the elastic body 63 is attached in the form of a bow between the arms 41a and 41b and acts as a leaf spring, so that the rotational torque T described below is (T + ΔT). An elastic force ΔT is applied. A coil spring may be used as the elastic body 63.

  As shown in FIG. 1, in the assembled state of the sprinkler head 1, the end portions on the bent portions 42 and 42 side of the arms 41 a and 41 b of the link mechanism 40 are locked to the flange portion 12 provided on the inner wall of the frame 10. The bent portions 42 and 42 are pressed down by the balancer 35 by screwing the female screw 11 into the male screw 4 of the main body 2. When the sprinkler head 1 is assembled in this way, the arms 41a and 41b are bent by a predetermined assembly load L and the valve seat 7 is sealed via the valve body 20 as in the above-described conventional example. For this reason, the arms 41a and 41b are each given a rotational torque T in a direction in which the interval is increased (a direction away from the cylinder 50) with the locking point of the flange portion 12 as a fulcrum. The rotational torque T is suppressed by the support plate 46 in which the locking holes 44, 44 are secured by the bee-shaped locking pieces 49a, 49b.

  Here, the watering operation of the sprinkler head 1 will be described. When the heat sensitive body 53 is softened through the heat sensitive plate 61 that senses heat due to the occurrence of a fire, the piston 54 crushes the heat sensitive object 53 by the assembly load L and descends. The heat sensitive body 53 that has transitioned to the molten state due to the rise in the fire temperature is pushed out from the gap between the cylinder 50 and the piston 54, and the support plate 46 is pushed up integrally with the cylinder 50, and the locking pieces 49a, 49b and the locking holes 44, 44 is disengaged. The disengagement of the left and right locking pieces 49a, 49b at this time usually involves a time shift. Then, one (or both) of the arms 41a and 41b is rotated in the arrow direction by the rotational torque T based on the assembly load L, and the link mechanism 40 is disassembled.

  In this case, in the embodiment of the present invention, an elastic body 63 is attached to the link mechanism 40, and an elastic force ΔT is added to the rotational torque T of the assembled arms 41a and 41b. For this reason, the rotational torque T is increased to (T + ΔT), and the disassembly of the link mechanism 40 becomes quick and reliable. Further, since the locking pieces 49a and 49b that are fitted into the locking holes 44 and 44 and are in surface contact with each other are formed in a bee shape, the locking hole 44 and the locking pieces 49a and 49b are rotated with the rotation of the arms 41a and 41b. Therefore, the surface pressure per unit area decreases corresponding to the distance through which the arms 41a and 41b come out. Therefore, the locking pieces 49a and 49b can be smoothly pulled out from the locking holes 44 and 44, and the disassembly and the disassembly of the link mechanism 40 can be further accelerated.

  By such disassembly of the link mechanism 40, the link mechanism 40 including the heat sensitive plate 61 and the balancer 35 come out of the frame 10 through the opening 16 provided in the bottom portion 14 and drop. At the same time, the arm guide 30 integrated with the valve body 20 descends along both ends of the opening 16 of the frame 10 due to its own weight and the pressure of the fire extinguishing water. The lowered flange portion of the valve body 20 is seated on the bottom portion 14 of the frame 10 and closes the opening portion 16. The fire extinguishing water pressurized from the water discharge port 5 opened by this closing passes through the frame 10 and spouts from the sprinkling □ 15 around the corner portion, and uniform radial sprinkling toward the floor surface is performed.

  On the other hand, as described above, the heat sensitive plate 61 is connected to the cylinder 50 by screwing the screw cylinder 61 b into the screw portion 52 of the cylinder 50. The thermal plate 61 can be coupled to the cylinder 50 while the screwdriver 61 is screwed into the slot 52b at the tip of the screw portion 52 while the screwdriver 61 is screwed into the screw hole. If such a screwing operation is performed, the rotation of the cylinder 50 can be prevented, so that the heat sensitive plate 61 is securely brought into close contact with the cylinder 50, and both are mechanically and thermally coupled to prevent a decrease in thermal response. . Further, during maintenance / inspection, an external force is applied to the heat-sensitive plate 61 having a large shade and a large radius. In such a case, the portion of the constricted portion 52a where the stress is concentrated breaks, and it becomes possible to prevent the occurrence of emergency water discharge accompanying the bottom drop of the cylinder 50 to which the assembly load L is applied. Further, since the adhesive seal 64 is affixed to the bottom surface of the screw cylinder 61b, the slit 52B is hidden and is not conspicuous.

  In the above-described embodiment, the case where the elastic force ΔT of the elastic body 63 is used to add to the rotational torque T has been described as an example, but it is stored in a high temperature state by heating, such as a TiNi alloy. It is also possible to use the shape memory effect that transforms the shape into martensite. If an elastic body having a structure as shown in FIG. 4 is formed of a shape memory alloy, a predetermined value can be maintained without adding a load during normal times, and ΔT can be generated by automatically returning to the parent phase by the heat of a fire. So it is very convenient. Further, if TiNi or the like is used for the arm or the support plate, there is an advantage that a link mechanism that can be easily dissociated without increasing the number of parts can be configured. Further, although the cross-girder type link mechanism has been described as an example, other constituent members constituting the sprinkler head such as a support plate and a heat sensitive plate are not necessarily limited to the configuration of the embodiment.

  In the present invention, an elastic body is attached to the link mechanism so that an elastic force ΔT is added to the rotational torque T of the assembled arm. For this reason, the rotational torque T is increased to (T + ΔT), and the disassembly of the link mechanism becomes quick and reliable. Further, since the locking piece of the support plate that is fitted into the locking hole of the arm and comes into surface contact is formed in a bee shape, the surface pressure per unit area decreases corresponding to the distance from which the surface pressure is released. For this reason, the locking piece can be smoothly pulled out from the locking hole, and the link mechanism can be disassembled and separated more quickly. Further, when the screw cylinder of the heat sensitive plate is screwed into the threaded portion of the cylinder, the screwdriver inserted through the threaded hole can be engaged with the slot at the tip and screwed into the threaded portion. With this screwing operation, the heat sensitive plate is securely brought into close contact with the cylinder and thermally coupled, so that it is possible to prevent the thermal response from being lowered due to loosening or uncertain tightening. In addition, when external force is applied to the heat sensitive plate with tools, etc., the vicinity of the constricted part of the screw part can be broken to eliminate the “bottom-out” failure of the cylinder and to prevent accidental water discharge. Become.

  Therefore, according to the present invention, the link mechanism is quickly and surely disassembled and separated in the event of a fire, and the link mechanism is provided that can effectively sprinkle water without affecting the flow of the fire-extinguishing water due to the remaining components. A sprinkler head can be provided.

It is a longitudinal cross-sectional view of the sprinkler head of this invention. It is a structure explanatory drawing of a frame. It is the elements on larger scale of FIG. It is a disassembled perspective view of a link mechanism. It is a structure explanatory view of a conventional device.

Explanation of symbols

1 sprinkler head, 2 body, 3 base plate, 4 male screw, 5 water outlet, 7 valve seat, 10 frame, 11 female screw, 12 flange, 13 peripheral wall, 14 bottom, 15 water spout, 16 opening, 20 valve Body, 22 packing, 30 arm guide, 35 balancer, 40 link mechanism, 41 (41a, 41b) arm 42 bent part, 43 plate-like part, 43a arc groove, 44, 45 locking hole, 46 support plate, 47 body, 48 through hole, 49a, 49b locking piece, 50 cylinder, 51 cylindrical part, 52 screw part, 52a constricted part, 52b slit, 53 heat sensitive body, 54 piston, 55 presser plate, 56 body, 57 screw hole, 58a, 58b fitting piece, 59 pressing rod, 60 threaded portion, 61 heat sensitive plate, 61a protective plate, 61b threaded cylinder, 63 elastic body (component), 64 adhesive seal, 63a annular portion, 63b 63b arm piece, L assembly load, T rotational torque, △ T elastic force (additional torque), W width.

Claims (2)

A pair of arms that are opposed to each other back to back with the bent portions on the outside and are given a rotational torque in a direction that widens the interval with the tip of the bent portion as a fulcrum by assembly load, and the lower portions of the arms are bent at both ends In a sprinkler head incorporated in a link mechanism with a support plate on which a cylinder containing a melting member which is attached and pressed by a piston is placed,
A sprinkler head, comprising: a link mechanism provided with a constricted portion at a base portion of a screw portion provided at a lower portion of the cylinder and connected to a heat sensitive plate by screwing.   2. The sprinkler head according to claim 1, further comprising a link mechanism that is provided with a slit at the tip of the screw portion and through which a female screw of the heat sensitive plate screwed into the screw portion is passed.