JP7090954B1 - Heating tester - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating tester which can be used for testing a plurality of types of fire detectors having different morphologies of heat sensitive bodies and can appropriately test each of them. A heating tester according to the present invention is arranged above an electric heater 22 for heating a heat-sensitive fire detector 1 and an electric heater 22, and detects heat generated from the electric heater 22. It is provided with a heat radiating port 62 for discharging toward the vessel 1 and a scaling mechanism 61 for changing the opening size of the radiating port 62 to a large or small size. The expansion / contraction mechanism 61 includes a plurality of diaphragm blades 65 having heat insulating properties. Each diaphragm blade 65 swings around a swing axis 64 orthogonal to the installation surface of the fire detector 1 between a heat shield posture in which the heat radiation port 62 is minimized and an open posture in which the heat radiation port 62 is maximum. It is freely pivotally supported. The minimum heat dissipation port 62 is composed of a small opening 77 surrounded by a plurality of diaphragm blades 65 that take a heat shielding posture. [Selection diagram] Fig. 1

Description

The present invention relates to a heating tester for testing a heat-sensitive fire detector.

A heating tester equipped with a heat source for heating the heat-sensitive fire detector is used for testing a heat-sensitive fire detector installed on an indoor ceiling or the like. As a heat source of such a heating tester, a reaction heat generated when benzine (hydrocarbon fuel) is oxidatively decomposed by the catalytic action of platinum, an electric heater that does not use fuel, and the like are known. In the present invention, the latter electric heater is adopted because it can contribute to the realization of carbon neutrality and is not restricted from bringing in combustibles. However, the heating tester itself using the electric heater as a heat source is used. For example, it is disclosed in Patent Document 1. In the heating tester of Patent Document 1, an electric heater arranged in a spiral shape is housed and held inside a cup-shaped holder having an open upper surface.

Registered Utility Model No. 3042120

Here, the structure of the heat-sensitive fire detector will be described with reference to FIG. There are a plurality of types of fire detectors 1, but in many cases, a large-diameter base portion 2 fixed to the ceiling surface and a small-diameter sensor portion 3 protruding from the center of the lower surface of the base portion 2 are provided. Common. The heat sensitive body 4 is housed in the lower sensor unit 3 and is exposed to the outside (downward) through the exposure port 5 on the bottom surface of the sensor unit 3. The heat-sensitive body 4A of the first fire sensor 1A shown in (a) is formed in a pin shape extending downward from the center of the lower surface of the base portion 2, and is a circular dew facing the tip (lower end) of the heat-sensitive body 4A. The outlet 5A is formed in the center of the bottom of the sensor unit 3. The heat-sensitive body 4B of the second fire detector 1B shown in (b) is formed in a horizontal disk shape, and the annular exposed port 5B facing the lower surface of the heat-sensitive body 4B is the bottom of the sensor unit 3. Is formed in. The diameter of the circular exposed port 5A is close to the inner diameter of the annular exposed port 5B and is sufficiently smaller than the outer diameter thereof.

Both fire detectors 1A. A heating tester that can also be used for 1B can be obtained. However, when this heating tester is used for the first fire detector 1A, heat is also radiated around the circular exposed port 5A, that is, the bottom wall of the sensor unit 3. Since the outer shell of the sensor unit 3 including the bottom wall is often made of thermoplastic, there is a risk of softening due to high heat. In order to avoid this inconvenience, if the range in which heat is radiated from the electric heater is narrowed, the heat radiated to the heat sensitive body 4B of the second fire detector 1B becomes insufficient, and this should be tested properly. May not be possible.

An object of the present invention is to provide a heating tester that can be used for testing a plurality of types of fire detectors 1A and 1B having different morphologies of the heat sensitive bodies 4A and 4B, and can appropriately test each of them. do.

The heating tester according to the present invention is arranged above the electric heater 22 for heating the heat-sensitive fire detector 1 and the electric heater 22, and directs the heat generated from the electric heater 22 to the fire detector 1. The heat radiating port 62 is provided with a heat radiating port 62 and a scaling mechanism 61 for changing the opening size of the radiating port 62 to a large or small size.

The expansion / contraction mechanism 61 includes a plurality of diaphragm blades 65 having heat insulating properties. Each diaphragm blade 65 swings around a swing axis 64 orthogonal to the installation surface of the fire detector 1 between a heat shield posture in which the heat radiation port 62 is minimized and an open posture in which the heat radiation port 62 is maximum. The heat dissipation port 62 at the minimum is movably supported by an axis, and is composed of a small opening 77 surrounded by a plurality of diaphragm blades 65 that take a heat shielding posture.

Each diaphragm blade 65 is connected to one link body 66 constituting the expansion / contraction mechanism 61 via an action pin 81 extending in parallel with the swing shaft 64, and the link body 66 rotates integrally with the action pin 81. When operated, each diaphragm blade 65 swings all at once around the swing shaft 64.

The electric heater 22 and the expansion / contraction mechanism 61 are housed in a hood 21 having an opening on the upper surface. The link body 66 is formed in a circular shape having a central opening in a plan view, and is arranged so as to be manually rotatable through the upper opening of the hood 21. The link body 66 is arranged via the upper opening of the hood 21 and the central opening of the link body 66. At least, each diaphragm blade 65 in the heat shield posture is visible.

Each diaphragm blade 65 is configured by vertically joining a horizontal upper blade plate 85 and a lower blade plate 86. The upper blade plate 85 and the lower blade plate 86 each include non-superimposing portions 88 and 89 that do not overlap each other, and the non-superimposing portion 88 of the upper blade plate 85 of each diaphragm blade 65 in the heat shielding posture is adjacent to the diaphragm blades. It overlaps with the non-superimposing portion 89 of the lower blade plate 86 of 65.

The heating tester according to the present invention includes a scaling mechanism 61 that changes the opening size of the heat radiating port 62 that discharges heat generated from the electric heater 22 toward the fire detector 1 to a large or small size. According to this heating tester, when the first fire detector 1A having the pin-shaped heat sensitive body 4A shown in FIG. 13A is tested, the opening size of the heat radiation port 62 is reduced by the expansion / contraction mechanism 61. As a result, the heat of the electric heater 22 can be radiated pinpointly only to the heat sensitive body 4A. That is, it is possible to avoid the inconvenience that the bottom wall of the sensor unit 3 surrounding the heat sensitive body 4A receives high heat and softens. On the other hand, when testing the second fire detector 1B having the disc-shaped heat sensitive body 4B shown in FIG. 13B, the heat of the electric heater 22 is heated by expanding the heat radiation port 62 by the expansion / contraction mechanism 61. Can be sufficiently radiated to the outer peripheral portion of the heat sensitive body 4B, and this can be properly tested. As described above, according to the present invention, the heating tester can be used for testing a plurality of types of fire detectors 1A and 1B having different morphologies of the heat sensitive bodies 4A and 4B, and can appropriately test each of them. Can be obtained.

When the expansion / contraction mechanism 61 swings a plurality of diaphragm blades 65 around the swing shaft 64 to expand / contract the heat radiation port 62, the user (test worker of the fire detector 1) tells each diaphragm blade. The size of the heat radiating port 62 can be changed only by swinging the 65, and the amount of radiant heat can be easily adjusted without the troublesome work of replacing parts. In addition, the expansion / contraction mechanism 61 can be made simple with few moving parts, and the risk of failure of the expansion / contraction mechanism 61 and the overall cost of the heating tester can be reduced.

Each throttle blade 65 is connected to one link body 66 via an action pin 81 so that each throttle blade 65 swings all around the swing shaft 64 when the link body 66 is rotated. Then, the user can simultaneously change the posture of each throttle blade 65 via each action pin 81 and expand / contract the heat radiation port 62 by simply rotating one link body 66.

When the expansion / contraction mechanism 61 is housed in the hood 21 together with the electric heater 22, even if the hood 21 strongly collides with the ceiling surface or the like, the expansion / contraction mechanism 61 can be prevented from directly impacting the mechanism. It is possible to prevent the 61 from being damaged. Further, when each diaphragm blade 65 is visible at least in the heat shielding posture through the upper opening of the hood 21 and the central opening of the link body 66, the user confirms the position of each diaphragm blade 65 while checking the link body 66. The posture of each diaphragm blade 65 can be easily changed by rotating the diaphragm blades 65.

Each diaphragm blade 65 is composed of an upper blade plate 85 and a lower blade plate 86 having non-superimposing portions 88 and 89, and the non-superimposition portion 88 of the upper blade plate 85 of each diaphragm blade 65 in a heat shielding posture is adjacent to each other. It can be overlapped with the non-superimposing portion 89 of the lower blade plate 86 of the diaphragm blade 65. In this way, the adjacent diaphragm blades 65 are configured to be partially superposed, in other words, if the overlapping of the swing trajectories of the diaphragm blades 65 is partially allowed, the area of each diaphragm blade 65 is increased by that amount. The heat radiation port 62 (small opening 77) surrounded by the diaphragm blades 65 in the heat-shielding posture can be made sufficiently small. Therefore, during the test of the first fire detector 1A, the bottom wall of the sensor unit 3 surrounding the heat sensitive body 4A can be prevented from being damaged by high heat, and the bottom wall of the sensor unit 3 can be more accurately protected. can.

It is a vertical sectional view of the main part of the heating tester which concerns on 1st Embodiment of this invention. It is a side view which shows the whole structure of the heating tester. It is a vertical sectional rear view of the tester body of the same heating tester. It is an exploded perspective view of the heater unit built in the tester main body and the expansion / contraction mechanism. It is a top view which shows the operation of the diaphragm blade which constitutes the expansion / contraction mechanism, (a) shows a heat-shielding posture, and (b) shows an open posture. It is a vertical sectional side view of a tester main body when a diaphragm blade takes a heat-shielding posture. It is a top view of the tester main body when a diaphragm blade takes a heat-shielding posture. It is a vertical sectional side view of a tester main body when a diaphragm blade takes an open posture. It is a top view of the tester main body when the diaphragm blade takes an open posture. It is a figure explaining the vertical slide of the outer cylinder with respect to the inner cylinder which constitutes the hood of a tester main body, (a) shows the advance position, and (b) shows the entry / exit position. It is a top view which shows the expansion / contraction mechanism of the heating tester which concerns on 2nd Embodiment of this invention. It is a vertical sectional view which shows the shape of the reflector of the heating tester. It is a front view and a bottom view of a heat-sensitive fire detector installed on the ceiling surface.

(First Embodiment) The first embodiment of the heating tester according to the present invention is shown in FIGS. 1 to 10. The front / rear, left / right, and up / down in the present embodiment follow the crossing arrows shown in FIGS. 2 and 3 and the front / back, left / right, and up / down indications shown in the vicinity of each arrow. The same shall apply in subsequent embodiments. Since the structure of the fire detector 1 tested by this heating tester is as described above with reference to FIG. 13, the description thereof will be omitted.

In FIG. 2, the heating tester 10 includes a support rod 11 gripped by a user (a test worker of a fire detector 1), an arm 12 connected to the upper end of the support rod 11 and extending diagonally upward, and an arm 12. The upper end portion is provided with a tester main body 13 rotatably supported by a shaft. The connecting portion between the support rod 11 and the arm 12 is provided with an angle adjusting mechanism 15 for adjusting the angle formed by both 11 and 12, and the user operates this to adjust both 11 and 12 at a desired angle. Can be fixed.

A battery 16 that serves as a power source for the electric heater 22 of the tester main body 13, which will be described in detail later, is built in the lower portion of the support rod 11. A connector of a power supply cable 18 for supplying power from the battery 16 to the electric heater 22 and a power supply switch 17 for turning the power supply on and off are provided on the upper portion of the support rod 11. The battery 16 is composed of, for example, a lithium ion storage battery. By energizing the electric heater 22 with the tester main body 13 covered with the fire detector 1 from below, the heat sensitive body 4 can be heated to test the fire detector 1.

As shown in FIG. 3, the arm 12 is configured by connecting a pair of left and right halves 19 at the central portion in the longitudinal direction thereof. The upper part of the arm 12 is formed in a bifurcated shape, and the tester main body 13 is arranged between them. The hood 21 forming the outer shell of the tester main body 13 is fixed to the inner cylinder 23 that accommodates the electric heater 22 and the like, the outer cylinder 24 that is externally fitted to the inner cylinder 23, and the lower side of the inner cylinder 23. It is composed of a round dish-shaped bottom lid 25. When the hood 21 is put on the fire detector 1 from below, the upper end of the outer cylinder 24 is received by the ceiling surface, the base portion 2 is inside the outer cylinder 24, and the sensor portion 3 is inside the inner cylinder 23. (See FIG. 6). Slits 26 that allow the power feeding cable 18 to be inserted are provided at two positions on the left and right of the bottom lid 25.

Both the inner cylinder 23 and the outer cylinder 24 are formed in a cylindrical shape having openings on the upper and lower surfaces. A pair of left and right rotating shafts 27 are radially projected on the outer peripheral surface of the outer cylinder 24, and a shaft hole for receiving the rotating shaft 27 is provided at the upper end of each half-split body 19 constituting the arm 12. 28 is provided. By connecting the half-split bodies 19 with bolts and nuts while the rotating shaft 27 is inserted into the shaft hole 28 of each half-split body 19, the entire tester body 13 can be rotated by the arm 12. Be provided.

In FIG. 4, the electric heater 22 is composed of three heating wires 30 wound in a coil shape. These heating wires 30 are arranged sideways so that the central axis of the coil is horizontal, and more specifically, they are arranged along each side of a virtual equilateral triangle surrounding the central axis of the inner cylinder 23. (See FIG. 5). By arranging each heating wire 30 in the horizontal direction, it is possible to contribute to the miniaturization of the vertical dimension of the inner cylinder 23 and the tester main body 13 as compared with the case where the heating wire 30 is arranged in the vertical direction. Examples of the material of the heating wire 30 include a platinum rhodium alloy and an iron-chromium aluminum alloy having excellent electric heating efficiency, in addition to general nichrome. In this embodiment, an iron-chromium-aluminum alloy that can be obtained at a relatively low cost is adopted.

The inner cylinder 23 accommodates an upper electrode plate 31 to which one end of each heating wire 30 is connected and a lower electrode plate 32 to which the other end of each heating wire 30 is connected. The upper electrode plate 31 is positively charged by being connected to, for example, the positive electrode of the battery 16 via the power feeding cable 18, and the lower electrode plate 32 is connected to, for example, the negative electrode of the battery 16 via the feeding cable 18. Is negatively charged. Of course, the positive and negative of the upper and lower electrode plates 31 and 32 may be reversed. An intermediate insulating plate 33 for preventing a short circuit between the upper and lower electrode plates 31 and 32 is arranged between the upper and lower electrode plates 31 and 32. Further, an upper insulating plate 34 is arranged on the upper surface side of the upper electrode plate 31, and a lower insulating plate 35 is arranged on the lower surface side of the lower electrode plate 32. The electrode plates 31 and 32 are made of a metal such as stainless steel, and the insulating plates 33 to 35 are formed of an insulating material such as mica.

Specifically, each of the electrode plates 31 and 32 includes a frame body 38 having a substantially annular plate shape, three inner connecting pieces 39 for a heating wire 30 extending horizontally from the inner peripheral edge of the frame body 38, and a frame body. An external connection piece 40 for a power feeding cable 18 extending horizontally from the outer peripheral edge of 38 and three fixing pieces 41 extending horizontally from the outer peripheral edge are integrally provided. In each of the electrode plates 31 and 32, the three inner connecting pieces 39 and the three fixing pieces 41 are provided at equal intervals in the circumferential direction of the frame body 38, respectively. Each fixed piece 41 is formed wider than the inner connecting piece 39 and the outer connecting piece 40, and a screw hole 42 for a screw 72, which will be described later, is provided at the tip thereof. Further, rivet holes 43 for rivets 57, which will be described later, are provided at three positions of the frame body 38.

The upper electrode plate 31 and the lower electrode plate 32 have the same shape except for the positions of the inner connection piece 39 and the outer connection piece 40. The inner connection pieces 39 are arranged so as to be out of phase by 60 degrees in the circumferential direction of the frame body 38, and the inner connection piece 39 of the upper electrode plate 31 and the inner connection piece 39 of the lower electrode plate 32 adjacent to each other in the circumferential direction. A heating wire 30 is provided between the two. The outer connection pieces 40 of the both electrode plates 31 and 32 are arranged so as to be out of phase by 180 degrees in the circumferential direction of the frame body 38, and the outer connection pieces 40 have the slit 26 of the bottom lid 25 and the inner cylinder body. The power feeding cable 18 introduced through the lower opening of 23 is connected.

Each of the insulating plates 33 to 35 has a substantially annular plate-shaped frame body 45, six triangular reinforcing pieces 46 extending horizontally from the inner peripheral edge of the frame body 45, and horizontally extending from the outer peripheral edge of the frame body 45. It is integrally provided with three fixing pieces 47. In each of the insulating plates 33 to 35, the six reinforcing pieces 46 and the three fixing pieces 47 are provided at equal intervals in the circumferential direction of the frame body 45, respectively. A screw hole 48 for the screw 72 is provided at the tip of each fixing piece 47, and a rivet hole 49 for the rivet 57 is provided at three positions of the frame body 45. The three insulating plates 33 to 35 have exactly the same shape.

The shapes of the frame 45 and the fixed piece 47 of the insulating plates 33 to 35 in the plan view match the shapes of the frame 38 and the fixed piece 41 of the electrode plates 31 and 32. Therefore, when the upper insulating plates 34, the upper electrode plate 31, the middle insulating plate 33, the lower electrode plate 32, and the lower insulating plate 35 are laminated in this order from the top, the plates 31 to 35 are combined with the frame body 38 of the electrode plates 31 and 32. The upper and lower sides of the fixed piece 41 are covered with insulating plates 33 to 35, and only the inner connecting piece 39 and the outer connecting piece 40 are exposed on the inner peripheral side or the outer peripheral side of the frame body 45 of the insulating plates 33 to 35. However, the base end portion of each inner connecting piece 39 of the upper electrode plate 31 is sandwiched between the upper insulating plate 34 and the reinforcing piece 46 of the middle insulating plate 33 at the top and bottom, and similarly, each inner connecting piece 39 of the lower electrode plate 32. The base end portion of the above is sandwiched between the middle insulating plate 33 and the reinforcing piece 46 of the lower insulating plate 35. When the base end portion of the inner connecting piece 39 is sandwiched between the reinforcing pieces 46 from above and below in this way, it is possible to prevent the base end portion from bending and the heating wire 30 from being separated from the inner connecting piece 39. Each of the insulating plates 33 to 35 is formed to be sufficiently thicker than each of the electrode plates 31 and 32 so that the reinforcing piece 46 can reliably protect the inner connecting piece 39.

A reverse hat-shaped reflector 52 is arranged on the lower surface side of the lower insulating plate 35. The reflector 52 is made of a metal such as stainless steel, and integrally includes a reflecting portion 53 that bulges downward in a dome shape and a ring plate-shaped fixing portion 54 that horizontally projects from the outer peripheral edge of the reflecting portion 53. The lower insulating plate 35 functions as an insulator between the reflector 52 and the lower electrode plate 32. The inner surface of the reflecting portion 53 facing the electric heater 22 from below can be mirror-finished to increase the heat reflectance, if necessary. By arranging the reflector 52, the heat radiated downward from the electric heater 22 can be reflected upward, that is, toward the fire detector 1, and the heat can be effectively used. The inner and outer diameters of the fixed portion 54 substantially match the inner diameter and outer diameter of the frame bodies 38 and 45 of the electrode plates 31 and 32 and the insulating plates 33 to 35, and the fixed portion 54 also has the frame body 38 and the outer diameter. Similar to 45, three rivet holes 55 are provided.

As shown in FIG. 1, rivets 57 are inserted from the lower surface side of the reflector 52 into the upper and lower electrode plates 31 and 32, the three insulating plates 33 to 35, and the rivet holes 43, 49, and 55 of the reflector 52. The tip of each rivet 57 is crimped on the upper surface side of the upper insulating plate 34, and the electrode plates 31 and 32, the insulating plates 33 to 35, and the reflector 52 are integrated. The hole diameter of the rivet hole 43 is formed sufficiently larger than the shaft diameter of the rivet 57 so that the metal rivet 57 does not touch the electrode plates 31 and 32 and short-circuit the electrode plates 31 and 32. However, since the electrode plates 31 and 32 are firmly sandwiched between the insulating plates 33 to 35 from above and below, they do not shift with respect to the insulating plates 33 to 35. On the other hand, the hole diameters of the insulating plates 33 to 35 and the rivet holes 49 and 55 of the reflector 52 are substantially the same as the shaft diameter of the rivet 57. The electrode plates 31 and 32, the insulating plates 33 to 35, the reflector 52, and the electric heater 22 constitute the heater unit 58. The entire heater unit 58 is supported by a support wall 59 that projects inward from the lower end of the cylinder wall of the inner cylinder 23. The reflective portion 53 of the reflector 52 projects downward from the lower opening of the inner cylinder 23 and is housed inside the bottom lid 25.

The amount of heat radiated from the electric heater 22 to the fire detector 1 is adjusted by the scaling mechanism 61 arranged on the inner cylinder 23 together with the heater unit 58. As shown in FIGS. 5 and 6, the scaling mechanism 61 changes the opening size of the heat radiation port 62 above the electric heating heater 22 to a large or small size, and by changing the opening size of the heat radiation port 62 in this way, the opening size of the heat radiation port 62 is changed. The amount of heat radiated to the fire detector 1 can be adjusted. The expansion / contraction mechanism 61 includes a base plate 63 arranged on the upper surface side of the heater unit 58, and three diaphragm blades 65 swingably supported around the swing shaft 64 on the upper surface side of the base plate 63. The link body 66 and the operating body 67 for operating all the diaphragm blades 65 in synchronization are arranged in the order described from the bottom.

In FIG. 4, the base plate 63 is formed by joining the upper base 69 and the lower base 70 having the same shape in a plan view vertically, and is outside the frame bodies 38 and 45 of the electrode plates 31 and 32 and the insulating plates 33 to 35. The diameter is one size larger and the inner diameter is formed in the shape of an annular plate having substantially the same diameter. The upper base 69 is formed of a heat insulating material such as mica, and the lower base 70 is formed of a metal such as stainless steel. The upper insulating plate 34 located below the lower base 70 functions as an insulator between the lower base 70 and the upper electrode plate 31.

Near the outer peripheral edge of the base plate 63, three screw holes 71 corresponding to the screw holes 42 and 48 of the electrode plates 31 and 32 and the insulating plates 33 to 35 are provided. As shown in FIG. 6, screws 72 are inserted into these screw holes 42, 48, and 71 from the upper surface side of the base plate 63. The tip of each screw 72 penetrates the support wall 59 of the inner cylinder 23 that supports the heater unit 58, and is screwed into the nut 73 arranged on the lower surface side of the support wall 59. The base plate 63 and the heater unit 58 are fastened and fixed to the support wall 59 by these three sets of screws 72 and nuts 73. The nut 73 is composed of both nuts having female screw holes at both ends (upper and lower ends). A screw 74 penetrating the bottom lid 25 from the lower surface side is screwed into the other end (lower end) of the nut 73, whereby the bottom lid 25 is fixed to the inner cylinder 23.

As shown in FIG. 5, each diaphragm blade 65 has a heat-shielding posture (a) partially superimposed on the upper surface side of the central opening 76 of the base plate 63 and retracts from above the central opening 76 (b). It is swingably supported around the swing shaft 64 in the vertical direction (direction orthogonal to the installation surface of the fire detector 1) with respect to the open posture. The heat dissipation port 62 between the electric heater 22 and the fire detector 1 is minimized when each throttle blade 65 takes a heat shielding posture, and is maximized when each throttle blade 65 takes an open posture. Specifically, in the heat shield posture of (a), a regular triangular small opening 77 surrounded by three diaphragm blades 65 is formed inside the central opening 76 in a plan view, and this small opening is formed. 77 functions as a heat dissipation port 62. On the other hand, in the open posture of (b), the central opening 76 of the base plate 63 functions as a heat dissipation port 62.

The swing shaft 64 is inserted into shaft holes 79.80 (see FIG. 4) provided in the base plate 63 and the diaphragm blade 65, respectively, and is connected to both 63 and 65 so as not to be movable in the radial direction. The three shaft holes 79 of the base plate 63 are provided at equal intervals in the circumferential direction of the base plate 63. The metal lower base 70 constituting the base plate 63 has excellent strength and exhibits a function of preventing wear of the shaft hole 79. The swing shaft 64 may be provided integrally with the base plate 63 or the diaphragm blade 65.

Around each swing shaft 64, a round shaft-shaped action pin 81 that applies a swing force to the diaphragm blade 65 is arranged. Each working pin 81 is inserted into a pin hole 82 (see FIG. 4) provided in the diaphragm blade 65, and is connected to the diaphragm blade 65 in a radial direction so as not to be movable. On the other hand, the base plate 63 is provided with a long hole-shaped (partially arcuate) swing hole 83 for guiding the action pin 81, and the swing hole 83 is within the range of the length of the base plate 63. Allows the action pin 81 to swing along the outer peripheral edge. The three swing holes 83 are provided at equal intervals along the outer peripheral edge of the base plate 63.

Each throttle blade 65 is composed of a horizontal upper blade plate 85 and a lower blade plate 86 that partially overlap each other, and two overlapping portions of both blade plates 85 and 86 are joined by a joining tool 87 such as a rivet. Has been done. Each blade plate 85/86 is formed of a heat insulating material such as mica. The lower end of the joining tool 87 projects downward from the lower surface of the lower blade plate 86 and is received by the upper surface of the base plate 63 (see FIG. 1) so that the base plate 63 and the diaphragm blade 65 do not come into surface contact with each other. The friction of the diaphragm blade 65 at the time of swinging can be reduced and the diaphragm blade 65 can be swung smoothly. Similarly, the upper end of the joining tool 87 also protrudes upward from the upper surface of the upper blade plate 85 and is received by the lower surface of the link body 66.

The upper blade plate 85 and the lower blade plate 86 each include non-overlapping portions 88 and 89 that do not overlap each other, and in the heat shielding posture shown in FIG. 5A, the upper blade plate 85 of each diaphragm blade 65 is non-overlapping. The superimposing portion 88 overlaps the non-superimposing portion 89 of the lower blade plate 86 of the diaphragm blade 65 adjacent in the counterclockwise direction. In this way, the upper surface side of the non-superimposing portion 89 of the lower blade plate 86 functions as a relief recess that can accept the non-superimposing portion 88 of the upper blade plate 85.

The diaphragm blade 65 may be composed of one thick plate, but in that case, the area (projected area in a plan view) must be reduced so that the swing trajectories of the diaphragm blades 65 do not overlap with each other. Therefore, it is difficult to make the heat dissipation port 62 (small opening 77) surrounded by the diaphragm blade 65 in the heat-shielding posture sufficiently small. On the other hand, as in the present embodiment, the adjacent diaphragm blades 65 are configured to be partially superposed, in other words, if the overlapping of the swing trajectories is partially allowed, the diaphragm blades 65 are corresponding to each other. The area can be increased, and as a result, the heat dissipation port 62 (small opening 77) surrounded by the diaphragm blades 65 in the heat-shielding posture can be sufficiently reduced.

In FIG. 4, the link body 66 is formed in an annular plate shape with a heat insulating material such as mica, and is arranged on the upper surface side of the three diaphragm blades 65. The outer diameter of the link body 66 is substantially the same as the outer diameter of the base plate 63, and the inner diameter of the link body 66 is the same as or larger than the inner diameter of the base plate 63. Three pin holes 91 through which the working pin 81 is inserted are provided at equal intervals in the circumferential direction near the outer peripheral edge of the link body 66, and each working pin 81 is radially oriented with respect to the link body 66. Is immovably linked to. When the link body 66 is rotated in a horizontal plane, the three action pins 81 move integrally with the link body 66 to apply a swinging force to each throttle blade 65, and each throttle blade 65 has a swing shaft 64. Swing all at once around. Each diaphragm blade 65 in the heat shield posture is visible from above through the central opening of the link body 66, and each diaphragm blade 65 in the open posture is invisiblely accommodated in the facing space between the link body 66 and the base plate 63. Will be done. The inner diameter of the link body 66 may be made as large as the inner diameter of the operating body 67, for example, so that each diaphragm blade 65 in the open posture can be visually recognized.

As shown in FIG. 3, the link body 66 is rotationally operated via the operating body 67 on the upper surface side thereof. The operating body 67 is an annular plastic molded product integrally including an inclined wall 92 formed in the shape of a bell mouth that expands upward and a horizontal wall 93 having an annular plate shape that projects outward from the lower end of the inclined wall 92. The inner diameter thereof is sufficiently larger than the inner diameter of the link body 66. The upper end of the inclined wall 92 is supported by the upper opening edge of the inner cylinder 23, and the horizontal wall 93 is connected to the upper surface side of the link body 66 by three sets of bolts 94 and nuts 95. The shaft portion of the bolt 94 constitutes the above-mentioned working pin 81. Notches 96 for exposing the operating head of the bolt 94 located on the upper surface side of the horizontal wall 93 upward are formed at three positions of the inclined wall 92 (see FIG. 7).

Each bolt 94 penetrates the horizontal wall 93 from the upper surface side, and further inserts the link body 66, the pin holes 91 and 82 of the diaphragm blade 65, and the swing hole 83 of the base plate 63 in the order described, and inserts the lower surface of the base plate 63. It is screwed into the nut 95 arranged on the side. The link body 66 and the link body 66 are in a state where the bolt 94 is sufficiently screwed into the nut 95, that is, in a state where the operating head of the bolt 94 is in close contact with the upper surface of the horizontal wall 93 and the nut 95 is in close contact with the lower surface of the base plate 63. There are some vertical gaps between the diaphragm blades 65 and between the diaphragm blades 65 and the base plate 63 due to the upper and lower ends of the above-mentioned joining tool 87 (see FIG. 1). That is, the diaphragm blade 65 is not sandwiched between the link body 66 and the base plate 63 from above and below, and its swing is not hindered.

This concludes the description of the configuration of the scaling mechanism 61. When the operating body 67 rotates in its circumferential direction, the link body 66 and each working pin 81 (bolt 94) move integrally with the operating body 67, and the diaphragm blades 65 swing around the swing shaft 64 all at once. At this time, since the base plate 63 is fixed to the inner cylinder 23, it does not move. The user of the heating tester 10 can access the operating body 67 through the upper opening of the outer cylinder body 24 and the inner cylinder body 23. Specifically, by placing a finger on the inclined wall 92 of the operating body 67 and rotating it in the circumferential direction, the three diaphragm blades 65 are swung between the heat shield posture and the open posture. , The heat radiation port 62 can be expanded or contracted. At this time, the user can easily change the posture while visually confirming the position of each diaphragm blade 65 through the upper opening of the hood 21 and the central opening of the operating body 67 and the link body 66. The three notches 96 formed in the inclined wall 92 also function as a finger hook for hooking the user's finger.

The heating tester 10 of the present embodiment provided with the scaling mechanism 61 can also be used for testing a plurality of types of fire detectors 1 having different forms of the heat sensitive body 4. When testing the first fire detector 1A having the pin-shaped heat sensitive body 4A shown in FIG. 13 (a), as shown in FIGS. 6 and 7, each throttle blade 65 is set as a heat shield posture and the heat radiation port 62 is used. To minimize. As a result, the heat of the electric heater 22 can be radiated pinpointly only to the heat sensitive body 4A, and the inconvenience that the bottom wall of the sensor unit 3 surrounding the heat sensitive body 4A receives high heat and softens can be avoided. On the other hand, when testing the second fire detector 1B having the disc-shaped heat sensitive body 4B shown in FIG. 13B, heat is dissipated with each throttle blade 65 in an open posture as shown in FIGS. 8 and 9. Maximize the mouth 62. As a result, the heat of the electric heater 22 can be sufficiently radiated to the outer peripheral portion of the heat sensitive body 4B, and this can be appropriately tested. As described above, the heating tester 10 according to the present embodiment can be used for both the tests of a plurality of types of fire detectors 1A and 1B having different forms of the heat sensitive bodies 4A and 4B, and each of them can be properly tested. Can be done.

As shown in FIG. 10, in many fire detectors 1, the large-diameter base portion 2 is fixed to the ceiling surface as shown in (a), and the small-diameter sensor portion 3 projects from the lower surface thereof, but (b). ), The base portion 2 is embedded in the ceiling wall, and only the sensor portion 3 is exposed from the ceiling surface. That is, in the third fire detector 1C shown in (b), the sensor unit 3 is located closer to the ceiling surface than the first fire detector 1A shown in (a). In order to cope with the test of the third fire detector 1C, in the heating tester 10 according to the present embodiment, the outer cylinder 24 constituting the hood 21 is configured to be slidable up and down with respect to the inner cylinder 23. There is. Specifically, the outer cylinder 24 protrudes upward from the upper end of the inner cylinder 23 by the amount corresponding to the vertical thickness of the base portion 2 (a) and does not protrude upward (b). It is configured to be able to slide up and down between the entrance position.

In order to fix the outer cylinder 24 to the inner cylinder 23 at each position, a pair of upper and lower fixing holes 98 made of female screw holes are provided on the outer peripheral surface of the inner cylinder 23. By screwing the male screw shaft of the fixing pin 99 that penetrates the peripheral wall of the outer cylinder 24 from the outside into one of the fixing holes 98, the outer cylinder 24 can be fixed at the advancing position or the retracting position. Guide structures 100 are provided at three locations on the facing peripheral surfaces of the inner cylinder 23 and the outer cylinder 24 to allow relative movement in the vertical direction (axial direction) and regulate relative movement in the circumferential direction. The guide structure 100 is composed of a slide groove 101 extending in the vertical direction and a protrusion 102 that slides along the groove 101. In the present embodiment, the slide groove 101 is provided on the outer peripheral surface of the inner cylinder 23, and the protrusion 102 is provided on the inner peripheral surface of the outer cylinder 24, but this relationship may be reversed.

When testing the third fire detector 1C, the inner cylinder 23 can be brought closer to the ceiling surface by switching the outer cylinder 24 from the advance position to the retract position. The distance from the electric heater 22 to the heat sensitive body 4C at this time is substantially equal to the distance from the electric heater 22 to the heat sensitive body 4A when the outer cylinder 24 is placed on the first fire detector 1A in the advanced position. That is, according to the heating tester 10 according to the present embodiment, the distance from the electric heater 22 to the heat sensitive body 4, that is, heat sensitive, regardless of the distance from the ceiling surface to the heat sensitive body 4 (sensor unit 3) of the fire detector 1. The amount of heat radiated to the body 4 can be equalized and this can be properly tested. The heating tester 10 according to the present embodiment is used for testing fire detectors 1A and 1C having different distances from the ceiling surface to the heat sensitive body 4 in addition to the fire detectors 1A and 1B having different forms of the heat sensitive bodies 4A and 4B. Can also be used.

(Second Embodiment) A second embodiment of the heating tester according to the present invention is shown in FIGS. 11 and 12. Here, the electric heater 22 is composed of four external heating wires 30A arranged near the peripheral edge of the central opening 76 of the base plate 63 and two internal heating wires 30B arranged near the center of the central opening 76. Will be done. Similar to the heating wire 30 of the first embodiment, these heating wires 30A and 30B are provided between the inner connecting piece 39 of the upper electrode plate 31 adjacent in the circumferential direction and the inner connecting piece 39 of the lower electrode plate 32. .. However, the inner connecting piece 39 for the internal heating wire 30B is sufficiently longer than the inner connecting piece 39 for the internal heating wire 30B, and extends close to the center of the central opening 76.

As shown by a virtual line in the center of FIG. 11, the small opening 77 surrounded by the three diaphragm blades 65 in the heat-shielding posture has a regular hexagonal shape, and two internal heating wires 30B are directly below the small opening 77. positioned. In FIG. 12, the reflection portion 53 of the reflector 52 has a double structure in which the downward convex dome-shaped internal reflection portion 53A is surrounded by the annular plate-shaped external reflection portion 53B, and the cross section of the external reflection portion 53B is the internal reflection portion. It has an arc shape that bulges smaller than 53A. The circle that is the boundary between the internal reflection portion 53A and the external reflection portion 53B is larger than the small opening 77, that is, the heat radiation port 62 at the minimum, and sufficiently smaller than the central opening 76 of the base plate 63, that is, the heat radiation port 62 at the maximum. Since other configurations and actions and effects are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

In each of the above embodiments, the number of diaphragm blades 65 constituting the expansion / contraction mechanism 61 is three, but the number of diaphragm blades 65 can be arbitrarily selected. When each diaphragm blade 65 takes an open posture, that is, the maximum heat radiation port 62 may be the inner peripheral edge of the link body 66 or the upper insulating plate 34 in addition to the central opening 76 of the base plate 63, or at the minimum. It may be surrounded by the diaphragm blade 65 in the same manner as above. Instead of indirectly rotating the link body 66 via the operating body 67, the operating body 67 may be omitted and the link body 66 may be directly rotated. 66 can be formed in a donut shape or a roller shape, for example, in addition to the plate shape.

1 Fire detector 4 Heat sensitive body 10 Heat tester 21 Hood 22 Electric heat heater 61 Expansion / contraction mechanism 62 Heat dissipation port 63 Base plate 64 Swing shaft 65 Aperture blade 66 Link body 77 Small opening 81 Action pin 85 Upper blade plate 86 Lower blade plate 88 Non-superimposed part 89 Non-superimposed part

Claims (5)

An electric heater (22) for heating the heat-sensitive fire detector (1), and
A heat radiating port (62) arranged above the electric heater (22) and discharging heat generated from the electric heater (22) toward the fire detector (1).
An expansion / contraction mechanism (61) that changes the opening size of the heat radiation port (62) to a large or small size,
A heating tester characterized by being equipped with. The scaling mechanism (61) includes a plurality of diaphragm blades (65) having heat insulating properties.
Each diaphragm blade (65) is orthogonal to the installation surface of the fire detector (1) between the heat shield posture in which the heat radiation port (62) is minimized and the open posture in which the heat radiation port (62) is maximum. It is oscillatedly supported around the oscillating shaft (64).
The heating tester according to claim 1, wherein the heat dissipation port (62) at the minimum is composed of a small opening (77) surrounded by a plurality of diaphragm blades (65) in a heat-shielding posture. Each diaphragm blade (65) is connected to one link body (66) constituting the expansion / contraction mechanism (61) via an action pin (81) extending in parallel with the swing shaft (64).
The heating tester according to claim 2, wherein when the link body (66) is rotated integrally with the action pin (81), each diaphragm blade (65) swings all at once around the swing shaft (64). .. The electric heater (22) and the scaling mechanism (61) are housed in a hood (21) having an opening on the upper surface.
The link body (66) is formed in a circular shape with the center opening in a plan view, and is arranged so as to be manually rotatable through the upper opening of the hood (21).
The heating tester according to claim 3, wherein each diaphragm blade (65) is visible at least in a heat-shielding posture through the upper opening of the hood (21) and the central opening of the link body (66). Each diaphragm blade (65) is configured by joining a horizontal upper blade plate (85) and a lower blade plate (86) vertically.
The upper blade plate (85) and the lower blade plate (86) each have a non-overlapping portion (88/89) that does not overlap with each other.
The non-superimposing portion (88) of the upper blade plate (85) of each diaphragm blade (65) in the heat shield posture overlaps the non-superimposing portion (89) of the lower blade plate (86) of the adjacent diaphragm blades (65). The heating tester according to any one of claims 2 to 4.

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