Embedded type sensor base and fire sensor

Abstract

To solve the problem that a wireless transmission function of antennas is insufficient due to an obstacle such as a ceiling when the antennas are arranged close to a circuit board and positioned on an upper side of a ceiling lower surface in a case where a fire sensor is formed by placing a wireless fire sensor in an embedded type sensor base.SOLUTION: An embedded type sensor base includes: a flange on which antennas are arranged; and connection terminals for connecting the antennas to a fire sensor. A signal from the fire sensor is wirelessly transmitted from the antennas.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an embedded type detector base for installing a fire detector, and to the fire detector. [Background technology]

[0002] A fire detector can be installed by attaching the fire detector further below a detector base (base part) fixed under the ceiling, as in Patent Document 1. A fire detector with this structure has a large portion that protrudes below the ceiling. Therefore, as in Patent Document 2, a recessed type detector base is used and the components other than the detection circuit are installed above the underside of the ceiling, thereby reducing the protruding portion.

[0003] Meanwhile, wireless fire detectors that transmit fire information and the like wirelessly are known (see Patent Document 3). Wireless fire detectors are equipped with a wireless transmitter and antenna inside, and transmit a fire signal wirelessly when a fire is detected. Other wireless fire detectors and fire receivers that receive the wireless fire signal then issue a fire alarm. In addition, fire-related information such as a smoke density signal can be transmitted wirelessly, allowing the fire receiver or the like to determine whether a fire has occurred. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-111618 A [Patent Document 2] JP 2001-283344 A [Patent Document 3] JP 2011-248545 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a wireless fire detector is installed in a built-in detector base to form a fire detector, the antenna is placed near the circuit board and is located above the ceiling bottom surface. An antenna in such a position cannot fully utilize its wireless transmission function because the ceiling or other obstacles obstruct it. [Means for solving the problem]

[0006] One embodiment of the present invention relates to an embedded sensor base that comprises a flange on which an antenna is mounted and a connection terminal for connecting the antenna to a fire sensor, and is characterized in that a signal from the fire sensor is wirelessly transmitted from the antenna.

[0007] In addition, a fire detector according to one embodiment of the present invention comprises a fire detection unit, a control unit, a battery, a wireless transmission unit, and a mounting bracket for an embedded detector base, and is characterized in that a wireless conductor connected to the wireless transmission unit is connected to the mounting bracket. Effect of the Invention

[0008] According to the present invention, in a wireless fire detector, the antenna can be provided outside the fire detector, thereby improving the performance of wireless transmission. [Brief description of the drawings]

[0009] [Figure 1] 2 is a cross-sectional view of an embodiment of an implantable sensor base. [Diagram 2] FIG. 2 is a bottom view of an embodiment of an implantable sensor base. [Diagram 3] 1 is a cross-sectional view of an embedded type detector base to which a fire detector according to an embodiment is attached. [Figure 4] FIG. 1 is a cross-sectional view of an embedded type detector base with a conventional fire detector mounted thereon. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the following description, the up-down direction will be described based on the direction when the fire detector is installed on the ceiling.

[0011] FIG. 4 shows a cross-sectional view of a conventional fire detector 4 and an embedded detector base 3 to which the fire detector 4 is attached. The embedded detector base 3 has a shape in which a circular mounting base back plate 31 provided at the top and a circular flange 33 at the bottom are connected by a cylindrical portion 32. The mounting base back plate 31 and most of the cylindrical portion 32 of the embedded detector base 3 are inserted from below into a hole provided in a ceiling plate C. Then, the tip of the pressing piece 34 is lowered by a screw 35 inserted through a screw hole in the mounting base back plate 31, and the ceiling plate C is sandwiched between the flange 33 and the embedded detector base 3, so that the embedded detector base 3 is fixed to the ceiling plate C. The fire detector 4 is a wireless type that does not require wiring of a sensing line, and when it detects a fire, it sounds an alarm and transmits a fire detection signal wirelessly. The fire detection signal is received by a wireless receiver such as another fire detector (not shown) or a fire receiver (not shown), and a fire alarm or the like is issued by the other fire detector or fire receiver.

[0012] The fire detector 4 is removably attached to an embedded detector base 3 fixed to a ceiling panel C. The fire detector 4 has a circuit board 41 inside. A control unit 42, a battery 43, a fire detection unit 44, a transmitting / receiving device 45, a wireless conductor 46, etc. are attached to the circuit board 41. The transmitting / receiving device 45, which functions as a wireless transmitter, is connected to an antenna 47 via the wireless conductor 46. The antenna 47 extends in a curved shape along the inner surface of the cylindrical fire detector 4. When the fire detector 4 detects a fire, the transmitting / receiving device 45 generates a wireless signal and sends it to the wireless conductor 46. The wireless signal is transmitted from the wireless conductor 46 to the antenna 47 and wirelessly transmitted from the antenna 47.

[0013] Since the antenna 47 is installed above the ceiling board C, there is a possibility that the ceiling board C or the like will become an obstacle, reducing the radio wave intensity of wireless transmission and reception. Although it is possible to arrange the antenna 47 fixed to the circuit board 41 so as to extend below the fire detector 4, this would mean extending far from the circuit board 41, which would make it difficult to assemble the fire detector, for example, by causing the antenna to be bent during assembly. In addition, extending the antenna 47 below the fire detector 4 is not preferable in terms of design.

[0014] 1 shows a cross-sectional view of an embedded sensor base 1 in an embodiment of the present invention. The embedded sensor base 1 has a shape in which an annular mounting base back plate 11 provided at the top and an annular flange 13 at the bottom are connected by a cylindrical portion 12. The space surrounded by the mounting base back plate 11 and the cylindrical portion 12 forms a fitting space 14. The mounting base back plate 11 and most of the cylindrical portion 12 of the embedded sensor base 1 are inserted from below into a hole provided in a ceiling plate C. Then, the tip of the pressing piece 16 is lowered by a screw 17 inserted through a screw hole in the mounting base back plate 11, and the ceiling plate C is sandwiched between the flange 13 and the embedded sensor base 1, thereby fixing the embedded sensor base 1 to the ceiling plate C.

[0015] The embedded sensor base 1 of the embodiment is provided with two antennas 18, which are connected to the blade receiving bracket 15 near the mounting base rear plate 11. Below the embedded sensor base 1, the antennas 18 extend in an arc shape along the outside of the cylindrical portion 12, above the flange 13. The antennas 18 are located below the underside of the ceiling plate C, and extend near the inside of the annular flange 13.

[0016] 2 shows a bottom view of the embedded sensor base 1 of the embodiment. An annular flange 13 is provided on the outside of the mounting base rear plate 11, and the mounting base rear plate 11 and the flange 13 are connected by the cylindrical portion 12 shown in FIG. 1. Two screws 17 are fitted into the mounting base rear plate 11, and two prong receiving metal fittings 15 are provided. The prong receiving metal fittings 15 are formed of an elastic metal plate. Two antennas 18 are also shown by dotted lines. The antennas 18 are provided on the back side of the flange 13, and are provided along the circumference of the flange 13. The antennas 18 are electrically connected to the prong receiving metal fittings 15.

[0017] Fig. 3 shows a cross-sectional view of the embedded sensor base 1 to which the fire sensor 2 of the embodiment is attached. The fire sensor 2 is fitted into the fitting space 14 of the embedded sensor base 1 shown in Fig. 1. The fire sensor 2 has a circuit board 21 therein. A control unit 22, a battery 23, a fire detection unit 24, a transmitting / receiving device 25, a wireless conductor 26, etc. are attached to the circuit board 21. The transmitting / receiving device 25, which functions as a wireless transmitter, is connected to a cutting edge fitting 27 via the wireless conductor 26.

[0018] The blade fitting 27 is located above the blade receiving fitting 15 of the embedded detector base 1 and is engaged with the blade receiving fitting 15. The blade receiving fitting 15 functions as a mounting fitting for mounting the fire detector 2 to the embedded detector base 1. The same is true for the blade fitting 27. The fire detector 2 fitted into the fitting space 14 is mounted to the embedded detector base 1 by the blade receiving fitting 15 and the blade receiving fitting 27, which are the mounting fittings. Also, as shown in FIG. 3, when the fire detector 2 is mounted to the embedded detector base 1, the blade fitting 27 is electrically connected to the blade receiving fitting 15, and a wireless signal from the transmitting / receiving device 25 of the fire detector 2 is sent to the antenna 18 via the wireless conductor 26, the blade fitting 27, and the blade receiving fitting 15. Then, the signal is wirelessly transmitted from the antenna 18. The blade fitting 27 also functions as a connection terminal. The same is true for the blade receiving fitting 15.

[0019] The embedded sensor base 1 and the fire sensor 2 of the embodiment wirelessly transmit signals from the antenna 18 provided on the back side of the flange 13 of the embedded sensor base 1 by using a wireless signal generated by the fire sensor 2. This allows the antenna 18 to be located lower than the ceiling board C without difficulty. In addition, the radius of the antenna 18 is larger than the radius of the fire sensor 2. With these configurations, the embedded sensor base 1 and the fire sensor 2 of the embodiment are less likely to experience a decrease in radio wave intensity during wireless transmission and reception. In addition, since the embedded sensor base 1 has the antenna 18 disposed on the flange 13, no additional flange is provided on the outer periphery of the flange 13, which is the housing member for the antenna 18. Therefore, there are almost no members that affect the decrease in radio wave intensity in the outer periphery, particularly with respect to radio waves in the horizontal direction relative to the ceiling surface, and therefore the radio wave intensity is less likely to decrease.

[0020] Although the antenna 18 in the embodiment is installed along the outer periphery of the cylindrical portion 12, it may be installed at a position away from the outer periphery of the cylindrical portion 12. In that case, the radius of the antenna can be made wider. If a flange with a larger outer periphery is used, the radius of the antenna can be made even wider. Also, although two antennas 18 are provided on the flange in the embodiment, one antenna may be provided on the flange and the other antenna may be provided inside the fire detector.

[0021] In the embedded sensor base 1 of the embodiment, the vertical portion of the antenna 18 passes through the inside of the cylindrical portion 12 and reaches the back side of the flange 13. However, a groove may be provided on the outside or inside of the cylindrical portion, and the vertical portion of the antenna may be fitted into the groove.

[0022] Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to the embodiment, and the present invention also includes design changes and the like that do not deviate from the gist of the present invention. [Explanation of symbols]

[0023] 1 embedded type sensor base, 11 mounting base rear plate, 12 cylindrical portion, 13 flange, 14 fitting space, 15 blade receiving bracket, 16 pressing piece, 17 screw, 18 antenna, 2 Fire detector, 21 Circuit board, 22 Control unit, 23 Battery, 24 Fire detector, 25 Transmitter / receiver, 26 Wireless conductor, 27 Blade metal fitting, 3 embedded sensor base, 31 mounting base rear plate, 32 cylindrical portion, 33 flange, 34 retaining piece, 35 screw, 4 Fire detector, 41 Circuit board, 42 Control unit, 43 Battery, 44 Fire detector, 45 Transmitter / receiver, 46 Wireless conductor, 47 Antenna, C Ceiling board

Claims

1. A flange on which the antenna is mounted; a connection terminal for connecting the antenna to a fire detector, A signal from a fire detector is wirelessly transmitted from the antenna. Recessed sensor based.

2. The connection terminal is a mounting bracket for mounting a fire detector.

2. An embeddable sensor base as claimed in claim 1.

3. 3. The embedded sensor base according to claim 1, wherein the antenna is provided along a circumference of the flange.

4. A fire detector; A control unit; Battery and A wireless transmitter; Equipped with mounting brackets for mounting to the embedded detector base, A fire detector characterized in that a wireless conductor connected to the wireless transmitting unit is connected to the mounting bracket.

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