JP7436676B2 - Sensor base and sensing device - Google Patents

Description

The present invention relates to a sensor base for installing a sensor for detecting an abnormality such as fire or smoke on a ceiling or wall, and a sensor base and a sensor (smoke detector, heat sensor, infrared ray sensor). Detector, etc.)

The detector is configured to be removably attached to a detector base installed on the ceiling of a building, etc., and the detector base is connected to a fire alarm via wiring called a detector line installed in the ceiling etc. It is connected to a receiver installed in a monitoring room, etc. A plurality of sensor bases are connected to one sensor line, and a fire detector is attached to each sensor base.
Generally, when the installation of a sensor line in a building and the installation of a sensor base are completed, a continuity test is performed to confirm whether the line has been installed correctly. To test the continuity of the sensor line, before installing the sensor on the sensor base, establish continuity between the positive or negative power input and output terminals on each sensor base, and then connect the sensor at the end of the line. This is done by measuring the voltage or current between the positive and negative power terminals on the base using a tester or the like.

Conventionally, in order to establish continuity between a pair of power input/output terminals on the positive or negative side of each sensor base before installing the sensor, a short-circuiting wire spring was used to connect the terminals of the same polarity. discloses an invention relating to a sensor base that is electrically connected and allows easy removal of a short-circuiting linear spring after a line inspection is completed (see Patent Document 1).
The present invention also relates to a sensor base in which an arc-shaped metal piece is provided between the terminals to be electrically connected, and by sliding the arc-shaped metal piece, electrical continuity can be established or interrupted between a pair of terminals. The invention has been disclosed (see Patent Document 2).

Japanese Patent Application Publication No. 05-303692 British Patent Application Publication No. 2396752

In the sensor base of Patent Document 1, when conducting a continuity test after installing a sensor line, the end of a short-circuiting wire spring is inserted between terminals of the same polarity of each sensor base to connect them, and the test is completed. It is necessary to remove the short-circuiting wire spring afterwards. In addition, in the sensor base of Patent Document 2, electrical conduction and interruption are performed by a short-circuiting arc-shaped metal piece provided between the terminals to be electrically connected, but the operation of sliding the arc-shaped metal piece is done manually. ).
Therefore, in both the sensor bases of Patent Documents 1 and 2, it is troublesome to set the continuity/cutoff of the short-circuiting means between predetermined terminals during a continuity test, and the work of setting the continuity/cutoff of the short-circuiting means is a laborious task. Since this is left to the individual, there is a risk of configuration errors.

Additionally, there are two types of sensors: one type in which multiple sensors are monitored for each sensor line, and the other type in which multiple sensors connected to a sensor line are managed individually using individual addresses. .
Specifically, in the case of a conventional type sensor used in a system that monitors multiple sensors per sensor line, even one sensor connected to the sensor line can detect If the device comes off the base, it is desirable to detect this and issue an alarm. Therefore, as shown in FIG. 11A, during the continuity test after installing the sensor line, the continuity state "A" set by the shorting means in the sensor base DB is changed to the cutoff state "B" by installing the sensor. , it is desirable to maintain the cut-off state "C" even if the sensor is disconnected.
Note that even if the negative power input terminal 6 and the negative power output terminal 1 are electrically disconnected in the sensor base DB due to the installation of the sensor, the terminal 6 is connected via the power line inside the sensor. and terminal 1 becomes conductive. This allows power to be transmitted to adjacent sensors connected to the same sensor line.

On the other hand, in the case of an analog type sensor used in a system where multiple sensors connected to one sensor line are managed by individual addresses, even if the sensor is removed from the sensor base, it will not be removed. The detected sensor can be identified by the fact that it becomes unable to communicate. Therefore, since other sensors can be appropriately managed by the receiver connected via the sensor line, it is desirable that the sensor line maintains a monitoring state. Therefore, as shown in FIG. 11B, during the continuity test after installing the sensor line, the continuity state "A" set by the shorting means in the sensor base DB is changed to the cutoff state "B" by installing the sensor. , it is desired to switch to the conductive state "C" when the sensor is disconnected.
However, in both the sensor bases of Patent Documents 1 and 2, the setting of the short-circuiting means is left to the operator's judgment, so there is a risk of setting the short-circuiting means incorrectly when the sensor is removed. There are challenges.

The present invention has been made with attention to the above-mentioned problems, and its purpose is to provide short-circuiting means between predetermined terminals depending on the type of sensor after a continuity test after installing a sensor line. It is an object of the present invention to provide a sensor base and a sensing device that allow easy conduction/cutoff setting work.
Another object of the present invention is to prevent setting errors from occurring when setting the continuity/cutoff of shorting means between predetermined terminals depending on the type of sensor after a continuity test after installing a sensor line. An object of the present invention is to provide a sensor base and a sensing device that can prevent the above.

In order to solve the above problems, this invention
A bottom plate having a circular shape, a peripheral wall provided along a peripheral edge of the bottom plate, and a plurality of connection terminals arranged on the bottom plate at predetermined intervals in a circumferential direction, In a sensor base configured to be able to attach a sensor equipped with a plurality of external terminals that can be contacted with each of the connection terminals of the sensor base,
A short-circuiting member is provided between any two of the plurality of connection terminals, the shorting member having a pair of contact portions at both ends capable of contacting the two connection terminals, respectively, and disposed so as to be movable back and forth in a predetermined direction;
The short circuit member is provided with two protrusions having different heights,
When the shorting member is moved to one side of the movement range by a force acting on one of the two protrusions, the contact parts at both ends are brought into contact with the corresponding two connection terminals,
When the shorting member is moved to the other side of the movement range by a force acting on the other of the two protrusions, at least one of the contact parts at both ends is separated from the corresponding connection terminal. It is composed of

According to the sensor base having the above configuration, the shorting member is disposed between any two connection terminals in a reciprocating manner, so that by moving the shorting member, the corresponding two The connection terminals are brought into an electrically conductive state or a non-conductive state. In addition, since the short-circuiting member is provided with two protrusions with different heights, there is a mechanism that uses these protrusions with different heights to move the short-circuiting member in both directions, and a mechanism that moves the short-circuiting member in both directions. A mechanism for moving it can be provided.

Here, the short circuit member is provided with two protrusions having different heights from the surface of the bottom plate, and a guide structure for guiding the short circuit member is provided inside the peripheral wall.
According to this configuration, since the shorting member is provided with two protrusions having different heights from the surface of the bottom plate, when a protrusion that can intersect with the two protrusions is provided on the sensor base, , it becomes easier to avoid interference with other parts and parts. Further, the guide structure allows stable movement of the shorting member.

Further, the peripheral wall is an outer peripheral wall and an inner wall formed inside the outer peripheral wall with a predetermined interval,
Each of the plurality of connection terminals extends close to the inner wall,
The short circuit member has an arc shape and is configured to be movable along the inner circumferential surface of the inner wall.
According to this configuration, it is possible to realize a guide structure in which the shorting member is guided and moved by using the inner wall, and the case of the sensor coupled to the sensor base can be formed by the outer circumferential wall and the inner wall. A fitting part can be constructed.

Furthermore, the short-circuiting member has a main body portion in the form of a strip, and the main body portion has an elongated slit formed in the moving direction,
A locking piece having a claw that can be engaged with the slit is provided on the bottom plate in parallel with the main body.
According to this configuration, the locking piece can prevent the shorting member from slipping out from the sensor base.

Furthermore, the locking piece is formed such that the claw faces the inner circumferential surface of the inner wall,
A side surface of the short-circuiting member is provided with a protrusion that contacts the inner circumferential surface of the inner wall.
According to this configuration, the protrusion provided on the side surface of the short-circuiting member pushes the short-circuiting member toward the locking piece, making it difficult for the slit of the short-circuiting member to disengage from the claw of the locking piece. .

Further, a groove is formed at a predetermined position on the inner circumferential surface of the inner wall so that the protrusion on the side surface of the short circuit member can be guided in the height direction of the inner wall.
According to this configuration, the short-circuiting member can be easily disposed in a state where it is accurately positioned at a predetermined location.

Further, a plurality of the guide structures are provided inside the inner wall so as to correspond between different connection terminals, and the shorting member is selectively disposed on any one of the plurality of guide structures. Make it.
According to this configuration, the sensor base can be used in common for products in which the two connecting terminals to which short-circuiting members are to be provided are different, and costs can be reduced.

Further, the connection terminal is made of a plate-shaped conductive material,
The contact portions at both ends of the short-circuiting member are formed by a pair of curved pieces that respectively sandwich and contact the connection terminal from above and below.
According to this configuration, the contact surface between the short-circuiting member and the connection terminal can be increased to improve the electrical continuity state.

Another invention of the present application is a sensing device comprising a sensor base having the above configuration and a sensor coupled to the sensor base,
The bottom surface of the case of the sensor includes a plurality of external terminals that can contact each of the plurality of connection terminals, and a sensor and a sensor base that are located between the two protrusions facing the short circuit member. A protrusion is provided with a height that can interfere with at least one of the two protrusions when the protrusions are rotated in a fitted state.
According to the sensing device having the above configuration, by fitting the sensor into the sensor base and rotating the sensor, the shorting member is moved in a desired direction, and a conductive state is established between the two corresponding connection terminals. Or it can be made to transition to a non-conducting state.

According to the sensor base and sensing device according to the present invention, it is possible to easily set the conduction/cutoff of the shorting means between predetermined terminals during a continuity test after installing the sensor line. Furthermore, it is possible to prevent setting errors from occurring when setting the continuity/cutoff of the shorting means between predetermined terminals during a continuity test after installing the sensor line.

FIG. 2 is a perspective view showing the structure of the front side of an embodiment of the sensor base according to the present invention. It is a perspective view showing the structure of the back side of the sensor base of an embodiment. It is a partially enlarged bottom view showing details of the first screw insertion slit of the sensor base of the embodiment. It is a partially enlarged perspective view showing the details of the second screw insertion slit of the sensor base of the embodiment. It is a perspective view showing a specific example of a short circuit piece which constitutes a sensor base of an embodiment. 5A is a perspective view of the shorting piece shown in FIG. 5A viewed from another direction. FIG. FIG. 7 is a partially enlarged perspective view showing a state in which the shorting piece is disposed within the sensor base. FIG. 3 is a partially enlarged perspective view showing a connection state between a shorting piece and a connecting terminal. FIG. 3 is a sectional view of a main part showing a state in which a shorting piece is disposed within a sensor base. FIG. 3 is a partially enlarged perspective view showing the relationship between the shorting piece and a tall protrusion on the sensor side. FIG. 3 is a partially enlarged perspective view showing the relationship between the shorting piece and a tall protrusion on the sensor side. FIG. 6 is a partially enlarged perspective view showing the relationship between the shorting piece and a low protrusion on the sensor side. FIG. 6 is a partially enlarged perspective view showing the relationship between the shorting piece and a low protrusion on the sensor side. FIG. 3 is a perspective view showing the structure of the bottom surface of the main body case of the sensor. It is a perspective view showing the structure of the bottom of the main body case of another type of sensor. FIG. 7 is a partially enlarged perspective view showing details of a terminal number display section of the connection terminal of the sensor base according to the embodiment. 10A is a perspective view of the terminal number display section shown in FIG. 10A viewed from the opposite side. FIG. FIG. 2 is a circuit diagram showing a state of transition of a connection state between terminals of a sensor base in a sensor line using a conventional type sensor. FIG. 3 is a circuit diagram showing a state of transition of a connection state between terminals of a sensor base in a sensor line using an analog type sensor.

Hereinafter, embodiments of a sensor base according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the structure on the front side of the sensor base 10 of this embodiment, and FIG. 2 is a perspective view showing the structure on the back side.

The sensor base 10 is generally fixedly installed on the ceiling surface of a building with the back side facing upward and the front side facing downward, and the sensor is attached to the front side. In addition, the sensor base is connected to a receiver (not shown) that centrally manages multiple sensors in the detection target area, and when the sensor detects an event such as a flame, it senses a detection signal from the sensor. Notification is sent to the receiver via the terminal provided on the sensor base and the wiring (sensor line) connected to the terminal.
The sensor attached to the sensor base may be any type of sensor, such as a heat sensor equipped with a thermistor, a smoke detector equipped with a photoelectric element, or a flame detector equipped with an infrared sensor. Also good.

The sensor base 10 of this embodiment is made of synthetic resin, and as shown in FIG. Connecting terminals 12A to 12F are arranged radially on the circular bottom plate 11a, screws 13A to 13F are used to fix the connecting terminals 12A to 12F on the bottom plate 11a, and the core wires of the wiring are connected to the terminals 12A. -12F are provided with screws 14A-14F and safety washers 15A-15F for electrical connection.

Each of the connection terminals 12A to 12F has an anti-L shape, and an insertion hole through which the screws 13A to 13F are inserted is formed at the intersection of the short side and the long side. Insertion holes into which the screws 14A to 14F are inserted are formed on the shorter side.
An outer circumferential wall 11b is provided around the bottom plate 11a, and an inner wall 11c having the same height as the outer circumferential wall 11b with a slight gap is formed inside the outer circumferential wall 11b. A circular wall provided at the bottom of the sensor case is inserted between the base body 11 and the inner wall 11c, so that the sensor case is fitted to the base body 11.

Further, on the bottom plate 11a of the base body 11, arc-shaped terminal supporting ribs 11e1 and 11e2, which are lower in height than the inner wall 11c, are formed. The connection terminals 12A to 12F are arranged so that the longer sides of the terminals 12A to 12F are in contact with each other. As a result, gaps are formed between the longer sides of the connection terminals 12A to 12F and the inner surface of the bottom plate 11a of the base body 11, and the sensor side terminals 22A to 22F (see FIG. 9) are inserted into these gaps. It is configured to enter and make contact so that an electrical connection can be made. (The above example shows an example with six terminals 22A to 22F, but if a terminal that is not used as a sensor, for example, terminal 22D, is not used, that terminal itself does not need to be installed.)

Furthermore, as shown in FIG. 2, a circular opening 11f is formed in the center of the bottom plate 11a of the base body 11, through which the wiring extending from the ceiling side passes. In addition, the bottom plate 11a has slits 11g1 and 11g2 through which the necks of two screws, which are provided in advance at the installation location (ceiling surface) of the base body 11 with their heads facing downward (floor surface), can be inserted. are formed to extend in the radial direction of the base body with the opening 11f in between.
The slits 11g1 and 11g2 are formed at a position one step lower than the inner surface of the bottom plate 11a, and the width of the slits 11g1 and 11g2 is equal to the head of the screw for fixing the base body 11 to the ceiling surface. It is set smaller than the diameter of the screw and larger than the diameter of the neck of the screw.

Further, among the slits 11g1 and 11g2, the slit 11g1 is bent at an approximately right angle at its outer end, as shown in an enlarged view in FIG. A screw insertion hole 11h having a slightly larger diameter than the head of the screw is formed.
As shown in an enlarged view in FIG. 4, the inner end of the other slit 11g2 is provided with a notch 11i that forms an entrance large enough to allow the head of the screw to pass through. There is. When the head of the screw is fitted into the notch 11i so that the top surface contacts the back surface of the bottom plate 11a, the neck of the screw can move along the slit 11g2.

Therefore, with the head facing downward at the base installation position on the ceiling surface, insert the screw insertion hole 11h and the entrance part (notch) into the heads of the two screws installed at a predetermined interval. The sensor base 10 is joined to the ceiling surface so that the portion 11i) is aligned with the sensor base 10. Then, rotate the sensor base 10 about 10 degrees around the entrance part (11i), move the screw on the screw insertion hole 11h side relatively to the slit 11g1, and then move the screw in the direction in which the slits 11g1 and 11g2 extend. Move the sensor base 10 to Then, the necks of the two screws slide relative to each other along the slits 11g1 and 11g2, thereby setting the sensor base 10 at the normal position. In this state, the sensor base 10 is fixed to the ceiling surface by turning and tightening the two screws.

As described above, the sensor base 10 of this embodiment is constructed by attaching two screws in advance at a predetermined interval to the base installation position such as the ceiling surface, and attaching the sensor base 10 to these screws. The device is configured to be installed in a predetermined position by aligning the screw insertion hole 11h with the entrance portion (11i) and sliding it, and then tightening the screw. Therefore, work efficiency can be improved compared to an installation method in which the sensor base 10 is first joined to the base installation position and then screws are passed through the screw holes provided in the sensor base and tightened. can. In addition, if you want to replace the sensor base 10, there is no need to remove the screws, and you can simply remove the sensor base 10 and attach another sensor base by loosening it, so you can finish the work in a short time. can.

Furthermore, as shown in FIG. 1, an arc-shaped shorting piece is provided on the inner peripheral surface of the inner wall 11c between the connection terminals 12E and 12F for electrically connecting the terminals 12E and 12F. 16 are arranged so as to be slidable along the inner peripheral surface. The shorting piece 16 is formed by punching out and bending a plate-shaped metal material such as that used for a leaf spring.
Furthermore, the sensor base 10 of the present embodiment is also provided, although not particularly limited, to the inner circumferential surface of the inner wall 11c between the connecting terminals 12F and 12A, in addition to between the connecting terminals 12E and 12F. , a structure is provided for slidably arranging the shorting piece 16 along the circumferential surface. In addition, in this embodiment, when the shorting piece 16 is arranged between the connection terminals 12F and 12A, the shorting piece 16 is not arranged between the connection terminals 12E and 12F.

5A and 5B show the detailed shape of the shorting piece 16, and FIGS. 6A and 6B show the state in which the shorting piece 16 is arranged on the inner periphery of the inner wall 11c, and the shorting piece 16 and the connecting terminals 12E and 12F. 6C shows an example of a structure for preventing the short-circuiting piece 16 from coming off.
As shown in FIG. 5, the short-circuiting piece 16 includes a main body 16a shaped like an oblong plate, contact parts 16b provided at both ends of the main body 16a, and contact parts 16b located a little apart from the center of the upper side of the main body 16a. The bent piece 16c protrudes upward from the position and then bends inward, and the bent piece 16c protrudes upward from a position a little away from the center of the upper side of the main body 16a in the opposite direction to the above, and then bends inward, with the tip pointing downward. It is provided with a bent bending piece 16d. Note that the bent piece 16d is formed to have a lower height than the bent piece 16c.

Further, the main body portion 16a of the shorting piece 16 has a rectangular shape, and a slit 16e elongated in the direction of movement is formed in the main body portion 16a, with which a later-described retaining piece 11j (see FIG. 6C) engages. The contact portions 16b at both ends of the main body portion 16a are a pair of elongated plate-shaped pieces extending to both sides, and are curved so that some portions approach each other, and the distance between the closest portions is equal to the distance between the connecting terminals 12A to 12F. It is formed to be smaller than the thickness. The connection terminals 12A to 12F can pass between the contact portions 16b from one side to the other when the shorting piece 16 is moved in the longitudinal direction.
Furthermore, a pair of protrusions 16f, which are deformed with a punch, are formed on the outer surface of both ends of the main body portion 16a.

FIG. 6A shows a state in which the shorting piece 16 is disposed between two connection terminals 12E and 12F. In the state shown in FIG. 6A, the contact portion 16b of the short-circuiting piece 16 is detached from the connection terminal 12E and is not in contact with it, so there is no electrical continuity between the connection terminals 12E and 12F. When the shorting piece 16 is slid toward the connection terminal 12E from this state, the contact portions 16b at both ends of the shorting piece 16 sandwich the ends of the connection terminals 12E and 12F from above and below, as shown in FIG. 6B. Therefore, the connection terminals 12E and 12F are electrically connected.
Note that the contact portions 16b at both ends of the short-circuiting piece 16 slide while being in contact with the surfaces of the connecting terminals 12E and 12F, which can be expected to have a cleaning effect on the contact surfaces and maintain a good electrical contact state. .

As shown in FIG. 6A, the sensor base 10 has an outer portion at the upper end between the connection terminals 12E and 12F, and as shown in FIG. 6C, between the inner wall 11c and the terminal support rib 11e. A retaining piece 11j having oriented claws is erected upward from the bottom plate 11a. The shorting piece 16 is disposed along the inner circumferential surface of the inner wall 11c with the central slit 16e engaged with the claw of the retaining piece 11j.
Therefore, even if the sensor base 10 is turned upside down or subjected to an impact, the shorting piece 16 will be held so that it will not fall out from inside the sensor base 10. Moreover, since the pair of protrusions 16f formed on the outer surfaces of both ends of the main body portion 16a act to press the entire shorting piece 16 inward, the retaining piece 11j firmly enters the slit 16e. , the engagement between the shorting piece 16 and the retaining piece 11j becomes difficult to disengage.

Further, in this embodiment, as shown in FIG. 6A, a predetermined portion of the inner circumferential surface of the inner wall 11c has a width that is approximately the same as the diameter of the protrusion 16f, and increases in width as it goes upward. A guide groove 11k is provided. As a result, when inserting the shorting piece 16 inside the inner wall 11c, by aligning the protrusion 16f with the upper part of the guide groove 11k and pushing it downward, the shorting piece 16 is positioned at a predetermined mounting position and stored. become. That is, the protrusion 16f has a function of guiding the shorting piece 16 during insertion and a function of pressing the shorting piece 16 inward after insertion.

Further, a groove 11m slightly wider than the width of the retaining piece 11j is formed in a portion of the inner peripheral surface of the inner wall 11c that faces the retaining piece 11j. Due to the formation of this groove 11m, by inserting the tip of a tool such as a flathead screwdriver between the shorting piece 16 and the retaining piece 11j, hooking it on the slit 16e and lifting it, the shorting piece 16 can be removed from the inner wall 11c. can be easily removed from the inside. Further, although not shown, a guide groove of a predetermined length is formed at the base of the inner wall 11c, with which the lower edge of the shorting piece 16 engages, and this guide groove limits the slidable range of the shorting piece 16. is configured to do so.

Next, the function of the bent pieces 16c and 16d provided on the shorting piece 16 and the reason why the heights of the bent pieces 16c and 16d are changed will be explained.
7A and 7B show the structure of the bent pieces 16c and 16d of the shorting piece 16 and the bottom surface of the sensor. In FIGS. 7A and 7B, the reference numeral 21 indicates a part of the circular bottom plate of the main body case of the sensor that is coupled to the sensor base of the above embodiment. A portion of the bottom plate 21 that faces the shorting piece 16 and is located between the bent pieces 16c and 16d of the shorting piece 16 when the main body case of the sensor is coupled to the sensor base is provided with a A protrusion 21a having an inverted L shape is formed.

The height of the protrusion 21a is set so that its tip (lower end in FIGS. 7A and 7B) reaches a position where it intersects the bent pieces 16c and 16d of the shorting piece 16. As a result, when the bottom plate 21 is moved (rotated) to the right in FIG. 7A, the side portion of the tip of the protrusion 21a comes into contact with the bending piece 16c, and the shorting piece 16 moves together. On the other hand, when the bottom plate 21 is moved (rotated) to the left, as shown in FIG. 7B, the side of the tip of the protrusion 21a comes into contact with the bent piece 16d, and the shorting piece 16 moves together. I will do it.
The reason why the protrusion 21a is shaped like an inverted L is to increase the strength against bending stress generated at the base of the protrusion 21a when force is applied to the tip of the protrusion 21a. Therefore, the shape of the protrusion 21a is not limited to an inverted L shape when viewed from the side, but may be a rectangular shape in which the tip has the same width as the base side, that is, the entire protrusion 21a may be a rectangular parallelepiped.

In this embodiment, when the main body case of the sensor is coupled to the sensor base 10 and when the two are separated, the main case of the sensor is rotated by a predetermined angle (approximately 10°) in the circumferential direction. It is structured to be carried out. Therefore, in order to connect the main body case of the sensor to the sensor base 10, the main case of the sensor is aligned with the sensor base 10 at a predetermined angle and fitted, and then the main case is rotated. When the shorting piece 16 is rotated, the shorting piece 16 is moved. Then, as shown in FIG. 6A, the contact portion 16b of the shorting piece 16 comes off from the connection terminals 12E and 12F, and the connection terminals 12E and 12F are set to be electrically non-conductive.

On the other hand, when the main body case of the sensor is rotated in the opposite direction to that described above in order to separate the main body case of the sensor from the sensor base 10, the shorting piece 16 is moved by the rotating operation. Then, as shown in FIG. 6B, the contact portion 16b of the short-circuiting piece 16 sandwiches and contacts the connection terminals 12E and 12F, thereby establishing electrical continuity between the connection terminals 12E and 12F. Ru. By reversing the positional relationship between the bent pieces 16c and 16d, the direction of rotation of the main body case of the sensor and the setting of the non-conducting state or the conducting state can be reversed from the above. It is also possible to do so.

In FIGS. 8A and 8B, the height of the protrusion 21a is lower than that in FIGS. 7A and 7B, and although the tip of the protrusion 21a intersects with the bent piece 16c of the shorting piece 16, it also intersects with the bent piece 16d. shows the relationship between the protrusion 21a and the bent pieces 16c, 16d of the shorting piece 16 when the heights are set so that they do not intersect.
When the height of the protrusion 21a is set as described above, when the main body case of the sensor is rotated with respect to the sensor base 10 in order to connect the main body case of the sensor to the sensor base 10, the rotation operation is performed. As a result, as shown in FIG. 8A, the protrusion 21a comes into contact with the bent piece 16c, and the shorting piece 16 is moved together. Then, as shown in FIG. 6A, the contact portion 16b of the shorting piece 16 comes off from the connection terminals 12E and 12F, and the connection terminals 12E and 12F are set to be electrically non-conductive.

On the other hand, when the main body case of the sensor is rotated in the opposite direction to that described above in order to separate the main body case of the sensor from the sensor base 10, the shorting piece 16 is moved by the rotating operation. Then, as shown in FIG. 8B, the protrusion 21a passes over the bent piece 16d without contacting it, and the shorting piece 16 is not moved. Therefore, the contact portion 16b of the shorting piece 16 remains disconnected from the connection terminals 12E and 12F, and the connection terminals 12E and 12F are maintained in an electrically non-conductive state.

Since the sensor base 10 of this embodiment has the above-mentioned functions, depending on the type of sensor, a tall protrusion 21a may be provided at the bottom of the main body case of the sensor, or a high protrusion 21a may be provided at the bottom of the main body case of the sensor. By selectively forming the low protrusion 21a, it is possible to change the electrical connection state (conducting state or non-conducting state) between the connection terminals 12E-12F after the sensor is removed from the sensor base 10. It has the advantage of being possible.

FIG. 9A shows the configuration of the bottom part of the main body case of a so-called conventional sensor used in a system that monitors a plurality of sensors for each sensor line. Further, FIG. 9B shows the configuration of the bottom part of the main body case of a sensor called an analog type used in a system in which multiple sensors connected to one sensor line are managed by individual addresses. .

As shown in FIGS. 9A and 9B, external terminals connected to the connection terminals 12A to 12F provided on the sensor base 10 of the above embodiment are provided on the bottom plate 21 of the main body case 20 of each sensor. 22A to 22F are provided. The external terminals 22A to 22F are equipped with an inner terminal and an outer terminal having contact pieces bent toward each other, and are arranged so that the contact pieces overlap each other, and there is a By inserting the connection terminals 12E to 12F of the sensor base 10, the sensor and the corresponding terminals of the sensor base are electrically connected.

Further, a peripheral wall portion 23 is provided at the peripheral edge of the bottom plate 21 and fits into the gap between the outer peripheral wall 11b and the inner wall 11c at the peripheral edge of the sensor base 10. By fitting into the gap between the wall 11b and the inner wall 11c and rotating the external terminals 22A to 22F, the external terminals 22A to 22F enter between the connecting terminals 12E to 12F and the bottom plate 11a, and the sensor is coupled to the sensor base. At the same time, the corresponding terminals are electrically connected.
In addition, in the sensor base 10 to which the analog type sensor of FIG. 9B is coupled, as shown in FIG. In the sensor base 10 to be coupled, a shorting piece 16 is disposed between the connection terminals 12F and 12A in FIG.

The bottom plate 21 of the main body case 20 shown in FIG. 9A is provided with a protrusion 21a having a low height near the external terminal 22A (first terminal). A tall protrusion 21a is provided near the external terminal 22F (sixth terminal). Therefore, no matter which sensor is connected to the sensor base 10, when the main body case 20 of the sensor is turned for connection, as shown in FIG. 6A, the contact portion 16b is connected to the connection terminal 12F. , 12A or 12E, 12F, and the connection terminals 12F-12A or 12E-12F are electrically disconnected.
When this sensor is coupled to the sensor base 10, the connection is made by wiring within the sensor, so the sensor line will not be disconnected.

When separating the sensor from the sensor base 10, the sensor shown in FIG. 9A (conventional type sensor) provided with a low protrusion 21a is separated from the sensor base 10. When rotated, the protrusion 21a passes over the bent piece 16d without contacting it, so the shorting piece 16 is not moved and the contact portion 16b of the shorting piece 16 remains detached from the connecting terminals 12F, 12A. , the connection terminals 12F and 12A are maintained in an electrically non-conductive state.
In the sensor shown in FIG. 9A (conventional type sensor), the connection terminal 12F is a negative power input terminal, and the connection terminal 12A is a negative power output terminal. Therefore, when the connection terminals 12F and 12A are electrically disconnected, the voltage of the line to which the sensor base 10 is connected can be measured to determine that the sensor is disconnected (the sensor line It is possible to discover that the wire is disconnected.

On the other hand, when the sensor shown in FIG. 9B (analog sensor) provided with the tall protrusion 21a is rotated to separate it from the sensor base 10, the protrusion 21a is attached to the bent piece 16d. In order to make contact and move the shorting piece 16, the contact portion 16b of the shorting piece 16 comes into contact with the connection terminals 12E and 12F, and the connection terminals 12E and 12F return to an electrically conductive state.
In the sensor (analog type sensor) shown in FIG. 9B, the connection terminal 12F is a negative power input terminal, and the connection terminal 12E is a negative power output terminal. Therefore, by establishing electrical continuity between the connection terminals 12E and 12F, power is transmitted to other adjacent sensors, and even if a sensor is removed from one of the sensor bases 10, the remaining If the sensor operates normally and detects an abnormality, the receiver can detect the occurrence of the abnormality via the sensor line.

Here, examples of uses of connection terminals 12B to 12E or 12A to 12D other than connection terminals 12F, 12A or 12E, 12F used as negative power input terminals or negative power output terminals are shown in List 1 and List below. 2 shows each. Among them, List 1 shows an example of terminal use of a conventional type sensor in which the connection terminals 12F and 12A are used as a negative power input terminal and a negative power output terminal. Moreover, List 2 shows an example of terminal use of an analog type sensor in which the connection terminals 12E and 12F are used as a negative power input terminal and a negative power output terminal.

List 1 (Example of use of conventional type sensor)
Terminal 1: Output terminal for negative (-) power supply Terminal 2: Unused Terminal 3: Input/output terminal for positive (+) power supply Terminal 4: Unused Terminal 5: Control terminal for external indicator light Terminal 6: Negative (-) power supply Input terminal list 2 (example of use of analog type sensor)
Terminal 1: Input/output terminal for positive (+) power supply Terminal 2: Relay control terminal Terminal 3: Control terminal for external indicator light Terminal 4: Unused Terminal 5: Output terminal for negative (-) power supply Terminal 6: Negative (-) ) Power supply input terminal Note that the usage examples shown in the above list are just examples, and are not limited to these.
For example, the number of terminals on the sensor and the sensor base may be different.
Specifically, in the above List 2 (example of use of an analog sensor), the terminal 4 on the sensor side is unused, and the number of parts can be reduced by not providing a terminal fitting.

As explained above, according to the sensing device including the sensor base 10 and the sensor having the protrusion 21a of the present embodiment, the height of the protrusion 21a provided on the bottom plate 21 of the sensor is determined by the type (type) of the sensor. ). Due to the difference in height of the protrusion 21a corresponding to the type of sensor, when the sensor is removed from the sensor base 10, the difference between the pair of negative power input/output terminals (terminals of the same polarity) of the sensor base 10 The electrical conduction state can be set to conduction or non-conduction in conjunction with the removal of the sensor.
Furthermore, by providing multiple locations on the sensor base 10 where the shorting pieces 16 can be installed, parts can be easily attached to the sensor base used in a detection system to which different types of sensors are connected. Standardization can be achieved and costs can be reduced. Furthermore, by not providing the shorting piece 16 in the sensor base, it can also be used as a sensor base for connecting a sensor that does not have the protrusion 21a.

10A and 10B show a specific example of the terminal number display portion provided on the base body 11 of the sensor base 10 of this embodiment.
In the sensor base of this embodiment, numbers representing terminal numbers are written as hollow numbers penetrating the bottom plate 11a near the connection terminals 12A to 12F on the bottom plate 11a of the base body 11. FIG. 10A shows a terminal number "2" written near the connection terminal 12B. Further, as shown in the figure, hollow numbers representing terminal numbers are formed on a stepped portion 11n provided on the bottom plate 11a.

Some conventional products also have numbers representing the terminal numbers written near the connection terminals 12A to 12F, but these were generally written as raised numbers. The disadvantage is that it is difficult to read because it is the same color as the main body. Therefore, it is possible to color the surface of the embossed numbers in a color different from the color of the base body, but this increases the number of steps and increases the cost. On the other hand, if the numbers are written as hollow numbers as described above, the numbers can be written at the same time when the sensor base is formed from synthetic resin, thereby reducing costs.

Furthermore, although FIG. 10A shows the lower surface when the sensor base is installed on the ceiling surface, if the number representing the terminal number is a hollow number penetrating the bottom plate 11a, the base body 11 If water from condensation enters the upper surface through the ceiling surface, there is a risk that the water will flow down from the hollow numerals to the sensor below, reducing the sensor's functionality. Moreover, simply providing hollow numbers on the bottom plate 11a does not stabilize the area on which water drops fall.

On the other hand, if hollow numbers representing terminal numbers are formed on the stepped portion 11n as described above, the area where water flows down to the sensor can be limited to the edge of the stepped portion 11n. Therefore, for example, by providing a drain hole in a portion of the sensor case corresponding to the stepped portion 11n and quickly draining the water that has entered, it is possible to prevent the function of the sensor from deteriorating.
Furthermore, in the sensor base of this embodiment, as shown in FIG. 10B, which shows the surface of the base body 11 opposite to FIG. 10A, ribs 11p are formed around the hollow numerals. Therefore, the ribs 11p can stop water that has entered the upper surface of the base body 11 from the ceiling, and can prevent water from flowing down from the penetrating portion of the hollow numerals to the sensor below.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the gist thereof. For example, in the above embodiment, six connection terminals are provided on the sensor base, but the number of connection terminals is not limited to six.
Further, in the above embodiment, when setting a pair of negative power input/output terminals (terminals of the same polarity) to a non-conducting state, the contact portions 16b at both ends of the shorting piece 16 are separated from the corresponding connection terminals almost simultaneously. However, only one of the contact portions 16b may be separated from the corresponding connection terminal.

Furthermore, in the above embodiment, the shorting piece 16 is configured to move along the inner circumferential surface of the inner wall 11c of the base body 11, but a guide member for the shorting piece 16 is provided on the base body 11. , the shorting piece 16 may be configured to move linearly.
Further, in the above embodiment, the bent pieces 16c and 16d of different heights are provided on the upper part of the shorting piece 16, but two bent pieces of different heights are provided on the side surface of the shorting piece 16 in the horizontal direction, The main body case of the sensor may be provided with protrusions 21a having different lengths in the horizontal direction and can intersect with at least one of the bent pieces.
Further, in the above embodiment, a double wall structure is shown in which an outer peripheral wall and an inner wall are provided along the peripheral edge of the bottom plate of the sensor base, but a structure in which one peripheral wall is formed is shown. Also good.

INDUSTRIAL APPLICATION This invention is not limited to the sensor which detects a flame, but can be utilized for the sensor base and sensing device for attaching to a building a sensor that detects harmful gas and other sensors.

10 Sensor base 11 Base body 11a Bottom plate 11b Outer wall 11c Inner wall 11e Terminal support rib 11j Locking pieces 12A to 12F Connection terminals 13A to 13F Fixing screws 14A to 14F Wiring connection screws 15A to 15F Safety washer 16 Shorting piece 16a Main body part 16b Contact part 16c Bending piece 16d Bending piece 16e Guide slit 16f Projection part 20 Sensor main body case 21 Bottom plate 21a Protrusion 22A to 22F External terminal 23 Surrounding wall part

Claims (9)

A bottom plate having a circular shape, a peripheral wall provided along a peripheral edge of the bottom plate, and a plurality of connection terminals arranged on the bottom plate at predetermined intervals in a circumferential direction, A sensor base configured to be able to attach a sensor having a plurality of external terminals that can be contacted with each of the connection terminals of the sensor base,
A shorting member is provided between any two of the plurality of connection terminals, the shorting member having a pair of contact portions at both ends capable of contacting the two connection terminals, respectively, and disposed so as to be movable back and forth in a predetermined direction;
The short circuit member is provided with two protrusions having different heights,
When the shorting member is moved to one side of the movement range by a force acting on one of the two protrusions, the contact parts at both ends are brought into contact with the corresponding two connection terminals,
When the shorting member is moved to the other side of the movement range by a force acting on the other of the two protrusions, at least one of the contact parts at both ends is separated from the corresponding connection terminal. A sensor base comprising: The shorting member is provided with two protrusions having different heights from the surface of the bottom plate,
The sensor base according to claim 1, further comprising a guide structure provided inside the peripheral wall to guide the shorting member. The peripheral wall is an outer peripheral wall and an inner wall formed inside the outer peripheral wall with a predetermined interval,
Each of the plurality of connection terminals extends close to the inner wall,
3. The sensor base according to claim 2, wherein the shorting member has an arc shape and is movably disposed along the inner peripheral surface of the inner wall. The short-circuiting member has a main body in the form of a strip, and the main body has an elongated slit in the direction of movement,
4. The sensor base according to claim 3, wherein a locking piece having a claw that can be engaged with the slit is provided on the bottom plate in parallel with the main body. The locking piece is formed such that the claw faces the inner circumferential surface of the inner wall,
5. The sensor base according to claim 4, wherein a side surface of the short-circuiting member is provided with a protrusion that contacts an inner circumferential surface of the inner wall. 6. A groove is formed at a predetermined position on the inner circumferential surface of the inner wall so that the protrusion on the side surface of the short-circuiting member can be guided in the height direction of the inner wall. sensor base. A plurality of the guide structures are provided inside the inner wall so as to correspond between different connection terminals, and the shorting member is selectively disposed on any one of the plurality of guide structures. The sensor base according to any one of claims 3 to 6. The connection terminal is made of a plate-shaped conductive material,
The sensor base according to any one of claims 1 to 7, wherein the contact portions at both ends of the short-circuiting member are formed by a pair of curved pieces that respectively sandwich and contact the connection terminal from above and below. . A sensing device comprising a sensor base according to any one of claims 1 to 8 and a sensor coupled to the sensor base,
The bottom surface of the case of the sensor includes a plurality of external terminals that can contact each of the plurality of connection terminals, and a sensor and a sensor base that are located between the two protrusions facing the short circuit member. A sensing device comprising a protrusion having a height that can interfere with at least one of the two protrusions when rotated in a fitted state.

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