JP2008077473A - Smoke sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a smoke sensor, capable of maintaining a state where smoke is easy to flow to a fire detection part even in a dusty environment. <P>SOLUTION: The smoke sensor 1 including the fire detection part 10 which detects occurrence of a fire by detecting a change in concentration of smoke and a mesh body 11 permitting passage of smoke to the fire detection part comprises a motor 15 and a gear 14 for sliding the mesh body 11. The mesh body 11 can be slid by operating the motor 15 and the gear 14. Therefore, since a portion located closer to a ceiling side where dust is easy to accumulate of each portion of the outer circumferential surface of the mesh body 11 can be moved, accumulation of dust to only a specific portion of the outer circumferential surface can be prevented. Consequently, even if the smoke sensor 1 set in a dusty environment, the passage of smoke to the mesh body 11 is never disturbed by dust, and the state where smoke is easy to flow to the detection part 10 can be maintained for a long period. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a smoke detector that detects the occurrence of a fire with smoke.

  Conventionally, in order to detect the occurrence of a fire, a fire detector that detects smoke, heat, flame, etc. resulting from the fire has been used. Among these fire detectors, a detector that detects a fire from a change in the concentration of smoke in the air is called a smoke detector. There are two types of smoke detectors with different detection principles of smoke concentration change. Those using light scattering by smoke are photoelectric smoke detectors, and the current-carrying characteristics in ionized air change due to smoke. Those that utilize this property are called ionization smoke detectors. Each of these types of smoke detectors is provided with a fire detector inside, and is configured to detect smoke flowing into the fire detector.

  Here, when a foreign matter such as a small insect enters the fire detection unit of such a smoke detector, the detector may malfunction due to the foreign matter. Therefore, in order to prevent such a malfunction, a net body for preventing entry of a foreign matter such as a small insect is installed in the smoke inflow path to the fire detection unit (see, for example, Patent Document 1). .

JP 2006-48191 A

  By the way, not only large-scale buildings such as factory facilities and high-rise buildings, but also in recent years, installation of fire detectors has become mandatory even in ordinary houses, and smoke detectors are recommended as fire detectors for houses. ing. However, while houses have many sources of dust such as clothes and carpets, smoke detectors are installed at high places near the ceiling, making it difficult to clean the detectors and making it easy for dust to accumulate on the detectors. is there. In particular, smoke detectors of the type installed on the wall have a smoke inlet on the ceiling side of the detector in order to make it easier to take in smoke that gradually descends along the wall. Dust easily enters the sensor from the inlet. When the dust that has entered in this way accumulates on the foreign body intrusion prevention network installed on the smoke inflow path, it prevents the inflow of smoke to the fire detection unit in the event of a fire and reduces the responsiveness of the fire detector. There was a possibility.

  The present invention has been made in view of the above, and an object of the present invention is to provide a smoke detector capable of maintaining a state in which smoke easily flows into a fire detection unit even in a dusty environment.

  In order to solve the above-described problems and achieve the object, the smoke sensor according to claim 1 detects a fire occurrence by detecting a change in smoke concentration, to the fire detection means. The smoke detector is provided in a smoke inflow passage and has a mesh body that allows smoke to pass through the fire detection means, and includes a sliding means for sliding the mesh body.

  The smoke detector according to claim 2 is the smoke detector according to claim 1, wherein the sliding means transmits a rotation of the motor to a motor and the net, And a gear meshing with the net body.

  The smoke detector according to claim 3 is provided with control means for performing an operation relating to fire detection in the smoke detector according to claim 1 or 2, wherein the control means intermittently turns on the fire detection means. It is activated, and comprises activation control means for activating the sliding means together with activation of the fire detection means.

  According to a fourth aspect of the present invention, there is provided the smoke detector according to any one of the first to third aspects, further comprising an inspection operation instruction means for instructing the smoke detector to perform an inspection operation. And the sliding means can be activated based on an operation on the inspection operation instruction means.

  Further, the smoke detector according to claim 5 is the smoke detector according to any one of claims 1 to 4, wherein the smoke detector is installed in the vicinity of the mesh body, and the smoke sensor is moved along with the sliding of the mesh body. A removing means for removing the deposits on the net is provided.

  Moreover, the smoke detector according to claim 6 is the smoke detector according to any one of claims 1 to 5, wherein the smoke detector generates an air current in the vicinity of the mesh body by sliding of the mesh body. Is provided on the mesh body.

  The smoke detector according to claim 7 is characterized in that, in the smoke detector according to claim 6, the air flow generation means is formed so as to generate an air flow toward the inside of the fire detection means. And

  Further, the smoke detector according to claim 8 is the smoke detector according to claim 6 or 7, wherein the air flow generation means is formed so that an air flow directed to the outside of the fire detection means is generated. It is characterized by.

  According to this invention, the net body can be slid by operating the sliding means. Accordingly, among the portions of the outer peripheral surface of the net body, the portion located on the ceiling side where dust is likely to accumulate can be moved, so that dust can be prevented from accumulating only on a specific portion of the outer peripheral surface. Even when dust accumulates on the net, it can be removed by moving the dust to the side or downward and dropping it by its own weight. As a result, even if a smoke detector is installed in a dusty environment, the dust does not block the passage of smoke to the mesh body, so that a state in which smoke tends to flow into the fire detection means can be maintained for a long time. it can.

  Further, according to the present invention, the gear is arranged so that the gear teeth and the holes constituting the mesh of the mesh body mesh with each other, and the rotation of the motor is transmitted to the mesh body through the gear. The body can be slid. In particular, the transmission mechanism for the rotational power can be easily configured by directly engaging the gear with the mesh body.

  According to the present invention, the control means includes the activation control means, and the fire detection means and / or the sliding means can be activated intermittently. Therefore, the mesh body can be slid intermittently, and power consumption required for the operation of the sliding means can be suppressed.

  Further, according to the present invention, since the activation control means activates the sliding means based on the operation on the inspection operation instruction means, the network body can be slid at any time by operating the inspection operation instruction means. it can. Therefore, by periodically inspecting the smoke detector, the inspector can periodically slide the mesh body without being aware of it. Further, by operating the inspection operation instruction means, the net body can be intentionally and easily slid.

  Further, according to the present invention, since the removing means for removing the dust is provided in the vicinity of the net body, in addition to the dust removing action obtained by sliding the net body, The action of removing the dust by contact of the removing means can be obtained, and the dust removing performance can be further improved. Accordingly, even with a smoke detector installed in a place with a lot of oil such as a kitchen, it is possible to more reliably remove dust having increased adhesion due to adhesion of oil.

  Further, according to the present invention, since the air flow generating means is provided on the mesh body, the air current can be generated near the mesh body by sliding the mesh body, and the air current generated outside the mesh body. The dust attached to the mesh body can be removed outside the mesh body, or the dust attached to the mesh body is blown out toward the outside of the mesh body by the gas flowing from the inside to the outside of the mesh body. Therefore, dust can be removed using gas as a medium without friction and wear, and a dust removal structure that is stable over a long period of time can be constructed. Further, the gas flowing from the outside to the inside of the mesh body can promote the inflow of smoke to the fire detection means, and the responsiveness of the smoke detector can be improved.

  Further, according to the present invention, since the airflow generating means for generating the airflow toward the inside of the fire detection means is provided on the net body, the airflow from the outside of the net body to the inside is generated by sliding the net body. And the inflow of smoke to the fire detection means can be promoted by the airflow. Therefore, by performing a single operation of sliding the mesh body, it is possible to obtain a dust removing action and at the same time improve the responsiveness of the smoke detector.

  Further, according to the present invention, since the air flow generating means for generating the air flow directed to the outside of the fire detecting means is provided on the net body, the air flow from the inside of the net body to the outside is generated by sliding the net body. The dust accumulated on the mesh body can be blown out to the outside of the mesh body by the air flow, and the dust can be more reliably removed.

  Hereinafter, embodiments of a smoke detector according to the present invention will be described in detail with reference to the accompanying drawings. [I] First, the basic concept common to each embodiment was explained, then [II] the specific contents of each embodiment were explained, and [III] Finally, modifications to each embodiment were explained. To do. However, the present invention is not limited to each embodiment.

[I] Basic concept common to the embodiments First, the basic concept of the embodiment will be described. The smoke detector according to the present embodiment is for detecting the occurrence of a fire from a change in the concentration of smoke in the air.

  The present invention can be applied to any type of smoke detectors including photoelectric smoke detectors and ionization smoke detectors. In the following embodiments, the present invention is applied to photoelectric smoke detectors. Will be described. Moreover, the installation location of the smoke detector according to the present embodiment is arbitrary, and for example, it can be installed in a large-scale building such as a factory facility or a building, or in a room such as a kitchen or a bedroom of a general house.

  Here, one of the features of the smoke detector according to the present embodiment is that the net installed in the fire detection unit is not completely fixed, and sliding is possible while maintaining hermeticity against foreign matter. In the point. Therefore, among the portions of the outer peripheral surface of the net body, the portion located on the ceiling side where dust is likely to accumulate can be moved, so that it is possible to prevent dust from accumulating only on specific portions of the outer peripheral surface. Even when dust accumulates on the net, it can be removed by moving the dust to the side or downward and dropping it by its own weight. As a result, even if a smoke detector is installed in a dusty environment, the dust does not interfere with the passage of smoke to the mesh body. it can.

[II] Specific Contents of Embodiment Next, specific contents of each embodiment according to the present invention will be described.

[Embodiment 1]
First, the first embodiment will be described. This form is a basic form that allows the net to slide.

  1 is an external perspective view of the smoke detector according to the first embodiment, FIG. 2 is an internal perspective view of the smoke detector shown in FIG. 1 (partially cut away), and FIG. 3 is an electrical view of the smoke detector. FIG.

  As shown in FIG. 1, the smoke detector 1 has a housing 2 serving as a basic structure, and a part of the housing 2 is detachable. The casing 2 is provided with a plurality of smoke inlets 3 for allowing smoke to flow into the smoke detector 1. In addition, the material of the housing | casing 2 is arbitrary and is formed from resin, for example. Further, as shown in FIG. 2, a fire detection unit 10, a control unit 20, and an inspection switch 30 are accommodated in the housing 2.

  The fire detection unit 10 is for detecting the occurrence of a fire from the change in the concentration of smoke in the air, and corresponds to the fire detection means in the claims. The fire detection unit 10 includes a detection space surrounded by a net 11 and includes a labyrinth 13, an infrared LED (not shown), and a photodiode (not shown) inside the fire detection unit 10. The labyrinth 13 is a plurality of walls that suppress the generation and intrusion of noise light to the fire detection unit 10 and allow the passage of smoke. The infrared LED is a light emitting element that emits detection light, and the photodiode is a light receiving element that receives the detection light. The net body 11 will be described later.

  In such a configuration, when smoke enters the fire detection unit 10 through the smoke inlet 3 of the housing 2, the detection light emitted from the infrared LED is caused by smoke particles that have passed through the net body 11 and the labyrinth 13. The amount of light incident on the photodiode is changed by being scattered. Then, a current or voltage detection signal corresponding to the amount of received light is output from the photodiode to the control unit 20, and a fire determination is performed in the control unit 20.

  The control unit 20 is for performing an operation related to detection of fire occurrence in the smoke detector 1, and corresponds to the control means in the claims. The specific configuration of the control unit 20 is arbitrary. For example, the control unit 20 includes a control program such as an OS (Operating System), a program that defines various processing procedures, and an internal memory for storing necessary data. A CPU (Central Processing Unit) for executing these programs can be provided. In terms of functional concept, the control unit 20 includes a detection processing unit 21 as shown in FIG. The detection processing unit 21 is a processing unit that determines whether or not a fire has occurred based on a detection signal input from the fire detection unit 10.

  The inspection switch 30 is means for starting a predetermined operation in the smoke detector 1 and corresponds to inspection operation instruction means in the claims. Specifically, when the inspection switch 30 is pressed, the operation is detected by the control unit 20, and a predetermined inspection operation is started. As shown in FIG. 1, there are two types of pressing means for pressing the inspection switch 30: an operation button 31 provided on the housing 2 and an operation string 32 drawn out of the housing 2. Is provided. Then, by pressing the operation button 31 from the outside of the housing 2 or pulling the operation string 32, the inspection switch 30 is indirectly pressed, and the inspection operation can be started.

  As shown in FIG. 2, the fire detection unit 10 includes the net body 11 as described above, and a gear 14 and a motor 15 are disposed in the vicinity of the net body 11. FIG. 4 is a cross-sectional view showing the attachment portion of the net body 11 in the fire detection unit 10, and FIG. 5 is a cross-sectional view showing the positional relationship between the net body 11 and the gear 14.

  The net 11 is for preventing the entry of foreign matter such as small insects into the inside of the fire detection unit 10, and is installed on the smoke inflow path to the fire detection unit 10. Specifically, as shown in FIG. 4, the net body 11 is fitted in the groove 12 provided in the fire detection unit 10, so that the entry of foreign matter into the fire detection unit 10 is blocked. Further, the net 11 is fixed so as to be slidable in the direction of the groove 12, and the net 11 can be slid by a motor 15 and a gear 14 which will be described later. In addition, the material which comprises the net | network body 11 is arbitrary, for example, is comprised from the metal thin plate which gave the fine hole by performing an etching process.

  The motor 15 and the gear 14 are means for sliding the mesh body 11 and correspond to the sliding means in the claims. Specifically, as shown in FIG. 5, the gear 14 is arranged so that the teeth 14 a of the gear 14 mesh with the holes 11 a constituting the mesh of the mesh body 11, and the rotation of the motor 15 is performed via the gear 14. By being transmitted to the net body 11, the net body 11 can be directly slid by the gear 14. The configuration of the power source that supplies power to the motor 15 is arbitrary, and includes, for example, a battery built in the smoke detector 1 or an external power source connected via an outlet. The operation timing of the motor 15 is arbitrary, and for example, the motor 15 can be operated continuously or periodically. For example, when the power source is an external power source, since there are few restrictions on power consumption, power is continuously supplied from the external power source to the motor 15 and the motor 15 is continuously operated, so that the network body 11 is continuously operated. Can be slid.

(Effect of Embodiment 1)
Thus, according to the first embodiment, the net body 11 can be slid by operating the motor 15. Therefore, among the portions of the outer peripheral surface of the net 11, the portion located on the ceiling side where dust is likely to accumulate can be moved, so that dust can be prevented from accumulating only on specific portions of the outer peripheral surface. Alternatively, even when dust locally accumulates, the dust can be dropped by moving the dust to the side or the lower side of the net body 11 to remove the dust. Therefore, even if the smoke detector 1 is installed in a dusty environment, the dust does not interfere with the passage of smoke to the net body 11, so that a state in which smoke easily flows into the fire detection unit 10 is maintained for a long time. And the responsiveness of the smoke detector 1 can be maintained at a high level over a long period of time.

[Embodiment 2]
Next, a second embodiment will be described. This form is a form in which sliding of the mesh body is performed intermittently.

  FIG. 6 is a block diagram conceptually showing an electrical configuration of the smoke detector according to the second embodiment, and FIG. 7 is a time chart showing a start / stop cycle of the detection processing unit and the motor. The configuration of the second embodiment is substantially the same as the configuration of the first embodiment except where otherwise specified, and the same configuration as that of the first embodiment is used in the first embodiment. The same reference numerals and / or names are attached as necessary, and the description thereof is omitted.

  In the second embodiment, it is assumed that power is supplied to the smoke detector 1 by a battery built in the smoke detector 1. In this case, since the capacity of the built-in battery is limited, it is preferable to suppress the power consumption of the smoke detector 1. Therefore, in the conventional smoke detector with a built-in battery, the power consumption is suppressed by repeating the start / stop cycle of the detection processing unit in the control unit and performing the fire detection operation intermittently.

  Here, in the second embodiment, as shown in FIG. 6, the control unit 20 includes an activation control unit 22 in terms of functional concept. The activation control unit 22 is a control unit for performing activation control of the detection processing unit 21 and the motor 15, and corresponds to activation control means in the claims. The activation control unit 22 operates the detection processing unit 21 and the motor 15 intermittently. Specifically, as shown in FIG. 7, the activation control unit 22 stops the detection processing unit 21 after operating for a predetermined time t1, and again after maintaining the stopped state for the predetermined time t2. Start. Further, the activation control unit 22 activates the motor 15 substantially simultaneously when activating the detection processing unit 21, operates the motor 15 for a predetermined number of revolutions or for a predetermined time, and then stops the motor 15. The motor 15 can be operated intermittently by repeating the above cycle.

(Effect of Embodiment 2)
As described above, according to the second embodiment, since the control unit 20 includes the activation control unit 22, the detection processing unit 21 and / or the motor 15 can be operated intermittently. Therefore, the net body 11 can be slid intermittently, and the power consumption required for the operation of the motor 15 can be suppressed.

[Embodiment 3]
Next, Embodiment 3 will be described. In this form, the sliding of the mesh body can be activated by an inspection operation.

  FIG. 8 is a flowchart showing the flow of the control operation in the control unit according to the third embodiment, FIG. 9 is a flowchart showing the flow of the control operation for the motor, and FIG. 10 is a flow of the control operation when an operation is performed on the inspection switch. It is a flowchart which shows. The configuration of the third embodiment is substantially the same as the configuration of the second embodiment unless otherwise specified, and the same configuration as that of the second embodiment is used in the second embodiment. The same reference numerals and / or names are attached as necessary, and the description thereof is omitted.

  In the third embodiment, the activation control unit 22 operates the motor 15 when an operation on the inspection switch 30 is detected. First, (1) the flow of control operation when the operation on the inspection switch 30 is not performed will be described, and then (2) the flow of control operation when the operation on the inspection switch 30 is performed will be described.

(1) When operation with respect to the inspection switch 30 is not performed As shown in FIG. 8, in the control part 20, the starting control part 22 determines whether the detection process part 21 is started (step SA-1). Specifically, it is determined whether or not the stop state of the detection processing unit 21 has been maintained for a predetermined time.

  When the stop state of the detection processing unit 21 is maintained for a predetermined time (step SA-1, Yes), the activation control unit 22 activates the detection processing unit 21, and the detection processing unit 21 executes a fire detection operation ( Step SA-2).

  As a result of the fire detection operation, when a detection value indicating smoke concentration is input from the fire detection unit 10 to the detection processing unit 21, the detection processing unit 21 determines whether or not a fire has occurred (step SA-4). ). Specifically, it is determined whether or not the detected value has reached a preset smoke density.

  If no fire has occurred (step SA-4, No), the control unit 20 returns to step SA-1. On the other hand, when a fire has occurred (step SA-4, Yes), the control unit 20 executes an alarm process (step SA-5).

  In addition, the activation control unit 22 executes activation of the detection processing unit 21 in Step SA-2 and also executes activation control of the motor 15 (Step SA-3). With reference to FIG. 9, the control operation performed by the activation control unit 22 for the motor 15 will be described as a sliding control process.

  In the sliding control process, when the activation control unit 22 activates the motor 15 (step SB-1), the rotation of the motor 15 is transmitted to the mesh body 11 by the gear 14, and the mesh body 11 is slid. Then, the activation control unit 22 determines whether or not the motor 15 has operated the net body 11 for a predetermined distance (step SB-2). Specifically, when the motor 15 operates for a predetermined time or number of revolutions and moves the net body 11 for a predetermined distance (step SB-2, Yes), the activation control unit 22 stops the motor 15 (step SB). -3).

(2) When the operation on the inspection switch 30 is performed The control operation when the operation on the inspection switch 30 is performed can be started at any point in the control operation when the operation on the inspection switch 30 is not performed. It is. With reference to FIG. 10, an operation when an operation on the inspection switch 30 is performed will be described as an inspection process.

  In the inspection process, when an operation is performed on the inspection switch 30, the activation control unit 22 activates the inspection operation (step SC-1). As a result of the inspection operation, when the function of the smoke detector 1 is normal (step SC-2, Yes), the start control unit 22 executes start control of the motor 15 shown in FIG. 9 (step SC-3). . At this time, the time or the number of rotations for operating the motor 15 is arbitrary, and it is possible to set a value different from the time or the number of rotations set in the control operation when the operation on the above-described inspection switch 30 is not performed. It is. When a malfunction of the smoke detector 1 is detected (No at Step SC-2), the control unit 20 performs an abnormal output using a speaker or an indicator lamp to notify the abnormality of the smoke detector 1 (Step SC-). 4). When such an inspection operation and the operation of the motor 15 are completed, the process returns to step SA-1.

(Effect of Embodiment 3)
As described above, according to the third embodiment, the activation control unit 22 activates the motor 15 when detecting an operation on the inspection switch 30, so that the mesh body 11 is slid at an arbitrary time by operating the inspection switch 30. be able to. Therefore, by periodically inspecting the smoke detector 1, the inspector can slide the mesh body 11 periodically without being aware of it. In addition, by operating the inspection switch 30, the net body 11 can be intentionally and easily slid.

[Embodiment 4]
Next, a fourth embodiment will be described. This form is the form which provided the removal means in the net | network.

  FIG. 11 is an internal perspective view of the smoke detector according to the fourth embodiment. The configuration of the fourth embodiment is substantially the same as the configuration of the third embodiment except where otherwise specified. The same configuration as that of the third embodiment is used in the third embodiment. The same reference numerals and / or names are attached as necessary, and the description thereof is omitted.

  As shown in FIG. 11, the smoke detector 1 according to the fourth embodiment includes a brush 16 inside the housing 2. This brush 16 is a means for removing dust adhering to the net body 11, and corresponds to the removing means in the claims. Specifically, the brush 16 includes brush bristles 16a for removing dust from the net body 11, and a brush base portion 16b in which the brush bristles 16a are implanted. The brush base portion 16b is enclosed by a fixing means including a screw or an adhesive. Fixed to the body 2. The brush base portion 16b is fixed in the vicinity of the net body 11. Specifically, the brush 16 is placed in the vicinity of the mesh body 11 to such an extent that the tip of the brush hair 16a is brought into contact with the mesh body 11, or at least the tip of the brush hair 16a can be brought into contact with dust attached to the mesh body 11. To place. Thus, by sliding the mesh body 11, the brush hairs 16a are in direct contact with the mesh body 11 or are directly in contact with dust adhering to the mesh body 11, so that the dust is removed by the brush hairs 16a. Can do.

  Here, the brush 16 can be installed either on the outside of the mesh body 11 (the outside of the housing 2) or on the inside of the mesh body 11 (the labyrinth 13 side). When the brush 16 is installed outside the mesh body 11, the dust is removed from the mesh body 11 by sliding the mesh body 11 and attaching the dust adhered to the mesh body 11 to the brush hair 16a. be able to. On the other hand, when the brush 16 is installed inside the mesh body 11, the mesh body 11 is slid and the dust adhering to the mesh body 11 is pushed out from the inside of the mesh body 11 by the brush bristles 16a. The dust can be removed from the net body 11 without allowing the dust to enter the inside of the portion 10, which is more preferable.

  The direction in which the brush 16 is installed is arbitrary. For example, when the brush 16 is installed on the outside of the fire detection unit 10 with respect to the net body 11, the direction from the brush base portion 16 b to the tip of the brush hair 16 a is directed forward in the sliding direction of the net body 11. It is also possible to prevent the brush hairs 16a from pushing dust into the fire detection unit 10 by installing. Further, the arrangement of the brush 16 is arbitrary. For example, in the smoke detector 1 of the type installed on the wall, from the ceiling surface side where dust is likely to accumulate on the net body 11 and from the top of the net body 11. Also, the brush 16 can be installed in front of the sliding direction. In this case, even if dust adheres to the ceiling surface side of the net body 11, the dust can be immediately removed by sliding the net body 11.

  Further, the brush base 16b can be rotated by providing a gear (not shown) for the brush 16 for transmitting the rotation of the gear 14 to the brush base 16b without fixing the brush base 16b. For example, by rotating the brush base 16b and moving the brush bristles 16a in the direction opposite to the sliding direction of the mesh body 11 and sweeping the surface of the mesh body 11, dust adhered to the surface of the mesh body 11 is also removed. Can be removed.

  Furthermore, the material which comprises the bristle 16a is arbitrary, for example, it comprises with resin containing nylon or polyester, and it can also make dust adhere to the bristle 16a effectively by charging the bristle 16a.

(Effect of Embodiment 4)
Thus, according to Embodiment 4, since the brush 16 for removing dust is provided in the vicinity of the net body 11, in addition to the dust removing action obtained by sliding the net body 11, The brush 16 can be brought into contact with the net body 11 to remove dust and the dust removal performance can be further improved. Therefore, even with respect to the smoke detector 1 installed in a place with a lot of oil such as a kitchen, it is possible to more reliably remove the dust having increased adhesiveness due to the adhesion of the oil.

[Embodiment 5]
Next, a fifth embodiment will be described. This form is a form in which airflow generating means is provided.

  FIG. 12 is a cross-sectional view of a net body according to the fifth embodiment. The configuration of the fifth embodiment is substantially the same as the configuration of the first embodiment except where otherwise specified, and the same configuration as that of the first embodiment is used in the first embodiment. The same reference numerals and / or names are attached as necessary, and the description thereof is omitted.

  As shown in FIG. 12, the net body 11 according to the fifth embodiment is configured to include a blade plate 17 outside the net body 11 (outside of the housing 2). The wing plate 17 is a means for accelerating the inflow of smoke into the fire detection unit 10 by the sliding of the mesh body 11, and corresponds to the airflow generation means in the claims. That is, the inflow of smoke into the fire detection unit 10 is promoted by sliding the mesh body 11 provided with the blade plate 17 to generate an air flow toward the inside of the fire detection unit 10.

  Specifically, a plurality of substantially flat blades 17 are installed outside the mesh body 11. The blade plate 17 is installed so that the line of intersection between the blade plate 17 and the mesh body 11 is not at least parallel to the sliding direction of the mesh body 11. Further, the blade plate 17 is installed such that the angle in the sliding direction of the mesh body 11 is an acute angle among the angles formed by the blade plate 17 and the mesh body 11. Thus, when the mesh body 11 is slid, an air flow is generated along the surface of the blade plate 17 on the rear side in the sliding direction of the mesh body 11, and negative pressure is generated on the surface. The air is supplied to the surface of the blade plate 17 from above. Further, the air existing between the blade plate 17 and the mesh body 11 is pushed out to the inside of the mesh body 11 by the blade plate 17. That is, it is possible to generate an air flow toward the inside of the fire detection unit 10 along the surface of the blade plate 17. Therefore, sliding the mesh body 11 not only prevents dust from accumulating on the mesh body 11, but also facilitates the inflow of smoke to the fire detection unit 10. Further, in the case of the smoke detector 1 of the type installed on the wall, the wing plate 17 functions as a trap for the net body 11, and dust entering the inside of the smoke detector 1 from the ceiling surface side accumulates on the net body 11. It can also be prevented.

  Although the size of the wing plate 17 is arbitrary, in the case of the smoke detector 1 with a built-in battery, since it is desired to reduce power consumption, the wing plate 17 is reduced in size to reduce the weight of the wing plate 17. It is desirable to suppress the load on the motor 15.

  Furthermore, the material of the wing plate 17 is arbitrary. For example, the wing plate 17 is made of a metal containing aluminum or a conductive resin blended with a metal filler material. Can be suppressed. Therefore, it is possible to prevent dust from adhering to the net body 11 via the blade plate 17. Further, when forming the mesh body 11 by processing a metal thin plate, the blade plate 17 can be formed simultaneously with the formation of the holes 11a constituting the mesh body 11 by the cutting and bending process in which bending is performed simultaneously with the cutting. Therefore, the assembly process of the net body 11 and the blade plate 17 can also be simplified.

(Effect of Embodiment 5)
As described above, according to the fifth embodiment, in addition to the basic effects similar to those of the first embodiment, the blade plate 17 that generates the airflow toward the inside of the fire detection unit 10 is provided on the net body 11. By sliding the mesh body 11, an air flow from the outside to the inside of the mesh body 11 can be generated, and the inflow of smoke into the fire detection unit 10 can be promoted by the air flow. Thereby, the responsiveness of the smoke detector 1 can be improved.

[Embodiment 6]
Next, a sixth embodiment will be described. In this form, the airflow generation means is arranged at a position different from that in the fifth embodiment.

  FIG. 13 is a cross-sectional view of a net body according to the sixth embodiment. The configuration of the sixth embodiment is substantially the same as the configuration of the fifth embodiment unless otherwise specified, and the configuration substantially the same as the configuration of the fifth embodiment is used in the fifth embodiment. The same reference numerals and / or names are attached as necessary, and the description thereof is omitted.

  As shown in FIG. 13, the net body 11 according to the sixth embodiment includes a blade plate 17 inside the net body 11 (labyrinth 13 side). The blade plate 17 is a means for accelerating the inflow of smoke into the fire detection unit 10 by sliding of the net body 11 as in the fifth embodiment, and corresponds to the airflow generation means in the claims.

  Specifically, a plurality of substantially flat blades 17 are installed inside the net body 11. The blade plate 17 is installed so that the line of intersection between the blade plate 17 and the mesh body 11 is not at least parallel to the sliding direction of the mesh body 11. In addition, the blade plate 17 is installed so that the angle in front of the sliding direction of the mesh body 11 becomes an obtuse angle among the angles formed by the blade plate 17 and the mesh body 11. As a result, when the mesh body 11 is slid, an air flow along the surface of the blade plate 17 on the rear side in the sliding direction of the mesh body 11 is generated, and negative pressure is generated on the surface. Air is supplied to the surface of the blade plate 17. Further, air existing in the sliding direction of the mesh body 11 with respect to the blade plate 17 is pushed by the blade plate 17 toward the labyrinth 13 side. That is, it is possible to generate an air flow toward the inside of the fire detection unit 10 along the surface of the blade plate 17. Therefore, sliding the mesh body 11 not only prevents dust from accumulating on the mesh body 11, but also facilitates the inflow of smoke to the fire detection unit 10.

  Further, when the blade plate 17 is installed on the mesh body 11 as described above, the air flow along the surface of the blade plate 17 on the rear side in the sliding direction of the mesh body 11 is reversed by reversing the sliding direction of the mesh body 11. (Indicated by an imaginary line in FIG. 13) occurs, and negative pressure is generated on the surface, so that air is supplied from the labyrinth 13 side to the surface of the blade plate 17. Further, the air existing in the sliding direction of the mesh body 11 with respect to the blade plate 17 is pushed out of the mesh body 11 by the blade plate 17. That is, it is possible to generate an air flow toward the outside of the net body 11 along the surface of the blade plate 17. Accordingly, the sliding direction of the mesh body 11 is temporarily intentionally reversed to generate an air flow from the inside of the mesh body 11 to the outside, whereby dust accumulated on the mesh body 11 is caused to flow through the mesh body 11 by the air flow. Can be blown outside. For example, immediately after the sliding of the net body 11, dust accumulated on the net body 11 is blown off the outside of the net body 11, and then the net body 11 is reversely rotated to flow smoke into the net body 11. By doing so, it is possible to prevent dust from flowing into the inside of the net body 11 and to allow smoke to actively flow into the inside of the net body 11 to improve the smoke detection sensitivity.

(Effect of Embodiment 6)
As described above, according to the sixth embodiment, in addition to the basic effects similar to those of the first embodiment, the blade plate 17 that generates the airflow toward the inside of the fire detection unit 10 is provided on the net body 11. By sliding the net 11, an air flow from the outside to the inside of the net 11 can be generated, and the inflow of smoke to the fire detection unit 10 can be promoted. Thereby, the responsiveness of the smoke detector 1 can be improved. In addition, by reversing the sliding direction of the mesh body 11 and generating an air flow from the inside of the mesh body 11 to the outside, dust accumulated on the mesh body 11 can be blown off to the outside of the mesh body 11, Dust can be removed using gas as a medium without friction and wear, and a stable dust removal structure can be constructed over a long period of time.

[III] Modifications to Each Embodiment While each embodiment according to the present invention has been described above, the specific configuration and means of the present invention are the same as the technical idea of each invention described in the claims. Modifications and improvements can be arbitrarily made within the range. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

(About the mutual relationship of each embodiment)
Each embodiment described above can be combined with each other in an arbitrary combination. For example, the brush 16 of the fourth embodiment is further provided on the mesh body 11 of the sixth embodiment, so that a sensor having the brush 16 on the outer side of the mesh body 11 and the wing plate 17 on the inner side is configured. May be.

(About the sliding means of the net)
In the above-described embodiment, the case has been described in which the gear body is slid directly by the gear by arranging the gear so that the gear teeth mesh with the holes constituting the mesh of the mesh body. The present invention is not limited to this. For example, by providing a projection that meshes with the gear on the outer periphery of the mesh body, the mesh body may be slid indirectly by the gear through the projection. . Further, the sliding pattern of the net body may be circulated, or may be vibrated by reciprocating in small increments. Or, instead of simply turning the mesh body, the mesh body is vibrated and dusted off by attaching a weight with a biased center of gravity to the motor shaft, such as used in mobile phone vibrators. You may do it. The method is not limited to a motor, and may be a device that can obtain the same effect. Further, the mesh body may be slid by manually rotating a rotary knob provided so as to be exposed from the housing without depending on electricity. Alternatively, the casing can be divided so that the portion around the smoke inlet is slidable, and the portion around the smoke inlet is connected to manually rotate the portion around the smoke inlet, so that the You may make it slide.

  The smoke detector according to the present invention can be applied to a fire detection means for detecting a fire by detecting the generation of smoke in a monitoring area, and is particularly applied to a fire detection means having a mesh body to determine the reliability of the fire detection means. It is useful for maintaining for a long time.

It is an external appearance perspective view of the smoke detector which concerns on Embodiment 1 of this invention. It is an internal perspective view of the smoke detector shown in FIG. It is a block diagram which shows notionally the electrical structure of a smoke sensor. FIG. 3 is a cross-sectional view showing an attachment portion of a net body 11 in a fire detection unit 10. 3 is a cross-sectional view showing a positional relationship between a net body 11 and a gear 14. FIG. It is a block diagram which shows notionally the electrical structure of the smoke detector which concerns on Embodiment 2 of this invention. It is a time chart which shows the detection process part and the start / stop cycle of a motor. It is a flowchart which shows the flow of the control action in the control part which concerns on Embodiment 3 of this invention. It is a flowchart which shows the flow of control operation with respect to a motor. It is a flowchart which shows the flow of control operation when operation with respect to an inspection switch is performed. It is an internal perspective view of the smoke detector which concerns on Embodiment 4 of this invention. It is sectional drawing of the net | network body which concerns on Embodiment 5 of this invention. It is sectional drawing of the net body which concerns on Embodiment 6 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Smoke detector 2 Case 3 Smoke inlet 10 Fire detection part 11 Net body 11a Hole 12 Groove 13 Labyrinth 14 Gear 14a Tooth 15 Motor 16 Brush 16a Brush hair 16b Brush base 17 Blade 20 Control part 21 Detection processing part 22 Start-up Control unit 30 Inspection switch 31 Operation button 32 Operation string

Claims (8)

Fire detecting means for detecting the occurrence of a fire by detecting a change in the concentration of smoke, and a net that is installed in a smoke inflow path to the fire detecting means and allows passage of smoke to the fire detecting means In the smoke detector,
Comprising a sliding means for sliding the mesh body;
A smoke detector. The sliding means is
A motor,
A gear that transmits rotation of the motor to the mesh body, and meshes with the mesh body;
The smoke detector according to claim 1, further comprising: Equipped with control means to perform operations related to fire detection,
The control means is for intermittently starting the fire detection means, and comprises a start control means for starting the sliding means together with the start of the fire detection means;
The smoke detector according to claim 1 or 2. An inspection operation instruction means for instructing the smoke detector to perform an inspection operation;
Based on the operation to the inspection operation instruction means, the sliding means can be activated,
The smoke detector according to any one of claims 1 to 3, wherein Installed in the vicinity of the mesh body, and provided with a removing means for removing deposits on the mesh body as the mesh body slides;
The smoke detector according to any one of claims 1 to 4, characterized by: An airflow generating means for generating an airflow in the vicinity of the mesh body by sliding the mesh body is provided in the mesh body;
The smoke detector according to any one of claims 1 to 5, wherein Forming the airflow generating means so that an airflow toward the inside of the fire detecting means is generated;
The smoke detector according to claim 6. Forming the air flow generation means so that an air flow directed to the outside of the fire detection means is generated;
The smoke detector according to claim 6 or 7.

Images