JP2019148880A - Heat sensor - Google Patents

Abstract

To provide a heat sensor capable of rapidly and correctly detecting a temperature change state of peripheral air.SOLUTION: In a sensor main body 1, sidewall parts 22 that are mutually opposed each other and vertically extending are respectively arranged on both side parts of a protection cover inner space A. The space A is formed as a vertically extending air passage A. A pair of fins 30 extending inward from sides of inner surfaces 22a of the respective sidewall parts 22 are arranged in the air passage A. A heat detection element 6 is arranged in an area on a direct upper side of an inter-fin passage part 30A formed between the pair of fins 30.SELECTED DRAWING: Figure 4

Description

  The present invention includes a sensor main body and a protective cover provided along the front surface of the sensor main body, and the inside of the protective cover formed between the front surface of the sensor main body and the back surface of the protective cover. The present invention relates to a heat sensor including a heat detection element in a space.

  2. Description of the Related Art There is known a heat detector that includes a heat detection element configured with a thermistor or the like in a space through which air passes (see, for example, Patent Document 1). Such a heat detector is, for example, a fire alarm device that outputs a warning sound or the like to notify a user of the occurrence of a fire when heat at an alarm level or higher is continuously detected by a heat detection element. It is configured.

  In such a heat sensor, for example, for the purpose of protecting the heat detection element provided projecting forward from the sensor body from an external impact or the like, the heat detection element is provided along the front surface of the sensor body. A protective cover is provided to cover the front. A space in the protective cover through which air passes is formed between the back surface of the protective cover and the front surface of the sensor body, and a heat detection element is provided in the space in the protective cover.

JP 2014-199632 A

  In the heat sensor as described above, it is desired to quickly and accurately detect the temperature change state of the surrounding air. For this purpose, it is necessary to allow ambient air that has become high temperature in the event of a fire or the like to flow into the protective cover inner space and to make good contact with the heat detection element without releasing heat as much as possible.

  In view of this situation, a main problem of the present invention is that a sensor body and a protective cover provided along the front surface of the sensor body are provided, and a front surface of the sensor body and a back surface of the protective cover are provided. In a heat sensor with a heat detection element in the space inside the protective cover formed between them, the ambient air that has become hot in the event of a fire, etc. flows well into the space inside the protective cover, and into the space inside the protective cover. The object is to provide a technique capable of quickly and accurately detecting the temperature change state of the surrounding air by appropriately bringing the inflowing air into contact with the heat detection element.

A first characteristic configuration of the present invention includes a sensor body, and a protective cover provided along a front surface of the sensor body,
A heat detector including a heat detection element in a space inside a protective cover formed between a front surface of the sensor main body and a rear surface of the protective cover;
Side walls that extend in the vertical direction opposite to each other are provided on both sides of the space in the protective cover, and the space in the protective cover is formed as an air passage that extends in the vertical direction.
A pair of fins extending inward from the inner surface side of each of the side wall portions in the air passage;
The heat detection element is provided in a region immediately above a passage portion between fins formed between the pair of fins.

According to this configuration, the inner space of the protective cover formed between the front surface of the sensor body and the rear surface of the protective cover is formed as an air passage extending in the vertical direction by providing the side wall portions on both side portions. can do. Therefore, when an upward flow of high-temperature air occurs in the event of a fire or the like, for example, air flows from the surroundings into the air passage through the air inlet on the lower end side and from the air passage through the air outlet on the upper end side. In a form in which air flows out to the surroundings, an upward flow of air can be generated from the lower end side toward the upper end side in the air passage.
Further, if such an air flow is generated in the air passage, the flow velocity increases when the air flow passes through the inter-fin passage portion formed between the pair of fins in the air passage. An air flow is formed toward the heat sensing element provided in the region immediately downstream thereof. Therefore, as much of the air that has flowed into the air passage as possible comes into contact with the heat detection element sequentially, so that the heat of the air can be positively transmitted to the heat detection element. Thereby, the temperature change state of the air flowing into the air passage in the heat detection element can be detected quickly and accurately.
Therefore, according to the present invention, a sensor body and a protective cover provided along the front surface of the sensor body, the protection formed between the front surface of the sensor body and the rear surface of the protective cover. In a heat sensor equipped with a heat detection element in the cover inner space, let the surrounding air that has become hot in the event of a fire, etc. flow well into the protective cover inner space, and properly flow the air that has flowed into the protective cover inner space. It is possible to provide a technique capable of quickly and accurately detecting the temperature change state of the surrounding air by contacting the heat sensing element.

  In the second characteristic configuration of the present invention, the pair of fins are formed to project from the front surface of the sensor body toward the protective cover side, and a gap is formed between the pair of fins and the rear surface of the protective cover. Is the point that is formed.

  According to this configuration, since the gap is formed between the pair of fins and the rear surface of the protective cover, the high-speed air flow generated in the inter-fin passage formed between the pair of fins is Due to the influence of the flow of air passing through the gap, it can be biased closer to the rear surface side of the protective cover than to the front surface side of the sensor body. Therefore, when installing the heat detection element in the air passage as far as possible from the main body of the sensor having a large heat capacity so as to improve the detection accuracy, the position of the heat detector is close to the rear surface of the protective cover, or on the diagonally downward wall surface. Even if the air immediately after flowing into the air passage is attached to the front surface of the sensor body, the high-speed air flow generated in the inter-fin passage portion of the air passage is biased toward the rear surface side of the protective cover. Appropriate contact with the heat sensing element is possible.

  A third characteristic configuration of the present invention is that an opening hole is formed in the protective cover to open the front side of the heat detection element and the inter-fin passage portion.

According to this configuration, for example, even when the heat detector is mounted on a ceiling surface or a diagonally downward wall with the front face of the protective cover having an open hole facing downward or diagonally downward, in the event of a fire, etc. When an upward flow of high-temperature air occurs in the surrounding area, the upward flow of the high-temperature air generated in the surrounding area is caused to flow into the heat detection element in the air passage and the installation part of the inter-fin passage portion through the open hole formed in the protective cover. Thus, it can be positively brought into contact with the heat detection element. In addition, since the open hole that opens the air passage to the periphery extends from the front side of the heat detection element toward the front side of the inter-fin passage portion on the lower side, the high temperature generated in the surroundings through the open hole It is possible to facilitate the upward flow of air to flow into the air passage, and furthermore, the hot air that has flowed in can be satisfactorily brought into contact with the heat detection element on the upper side.
Furthermore, as in the second feature configuration, if a gap is formed between the pair of fins and the rear surface of the protective cover, an increase in pressure on the upstream side of the pair of fins in the air passage is suppressed. Therefore, it is possible to suppress the outflow of air from the air passage due to the pressure increase through the open hole.

4th characteristic structure of this invention is equipped with the protruding part which protrudes ahead from the front surface of the said sensor main body in the both sides of the said air path, respectively.
The fins are provided on the front side of each raised portion;
The heat detection element is provided in a region between the raised portions.

  According to this configuration, by providing the raised portion that protrudes forward from the front surface of the sensor body, it is possible to expand the electronic component installation area inside the sensor body. And when providing such a raised part, the said raised part is provided in each of the both sides of an air path, a fin is provided in the front side of each raised part, and also between each raised part. It is desirable to provide a heat detection element in the region. In other words, the air flow generated in the inter-fin passage portion between the pair of fins provided on the front side of both raised portions is reliably maintained in the region between the raised portions, and the heat detection provided in the same region. The element can be suitably brought into contact.

The perspective view of the heat sensor of this embodiment The figure which shows the installation state of the heat sensor of this embodiment The figure which shows the installation state of the heat sensor of this embodiment Front view (a), side view (b), and bottom view (c) of the heat sensor of this embodiment Front view (a), side view (b), and bottom view (c) of heat sensor of another embodiment Front view (a), side view (b), and bottom view (c) of heat sensor of another embodiment Front view (a), side view (b), and bottom view (c) of heat sensor of another embodiment

An embodiment of the present invention will be described with reference to FIGS.
The heat sensor 100 according to the present embodiment is configured as a fire alarm device including a sensor body 1 and a heat detection element 6 disposed on the front surface 1a of the sensor body 1.
The heat sensor 100 can be mounted in a posture in which the front surface 1a faces the same direction as the ceiling surface or wall surface along the ceiling surface or wall surface facing the room. For example, when attaching to the wall surface, as shown in FIG. 2, the front surface 1a can be attached to the vertical wall surface W in a posture that is horizontally oriented, but as shown in FIG. 3, the front surface 1a is oriented obliquely downward. It can also be attached to the wall W diagonally downward.

  In the present embodiment, the sensor body 1 is configured in a substantially rectangular parallelepiped shape, but may be configured in another shape such as a columnar shape or a disk shape. Moreover, the heat detection element 6 is comprised as temperature sensing parts, such as a well-known thermistor and a bimetal. The heat detection element 6 is installed so as to protrude forward from the front surface 1 a of the sensor body 1, and a lead wire portion extending rearward from the heat detection element 6 is an abbreviation of the front surface 1 a of the sensor body 1. Supported in the center.

  Although illustration is omitted, the sensor body 1 contains a control board, a power supply unit, and the like, and the control board or the like constitutes notification means for notifying the user. In addition, on the front surface 1a of the sensor main body 1, a speaker hole for outputting sound to the outside and a light emitting part of an LED lamp are arranged. Then, for example, when the heat detection element 6 continuously detects heat of an alarm level or higher, the notification means outputs an alarm sound or voice guidance from a speaker hole or flashes a light emitting unit. The fire is notified to the user. Further, an alarm stop button 4 for stopping the alarm when an alarm is output in the event of a fire or the like is provided below the front surface 1a of the sensor body 1, for example. Although details will be described later, the alarm stop button 4 is configured by using a lower end portion of a protective cover 20 described later.

  As shown in FIG. 1, the front surface 1 a of the sensor body 1 covers the front of the heat detection element 6 in order to protect the heat detection element 6 provided protruding from the front surface 1 a from external impact or the like. A protective cover 20 is provided. The protective cover 20 is disposed in front of the heat detection element 6, and is substantially bilaterally symmetric about a vertical axis that is substantially parallel to the front surface 1 a of the sensor body 1 and passes through the front side of the heat detection element 6. It is comprised by the rectangular plate-shaped member. By providing such a protective cover 20, a flat protection is provided between the rear surface 20a of the protective cover 20 and the front surface 1a of the sensor body 1, as shown in FIGS. 4B and 4C. A space in the cover is formed.

On the lower side of the heat sensor 100, an alarm stop button 4 is provided for stopping the alarm when an alarm is output in the event of a fire or the like. Specifically, the alarm stop button 4 is configured using the lower end portion of the protective cover 20. That is, a pressing element 4 </ b> A that protrudes toward the inside of the sensor body 1 is provided at a substantially central portion of the lower end portion of the protective cover 20. In the pressing operation of the alarm stop button 4, when the lower end portion of the protective cover 20 is pressed toward the front surface 1a of the sensor main body 1, the lower end portion of the protective cover 20 is bent, so that the substantially central portion thereof is bent. A switch element (not shown) provided in the sensor body 1 is pressed by the provided pressing element 4A, and predetermined processing such as alarm stop is executed.
In the front surface 1a of the sensor main body 1, a sleeve portion 1A surrounding the presser 4A is formed to protrude around the through hole of the presser 4A.

  As shown in FIG. 4, a support portion 21 for supporting the protective cover 20 on the sensor main body 1 is provided between the protective cover 20 and the sensor main body 1. The support portion 21 is formed integrally with the protective cover 20 so as to protrude rearward from the left and right side edges of the rear surface 20 a of the protective cover 20, and the tip portion thereof is the front surface of the sensor body 1. It is fixed to 1a.

Further, as shown in FIG. 4, side wall portions 22 extending in the vertical direction facing each other are provided on the left and right side portions of the space inside the protective cover formed between the protective cover 20 and the sensor body 1. It has been. Each of these side wall portions 22 is provided between the inner portion of each support portion 21 on the rear surface 20 a of the protective cover 20 and the front surface 1 a of the sensor body 1. Each of the side wall portions 22 is a plate-like portion that is perpendicular to the rear surface 20a of the protective cover 20 and the front surface 1a of the sensor body 1 and extends in the vertical direction and is perpendicular to the lateral width direction. Is formed.
That is, the space inside the protective cover between the front surface 1a of the sensor main body 1 and the rear surface 20a of the protective cover 20 is defined by the inner surfaces 22a of the left and right side wall portions 22 extending vertically on both left and right sides, thereby lowering the lower end. It is formed as an air passage A extending in the vertical direction from the air inlet Ai on the side to the air outlet Ao on the other end side.

In the heat sensor 100 having such an air passage A, when a high-temperature air upward flow F (see FIGS. 2 and 3) is generated around a fire in the event of a fire, the air flows through the air inlet Ai on the lower end side. Air flows into the air passage A from the surroundings, and air flows out from the air passage A to the surroundings through the air outlet Ao on the upper end side. From the air inlet Ai to the air outlet Ao in the air passage A. An upward flow of air will be generated.
Further, even when the heat sensor 100 is mounted along the ceiling surface so that the front surface 1a faces downward, for example, when the fire source is away from the heat sensor 100, FIG. 3, an air flow from the air inlet Ai toward the air outlet Ao may occur in the air passage A.

  A pair of fins 30 extending inward from the inner surfaces 22a of the left and right side wall portions 22 are provided in the air passage A in which an upward flow of air (air flow from the air inlet Ai toward the air outlet Ao) occurs when a fire occurs. Is provided. The pair of fins 30 are provided at the same height in the vertical direction, and are perpendicular to the rear surface 20a of the protective cover 20 and the front surface 1a of the sensor body 1 and in the transverse direction of the air passage A (that is, in the horizontal width direction). ). An inter-fin passage portion 30 </ b> A formed between the tip portions of the pair of fins 30 is formed at a substantially central portion in the transverse direction of the air passage A.

  As described above, the inter-fin passage portion 30A formed between the pair of fins 30 allows air to flow through the air passage A by reducing the cross-sectional area of the air passage A when an upward flow of air occurs in the air passage A. It functions as an aperture part to be turned on. Further, in the air passage A, the heat detection element 6 disposed at a substantially central portion in the transverse direction of the air passage A is provided in a region immediately above the inter-fin passage portion 30A.

  When an upward flow of air is generated in the air passage A at the time of a fire occurrence, the air flow passes through the inter-fin passage portion 30 </ b> A as a constricted portion formed between the pair of fins 30. A high-speed air flow is formed toward the heat detection element 6 provided in the region immediately above the portion 30A. Therefore, as much of the air that has flowed into the air passage A as possible comes into contact with the heat detection element 6 sequentially, and the heat of the air is positively transmitted to the heat detection element 6. As a result, the temperature change state of the air flowing into the air passage A in the heat detection element 6 can be detected quickly and accurately.

  In the air passage A, the inter-fin passage portion 30A and the heat detection element 6 are provided at a substantially central portion in the transverse direction of the air passage A, so that the air flowing through the air passage A has a well-balanced inter-fin passage portion 30A. Flow into. Then, since the high-speed air flow that passes through the inter-fin passage portion 30A becomes a stable and substantially linear shape, the air flow is stably and surely applied to the heat detection element 6 provided in the region immediately downstream thereof. Can be contacted. As a result, the heat of the air flowing into the air passage A is stably transmitted to the heat detection element 6, and the temperature change state of the air can be detected more quickly and accurately by the heat detection element 6.

In the air passage A, the heat detection element 6 is provided at a position close to the rear surface 20a of the protective cover 20 as far as possible from the front surface 1a of the sensor body 1 having a large heat capacity in order to improve detection accuracy. As described above, the high-speed air flow generated in the inter-fin passage portion 30A of the air passage A is appropriately in contact with the heat detection element 6 disposed closer to the protective cover 20 than the sensor body 1 is. Configuration is adopted. That is, the pair of fins 30 that form the inter-fin passage portion 30 </ b> A are formed so as to protrude from the front surface 1 a of the sensor body 1 toward the protective cover 20, and the rear surfaces of the pair of fins 30 and the protective cover 20. A gap 30B is formed between 20a and 20a.
By providing such a pair of fins 30, the high-speed air flow generated in the inter-fin passage portion 30 </ b> A is more protected than the front surface 1 a side of the sensor body 1 due to the influence of the air flow passing through the gap 30 </ b> B. The cover 20 can be biased to a position close to the rear surface 20a side. Therefore, this high-speed airflow can be satisfactorily brought into contact with the heat detection element 6 provided at a position close to the rear surface 20a of the protective cover 20.

  The protective cover 20 which is a wall portion defining the air passage A is formed with an open hole 20b that opens the front side of the heat detection element 6 and the front side of the inter-fin passage portion 30A. The opening hole 20b is an opening hole that opens the installation site of the heat detection element 6 and the inter-fin passage portion 30A to the outside in the protective cover 20 that defines the air passage A. The open hole 20b is formed in an elongated hole shape that is longer in the vertical direction than in the width direction, has a width slightly larger than the diameter of the heat detection element 6, and is provided with the inter-fin passage portion 30A in the vertical direction. The length extends from a position slightly below the position to a position slightly above the position where the heat detection element 6 is installed.

When the heat sensor 100 is attached to the ceiling surface or attached to the diagonally downward wall W with the front surface 1a facing obliquely downward as shown in FIG. When the flow F is generated, the upward flow F of high-temperature air generated around the flow F flows into the heat detection element 6 in the air passage A and the inter-fin passage portion 30 </ b> A through the opening hole 20 b formed in the protective cover 20. At that time, particularly in the attachment state shown in FIG. 3, the open hole 20b that opens the air passage A to the periphery extends from the front side of the heat detection element 6 toward the front side of the inter-fin passage portion 30A on the lower side. By being formed in the shape of the existing long hole, the upward flow F of the surrounding high-temperature air is likely to flow into the air passage A through the open hole 20b while rising.
Then, the air flowing into the air passage A through the open hole 20b can be positively and satisfactorily brought into contact with the heat detection element 6 facing the upper side of the open hole 20b.

  Further, in the air passage A, as shown in FIGS. 4B and 4C, a gap 30B is formed between the pair of fins 30 and the rear surface 20a of the protective cover 20, so that the air passage A The pressure rise on the upstream side of the pair of fins 30 is suppressed. Therefore, the air flowing through the upstream side of the pair of fins 30 in the air passage A is suppressed from flowing out to the surroundings via the lower end portion of the open hole 20b located on the front side, and as a result, the heat detection element More air can be brought into contact with 6.

The front surface 1a of the sensor body 1 is provided with a raised portion 1B that protrudes forward for the purpose of, for example, expanding the electronic component installation area inside the sensor body 1. As shown in FIG. 4A, the raised portions 1 </ b> B are disposed on both the left and right sides of the front surface 1 a of the sensor body 1. Specifically, each of the left and right raised portions 1B has a trapezoidal cross section when viewed from the bottom, as shown in FIG. 4C, and the entire air passage A as shown in FIG. 4B. It is comprised as what extends in an up-down direction over. The front surface of the raised portion 1B is formed as a surface that is spaced apart and opposed to the rear surface 20a of the protective cover 20, and the side wall portions 22 and the fins 30 are provided on the front side of the raised portion 1B. Is provided. Further, in the region between the left and right raised portions 1B, a concave portion 1C extending in the vertical direction is formed, and the heat detecting element 6 is disposed in the concave portion 1C.
Therefore, the air flow generated in the inter-fin passage portion 30A is reliably maintained in the concave portion 1C provided in the region between the left and right raised portions 1B, and is suitable for the heat detection element 6 provided in the concave portion 1C. Can be contacted.

[Another embodiment]
Another embodiment of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied alone, but may be applied in combination with the configuration of another embodiment.
(1) In the above embodiment, the pair of fins 30 are formed so as to protrude from the front surface 1a of the sensor body 1 toward the protective cover 20 so as to provide a gap 30B between the rear surface 20a of the protective cover 20. The pair of fins 30 only need to extend inward from the inner surface sides of the left and right side wall portions 22 in the air passage A and form an inter-fin passage portion 30A as a constriction portion therebetween. The shape and arrangement state of the fins 30 such as the height can be modified as appropriate.
For example, as shown in FIG. 5, the pair of fins 30 forming the inter-fin passage portion 30 </ b> A between the front surface 1 a of the sensor body 1 and the protective cover 20 can be formed without forming the gap as described above. It may be provided so as to extend between the rear surface 20a.
Further, as shown in FIG. 6, a pair of fins 30 are formed so as to protrude from the rear surface 20a of the protective cover 20 toward the sensor body 1 so as to provide a gap 30B between the front surface 1a of the sensor body 1. It doesn't matter.

(2) Although the raised portion 1B is provided on the front surface 1a of the sensor body 1 in the above embodiment, the shape and the arrangement state of the raised portion 1B can be appropriately modified.
For example, as shown in FIG. 7, the raised portion may not be provided on the front surface 1 a of the sensor body 1, and the side wall portions 22 and the fins 30 may be provided on the front surface 1 a. In this case, the flow path cross-sectional area of the air passage A between the front surface 1a of the sensor body 1 and the rear surface 20a of the protective cover 20 can be enlarged. This makes it easier for air to flow into the air passage A from the surroundings via the air inlet Ai, and the amount of air that contacts the heat detection element 6 can be further increased.

(3) In the above embodiment, as shown in FIG. 2 and FIG. 3, the example in which the heat sensor 100 is attached to the wall surface W horizontally or obliquely downward has been described, but the heat sensor 100 is installed on the ceiling surface. You can also. Further, even when the heat sensor 100 is installed on the ceiling surface and the front surface 1a of the sensor body 1 is in a downward posture, an upward flow of high-temperature air generated in the surroundings in the event of a fire, The air can be introduced into the air passage A through the open hole 20 b formed in the protective cover 20 and brought into contact with the heat detection element 6.

(4) In the above embodiment, the inter-fin passage portion 30 </ b> A as the constricted portion formed between the pair of fins 30 and the heat detection element 6 provided immediately downstream thereof are arranged in the transverse direction of the air passage A. However, it is sufficient that the heat detection element 6 is located immediately downstream of the inter-fin passage portion 30A, and the installation positions of the heat detection elements 6 in the inter-fin passage portion 30A are as follows. You may change suitably.

(5) In the above embodiment, the protective cover 20 has an opening hole that opens the front side of each of the installation positions of the heat detection element 6 installation position and the inter-fin passage portion 30A formed between the pair of fins 30 to the outside. Although 20b is formed, the shape and position of the open hole 20b may be appropriately modified. Further, when it is not necessary to allow air to flow into the air passage A through the open hole 20b, the open hole 20b may be omitted.

DESCRIPTION OF SYMBOLS 1 Sensor main body 1B Raised part 1a Front surface of sensor main body 6 Heat detection element 20 Protective cover (wall part which defines air passage)
20a Protective cover rear surface 20b Open hole 22 Side wall 22a Side wall inner surface 30 Fin 30A Inter-fin passage (throttle portion)
30B Clearance 100 Heat sensor A Air passage Ai Air inlet Ao Air outlet

Claims (4)

A sensor body, and a protective cover provided along the front surface of the sensor body,
A heat detector including a heat detection element in a space inside a protective cover formed between a front surface of the sensor main body and a rear surface of the protective cover;
Side walls that extend in the vertical direction opposite to each other are provided on both sides of the space in the protective cover, and the space in the protective cover is formed as an air passage that extends in the vertical direction.
A pair of fins extending inward from the inner surface side of each of the side wall portions in the air passage;
A heat detector in which the heat detection element is provided in a region immediately above a passage portion between fins formed between the pair of fins.   The pair of fins are formed so as to protrude from the front surface of the sensor main body toward the protective cover, and a gap is formed between the pair of fins and the rear surface of the protective cover. The described thermal sensor   The heat detector according to claim 1, wherein an opening hole is formed in the protective cover to open a front side of the heat detection element and the inter-fin passage portion. On both sides of the air passage, each has a raised portion that protrudes forward from the front surface of the sensor body,
The fins are provided on the front side of each raised portion;
The heat sensor according to any one of claims 1 to 3, wherein the heat detection element is provided in a region between the raised portions.

Images