Connection auxiliary tool
The connection auxiliary tool addresses the issue of rust formation in fire detectors by sealing the gap between the insulating wire and the fire detector's connector, effectively preventing water ingress and ensuring reliable operation without the need for extensive installations.
Patent Information
- Application Number
- JP2023203153
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-06-11
AI Technical Summary
Existing fire detectors are prone to rust when an insulating wire is connected, leading to malfunction or disconnection, and existing solutions require large-scale installations to prevent water ingress.
A connection auxiliary tool with an elastic main body and a through hole is inserted into the receiving hole of the fire detector's connector to seal the gap between the receiving hole and the insulating wire, preventing water ingress and rust formation.
The connection auxiliary tool effectively suppresses rust formation on the conductor of the insulating wire connected to the fire detector without the need for large-scale installations.
Smart Images
Figure 2025088446000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a connection auxiliary tool.
Background Art
[0002] Buildings such as buildings and condominiums are obliged to install fire detectors based on the Fire Service Act. Fire detectors play a role in detecting heat, smoke, etc. during a fire. Fire detectors include types such as heat detectors, smoke detectors, and flame detectors depending on the detection target.
[0003] For example, Patent Document 1 discloses such a fire detector.
Prior Art Documents
Patent Documents
[0004]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0005] An insulating wire is connected to the above-described fire detector, and the insulating wire is inserted into the fire detector through an opening provided in the fire detector. However, such an opening is likely to become an inlet for water, and when water enters the inside of the fire detector, rust (for example, verdigris) may occur on the conductor of the insulating wire. Rust generated on the conductor of the insulating wire may cause malfunction of the fire detector or disconnection of the insulating wire.
[0006] To address such problems, Patent Document 1 discloses attaching a fire detector water immersion prevention plate having an opening for inserting an insulated wire to the ceiling and attaching a fire detector to the plate. Since the fire detector water immersion prevention plate has an opening through which the insulated wire can be inserted in a liquid-tight manner, it is possible to prevent water from entering the fire detector. However, with such a configuration, it is necessary to install a fire detector water immersion prevention plate on the ceiling, which makes the device large-scale.
[0007] An object of the present invention is to provide a connection auxiliary tool that can suppress the occurrence of rust on the conductor of an insulated wire connected to a fire detector.
Means for Solving the Problems
[0008] According to one aspect of the present invention for solving the above problems, A connection auxiliary tool that is inserted into the receiving hole of the insulated wire of the connector of the fire detector to seal the gap between the receiving hole and the insulated wire, A main body having elasticity for being inserted into the receiving hole, A through hole disposed in the main body for inserting the insulated wire, And having, The main body includes a first outer peripheral surface configured to contact the receiving hole, The through hole includes a first inner peripheral surface configured to contact the insulator of the insulated wire, A connection auxiliary tool is provided, which is characterized by the above.
Effects of the Invention
[0009] According to the present invention, it is possible to provide a connection auxiliary tool that can suppress the occurrence of rust on the conductor of an insulated wire connected to a fire detector.
Brief Description of the Drawings
[0010]
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
MODE FOR CARRYING OUT THE INVENTION
[0011] Hereinafter, preferred embodiments of the present invention will be described. In this specification, regarding the description of "~" indicating a numerical range, the lower limit value and the upper limit value are included in the numerical range.
[0012] [Embodiment 1] FIG. 1A is a cross-sectional view showing a state in which a connection aid 10 according to Embodiment 1 assists in connecting the insulated electric wire 2 of the cable 1 and the connector 4 of the fire detector 3. FIG. 1B is a partially enlarged cross-sectional view of FIG. 1A, showing the detailed configuration of the cross-section of the connection aid 10.
[0013] As shown in FIG. 1A, the cable 1 is wired on the back side of the ceiling 5, and through the opening of the ceiling 5, the insulated electric wire 2 at the end of the cable 1 is connected to the fire detector 3. Here, as shown in FIG. 1B, the connection auxiliary tool 10 assists the connection by sealing between the insulator 2a around the conductor 2b of the insulated electric wire 2 of the cable 1 and the receiving hole 4a of the insulated electric wire 2 of the connector 4 of the fire detector 3. Thereby, the intrusion of water into the connector 4 is suppressed, and the rusting of the conductor 2b of the insulated electric wire 2 is suppressed.
[0014] Hereinafter, the details of the connection auxiliary tool 10 will be described with reference to FIGS. 2A to 2D. FIG. 2A is a side view of the connection auxiliary tool 10, FIG. 2B is a plan view, FIG. 2C is a bottom view, and FIG. 2D is a cross-sectional view taken along line D-D of FIG. 2B. As shown in FIGS. 2A to 2D, the connection auxiliary tool 10 is substantially cylindrical and has a main body 11 having a through hole 12 and a protruding portion 13. The connection auxiliary tool 10 preferably has elasticity, and the material is, for example, resin, elastomer, etc. More specifically, examples of the material of the connection auxiliary tool 10 include silicone, polyvinyl chloride (PVC), polyethylene (PE), etc. The connection auxiliary tool 10 is integrally formed by, for example, injection molding.
[0015] (Main body) The main body 11 is the main part of the connection auxiliary tool 10 and has a portion inserted into the receiving hole 4a of the insulated electric wire 2 of the connector 4 and a through hole 12 into which the insulated electric wire 2 is inserted. Such a main body 11 is substantially cylindrical and seals between the insulated electric wire 2 and the receiving hole 4a (see FIG. 1B). The main body 11 preferably has elasticity to perform the sealing function. In the present embodiment, since the connection auxiliary tool 10 is made of an elastic material, the main body 11 also has elasticity.
[0016] (Through hole) The through-hole 12 is disposed in the main body 11 and is for inserting the insulated electric wire 2. The inner peripheral surface of the through-hole 12 has a first inner peripheral surface 12a configured to contact the insulator 2a of the insulated electric wire 2 and a second inner peripheral surface 12b configured to contact the conductor 2b of the insulated electric wire 2. The shape of the through-hole 12 may be appropriately designed so as to have the first inner peripheral surface 12a and the second inner peripheral surface 12b. In the present embodiment, the shape of the through-hole 12 is a stacked shape of a cylinder on the inlet side of the insulated electric wire 2 having a larger diameter formed so as to have the first inner peripheral surface 12a and a cylinder on the outlet side of the insulated electric wire 2 having a smaller diameter formed so as to have the second inner peripheral surface 12b. Also, in the present embodiment, regarding the axial direction of the through-hole 12, the length of the cylinder on the inlet side is longer than the length of the cylinder on the outlet side.
[0017] The first inner peripheral surface 12a is a portion that contacts the insulator 2a of the insulated electric wire 2 when the insulated electric wire 2 is inserted into the through-hole 12. In the present embodiment, the first inner peripheral surface 12a is in contact with the insulator 2a of the insulated electric wire 2 without a gap over the entire circumference. The diameter of the first inner peripheral surface 12a is larger than the diameter of the second inner peripheral surface 12b described later and smaller than the diameter of the first outer peripheral surface described later. The diameter of the first inner peripheral surface 12a is, for example, 1.0 mm to 1.3 mm. The first inner peripheral surface 12a may be the entire inner peripheral surface of the through-hole 12 that faces the insulator 2a of the insulated electric wire 2 when the insulated electric wire 2 is inserted into the through-hole 12, or may be a part thereof. In the present embodiment, the first inner peripheral surface 12a is the entire inner peripheral surface that faces the insulator 2a as shown in FIG. 1B. In the case of a part, it is preferable that the first inner peripheral surface 12a exists at the end on the inlet side of the insulated electric wire 2 of the inner peripheral surface of the through-hole 12. Thereby, it becomes easier to suppress the intrusion of water into the connector 4.
[0018] The mode in which the first inner peripheral surface 12a contacts the insulator 2a of the insulated wire 2 may be appropriately set from the viewpoint of balancing the ease of insertion of the insulated wire 2 and the desired waterproof performance. The mode in which the first inner peripheral surface 12a contacts the insulator 2a of the insulated wire 2 may be appropriately set, for example, from a fitting degree that can hold the insulated wire 2 to a fitting degree that is liquid-tight. Specifically, the first inner peripheral surface 12a may be formed to be substantially the same as or slightly smaller than the diameter of the insulator 2a. This suppresses water from entering the connector 4 through the insulated wire 2.
[0019] The second inner peripheral surface 12b is a portion that contacts the conductor 2b when the insulated wire 2 is inserted into the through hole 12. In the present embodiment, the second inner peripheral surface 12b is in contact with the conductor 2b of the insulated wire 2 without a gap over the entire circumference. The diameter of the second inner peripheral surface 12b is smaller than the diameter of the first inner peripheral surface 12a. The diameter of the second inner peripheral surface 12b is, for example, 0.9 mm to 1.2 mm. The second inner peripheral surface 12b may be the entire inner peripheral surface of the through hole 12 facing the conductor 2b of the insulated wire 2 or a part thereof when the insulated wire 2 is inserted into the through hole 12. In the present embodiment, as shown in FIG. 1B, the second inner peripheral surface 12b is the entire inner peripheral surface of the through hole 12 facing the conductor 2b.
[0020] The mode in which the second inner peripheral surface 12b contacts the conductor 2b may be appropriately set from the viewpoint of balancing the ease of insertion of the conductor 2b of the insulated wire 2 into the through hole 12 and the desired waterproof performance. The mode in which the second inner peripheral surface 12b contacts the conductor 2b may be appropriately set from a fitting degree that can hold the conductor 2b to a fitting degree that is liquid-tight. Specifically, the second inner peripheral surface 12b may be formed to be substantially the same as or slightly smaller than the diameter of the conductor 2b. This suppresses water from entering between the conductor 2b and the insulator 2a through the conductor 2b when water enters the connector 4, and suppresses rusting of the conductor 2b covered by the insulator 2a.
[0021] (First outer peripheral surface) The first outer peripheral surface 11a is the portion of the outer peripheral surface of the main body 11 inserted into the receiving hole 4a of the connector 4 that contacts the inner peripheral surface of the receiving hole 4a. The portion of the main body 11 inserted into the receiving hole 4a of the connector 4 may be appropriately designed to have the first outer peripheral surface 11a. The diameter of the first outer peripheral surface 11a is larger than the diameter of the first inner peripheral surface 12a. The diameter of the first outer peripheral surface 11a is, for example, 1.2 mm to 2.0 mm. In the present embodiment, the portion of the main body 11 inserted into the receiving hole 4a of the connector 4 has a cylindrical shape that conforms to the shape of the receiving hole 4a. As a result, in the present embodiment, as shown in FIG. 2C, the first outer peripheral surface 11a is circular when the connection auxiliary tool 10 is viewed from the bottom.
[0022] The first outer peripheral surface 11a may be the entire outer peripheral surface of the main body 11 facing the inner peripheral surface of the receiving hole 4a, or may be a part thereof. In the present embodiment, as shown in FIG. 1B, the first outer peripheral surface 11a is the entire outer peripheral surface of the main body 11 facing the inner peripheral surface of the receiving hole 4a. The manner in which the first outer peripheral surface 11a contacts the inner peripheral surface of the receiving hole 4a can range from a fitting that can hold the connection auxiliary tool 10 to a liquid-tight fitting. This suppresses the ingress of water into the connector 4.
[0023] The axial length of the first outer peripheral surface 11a may be appropriately set according to, for example, the ease of insertion of the connection auxiliary tool 10 into the receiving hole 4a and the desired degree of fitting (liquid tightness).
[0024] (Overhanging portion) The overhanging portion 13 is a portion that protrudes from the outer peripheral surface of the main body 11 of the connection auxiliary tool 10. When the main body 11 is inserted into the receiving hole 4a, it prevents the entire main body 11 from being inserted and also prevents water from entering between the main body 11 (the first outer peripheral surface 11a) and the receiving hole 4a. The overhanging portion 13 is not particularly limited as long as it can perform this function. In the present embodiment, the overhanging portion 13 protrudes radially from the outer periphery of the cylindrical main body 11 and is ring-shaped. The overhanging portion 13 may have any configuration, and the connection auxiliary tool 10 may or may not have the overhanging portion 13.
[0025] (Effect) According to the connection auxiliary tool 10 according to the first embodiment, it is possible to suppress the occurrence of rust on the conductor 2b of the insulated wire 2 connected to the fire detector 3.
[0026] [Second Embodiment] FIG. 3 is an enlarged cross-sectional view showing a state in which the connection auxiliary tool 20 according to the second embodiment assists the connection between the insulated wire 2 of the cable 1 and the connector 4 of the fire detector 3.
[0027] FIG. 4A is a side view of the connection auxiliary tool 20, FIG. 4B is a plan view of the connection auxiliary tool 20, FIG. 4C is a bottom view of the connection auxiliary tool 20, and FIG. 4D is a cross-sectional view taken along line D-D of FIG. 4B.
[0028] The connection auxiliary tool 20 according to the second embodiment is different from the connection auxiliary tool 10 according to the first embodiment in that, as shown in FIG. 3, it has a through hole 22 having a first inner peripheral surface 22a configured to contact the insulator 2a of the insulated wire 2 and a third inner peripheral surface 22c configured not to contact the insulator 2a of the insulated wire 2. Further, as shown in FIG. 3, the connection auxiliary tool 20 is different from the connection auxiliary tool 10 according to the first embodiment in that the main body 21 has an insulated wire protection portion 23. Regarding the connection auxiliary tool 20 according to the second embodiment, the same components as those of the connection auxiliary tool 10 are denoted by the same reference numerals and the description thereof is omitted.
[0029] The through hole 22 is not particularly limited as long as it is configured to have a first inner peripheral surface 22a and a third inner peripheral surface 22c. The diameter of the first inner peripheral surface 22a is, for example, 1.0 mm to 1.3 mm. In the present embodiment, as shown in FIG. 4D, the shape of the through hole 22 is a shape in which a cylinder on the inlet side having a smaller diameter and configured to have the first inner peripheral surface 22a and a cylinder on the outlet side having a larger diameter and configured to have the third inner peripheral surface 22c are stacked. Further, in the present embodiment, the axial length of the cylinder on the inlet side is longer than the axial length of the cylinder on the outlet side.
[0030] The third inner peripheral surface 22c is located at the end on the outlet side of the through hole 22. As shown in FIG. 3, a gap is initially formed between the third inner peripheral surface 22c and the insulator 2a of the insulated wire 2. Therefore, the third inner peripheral surface 22c does not make it difficult to insert the insulated wire 2. By having the third inner peripheral surface 22c, the connection auxiliary tool 20 suppresses water from accumulating in the closed space between the insulator 2a of the insulated wire 2 and the connection auxiliary tool 20 when the shrink-back phenomenon occurs in the insulated wire 2. Thereby, it can be expected that rusting of the conductor 2b is suppressed. That is, in the connection auxiliary tool 10 according to the first embodiment, when the shrink-back phenomenon occurs in the insulated wire 2, the insulator 2a retreats, and a closed space is generated between the end face of the insulator 2a of the insulated wire 2 and the connection auxiliary tool 10 (see FIG. 1B). If water accumulates in this space, the conductor 2b is likely to rust. On the other hand, in the connection auxiliary tool 20, such a closed space does not occur even when the shrink-back phenomenon occurs (see FIG. 3). Thereby, it is considered that the conductor 2b is less likely to rust. In the present embodiment, since the contact area between the first inner peripheral surface 22a and the insulator 2a does not change even when the shrink-back phenomenon occurs, the insulated wire 2 is not likely to come off. The diameter of the third inner peripheral surface 22c is larger than the diameter of the first inner peripheral surface 22a. The diameter of the third inner peripheral surface 22c is, for example, 1.1 mm to 1.4 mm.
[0031] The insulated wire protection part 23 is configured such that the first outer peripheral surface 11a of the main body 21 is located outside the connector 4 when it comes into contact with the receiving hole 4a of the connector 4. Further, the insulated wire protection part 23 becomes thinner continuously or intermittently as it moves away from the first outer peripheral surface 11a. Alternatively, the insulated wire protection part 23 has a bellows shape in which thick portions and thin portions are alternately repeated. In the present embodiment, the insulated wire protection part 23 has a shape in which a plurality (four) of cylinders (discs) with gradually decreasing diameters are stacked. The insulated wire protection part 23 is for suppressing the intrusion of water into the connector 4 following the bending and stress of the cable 1 (insulated wire 2). Further, the insulating wire protection portion 23 includes a portion that projects radially outward from the first outer peripheral surface 11a. For this reason, when the main body 21 is inserted into the receiving hole 4a, it prevents all of the main body 21 from being inserted, similar to the protruding portion 13 described above. Also, in the present embodiment, the insulating wire protection portion 23 has a function of preventing water intrusion, similar to the protruding portion 13 described above.
[0032] (Effect) According to the connection auxiliary tool 20 according to the second embodiment, it is possible to suppress the occurrence of rust on the conductor 2b of the insulated wire 2 connected to the fire detector 3. Also, according to the connection auxiliary tool 20, it is possible to suppress the occurrence of rust on the conductor 2b even if shrink-back occurs in the insulated wire 2.
[0033] [Tape] Next, a tape 30 for winding around the insulated wire 2 to protect a wound on the insulator 2a of the insulated wire 2 will be described. By winding the tape 30 around the insulated wire 2, it is possible to suppress the corrosion (verdigris formation) of the conductor 2b caused by moisture reaching the conductor 2b through the wound on the insulator 2a. FIG. 5A shows a tape 30 for preventing the conductor 2b of the insulated wire 2 from rusting. FIG. 5B is a diagram showing the winding of the tape 30 around the insulated wire 2. As shown in FIGS. 5A and 5B, the tape 30 has a first layer 31, a second layer 32, and a third layer 33 in this order. The thickness of the tape 30 is, for example, 30 μm or more and 1000 μm or less.
[0034] The first layer 31 is a layer that contacts the insulated wire 2 and is the innermost layer. The first layer 31 is preferably made of a resin having a softness that deforms under external pressure. For example, the first layer 31 can be a pressure-sensitive adhesive. Examples of the material of the first layer 31 include silicone, butyl rubber, and the like. The thickness of the first layer 31 is, for example, 2 to 5 when the thickness of the third layer 33 is set to 1.
[0035] The second layer 32 is an intermediate layer disposed between the first layer 31 and the third layer 33. The second layer 32 is joined to the first layer 31 on one side and to the third layer 33 on the other side, integrating the two. The second layer 32 is preferably composed of a resin having an effect of buffering the difference in elongation between the first layer 31 and the third layer 33. Specifically, the second layer 32 preferably has elongation characteristics intermediate between those of the first layer 31 and the second layer 32. Examples of the material of the second layer 32 include polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), and the like. The thickness of the second layer 32 is, for example, 1 to 5 when the thickness of the third layer 33 is taken as 1.
[0036] The third layer 33 is the outermost layer. The third layer 33 is preferably composed of a resin that is strong against tension and stress in order to ensure the tension during winding. Examples of the material of the third layer 33 include polyethylene terephthalate (PET), polyvinyl chloride (PVC), polypropylene (PP), and the like.
[0037] One or more of the first layer 31, the second layer 32, and the third layer 33 may include an aluminum layer or an aluminum vapor-deposited film. Thereby, high waterproof performance can be imparted to the tape 30. As shown in FIG. 5B, when the tape 30 is wound around the insulated wire 2, the two ends of the tape 30 do not have to overlap, or may overlap. After winding the tape 30 around the insulated wire 2, a vinyl tape (polyvinyl chloride tape) may be further wound around the tape 30.
Industrial Applicability
[0038] The connection auxiliary tool according to the embodiment of the present invention is useful for suppressing the generation of rust on the conductor of the insulated wire connected to the fire detector.
Explanation of Symbols
[0039] 1 Cable 2 Insulated wire 2a Insulator 2b Conductor 3 Fire detector 4 Connectors 4a Receiving Hole 5 Ceiling 10, 20 Connection Aids 11, 21 Bodies 11a First Outer Peripheral Surface 12, 22 Through-Holes 12a, 22a First Inner Peripheral Surface 12b Second Inner Peripheral Surface 13 Protruding Portion 22c Third Inner Peripheral Surface 23 Insulated Wire Protection Portion 30 Tape 31 First Layer 32 Second Layer 33 Third Layer
Claims
1. A connection auxiliary tool that is inserted into the receiving hole of the insulating wire of the connector of a fire detector to seal the gap between the receiving hole and the insulating wire, having an elastic main body for insertion into the receiving hole, and a through hole arranged in the main body for insertion of the insulating wire, characterized in that, the main body includes a first outer peripheral surface configured to contact the receiving hole, the through hole includes a first inner peripheral surface configured to contact the insulator of the insulating wire, the connection auxiliary tool.
2. The connection auxiliary tool according to Claim 1, characterized in that the through hole further includes a second inner peripheral surface configured to contact the conductor of the insulating wire.
3. The connection auxiliary tool according to Claim 1, characterized in that the through hole is located at the end on the outlet side opposite to the inlet side where the insulating wire is inserted, and further includes a third inner peripheral surface configured not to contact the insulator of the insulating wire.
4. The connection auxiliary tool according to any one of Claims 1 to 3, wherein the main body further includes an insulating wire protection portion configured to be located outside the connector when the first outer peripheral surface contacts the receiving hole, the thickness of the insulating wire protection portion becomes continuously or intermittently thinner as it moves away from the first outer peripheral surface, or the insulating wire protection portion has a bellows shape, the connection auxiliary tool.
Citation Information
Patent Citations
Water-proof plate for fire alarm
JP2004326261A
Cited By
Hair dryer
US12520921B2