Electronic device

Abstract

To provide an electronic device capable of preventing dust accumulation and salt damage on an indoor circuit board stored inside a housing arranged on the indoor side with respect to a partition which separates outdoor and indoor.SOLUTION: With respect to a partition 1 which separates outdoor and indoor, a housing 2 arranged on the indoor side and an indoor circuit board 3 stored inside the housing 2 are provided. Between the inside and the outside of the housing 2, an outside air intrusion path is formed, through which the outdoor air is allowed to enter the inside of the housing 2 through a partition 1. The housing 2 has an exhaust port 15 opened to the indoor. An air passage 35 is provided inside the housing 2. The air passage 35 guides the air, which enters the inside of the housing 2 from the outside air intrusion path, to an exhaust port 15 and blocks aerosol particles in the air from the indoor circuit substrate 3.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to an electronic device in which an indoor circuit board is housed inside a housing disposed on the indoor side with respect to a partition that separates the outdoor and indoor areas.

Background Art

[0002] In doors such as the entrance doors of houses and offices, electric locks that are normally locked and unlocked using an electronic key and, in an emergency such as when the battery of the electronic key runs out, operate the cylinder lock using a mechanical key to lock and unlock have become widespread (for example, Patent Document 1).

[0003] On the other hand, the airtightness of buildings tends to be increased in order to save energy, keep the indoor temperature comfortable, and prevent a decline in heat insulation performance. In the case of a highly airtight indoor environment, in order to discharge indoor water vapor, carbon dioxide, odor components, etc., there is a high need to operate a ventilation fan for 24 hours. In such a situation, after installing a plurality of air inlets dedicated for ventilation, the indoor air is discharged from the ventilation fan and the outside air is sucked in from the air inlets. Here, if the combination of the air inlets and the ventilation fan is not appropriate, outside air will be sucked into the indoor area even through a small gap such as the cylinder lock of the entrance door.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, along roads, in industrial areas, in areas with a lot of yellow sand and pollen, and in areas near the coast, the air contains aerosol particles such as sulfur oxides, nitrogen compounds, dust, yellow sand, pollen, and sea salt fine particles. Such aerosol particles also enter the indoor area through gaps such as the cylinder lock.

[0006] The electric lock of Patent Document 1 is provided with a cover that covers the head of the outdoor cylinder lock, thereby preventing water and dust from entering the keyhole. However, in a situation where ventilation is required, sealing the keyhole of the cylinder lock with a cover complicates the unlocking operation after opening the sealed cover in an emergency such as battery depletion or power outage. Furthermore, since it is necessary to take sealing measures again after unlocking, it cannot be adopted. Simply covering with an unsealed cover can block relatively large dust, but since the suction flow rate is large, it cannot block fine particles such as PM2.5. For this reason, there is a problem that the fine particles sucked indoors adhere to the indoor circuit board and components of the electric lock, causing corrosion damage and the like, resulting in malfunction or failure. In addition, in order to avoid failures due to dust accumulation and corrosion damage, it is conceivable to perform special coating on the indoor circuit board and connector parts, etc., but problems remain in terms of cost and management.

[0007] In view of the above background, the problem to be solved by this invention is to provide an electronic device capable of preventing dust accumulation and corrosion damage on an indoor circuit board housed inside a housing arranged on the indoor side with respect to a partition separating the outdoor and indoor areas.

Means for Solving the Problem

[0008] To achieve the above problem, this invention includes a housing arranged on the indoor side with respect to a partition separating the outdoor and indoor areas, and an indoor circuit board housed inside the housing. In an electronic device in which an outside air intrusion path is formed between the inside of the housing and the outdoor through the partition so that outdoor air can penetrate to the inside of the housing, the housing has an exhaust port open to the indoor, and a ventilation path for guiding the air that has entered from the outside air intrusion path to the exhaust port is provided inside the housing. The ventilation path is provided so as to block aerosol particles in the air with respect to the indoor circuit board. is adopted.

Effect of the Invention

[0009] According to the above configuration, the air that has entered the inside of the housing from the outside air intrusion path is guided through the ventilation path to the exhaust port and discharged indoors, and the aerosol particles contained in the air do not adhere to the indoor circuit board. Therefore, the present invention can prevent dust deposition and salt damage on the indoor circuit board housed inside the housing arranged on the indoor side with respect to the partition that separates the outdoors and the indoors. As a result, there is no need to perform special coating or the like on the indoor circuit board, connector part, etc., and a low-cost electronic device can be provided.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0011] Hereinafter, an electronic device according to an embodiment as an example of the present invention will be described based on the accompanying drawings.

[0012] The electronic device shown in FIG. 1 includes a housing 2 arranged on the indoor side with respect to a partition 1 that separates the outdoors and the indoors, an indoor circuit board 3 housed inside the housing 2, and an electric motor 4 as an electric actuator housed inside the housing 2. Note that the electric actuator is not limited to an electric motor, and a solenoid, a plunger, etc. can be appropriately selected.

[0013] Further, on the outdoor side, an outdoor unit 26 that receives an operation from the outside is further provided. The outdoor unit 26 has an outdoor case 27 fixed to the outdoor side of the partition 1. Inside the outdoor case 27, an outdoor circuit board 28 that communicates with an electronic key and communicates a lock / unlock switching request from the authenticated electronic key to the indoor circuit board 3 is housed.

[0014] Partition 1 is a door that opens and closes the entrance / exit of the building. An engraved lock 7 is arranged in the internal space between the outdoor door panel 5 of Partition 1 and the indoor door panel 6 facing it.

[0015] Through holes 8 and 9 are respectively formed in the outdoor door panel 5 and the indoor door panel 6. The through hole 8 in the outdoor door panel 5 is for transmitting the rotation of the cylinder lock 10 from the outdoor side to the engraved lock 7. The through hole 9 in the indoor door panel 6 is for transmitting the rotation of the electric motor 4 from the indoor side to the engraved lock 7.

[0016] The housing 2 is installed on Partition 1 so as to cover the through hole 9 in the indoor door panel 5. As shown in FIGS. 2 and 3, the housing 2 has a bracket plate 11 that contacts the indoor door panel 6, a cover 12 that is coupled so as to cover the bracket plate 11, an intermediate partition 13 that is arranged inside the cover 12 so as to be located between the bracket plate 11 and the cover 12, and a lid 14 that is detachably attached to the cover 12.

[0017] The bracket plate 11 is coupled to the lock case of the engraved lock 7 shown in FIG. 1 and is installed at a predetermined position on the indoor side with respect to Partition 1. Further, the bracket plate 11 is provided with a first wiring port 41 for passing a cable 43 that electrically connects the outdoor circuit board 28 and the indoor circuit board 3.

[0018] As shown in FIGS. 1 and 2, the cover 12 has upper, lower, left, and right side walls and a front wall that connects the indoor sides of these side walls. An exhaust port 15 that opens downward into the room is provided in the lower side wall of the cover 12.

[0019] The indoor circuit board 3 controls the electric motor 4 in response to a locking / unlocking switching request using an electronic key (not shown). The drive shaft 16 that outputs the forward and reverse rotation of the electric motor 4 protrudes from the motor case 17. The drive shaft 16 is also adapted to output the forward and reverse rotation of a thumb turn 18 arranged outside the cover 12.

[0020] As shown by the dashed line P1 in FIG. 1, the cable 43 passes through the through holes 8 and 9 of the partition 1 to connect the outdoor circuit board 28 and the indoor circuit board 3. As shown in FIG. 4 here, the cable 43 is passed indoors from the opening 46. Here, the opening 46 is an opening area formed by overlapping the first wiring port 41 provided on the bracket plate 11 and the through hole 9 of the indoor side door panel 6 in a state where the panel surface of the indoor side door panel 6, which is the housing mounting surface of the partition 1, is viewed from the front. Further, the cable 43 is laid along the panel plane of the indoor side door panel 6 and is connected to the connector 21 of the indoor circuit board 3. A first sealing material 36 is disposed so as to continuously cover up to a part of the cable 43 laid along the housing mounting surface from the opening 46. The first sealing material 36 is made of a porous material having elasticity and formed in a sheet shape (the detailed shape of the first sealing material 36 will be described later). A 3.45 is disposed on the middle partition 13 so as to press the cable 43 and the upper sealing portion 39 of the first sealing material 36 toward the panel surface side of the indoor side door panel 6. By doing so, the intrusion of aerosol particles in the air is blocked at the opening 46 for passing the cable 43 from the outdoor side to the indoor side.

[0021] On the other hand, the indoor circuit board 3 and the electric motor 4 are arranged vertically side by side between the middle partition 13 and the cover 12 and are connected by a cable 44 as shown by the dashed line P2 in FIG. 1 (see also FIG. 4). The middle partition 13 is screwed inside the cover 12. After this screwing, the cover 12 is placed on the bracket plate 11 installed on the indoor side door panel 6 and is further screwed to the bracket plate 11. Thereby, the housing 2 is arranged at a predetermined position on the indoor side with respect to the partition 1. Note that a second wiring port 42 penetrating the middle partition 13 is formed in the middle partition 13. As shown in FIG. 4, the second wiring port 42 is used to pass the cables 43 and 44 connected to the connectors 20 and 21 of the indoor circuit board 3.

[0022] Between the front wall of the cover 12 and the lid 14, a battery 22 that powers the indoor circuit board 3, the outdoor circuit board 28, and the electric motor 4 is accommodated.

[0023] The drive shaft 16 is inserted through a through hole 23 formed in the partition 13 and is connected to the shaft 24. A shaft hole 25 for inserting the shaft 24 is formed in the bracket plate 11. The shaft 24 transmits the rotation of the drive shaft 16 to the carving lock 7.

[0024] The outdoor case 27 has a cylindrical portion 29 inserted into the through hole 8 of the outdoor side door panel 5. The cylinder lock 10 is fitted into the cylindrical portion 29. The rotor 30 of the cylinder lock 10 is connected to the shaft 24.

[0025] When unlocking or locking using the electronic key or the thumb turn 18, the forward and reverse rotation of the drive shaft 16 by the electric motor 4 or the thumb turn 18 is transmitted to the carving lock 7 via the shaft 24, and the carving lock 7 operates with the transmitted force to switch the unlocking and locking. In case of an emergency such as battery depletion of the electronic key, etc., when unlocking or locking by operating the cylinder lock 10 from the outdoor side with respect to the partition 1 using a mechanical key, the rotation of the rotor 30 is transmitted to the carving lock 7 via the shaft 24, and the carving lock 7 operates with the transmitted force to switch the unlocking and locking. When unlocking or locking by operating the cylinder lock 10 from the outdoor side with respect to the partition 1 using a mechanical key, the rotation of the rotor 30 is transmitted to the carving lock 7 via the shaft 24, and the carving lock 7 operates with the transmitted force to switch the unlocking and locking.

[0026] Normally, the cylinder lock 10 that is not in use is covered by a lock cover 31 that is detachable from the outdoor case 27. A minute fitting gap 32 is formed between the lock cover 31 and the outdoor case 27. Also, a minute fitting gap 33 is formed between the cylinder lock 10 and the cylindrical portion 29. Also, a gap 34 is formed between the shaft 24 and the bracket plate 11. In FIG. 1, these gaps 32 to 34 are drawn exaggeratedly.

[0027] An outside air intrusion path is formed between the inside of the housing 2 and the outside, guiding the outside air to the inside of the housing 2 through the fitting gap 32, the fitting gap 33, the internal space of the partition 1, and the gap 34 in this order.

[0028] Inside the housing 2, there is a ventilation passage 35 that guides the air that has entered the inside of the housing 2 from the gap 34, which is the end of the outside air intrusion path, to the exhaust port 15.

[0029] The ventilation passage 35 is formed by the bracket plate 11, the middle partition 13, a first sealing material 36 that seals the space between the bracket plate 11 and the middle partition 13 against the indoor circuit board 3, the motor case 17, and a second sealing material 37 that seals the space between the middle partition 13 and the motor case 17 against the indoor circuit board 3.

[0030] As shown in FIGS. 1 and 2, the first sealing material 36 is formed in a gate shape having sealing portions 38 on both left and right sides extending in the vertical direction and an upper sealing portion 39 connecting the upper portions of the sealing portions 38 on both left and right sides. The upper sealing portion 39 passes around the shaft 24 and the drive shaft 16 and is located below the second wiring port 42 of the middle partition 13. The sealing portions 38, 38 on both left and right sides are continuous from the lower wall of the cover 12 to the upper sealing portion 39.

[0031] As shown in FIGS. 1 and 3, the second sealing material 37 is formed in a sheet shape surrounding the drive shaft 16.

[0032] The first sealing material 36 and the second sealing material 37 shown in FIG. 1 are formed of a sponge-like porous material having elasticity by mixing rubber-based materials such as urethane rubber (U), nitrile rubber (NBR), silicone rubber (Si, Q), fluororubber (FKM), ethylene propylene diene rubber (EPDM), chloroprene rubber (CR), and butyl rubber (IIR). Note that these sealing materials 36, 37 may be formed of any appropriate material capable of blocking aerosol particles in the air, and are not limited to the above materials.

[0033] The shape of the ventilation path 35 needs to be set in consideration of the flow path resistance (pressure loss) ΔP. For example, in the case of a circular pipe with a diameter d and a pipe length L, ΔP is proportional to L / d. In an actual electronic device, the pipe shape is not necessarily limited to a circular pipe and is often a rectangular shape or the like. In that case, instead of the diameter d, the shape may be evaluated using the equivalent diameter De represented by the following equation. The equivalent diameter De is a representative length indicating the diameter of a circular pipe equivalent to the flow path in terms of fluid flow, and is represented by the following equation. De = 4Af / Wp Here, Af is the cross-sectional area of the flow path, and Wp is the wetted perimeter length (the length of the wall surface in the cross section). Therefore, even if the cross-sectional area Af is large, if the shape is flat and crushed with a large wetted perimeter length Wp, the equivalent diameter De will be small and the flow path resistance ΔP will be large, making it impossible to efficiently discharge the outside air mixed with aerosol particles that have entered from the exhaust port. In an electronic device in a general house, the equivalent diameter De may be 5 mm or more, and the flow path length L (for example, in this embodiment, corresponding to the distance from the drive shaft 16 to the exhaust port 15) may be 100 mm or less. More desirably, De is 7 mm or more and the flow path length L is 70 mm or less.

[0034] Most of the air that has entered the inside of the housing 2 from the gap 34 between the shaft 24 and the bracket plate 11 flows downward through the space surrounded by the first sealing material 36, the middle partition 13, and the bracket plate 11 in the ventilation path 35, and flows out downward from the exhaust port 15. Also, a part of the entered air flows into the portion of the gap 40 between the through hole 23 of the middle partition 13 and the drive shaft 16 in the ventilation path 35. However, since it hits the second sealing material 37 (see also FIG. 3) and the motor case 17 of the electric motor 4 (see also FIG. 2), it will eventually be returned to the space surrounded by the first sealing material 36, the middle partition 13, and the bracket plate 11, flows downward through this space, and flows out downward from the exhaust port 15. Aerosol particles such as sea salt particles and dust contained in the air flowing through the ventilation path 35 are blocked by the first sealing material 36 that adheres to the middle partition 13 and the bracket plate 11, and the second sealing material 37 that adheres to the middle partition 13 and the motor case 17, and cannot leak from either between the middle partition 13 and the bracket plate 11 or between the middle partition 13 and the motor case 17. Also, it cannot pass through the first sealing material 36 and the second sealing material 37 and cannot reach the indoor circuit board 3. Thus, the ventilation path 35 is provided so as to block aerosol particles in the air that has entered the inside of the housing 2 with respect to the indoor circuit board 3.

[0035] As described above, the electronic device shown in FIGS. 1 to 4 has an exhaust port 15 where the housing 2 is open indoors, and a ventilation path 35 that guides the air that has entered from the outside air intrusion path to the exhaust port 15 is provided inside the housing 2. Since the ventilation path 35 is provided so as to block aerosol particles in the air with respect to the indoor circuit board 3, the air that has entered the inside of the housing 2 from the outside air intrusion path is guided to the exhaust port 15 through the ventilation path 35 and is caused to flow out indoors, and the aerosol particles contained in the air do not adhere to the indoor circuit board 3. Therefore, the illustrated electronic device can prevent dust deposition and salt damage on the indoor circuit board 3 housed inside the housing 2 disposed on the indoor side with respect to the partition 1 that separates the outdoor and indoor.

[0036] Further, in the illustrated electronic device, since the exhaust port 15 of the housing 2 is open in a direction away from the indoor circuit board 3 in the housing, the probability that aerosol particles in the air flowing out from the exhaust port 15 re-enter the inside of the housing 2 through the gaps of the cover 12 can be suppressed. In particular, since it is open downward, it can be suppressed from rising into the air indoors.

[0037] Further, in the illustrated electronic device, the partition 1 is a door that can be locked and unlocked from the outdoor side by a cylinder lock 10, an electric motor 4 for lock and unlock switching is accommodated inside the housing 2, and a shaft 24 for transmitting the output of the electric motor 4 is inserted inside the partition 1. The outside air intrusion path communicates with the inside of the housing 2 from the gap 34 between the housing 2 and the shaft 24, and the ventilation path 35 communicates from the gap 34 between the housing 2 and the shaft 24 to the exhaust port 15. Therefore, even in an environment where a 24-hour ventilation fan is operating in a building such as a highly airtight house, apartment, or hotel, while allowing air to be sucked indoors through the ventilation path 35 and the exhaust port 15 from the outside air intrusion path associated with the installation of the cylinder lock 10 and the electric motor 4, dust and salt deposits in the electric circuit such as the indoor circuit board 3 and the wiring connected to the connectors 20 and 21 inside the housing 2 associated with the installation of the electric motor 4 can be eliminated, and malfunctions of the electronic device can be prevented.

[0038] The illustrated electronic device exemplifies an electric lock installed on the door, but the present invention is not limited to the electric lock and can be adopted for an electronic device in which an outside air intrusion path communicating from the outside to the inside of the housing through a partition occurs. For example, an intercom, a door phone, a surveillance camera, etc. can be mentioned.

[0039] It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. Therefore, the scope of the present invention is shown by the claims, and all modifications within the meaning and scope equivalent to the claims are intended to be included.

Explanation of Signs

[0040] 1 Partition 2 Housing 3 Indoor Circuit Board 4 Electric motor (electric actuator) 5 Outdoor door panel 6 Indoor door panel 8, 9 Through-hole 10 Cylinder lock 11 Bracket plate 13 Partition 15 Exhaust port 24 Shaft 32, 33 Fitting gap 34 Gap 35 Vent passage 36 First sealing material 37 Second sealing material 41 First wiring port 42 Second wiring port

Claims

1. An electronic device includes a housing disposed on the indoor side with respect to a partition that separates the outdoors and the indoors, and an indoor circuit board housed inside the housing. In the electronic device, an outside air intrusion path is formed between the inside of the housing and the outdoors through the partition so that outside air can penetrate to the inside of the housing. The housing has an exhaust port that opens downward indoors, and a ventilation path is provided inside the housing to guide the air that has entered from the outside air intrusion path to the exhaust port. The equivalent diameter of the ventilation path represented by the following Equation 1 is 5 mm or more, the flow path length of the ventilation path is 100 mm or less, and the exhaust port side of the ventilation path is provided in a direction away from the indoor circuit board inside the housing. An electronic device characterized by this. Equivalent diameter = 4 × Flow path cross-sectional area of the ventilation path / Wetted edge length of the flow path cross-section of the ventilation path... Equation 1

2. The partition consists of a door that can be locked and unlocked from the outside with a cylinder lock. An electric actuator for lock / unlock switching is housed inside the housing. A shaft for transmitting the output of the electric actuator is inserted inside the partition. The outside air intrusion path communicates with the inside of the housing through a gap between the housing and the shaft. The electronic device according to claim 1, wherein the ventilation path communicates from a gap between the housing and the shaft to the exhaust port.

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