Ventilated housing and ventilation member

Abstract

To improve the durability of ventilated enclosures and ventilation components. [Solution] A ventilated housing is provided in which the repulsive force FO of the seal ring and the bending force FL of each of the multiple legs satisfy equations (1) and (2). FL<33N(1), 0.01≦FO / (n×FL)≦1.5(2) n is the number of legs. The repulsive force FO is the repulsive force of the seal ring when the ventilation member is pushed to the mounting position in the opening, with the tip of the leg removed so that the leg does not come into contact with the housing, and only the seal ring pressed against the inclined surface of the opening. The bending force FL is the bending force of the leg required to flex the leg by pushing the claw from the outer surface side, with the protrusion height of the claw from the outer surface of the leg as the amount of indentation.

Description

【Technical Field】 【0001】 The present invention relates to a ventilation housing including a ventilation member and a housing, and further relates to the ventilation member. 【Background Art】 【0002】 In the housings of in-vehicle electrical components such as lamps, inverters, converters, electronic control units (ECUs), battery packs, radars, and cameras, and various electronic devices for home, medical, office, etc., a ventilation member that secures ventilation between the internal space and the external space of the housing and suppresses the intrusion of foreign matter into the housing may be fixed. The housing has a ventilation member attached to its opening and is used as a ventilation housing. 【0003】 Patent Document 1 discloses a ventilation housing suitable for preventing the intrusion of water sprayed at high pressure assuming a high-pressure car wash test. In the ventilation housing disclosed in Patent Document 1, a tapered opening is provided in the housing, and the ventilation member is attached to the opening with a seal ring pressed against the inclined surface of the opening. The ventilation housing of Patent Document 1 is suitable for maintaining a sealing property against water sprayed at high pressure because the sealing surface between the seal ring and the housing is located inside the opening. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2011-52791 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 There is room for improvement in the durability of a ventilation housing including a ventilation member attached with a seal ring pressed against the inclined surface of the opening of the housing. The present invention provides a ventilation housing and a ventilation member suitable for improving durability. 【Means for Solving the Problems】 【0006】 From one aspect, the present invention, The system comprises a ventilation member and a housing to which the ventilation member is attached at an opening. The aforementioned ventilation member is, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, It includes a sealing ring that seals the space between the housing and the support while in contact with the plurality of legs, At least a portion of the opening is tapered, The sealing ring is pressed against the tapered inner inclined surface of the opening, and the claw portion is in contact with the inner surface of the housing, and the ventilation member is attached to the opening. The repulsive force FO of the seal ring and the bending force FL of the leg satisfy equations (1) and (2). A ventilated enclosure is provided. FL<33N (1) 0.01 ≤ FO / (n × FL) ≤ 1.5 (2) However, n is the number of the aforementioned multiple legs, The aforementioned repulsive force FO is the repulsive force of the seal ring when the ventilation member is pushed to the mounting position in the opening while pressing only the seal ring against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the housing. The bending force FL is the bending force of the leg required to bend the leg by pushing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of indentation. 【0007】 From another aspect, the present invention A ventilation member that can be attached to the opening of the housing, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, The system includes a sealing ring that, when attached to the opening, seals the space between the housing and the support while in contact with the plurality of legs, The repulsive force fo of the seal ring and the bending force FL of the leg satisfy equations (11) and (12). Ventilation component. FL<33N (11) 0.01 ≤ fo / (n × FL) ≤ 1.5 (12) However, n is the number of the aforementioned multiple legs, The aforementioned repulsive force fo is formed on the inner circumference of a tapered surface with a gradient angle of 60 degrees, and whose maximum diameter matches the outer diameter of the seal ring. Pa The repulsive force of the seal ring when the ventilation member is pressed against the inclined surface with only the seal ring pressed against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the test plate, until the distance between the surface of the test plate having a single-shaped opening and the base portion is 0.5 mm. The bending force FL is the bending force of the leg required to bend the leg by pushing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of indentation. [Effects of the Invention] 【0008】 According to the present invention, a ventilated housing and a ventilated member suitable for improving durability are provided. [Brief explanation of the drawing] 【0009】 [Figure 1] Figure 1 is an exploded perspective view showing a ventilation member and a ventilation housing according to one embodiment of the present invention. [Figure 2] Figure 2 is a cross-sectional view of a ventilation member according to one embodiment of the present invention. [Figure 3] Figure 3 is a cross-sectional view of a ventilated enclosure according to one embodiment of the present invention. [Figure 4A] Figure 4A is a cross-sectional view showing the measurement method for the repulsive forces FO and fo of the seal ring. [Figure 4B] Figure 4B, along with Figure 4A, is a cross-sectional view showing the measurement method for the repulsive force FO and fo of the seal ring. [Figure 5] FIG. 5 is a cross-sectional view showing a method for measuring the bending force FL of the leg portion. [Figure 6] FIG. 6 is a diagram showing an example of the relationship between the pushing distance of the ventilation member and the insertion load (repulsive force). [Figure 7A] FIG. 7A is a cross-sectional view schematically showing an initial stage in the operation of pushing the ventilation member into the opening. [Figure 7B] FIG. 7B is a cross-sectional view schematically showing a stage following the stage shown in FIG. 7A. [Figure 7C] FIG. 7C is a cross-sectional view schematically showing a stage following the stage shown in FIG. 7B. [Figure 7D] FIG. 7D is a cross-sectional view schematically showing a stage following the stage shown in FIG. 7C. [Figure 7E] FIG. 7E is a cross-sectional view schematically showing a stage following the stage shown in FIG. 7D. 【MODE FOR CARRYING OUT THE INVENTION】 【0010】 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the following description does not limit the present invention to specific embodiments. 【0011】 FIGS. 1 and 2 show a ventilation member 10 according to an embodiment of the present invention. The ventilation member 10 includes a cover 1, a ventilation film 2, a support 3, and a seal ring 8. In FIG. 1, a state in which each component 1, 2, 3, and 8 constituting the ventilation member 10 is disassembled along the central axis O of the ventilation member 10 is shown. In FIG. 1, a housing 20 having an opening 21 to which the ventilation member 10 is attached is also shown. The ventilation member 10 is attached to the opening 21 and can form a ventilation housing together with the housing 20. The central axis O of the ventilation member 10 coincides with the central axis of the opening 21 whose cross section is circular. 【0012】 As shown in Figure 2, the cover 1 is attached to the support 3 from above so as to cover the ventilation membrane 2. The cover 1 includes a ceiling portion 11 that covers the ventilation membrane 2 and is spaced apart from it, and a wall portion 13 that extends from the periphery of the ceiling portion 11 toward the support 3 and is fitted into the support 3. The wall portion 13 is provided with a notch so that the space 12 between the ventilation membrane 2 and the ceiling portion 11 communicates with the outside. The ventilation membrane 2 is a membrane that allows gas to pass through in the thickness direction, and is attached so as to cover the through-hole 31 of the support 3, and is supported by the support 3 together with the cover 1. The ventilation membrane 2 may be a waterproof ventilation membrane that can prevent water from passing through, and may be a membrane that is both waterproof and oil-repellent. However, the cover 1 is not limited to the shape shown, and the ventilation membrane 2 is not essential. 【0013】 The support 3 includes a base portion 33 and a plurality of legs 35. The base portion 33 has a through hole 31. Each of the plurality of legs 35 extends from the base portion 33. Each of the plurality of legs 35 extends from the base portion 33 around the through hole 31 in the direction in which the through hole 31 extends. The space surrounded by the plurality of legs 35 constitutes a ventilation passage 32 that communicates with the through hole 31. 【0014】 Multiple legs 35 may have the same shape. The number of legs 35 is not limited to the three shown in the figure, but can be two or more. 【0015】 Each of the multiple legs 35 has a claw portion 37. The claw portion 37 protrudes outward from the side opposite to the ventilation passage 32, i.e., from the outer peripheral surface 36 of the leg portion 35. The claw portion 37 is provided at the tip of the leg portion 35. The claw portion 37 may have a contact surface 39 facing the base side of the leg portion 35. 【0016】 The seal ring 8 is attached to the base portion of the multiple legs 35. The seal ring 8 is attached so as to surround the multiple legs 35 from the outside, that is, so that its inner circumferential surface is in contact with the multiple legs 35. The seal ring 8 is positioned so as to be in contact with the outer circumferential surface 36 of the legs 35 as well as the lower surface 34 of the base portion 33. 【0017】 Figure 3 shows a ventilated housing according to one embodiment of the present invention, i.e., a housing 20 to which a ventilation member 10 is attached and which is ventilated. The opening 21 of the housing 20 is tapered in part. The opening 21 may have a tapered inner circumference that decreases in diameter as it moves from the external space 50 side to the internal space 40 side of the housing 20. The entire opening 21 may be tapered, or, as shown in the figure, it may have a straight tubular portion with a uniform inner diameter on the internal space 40 side. The opening 21 may be surrounded by an inclined surface 23 in the tapered portion and surrounded by a vertical surface 28 in the straight tubular portion. 【0018】 The seal ring 8 is compressed between the support 3 and the housing 20, and its repulsive force seals the space between the support 3 and the housing 20. The seal ring 8 is compressed together with the base portion 33 and leg portion 35 of the support 3 while in contact with the inclined surface 23 of the opening 21. To prevent the ventilation member 10 from detaching from the opening 21 due to the repulsive force from the seal ring 8, the claw portion 37, specifically the contact surface 39 of the claw portion 37, is in contact with the inner surface 26 of the housing 20 around the opening 21. The locking of the claw portion 37 holds the ventilation member 10 in the opening 21 of the housing 20 without it falling out. 【0019】 The ventilation member 10 ensures ventilation between the external space 50 and the internal space 40 of the housing 20 through its internal ventilation path, specifically the space 12, ventilation membrane 2, through-hole 31, and ventilation passage 32. The ventilation member 10 provides sealing and ventilation to the opening 21 of the housing 20. 【0020】 Below the base portion 33 of the support 3 side A gap of length LG is maintained between the surface 34 and the outer surface 24 of the housing 20. The length LG of the gap corresponds to the difference between the length LL of the leg portion 35, specifically the length LL from the base of the leg portion 35 to the contact surface 39 of the claw portion 37, and the thickness LB of the wall of the housing 20 (LG = LL - LB). 【0021】 In the ventilation member 10, the diameter DC determined by the tip of the claw portion 37 is greater than the diameter DL determined by the base portion of the claw portion 37 on the outer peripheral surface 36 of the leg portion 35 (DC > DL). Furthermore, the difference between the two corresponds to twice the protrusion height LC of the claw portion 37 from the outer peripheral surface 36 (DC - DL = 2LC). The height LC can also be expressed as the length of the contact surface 39 along the protrusion direction of the claw portion 37. The diameter DC can be set to be smaller than the maximum diameter DH of the opening 21 on the outer surface 24 of the housing 20 (DC <DH)。 【0022】 The absolute difference between the outer diameter DS of the seal ring 8 and the maximum diameter DH of the opening 21 should preferably be 0.6 mm or less, and more preferably 0.3 mm or less. The outer diameter DS and the diameter DH may be the same. 【0023】 The height LC of the claw portion is, for example, 0.8 mm or more and 1.5 mm or less, and more specifically, 1 mm or more and 1.2 mm or less. The gradient angle θ of the inclined surface of the opening 21 may be, for example, 40 degrees or more and 75 degrees or less, and more specifically, 45 degrees or more and 70 degrees or less. The gradient angle θ may also be 60 degrees ± 5 degrees, and more specifically, 60 degrees ± 1 degree. 【0024】 Note that LG, LB, and LL above are the lengths along the central axis O (see Figure 1) of the ventilation member 10 and the opening 21, while the diameters DC, DL, and DH and the height LC are the diameter and length along the direction perpendicular to the central axis O. The gradient angle θ is the angle between the plane perpendicular to the central axis O and the inclined surface 23. 【0025】 The repulsive force from the compressed seal ring 8 allows for the maintenance of sealing at the opening 21. To prevent the intrusion of water sprayed at high pressure, a large repulsive force from the seal ring 8 is desirable. On the other hand, the repulsive force from the seal ring 8 acts on the leg portion 35 as a force that pushes the leg portion 35 toward the central axis, i.e., toward its inner side. In a configuration in which at least a portion of the seal ring 8 is compressed between the outer circumferential surface 36 of the leg portion 35 and the inclined surface 23 of the inner circumference of the opening 21, the bending stress from the seal ring 8 to the leg portion 35 tends to be large. 【0026】 An excessively large repulsive force from the seal ring 8 to the outer surface 36 of the leg portion 35 can cause the ventilation member 10 to detach from the opening 21, for example, if it acts over a long period of time along with temperature changes. To prevent the ventilation member 10 from detaching due to this factor, it is advisable to give the leg portion 35 sufficient rigidity. However, if the rigidity of the leg portion 35 becomes too large, cracks may occur in the leg portion 35 when attaching the ventilation member 10. 【0027】 Processing the leg portion 35 to recess the area where stress is concentrated during insertion, specifically the inner circumferential end of the leg portion 35, has the effect of preventing the occurrence of cracks in the leg portion 35. This processing can be carried out, for example, by chamfering and flattening the inner circumferential end 35e of the leg portion 35. However, even with such processing, it may not be possible to prevent the occurrence of minute cracks. Even if the size of the crack is minute, if temperature changes are applied to the leg portion 35 over a long period of time, it will gradually elongate and can lead to the failure of the leg portion 35. 【0028】 The rigidity of the leg portion 35 can be evaluated using the bending force FL required to press the claw portion 37 and cause the leg portion 35 to bend inward as an indicator. The amount of deformation of the leg portion 35 when the leg portion 35 is attached to the opening 21 can be considered as the protrusion height LC of the claw portion 37. Therefore, it is appropriate to measure the bending force FL with the amount of indentation of the claw portion 37 as the height LC. Details of the method for measuring the bending force FL will be described later. 【0029】 It is desirable to set the bending force FL to less than 33N. A bending force FL within this range is advantageous in preventing microcracks. The bending force FL may be 31N or less, 30N or less, or even 29N or less. The bending force FL may be 18N or more, 20N or more, or 22N or more. For example, the bending force FL may be 20N or more and less than 33N, or even 22N or more and 31N or less. 【0030】 The repulsive force FO (repulsive force when the housing is fixed) and the repulsive force fo (repulsive force when the housing is not fixed) from the seal ring 8 should be appropriately determined while referring to the bending force FL. The repulsive forces FO and fo can be measured as the repulsive force of the seal ring 8 when the ventilation member 10 is pushed in until it is in a position to be attached to the opening 21, while pressing only the seal ring 8 against the inclined surface 23. In this measurement, an evaluation member is used in which the portion of the leg portion 35 on the tip side of the leg portion 35 is cut off from the ventilation member 10 so that the leg portion 35 does not come into contact with the housing 20. The pushing of the ventilation member 10 in this measurement is between the lower surface 34 of the base portion 33 and the outside of the housing 20 Department The process is carried out so that the gap with the side surface 24 extends to length LG. Details of the measurement method for the rebound force FO and fo will be described later. 【0031】 The rebound forces FO and fo should preferably be set according to the bending force FL of the leg 35 and the number n of the legs 35. The rebound forces FO and fo should preferably satisfy the following equations. For simplicity, in the following equations and numerical range descriptions, the rebound forces FO and fo will be collectively referred to as "rebound force FO". 0.01 ≤ FO / (n × FL) ≤ 1.5 n is an integer greater than or equal to 2, for example, an integer in the range of 2 to 8, and may be 2, 3 or 4, or 3. 【0032】 The lower limit of FO / (n×FL) may be 0.014 or greater, 0.02 or greater, 0.05 or greater, 0.07 or greater, and even 0.1 or greater. The upper limit of FO / (n×FL) may be 1.2 or less, 1 or less, and even 0.8 or less. For example, FO / (n×FL) is between 0.02 and 1.2, and also between 0.05 and 1. Another example of FO / (n×FL) is between 0.014 and 1. 【0033】 From the standpoint of preventing the intrusion of water being sprayed at high pressure, the repulsive force FO should preferably be 5N or higher, 7N or higher, and even 9N or higher. 【0034】 However, in applications where the intrusion of high-pressure sprayed water is not necessary, or where the intrusion of high-pressure sprayed water can be prevented by other means, there is little need to increase the repulsive force FO. An example of "other means" to prevent the intrusion of high-pressure water is a protective wall provided on the outer surface 24 of the housing 20 surrounding the ventilation member 10. In such cases, the repulsive force FO may be set to, for example, 0.8N or more and less than 9N, or even 1N or more and 7N or less. 【0035】 The repulsive force FO may be 120N or less, 100N or less, or even 80N or less. When a ventilating member can be inserted without requiring a large pressing force, the repulsive force FO may be 70N or less, 60N or less, 50N or less, even 40N or less, or in some cases 30N or less. 【0036】 The rebound force FO is, for example, between 5N and 120N, between 7N and 100N, and between 7N and 80N. Another example of the rebound force FO is between 0.8N and 70N, and between 1N and 60N. 【0037】 The repulsive forces FO and fo, and the bending force FL can be controlled by the material, shape, and dimensions of the ventilation member 10, and the shape and dimensions of the housing 20, particularly the opening 21. Many factors can influence these forces, but they can be controlled by understanding the relationship between each factor and the force and adjusting that factor. The bending force FL may be influenced by, for example, the protruding height of the claw portion 37. The repulsive forces FO and fo may be influenced by, for example, the hardness of the rubber material constituting the seal ring 8, and the dimensions of each component related to the compressibility of the seal ring 8. 【0038】 The methods for measuring the rebound force FO and fo, and the bending force FL are described below. (Method for measuring the repulsive force FO and fo of a seal ring) As shown in Figure 4A, a test specimen is prepared by cutting and removing the tip of the leg portion 35 from the ventilation member to be measured, leaving the base portion that is in contact with the seal ring 8. This cutting is performed in a way that prevents the leg portion 35 from contacting the inner circumferential surfaces 23 and 28 of the opening 21, while maintaining the support surface of the seal ring 8 provided by the support 3. If the housing to which the ventilation member to be measured should be attached is not specified, that is, when measuring the repulsive force fo, a stainless steel (SUS) plate material with a tapered opening is prepared as a test plate 60 that mimics a desirable housing. In the test plate 60, the opening 21 is designed to be desirable, that is, the gradient angle θ of the inclined surface 23 is set to 60 degrees, and the diameter DH on the insertion side surface 24 of the opening 21 is set to be the same as the outer diameter DS of the seal ring 8. 【0039】 Next, as shown in Figure 4B, the test specimen is pressed against the housing 20 or test plate 60 along the central axis O so that only the seal ring 8 contacts the inclined surface 23 of the opening 21, thereby compressing the seal ring 8. When the length LG of the gap between the lower surface 34 of the base portion 33 of the support 3 and the outer surface 24 of the housing 20 reaches a predetermined value (LL-LB, LL: leg length, LB: thickness of the housing wall), or when the length LG reaches 0.5 mm if the housing to be attached has not been determined and LB cannot be specified, the reaction force from the seal ring 8 in the direction along the central axis O is measured and these are defined as the repulsive forces FO and fo, respectively. Note that "0.5 mm" is also considered a desirable value for a ventilated housing. 【0040】 (Method for measuring the bending force FL of the leg) As shown in Figure 5, the ventilation member 10 to be measured is fixed around the perimeter with a fixing device 71. The fixing of the ventilation member 10 is carried out in a manner that does not hinder the deflection of the leg portion 35. While maintaining the central axis O of the ventilation member 10 to coincide with the horizontal direction, the claw portion 37 is pressed vertically using a compression terminal 72. The pressing surface 73 of the compression terminal 72 is brought into contact with the circumferential center P (see Figure 1) of the claw portion 37. The pressing speed is set to 300 mm / min and the pressing amount to the protrusion height LC of the claw portion 37, and the maximum value of the reaction force from the leg portion 35 is measured and defined as the bending force FL. 【0041】 Characteristics involving repulsive forces FO and fo, as well as bending force FL, include the insertion load required to insert the ventilation member into the opening. Below, an example of the relationship between the indentation distance of the ventilation member and the insertion load will be explained. 【0042】 Figure 6 schematically shows an example of the relationship between the indentation distance of the ventilation member 10 and the insertion load when attaching the ventilation member 10 to the opening 21 of the housing 20. Figures 7A to 7E schematically show the deformation process of the ventilation member 10 during the installation operation. 【0043】 After the ventilation member 10 is pushed in, when the legs 35 of the ventilation member 10 come into contact with the inclined surface 23 of the opening 21 (Figure 7A), the load necessary for insertion, i.e., the insertion load, is generated (Figure 6A). Thereafter, as the amount of deformation of the legs 35 increases with increasing push-in distance, the insertion load gradually increases. In the illustrated example, the opening 21 has a tapered section followed by a section of uniform diameter. Therefore, when the claw section 37 is pushed in to the section of uniform diameter (not shown), the insertion load required for inserting the legs 35 begins to decrease (Figure 6P). 【0044】 Subsequently, when the claw portion 37 engages with the inner surface 26 of the housing 20 and begins to return to the inside (between Figures 7B and 7C), the insertion load required to deform the leg portion 35 decreases further and reaches a minimum value (Figure 6B). If the indentation distance is increased further, the load required to deform the seal ring 8 increases, and the insertion load increases (Figure 6C). 【0045】 However, at this stage, the leg portion 35 is still tilted inward, and the claw portion 37 is not in sufficient contact with the inner surface 26 of the housing 20. Therefore, the pushing of the ventilation member 10 continues. During this pushing process, the ventilation member 10 is pushed in further until the lower surface 34 of the base portion 33 approaches the outer surface 24 of the housing 20, and in some cases, they come into contact with each other. As a result, the leg portion 35 assumes the intended position, and the claw portion 37 makes sufficient contact with the inner surface 26 (Figure 7D). During this extra pushing process, the seal ring 8 is further compressed, and the insertion load increases rapidly (Figure 6D). After that, the pushing load is released, and the installation of the ventilation member 10 is completed (Figure 7E). 【0046】 Because extra pushing is required, the maximum insertion load is more influenced by the repulsive forces FO and fo of the seal ring 8 than by the bending force FL of the leg portion 35. To control the insertion load, it is advisable to adjust the repulsive forces FO and fo. The insertion load decreases significantly when the repulsive forces FO and fo are 30N or less. 【0047】 The following technologies are provided by the above embodiment. (Technology 1) The system comprises a ventilation member and a housing to which the ventilation member is attached at an opening. The aforementioned ventilation member is, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, It includes a sealing ring that seals the space between the housing and the support while in contact with the plurality of legs, At least a portion of the opening is tapered, The sealing ring is pressed against the tapered inner inclined surface of the opening, and the claw portion is in contact with the inner surface of the housing, and the ventilation member is attached to the opening. The repulsive force FO of the seal ring and the bending force FL of the leg satisfy equations (1) and (2). Ventilated enclosure. FL<33N (1) 0.01 ≤ FO / (n × FL) ≤ 1.5 (2) However, n is the number of the multiple legs, and is an integer of 2 or more. The aforementioned repulsive force FO is the repulsive force of the seal ring when the ventilation member is pushed to the mounting position in the opening while pressing only the seal ring against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the housing. The bending force FL is the bending force of the leg required to bend the leg by pushing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of indentation. 【0048】 (Technology 2) The ventilation housing of Technology 1, wherein the aforementioned repulsive force FO further satisfies equation (3). 5N ≤ FO (3) 【0049】 (Technology 3) A ventilated housing of technology 1 or 2, wherein the repulsive force FO further satisfies equation (4). FO≦30N (4) 【0050】 (Technology 4) A ventilated enclosure according to any one of the technologies 1 to 3, satisfying equation (5) instead of equation (2). 0.014 ≤ FO / (n × FL) ≤ 1 (5) 【0051】 (Technology 5) A ventilation member that can be attached to the opening of the housing, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, The system includes a sealing ring that, when attached to the opening, seals the space between the housing and the support while in contact with the plurality of legs, The repulsive force fo of the seal ring and the bending force FL of the leg satisfy equations (11) and (12). Ventilation component. FL<33N (11) 0.01 ≤ fo / (n × FL) ≤ 1.5 (12) However, n is the number of the aforementioned multiple legs, The aforementioned repulsive force fo is formed on the inner circumference of a tapered surface with a gradient angle of 60 degrees, and whose maximum diameter matches the outer diameter of the seal ring. Pa The repulsive force of the seal ring when the ventilation member is pressed against the inclined surface with only the seal ring pressed against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the housing, until the distance between the surface of the test plate having a single-shaped opening and the base portion is 0.5 mm. The bending force FL is the bending force of the leg required to bend the leg by pushing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of indentation. 【0052】 (Technology 6) The ventilation member of technology 5, wherein the aforementioned repulsive force fo further satisfies equation (13). 5N ≤ fo (13) 【0053】 (Technology 7) A ventilation member of technology 5 or 6, wherein the aforementioned repulsive force fo further satisfies equation (14). fo≦30N (14) 【0054】 (Technology 8) A ventilation member from any of the technologies 5 to 7 that satisfies formula (15) instead of formula (12). 0.014 ≤ fo / (n × FL) ≤ 1 (15) 【0055】 This embodiment will be described in more detail below with reference to examples and comparative examples. In the examples and comparative examples, the ventilation members and housings described with reference to Figures 1 to 3 were fabricated to obtain a ventilation housing. The base portion 33 of the ventilation member 10, including the legs 35, was made of polybutylene terephthalate containing glass fibers (Toray Industries, Inc.'s "PBT-GF30"), and the housing 20 was made of stainless steel (SUS). 【0056】 (Example 1) A silicone O-ring was used as the seal ring 8. The O-ring had an outer diameter DS of 11.6 mm, an inner diameter of 7.8 mm, a wire diameter of 1.9 mm, and a Shore hardness A of 70. For the ventilation member 10, the number n of the legs 35 was 3, the length LL of the legs 35 was 4.05 mm, the diameter DC determined by the tip of the claw portion 37 was 10.2 mm, and the outer diameter of the legs 35 was 3. Zhou The diameter DL determined by the surface 36 was 8.0 mm, and the height LC of the claw portion 37 was 1.1 mm. The inner circumference end 35e of the leg portion 35 was flattened. The flattening was carried out so that the end of the flat surface coincided with the outer circumference end 35f of the leg portion 35. For the housing 20, the maximum diameter DH of the opening 21 was 11.5 mm, the gradient angle θ of the inclined surface 23 was 60 degrees, the wall thickness LB of the housing 20 was 3.5 mm, and the length of the vertical surface 28 was 0.7 mm. The compression ratio of the O-ring in Example 1 is 24%. 【0057】 (Example 2) A silicone O-ring was used as the seal ring 8. The O-ring had an outer diameter DS of 11.6 mm, an inner diameter of 7.8 mm, a wire diameter of 1.8 mm, and a Shore hardness A of 70. For the ventilation member 10, the number n of the legs 35 was 3, the length LL of the legs 35 was 4.1 mm, the diameter DC determined by the tip of the claw portion 37 was 10.3 mm, and the outer diameter of the legs 35 was 3. Zhou The diameter DL determined by the surface 36 was 7.9 mm, and the height LC of the claw portion 37 was 1.2 mm. The inner circumference end 35e of the leg portion 35 was flattened. The flattening was carried out so that the end of the flat surface coincided with the outer circumference end 35f of the leg portion 35. For the housing 20, the maximum diameter DH of the opening 21 was 11.6 mm, the gradient angle θ of the inclined surface 23 was 60 degrees, the wall thickness LB of the housing 20 was 3.4 mm, and the length of the vertical surface 28 was 0.6 mm. The compression ratio of the O-ring in Example 2 is 16%. 【0058】 (Example 3) A silicone O-ring was used as the seal ring 8. The O-ring had an outer diameter DS of 11.4 mm, an inner diameter of 7.8 mm, a wire diameter of 2.0 mm, and a Shore hardness A of 70. For the ventilation member 10, the number n of the legs 35 was 3, the length LL of the legs 35 was 4 mm, the diameter DC determined by the tip of the claw portion 37 was 10.1 mm, and the outer diameter of the legs 35 was 4 mm. Zhou The diameter DL determined by the surface 36 was 8.1 mm, and the height LC of the claw portion 37 was 1.0 mm. The inner circumference end 35e of the leg portion 35 was flattened. The flattening was carried out so that the end of the flat surface coincided with the outer circumference end 35f of the leg portion 35. For the housing 20, the maximum diameter DH of the opening 21 was 11.4 mm, the gradient angle θ of the inclined surface 23 was 60 degrees, the wall thickness LB of the housing 20 was 3.6 mm, and the length of the vertical surface 28 was 0.8 mm. The compression ratio of the O-ring in Example 3 is 33%. 【0059】 (Example 4) The seal ring 8 was the same as in Example 2, except that a silicone O-ring with a Shore hardness A of 3 was used. 【0060】 (Comparative Example 1) Except for the fact that the seal ring 8 was made of silicone with a Shore hardness A of 80, the example is as follows: 2 I did the same thing. 【0061】 (Comparative Example 2) The ventilation member 10 was the same as in Example 3, except that the inner circumferential end portion 35e of the leg portion 35 was not flattened. 【0062】 For the examples and comparative examples, the repulsive force FO of the seal ring 8 and the bending force FL of the leg portion 35 were measured using the measurement method described above. In addition, the following tests were conducted. The results are shown in Table 1. 【0063】 (Thermal cycle test) A thermal cycling test was conducted on a test specimen in which the ventilation member 10 was inserted and fixed into the opening 21 of the housing 20. In the thermal cycling test, a cycle of holding the specimen in an atmosphere at -40°C and 125°C for 1 hour each was repeated 500 times. After the test, if the ventilation member 10 was still held in the opening 21, it was considered OK; if it fell out of the opening 21, it was considered NG. 【0064】 (Insertion test / crack resistance) For the test specimen in which the ventilation member 10 was inserted into the opening 21 of the test plate and fixed, the leg portion 35 was observed from the back side of the test plate using a magnifying glass. If no cracks were observed at all, including minute cracks, it was judged as OK; otherwise, it was judged as NG. 【0065】 (Insertion load measurement) The maximum pushing force (insertion load) required to attach the ventilation member 10 to the opening 21 was measured. The pushing speed of the ventilation member 10 was set to 10 mm / min. In this test, pushing was continued until the claw portion 37 of the leg portion 35 was completely locked into the opening of the housing. 【0066】 [Table 1] 【0067】 In Comparative Example 2, very small cracks were observed in the leg portion. Note that in Table 1, the insertion load (N) for Example 4 is a calculated value (3FL) based on the leg bending force FL, not a measured value. However, in Example 4, the leg bending force FL is sufficiently greater than that of the seal ring FO, and it has been confirmed that the insertion load is determined according to FL. Therefore, the measured value of the insertion load is considered to be approximately 81N. [Explanation of symbols] 【0068】 1 cover 2. Ventilated membrane 3 Support 31 Through hole 32 Ventilation channels 33 Base section 34 Lower surface of the base 35 Legs 37. Nail area 39 Contact surface of the claw 8 sealing rings 10 Ventilation components 20 cabinets 21. Opening of the enclosure 23 Slope 28 Vertical plane 40 Interior space 50 Outdoor space 60 test plates

Claims

[Claim 1] The system comprises a ventilation member and a housing to which the ventilation member is attached at an opening. The aforementioned ventilation member is, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, It includes a sealing ring that seals the space between the housing and the support while in contact with the plurality of legs, At least a portion of the opening is tapered, The sealing ring is pressed against the tapered inner inclined surface of the opening, and the claw portion is in contact with the inner surface of the housing, and the ventilation member is attached to the opening. The repulsive force FO of the seal ring and the bending force FL of the leg satisfy equations (1) and (2). Ventilated enclosure. FL < 33N (1) 0.01 ≤ FO / (n × FL) ≤ 1.5 (2) However, n is the number of the aforementioned multiple legs, The aforementioned repulsive force FO is the repulsive force of the seal ring when the ventilation member is pushed to the mounting position in the opening while pressing only the seal ring against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the housing. The bending force FL is the repulsive force of the leg when the leg is bent by pressing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of pressure applied. [Claim 2] The ventilated housing according to claim 1, wherein the repulsive force FO further satisfies formula (3). 5N ≤ FO (3) [Claim 3] The ventilated housing according to claim 1, wherein the repulsive force FO further satisfies formula (4). FO ≤ 30N (4) [Claim 4] A ventilated housing according to claim 1, wherein formula (5) is satisfied instead of formula (2). 0.014 ≤ FO / (n × FL) ≤ 1 (5) [Claim 5] A ventilation member that can be attached to the opening of the housing, A support comprising a base portion having a through hole, and a plurality of legs extending from the base portion so as to surround a ventilation passage communicating with the through hole, wherein each of the plurality of legs has a claw portion protruding from the outer surface of the leg, The system includes a sealing ring that, when attached to the opening, seals the space between the housing and the support while in contact with the plurality of legs, The repulsive force fo of the seal ring and the bending force FL of the leg satisfy equations (11) and (12). Ventilation component. FL<33N (11) 0.01 ≤ fo / (n × FL) ≤ 1.5 (12) However, n is the number of the aforementioned multiple legs, The aforementioned repulsive force fo is the repulsive force of the seal ring when the ventilation member is pressed against the inclined surface, with the tip of the leg removed so that the leg does not come into contact with the test plate, until the gap between the surface of the test plate, which has a tapered opening with a gradient angle of 60 degrees formed on its inner circumference and whose maximum diameter matches the outer diameter of the seal ring, and the base portion is 0.5 mm. The bending force FL is the repulsive force of the leg required to bend the leg by pushing the claw portion from the outer circumferential surface side, with the protrusion height of the claw portion from the outer circumferential surface being the amount of indentation. [Claim 6] The ventilation member according to claim 5, wherein the repulsive force fo further satisfies formula (13). 5N ≤ fo (13) [Claim 7] The ventilation member according to claim 5, wherein the repulsive force fo further satisfies formula (14). fo ≤ 30N (14) [Claim 8] The ventilation member according to claim 5, wherein formula (15) is satisfied in place of formula (12). 0.014 ≤ fo / (n × FL) ≤ 1 (15)

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