Sound insulation cover

Abstract

To provide a new sound insulation cover which achieves improvement of sealability.SOLUTION: A sound insulation cover includes: a first cover member; and a second cover member which is combined with the first cover member to form an internal space for housing a sound source. The first cover member includes a first butting part and a first magnet embedded in the first butting part. The second cover member includes: the second butting part which contacts with the first butting part; and a magnetic material embedded in the second butting part.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a sound insulation cover.

Background Art

[0002] Patent Document 1 discloses a compressor cover made of resin. This compressor cover includes a first surrounding wall, a second surrounding wall, a hinge portion, and engaging portions respectively disposed on the first surrounding wall and the second surrounding wall.

[0003] The engaging portions of this compressor cover engage with each other in a state where the first surrounding wall and the second surrounding wall surround the compressor.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In such a sound insulation cover, in order to enhance the sound insulation performance, it is preferable to improve the sealing performance between the first surrounding wall and the second surrounding wall.

[0006] An object of the present invention is to provide a novel sound insulation cover with improved sealing performance.

[0007] A sound insulation cover according to one aspect of the present disclosure includes a first cover member and a second cover member that, when combined with the first cover member, forms an internal space for accommodating a sound source. The first cover member includes a first butting portion and a first magnet embedded in the first butting portion. The second cover member includes a second butting portion that abuts against the first butting portion and a magnetic body embedded in the second butting portion.

Effects of the Invention

[0008] According to the sound insulation cover of the present disclosure, a novel sound insulation cover with improved sealing performance can be provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0010] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0011] <First Embodiment> First, with reference to FIGS. 1 to 3, a sound insulation cover according to an embodiment of the present disclosure will be described.

[0012] The sound insulation cover 1 of the present embodiment insulates a sound source which is a machine, an electromechanical device, an electric circuit or other equipment. The sound source is, for example, a compressor mounted on a vehicle.

[0013] As shown in FIG. 1, the sound insulation cover 1 is a hollow body having an internal space S for accommodating the sound source. The sound insulation cover 1 includes a first cover member 2, a second cover member 4 combined with the first cover member 2 to form the internal space S, and a hinge 6 connecting the first cover member 2 and the second cover member 4.

[0014] The first cover member 2 and the second cover member 4 may be formed of an elastic foamed resin. The first cover member 2 and the second cover member 4 may be polyurethane foam (Polyurethane: PU). The first cover member 2 and the second cover member 4 of the present embodiment have an apparent density of approximately 10 kg / m 3 or more and 200 kg / m 3 (JIS K 7222) Hereinafter, the material of the foamed resin has a hardness of 40 N or more and 150 N or less (conforming to JIS K 6400), a tensile strength of 50 kPa or more, an elongation of 90% or more (JIS K 6400), and a compression residual strain of 10% or less, and is formed of polyurethane foam.

[0015] Not limited to this, the foamed resin may be so-called foamed polyethylene, low density polyethylene (Low Density Polyethylene: LDPE), high density polyethylene (High Density Polyethylene: HDPE), or ethylene-vinyl acetate copolymer resin (Ethylen-Vinyl Acetate: EVA).

[0016] The first cover member 2 includes a first peripheral wall 21, an annular first butting portion 22 located at an end of the first peripheral wall 21, and an annular first magnet 23 embedded in the first butting portion 22. In this specification, the term "annular" means an elongated shape with both ends connected.

[0017] FIG. 2 is a cross-sectional view showing the first butting portion 22. As shown in FIG. 2, the first butting portion 22 has a first end face 22a and a recess 22b recessed from the first end face 22a.

[0018] The recess 22b includes a pair of side faces 221 and a bottom face 222 connecting the pair of side faces 221. The distance h1 from the first end face 22a to the bottom face 222 is, for example, 2 mm or more and 10 mm or less.

[0019] The first magnet 23 includes an N pole 23n and an S pole 23s. In the present embodiment, the N pole 23n is directed toward the bottom surface 222 of the recess 22b. The distance d1 from the bottom surface 222 of the recess 22b to the first magnet 23 is, for example, 0 mm or more and 2 mm or less. When the distance d1 is 0 mm, the first magnet 23 is partially exposed on the bottom surface 222 of the recess 22b. When the distance d1 exceeds 0 mm, the first magnet 23 is covered with a foamed resin having a thickness of the distance d1. In the present embodiment, the first magnet 23 is covered with a foamed resin.

[0020] The second cover member 4 includes a second peripheral wall 41, an annular second butting portion 42 located at an end of the second peripheral wall 41, and an annular magnetic body 44 embedded in the second butting portion 42.

[0021] FIG. 3 is a cross-sectional view showing the second butting portion 42. As shown in FIG. 3, the second butting portion 42 has a second end surface 42a and a convex portion 42b protruding from the second end surface 42a.

[0022] The convex portion 42b includes a pair of side surfaces 421 and a top surface 422 connecting the pair of side surfaces 421. The distance h2 from the second end surface 42a to the top surface 422 may be the same as the distance h1 in the first butting portion 22 or may be larger than the distance h1. The distance h2 is, for example, 2 mm or more and 12 mm or less.

[0023] The magnetic body 44 attracts the first magnet 23. The magnetic body 44 is, for example, a metal having magnetism such as iron or nickel or a permanent magnet. The magnetic body 44 in the present embodiment is a second magnet 43 having the same quality as the first magnet 23.

[0024] The second magnet 43 includes an N pole 43n and an S pole 43s. In the present embodiment, the S pole 43s is directed toward the top surface 422. The distance d2 from the top surface 422 of the convex portion 42b to the second magnet 43 is, for example, 0 mm or more and 2 mm or less. When the distance d2 is 0 mm, the second magnet 43 is partially exposed on the top surface 422 of the convex portion 42b. When the distance d2 exceeds 0 mm, the second magnet 43 is covered with a foamed resin having a thickness of the distance d2. In the present embodiment, the second magnet 43 is covered with a foamed resin.

[0025] Next, with reference to FIGS. 1, 4, and 5, the state of closing by butting the first butting portion 22 of the first cover member 2 and the second butting portion 42 of the second cover member 4 will be described. As shown in FIG. 1, the second cover member 4 rotates toward the first cover member 2 (see the black arrow in FIG. 1) and abuts against the first cover member 2.

[0026] FIG. 4 shows a state of butting the first butting portion 22 of the first cover member 2 and the second butting portion 42 of the second cover member 4. FIG. 5 is a graph showing the distance L between the first magnet 23 and the second magnet 43 on the horizontal axis, and the compression stress Fu of the foamed resin forming the first cover member 2 and the second cover member 4 and the magnitude F of the magnetic force Fm generated between the first magnet 23 and the second magnet 43 on the vertical axis.

[0027] As shown in FIG. 4(a), the second cover member 4 is folded back toward the first cover member 2 by the hinge 6 (see FIG. 1), and the second butting portion 42 faces the first butting portion 22 with a gap therebetween. As shown in FIG. 5, the distance L at this time is La, and the magnetic force Fm is Fma. The second magnet 43 is attracted to the first magnet 23, so that the second butting portion 42 approaches the first butting portion 22. Since the second butting portion 42 has not yet reached the first butting portion 22, both the first cover member 2 and the second cover member 4 are in an uncompressed state, and no compression stress Fu is generated in these.

[0028] As shown in FIG. 4(b), as the second magnet 43 is further attracted to the first magnet 23, the second butting portion 42 approaches the first butting portion 22 further. As shown in FIG. 5, the distance L at this time is Lb, and the magnetic force Fm is Fmb which is larger than Fma. Also at this time, both the first cover member 2 and the second cover member 4 are in an uncompressed state, and no compression stress Fu is generated in these.

[0029] As shown in FIG. 4(c), as the second magnet 43 is further attracted to the first magnet 23, the second butting portion 42 comes into contact with the first butting portion 22. As shown in FIG. 5, the distance L at this time is Lc, and the magnetic force Fm becomes Fmc which is greater than Fmb. When the second butting portion 42 comes into contact with the first butting portion 22, a compressive stress Fu is generated.

[0030] As shown in FIG. 4(d), as the second magnet 43 is further attracted to the first magnet 23, the convex portion 42b of the second butting portion 42 and the concave portion 22b of the first butting portion 22 are compressed. As a result, a compressive stress Fu is generated in the first cover member 2 and the second cover member 4.

[0031] As shown in FIG. 5, the distance L at this time is Ld, the magnetic force Fm becomes Fmd which is greater than Fmc, and balances with the compressive stress Fu. As the convex portion 42b of the second butting portion 42 and the concave portion 22b of the first butting portion 22 are compressed and come into contact with each other, the second cover member 4 and the first cover member 2 are closed with good sealing performance.

[0032] In the present embodiment, the concave portion 22b is provided in the first butting portion 22 and the convex portion 42b is provided in the second butting portion 42, but the present disclosure is not limited thereto. The concave portion 22b may be provided in the second butting portion 42, and the convex portion 42b may be provided in the first butting portion 22. Alternatively, the first butting portion 22 may be flat and the second butting portion 42 may also be flat.

[0033] <Second Embodiment> Next, with reference to FIG. 6, the second embodiment of the present disclosure will be described with respect to the differences from the first embodiment. The sound insulation cover 101 of the second embodiment is different from the first embodiment in that the first magnet 123 and the magnetic body 144 are provided discontinuously.

[0034] The first magnet 123 is discontinuously embedded in the first butting portion 122. In the present embodiment, the first magnet 123 is a plurality of bar magnets.

[0035] Further, the magnetic body 144 is discontinuously embedded in the second butting portion 142. In the present embodiment, the magnetic body 144 is a plurality of bar magnets, similar to the first magnet 123.

[0036] When the first magnet 123 and the magnetic body 144 are butted against the first butting portion 122 and the second butting portion 142, it is preferable that they are arranged at positions facing each other.

[0037] As described above, the sound insulation cover 1 (101) of the present disclosure includes a first cover member 2 (102) including a first butting portion 22 (122) and a first magnet 23 (123) embedded in the first butting portion 22 (122), a second butting portion 42 (142), and a second cover member 4 including a magnetic body 44 (144) embedded in the second butting portion 42 (142).

[0038] When the first magnet 23 (123) and the magnetic body 44 (144) attract each other, the first butting portion 22 (122) and the second butting portion 42 (142) are automatically positioned at appropriate positions. As a result, the sealing performance between the first butting portion 22 (122) and the second butting portion 42 (142) is improved, and the sound insulation performance of the sound insulation cover 1 (101) is improved.

[0039] Further, the first butting portion 22 (122) may have a concave portion 22b, and the second butting portion 42 (142) may have a convex portion 42b that fits into the concave portion 22b. Further, the first butting portion 22 (122) may have a convex portion, and the second butting portion 42 (142) may have a concave portion that receives the convex portion.

[0040] When the convex portion 42b fits into the concave portion 22b, displacement between the first cover member 2 (102) and the second cover member 4 (104) is prevented.

[0041] Furthermore, the first cover member 2 (102) and the second cover member 4 (104) are formed of an elastic foamed resin, and the foamed resin may be interposed between the first magnet 23 (123) and the magnetic body 44 (144).

[0042] When the first magnet 23 (123) and the magnetic body 44 (144) attract each other, the foamed resin intervening between the first magnet 23 (123) and the magnetic body 44 (144) elastically deforms. The elastic deformation of the foamed resin reduces the gap between the first butting portion 22 (122) and the second butting portion 42 (142).

[0043] Also, the magnetic body 44 (144) may be a second magnet that attracts the first magnet 23 (123).

[0044] As described above, according to the sound insulation cover of the present disclosure, a novel sound insulation cover with improved sealing performance can be provided.

[0045] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various modifications are possible without departing from the gist of the invention. In particular, a plurality of modification examples described in this specification can be arbitrarily combined as needed.

[0046] For example, the first magnet 123 may be discontinuous as in the second embodiment, and the magnetic body 44 may be annular as in the first embodiment. Conversely, the first magnet 23 may be annular as in the first embodiment, and the magnetic body 144 may be discontinuous as in the second embodiment.

Explanation of reference numerals

[0047] 1(101): Sound insulation cover 2(102): First cover member 4(104): Second cover member 22(122): First butting portion 22b: Concave portion 23(123): First magnet 42(142): Second butting portion 42b: Convex portion 44(43,144): Magnetic body (second magnet)

Claims

1. A first cover member, and a second cover member that forms an internal space for accommodating a sound source when combined with the first cover member, wherein the first cover member includes a first butting portion and a first magnet embedded in the first butting portion, and the second cover member includes a second butting portion that abuts against the first butting portion and a magnetic body embedded in the second butting portion. A sound insulation cover.

2. The first butting portion has a concave portion, and the second butting portion has a convex portion that fits into the concave portion, or the first butting portion has a convex portion, and the second butting portion has a concave portion that receives the convex portion. The sound insulation cover according to Claim 1.

3. The first cover member and the second cover member are formed of an elastic foamed resin, and the foamed resin is interposed between the first magnet and the magnetic body. The sound insulation cover according to Claim 1.

4. The magnetic body is a second magnet that attracts the first magnet. The sound insulation cover according to Claim 1.

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