Case of air pump and air pump

Abstract

To provide a case of an air pump improved in quietness while suppressing the number of components.SOLUTION: A case 3 of the present disclosure is a case 3 of an air pump 1 that covers a pump portion 2, and the case 3 includes a first case half body 31, a second case half body 32 that fits with the first case half body 31, and one side attachment portion (attachment portion 32A or attachment portion 31A) that is provided on at least one of the first case half body 31 or the second case half body 32 and attaches the air pump 1 to a fixing place, and a portion other than the attachment portion has a curved surface shape.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a case for an air pump and an air pump including the case. [Background technology]

[0002] Patent document 1 discloses an air pump for supplying air, in which the pump body and a pump drive unit for driving the pump body are enclosed in a case, and at least a portion of the case is formed into a multi-wall structure with spaces formed between the walls to suppress noise emission into the space around the pump when the pump is operating.

[0003] Patent Document 1 explains that at least a part of the case has a multi-wall structure with spaces formed between the walls, which makes it possible to suppress noise emission around the pump. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-231746 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the case of Patent Document 1 requires at least three case members to form a multi-wall structure, which poses problems of increased cost, assembly man-hours, and weight due to the increased number of parts.

[0006] The present disclosure has been made in consideration of the above circumstances, and one object of the present disclosure is to provide an air pump case and an air pump that are quieter while reducing the number of parts. [Means for solving the problem]

[0007] The case of the present disclosure is an air pump case that covers a pump unit, The case is the first case half; a second case half that mates with the first case half; a mounting portion on one side of the first case half or the second case half, the mounting portion being provided on at least one of the first case half and the second case half, for mounting the air pump to a fixed location; The case has a curved surface except for the attachment portion. [Effects of the Invention]

[0008] According to the present disclosure, an air pump case and an air pump are provided that have a reduced number of parts and improved quietness. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an air pump according to a first embodiment of the present disclosure. [Figure 2] 2 is a side view of the air pump showing only the case cut along line AA in FIG. 1. FIG. [Figure 3] FIG. 2 is a perspective view of the case cut along line BB in FIG. [Figure 4] FIG. 2 is a perspective view showing the inside of a first case half of the first embodiment according to the present disclosure. [Figure 5] FIG. 2 is a front view of the first case half of the first embodiment according to the present disclosure, as viewed from the air outlet side. [Figure 6] FIG. 2 is a perspective view showing the inside of a second case half of the first embodiment according to the present disclosure. [Figure 7] FIG. 2 is a front view of the second case half of the first embodiment according to the present disclosure, as viewed from the air outlet side. [Figure 8] FIG. 10 is a diagram for explaining the results of a noise reduction test of the air pump according to the present disclosure. [Figure 9] FIG. 10 is a perspective view showing an air pump according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mode for carrying out the present invention (hereinafter referred to as an "embodiment") will be described in detail with reference to the accompanying drawings. It should be noted that the same elements are denoted by the same numbers or symbols throughout the description of the embodiments.

[0011] Furthermore, the dimensional ratios in the drawings differ from the actual dimensional ratios and are merely drawn to make the explanation easier to understand, and do not guarantee that the same parts are drawn to the same dimensions between drawings.

[0012] Furthermore, in the drawings, for ease of viewing, there are cases where only some of the parts having the same attribute are given reference symbols.

[0013] <<First Embodiment>> A case 3 of an air pump 1 and the air pump 1 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 8. FIG.

[0014] The air pump 1 is used, for example, in a pneumatic seat system of a vehicle and is disposed in the backrest of the seat.

[0015] However, the use of the air pump 1 need not be limited to use in pneumatic seat systems for vehicles.

[0016] FIG. 1 is a perspective view showing an air pump 1 according to a first embodiment of the present disclosure. FIG. 2 is a side view of the air pump 1, showing only the case 3 cut along the line AA in FIG.

[0017] As shown in Figure 2, the direction along the longitudinal direction of the case 3 may be referred to as the first direction, and the direction perpendicular to the first direction and in which the first case half 31 and the second case half 32 face each other may be referred to as the second direction.

[0018] Furthermore, the front-to-rear direction on the paper surface of FIG. 2, which is orthogonal to both the first direction and the second direction, may be referred to as a third direction.

[0019] FIG. 3 is a perspective view of the case 3 cut along the line BB in FIG. In FIG. 3, the pump section 2 is omitted from the illustration.

[0020] FIG. 4 is a perspective view showing the inside of the first case half 31 of the first embodiment according to the present disclosure. FIG. 5 is a front view of the first case half 31 of the first embodiment according to the present disclosure, as viewed from the air outlet side.

[0021] FIG. 6 is a perspective view showing the inside of the second case half 32 of the first embodiment according to the present disclosure. FIG. 7 is a front view of the second case half 32 of the first embodiment according to the present disclosure, as viewed from the air outlet side.

[0022] As shown in Figures 1 and 2, the air pump 1 includes a pump section 2 (see Figure 2), a case 3 that covers the pump section 2, and a fixing section 4 (see Figure 2) that fixes the pump section 2 within the case 3.

[0023] [Pump section 2] As shown in FIG. 2, the pump section 2 includes a power section 21 and an air output section 22.

[0024] The power unit 21 is a part that generates power for driving the air output unit 22, and in the first embodiment, a motor (not shown) is used. However, the power unit 21 does not need to be limited to a motor, and may be, for example, a solenoid (also called a solenoid actuator).

[0025] Although FIG. 2 shows only the motor casing 21A, the internal structure may be the same as that of a general motor, and may include, for example, a circular stator having teeth that protrude inward at equal intervals around the circumference, windings (e.g., U-phase winding, V-phase winding, and W-phase winding) wound around the teeth, and a rotor rotatably arranged within the stator.

[0026] The air output section 22 is the part that sends out air, and although not shown, it is equipped with a diaphragm and a power transmission mechanism (so-called crank mechanism) that converts the rotation of the motor into oscillating motion and transmits it to the diaphragm.

[0027] The air output portion 22 also includes a diaphragm and an air outlet 22a provided so as to protrude from a casing 22A that houses the power transmission mechanism.

[0028] [Case 3] As shown in Figures 1 to 3, the case 3 comprises a first case half 31, a second case half 32 that fits onto the first case half 31, an attachment portion 31A (also referred to as the first attachment portion) provided on the first case half 31 for attaching the air pump 1 to a fixed location, and an attachment portion 32A (also referred to as the second attachment portion) provided on the second case half 32 for attaching the air pump 1 to a fixed location.

[0029] For example, the first case half 31 and the second case half 32 are formed from glass fiber reinforced plastic (FRP resin) or the like, which can increase rigidity.

[0030] In addition, since it may be necessary to have only one mounting part for mounting to the fixed location, the case 3 may be provided on at least one of the first case half 31 or the second case half 32 and have a mounting part (mounting part 31A or mounting part 32A) on one side for mounting the air pump 1 to the fixed location.

[0031] Therefore, as in the first embodiment, the case 3 does not need to be limited to having an attachment portion (attachment portion 31A or attachment portion 32A) on one side that is provided on either the first case half 31 or the second case half 32 and that attaches the air pump 1 to a fixed location, and an attachment portion (attachment portion 32A or attachment portion 31A) on the other side that is provided on the other side of the first case half 31 or the second case half 32 and that attaches the air pump 1 to a fixed location.

[0032] Furthermore, as shown in FIG. 4, the case 3 has a first mating surface 31B that mates with a second case half 32 (not shown) provided on the first case half 31, and as shown in FIG. 6, a second mating surface 32B that corresponds to the first mating surface 31B (not shown) provided on the second case half 32.

[0033] In the first embodiment, as shown in FIG. 2, the first case half 31 and the second case half 32 are half-split members that divide the case 3 approximately in half when viewed in a direction (a second direction perpendicular to the first direction) perpendicular to the mating surfaces (the first mating surface 31B and the second mating surface 32B), but they do not need to be limited to half-split members that divide the case 3 approximately in half in this manner.

[0034] For example, the mating surfaces of the first case half 31 and the second case half 32 (first mating surface 31B and second mating surface 32B) may be shifted to either side (upper or lower side in Figure 2) from the position that divides the case 3 approximately in half when viewed in a direction perpendicular to the mating surfaces (second direction perpendicular to the first direction).

[0035] On the other hand, the mounting portion 31A has a first base portion 31aa (see Figures 1 to 5) formed so as to protrude rectangularly from the inside to the outside at approximately the center of the first case half 31, and a first arch portion 31ab (see Figures 1, 2, and 5) provided on the first base portion 31aa.

[0036] As shown in Figure 5, when viewed from the front of the first case half 31 from the air outlet side (front view from the left side of Figure 2), the first arch portion 31ab is provided at both ends of the first base portion 31aa and comprises a pair of first leg portions LG1 extending in a direction away from the first base portion 31aa, and a bridge portion CR1 provided at a position spaced apart from the first base portion 31aa and connecting the pair of first leg portions LG1.

[0037] Furthermore, since the first base portion 31aa has a flat rectangular planar shape, it is prone to vibrations (tremors) that can cause noise, but the addition of structures such as the first arch portion 31ab increases rigidity, thereby suppressing vibrations.

[0038] Here, this vibration suppression effect will be described in more detail with reference to FIG. For example, if the first arch portion 31ab does not exist, the portion that serves as the mounting portion 31A would be the first base portion 31aa in the form of a flat plate alone.

[0039] If we consider that the first base portion 31aa vibrates in this state, the first base portion 31aa will repeatedly move in the vertical direction of the paper (also simply referred to as the vertical direction), and at the same time, its width when viewed in the horizontal direction of the paper (also simply referred to as the horizontal direction) will also become shorter or longer.

[0040] More specifically, when the flat plate-shaped first base portion 31aa moves upward on the paper (also simply referred to as upward), the two ends of the flat plate-shaped first base portion 31aa approach each other when viewed left and right, and the flat plate-shaped first base portion 31aa becomes a gently curved surface that protrudes upward.

[0041] Then, from that state, as the flat, plate-shaped first base portion 31aa moves downward on the paper (also simply referred to as downward), the two ends of the flat, plate-shaped first base portion 31aa, which were close together before, move apart, and after passing through the state of the flat, plate-shaped first base portion 31aa that is not curved as shown in Figure 5, the two ends of the flat, plate-shaped first base portion 31aa move closer together again when viewed from the left to right, and the flat, plate-shaped first base portion 31aa becomes a gently curved surface that protrudes downward.

[0042] In this way, when the first base portion 31aa vibrates, the flat plate-shaped first base portion 31aa alternates between a gently curved state in which it protrudes upward and a gently curved state in which it protrudes downward as described above. However, in order to allow the flat plate-shaped first base portion 31aa to bend upward and downward, it is necessary to allow the ends of the flat plate-shaped first base portion 31aa to move closer to and away from each other.

[0043] Next, keeping in mind that the above-mentioned movement is necessary for the flat plate-like first base portion 31aa to vibrate, a case where the first arch portion 31ab exists will be considered.

[0044] The first arch portion 31ab has a pair of first legs LG1 integrally formed at both ends of the flat plate-shaped first base portion 31aa, which move closer to or farther away from each other when viewed in the left-right direction when the flat plate-shaped first base portion 31aa vibrates.

[0045] In order to allow the two ends of the flat plate-shaped first base portion 31aa to move closer to or apart, which is necessary for the flat plate-shaped first base portion 31aa to vibrate, the pair of first legs LG1 integrally formed at both ends of the first base portion 31aa must be able to move closer to or apart in the same manner when viewed in the left-right direction.

[0046] However, the first arch portion 31ab further includes a bridge portion CR1 that connects the pair of first leg portions LG1 so as to prevent the pair of first leg portions LG1 from approaching or moving away from each other in the left-right direction.

[0047] As a result, the first arch portion 31ab suppresses the movement of both ends of the flat plate-shaped first base portion 31aa toward or away from each other, which is necessary for the flat plate-shaped first base portion 31aa to vibrate.

[0048] As described above, the first arch portion 31ab is structured to increase rigidity so as to suppress the movement of both ends of the first base portion 31aa toward and away from each other, which is necessary when the flat plate-shaped first base portion 31aa vibrates.As a result, the vibration (trembling) of the flat plate-shaped first base portion 31aa, which is a source of noise, is suppressed.

[0049] Furthermore, when in use, the air pump 1 is fixed to a fixed location, thereby further suppressing vibration. Therefore, noise reduction at the attachment portion 31A is improved.

[0050] Similarly, the mounting portion 32A has a second base portion 32aa (see Figures 1 to 3, 6, and 7) formed so as to protrude rectangularly from the inside to the outside at approximately the center of the second case half 32, and a second arch portion 32ab (see Figures 1, 2, and 7) provided on the second base portion 32aa.

[0051] As shown in Figure 7, when viewed from the front of the second case half 32 from the air outlet side, the second arch portion 32ab comprises a pair of second leg portions LG2 provided at both ends of the second base portion 32aa and extending in a direction away from the second base portion 32aa, and a bridge portion CR2 provided at a position spaced apart from the second base portion 32aa and connecting the pair of second leg portions LG2.

[0052] Furthermore, since the mounting portion 32A has the same configuration as the mounting portion 31A, noise reduction is improved in the same way as described for the mounting portion 31A.

[0053] On the other hand, as shown in FIG. 3, the case 3 has a first flange portion 31b that protrudes outward along the first mating surface 31B of the first case half 31 and forms part of the first mating surface 31B, and a second flange portion 32b that protrudes outward along the second mating surface 32B of the second case half 32 and forms part of the second mating surface 32B.

[0054] As can be seen from Figures 4 and 5, the case 3 is provided with a plurality of engaging protrusions 31C arranged along the first flange portion 31b of the first case half 31 and protruding outward from an upper position of the first flange portion 31b, and as can be seen from Figures 3, 6 and 7, a plurality of engaging hole portions 32C arranged along the second flange portion 32b of the second case half 32 and having holes with which the engaging protrusions 31C engage.

[0055] As shown in Figure 7, each engagement hole portion 32C has a pair of engagement legs LG3 that extend outward from an upper position of the second flange portion 32b and then extend toward the first case half 31, and an engagement bridge portion CR3 that connects the pair of engagement legs LG3 so as to form an engaging hole on the inside for the engagement protrusion 31C.

[0056] Therefore, when the first case half 31 and the second case half 32 are aligned such that the first mating surface 31B of the first case half 31 and the second mating surface 32B of the second case half 32 are aligned, the engaging protrusion 31C engages with the hole of the engaging hole portion 32C and becomes one body, forming case 3.

[0057] The opening OP1 formed at the position of the mating surfaces (first mating surface 31B and second mating surface 32B) shown in Figure 3 is an opening for extracting a power cable that supplies power to the power unit 21 (not shown).

[0058] Furthermore, as shown in FIG. 4, the case 3 has a recess 31b1 provided on the first mating surface 31B and formed along the first mating surface 31B, and as shown in FIG. 6, a protrusion 32b1 provided on the second mating surface 32B and accommodated in the recess 31b1 formed along the second mating surface 32B.

[0059] It is to be noted that there is no problem if the recessed portion 31b1 is provided on the second mating surface 32B and the protruding portion 32b1 is provided on the first mating surface 31B.

[0060] Therefore, the case 3 only needs to have a recess 31b1 provided on one of the first mating surface 31B or the second mating surface 32B and formed along the mating surface (first mating surface 31B or second mating surface 32B), and a protrusion 32b1 provided on the other of the first mating surface 31B or the second mating surface 32B and accommodated in the recess 31b1 formed along the mating surface (second mating surface 32B or first mating surface 31B).

[0061] As can be seen from the mating surfaces (first mating surface 31B, second mating surface 32B) shown in Figure 3, when convex portion 32b1 is housed in concave portion 31b1, the gap created between the mating surfaces (first mating surface 31B, second mating surface 32B) forms a curved path (also called a labyrinth structure) rather than a straight line, making it difficult for sound from inside case 3 to leak out through this gap, thereby improving noise reduction.

[0062] As can be seen from FIGS. 1 to 3, the case 3 has a curved surface shape except for the attachment portions (attachment portion 32A, attachment portion 31A).

[0063] More specifically, the main body portion (also referred to as the main body portion) of the case 3, excluding the flange portion (first flange portion 31b and second flange portion 32b), the engagement structure (engagement protrusion portion 31C and engagement hole portion 32C), opening OP1, and opening OP2 for the air discharge structure (see Figures 1 and 2), has a curved shape, except for the mounting portions (mounting portion 32A, mounting portion 31A).

[0064] To explain the shape more specifically, as shown in FIG. 2, the case 3 has a housing space (see area X) for housing the pump section 2 at the center side in the longitudinal direction.

[0065] The main body of the case 3 that forms this storage space (see range X) has a circular ring shape except for the mounting portions (mounting portions 32A, 31A) when viewed in a cross section (cross section shown in FIG. 2) perpendicular to the third direction, centered on the central axis of the case 3 that passes through the center of the opening OP2 (see FIG. 2) for the air outlet structure and extends in a direction (first direction) along the mating surface (second mating surface 32B or first mating surface 31B). The first direction may also be referred to as the longitudinal direction of the case 3.

[0066] The radius of curvature of this annular portion is within the range of 18 mm to 34 mm. The radius of curvature of both the inner and outer surfaces of this annular portion is within the range of 18 mm to 34 mm, but since the outer surface is a circle with a larger diameter, the radius of curvature of the outer surface is naturally greater than the radius of curvature of the inner surface.

[0067] In other words, the case 3 has a curved shape with a radius of curvature ranging from 18 mm to 34 mm, except for the mounting portions (mounting portion 32A, mounting portion 31A) of the main body portion (more specifically, the portion corresponding to the storage space (see range X) that houses the pump portion 2).

[0068] Furthermore, the curved surface portion has high rigidity due to its shape, which contributes to quieter operation.

[0069] The case 3 also has a gripping space outside the accommodation space (outside in the left-right direction in FIG. 2) for receiving a fixing part 4 that fixes the pump part 2 to the case 3, which will be described later.

[0070] This gripping space also has a circular ring shape when viewed in a cross section perpendicular to each first direction along the central axis of the case 3.

[0071] This gripping space is configured in a circular ring shape with the radius of curvature decreasing as it moves outward, which also makes it highly rigid and improves quietness.

[0072] Furthermore, the gripping space that receives the fixing part 4 that fixes the pump part 2 inside the case 3 outside (outside the left and right direction in Figure 2) of the storage space (see range X) has a structure for gripping the fixing part 4 that also functions as a reinforcing rib (see reinforcing rib RB1 and reinforcing rib RB2), making it even more rigid and quieter.

[0073] As described above, in the first embodiment, the case 3 is provided with a plurality of reinforcing ribs RB1 provided at positions corresponding to the gripping space that receives the fixing portion 4 that fixes the pump portion 2 inside the case 3 outside (outside the left-right direction in Figure 2) of the storage space (see range X) of the first case half 31, and a plurality of reinforcing ribs RB2 provided at positions corresponding to the gripping space that receives the fixing portion 4 that fixes the pump portion 2 inside the case 3 outside (outside the left-right direction in Figure 2) of the storage space (see range X) of the second case half 32, and the fixing portion 4 is gripped so as to be sandwiched between the plurality of reinforcing ribs RB1 of the first case half 31 and the plurality of reinforcing ribs RB2 of the second case half 32.

[0074] In addition, as can be seen from Figure 2, even when viewed in a cross section along the central axis of case 3 (a longitudinal cross section of case 3 shown in Figure 2), the parts of case 3 excluding the mounting parts (mounting parts 32A and 31A) have an approximately elliptical curved shape, resulting in a highly rigid shape. In this way, the case 3 has an increased rigidity overall, and is quieter.

[0075] [Fixed part 4] The fixed part 4 includes a first fixed part 41 attached to an end of the power part 21 and a second fixed part 42 attached to the air outlet 22 a of the air output part 22 .

[0076] As shown in FIG. 2, the second fixing part 42 has a through hole for guiding air to the outside, and is attached to the pump part 2 by inserting the air outlet 22a into the through hole.

[0077] On the other hand, a conduit or the like (not shown) that serves as an air flow path is connected to the second fixing portion 42 on the side opposite to the through-hole into which the air outlet 22a is inserted.

[0078] Both the first fixed portion 41 and the second fixed portion 42 are made of an elastic material that absorbs vibrations, such as rubber.

[0079] Furthermore, since the case 3 holds the pump section 2 via the first fixing section 41 and the second fixing section 42 formed from the elastic material, vibrations from the pump section 2 are less likely to be transmitted directly to the case 3. Therefore, from this point of view, it is also very quiet.

[0080] <Test example> Next, the evaluation results of the quietness of the first embodiment will be described with reference to FIG. FIG. 8 is a diagram for explaining the results of a noise reduction test of the air pump 1 according to the present disclosure.

[0081] The left side of Figure 8 shows the appearance of an air pump 1 equipped with the case 3 of the first embodiment, with the test results shown below, and the right side of Figure 8 shows the appearance of an air pump equipped with a conventional case, with the test results shown below.

[0082] In both tests, a sound level meter was placed at the same distance from the air pump, and the sound pressure [dB] was measured when the air pump was operated. The thickness of the case is almost the same for both.

[0083] As shown in FIG. 8, the air pump 1 of the first embodiment has a sound pressure that is 6 dB lower than that of the conventional air pump, and it is clear that quietness has been significantly improved.

[0084] As can be seen from the above explanation, in the first embodiment, the case 3 is formed only from the first case half 31 and the second case half 32, thereby reducing the number of parts while improving quietness.

[0085] <<Second embodiment>> Next, an air pump 1 according to a second embodiment of the present disclosure will be described with reference to FIG. FIG. 9 is a perspective view showing an air pump 1 according to a second embodiment of the present disclosure, and corresponds to FIG. The basic configuration of the air pump 1 of the second embodiment is similar to that of the air pump 1 of the first embodiment. Therefore, the following description will mainly focus on the differences from the air pump 1 of the first embodiment, and a description of the similarities may be omitted.

[0086] In the first embodiment, the case 3 was separated into a first case half 31 and a second case half 32, but in the second embodiment, as shown in Figure 9, the first case half 31 and the second case half 32 are connected by a hinge portion HG so that they can be opened and closed.

[0087] Specifically, the hinge portion HG is provided on one of the mating surfaces (the second mating surface 32B or the first mating surface 31B) that are positioned opposite each other across the central axis of the case 3.

[0088] As described in the first embodiment, the central axis of the case 3 is an axis that passes through the center of the opening OP2 (see Figure 2) for the air outlet structure and extends in a direction (see the first direction in Figure 2) along the mating surface (the second mating surface 32B or the first mating surface 31B), i.e., an axis that is along the longitudinal direction of the case 3.

[0089] Furthermore, since no gap is formed between the first case half 31 and the second case half 32 at the hinge portion HG, sound from inside the case 3 is even less likely to leak out.

[0090] Since no gap is formed at the hinge portion HG, the labyrinth structure formed by the recessed portion 31b1 (see FIG. 3) and the protruding portion 32b1 (see FIG. 3) described in the first embodiment may not be provided.

[0091] The above has been explained based on specific embodiments, but the present disclosure is not limited to the above embodiments, and modifications and improvements to the embodiments are also included within the technical scope of the present disclosure, which will be clear to those skilled in the art from the description of the claims. [Explanation of symbols]

[0092] REFERENCE SIGNS LIST 1 air pump, 2 pump section, 3 case, 31 first case half, 32 second case half, 31A, 32A mounting section, 31B, 32B mating surface, 31b1 recess, 31b2 protrusion

Claims

1. An air pump case that covers a pump unit, The case is the first case half; a second case half that mates with the first case half; a mounting portion on one side of the first case half or the second case half, the mounting portion being provided on at least one of the first case half and the second case half, for mounting the air pump to a fixed location; The case has a curved surface except for the attachment portion.

2. 2. The case according to claim 1, wherein the case is provided on the other of the first case half and the second case half, and includes a mounting portion on the other side for mounting the air pump to a fixed location.

3. The case is a first mating surface provided on the first case half to mate with the second case half; a second mating surface provided on the second case half and corresponding to the first mating surface; a recess provided on one of the first mating surface or the second mating surface and formed along the mating surface; The case according to claim 1 , further comprising: a protrusion provided on the other of the first mating surface or the second mating surface, the protrusion being accommodated in the recess formed along the mating surface.

4. An air pump, The air pump is A case according to any one of claims 1 to 3; and a pump portion housed in the case.

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