Air sending machine

Abstract

To provide an air sending machine which has a grommet with an excellent versatility and can secure the airtightness.SOLUTION: The air sending machine includes: a case with an opening; an impeller arranged in the case; a motor arranged in the case, the motor driving the impeller; a grommet arranged in the case; a wire; and a plug member. The grommet has a first hole and a second hole connecting the inside and the outside of the case via the opening. The wire is inserted in the first hole. The plug member blocks the second hole.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a blower.

Background Art

[0002] A blower having a grommet through which wiring is inserted is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The number of wirings used varies depending on the model of the blower. For this reason, it is conceivable to use grommets with different numbers of holes for each model of the blower. However, in this case, it is necessary to manufacture a plurality of types of grommets, which may increase the manufacturing cost. Therefore, it is conceivable to manufacture a grommet provided with the maximum number of wirings that can be used in the blower and the same number of holes, and share this grommet among blowers of different models. This improves the versatility of the grommet. However, when such grommets are made common, the airtightness of the blower may decrease through the unused holes of the grommet. As a result, the blowing efficiency may decrease.

[0005] Therefore, an object of the present invention is to provide a blower having a grommet with excellent versatility and ensuring airtightness.

Means for Solving the Problems

[0006] The above object can be achieved by a blower including a case having an opening, an impeller disposed in the case, a motor disposed in the case for driving the impeller, a grommet disposed in the case, wiring, and a plug member, wherein the grommet has first and second holes communicating the inside and outside of the case through the opening, the wiring is inserted through the first hole, and the plug member closes the second hole.

Advantages of the Invention

[0007] It is possible to provide a blower having a grommet with excellent versatility and ensuring airtightness.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

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Figure 6

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Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0009] [Blower of the First Model] FIG. 1 is a cross-sectional view of a blower 1 of the first model. The blower 1 includes an impeller case 10, a motor case 20, a grommet case 30, a bearing holding member 40, an impeller I, a motor M, a grommet 70, and a plug member 80. The impeller I is housed in the impeller case 10. The motor M is housed in the motor case 20. The grommet 70 is held in the grommet case 30. The impeller case 10 includes an upper case 11 and a lower case 12. At the center of the upper case 11, a suction port 13 for taking in gas into the impeller case 10 is formed. The upper case 11 faces the upper surface side of the impeller I. An annular air passage 14 is defined by a portion of the upper case 11 radially outside the impeller I and the lower case 12. The gas introduced into the air passage 14 through the suction port 13 is discharged from a discharge port (not shown) formed in the impeller case 10. The lower case 12 is assembled to the motor case 20 via a ring-shaped seal member S. The impeller I is fixed to the tip of a rotating shaft 51 described later.

[0010] The bearing holding member 40 includes a cylindrical portion 41 and a flange portion 42. The cylindrical portion 41 and the flange portion 42 face the lower surface side of the impeller I. The cylindrical portion 41 is substantially cylindrical. Inside the cylindrical portion 41, two bearings B for rotatably supporting the rotating shaft 51 are held. The flange portion 42 is fixed to the upper end portion of the cylindrical portion 41. A collar 44 is fixed to the outer peripheral portion of the cylindrical portion 41. A vibration-proof material 45 is disposed between the collar 44 and the lower case 12. A nut 46 is screwed onto the outer peripheral surface of the cylindrical portion 41. The collar 44 and the vibration-proof material 45 are held between the nut 46 and the flange portion 42. The vibration-proof material 45 partitions the space in which the impeller I is housed and the space in which the motor M is housed.

[0011] The motor M includes a rotor 50, a stator 54, coils 55, an insulator 56, and a printed circuit board 57. The rotor 50 includes a rotating shaft 51, a yoke 52, and a magnet 53. The yoke 52 is fixed to the rotating shaft 51. The magnet 53 is held on the outer peripheral portion of the yoke 52. The magnet 53 is cylindrical and magnetized with different polarities in the circumferential direction. The rotating shaft 51, the yoke 52, and the magnet 53 rotate integrally. The stator 54 is disposed radially outside the magnet 53. Each of the plurality of coils 55 is wound around the stator 54 via the insulator 56. The plurality of coils 55 are electrically connected to the printed circuit board 57. The printed circuit board 57 is disposed on the side opposite to the impeller I with respect to the rotor 50, the stator 54, the coils 55, and the insulator 56. Further, as will be described later, a wiring C1 is connected to the printed circuit board 57, and by being connected to an electronic circuit provided outside the motor M via the wiring C1, the energization of the plurality of coils 55 is controlled. By energizing the plurality of coils 55, a magnetic force is generated between the stator 54 and the magnet 53. Thereby, the impeller I rotates together with the rotor 50.

[0012] A wiring C1 is connected to the printed circuit board 57. The wiring C1 supplies power to the motor M. Specifically, the wiring C1 energizes the plurality of coils 55. In FIG. 1, only one wiring C1 is shown, but in this embodiment, three wirings C1 are arranged in the depth direction from the front to the back of the paper surface.

[0013] An opening 21 is formed in a part of the lower side wall of the motor case 20. The grommet case 30 is attached to the motor case 20 so as to cover the opening 21. Three holes h1 are formed in the grommet 70 held in the grommet case 30, which will be described in detail later. The three wirings C1 each pass through the three holes h1. Further, five holes h2 are formed in the grommet 70. The five holes h2 are blocked by the plug member 80. Incidentally, three insertion holes 31 through which the three wirings C1 pass are formed in the grommet 70, and five insertion holes 32 corresponding to the five holes h2 are formed. This will be described in detail later.

[0014] [ grommet and plug member ] Figures 2A and 2B are perspective views of the appearance of the grommet 70. The grommet 70 is made of rubber. The grommet 70 includes an inner surface 71, an outer surface 72, and an outer peripheral surface 73. The inner surface 71 and the outer surface 72 face each other. As shown in FIG. 1, the inner surface 71 faces the inside of the motor case 20, and the outer surface 72 faces the outside of the motor case 20. A rib 74 protruding from the outer surface 72 is formed on the outer peripheral edge of the outer surface 72. A plurality of holes h1, h2, and h3 penetrating the inner surface 71 and the outer surface 72 are formed in the grommet 70. In this embodiment, three holes h1, five holes h2, and two holes h3 are formed in the grommet 70. The diameter of the hole h1 is larger than the diameters of the holes h2 and h3. The diameters of the holes h2 and h3 are substantially the same. The five holes h2 are arranged in the longitudinal direction of the grommet 70. The three holes h1 and the two holes h3 are arranged in the longitudinal direction of the grommet 70 at a different stage from the five holes h2. Incidentally, in the grommet case 30, in addition to three insertion holes 31 corresponding to each of the three holes h1 and five insertion holes 32 corresponding to each of the five holes h2, two insertion holes corresponding to each of the two holes h3 are formed. The insertion holes formed in the grommet case 30 are not limited to this. For example, the insertion holes formed in the grommet case 30 may be in the shape of a long hole corresponding to at least two of the plurality of holes h1, h2, and h3. For example, one long hole-shaped insertion hole corresponding to the three holes h1 and the two holes h3 and one long hole-shaped insertion hole corresponding to the five holes h2 may be formed in the grommet case 30.

[0015] The hole h1 is formed for inserting the wiring C1 for supplying power to the motor M as described above. The hole h2 is not used in the blower 1 of FIG. 1, but is formed for inserting the wiring connected to the position sensor that detects the rotational position of the rotor 50. The hole h3 is not used in the blower 1 of FIG. 1, but is formed for inserting the wiring connected to the temperature sensor that detects the temperature of the motor M. The position sensor is, for example, a Hall element. The temperature sensor is, for example, a thermistor.

[0016] Figures 3A and 3B are external perspective views of the plug members 80 and 80a. The plug member 80 includes five insertion portions 81 and a support portion 82 that supports the five insertion portions 81. The five insertion portions 81 extend parallel to each other at equal intervals. The support portion 82 is formed in a substantially plate shape. The plug member 80a includes two insertion portions 81a and a support portion 82a that supports the two insertion portions 81a. The two insertion portions 81a extend parallel to each other at equal intervals. The support portion 82a connects the proximal ends of the two insertion portions 81a. The plug member 80 closes the hole h2. The plug member 80a closes the hole h3. The plug members 80 and 80a are made of resin. The plug members 80 and 80a are more rigid than the grommet 70.

[0017] Figures 4A and 4B are external perspective views of the grommet 70, the plug members 80 and 80a used in the blower 1 of the first model. The insertion portion 81 of the plug member 80 is inserted into the hole h2 from the inner surface 71 side of the grommet 70. Similarly, the insertion portion 81a of the plug member 80a is inserted into the hole h3 from the inner surface 71 side. Thereby, the holes h2 and h3 of the grommet 70 that are not used in the blower 1 are closed. Therefore, the airtightness of the blower 1 is ensured. Note that since the hole h1 is formed for inserting the wiring C1 for supplying power to the motor M as described above, the hole h1 is not blocked by the plug member. The hole h1 corresponds to the first hole. The holes h2 and h3 correspond to the second holes.

[0018] The support portion 82 is sized such that it cannot be inserted into the hole h2. Similarly, the support portion 82a is sized such that it cannot be inserted into the hole h3. Thereby, as shown in FIG. 1, the removal of the plug members 80 and 80a from the grommet 70 to the outside of the motor case 20 is restricted. Note that in FIG. 1, the plug member 80a is located on the front side of the paper surface.

[0019] Further, the five insertion portions 81 are supported by one support portion 82. Therefore, an operator can hold the support portion 82 and simultaneously insert the five insertion portions 81 into the five holes h2 of the grommet 70. The same applies to the plug member 80a. In this way, workability is ensured.

[0020] Also, the plug members 80 and 80a are made of resin, and the grommet 70 is made of rubber. Therefore, each of the plug members 80 and 80a has higher rigidity than the grommet 70. For this reason, the frictional force between each of the plug members 80 and 80a and the grommet 70 is reduced. Therefore, it is easy to insert the insertion portions 81 and 81a into the holes h2 and h3 of the grommet 70, respectively. In this way, workability is ensured.

[0021] Next, the restriction on the removal of the plug member 80 from the grommet 70 to the inside of the motor case 20 will be described. As a scenario where such removal may occur, for example, when a user of the blower 1 presses the tips of the insertion portion 81 and the insertion portion 81a exposed from the holes h2 and h3 with a pen tip or the like as shown in FIG. 4A. As described above, in order to ensure the airtightness of the blower 1, it is desirable to restrict the removal of the plug member 80 from the grommet 70 to the inside of the motor case 20. In such a case, measures such as bonding the plug member 80 to the grommet 70 with an adhesive can also be considered. However, in a manufacturing site, an adhesive is not preferable in terms of management. Also, depending on the use of the blower, the use of an adhesive may be restricted. Therefore, the blower 1 of the present embodiment has the following structure.

[0022] FIG. 5A and FIG. 5B are explanatory diagrams of the regulation of the removal of the grommet 70 of the plug member 80 from the inside of the motor case 20. On the axial extension line of the hole h2, there is an edge of the printed circuit board 57. Here, the length L1 of the plug member 80 in the axial direction of the hole h2 is longer than the distance L2 from the inner surface 71 of the grommet 70 to the edge of the printed circuit board 57 in the same direction. Therefore, even when the plug member 80 moves from the state where the insertion portion 81 of the plug member 80 is inserted into the hole h2 as shown in FIG. 5A to the inside of the motor case 20, the support portion 82 contacts the edge of the printed circuit board 57 before the plug member 80 falls off from the grommet 70 as shown in FIG. 5B. In this way, the removal of the plug member 80 from the grommet 70 to the inside of the motor case 20 is restricted. Incidentally, in this embodiment, there is no edge of the printed circuit board 57 on the axial extension line of the hole h3. Therefore, when the plug member 80a moves from the state where the insertion portion 81a of the plug member 80a is inserted to the inside of the motor case 20, the support portion 82a may not contact the edge of the printed circuit board 57 and the plug member 80a may be removed from the grommet 70 to the inside of the motor case 20. In such a case, an insulator 56 may be used instead of the printed circuit board 57. For example, a wall may be provided on a part of the insulator 56 so that the insulator 56 is located on the axial extension lines of the holes h2 and h3, or the relative positions of the grommet 70 and the motor M may be changed. In this way, the removal of the plug member from the grommet 70 to the inside of the motor case 20 can be restricted without using an adhesive or the like, and airtightness can be ensured.

[0023] The plug members 80 and 80a have a different lightness of color from the grommet 70. In this embodiment, the colors of the plug members 80 and 80a are black, and the color of the grommet 70 is also black. However, as described above, the lightness is different. Also, as shown in FIG. 4A, the tips of the insertion portions 81 and 81a are exposed from the holes h2 and h3, respectively. For this reason, the tips of the insertion portions 81 and 81a can be visually recognized through the insertion holes 32 and the like of the grommet case 30 holding the grommet 70. Therefore, after the completion of the blower 1, it is easy to check whether the holes h2 and h3 of the grommet 70 are appropriately closed by the plug members 80 and 80a. Note that the colors of the plug members 80 and 80a and the grommet 70 are not limited to black.

[0024] [Blowers of the Second, Third, and Fourth Models] FIG. 6 is a cross-sectional view of the blower 1a of the second model. Only the differences between the blower 1a and the blower 1 will be described. The blower 1a is of a different model from the blower 1. A position sensor 58 for detecting the rotational position of the rotor 50 is provided on the printed circuit board 57a of the motor Ma of the blower 1a. Five wirings C2 are connected to the position sensor 58 via the printed circuit board 57a. The wiring C2 passes through the hole h2 of the grommet 70. Therefore, in the blower 1a, the plug member 80 is not inserted into the hole h2 of the grommet 70.

[0025] FIGS. 7A and 7B are external perspective views of the grommet 70 and the plug member 80a used in the blower 1a of the second model. Since the blower 1a is not provided with a temperature sensor for detecting the temperature of the motor Ma, the hole h3 is closed by the plug member 80a. Thereby, the airtightness of the blower 1a is ensured.

[0026] Figures 8A and 8B are external perspective views of grommet 70 and plug member 80 used in the blower of the third model. The blower of the third model does not have a position sensor for detecting the rotational position of rotor 50, but is provided with a temperature sensor for detecting the temperature of the motor. In this case, only hole h2 of grommet 70 is blocked by plug member 80. Also, the blower of the fourth model is provided with a position sensor and a temperature sensor. Therefore, in the blower of the fourth model, grommet 70 is used without using plug members 80 and 80a.

[0027] As described above, grommet 70 is shared among blowers of multiple models, improving the versatility of grommet 70. Therefore, the manufacturing cost is suppressed as compared with the case of manufacturing dedicated grommets for each model. Note that, as described above, hole h1 is not blocked by the plug member.

[0028] [Modification Examples of Plug Members] Figure 9A is an external perspective view of plug member 80b of the first modification example. Plug member 80b includes one insertion portion 81b and a support portion 82b that supports insertion portion 81b. Insertion portion 81b is cylindrical, and support portion 82b is prismatic. The width of support portion 82b is larger than the diameter of insertion portion 81b. Therefore, support portion 82b is sized such that it cannot be inserted into hole h2 or hole h3.

[0029] Figure 9B is an external perspective view of plug member 80c of the second modification example. Plug member 80c includes six insertion portions 81c and a support portion 82c that supports six insertion portions 81c. At the tip of insertion portion 81c, an enlarged diameter portion 81c1 with an enlarged diameter is formed. When insertion portion 81c is inserted into the hole of the grommet and enlarged diameter portion 81c1 protrudes from the tip of the hole, removal of insertion portion 81c from the hole is restricted. In support portion 82c, a groove portion 82c1 is formed between adjacent insertion portions 81c. An operator can divide support portion 82c by bending support portion 82c around groove portion 82c1.

[0030] The number, size, position, and shape of the holes h1, h2, and h3 are not limited to the examples shown in FIGS. 2A and 2B and the like. The grommet 70 may be provided with holes for inserting wirings for purposes other than the wirings for power supply to the motor and the wirings connected to the position sensor and the temperature sensor. For example, holes for inserting wirings connected to a torque sensor, a speed sensor, an acceleration sensor, a vibration sensor, a pressure sensor, etc. may be provided.

[0031] Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and modifications and changes are possible within the scope of the gist of the present invention described in the claims.

Explanation of Reference Numerals

[0032] 1, 1a Blower 70 Grommet h1, h2, h3 Holes 80, 80a Plug members 81, 81a Insertion portions 82, 82a Support portions

Claims

1. A case having an opening; An impeller disposed within the case; A motor disposed within the case and configured to drive the impeller; a grommet disposed within the case; Wiring and A plug member, The grommet has first and second holes that communicate between the inside and the outside of the case through the opening, The wiring is inserted through the first hole, The plug member closes the second hole.

2. the plug member includes an insertion portion inserted into the second hole, and a support portion having a size such that the insertion portion cannot be inserted into the second hole and supporting the insertion portion, the support portion is located on the inner side of the case relative to the insertion portion, The blower according to claim 1 , wherein insertion of the support portion into the second hole is restricted, thereby restricting removal of the plug member from the second hole to the outside of the case.

3. The blower according to claim 2 , wherein the support portion abuts against a part of the motor, thereby restricting removal of the plug member from the second hole toward the inside of the case.

4. the motor includes a printed circuit board; The blower of claim 3 , wherein a part of the motor is the printed circuit board.

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