Drainage pump

Abstract

A drainage pump is provided with: a rotating blade; a lower cover (cover); a housing which constitutes a pump chamber for accommodating the rotating blade together with the lower cover, and which is coupled to the lower cover in the axial direction (X) of the rotating blade by means of a snap; an annular O-ring (sealing member); and a housing part which is provided on the outside of the pump chamber in the radial direction of the rotating blades, is configured from a cover and a housing, houses the O-ring, and has a conical inner surface, an outer peripheral surface, and a lower surface (pressing part) which press the O-ring in the axial direction (X) and the radial direction (R).

Description

Technical Field

[0001] The invention relates to a drainage pump. Background Art

[0002] In a drainage pump, a structure is disclosed in which a rotary blade that sucks up water and discharges it to the outside by rotating a motor is accommodated in a pump chamber, and a cover and a housing that constitute the pump chamber are connected to each other by snaps (refer to Japanese Patent Publication No. 2010-275972 and Japanese Patent Publication No. 2013-167234). The watertightness between the cover and the housing is ensured by a sealing member (O-ring).

[0003] Technical problem to be solved by the invention

[0004] The buckle is a structure in which the cover and the housing are engaged in the axial direction of the rotating blade (pump body). Here, if the sealing component is a structure in which the cover and the housing are abutted only in the radial direction of the housing, the reaction force of the sealing component will not act in the axial direction, so the relative movement of the cover and the housing in the axial direction cannot be suppressed by the sealing component. In addition, if there is an axial gap in the buckle part, when vibration is generated due to the rotation of the motor, contact sound may be generated from the buckle part. Summary of the invention

[0005] An object of the present invention is to suppress the generation of contact sound from a buckle portion in a drain pump.

[0006] Technical means for solving technical problems

[0007] The drainage pump involved in the first embodiment comprises: a rotating blade; a cover; a housing, the housing and the cover together constitute a pump chamber for accommodating the rotating blade, the housing is connected to the cover in the axial direction of the rotating blade by a snap; an annular sealing component; and a receiving portion, the receiving portion is outside the pump chamber in the radial direction of the rotating blade, is composed of the cover and the housing, and accommodates the annular sealing component, the receiving portion has a pressing portion for pressing the sealing component in the axial direction and the radial direction.

[0008] In the drainage pump, a sealing component that seals between the cover and the housing is accommodated in a receiving portion. The receiving portion has a pressing portion that presses the sealing component in the axial direction and radial direction of the rotating blade. That is, the sealing component is pressed and clamped in the axial direction and radial direction of the rotating blade by the pressing portion. As a result, the relative movement of the cover and the housing in the axial direction and radial direction of the rotating blade can be suppressed. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle part can be suppressed.

[0009] According to a second aspect, in the drain pump according to the first aspect, the pressing portion is provided at a plurality of locations in a circumferential direction along a rotation direction of the rotary blade.

[0010] According to a third aspect, in the drain pump according to the first aspect, the pressing portion is provided over the entire circumferential region along the rotation direction of the rotary blade.

[0011] In the drainage pump, a sealing component that seals between the cover and the housing is accommodated in a housing. The housing has a pressing portion that presses the sealing component in the axial direction and radial direction of the rotating blade in the entire area along the circumference of the rotating blade. That is, the sealing component is pressed and clamped in the axial direction and radial direction of the rotating blade by the pressing portion in the entire circumferential area of ​​the housing. As a result, the relative movement of the cover and the housing in the axial direction and radial direction of the rotating blade can be suppressed. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle part can be suppressed.

[0012] According to a fourth aspect, in the drain pump according to any one of the first to third aspects, at least one of a portion of the cover constituting the pressing portion and a portion of the casing constituting the pressing portion has a tapered surface.

[0013] In this drainage pump, the sealing member can be pressed in the axial direction and radial direction of the rotary blade by the conical surface.

[0014] The fifth embodiment is that in the drain pump involved in the fourth embodiment, the part of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction, the part of the shell constituting the pressing portion has a conical inner surface opposite to the outer peripheral surface and the lower surface, and the sealing part abuts against the outer peripheral surface, the lower surface and the conical inner surface.

[0015] In the drainage pump, the sealing member contacts the outer peripheral surface and lower surface of the cover and the conical inner surface of the housing, thereby suppressing the relative movement of the cover and the housing in the axial and radial directions of the motor. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle portion can be suppressed.

[0016] The sixth embodiment is that in the drain pump involved in the fourth embodiment, the part of the shell constituting the pressing portion has an inner circumferential surface along the axial direction and an upper surface intersecting the axial direction, the part of the cover constituting the pressing portion has a conical outer surface opposite to the inner circumferential surface and the upper surface, and the sealing part abuts against the inner circumferential surface, the upper surface and the conical outer surface.

[0017] In the drainage pump, the sealing member contacts the inner circumferential surface and the upper surface of the housing and the conical outer surface of the cover, thereby suppressing the relative movement of the cover and the housing in the axial and radial directions of the motor. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle part can be suppressed.

[0018] The seventh aspect is that, in the drain pump involved in any one of the first aspect to the third aspect, the portion of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction, the portion of the shell constituting the pressing portion has an inner peripheral surface along the axial direction and an upper surface intersecting the axial direction, and the sealing component is formed in a cross-section and abuts against the outer peripheral surface, the lower surface, the inner peripheral surface and the upper surface.

[0019] In the drainage pump, the sealing member having a cross-shaped cross section abuts against the outer peripheral surface and lower surface of the cover and the inner peripheral surface and upper surface of the cover, thereby suppressing the relative movement of the cover and the housing in the axial direction and radial direction of the motor. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle part can be suppressed.

[0020] The eighth aspect is that, in the drain pump involved in any one of the first aspect to the third aspect, the portion of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction, the portion of the shell constituting the pressing portion has an inner peripheral surface along the axial direction and an axial dimension smaller than that of the outer peripheral surface, and an upper surface intersecting the axial direction, the sealing component abuts against the outer peripheral surface, the lower surface, the inner peripheral surface and the upper surface, and a space is provided between the cover and the shell to allow deformation of the sealing component caused by thermal expansion.

[0021] In the drainage pump, the sealing member is in contact with the outer peripheral surface and lower surface of the cover and the inner peripheral surface and upper surface of the cover, thereby suppressing the relative movement of the cover and the housing in the axial direction and radial direction of the motor. Therefore, even if vibration is generated due to the rotation of the motor, the generation of contact sound from the buckle part can be suppressed. In addition, the space provided between the cover and the housing can allow deformation of the sealing member due to thermal expansion.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to suppress the generation of contact sound from the buckle portion in the drain pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view showing the drain pump according to the first embodiment.

[0025] Figure 2 It is an exploded front view showing the drain pump according to the first embodiment.

[0026] Figure 3 It is an enlarged cross-sectional view showing a mounted state of the O-ring according to the first embodiment.

[0027] Figure 4 It is an enlarged cross-sectional view showing a mounted state of an O-ring according to a second embodiment.

[0028] Figure 5 It is an enlarged cross-sectional view showing a mounted state of an O-ring according to a third embodiment.

[0029] Figure 6 It is an enlarged cross-sectional view showing a mounted state of an O-ring according to a fourth embodiment.

[0030] Figure 7 It is an enlarged cross-sectional view showing a mounted state of an O-ring according to a fifth embodiment.

[0031] Figure 8 It is an enlarged cross-sectional view showing a mounted state of an O-ring according to a sixth embodiment. DETAILED DESCRIPTION

[0032] Hereinafter, the method for implementing the present invention will be described based on the drawings. The components represented by the same symbols in the drawings are the same or similar components. In addition, in the embodiments described below, repeated descriptions and symbols are sometimes omitted. In addition, the drawings used in the following description are all schematic, and the relationship between the dimensions of the elements shown in the drawings, the ratio of the elements, etc. may not necessarily correspond to the actual attached drawings. Figure 1 Furthermore, the relationship between the dimensions of the elements, the ratios of the elements, etc., may not necessarily be consistent among the multiple drawings.

[0033] In the drawings, the arrow X direction indicates the axial direction of the motor 16 described later, and the arrow R direction indicates the radial direction of the motor 16. In the present embodiment, the axial direction of the motor 16 is the same as the axial direction of the rotary blade 51 described later and the vertical direction of the drainage pump 1, and the radial direction of the motor 16 is the same as the radial direction of the rotary blade 51. In the vertical direction, the cover 10 side described later is the upper direction, and the suction port 18 side of the housing 12 described later is the lower direction.

[0034] [First embodiment]

[0035] exist Figures 1 to 4 In the embodiment, the drain pump 1 involved in this embodiment is used to suck up the drain water accumulated in the drain pan and drain it to the outside. The drain pump 1 has a motor unit 15 and a pump body 50. The drain pump 1 drives the pump body 50 through the motor unit 15 to suck up water and drain the water. In this embodiment, the drain pump 1 has a cover 10. The cover 10 constitutes a part of the motor unit 15 and constitutes a part of the pump body 50. The cover 10 has an upper cover 30 and a lower cover 20. The upper cover 30 constitutes a part of the motor unit 15. The lower cover 20 constitutes a part of the pump body 50.

[0036] The motor unit 15 includes a motor 16 and an upper cover 30 that accommodates the motor 16 .

[0037] The pump body 50 includes a rotary blade 51 , the lower cover 20 , the housing 12 , an O-ring 14 as an example of a sealing member, and a housing portion 40 .

[0038] The lower cover 20 is an example of an open cover provided at the upper end of the housing 12. The lower cover 20 is, for example, a bottomed cylindrical synthetic resin component mounted on the upper portion (upper opening) of the housing 12 via an O-ring 14. The bottom of the lower cover 20 constitutes the upper surface of the pump chamber. The lower cover 20 is provided with a snap-fit ​​portion 22B, which is snap-fitted with a snap arm 22A provided on the housing 12. The lower cover 20 is mounted on the housing 12 in a removable manner by a snap-fit ​​function utilizing the elastic force of the snap arm 22A.

[0039] The motor 16 composed of a stator and a rotor is mounted on the upper part of the lower cover 20. The wire drawing portion 24 for drawing a wire from the motor 16 is exposed to the outside. The drive shaft of the motor 16 is connected to the rotation shaft of the rotary vane 51 arranged in the pump chamber 21. A hole for arranging a transmission member that transmits the rotation of the motor 16 to the rotary vane 51 is formed at the bottom of the lower cover 20.

[0040] An upper cover (also referred to as a motor cover) 30 made of synthetic resin and having a short cylindrical shape with a top is mounted on the upper part (opening at the upper part) of the lower cover 20 to cover the upper side of the motor 16. The upper cover 30 is detachably mounted on the lower cover 20 by a snap function utilizing the elastic force of snap arms 26 provided on the upper cover 30. The upper cover 30 is provided with a plurality of mounting portions 28 for mounting the drain pump 1 at the mounting position.

[0041] The housing 12 is connected to the lower cover 20 in the axial direction X of the motor 16 by a buckle 22, and is a component made of, for example, synthetic resin, constituting the pump chamber. The housing 12 accommodates a rotary blade 51. The rotary blade 51 is driven and rotated by the motor 16, thereby sucking up water and discharging it to the outside. The housing 12 is formed with a tubular suction port 18 provided at the lower part of the pump chamber and a tubular discharge port 19 extending from the pump chamber toward the side.

[0042] The buckle arm 22A is provided at multiple locations in the circumferential direction of the upper edge of the housing 12. The buckle arm 22A has a claw portion that can be elastically displaced in order to enable the lower cover 20 to be engaged with the engaged portion 22B and to release the engagement. The buckle 22 is formed by the buckle arm 22A and the engaged portion 22B of the lower cover 20.

[0043] exist Figure 3In the figure, the O-ring 14 is a member which is pressed and held by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R of the motor 16 , respectively, and seals between the lower cover 20 and the housing 12 .

[0044] The housing 12 and the lower cover 20 thus configured have a recessed structure. As the recessed structure, the lower cover 20 has a cylindrical portion 41 on, for example, the outer peripheral side of the lower surface 20B. The outer peripheral portion of the housing 12 is configured so that the cylindrical portion 41 can be arranged in a state where the lower cover 20 is mounted on the housing 12 and the pump chamber 21 is formed. The housing 12 has, for example, a recessed portion 42 as a structure in which the cylindrical portion 41 can be arranged.

[0045] The housing portion 40 is formed of the housing 12 and the lower cover 20 on the outer side of the pump chamber 21 in the radial direction of the rotary blade 51, and is a portion for housing the O-ring 14. The housing portion 40 is, for example, provided in a recessed portion as a portion where a recessed structure is provided. The housing portion 40 includes, for example, a cylindrical portion 41 and its surroundings provided on one of the lower surface 20B of the lower cover 20 and the upper surface 12B of the housing 12, and an annular recessed portion 42 provided on the other side and housing a part or all of the cylindrical portion 41. In the present embodiment, as an example, the cylindrical portion 41 is formed on the lower surface 20B of the lower cover 20, and the recessed portion 42 is formed on the upper surface 12B of the housing 12. In the present embodiment, the recessed portion 42 is formed by the upper edge of the housing 12 and the space inside thereof. When the lower cover 20 is assembled to the housing 12, the cylindrical portion 41 of the lower cover 20 is arranged inside the upper edge of the housing 12 as the recessed portion 42. The upper surface 12B of the housing 12 is a surface facing the lower cover 20 in the axial direction X of the electric motor 16 .

[0046] The housing portion 40 has, for example, a pressing portion for pressing the O-ring 14 in the axial direction X and the radial direction R at at least three locations in the circumferential direction along the rotation direction of the rotary blade 51. Moreover, the housing portion 40 presses the O-ring 14 in the radial direction R between two pressing portions that are adjacent in the circumferential direction among the at least three locations of the pressing portions. That is, the housing portion 40 presses the O-ring 14 in the radial direction R over the entire circumferential region along the rotation direction of the rotary blade 51. In this way, the housing portion 40 presses the O-ring 14 in the radial direction R over the entire circumferential region along the rotation direction of the rotary blade 51, and water is stopped between the housing 12 and the lower cover 20 by the O-ring 14. Moreover, the housing portion 40 presses the O-ring 14 in the axial direction X at at least three locations in the circumferential direction. Alternatively, the entire circumferential region of the housing portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion. In the present embodiment, the housing portion 40 is configured as a pressing portion over the entire circumferential region along the rotation direction of the rotary blade 51.

[0047] As an example of a pressing portion, the portion of the lower cover 20 that constitutes the accommodating portion 40 has an outer peripheral surface 20A of the cylindrical portion 41 and a lower surface 20B that intersects the axial direction X. The outer peripheral surface 20A is, for example, a surface along the axial direction X. The outer peripheral surface 20A is, for example, parallel to the axial direction X. As an example, the outer peripheral surface 20A is orthogonal to the lower surface 20B. The lower surface 20B of the lower cover 20 is a surface that is opposite to the housing 12 in the axial direction X of the motor 16.

[0048] In addition, as an example of a pressing portion, the portion of the housing 12 constituting the accommodating portion 40 has a conical inner surface 12C that is opposite to the outer peripheral surface 20A and the lower surface 20B of the lower cover 20. The conical inner surface 12C is the inner peripheral surface of the recess 42 and is continuous in the circumferential direction along the rotation direction of the rotary blade 51. The conical inner surface 12C constitutes a part of the recess 42.

[0049] The O-ring 14 contacts the outer peripheral surface 20A and the lower surface 20B of the lower cover 20 and the conical inner surface 12C of the housing 12. The reaction force F1 acts on the conical inner surface 12C of the housing 12 from the O-ring 14. The reaction force F1 can be decomposed into a component force F1x in the axial direction X and a component force F1r in the radial direction R. That is, the reaction forces in the axial direction X and the radial direction R act on the housing 12 from the O-ring 14.

[0050] In addition, a reaction force F2r in the radial direction R acts on the outer peripheral surface 20A of the lower cover 20 from the O-ring 14. A reaction force F2x in the axial direction X acts on the lower surface 20B of the lower cover 20 from the O-ring 14. That is, reaction forces in the axial direction X and the radial direction R act on the lower cover 20 from the O-ring 14.

[0051] In this way, the O-ring 14 is pressed and clamped by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R, respectively.

[0052] In the axial direction X, a gap S is formed between the lower cover 20 and the housing 12. By forming the gap S in this portion, the gap in the axial direction X between the buckle arm 22A and the engaged portion 22B in the buckle 22 is reduced (see Figure 1 ).

[0053] (effect)

[0054] This embodiment is constructed as described above, and its function will be described below. Figure 3In the drainage pump 1 involved in the present embodiment, the O-ring 14 that seals between the lower cover 20 and the housing 12 is accommodated in the accommodation portion 40. The entire circumferential area of ​​the accommodation portion 40 along the rotation direction of the rotating blade 51 is configured as a pressing portion that presses the O-ring 14 in the axial direction X and radial direction R of the rotating blade 51. That is, the O-ring 14 is pressed and clamped by the lower cover 20 and the housing 12 in the axial direction X and radial direction R in the entire circumferential area in the accommodation portion 40. Specifically, the O-ring 14 abuts against the outer peripheral surface 20A and the lower surface 20B of the lower cover 20 and the conical inner surface 12C of the housing 12. In addition, the gap in the axial direction X between the snap arm 22A and the engaged portion 22B in the snap 22 can be suppressed, that is, the shaking can be suppressed. Therefore, the relative movement of the lower cover 20 and the housing 12 in the axial direction X and radial direction R can be suppressed. Therefore, even if vibration is generated due to the rotation of the motor 16 , the generation of contact sound from the buckle 22 portion can be suppressed.

[0055] [Second embodiment]

[0056] Figure 4 A second embodiment of the drain pump 2 is shown. In this embodiment, the entire circumferential region of the housing portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion, and the O-ring 14 is pressed in the axial direction X and the radial direction R over the entire circumferential region.

[0057] exist Figure 4 In the drainage pump 2 involved in the present embodiment, as an example of a pressing portion, the housing 12 has an inner circumferential surface 12A of a recess 42 and an upper surface 12B intersecting the axial direction X. The inner circumferential surface 12A is, for example, along the axial direction X. The inner circumferential surface 12A is, for example, parallel to the axial direction X. The inner circumferential surface 12A and the upper surface 12B are, for example, orthogonal. The inner circumferential surface 12A and the upper surface 12B constitute the recess 42. As an example of a pressing portion, the lower cover 20 has a conical outer surface 20C of a cylindrical portion 41 opposite to the inner circumferential surface 12A and the upper surface 12B. The O-ring 14 abuts against the inner circumferential surface 12A, the upper surface 12B, and the conical outer surface 20C.

[0058] The reaction force F2 acts on the conical outer surface 20C of the lower cover 20 from the O-ring 14 . The reaction force F2 can be decomposed into a component force F2x in the axial direction X and a component force F2r in the radial direction R. That is, the reaction forces in the axial direction X and the radial direction R act on the lower cover 20 from the O-ring 14 .

[0059] The O-ring 14 also acts a reaction force F1r in the radial direction R on the inner peripheral surface 12A of the housing 12. The O-ring 14 also acts a reaction force F1x in the axial direction X on the upper surface 12B of the housing 12. That is, the O-ring 14 acts on the lower cover 20 with reaction forces in the axial direction X and the radial direction R.

[0060] In this way, the O-ring 14 is pressed and held in the axial direction X and the radial direction R by the lower cover 20 and the housing 12 .

[0061] In the present embodiment, the O-ring 14 contacts the inner circumferential surface 12A and the upper surface 12B of the housing 12 and the conical outer surface 20C of the lower cover 20, thereby suppressing the relative movement of the lower cover 20 and the housing 12 in the axial direction X and the radial direction R. Therefore, even if vibration is generated due to the rotation of the motor 16, the generation of contact sound from the buckle 22 can be suppressed.

[0062] The other parts are the same as those in the first embodiment, and thus the description thereof will be omitted.

[0063] [Third Embodiment]

[0064] Figure 5 A third embodiment of the drain pump 2 is shown. In this embodiment, the entire circumferential region of the housing portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion, and the O-ring 14 is pressed in the axial direction X and the radial direction R over the entire circumferential region.

[0065] exist Figure 5 In the drain pump 3 according to the present embodiment, as an example of a pressing portion, the lower cover 20 has a conical outer surface 20C of the cylindrical portion 41, and the housing 12 has a conical inner surface 12C. The conical outer surface 20C and the conical inner surface 12C are opposite to each other. The conical inner surface 12C constitutes a part of the recess 42. The O-ring 14 abuts against the conical outer surface 20C and the conical inner surface 12C.

[0066] The reaction force F2 acts on the conical outer surface 20C of the lower cover 20 from the O-ring 14 . The reaction force F2 can be decomposed into a component force F2x in the axial direction X and a component force F2r in the radial direction R. That is, the reaction forces in the axial direction X and the radial direction R act on the lower cover 20 from the O-ring 14 .

[0067] The reaction force F1 acts on the conical inner surface 12C of the housing 12 from the O-ring 14 . The reaction force F1 can be decomposed into a component force F1x in the axial direction X and a component force F1r in the radial direction R. That is, the reaction forces in the axial direction X and the radial direction R act on the housing 12 from the O-ring 14 .

[0068] In this way, the O-ring 14 is pressed and held in the axial direction X and the radial direction R by the lower cover 20 and the housing 12 .

[0069] In the present embodiment, the O-ring 14 suppresses relative movement between the lower cover 20 and the housing 12 in the axial direction X and the radial direction R by making the lower cover 20 abut against the conical outer surface 20C and the conical inner surface 12C of the housing 12. Therefore, even if vibration is generated due to the rotation of the motor 16, the generation of contact sound from the buckle 22 can be suppressed.

[0070] The other parts are the same as those in the first embodiment, and thus the description thereof will be omitted.

[0071] [Fourth Embodiment]

[0072] Figure 6 A fourth embodiment of the drain pump 2 is shown. In this embodiment, the entire circumferential region of the housing portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion, and the O-ring 14 is pressed in the axial direction X and the radial direction R over the entire circumferential region.

[0073] exist Figure 6 In the drain pump 4 according to the present embodiment, as an example of a pressing portion, the lower cover 20 has an outer peripheral surface 20A of a cylindrical portion 41 and a lower surface 20B intersecting the axial direction X. The outer peripheral surface 20A is, for example, along the axial direction X. The outer peripheral surface 20A is, for example, parallel to the axial direction X. The outer peripheral surface 20A and the lower surface 20B are, for example, orthogonal. In addition, as an example of a pressing portion, the housing 12 has an inner peripheral surface 12A of a recessed portion 42 and an upper surface 12B intersecting the axial direction X. The inner peripheral surface 12A is, for example, along the axial direction X. The inner peripheral surface 12A is, for example, parallel to the axial direction X. The inner peripheral surface 12A and the upper surface 12B are, for example, orthogonal.

[0074] The O-ring 14 is formed in a cross-shaped cross section and contacts the outer peripheral surface 20A, the lower surface 20B, the inner peripheral surface 12A, and the upper surface 12B. A reaction force F1r in the radial direction R acts from the O-ring 14 on the inner peripheral surface 12A of the housing 12. A reaction force F1x in the axial direction X acts from the O-ring 14 on the upper surface 12B of the housing 12. That is, the reaction forces in the axial direction X and the radial direction R act from the O-ring 14 on the lower cover 20.

[0075] In addition, a reaction force F2r in the radial direction R acts from the O-ring 14 on the outer peripheral surface 20A of the lower cover 20. A reaction force F2x in the axial direction X acts from the O-ring 14 on the lower surface 20B of the lower cover 20. That is, reaction forces in the axial direction X and the radial direction R act from the O-ring 14 on the lower cover 20. In this way, the O-ring 14 is pressed and clamped by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R, respectively.

[0076] In the present embodiment, the O-ring 14 having a cross-shaped cross section abuts against the outer peripheral surface 20A and the lower surface 20B of the lower cover 20 and the inner peripheral surface 12A and the upper surface 12B of the housing 12, thereby suppressing the relative movement of the lower cover 20 and the housing 12 in the axial direction X and the radial direction R. Therefore, even if vibration is generated due to the rotation of the motor 16, the generation of contact sound from the buckle 22 can be suppressed.

[0077] [Fifth Embodiment]

[0078] Figure 7A fifth embodiment of the drain pump 2 is shown. In this embodiment, the entire circumferential region of the housing portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion, and the O-ring 14 is pressed in the axial direction X and the radial direction R over the entire circumferential region.

[0079] exist Figure 7 In the drainage pump 5 involved in the present embodiment, as an example of a pressing portion, the lower cover 20 has an outer peripheral surface 20A of the cylindrical portion 41 and a lower surface 20B intersecting the axial direction X. The outer peripheral surface 20A is, for example, a surface along the axial direction X. The outer peripheral surface 20A is, for example, parallel to the axial direction X. The outer peripheral surface 20A and the lower surface 20B are, for example, orthogonal. In addition, as an example of a pressing portion, the housing 12 has an inner peripheral surface 12A along the axial direction X and having a smaller dimension in the axial direction X than the outer peripheral surface 20A, and an upper surface 12B intersecting the axial direction X. In the present embodiment, the upper surface 12B is formed as a conical surface that gradually descends in the radial direction R toward the inside. In addition, the upper surface 12B is not limited to a conical surface. In other examples, it may also be a surface orthogonal to the axial direction X.

[0080] The O-ring 14 contacts the outer peripheral surface 20A and the lower surface 20B of the lower cover 20 and the inner peripheral surface 12A and the upper surface 12B of the housing 12 , respectively.

[0081] The reaction force F1r in the radial direction R acts on the inner peripheral surface 12A of the housing 12 from the O-ring 14. The reaction force F1x in the axial direction X acts on the upper surface 12B of the housing 12 from the O-ring 14. That is, the reaction forces in the axial direction X and the radial direction R act on the lower cover 20 from the O-ring 14. In addition, when the upper surface 12B is a conical surface, not only the reaction force F1x in the axial direction X acts on the upper surface 12B, but also the reaction force in the radial direction R acts on the upper surface 12B (not shown).

[0082] In addition, a reaction force F2r in the radial direction R acts from the O-ring 14 on the outer peripheral surface 20A of the lower cover 20. A reaction force F2x in the axial direction X acts from the O-ring 14 on the lower surface 20B of the lower cover 20. That is, reaction forces in the axial direction X and the radial direction R act from the O-ring 14 on the lower cover 20. In this way, the O-ring 14 is pressed and clamped by the lower cover 20 and the housing 12 in the axial direction X and the radial direction R, respectively.

[0083] A space 32 that allows deformation of the O-ring 14 is provided between the lower cover 20 and the housing 12 .

[0084] In the present embodiment, the O-ring 14 is in contact with the outer peripheral surface 20A and the lower surface 20B of the lower cover 20 and the inner peripheral surface 12A and the upper surface 12B of the housing 12, thereby suppressing the relative movement of the lower cover 20 and the housing 12 in the axial direction X and the radial direction R. Therefore, even if vibration is generated due to the rotation of the motor 16, the generation of contact sound from the part of the buckle 22 can be suppressed. In addition, by providing a space 32 between the lower cover 20 and the housing 12, deformation of the O-ring 14 caused by expansion can be allowed. In addition, the expansion of the O-ring 14 refers to expansion and swelling caused by heat. Depending on the material of the O-ring 14, there are also cases where expansion or swelling due to heat.

[0085] The other parts are the same as those in the first embodiment, and thus the description thereof will be omitted.

[0086] [Sixth Embodiment]

[0087] Figure 8 The sixth embodiment of the drain pump 2 is shown. In the first to fifth embodiments described above, the housing 12 and the lower cover 20 have a concave structure, the lower cover 20 is formed with a cylindrical portion 41, and the housing 12 is formed with a concave portion 42 for arranging the cylindrical portion 41. However, the concave structure is not limited to a structure in which the cylindrical portion 41 is formed in the lower cover 20 and the concave portion 42 is formed in the housing 12. In other examples, the cylindrical portion 41 of the concave structure may be formed in the housing 12, and a shape (concave portion 42) for arranging the cylindrical portion 41 may be formed in the lower cover 20. This example is described in the present embodiment.

[0088] exist Figure 8 In the drain pump 6 according to the present embodiment, the cylindrical portion 41 is formed on the upper surface 12B of the housing 12, and the recessed portion 42 is formed on the lower surface 20B of the lower cover 20. In the present embodiment, the entire circumferential region of the accommodating portion 40 along the rotation direction of the rotary blade 51 is configured as a pressing portion, and the O-ring 14 is pressed in the axial direction X and the radial direction R in the entire circumferential region.

[0089] As an example of a pressing portion, the portion of the housing 12 constituting the housing 40 has an outer peripheral surface 12D of the cylindrical portion 41 and an upper surface 12B intersecting the axial direction X. The outer peripheral surface 12D is, for example, along the axial direction X. The outer peripheral surface 12D is, for example, parallel to the axial direction X. The outer peripheral surface 12D and the upper surface 12B are, for example, orthogonal. In addition, as an example of a pressing portion, the portion of the lower cover 20 constituting the housing 40 has a conical inner surface 20D opposite to the outer peripheral surface 12D and the upper surface 12B of the housing 12. The conical inner surface 20D is the inner peripheral surface of the recess 42.

[0090] The O-ring 14 contacts the outer peripheral surface 12D, the upper surface 12B, and the conical inner surface 20D of the lower cover 20 of the housing 12. The reaction force F2 acts on the conical inner surface 20D of the lower cover 20 from the O-ring 14. The reaction force F2 can be decomposed into a component force F2x in the axial direction X and a component force F2r in the radial direction R. That is, the reaction forces in the axial direction X and the radial direction R act on the lower cover 20 from the O-ring 14.

[0091] In addition, a reaction force F1r in the radial direction R acts on the outer peripheral surface 12D of the housing 12 from the O-ring 14. A reaction force F1x in the axial direction X acts on the upper surface 12B of the housing 12 from the O-ring 14. That is, reaction forces in the axial direction X and the radial direction R act on the housing 12 from the O-ring 14.

[0092] In this way, the O-ring 14 is pressed and held in the axial direction X and the radial direction R by the housing 12 and the lower cover 20 .

[0093] In this embodiment, as in the first embodiment, relative movement between the housing 12 and the lower cover 20 in the axial direction X and the radial direction R is suppressed. Therefore, even if vibration is generated due to the rotation of the motor 16 , contact sound from the buckle 22 can be suppressed.

[0094] The other parts are the same as those in the first embodiment, and thus the description thereof will be omitted.

[0095] [Other embodiments]

[0096] An example of the embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above content, and it is needless to say that the present invention can be implemented with various modifications other than the above within the scope not departing from the gist of the present invention.

[0097] In the above-mentioned example, the entire circumferential area of ​​the receiving portion 40 is configured as a pressing portion for pressing the O-ring 14 along the axial direction and radial direction of the rotating blade 51. That is, the receiving portion 40 has a pressing portion for pressing the O-ring 14 along the axial direction and radial direction of the rotating blade 51 in the entire circumferential area. However, the receiving portion 40 is not limited to a structure having a pressing portion in the entire circumferential area along the rotation direction of the rotating blade 51. In other examples, the receiving portion 40 may be in more than two locations (a plurality of locations) in the circumferential direction along the rotation direction of the rotating blade 51, such as Figure 3 , 4, 5, 6, and 7, a pressing portion for pressing the O-ring 14 in the axial direction and radial direction of the rotating blade 51 is provided. In order to stably configure the lower cover 20 relative to the housing 12, the pressing portions provided at multiple locations are preferably separated and configured in the circumferential direction. The pressing portions provided at multiple locations are configured, for example, at equal intervals (equal angular intervals) in the circumferential direction. Furthermore, the O-ring 14 is clamped in the radial direction R by pressing the O-ring in the radial direction R of the rotating blade 51 between two circumferentially adjacent pressing portions of the accommodating portion 40.

[0098] Thus, even if the housing portion 40 has a structure in which the pressing portions are provided at a plurality of locations in the circumferential direction along the rotation direction of the rotary blade 51 , since the O-ring 14 is clamped in the radial direction R over the entire circumferential region, water is stopped between the housing 12 and the lower cover 20 by the O-ring 14 .

[0099] In the case of a structure in which the pressing parts are provided at multiple locations, the positions of the multiple pressing parts and the sizes (circumferential lengths) of the multiple pressing parts are set to positions and sizes that can stabilize the lower cover 20 relative to the housing 12. The sizes (circumferential lengths) of the multiple pressing parts are not limited to being the same. They may also be different lengths.

[0100] When there is only one pressing portion, the pressing portion is not limited to being formed in a ring shape over the entire area of ​​the housing portion 40. The pressing portion may be, for example, C-shaped when viewed from above. When there is only one pressing portion, the position and size (circumferential length) of one pressing portion are set to a configuration and size that can stabilize the lower cover 20 relative to the housing 12.

[0101] The invention of Japanese Patent Application No. 2022-91050 filed on June 3, 2022 is incorporated into this specification by reference in its entirety.

[0102] All documents, patent applications, and technical specifications described in this specification are incorporated herein by reference to the same extent as if each individual document, patent application, or technical specification was specifically and individually indicated to be incorporated by reference.

Claims

1. A drainage pump, comprising: Rotating blades; cover; A housing, which together with the cover forms a pump chamber for accommodating the rotating blades, and the housing is coupled to the cover in the axial direction of the rotating blades by means of a buckle; an annular sealing member; and a housing portion, which is located outside the pump chamber in the radial direction of the rotary blade, is composed of the cover and the housing, and houses the annular sealing member. The housing portion includes a pressing portion that presses the sealing member in the axial direction and the radial direction.

2. The drainage pump according to claim 1, wherein: The pressing portions are provided at a plurality of locations in a circumferential direction along a rotation direction of the rotary blade.

3. The drainage pump according to claim 1, wherein: The pressing portion is provided over the entire circumferential region along the rotation direction of the rotary blade.

4. The drainage pump according to any one of claims 1 to 3, wherein: At least one of a portion of the cover constituting the pressing portion and a portion of the housing constituting the pressing portion has a conical surface.

5. The drainage pump according to claim 4, wherein: The portion of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction. The portion of the housing constituting the pressing portion has a conical inner surface opposite to the outer peripheral surface and the lower surface. The sealing member is in contact with the outer peripheral surface, the lower surface, and the conical inner surface.

6. The drainage pump according to claim 4, wherein: The portion of the housing constituting the pressing portion has an inner peripheral surface along the axial direction and an upper surface intersecting the axial direction. The portion of the cover constituting the pressing portion has a conical outer surface opposite to the inner peripheral surface and the upper surface. The sealing member is in contact with the inner peripheral surface, the upper surface, and the conical outer surface.

7. The drainage pump according to any one of claims 1 to 3, wherein: The portion of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction. The portion of the housing constituting the pressing portion has an inner peripheral surface along the axial direction and an upper surface intersecting the axial direction. The sealing member is formed in a cross-shaped cross section and is in contact with the outer peripheral surface, the lower surface, the inner peripheral surface, and the upper surface.

8. The drainage pump according to any one of claims 1 to 3, wherein: The portion of the cover constituting the pressing portion has an outer peripheral surface along the axial direction and a lower surface intersecting the axial direction. The portion of the housing constituting the pressing portion includes an inner peripheral surface along the axial direction and having an axial dimension smaller than that of the outer peripheral surface, and an upper surface intersecting the axial direction. The sealing member is in contact with the outer peripheral surface, the lower surface, the inner peripheral surface and the upper surface. A space that allows deformation of the sealing member due to expansion is provided between the cover and the housing.

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