Drain pump
By improving the structure of the drain pump motor housing, the inner wall, outer wall, and motor support are spaced apart, so that only the inner wall transmits vibration and shields noise, thus solving the noise problem caused by motor vibration and achieving more effective noise control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- FUJIKOKI MFG CO LTD
- Filing Date
- 2021-05-19
- Publication Date
- 2026-08-04
AI Technical Summary
The vibration of the existing drainage pump motor causes noise that cannot be effectively reduced, and the noise is transmitted to the inner and outer walls, affecting the noise control effect.
Design a drainage pump motor housing structure, wherein the inner side wall and the outer side wall, the motor support and the motor are arranged separately, the outer side wall is connected to the bottom wall, only the inner side wall transmits vibration and the outer side wall shields noise, and the inner edge of the flat plate of the motor support is connected to the inner side wall to reduce vibration transmission.
It effectively shields motor vibration noise, reducing noise levels, especially significantly reducing noise near 350Hz and 900Hz, achieving more effective noise suppression.
Smart Images
Figure CN115698510B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a drain pump for discharging condensate, for example, from an air conditioner. Background Technology
[0002] Patent Document 1 discloses an example of a conventional drainage pump. The drainage pump of Patent Document 1 has a housing and rotating blades housed within the housing. An electric motor housing is mounted within the housing. The rotating blades are rotated by an electric motor housed within the electric motor housing. The electric motor housing has a lower housing and an upper housing.
[0003] Existing technical documents
[0004] Patent documents
[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-68205
[0006] The technical problem that the invention aims to solve
[0007] Figure 8 , Figure 9 This represents an example of the lower casing of a conventional drainage pump. Figure 8 This is a top view of the lower casing of a conventional drainage pump. Figure 9 It is along Figure 8 A cross-sectional view of the IX-IX line.
[0008] Figure 8 , Figure 9 The lower housing 950 shown includes: a bottom wall portion 951, inner side wall portions 952 and 953, an outer side wall portion 954, and a motor support portion 956. The bottom wall portion 951 has a circular plate shape. The bottom wall portion 951 closes the upper opening of the housing (not shown). The inner side wall portions 952 and 953 have an arcuate shape when viewed from above. The outer side wall portion 954 has a cylindrical shape. The lower ends of the inner side wall portions 952 and 953 and the lower end of the outer side wall portion 954 are connected to the bottom wall portion 951. The motor support portion 956 has an arcuate flat plate portion 956a and a side wall portion 956b connected to the outer edge of the flat plate portion 956a. The inner edge of the flat plate portion 956a is connected to the upper end of the outer side wall portion 954.
[0009] The motor (not shown) contacts the flat plate portion 956a and the side wall portion 956b of the motor support portion 956. Additionally, the motor also contacts the upper ends of the inner side wall portions 952 and 953. Therefore, the motor's vibration is transmitted to the inner side wall portions 952 and 953 and the outer side wall portion 954, failing to adequately reduce noise. Summary of the Invention
[0010] Therefore, the object of the present invention is to provide a drainage pump that can effectively reduce noise.
[0011] Technical means for solving technical problems
[0012] To solve the above-mentioned technical problems, the drainage pump of the present invention comprises: a housing having an inlet and an outlet; a rotating blade housed within the housing; an electric motor disposed above the housing and having a drive shaft connected to the rotating blade; and an electric motor housing mounted on the housing and housing the electric motor, the electric motor housing comprising: a bottom wall portion; a cylindrical inner wall portion having its lower end connected to the bottom wall portion; an outer wall portion, which is either an arc-shaped outer wall portion with its lower end connected to the bottom wall portion, or a cylindrical outer wall portion with its lower end connected to the bottom wall portion; and an electric motor support portion connected to the upper end of the inner wall portion, the outer wall portion being disposed spaced apart from the inner wall portion, the electric motor support portion, and the electric motor.
[0013] In this invention, preferably, the motor support portion has an arc-shaped flat plate portion and a side wall portion connected to the outer edge of the flat plate portion, and only a portion of the inner edge of the flat plate portion is connected to the upper end of the inner side wall portion.
[0014] The effects of the invention
[0015] According to the present invention, the motor housing comprises: a bottom wall portion, a cylindrical inner wall portion with its lower end connected to the bottom wall portion, an outer wall portion with its lower end connected to the bottom wall portion and having an arc-shaped shape when viewed from above, or a cylindrical outer wall portion with its lower end connected to the bottom wall portion, and a motor support portion connected to the upper end of the inner wall portion. Furthermore, the outer wall portion, the inner wall portion, the motor support portion, and the motor are arranged at intervals. Therefore, only the inner wall portion directly transmits the vibration of the motor. Thus, even if the vibration of the motor is transmitted to the inner wall portion and generates noise, the noise can be effectively shielded by the outer wall portion.
[0016] Furthermore, only a portion of the inner edge of the flat plate portion of the motor support is connected to the upper end of the inner wall portion. Therefore, compared to a structure where the entire inner edge of the flat plate portion is connected to the upper end of the inner wall portion, the vibration of the motor transmitted to the inner wall portion can be further reduced. This allows for more effective suppression of noise caused by motor vibration. Attached Figure Description
[0017] Figure 1 This is a front view of a drainage pump according to an embodiment of the present invention.
[0018] Figure 2 yes Figure 1 A cross-sectional view of the drainage pump.
[0019] Figure 3 yes Figure 1A perspective view of the lower casing of a drainage pump.
[0020] Figure 4 yes Figure 1 A top view of the lower casing of the drainage pump.
[0021] Figure 5 It is along Figure 4 A cross-sectional view of the VV line.
[0022] Figure 6 It is along Figure 5 A sectional view along line VI-VI.
[0023] Figure 7 It is a graph showing the relationship between the frequency and noise of a drainage pump during its drainage operation.
[0024] Figure 8 This is a top view of the lower casing of a conventional drainage pump.
[0025] Figure 9 It is along Figure 8 A cross-sectional view of the IX-IX line. Detailed Implementation
[0026] The following is for reference Figures 1-6 A drainage pump according to an embodiment of the present invention will be described.
[0027] Figure 1 This is a front view of a drainage pump according to an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the drainage pump. Figure 2 In the image, only cross-sections are shown of the outer casing and the motor housing. Figure 3 and Figure 4 yes Figure 1 A perspective view and a top view of the lower casing of the drainage pump. Figure 5 It is along Figure 4 A cross-sectional view of the VV line. Figure 6 It is along Figure 5 A sectional view along line VI-VI.
[0028] The drain pump in this embodiment is used to discharge condensate, for example, from the drain pan of the indoor unit of an air conditioner to the outside. The application of this drain pump is not limited to draining condensate. The drain pump can also be used to drain or suck up various liquids from containers.
[0029] like Figure 1 , Figure 2 As shown, the drainage pump 1 of this embodiment includes: a housing 10, a rotating vane 20, a motor 30, and a motor housing 40. The housing 10, the rotating vane 20, and the motor housing 40 are made of synthetic resin.
[0030] The outer casing 10 has a main body 11 with a generally inverted frustum-shaped structure. A suction pipe 12 extending downwards is provided in the main body 11. The suction pipe 12 has a cylindrical shape extending linearly in the vertical direction. The suction pipe 12 has a downward-facing suction port 12a. A discharge pipe 13 extending laterally is provided in the main body 11. The discharge pipe 13 has a laterally-facing discharge port 13a. In this embodiment, the discharge pipe 13 has a cylindrical shape extending linearly in the horizontal direction. Alternatively, the discharge pipe 13 may have a generally L-shaped or arc-shaped discharge port 13a facing upwards. The suction pipe 12 and the discharge pipe 13 are connected to a pump chamber 14 located inside the main body 11.
[0031] The rotating blade 20 has a shaft portion 21, a large-diameter blade portion 22, and a small-diameter blade portion 23. The shaft portion 21 is cylindrical. The large-diameter blade portion 22 has a plurality of flat, large-diameter blades (not shown) extending radially from the shaft portion 21. The large-diameter blade portion 22 has a cylindrical ring 22a connecting the tips of the plurality of large-diameter blades; and an annular lower plate 22b whose outer periphery is connected to the lower end of the ring 22a. The large-diameter blade portion 22 is disposed in the pump chamber 14. The small-diameter blade portion 23 has a plurality of flat, small-diameter blades 23a. The plurality of small-diameter blades 23a extend downward from the lower ends of the plurality of large-diameter blades through the inside of the lower plate 22b. The small-diameter blade portion 23 is disposed inside the suction pipe 12.
[0032] The electric motor 30 is positioned above the housing 10. The electric motor 30 has an electric motor body 31 and a drive shaft 32 extending downward from the electric motor body 31. The drive shaft 32 is connected to the shaft portion 21 of the rotating blade 20.
[0033] The motor housing 40 is mounted to the outer casing 10 via a snap-fit mechanism 41. The motor housing 40 has a lower casing 50 and an upper casing 60.
[0034] The lower housing 50 includes a bottom wall portion 51, an inner side wall portion 52, outer side wall portions 54 and 55, and a motor support portion 56.
[0035] The bottom wall portion 51 has a circular plate shape. The bottom wall portion 51 closes the upper opening of the main body portion 11 of the outer casing 10. The bottom wall portion 51 and the main body portion 11 together divide the pump chamber 14. A shaft hole 51a is provided in the center of the bottom wall portion 51. The shaft portion 21 of the rotating blade 20 is arranged in the shaft hole 51a.
[0036] The inner wall portion 52 has a cylindrical shape. The lower end of the inner wall portion 52 is connected to the bottom wall portion 51. The inner wall portion 52 extends upward from the bottom wall portion 51.
[0037] The outer wall portions 54 and 55 have an arcuate shape when viewed from above. The lower ends of the outer wall portions 54 and 55 are connected to the bottom wall portion 51. The outer wall portions 54 and 55 extend upward from the bottom wall portion 51. The outer wall portions 54 and 55 are disposed outside the inner wall portion 52. The inner wall portion 52 is disposed between the outer wall portions 54 and 55. When viewed from above, the center of the inner wall portion 52 is located at the same position as the center of the arcuate shape of the outer wall portions 54 and 55. The upper ends of the outer wall portions 54 and 55 are lower than the upper ends of the inner wall portion 52. Alternatively, instead of the arcuate outer wall portions 54 and 55 when viewed from above, one or more arcuate outer wall portions disposed outside the inner wall portion 52 may be used. Or, a cylindrical outer wall portion disposed outside the inner wall portion 52 may be used.
[0038] The motor support portion 56 has a flat plate portion 56a and a side wall portion 56b. The flat plate portion 56a has an arcuate shape. The lower end of the side wall portion 56b is connected to the outer edge of the flat plate portion 56a. A portion of the inner edge of the flat plate portion 56a (in...) Figure 4 In the diagram, the inner sidewall portion 56a (represented by the symbol k) is connected to the upper end of the inner sidewall portion 52. The length of the inner edge portion of the plate portion 56a is preferably more than 5% and less than 20% of the total length of the inner edge. The motor 30 contacts the plate portion 56a and the sidewall portion 56b.
[0039] The upper housing 60 is mounted to the side wall 56b of the motor support portion 56 of the lower housing 50 via a snap-fit mechanism 42. The upper housing 60 covers the upper part of the motor 30. The motor housing 40 houses the motor 30 between the motor support portion 56 and the upper housing 60. A portion of the motor 30, such as the wiring portion, is located on the outside of the motor housing 40.
[0040] The outer sidewalls 54 and 55 of the motor housing 40 are arranged at intervals from the inner sidewall 52, the motor support 56, and the motor 30. That is, the outer sidewalls 54 and 55 are only connected to the bottom wall 51 and do not directly contact anything other than the bottom wall 51.
[0041] Based on the above, in the drainage pump 1 of this embodiment, the motor housing 40 includes: a bottom wall portion 51, a cylindrical inner wall portion 52 connected to the bottom wall portion 51 at its lower end, outer wall portions 54 and 55 in a top-view arc shape connected to the bottom wall portion 51 at their lower ends, and a motor support portion 56 connected to the upper end of the inner wall portion 52. Furthermore, the outer wall portions 54 and 55 are arranged at intervals from the inner wall portion 52, the motor support portion 56, and the motor 30. Therefore, only the inner wall portion 52 directly transmits the vibration of the motor 30. Thus, even if the vibration of the motor 30 is transmitted to the inner wall portion 52 and generates noise, the noise can be effectively shielded by the outer wall portions 54 and 55. Therefore, noise caused by the vibration of the motor 30 can be effectively suppressed.
[0042] Furthermore, only a portion of the inner edge of the flat plate portion 56a of the motor support portion 56 is connected to the upper end of the inner wall portion 52. Therefore, compared to a structure where the entire inner edge of the flat plate portion 56a is connected to the upper end of the inner wall portion 52, the vibration of the motor 30 transmitted to the inner wall portion 52 can be further reduced. As a result, noise caused by the vibration of the motor 30 can be suppressed more effectively. In particular, by making the length of a portion of the inner edge of the flat plate portion 56a more than 5% and less than 20% of the total length of the inner edge, a more balanced approach can be taken to achieve both the rigidity of the motor support portion 56 and noise suppression.
[0043] The embodiments of the present invention have been described above, but the present invention is not limited to the structure of the embodiments. Embodiments obtained by adding, deleting, or modifying the constituent elements of the above embodiments, or by appropriately combining the features of the embodiments, as long as they possess the spirit of the present invention, are included within the scope of the present invention.
[0044] The inventors of this application used Embodiment 1 and Comparative Example 1 of the drainage pump of the present invention to measure the noise during drainage operation, thereby verifying the effectiveness of the present invention.
[0045] Example 1 has the structure of the drainage pump 1 described above.
[0046] Comparative Example 1 has adopted Figure 8 , Figure 9 The lower housing 950 of a conventional drain pump is shown. Comparative Example 1 has the same structure as Example 1 except for the lower housing 950.
[0047] The inventors of this application placed a microphone 1m above Example 1 and Comparative Example 1, used Example 1 and Comparative Example 1 to drain condensate from the drain pan, and measured the noise during the drainage operation of Example 1 and Comparative Example 1. Figure 7 The measurement results are shown. Figure 7 It is a graph showing the relationship between the frequency and noise of a drainage pump during its drainage operation.
[0048] Depend on Figure 7 It can be seen that in Example 1 and Comparative Example 1, waveforms showing increased noise around 350Hz and 900Hz were observed. While the noise level in Comparative Example 1 exceeded 20dB, the noise level in Example 1 was suppressed to below 20dB.
[0049] Therefore, it can be seen that the effect of the present invention is significant even in verification using real machines.
[0050] Symbol Explanation
[0051] 1…Drainage pump, 11…Main body, 12…Suction pipe, 12a…Suction inlet, 13…Discharge pipe, 13a…Discharge outlet, 14…Pump chamber, 10…Outer casing, 20…Rotating blades, 21…Shaft, 22…Large diameter blade section, 22a…Ring, 22b…Lower plate, 23…Small diameter blade section, 23a…Small diameter blade, 30…Motor, 31…Motor body, 32…Drive shaft, 40…Motor housing, 41, 42…Snap-fit mechanism, 50…Lower housing, 51…Bottom wall, 51a…Shaft hole, 52…Inner side wall, 54, 55…Outer side wall, 56…Motor support, 56a…Plate plate, 56b…Side wall, 60…Upper housing
Claims
1. A drainage pump, characterized in that, It comprises: a housing having an inlet and an outlet; a rotating blade housed within the housing; a motor disposed above the housing and having a drive shaft connected to the shaft portion of the rotating blade; and a motor housing mounted on the housing and housing the motor. The motor housing has: A plate-shaped bottom wall portion that closes the upper opening of the housing and, together with the housing, divides the pump chamber for the arrangement of the rotating blades; A cylindrical inner wall portion, the lower end of which is connected to the bottom wall portion; The outer wall portion, which is either an arc-shaped outer wall portion connected at its lower end to the bottom wall portion in plan view, or a cylindrical outer wall portion connected at its lower end to the bottom wall portion; and The motor support portion is connected to the upper end of the inner sidewall portion. The outer sidewall portion is disposed radially outward of the inner sidewall portion. The upper end of the outer side wall portion is positioned below the upper end of the inner side wall portion. The bottom wall portion has a hole that connects the internal space of the pump chamber and the inner side wall portion and allows the shaft portion of the rotating blade to be inserted. Within the internal space of the inner wall portion, the drive shaft of the electric motor is connected to the shaft portion of the rotating blade. The outer side wall portion is arranged at intervals from the inner side wall portion, the motor support portion, and the motor.
2. The drainage pump according to claim 1, characterized in that, The motor support portion has an arc-shaped flat plate portion and a side wall portion connected to the outer edge of the flat plate portion. Only a portion of the inner edge of the flat plate is connected to the upper end of the inner sidewall.
3. The drainage pump according to claim 1, characterized in that, The motor housing has multiple outer wall portions that are arc-shaped when viewed from above.
4. The drainage pump according to claim 2, characterized in that, The length of the portion of the inner edge of the plate portion that connects to the upper end of the inner sidewall portion is more than 5% and less than 20% of the total length of the inner edge of the plate portion.