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JP-7857157-B2 - air purifier

JP7857157B2JP 7857157 B2JP7857157 B2JP 7857157B2JP-7857157-B2

Inventors

  • 村松 陽
  • 野々村 智英
  • 小澄 直也

Assignees

  • 山洋電気株式会社

Dates

Publication Date
20260512
Application Date
20220520

Claims (10)

  1. An air purifier having at least a first flow path and a second flow path that are independent of each other, The first filter and first fan are provided in the first flow path, The second filter and second fan are provided in the second flow path, A differential pressure sensor detects a first pressure difference, which is the pressure difference between the upstream pressure and the downstream pressure in the first filter, and a second pressure difference, which is the pressure difference between the upstream pressure and the downstream pressure in the second filter. A control unit that controls the first and second fans, It has, The control unit controls the rotation speed of at least one of the first and second fans to reduce the difference between the first and second pressure differences when the pressure difference of either the first or second pressure difference exceeds a reference value. Air purifier.
  2. The control unit controls the fan whose pressure difference exceeds the reference value to decrease when either the first or second pressure difference exceeds the reference value, and increases the rotation speed of the fan whose pressure difference does not exceed the reference value. The air purifier according to claim 1.
  3. The control unit varies the timing of controlling the rotation speeds of the first and second fans from the timing of controlling the rotation speeds of the first and second fans to the timing of controlling the rotation speeds of the first and second fans, according to the time change of the pressure difference. The air purifier according to claim 1.
  4. The control unit, while the pressure difference continues to increase, reduces the ratio of the increase in the pressure difference to the reference value each time it controls the rotation speed of the fan to reduce the difference. The air purifier according to claim 3.
  5. The increase in the pressure difference is a value calculated based on the initial value of the pressure difference that is stored in advance. The air purifier according to claim 4.
  6. The control unit provides notification to prompt replacement of the first filter and the second filter when the pressure difference of at least one of the first filter and the second filter exceeds a threshold. The air purifier according to claim 4.
  7. The aforementioned air purifier is equipped with multiple operating modes with different rotation speeds. The threshold is set for each of the operating modes. The air purifier according to claim 6.
  8. The control unit shall notify that the device is malfunctioning if it determines that the first pressure difference or the second pressure difference has decreased below the initial value. The air purifier according to claim 1.
  9. The control unit shall notify the system of a malfunction if it determines that the first pressure difference or the second pressure difference exceeds a threshold when the air purifier starts operating or immediately after the first and second fans are replaced. The air purifier according to claim 1.
  10. If the control unit determines that the current detected value in the first pressure difference or the second pressure difference is smaller than the previous detected value, it sets a reference value for the pressure difference based on the current detected value. The air purifier according to claim 1.

Description

This invention relates to an air purifier. Patent Document 1 discloses a filter replacement estimation device that estimates the replacement timing of installed filters. Japanese Patent Publication No. 2011-191017 This is a perspective view of an air purifier according to an embodiment of the present invention.This is a front cross-sectional view showing the internal structure of an air purifier.This is a flowchart explaining the operation of an air purifier.This is a flowchart explaining the operation of an air purifier.This graph shows the relationship between the filter's aperture ratio and the airflow reduction rate of the air purifier.This graph shows the relationship between the filter's aperture ratio and the rate of increase in pressure loss (pressure difference). The embodiments of the present invention will be described below with reference to the drawings. For the sake of clarity, the descriptions of components having the same reference numeral as those already described in the embodiments will be omitted. Furthermore, the dimensions of the components shown in these drawings may differ from the actual dimensions of the components for the sake of clarity. Figure 1 is a perspective view showing an example of an air purifier according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the air purifier shown in Figure 1 along line A-A. As shown in Figures 1 and 2, the air purifier 1 of this embodiment is a vertical type air purifier and can be used, for example, by being erected on the floor. The air purifier 1 has a box-shaped casing 10 that is long in the vertical direction. A front panel 11 is attached to the front of the casing 10, covering the front. An operating unit 12 for controlling the operating status of the air purifier 1 is provided on the upper part of the front panel 11. A control unit 13 for controlling the operation of the air purifier 1 is provided on the back of the front panel 11. The operating unit 12 is connected to the control unit 13. Air intake ports 14 are provided on both the left and right sides of the housing 10 to draw external air into the housing 10. In the example shown in the figure, a first air intake port 14A is provided on the left side of the housing 10, and a second air intake port 14B is provided on the right side. An air outlet 15 is provided on the top surface of the housing 10 for blowing out the air inside the housing 10, i.e., purified air, to the outside. The air outlet 15 includes a first air outlet 15A that blows out air drawn in from the first intake port 14A, and a second air outlet 15B that blows out air drawn in from the second intake port 14B. The housing 10 has an air passage through which air drawn into the housing 10 passes. In the example shown in the figure, there is a first air passage 20 connecting the first intake port 14A and the first outlet port 15A, and a second air passage 30 connecting the second intake port 14B and the second outlet port 15B. Air drawn into the housing 10 from the first intake port 14A does not pass through the second air passage 30. Similarly, air drawn into the housing 10 from the second intake port 14B does not pass through the first air passage 20. A first filter 21 is provided at the air inlet, i.e., the first intake port 14A, of the first air passage 20. The first filter 21 is a filter for purifying the air drawn into the housing 10 from the first intake port 14A, and is installed within the first air passage 20 so as to face the outside of the housing 10 at the first intake port 14A. A second filter 31 is provided at the air inlet, i.e., the second intake port 14B, in the second air passage 30. The second filter 31 is a filter for purifying the air drawn into the housing 10 from the second intake port 14B, and is installed within the second air passage 30 so as to face the outside of the housing 10 at the second intake port 14B. The first filter 21 and the second filter 31 are dust collection filters for removing dust, dirt, and other particles from the air. For example, HEPA (High Efficiency Particulate Air) filters are used. In the first air passage 20, a first fan 22 is provided downstream of the first filter 21. The first fan 22 is a fan that draws air into the first air passage 20 from outside the housing 10 through the first intake port 14A, and blows the drawn-in air through the first air passage 20 to the first outlet port 15A. The first fan 22 is equipped with a drive motor (not shown) for driving the first fan 22. The drive motor of the first fan 22 is connected to the control unit 13. The first fan 22 is, for example, a sirocco fan. In the second air passage 30, a second fan 32 is provided downstream of the second filter 31. The second fan 32 draws air into the second air passage 30 from outside the housing 10 through the second intake port 14B, and blows the drawn-in air through the second air passage 30 to the second outlet port 15B. The second fan 32 is equipped with