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JP-7857204-B2 - Liquid circulation system and liquid modification system

JP7857204B2JP 7857204 B2JP7857204 B2JP 7857204B2JP-7857204-B2

Inventors

  • 大内 努

Assignees

  • 株式会社丸山製作所

Dates

Publication Date
20260512
Application Date
20221007

Claims (8)

  1. A discharge pump (11) that pumps the aqueous liquid (CL) from a tank (4) where the aqueous liquid (CL) is stored, A main flow path (13) is connected to the discharge port of the discharge pump (11) and circulates the aqueous liquid (CL) discharged from the discharge pump (11) to the tank (4), A filter (15) connected to the main flow path (13), A bypass channel (18) branches off from the main channel (13) at a first position downstream of the filter (15) and returns to the main channel (13) at a second position downstream of the first position, A liquid circulation device comprising a microbubble generating pump device (20) connected to the bypass channel (18), which pumps the aqueous liquid (CL) flowing through the bypass channel (18) and incorporates microbubbles into the aqueous liquid (CL) .
  2. The liquid circulation device according to claim 1, wherein the inner diameter of the bypass channel (18) is smaller than the inner diameter of the main channel (13).
  3. The system further includes a flow meter (19) for detecting the flow rate of the main channel (13) at a location downstream of the filter (15) and upstream of the first location, The liquid circulation device according to claim 1, wherein the discharge pump (11) and the microbubble generating pump device (20) stop operating when the flow rate detected by the flow meter (19) is less than or equal to a predetermined value.
  4. The aforementioned microbubble generation pump device (20) A high-pressure pump (22) pumps the aqueous liquid (CL) flowing through the bypass channel (18) at a discharge pressure higher than the discharge pressure of the delivery pump (11), The liquid circulation apparatus according to claim 1, further comprising a microbubble generator (25) connected downstream of the discharge port of the high-pressure pump (22) and for incorporating the microbubbles into the circulating aqueous liquid (CL).
  5. The system further includes a pressure sensor (29) for detecting the discharge pressure of the high-pressure pump (22), The liquid circulation device according to claim 4, wherein the delivery pump (11) and the microbubble generating pump device (20) stop operating when the discharge pressure of the high-pressure pump (22), detected by the pressure sensor (29), is less than or equal to a predetermined value.
  6. The aqueous liquid (CL) is a coolant liquid. The liquid circulation device according to any one of claims 1 to 5, wherein the tank (4) is a coolant tank (4) in which the coolant liquid is stored.
  7. A liquid modification apparatus that dispenses a supplied aqueous liquid (CL) containing fine bubbles, The casing (51) and A main pipe (13B) that penetrates the inside and outside of the housing (51) is provided such that the supply end (13Ba) to which the aqueous liquid (CL) is supplied and the discharge end (13Bb) to which the aqueous liquid (CL) is discharged are located outside the housing (51), A filter (15) is connected to the main piping (13B) and is located inside the housing (51), A bypass pipe (18) is arranged within the housing (51) such that it branches off from the main pipe (13B) at a first position downstream of the filter (15) and returns to the main pipe (13B) at a second position downstream of the first position, A liquid modification apparatus comprising: a microbubble generating pump device (20) connected to the bypass pipe (18) and configured to incorporate microbubbles into the aqueous liquid (CL) flowing through the bypass pipe (18), and located within the housing (51).
  8. The housing (51) has a rectangular parallelepiped shape and includes a first side wall (55) and a first door (57) facing each other, and a second side wall (56) and a second door (58) facing each other. The microbubble generating pump device (20) is provided with a pressure regulating handle (27a) for adjusting the discharge pressure of the aqueous liquid (CL). The filter (15) is positioned in a plan view closer to the first door (57) than to the first side wall (55). The liquid reforming apparatus according to claim 7, wherein the microbubble generating pump device (20) is positioned such that, in a plan view, the pressure regulating handle (27a) is closer to the second door (58) than the second side wall (56), and closer to the first side wall (55) than the first door (57).

Description

Applicable to Article 30, Paragraph 2 of the Patent Law. Publication Date: June 14, 2022. Publication: Nikkan Kogyo Shimbun, Page 8. Article Title: Preventing Cutting Fluid Degradation with Air Bubbles. Applicable under Article 30, Paragraph 2 of the Patent Law. Publication Date: July 21, 2022. Publication: Nikkan Kogyo Shimbun (Daily Industrial News). Advertisement Title: MUFB Coolant Life Extension Device. This disclosure relates to a liquid circulation system and a liquid reforming system. Patent Document 1 discloses an ultrafine bubble generator that incorporates ultrafine bubbles (UFB) into a coolant. Japanese Patent Publication No. 2022-123432 This is a schematic diagram illustrating an example of a liquid circulation system.This is a block diagram showing the control system of an example liquid circulation system.This is a perspective view showing a liquid reforming device used in an example of a liquid circulation system.This is a perspective view showing an example of a liquid reforming apparatus.This is a perspective view showing an example of a liquid reforming apparatus.This is a schematic diagram showing a control panel for an example of a liquid circulation system. The liquid circulation system of this disclosure will be described below with reference to the drawings. In the description of the drawings, the same reference numerals are used for identical or equivalent elements, and redundant descriptions are omitted. For the purposes of the description, the Cartesian coordinate system defined by the X, Y, and Z axes shown in the drawings may be referenced. Figure 1 is a schematic diagram showing an example of a liquid circulation system. Figure 2 is a block diagram showing the control system of the liquid circulation system. Figures 3 to 5 are perspective views showing a liquid modification device used in the liquid circulation system. Figure 6 is a schematic diagram showing the control panel of the liquid circulation system. Figure 3 shows the liquid modification device with the door closed, Figure 4 shows the door open, and Figure 5 omits the door, side wall, top wall, and control panel. The liquid circulation system 1 shown in this example includes a liquid circulation device 10 that circulates the coolant liquid CL, which is an aqueous liquid, stored in a coolant tank 4. The liquid circulation device 10 may also include a coolant liquid circulation unit (not shown) for supplying the coolant liquid CL stored in the coolant tank 4 to a machine tool (not shown), and recovering the coolant liquid CL used by the machine tool and returning it to the coolant tank 4. Note that the aqueous liquid may be a liquid whose main component is water. The liquid circulation device 10 comprises a discharge pump 11, a main flow path 13, and a liquid modification device 50. In one example, the discharge pump 11 is placed inside a tank containing the aqueous liquid to be circulated and pumps the aqueous liquid under pressure. In this example, the discharge pump 11 is located inside the coolant tank 4 where the coolant liquid CL is stored. The discharge pump 11 has a suction port and a discharge port, and discharges the coolant liquid CL supplied from the suction port through the discharge port. The discharge pump 11 may be a submersible pump, such as a so-called centrifugal pump. The main flow path 13 is connected to the discharge port of the delivery pump 11 and circulates the coolant liquid CL discharged from the delivery pump 11 to the coolant tank 4. As shown in Figure 1, one example of the main flow path 13 includes a main pipe 13A connecting the delivery pump 11 and the liquid reforming device 50, a main pipe 13B provided in the liquid reforming device 50, and a main pipe 13C provided between the liquid reforming device 50 and the coolant tank 4. For example, the main flow path 13 may be constructed from a flexible tube. In Figure 1, the direction of flow of the coolant liquid CL through the piping is indicated by arrows. In the following description, the terms "upstream" and "downstream" refer to the direction of flow of the coolant liquid CL. The liquid modification apparatus 50 generates a microbubble-containing liquid by incorporating microbubbles into the aqueous coolant liquid CL. A microbubble-containing liquid is an aqueous liquid containing minute bubbles. In one example, the microbubble-containing liquid is a coolant liquid containing ultrafine bubbles (UFBs), which are bubbles with a diameter of several tens of nanometers to approximately 1 μm. Hereinafter, a coolant liquid containing ultrafine bubbles may be specifically referred to as UFB coolant liquid. An example of a liquid modification apparatus 50 comprises a housing 51, a main pipe 13B, a filter 15, a bypass channel 18, a microbubble generation pump device 20, and a control panel 40. As shown in Figures 3 to 5, the housing 51 has a frame 52 assembled to have a substantially rectangular parallelepiped shape, and an upper wall 53, a first