Filtration device for separating foreign bodies from a fluid

Abstract

The present application provides a cyclone separator type foreign matter separation device capable of effectively suppressing foaming caused by bubbles of a treatment liquid, and having high defoaming effect. The cyclone separator type foreign matter separation device (1) includes: a cyclone separator main body (2) including a cylindrical portion (2A) and a tapered cylindrical portion (2B) extending downward from a lower end of the cylindrical portion (2A) and gradually reducing in diameter; a treatment liquid introduction pipe (3) including an introduction port (3a) opened in the cylindrical portion (2A) in a tangential direction; an upper housing (4) provided at an upper portion of the cyclone separator main body (2); a treatment liquid discharge pipe (5) opened in the upper housing (4); a communication pipe (6) coaxially arranged with a shaft center (O) of the cyclone separator main body (2) and communicating an inside of the cyclone separator main body (2) with an inside of the upper housing (4); and a porous defoaming pipe (7) vertically arranged in the upper housing (4) in a coaxial manner with the shaft center (O) of the cyclone separator main body (2), and having a lower end portion inserted into the communication pipe (6), wherein a vortex retention mechanism (slit (14)) for retaining a vortex generated in the defoaming pipe (7) is provided in the defoaming pipe (7).

Description

Technical Field

[0001] This invention relates to a cyclone separator-type foreign matter separation device for separating foreign matter such as metal powder from processing liquids such as coolants using centrifugal force. Background Technology

[0002] For example, when machining metal materials using a machine tool, a water-soluble coolant is supplied to the cutting part for cooling or lubrication, and for effective removal of cutting chips. Therefore, the coolant may contain foreign matter such as metal fragments or abrasive particles from the cutting chips.

[0003] Because the coolant is used repeatedly, foreign matter mixed in with it must be removed before reuse. One known mechanism for removing this foreign matter is a cyclone separator-type foreign matter separation device. This cyclone separator-type foreign matter separation device comprises: a cyclone separator body with a foreign matter outlet at its lower end; a processing liquid inlet pipe having an inlet opening tangentially into the interior of the cyclone separator body; an upper housing disposed at the upper part of the cyclone separator body; a processing liquid outlet pipe opening into the upper housing; and a connecting pipe connecting the interior of the cyclone separator body to the interior of the upper housing.

[0004] In the aforementioned cyclone separator-type foreign matter separation device, the cyclone separator body comprises a cylindrical portion and a conical portion extending downward from the lower end of the cylindrical portion and gradually narrowing in diameter. When coolant containing foreign matter is sprayed from the inlet of the processing liquid inlet pipe toward the cylindrical portion of the cyclone separator body, the coolant becomes a swirling flow and descends along the inner surface of the cyclone separator body. This generates a vortex inside the cyclone separator body, causing foreign matter with a higher specific gravity than the coolant to be sprayed onto the inner surface of the cyclone separator body by centrifugal force and separated from the coolant. The separated foreign matter descends along the inner surface of the cyclone separator body and is discharged from the foreign matter outlet and recovered.

[0005] Furthermore, the descending vortex along the inner surface of the cyclone separator body turns upward near the foreign matter discharge port, generating a vortex at the axial center of the cyclone separator body that flows from the foreign matter discharge port toward the upper housing. This rising vortex includes a columnar air layer that reaches the upper housing from the foreign matter discharge port through a connecting pipe and a purified coolant layer that rises along the circumference of the air layer. The coolant constituting the purified coolant layer is guided into the upper housing along with the rising vortex and discharged from the upper housing into the treatment liquid discharge pipe for reuse.

[0006] However, in the cyclone separator-type foreign matter separation device described above, the outlet of the connecting pipe opens directly into the interior of the upper casing, causing the air layer and the coolant layer to mix at the outlet of the connecting pipe. Therefore, the following problem exists: air enters the coolant, causing the coolant to foam violently inside the upper casing, resulting in a large number of bubbles.

[0007] Therefore, Patent Document 1 proposes as follows Figure 11 The cyclone separator type foreign matter separation device shown is shown.

[0008] Right now, Figure 11 This is a longitudinal sectional view of the cyclone separator-type foreign matter separation device proposed in Patent Document 1. In the illustrated cyclone separator-type foreign matter separation device 101, in the cleaning chamber S inside the cleaning housing (upper housing) 104, the gas-liquid separation pipe (defoaming pipe) into which the vortex flows is coaxially arranged with the axis center O of the cyclone separator body 102. Furthermore, at the bottom inside the upper housing 104, a first storage section 121 is provided to temporarily store the coolant that has passed through the gas-liquid separation pipe 107, surrounding the gas-liquid separation pipe 107, and a second storage section 122 is provided to temporarily store the coolant flowing in from the first storage section 121.

[0009] According to the cyclone separator-type foreign matter separation device 101 configured as described above, the coolant purified by separating foreign matter within the cyclone separator body 102 flows from the connecting pipe 106 into the gas-liquid separation pipe 107. However, since the coolant rises around the columnar air layer, only this coolant flows into the first storage section 121 through the small hole 107a of the gas-liquid separation pipe 107. Therefore, the coolant flowing into the gas-liquid separation pipe 107 can be extracted separately, preventing air from being entrained in the coolant and thus preventing the coolant from foaming.

[0010] Previous technical documents

[0011] Patent documents

[0012] Patent Document 1: Japanese Patent Application Publication No. 2005-007212 Summary of the Invention

[0013] The technical problem to be solved by the invention

[0014] However, as proposed in Patent Document 1 Figure 11 In the cyclone separator-type foreign matter separation device 101 shown, the intensity of the vortex decreases or the vortex disappears in the gas-liquid separation tube 107. Therefore, the following problems exist: the separation effect of the coolant and air in the gas-liquid separation tube 107 becomes lower, and the defoaming effect that can effectively suppress foaming caused by coolant bubbles becomes lower.

[0015] The present invention was developed in view of the above-mentioned problems, and its purpose is to provide a cyclone separator-type foreign matter separation device with high defoaming effect that effectively suppresses foaming caused by bubbles in the treatment liquid.

[0016] means for solving technical problems

[0017] To achieve the above objectives, the present invention provides a cyclone separator type foreign matter separation device, comprising: a cyclone separator body; an upper shell disposed on the upper part of the cyclone separator body; a connecting pipe connecting the interior of the cyclone separator body and the interior of the upper shell; and a defoaming pipe inserted into the connecting pipe. The cyclone separator type foreign matter separation device is characterized in that the defoaming pipe is provided with a vortex holding mechanism for retaining the vortex generated within the defoaming pipe. Here, the vortex holding mechanism is, for example, constituted by a slit for guiding the vortex swirling along the outer periphery of the defoaming pipe into the interior of the defoaming pipe.

[0018] Invention Effects

[0019] According to the present invention, the intensity of the vortex generated within the defoaming tube is maintained by the vortex-holding mechanism. Therefore, the treatment liquid swirling within the defoaming tube flows outwards through the small holes of the defoaming tube, while the air layer (bubbles) remains inside the defoaming tube. Thus, the treatment liquid and air do not mix, achieving a high defoaming effect based on the defoaming tube, thereby effectively preventing foaming of the treatment liquid. Here, when the vortex-holding mechanism is constituted by a slit, the vortex swirling along the outer periphery of the defoaming tube is introduced into the defoaming tube through the slit. This introduced vortex maintains the intensity of the vortex within the defoaming tube, thus achieving a high defoaming effect based on the defoaming tube. Attached Figure Description

[0020] Figure 1 This is a longitudinal sectional view of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention.

[0021] Figure 2 This is a longitudinal sectional view of the main parts of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention.

[0022] Figure 3 This is a top view of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention (from...). Figure 2 (See the diagram viewed from the direction of arrow A).

[0023] Figure 4 It is along Figure 2 An enlarged sectional view cut along the BB line.

[0024] Figure 5 It is along Figure 2 An enlarged sectional view cut by the CC line.

[0025] Figure 6 This is the front view of the defoaming tube.

[0026] Figure 7 It is along Figure 6 An enlarged sectional view cut along the DD line.

[0027] Figure 8 This is a 3D view of the upper part of the defoaming tube.

[0028] Figure 9 This is a longitudinal sectional view of the main parts of the cyclone separator-type foreign matter separation device according to the second embodiment of the present invention.

[0029] Figure 10 It is along Figure 9 Enlarged sectional view of the EE line section.

[0030] Figure 11 This is a longitudinal sectional view of the cyclone separator-type foreign matter separation device proposed in Patent Document 1. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0032] <First Implementation>

[0033] Figure 1 This is a longitudinal sectional view of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention. Figure 2 This is a longitudinal sectional view of the main parts of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention. Figure 3 This is a top view of the cyclone separator-type foreign matter separation device according to the first embodiment of the present invention (from...). Figure 2 (The diagram viewed in the direction of arrow A) Figure 4 It is along Figure 2 Enlarged sectional view of the section cut by the BB line. Figure 5 It is along Figure 2 Enlarged sectional view cut by the CC line. Figure 6 This is the front view of the defoaming tube. Figure 7 It is along Figure 6 Enlarged sectional view of the DD line section. Figure 8 This is a 3D view of the upper part of the defoaming tube.

[0034] The cyclone separator-type foreign matter separation device 1 described in this embodiment separates and removes metal foreign matter such as cutting chips from the water-soluble coolant supplied to the machining section of a machine tool that cuts metal materials using centrifugal force. Its configuration is as follows.

[0035] That is, such as Figure 1As shown, the cyclone separator type foreign matter separation device 1 is configured to include: a cyclone separator body 2; a treatment liquid inlet pipe 3 connected to the outer periphery of the cyclone separator body 2; an upper housing 4 disposed on the upper part of the cyclone separator body 2; a treatment liquid outlet pipe 5 connected to the upper housing 4; a cylindrical connecting pipe 6 coaxially arranged with the axial center O of the cyclone separator body 2 and connecting the interior of the cyclone separator body 2 with the interior of the upper housing 4; and a defoaming pipe 7 vertically arranged in the upper housing 4 in a manner coaxial with the axial center O of the cyclone separator body 2.

[0036] The aforementioned cyclone separator body 2 is composed of a cylindrical portion 2A and a conical portion 2B that extends downward from the lower end of the cylindrical portion 2A and gradually narrows in diameter. The cylindrical portion 2A and the conical portion 2B are arranged coaxially and perpendicularly. Furthermore, a circular foreign matter discharge port 8 is provided at the lower end of the conical portion 2B for discharging foreign matter separated from the coolant to the outside.

[0037] And, as Figure 3 As shown, on the upper part of the cylindrical portion 2A of the cyclone separator body 2, there is a circular inlet 3a that opens in the direction of the tangent T at point p on the outer periphery of the cylindrical portion 2A (tangential direction). Figure 1 and Figure 2 The processing liquid inlet pipe 3 is installed at an offset relative to the axial center O of the cyclone separator body 2. Figure 3 At the position of ε shown.

[0038] And, as Figure 2 As shown, a cylindrical container-shaped upper housing 4 is provided on the upper part of the cyclone separator body 2, separated by a partition wall 9. This upper housing 4 is configured as a cylindrical container by covering the top and bottom of the cylindrical side wall 4A with a circular plate-shaped cover 4B and the partition wall 9, respectively. Its interior forms a space for temporarily storing the clean coolant after the separation and removal of foreign matter. Furthermore, a processing liquid discharge pipe 5 with an outlet 5a opening towards the axial center O of the upper housing 4 is installed on the side wall 4A of the upper housing 4. Additionally, as... Figure 2 As shown, in the upper shell 4, the cover 4B is connected by multiple (eight in the illustrated example) supports (see reference). Figure 3 Bolt 11 is installed on the annular flange 10 fixed to the upper inner circumference of the side wall 4A, thereby covering the upper part of the housing 4 with the cover 4B.

[0039] like Figure 1 and Figure 2 As shown, the connecting pipe 6 is vertically arranged in the upper part of the cyclone separator body 2, and its upper end is inserted from below into the circular hole 9a formed in the center of the partition wall 9 (see reference). Figure 2 It is fixed to the partition wall 9 by welding or other means. Additionally, such as... Figure 2As shown, the lower end inner circumferential surface of the connecting pipe 6 forms a conical guide surface 6a that expands downwards. Because the connecting pipe 6 has the guide surface 6a, the eddy current m can be easily introduced into the connecting pipe 6.

[0040] like Figure 6 and Figure 8 As shown, the defoaming tube 7 is formed by bending a perforated metal plate with multiple round holes 7a into a cylindrical shape, as shown in the figure. Figure 2 As shown, its upper end abuts against the center of the lower surface of the cover 4B of the upper housing 4 and is fixed to the cover 4B by bolts 12. Specifically, a threaded seat 13 is fitted into the upper end of the defoaming tube 7, and the upper end of the defoaming tube 7 is fixed to the cover 4B by screwing the bolt 12, which passes through the center of the cover 4B from above, into the threaded seat 13. Furthermore, as... Figure 1 and Figure 2 As shown, the lower end of the defoaming tube 7 is inserted into the interior of the connecting tube 6 from above, and a cylindrical gap δ is formed between the inner circumference of the lower end of the connecting tube 6 and the outer circumference of the defoaming tube 7.

[0041] The multiple round holes 7a formed in the defoaming tube 7 allow only the coolant after foreign matter has been removed to pass through, while preventing air bubbles contained in the coolant from passing through. Their inner diameter is set to 0.5 mm to 2.5 mm, preferably 1.0 mm. Alternatively, the defoaming tube 7 can be replaced by a metal mesh or the like instead of a perforated metal plate.

[0042] like Figures 6-8 As shown, a portion of the outer periphery of the defoaming tube 7 is formed along the vertical direction with a vortex m (described later) that is used to retain the vortex m generated within the defoaming tube 7. Figure 1 and Figure 2 The slit 14 of the vortex retaining mechanism. As described later, the slit 14 is used to guide the vortex of air-containing coolant circulating along the outer periphery of the defoaming tube 7 into the interior of the defoaming tube 7, and as... Figure 7 As shown, an opening is made on a vertical plane passing through the axial center O of the defoaming tube 7.

[0043] More specifically, such as Figure 7 As shown, the defoaming tube 7 is composed of two semi-cylindrical tubes 7A and 7B, which are eccentric to each other and have different diameters. A slit 14 is formed between the free edges of the two semi-cylindrical tubes 7A and 7B in the vertical direction. Here, the two cylindrical tubes 7A and 7B with different diameters constituting the defoaming tube 7 are formed as a single unit in this embodiment, but they can also be formed separately and then joined together. Furthermore, the slit 14 is preferably formed along the entire length of the defoaming tube 7 in the vertical direction, but in this embodiment, in order to maintain the shape of the defoaming tube 7, such as... Figure 6 and Figure 8As shown, the end edges of the two cylindrical tubes 7A and 7B are connected to each other by multiple (four in the example) brackets 7b arranged at appropriate intervals in the vertical direction.

[0044] And, as Figure 6 and Figure 8 As shown, two round scale discharge holes 7c are formed at the upper end of the defoaming tube 7, with an inner diameter larger than that of the small hole 7a. The relatively large scale contained in the coolant (scale that cannot pass through the small hole 7a) is discharged out of the defoaming tube 7 through the scale discharge holes 7c.

[0045] Next, the function of the cyclone separator-type foreign matter separation device 1 constructed as described above will be explained.

[0046] In the cyclone separator-type foreign matter separation device 1 according to this embodiment, coolant containing foreign matter is sprayed tangentially at a predetermined speed from the inlet 3a of the processing liquid inlet pipe 3 toward the cylindrical portion 2A of the cyclone separator body 2. In this way, as... Figure 1 As shown, the coolant containing foreign matter swirls and descends along the inner surfaces of the cylindrical portion 2A and the conical portion 2B of the cyclone separator body 2 under centrifugal force. As a result, a vortex M centered on the axis O is generated inside the cyclone separator body 2, and the foreign matter contained in the coolant is separated by centrifugal force based on this vortex M. That is, since a centrifugal force greater than that acting on the coolant acts on the foreign matter, which has a greater specific gravity than the coolant, the foreign matter is separated from the coolant by this difference in centrifugal force and sprayed onto the inner surface of the cyclone separator body 2. While swirling, the foreign matter descends along the inner surface of the cyclone separator body 2 by its own weight and is discharged from the foreign matter discharge port 8, which opens at the lower end of the conical portion 2B, to the outside of the cyclone separator body 2 and is recovered.

[0047] On the other hand, the vortex M of coolant, which is descending while swirling along the inner surface of the cyclone separator body 2, is subjected to an upward force near the foreign matter discharge port 8 and turns upward. Therefore, as Figure 1 As shown, inside the cyclone separator body 2, a vortex m is generated at the shaft center O, flowing from the foreign matter outlet 8 toward the upper housing 4.

[0048] Here, the vortex m includes a cylindrical air layer with a central vacuum cavity and a cylindrical coolant layer surrounding the air layer. These air and coolant layers pass from the foreign matter outlet 8 through the connecting pipe 6 to the defoaming pipe 7. The coolant layer forms the surface portion of the vortex m and rises along the periphery of the air layer from the foreign matter outlet 8 towards the defoaming pipe 7. Furthermore, as described above, the inner circumferential surface of the lower end of the connecting pipe 6 forms a guide surface 6a, thus smoothly guiding the upward-facing vortex m to the connecting pipe 6 and into the defoaming pipe 7 from its lower opening.

[0049] Furthermore, if the rising vortex m flows into the defoaming tube 7, the clean coolant occupying its surface portion flows into the interior of the upper housing 4 through the multiple small holes 7a of the defoaming tube 7 and is temporarily stored at the bottom of the upper housing 4. Thus, in the defoaming tube 7, the air contained in the vortex m is separated from the coolant, and only the coolant is discharged to the outside of the defoaming tube 7. Therefore, coolant can be extracted separately from the interior of the upper housing 4 before the air and coolant mix. Therefore, the coolant inside the upper housing 4 will not foam due to air bubbles. That is, the defoaming tube 7 achieves a high defoaming effect, thereby effectively preventing coolant foaming. Furthermore, the clean coolant, free of air bubbles, temporarily stored inside the upper housing 4 flows from the outlet 5a opening into the side wall 4A of the upper housing 4 into the processing liquid discharge pipe 5, and is discharged from the processing liquid discharge pipe 5 to the outside of the upper housing 4 for reuse.

[0050] Not all eddies m are guided into the defoaming tube 7 and repeatedly swirled; some rise while swirling along the outer periphery of the defoaming tube 7. Therefore, as... Figure 4 As shown, in the cylindrical gap δ formed between the connecting pipe 6 and the defoaming pipe 7, the direction of the arrow in the figure is as follows ( Figure 4 The vortex (rotating counterclockwise) is like Figure 4 As indicated by the middle arrow a, the coolant flows into the defoaming tube 7 through a slit 14 formed on a portion of the outer periphery of the defoaming tube 7, which strengthens or maintains the swirling of the vortex m within the defoaming tube 7. Therefore, the swirling intensity of the vortex m within the defoaming tube 7 does not decrease, thereby improving the defoaming effect based on the defoaming tube 7 and reliably preventing foaming of the coolant temporarily stored inside the upper housing 4.

[0051] And, as Figure 5 As shown, inside the upper housing 4, there is also a defoaming tube 7 extending outwards towards the direction of the arrow (…). Figure 5 A vortex that rotates counterclockwise, but as Figure 5As indicated by arrow b, the vortex flows into the defoaming tube 7 through a slit 14 formed on a portion of the outer periphery of the defoaming tube 7, which strengthens or maintains the swirling of the vortex m within the defoaming tube 7. Therefore, the swirling intensity of the vortex m within the defoaming tube 7 is maintained without attenuation, thereby improving the defoaming effect based on the defoaming tube 7. Furthermore, although the coolant flowing out of the defoaming tube 7 still contains some air bubbles, a better defoaming effect can be obtained by allowing the coolant to re-enter the defoaming tube 7 through the slit 14 and then allowing the re-entered coolant to flow out of the defoaming tube 7 again. Therefore, by forming the slit 14 along the entire length of the defoaming tube 7 in the vertical direction, the defoaming effect can be further improved.

[0052] As described above, in the cyclone separator-type foreign matter separation device 1 according to this embodiment, the intensity of the vortex m generated in the defoaming tube 7 is maintained by the vortex flowing into the defoaming tube 7 from the slit 14 constituting the vortex holding mechanism. Therefore, air and coolant are effectively separated in the defoaming tube 7, and only coolant is extracted from the defoaming tube 7. As a result, air is not mixed into the extracted coolant to generate bubbles, thus improving the defoaming effect based on the defoaming tube 7.

[0053] <Second Implementation>

[0054] Next, refer to Figure 9 and Figure 10 The second embodiment of the present invention will now be described.

[0055] Figure 9 This is a longitudinal sectional view of the main parts of the cyclone separator-type foreign matter separation device according to the second embodiment of the present invention. Figure 10 It is along Figure 9 Enlarged sectional views of the EE line section, in these figures, for... Figures 1 to 8 Requirements that are identical as shown are marked with the same symbols, and repeated descriptions of them are omitted below.

[0056] The cyclone separator type foreign matter separation device 1A involved in this embodiment is characterized in that the circular tube 15 is vertically arranged in the vertical direction at the center of the axis of the defoaming tube 7, and the other structures are the same as those of the cyclone separator type foreign matter separation device 1 in the first embodiment.

[0057] In the cyclone separator-type foreign matter separation device 1A according to this embodiment, the swirling intensity of the vortex m that rotates and rises within the defoaming tube 7 is maintained or enhanced by the vortex flowing into the defoaming tube 7 from the slit 14, and the coolant contained in the vortex m is also separated from the air and extracted from the defoaming tube 7. However, in this embodiment, as... Figure 10As shown, the volume inside the defoaming tube 7 is reduced by an amount equivalent to that of the circular tube 15, thus increasing the swirling intensity of the vortex m inside the defoaming tube 7. As a result, the defoaming effect based on the defoaming tube 7 can also be improved.

[0058] In addition, in this embodiment, the round tube 15 is arranged vertically in the vertical direction at the center of the axis of the defoaming tube 7. However, a solid round rod (not shown) can be arranged vertically in the vertical direction at the center of the axis of the defoaming tube 7 instead of the round tube 15, which can also achieve the same effect as described above.

[0059] Furthermore, the above description explains how the present invention is applied to a cyclone separator-type foreign matter separation device for separating foreign matter such as metal cutting chips contained in a coolant. However, the present invention can also be applied to a cyclone separator-type foreign matter separation device for separating and removing foreign matter other than cutting chips contained in any processing fluid other than a coolant.

[0060] Furthermore, the present invention is not limited to the application of the above-described embodiments. It is self-evident that various modifications can be made within the scope of the claims and the technical concept described in the specification and drawings.

[0061] Symbol Explanation

[0062] 1. 1A - Cyclone separator type foreign matter separation device; 2 - Cyclone separator body; 2A - Cylindrical part of cyclone separator body; 2B - Conical part of cyclone separator body; 3 - Processing liquid inlet pipe; 3a - Inlet of processing liquid inlet pipe; 4 - Upper shell; 5 - Processing liquid outlet pipe; 6 - Connecting pipe; 7 - Defoaming pipe; 7A, 7B - Semi-cylindrical pipe; 7a - Small hole of defoaming pipe; 8 - Foreign matter outlet; 14 - Slit (vortex holding mechanism); 15 - Circular pipe; M, m - Vortex; O - Axis center of cyclone separator body.

Claims

1. A cyclone separator-type foreign matter separation device, comprising: Cyclone separator body; The upper housing is located at the upper part of the cyclone separator body; A connecting pipe connects the interior of the cyclone separator body to the interior of the upper casing; and A defoaming tube is inserted into the connecting tube. The cyclone separator-type foreign matter separation device is characterized in that... The defoaming tube is provided with an eddy current holding mechanism for maintaining the eddy current generated within the defoaming tube. The vortex holding mechanism is composed of a slit for guiding the vortex circulating along the outer periphery of the defoaming tube into the interior of the defoaming tube. The slit is formed along the vertical direction on a portion of the outer periphery of the defoaming tube. A bracket is provided in the slit to connect the slit in the width direction.

2. The cyclone separator type foreign matter separation device according to claim 1, characterized in that, The defoaming tube is composed of two semi-cylindrical tubes that are eccentric to each other and have different diameters, and the slit is formed between the free edges of the two semi-cylindrical tubes in the vertical direction.

3. The cyclone separator type foreign matter separation device according to claim 1 or 2, characterized in that, A round tube or round rod is arranged in the vertical direction at the center of the defoaming tube.

Images