Defoaming machine and defoaming apparatus including the same

Abstract

To provide a defoaming machine that can crush and reduce the size of bubbles more effectively, or make them disappear completely. [Solution] The defoaming machine 1 comprises a casing 10 into which foam is drawn in, connected to one end of a pipe for sucking foam from a tank that stores cleaning water containing foam generated when the object to be cleaned is washed; an impeller 20 rotatably positioned inside the casing 10 and having blades 23 having a curved surface in which the foam-crushing surface closer to the direction of travel in the direction of rotation is formed to be recessed in the direction opposite to the direction of travel, and which rotates in conjunction with the rotation of the motor's rotation shaft to suck in foam and crush the foam to make it smaller or eliminate it by colliding with the blades 23; and an outlet 13 formed in the casing 10 for discharging the foam crushed by the impeller 20.

Description

Technical Field

[0001] The present invention relates to a defoaming machine and a defoaming device including the same.

Background Art

[0002] Patent Document 1 discloses a bubble suction device that can suck up and eliminate bubbles generated on the liquid surface of a stored liquid. In the bubble suction device disclosed in Patent Document 1, the bubbles sucked up are crushed and made smaller or disappeared by the blades of a centrifugal fan, and further, the bubbles remaining on the outer wall around the centrifugal fan are hit to crush and make the bubbles smaller or disappear.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the bubble suction device disclosed in Patent Document 1, there is a possibility that the sucked-up bubbles return to the stored liquid from the discharge port of the bubble suction device without being crushed by the blades of the centrifugal fan or the outer wall, and bubbles may remain.

[0005] The present invention has been made to solve the above problems, and an object thereof is to provide a defoaming machine that can crush and make more bubbles smaller or disappear, and a defoaming device including the same.

Means for Solving the Problems

[0006] In order to achieve the above object, the defoaming machine according to the first aspect of the present invention has one end of a pipe for sucking bubbles from a tank that stores washing water containing bubbles generated when washing an object to be washed is connected, and a casing into which the bubbles are taken in, An impeller is rotatably disposed inside the casing and has a blade having a curved surface in which the foam-crushing surface closer to the direction of travel in the direction of rotation is formed to be concave in the direction opposite to the direction of travel, and rotates in conjunction with the rotation of the motor's rotation shaft to suck in the foam and crush the foam to reduce its size or make it disappear by collision with the blade, The casing has an outlet formed therein for discharging the foam crushed by the impeller, It is equipped with.

[0007] The casing may be provided with a pipe insertion port that connects to the center of the impeller and into which one end of the pipe is inserted.

[0008] The discharge port may be used to discharge the foam crushed by the impeller to the outside of the tank.

[0009] The casing includes a cylindrical shape having a cylindrical shaft concentric with the shaft of the impeller, The impeller may compress and crush the bubbles with the bubble-crushing surface of the blades, and then crush the bubbles by causing them to collide with the inner wall of the casing due to the centrifugal force generated as the impeller rotates.

[0010] To achieve the above objective, the defoaming apparatus according to a second aspect of the present invention is: A defoaming machine according to the first aspect of the present invention, The tube for sucking up the bubbles on the liquid surface of the liquid stored in the tank, A mounting device for attaching the aforementioned pipe to the tank, It is equipped with. [Effects of the Invention]

[0011] In the defoaming machine according to the present invention, a curved surface formed by a depression in the direction opposite to the direction of travel in the rotational direction of the blades collides with the foam, compressing and crushing the foam. Therefore, in the defoaming machine according to the present invention, more foam can be crushed and reduced in size or made to disappear. [Brief explanation of the drawing]

[0012] [Figure 1] It is a perspective view showing an antifoaming device according to an embodiment of the present invention. [Figure 2] (a) It is a perspective view showing a fixture according to an embodiment of the present invention. (b) It is a perspective view showing a case where there is a lot of liquid in the tank of the fixture according to an embodiment of the present invention. (c) It is a perspective view showing a case where there is little liquid in the tank of the fixture according to an embodiment of the present invention. [Figure 3] It is a partially disassembled perspective view showing an antifoaming machine according to an embodiment of the present invention. [Figure 4] It is a perspective view showing an antifoaming machine according to an embodiment of the present invention. [Figure 5] It is a perspective view showing the antifoaming machine according to an embodiment of the present invention from another angle. [Figure 6] It is a front view showing an antifoaming machine according to an embodiment of the present invention. [Figure 7] It is a front view showing an impeller according to an embodiment of the present invention. [Figure 8] It is a cross-sectional view taken along line VIII-VIII of FIG. 1. [Figure 9] It is a cross-sectional view taken along line IX-IX of FIG. 8. [Figure 10] It is an enlarged view of the impeller in FIG. 9. [Figure 11] (a) is a diagram showing a state where the impeller in FIG. 10 collides with bubbles. (b) is an enlarged view of the impeller of the antifoaming machine according to the comparative example.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, an antifoaming machine 1 according to an embodiment of the present invention and an antifoaming device 100 including the antifoaming machine 1 will be described in detail based on the drawings. For ease of understanding, XYZ coordinates perpendicular to each other are set and referred to as appropriate.

[0014] As shown in Fig. 1, the defoaming device 100 according to this embodiment includes a defoaming machine 1, a tank 110, a fixture 120, and a pipe 130. The defoaming device 100 is a device that breaks the bubbles A generated when cleaning an object to be cleaned floating on the liquid surface of the liquid W stored inside the tank 110.

[0015] The tank 110 stores the liquid W. The liquid W in the tank 110 is the cleaning water used for cleaning vegetables. However, it is not limited to this. The liquid W in the tank 110 may be, for example, the cleaning water used for cleaning seafood including wakame or pickles. For example, cleaning water may be stored in the tank 110, and vegetables may be cleaned with the cleaning water inside the tank 110, and the cleaning water may become the liquid W. On the liquid surface of the liquid W in the tank 110, a large number of bubbles A generated by stirring when the cleaning liquid is used for cleaning and air being mixed in float.

[0016] The other end 130b of the pipe 130 is connected to the fixture 120. The fixture 120 has, for example, a guide portion 121 and a lifting portion 122. The guide portion 121 of the fixture 120 is fixed to the inner wall surface of the tank 110. The lifting portion 122 of the fixture 120 is attached to the guide portion 121 of the fixture 120 so as to be able to move up and down. As shown in Fig. 2, the lifting portion 122 of the fixture 120 is arranged on the liquid surface of the liquid W stored in the tank 110 and is provided so as to move up and down with the change in the height of the liquid surface of the liquid W. However, it is not limited to this. The fixture 120 only needs to be able to suck the bubbles A into the pipe 130. The fixture 120 may include, for example, a bubble-sealing member (not shown) for sucking the bubbles A, and the bubble-sealing member may be communicated with the pipe 130.

[0017] As shown in Fig. 1, the pipe 130 is a hose whose other end 130b is attached to the fixture 120 and one end 130a is attached to the defoaming machine 1. However, it is not limited to this. The pipe 130 only needs to be a pipe that allows liquids and gases to pass through. The pipe 130 may be, for example, a duct or a pipe. The pipe 130 is used to send the bubbles A floating on the liquid surface of the liquid W in the tank 110 to the defoaming machine 1.

[0018] The defoaming machine 1 is a device for crushing foam A. The defoaming machine 1 functions as a centrifugal fan that sucks up foam A floating on the surface of liquid W in tank 110 via pipe 130, and also functions as a foam remover that crushes the sucked-in foam A. As shown in Figures 3 to 5, the defoaming machine 1 comprises a casing 10, an impeller 20, and an electric motor 30.

[0019] The casing 10 is a housing for crushing the bubbles A inside. The casing 10 comprises a cylindrical portion 11, a lid 12, and an outlet 13.

[0020] The cylindrical portion 11 is the side wall portion of the casing 10. The cylindrical portion 11 has a cylindrical shape with the Y-axis direction as the direction of the cylindrical axis. The cylindrical axis of the cylindrical portion 11 is concentric with the axis of the impeller 20. The outer shape of the cylindrical portion 11 is a cylinder with the -Y side face open. However, it is not limited to this. The cylindrical portion 11 only needs to have an internal space formed in a cylindrical shape. For example, the cylindrical portion 11 may be a rectangular parallelepiped with a cylindrical space formed inside. The motor 30 is provided on the +Y side face of the cylindrical portion 11 and is closed off. The cylindrical portion 11 has a flange portion 11a on the +Y side.

[0021] The flange portion 11a is a flange for securing the lid 12. As shown in Figures 7 and 8, the flange portion 11a extends from the -Y side end of the cylindrical portion 11. The flange portion 11a has a substantially rectangular shape when viewed from the -Y direction. However, it is not limited to this. The flange portion 11a only needs to have a shape that can be joined to the lid 12. For example, the flange portion 11a may have a substantially circular shape when viewed from the front.

[0022] The cover 12 is a cover that closes the cylindrical portion 11. The cover 12 is provided so as to close the opening on the -Y side of the cylindrical portion 11. The cover 12 is a substantially rectangular plate when viewed from the front. However, it is not limited to this. The cover 12 only needs to be shaped in a way that it can close the opening on the -Y side of the cylindrical portion 11. For example, the cover 12 may be a substantially circular plate when viewed from the front. The cover 12 is pressed against the flange portion 11a and fixed to the flange portion 11a by bolts or the like (not shown). However, it is not limited to this. The cover 12 only needs to be fixed so as to seal the inside of the cylindrical portion 11. When the cover 12 is removed from the cylindrical portion 11, the -Y side of the cylindrical portion 11 is opened. The cover 12 has a pipe insertion port 12a, as shown in Figure 8.

[0023] The pipe insertion port 12a is a portion for attaching the pipe 130. The pipe insertion port 12a has a cylindrical shape with its axis in the Y-axis direction. The -Y side of the pipe insertion port 12a is open, and as shown in Figures 8 and 9, the +Y side of the pipe insertion port 12a leads to the inside of the casing 10. The pipe insertion port 12a leads to the center or near the center of the impeller 20. As shown in Figure 1, one end 130a of the pipe 130 is inserted into the pipe insertion port 12a and fixed in place. The pipe insertion port 12a connects the fixed pipe 130 to the inside of the casing 10. As shown in Figure 6, a pair of pipe insertion ports 12a are provided in the center of the lid 12 in a front view. However, it is not limited to this. One or three or more pipe insertion ports 12a may be provided. The pair of pipe inlets 12a may be used with a pipe 130 attached to only one of them, or with different pipes 130 attached to each of them.

[0024] The discharge port 13 is a portion for discharging the collapsed foam A to the outside of the casing 10. As shown in Figure 10, the discharge port 13 is formed in the side wall of the cylindrical portion 11. The discharge port 13 extends in the -X direction from the lower end (-Z side end) of the cylindrical portion 11. The discharge port 13 has a cylindrical shape with the X-axis direction as its axial direction. However, it is not limited to this. The discharge port 13 only needs to extend in the tangential direction of the cylindrical portion 11 so that air and liquid W flowing in the direction of travel R1 in the rotation direction R of the impeller 20 flow into it. For example, the discharge port 13 may have a cylindrical shape with the Z-axis direction as its axial direction, extending in the -Z direction from the +X side end of the cylindrical portion 11. The discharge port 13 does not require the reuse of the collapsed foam A and the sucked-in liquid W because the washing liquid for vegetables etc. does not require concentration adjustment like coolant liquid, and therefore the collapsed foam A is not returned to the inside of the tank 110 shown in Figure 1, but is discharged to the outside of the tank 110.

[0025] As shown in Figures 8 to 10, the impeller 20 is rotatably positioned inside the casing 10. The impeller 20 rotates inside the casing 10 and discharges air from inside the casing 10. The impeller 20 rotates in a clockwise direction R1 in the rotation direction R. However, it is not limited to this. The impeller 20 may rotate in the opposite direction R2 to the clockwise direction R1, in accordance with the orientation of the discharge port 13 and the shape of the impeller 20. The impeller 20 lowers the air pressure inside the casing 10 and draws bubbles A into the casing 10. The impeller 20 comprises a rotating shaft 21, side plates 22, and a plurality of blades 23.

[0026] The rotating shaft 21 is the shaft for rotating the impeller 20. The rotating shaft 21 has its axis in the Y-axis direction. The rotating shaft 21 is concentric with the cylindrical shaft of the cylindrical portion 11. The +Y end of the rotating shaft 21 penetrates the -Y side wall of the motor cover 32 of the motor 30 (described later), and is connected concentrically to the drive shaft 31a of the motor body 31 of the motor 30 (described later), and is supported so as to be rotatable in the rotation direction R. In a front view, the rotating shaft 21 is located in the center of the casing 10. In a front view, the rotating shaft 21 rotates in the direction of travel R1 by the driving force transmitted from the motor 30. However, it is not limited to this. The rotating shaft 21 may rotate in the opposite direction R2 to match the shape of the impeller 20. The rotating shaft 21 has an impeller retaining nut 21a and a shaft seal 21b.

[0027] The impeller retaining nut 21a secures the side plate 22 and the blades 23 provided on the side plate 22. The impeller retaining nut 21a is an annular-shaped component. The impeller retaining nut 21a is attached to the -Y side end of the rotating shaft 21. The impeller retaining nut 21a presses the side plate 22 around the rotating shaft 21 with its +Y side surface, securing the side plate 22 between itself and the body of the rotating shaft 21.

[0028] The shaft seal 21b seals the gap between the rotating shaft 21 and the electric motor 30. The shaft seal 21b is provided to prevent the bubbles A and liquid W that have been taken into the casing 10 from entering the inside of the electric motor 30.

[0029] The side plate 22 is a disc-shaped part attached to the rotating shaft 21. In a front view, the side plate 22 is formed in a circular shape. In a front view, the diameter of the side plate 22 is smaller than the inner diameter of the cylindrical part 11. The side plate 22 rotates around the rotating shaft 21 attached to its center. In a front view, the side plate 22 rotates in the direction of travel R1. However, it is not limited to this. For example, if the discharge port 13 extends from the lower end of the cylindrical part 11 in the +X direction, the side plate 22 may rotate in the opposite direction R2.

[0030] The blades 23 rotate to suck in and agitate the bubbles A. The blades 23 are located on the outer circumference of the -Y side of the side plate 22. The blades 23 are positioned away from the inner wall of the cylindrical portion 11 so that air can pass between them and the inner wall of the cylindrical portion 11. Furthermore, the blades 23 are also positioned away from the rotation axis 21. The blades 23 are positioned perpendicular to the side plate 22. However, this is not limited to the blades 23. The blades 23 may be positioned at an angle to the side plate 22. There are 12 blades 23. However, this is not limited to the blades 23. The number of blades 23 can vary. The 12 blades 23 are positioned to extend radially from the center to the outer circumference of the side plate 22 when viewed from the front. The blades 23 rotate together with the side plate 22. The blades 23 move the air as they rotate, and centrifugal force pushes the air toward the inner wall of the casing 10, thinning the air around the blades 23. Then, air from around the rotating shaft 21 flows around the blades 23, and further, air from the tank 110 is drawn towards the rotating shaft 21 along with the bubbles A through the pipe insertion port 12a and the pipe 130. The blades 23 have a bubble-crushing surface 23a, which is the surface closer to the direction of travel R1 in the direction of rotation R, and a back surface 23b, which is the surface opposite to the bubble-crushing surface 23a and closer to the direction of travel R2, opposite to the direction of travel R1.

[0031] The foam-crushing surface 23a captures and compresses the air and the sucked-in foam A in the formed depression. Then, the foam-crushing surface 23a sends the foam A toward the inner wall side of the cylindrical portion 11 of the casing 10 by centrifugal force. The shape of the foam-crushing surface 23a is formed as a curved surface that is recessed in the direction R2 opposite to the direction of travel R1 when viewed from the front. Because the foam-crushing surface 23a is formed as a curved surface recessed in the opposite direction R2, the load on the motor body 31, which will be described later, becomes large. However, as shown in Figures 9 and 10, because the foam-crushing surface 23a is formed as a curved surface recessed in the opposite direction R2, it can compress and crush the sucked-in foam A. For example, if no depression is formed, as in the impeller 20 of the defoamer 1A in the comparative example shown in Figure 11(b), it is not possible to capture and compress the foam A.

[0032] As shown in Figures 9 and 10, the shape of the back surface 23b is formed as a curved surface that protrudes in the opposite direction R2. Generally, if the blades of a centrifugal fan and pump protrude in the opposite direction to the direction of travel, the airflow path becomes longer, a lift force is generated in the opposite direction to the rotation direction, and the load on the motor that drives the centrifugal fan and pump increases. Therefore, the blades of a centrifugal fan and pump are not formed to protrude in the opposite direction to the direction of travel. However, the back surface 23b is formed as a curved surface that protrudes in the opposite direction R2, based on the shape of the bubble-deflating surface 23a.

[0033] The impeller of a centrifugal fan has an inlet angle θ1 that indicates the direction of airflow formed by the tangent to the inner diameter circle connecting the inner edges of multiple blades and the centerline of the inner edge of the blade, and an outlet angle θ2 that indicates the direction of airflow formed by the tangent to the outer diameter circle connecting the outer edges of multiple blades and the centerline of the inner edge of the blade. When the inlet angle θ1 is acute and the outlet angle θ2 is also acute, as in the impeller 20 of the defoamer 1A in the comparative example shown in Figure 11(b), the air resistance is reduced and the motor load is also reduced. However, in the impeller 20 of the defoamer 1A in the comparative example, the foam A flows along the curved surface on the R1 side of the direction of travel of the blade 23 and is not compressed. Therefore, the impeller 20 of the defoamer 1A in the comparative example cannot sufficiently compress and crush the foam A. Furthermore, when the inner peripheral edge 23e and outer peripheral edge 23f of the blade 23 of the comparative example defoamer 1A collide with foam A, they collide with foam A at an obtuse angle, and therefore cannot sufficiently crush foam A.

[0034] As shown in Figure 10, in the blade 23, the inlet angle θ1 formed by the tangent to the inner diameter circle S1 connecting the inner peripheral edge 23c and the blade 23 is acute, and the outlet angle θ2 formed by the tangent to the outer diameter circle S2 connecting the outer peripheral edge 23d and the blade 23 is obtuse. Because the inlet angle θ1 is acute and the outlet angle θ2 is obtuse, a bubble-depressing surface 23a is formed in the opposite direction R2. As the impeller 20 rotates, air pressure concentrates in the recessed portion of the bubble-depressing surface 23a of the blade 23, increasing the air pressure and trapping the bubble A. The bubble-depressing surface 23a of the blade 23 then compresses and crushes the bubble A with the increased air pressure, making it smaller or causing it to disappear. Furthermore, as shown in Figure 11(a), the inner peripheral edge 23e and outer peripheral edge 23f of the blade 23 collide with the bubble A at an acute angle, thereby crushing the bubble A.

[0035] The electric motor 30 is a device for operating the defoaming machine 1. As shown in Figure 8, the electric motor 30 comprises an electric motor body 31, an electric motor cover 32, and lead wires 33.

[0036] The motor body 31 generates power and transmits it to the rotating shaft 21. In a front view, it rotates the rotating shaft 21 in the rotational direction R. By rotating the rotating shaft 21, the motor body 31 rotates the entire impeller 20. The operation of the motor body 31 is controlled by a switch (not shown). The motor body 31 has a drive shaft 31a.

[0037] The motor cover 32 is a rectangular parallelepiped housing that covers the motor body 31. The motor cover 32 has a casing 10 on the -Y side.

[0038] The drive shaft 31a rotates the rotating shaft 21. The drive shaft 31a has its axial direction in the Y-axis direction. The drive shaft 31a is concentrically connected to the rotating shaft 21 and is supported so as to be rotatable in the rotational direction R.

[0039] The lead wire 33 is a cord extending from the side of the motor cover 32. The lead wire 33 is connected to the motor body 31 inside the motor cover 32. The lead wire 33 supplies power to the motor body 31.

[0040] The trolley 40 is used to move the defoaming machine 1. The trolley 40 is located on the underside of the defoaming machine 1. The trolley 40 has a plate-shaped member 41 and casters 42. The plate-shaped member 41 of the trolley 40 is located on the underside of the motor cover 32 of the motor body 31 and is formed in a plate-like shape that extends in the Y-axis direction. The casters 42 of the trolley 40 are rotatably located at the bottom of the plate-shaped member 41. The trolley 40 is used to move the defoaming machine 1 because vegetable washing is performed in various locations.

[0041] Next, we will explain how to use the defoaming machine 1 and the defoaming device 100 using the defoaming machine 1.

[0042] First, as shown in Figure 1, one end of the pipe 130 is attached to the pipe inlet 12a of the defoamer 1. Then, the other end of the pipe 130 is attached to the mounting bracket 120. Furthermore, the mounting bracket 120 is attached to the side wall of the tank 110. The mounting bracket 120 is attached to the side wall of the tank 110 and fixes the other end of the pipe 130 at a height that allows it to suck up the bubbles A floating on the surface of the liquid W in the tank 110.

[0043] Next, the electric motor 30 of the defoaming machine 1 is started. As the electric motor body 31 inside the started electric motor 30 rotates, the rotation shaft 21 of the impeller 20 rotates in the direction of travel R1 when viewed from the front, as shown in Figure 10. As the rotation shaft 21 rotates in the direction of travel R1, the side plates 22 and blades 23 of the impeller 20 also rotate in the direction of travel R1 when viewed from the front. The rotating blades 23 move the air, and centrifugal force sends the air toward the inner wall side of the cylindrical portion 11 of the casing 10 along the outlet angle θ2. The air sent toward the inner wall side of the cylindrical portion 11 by the blades 23 flows toward the direction of travel R1 along the inner wall of the cylindrical portion 11 and is discharged to the outside of the casing 10 from the discharge port 13 which extends tangentially to the cylindrical portion 11.

[0044] When the air inside the casing 10 is discharged by the impeller 20, the air inside the pipe 130 flows into the casing 10, where the air density has decreased, through the pipe inlet 12a. Then, the bubbles A floating on the surface of the liquid W in the tank 110 are sucked in together with the air and liquid W from the other end of the pipe 130, which is fixed at a height that allows the fixture 120 to suck in the bubbles A.

[0045] The foam A, which is drawn into the pipe 130, is taken into the casing 10 through one end of the pipe 130 attached to the pipe insertion port 12a. The foam A is discharged to the center of the casing 10 and flows towards the rotating blades 23, carried by the airflow.

[0046] The rotating blades 23 capture bubbles A in depressions formed on the bubble-crushing surface 23a. The rotating blades 23 crush and reduce the size of bubbles A by colliding with them, or cause them to disappear. Then, air pressure is concentrated in the depressions on the bubble-crushing surface 23a of the blades 23, and the remaining bubbles A are compressed and crushed, becoming smaller or disappearing. The blades 23, using centrifugal force generated by rotation, send the crushed bubbles A and the remaining bubbles A toward the inner wall of the cylindrical portion 11 of the casing 10, where they collide with the inner wall of the cylindrical portion 11, crushing and reducing the size of the remaining bubbles A or causing them to disappear. The bubbles A are almost completely crushed by the blades 23 and become liquid W.

[0047] The collapsed foam A flows along the inner wall of the cylindrical section 11 in the direction of travel R1 along with the air and liquid W, and is discharged to the outside of the casing 10 through the discharge port 13 which extends tangentially to the cylindrical section 11. The collapsed foam A is not returned to the tank 110, but is discharged to the outside of the tank 110 along with the sucked-in liquid W.

[0048] As described above, in the defoamer 1 according to this embodiment, the blades 23 capture the foam A in the depressions formed on the foam-crushing surface 23a. The foam A is then compressed and crushed by the air pressure concentrated in the depressions on the foam-crushing surface 23a.

[0049] Generally, in order to reduce the load on the motor that drives the centrifugal fan, the surface of the blades 23 on the side of the direction of travel R1 is formed so that air and the like can flow with little resistance, as in the impeller 20 of the defoamer 1A in the comparative example shown in Figure 11(b). However, in the defoamer 1 according to this embodiment, as shown in Figure 10, the foam crushing surface 23a, which is a curved surface recessed in the opposite direction R2 of the blades 23, captures, compresses, and crushes the foam A. Therefore, the defoamer 1 according to this embodiment can crush more foam A.

[0050] In the defoaming machine 1 according to this embodiment, the crushed foam A and the sucked-in liquid W are not returned to the tank 110 but are discharged to the outside of the tank 110. In the defoaming machine 1 according to this embodiment, the washing liquid for vegetables, etc., does not require concentration adjustment like coolant liquid, so there is no need to reuse the crushed foam A and the sucked-in liquid W. Furthermore, debris inside the liquid W in the tank 110, such as fragments of vegetables unsuitable for sale and solidified scum generated during washing, tends to float on the surface of the liquid W, and the defoaming machine 1 may also suck in debris. However, since the defoaming machine 1 does not return the crushed foam A and the sucked-in liquid W to the tank 110 but discharges them to the outside of the tank 110, debris can be removed from the liquid W in the tank 110.

[0051] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above.

[0052] In the above embodiment, the motor body 31 rotates the rotation shaft 21 in the direction of travel R1 when viewed from the front. However, it is not limited to this. The motor body 31 may also rotate the rotation shaft 21 in the opposite direction R2 when viewed from the front. The discharge port 13 extends in the +X direction from the lower end of the cylindrical portion 11. Furthermore, the bubble-crushing surface 23a and the back surface 23b of the blade 23 are opposite sides.

[0053] In the above embodiment, the defoamer 1 crushes the foam A with the blades 23 of the impeller 20, and further crushes the foam A by slamming it against the inner wall of the casing 10 using centrifugal force. Furthermore, the defoamer 1 may be provided with a bubble removal filter for crushing the foam A.

[0054] In the above embodiment, the shape of the bubble-crushing surface 23a is formed as a curved surface that is recessed in the direction R2 opposite to the direction of travel R1 in the rotation direction R. However, it is not limited to this. The shape of the bubble-crushing surface 23a is sufficient as long as it can capture bubbles A. The shape of the bubble-crushing surface 23a may, for example, have an L-shaped bend.

[0055] In the above embodiment, the defoamer 1 sucks foam A from the tank 110 via the mounting fixture 120 and the pipe 130. However, it is not limited to this. The defoamer 1 may be attached directly to the side wall of the tank 110, for example.

[0056] This invention can be implemented in various forms and modified without departing from the broad spirit and scope of the invention. Furthermore, the embodiments described above are for illustrative purposes only and do not limit the scope of the invention. [Explanation of Symbols]

[0057] 1 Defoaming machine 1A Defoaming machine according to comparative example 10 Casing 11 Cylindrical section 11a Flange section 12 Lid 12a Pipe insertion port 13 Outlet 20-spindle wheel 21 Rotation axis 21a Impeller retaining nut 21b Axle seal 22 Side panels 23 feathers 23a Foam-reducing surface 23b Reverse side 23c, 23e Inner peripheral edge 23d, 23f Outer edge 30 Electric motor 31 Electric motor body 31a Drive shaft 32 Electric motor cover 33 Lead wires 40 bogies 41 Plate-shaped member 42 Caster 100 Defoaming device 110 tanks 120 Mounting hardware 121 Guide section 122 Lifting section 130 tube 130a one end 130b Other end A bubble W liquid R rotation direction R1 Direction of travel R2 Opposite direction θ1 Entrance angle θ2 Exit angle S1 Inner diameter circle S2 Outer diameter circle

Claims

1. A casing into which the foam is drawn is connected, with one end of a pipe connected to a tank that stores cleaning water containing foam generated when the object to be cleaned is being cleaned, An impeller is rotatably disposed inside the casing and has a blade having a curved surface in which the foam-crushing surface closer to the direction of travel in the direction of rotation is formed to be concave in the direction opposite to the direction of travel, and rotates in conjunction with the rotation of the motor's rotation shaft to suck in the foam and crush the foam to reduce its size or make it disappear by collision with the blade, The casing has an outlet formed therein for discharging the foam crushed by the impeller, A defoaming machine equipped with the following features.

2. The defoaming machine according to claim 1, further comprising a pipe insertion port provided in the casing, which is connected to the center of the impeller and into which one end of the pipe is inserted.

3. The defoaming machine according to claim 1, wherein the discharge port discharges the foam crushed by the impeller to the outside of the tank.

4. The casing includes a cylindrical shape having a cylindrical shaft concentric with the shaft of the impeller, The defoaming machine according to claim 1, wherein the impeller compresses and crushes the foam with the foam-crushing surface of the blades, and crushes the foam by causing it to collide with the inner wall of the casing due to the centrifugal force generated as the impeller rotates.

5. A defoaming machine according to any one of claims 1 to 4, The tube for sucking up the bubbles on the liquid surface of the liquid stored in the tank, A mounting device for attaching the aforementioned pipe to the tank, A defoaming device equipped with the following features.

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