Physical defoaming device

Abstract

The present invention relates to the technical field of defoaming, and provides a physical defoaming device, comprising a defoaming impeller for eliminating foam and a motor for driving the defoaming impeller to rotate, wherein an impeller connecting shaft of the defoaming impeller is coaxially connected to a motor shaft of the motor. The physical defoaming device further comprises a housing for accommodating the defoaming impeller, wherein the housing is internally provided with a transversely placed bottom plate, a suction inlet for suctioning a foam liquid is formed in the bottom plate, the defoaming impeller is in contact with the bottom plate, and a working area formed by the rotation of the defoaming impeller covers the suction inlet. The physical defoaming device of the present invention can physically eliminate foam by means of the defoaming impeller, and the bottom plate having the suction inlet is provided in the housing to achieve a certain sealing effect in conjunction with the defoaming impeller, and due to the sealing effect, the impeller can efficiently draw in foam. In addition, a groove can also be designed on the bottom plate, so that the defoaming impeller is no longer worn on the bottom plate, and the service life of the defoaming impeller is prolonged.

Description

A physical defoaming device TECHNICAL FIELD

[0001] The present application relates to the technical field of defoaming, in particular to a physical defoaming device. BACKGROUND

[0002] In the fields of steel, chemical industry, medicine, food, etc., some bubbles which are not beneficial to production are produced due to the chemical medium used in production. If the bubbles are not treated in time and effectively, the production process and equipment will be damaged, the production equipment will be damaged, the product quality will be affected, and even the production capacity will be reduced. For example, in the field of steel strip processing, a degreasing section is needed to clean the surface of the strip steel containing oil, scale powder, iron powder, carbon powder and other contaminants after rolling. Because the degreasing agent contains surfactant components, under the influence of stirring and temperature factors, the degreasing agent will wrap air to produce a large amount of bubbles. The bubbles overflowing the container will cause damage to the surrounding motor and environmental pollution. The bubbles overflowing into the strip cleaning tank will affect the cleaning effect of the strip.

[0003] At present, the chemical defoaming method of adding defoaming agent to the easily foaming medium is mostly used for defoaming. For example, patents ZL200820218185.3 and ZL200820012731.8 disclose a defoaming method and equipment by adding a defoaming agent. However, the defoaming agent used in this chemical defoaming method generally has an inhibitory effect on the active components in the easily foaming medium, and even some will produce precipitates to block the system pipeline and equipment. The defoaming agent is continuously added according to the condition of the easily foaming medium, which consumes a large amount of production cost. Moreover, the defoaming agent itself generally contains organic silicon or polyether and other difficult-to-degrade organic matters, which increases the difficulty and cost of water treatment. If the ordinary mechanical defoaming method is used, the container for storing the easily foaming medium will cause the pressure in the container to change due to the easily foaming medium itself, and the obvious upward airflow formed after the bubbles are broken will also carry the unbroken bubbles to flow over the impeller, so that the bubbles will damage the motor and other mechanisms of the mechanical defoaming device, and even directly overflow outside the container to cause harm. SUMMARY

[0004] The purpose of the present application is to provide a physical defoaming device which can at least solve some defects in the prior art.

[0005] To achieve the above purpose, the embodiments of the present application provide the following technical scheme: a physical defoaming device, comprising a defoaming impeller for eliminating bubbles and a motor for driving the defoaming impeller to rotate, the impeller connecting shaft of the defoaming impeller is coaxially connected with the motor shaft, further comprising a housing for accommodating the defoaming impeller, the housing has a transversely arranged bottom plate, the bottom plate has a suction inlet for sucking bubble liquid, the defoaming impeller contacts the bottom plate, and the working area formed by the rotation of the defoaming impeller covers the suction inlet.

[0006] Further, a groove is arranged on the bottom plate for the bottom of the defoaming impeller to extend into.

[0007] Further, the shell is formed with a suction section at the bottom plate, and the suction section is arranged with a port ring.

[0008] Further, a liquid blocking assembly for blocking liquid from entering the motor is further included, and the liquid blocking assembly is arranged on the impeller connecting shaft.

[0009] Further, a support for supporting the motor is further included, and the support is provided with a liquid blocking chamber for the liquid blocking assembly.

[0010] Further, the support includes a first support body and a second support body arranged in a stack, and the liquid blocking chamber is formed between the first support body and the second support body.

[0011] Further, the liquid blocking assembly includes a shaft sleeve arranged on the impeller connecting shaft, and the shaft sleeve is arranged close to the motor.

[0012] Further, the liquid blocking assembly further includes a mechanical seal structure arranged on the impeller connecting shaft, and the mechanical seal structure is at least partially arranged in the support.

[0013] Further, a sliding bearing with a shaft sleeve is further included, and the inside of the shaft sleeve is arranged on the impeller connecting shaft, and the outside of the shaft sleeve is provided with a spiral water groove.

[0014] Further, the shaft sleeve is threadedly connected to the impeller connecting shaft.

[0015] Compared with the prior art, the physical defoaming device has the following beneficial effects: the physical defoaming device can physically eliminate foam through the defoaming impeller, and can form a certain sealing effect in cooperation with the defoaming impeller through the bottom plate with a suction port arranged in the shell, so that the sealing effect can enable the impeller to efficiently suck in the foam; in addition, a groove can be designed on the bottom plate, so that the defoaming impeller will not be abraded on the bottom plate, thereby prolonging the service life of the defoaming impeller. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a cross-sectional view of a physical defoaming device according to an embodiment of the present application from a front view (showing a sliding bearing arranged at an end);

[0017] Fig. 2 is a schematic view of a physical defoaming device according to an embodiment of the present application from a top view;

[0018] Fig. 3 is a cross-sectional view of a physical defoaming device according to an embodiment of the present application from a front view (showing a first support body and a second support body);

[0019] Fig. 4 is a schematic view of a physical defoaming device according to an embodiment of the present application (showing the overall support) in a front view;

[0020] Fig. 5 is a schematic view of a physical defoaming device according to an embodiment of the present application (showing the bottom plate) in a front view;

[0021] In the figure: 1 - motor, 2 - support, 3 - shaft sleeve, 4 - impeller connecting shaft, 5 - mechanical seal structure, 6 - mounting base, 7 - shell, 8 - defoaming impeller, 9 - sliding bearing, 10 - ring, 11 - flow guide box, 12 - suction section, 13 - impeller nut; 14 - first frame body; 15 - second frame body; 16 - shaft coupling; 17 - support frame; 18 - rolling bearing; 19 - bottom plate; 20 - suction port; 21 - groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] Please refer to Fig. 1 to Fig. 5, the embodiment of the present application provides a physical defoaming device, comprising a defoaming impeller 8 for eliminating foam and a motor 1 for driving the defoaming impeller 8 to rotate, the impeller connecting shaft 4 of the defoaming impeller 8 is coaxially connected with the motor shaft of the motor 1, the end of the impeller connecting shaft 4 away from the motor 1 is provided with a sliding bearing 9, and the defoaming impeller 8 is located between the sliding bearing 9 and the motor 1. In the embodiment, the defoaming impeller 8 can physically eliminate foam, and the sliding bearing 9 is installed at the end of the impeller connecting shaft 4, and forms two-end support with the bearing in the motor 1, which can better realize the functions of shock absorption and support compared with center support; in addition, the device also comprises a housing 7 for accommodating the defoaming impeller 8, the bottom of the housing 7 has a suction section 12, and the sliding bearing 9 at least partially extends out of the suction section 12, so that the sliding bearing 9 is in the suction pipeline, the foam sucked by the impeller can be used as lubrication, the self-flushing effect is realized, an external flushing water pipe is not needed, energy is saved, and installation and use are facilitated. Specifically, the sliding bearing 9 is ingeniously arranged at the end of the impeller connecting shaft 4, and forms two-end support with the bearing in the motor 1, which can better realize the functions of shock absorption and support compared with center support. At the same time, when the sliding bearing 9 is arranged, it can extend out of the suction section 12 to realize self-flushing. The motor 1 can be one of a power frequency motor 1 and a variable frequency motor 1, one of explosion-proof and non-explosion-proof, and one of high efficiency and ordinary type. The impeller connecting shaft 4 is clamped once, and the whole shaft is finished by machining once. The impeller connecting shaft 4 solves the reliable connection between the motor 1 and the defoaming impeller 8, has good concentricity, and the device runs reliably and stably. The impeller connecting shaft 4 can also be customized in length according to the site environment. The defoaming impeller 8 can be one or a plurality of combined type impellers, and the impeller can be an axial flow type impeller or a fan type impeller. In addition, the impeller can be a plate type welded impeller or a cast impeller, and the embodiment is not limited in this regard.

[0024] Please refer to Fig. 1 to Fig. 5, the suction section 12 is provided with a mouth ring 10, which can prevent wear and tear, increase the sealing of the impeller suction port 20, improve the suction force of the impeller, prevent internal circulation, and increase the efficiency of the impeller.

[0025] Please refer to Fig. 1 to Fig. 5, the device also comprises a liquid blocking assembly for blocking liquid from entering the motor 1, and the liquid blocking assembly is arranged on the impeller connecting shaft 4. The liquid blocking assembly can prevent liquid from entering the motor 1 and prevent damage to the motor 1.

[0026] Please refer to Fig. 1 to Fig. 5, the device also comprises a support 2 for supporting the motor 1, and the support 2 has a liquid blocking chamber for arranging the liquid blocking assembly. In the embodiment, the upper and lower surfaces of the support 2 are machined once, have good concentricity, and have stop lips on the upper and lower surfaces to enable the motor 1 and the bottom plate 19 to be concentrically installed, which provides space for adding the liquid blocking assembly.

[0027] Please refer to FIG. 3, the bracket 2 includes a first frame body 14 and a second frame body 15 stacked one above the other, and the liquid blocking chamber is formed between the first frame body 14 and the second frame body 15. In this embodiment, the bracket 2 can be refined into the first frame body 14 and the second frame body 15, and the split frame structure can provide a larger liquid blocking chamber. By stacking the first frame body 14 and the second frame body 15, the bracket 2 not only supports the motor 1 and provides space for the installation of the liquid blocking assembly, but also can be independently installed and disassembled, thereby reducing the processing cost and facilitating installation and use. Specifically, the bracket 2 can be detachably installed between the motor 1 and the mounting base 6, and can be disassembled and assembled as needed. The second frame body 15 is supported on the mounting base 6 and supports the first frame body 14, and the motor 1 is placed on the first frame body 14. The first frame body 14 and the second frame body 15 are in a cylindrical structure, which can be a cylinder or a square cylinder. In this way, a liquid blocking chamber can be formed inside to accommodate the liquid blocking assembly. The upper and lower surfaces of the first frame body 14 are machined in one clamping process, and the concentricity is good. The upper and lower surfaces have a stop to enable the motor 1 and the second frame body 15 to be concentrically installed. In this split bracket 2, the bracket 2 can also be in an integral type, and the bracket 2 extends into the liquid blocking chamber to form a box body of the rolling bearing 18, and the rolling bearing 18 is arranged in the box body, as shown in FIG. 4.

[0028] Please refer to FIGS. 1 to 5, the liquid blocking assembly can adopt one or more of the rolling bearing 18, the mechanical seal structure 5, and the shaft sleeve 3.

[0029] Please refer to FIGS. 1 to 5, the liquid blocking assembly includes the shaft sleeve 3 arranged on the impeller connecting shaft 4, and the shaft sleeve 3 is arranged close to the motor 1. In this embodiment, the shaft sleeve 3 is fastened by bolts to make the inclined surface fasten the large surface, and finally the impeller connecting shaft 4 fastens the motor 1 shaft firmly. This part helps to solve the problem that even if the mechanical seal leaks, the process medium and foam will also be blocked from leaking into the motor 1, which can cause a serious accident of burning the motor 1.

[0030] Please refer to FIG. 1 to FIG. 5, the liquid blocking assembly comprises a rolling bearing 18 arranged on the impeller connecting shaft 4, the second frame body 15 extends into the liquid blocking chamber to form a support frame 17, and the support frame 17 is connected with the rolling bearing 18. Preferably, the support frame 17 and a box of the rolling bearing 18 are in an integrated structure. In the embodiment, the support frame 17 can be extended from the second frame body 15 to support the rolling bearing 18. The rolling bearing 18 can adopt an angular contact ball bearing or a deep groove ball bearing, which can balance axial force and radial force at the same time. The angular contact ball bearing or the deep groove ball bearing can be arranged in the box. The box can be oil sealed to prevent oil leakage and liquid rising. The rolling bearing 18 can support the impeller connecting shaft 4, reduce friction and wear, and reduce noise. The box can be manufactured in batches with the support frame 17 or in an integrated manner.

[0031] Please refer to FIG. 1 to FIG. 5, the liquid blocking assembly further comprises a mechanical seal structure 5 arranged on the impeller connecting shaft 4, and the mechanical seal structure 5 is at least partially arranged in the liquid blocking chamber. In the embodiment, the mechanical seal can adopt a canned seal to reduce installation difficulty, block liquid rising in a sealing cavity through an O-ring, form a seal through high-speed rotation friction of a sealing surface, and prevent liquid leakage from causing environmental pollution.

[0032] Please refer to FIG. 1 to FIG. 5, the device further comprises a shaft coupling 16 for connecting the impeller connecting shaft 4 and a shaft of the motor 1, and the shaft coupling 16 is located in the liquid blocking chamber. In the embodiment, the shaft coupling 16 is used for connecting the shaft of the motor 1 and the impeller connecting shaft 4, and plays a role in transmitting torque and buffering and damping. This part helps to solve the problem that even if the mechanical seal structure 5 leaks, process medium and foam can be blocked from leaking to the motor 1, thereby avoiding a serious accident of burning the motor 1.

[0033] Please refer to FIG. 1 to FIG. 5, the device further comprises a mounting base 6 for supporting the second frame body 15, and the defoaming impeller 8 is located below the mounting base 6. In the embodiment, the mounting base 6 can be one of a circular flange, a square flange, and a steel frame.

[0034] Please refer to FIG. 1 to FIG. 5, the device further comprises a housing 7 arranged below the mounting base 6, and the defoaming impeller 8 is located in the housing 7. In the embodiment, the housing 7 is in a cylindrical shape or a rectangular shape. Preferably, the bottom of the housing 7 is provided with a suction section 12. A flow guide box 11 is arranged between the suction section 12 and the housing 7. The suction section 12 is a suction pipe with a welded horn at the bottom, and a cross-shaped rib is welded at the bottom to prevent deformation and improve suction efficiency. The flow guide box 11 is a plate type welded with multiple threaded structures, and a small column is welded on the upper surface of the suction section 12, and the small column is connected with the housing 7 through threads. Preferably, a ring 10 is arranged between the suction pipe and the inner hole of the impeller to prevent wear, increase the sealing of an impeller inlet 20, improve the suction of the impeller, prevent internal circulation, and increase the efficiency of the impeller.

[0035] Please refer to FIG. 1 to FIG. 5, the device further comprises a housing 7 arranged below the mounting base 6, and the defoaming impeller 8 is located in the housing 7. In the embodiment, the housing 7 is in a cylindrical shape or a rectangular shape. Preferably, the bottom of the housing 7 is provided with a suction section 12. A flow guide box 11 is arranged between the suction section 12 and the housing 7. The suction section 12 is a suction pipe with a welded horn at the bottom, and a cross-shaped rib is welded at the bottom to prevent deformation and improve suction efficiency. The flow guide box 11 is a plate type welded with multiple threaded structures, and a small column is welded on the upper surface of the suction section 12, and the small column is connected with the housing 7 through threads. Preferably, a ring 10 is arranged between the suction pipe and the inner hole of the impeller to prevent wear, increase the sealing of an impeller inlet 20, improve the suction of the impeller, prevent internal circulation, and increase the efficiency of the impeller.

[0036] Please refer to FIG. 1 to FIG. 5, the device further comprises an impeller nut 13, which fastens the defoaming impeller 8 on the impeller connecting shaft 4, ensures stable and reliable operation, and avoids the problem of part falling off during installation and operation.

[0037] Please refer to Fig. 5, the shell 7 has a transverse bottom plate 19 with a suction port 20 for sucking foam liquid, the defoaming impeller 8 contacts the bottom plate 19, and the working area formed by the rotation of the defoaming impeller 8 covers the suction port 20. Preferably, the bottom plate 19 is provided with a groove 21 for the bottom of the defoaming impeller 8 to extend into. The shell 7 is formed with a suction section 12 at the bottom plate 19, and the suction section 12 is provided with a mouth ring 10. In this embodiment, by arranging the bottom plate 19 with the suction port 20 in the shell 7, a certain sealing effect can be achieved in cooperation with the defoaming impeller 8, and the sealing effect can enable the impeller to efficiently suck foam; in addition, the groove 21 can be designed on the bottom plate 19, so that the defoaming impeller 8 will not be worn on the bottom plate 19, thereby prolonging the service life of the defoaming impeller 8. Specifically, by designing the defoaming impeller 8 to contact the bottom plate 19, the two can be parallel and absolutely smooth, and when the defoaming impeller 8 rotates at high speed, a sealing effect can be formed to efficiently suck foam liquid. When it is not easy to achieve absolute smoothness or parallelism, the groove 21 can be designed, which does not affect the sealing and can avoid the wear of the defoaming impeller 8 and the bottom plate 19 caused by the friction between the defoaming impeller 8 and the bottom plate 19.

[0038] The working principle of the device is as follows:

[0039] The defoaming device mounting base 7 is installed on the top of the container according to the matching size of the container, and the motor 1 is firmly connected to the mounting base 7 by using the motor bracket 2. The motor 1 drives the defoaming impeller 8 to rotate through the joint shaft expansion sleeve 3, the impeller connecting shaft 4, the mechanical seal 5, and the sliding bearing 6. After the defoaming impeller 8 rotates, a suction force is formed, and the foam generated on the surface of the container is sucked into the inlet of the defoaming impeller 8 through the suction section at the bottom of the shell 9 arranged along the shape of the container. The defoaming impeller 8 uses the shear force and compression effect generated by the impeller to break the bubbles, and the gas and liquid are separated. The liquid is thrown to the side wall of the shell 9 by the inertial force, and the liquid after defoaming flows along the side wall of the shell 9 to the liquid outlet hole. The liquid after defoaming is further dissipated into the container to avoid conflict with the foam flow, and the liquid flow is guided to flow downward, thereby completely isolating the foam flow and the liquid flow in the container from the motor 1. The bottom plate of the defoaming impeller 8 and the shell 9 form a seal in a certain shape, which improves the suction efficiency of the defoaming impeller 8 and ensures that the impeller will not be worn while efficiently sucking. Even if the mechanical seal 5 is damaged, the foam flow or liquid flow will be intercepted by the joint shaft expansion sleeve 3, and the motor 1 will not be damaged. The mouth ring 10 is arranged between the suction inlet pipeline and the inner hole of the impeller, which increases the sealing of the suction inlet of the impeller, reduces wear, improves the suction force of the impeller, prevents internal circulation, and increases the efficiency of the impeller.

[0040] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A physical defoaming device, comprising a defoaming impeller for eliminating foam and a motor for driving the defoaming impeller to rotate, wherein the impeller connecting shaft of the defoaming impeller is coaxially connected to the motor shaft of the motor, characterized in that: The shell further comprises a bottom plate arranged horizontally in the shell, the bottom plate is provided with suction ports for sucking the foam liquid, the defoaming impeller contacts the bottom plate, and a working area formed by rotation of the defoaming impeller covers the suction ports.

2. A physical defoaming device as claimed in claim 1, characterized in that: The bottom plate is provided with a groove for the bottom of the defoaming impeller to extend into.

3. A physical defoaming device as claimed in claim 1, characterized in that: The shell is formed with a suction section at the bottom plate, and the suction section is provided with a port ring.

4. A physical defoaming device as claimed in claim 1, characterized in that: The shell further comprises a liquid blocking assembly for blocking liquid from entering the motor, and the liquid blocking assembly is arranged on the impeller connecting shaft.

5. A physical defoaming device as claimed in claim 4, characterised in that: The shell further comprises a support for supporting the motor, and the support is provided with a liquid blocking chamber for arranging the liquid blocking assembly.

6. A physical defoaming device as claimed in claim 5, characterised in that: The support comprises a first support body and a second support body arranged in a stack, and the liquid blocking chamber is formed between the first support body and the second support body.

7. A physical defoaming device as claimed in claim 4, characterised in that: The liquid blocking assembly comprises a shaft sleeve arranged on the impeller connecting shaft, and the shaft sleeve is arranged close to the motor.

8. A physical defoaming device as claimed in claim 5, characterized in that: The liquid blocking assembly further comprises a mechanical seal structure arranged on the impeller connecting shaft, and the mechanical seal structure is at least partially arranged in the support.

9. A physical defoaming device as claimed in claim 1, characterized in that: The shell further comprises a sliding bearing provided with a shaft sleeve, an inner part of the shaft sleeve is arranged on the impeller connecting shaft, and an outer part of the shaft sleeve is provided with a spiral water groove.

10. A physical defoaming device as claimed in claim 9, characterised in that: The shaft sleeve is threadedly connected to the impeller connecting shaft.

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