Physical defoaming device

Abstract

The utility model relates to the technical field of defoaming, and provides a physical defoaming device which comprises a defoaming impeller used for defoaming, a motor used for driving the defoaming impeller to rotate and a shell used for containing the defoaming impeller, an impeller connecting shaft of the defoaming impeller is coaxially connected with a motor shaft of the motor, and the defoaming impeller is arranged in the shell. A transverse bottom plate is arranged in the shell, the bottom plate is provided with a suction inlet for sucking foam liquid, the defoaming impeller is in contact with the bottom plate, and a working area formed by rotation of the defoaming impeller covers the suction inlet. According to the physical defoaming device, foam can be physically eliminated through the defoaming impeller, the bottom plate with the suction inlet is arranged in the shell and can be matched with the defoaming impeller to form a certain sealing effect, and the impeller can efficiently suck the foam through the sealing effect; besides, a groove can be designed on the bottom plate, so that the defoaming impeller cannot be abraded on the bottom plate, and the service life of the defoaming impeller is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of defoaming, in particular to a physical defoaming device. Background Art

[0002] In the fields of steel, chemical industry, medicine, food, etc., due to production requirements, the chemical media used are prone to generate some foams that are not beneficial to production. If the foams are not treated in a timely and effective manner, they will cause harm to the production process and equipment, damage the production equipment, affect the product quality, and even reduce the production capacity. For example, in the field of steel strip processing, a degreasing section needs to be set to clean the surface of the strip steel containing dirt such as grease, scale powder, iron powder, carbon powder, etc. after rolling. Due to the surfactant component in the degreasing agent, under the influence of stirring and temperature factors, the degreasing agent will wrap air to generate a large amount of foams. After the foams overflow from the container, they will cause damage to the surrounding motors and environmental pollution. After the foams flow into the strip steel cleaning tank, they will affect the strip steel cleaning effect.

[0003] Currently, most defoaming is carried out by the chemical defoaming method of adding defoamers to the foaming medium. For example, patents ZL200820218185.3 and ZL200820012731.8 disclose defoaming methods and devices for adding defoamers. However, the defoamers used in this chemical defoaming method generally have an inhibitory effect on the active components in the foaming medium, and even some will produce precipitates to block the system pipelines and equipment. The defoamers are continuously added according to the conditions of the foaming medium, consuming a large amount of production costs, and the defoamers themselves generally contain difficult-to-degrade organic substances such as silicone or polyether, increasing the difficulty and cost of water treatment. If ordinary mechanical defoaming methods are used, for the container storing the foaming medium, due to the pressure change in the container caused by the foaming medium itself and the obvious upward air flow formed after the foam breaks, both will entrain the unbroken foam flow to cross over the impeller, so the foam will damage the motor and other mechanisms of the mechanical defoaming device, and even directly overflow outside the container to cause harm. Content of the Utility Model

[0004] The purpose of the utility model 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 embodiment of the utility model provides the following technical scheme: a physical defoaming device, including a defoaming impeller for eliminating foam 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 of the motor. It further includes a housing for accommodating the defoaming impeller. The housing has a horizontally arranged bottom plate. The bottom plate has a suction port for sucking in the foaming liquid. The defoaming impeller contacts the bottom plate, and the working area formed by the rotation of the defoaming impeller covers the suction port.

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

[0007] Further, an inhalation section is formed at the bottom plate of the housing, and a gland is provided on the inhalation section.

[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 bracket for supporting the motor is further included, and the bracket has a liquid blocking chamber for arranging the liquid blocking assembly.

[0010] Further, the bracket includes a first frame body and a second frame body stacked up and down, and the liquid blocking chamber is formed between the first frame body and the second frame body.

[0011] Further, the liquid blocking assembly includes a shaft sleeve expansion sleeve arranged on the impeller connecting shaft, and the shaft sleeve expansion 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 at least part of the mechanical seal structure is placed inside the bracket.

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

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

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: a physical defoaming device can physically eliminate foam through a defoaming impeller, and by arranging a bottom plate with a suction port inside the housing, a certain sealing effect can be formed in cooperation with the defoaming impeller, and the sealing effect can enable the impeller to efficiently inhale foam; in addition, a groove can be designed on the bottom plate, so that the defoaming impeller will not be worn on the bottom plate, and the service life of the defoaming impeller is prolonged. Description of the Drawings

[0016] Figure 1 It is a schematic cross-sectional view of a physical defoaming device provided by an embodiment of the present utility model from the main view perspective (showing a sliding bearing arranged at the end);

[0017] Figure 2 It is a schematic view of a physical defoaming device provided by an embodiment of the present utility model from the top view perspective;

[0018] Figure 3 It is a schematic cross-sectional view of a physical defoaming device provided by an embodiment of the present utility model from the main view perspective (showing the first frame body and the second frame body);

[0019] Figure 4 A schematic cross-sectional view of the main viewing angle of a physical defoaming device provided by an embodiment of the present invention (showing the overall bracket);

[0020] Figure 5 A schematic cross-sectional view of the main viewing angle of a physical defoaming device provided by an embodiment of the present invention (showing the bottom plate);

[0021] In the attached drawing reference numerals: 1 - motor, 2 - bracket, 3 - shaft expansion sleeve, 4 - impeller connecting shaft, 5 - mechanical seal structure, 6 - mounting base, 7 - housing, 8 - defoaming impeller, 9 - sliding bearing, 10 - stuffing box, 11 - guide vane housing, 12 - suction section, 13 - impeller nut; 14 - first frame; 15 - second frame; 16 - coupling; 17 - support frame; 18 - rolling bearing; 19 - bottom plate; 20 - suction port; 21 - groove. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 to 5, an embodiment of the present utility model provides a physical defoaming device, which includes 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. A sliding bearing 9 is provided at one end of the impeller connecting shaft 4 away from the motor 1. The defoaming impeller 8 is located between the sliding bearing 9 and the motor 1. In this 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 to form two-end supports with the bearing inside the motor 1, which can better achieve the functions of shock absorption and support compared with the central support. In addition, the device further includes a housing 7 for accommodating the defoaming impeller 8. The bottom of the housing 7 has a suction section 12. At least a part of the sliding bearing 9 extends out of the suction section 12, so that the sliding bearing 9 can be in the suction pipeline, and the foam sucked by the impeller can be used as lubrication to achieve the self-flushing effect, without the need for an external flushing water pipe, saving energy and being convenient for installation and use. Specifically, in this embodiment, the sliding bearing 9 is cleverly arranged at the end of the impeller connecting shaft 4 to form two-end supports with the bearing inside the motor 1, which can better achieve the functions of shock absorption and support compared with the central support. At the same time, when setting the sliding bearing 9, it can be made to extend out of the suction section 12 to achieve self-flushing. The motor 1 can be one of a power frequency motor 1, a variable frequency motor 1, one of explosion-proof and non-explosion-proof, and one of high-efficiency and ordinary types. The entire impeller connecting shaft 4 is clamped once, and the whole shaft is machined by turning 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 smoothly. The length of the impeller connecting shaft 4 can also be customized according to the on-site environment. The defoaming impeller 8 can be a single one or a combination of multiple impellers. The impeller can be an axial flow type impeller or a fan type impeller. In addition, the impeller can be a plate-welded impeller or a cast impeller. This embodiment does not make any limitations in this regard.

[0024] Please refer to Figures 1 to 5 , a mouth ring 10 is provided on the suction section 12, which can prevent wear, increase the seal 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 Figures 1 to 5 , the device further includes a liquid blocking component for blocking liquid from entering the motor 1, and the liquid blocking component is arranged on the impeller connecting shaft 4. The liquid blocking component can prevent liquid from entering the motor 1 and prevent damage to the motor 1.

[0026] Please refer to Figures 1 to 5 , Please refer to Figures 1 to 5, the device further includes a bracket 2 for supporting the motor 1, and the bracket 2 has a liquid retaining chamber for arranging the liquid retaining component. In this embodiment, the upper and lower surfaces of the bracket 2 are machined in one clamping, with good concentricity. There are rabbets on both the upper and lower surfaces to concentrically install the motor 1 and the bottom plate 19, which provides space for adding the liquid retaining component.

[0027] Please refer to Figure 3 , the bracket 2 includes a first frame body 14 and a second frame body 15 stacked up and down, and the liquid retaining 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. The split frame body structure can provide a larger liquid retaining chamber. By adopting the way of stacking the first frame body 14 and the second frame body 15, it not only plays a role in supporting the motor 1, provides space for the installation of the liquid retaining component, but also can be independently installed and disassembled, reducing the processing cost and facilitating installation and use. Specifically, the bracket 2 is detachably installed between the motor 1 and the installation base 6 and can be disassembled and assembled as needed. The second frame body 15 supports on the installation 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 cylindrical tube or a square tube, so that a liquid retaining chamber can be formed inside for arranging the liquid retaining component. The upper and lower surfaces of the first frame body 14 are machined in one clamping, with good concentricity. There are rabbets on both the upper and lower surfaces to concentrically install the motor 1 and the second frame body 15. In the way of the split bracket 2 this time, the bracket 2 can also be of an integral type. The bracket 2 extends into the liquid retaining chamber to form a box body for the rolling bearing 18, and the rolling bearing 18 is arranged in the box body, as Figure 4 shown.

[0028] Please refer to Figures 1 to 5 , the liquid retaining component can adopt one or more of the rolling bearing 18, the mechanical seal structure 5, and the shaft coupling expansion sleeve 3.

[0029] Please refer to Figures 1 to 5

[0030] Please refer to Figures 1 to 5 ​, the liquid retaining component includes a rolling bearing 18 provided on the impeller connecting shaft 4. The second frame body 15 extends into the liquid retaining chamber to form a support frame 17, and the support frame 17 is connected to the rolling bearing 18. Preferably, the support frame 17 and the housing of the rolling bearing 18 are of an integrally formed structure. In this 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 the axial force and the radial force simultaneously. The angular contact ball bearing or the deep groove ball bearing can be arranged in the housing. The housing can be an oil seal to prevent oil leakage and liquid from rising. This rolling bearing 18 can support the impeller connecting shaft 4, reduce friction and wear, and lower the noise. The housing can be manufactured in batches with the support frame 17 or integrally formed.

[0031] Please refer to Figures 1 to 5 , the liquid retaining component further includes a mechanical seal structure 5 provided on the impeller connecting shaft 4, and at least a part of the mechanical seal structure 5 is placed in the liquid retaining chamber. In this embodiment, the mechanical seal can adopt a cartridge seal to reduce the installation difficulty. The rising liquid in the seal cavity is blocked by an O-ring, and the seal is formed by the high-speed rotational friction of the seal surface to prevent the liquid leakage from polluting the environment.

[0032] Please refer to Figures 1 to 5 , this device further includes a coupling 16 for connecting the impeller connecting shaft 4 and the shaft of the motor 1, and the coupling 16 is located in the liquid retaining chamber. In this embodiment, the coupling 16 is used to connect the shaft of the motor 1 and the impeller connecting shaft 4, playing the role of transmitting torque and buffering and damping. This part helps to solve the problem that even if the mechanical seal structure 5 leaks, it can prevent the process medium and foam from leaking into the motor 1 and avoid the serious accident of burning out the motor 1.

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

[0034] Please refer to Figures 1 to 5, the device further includes a housing 7 disposed below the mounting base 6, and the defoaming impeller 8 is located in the housing 7. In this embodiment, the housing 7 is one of a cylindrical shape and a rectangular shape. Preferably, the bottom of the housing 7 has a suction section 12. A flow guiding box body 11 is provided between the suction section 12 and the housing 7. The suction section 12 is a bell mouth welded to the lower part of the suction pipe, and a cross rib is welded at the bottom to prevent it from deforming and improve the suction efficiency. The flow guiding box body 11 is a plate welded with multiple threaded structures. A circle of small columns is welded on the upper surface of the suction section 12, and the small columns are threadedly connected to the housing 7. Preferably, a wearing ring 10 is added between the suction pipe and the inner hole cavity of the impeller, which prevents wear, increases the seal of the impeller suction port 20, improves the suction force of the impeller, prevents internal circulation, and increases the efficiency of the impeller.

[0035] Please refer to Figures 1 to 5 , a sliding bearing 9 is further provided on the impeller connecting shaft 4, and the sliding bearing 9 is located between the defoaming impeller 8 and the second frame body 2. In this embodiment, the sliding bearing 9 is composed of a box body, a wear-resistant bushing, and a shaft sleeve. The functions of shock absorption and support are realized through the sliding friction between the bushing and the shaft sleeve to balance the radial force generated during operation. Preferably, the inside of the shaft sleeve is provided on the impeller connecting shaft 4, and spiral water grooves are provided on the outside of the shaft sleeve. The spiral water grooves can collect liquid to a certain extent and act as bearing flushing liquid, while reducing the amount of liquid leaking from the sealed liquid, saving energy.

[0036] Please refer to Figures 1 to 5 , the device further includes an impeller nut 13, and the impeller nut 13 fastens the defoaming impeller 8 to the impeller connecting shaft 4 to ensure its stable and reliable operation and avoid the problem of part detachment during installation and operation.

[0037] Please refer to Figure 5, a horizontally disposed bottom plate 19 is provided inside the housing 7. The bottom plate 19 has a suction port 20 for sucking in foamed 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, a groove 21 is provided on the bottom plate 19 for the bottom of the defoaming impeller 8 to extend into. An inhalation section 12 is formed at the bottom plate 19 of the housing 7, and a mouth ring 10 is provided on the inhalation section 12. In this embodiment, by providing the bottom plate 19 with the suction port 20 inside the housing 7, a certain sealing effect can be formed in cooperation with the defoaming impeller 8. The sealing effect enables the impeller to efficiently suck in foam. Additionally, a 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, extending 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. When the defoaming impeller 8 rotates at a high speed, a sealing effect can be formed to efficiently suck in foamed liquid. When it is difficult to achieve absolute smoothness or parallelism between the two, a groove 21 can be designed, which neither affects the sealing nor causes wear of the defoaming impeller 8 and the bottom plate 19 due to friction between them.

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

[0039] The installation base 7 of the defoaming device is installed on the top of the container according to the size matching the container. The motor 1 is firmly connected to the installation base 7 by means of a motor bracket 2. The motor 1 drives the defoaming impeller 8 to rotate through a coupling expansion sleeve 3, an impeller connecting shaft 4, a mechanical seal 5, and a sliding bearing 6. After the defoaming impeller 8 rotates, a suction force is formed. The foam generated on the surface of the container is sucked into the inlet of the defoaming impeller 8 through the inhalation section at the bottom of the housing 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, separate the gas and liquid. The liquid is thrown towards the side wall of the housing 9 by inertia. The liquid generated after defoaming flows along the housing 9 to the drain hole on the side wall, further dissipating the energy of the fluid after defoaming and dispersing it into the container, avoiding conflict with the foam flow, and at the same time guiding the liquid to flow downward, completely isolating the foam flow and liquid flow in the container from the motor 1. The defoaming impeller 8 and the bottom plate of the housing 9 form a seal in a certain shape, improving the inhalation efficiency of the defoaming impeller 8 and ensuring that while the impeller efficiently inhales, it will not cause wear of the impeller. For the foam flow or liquid flow caused by the positive pressure or negative pressure formed by the easily foaming medium in the container, even if the mechanical seal 5 is damaged, the foam flow or liquid flow will be intercepted by the coupling expansion sleeve 3 and will not damage the motor 1. A mouth ring 10 is added between the suction port pipeline and the inner hole cavity of the impeller, increasing the seal of the impeller suction port, reducing wear, improving the suction force of the impeller, preventing internal circulation, and increasing the efficiency of the impeller.

[0040] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended 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 an impeller connecting shaft of the defoaming impeller is coaxially connected to a motor shaft of the motor, and is characterized in that: It further includes a housing for accommodating the defoaming impeller. A horizontally arranged bottom plate is provided inside the housing. The bottom plate has a suction port for sucking foam liquid. The defoaming impeller contacts the bottom plate, and the working area formed by the rotation of the defoaming impeller covers the suction port.

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

3. A physical defoaming device as described in claim 1, characterized in that: An inhalation section is formed at the bottom plate of the housing, and a gland is provided on the inhalation section.

4. A physical defoaming device according to claim 1, characterized in that: It further includes a liquid blocking assembly for blocking liquid from entering the motor, and the liquid blocking assembly is arranged on the impeller connecting shaft.

5. The physical defoaming device according to claim 4, characterized in that: It further includes a bracket for supporting the motor, and the bracket has a liquid blocking chamber for arranging the liquid blocking assembly.

6. The physical defoaming device according to claim 5, wherein: The bracket includes a first frame body and a second frame body stacked up and down, and the liquid blocking chamber is formed between the first frame body and the second frame body.

7. The physical defoaming device according to claim 4, characterized in that: The liquid blocking assembly includes a shaft sleeve expansion sleeve arranged on the impeller connecting shaft, and the shaft sleeve expansion sleeve is arranged close to the motor.

8. A physical defoaming device according to claim 5, characterized in that: The liquid blocking assembly further includes a mechanical seal structure arranged on the impeller connecting shaft, and at least part of the mechanical seal structure is placed inside the bracket.

9. The physical defoaming device according to claim 1, characterized in that: It further includes a sliding bearing with a shaft sleeve. The inside of the shaft sleeve is arranged on the impeller connecting shaft, and spiral water grooves are provided on the outside of the shaft sleeve.

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

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