Defoaming mechanism and defoaming device

Abstract

The present application relates to defoaming technical field, provide a kind of defoaming mechanism, including defoaming impeller group, also including the defoaming impeller group of arrangement defoaming chamber and the expandable suction flow channel that can be absorbed into the defoaming chamber into foam, the expandable suction flow channel has the body that can be extended into the container to be defoamed, hollow chamber is equipped in the body, and several through holes for foam to enter the hollow chamber are opened on the body, and the defoaming chamber is communicated with the hollow chamber.It also provides a kind of defoaming device, including motor protection structure and above-mentioned defoaming mechanism.The present application uses expandable suction flow channel, can avoid directly overflowing due to the size of container, far from defoaming device foam;Multi-layer impeller structure is used, and impeller can use the combination form of sectorial impeller and multi-wing centrifugal impeller, while increasing the suction pressure difference and processing capacity of foam, high-efficiency foam is broken.

Description

Technical Field

[0001] This invention relates to the field of defoaming technology, specifically to a defoaming mechanism and a defoaming device. Background Technology

[0002] In industries such as steel, chemicals, pharmaceuticals, and food, the chemical media used in production often generate foam that is detrimental to production. If this foam is not treated promptly and effectively, it can harm production processes and equipment, damage equipment, affect product quality, and even reduce production capacity. For example, in the processing of steel strip, a degreasing section is required to clean the surface of rolled steel strips containing grease, scale powder, iron powder, carbon powder, and other contaminants. Because the degreasing agent contains surfactants, under the influence of agitation and temperature, it can trap air and generate a large amount of foam. This foam overflowing from the container can damage surrounding motors and cause environmental pollution. Foam overflowing into the steel strip cleaning tank can also affect the cleaning effect.

[0003] Currently, most defoaming methods employ chemical defoaming by adding defoamers to easily foaming media. Patents ZL200820218185.3 and ZL200820012731.8 disclose defoaming methods and equipment using defoamers. However, the defoamers used in this chemical defoaming method generally inhibit the active ingredients in the easily foaming media, and some may even produce precipitates that clog system pipes and equipment. Defoamers need to be added continuously according to the condition of the easily foaming media, consuming significant production costs. Furthermore, defoamers themselves generally contain recalcitrant organic compounds such as organosilicon or polyethers, increasing the difficulty and cost of water treatment. If ordinary mechanical defoaming methods are used, the container storing the easily foaming media will experience pressure changes due to the media itself, and the significant upward airflow formed after foam breakage will carry unbroken foam across the impeller. This can damage the motor and other mechanisms of the mechanical defoaming device, or even overflow directly outside the container, causing harm. Summary of the Invention

[0004] The purpose of this invention is to provide a defoaming mechanism and a defoaming device, which can at least solve some of the defects in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a defoaming mechanism, including a defoaming impeller assembly, a defoaming chamber for housing the defoaming impeller assembly, and an expandable suction flow channel for drawing foam into the defoaming chamber. The expandable suction flow channel has a body that can extend into a container to be defoamed. The body has a hollow cavity and several through holes for foam to enter the hollow cavity. The defoaming chamber is connected to the hollow cavity.

[0006] Furthermore, the through hole is circular and / or polygonal in shape.

[0007] Furthermore, the defoaming impeller assembly includes one or more combined impellers.

[0008] Furthermore, the impeller is a multi-bladed centrifugal impeller, a fan-shaped impeller, a plate-type welded impeller, or a cast impeller.

[0009] Furthermore, the impeller is provided with a needle-like structure.

[0010] Furthermore, it also includes a secondary defoaming box, in which the defoaming chamber is placed, and the inner wall of the secondary defoaming box is provided with a needle-like structure.

[0011] Furthermore, it also includes a flow guide box for diverting and dissipating the liquid after the foam is broken, the flow guide box being connected to the defoaming chamber.

[0012] Furthermore, it also includes an exhaust port for releasing gas after the foam is broken, the exhaust port being connected to the defoaming chamber.

[0013] Furthermore, an inlet ring is provided between the inlet pipe and the impeller inner cavity.

[0014] This invention provides another technical solution: a defoaming device, including a motor protection structure and the aforementioned defoaming mechanism.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. Through the cooperation of the first sealing component and the second sealing component, the motor can be protected in all aspects. Even if the first sealing component is damaged and cannot play a good blocking role, the second sealing component can still provide protection, ensuring that no fluid enters and causes damage to the motor.

[0017] 2. The use of beveled outer and inner fastening rings ensures that the greater the expansion, the greater the fastening force, thus ensuring that the impeller shaft is firmly secured to the motor shaft.

[0018] 3. The motor shaft and impeller shaft adopt a socket structure, which can ensure their concentricity.

[0019] 4. An expandable suction flow channel is adopted, which can prevent foam that is far from the defoaming device from overflowing due to container size.

[0020] 5. It adopts a multi-layer impeller structure. The impeller can be a combination of fan-shaped impeller and multi-blade centrifugal impeller, which can increase the pressure difference for foam suction and processing capacity while efficiently breaking up foam. Attached Figure Description

[0021] Figure 1 A front view of a defoaming device provided in an embodiment of the present invention;

[0022] Figure 2 A top view of a defoaming device provided in an embodiment of the present invention;

[0023] Figure 3 An enlarged schematic diagram of a second sealing assembly for a defoaming device provided in an embodiment of the present invention;

[0024] In the attached figures, the following are the reference numerals: 1-Defoaming mechanism; 10-Impeller shaft; 11-Motor; 110-Motor shaft; 111-Base; 12-Defoaming impeller assembly; 13-Defoaming chamber; 14-Expandable suction flow channel; 140-Through hole; 15-Secondary defoaming box; 150-Needle-shaped structure; 160-Guide box body; 17-Exhaust port; 18-Inlet ring; 19-Mounting base; 2-Motor protection structure; 20-First sealing assembly; 21-Second sealing assembly; 210-Blocking surface; 211-Inner fastening ring; 212-Outer fastening ring; 213-Fasting bolt; 22-Motor bracket; 23-Bearing device. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1 , Figure 2 and Figure 3This invention provides a motor protection structure for a defoaming device, including a first sealing component 20 and a second sealing component 21, both of which can be mounted on an impeller shaft 10. The first sealing component 20 and the second sealing component 21 are spaced apart, with the second sealing component 21 positioned close to the base 111 of the motor 11. The first sealing component 20 blocks fluid from the defoaming mechanism 1 of the defoaming device, and the second sealing component 21 prevents fluid that has bypassed the first sealing component 20 from entering the motor 11. The size of the blocking surface 210 of the second sealing component 21 is larger than the size of the hole on the base 111 of the motor 11 through which the drive shaft extends. In this embodiment, the cooperation of the first sealing component 20 and the second sealing component 21 provides comprehensive protection for the motor 11. Even if the first sealing component 20 is damaged and cannot provide adequate blocking, the second sealing component 21 can still provide protection, ensuring that fluid entering the motor 11 will not cause damage. Specifically, during defoaming, fluid splashes from the defoaming mechanism 1. The first sealing component 20 can block the fluid, and if the first sealing component 20 fails to block the fluid, the second sealing component 21 can also block the fluid. This double protection ensures the safety of the motor 11. Preferably, the fluid can be a foam flow, a liquid flow, or a gas flow, caused by the positive or negative pressure formed by the foaming medium inside the container.

[0027] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3The first sealing assembly 20 includes a mechanical seal mechanism, a packing seal mechanism, a labyrinth seal mechanism, a spiral seal mechanism, a dry gas seal mechanism, or an oil seal mechanism. In this embodiment, the first sealing assembly 20 can adopt one of the following: mechanical seal, packing seal, labyrinth seal, spiral seal, dry gas seal, or oil seal. These sealing forms are all existing sealing methods. For example, a mechanical seal is used for dynamic sealing of rotating parts. By cooperating with an appropriate flushing scheme, it can achieve trace or zero leakage of the medium. It is a device that prevents fluid leakage by having at least a pair of end faces perpendicular to the axis of rotation kept in contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, as well as the cooperation of auxiliary seals. This device can be installed on the impeller shaft. Another example is a packing seal mechanism, which is a dynamic sealing device that generates a clamping force between the packing and the rotating and fixed parts through pre-tightening or self-tightening action of the medium pressure. It mainly consists of packing, a packing box, and a packing fixing part. The packing box can be installed on the impeller shaft. For example, the labyrinth seal mechanism uses a set of sealing teeth to form a series of regularly spaced throttling gaps and expansion cavities between the sealing cavity and the rotating shaft. When gas flows through the gap formed by the sealing teeth and the shaft surface, the airflow is throttled, resulting in a decrease in pressure and temperature and an increase in velocity. After passing through the gap, there is a larger cavity formed by the two sealing teeth, thus achieving a sealing effect. Another example is the spiral seal mechanism, as described in the invention patent application CN03266296.3. This mechanism uses multi-line spiral grooves arranged in opposite directions on the opposing surfaces of the moving and stationary rings to form a series of straight-line booster blades. An additional flow, consistent with the flow from the pump inlet to the outlet, is formed along the spiral grooves. Optimized design ensures that this additional flow matches the backflow rate of the gap between the two rings, achieving a seal. Finally, the dry gas seal mechanism is a novel shaft end seal that applies slotted sealing technology to gas sealing, belonging to the category of non-contact seals. Finally, the oil seal mechanism is a self-tightening lip seal. It has a simple structure, small size, low cost, convenient maintenance, and low torque resistance. It can prevent media leakage and also prevent external dust and other harmful substances from entering. It relies on the centrifugal principle to extract liquid materials to achieve sealing.

[0028] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3The second sealing assembly 21 includes a blocking ring unit that can be fitted onto the impeller shaft 10 and a locking unit that locks the blocking ring assembly onto the impeller shaft 10. The size of the blocking surface 210 formed by the combined structure of the locking unit and the blocking ring unit is larger than the size of the hole. In this embodiment, the second sealing assembly 21 is further refined. It consists of a blocking ring unit and a locking unit. The blocking ring is ring-shaped and can block the hole in the base 111. The locking unit can securely lock the blocking ring unit onto the impeller shaft 10, and at the same time, it can also firmly secure the impeller shaft 10 to the motor shaft 110. Preferably, a bearing device 23 is used to avoid vibration after the impeller shaft 10 reaches a certain length. The bearing device 23 bears the centrifugal force, making the centrifugal device operate more reliably and smoothly.

[0029] For further optimization of the above solution, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 3 The blocking ring unit includes an inner fastening ring 211 and an outer fastening ring 212. The inner fastening ring 211 is sleeved on the impeller shaft 10, and the outer fastening ring 212 is pressed against the inner fastening ring 211. The surfaces of the outer fastening ring 212 and the inner fastening ring 211 that are pressed together are mutually cooperating inclined surfaces. The locking unit fixes the outer fastening ring 212 to the base 111 of the motor 11. In this embodiment, the blocking ring unit is further refined. It consists of an inner fastening ring 211 and an outer fastening ring, which are locked by the locking unit through inclined surfaces. The inclined surfaces of the two are in contact with each other, and the radius of the inclined surface circle is smaller at the top and larger at the bottom. This ensures that the more it expands, the greater the fastening force.

[0030] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3 The locking unit includes a fastening bolt 213, which fixes the outer fastening ring 212 to the base 111 of the motor 11. In this embodiment, the fastening bolt 213 is used for easy disassembly and replacement. Of course, other existing fastening methods besides bolts are also feasible, and this embodiment does not limit them.

[0031] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3The structure also includes a motor bracket 22 for mounting the motor 11, the motor bracket 22 having space for accommodating the first sealing component 20. In this embodiment, the motor bracket 22 facilitates the installation and fixation of the motor 11 while also providing space for the first sealing component 20. Preferably, the motor bracket 22 has a stop that allows for concentric mounting with the motor 11. The upper and lower surfaces are machined in a single clamping operation, ensuring good concentricity. Furthermore, the motor bracket 22 has stops on both the upper and lower surfaces, allowing the motor 11 and the base plate to be mounted concentrically with it, respectively. Preferably, the motor 11 can be either a power frequency motor 11 or a variable frequency motor 11.

[0032] Please see Figure 1 , Figure 2 and Figure 3 This invention provides a defoaming mechanism 1, including a defoaming impeller assembly 12, a defoaming chamber 13 for housing the defoaming impeller assembly 12, and an expandable suction flow channel 14 for drawing foam into the defoaming chamber 13. The expandable suction flow channel 14 has a body that can extend into a container to be defoamed. The body has a hollow cavity and several through holes 140 for foam to enter the hollow cavity. The defoaming chamber 13 communicates with the hollow cavity. In this embodiment, the expandable suction flow channel 14 is used to prevent foam that is far from the defoaming device from overflowing due to the size of the container. Specifically, the expandable suction flow channel 14 can be designed to expand according to the shape of the container to be defoamed, and it has many through holes 140 to facilitate the entry of foam into its hollow cavity, and then from the hollow cavity into the defoaming chamber 13 for defoaming. The entire system uses suction to draw the foam in the container into the expandable suction flow channel 14. Preferably, the single flow channel has a porous, cylindrical, or cuboid structure. Multiple sets of single flow channels can be arranged in a frame, circular, or strip-divergent form according to the shape of the container. That is, the main body has a frame-shaped, columnar, or strip-divergent structure. The strip-divergent structure includes several suction tubes, one end of each suction tube converging to form a convergence part, and the other end of each suction tube diverging outward from the convergence part. The through holes are provided on each suction tube. Simply put, this strip-divergent structure is similar to a claw. After being inserted into the container, its multiple claws can all have the ability to absorb foam. Each suction tube can be arranged in a circular direction on the xy-axis plane, or it can have a certain angle in the z-axis direction. The extended suction flow channel can evenly distribute the suction capacity of the defoaming device to the surface or key areas of the container where foam is generated, according to the shape of the container.

[0033] As an optimized solution for an embodiment of the present invention, please refer to 1 and Figure 2The defoaming impeller assembly 12 includes one or more combined impellers. Preferably, the impeller is a multi-blade centrifugal impeller, a fan-shaped impeller, a plate-welded impeller, or a cast impeller. The impeller has needle-like structures. In this embodiment, the needle-like structures on the impeller surface increase the foam extraction capacity while also eliminating a portion of the foam. The impeller can be made of cast iron, carbon steel, stainless steel, titanium and titanium alloys, tantalum and tantalum alloys, or other metals and alloys, or materials such as PPH, PVDF, fiberglass, and steel-lined plastic.

[0034] As an optimized solution for an embodiment of the present invention, please refer to 1 and Figure 2 The device also includes a secondary defoaming chamber 15, in which the defoaming chamber 13 is placed. The inner wall of the secondary defoaming chamber 15 is provided with needle-like structures 150. In this embodiment, the fine needle-like structures on the inner surface of the chamber can eliminate some of the unbroken foam thrown out by the impeller and dissipate the energy of the defoamed liquid flow, reducing the probability of secondary foam generation.

[0035] As an optimized solution for an embodiment of the present invention, please refer to 1 and Figure 2 The device also includes a flow guide box 160 for guiding and dissipating the liquid after the foam is broken, and the flow guide box 160 is connected to the defoaming chamber 13. In this embodiment, the flow guide box 160 is a plate-welded multi-hole structure, which guides and dissipates the liquid flowing down after the foam is completely broken, and finally disperses it into the container.

[0036] As an optimized solution for an embodiment of the present invention, please refer to 1 and Figure 2 The device also includes an exhaust port 17 for releasing gas after foam breakage, and the exhaust port 17 is connected to the defoaming chamber 13. In this embodiment, the exhaust port 17 is an opening provided on the mounting base 19, which can release gas after foam breakage. An air extraction pipeline system can also be provided here to form a certain negative pressure in the defoaming area, which increases the foam size, thins the liquid film, and makes the foam easier to break.

[0037] As an optimized solution for an embodiment of the present invention, please refer to 1 and Figure 2 A mouth ring 18 is provided between the suction inlet pipe and the inner cavity of the impeller. In this embodiment, the addition of a mouth ring 18 between the suction inlet pipe and the inner cavity of the impeller increases the sealing of the impeller suction inlet, improves the suction force of the impeller, prevents internal circulation, and increases the efficiency of the impeller.

[0038] Please see Figure 1 , Figure 2 and Figure 3This invention provides a defoaming device, including a defoaming mechanism 1 and the aforementioned motor protection structure 2 for the defoaming device. The first sealing component 20 is disposed close to the defoaming mechanism 1. In this embodiment, the aforementioned motor protection structure 2 is used in the defoaming device to protect the motor 11 of the defoaming device from damage. The defoaming device as a whole includes three main parts: the motor 11, the motor protection structure 2, and the defoaming mechanism 1. The motor 11 provides power, the motor protection structure 2 protects the motor 11, and the defoaming mechanism 1 works to defoam.

[0039] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3 The defoaming mechanism 1 includes a defoaming impeller assembly 12 and an impeller shaft 10 for mounting the defoaming impeller assembly 12. The impeller shaft 10 and the motor shaft 110 of the motor 11 are coaxially arranged. Preferably, the impeller shaft 10 has a mounting hole for the motor shaft 110 to be inserted. In this embodiment, the motor shaft 110 and the impeller shaft 10 are connected by a socket structure to ensure their concentricity. Preferably, the impeller shaft 10 is clamped and machined in one operation. This successfully solves the problem of reliable connection between the motor 11 and the impeller, ensuring good concentricity and reliable and stable operation of the device.

[0040] As an optimized solution for an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 3 The device also includes a mounting base 19, which is located on the secondary defoaming box 15 and serves as a support for the motor 11. The mounting base 19 can be one of a round flange, a square flange, or a base made of a steel frame.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A defoaming device, characterized by: The motor protection structure and the defoaming mechanism, the defoaming mechanism comprising a defoaming impeller group, a defoaming chamber for the defoaming impeller group to be arranged in, and an expandable suction flow channel capable of sucking the foam into the defoaming chamber, the expandable suction flow channel having a body capable of extending into the container to be defoamed, a hollow chamber being arranged in the body, and a plurality of through holes being arranged on the body for the foam to enter the hollow chamber, the defoaming chamber being in communication with the hollow chamber, the expandable suction flow channel being in a strip divergent structure, the strip divergent structure comprising a plurality of strip-shaped suction pipes, one end of each of the strip-shaped suction pipes being gathered together to form a converging portion, and the other end of each of the strip-shaped suction pipes diverging outwardly with the converging portion as the center, the through holes being arranged on each of the strip-shaped suction pipes, the motor protection structure comprising a first sealing assembly and a second sealing assembly, both of which are capable of being mounted on the impeller shaft, the first sealing assembly and the second sealing assembly being arranged at intervals, and the second sealing assembly being arranged close to the base of the motor; the first sealing assembly comprising a mechanical sealing mechanism, a packing sealing mechanism, a labyrinth sealing mechanism, a spiral sealing mechanism, a dry gas sealing mechanism or an oil seal sealing mechanism; the second sealing assembly comprising a blocking ring unit capable of being sleeved on the impeller shaft and a locking unit capable of locking the blocking ring unit on the impeller shaft, the locking unit firmly locking the blocking ring unit on the impeller shaft, and the locking unit fastening the impeller shaft on the motor shaft, the blocking ring unit comprising an inner fastening ring and an outer fastening ring, the inner fastening ring being sleeved on the impeller shaft, the outer fastening ring being press-fitted on the inner fastening ring, and the press-fitted surfaces of the outer fastening ring and the inner fastening ring being mutually matched inclined surfaces, the locking unit fixing the outer fastening ring on the base of the motor, the base of the motor having a hole for the driving shaft to extend out, and the blocking surface formed by the combined structure of the locking unit and the blocking ring unit being larger than the hole.

2. The defoaming device of claim 1, wherein: The shape of the through holes is circular and / or polygonal.

3. The defoaming device of claim 1, wherein: The defoaming impeller group comprises one or more combined impellers.

4. The defoaming device of claim 3, wherein: The impeller is a multi-wing centrifugal impeller, a fan-shaped impeller, a plate-type welded impeller or a cast impeller.

5. The defoaming device of claim 3, wherein: The impeller is provided with needle-shaped structures.

6. The device of claim 1, wherein: A secondary defoaming box is further included, the defoaming chamber being arranged in the secondary defoaming box, and the inner wall of the secondary defoaming box being provided with needle-shaped structures.

7. The device of claim 1, wherein: A flow guide box body is further included for guiding and dissipating the liquid after the foam is broken, the flow guide box body being in communication with the defoaming chamber.

8. The defoaming device of claim 1, wherein: An exhaust port is further included for releasing the gas after the foam is broken, the exhaust port being in communication with the defoaming chamber.

9. The device of claim 1, wherein: An orifice ring is arranged between the suction inlet pipe and the inner hole cavity of the impeller.

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