Self-locking green high-pressure-resistant physical defoaming device

Abstract

The utility model relates to defoaming technical field provides a kind of self-locking green high-pressure-resistant physical defoaming device, including the defoaming impeller for eliminating foam and the motor for driving the defoaming impeller rotation, the impeller connecting shaft of the defoaming impeller is coaxially connected with the motor shaft of motor, the defoaming impeller includes impeller hub, the threaded hole of being equipped with with the impeller connecting shaft screw connection on the impeller hub, and the keyway is also equipped on the impeller hub, the transmission key is equipped on the impeller connecting shaft, the transmission key is connected with the keyway key connection. A kind of self-locking green high-pressure-resistant physical defoaming device of the utility model, by being equipped with internal thread in the hub inside defoaming impeller, can form precision engagement with impeller connecting shaft, cooperate keyway transmission main torque, ensure that impeller reliable connection, also facilitate disassembly and maintenance, prevent wear between shaft hub.

Description

Technical Field

[0001] This utility model relates to the field of defoaming technology, specifically a self-locking, green, high-pressure resistant physical 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 pipelines and equipment. Continuously adding defoamers according to the condition of the easily foaming media consumes significant production costs, and the defoamers themselves generally contain recalcitrant organic compounds such as organosilicon or polyethers, increasing the difficulty and cost of water treatment. Furthermore, 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 cause direct overflow outside the container, resulting in harm. Utility Model Content

[0004] The purpose of this invention is to provide a self-locking, green, high-pressure resistant physical defoaming device, which can at least solve some of the defects in the existing technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a self-locking, green, high-pressure resistant 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, the defoaming impeller includes an impeller hub, the impeller hub is provided with a threaded hole that is threadedly connected to the impeller connecting shaft, and the impeller hub is also provided with a keyway, the impeller connecting shaft is provided with a transmission key, and the transmission key is connected to the keyway key.

[0006] Furthermore, there are multiple keyways and one-to-one connections between them.

[0007] Furthermore, it also includes an impeller nut for mounting the defoaming impeller on the impeller connecting shaft.

[0008] Furthermore, the impeller nut is located at the end of the impeller connecting shaft away from the motor.

[0009] Furthermore, it also includes a motor bracket for supporting the motor, a mounting base for supporting the motor bracket, and a housing located below the mounting base, wherein the defoaming impeller is located in the housing.

[0010] Furthermore, the bottom of the housing has an intake section.

[0011] Furthermore, the inhalation section is provided with a mouth ring.

[0012] Furthermore, a cross-shaped rib is welded to the bottom of the suction section.

[0013] Furthermore, a flow guide box is provided between the inhalation section and the housing.

[0014] Furthermore, the flow guide box is detachably connected to the suction section.

[0015] Compared with the prior art, the beneficial effects of this utility model are: a self-locking green high-pressure resistant physical defoaming device, by providing an internal thread inside the hub of the defoaming impeller, can form a precise mesh with the impeller connecting shaft, and with the keyway to transmit the main torque, ensuring reliable connection of the impeller, while also facilitating disassembly and maintenance, and preventing wear between the shaft and hub. Attached Figure Description

[0016] Figure 1 A vertical cross-sectional view of an integrated green high-pressure resistant physical defoaming device provided in Embodiment 1 of this utility model;

[0017] Figure 2 A vertical cross-sectional view of a green, high-pressure resistant physical defoaming device with adjustable gap provided in Embodiment 2 of this utility model;

[0018] Figure 3 This is a vertical cross-sectional structural diagram of a self-locking, green, high-pressure resistant physical defoaming device provided in Embodiment 3 of this utility model;

[0019] Figure 4 This is a vertical cross-sectional structural diagram of a self-sealing, high-pressure resistant physical defoaming device provided in Embodiment 4 of this utility model. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0021] Please see Figures 1 to 4 This utility model provides a defoaming device, including a defoaming impeller for eliminating foam, a motor for driving the defoaming impeller to rotate, a mounting plate for supporting the motor, and a housing located below the mounting plate. The defoaming impeller is located in the housing, and the impeller connecting shaft of the defoaming impeller is coaxially connected to the motor shaft of the motor. The following embodiments detail four defoaming devices: an integrated green high-pressure resistant physical defoaming device, a gap-adjustable green high-pressure resistant physical defoaming device, a self-locking green high-pressure resistant physical defoaming device, and a self-sealing high-pressure resistant physical defoaming device. In these four embodiments, different detailed structural improvements have been made to the defoaming device. For example, the integrated green high-pressure resistant physical defoaming device improves sealing and stress stability; the gap-adjustable green high-pressure resistant physical defoaming device improves the flow guide box; the self-locking green high-pressure resistant physical defoaming device improves the defoaming impeller; and the self-sealing high-pressure resistant physical defoaming device improves the sealing scheme. These four improvements are interchangeable and can be assembled according to actual product needs.

[0022] The following are specific examples:

[0023] Example 1:

[0024] Please see Figure 1 This utility model provides an integrated green high-pressure resistant physical defoaming device, including a motor 1, a packing seal 2, a mounting plate 3, an angular contact ball bearing 4, a bearing housing 5, an impeller connecting shaft 6, a housing 7, a defoaming impeller 8, an impeller nut 9, a mouth ring 10, a suction section 11, a pressure cap 12, and a cylindrical roller bearing 13.

[0025] Specifically, the defoaming device includes a defoaming impeller 8 for eliminating foam and a motor 1 for driving the defoaming impeller 8 to rotate. The impeller connecting shaft 6 of the defoaming impeller 8 is coaxially connected to the motor shaft of the motor 1. In addition, the defoaming device also includes a bearing housing 5 for mounting the impeller connecting shaft 6. The bearing housing 5 is provided with a sealing structure for shaft sealing and a bearing assembly structure for bearing load. In this embodiment, by setting a sealing structure in the designed bearing housing 5, damage to the motor caused by foam flow or liquid flow due to positive or negative pressure formed by the easily foaming medium in the container can be avoided. At the same time, the three-bearing assembly structure can stably bear the force, forming a high-rigidity support system that resists compound loads, ensuring the smooth and reliable operation of the impeller connecting shaft 6.

[0026] Please see Figure 1 The bearing assembly structure includes angular contact ball bearings 4 and cylindrical roller bearings 13, which are spaced apart on the impeller connecting shaft 6. Each angular contact ball bearing 4 has two discs, arranged back-to-back. The sealing structure includes a packing seal 2, which is located inside the bearing housing 5. There are two packing seals 2, located at the upper and lower ends of the bearing housing 5, respectively. The packing seal 2 is fitted onto the impeller connecting shaft 6 via a sealing sleeve. In this embodiment, the bearing assembly uses angular contact ball bearings 3 and cylindrical roller bearings 13, both existing bearings. However, their combined use can simultaneously withstand bidirectional axial and radial forces, forming a high-rigidity, composite-load-resistant support system to ensure the smooth and reliable operation of the impeller connecting shaft 6. The packing seal 2 is also an existing seal, but it is located at the upper and lower ends of the bearing assembly structure, which can form a double packing seal system. Then, by applying radial pressure through the gland 12, bidirectional isolation between the foam medium and the bearing cavity can be achieved, completely isolating the foam flow and liquid flow in the container from the motor 1. The foam flow or liquid flow caused by the positive or negative pressure formed by the easily foaming medium in the container will not damage the motor 1.

[0027] Please see Figure 1 The defoaming device also includes a pressure cap 12 located at the bottom of the bearing housing, which abuts against the sealing structure. The pressure cap 12 abuts against the lower packing seal 2, and a space for the pressure cap to be installed can also be designed in the upper part of the bearing housing for the packing seal 2, thereby forming a radial pressing force on the upper packing seal.

[0028] Please see Figure 1Mounting plate 4 is installed on top of the container according to the dimensions matching the container. Motor 1 is directly and rigidly fixed to mounting plate 3. Motor 1 drives defoaming impeller 8 to rotate through packing seal 2, angular contact ball bearing 4, cylindrical roller bearing 13, and impeller connecting shaft 6. After rotation, defoaming impeller 8 generates suction force, which draws the foam generated on the container surface into the inlet of defoaming impeller 8 through suction section 11, which is set along the shape of the container. Defoaming impeller 8 uses the shear force and compression effect generated by the impeller to break the bubbles, separating gas and liquid. The liquid is thrown towards the shell 7 by inertial force. The liquid generated after defoaming is dispersed into the container through the drain hole of suction section 11 along the shell 7, avoiding conflict with the foam flow. Impeller nut 9 is installed at the end of impeller connecting shaft 6 at the bottom of the impeller to fasten the impeller and transmit torque, improving vibration resistance and anti-loosening performance. A mouth ring 10 is added between the suction inlet pipe and the inner cavity of the impeller to increase the sealing of the impeller suction inlet, reduce wear, improve the suction force of impeller 8, prevent internal circulation, and increase the efficiency of impeller 8.

[0029] Please see Figure 1The defoaming device also includes a mounting plate 3 for supporting the motor and a housing located below the mounting plate, with the defoaming impeller situated within the housing. The bottom of the housing has a suction section. A suction ring is provided on the suction section. In this embodiment, the motor 1 can be either a power frequency motor or a variable frequency motor, either explosion-proof or non-explosion-proof, and either high-efficiency or ordinary type. Two packing seals 2 are located above the angular contact ball bearing 4 and below the cylindrical roller bearing 13, respectively, to prevent foam from intruding into the bearings and to block liquid from seeping into the external environment. Axial clamping force causes radial expansion of the packing to achieve sealing, while simultaneously cooperating with a sealing bushing to prevent wear on the impeller connecting shaft. The mounting plate 3 can be a circular flange, a square flange, or a steel frame. Two angular contact ball bearings mounted back-to-back at the upper end have adjustable preload and bear axial bidirectional loads, while a cylindrical roller bearing at the lower end bears the radial centrifugal force of the impeller. The bearing housing 5 has an internal sealed cavity and a bearing mounting cavity. Together with the pressure cap, it isolates the bearing and seal from the external environment, forming a sealed space that simultaneously supports the stable and reliable operation of both the bearing and the seal. The impeller connecting shaft 6 is assembled and machined in a single process. This successfully solves the problem of reliable connection between the motor and the impeller, ensuring good concentricity and stable, reliable operation of the device. The impeller connecting shaft 6 can also be customized in length according to the site conditions, currently reaching a maximum of two meters. The housing 7 is cylindrical or rectangular in shape. The defoaming impeller 8 can be one or more combined impellers, which can be axial flow or fan-shaped. Furthermore, the impeller can be a welded plate impeller or a cast impeller. The impeller nut 9 has a wrench structure on its outer circumference, which tightens the impeller while transmitting torque. Combined with a shim, it increases the friction surface and improves vibration resistance and anti-loosening performance. A mouth ring 10 is added between the suction inlet pipe and the impeller inner cavity to prevent wear, increase the seal of the impeller suction inlet, improve the impeller's suction force, prevent internal circulation, and increase impeller efficiency. The suction section 11 has a flared opening welded below the suction pipe and cross-shaped ribs welded to the bottom to prevent deformation and improve suction efficiency. A ring of drain holes is also provided at the horizontal plate to prevent liquid accumulation inside the casing.

[0030] Thus, this defoaming device effectively isolates the foam impact flow caused by positive or negative pressure in the container containing chemical media, preventing damage to the motor and pollution of the working environment. Simultaneously, the direct connection of the motor to the mounting plate results in a compact structure, reduced vibration, stable and reliable operation, reduced noise, and ease of installation and use.

[0031] Example 2:

[0032] Please see Figure 2This utility model provides a green, high-pressure resistant physical defoaming device with adjustable gap, including a motor 1, a motor bracket 2, a shaft expansion sleeve 3, an impeller connecting shaft 4, a mechanical seal 5, a sliding bearing 6, a mounting base 7, a defoaming impeller 8, a housing 9, a mouth ring 10, a flow guide box 11, a suction section 12, an impeller nut 13, and an adjusting bolt 14.

[0033] Specifically, the defoaming device includes a defoaming impeller 8 for eliminating foam, a motor 1 for driving the defoaming impeller 8 to rotate, a motor bracket 2 for supporting the motor 1, a mounting base 7 for supporting the motor bracket 2, and a housing 9 located below the mounting base 7. The defoaming impeller 8 is located within the housing 9, and the impeller connecting shaft 4 of the defoaming impeller is coaxially connected to the motor shaft of the motor 1. The bottom of the housing 9 has a suction section 12, and a flow guide box 11 is provided between the suction section 12 and the housing 9. The distance between the suction section 12 and the flow guide box 11 is adjustable. In this embodiment, by designing an adjustable distance between the suction section and the flow guide box, the mouth ring gap can be continuously adjusted within a certain range to adapt to different foam characteristics under different working conditions, ensuring suction efficiency while avoiding mouth ring wear, and facilitating installation and maintenance.

[0034] Please see Figure 2 The flow guide box 11 has an adjusting bolt 14. One end of the adjusting bolt 14 is mounted on the suction section 12, and the other end is mounted on the housing 9. At least one of the connections between the adjusting bolt 14 and the suction section 12, and between the adjusting bolt 14 and the housing 9, is a threaded connection. In this embodiment, one type of adjustable spacing is achieved by adjusting the thread of the adjusting bolt 14. Preferably, the tail end of the adjusting bolt 14 passes through the suction section and sequentially through the flow guide box 11 and the housing 9, while the head end of the adjusting bolt 14 abuts against the side of the suction section 12 away from the housing 9.

[0035] Another adjustment method involves providing a protruding post on the side of the suction section 12 facing the flow guide box 11. The protruding post has threads, and the flow guide box 11 has a threaded hole. The protruding post is threaded into the threaded hole. During adjustment, the distance between the suction section and the flow guide box 11 is adjusted by rotating the suction section 12.

[0036] Please see Figure 2This defoaming device also includes a sealing structure for sealing the impeller connecting shaft. The sealing structure includes a shaft expansion sleeve, a mechanical seal, and a sliding bearing arranged sequentially along the length of the impeller connecting shaft. The shaft expansion sleeve is positioned close to the motor. In this embodiment, the seal is achieved through the cooperation of the shaft expansion sleeve 3, the mechanical seal 5, and the sliding bearing 6. The shaft expansion sleeve 3 is secured with bolts to tighten the inclined surface, ultimately ensuring that the impeller connecting shaft 4 firmly secures the motor shaft. This helps prevent serious accidents such as motor burnout caused by leakage of the mechanical seal 5, which could prevent process media and foam from leaking into the motor. The mechanical seal 5 uses a single-end face seal, with a stationary ring mounted on top. An O-ring blocks rising liquid within the sealing cavity, and the seal is formed through high-speed rotational friction of the sealing surface, preventing liquid leakage and environmental pollution. The sliding bearing 6 consists of three parts: housing, wear-resistant bushing, and bushing. It achieves shock absorption and support through the sliding friction between the bushing and the bushing, balancing the radial force generated during operation. The bushing is internally connected to the 4-impeller connecting shaft by threads, making the connection more robust and reliable. The external spiral water groove reduces the leakage of sealing liquid.

[0037] Please see Figure 2The defoaming device also includes an impeller nut for mounting the defoaming impeller on the impeller connecting shaft. The impeller nut is located at the end of the impeller connecting shaft away from the motor. A mouth ring is provided on the suction section. A cross-shaped rib is welded to the bottom of the suction section. In this embodiment, the mounting base 7 is mounted on top of the container according to a size matching the container, and the motor 1 is securely connected to the mounting base 7 using a motor bracket 2. Motor 1 drives defoaming impeller 8 to rotate via impeller connecting shaft 4, shaft expansion sleeve 3, mechanical seal 5, and sliding bearing 6. The rotation of defoaming impeller 8 creates suction force, drawing foam generated on the container surface into the inlet of defoaming impeller 8 through suction section 12, which is designed to fit the shape of the container. Defoaming impeller 8 utilizes the shearing force and compression effect generated by the impeller to break bubbles, separating gas and liquid. The liquid is thrown towards the shell 9 by inertia. The liquid generated after defoaming flows along the shell 9 into the guide box 11, further dissipating energy and dispersing the defoamed fluid into the container to avoid conflict with the foam flow. Simultaneously, it guides the liquid downwards, completely isolating the foam and liquid flow within the container from motor 1. The positive or negative pressure created by the easily foaming medium within the container will not damage motor 1. Even if mechanical seal 5 is damaged, the foam or liquid flow will be intercepted by shaft expansion sleeve 3, preventing damage to motor 1. A mouth ring 10 is added between the suction inlet pipe and the impeller inner cavity, which increases the seal of the impeller suction inlet, reduces wear, improves the impeller's suction force, prevents internal circulation, and increases the impeller's efficiency. The guide box 11 connects the housing 9 and the suction section 12 through adjusting bolts. By changing the bolt connection length between the housing and the suction section, the mouth ring gap can be continuously adjusted within a certain range to adapt to different foam characteristics under different working conditions, ensuring suction efficiency while avoiding mouth ring wear, and facilitating installation and maintenance.

[0038] Please see Figure 2The motor 1 of this defoaming device can be either a power frequency motor or a variable frequency motor, and can be either explosion-proof or non-explosion-proof, or either high-efficiency or ordinary type. The motor bracket 2 is machined in one clamping operation on both the upper and lower surfaces, ensuring good concentricity. Both the upper and lower surfaces have stoppers to ensure concentric installation of the motor and the base plate. This part provides space for the installation of the mechanical seal 5. The shaft expansion sleeve 3 is secured with bolts to tighten the inclined surface, ultimately ensuring the impeller connecting shaft 4 firmly secures the motor shaft. This part helps prevent serious accidents such as process media and foam leakage from the mechanical seal 5, which could lead to motor burnout. The impeller connecting shaft 4 is machined in one clamping operation. This part successfully solves the problem of reliable connection between the motor and the impeller, ensuring good concentricity and reliable and stable operation of the device. The impeller connecting shaft can also be customized in length according to the site environment, currently up to two meters in length. Mechanical seal 5 employs a single-end face seal, with a stationary ring mounted on top. An O-ring blocks rising liquid within the sealing cavity, and high-speed rotational friction of the sealing surface forms a seal, preventing liquid leakage and environmental pollution. Sliding bearing 6 consists of a housing, a wear-resistant bushing, and a shaft sleeve. Sliding friction between the bushing and shaft sleeve provides shock absorption and support, balancing radial forces generated during operation. The shaft sleeve is internally connected to the impeller connecting shaft 4 via threads, ensuring a more robust and reliable connection. External spiral grooves reduce leakage of the sealing liquid. Mounting base 7 can be a round flange, a square flange, or a base made of a steel frame. Defoaming impeller 8 can be one or more combined impellers, which can be axial flow or fan-shaped. Furthermore, the impeller can be a welded plate impeller or a cast impeller. The hub has internal threads and keyways, ensuring reliable impeller connection while facilitating disassembly and maintenance, and preventing wear between the shaft and hub. Housing 9 is cylindrical or rectangular in shape. A mouth ring 10 is added between the suction inlet pipe and the impeller inner cavity to prevent wear, increase the seal of the impeller suction inlet, improve the impeller's suction force, prevent internal circulation, and increase the impeller's efficiency. The guide box 11 is connected to the housing 9 via circumferentially distributed adjusting bolts, allowing continuous adjustment of the mouth ring 10 gap to adapt to different foam characteristics under different working conditions, ensuring suction efficiency while preventing mouth ring wear, and facilitating installation and maintenance. The suction section 12 has a flared opening welded below the suction pipe and cross-shaped ribs welded to the bottom to prevent deformation and improve suction efficiency. The impeller nut 13 secures the defoaming impeller 8 to the impeller connecting shaft 4, ensuring stable and reliable operation. A wrench structure is provided on the outer circumference to tighten the impeller while transmitting torque, improving vibration resistance and preventing loosening, thus avoiding problems such as parts falling off during installation and operation.

[0039] Example 3:

[0040] Please see Figure 3This utility model provides a self-locking, green, high-pressure resistant physical defoaming device, including a motor 1, a motor bracket 2, a shaft expansion sleeve 3, an impeller connecting shaft 4, a mechanical seal 5, a sliding bearing 6, a mounting base 7, a defoaming impeller 8, a housing 9, a mouth ring 10, a flow guide box 11, a suction section 12, and an impeller nut 13.

[0041] Specifically, the defoaming device 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 to the motor shaft of the motor 1. The defoaming impeller 8 includes an impeller hub with a threaded hole for threaded connection to the impeller connecting shaft and a keyway. The impeller connecting shaft 4 has a transmission key that connects to the keyway. In this embodiment, by providing an internal thread inside the hub of the defoaming impeller 8, it can form a precise mesh with the impeller connecting shaft 4. The keyway, in conjunction with the internal thread, transmits the main torque, ensuring reliable impeller connection while facilitating disassembly and maintenance and preventing wear between the shaft and hub.

[0042] Please see Figure 3 There are multiple keyways and transmission keys, each connected in a one-to-one correspondence. The transmission key can be inclinedly mounted on the impeller connecting shaft 4 and then inserted obliquely into the corresponding inclined keyway, or the transmission key can adopt an L-shaped structure and be inserted into the corresponding L-shaped keyway.

[0043] Please see Figure 3The defoaming device further includes an impeller nut 13 for mounting the defoaming impeller on the impeller connecting shaft. The impeller nut 13 is located at the end of the impeller connecting shaft away from the motor 1. The defoaming device also includes a motor bracket 2 for supporting the motor 1, a mounting base 7 for supporting the motor bracket 2, and a housing 9 located below the mounting base 7. The defoaming impeller 8 is located in the housing 9. The bottom of the housing 9 has a suction section 12. The suction section 12 is provided with a mouth ring 10. A cross-shaped rib is welded to the bottom of the suction section 12. A flow guide box 11 is provided between the suction section 12 and the housing 9. The flow guide box 11 is detachably connected to the suction section 12. In this embodiment, the defoaming device mounting base 7 is mounted on the top of the container according to the size matching the container, and the motor 1 is firmly connected to the mounting base 7 using the motor bracket 2. Motor 1 drives defoaming impeller 8 to rotate via impeller connecting shaft 4, shaft expansion sleeve 3, mechanical seal 5, and sliding bearing 6. The rotation of defoaming impeller 8 creates suction force, drawing foam generated on the container surface into the inlet of defoaming impeller 8 through suction section 12, which is designed to fit the shape of the container. Defoaming impeller 8 utilizes the shearing force and compression effect generated by the impeller to break bubbles, causing gas-liquid separation. The liquid is thrown towards the shell 9 by inertia. The liquid generated after defoaming flows along the shell 9 into the guide box 11. The guide box 11 further dissipates the energy of the defoamed fluid while dispersing it into the container, avoiding conflict with the foam flow. Simultaneously, it guides the liquid downwards, completely isolating the foam and liquid flows within the container from motor 1. The positive or negative pressure created by the easily foaming medium within the container will not damage motor 1. Even if mechanical seal 5 is damaged, the foam or liquid flow will be intercepted by shaft expansion sleeve 3, preventing damage to motor 1. The defoaming impeller 8 has an internal thread inside its hub, which precisely meshes with the impeller connecting shaft 4. Together with the transmission key and impeller nut 13, it forms a reliable and stable connection, transmitting torque while providing axial clamping force. This provides vibration damping and anti-loosening effects, facilitating disassembly and maintenance. A mouth ring 10 is added between the suction inlet pipe and the impeller's inner cavity, increasing the seal at the impeller suction inlet, reducing wear, improving impeller suction, preventing internal circulation, and increasing impeller efficiency.

[0044] Please see Figure 3The motor 1 of this defoaming device can be either a power frequency motor or a variable frequency motor, and can be either explosion-proof or non-explosion-proof, or either high-efficiency or ordinary type. The motor bracket 2 is machined on both the upper and lower surfaces in a single clamping operation, ensuring good concentricity. Both the upper and lower surfaces have stoppers to ensure concentric installation of the motor and the base plate. This part provides space for the installation of the mechanical seal 5. The shaft expansion sleeve 3 is secured with bolts, tightening the inclined surface to the large surface, ultimately ensuring that the impeller connecting shaft 4 firmly secures the motor shaft. This part helps prevent serious accidents such as process media and foam leakage to motor 1, even if the mechanical seal 5 leaks, which could lead to motor burnout. The impeller connecting shaft 4 is clamped and machined entirely in one operation. This part successfully solves the problem of reliable connection between the motor and the impeller, ensuring good concentricity and reliable and stable operation of the device. The impeller connecting shaft can also be customized in length according to the site environment, currently up to two meters in length. Mechanical seal 5 employs a single-end face seal, with a stationary ring mounted on top. An O-ring blocks rising liquid within the sealing cavity, and a seal is formed through high-speed rotational friction of the sealing surface, preventing liquid leakage and environmental pollution. The sliding bearing 6 consists of a housing, a wear-resistant bushing, and a shaft sleeve. Sliding friction between the bushing and shaft sleeve provides shock absorption and support, balancing the radial force generated during operation. The shaft sleeve is internally connected to the impeller connecting shaft 4 via threads, ensuring a more robust and reliable connection. External spiral grooves reduce leakage of the sealing liquid. The mounting base 7 can be a round flange, a square flange, or a base made of a steel frame. The defoaming impeller 8 can be one or more combined impellers, which can be axial flow or fan-shaped. Furthermore, the impeller can be a welded plate impeller or a cast impeller. The hub has internal threads and keyways, ensuring reliable impeller connection while facilitating disassembly and maintenance, and preventing wear between the shaft and hub. The housing 9 is cylindrical or rectangular in shape. A mouth ring 10 is added between the suction inlet pipe and the impeller inner cavity to prevent wear, increase the seal of the impeller suction inlet, improve the impeller's suction force, prevent internal circulation, and increase the impeller's efficiency. The guide box 11 is a multi-piece threaded plate welded structure. A ring of small pillars is welded to the upper surface of the suction section, and the pillars are threaded to the shell. This guides the broken-up liquid into the container while strengthening the connection stability. The suction section 12 has a flared opening welded below the suction pipe and cross-shaped ribs welded to the bottom to prevent deformation and improve suction efficiency. The impeller nut 13 secures the defoaming impeller 8 to the impeller connecting shaft 4, ensuring stable and reliable operation. A wrench structure is provided on the outer periphery to tighten the impeller while transmitting torque, improving vibration resistance and preventing loosening, thus avoiding problems such as parts falling off during installation and operation.

[0045] Example 4:

[0046] Please see Figure 4This utility model provides a self-sealing, high-pressure resistant physical defoaming device, including a motor 1, an impeller connecting shaft 2, a packing seal 3, a mounting plate 4, a bearing housing 5, a sliding bearing 6, a housing 7, a defoaming impeller 8, an impeller nut 9, a mouth ring 10, and a suction section 11.

[0047] Specifically, the defoaming device includes a defoaming impeller 8 for eliminating foam and a motor 1 for driving the defoaming impeller 8 to rotate. The impeller connecting shaft 2 of the defoaming impeller 8 is coaxially connected to the motor shaft of the motor 1. The defoaming device also includes a bearing housing 5 for mounting the impeller connecting shaft 2. The bearing housing 5 is provided with a packing seal 3 and a sliding bearing 6. The packing seal 3 and the sliding bearing 6 are spaced apart, and the packing seal 3 is close to the motor 1. In this embodiment, by setting a sliding bearing 6 inside the designed bearing housing 5, the sliding bearing 6 can provide radial support to ensure the smooth and reliable operation of the impeller connecting shaft 2. Furthermore, due to the small clearance of the sliding bearing 6 and the effects of gravity, fluid viscosity, and possible pressure gradients, upward leakage of liquid is relatively difficult. This characteristic makes the sliding bearing constitute the first sealing barrier. The packing seal 3 located near the motor can form a second barrier to prevent foam or liquid from leaking upward along the axis, completely isolating the foam flow and liquid flow in the container from the motor. The foam flow or liquid flow caused by the positive or negative pressure formed by the easily foaming medium in the container will not damage the motor, thus achieving a self-sealing effect.

[0048] Please see Figure 4The bearing housing 5, near the motor 1, forms an installation cavity for mounting the packing seal 3, which surrounds the impeller connecting shaft 2. The packing seal 3 is fitted onto the impeller connecting shaft 2 via a sealing sleeve. This defoaming device also includes a pressure cap located in the installation cavity, which abuts against the packing seal 3. In this embodiment, the mounting plate 4 is mounted on top of the container to a size matching the container, and the motor 1 is directly and rigidly fixed to the mounting plate 4. Motor 1 drives defoaming impeller 8 to rotate via packing seal 3, sliding bearing 6, and impeller connecting shaft 2. After rotating, defoaming impeller 8 generates suction force, which draws the foam generated on the container surface into the inlet of defoaming impeller 8 through suction section 11, which is set along the shape of the container. Defoaming impeller 8 uses the shear force and compression effect generated by the impeller to break the bubbles and separate the gas and liquid. The liquid is thrown towards the shell 7 by inertial force. The liquid generated after defoaming is dispersed into the container through the drain hole of suction section 11 along the shell 7 to avoid conflict with the foam flow. Impeller nut 9 is installed at the end of impeller connecting shaft 2 at the bottom of the impeller to fasten the impeller and transmit torque, thereby improving the anti-vibration and anti-loosening performance. A sliding bearing 6 is installed at the lower end of the bearing housing 5, precisely fitting with the impeller connecting shaft 2 to provide radial support and ensure smooth and reliable operation of the impeller connecting shaft 2. The sliding bearing 6 has a small clearance, and due to gravity, fluid viscosity, and possible pressure gradients, upward leakage of liquid is difficult. This characteristic makes the sliding bearing 6 the first sealing barrier. An installation cavity is machined at the upper end, housing a packing seal 3 that surrounds the impeller connecting shaft 2. Appropriately tightened by a gland, it forms the second barrier to prevent foam or liquid leakage axially upwards, completely isolating the foam and liquid flow within the container from the motor 1. The positive or negative pressure generated by the easily foaming medium within the container will not damage the motor 1, achieving a self-sealing effect. A mouth ring 10 is added between the suction pipe and the impeller inner cavity, increasing the seal of the impeller suction port, reducing wear, improving the suction of the impeller 8, preventing internal circulation, and increasing the efficiency of the impeller 8.

[0049] Please see Figure 4This defoaming device includes a motor 1, which can be either a power frequency motor or a variable frequency motor, and can be either explosion-proof or non-explosion-proof, and can be either high-efficiency or ordinary type. An impeller connecting shaft 2 is assembled and machined in one operation. This part successfully solves the reliable connection between the motor and the impeller, ensuring good concentricity and reliable and stable operation of the device. The impeller connecting shaft can also be customized in length according to the site environment, currently up to two meters. The sealing element uses a packing seal, which achieves sealing by radial expansion of the packing through axial clamping force, preventing liquid leakage along the shaft and environmental pollution. It also works with a sealing bushing to avoid wear on the impeller connecting shaft. The mounting plate 4 can be a circular flange, a square flange, or a steel frame. The bearing housing 5, in conjunction with the bearing cover, isolates the bearing from the external environment to form a sealed space, simultaneously supporting the stable and reliable operation of the bearing and the seal. The sliding bearing 6 consists of a wear-resistant bushing, a bushing, and a cover. It achieves shock absorption and support through sliding friction between the bushing and the bushing, balancing the radial force generated during operation. The casing 7 is cylindrical or rectangular. The defoaming impeller 8 can be one or more combined impellers; it can be an axial flow type or a fan-shaped type. Furthermore, the impeller can be a welded plate impeller or a cast impeller. The impeller nut 9 has a wrench mechanism on its outer circumference, which tightens the impeller while transmitting torque. Combined with a gasket, it increases the friction surface and improves vibration resistance and anti-loosening performance. The inlet ring 10 adds a ring between the suction pipe and the impeller's inner cavity to prevent wear, increase the seal of the impeller suction port, improve the impeller's suction force, prevent internal circulation, and increase impeller efficiency. The suction section 11 has a flared opening welded below the suction pipe and cross-shaped ribs welded to the bottom to prevent deformation and improve suction efficiency. A ring of drain holes is also provided at the horizontal plate to prevent liquid accumulation inside the casing.

[0050] Therefore, this defoaming device adopts an integrated bearing housing structure and utilizes a double sealing system to effectively isolate the foam impact flow caused by positive or negative pressure in the container containing chemical media, preventing damage to the motor and pollution of the working environment. Simultaneously, the motor is directly connected to the mounting plate, resulting in a compact structure and reduced vibration, while ensuring stable and reliable operation of the device, reducing noise, and facilitating installation and use.

[0051] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A self-locking, green, high-pressure resistant 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 defoaming impeller includes an impeller hub, which has a threaded hole that is threadedly connected to the impeller connecting shaft, and a keyway on the impeller hub. The impeller connecting shaft has a transmission key that is connected to the keyway.

2. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 1, characterized in that: There are multiple keyways and transmission keys, and they are connected one-to-one.

3. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 1, characterized in that: It also includes an impeller nut for mounting the defoaming impeller on the impeller connecting shaft.

4. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 3, characterized in that: The impeller nut is located at the end of the impeller connecting shaft away from the motor.

5. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 1, characterized in that: It also includes a motor bracket for supporting the motor, a mounting base for supporting the motor bracket, and a housing located below the mounting base, wherein the defoaming impeller is located in the housing.

6. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 5, characterized in that: The bottom of the housing has an intake section.

7. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 6, characterized in that: The inhalation section is equipped with a mouth ring.

8. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 6, characterized in that: The bottom of the suction section is welded with a cross-shaped rib.

9. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 6, characterized in that: A flow guide box is provided between the inhalation section and the housing.

10. The self-locking, green, high-pressure resistant physical defoaming device as described in claim 9, characterized in that: The flow guide box is detachably connected to the suction section.

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