Rotor-stator assembly and multiphase self-priming homogenizing emulsifying pump using the assembly

Abstract

The present invention belongs to the technical field of emulsification and dispersion of powder-liquid mixtures, and specifically relates to a rotor-stator assembly and a multiphase self-priming homogenizing emulsifying pump using the assembly. The rotor-stator assembly includes a stator end cover and a rotor, and the stator end cover includes an end plate and a casing; the rotor includes an inner plate, and a self-priming impeller is arranged on the inner plate surface of the inner plate, and the inner plate surface covers the tube edge of the casing and / or the inner plate edge and the casing wall to form a plug-in fit; the rotor also includes a ring plate, and an outer impeller is convexly provided on the inner plate surface of the ring plate, and the outer plate surface of the inner plate is coaxially fixed to the outer impeller at the ring plate; the outer impeller and the self-priming impeller have the same rotation direction, and the blades of the outer impeller extend along the outer wall of the casing toward the end plate to form a dispersion wing. This rotor-stator assembly can always maintain a negative pressure working environment for the powder in the pump chamber. The present invention also provides a multiphase self-priming homogenizing emulsifying pump, thereby ensuring the homogenizing emulsification and dispersion efficiency of the material.

Description

Technical Field

[0001] The invention belongs to the technical field of emulsification and dispersion of powder-liquid mixed materials, and in particular relates to a rotor-stator assembly and a multiphase self-priming homogenizing emulsification pump using the assembly. Background Art

[0002] At present, in the industry, the mixing and dispersion of powder and liquid materials are mostly completed by homogenizing emulsifier pumps. In actual operation, the premixed materials of powder and liquid enter the pump cavity through the side wall or end of the homogenizing emulsifier pump; due to the 1 to 3 sets of dual interlocking multi-layer stators and rotors installed in the pump cavity of the homogenizing emulsifier pump, the high tangential speed and high-frequency mechanical effect generated by the high-speed rotation of the rotor will cause the sucked premixed materials to be subjected to strong mechanical and hydraulic shearing, centrifugal extrusion, liquid layer friction, impact tearing and turbulence in the narrow gap between the stator and rotor. The immiscible solid phase and liquid phase are instantly dispersed and emulsified evenly and finely under the joint action of the corresponding mature process and appropriate additives, and the dispersed and emulsified materials are pumped out through the discharge hole on the side wall of the pump body. The operational defect of the above existing structure is that due to the small specific gravity of the powder, when mixed with the liquid, it often produces wall hanging, balling, coagulation and other phenomena, which is one of the reasons why the powder and liquid must be premixed before entering the homogenizing emulsifier pump. However, when the powder is premixed externally, dust is prone to escape, which obviously cannot meet the existing environmental protection needs of enterprises. People have also considered directly pumping the powder and liquid into the homogenizing emulsification pump or sucking them under negative pressure, so as to complete the powder-liquid mixing and emulsification dispersion process at one time while meeting environmental protection requirements, so as to further reduce the processing procedures and improve processing efficiency. However, on the one hand, how to evenly disperse and mix the dust with a small specific gravity with the liquid flow at the moment of entering the liquid flow, without the powder hanging on the wall, forming balls, agglomerates or even blocking the discharge end of the powder inlet pipe due to the wetting of the liquid, this problem has always been unresolved. On the other hand, the idea of ​​a self-priming pump body is very beautiful; however, the powder may be accompanied by air when feeding, and the formation of a self-priming environment requires that the negative pressure environment cannot be destroyed. The traditional self-priming pump structure, once the powder containing air enters, the negative pressure environment is destroyed, causing the self-priming effect to weaken or even disappear for a short time, followed by powder flow interruption, which will greatly affect the uniformity of material discharge and the uniformity of the material during emulsification and dispersion, and then cause either reduced production capacity or quality problems of the mixed product, thus bringing many troubles to the normal and efficient operation of the enterprise. Summary of the invention

[0003] One of the objects of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a rotor-stator assembly with a reasonable structure and reliable and convenient use. The rotor-stator assembly can always maintain a negative pressure working environment for powder in the pump chamber, thereby meeting the needs of direct suction feeding and efficient online emulsification and dispersion of powder and liquid materials; another object of the present invention is to provide a multiphase self-priming homogenizing emulsification pump using the rotor-stator assembly, thereby ensuring the homogenizing emulsification and dispersion efficiency of the material, and having a positive impact on ensuring or even improving the actual production capacity of the enterprise.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A rotor-stator assembly comprises a stator end cover and a rotor for matching the stator end cover, wherein the stator end cover comprises an end plate and a casing coaxially protruded from a plate surface on one side of the end plate, a powder inlet is arranged through the end plate so as to communicate with a casing cavity, and a discharge hole for powder leakage is arranged through the casing wall; the rotor comprises an inner plate coaxially fixed to a pump shaft, with the side of the inner plate facing the end plate as the inner side, a self-priming impeller is arranged on the inner plate surface of the inner plate, the inner plate surface covers the edge of the casing and / or the inner plate edge and the casing wall form a plug-in fit, Thereby, the inner plate surface of the inner plate, the wall of the casing and the end plate are jointly enclosed to form a powder self-priming chamber for powder inhalation and temporary storage; the rotor also includes a ring plate, with the side of the ring plate facing the end plate as the inner side, an outer impeller is convexly provided on the inner plate surface of the ring plate, the outer plate surface of the inner plate is coaxially fixed to the outer impeller at the ring plate, and there is a matching gap between the outer plate surface of the inner plate and the inner plate surface of the ring plate for the liquid to move; the outer impeller and the self-priming impeller have the same rotation direction, and the blades of the outer impeller extend along the outer wall of the casing toward the end plate, thereby forming a dispersion wing for dispersing the material.

[0006] Preferably, the blades of the self-priming impeller and the external impeller are evenly distributed in sequence along the circumference of the inner plate, thereby forming a scroll-shaped impeller structure.

[0007] Preferably, the discharge holes are evenly distributed in sequence along the circumference of the casing; the discharge holes are rectangular holes and the length direction of the holes is parallel to the axis direction of the inner plate, and the distance between the end plate and the inner plate is greater than or equal to the hole length of the discharge holes.

[0008] A multiphase self-priming homogenizing emulsifying pump using the rotor-stator assembly comprises a power motor, a pump shaft coaxially fixedly connected to the power shaft of the power motor, a pump housing coaxially sleeved on the rotor-stator assembly, and a connecting frame for transitionally connecting the pump housing and the corresponding end of the power motor; the inner cylinder end of the pump housing is tightly sealed against the outer end face of the connecting frame, so that the outer end face of the connecting frame, the cylinder wall of the pump housing and the outer plate surface of the ring plate jointly form a liquid temporary storage cavity for liquid to enter, and a liquid inlet is arranged through a section of the shell wall of the pump housing located at the liquid temporary storage cavity; the outer cylinder end of the pump housing is tightly sealed against the plate surface of the end plate, so that the end plate, the cylinder wall of the pump housing, the outer wall of the casing and the inner plate surface of the ring plate jointly enclose a dispersion cavity for stirring liquid and powder; a material outlet for discharging is arranged through the outer wall of the pump housing where the dispersion cavity is located.

[0009] Preferably, the end plate is coaxially protruded with a circular base toward the inner plate, and the protective tube is coaxially arranged on the circular base; the outer edge of the circular base, the outer edge of the outer impeller and the outer edge of the ring plate are all flush with each other; the cylinder diameter of the pump casing is equal to the diameter of the circular base.

[0010] Preferably, a tensioning screw is hingedly provided on the connecting frame, and a matching groove is radially recessed at the end plate for the tensioning screw to be inserted into and axially press the end plate and the pump casing onto the connecting frame.

[0011] The beneficial effects of the present invention are:

[0012] 1) Abandoning the traditional single-impeller rotor-stator shearing and stirring structure, the internal and external double-layer impeller structure is adopted in a different way: on the one hand, the inner impeller is used to form a self-priming impeller, and cooperates with the casing, end plate and inner plate to form a powder self-priming cavity to achieve an independent self-priming feeding effect for the powder. On the other hand, the outer impeller has both the functions of liquid suction and powder-liquid mixing. After the powder and liquid flow into the matching gap through the ring cavity at the ring plate, the powder thrown out at the dispersing wing area and the discharge hole will be evenly mixed and dispersed, thereby simultaneously meeting the direct suction feeding of powder and liquid and the efficient online emulsification and dispersion of materials.

[0013] Obviously, it can be seen from the above structure that the powder self-priming cavity of the present invention is artificially isolated from the feeding path of the liquid material, and the traveling path of the liquid material is covered outside the casing or the powder self-priming cavity, thereby forming an inclusive working purpose of "liquid outside the powder". In this way, the liquid flow always flows outside the casing and will not invade the powder space inside the casing. The advantages are: first, the liquid flow always surrounds the powder self-priming cavity, realizing the automatic liquid sealing effect of the powder self-priming cavity, ensuring the formation of a vacuum negative pressure environment in the powder self-priming cavity, and ensuring the continuous self-priming effect of the powder. Secondly, even if there is some air in the powder and it is entrained and brought into the powder self-priming chamber; due to the same-direction self-priming layout of the outer impeller, it always generates negative pressure suction on the powder self-priming chamber synchronously. Therefore, the outer impeller will immediately suck away the residual air in the powder self-priming chamber, thereby avoiding many problems such as liquid backflow wetting the powder due to pressure loss in the powder self-priming chamber, ensuring that the powder self-priming chamber where the self-priming impeller is located is always in a dry negative pressure self-priming environment.

[0014] In summary, the above-mentioned "liquid outside and powder inside" working structure of the present invention enables the present invention to always maintain a negative pressure working environment for the powder in the pump chamber, thereby ensuring the homogeneous emulsification and dispersion efficiency of the material in the pump body used in the present invention, and having a favorable impact on ensuring or even improving the actual production capacity of the enterprise.

[0015] 2) The specific blade layout of the self-priming impeller and the outer impeller can be designed with reference to the existing conventional self-priming blade structure. The present invention preferably uses a scroll layout to facilitate the overall design. The function of the discharge hole is to achieve uniform diffusion of the powder after the powder is self-sucked, so as to uniformly contact with the liquid material "wrapped" on the periphery of the powder self-priming cavity and uniformly emulsify and disperse, so as to ensure the uniformity of material dispersion.

[0016] 3) In actual use, the rotor-stator assembly must eventually be applied to a multiphase self-priming homogenizing emulsification pump to achieve its homogenizing emulsification function. The present invention adopts the method of feeding powder at the end, feeding liquid at the side, and discharging at the side, so as to achieve the self-priming working requirements of the powder. Since the powder is directly self-priming and does not require external premixing, it not only meets the actual environmental protection needs, but also simplifies the process, the production cost is obviously lower, and the work efficiency is further improved, achieving multiple goals at one stroke.

[0017] 4) The arrangement of the circular base not only enables the pump housing to accurately fit on the end plate in a stop-like manner, but the convex circular base also further optimizes the sealing performance with the pump housing and improves the sealing effect between the pump housing and the end plate. If necessary, an annular recessed groove can even be concavely arranged at the outer edge of the circular base, so as to further improve the actual sealing effect by adding a sealing ring. The setting of the tensioning screw ensures the disassembly and assembly performance of the entire pump body; during assembly, maintenance and overhaul, quick disassembly and assembly can be achieved by simply disassembling and assembling the tensioning screw, without the need for time-consuming and laborious multiple and frequent disassembly of fixing screws, etc., and the assembly, maintenance and overhaul efficiency can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 for Figure 1 A schematic cross-sectional view of the structure shown;

[0020] Figure 3 for Figure 1 A three-dimensional exploded view of the structure shown;

[0021] Figure 4-5 It is a three-dimensional structural schematic diagram of the rotor-stator assembly;

[0022] Figure 6 The three-dimensional structure explosion diagram of the rotor-stator assembly;

[0023] Figure 7 Schematic diagram of the three-dimensional structure of the rotor.

[0024] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0025] a- Powder material inlet b- Liquid material inlet c- Material outlet

[0026] 10- Stator end cover

[0027] 11-end plate 11a-matching groove 12-casing 12a-discharge hole 13-round base

[0028] 20-Rotor

[0029] 21-inner plate 22-self-priming impeller 23-ring plate 24-outer impeller 24a-dispersing wing

[0030] 30-power motor 40-pump shaft 50-pump housing

[0031] 60-connecting frame 61-tensioning screw DETAILED DESCRIPTION

[0032] For ease of understanding, here we take the entire multiphase self-priming homogenizing emulsification pump as an example, combined with Figure 1-7 The specific structure and working mode of the present invention are further described as follows:

[0033] The specific structure of the multiphase self-priming homogenizing emulsifying pump of the present invention is as follows Figure 1-3 As shown, based on the direction in the figure, it includes a power motor 30, a connecting frame 60, a pump housing 50 and a rotor-stator assembly arranged in axial order from right to left. Among them, the power shaft of the power motor 30 is coaxially fixed to the pump shaft 40 through a coupling, and the pump shaft 40 needs to be sealed by a mechanical seal assembly when passing through the connecting frame 60 to prevent the liquid from infiltrating along the matching gap between the pump shaft 40 and the connecting frame 60.

[0034] In actual operation, a tensioning screw rod 61 is arranged on the connecting frame 60, and one end of the tensioning screw rod 61 is as shown in FIG. Figure 3 The hinge shown is at the outer wall of the connecting frame 60, and the other end spans across the pump housing 50, forming a snap-fit ​​relationship with the preset matching groove 11a at the end plate 11 of the rotor-stator assembly, thereby tightening the components in the axial direction to achieve the purpose of convenient disassembly and assembly.

[0035] The specific structure of the rotor-stator assembly is the key part of the present invention. Figure 4-7 As shown, it is composed of a stator end cover 10 and a rotor 20, wherein:

[0036] The stator end cover 10 has an appearance as follows: Figure 6 As shown, it includes a circular plate-shaped end plate 11 and a circular base 13 coaxially protruded from one side of the end plate 11, and a casing 12 with a discharge hole 12a coaxially protruded from the circular base 13. The above-mentioned matching grooves 11a are uniformly distributed on the outer edge of the end plate 11 in the circumferential direction. The stator end cover 10 is constructed with Figure 6-7 As shown in the figure, it is composed of a ring plate 23 with an outer impeller 24 and an inner plate 21 with a self-priming impeller 22. The inner plate surface of the ring plate 23, that is, the left plate surface, is arranged with a scroll-shaped outer impeller 24, and the inner plate 21 is coaxially superimposed on the outer impeller 24, and the inner plate surface of the inner plate 21, that is, the left plate surface, is arranged with a scroll-shaped self-priming impeller 22. It is worth noting that at this time, the self-priming impeller 22 and the outer impeller 24 rotate in the same direction, and the outer impeller 24 has an outer diameter greater than the outer diameter of the self-priming impeller 22, and the blades of the outer impeller 24 also extend axially toward the end plate 11 to form an extension structure, thereby forming a structure as shown in FIG. Figure 7 Dispersing wings 24a are shown.

[0037] When the rotor 20 and the stator end cover 10 are Figure 4-6 When coaxially assembled as shown, the fit is as follows Figure 3The pump housing 50 and the connecting frame 60 shown in the figure, at this time: the inner plate 21 is directly inserted into the casing 12, so that the inner plate 21, the casing 12 and the end plate 11 are enclosed together to form a powder self-priming chamber for powder inhalation and temporary storage. The pump housing 50 assembled on the connecting frame 60 is directly sleeved on the outer edge of the ring plate 23, so that the left end face of the connecting frame 60, the cylinder wall of the pump housing 50 and the outer plate surface of the ring plate 23, that is, the right plate surface, together form a liquid temporary storage chamber for liquid to enter. The end plate 11, the cylinder wall of the pump housing 50, the outer wall of the casing 12 and the inner plate surface of the ring plate 23, that is, the left plate surface, together form a dispersion chamber for stirring liquid and powder. During actual feeding, the powder enters the powder self-priming chamber from the powder inlet a, and the liquid enters the liquid temporary storage chamber from the liquid inlet b, and finally the two converge at the stirring chamber and are dispersed and stirred at high speed by the dispersion wings, and the homogeneously dispersed mixed material is discharged from the pump body through the material outlet c.

[0038] Of course, the above is only one specific embodiment of the present invention. In actual operation, other accessories except the rotor-stator assembly may be replaced with conventional accessories, or the discharge hole 12a at the casing 12 may be designed with other shapes or even replaced with a toothed structure, or the blade shapes of the self-priming impeller 22 and the outer impeller 24 may be conventionally changed, etc. Such conventional structural changes based on the known structure of the present invention shall be regarded as equivalent or similar designs and fall within the protection scope of the present invention.

Claims

1. A rotor-stator assembly, characterized in that: The invention comprises a stator end cover (10) and a rotor (20) for matching with the stator end cover (10), wherein the stator end cover (10) comprises an end plate (11) and a casing (12) coaxially protruding from a plate surface of one side of the end plate (11), a powder inlet (a) is arranged through the end plate (11) so as to communicate with the casing cavity of the casing (12), and a discharge hole (12a) for allowing powder to be discharged is arranged through the casing wall of the casing (12); the rotor (20) comprises an inner plate (21) which can be coaxially fixed to a pump shaft (40), with the side of the inner plate (21) facing the end plate (11) as the inner side, a self-priming impeller (22) is arranged on the inner plate surface of the inner plate (21), the plate surface of the inner plate (21) covers the edge of the casing (12) and / or the plate edge of the inner plate (21) and the casing wall of the casing (12) form a plug-in fitting. The rotor (20) is configured to be coupled to the inner plate surface of the inner plate (21), the wall of the casing (12) and the end plate (11) so that the inner plate surface of the inner plate (21), the wall of the casing (12) and the end plate (11) together form a powder self-priming chamber for powder inhalation and temporary storage; the rotor (20) further comprises a ring plate (23), with the side of the ring plate (23) facing the end plate (11) being the inner side, an outer impeller (24) being convexly provided on the inner plate surface of the ring plate (23), the outer plate surface of the inner plate (21) being coaxially fixed to the outer impeller (24) at the ring plate (23), and a matching gap for liquid to travel exists between the outer plate surface of the inner plate (21) and the inner plate surface of the ring plate (23); the outer impeller (24) and the self-priming impeller (22) have the same rotation direction, and the blades of the outer impeller (24) extend along the outer wall of the casing (12) toward the end plate (11), thereby forming a dispersion wing (24a) for dispersing the material; The blades of the self-priming impeller (22) and the outer impeller (24) are uniformly distributed in sequence along the circumference of the inner plate (21), thereby forming a scroll-shaped impeller structure; The discharge holes (12a) are evenly distributed in sequence along the circumference of the casing (12); the discharge holes (12a) are rectangular holes, and the length direction of the holes is parallel to the axial direction of the inner plate (21); and the distance between the end plate (11) and the inner plate (21) is greater than or equal to the hole length of the discharge hole (12a).

2. A multiphase self-priming homogenizing emulsifying pump using the rotor-stator assembly as claimed in claim 1, characterized in that: The invention comprises a power motor (30), a pump shaft (40) coaxially fixedly connected to the power shaft of the power motor (30), a pump housing (50) coaxially sleeved on the rotor-stator assembly, and a connecting frame (60) for transitionally connecting the pump housing (50) and the corresponding ends of the power motor (30); the inner cylinder end of the pump housing (50) is tightly sealed against the outer end surface of the connecting frame (60), so that the outer end surface of the connecting frame (60), the cylinder wall of the pump housing (50) and the outer plate surface of the ring plate (23) together form a liquid-carrying A liquid material temporary storage chamber for the material to enter is provided, and a liquid material inlet (b) is arranged through a section of the shell wall of the pump shell (50) located at the liquid material temporary storage chamber; the outer cylinder end of the pump shell (50) is tightly sealed against the plate surface of the end plate (11), so that the end plate (11), the cylinder wall of the pump shell (50), the outer wall of the casing (12) and the inner plate surface of the ring plate (23) are jointly enclosed to form a dispersion chamber for stirring liquid material and powder material; and a material outlet (c) for discharging the material is arranged through the outer wall of the pump shell (50) where the dispersion chamber is located.

3. A multiphase self-priming homogenizing emulsification pump according to claim 2, characterized in that: The end plate (11) is coaxially provided with a circular base (13) protruding in the direction of the inner plate (21); the casing (12) is coaxially arranged on the circular base (13); the outer edge of the circular base (13), the outer edge of the outer impeller (24) and the outer edge of the ring plate (23) are all flush with each other; and the diameter of the pump casing (50) is equal to the diameter of the circular base (13).

4. A multiphase self-priming homogenizing emulsification pump according to claim 2, characterized in that: A tensioning screw rod (61) is hingedly provided on the connecting frame (60), and a matching groove (11a) is radially recessed at the end plate (11) for the tensioning screw rod (61) to be inserted and axially press the end plate (11) and the pump housing (50) onto the connecting frame (60).

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