Magnetic stirring bag

Abstract

The utility model discloses a magnetic stirring bag, belongs to the technical field of stirring and mixing, and solves the technical problems that in an existing magnetic stirring bag, the contact area of a base and an installation disc is large, abrasion is large, and decoupling is prone to occurring. The stirring paddle comprises a base and a paddle blade mounted on the base; the mounting disc comprises a first wall part with an inner surface and an outer surface, the base is supported on the inner surface, a driving magnetic head arranged outside the magnetic stirring bag is arranged on one side of the outer surface, the base and the driving magnetic head form magnetic coupling, and the base can rotate around a first axis relative to the mounting disc; one of the inner surface and the base is provided with a matching groove located at the first axis, the other one of the inner surface and the base is provided with a matching protrusion inserted into the matching groove in the axial direction of the first axis, and the first wall part and the base are in unique contact and running fit only through the matching protrusion and the matching groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of stirring and mixing, especially to a magnetic stirring bag. BACKGROUND

[0002] In the pharmaceutical process of chemistry and biology, in order to meet the cleanliness requirements of relevant regulations, a plurality of materials are usually mixed in a stirring bag (or a biological reaction bag); in particular, in order to meet the characteristics of high value, poor mechanical resistance and high sterility requirements of biological materials such as proteins, plasmids and cells, a magnetic stirring paddle is widely used in the stirring process of the above biological materials due to its paddle and driving motor contactless magnetic coupling working principle.

[0003] For example, the publication number CN207287320U discloses a kind of magnetic mixing system, including the bag inside and bag outside part isolated by isolating sleeve tray, bag inside part includes stirring paddle, bag inside magnet and the base and base cover of encapsulating bag inside magnet, bag outside part includes driving motor and bag outside magnet, wherein bag inside magnet is encapsulated in shell, and the upper central portion of bag outside magnet has recessed portion receiving base and base cover (which encapsulates bag inside magnet), by magnetic coupling between bag inside magnet and bag outside magnet, with motor driving bag outside magnet rotates, thereby driving bag inside magnet rotates to realize stirring paddle rotation.

[0004] However, since the base and base cover and the recessed portion of bag outside magnet are in surface-to-surface contact, the base and base cover and the recessed portion of bag outside magnet are prone to wear; and under the action of external force, radial deviation between the two is prone to occur, thereby causing decoupling between the two, resulting in power transmission weakening or even failure, thereby affecting the normal use of the magnetic stirring device. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a magnetic stirring bag that can reduce the contact area of the base and the mounting disc to reduce wear of the base and the mounting disc, and can reduce the decoupling risk to improve the reliability of magnetic coupling.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A magnetic stirring bag, comprising:

[0008] a bag body;

[0009] a stirring paddle comprising a base and a paddle mounted on the base;

[0010] The mounting disc comprises a first wall portion having an inner surface and an outer surface, a base supported on the inner surface, and a driving magnetic head arranged outside the magnetic stirring bag on one side of the outer surface, wherein the base forms a magnetic coupling with the driving magnetic head and is rotatable relative to the mounting disc about a first axis;

[0011] One of the inner surface and the base is provided with a matching groove at the first axis, and the other is provided with a matching protrusion axially inserted into the matching groove along the first axis, and the first wall portion is in contact with the base only through the matching protrusion and the matching groove and is rotationally matched.

[0012] In the utility model, one of the inner surface and the base is provided with a matching groove at the first axis, and the other is provided with a matching protrusion axially inserted into the matching groove along the first axis, and the first wall portion is in contact with the base only through the matching protrusion and the matching groove and is rotationally matched, so that the base is rotatable relative to the mounting disc about the first axis, and the matching of the matching protrusion and the matching groove can limit the radial direction of the base, thereby effectively preventing the base from being radially offset relative to the mounting disc and causing decoupling of the base and the driving magnetic head, thereby reducing the decoupling risk and improving the reliability of the magnetic coupling. In addition, the first wall portion is in contact with the base only through the matching protrusion and the matching groove, which greatly reduces the contact area of the base and the mounting disc compared with the mode of arranging a large number of protrusions or arranging an annular matching groove and a matching protrusion, thereby reducing the wear of the base and the mounting disc and prolonging the service life of the base and the mounting disc.

[0013] The matching protrusion has a first curved surface, the matching groove has a second curved surface in contact with the first curved surface, the curvature radius of the first curved surface is R1, the curvature radius of the second curved surface is R2, and 0.3 < R1 / R2 ≤ 1 is satisfied. Such design can improve the smoothness of the rotation of the base. In addition, the closer the R1 / R2 ratio is to 1, the larger the contact area of the first curved surface and the second curved surface, so that the support stability of the base is higher, and the radial limiting effect of the base is better, thereby further reducing the decoupling risk. The smaller the R1 / R2 ratio is, the smaller the contact area of the first curved surface and the second curved surface is, so that the support stability of the base is poor and the radial limiting effect is worse, and decoupling is prone to occur. Therefore, in the technical scheme, the R1 / R2 ratio is between 0.3 and 1, so that the support stability of the base can be improved, and the risk of decoupling can be reduced.

[0014] The matching protrusion has an insertion section in the matching groove and an exposed section outside the matching groove, the axial length of the insertion section is L1, and 0.03 < L1 / R1 < 0.45 and 0.03 < L1 / R2 < 0.45 are met. The greater L1 / R1 and L1 / R2 are, that is, the greater the axial insertion length is and the more curved the first curved surface and the second curved surface are, the more conducive to improving the radial limiting effect on the base and reducing the contact area, and the more conducive to reducing decoupling and wear; but if L1 / R1 and L1 / R2 are too large, the depth of the matching groove will be too large, thereby causing the mechanical strength of the component provided with the matching groove to decrease; and if L1 / R1 and L1 / R2 are too small, decoupling is more likely. Therefore, in the technical solution, 0.03 < L1 / R1 < 0.45 and 0.03 < L1 / R2 < 0.45 are met, which can reduce the risk of decoupling, effectively reduce the contact area, and also ensure the mechanical strength of the component provided with the matching groove.

[0015] The axial thickness of the first wall portion is H1, the matching protrusion has an insertion section in the matching groove and an exposed section outside the matching groove, the axial length of the insertion section is L1, and 0.03 < L1 / H1 < 0.4 is met. If L1 / H1 is less than or equal to 0.03, the axial length of the insertion section is too small, and decoupling is likely to occur; if L1 / H1 is greater than or equal to 0.4, when the matching groove is arranged on the first wall portion, the thickness of the first wall portion will be too small, and the first wall portion is likely to deform. Therefore, in the technical solution, the ratio of L1 / H1 is between 0.03 and 0.4, which can reduce the risk of decoupling and avoid the first wall portion from deforming due to being too thin.

[0016] The mounting disc further includes a second wall portion arranged around the first wall portion, the second wall portion cooperates with the first wall portion to form a mounting groove, and the base is located in the mounting groove. A first gap exists between the inner circumferential side of the second wall portion and the outer circumferential side of the base. In this way, the second wall portion can further limit the radial displacement of the base, preventing the base from being unable to return to the original position after decoupling, that is, ensuring that the base can return to the original position after decoupling.

[0017] The radial dimension of the first gap is L2, and the distance between the edge of the matching groove and the first axis is L3, and 0.05 < L2 / L3 < 1.85 is met. In this way, the degree of radial displacement of the base from the first axis can be further limited. If L2 / L3 is greater than or equal to 1.85, the base will be unable to return to the original position due to too large a displacement, thereby improving the reliability of magnetic coupling.

[0018] The installation disc further comprises a peripheral portion connected with the first wall portion and surrounding outside the first wall portion, the peripheral portion is welded with the bag body, and the peripheral portion is curved radially outwardly away from the paddle direction. Due to the axial magnetic driving force generated between the base and the driving magnetic head, the axial magnetic driving force drives the installation disc to move axially towards the driving magnetic head. In addition, during the assembly of the installation disc and the tank body, the peripheral portion will be subjected to a pressing force in the same direction as the axial magnetic driving force. Therefore, if the peripheral portion is flat, the peripheral portion is not easy to deform or the deformation amount is small. Thus, the peripheral portion cannot offset most of the axial magnetic driving force and the pressing force by itself under the action of the pressing force and the axial magnetic driving force, so that most of the pressing force and the axial magnetic driving force are transmitted to the outer end of the peripheral portion, causing the outer end of the peripheral portion to be upturned and the welded part of the bag body to be cracked and damaged, and to interfere with the paddle. In the present scheme, by arranging the curved peripheral portion, the deformation capacity of the peripheral portion is increased, so that the peripheral portion can deform more after being subjected to external force (axial magnetic driving force and pressing force, etc.) to offset greater external force, thereby reducing the external force transmitted to the outer end of the peripheral portion, so that the stress on the outer end of the peripheral portion is smaller, thereby reducing the influence of external force and avoiding the outer end of the peripheral portion from being upturned and the welded part of the bag body from being cracked and damaged, and from interfering with the paddle.

[0019] The peripheral portion comprises a plurality of inclined segments connected in sequence away from the paddle direction, each inclined segment is inclined radially outwardly away from the paddle direction, and the inclination angles of the plurality of inclined segments gradually increase away from the paddle direction. In this way, the bending degree of the peripheral portion can be increased, and it is also easier for the peripheral portion to arch and deform towards the paddle direction and to deform more to offset the influence of external force, thereby avoiding the outer end of the peripheral portion from being upturned.

[0020] The mounting disc further comprises a second wall portion arranged around the first wall portion, the second wall portion cooperates with the first wall portion to form a mounting groove, the base is rotatably mounted in the mounting groove, a first gap exists between the second wall portion and the outer circumferential side of the base, the circumferential portion is connected to the top end of the second wall portion, the circumferential portion comprises an inner end arranged close to the first axis and an outer end arranged away from the first axis, the distance between the top surface of the inner end and the bottom surface of the outer end is S1, the distance between the top surface of the inner end and the outer surface of the first wall portion is S2, and 0.05 < S1 / S2 < 0.35 is satisfied. If the S1 / S2 ratio is less than or equal to 0.05, the bending degree of the circumferential portion tends to be small away from the paddle direction, and after the circumferential portion is subjected to an external force (axial magnetic driving force and pressing force, etc.), the circumferential portion is not easy to deform arching towards the paddle direction or the deformation degree is small, thereby causing the outer end of the circumferential portion to be more prone to upwarping, and thus reducing the firmness of the welding portion of the circumferential portion and the bag body. If the S1 / S2 ratio is greater than or equal to 0.35, the bending degree of the circumferential portion tends to be large away from the paddle direction, and when the position of the bag body is uneven, the circumferential portion is easy to interfere with the bag body, causing damage to the bag body. In the technical solution, S1 / S2 is between 0.05 and 0.35, which not only ensures the firmness of the welding portion of the circumferential portion and the bag body, but also avoids interference of the circumferential portion with the bag body.

[0021] The mounting disc further comprises a reinforcing portion arranged around the second wall portion, the reinforcing portion is connected between the circumferential portion and the top end of the second wall portion, and the plane where the reinforcing portion is located is perpendicular to the first axis. In this way, the transmission distance of the axial magnetic driving force to the circumferential portion can be increased, so as to increase the loss of the force in the transmission process, and thus reduce the stress on the circumferential portion, so that a small deformation of the circumferential portion can offset the external force, thereby further avoiding the cracking of the welding portion of the bag body due to the upwarping of the outer end of the circumferential portion.

[0022] The radial length of the circumferential portion is W1, and the radial length of the reinforcing portion is W2, and 0.25 < W1 / W2 < 0.5 is satisfied. In this way, if W1 / W2 is less than or equal to 0.25, the radial length W1 of the bent circumferential portion is too small and the radial length W2 of the straight reinforcing portion is too large, causing the circumferential portion to have a small bending deformation degree or unable to have a bending deformation, thereby reducing the firmness of the welding portion of the circumferential portion and the bag body. If W1 / W2 is greater than or equal to 0.5, the radial length W1 of the bent circumferential portion is too large and the radial length W2 of the straight reinforcing portion is too small, causing the force transmission distance between the second wall portion and the circumferential portion to be small, the loss of the force transmission process is small, and thus the stress on the circumferential portion is increased, causing the circumferential portion to have excessive deformation towards the paddle direction, thereby causing the outer end of the circumferential portion to crack with the welding portion of the bag body. In the technical solution, W1 / W2 is between 0.25 and 0.5, which not only effectively increases the transmission distance of the force, but also helps to reduce the bending degree of the circumferential portion towards the paddle direction, thereby ensuring the firmness of the welding portion of the circumferential portion and the bag body.

[0023] And / or the peripheral part and the reinforcing part have an included angle θ, satisfying 0 < θ < 20°. In this way, if the angle θ is too small or too large, the peripheral part cannot be deformed by bending towards the direction close to the paddle to eliminate the influence of the axial magnetic driving force, resulting in the welding between the peripheral part and the bag body cracking. By reasonably setting the range of θ, the peripheral part can be deformed by bending towards the direction close to the paddle to eliminate the influence of the axial magnetic driving force, thereby ensuring the firmness of the welding between the peripheral part and the bag body.

[0024] The base includes a magnetic element forming a magnetic coupling with the driving magnetic head. The base has a groove provided at the center of the base and a containing cavity surrounding the outside of the groove. The magnetic element is installed in the containing cavity, and the matching protrusion is a matching column provided in the groove. By providing the groove, not only can the weight be reduced, but a circulation space is also formed to circulate the accumulated material inside.

[0025] A plurality of circumferentially spaced and axially extending stirring ribs are provided on the outer periphery of the matching column, and a second gap exists between the stirring ribs and the inner periphery of the groove. In this way, the stirring ribs can be provided to enhance the stirring effect on the accumulated material in the groove, facilitating the discharge of the accumulated material in the groove. At the same time, the design of the stirring ribs also increases the structural strength of the matching column.

[0026] The base includes a housing having a containing groove and a cover plate for closing the slot of the containing groove. A welding portion is provided at the slot of the containing groove and welded with the cover plate. The magnetic element is installed in the containing cavity formed by the containing groove and the cover plate. A limiting portion is provided between the containing cavity and the magnetic element to limit the circumferential relative rotation of the two. In this way, the magnetic element can be conveniently installed and fixed, and the circumferential rotation of the magnetic element is also avoided to enable the magnetic coupling with the driving magnetic head.

[0027] The limiting portion is provided between the bottom wall of the containing groove and the magnetic element. The axial distance H2 between the limiting portion and the welding portion is not less than 10 mm. In this way, the transmission distance between the welding portion and the limiting portion can be increased to reduce the stress on the welding portion, thereby effectively preventing the welding portion from cracking.

[0028] The limiting portion includes a limiting protruding column provided on the bottom wall of the containing groove and a limiting recess provided on the magnetic element. The limiting protruding column and the limiting recess are inserted and matched. The limiting protruding column extends towards the slot of the containing groove, and an axial gap exists between the inner bottom of the limiting recess and the end of the limiting protruding column. In this way, the limiting protruding column can be entirely located in the limiting recess to improve the circumferential limiting reliability of the magnetic element. In addition, the existence of the axial gap also reduces the machining precision requirements of the limiting recess and the limiting protruding column in the axial direction.

[0029] The side of the cover plate close to the magnetic member is provided with an elastic member, and the elastic member abuts against the magnetic member, so that the axial limiting reliability of the magnetic member is improved, the axial movement of the magnetic member is avoided, and the reliability of the magnetic coupling is ensured.

[0030] These features and advantages of the present application will be described in detail in the following specific embodiments, drawings. BRIEF DESCRIPTION OF DRAWINGS

[0031] The present application will be further described in conjunction with the drawings as follows:

[0032] Figure 1 It is an exploded view of the stirring paddle and the mounting disc in the first embodiment of the present application.

[0033] Figure 2 It is a structural schematic view of the mounting disc and the assembled stirring paddle in the first embodiment of the present application.

[0034] Figure 3 It is a structural schematic view of the housing and the paddle in the first embodiment of the present application.

[0035] Figure 4 It is a structural schematic view of the stirring paddle and the mounting disc after assembly in the first embodiment of the present application.

[0036] Figure 5 It is a sectional view of the stirring paddle and the mounting disc after assembly in the first embodiment of the present application.

[0037] Figure 6 It is a sectional view of the stirring paddle and the mounting disc after assembly in the first embodiment of the present application. Figure 5

[0038] Figure 7 It is a sectional view of the stirring paddle and the mounting disc after assembly in the second embodiment of the present application.

[0039] Figure 8 It is a sectional view of the mounting disc in the third embodiment of the present application.

[0040] Figure 9 It is a sectional view of the mounting disc in the fourth embodiment of the present application.

[0041] LIST OF REFERENCE NUMERALS

[0042] 001, first gap; 002, second gap;

[0043] ​100, stirring paddle; 110, base; 1101, shell; 1102, cover plate; 111, matching protrusion; 1110, first curved surface; 1111, insertion section; 1112, exposed section; 112, groove; 113, accommodating cavity; 1131, welding portion; 114, stirring protrusion; 120, paddle; 130, magnetic member; 140, limiting portion; 141, limiting protrusion; 142, limiting recess; 200, mounting disc; 201, mounting groove; 210, first wall portion; 211, inner surface; 212, outer surface; 213, matching groove; 2130, second curved surface; 220, second wall portion; 230, peripheral portion; 231, inner end; 232, outer end; 233, inclined section; 240, reinforcing portion. DETAILED DESCRIPTION

[0044] The technical solutions of the embodiments of the utility model are explained and described below in combination with the drawings of the embodiments of the utility model. However, the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without making creative efforts all belong to the protection scope of the utility model. In addition, it should be understood that the words indicating direction or position relationship such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "vertical", "horizontal", "top", "bottom" etc. only based on the direction or position relationship shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device / element must have a particular direction or be constructed and operated in a particular direction, therefore, it cannot be understood as a limitation to the utility model.

[0045] Embodiment one

[0046] Referring to Figures 1 to 6 The magnetic stirring bag in the embodiment includes a bag body (not shown in the figure), a stirring paddle 100 and a mounting disc 200, wherein the stirring paddle 100 includes a base 110 and a paddle 120 mounted on the top of the base 110, the mounting disc 200 includes a first wall portion 210, the first wall portion 210 has an inner surface 211 and an outer surface 212, the base 110 is supported on the inner surface 211, one side of the outer surface 212 has a driving magnetic head (not shown in the figure) arranged outside the magnetic stirring bag, the base 110 forms a magnetic coupling with the driving magnetic head, and the base 110 can rotate relative to the mounting disc 200 around a first axis O.

[0047] The inner surface 211 in the embodiment is provided with a matching groove 213 located at the first axis O, that is, the first axis O is arranged through the matching groove 213, and the base 110 is provided with a matching protrusion 111. When the stirring paddle 100 is assembled with the mounting disc 200, the matching protrusion 111 is inserted into the matching groove 213 along the axial direction of the first axis O. After the stirring paddle 100 is assembled with the mounting disc 200, the first wall portion 210 and the base 110 are only in contact and rotationally matched with each other through the matching protrusion 111 and the matching groove 213, that is, the first wall portion 210 and the base 110 are only in contact through the matching protrusion 111 and the matching groove 213. In other words, the part of the first wall portion 210 outside the matching groove 213 is spaced apart from the part of the base 110 outside the matching protrusion 111 to avoid contact, and the matching protrusion 111 and the matching groove 213 are rotationally matched. In this way, the base 110 can rotate relative to the mounting disc 200 around the first axis O. In addition, the matching of the matching protrusion 111 and the matching groove 213 can realize the radial positioning of the base 110. Therefore, the radial deviation of the base 110 relative to the mounting disc 200 can be effectively prevented, so as to avoid the decoupling of the base 110 and the driving magnetic head, thereby reducing the decoupling risk and improving the reliability of magnetic coupling. In addition, since the first wall portion 210 and the base 110 are only in contact through the matching protrusion 111 and the matching groove 213, compared with the way of providing a large number of protruding portions or providing an annular matching groove and matching protrusion, the contact area of the base 110 and the mounting disc 200 can be greatly reduced. In this way, the wear of the base 110 and the mounting disc 200 is reduced, and the service life of the base 110 and the mounting disc 200 is prolonged.

[0048] Specifically, as Figure 6As shown, in this embodiment, the mating protrusion 111 has a first curved surface 1110 with a radius of curvature of R1. The first curved surface 1110 is the lower end face of the mating protrusion 111. The mating groove 213 has a second curved surface 2130 that contacts the first curved surface 1110. The second curved surface 2130 is the inner surface of the mating groove 213. The radius of curvature of the second curved surface 2130 is R2, satisfying: 0.3 < R1 / R2 ≤ 1. This design improves the smoothness of base 110 rotation. Furthermore, the closer the R1 / R2 ratio is to 1, the smaller the difference in curvature between the two surfaces, resulting in a larger contact area between the first curved surface 1110 and the second curved surface 2130. This not only enhances the support stability of base 110 but also improves its radial limiting effect, further reducing the risk of decoupling. Conversely, a smaller R1 / R2 ratio results in a greater difference in curvature between the two surfaces, leading to a smaller contact area between the first curved surface 1110 and the second curved surface 2130. Therefore, an R1 / R2 ratio less than or equal to 0.3 leads to poor support stability and radial limiting effect on base 110, making decoupling more likely. Therefore, in this embodiment, the R1 / R2 ratio is between 0.3 and 1, thus improving the support stability of base 110 while reducing the risk of decoupling.

[0049] Preferably, in this embodiment, the projection of the mating groove 213 along the first axis O is circular, and the lower end surface of the mating protrusion 111 is hemispherical. This design can reduce the processing difficulty of the mating groove 213 and the mating protrusion 111.

[0050] like Figure 5 and Figure 6 As shown, in this embodiment, the axial thickness of the first wall portion 210 is H1. The mating protrusion 111 has an insertion section 1111 and an exposed section 1112. The insertion section 1111 is located in the mating groove 213, and the exposed section 1112 is located outside the mating groove 213. The axial length of the insertion section 1111 is L1, satisfying: 0.03 < L1 / H1 < 0.4. If L1 / H1 is less than or equal to 0.03, the axial length L1 of the insertion section 1111 is too small, which is prone to decoupling; if L1 / H1 is greater than or equal to 0.4, it will result in the thickness of the first wall portion 210 being too small, causing the first wall portion 210 to be prone to deformation. Therefore, in this embodiment, the ratio of L1 / H1 is between 0.03 and 0.4, which can reduce the risk of decoupling and avoid the first wall portion 210 being too thin and prone to deformation.

[0051] Furthermore, to further reduce the risk of decoupling, this embodiment also needs to satisfy: 0.03 < L1 / R1 < 0.45, 0.03 < L1 / R2 < 0.45. When L1 / R1 and L1 / R2 are larger, that is, when the axial insertion length L1 of the insertion segment 1111 is larger and the first curved surface 1110 and the second curved surface 2130 are more curved, it is more conducive to improving the radial limiting effect on the base 110 and reducing the contact area, and is more conducive to reducing the decoupling and wear between the two. However, if L1 / R1 and L1 / R2 are too large, it will cause the depth of the mating groove 213 to be too large, thereby causing a decrease in the mechanical strength of the first wall 210. If L1 / R1 and L1 / R2 are too small, it is easier to decouple. Therefore, when 0.03 < L1 / R1 < 0.45 and 0.03 < L1 / R2 < 0.45 are satisfied, the risk of decoupling can be reduced, the contact area can be effectively reduced, and the mechanical strength of the first wall portion 210 can be guaranteed.

[0052] In addition, such as Figure 1 , Figure 2 and Figure 5 As shown, the mounting plate 200 in this embodiment also includes a second wall 220 surrounding the first wall 210. The second wall 220 is integrally formed with the first wall 210 and fits to form a mounting groove 201. The base 110 is located inside the mounting groove 201, and the blade 120 is located outside the mounting groove 201. A first gap 001 exists between the inner circumferential side of the second wall 220 and the outer circumferential side of the base 110. With this design, the second wall 220 can further radially limit the base 110, preventing the base 110 from decoupling and becoming too radially offset and unable to return to its original position, thus ensuring that the base 110 can return to its original position even after decoupling.

[0053] The radial dimension of the first gap 001 is L2, and the distance between the edge of the groove 213 and the first axis O is L3, satisfying: 0.05 < L2 / L3 < 1.85. This design further limits the radial deviation of the base 110 from the first axis O. If L2 / L3 is greater than or equal to 1.85, the base 110 will be unable to return to its original position due to excessive deviation, thereby improving the reliability of the magnetic coupling.

[0054] The mounting plate 200 in this embodiment also includes a peripheral portion 230, which surrounds the outside of the first wall portion 210 and is connected to the first wall portion 210. The peripheral portion 230 is welded to the bag body. The peripheral portion 230 is bent radially outward in a direction away from the blade 120. The peripheral portion 230 includes an inner end 231 located near the first axis O and an outer end 232 located away from the first axis O. Because an axial magnetic driving force is generated between the base 110 and the drive head, this axial magnetic driving force drives the mounting plate 200 to move axially toward the drive head. Furthermore, during the assembly of the mounting plate 200 with the can body, the peripheral portion 230 is subjected to a pressing force in the same direction as the axial magnetic driving force. Therefore, if the peripheral portion 230 is set flat, it is not easy to deform or the deformation is small. Thus, under the action of the pressing force and the axial magnetic driving force, the peripheral portion 230 cannot offset most of the axial magnetic driving force and pressing force through its own deformation. This results in most of the pressing force and axial magnetic driving force being transmitted to the outer end 232 of the peripheral portion 230, causing the peripheral portion... The outer end 232 of 230 curves upwards, causing cracks and damage at the weld joint with the bag body and interference with the blade 120. In this solution, by setting a curved peripheral part 230, the deformation capacity of the peripheral part 230 can be increased, so that the peripheral part 230 can undergo greater deformation in the direction of the blade 120 after being subjected to external force (the sum of axial magnetic driving force and pressing force) to offset the greater external force, thereby reducing the external force transmitted to the outer end 232 of the peripheral part, making the force on the outer end 232 of the peripheral part smaller, thereby reducing the influence of external force and avoiding the outer end 232 of the peripheral part 230 from curving upwards and cracking and damaging at the weld joint with the bag body and interfering with the blade 120.

[0055] Specifically, the peripheral portion 230 is connected to the top end of the second wall portion 220. The outer end 232 of the peripheral portion 230 extends radially outward while gradually moving away from the blade 120, so that the peripheral portion 230 is integrally inclined in one section, or the peripheral portion 230 has an arc-shaped structure, thereby simplifying the structure of the peripheral portion 230 and facilitating its processing and forming. When the first wall portion 210 is subjected to an axial magnetic driving force, the axial magnetic driving force is transmitted to the peripheral portion 230 through the second wall portion 220.

[0056] The distance between the top surface of the inner end 231 and the bottom surface of the outer end 232 is S1, and the distance between the top surface of the inner end and the outer surface 212 is S2, satisfying: 0.05 < S1 / S2 < 0.35. If the S1 / S2 ratio is less than or equal to 0.05, the peripheral portion 230 tends to bend less in the direction away from the blade 120. When the peripheral portion 230 is subjected to external force (the sum of axial magnetic driving force and pressing force), it is less likely to arch or deform in the direction of the blade 120, resulting in a smaller degree of deformation. This makes it easier for the outer end 232 of the peripheral portion 230 to curl upwards, thereby reducing the strength of the weld between the peripheral portion 230 and the bag body. If the S1 / S2 ratio is greater than or equal to 0.35, the peripheral portion 230 tends to bend more in the direction away from the blade 120. When the bag body is uneven, the peripheral portion 230 is likely to interfere with the bag body and cause damage. In this embodiment, S1 / S2 is between 0.05 and 0.35. This design ensures the strength of the weld between the peripheral portion 230 and the bag body while preventing the peripheral portion 230 from interfering with the bag body.

[0057] Preferably, the mounting plate 200 in this embodiment further includes a reinforcing portion 240, which surrounds the second wall portion 220 and connects the peripheral portion 230 to the top of the second wall portion 220. The plane of the reinforcing portion 240 is perpendicular to the first axis O. This design increases the transmission distance of the axial magnetic driving force to the peripheral portion 230, thereby increasing the loss of force during transmission and reducing the force on the peripheral portion 230. This allows the peripheral portion 230 to withstand external forces with only a small deformation, further preventing the weld joint between the outer end 232 of the peripheral portion 230 and the bag body from cracking due to upward tilting.

[0058] In this embodiment, the radial length of the peripheral portion 230 is W1, and the radial length of the reinforcing portion 240 is W2, satisfying: 0.25 < W1 / W2 < 0.5. With this design, if W1 / W2 is less than or equal to 0.25, the radial length W1 of the curved peripheral portion 230 is too small, and the radial length W2 of the straight reinforcing portion 240 is too large. This results in the peripheral portion 230 having too little or no bending deformation, causing problems with the welding of the peripheral portion 230 to the bag body. The stability of the welded portion decreases; if W1 / W2 is greater than or equal to 0.5, the radial length W1 of the curved peripheral portion 230 is too large and the radial length W2 of the straight reinforcing portion 240 is too small, resulting in a small force transmission distance from the second wall portion 220 to the peripheral portion 230, and less loss during force transmission. This leads to increased stress on the peripheral portion 230, causing excessive deformation of the peripheral portion 230 towards the blade 120, resulting in cracking at the weld between its outer end 232 and the bag body. In this embodiment, by keeping W1 / W2 between 0.25 and 0.5, the force transmission distance can be effectively increased, and the degree of bending of the peripheral portion 230 towards the blade 120 can be reduced, thereby ensuring the stability of the weld between the peripheral portion 230 and the bag body.

[0059] Furthermore, the weld between the peripheral portion 230 and the reinforcing portion 240 can be further strengthened by limiting the included angle θ between the peripheral portion 230 and the reinforcing portion 240. This is because if the angle θ is too small or too large, it will be difficult for the peripheral portion 230 to eliminate the influence of the axial magnetic driving force by bending and deforming towards the blade 120. This will cause the weld between the peripheral portion 230 and the bag body to crack. Therefore, in this embodiment, it is necessary to satisfy: 0 < θ < 20°. By reasonably setting the range of θ, it is possible to further facilitate the peripheral portion 230 to eliminate the axial magnetic driving force by bending and deforming towards the blade 120, thereby ensuring the weld between the peripheral portion 230 and the bag body.

[0060] like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the base 110 in this embodiment also includes a magnetic component 130 that is magnetically coupled to the drive magnetic head. The base 110 has a groove 112 located at the center of the base 110 and a receiving cavity 113 surrounding the outside of the groove 112. The magnetic component 130 is installed in the receiving cavity 113 and is circumferentially fixed relative to the receiving cavity 113. The mating protrusion 111 is a mating post located in the groove 112. By setting the groove 112, not only can the weight of the stirring paddle 100 be reduced, but a circulation space is also formed to circulate the accumulated material inside.

[0061] To facilitate the discharge of accumulated material from the groove 112, this embodiment provides multiple circumferentially spaced and axially extending stirring ribs 114 on the outer periphery of the mating column. A second gap 002 exists between the stirring ribs 114 and the inner periphery of the groove 112. This design enhances the stirring effect on the accumulated material in the groove 112 by providing the stirring ribs 114, thereby facilitating the discharge of the accumulated material from the groove 112. At the same time, the design of the stirring ribs 114 also increases the structural strength of the mating column.

[0062] To facilitate the installation of the magnetic component 130 within the receiving cavity 113, the base 110 in this embodiment includes a housing 1101 and a cover plate 1102. The housing 1101 includes an integrally formed inner ring wall and an outer ring wall. The inner ring wall and the outer ring wall are connected near the upper ends of the blade 120 via a top plate. The inner ring wall, the outer ring wall, and the top plate form a receiving groove with an open lower end. The top plate forms the bottom wall of the receiving groove, and the inner ring wall forms the side wall of the groove 112. A welding part 1131 is provided at the opening of the receiving groove. The cover plate 1102 and... The welding part 1131 is welded to close the opening of the receiving groove. The magnetic component 130 is installed in the receiving cavity 113 formed by the receiving groove and the cover plate 1102. In this embodiment, the magnetic component 130 is a magnetic ring or includes multiple circumferentially distributed arc-shaped magnets. A limiting part 140 is provided between the receiving cavity 113 and the magnetic component 130 to restrict the relative circumferential rotation between the two. This design not only facilitates the installation and fixation of the magnetic component 130, but also avoids the magnetic component 130 from rotating circumferentially and failing to magnetically couple with the drive magnetic head.

[0063] In this embodiment, the limiting part 140 includes a limiting protrusion 141 on the cover plate 1102 and a limiting recess 142 on the magnetic component 130. The limiting protrusion 141 extends toward the bottom wall of the receiving groove, and the limiting protrusion 141 and the limiting recess 142 are inserted into each other, so that the magnetic component 130 can be circumferentially fixed relative to the receiving cavity 113.

[0064] In this embodiment, the magnetic component 130 rotates under the magnetic field of the driving magnetic head. When the magnetic component 130 rotates, it drives the cover plate 1102 to rotate through the cooperation of the limiting protrusion 141 and the limiting recess 142, thereby realizing the synchronous rotation of the driving housing 1101 and the blade 120. That is, the magnetic component 130 applies a circumferential rotational force to the cover plate 1102 through the limiting protrusion 141. In this embodiment, the radial distance H3 between the limiting protrusion 141 and the welding part 1131 is not less than 10mm. This design can increase the force transmission distance between the welding part 1131 and the limiting protrusion 141, thereby increasing the loss of force in the transmission process, reducing the circumferential rotational force on the welding part 1131, and thus effectively preventing the welding part 1131 from cracking.

[0065] Finally, to prevent axial movement of the magnetic component 130, in this embodiment, an elastic element (not shown in the figure) is provided on the side of the cover plate 1102 near the magnetic component 130. The elastic element is a silicone pad, a rubber pad, or a spring. The elastic element abuts against the magnetic component 130. With this design, the axial positioning reliability of the magnetic component 130 can be improved while reducing the processing accuracy requirements, thus preventing axial movement of the magnetic component 130 and ensuring the reliability of magnetic coupling.

[0066] It is understood that in other embodiments of this utility model, the base is provided with a mating groove located at the first axis, and the inner surface is provided with a mating protrusion inserted into the mating groove along the first axis. The shape of the mating protrusion and the mating groove can be set with reference to the above embodiments. The first wall portion and the base only make unique contact and rotate with each other through the mating protrusion and the mating groove.

[0067] It is understood that in other embodiments of this utility model, the inner end of the peripheral portion can be directly connected to the top end of the second wall portion.

[0068] Example 2

[0069] like Figure 7 As shown, compared with Embodiment 1, the difference in this embodiment is that the limiting part 140 is disposed between the bottom wall of the receiving groove and the magnetic component 130. That is, the limiting part 140 includes a limiting protrusion 141 disposed on the bottom wall of the receiving groove and a limiting recess 142 disposed on the magnetic component 130. The limiting protrusion 141 extends toward the groove opening of the receiving groove, and the limiting protrusion 141 and the limiting recess 142 are inserted and matched. With this design, the magnetic component 130 can also be circumferentially fixed relative to the receiving cavity 113.

[0070] In this embodiment, the axial distance H2 between the limiting protrusion 141 and the welding part 1131 is not less than 10mm. This is because when the magnetic component 130 rotates, it drives the housing 1101 to rotate through the cooperation of the limiting recess 142 and the limiting protrusion 141, thereby driving the cover plate 1102 and the blade 120 to rotate synchronously. That is, the magnetic component 130 transmits circumferential rotational force to the welding part 1131 through the bottom wall of the receiving groove via the limiting protrusion 141, and then through the inner ring wall or the outer ring wall. Therefore, in this embodiment, H2 is limited to not less than 10mm, which can increase the force transmission distance between the welding part 1131 and the limiting part 140, thereby increasing the loss of force in the transmission process, reducing the circumferential rotational force on the welding part 1131, and thus effectively preventing the welding part 1131 from cracking.

[0071] Preferably, there is an axial gap between the inner bottom of the limiting recess 142 and the end of the limiting protrusion 141. This design ensures that the limiting protrusion 141 is completely located within the limiting recess 142, thereby improving the circumferential limiting reliability of the magnetic component 130. In addition, the presence of the axial gap also reduces the dimensional machining accuracy requirements of the limiting recess 142 and the limiting protrusion 141 in the axial direction.

[0072] Example 3

[0073] like Figure 8 As shown, compared with Embodiments 1 and 2, the difference in this embodiment is that the peripheral portion 230 includes multiple inclined segments 233 connected sequentially in a direction away from the blade 120. Each inclined segment 233 is radially outward and inclined away from the blade, and the inclination angle of the multiple inclined segments 233 gradually increases in the direction away from the blade 120, that is, the included angle θ between each inclined segment 233 and the reinforcing portion 240 gradually increases in the direction away from the blade 120. This design increases the curvature of the peripheral portion 230 and also makes it easier for it to arch and deform in the direction of the blade 120 to eliminate the influence of the axial magnetic driving force. This avoids the outer end of the peripheral portion 230 from axially moving relative to the bag body, thereby further preventing the outer end of the peripheral portion 230 from shifting and cracking at the weld with the bag body.

[0074] Example 4

[0075] like Figure 9 As shown, the difference between this embodiment and embodiments one to three is that the inner end 231 of the peripheral portion 230 is directly connected to the edge of the first wall portion 210.

[0076] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A magnetic stirring bag, comprising: Bag body; A mixing impeller, including a base and blades mounted on the base; The mounting plate includes a first wall portion having an inner surface and an outer surface, the base being supported on the inner surface, and a drive magnetic head disposed outside the magnetic stirring bag on one side of the outer surface. The base and the drive magnetic head are magnetically coupled, and the base is rotatable relative to the mounting plate about a first axis. The feature is that one of the inner surface and the base is provided with a mating groove located at the first axis, and the other is provided with a mating protrusion inserted into the mating groove along the first axis. The first wall portion and the base only make unique contact with the mating groove through the mating protrusion and rotate to engage.

2. The magnetic stirring bag as described in claim 1, characterized in that, The mating protrusion has a first curved surface, and the mating groove has a second curved surface that contacts the first curved surface. The radius of curvature of the first curved surface is R1, and the radius of curvature of the second curved surface is R2, satisfying: 0.3 < R1 / R2 ≤ 1.

3. A magnetic stirring bag as described in claim 2, characterized in that, The mating protrusion has an insertion section located in the mating groove and an exposed section located outside the mating groove. The axial length of the insertion section is L1, which satisfies: 0.03 < L1 / R1 < 0.45, 0.03 < L1 / R2 < 0.

45.

4. A magnetic stirring bag as described in claim 1, characterized in that, The axial thickness of the first wall portion is H1, and the mating protrusion has an insertion section located in the mating groove and an exposed section located outside the mating groove. The axial length of the insertion section is L1, which satisfies: 0.03 < L1 / H1 < 0.

4.

5. A magnetic stirring bag as described in claim 1, characterized in that, The mounting plate also includes a second wall portion disposed around the first wall portion, the second wall portion and the first wall portion cooperating to form a mounting groove, the base being located in the mounting groove, and a first gap existing between the inner peripheral side of the second wall portion and the outer peripheral side of the base.

6. A magnetic stirring bag as described in claim 5, characterized in that, The radial dimension of the first gap is L2, and the distance between the edge of the groove and the first axis is L3, satisfying: 0.05 < L2 / L3 < 1.

85.

7. A magnetic stirring bag as described in claim 1, characterized in that, The mounting plate also includes a peripheral portion connected to the first wall portion and surrounding the outside of the first wall portion, the peripheral portion being welded to the bag body, and the peripheral portion being bent radially outward in a direction away from the blade.

8. A magnetic stirring bag as described in claim 7, characterized in that, The peripheral portion includes multiple inclined segments connected in sequence in the direction away from the blade. Each inclined segment is radially outward in the direction away from the blade, and the inclination angle of the multiple inclined segments gradually increases in the direction away from the blade.

9. A magnetic stirring bag as described in claim 7, characterized in that, The mounting plate also includes a second wall portion surrounding the first wall portion. The second wall portion and the first wall portion cooperate to form a mounting groove. The base is rotatably mounted in the mounting groove. There is a first gap between the second wall portion and the outer periphery of the base. The peripheral portion is connected to the top end of the second wall portion. The peripheral portion includes an inner end located near the first axis and an outer end located away from the first axis. The distance between the top surface of the inner end and the bottom surface of the outer end is S1, and the distance between the top surface of the inner end and the outer surface of the first wall portion is S2, satisfying: 0.05 < S1 / S2 < 0.

35.

10. A magnetic stirring bag as described in claim 9, characterized in that, The mounting plate also includes a reinforcing portion surrounding the second wall portion, the reinforcing portion connecting the peripheral portion and the top of the second wall portion, and the plane of the reinforcing portion being perpendicular to the first axis.

11. A magnetic stirring bag as described in claim 10, characterized in that, The radial length of the peripheral portion is W1, and the radial length of the reinforcing portion is W2, satisfying: 0.25 < W1 / W2 < 0.5; And / or the peripheral portion and the reinforcing portion have an included angle θ, satisfying 0 < θ < 20°.

12. A magnetic stirring bag as described in any one of claims 1 to 11, characterized in that, The base includes a magnetic component that is magnetically coupled to the drive head. The base has a groove at the center of the base and a receiving cavity surrounding the outside of the groove. The magnetic component is installed in the receiving cavity. The mating protrusion is a mating post located in the groove.

13. A magnetic stirring bag as described in claim 12, characterized in that, The outer periphery of the mating column is provided with a plurality of circumferentially spaced and axially extended stirring ribs, and there is a second gap between the stirring ribs and the inner periphery of the groove.

14. A magnetic stirring bag as described in claim 12, characterized in that, The base includes a housing with a receiving groove and a cover plate for closing the opening of the receiving groove. The opening of the receiving groove is provided with a welding part that is welded to the cover plate. The magnetic component is installed in a receiving cavity formed by the receiving groove and the cover plate. A limiting part is provided between the receiving cavity and the magnetic component to restrict the two from rotating relative to each other in the circumferential direction. The limiting part is located between the bottom wall of the receiving groove and the magnetic component, and the axial distance H2 between the limiting part and the welding part is not less than 10mm; And / or, The limiting part includes a limiting protrusion on the bottom wall of the receiving groove and a limiting recess on the magnetic component. The limiting protrusion and the limiting recess are inserted into each other. The limiting protrusion extends toward the opening of the receiving groove, and there is an axial gap between the inner bottom of the limiting recess and the end of the limiting protrusion. And / or, The cover plate has an elastic element on the side near the magnetic element, and the elastic element abuts against the magnetic element.

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