Rotor sheath injection molding device, system and method and rotor

Abstract

The invention provides a rotor sheath injection molding device, system and method and a rotor. The rotor sheath injection molding device comprises an injection molding assembly and a rotor sheath. Wherein the rotor sheath is of a tubular structure, the two ends of the rotor sheath are open, and the rotor sheath is used for completely wrapping the periphery of the rotor assembly; the injection molding assembly is located at one end of the rotor sheath; the injection molding assembly is used for injecting an injection molding material into a gap between the rotor sheath and the rotor assembly, so that the rotor sheath and the rotor assembly are fixed; the rotor sheath is formed on the periphery of the rotor assembly through injection molding, so that the problem that the motor performance is affected by increasing the rotor strength by increasing the size of an iron core magnetic bridge in the prior art is solved on the basis of effectively improving the rotor strength.

Description

Technical Field

[0001] The present invention relates to the field of permanent magnet motors, in particular to a rotor core, and specifically to a rotor sheath injection molding device, system, method and rotor. Background Art

[0002] The speed of permanent magnet motors is getting higher and higher, and some have exceeded 20,000 rpm (the full English name: revolutions per minute, translated into Chinese as: revolutions per minute). The rotor of the permanent magnet motor will generate huge centrifugal force under continuous high speed, which will cause the rotor core to have hidden dangers such as displacement, expansion, and disintegration. At the same time, when the rotor is running at high speed, the centrifugal force generated will cause the permanent magnet to face greater tensile stress and the risk of being thrown out.

[0003] At present, the centrifugal force generated by the high speed of the rotor is often suppressed by increasing the rotor strength. The existing method to increase the rotor strength is to increase the size of the iron core magnetic bridge. Increasing the size of the iron core magnetic bridge can increase the mechanical strength of the rotor, but it will cause uneven magnetic field in the rotor air gap, thereby affecting the performance of the permanent magnet motor, or affect the overall weight and size of the permanent magnet motor. Summary of the Invention

[0004] The object of the present invention is to provide a rotor sheath injection molding device, system, method and rotor, so as to solve the problems pointed out in the above background technology.

[0005] In a first aspect, the present invention provides a rotor sleeve injection molding device, comprising: an injection molding component and a rotor sleeve; wherein the rotor sleeve is a tubular structure with both ends of the rotor sleeve open, and the rotor sleeve is used to completely cover the outer circumference of the rotor assembly; the injection molding component is located at one end of the rotor sleeve; the injection molding component is used to inject injection molding material into the gap between the rotor sleeve and the rotor assembly to fix the rotor sleeve to the rotor assembly.

[0006] The present invention provides a novel method for increasing the strength of the rotor, namely, forming a rotor sleeve by injection molding on the outer periphery of the rotor assembly. On the basis of effectively improving the rotor strength, it solves the problem in the prior art that increasing the rotor strength by increasing the size of the iron core magnetic bridge affects the performance of the motor.

[0007] In an implementation of the first aspect, the gap between the rotor sleeve and the rotor assembly includes at least a uniform gap between an inner ring of the rotor sleeve and an outer periphery of the rotor assembly.

[0008] In this implementation, the rotor strength is further improved by injecting the injection molding material into the uniform gap between the inner ring of the rotor sleeve and the outer periphery of the rotor assembly.

[0009] In an implementation of the first aspect, the rotor sleeve injection molding device further includes: a tooling pallet; the tooling pallet is arranged at the other end of the rotor sleeve, a positioning shaft is provided on the tooling pallet, and the tooling pallet is used to place the rotor assembly; the center axis of the positioning shaft is consistent with the center axis of the rotor sleeve; when the rotor assembly is arranged on the tooling pallet, the center axis hole of the rotor assembly is sleeved on the positioning shaft.

[0010] In this implementation, the design of the positioning shaft plays a role in positioning the rotor assembly, which facilitates the quick and efficient installation of the rotor assembly on the tooling pallet. Moreover, since the center axis of the positioning shaft is consistent with the center axis of the rotor sleeve, the center axis of the rotor sleeve is consistent with the center axis of the rotor assembly, thereby ensuring that the gap between the rotor sleeve and the rotor assembly is uniform.

[0011] In an implementation of the first aspect, the positioning shaft is used to be cooperatively connected with the central shaft hole.

[0012] In this implementation, a connection method for the positioning shaft and the central shaft hole is provided, and a stable connection between the rotor assembly and the positioning shaft is achieved through the cooperative connection between the two.

[0013] In an implementation of the first aspect, a first annular groove is further provided on the tooling pallet; when the rotor assembly is provided on the tooling pallet, the first annular groove is located on the outer ring of the contact end surface of the rotor assembly and the tooling pallet; the central axis of the first annular groove is consistent with the central axis of the rotor sleeve, and a first sealing ring is provided in the first annular groove; the other end of the rotor sleeve is in contact with the first sealing ring.

[0014] In this implementation, the design of the first sealing ring effectively prevents the rotor sleeve from rupturing and causing glue overflow during injection molding due to excessive pressure during injection molding.

[0015] In an implementation of the first aspect, a thickness of the first sealing ring is less than or equal to a height of the first annular groove along the positioning axis.

[0016] In this implementation, when the thickness of the first sealing ring is less than the height of the first annular groove along the positioning axis, the other end of the rotor sleeve can extend to the outside of the corresponding end of the rotor assembly, thereby effectively ensuring that the rotor sleeve can completely cover the outer periphery of the rotor assembly.

[0017] In an implementation of the first aspect, the rotor sleeve injection molding device further includes: a fixing component; the fixing component is formed with a fixing sleeve hole; the fixing sleeve hole is sleeved on the outer circumference of the rotor sleeve, and the diameter of the fixing sleeve hole is equal to the outer diameter of the rotor sleeve.

[0018] In this implementation, the rotor sleeve is fixed by setting a fixing component, which effectively prevents the outer diameter of the rotor assembly from becoming larger and the rotor sleeve from cracking due to high injection pressure during the injection molding process. At the same time, it also ensures the roundness, cylindricity and concentricity of the rotor assembly after injection molding.

[0019] In an implementation of the first aspect, the injection molding assembly includes, from one end away from the rotor sleeve to the end close to the rotor sleeve, in sequence: a glue feed plate, a diverter plate and a runner plate; the glue feed plate, the diverter plate and the runner plate are connected; wherein, the glue feed plate is provided with a glue feed hole; a plurality of diverter branches are distributed on the diverter plate; a plurality of groups of reserved injection molding holes are distributed on the runner plate; the reserved injection molding holes correspond to the gap positions between the rotor sleeve and the rotor assembly, and each group of the reserved injection molding holes corresponds to one of the diverter branches; during injection molding, the end face of the runner plate away from the diverter plate is used to contact the rotor assembly, and the injection molding material enters the gap between the rotor sleeve and the rotor assembly in sequence through the glue feed hole, the plurality of diverter branches and the plurality of groups of the reserved injection molding holes.

[0020] In this implementation, the structural design of the glue inlet plate, diverter plate and runner plate ensures that the injection material can be evenly injected into the uniform gap between the rotor sleeve and the rotor assembly, thereby effectively ensuring the injection molding effect; at the same time, the setting of multiple diverter branches and multiple groups of reserved injection holes also significantly improves the injection molding efficiency, thereby improving the production cycle and reducing the waiting time of the previous and next processes.

[0021] In an implementation of the first aspect, the plurality of diversion branches are evenly distributed on the diversion plate, and the plurality of diversion branches are symmetrically distributed about the glue inlet hole; multiple groups of the reserved injection holes are evenly distributed on the flow channel plate; and the injection material evenly enters the gap between the rotor sleeve and the rotor assembly.

[0022] In this implementation, the evenly distributed branch channels and reserved injection holes effectively ensure that the injection material evenly enters the gap between the rotor sleeve and the rotor assembly, thereby improving the injection molding efficiency while ensuring the injection molding effect.

[0023] In an implementation of the first aspect, a positioning protrusion is provided on the end surface of the flow channel plate away from the diverter plate; the positioning protrusion is used to cooperate with the positioning hole of the rotor assembly.

[0024] In the present implementation, the positioning protrusion is arranged in combination with the positioning hole, thereby playing a positioning role on the runner plate (or the injection molding assembly), and the runner plate and the rotor assembly can be quickly and efficiently connected, and the relative stability between the runner plate and the rotor assembly is ensured, and rotation and shaking of the runner plate relative to the rotor assembly are avoided.

[0025] In an implementation form of the first aspect, the runner plate is provided with a second annular groove on the end face away from the flow distribution plate; when the end face of the runner plate away from the flow distribution plate contacts the rotor assembly, the second annular groove is located at the outer circle of the contact end face of the runner plate and the rotor assembly; the center axis of the second annular groove is consistent with the center axis of the rotor sleeve, and a second sealing ring is arranged in the second annular groove; one end of the rotor sleeve contacts the second sealing ring.

[0026] In the present implementation, the design of the second sealing ring effectively prevents the rotor sleeve from being broken due to too much pressure during injection molding, thereby preventing overflow of the injection molding glue.

[0027] In an implementation form of the first aspect, the thickness of the second sealing ring is less than or equal to the height of the second annular groove in the direction of the center axis of the rotor sleeve.

[0028] In the present implementation, when the thickness of the second sealing ring is less than the height of the second annular groove in the direction of the center axis of the rotor sleeve, one end of the rotor sleeve can extend to the outside of the corresponding end of the rotor assembly, thereby effectively ensuring that the rotor sleeve can completely cover the outer periphery of the rotor assembly.

[0029] In a second aspect, the present application provides a rotor sleeve injection molding system, which comprises a rotor assembly and the rotor sleeve injection molding device described above; wherein the rotor assembly comprises a rotor core formed by sequentially stacking a plurality of silicon steel sheets and a magnetic steel; the outer periphery of the silicon steel sheet is located on the circumference of a same target circle, and a plurality of groups of magnetic steel grooves are distributed on the silicon steel sheet in the circumferential direction of the target circle; the magnetic steel is inserted into the magnetic steel groove; the rotor sleeve of the rotor sleeve injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sleeve completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sleeve is greater than the outer diameter of the rotor core; the injection molding assembly of the rotor sleeve injection molding device injects injection molding material into the gap between the rotor core and the rotor sleeve, so as to fix the rotor sleeve and the rotor core.

[0030] In the present invention, a gap is created between the rotor core and the rotor sleeve so that during injection molding, the rotor core and the rotor sleeve can be fixed by injecting molding material into the gap. In addition, by designing the inner diameter of the rotor sleeve to be larger than the outer diameter of the rotor core, the rotor sleeve can be sleeved on the outer periphery of the rotor core while ensuring the normal progress of injection molding. Moreover, by injecting more molding material between the two, the strength of the rotor assembly after injection molding is further increased.

[0031] In an implementation of the second aspect, at least a portion of the magnetic steel slots corresponding to ends of the target circle extend to the target circle.

[0032] In an implementation of the second aspect, there is a gap between at least part of the magnetic steel in the target magnetic steel slot corresponding to the end of the target circle circumference and the corresponding end of the target magnetic steel slot; the target magnetic steel slot is a magnetic steel slot corresponding to the end of the target circle circumference and extending to the target circle circumference; injection molding material is injected into the gap between the end of the magnetic steel in the target magnetic steel slot corresponding to the target circle circumference and the corresponding end of the target magnetic steel slot through the injection molding component to fix the magnetic steel to the rotor sleeve.

[0033] In this implementation, a gap is created between the end of at least part of the target circle of the magnetic steel in the target magnetic steel slot and the end of the corresponding target magnetic steel slot, so that injection molding material is injected into the gap through the injection molding component, thereby enabling the magnetic steel and the rotor sleeve to be fixed.

[0034] In an implementation of the second aspect, there is a gap between one end and / or the other end of at least part of the magnetic steel and the end of the corresponding magnetic steel slot; injection molding material is injected into the gap between one end and / or the other end of the magnetic steel and the end of the corresponding magnetic steel slot through the injection molding component to fix the rotor core to the magnetic steel.

[0035] In this implementation, a gap is created between one end and / or the other end of at least part of the magnetic steel and the end of the corresponding magnetic steel slot, and injection molding material is injected into the gap through the injection molding component, thereby enabling the rotor core and the magnetic steel to be fixed.

[0036] In an implementation of the second aspect, a plurality of groups of magnetic steel slots are evenly distributed on the silicon steel sheet, and the magnetic steel slots and the magnetic steel are radially symmetrical about the target circle.

[0037] In this implementation, by designing multiple groups of magnetic steel slots to be evenly distributed along the circumferential direction of the target circle, and making the magnets and the magnetic steel slots radially symmetrical about the target circle, the stability and reliability of the overall structure of the rotor sleeve and the rotor assembly, as well as the strength of the rotor assembly are ensured after the injection molding is completed.

[0038] In an implementation of the second aspect, each group of the magnetic steel slots includes n open slots; n ≥ 1; when n ≥ 2, the n open slots are spaced apart along the radial direction of the target circle; each of the open slots includes a first separation slot and a second separation slot; the first separation slot and the second separation slot are independent of each other, and the first separation slot and the second separation slot are separated by a preset distance; the magnetic steel includes a first magnetic steel block and a second magnetic steel block; wherein the first magnetic steel block is inserted into the first separation slot, and the second magnetic steel block is inserted into the second separation slot.

[0039] In an implementation of the second aspect, the first dividing groove and the second dividing groove are radially symmetrical about the target circle, and an end of the first dividing groove away from the second dividing groove and an end of the second dividing groove away from the first dividing groove both extend to the circumference of the target circle; the first magnetic steel block and the second magnetic steel block are radially symmetrical about the target circle.

[0040] In an implementation of the second aspect, a height of the rotor sleeve is greater than or equal to a height of the rotor core.

[0041] In this implementation, by designing the height of the rotor sheath to be greater than or equal to the height of the rotor core, it is ensured that the rotor sheath can completely cover the outer circumference of the rotor core.

[0042] In a third aspect, the present invention provides a rotor sleeve injection molding method implemented based on the above-mentioned rotor sleeve injection molding device, the rotor sleeve injection molding method comprising: obtaining the height of the rotor assembly; obtaining the rotor sleeve according to the height; using the rotor sleeve to completely cover the outer periphery of the rotor assembly; positioning the injection molding assembly at one end of the rotor assembly; injecting molding material into the gap between the rotor sleeve and the rotor assembly through the injection molding assembly to fix the rotor sleeve to the rotor assembly; and after the injection molding is completed, removing the injection molding assembly from the rotor assembly.

[0043] In a fourth aspect, the present invention provides a rotor manufactured based on the above-mentioned rotor sleeve injection molding method, wherein the rotor comprises: a rotor assembly and a rotor sleeve, and an injection molding layer formed by injection molding material; the injection molding layer is located in the gap between the rotor sleeve and the rotor assembly, so that the rotor sleeve and the rotor assembly are fixed through the injection molding layer.

[0044] As described above, the rotor sheath injection molding device, system, method, and rotor of the present invention have the following beneficial effects:

[0045] (1) Compared with the prior art, the present invention provides a novel method for increasing the strength of the rotor. By forming a rotor sleeve on the periphery of the rotor assembly through injection molding, the strength of the rotor assembly is improved, which effectively solves the problem in the prior art that the rotor strength is increased by increasing the size of the iron core magnetic bridge, which affects the performance of the motor.

[0046] (2) The present invention not only improves the strength of the rotor assembly by forming a rotor sleeve on the outer periphery of the rotor assembly, but also further enhances the strength of the rotor assembly by injecting injection molding material between the rotor sleeve and the rotor assembly, thereby better suppressing the centrifugal force generated by the high speed of the rotor.

[0047] (3) The mass production process of the rotor sleeve injection molding method provided by the present invention is simple. On the basis of the original production line, almost no new production line equipment needs to be added to realize the mass production of the rotor sleeve formed by injection molding on the rotor assembly, which reduces equipment investment and has high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 Shown is a schematic structural diagram of the rotor sleeve according to an embodiment of the present invention.

[0049] Figure 2 Shown is a schematic structural diagram of a rotor assembly according to an embodiment of the present invention.

[0050] Figure 3 It is a schematic structural diagram showing a rotor sleeve covering the outer periphery of a rotor assembly according to an embodiment of the present invention.

[0051] Figure 4 The figure shows a top view of a rotor sleeve covering the outer circumference of a rotor assembly according to an embodiment of the present invention.

[0052] Figure 5 Shown is a schematic structural diagram of a tooling pallet according to an embodiment of the present invention.

[0053] Figure 6 Shown is a schematic structural diagram of a fixing assembly according to an embodiment of the present invention.

[0054] Figure 7 It is a schematic structural diagram showing that the fixing assembly according to an embodiment of the present invention is sleeved on the outer circumference of the rotor sleeve.

[0055] Figure 8 Shown is a structural schematic diagram of the glue feeding plate according to an embodiment of the present invention.

[0056] Figure 9 Shown is a structural schematic diagram of the diverter plate according to an embodiment of the present invention.

[0057] Figure 10 Shown is a schematic structural diagram of the flow channel plate according to an embodiment of the present invention.

[0058] Figure 11 Shown is a schematic structural diagram of the injection molding component according to an embodiment of the present invention.

[0059] Figure 12 Shown is a schematic structural diagram of the rotor sleeve injection molding device according to an embodiment of the present invention during the injection molding process.

[0060] Figure 13 Shown is a schematic structural diagram of a rotor according to an embodiment of the present invention.

[0061] Figure 14 Shown is a flow chart of a rotor sleeve injection molding method according to an embodiment of the present invention.

[0062] Figure 15 Shown is a schematic diagram of a target circle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0064] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0065] See Figures 1 to 15. The following embodiments of the present invention provide a rotor sleeve injection molding device, system, method and rotor. Compared with the prior art, the present invention provides a new method for increasing the strength of the rotor, which improves the strength of the rotor assembly by forming a rotor sleeve by injection molding on the periphery of the rotor assembly, and effectively solves the problem in the prior art that the rotor strength is increased by increasing the size of the iron core magnetic bridge, which affects the performance of the motor. The present invention not only improves the strength of the rotor assembly by forming a rotor sleeve on the periphery of the rotor assembly, but also further enhances the strength of the rotor assembly by injecting the injection molding material between the rotor sleeve and the rotor assembly, thereby better suppressing the centrifugal force generated by the high speed of the rotor. The rotor sleeve injection molding method provided by the present invention has a simple mass production process flow. On the basis of the original production line, the production line equipment almost does not need to be newly added to realize the mass production of rotor sleeves formed by injection molding on the rotor assembly, which reduces equipment investment and has high production efficiency.

[0066] The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0067] like Figure 3 、 Figure 11 and Figure 12 As shown, in one embodiment, the present invention provides a rotor sleeve injection molding device, which includes: an injection molding component 1 and a rotor sleeve 2.

[0068] like Figures 1 to 3 As shown, in this embodiment, the rotor sheath 2 is a tubular structure with both ends of the rotor sheath 2 open. The rotor sheath 2 is used to completely cover the outer circumference of the rotor assembly 3 .

[0069] like Figure 7 and Figure 12 As shown, the injection molding component 1 is located at one end of the rotor sleeve 2 (corresponding to Figure 7 The injection molding component 1 is used to inject the injection molding material into the gap between the rotor sleeve 2 and the rotor assembly 3 to fix the rotor sleeve 2 and the rotor assembly 3.

[0070] It should be noted that the injection molding component 1 is also located at one end of the rotor component 3 (such as Figure 2 and Figure 12 As shown, the injection molding component 1 is located at the upper end of the rotor component 3).

[0071] In one embodiment, the injection molding material is epoxy thermosetting molding material.

[0072] In one embodiment, the rotor sheath 2 is made of carbon fiber material.

[0073] In one embodiment, the injection molding component 1 contacts one end of the rotor component 3 .

[0074] It should be noted that during injection molding, the injection molding component 1 is brought into contact with one end of the rotor assembly 3 so that the injection molding component 1 is located at one end of the rotor sleeve 2 ; after the injection molding is completed, the injection molding component 1 is removed from the rotor assembly 3 .

[0075] In one embodiment, the injection molding component 1 is used to connect with one end of the rotor component 3 .

[0076] Specifically, if Figure 2 and Figure 12 As shown, the injection molding component 1 is connected to the upper end of the rotor component 3.

[0077] In one embodiment, the gap between the rotor sleeve 2 and the rotor assembly 3 includes at least but is not limited to: a uniform gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3 .

[0078] Specifically, by aligning the central axis of the rotor sleeve 2 and the central axis of the rotor assembly 3 on the same straight line, the gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3 is uniform, thereby ensuring the injection molding effect.

[0079] like Figure 4 and Figure 13 As shown, in one embodiment, the gap between the rotor sleeve 2 and the rotor assembly 3 includes not only the above-mentioned "uniform gap between the inner ring of the rotor sleeve 2 and the outer periphery of the rotor assembly 3", but also includes: the gaps between the two ends of the magnet 303 and the ends of the corresponding magnet slots 302.

[0080] like Figure 2 、 Figure 3 and Figure 5 As shown, in one embodiment, the rotor sleeve injection molding device further includes: a tooling tray 4.

[0081] Specifically, the tooling tray 4 is provided at the other end of the rotor sleeve 2 (corresponding to Figure 3 In the figure, at the lower end of the rotor sleeve 2), a positioning shaft 5 is provided on the tooling tray 4, and the tooling tray 4 is used to place the rotor assembly 3; the central axis of the positioning shaft 5 is consistent with the central axis of the rotor sleeve 2; when the rotor assembly 3 is arranged on the tooling tray 4, the central axis hole of the rotor assembly 3 is sleeved on the positioning shaft 5.

[0082] It should be noted that, before injection molding, the rotor assembly 3 is placed on the tooling tray 4; after injection molding is completed, the tooling tray is removed.

[0083] In one embodiment, the positioning shaft 5 is used to cooperate with the central shaft hole.

[0084] It should be noted that, through the mating connection between the positioning shaft 5 and the central shaft hole, the central shaft hole can ensure the relative stability between the rotor assembly 3 and the positioning shaft 5 when it is sleeved on the positioning shaft 5, thereby preventing the rotor assembly 3 from rotating and shaking relative to the positioning shaft 5.

[0085] like Figure 5 As shown, in one embodiment, the positioning shaft 5 is provided with a connecting groove 501 along the axial direction of its outer periphery, and a connecting protrusion (not shown in the figure) is provided inwardly of the central shaft hole, and the size of the connecting protrusion is the same as the size of the connecting groove 501.

[0086] Specifically, when the central shaft hole is sleeved on the positioning shaft 5, the connecting protrusion is correspondingly arranged in the connecting groove 501 to achieve a fitting connection between the connecting protrusion and the connecting groove 501, thereby achieving a stable connection between the rotor assembly 3 and the positioning shaft 5.

[0087] like Figure 5 As shown, in one embodiment, the number of the connecting grooves 501 is two, and the two connecting grooves 501 are symmetrically distributed with respect to the radial direction of the positioning shaft 5 .

[0088] In one embodiment, the diameter of the positioning shaft 5 is equal to the diameter of the central shaft hole, so that when the central shaft hole is sleeved on the positioning shaft 5, it can ensure that the rotor assembly 3 and the positioning shaft 5 are relatively stable, and prevent the rotor assembly 3 from rotating and shaking relative to the positioning shaft 5.

[0089] In one embodiment, a first annular groove 6 is further provided on the tooling tray 4 .

[0090] Specifically, when the rotor assembly 3 is arranged on the tooling pallet 4, the first annular groove 6 is located on the outer ring of the contact end surface of the rotor assembly 3 and the tooling pallet 4; the central axis of the first annular groove 6 is consistent with the central axis of the rotor sleeve 2, and a first sealing ring 7 is provided in the first annular groove 6; the other end of the rotor sleeve 2 is in contact with the first sealing ring 7.

[0091] It should be noted that, through the design of the first sealing ring 7, during the injection molding process, there is soft contact between the other end of the rotor sleeve 2 and the first sealing ring 7 (if there is no first sealing ring 7, the other end of the rotor sleeve 2 is in direct hard contact with the tooling tray 4), which effectively prevents the rotor sleeve from rupturing due to excessive pressure during injection molding and causing glue overflow.

[0092] In one embodiment, the first sealing ring 7 has an elastic deformation function, that is, during the injection molding process, the other end of the rotor sleeve 2 can be squeezed and deformed on the first sealing ring 7, while ensuring a good sealing effect. At the same time, the other end of the rotor sleeve 2 can be extended to the corresponding end of the rotor assembly 3 (corresponding to Figure 2 The outer side of the lower end of the middle rotor assembly 3) (corresponding to Figure 2 to ensure that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3.

[0093] In one embodiment, the thickness of the first sealing ring 7 is less than or equal to the height of the first annular groove 6 along the direction of the positioning axis 5 (e.g. Figure 5 As shown, the thickness of the corresponding first sealing ring 7 is smaller than the height of the first annular groove 6 along the direction of the positioning axis 5).

[0094] It should be noted that when the thickness of the first sealing ring 7 is less than the height of the first annular groove 6 along the direction of the positioning axis 5, the other end of the rotor sleeve 2 can extend to the outside of the corresponding end of the rotor assembly 3, thereby effectively ensuring that the rotor sleeve 2 can be completely covered on the outer periphery of the rotor assembly 3.

[0095] Similarly, when the thickness of the first sealing ring 7 is equal to the height of the first annular groove 6 along the direction of the positioning axis 5, since the first sealing ring 7 has an elastic deformation function, the other end of the rotor sleeve 2 can also be extended to the outside of the corresponding end of the rotor assembly 3 (by squeezing the first sealing ring 7 by the other end of the rotor sleeve 2 to cause it to undergo elastic deformation), thereby effectively ensuring that the rotor sleeve 2 can be completely covered around the outer periphery of the rotor assembly 3.

[0096] like Figure 7 and Figure 12 As shown, in one embodiment, the rotor sleeve injection molding device further includes: a fixing component 8.

[0097] Specifically, the fixing assembly 8 is formed with a fixing sleeve hole 801 ; the fixing sleeve hole 801 is sleeved on the outer circumference of the rotor sleeve 2 , and the diameter of the fixing sleeve hole 801 is equal to the outer diameter of the rotor sleeve 2 .

[0098] It should be noted that the setting of the fixing component 8 plays a stabilizing role on the rotor sleeve 2, which is used to prevent the outer diameter of the rotor component 3 from becoming larger and the rotor sleeve 2 from cracking due to the high injection pressure during the injection molding process, thereby ensuring the roundness, cylindricity and concentricity of the rotor component after injection molding.

[0099] It should be noted that, before injection molding, the outer circumference of the rotor sleeve 2 is wrapped with a fixing assembly 8 ; after the injection molding is completed, the fixing assembly 8 is removed.

[0100] In one embodiment, the fixing assembly 8 is placed on the tooling tray 4 before injection molding; and is removed from the tooling tray 4 after injection molding is completed.

[0101] In one embodiment, the fixing assembly 8 is made of at least, but not limited to, the following materials: steel, iron, and aluminum.

[0102] like Figure 6 As shown, in one embodiment, the fixing assembly 8 includes a first clamp 802 and a second clamp 803 having two semi-cylindrical (formed by cutting along the radial direction of the cylinder) perforated structures.

[0103] Specifically, the first clamp 802 and the second clamp 803 are connected; and the two semi-cylindrical perforated structures cooperate to form the fixing sleeve hole 801 .

[0104] like Figure 2 、 Figure 4 and Figure 15 As shown, in one embodiment, the rotor assembly 3 includes: a rotor core formed by stacking a magnetic steel 303 and a plurality of silicon steel sheets 301 in sequence.

[0105] Specifically, if Figure 15 As shown, the outer periphery of the silicon steel sheet 301 is located on the circumference of the same target circle (corresponding to Figure 15 On the red curve L in FIG, a plurality of groups of magnetic steel slots 302 (with Figure 4 The rotor core includes 8 groups of magnetic steel slots 302 as an example for explanation); the magnetic steel 303 is inserted into the magnetic steel slots 302; the rotor sleeve 2 is sleeved on the outer periphery of the rotor core, and the rotor sleeve 2 completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sleeve 2 is larger than the outer diameter of the rotor core; the injection molding component 1 is located at one end of the rotor core; injection molding material is injected into the gap between the rotor core and the rotor sleeve 2 through the injection molding component 1 to fix the rotor sleeve 2 to the rotor core.

[0106] It should be noted that by creating a gap between the rotor core and the rotor sleeve 2, the rotor core and the rotor sleeve 2 can be fixed by injecting injection molding material into the gap during injection molding; in addition, by designing the inner diameter of the rotor sleeve 2 to be larger than the outer diameter of the rotor core, it is ensured that the rotor sleeve 2 can be sleeved on the outer periphery of the rotor core while ensuring the normal progress of injection molding, and by injecting more injection molding material between the two, the strength of the rotor assembly after the injection molding is further increased.

[0107] like Figure 4 and Figure 15 As shown, at least a portion of the magnetic steel slots 302 corresponding to the ends of the target circle extend to the target circle.

[0108] In one embodiment, there is a gap between at least a portion of the magnetic steel 303 in the target magnetic steel slot, the end portion corresponding to the target circle, and the end portion corresponding to the target magnetic steel slot.

[0109] In this embodiment, the target magnetic steel slot is a magnetic steel slot 302 corresponding to an end portion of the target circle and extending to the target circle.

[0110] It should be noted that, the injection molding material is injected into the gap between the end of the target circular circumference of the magnetic steel 303 in the target magnetic steel slot and the end of the corresponding target magnetic steel slot through the injection molding component 1, so that the magnetic steel 303 is fixed to the rotor sleeve 2; specifically, when the injection molding material is injected into the gap between the end of the target circular circumference of the magnetic steel 303 in the target magnetic steel slot and the end of the corresponding target magnetic steel slot, the injection molding material will fill the gap between the end of the target circular circumference of the magnetic steel 303 in the target magnetic steel slot and the end of the corresponding target magnetic steel slot on the one hand; on the other hand, it will fill the gap between the end of the target circular circumference of the target magnetic steel slot and the rotor sleeve 2, thereby achieving the fixation between the magnetic steel 303 in the target magnetic steel slot and the rotor sleeve 2.

[0111] like Figure 4 As shown, in one embodiment, there is a gap between at least one end and / or the other end of a portion of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302; injection molding material is injected into the gap between one end and / or the other end of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302 through the injection molding component 1 to fix the rotor core to the magnetic steel 303.

[0112] It should be noted that by creating a gap between one end and / or the other end of at least part of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302, the injection molding material is injected into the gap through the injection molding component 1, thereby achieving the fixation of the rotor core and the magnetic steel 303.

[0113] like Figure 4 As shown, in one embodiment, a plurality of groups of magnetic steel slots 302 are evenly distributed on the silicon steel sheet 301 , and the magnetic steel slots 302 and the magnetic steel 303 are radially symmetrical about the target circle.

[0114] It should be noted that by designing multiple groups of magnetic steel slots 302 to be evenly distributed along the circumferential direction of the target circle, and making the magnetic steel 303 and the magnetic steel slots 302 radially symmetrical about the target circle, the stability and reliability of the overall structure of the rotor sleeve 2 and the rotor assembly 3, as well as the strength of the rotor assembly 3 are ensured after the injection molding is completed.

[0115] In one embodiment, the inner diameter of the rotor sheath 2 is 0.2 mm to 3 mm larger than the outer diameter of the rotor core.

[0116] In one embodiment, the thickness of the rotor sheath 2 is between 0.3 mm and 3 mm.

[0117] like Figure 4 As shown, in one embodiment, each group of the magnetic steel slots 302 includes n open slots (not shown in the figure); n≥1, and n is a positive integer.

[0118] like Figure 4 As shown, in this embodiment, when n≥2 (taking n=2 as an example in the figure), n open slots are spaced apart along the radial direction of the target circle; each open slot includes a first separation slot 3021 and a second separation slot 3022 .

[0119] like Figure 4 As shown, the first dividing groove 3021 and the second dividing groove 3022 are independent of each other, and the first dividing groove 3021 and the second dividing groove 3022 are separated by a preset distance; the magnetic steel 303 includes a first magnetic steel block 3031 and a second magnetic steel block 3032; wherein, the first magnetic steel block 3031 is inserted into the first dividing groove 3021, and the second magnetic steel block 3032 is inserted into the second dividing groove 3022.

[0120] like Figure 4 As shown, in one embodiment, the first dividing groove 3021 and the second dividing groove 3022 are radially symmetrical about the target circle, and the end of the first dividing groove 3021 away from the second dividing groove 3022 and the end of the second dividing groove 3022 away from the first dividing groove 3021 both extend to the circumference of the target circle; the first magnetic steel block 3031 and the second magnetic steel block 3032 are radially symmetrical about the target circle.

[0121] like Figure 4 As shown, in one embodiment, there are gaps between the two ends of the first magnetic steel block 3031 and the corresponding ends of the rotor sleeve 2 and the first dividing slot 3021, and between the two ends of the second magnetic steel block 3032 and the corresponding ends of the rotor sleeve 2 and the second dividing slot 3022.

[0122] Specifically, the injection molding material is injected into the gaps between the two ends of the first magnetic steel block 3031 and the corresponding ends of the rotor sleeve 2 and the first dividing slot 3021, and between the two ends of the second magnetic steel block 3032 and the corresponding ends of the rotor sleeve 2 and the second dividing slot 3022 through the injection molding component 1, so as to fix the rotor sleeve 2, the rotor core and the magnetic steel 303.

[0123] like Figures 7 to 11 As shown, in one embodiment, the injection molding component 1 includes, from an end away from the rotor sleeve 2 to an end close to the rotor sleeve 2 , a glue inlet plate 101 , a diverter plate 102 and a flow channel plate 103 .

[0124] Specifically, the glue inlet plate 101, the diverter plate 102 and the flow channel plate 103 are connected; wherein, Figure 8 As shown, the glue feeding plate 101 is provided with a glue feeding hole 104; the diverter plate 102 is provided with a plurality of diverter channels 105 (in Figure 9 The flow channel plate 103 includes 8 branch channels 105 as an example for explanation); a plurality of groups of reserved injection holes 106 are distributed on the flow channel plate 103; the reserved injection holes 106 correspond to the gap positions between the rotor sleeve 2 and the rotor assembly 3 (specifically, the rotor core), and each group of the reserved injection holes 106 corresponds to one branch channel 105.

[0125] In one embodiment, the plurality of branch channels 105 are evenly distributed on the diverter plate 102, and the plurality of branch channels 105 are symmetrically distributed about the injection hole 104 (e.g., Figure 9 As shown, multiple branch channels 105 are centered on the injection hole 104 and are symmetrically and evenly distributed along the radial direction of the injection hole 104); multiple groups of the reserved injection holes are evenly distributed on the flow channel plate (such as Figure 10 As shown, multiple groups of reserved injection holes 106 are also centered on the glue inlet hole 104 and are symmetrically and evenly distributed along the radial direction of the glue inlet hole 104); the injection material evenly enters the gap between the rotor sleeve 2 and the rotor assembly 3.

[0126] It should be noted that, during injection molding, the end surface of the flow channel plate 103 away from the diverter plate 102 is used to contact the rotor assembly 3 (specifically, the silicon steel sheet 301 at the top layer in the rotor core), and the injection molding material enters the gap between the rotor sleeve 2 and the rotor assembly 3 (specifically, the rotor core) in sequence through the glue inlet hole 104, multiple diverter branches 105 and multiple groups of reserved injection holes 106.

[0127] correspond Figure 4 In the embodiment, such as Figure 10 As shown, each set of reserved injection holes 106 includes 8 injection points (corresponding to Figure 10The eight small circles in the reserved injection holes 106 marked in the figure are divided into two groups (corresponding to the aforementioned n=2), with four injection points in each group, and each group of four injection points corresponds to the gap between one end of the first magnetic steel block 3031 and the rotor sleeve 2, the gap between the other end of the first magnetic steel block 3031 and the corresponding end of the first dividing groove 3021, the gap between one end of the second magnetic steel block 3032 and the rotor sleeve 2, and the gap between the other end of the second magnetic steel block 3032 and the corresponding end of the second dividing groove 3022.

[0128] In one embodiment, a positioning protrusion 107 is provided on the end surface of the flow channel plate 103 away from the diverter plate 102 .

[0129] Specifically, the positioning protrusion 107 is used to cooperate with the positioning hole 304 of the rotor assembly 3 .

[0130] like Figure 15 and Figure 11 As shown, in one embodiment, the number of the positioning protrusions 107 is two, and the two positioning protrusions 107 are symmetrically distributed with respect to the radial direction of the target circle.

[0131] like Figure 3 As shown, the positioning hole 304 is provided on the silicon steel sheet 301 .

[0132] In one embodiment, the number of the positioning holes 304 on each silicon steel sheet 301 is greater than or equal to two.

[0133] Specifically, when the number of the positioning holes 304 is greater than or equal to two, all the positioning holes 304 are evenly and symmetrically distributed in the radial direction of the target circle.

[0134] by Figure 3 The following description is made using an example in which eight positioning holes 304 are provided on each silicon steel sheet 301. It should be noted that two positioning holes 304 that are radially symmetrically distributed about the target circle are used to cooperate with the two positioning protrusions 107 mentioned above. The remaining six positioning holes 304 serve as weight-reducing holes to reduce the overall weight of the rotor assembly 3.

[0135] In one embodiment, a second annular groove 108 is defined on the end surface of the flow channel plate 103 away from the diverter plate 102 .

[0136] Specifically, when the end face of the flow channel plate 103 away from the diverter plate 102 contacts the rotor assembly 3 (specifically, the silicon steel sheet 301 at the top layer in the rotor core), the second annular groove 108 is located at the outer circle of the end face of the rotor assembly 3 (specifically, the silicon steel sheet 301 at the top layer in the rotor core) that contacts the flow channel plate 103; the central axis of the second annular groove 108 is consistent with the central axis of the rotor sleeve 2, and a second sealing ring 109 is provided in the second annular groove 108; one end of the rotor sleeve 2 contacts the second sealing ring 109.

[0137] It should be noted that, through the design of the second sealing ring 109, during the injection molding process, there is soft contact between one end of the rotor sleeve 2 and the second sealing ring 109 (if there is no second sealing ring 109, one end of the rotor sleeve 2 is in direct hard contact with the flow channel plate 103), which effectively prevents the rotor sleeve from rupturing due to excessive pressure during injection clamping, resulting in injection glue overflow.

[0138] In one embodiment, the second sealing ring 109 has an elastic deformation function, that is, during the injection molding process, one end of the rotor sleeve 2 can be squeezed and deformed on the second sealing ring 109, while ensuring a good sealing effect, and at the same time, one end of the rotor sleeve 2 can be extended to the corresponding end of the rotor assembly 3 (corresponding to Figure 2 The outer side of the upper end of the middle rotor assembly 3) (corresponding to Figure 2 to ensure that the rotor sleeve 2 can completely cover the outer periphery of the rotor assembly 3 (specifically, the rotor core).

[0139] In one embodiment, the thickness of the second sealing ring 109 is less than or equal to the height of the second annular groove 108 along the central axis of the rotor sleeve 2 (e.g. Figure 3 and Figure 11 As shown, the thickness of the corresponding second sealing ring 109 is smaller than the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2).

[0140] It should be noted that when the thickness of the second sealing ring 109 is less than the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2, one end of the rotor sleeve 2 can be extended to the outside of the corresponding end of the rotor assembly 3, thereby effectively ensuring that the rotor sleeve 2 can be completely covered on the outer periphery of the rotor assembly 3.

[0141] Similarly, when the thickness of the second sealing ring 109 is equal to the height of the second annular groove 108 along the central axis direction of the rotor sleeve 2, since the second sealing ring 109 has an elastic deformation function, one end of the rotor sleeve 2 can also be extended to the outside of the corresponding end of the rotor assembly 3 (by squeezing the second sealing ring 109 by one end of the rotor sleeve 2 to cause it to undergo elastic deformation), thereby effectively ensuring that the rotor sleeve 2 can be completely covered around the outer periphery of the rotor assembly 3.

[0142] It should be noted that in actual application, before injection molding, the height of the rotor cover 2 can be determined based on the height of the rotor core obtained from the test, and then the rotor cover 2 can be placed on the outer periphery of the rotor core so that it can completely cover the outer periphery of the rotor core.

[0143] In one embodiment, a laser size sensor, an electronic ruler, or the like is used to measure the height of the rotor core.

[0144] In one embodiment, before performing a height test on the rotor core, the rotor core is first compressed to make the height test on the rotor core more accurate.

[0145] It should be noted that the pressure for compacting the rotor core can be set according to the subsequent injection clamping force.

[0146] Specifically, after the height of the rotor core is obtained, the sheath tube material is cut according to the height to obtain the rotor sheath 2 .

[0147] It should be noted that the height of the rotor sleeve 2 cannot be too high or too low. If the height of the rotor sleeve 2 is too high, the rotor sleeve 2 may be crushed during the injection molding process; if the height of the rotor sleeve 2 is too low, the injection molding process may cause glue overflow.

[0148] In one embodiment, the height of the rotor cover 2 is greater than or equal to the height of the rotor core.

[0149] In one embodiment, after the rotor sheath 2 is sleeved on the outer circumference of the rotor core, the distances between the two ends of the rotor sheath 2 and the two ends of the corresponding rotor core are both less than or equal to 10 mm.

[0150] It should be noted that in actual applications, after the injection molding is completed, the two ends of the rotor cover 2 can be extended to the outside of the corresponding two ends of the rotor core, but they cannot be extended too much. It is necessary to ensure that the performance of the motor will not be affected. Therefore, when the height of the rotor cover 2 is greater than the height of the rotor core, it cannot be too large, and the elastic deformation capacity of the first sealing ring 7 and the second sealing ring 109 must be comprehensively considered.

[0151] correspond Figure 12In the embodiment, after the injection molding is completed, the tooling tray 4, the fixing component 8 and the injection molding component 1 are removed, and finally the following is obtained. Figure 13 As shown, a rotor structure having a rotor sleeve 2 is formed by injection molding on the outer periphery of the rotor assembly 3 .

[0152] It should be noted that in the prior art, there is also a method of increasing the rotor strength by winding a sheath on the outer ring of the rotor. However, the sheath winding technology is currently subject to the slow cycle of the winding equipment and the long curing time after the winding is completed, which affects the production cycle and overall efficiency and cannot meet the needs of mass production. The present invention directly adopts a tubular rotor sheath and fixes it to the outer periphery of the rotor core by injection molding. While improving the production efficiency, the strength of the rotor is greatly enhanced due to the increase in injection molding material.

[0153] like Figures 1 to 12 ,and Figure 15 As shown, in one embodiment, the present invention further provides a rotor sheath injection molding system, which includes: a rotor assembly 3 and the above-mentioned rotor sheath injection molding device.

[0154] Specifically, the rotor assembly 3 includes: a rotor core formed by stacking magnetic steel 303 and multiple silicon steel sheets 301 in sequence; the outer periphery of the silicon steel sheets 301 is located on the circumference of the same target circle, and multiple groups of magnetic steel slots 302 are distributed on the silicon steel sheets 301 along the circumferential direction of the target circle; the magnetic steel 303 is inserted into the magnetic steel slots 302; the rotor sleeve 2 of the rotor sleeve injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sleeve 2 completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sleeve 2 is larger than the outer diameter of the rotor core; the injection molding component of the rotor sleeve injection molding device is located at one end of the rotor core; injection molding material is injected into the gap between the rotor core and the rotor sleeve 2 through the injection molding component 1 to fix the rotor sleeve 2 to the rotor core.

[0155] In one embodiment, at least a portion of the ends of the magnetic steel slots 302 corresponding to the circumference of the target circle extend to the outer circumference of the silicon steel sheet 301 .

[0156] In one embodiment, there is a gap between at least part of the magnetic steel 303 in the target magnetic steel slot corresponding to the end of the target circle circumference and the corresponding end of the target magnetic steel slot; the target magnetic steel slot is a magnetic steel slot 302 extending from the end of the target circle circumference to the target circle circumference; injection molding material is injected into the gap between the end of the magnetic steel 303 in the target magnetic steel slot corresponding to the target circle circumference and the corresponding end of the target magnetic steel slot through the injection molding component 1, so that the magnetic steel 303 is fixed to the rotor sleeve 2.

[0157] In one embodiment, there is a gap between at least one end and / or the other end of a portion of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302; injection molding material is injected into the gap between one end and / or the other end of the magnetic steel 303 and the end of the corresponding magnetic steel slot 302 through the injection molding component 1 to fix the rotor core and the magnetic steel 303.

[0158] In one embodiment, a plurality of groups of magnetic steel slots 302 are evenly distributed on the silicon steel sheet 301 , and the magnetic steel slots 302 and the magnetic steels 303 are radially symmetrical about the target circle.

[0159] In one embodiment, each group of the magnetic steel slots 302 includes n open slots; n ≥ 1; when n ≥ 2, the n open slots are spaced apart along the radial direction of the target circle; each of the open slots includes a first separation slot 3021 and a second separation slot 3022; the first separation slot 3021 and the second separation slot 3022 are independent of each other, and the first separation slot 3021 and the second separation slot 3022 are separated by a preset distance; the magnetic steel 303 includes a first magnetic steel block 3031 and a second magnetic steel block 3032; wherein the first magnetic steel block 3031 is inserted into the first separation slot 3021, and the second magnetic steel block 3032 is inserted into the second separation slot 3022.

[0160] In one embodiment, the first dividing groove 3021 and the second dividing groove 3022 are radially symmetrical about the target circle, and the end of the first dividing groove 3021 away from the second dividing groove 3022 and the end of the second dividing groove 3022 away from the first dividing groove 3021 both extend to the circumference of the target circle; the first magnetic steel block 3031 and the second magnetic steel block 3032 are radially symmetrical about the target circle.

[0161] In one embodiment, there are gaps between the two ends of the first magnetic steel block 3031 and the corresponding ends of the rotor sleeve 2 and the first dividing slot 3021, and between the two ends of the second magnetic steel block 3032 and the corresponding ends of the rotor sleeve 2 and the second dividing slot 3022; the injection molding material is injected into the gaps between the two ends of the first magnetic steel block 3031 and the corresponding ends of the rotor sleeve 2 and the first dividing slot 3021, and between the two ends of the second magnetic steel block 3032 and the corresponding ends of the rotor sleeve 2 and the second dividing slot 3022 through the injection molding component 1, so as to fix the rotor sleeve 2, the rotor core and the magnetic steel 303.

[0162] In one embodiment, the height of the rotor cover 2 is greater than or equal to the height of the rotor core.

[0163] It should be noted that the working principle of the rotor sheath injection molding system is the same as that of the above-mentioned rotor sheath injection molding device, so it will not be described in detail here.

[0164] like Figure 14 As shown, in one embodiment, the present invention further provides a rotor sleeve injection molding method based on the above-mentioned rotor sleeve injection molding device, and the rotor sleeve injection molding method includes:

[0165] Step S1: Obtain the height of the rotor assembly.

[0166] Step S2: Obtain the rotor casing according to the height.

[0167] Step S3: Use the rotor sheath to completely cover the outer circumference of the rotor assembly.

[0168] Step S4: positioning the injection molding component at one end of the rotor component.

[0169] It should be noted that when the injection molding component is located at one end of the rotor assembly, it is also located at one end of the rotor sleeve.

[0170] Step S5: injecting molding material into the gap between the rotor sleeve and the rotor assembly through the injection molding component to fix the rotor sleeve and the rotor assembly.

[0171] Step S6: After the injection molding is completed, the injection molding component is removed from the rotor assembly.

[0172] It should be noted that the working principle of the rotor sheath injection molding method can be referred to the above introduction to the rotor sheath injection molding device, so it will not be described in detail here.

[0173] The protection scope of the rotor sleeve injection molding method described in the embodiment of the present invention is not limited to the execution order of the steps listed in this embodiment. All solutions implemented by adding, reducing, or replacing steps in the prior art based on the principles of the present invention are included in the protection scope of the present invention.

[0174] like Figure 13 As shown, in one embodiment, the present invention further provides a rotor manufactured based on the above-mentioned rotor sleeve injection molding method, wherein the rotor comprises: a rotor assembly 3 and a rotor sleeve 2, and an injection molding layer (not shown in the figure) formed by injection molding material.

[0175] Specifically, the injection molding layer is located in the gap between the rotor sleeve 2 and the rotor assembly 3 , so that the rotor sleeve 2 and the rotor assembly 3 are fixed by the injection molding layer.

[0176] The descriptions of the corresponding flow or structure of each of the above figures are each focused, and the parts not described in detail in a certain flow or structure can be referred to the related description of other flow or structure.

[0177] The above embodiments are only illustrative of the principles and effects of the present application, and are not intended to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed by the present application should be covered by the claims of the present application.

Claims

1. A rotor sheath injection molding device, characterized in that: The rotor sleeve injection molding device comprises: an injection molding component and a rotor sleeve; wherein, The rotor sheath is a tubular structure with both ends open, and is used to completely cover the outer circumference of the rotor assembly; The injection molding component is located at one end of the rotor sleeve; The injection molding component is used to inject injection molding material into the gap between the rotor sleeve and the rotor assembly to fix the rotor sleeve and the rotor assembly.

2. The rotor sheath injection molding device according to claim 1, characterized in that: The gap between the rotor sleeve and the rotor assembly includes at least a uniform gap between the inner ring of the rotor sleeve and the outer periphery of the rotor assembly.

3. The rotor sheath injection molding device according to claim 1, characterized in that: The rotor sheath injection molding device further includes: a tooling tray; The tooling tray is arranged at the other end of the rotor sleeve, and a positioning shaft is provided on the tooling tray. The tooling tray is used to place the rotor assembly; the central axis of the positioning shaft is consistent with the central axis of the rotor sleeve; When the rotor assembly is arranged on the tooling tray, the central axis hole of the rotor assembly is sleeved on the positioning shaft.

4. The rotor sheath injection molding device according to claim 3, characterized in that: The positioning shaft is used to be matched with the central shaft hole.

5. The rotor sheath injection molding device according to claim 3, characterized in that: The tooling tray is further provided with a first annular groove; When the rotor assembly is arranged on the tooling tray, the first annular groove is located on the outer ring of the contact end surface of the rotor assembly and the tooling tray; The central axis of the first annular groove is consistent with the central axis of the rotor sleeve, and a first sealing ring is provided in the first annular groove; The other end of the rotor sleeve contacts the first sealing ring.

6. The rotor sheath injection molding device according to claim 5, characterized in that: The thickness of the first sealing ring is less than or equal to the height of the first annular groove along the positioning axis.

7. The rotor sheath injection molding device according to claim 1, characterized in that: The rotor sheath injection molding device further includes: a fixing assembly; The fixing assembly is formed with a fixing sleeve hole; the fixing sleeve hole is sleeved on the outer circumference of the rotor sleeve, and the diameter of the fixing sleeve hole is equal to the outer diameter of the rotor sleeve.

8. The rotor sheath injection molding device according to any one of claims 1 to 7, characterized in that: The injection molding assembly includes, from one end away from the rotor sleeve to the end close to the rotor sleeve, a glue feed plate, a diverter plate and a flow channel plate; the glue feed plate, the diverter plate and the flow channel plate are connected; wherein, The glue feeding plate is provided with a glue feeding hole; A plurality of branch channels are distributed on the diversion plate; The flow channel plate is provided with a plurality of groups of reserved injection holes; the reserved injection holes correspond to the gap positions between the rotor sleeve and the rotor assembly, and each group of the reserved injection holes corresponds to one of the branch channels; During injection molding, the end surface of the flow channel plate away from the diverter plate is used to contact the rotor assembly, and the injection material enters the gap between the rotor sleeve and the rotor assembly through the glue inlet hole, multiple diverter branches and multiple groups of reserved injection holes in sequence.

9. The rotor sheath injection molding device according to claim 8, characterized in that: The plurality of branch channels are evenly distributed on the diverter plate, and the plurality of branch channels are symmetrically distributed about the glue inlet hole; A plurality of groups of the reserved injection holes are evenly distributed on the runner plate; The injection molding material evenly enters the gap between the rotor sleeve and the rotor assembly.

10. The rotor sheath injection molding device according to claim 8, characterized in that: A positioning protrusion is provided on the end surface of the flow channel plate away from the diverter plate; The positioning protrusion is used to cooperate with the positioning hole of the rotor assembly.

11. The rotor sheath injection molding device according to claim 8, characterized in that: A second annular groove is provided on the end surface of the flow channel plate away from the diverter plate; When the end surface of the flow channel plate away from the diverter plate contacts the rotor assembly, the second annular groove is located on the outer circle of the end surface of the rotor assembly that contacts the flow channel plate; The central axis of the second annular groove is consistent with the central axis of the rotor sleeve, and a second sealing ring is provided in the second annular groove; One end of the rotor sleeve contacts the second sealing ring.

12. The rotor sheath injection molding device according to claim 11, characterized in that: The thickness of the second sealing ring is less than or equal to the height of the second annular groove along the central axis of the rotor sleeve.

13. A rotor sheath injection molding system, characterized in that: The rotor sheath injection molding system comprises: a rotor assembly and a rotor sheath injection molding device according to any one of claims 1 to 12; wherein the rotor assembly comprises: a rotor core formed by stacking magnetic steel and a plurality of silicon steel sheets in sequence; The outer periphery of the silicon steel sheet is located on the circumference of the same target circle, and a plurality of groups of magnetic steel slots are distributed on the silicon steel sheet along the circumference of the target circle; The magnetic steel is inserted into the magnetic steel slot; The rotor sheath of the rotor sheath injection molding device is sleeved on the outer periphery of the rotor core, and the rotor sheath completely covers the outer periphery of the rotor core, and the inner diameter of the rotor sheath is larger than the outer diameter of the rotor core; The injection molding material is injected into the gap between the rotor core and the rotor sleeve through the injection molding component of the rotor sleeve injection molding device, so as to fix the rotor sleeve to the rotor core.

14. The rotor sheath injection molding system according to claim 13, characterized in that: At least a portion of the magnetic steel slots corresponding to the ends of the target circle extend to the circumference of the target circle.

15. The rotor sleeve injection molding system according to claim 14, characterized in that: There is a gap between at least part of the ends of the magnetic steel corresponding to the target circle and the ends of the corresponding target magnetic steel slots in the target magnetic steel slots; the target magnetic steel slots are magnetic steel slots that extend from the ends corresponding to the target circle to the circumference of the target circle; The injection molding component is used to inject the injection molding material into the gap between the end of the target circle corresponding to the magnetic steel in the target magnetic steel slot and the end of the corresponding target magnetic steel slot, so as to fix the magnetic steel to the rotor sleeve.

16. The rotor sheath injection molding system according to claim 13, characterized in that: There is a gap between one end and / or the other end of at least part of the magnetic steel and the end of the corresponding magnetic steel slot; The injection molding component is used to inject molding material into the gap between one end and / or the other end of the magnetic steel and the end of the corresponding magnetic steel slot, so as to fix the rotor core and the magnetic steel.

17. The rotor sheath injection molding system according to claim 13, characterized in that: A plurality of groups of magnetic steel slots are evenly distributed on the silicon steel sheet, and the magnetic steel slots and the magnetic steel are radially symmetrical about the target circle.

18. The rotor sleeve injection molding system according to any one of claims 13 to 17, characterized in that: Each group of magnetic steel slots includes n open slots; n≥1; When n≥2, the n open slots are spaced apart along the radial direction of the target circle; Each of the open slots includes a first separation slot and a second separation slot; The first dividing groove and the second dividing groove are independent of each other, and there is a preset distance between the first dividing groove and the second dividing groove; The magnetic steel includes a first magnetic steel block and a second magnetic steel block; wherein the first magnetic steel block is inserted into the first separation groove, and the second magnetic steel block is inserted into the second separation groove.

19. The rotor sheath injection molding system according to claim 18, characterized in that: The first dividing groove and the second dividing groove are radially symmetrical about the target circle, and an end of the first dividing groove away from the second dividing groove and an end of the second dividing groove away from the first dividing groove both extend to the circumference of the target circle; the first magnetic steel block and the second magnetic steel block are radially symmetrical about the target circle.

20. The rotor sheath injection molding system according to claim 13, characterized in that: The height of the rotor sleeve is greater than or equal to the height of the rotor core.

21. A rotor sheath injection molding method implemented based on the rotor sheath injection molding device according to any one of claims 1 to 12, characterized in that: The rotor sleeve injection molding method comprises: Get the height of the rotor assembly; obtaining a rotor casing according to the height; Completely covering the outer circumference of the rotor assembly with the rotor sleeve; Positioning the injection molding component at one end of the rotor component; injecting a molding material into a gap between the rotor sleeve and the rotor assembly through the injection molding assembly to fix the rotor sleeve to the rotor assembly; After the injection molding is completed, the injection molding assembly is removed from the rotor assembly.

22. A rotor manufactured based on the rotor sheath injection molding method according to claim 21, characterized in that: The rotor comprises: a rotor assembly and a rotor sleeve, and an injection molding layer formed by injection molding material; The injection molding layer is located in a gap between the rotor sleeve and the rotor assembly, so that the rotor sleeve and the rotor assembly are fixed through the injection molding layer.

Images