Fixture, outer rotor motor and process for applying insulating adhesive layer

Abstract

The present application relates to a fixing fixture, an outer rotor motor, and a process for coating an insulating rubber layer. The fixing fixture includes a first shell, a second shell, and a clamp. The first shell, the second shell, and the clamp together define a mounting groove. The mounting groove is used to fix the rotor housing. The side of the mounting groove away from the first shell is open to form a glue injection port. The second shell and the clamp are both detachably mounted on the first shell, and the clamp is arranged around the second shell. According to the fixing fixture of the present invention, the rotor housing and the second shell are tightened by the clamp to prevent the presence of a gap between the magnet and the second shell. Since the surface of the second shell facing the clamp is smooth, the second shell has an area that abuts against the magnet and an area opposite to the rotor housing. After the insulating glue is injected from the glue injection port, the glue flows to cover the inner and outer surfaces of the rotor housing and avoids the magnet. The structure is simple.

Description

Technical Field

[0001] The present application relates to the technical field of rotor motors, and in particular to a fixing fixture, an outer rotor motor, and a process for coating an insulating adhesive layer. Background Art

[0002] The rotor of an external rotor motor generally includes a rotor casing and magnets. The outer diameter of the rotor casing is large and the outer wall is very thin. The rotor casing is deformed during the processing process. After the magnets are installed row by row on the inner wall of the rotor casing, there are gaps and the rotor casing is easily deformed, resulting in poor overall rigidity of the rotor casing. When the motor works in a humid area, it needs to have a certain moisture-proof ability. However, the waterproof structure settings of most motors are relatively complicated, resulting in complicated production processes, complex tooling structures, and high costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a fixing fixture for fixing a rotor housing for coating an insulating rubber layer, which has a simple structure and low cost.

[0004] According to the fixing tool of the present invention, it is used to fix the rotor housing of the outer rotor motor, and the rotor housing is provided with a magnet, including: a first shell, a second shell and a clamp. The first shell, the second shell and the clamp jointly define a mounting groove, and the mounting groove is used to fix the rotor housing. The side of the mounting groove away from the first shell is open to form a glue filling port. The clamp is detachably provided on the first shell, and the clamp is arranged around the second shell. The side surface of the second shell facing the clamp is provided with a clearance groove that is retracted inward in the direction away from the clamp. The clearance groove is used to avoid the magnet, and the depth of the clearance groove is less than the thickness of the magnet exceeding the inner surface of the rotor housing.

[0005] According to the fixing tool of the present invention, when the rotor housing is installed in the mounting groove and glue is required to be poured, the second shell is located on the inner side of the rotor housing. The second shell is used to protect the magnets arranged on the inner side of the rotor housing to prevent the magnets from being covered with the glue layer and affecting the work. The first shell is located below the rotor housing and the rotor housing and the second shell are clamped by a clamp to prevent a gap between the magnet and the second shell. Since the surface of the second shell facing the clamp is smooth, the second shell has an area that is against the magnet and also has an area opposite to the rotor housing. After the insulating colloid is poured into the glue filling port above the mounting groove, the colloid flows to cover the inner and outer surfaces of the rotor housing and avoids the magnet. The fixing tool has a simple structure and low cost.

[0006] According to the fixing fixture of the present invention, the second shell is detachably connected to the first shell, and the bottom wall of the mounting groove extends and sinks below the surface of the first shell facing the second shell.

[0007] According to the fixing tool of the present invention, a positioning member is provided on the first shell, the positioning member defines a receiving groove, and the receiving groove, the clamp and the second shell together define a mounting groove.

[0008] Optionally, an end surface of the positioning member away from the first shell is flush with a surface of the first shell close to the second shell.

[0009] According to the outer rotor motor of the present invention, a positioning groove is further provided on the first housing, and a limiting platform is provided on a side of the second housing facing the first housing, and the limiting platform is clamped in the positioning groove.

[0010] According to the fixing tool of the present invention, the clamp includes a clamping portion and a locking assembly, the clamping portion is arranged around the second shell, and the locking assembly is arranged around the clamping portion.

[0011] According to the outer rotor motor of the present invention, it includes: a stator assembly, the stator assembly includes a base and a stator arranged on the base; a rotor assembly, the rotor assembly includes a rotor shaft and a rotor shell, the rotor shaft is rotatably arranged on the base, the rotor shaft is inserted into the stator, the rotor shell is fixed on the rotor shaft, a magnet is provided on the rotor shell, and the rotor shell is coated with an insulating rubber layer, and the insulating rubber layer avoids the magnet.

[0012] The process for coating an insulating adhesive layer according to the present invention is used to coat the rotor housing of an outer rotor motor, including: fixing the rotor housing in a fixing tool; pouring a preset weight of insulating colloid into the fixing tool; vacuuming the fixing tool at a first preset parameter; baking the fixing tool and baking it at a second preset parameter; and removing the fixing tool and taking out the rotor housing.

[0013] According to the process of coating the insulating adhesive layer of the present invention, the first preset parameter includes a negative pressure value and a first preset time length, wherein the negative pressure value ranges from -100 MPa to -80 MPa, the second preset time length ranges from 3 min to 7 min, and / or

[0014] The second preset parameters include baking temperature and baking time. The baking temperature range is 85° C. to 115° C., and the baking time range is 90 min to 150 min.

[0015] According to the process of coating the insulating adhesive layer of the present invention, before pouring a preset weight of insulating colloid into the fixed tool, it also includes: preheating the fixed tool with a third preset parameter, the third preset parameter including a preheating temperature and a preheating time, wherein the preheating temperature range is 90°C to 110°C, and the preheating time range is 50min to 70min. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 is a perspective view of a fixing fixture to which a rotor housing is fixed according to an embodiment of the present invention;

[0019] Figure 2 A top view of a fixing fixture to which a rotor housing is fixed according to an embodiment of the present invention;

[0020] Figure 3 A side view of a fixing tool according to an embodiment of the present invention;

[0021] Figure 4 is another side view of a fixing tool according to an embodiment of the present invention;

[0022] Figure 5 for Figure 4 Cross-section view in the AA direction;

[0023] Figure 6 An exploded view of a fixing tool according to an embodiment of the present invention;

[0024] Figure 7 is a perspective view of a rotor housing of an outer rotor motor according to an embodiment of the present invention;

[0025] Figure 8 FIG. 4 is a process flow chart of coating an insulating adhesive layer according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] Fixing tool 1, first shell 10, positioning groove 11, receiving groove 12, second shell 20, limit platform 21, give way groove 22, clamp 30, clamping part 31, locking assembly 32, installation groove 40, glue injection port 41, core rod 60, fixing nut 70,

[0028] Rotor housing 2, magnet 2a, insulating rubber layer 2b. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The following describes the fixing fixture 1 , the outer rotor motor, and the process of coating the insulating adhesive layer 2 b according to an embodiment of the present invention with reference to the accompanying drawings.

[0031] The fixing fixture 1 according to the embodiment of the present invention is used to fix the rotor housing 2 of the outer rotor motor, and the rotor housing 2 is provided with a magnet 2a. Figure 1-Figure 3 As shown, the fixing tool 1 includes: a first shell 10 , a second shell 20 and a clamp 30 .

[0032] Specifically, if Figure 4 and Figure 5 As shown, the first shell 10, the second shell 20 and the clamp 30 jointly define a mounting groove 40, which is used to fix the rotor housing 2. The side of the mounting groove 40 away from the first shell 10 is open to form a glue injection port 41. The clamp 30 is detachably arranged on the first shell 10. The clamp 30 is arranged around the second shell 20. A side surface of the second shell 20 facing the clamp 30 is provided with a clearance groove 22 that is retracted inward away from the clamp 30. The clearance groove 22 is used to avoid the magnet 2a. The depth of the clearance groove 22 is less than the thickness of the magnet 2a exceeding the inner surface of the rotor housing 2.

[0033] To elaborate, when the rotor housing 2 needs to be fixed to the fixing fixture 1, the rotor housing 2 is first placed on the first shell 10, and the magnet 2a of the rotor housing 2 is embedded in the clearance groove 22 to achieve pre-positioning, and then the clamp 30 is put on the outside of the rotor housing 2 to fasten the rotor housing 2 and the second shell 20 together, so that the inner wall of the clearance groove 22 abuts against the magnet 2a, thereby preventing the injected insulating colloid from covering the magnet 2a.

[0034] The depth of the clearance groove 22 is less than the thickness of the magnet 2a extending beyond the inner surface of the rotor housing 2, so that the surface of the second shell 20 facing the clamp 30 is opposite to the rotor housing 2, thereby allowing the insulating colloid to flow in and fill. After the insulating colloid is poured into the glue filling port 41, the insulating colloid fills the gap between the rotor housing 2 and the inner wall of the mounting groove 40, thereby coating the insulating glue layer 2b on the inner and outer surfaces of the rotor housing where the insulating glue layer 2b is required, avoiding the magnet 2a. After glue filling, the fixing tool 1 is vacuumed to exhaust the insulating glue, and then the fixing tool 1 and the rotor housing 2 are placed in the drying equipment together to dry and solidify the insulating glue, thereby completing the coating of the insulating glue layer 2b of the rotor housing 2.

[0035] It is understandable that the height of the clamp 30 and the second housing 20 are both greater than the height of the rotor housing 2. When the fixing fixture 1 is used, the fixing fixture 1 needs to be placed so that the glue injection port 41 faces upward.

[0036] In some embodiments, as Figure 1-Figure 3 As shown, the fixing fixture 1 also includes a fixing nut 70 and a core rod 60. A first mounting hole is provided on the first shell 10, and a second mounting hole is provided on the second shell 20. The core rod 60 is inserted into the first mounting hole and the second mounting hole. The end of the core rod 60 away from the first shell 10 is provided with a thread. The fixing nut 70 is sleeved on the core rod 60 and is located on the side of the second shell 20 away from the first shell 10. The fixing nut 70 is used to limit the second shell 20 to prevent the second shell 20 from being misaligned with the first shell 10. The second mounting hole is a through hole, and the first mounting hole is a through hole or a blind hole, which is not limited in this application.

[0037] According to the fixing tool 1 of the embodiment of the present invention, when the rotor housing 2 is installed in the mounting groove 40 and glue is required to be poured, the second shell 20 is located on the inner side of the rotor housing 2. The second shell 20 is used to protect the magnet 2a provided on the inner side of the rotor housing 2 to prevent the magnet 2a from being covered with the glue layer and affecting the work. The first shell 10 is located below the rotor housing 2, and the rotor housing 2 and the second shell 20 are clamped by the clamp 30 to prevent the existence of a gap between the magnet 2a and the second shell 20. Since the surface of the second shell 20 facing the clamp 30 is smooth, the second shell 20 has an area that is against the magnet 2a and also has an area opposite to the rotor housing 2. After the insulating glue is poured into the glue filling port 41 above the mounting groove 40, the glue flows to cover the inner and outer surfaces of the rotor housing 2 and avoids the magnet 2a. The fixing tool 1 has a simple structure and low cost.

[0038] According to the fixing tool 1 of the embodiment of the present invention, the second shell 20 is detachably connected to the first shell 10, such as Figure 6As shown, the bottom wall of the mounting groove 40 extends and sinks below the surface of the first shell 10 facing the second shell 20, thereby forming a receiving groove 12 on the first shell 10. The receiving groove 12 is a part of the mounting groove 40. The rotor housing 2 can be pre-positioned through the receiving groove 12 to prevent the rotor housing 2 from shifting on the first shell 10, causing uneven thickness of the cured insulating rubber layer 2b.

[0039] When installing and fixing the rotor housing 2, first place the rotor housing 2 in the receiving groove 12, then place the second shell 20 on the first shell 10, fix the first shell 10 and the second shell 20 through the core rod 60 and the fixing nut 70, and then put the clamp 30 on the outside of the rotor housing 2 to tighten the rotor housing 2 and the second shell 20, thereby completing the assembly.

[0040] When the rotor housing 2 needs to be removed, the clamp 30 is first loosened and removed, or the core rod 60 and the fixing nut 70 are first removed, and then the second housing 20 is removed, thereby removing the rotor housing 2.

[0041] In addition, the second shell 20 and the first shell 10 are detachable, which makes it easy to disassemble and clean the second shell 20 and the first shell 10 after the glue filling is completed.

[0042] According to the fixing tool 1 of the embodiment of the present invention, a positioning piece is provided on the first shell 10, and the positioning piece defines a receiving groove 12. The receiving groove 12, the clamp 30 and the second shell 20 jointly define the installation groove 40. By replacing the positioning piece with a receiving groove 12 of different sizes, since the circumference of the clamp 30 can be adjusted, it can be used in combination with the positioning piece to achieve positioning of rotor housings 2 of various specifications, thereby improving the adaptability of the fixing tool 1 and achieving the effect of saving costs.

[0043] In some embodiments, the end surface of the positioning member away from the first housing 10 is flush with the surface of the first housing 10 close to the second housing 20 , thereby facilitating the installation of the second housing 20 and the clamp 30 .

[0044] According to an embodiment of the present invention, the outer rotor motor Figure 5 and Figure 6 As shown, a positioning groove 11 is further provided on the first shell 10, and a limiting platform 21 is provided on the side of the second shell 20 facing the first shell 10. The limiting platform 21 is clamped in the positioning groove 11. When the second shell 20 is installed, the second shell 20 can be limited by the cooperation of the limiting platform 21 and the positioning groove 11, so as to better prevent the second shell 20 from shifting, making the position of the second shell 20 more accurate, and facilitating further improving the quality of the insulating rubber layer 2b coated on the rotor shell 2.

[0045] In some embodiments, the limiting platform 21 and the second shell 20 are integrally formed.

[0046] According to the fixing fixture 1 of the embodiment of the present invention, the clamp 30 includes a clamping portion 31 and a locking assembly 32. The clamping portion 31 is arranged around the second housing 20, and the locking assembly 32 is arranged around the clamping portion 31. This provides a better tightening force from the circumferential direction, better fastening the rotor housing and the second housing 20, so that the magnets 2a of the rotor housing are tightly abutted against the second housing 20, preventing the insulating colloid from penetrating and coating the magnets 2a. The locking assembly 32 includes a fastening bolt and a gasket.

[0047] According to an embodiment of the present invention, the outer rotor motor Figure 7 As shown, it includes: a stator assembly and a rotor assembly. The stator assembly includes a base and a stator mounted on the base; the rotor assembly includes a rotor shaft and a rotor housing 2. The rotor shaft is rotatably mounted on the base and passes through the stator. The rotor housing 2 is fixed to the rotor shaft. A magnet 2a is provided on the rotor housing 2 and coated with an insulating rubber layer 2b. The insulating rubber layer 2b avoids the magnet 2a. The insulating rubber layer 2b coating the rotor housing 2 improves the insulation capability of the rotor housing 2 and prevents static electricity, thereby reducing the defective rate during the production of the outer rotor motor. In addition, after being coated with the insulating rubber layer 2b, the moisture resistance and heat transfer capabilities of the rotor housing 2 are improved, thereby improving the performance of the outer rotor motor.

[0048] like Figure 8 As shown, the process for coating the insulating adhesive layer 2b according to an embodiment of the present invention is used to coat the rotor housing 2 of the outer rotor motor, including:

[0049] Step S1: Fix the rotor housing 2 in the fixing fixture 1;

[0050] Step S2: pouring a preset weight of insulating colloid into the fixed tool 1;

[0051] Step S3: vacuuming the fixture 1 according to first preset parameters;

[0052] Step S4: baking the fixed tool 1 and baking it at a second preset parameter;

[0053] Step S5: Remove the fixing fixture 1 and take out the rotor housing 2.

[0054] Among them, the preset weight is obtained by comprehensive calculation based on parameters such as the size of the rotor housing 2, the area to be coated, the thickness of the required insulating glue layer 2b, the type of insulating glue, and the heat shrinkage rate. For different rotor housings 2, the specific value of the preset weight is different and can be calculated according to actual needs. For example, in some embodiments, 400g of insulating glue is required to coat a rotor housing 2.

[0055] Of course, before step S1 , a release agent needs to be applied to the mounting groove 40 of the fixture 1 to facilitate separation of the insulating adhesive layer 2 b from the fixture 1 after solidification and to prevent damage to the insulating adhesive layer 2 b during peeling.

[0056] In step S3, the fixing tool 1 can be directly placed into the vacuum box together with the rotor shell, so that the insulating colloid is kept in a vacuum state for a certain period of time, thereby discharging the gas in the insulating colloid and facilitating the insulating colloid to flow to fill the gap between the rotor shell and the inner wall of the mounting groove 40.

[0057] In step S4 , the fixing fixture 1 and the rotor housing can be placed in a baking oven for baking, so that the insulating colloid is solidified.

[0058] According to the process of coating the insulating adhesive layer 2b in an embodiment of the present invention, the first preset parameter includes a negative pressure value and a first preset time length, wherein the negative pressure value ranges from -100 MPa to -80 MPa, and the second preset time length ranges from 3 min to 7 min.

[0059] The negative pressure value may be -100 MPa, -98 MPa, -96 MPa, -94 MPa, -92 MPa, -90 MPa, -88 MPa, -86 MPa, -84 MPa, -82 MPa, -80 MPa, etc. The second preset time may be 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, etc.

[0060] According to the process of coating the insulating adhesive layer 2b in the embodiment of the present invention, the second preset parameters include a baking temperature and a baking time. The baking temperature ranges from 85°C to 115°C, and the baking time ranges from 90min to 150min.

[0061] The baking temperature may be 85° C., 90° C., 95° C., 100° C., 105° C., 110° C., and 115° C., etc. The baking time may be 90 min, 95 min, 100 min, 105 min, 110 min, 115 min, 120 min, 125 min, 130 min, 135 min, 140 min, 145 min, and 150 min, etc.

[0062] According to the process of coating the insulating adhesive layer 2b of an embodiment of the present invention, before pouring a preset weight of insulating colloid into the fixed tool 1, it also includes: preheating the fixed tool 1 with a third preset parameter, the third preset parameter including a preheating temperature and a preheating time, wherein the preheating temperature range is 90°C to 110°C, and the preheating time range is 50min to 70min.

[0063] The preset temperature may be 90° C., 95° C., 100° C., 105° C., 110° C., etc. The preheating time may be 50 min, 55 min, 60 min, 65 min, 70 min, etc.

[0064] According to the process of coating the insulating adhesive layer 2b of an embodiment of the present invention, by preheating the fixing tool 1 and the rotor housing 2, after the insulating colloid is poured into the mounting groove 40, the portion of the insulating colloid that is in direct contact with the fixing tool 1 or the rotor housing 2 can adhere to each other, slowing down the flow of the insulating colloid, thereby playing a certain "pre-positioning" role.

[0065] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0066] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0067] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A fixing fixture for fixing the rotor housing of an outer rotor motor, wherein the rotor housing is provided with a magnet, characterized in that: include: A first shell, a second shell and a clamp, the first shell, the second shell and the clamp jointly define a mounting groove, the mounting groove is open on a side away from the first shell to form a glue injection port, the clamp is detachably provided on the first shell, the clamp is arranged around the second shell, and a side surface of the second shell facing the clamp is provided with a clearance groove that is retracted inwardly away from the clamp, the clearance groove is used to avoid the magnet, and the depth of the clearance groove is less than the thickness of the magnet exceeding the inner surface of the rotor housing.

2. The fixing tool according to claim 1, characterized in that: The second shell is detachably connected to the first shell, and the bottom wall of the mounting groove extends and sinks below the surface of the first shell facing the second shell.

3. The fixing tool according to claim 1, characterized in that: A positioning member is provided on the first shell, and the positioning member defines a receiving groove. The receiving groove, the clamp and the second shell together define the installation groove.

4. The fixing tool according to claim 3, characterized in that: An end surface of the positioning member away from the first shell is flush with a surface of the first shell close to the second shell.

5. The fixing tool according to claim 1, characterized in that: The first shell is further provided with a positioning groove, and a limiting platform is provided on a side of the second shell facing the first shell, and the limiting platform is clamped in the positioning groove.

6. The fixing tool according to claim 1, characterized in that: The clamp includes a clamping portion and a locking assembly. The clamping portion is arranged around the second shell, and the locking assembly is arranged around the clamping portion.

7. A process for coating an insulating rubber layer for coating the rotor housing of an outer rotor motor, characterized in that: include: Fixing the rotor housing in the fixing fixture according to any one of claims 1 to 6; Pouring a preset weight of insulating colloid into the fixed tool; Vacuuming the fixture at a first preset parameter; baking the fixed tooling at a second preset parameter; Remove the fixing fixture and take out the rotor housing.

8. The process for coating an insulating adhesive layer according to claim 7, characterized in that: The first preset parameter includes a negative pressure value and a first preset duration, wherein the negative pressure value ranges from -100 MPa to -80 MPa, the first preset duration ranges from 3 min to 7 min, and / or The second preset parameters include a baking temperature and a baking time. The baking temperature ranges from 85° C. to 115° C., and the baking time ranges from 90 min to 150 min.

9. The process for coating an insulating adhesive layer according to claim 7, characterized in that: Before pouring a preset weight of insulating colloid into the fixing tool, the method further includes: The fixed tool is preheated with a third preset parameter, wherein the third preset parameter includes a preheating temperature and a preheating time, wherein the preheating temperature ranges from 90° C. to 110° C., and the preheating time ranges from 50 min to 70 min.

10. An outer rotor motor, characterized in that: include: A stator assembly, the stator assembly comprising a base and a stator arranged on the base; A rotor assembly, comprising a rotor shaft and a rotor housing that can be fixed by the fixing tool described in any one of claims 1-6, wherein the rotor shaft is rotatably disposed on the base, the rotor shaft is passed through the stator, the rotor housing is fixed to the rotor shaft, a magnet is provided on the rotor housing, and an insulating rubber layer is coated on the rotor housing, the insulating rubber layer avoids the magnet, wherein the insulating rubber layer is prepared based on the process for coating the insulating rubber layer described in any one of claims 7-9.

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