Coil assembly with thermal protector

Abstract

This utility model discloses a coil assembly with a thermal protector, comprising: a coil frame, a winding wound on the coil frame, a first external connector, a second external connector, and an internal connector fixed on the coil frame, and a thermal protector with its two ends respectively connected to the first external connector and the internal connector; wherein the winding is also adapted to be wound on the winding posts of the second external connector and the internal connector; and both the first external connector and the internal connector have pre-set slots suitable for interference-fitting the leads of the thermal protector. The coil assembly of this utility model simplifies the connection method between the various components of the coil assembly and improves the reliability of the mating structure formed between the various parts.

Description

Technical Field

[0001] This utility model relates to the field of coil processing technology, and in particular to a coil assembly with a thermal protector. Background Technology

[0002] Electric water pumps used in household appliances such as washing machines and dishwashers often employ thermal protectors, which are typically fixed within the coil assembly. Existing technologies, such as... Figure 1 As shown, the thermal insulation lead is installed inside the frame. One end of the thermal insulation lead is wound around the stripped enameled wire, and the other end is wound around the insert position. The two ends of the thermal insulation lead are connected by means of fluxing, tinning, etc. In the existing coil manufacturing method, this structure has the following technical defects:

[0003] First, due to the impact of the molding process, tinning is required for the wiring. However, tinning is expensive, and in actual production, the tinning temperature may be too high, causing the enameled wire to break and resulting in a high rate of coil failure with no resistance.

[0004] Secondly, tin and its compounds can have certain environmental impacts during production and use. In particular, appropriate environmental protection measures are needed when disposing of waste tin.

[0005] Third, the process requires specialized equipment and personnel, and operators must possess certain skills and experience; otherwise, the desired effect cannot be achieved. Furthermore, the structure requires tinning in three locations, making the process quite complex.

[0006] Therefore, further optimization of the structure is needed to address the problems existing in the manufacturing process of coil components in the current technology. Utility Model Content

[0007] The purpose of this invention is to provide a coil assembly with a thermal protector to solve the technical problem of optimizing its overall structure.

[0008] The coil assembly with thermal protector of this utility model is implemented as follows:

[0009] A coil assembly with a thermal protector includes: a coil frame, a winding wound on the coil frame, a first external connector, a second external connector, and an internal connector fixed to the coil frame, and a thermal protector whose two ends are respectively connected to the first external connector and the internal connector; wherein

[0010] The winding is also adapted to be wound on the winding posts of the second outer and inner plates; and

[0011] Both the first external and internal connectors have pre-set slots for the leads of the interference-fit thermal protector.

[0012] In optional embodiments of this utility model, each slot includes an integrally formed and interconnected receiving slot and puncture slot; wherein

[0013] Each lead of the thermal protector is adapted to pass through the piercing groove and be pierced through the outer layer before entering and being secured in the receiving groove.

[0014] In an optional embodiment of this utility model, the first external connector includes a fixing part for connecting to the coil frame, an external connector for connecting to an external structure, and a mounting part provided on one side of the external connector and having the slot pre-set; wherein

[0015] The fixing part, the external part, and the mounting part are integrally formed.

[0016] In an optional embodiment of this utility model, the fixing part has a first toothed structure that engages with the coil frame to prevent detachment; and

[0017] At least one first pressure relief groove is formed on the external part.

[0018] In an optional embodiment of this invention, the inner connector includes an integrally formed connecting portion for connecting to the coil frame and a crimping portion for connecting one of the leads of the thermal protector; wherein

[0019] The crimping part has a pre-set groove.

[0020] In an optional embodiment of this utility model, the two side walls corresponding to the slot inlet of the piercing groove of the inner insert have a front-to-back drop along the insertion direction of the lead wire of the thermal protector.

[0021] In an optional embodiment of this invention, one side edge of the crimping portion is further bent to form the winding post.

[0022] In an optional embodiment of this utility model, the connecting portion is formed with a third tooth-shaped structure that cooperates with the coil frame to prevent disengagement.

[0023] In an optional embodiment of this utility model, the second external connector includes an integrally formed mounting portion for connecting with the coil frame and an external connection portion for connecting with an external structure.

[0024] One side edge of the external connection is also bent to form the winding post.

[0025] In an optional embodiment of this utility model, the mounting portion has a second toothed structure that anti-disengages with the coil frame; and

[0026] At least one second pressure relief groove is formed on the external connection portion.

[0027] In an optional embodiment of this utility model, the outer layer of the iron shell body of the thermal protector is wrapped with a transparent insulating sleeve; and

[0028] The thermal protector has a pair of leads with bends, and the bends are formed between the joint of the lead's interference-fit groove and the body of the lead connected to the thermal protector.

[0029] By adopting the above technical solution, this utility model has the following beneficial effects: The coil assembly with thermal protection of this utility model, through the cooperation of the winding post of the winding with the second external plug and the inner plug, and the interference crimping of the first external plug and the inner plug with the lead wire of the thermal protection, the wiring mode is simpler and more effective. The entire coil assembly has only two tinning points for the connection of the second external plug and the inner plug with the winding, which optimizes the material cost and process mode. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a coil assembly with a thermal protector in the prior art;

[0031] Figure 2 This is a first-view structural schematic diagram of the coil assembly with thermal protector according to the present invention.

[0032] Figure 3 This is a second-view structural schematic diagram of the coil assembly with thermal protector according to the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of the first external plug of the coil assembly with thermal protector according to this utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the second external plug of the coil assembly with thermal protector according to this utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the second external plug of the coil assembly with thermal protector of this utility model before bending treatment of the winding post;

[0036] Figure 7 This is a schematic diagram of the internal insert of the coil assembly with thermal protector according to this utility model;

[0037] Figure 8 This is a schematic diagram of the structure of the inner plug of the coil assembly with thermal protector of this utility model before bending treatment of the winding post.

[0038] Figure 9 This is a schematic diagram of the structure of the thermal protector of the coil assembly with thermal protector according to this utility model.

[0039] In the diagram: coil frame 1, first external connector 2, fixing part 21, external part 22, mounting part 23, first toothed structure 24, circular pressure reducing groove 25, square pressure reducing groove 26, first receiving groove 27, first piercing groove 28, second external connector 3, mounting part 31, external connection part 32, second pressure reducing groove 33, second toothed structure 34, internal connector 4, connecting part 41, crimping part 42, second receiving groove 43, second piercing groove 44, third toothed structure 45, thermal protector 5, lead wire 51, bending part 511, iron shell body 52, transparent insulating sleeve 53, winding post 6, drop K. Detailed Implementation

[0040] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0041] Please see Figures 2 to 9 As shown, this embodiment provides a coil assembly with a thermal protector, including: a coil frame 1, a winding wound on the coil frame 1, a first external connector 2, a second external connector 3, and an internal connector 4 fixed on the coil frame 1, and a thermal protector 5 whose two ends are respectively connected to the first external connector 2 and the internal connector 4; wherein the winding is also adapted to be wound on the winding posts 6 of the second external connector 3 and the internal connector 4; and the first external connector 2 and the internal connector 4 are both pre-set with slots suitable for interference-fitting the lead wires 51 of the thermal protector 5. With this structure, the entire coil assembly has only two tinning points for connecting the second external connector 3 and the internal connector 4 to the winding, which optimizes material costs and manufacturing process.

[0042] Based on the above, both the slots on the first external connector 2 and the internal connector 4 include an integrally formed and interconnected receiving slot and piercing slot; wherein each lead 51 of the thermal protector 5 is adapted to pass through the piercing slot and be pierced through the outer layer before entering and being fixed in the receiving slot.

[0043] To address this, the lead 51 of the thermal protector 5 forms a piercing connection with the slot, and the winding is individually connected to the winding post 6 of the second external connector 3 and the inner connector 4. Compared to the existing technology where all three components are interconnected, this reduces process variables and the defect rate. The slots of the first external connector 2 and the inner connector 4 are designed with a special interference fit, allowing them to withstand the injection pressure of the molding process even without tinning after being pressed with the thermal protector 5, thus preventing the coil assembly from having no resistance before and after molding. The windings are all wound on the winding post 6. Compared to the existing technology where the windings are connected to the lead 51 of the thermal protector 5, the second external connector 3 and the inner connector 4 have greater hardness and rigidity than the lead 51 of the thermal protector 5, which can better withstand the impact during the tinning process, ensuring that tinning at this position does not affect the deformation of the components and reducing the defect rate of tinning the second external connector 3 and the inner connector 4.

[0044] Next, it should be explained that, firstly, the first external plug 2 includes a fixing part 21 for connecting to the coil frame 1, an external part 22 for connecting to an external structure (e.g., an external power supply), and a mounting part 23 provided on one side of the external part 22 and having a pre-set slot; wherein the fixing part 21, the external part 22 and the mounting part 23 are integrally formed.

[0045] Based on the above structure, the fixing part 21 has a first toothed structure 24 that engages with the coil frame 1 to prevent disengagement; and the outer part 22 has at least one first pressure-reducing groove. Here, with reference to the accompanying drawings, an optional case is illustrated where two first pressure-reducing grooves are formed on the outer part 22, one of which is a square pressure-reducing groove 26, and the other is a circular pressure-reducing groove 25. The square pressure-reducing groove 26 is located on the outer part 22 and on the side closer to the mounting part 23. The square pressure-reducing groove 26 can be a square design of (1-1.5) × (1-1.5) mm, with a rounded corner radius of 0.3-0.5. The circular pressure-reducing groove 25 is located on the side of the outer part 22 away from the fixing part 21, and can be located at the axial center of the first outer insert 2. For example, the circular pressure-reducing groove 25 is a through-hole design of 1.7-2 mm. By opening a first pressure-reducing groove on the first external insert 2, the pressure is reduced in the area of ​​the first external insert 2 with more material during stamping, preventing the insert from being punched crooked or broken. In particular, the square pressure-reducing groove 26 is more conducive to controlling the relevant dimensions of the groove on the first external insert 2.

[0046] For ease of description, the slot on the first external connector 2 is defined as the first slot in the following embodiments. The corresponding first slot includes a first receiving slot 27 and a first piercing slot 28. The first piercing slot 28 can be an interference fit design of 0.6 to 0.7 mm. The size of the first receiving slot 27 is larger than the size of the first piercing slot 28. Considering the scratching phenomenon of the lead wire 51 of the thermal protector 5 after piercing and crimping, the first receiving slot 27 adopts a design size of 0.75 to 0.8 mm.

[0047] Additionally, it should be noted that the first puncture groove 28 adopts an interference fit design. After the thermal protection lead 51 is crimped, it is securely locked in the first receiving groove 27, thereby improving the pull-out force and preventing poor contact caused by the pressure impact of the molding process. The depth of the first puncture groove 28 can be selected as 3-4mm. Increasing the spacing at the interference fit can better support the lead 51 of the thermal protector 5 located in the first receiving groove 27, and better ensure the process connection between the thermal protector 5 and the first external connector 2.

[0048] Secondly, the inner connector 4 includes an integrally formed connecting portion 41 for connecting with the coil frame 1 and a crimping portion 42 for connecting one of the leads 51 of the thermal protector 5; wherein the crimping portion 42 has a pre-set groove. One side edge of the crimping portion 42 is also bent to form a winding post 6. Here, in order to improve the reliability of the mating structure formed between the connecting portion 41 and the coil frame 1, a third toothed structure 45 is formed on the connecting portion 41 to prevent disengagement from the coil frame 1.

[0049] For ease of description, the slot on the inner insert 4 is defined as the second slot in the following embodiments, and the corresponding second slot includes the second receiving slot 43 and the second puncture slot 44.

[0050] Based on the above structure, the two side walls corresponding to the inlet of the second piercing groove 44 of the second slot of the inner insert 4 have a front-to-back drop K along the insertion direction of the lead 51 of the thermal protector 5. The size of the drop K is between 0.7 and 1 mm. The material design of the bottom of the front-to-back drop K of the inlet of the second piercing groove 44 makes it easier to ensure that the lead 51 of the thermal protector 5 is crimped into the second slot. The smooth transition better protects the lead 51 of the thermal protector 5 from being scratched, thereby avoiding the problem of poor connection between the lead 51 of the thermal protector 5 and the inner insert 4.

[0051] It should also be noted that one side edge of the crimping part 42 is bent to form a winding post for winding the coil. In one optional embodiment, the winding post is bent at 90°, and the top of the winding post 6 is provided with an annular groove for connecting with the winding. The winding post 6 here is designed with a 90° bend, and before bending, the winding post 6 and the connecting part 41 are parallel, which makes the stamping process easier to arrange, reduces waste, and improves the product's cost advantage and environmental advantage.

[0052] Furthermore, the second external connector 3 includes an integrally formed mounting portion 31 for connecting with the coil frame 1 and an external connecting portion 32 for connecting with an external structure; one side edge of the external connecting portion 32 is also bent to form a winding post. The bending of the winding post here can be similar to that of the winding post on the internal connector 4, so it will not be described in detail here.

[0053] Based on the above structure, the mounting portion 31 has a second toothed structure 34 that engages with the coil frame 1 to prevent disengagement; and the external connection portion 32 has at least one second pressure-reducing groove 33. Regarding the design of the second pressure-reducing groove 33, only one groove can be designed, and its function is similar to that of the pressure-reducing groove on the first external connector 2, so it will not be described in detail here.

[0054] Finally, it should be noted that, in conjunction with the accompanying drawings, one optional implementation is provided, in which the outer layer of the metal casing 52 of the thermal protector 5 is wrapped with a transparent insulating sleeve 53. Here, by wrapping the metal casing 52 with a transparent insulating sleeve 53, the conductive components inside the metal casing 52 are in close contact with the metal casing. When energized, there is current on the surface of the metal casing. Since the plastic-encapsulated casing requires the metal casing to be in close contact with the enameled wire, considering the risk of damage to the enamel film, an additional layer of insulation is needed outside the metal casing. Using a thermoplastic process, the transparent insulating sleeve 53 fits the metal casing better, saving space in the insulation system.

[0055] The thermal protector 5 has a pair of leads 51 each with a bent portion 511. The bent portion 511 is formed between the joint of the interference fit groove of the lead 51 and the body of the lead 51 connected to the thermal protector 5. When the lead 51 of the thermal protector 5 is 7.5 to 11 mm in length, the deformation of the lower end of the lead 51 at the crimping point cannot be controlled during crimping, and there is no support point on the excessively long lead 51. The design of the bent portion 511 here allows the bent lead 51 to use the bent portion 511 as a support point, reducing the stress length, better ensuring the deformation range of the lead 51, and avoiding phenomena such as injection molding failure and poor injection molding.

[0056] In summary, the coil assembly of this embodiment simplifies the connection method between the various components of the coil assembly and improves the reliability of the mating structure formed between the various parts.

[0057] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0058] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0059] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0060] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0062] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A coil assembly with a thermal protector, characterized in that, include: The coil frame, the winding wound on the coil frame, the first external connector, the second external connector and the inner connector fixed on the coil frame, and the thermal protector whose two ends are respectively connected to the first external connector and the inner connector; wherein The winding is also adapted to be wound on the winding posts of the second outer and inner plates; and Both the first external and internal connectors have pre-set slots for the leads of the interference-fit thermal protector.

2. The coil assembly with a thermal protector according to claim 1, characterized in that, Each of the slots includes an integrally formed and interconnected receiving slot and a piercing slot; wherein Each lead of the thermal protector is adapted to pass through the piercing groove and be pierced through the outer layer before entering and being secured in the receiving groove.

3. The coil assembly with a thermal protector according to claim 1 or 2, characterized in that, The first external connector includes a fixing part for connecting to the coil frame, an external connector for connecting to an external structure, and a mounting part located on one side of the external connector and having a pre-set slot; wherein The fixing part, the external part, and the mounting part are integrally formed.

4. The coil assembly with a thermal protector according to claim 3, characterized in that, The fixing part has a first tooth-shaped structure that cooperates with the coil frame to prevent detachment; and At least one first pressure relief groove is formed on the external part.

5. The coil assembly with a thermal protector according to claim 1 or 2, characterized in that, The inner connector includes an integrally formed connecting portion for connecting to the coil frame and a crimping portion for connecting one of the leads of the thermal protector; wherein The crimping part has a pre-set groove.

6. The coil assembly with a thermal protector according to claim 5, characterized in that, The two side walls corresponding to the piercing groove of the slot of the inner insert have a front-to-back drop along the insertion direction of the lead wire of the thermal protector.

7. The coil assembly with a thermal protector according to claim 5, characterized in that, One side edge of the crimping portion is also bent to form the winding post.

8. The coil assembly with a thermal protector according to claim 5, characterized in that, The connecting part has a third tooth-shaped structure that cooperates with the coil frame to prevent disengagement.

9. The coil assembly with a thermal protector according to claim 1, characterized in that, The second external connector includes an integrally formed mounting portion for connecting with the coil frame and an external connection portion for connecting with an external structure. One side edge of the external connection is also bent to form the winding post.

10. The coil assembly with a thermal protector according to claim 9, characterized in that, The mounting portion has a second toothed structure that anti-detaches from the coil frame; and At least one second pressure relief groove is formed on the external connection portion.

11. The coil assembly with a thermal protector according to claim 1, characterized in that, The outer layer of the iron shell of the thermal protector is wrapped with a transparent insulating sleeve; and The thermal protector has a pair of leads with bends, and the bends are formed between the joint of the lead's interference-fit groove and the body of the lead connected to the thermal protector.

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