A coil assembly for a micro electric pump and a micro electric pump using the same

Abstract

The coil assembly for micro electric pump comprises a skeleton, an enameled wire winding wound on the skeleton, an insert fixed on the skeleton, and a plastic sealing shell. The winding insert with working current not more than 1A and enameled wire diameter not more than 1mm is split into an inner connecting end of iron material fixed on the skeleton and an outer connecting end of copper material, both of which are limited by a step and a limiting edge, and are riveted by a folding part and a riveting part. The inner connecting end and the riveting part are fixed by plastic sealing, the exposed outer connecting end is connected with external power supply, the copper material consumption of the insert is saved, the cost is reduced, the firmness is increased by the step and the limiting edge of the riveting part, the two folding parts are equivalent to irregular protrusions embedded in the plastic sealing shell, the firmness of the riveting part is further enhanced, and the strength of the insert against plugging force and transverse pushing and pulling force is increased.

Description

Technical Field

[0001] This utility model relates to a coil assembly for a micro electric pump and a micro electric pump, which can be classified as H02K3 / 50 by IPC. Background Technology

[0002] In existing household appliance electric pumps, the stator coil is fixed by a plastic-encased socket for connecting to an external power source. This socket uses a significant amount of material, and since the entire socket is made of copper, the cost is high. Existing design modifications to address this issue include: using a single piece of iron material for the socket, where the wire diameter (greater than 1mm) of enameled wire winding generates excessive heat due to the high resistivity of the iron material when the current exceeds 1A; splitting the socket into two sections, one copper and one iron, and then welding them together reduces the socket's strength against insertion / removal forces and lateral pushing / pulling forces perpendicular to the insertion / removal direction, potentially leading to loosening during use. Increasing the solder between the two sections to maintain strength would actually increase the overall cost, and automating the welding process would require modifying the structure where the two sections are directly welded together.

[0003] For terms and common knowledge, unless otherwise specified in this specification, please refer to Chinese patent documents CN220325373U and CN213878507U, as well as mechanical industry standard JB / T5415 "Miniature Centrifugal Pumps", "IEC Electrical and Electronic Standards Terminology Dictionary" (China Standards Press, 1st edition, 1992), "Electrical Manufacturing Technology" (Mechanical Industry Press, 1st edition, 1982), "Mechanical Engineering Handbook", and "Electrical Engineering Handbook" (Mechanical Industry Press, 1st edition, 1978 and 2nd edition, 1997). Utility Model Content

[0004] To address the technical problem of high stator coil insert costs in household electric pumps as described in the background art, this utility model provides a coil assembly for a micro electric pump with a low-cost insert structure.

[0005] The technical solution of this utility model is:

[0006] A coil assembly for a miniature electric pump includes a frame, an enameled wire winding wound on the frame, a insert fixed on the frame, and a plastic casing. The operating current of the enameled wire winding does not exceed 1A, and the diameter of the enameled wire in the enameled wire winding is not greater than 1mm. The insert includes an inner connecting end made of iron material and an outer connecting end made of copper material.

[0007] The external connection end includes a sheet-like external connection end body and a sheet-like riveting part extending upward from the external connection end body. A step is provided on each of the left and right sides between the riveting part and the external connection end body.

[0008] The inner connection end includes a sheet-like fixing part fixed to the skeleton, a sheet-like inner connection end body, and two folded parts formed by bending from the left and right sides of the lower end of the inner connection end body, with a limiting edge formed at the bending point at the lower end of each folded part.

[0009] A riveting part is placed in the space enclosed by the inner connecting end body and the two folding parts. The two steps and the two limiting edges abut against the limiting parts respectively. The folding parts and the riveting part are riveted together to form a fixed connection.

[0010] The plastic casing covers and fixes the inner connecting end and the riveting part, partially covers the outer connecting end body, and exposes the part of the outer connecting end body away from the riveting part.

[0011] This invention separates the winding insert, which has a working current not exceeding 1A and an enameled wire diameter not exceeding 1mm, into an inner connection end made of iron material and an outer connection end made of copper material, both fixed to the frame. The two are restrained by a step and a limiting edge, and are riveted together by a folded part and a riveting part. The inner connection end and the riveting part are then sealed in plastic to fix them. The exposed part of the outer connection end is connected to an external power source. This saves the amount of copper material used in the insert, meets the conductivity requirements, and reduces costs. The riveting and the steps and limiting edges at the riveting part increase the firmness. The two folded parts are equivalent to irregular protrusions in the injection molded inserts embedded in the plastic seal, further enhancing the firmness of the riveting part, thereby increasing the strength of the insert against insertion and extraction forces and lateral pushing and pulling forces.

[0012] This utility model also discloses a miniature electric pump, including a pump body, a rotor assembly rotatably mounted on the pump body, a stator core, and the aforementioned coil assembly for the miniature electric pump. The terminals of this electric pump are partially made of ferrous material and fixed by appropriate structural riveting or further spot welding and then plastic-sealed, reducing costs while meeting structural strength and conductivity requirements. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of the coil assembly 10 for a micro electric pump according to the first embodiment of this utility model;

[0014] Figure 2 yes Figure 1 A three-dimensional structural diagram of a coil assembly for a miniature electric pump without a plastic-sealed injection molded shell;

[0015] Figure 3 yes Figure 2 Exploded view of a coil assembly for a miniature electric pump without a plastic-sealed plastic casing;

[0016] Figure 4 yes Figure 1 Exploded view of the coil assembly for micro and medium-sized electric pumps before the first insert is riveted;

[0017] Figure 5yes Figure 4 A second-view exploded diagram of the first insert before riveting;

[0018] Figure 6 yes Figure 4 A third-view exploded view diagram before the first insert is riveted;

[0019] Figure 7 yes Figure 4 Front view of the first insert;

[0020] Figure 8 yes Figure 7 AA section view diagram;

[0021] Figure 9 yes Figure 4 Main view of the inner connection end of the first insert;

[0022] Figure 10 yes Figure 4 Main view of the outer connection end of the first insert;

[0023] Figure 11 yes Figure 1 Front view of the second insert of the coil assembly for micro- and medium-sized electric pumps;

[0024] Figure 12 This is a front view of the first insert in the coil assembly for a micro electric pump according to the second embodiment of this utility model;

[0025] Figure 13 yes Figure 12 A schematic diagram showing the frontal orientation of the first insert in the middle;

[0026] Figure 14 This is a front view of the second insert in the coil assembly for a micro electric pump according to the second embodiment of this utility model;

[0027] Figure 15 yes Figure 14 A schematic diagram of the main view orientation of the second insert in the middle;

[0028] Figure 16 This is an axial sectional view of the micro electric pump of this utility model (the stator and coil assembly are not sectionally viewed).

[0029] Figure label:

[0030] The micro electric pump includes a coil assembly 10, a frame 100, a thermal protector 200, an enameled wire winding 300, a plastic casing 400, a first insert 500, a second insert 500a, an inner connecting end 510, a fixing part 511, an inner connecting end body 512, a first folding part 513, a second folding part 514, a limiting edge 515, a first wiring part 516, a second connecting post 517, an outer connecting end 520, an outer connecting end body 521, a first pin (riveting part) 522, a second pin (riveting part) 523, a step 524, an opening 525, a third wiring part 526, a fourth connecting post 527, a fixed connection 530, a pump body 20, and a stator core 30. Detailed Implementation

[0031] This utility model only improves the existing encapsulated coil insert structure for micro electric pumps used in household appliances. The basic structure and working principle of the micro electric pump and stator coil are common knowledge in the field and have been described in Chinese patent document CN220325373U. This utility model inherits the relevant structure and working principle therein. The connection structure between the insert terminal and the thermostat (or thermal protector) has been described in Chinese patent document CN213878507U and will not be repeated here.

[0032] The terms "up," "down," "left," and "right" used in the text are based on Figure 7 The indicated orientation or positional relationship Figure 7 The inner connector is located above the outer connector; "up" and "down" can be interchanged, as can "left" and "right".

[0033] First Embodiment

[0034] like Figure 1-3 The coil assembly 10 for the miniature electric pump of this utility model includes a frame 100, a thermal protector 200, an enameled wire winding 300 wound on the frame 100, two inserts fixed on the frame 100, and a plastic shell 400 covering the winding, the thermal protector 200 and part of the inserts. The operating current of the enameled wire winding 300 does not exceed 1A, the diameter of the enameled wire in the enameled wire winding 300 is not greater than 1mm, and the two inserts are the first insert 500 and the second insert 500a.

[0035] like Figure 4-10The first insert 500 includes an inner connecting end 510 made of iron and an outer connecting end 520 made of copper. The outer connecting end 520 is electrically connected to an external power source. The inner connecting end 510 includes a sheet-like fixing part 511 fixed to the frame 100, a sheet-like inner connecting end body 512, a first folding part 513 formed by bending from the left side of the lower end of the inner connecting end body 512, and a second folding part 514 formed by bending from the right side of the lower end of the inner connecting end body 512. Each folding part has a limiting edge 515 formed at the bending point at its lower end. The portion of the inner connecting end body 512 away from the two folding parts 513 and 514 extends to form a first wiring part 516, which is electrically connected to the enameled wire of a lead-out end of the enameled wire winding 300. The outer connecting end 520 includes a sheet-like outer connecting end body 521, and two pins formed by stamping the outer connecting end body 521 upward toward the inner connecting end body 512. The first pin 522 and the second pin 523 are stamped upwards with an opening 525 cut out between them. The first pin 522 is stamped and cut out with a step 524 on the left side of the outer connecting end body 521, and the second pin 523 is stamped and cut out with a step 524 on the right side of the outer connecting end body 521. The two steps 524 and the two limiting edges 515 are respectively abutted and limited. The first pin 522 is placed into the space enclosed by the inner connecting end body 512 and the first folding part 513 and riveted and then spot welded to form a fixed connection 530. The second pin 523 is placed into the space enclosed by the inner connecting end body 512 and the second folding part 514 and riveted and then spot welded to form a fixed connection 530. The plastic shell 400 covers and fixes the inner connecting end 510, the first pin 522, the second pin 523, and partially covers the outer connecting end body 521, exposing the part of the outer connecting end body 521 away from the two pins 522 and 523.

[0036] like Figure 11 The difference between the second insert 500a and the first insert 500 is that the first wiring portion 516, which extends from the inner connection end body 512 away from the two folding portions 513 and 514, is replaced by the second connecting post 517, which is electrically connected to one pin of the thermal protector 200.

[0037] For windings with a working current not exceeding 1A and an enameled wire diameter not exceeding 1mm, the insert is divided into an inner steel connection end fixed to the frame and an outer copper connection end. These two are restrained by steps and limiting edges. The two folded sections and two pins are riveted together and then spot-welded for fixation. The inner connection end and riveted area are then plastic-sealed for fixation. The exposed outer connection end connects to an external power source. This design saves on copper material usage, meets conductivity requirements, and reduces costs. The riveting and the steps and limiting edges at the riveting points increase rigidity. The two folded sections are equivalent to irregular protrusions in an injection-molded insert embedded in the plastic shell, further enhancing the rigidity of the riveted area. This increases the insert's resistance to insertion / extraction forces and lateral push-pull forces perpendicular to the insertion / extraction direction. If the folded sections and pins are not riveted together, and the two sheet-like inner and outer connection ends are simply welded together to form a complete insert, its rigidity and strength are significantly lower, and it cannot withstand the insertion / extraction forces and lateral push-pull forces specified by the standard.

[0038] The opening between the two pins 522 and 523 can save raw materials, or the raw materials can be retained without opening. In this way, the two pins 522 and 523 are connected to form a whole riveting part. The whole riveting part is placed into the space enclosed by the inner connecting end body 512 and the two folding parts 513, riveted, and then spot welded.

[0039] The above-mentioned riveting and then spot welding connection, which forms a fixed connection, can also be achieved by retaining only the riveting without subsequent spot welding if the riveting strength is sufficient.

[0040] Second Embodiment

[0041] like Figure 12-15 The difference between the second embodiment and the first embodiment is that:

[0042] Remove the first wiring portion 516 formed by the inner connection end body 512 of the first insert 500 extending away from the two folded portions 513 and 514. Remove the second connecting post 517 formed by the second insert 500a extending away from the inner connection end body 512 extending away from the two folded portions 513 and 514. Remove the first pin 522 of the outer connection end 520 of the first insert 500 extending a third wiring portion 526 in a direction away from the outer connection end body 521, which is electrically connected to the enameled wire of a lead end of the enameled wire winding 300. Extend the second pin 523 of the outer connection end 520 of the second insert 500a in a direction away from the outer connection end body 521, which is electrically connected to a pin of the thermal protector 200.

[0043] In this way, the conductive current of the plug flows out through the external connection terminal 520, then through pins 522 and 523, the third terminal 526 or the fourth connection post 527. The entire flow path passes through the copper material of the external connection terminal 520. Compared with the first embodiment, where the current flow path needs to pass through the iron material of the internal connection terminal, this is beneficial to improving the current carrying capacity of the plug.

[0044] like Figure 16 This utility model also discloses a miniature electric pump, including a pump body 20, a rotor assembly rotatably mounted on the pump body 20, a stator core 30, and the aforementioned miniature electric pump coil assembly 10. This miniature electric pump uses the aforementioned miniature electric pump coil assembly 10, which uses small-diameter enameled wire and low current. Its terminals are partially made of ferrous material and fixed by appropriate structural riveting or further spot welding and plastic sealing, thus reducing costs while meeting structural strength and conductivity requirements.

Claims

1. A coil assembly (10) for a miniature electric pump, comprising a frame (100), an enameled wire winding (300) wound on the frame, inserts (500, 500a) fixed on the frame, and a plastic encapsulation shell (400), characterized in that: The operating current of the enameled wire winding (300) does not exceed 1A, and the diameter of the enameled wire in the enameled wire winding (300) is not greater than 1mm; the inserts (500, 500a) include an inner connection end (510) made of iron material and an outer connection end (520) made of copper material. —The external connection end (520) includes a sheet-like external connection end body (521) and a sheet-like riveting part extending upward from the external connection end body (521). A step (524) is provided on each of the left and right sides between the riveting part and the external connection end body (521). —The inner connection end (510) includes a sheet-like fixing part (511) fixed to the frame (100), a sheet-like inner connection end body (512), and two folded parts (513, 514) formed by bending from the left and right sides of the lower end of the inner connection end body (512), with a limiting edge (515) formed at the bending point at the lower end of each folded part. —A riveting part is placed in the space enclosed by the inner connecting end body (512) and the two folding parts (513, 514), and the two steps (524) and the two limiting edges (515) respectively abut against the limiting, and the folding parts (513, 514) and the riveting part are riveted to form a fixed connection (530). —The plastic casing (400) covers and fixes the inner connecting end (510), the riveting part, and partially covers the outer connecting end body (521).

2. The coil assembly for a micro electric pump according to claim 1, characterized in that: The riveting part is formed into two pins (522, 523), and an opening (525) is formed between the two pins. The two pins (522, 523) are each placed into the space enclosed by the inner connecting end body (512) and the two folding parts (513, 514). The two folding parts (513, 514) and the two pins (522, 523) are riveted to form the fixed connection (530).

3. The coil assembly for a micro electric pump according to claim 1, characterized in that: The fixed connection (530) includes a riveted and then welded connection.

4. The coil assembly for a micro electric pump according to claim 1, characterized in that: The inner connection terminal (510) is electrically connected to the enameled wire of one lead-out terminal of the enameled wire winding (300).

5. The coil assembly for a micro electric pump according to claim 1, characterized in that: It also includes a thermal protector (200), the inner connection terminal (510) being electrically connected to one pin of the thermal protector, and the plastic casing (400) covering the thermal protector (200).

6. The coil assembly for a micro electric pump according to claim 1, characterized in that: The riveting portion extends into a third wiring portion (526) in a direction away from the outer connection end body (521), which is electrically connected to the enameled wire of a lead-out end of the enameled wire winding (300).

7. The coil assembly for a micro electric pump according to claim 1, characterized in that: It also includes a thermal protector (200), the riveting portion extending a fourth connecting post (527) in a direction away from the outer connecting end body (521), which is electrically connected to one pin of the thermal protector (200), and the plastic casing (400) covering the thermal protector (200).

8. A miniature electric pump, characterized in that: The micro electric pump includes the coil assembly (10) for the micro electric pump as described in any one of claims 1-7.

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