An improved coil structure plastic package coil assembly and electromagnetic pump

Abstract

The application discloses a plastic-coated coil assembly with an improved coil holder structure and an electromagnetic pump. The plastic-coated coil assembly comprises a coil assembly and a plastic-coated shell. The coil assembly comprises a coil holder, a plug, a winding and a magnetic yoke. The coil holder comprises a main body, a first baffle and a second baffle. The first baffle comprises an arc-shaped baffle edge and two linear mounting portions in axial projection. The plug is arranged on the mounting portions. The two mounting portions are connected with the baffle edge respectively. First and second guide portions are arranged on the side surfaces of the two mounting portions respectively. In the orthogonal projection of the plane where the mounting portions are provided for mounting the plug as a projection plane, the outlines of the first and second guide portions are located in the outline of the magnetic yoke. When the magnetic yoke is arranged on the outer side of the coil holder, the first and second guide portions block the starting section and the tail section of the winding, so as to reduce the collision probability between the winding and the magnetic yoke during the injection molding of the plastic-coated shell, and improve the production qualification rate of the plastic-coated coil assembly.

Description

Technical Field

[0001] This utility model relates to a plastic-encapsulated coil assembly with an improved coil frame structure, and more particularly to an electromagnetic pump using the modified plastic-encapsulated coil assembly, which is classified under IPC F16K31 / 06. Background Technology

[0002] The existing structure of a plastic-encapsulated stator, as shown in prior patent publication number CN221175888U, entitled "A Coil Assembly and an Electromagnetic Valve and Electromagnetic Pump Using the Coil Assembly," includes a coil assembly and a plastic-encapsulated shell injection-molded onto the coil assembly. The coil assembly includes a coil frame, windings wound on the coil frame, inserts disposed on the coil frame, and a magnetic yoke sleeved on the coil frame. In existing plastic-encapsulated stators, during the injection molding of the plastic-encapsulated shell, the molten plastic pushes the starting and / or ending segments of the windings to collide with the magnetic yoke, causing a short circuit or breakage between the windings and the magnetic yoke. Therefore, there is a need for improvement. Summary of the Invention

[0003] This utility model proposes an improved coil frame structure for encapsulated coil assembly to solve the above-mentioned technical problems, especially to solve the technical problem of collision between the winding and the magnetic yoke during injection molding of the encapsulated shell.

[0004] This utility model provides an improved coil frame structure encapsulated coil assembly, comprising a coil assembly and an encapsulated shell injection molded onto the coil assembly;

[0005] The coil assembly includes a coil frame, inserts, windings wound on the coil frame, and a magnetic yoke sleeved on the outside of the coil frame;

[0006] The coil frame includes a hollow cylindrical main body and a first baffle and a second baffle disposed on both axial sides of the main body;

[0007] The first baffle includes a flange portion with an arc shape in axial projection and two mounting portions with a line shape in axial projection, and the insert is disposed on the mounting portion;

[0008] The two mounting parts are connected to the retaining edge, and the two mounting parts are respectively provided with a first guide part and a second guide part folded towards the winding side. In the orthographic projection with the plane of the mounting part for insert installation as the projection plane, the outlines of the first guide part and the second guide part are located within the outline of the magnetic yoke, so that when the magnetic yoke is sleeved on the outside of the coil frame, the first guide part and the second guide part will block the starting and ending sections of the winding, reduce the probability of the winding colliding with the magnetic yoke during injection molding of the plastic encapsulation shell, and improve the yield rate of the plastic encapsulated coil assembly.

[0009] Furthermore, in the orthographic projection with the plane on which the mounting part is used for mounting the insert as the projection plane, the range of the angle α between the first guide part and the mounting part is 110°~135°, and the range of the angle β between the second guide part and the mounting part is 110°~135°.

[0010] Furthermore, the thickness of both the first guide portion and the second guide portion is less than the thickness of the mounting portion.

[0011] Furthermore, the radial surface of the first baffle is recessed to form a first guide groove near the inner side of the first guide portion and a second guide groove near the inner side of the second guide portion.

[0012] Furthermore, the first baffle is recessed at its axial end face toward the main body to form a first notch communicating with the first guide groove and a second notch communicating with the second guide groove.

[0013] Furthermore, the first gap extends to the main body.

[0014] Furthermore, the coil assembly also includes a thermostat, and the inserts include a connecting insert and a first insert and a second insert for external power supply. The two pins of the thermostat are connected to the connecting insert and the second insert, respectively. The plastic encapsulation housing encloses the thermostat and the connection between the thermostat and the connecting insert and the second insert within the space formed by the housing and the coil frame.

[0015] Furthermore, the coil assembly also includes a diode, and the insert includes a winding insert. The two leads of the diode are connected to the connecting insert and the winding insert, respectively. The plastic casing encapsulates the diode and the connection points between the diode and the connecting insert and the winding insert within the space enclosed by the housing and the coil frame.

[0016] Furthermore, the coil assembly also includes a first magnetic sleeve, a second magnetic sleeve, and a positioning ring that separates the two, all disposed inside the hollow interior of the coil frame.

[0017] An electromagnetic pump includes a tubular pump body with an inlet, a tubular pump cover with an outlet on the pump body, a first one-way valve assembly disposed between the pump cover and an inner tube, a hollow cylindrical movable iron core installed in the pump body, a second one-way valve assembly disposed between the outlet of the movable iron core and the inner tube, and a main spring axially disposed between the movable iron core and the pump body. The pump body is characterized by further including a plastic-encapsulated coil assembly with an improved coil frame structure, wherein the pump body is fixedly mounted on the plastic-encapsulated coil assembly with the improved coil frame structure.

[0018] The electromagnetic pump of this invention has a high production qualification rate and high working stability due to the optimized design of the coil assembly. Attached Figure Description

[0019] Figure 1This is a three-dimensional structural diagram of the encapsulated coil assembly with improved coil frame structure according to this utility model;

[0020] Figure 2 This is an axial sectional view of the encapsulated coil assembly with the improved coil frame structure of this utility model;

[0021] Figure 3 This is a three-dimensional structural schematic diagram of the coil assembly of this utility model;

[0022] Figure 4 This is a top view of this practical coil assembly;

[0023] Figure 5 This is a three-dimensional structural diagram of the coil frame of this utility model;

[0024] Figure 6 This is a three-dimensional structural diagram of the coil frame of this utility model from another angle;

[0025] Figure 7 This is a top view of the coil frame of this utility model;

[0026] Figure 8 This is a three-dimensional structural diagram of the second insert of this utility model;

[0027] Figure 9 This is a three-dimensional structural diagram of the connecting insert of this utility model;

[0028] Figure 10 This is a three-dimensional structural schematic diagram of the winding insert of this utility model;

[0029] Figure 11 This is an axial sectional view of the electromagnetic pump of this utility model.

[0030] Wherein: 10-coil assembly, 20-molded housing, 30-molded coil assembly, 40-pump body, 50-pump cover, 61-first check valve assembly, 62-second check valve assembly, 70-movable iron core, 80-main spring, 100-coil frame, 110-main body, 120-first baffle, 121-edge part, 122-mounting part, 123-first guide part, 124-second guide part, 125-first guide groove, 126-second guide groove, 127-first notch, 128-second notch, 130-second baffle, 200-winding, 300-yoke, 310-first magnetic sleeve, 320-positioning ring, 330-second magnetic sleeve, 400-temperature controller, 410-temperature controller First pin, 420-Thermostat second pin, 430-Thermostat body, 500-First insert, 600-Second insert, 610-Second insert body, 620-Second contact part, 630-Second wiring part, 640-Second crimping part, 700-Diode, 710-Diode first pin, 720-Diode second pin, 730-Diode body, 800-Connecting insert, 810-Connecting insert body, 820-First hook part, 830-Insert wire connection part, 840-Insert crimping part, 900-Wire-wound insert, 910-Wire-wound insert body, 920-Second hook part, 930-Wire-wound wiring part, 931-Wiring part, 932-Wire-wound part, 940-Wire-wound crimping part Detailed Implementation

[0031] This utility model discloses a plastic-encapsulated coil assembly with an improved coil frame structure, see [link to utility model]. Figure 1 and Figure 2 The encapsulated coil assembly 30 includes a coil assembly 10 and an encapsulated housing 20. See [link / reference]. Figures 3 to 7 The coil assembly 10 of this utility model includes a coil frame 100, inserts disposed on the coil frame 100, a winding 200 wound on the coil frame 100, and a magnetic yoke 300 sleeved on the outside of the coil frame 100. The coil frame 100 includes a hollow cylindrical main body 110, a first baffle 120 disposed at one axial end of the main body 110, and a second baffle 130 disposed at the other axial end of the main body 110. The first baffle 120 includes a flange portion 121 with an arcuate axial projection, a mounting portion 122 with a linear axial projection, and a first guide portion 123 and a second guide portion 124 respectively provided on the two sides connecting the mounting portion 122 and the flange portion 121, which are folded towards the winding 200. In the orthographic projection of the coil assembly 10 with the plane of the mounting portion for insert installation as the projection plane, the outlines of the first guide portion 123 and the second guide portion 124 are both located within the outline of the magnetic yoke 300.

[0032] See Figures 1 to 3The encapsulated shell 20 of this utility model is formed by injection molding using the coil assembly 10 as a mold insert. After injection molding, the encapsulated shell 20 encloses the radial surfaces of the winding 200 and the yoke 300 within the space formed by the coil assembly 100 and the coil frame 100.

[0033] The improved coil frame structure of this utility model for encapsulated coil assembly features a first guide portion and a second guide portion on two radial sides of the coil frame mounting portion. When the magnetic yoke is sleeved on the outside of the coil frame, the first guide portion and the second guide portion block the beginning and end sections of the winding, reducing collisions between the winding and the magnetic yoke during injection molding of the encapsulated shell and improving the yield rate of the encapsulated coil assembly.

[0034] See Figures 5 to 7 In one embodiment, the radial surface of the first baffle 120 of the coil frame 100 is recessed to form a first guide groove 125 near the first guide portion 123 and a second guide groove 126 near the second guide portion 124. After the yoke is installed, the first guide portion 123 of the coil frame is flipped up towards the mounting portion 122 and located radially between the yoke 300 and the first guide groove 125; the second guide portion 124 of the coil frame is flipped up towards the mounting portion 122 and located radially between the yoke 300 and the second guide groove 126. This design helps to protect the starting and ending sections of the winding, reduces the impact on the starting and ending sections of the winding, and further improves the yield rate of the encapsulated coil assembly production.

[0035] Furthermore, see Figure 7 The first baffle 120 has a recessed axial end face facing the main body 110, forming a first notch 127 communicating with the first guide groove 125 and a second notch 128 communicating with the second guide groove 126. This design guides the starting and ending sections of the winding, reducing the time for the winding machine to feed and unwind the wire, thus improving production efficiency. Furthermore, to ensure the winding machine evenly winds the winding onto the coil frame and reduces the chance of wire breakage at the exit point, the first notch 127 extends to the main body 110.

[0036] See Figure 7In a preferred embodiment, to facilitate the insertion and exit of the winding machine while simultaneously fitting the first guide portion 123 and the second guide portion 124 into the magnetic yoke 300, before the coil frame 110 is installed in the magnetic yoke 300, in the orthographic projection with the plane for mounting the insert portion as the projection plane, the angle α between the first guide portion 123 and the mounting portion 122 ranges from 110° to 135°, and the angle β between the second guide portion 124 and the mounting portion 122 ranges from 110° to 135°. Furthermore, to reduce the risk of breakage when the first guide portion 123 and the second guide portion 124 are bent, preferably, the thickness of both the first guide portion 123 and the second guide portion 124 is less than the thickness of the mounting portion 122.

[0037] See Figure 3 and Figure 8 The coil assembly 10 of this utility model also includes a thermostat 400. The inserts include a connector 800 mounted on the coil frame, a first connector 500 for external power supply, and a second connector 600 for external power supply. The second connector 600 includes a plate-shaped second connector body 610, a second power-connecting portion 620 extending from the second connector body 610 for connection to an external power source, a second wiring portion 630 formed by bending the second connector body 610, and a second crimping portion 640 formed by bending the second wiring portion 630. During assembly, the thermostat's first pin 410 passes through the space enclosed by the second wiring portion 630 and the second crimping portion 640, and then the second crimping portion 640 presses down to electrically connect the thermostat's first pin 410 and the second wiring portion 630. This structure facilitates automated connection between the second connector 600 and the thermostat's first pin 410, improving installation efficiency. As one embodiment, the structure of the first plug 500 is generally the same as that of the second plug 600, including a first plug body for connection to an external power source, a first wiring portion formed by bending the first plug body, and a first crimping portion formed by bending the first wiring portion.

[0038] See Figure 3 and Figure 9 In a preferred embodiment, the connecting insert 800 of this utility model includes a plate-shaped connecting insert body 810, a first hook portion 820 formed by flipping up the connecting insert body, an insert wiring portion 830, and an insert crimping portion 840 formed by bending the insert wiring portion 830. During assembly, after the second temperature controller pin 420 of the temperature controller passes through the space enclosed by the wiring portion 830 and the crimping portion 840, the crimping portion 840 presses down to electrically connect the second temperature controller pin 420 and the insert wiring portion 830.

[0039] The connecting tabs designed above facilitate connection with the thermostat, which helps improve installation efficiency.

[0040] See Figure 3 and Figure 10The coil assembly 10 of this invention also includes a diode 400, and the insert further includes a winding insert 900 disposed on the mounting portion 122. The winding insert 900 includes a plate-shaped winding insert body 910, a second hook 920 formed by flipping up the insert body, a winding connection portion 930, and a winding crimping portion 940 formed by bending the winding connection portion 930. The winding connection portion 930 has a columnar connection portion 931 and a winding portion 932 with a width smaller than the connection portion. During assembly, the lead or lead wire of the winding 200 is wound around the winding portion 932 and passes through the connection portion 931. Then, the winding crimping portion 940 presses down to connect the winding 200 to the winding connection portion 930. This design facilitates the connection of the winding insert with the winding and the diode, improving installation efficiency.

[0041] See Figure 2 The coil assembly 20 of this invention also includes a first magnetic sleeve 310, a second magnetic sleeve 330, and a positioning ring 320 separating the two, all disposed inside the hollow interior of the coil frame. During installation, one axial end of the magnetic yoke 300 is connected to the first magnetic sleeve 310, and the other axial end is connected to the second magnetic sleeve 320. This design simplifies the structure of the magnetic yoke and facilitates manufacturing.

[0042] See Figure 11 This utility model also discloses an electromagnetic pump, which includes a plastic-encapsulated coil assembly 30 with the improved coil frame structure described above, a tubular pump body 40 with an inlet fixedly mounted on the plastic-encapsulated coil assembly 30 with the improved coil frame structure, a tubular pump cover 50 covering the pump body with an outlet, a first one-way valve assembly 61 disposed between the pump cover and the inner tube, a hollow cylindrical movable iron core 70 installed in the pump body, a second one-way valve assembly 62 disposed between the outlet of the movable iron core and the inner tube, and a main spring 80 axially disposed between the movable iron core and the pump body. The improvement of this utility model lies in the structure of the plastic-encapsulated coil assembly 30; other structures can be referred to in the background patent or prior art, and will not be elaborated here.

[0043] This utility model is not limited to the above-described embodiments. If any modifications or variations to this utility model do not depart from the spirit and scope of this utility model, and if such modifications and variations fall within the scope of the claims and equivalent technologies of this utility model, then this utility model also intends to include such modifications and variations.

Claims

1. A plastic-encapsulated coil assembly with an improved coil frame structure, comprising a coil assembly (10) and a plastic-encapsulated housing (20) injection-molded onto the coil assembly (10). The coil assembly (10) includes a coil frame (100), inserts, a winding (200) wound on the coil frame, and a magnetic yoke (300) sleeved on the outside of the coil frame. The coil frame (100) includes a hollow columnar main body (110) and a first baffle (120) and a second baffle (130) disposed on both axial sides of the main body (110). The first baffle (120) includes a baffle portion (121) with an arc shape in axial projection and two mounting portions (122) with a line shape in axial projection, and the insert is disposed on the mounting portion (122); Its features are: The two mounting portions (122) are respectively connected to the baffle portion (121), and the two mounting portions (122) are respectively provided with a first guide portion (123) and a second guide portion (124) folded towards the side of the winding (200). In the orthographic projection with the plane of the mounting portion for insert installation as the projection plane, the outlines of the first guide portion (123) and the second guide portion (124) are located within the outline of the yoke (300), so that when the yoke (300) is sleeved on the outside of the coil frame (100), the first guide portion (123) and the second guide portion (124) will block the beginning and end of the winding (200), reducing the probability of the winding (200) colliding with the yoke (300) when the plastic-molded shell is sealed.

2. The encapsulated coil assembly with improved coil frame structure according to claim 1, characterized in that... In the orthographic projection with the plane on which the mounting part is used for mounting the insert as the projection plane, the angle α between the first guide part (123) and the mounting part (122) is in the range of 110°~135°, and the angle β between the second guide part (124) and the mounting part (122) is in the range of 110°~135°.

3. The encapsulated coil assembly with an improved coil frame structure according to claim 1 or 2, characterized in that: The thickness of the first guide portion (123) and the second guide portion (124) is less than the thickness of the mounting portion (122).

4. The encapsulated coil assembly with improved coil frame structure according to claim 1, characterized in that: The radial surface of the first baffle (120) is recessed to form a first guide groove (125) near the inner side of the first guide portion (123) and a second guide groove (126) near the inner side of the second guide portion (124).

5. The encapsulated coil assembly with improved coil frame structure according to claim 4, characterized in that: The first baffle (120) has a recessed axial end face facing the main body (110) to form a first notch (127) communicating with the first guide groove (125) and a second notch (128) communicating with the second guide groove (126).

6. The encapsulated coil assembly with improved coil frame structure according to claim 5, characterized in that: The first notch (127) extends to the main body (110).

7. The encapsulated coil assembly with improved coil frame structure according to claim 1, characterized in that: The coil assembly (10) also includes a thermostat (400). The insert includes a connecting insert (800) and a first insert (500) and a second insert (600) for external power supply. The two pins of the thermostat (400) are respectively connected to the connecting insert (800) and the second insert (600). The plastic-encased housing (20) encloses the thermostat (400) and the connection between the thermostat and the connecting insert (800) and the second insert (600) within the space enclosed by the thermostat and the coil frame (100).

8. The encapsulated coil assembly with improved coil frame structure according to claim 7, characterized in that: The coil assembly (10) also includes a diode (700), and the insert includes a winding insert (900). The two pins of the diode (700) are connected to the connecting insert (800) and the winding insert (900) respectively. The plastic casing (20) encloses the diode (700) and the connection between the diode and the connecting insert (800) and the winding insert (900) within the space enclosed by the diode and the coil frame (100).

9. The encapsulated coil assembly with improved coil frame structure according to claim 1, characterized in that: The coil assembly (10) further includes a first magnetic sleeve (310), a second magnetic sleeve (330) disposed inside the hollow interior of the coil frame (100), and a positioning ring (320) separating the two.

10. An electromagnetic pump, comprising a tubular pump body (40) with an inlet, a tubular pump cover (50) with an outlet on the pump body, a first one-way valve assembly (61) disposed between the pump cover and an inner tube, a hollow cylindrical movable iron core (70) installed in the pump body, a second one-way valve assembly (62) disposed between the outlet of the movable iron core and the inner tube, and a main spring (80) axially disposed between the movable iron core and the pump body, characterized in that: It also includes a plastic-encapsulated coil assembly with an improved coil frame structure as described in any one of claims 1 to 9, wherein the pump body (40) is fixedly mounted on the plastic-encapsulated coil assembly with the improved coil frame structure.

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