A plastic-coated coil assembly and a stator assembly and an electromagnetic pump having the same

Abstract

The utility model discloses a kind of plastic package coil assembly and the stator assembly and electromagnetic pump with it.The plastic package coil assembly includes coil assembly, magnetic yoke and plastic package shell;Coil assembly has hollow hole and winding, and upper flange and lower flange for respectively limiting the upper and lower ends of winding are equipped on its upper and lower ends;Magnetic yoke is installed on the outer periphery of coil assembly, and has upper end plate located on upper flange and lower end plate located on lower flange;Plastic package shell covers winding and at least covers the outer periphery of magnetic yoke, and has at least the upper end of upper end plate part covering the upper end of magnetic yoke and at least the lower end of lower end plate part covering the lower end of magnetic yoke;The upper end plate of magnetic yoke is equipped with first through hole, and the lower end plate is equipped with second through hole.The utility model solves the problem of magnetic yoke through-hole overflow glue when plastic package forming.

Description

Technical Field

[0001] This utility model relates to a plastic-encapsulated coil assembly, and also to a stator and electromagnetic pump having the plastic-encapsulated coil assembly, with IPC classification number F16K 31 / 06 or F04B 17 / 04 (2006.01). Background Technology

[0002] Existing encapsulated coil assemblies for electromagnetic pumps include: a coil frame, a coil winding surrounding a sleeve around the coil frame, a plastic casing covering the outer surface of the coil winding, inserts fixed to the coil frame, and a magnetic yoke located on the outside of the coil frame and the plastic casing. The magnetic yoke typically has mounting holes for connection to other parts of the electromagnetic pump or devices using the electromagnetic pump. To further improve the structural reliability of the electromagnetic pump, the encapsulated coil winding needs to be encapsulated together with the magnetic yoke. During injection molding, plastic can seep into the mounting holes of the magnetic yoke. Therefore, there is a need for improvement.

[0003] For relevant terms and knowledge, unless otherwise specified in this manual, please refer to the following: *Low Voltage Electrical Appliance Design Manual* (1st edition, 1992, Machinery Industry Press), *Valve Manual - Selection* (1st edition, 2013, Chemical Industry Press), *IEC Electrical and Electronic Standards Terminology Dictionary* (1st edition, 1992, China Standards Press), *Electrical Manufacturing Technology* (1st edition, 1982, Machinery Industry Press), *Mechanical Engineering Handbook*, and *Electrical Engineering Handbook* (1st edition, 1978 and 2nd edition, 1997, Machinery Industry Press), and Chinese patents CN218818494U ("A Coil Frame, Stator Assembly, and Inlet Solenoid Valve"), CN221175888U ("A Coil Assembly and Solenoid Valve and Solenoid Pump Using the Coil Assembly"), and CN111928007B ("Integrated Inlet Solenoid Valve and Implementation Method"). Summary of the Invention

[0004] To address the problems described in the background art, and particularly to solve the technical problem of adhesive overflow in through-holes in the prior art, this utility model provides a plastic-encapsulated coil assembly, a stator having the plastic-encapsulated coil assembly, and an electromagnetic pump.

[0005] According to a first aspect of the present invention, a plastic-encapsulated coil assembly includes:

[0006] A coil assembly with a hollow hole and windings has upper and lower flanges at its upper and lower ends for limiting the upper and lower ends of the windings, respectively.

[0007] A magnetic yoke, mounted on the outer periphery of the coil assembly, has an upper end plate located above the upper flange and a lower end plate located below the lower flange;

[0008] A plastic encapsulation shell covering the winding and at least the outer periphery of the yoke portion;

[0009] The plastic encapsulation shell has an upper end portion that covers at least a portion of the upper end plate of the magnetic yoke and a lower end portion that covers at least a portion of the lower end plate;

[0010] The upper end plate of the magnetic yoke is provided with a first through hole, and the lower end plate is provided with a second through hole.

[0011] Preferably, the plastic seal has an opening at a position relative to the first through hole for exposing the first through hole, and the plastic seal has an opening at a position relative to the second through hole for exposing the lower flange (112).

[0012] Preferably, the upper end of the plastic seal has a third through hole, and the lower end of the plastic seal has a fourth through hole; when projected along the axial direction of the hollow hole, the surface enclosed by the projection line of the third through hole near the outer side of the upper end plate exceeds and covers the surface enclosed by the projection line of the first through hole on the outer side of the upper end plate, and the surface enclosed by the projection line of the fourth through hole at least partially overlaps with the surface enclosed by the projection line of the second through hole.

[0013] A magnetic yoke is set on the outer periphery of the coil skeleton on which the coil is wound. The magnetic yoke is located at the flanges at both ends of the coil skeleton and is placed in a mold. At one end, the mold has a protrusion that presses against the outer edge of the magnetic yoke end plate of the first through hole. At the other end, the mold has a protrusion that passes through the through hole of the other end plate of the magnetic yoke and presses against the flange of the coil skeleton. This forms a sufficient and stable clamping force at both ends of the first through hole. Then, the plastic shell is formed by injection molding, which can prevent the molten plastic under high injection pressure from overflowing into the first through hole and avoid the problem of glue overflow in the first through hole.

[0014] Preferably, the upper end face of the upper flange is provided with a raised rib in a closed loop around the outer periphery of the first through hole, which is in contact with the lower end face of the upper end plate, thereby better preventing molten plastic from overflowing into the first through hole.

[0015] One further design is that the first through hole is a threaded hole or a round hole, and the third through hole is a round hole, with the inner diameter of the third through hole being larger than the inner diameter of the first through hole. For the threaded hole, there is no need to pre-install bolts during injection molding to prevent glue overflow; for the first through hole used for positioning, such as a round hole, the molding process is easier to control, allowing for a suitable increase in injection pressure without significant glue overflow.

[0016] The second further design is: when projecting along the axial direction of the hollow hole, the surface enclosed by the projection line of the first through hole contour and the surface enclosed by the projection line of the second through hole contour at least partially overlap, and the force application parts of the mold protrusions at both ends partially coincide and align, so as to better transmit the force to both ends of the first through hole and better prevent glue overflow.

[0017] Furthermore, the center lines of the first through hole and the second through hole are parallel.

[0018] Furthermore, the center lines of the first through hole and the second through hole are collinear, and the force-applying parts of the mold protrusions at both ends are completely aligned, so that the clamping force is transmitted directly to both ends of the first through hole, which maximizes the effect of preventing glue overflow.

[0019] A stator assembly includes a cylindrical magnetic inner sleeve and the aforementioned encapsulated coil assembly, wherein the magnetic inner sleeve is fitted at both ends of the hollow hole in the sleeve of the coil skeleton.

[0020] An electromagnetic pump includes a pump body injection molded with the aforementioned stator assembly as an insert. The pump body includes a hollow tubular water-proof tube covering the inner wall of the magnetic inner sleeve and a water inlet at one end. The other end of the pump body is connected to a water outlet tube with a water outlet, forming a coaxial pipeline from the water inlet to the water outlet. The pipeline is provided with a first one-way valve assembly, a second one-way valve assembly, a hollow cylindrical movable iron core installed in the water-proof tube, and a main spring axially arranged between the movable iron core and the water inlet. A pump cover is sealed in the connection area between the water outlet tube and the pump body. The pump cover is fastened to the first through hole (when it is a threaded hole) by bolts or by a pin limiting it in the first through hole.

[0021] The more specific design and technical effects of this utility model are further explained in conjunction with the accompanying drawings in the specific embodiments. Attached Figure Description

[0022] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0023] Figure 1 This is a three-dimensional structural diagram of the coil assembly in Embodiment 1 of this utility model and a partially enlarged diagram of position A;

[0024] Figure 2 This is a bottom view of the coil assembly with a magnetic yoke in the plastic-encapsulated coil assembly of Embodiment 1 of this utility model;

[0025] Figure 3 yes Figure 2 Local magnification in Figure I ;

[0026] Figure 4 This is a three-dimensional structural diagram of the coil assembly with a magnetic yoke in two orientations in Embodiment 1 of the present utility model.

[0027] Figure 5 This is a three-dimensional structural diagram of the encapsulated coil assembly in two orientations according to Embodiment 1 of this utility model;

[0028] Figure 6 This is an axial sectional view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0029] Figure 6A yes Figure 6 Local magnification in Figure II A;

[0030] Figure 7 yes Figure 6 Local magnification in Figure II ;

[0031] Figure 8 yes Figure 6 Local magnification in Figure III A diagram illustrating the dimensional relationship between the second and fourth through holes in Embodiment 2;

[0032] Figure 9 This is a top view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0033] Figure 10 This is a bottom view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0034] Figure 11 yes Figure 9 A partial enlarged view of position IV shows the projection relationship between the first and third through holes along the axis of the hollow hole.

[0035] Figure 12 yes Figure 9 A partial enlarged view of position IV shows the projection relationship between the first and second through holes along the axis of the hollow hole;

[0036] Figure 13 yes Figure 10 A partial enlarged view of position V shows the projection relationship between the second and fourth through holes along the axis of the hollow hole;

[0037] Figure 14 This is a cross-sectional view of the stator assembly of this utility model;

[0038] Figure 15 This is a cross-sectional view of a coil assembly containing a magnetic yoke and a magnetic inner sleeve in a plastic-encapsulated coil assembly of this utility model.

[0039] Figure 16 yes Figure 14 A cross-sectional view of the pump body formed by insert injection molding of the stator assembly;

[0040] Figure 17 This is a three-dimensional structural diagram of the electromagnetic pump of this utility model;

[0041] Figure 18 This is an axial sectional view of the electromagnetic pump of this utility model;

[0042] Figure 19 yes Figure 18 Local magnification in Figure VI ;

[0043] Figure 20 yes Figure 18 A schematic diagram of the overall pump body;

[0044] Figure 21 yes Figure 20 Side view of the pump body;

[0045] Figure 22 yes Figure 4 A schematic diagram of the overall magnetic yoke is shown;

[0046] Figure 23 yes Figure 22 An axial cross-sectional view of the magnetic yoke is shown.

[0047] Figure 24 yes Figure 23 A partially enlarged view VII of the magnetic yoke is shown;

[0048] Figure 25 yes Figure 14 The diagram shows the overall design of the magnetically conductive inner sleeve.

[0049] Figure 26 yes Figure 25 The side view of the magnetic inner sleeve is shown.

[0050] Reference numerals: 100, coil assembly, coil frame, upper flange, lower flange, hollow hole, sleeve, rib, magnetic yoke, upper end plate, lower end plate, right side plate, left side plate, central through hole, opening, first through hole (threaded hole), second through hole, plastic encapsulation shell, upper end, lower end, third through hole, annular recess, fourth through hole, internal groove. 3. External groove 134, winding 140; pump body 20, water inlet 21, water-proof pipe 22, cover 221, first protrusion 222, annular flange 223, annular protrusion 2231; pump cover 30, water outlet pipe 31, water outlet 32, washer 40, first one-way valve assembly 50, movable iron core 60, second one-way valve assembly 70, main spring 80, pipeline 1, bolt 2; stator assembly 90, magnetic inner sleeve 91, upper magnetic inner sleeve 911, lower magnetic inner sleeve 912, through hole 913, magnetic sleeve positioning ring 92; first buckle groove 931, first inverted buckle 932. Detailed Implementation

[0051] This utility model embodiment is a further improvement on the stator assembly of the inventor's prior application CN218818494U. The main design change is that the upper magnetic inner sleeve, the magnetic sleeve positioning ring, and the lower magnetic inner sleeve are not inserts for injection molding the coil frame, but rather inserts for injection molding the encapsulated coil assembly described in this application embodiment, or parts further assembled after injection molding the encapsulated coil assembly. The upper and lower magnetic inner sleeves described in CN218818494U are equivalent to the magnetic inner sleeve 91 described in this utility model embodiment, and the encapsulation layer described in CN218818494U is equivalent to the encapsulated shell 130 described in this utility model embodiment. Furthermore, this utility model embodiment replaces the stator assembly used in the electromagnetic pump of the inventor's prior application CN221175888U with the stator assembly described in this application embodiment. The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0052] The terms "center," "inner," "outer," "upper," "lower," "left," and "right" used in the text are based on Figure 6 The indicated orientation or positional relationship Figure 6 The centerline is the central axis of the hollow hole 113 in the coil skeleton, i.e., the center. "Up" and "down" can be interchanged, as can "left" and "right". The term "through hole" refers to a hole that passes through the end of a part or end plate.

[0053] A first embodiment of this utility model is as follows: Figure 1-7 , Figure 9-13As shown. A plastic-encapsulated coil assembly 100 includes a coil assembly 101, a magnetic yoke 120, and a plastic encapsulation shell 130; the coil assembly 101 includes a coil skeleton 110 with a cylindrical sleeve 114 having a hollow hole 113, a coil winding 140 surrounding the outer periphery of the sleeve 114, and an upper flange 111 and a lower flange 112 extending radially outward from both ends of the sleeve 114, the upper flange 111 and the lower flange 112 being used to close or cover both ends of the winding 140; the magnetic yoke 120, which is mounted on the outer periphery of the coil assembly 101, is shaped like a "U" in longitudinal section along the axis of the hollow hole 113 on the outer periphery of the coil assembly 101, and the magnetic yoke 120 has a coil skeleton 101, a magnetic yoke 120, and a plastic encapsulation shell 130 respectively. The upper flange 111 and lower flange 112 of the coil assembly 10 have an upper end plate 121 and a lower end plate 122 facing each other, and a right side plate 123 and a left side plate 124 that are parallel to each other and connected to the upper end plate 121 and the lower end plate 122 at both ends of the outer periphery of the coil assembly 101 along the axial direction. The lower end plate 122 of the magnetic yoke 120 has a central through hole 125 that is coaxially aligned with the hollow hole 113 and has a similar diameter. The upper end plate 121 has two through first through holes 1211, and the lower end plate 122 has two through second through holes 1221. The upper end face of the upper flange 111 is provided with a rib 115 that is in close contact with the lower end face of the upper end plate 121 in a closed loop around the outer periphery of the first through hole 1211.

[0054] The coil assembly 101 with the yoke 120 is placed into a mold as an insert, and plastic is injected to form a plastic-sealed shell 130, thus producing the plastic-sealed coil assembly 100. The plastic-sealed shell 130 covers the winding 140 and at least covers part of the outer periphery of the yoke 120. The plastic-sealed shell 130 covers at least part of the upper end plate 121 and part of the lower end plate 122 of the yoke 120, forming the upper end portion 131 and the lower end portion 132 of the plastic-sealed shell 130. The upper end portion 131 forms two third through holes 1311 through the plastic-sealed shell 130 at the positions corresponding to the two first through holes 1211 of the yoke. The lower end portion 132 forms two fourth through holes 1321 through the plastic-sealed shell 130 at the positions corresponding to the two second through holes 1221 of the yoke.

[0055] During injection molding, the mold at one end of the upper end plate 121 has a protrusion that presses against the upper end plate of the magnetic yoke at the outer edge of the end faces of the two first through holes 1211. The mold at the opposite end of the lower end plate 122 has a protrusion that passes through the two second through holes 1221 of the lower end plate 122 and presses against the lower flange 112 of the coil frame. This creates a sufficient and stable clamping force at both ends of the first through holes 1211. The protrusion at the upper end plate and the closed-loop rib 115 at the opposite end form a seal to prevent high-pressure molten plastic from overflowing into both ends of the first through holes 1211 during injection molding. Projecting downwards along the axis of the hollow hole 113 of the coil frame to the lower end 132, as shown... Figure 11 , Figure 13As shown, the surface enclosed by the projection lines of the third through hole 1311 near the outer side of the upper end plate 121 extends beyond and covers the surface enclosed by the projection lines of the first through hole 1211 located on the outer side of the upper end plate 121, and the surface enclosed by the projection lines of the fourth through hole 1321 at least partially overlaps with the surface enclosed by the projection lines of the second through hole 1221.

[0056] Here, as long as the plastic seal 130 has an opening for exposing the first through hole 1211 at a position relative to the first through hole 1211, one mold protrusion can press against the first through hole 1211 to become a sealing part. The plastic seal 130 has an opening for exposing the lower flange 112 at a position relative to the second through hole 1221, so that another mold protrusion can press against the lower flange 112 to form a locking force at both ends of the first through hole 1211.

[0057] In this embodiment, the first through hole 1211 is a threaded hole, and the third through hole 1311 is a round hole. The inner diameter of the third through hole 1311 is larger than the inner diameter of the first through hole 1211. The structure of this embodiment does not require pre-installing bolts during injection molding to prevent glue overflow from the threaded holes. The injection molding process for plastic sealing is easy to control, and the injection pressure can be appropriately increased without easily causing glue overflow.

[0058] In other embodiments, the first through hole 1211 may not be a threaded hole, but a round hole, an elliptical hole, a square hole and various irregular holes. When projected along the axial direction of the hollow hole 113, as long as the surface enclosed by the projection line of the third through hole 1311 near the outer side of the upper end plate 121 exceeds and covers the surface enclosed by the projection line of the first through hole 1211 located on the outer side of the upper end plate 121, it can effectively prevent excess glue from entering the first through hole 1211.

[0059] Furthermore, in order to better transmit the clamping force to both ends of the first through hole and to better prevent glue overflow, such as Figure 12 As shown, by projecting along the axial direction of the hollow hole 113, the surface enclosed by the projection line of the first through hole 1211 and the surface enclosed by the projection line of the second through hole 1221 can at least partially overlap; furthermore, the center lines of the first through hole 1211 and the second through hole 1221 are parallel.

[0060] Furthermore, the center lines of the first through hole 1211 and the second through hole 1221 are collinear, and the force application parts of the mold protrusions at both ends are completely aligned, so that the clamping force is transmitted directly to both ends of the first through hole, which has the best effect in preventing glue overflow.

[0061] In this embodiment, the sealing portion that is in close contact with the lower end surface of the upper end plate 121 is a convex rib 115 that is closed-loop arranged around the outer periphery of the first through hole 1211 on the upper end surface of the upper flange 111. On the premise that the convex rib 115 is arranged in a closed loop around the first through hole 1211, the convex rib 115 can also be enlarged into a convex boss. In other embodiments, when the convex rib 115 is not provided, the upper end surface of the upper flange 111 can also be in close contact with the lower end surface of the upper end plate 121 to form the sealing portion.

[0062] Figure 14 shows the stator assembly 90 of the present utility model, which includes the above-mentioned plastic-encapsulated coil assembly 100. One cylindrical inner magnetic conduction sleeve 91, a magnetic conduction sleeve positioning ring 92 and another cylindrical inner magnetic conduction sleeve 91 are sequentially stacked and sleeved in the hollow hole 113. The inner peripheral surface of the hollow hole 113 is transition-fitted with the outer peripheral surface of the inner magnetic conduction sleeve 91. The end surface of the first inner magnetic conduction sleeve 91 is in butt contact with the end surface of the magnetic yoke 120, and the outer peripheral surface of the second inner magnetic conduction sleeve 91 exposed at the lower end of the hollow hole 113 is in contact with the inner peripheral surface of the central through hole 125 of the magnetic yoke 120.

[0063] The second embodiment of the present utility model is Figure 2-6 , Figure 8 , Figure 10 , Figure 13-15 shown. In the case of adopting a "square"-shaped integrated magnetic yoke, in order to enable the central through hole of the magnetic yoke to keep close fit with the outer peripheral surface of the inner magnetic conduction sleeve so as to provide good magnetic conduction performance, the improved design of the second embodiment is further carried out as follows.

[0064] Compared to the stator assembly in Embodiment 1, Embodiment 2 of this utility model differs in that the magnetic inner sleeve 91 and the magnetic sleeve positioning ring 92 are installed inside the hollow hole 113 at least before the injection molding of plastic to form the plastic seal 130. Furthermore, to ensure close contact between the outer peripheral surface of the magnetic inner sleeve 91 exposed at the lower end of the hollow hole 113 and the inner peripheral surface of the central through hole 125 of the magnetic yoke 120, the outer peripheral diameter of the magnetic inner sleeve 91 is designed to be slightly larger than the inner peripheral diameter of the central through hole 125. This design extends along the right side plate of the magnetic yoke. The central through hole 125 parallel to 123 has an opening 126 in the diameter direction, which splits the lower end plate 122 of the magnetic yoke into two parts. The two second through holes 1221 penetrating the lower end plate 122 are located on both sides of the opening 126. In this way, the opening 126 can be pried open manually or with a tooling fixture, and the magnetic inner sleeve 91 with a slightly larger outer diameter can be inserted into the central through hole 125 of the magnetic yoke with a slightly smaller inner diameter. When the fixture is released, the opening 126 automatically springs back and closes the central through hole 125 to clamp the outer circumference of the magnetic inner sleeve 91. When the plastic is injected to form the plastic seal 130, the mold is provided with a shaft-shaped core for the magnetic inner sleeve 91 to be fitted and positioned. The mold protrusions that pass through the two second through holes 1221 of the magnetic yoke to form two fourth through holes 1321 penetrating the plastic seal 130 also have a limiting function, preventing the high-pressure molten plastic from being squeezed from the central area of ​​the magnetic yoke opening 126 towards the right side plate 123 and the left side plate 124, causing the magnetic yoke opening 126 to open too large and increase magnetic leakage. Projecting downwards to the lower end 132 along the axis of the hollow hole 113 of the coil frame, such as... Figure 13 As shown, the surface enclosed by the projection lines of the fourth through hole 1321 overlaps at least partially with the surface enclosed by the projection lines of the second through hole 1221.

[0065] Let plane P be the plane passing through the axis of the central through hole 125 and parallel to the right side plate 123 of the yoke. Let a be the distance from the edge of the second through hole 1221 near the outer side of the lower end plate 122 of the yoke to plane P. Let b be the distance from the edge of the fourth through hole 1321 near the outer side of the lower end plate 122 of the yoke to plane P. Then a≥b. The mold protrusion is inserted and abuts against the edge of the second through hole 1221 near plane P, preventing the yoke opening 126 from opening.

[0066] When the mold protrusions on the sides of the two second through holes 1221 near the edge of the plane P are chamfered, the two second through holes 1221 can be squeezed towards the central opening 126 during insertion, thereby narrowing the gap of the opening. This reduces the mating gap between at least part of the surface between the central through hole 125 of the magnetic yoke and the outer peripheral surface of the magnetic inner sleeve 91 to ≤0.10, with virtually no adverse effects of magnetic leakage, and exhibits good magnetic conductivity.

[0067] The opening 126, which is opened along the diameter direction of the central through hole 125 parallel to the right side plate 123 of the magnetic yoke, can be in any direction. The two sections of the opening on both sides of the central through hole 125 can each be in two directions with an included angle. The shape of the opening can be serrated, stepped, or any other shape, as long as it can pass through the central through hole 125 and split the lower end plate into two parts.

[0068] For example, the third embodiment of this utility model Figure 16-19 As shown, an electromagnetic pump includes a pump body 20 integrally injection molded with the aforementioned stator assembly 90 as an insert. During injection molding, the pump body encloses the inner wall of a magnetically conductive inner sleeve 91 to form a hollow tubular water-proof tube 22 and an inlet 21 at one end of the pump body 20. The other end of the pump body is coaxially connected to an outlet pipe 31 having an outlet 32. A gasket 40 is provided between the pump body 20 and the outlet pipe 31. A pump cover 30 is fitted onto the outer periphery of one end of the outlet pipe 31 and the outer periphery of the water-proof tube 22. This forms a coaxial pipeline 1 from the inlet 21 to the outlet 32. The pipeline 1 is sequentially equipped with a first one-way valve assembly 50, a second one-way valve assembly 70, a hollow cylindrical movable iron core 60 installed in the water-proof pipe 22, and a main spring 80 axially arranged between the movable iron core 60 and the inlet 21. The pump cover 30 is fastened to the first through hole 1211 of the magnetic yoke with bolts 2 (when it is a threaded hole) or connected to the pump body 20 by a snap fastener and limited by a pin in the first through hole 1211 of the magnetic yoke.

[0069] like Figure 18 , 20 As shown in Figure 26, the end of the water-proof pipe 22 near the water inlet 21 extends radially to form a cover 221 that connects to the magnetic yoke 120 and / or the magnetic inner sleeve 91. The end face of the cover 221 facing the lower end plate 122 of the magnetic yoke 120 has an axial protrusion forming a first buckle 932. The end face of the lower end plate 122 and / or the magnetic inner sleeve 91 is provided with a first buckle groove 931 corresponding to the first buckle 932. The first buckle 932 is accommodated in the first buckle groove 931.

[0070] Understandably, the first snap groove 931 can be provided on the lower end plate 122 of the magnetic yoke 120 or the end face of the magnetic inner sleeve 91, or both can have the first snap groove 931 provided. When the movable iron core 60 is attracted, the main spring 80 is compressed, and the elastic force is applied to the cover 221 of the pump body 20. Since the cover 221 is provided with the first buckle 932, and the first buckle 932 is housed in the first snap groove 931, it can effectively prevent the thin water-proof pipe 22 from breaking due to excessive elastic force.

[0071] It is understandable that a plurality of first engaging grooves 931 can be provided, and the same number of first inverse buckles 932 are correspondingly provided. The greater the number provided, the better the anti-disengagement performance of the water isolation pipe 22. The number of the first engaging grooves 931 and the first inverse buckles 932 is not specifically limited herein. It should be noted that the first inverse buckles 932 are injection-molded into the first engaging grooves 931 when the pump body 20 is formed by injection molding.

[0072] As shown in Figure 18 , 22 to 26, the first engaging groove 931 is trumpet-shaped, the axial projection area of the top opening thereof is S1, the axial projection area of the bottom thereof is S2, and S1 < S2. It can be understood that when the movable iron core 60 is attracted, the compressed elastic force of the main spring 80 is applied to the first inverse buckle 932 of the cover portion 221 and then transmitted to the yoke 120 and / or the magnetically conductive inner sleeve 91 where the first engaging groove 931 is located. Since the axial projection area S1 of the top opening is smaller than the axial projection area S2 of the bottom surface, the first inverse buckle 932 is clamped by the first engaging groove 931, so the first inverse buckle 932 is not easy to disengage from the first engaging groove 931, thereby preventing the water isolation pipe 22 from cracking.

[0073] It should be noted that if the first engaging groove 931 is provided on the yoke 120, the axial projection area S2 of the bottom is the opening area of the bottom end of the first engaging groove 931; if the first engaging groove 931 is provided on the magnetically conductive inner sleeve 91, the axial projection area S2 of the bottom is the area of the bottom surface of the first engaging groove 931 formed on the end surface of the magnetically conductive inner sleeve 91.

[0074] As shown in Figures 14 to 18 , the magnetically conductive inner sleeve 91 comprises an upper magnetically conductive inner sleeve 911 and a lower magnetically conductive inner sleeve 912, through holes 913 are opened on the peripheral walls of the upper magnetically conductive inner sleeve 911 and the lower magnetically conductive inner sleeve 912, first protrusions 222 corresponding to the through holes 913 are provided on the outer peripheral wall of the water isolation pipe 22, and the first protrusions 222 are embedded in the through holes 913. Specifically, when the movable iron core 60 is attracted, the spring is compressed, the cover portion 221 of the pump body 20 receives axial elastic force, the elastic force transmitted to the cover portion 221 can be shared through the first protrusions 222 and the through holes 913, and the first protrusions 222 also enhance the strength of the water isolation pipe 22 at the same time, thereby preventing the water isolation pipe 22 from breaking.

[0075] It is understandable that a plurality of through holes 913 can be provided, and the same number of corresponding first protrusions 222 are also provided. The number of the through holes 913 and the first protrusions 22 can be set as required, and is not specifically limited herein.

[0076] It should be noted that the first protrusions 222 are formed by injection molding into the through holes 913 when the pump body 20 is formed by injection molding.

[0077] As shown in Figure 5 , 9As shown in Figures 18, 20, and 21, the plastic seal 130 has an upper end 131 and a lower end 132. The upper end 131 of the plastic seal 130 near the water outlet 32 ​​is provided with an annular recess 1312. The water-proof tube 22 extends radially from the end away from the water inlet 21, and an annular flange 223 abuts against the upper end 131. The annular flange 223 is provided with an annular protrusion 2231 corresponding to the annular recess 1312. The annular protrusion 2231 is accommodated in the annular recess 1312. Specifically, when the movable iron core 60 is attracted, the main spring 80 is compressed and generates an axial elastic force on the pump body 20. The elastic force is transmitted along the water-proof tube 22 to the annular protrusion 2231. Since the annular protrusion 2231 is accommodated and fastened in the annular recess 1312, it shares the elastic force transmitted to the cover 221, thereby further improving the anti-detachment effect.

[0078] like Figure 5 , 10 As shown, the plastic seal 130 has an inner groove 133 and an outer groove 134 on its peripheral wall. The inner groove 133 is located on the inner peripheral wall of the plastic seal 130, and the outer groove 134 is located on the outer peripheral wall of the plastic seal 130. Since the electromagnetic pump requires a thermal protector, one of the two grooves can be selected for housing the thermal protector as needed.

[0079] Electromagnetic pumps can also take other forms, such as the one-piece molding of the outlet pipe and pump cover 30 described in CN221175888U, which uses an inner tube instead of a gasket 40 to connect the pump body 20 and the outlet pipe, forming a coaxial pipeline between the inlet 21 and the outlet 32, and installing two sets of one-way valves, a movable iron core, and a main spring in the pipeline as the pump's actuator.

[0080] Except for the preferred improvements to the stator assembly, the stator assembly with pump body, or the encapsulated coil assembly, the structure of the remaining parts of the electromagnetic pump of this utility model is the same as that of the existing ones (see patent publication number CN221175888U, patent title: A Coil Assembly and an Electromagnetic Valve and Electromagnetic Pump Using the Coil Assembly), which will not be described again here. This utility model improves the injection molding processability of the electromagnetic pump stator assembly and the encapsulated coil assembly and strengthens the pump body by optimizing the structure of the stator assembly, the stator assembly with pump body, or the encapsulated coil assembly.

[0081] Although the present invention has been described in detail above, it is not limited thereto. Those skilled in the art can make various modifications based on the principles of the present invention. Therefore, all modifications made in accordance with the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims

1. A plastic-encapsulated coil assembly, comprising: A coil assembly (101) having a hollow hole (113) and a winding (140) has an upper flange (111) and a lower flange (112) at its upper and lower ends for limiting the upper and lower ends of the winding (140) respectively. The magnetic yoke (120), mounted on the outer periphery of the coil assembly (101), has an upper end plate (121) above the upper flange (111) and a lower end plate (122) below the lower flange (112). A plastic encapsulation shell (130) covering the winding (140) and at least covering a portion of the outer periphery of the yoke (120). The feature is that the plastic seal (130) has an upper end (131) that covers at least a portion of the upper end plate (121) of the magnetic yoke (120) and a lower end (132) that covers at least a portion of the lower end plate (122). The upper end plate (121) of the magnetic yoke (120) is provided with a first through hole (1211), and the lower end plate (122) is provided with a second through hole (1221).

2. The encapsulated coil assembly according to claim 1, characterized in that: The plastic seal (130) has an opening at a position relative to the first through hole (1211) for exposing the first through hole (1211), and the plastic seal (130) has an opening at a position relative to the second through hole (1221) for exposing the lower flange (112).

3. The encapsulated coil assembly according to claim 2, characterized in that: The upper end (131) of the plastic seal (130) has a third through hole (1311), and the lower end (132) has a fourth through hole (1321). When projected along the axial direction of the hollow hole (113), the surface enclosed by the projection line of the third through hole (1311) near the outer side of the upper end plate (121) extends beyond and covers the surface enclosed by the projection line of the first through hole (1211) on the outer side of the upper end plate (121). The surface enclosed by the projection line of the fourth through hole (1321) at least partially overlaps with the surface enclosed by the projection line of the second through hole (1221).

4. The encapsulated coil assembly according to any one of claims 1-3, characterized in that: The upper end face of the upper flange (111) is provided with a raised rib (115) in a closed loop around the outer periphery of the first through hole (1211), which is in contact with the lower end face of the upper end plate (121).

5. The encapsulated coil assembly according to claim 3, characterized in that: The first through hole (1211) is a threaded hole or a round hole, and the third through hole (1311) is a round hole. The inner diameter of the third through hole (1311) is larger than the inner diameter of the first through hole (1211).

6. The encapsulated coil assembly according to any one of claims 1-3, characterized in that: Projecting along the axial direction of the hollow hole (113), the surface enclosed by the projection line of the first through hole (1211) contour at least partially overlaps with the surface enclosed by the projection line of the second through hole (1221) contour.

7. The encapsulated coil assembly according to any one of claims 1-3, characterized in that: The center lines of the first through hole (1211) and the second through hole (1221) are parallel.

8. The encapsulated coil assembly according to any one of claims 1-3, characterized in that: The center lines of the first through hole (1211) and the second through hole (1221) are collinear.

9. A stator assembly (90), characterized in that: It includes a cylindrical magnetic inner sleeve (91) and a plastic-encapsulated coil assembly as described in any one of claims 1 to 8, wherein the magnetic inner sleeve (91) is sleeved at both ends of the hollow hole (113).

10. An electromagnetic pump, characterized in that: It includes a pump body (20) injection molded with the stator assembly (90) of claim 9 as an insert. The pump body (20) includes a hollow tubular water-proof pipe (22) covering the inner wall of the magnetic inner sleeve (91) and an inlet (21) at one end. The other end of the pump body (20) is connected to an outlet pipe (31) with an outlet (32), forming a coaxial pipeline (1) from the inlet (21) to the outlet (32). A first one-way valve is provided in the pipeline. The components include (50), a second one-way valve assembly (70), a hollow cylindrical movable iron core (60) installed in the water-proof pipe (22), and a main spring (80) axially arranged between the movable iron core (60) and the water inlet (21); the connection area between the water outlet pipe (31) and the pump body (20) is sealed with a pump cover (30), which is fastened to the first through hole (1211) by bolts or by pins.

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