A stator assembly and electromagnetic pump applying the same

Abstract

A kind of stator assembly and electromagnetic pump applying the stator assembly, stator assembly includes: coil assembly with hollow hole and winding, its upper and lower ends are provided with upper flange and lower flange for limiting the upper and lower ends of winding respectively;Magnetic yoke is installed on the outer periphery of coil assembly, with upper end plate above upper flange, lower end plate below lower flange and right side plate and left side plate connecting upper end plate and lower end plate;Magnetic conducting inner sleeve is sleeved in the both ends of hollow hole, and magnetic conducting inner sleeve at least exposes its outer peripheral surface below hollow hole;The lower end plate of magnetic yoke is provided with central through hole for sleeving magnetic conducting inner sleeve and being axially aligned with hollow hole and being similar in diameter;The lower end plate is divided into two parts by the opening of central through hole. Prevent the opening of magnetic yoke from being too large and leaking magnetic.

Description

Technical Field

[0001] This utility model relates to a stator assembly and an electromagnetic pump using the stator assembly. 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, a magnetic yoke located on the outside of the coil frame and the plastic casing, and a magnetically conductive inner sleeve fitted tightly within the central mounting hole of the coil frame and the magnetic yoke. This tight fit presents installation difficulties when using a U-shaped integral magnetic yoke. To further improve the structural reliability of the electromagnetic pump, the encapsulated coil winding needs to be encapsulated together with the magnetic yoke, which adds further difficulty to the installation of the magnetically conductive inner sleeve. Therefore, there is a need for improvement. Summary of the Invention

[0003] The purpose of this invention is to provide a stator assembly and an electromagnetic pump using the stator assembly, to solve the problems described in the background art, particularly the technical problem of inconvenient installation of the magnetic inner sleeve.

[0004] According to a first aspect of the present invention, a stator assembly includes:

[0005] 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.

[0006] The magnetic yoke (120) installed on the outer periphery of the coil assembly (101) has an upper end plate (121) above the upper flange (111), a lower end plate (122) below the lower flange (112), and a right side plate (123) and a left side plate (124) connecting the upper end plate (121) and the lower end plate (122).

[0007] A magnetic inner sleeve (91) is fitted inside both ends of the hollow hole (113), and the magnetic inner sleeve (91) is exposed on its outer peripheral surface at least at the lower end of the hollow hole (113).

[0008] The lower end plate (122) of the magnetic yoke (120) is provided with a central through hole (125) that is axially aligned with the hollow hole (113) and has a similar diameter for fitting the magnetic inner sleeve (91); the lower end plate (122) is divided into two parts by an opening (126) that passes through the central through hole (125).

[0009] Preferably, the lower end plate (122) has a second through hole (1221) on both sides of the opening (126).

[0010] further comprising a plastic enclosure (130) covering said winding (140) and covering at least part of the outer circumference of said yoke (120);

[0011] said plastic enclosure (130) has an upper end portion (131) covering at least a part of an upper end plate (121) of said yoke (120) and a lower end portion (132) covering at least a part of a lower end plate (122) of said yoke (120).

[0012] Preferably, a longitudinal sectional plane of said yoke (120) along the axis of said hollow hole (113) is in a shape of a Chinese character "kou" (meaning a square frame).

[0013] Preferably, the lower end portion of said plastic enclosure is provided with a fourth through hole on both sides of an opening respectively; in an axial projection along said hollow hole, a surface enclosed by the projection line of the contour of the fourth through hole at least partially overlaps with a surface enclosed by the projection line of the contour of the second through hole.

[0014] Preferably, said second through hole is used for limiting said lower end plate through a protruding portion of a mold during plastic encapsulation, and said fourth through hole is formed with said protruding portion of the mold as a core.

[0015] In this way, a yoke is arranged on the outer circumference of the coil bobbin on which the coil winding is wound, the yoke is limited at the flanges at both ends of the coil bobbin, and is placed into the mold during injection molding. At the end of the lower end plate, the mold is provided with a protruding portion inserted into the second through holes on both sides of the opening for limiting, which prevents high-pressure molten plastic from extruding the right side plate and the left side plate on both sides from the opening area during injection molding, which would cause the opening of the yoke to open excessively and lead to magnetic leakage.

[0016] Preferably, a plane passing through the axis of the central through hole and parallel to the right side plate is defined as a plane P, the distance from the edge of said second through hole close to the outer side of the lower end plate of the yoke to the plane P is a, and the distance from the edge of said fourth through hole close to the outer side of the lower end plate of the yoke to the plane P is b, then a ≥ b. In this way, the protruding portion of the mold is inserted into and abuts against the edge of the second through hole close to the plane P, which achieves a better effect of preventing the opening of the yoke from opening.

[0017] Preferably, the protruding portion of the mold is inserted into and presses the edge of the second through hole close to the plane P by means of providing a chamfer on its side surface, so that the second through holes on both sides of the opening approach towards the central opening direction, thereby narrowing the gap of the opening, and further enabling the central through hole of the yoke to be in close contact with the outer circumference of the magnetically conductive inner sleeve. The fit clearance between at least part of the surfaces between the outer circumference of the magnetically conductive inner sleeve and the central through hole is ≤ 0.10, so that the yoke has substantially no adverse effect of magnetic leakage and has good magnetic conductivity performance.

[0018] An opening is created through the central through-hole of the lower end plate of the magnetic yoke, allowing the slightly larger outer diameter magnetic inner sleeve to fit into the slightly smaller inner diameter central through-hole. Second through-holes are then created on both sides of the opening on the lower end plate. During plastic injection to form a plastic seal, a protrusion in the mold inserts into the second through-holes on both sides of the opening for limiting movement. This prevents the high-pressure molten plastic from being squeezed from the opening area towards the right and left side plates, causing the magnetic yoke opening to open too wide and resulting in excessive gap between the central through-hole and the outer circumferential surface of the magnetic inner sleeve, leading to magnetic leakage. Specifically, a chamfer is provided on the side of the mold protrusion near the edge of the two second through-holes close to plane P. During insertion, this chamfer forces the second through-holes on both sides of the opening towards the central opening, narrowing the gap and ensuring a tight fit between the central through-hole of the magnetic yoke and the outer circumference of the magnetic inner sleeve without magnetic leakage.

[0019] According to a second aspect of the present invention, 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 to the connection area between the water outlet tube and the pump body.

[0020] 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

[0021] 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.

[0022] Figure 1 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;

[0023] Figure 2 is a bottom view of the coil assembly with a magnetic yoke in the encapsulated coil assembly of Embodiment 1 of this utility model;

[0024] Figure 3 is a magnified view of section I in Figure 2;

[0025] Figure 4 is a three-dimensional structural diagram of the coil assembly with a magnetic yoke in the plastic-encapsulated coil assembly of Embodiment 1 of this utility model from two positions.

[0026] Figure 5 is a three-dimensional structural diagram of the encapsulated coil assembly in two positions according to Embodiment 1 of this utility model;

[0027] Figure 6 is an axial sectional view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0028] Figure 6A is a magnified view of section IIA in Figure 6;

[0029] Figure 7 is a magnified view of section II in Figure 6;

[0030] Figure 8 is a partial enlarged view of point III in Figure 6, illustrating the dimensional relationship between the second and fourth through holes in Embodiment 2;

[0031] Figure 9 is a top view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0032] Figure 10 is a bottom view of the encapsulated coil assembly of Embodiment 1 of this utility model;

[0033] Figure 11 is a partial enlarged view of position IV in Figure 9, showing the projection relationship between the first and third through holes along the axis of the hollow hole;

[0034] Figure 12 is a partial enlarged view of position IV in Figure 9, showing the projection relationship between the first through hole and the second through hole along the axis of the hollow hole;

[0035] Figure 13 is a partial enlarged view of position V in Figure 10, showing the projection relationship between the second and fourth through holes along the axis of the hollow hole;

[0036] Figure 14 is a cross-sectional view of the stator assembly of this utility model;

[0037] Figure 15 is a cross-sectional view of the coil assembly containing a magnetic yoke and a magnetic inner sleeve in the plastic-encapsulated coil assembly of this utility model.

[0038] Figure 16 is a cross-sectional schematic diagram of the pump body formed by insert injection molding of the stator assembly in Figure 14;

[0039] Figure 17 is a three-dimensional structural diagram of the electromagnetic pump of this utility model;

[0040] Figure 18 is an axial sectional view of the electromagnetic pump of this utility model;

[0041] Figure 19 is a magnified view of section VI in Figure 18;

[0042] Figure 20 is an overall schematic diagram of the pump body in Figure 18;

[0043] Figure 21 is a side view of the pump body in Figure 20;

[0044] Figure 22 is a schematic diagram of the overall magnetic yoke shown in Figure 4;

[0045] Figure 23 is an axial cross-sectional view of the magnetic yoke shown in Figure 22;

[0046] Figure 24 is a partial enlarged view of the magnetic yoke at position VII shown in Figure 23;

[0047] Figure 25 is an overall schematic diagram of the magnetic inner sleeve shown in Figure 14;

[0048] Figure 26 is a side view of the magnetic inner sleeve shown in Figure 25.

[0049] Reference numerals: 100, coil assembly, 101, coil frame, 110, upper flange, 111, lower flange, 112, hollow hole, 113, sleeve, 114, rib, 115, magnetic yoke, 120, upper end plate, 121, lower end plate, 122, right side plate, 123, left side plate, 124, central through hole, 125, opening, 126, first through hole (threaded hole) 1211, second through hole 1221, plastic seal 130, upper end 131, lower end 132, third through hole 1311, annular recess 1312, fourth through hole 1321, internal groove 133, 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 buckle 932. Detailed Implementation

[0050] This utility model embodiment is a further improvement on the stator assembly of the prior application CN218818494U by the inventors of this application. 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 prior application CN221175888U by 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.

[0051] The terms “center,” “inner,” “outer,” “upper,” “lower,” “left,” and “right” used in this text are based on the orientation or positional relationship shown in Figure 6. The center line in Figure 6 is the central axis of the hollow hole 113 in the coil frame, i.e., the center. “Upper” and “lower” can be interchanged, as can “left” and “right.” The term “through hole” refers to a hole that penetrates the end of a part or end plate.

[0052] Example 1

[0053] As shown in FIGS. 1-7 and 9-13, the present utility model discloses a molded coil assembly 100, comprising a coil assembly 101, a yoke 120 and a molded housing 130; the coil assembly 101 comprises a coil bobbin 110 having a cylindrical sleeve 114 with a hollow hole 113, a coil winding 140 wound around the outer circumference of the sleeve 114, and an upper flange 111 and a lower flange 112 extending radially outward at both ends of the sleeve 114, wherein the upper flange 111 and the lower flange 112 are configured to limit the two ends of the winding 140; the yoke 120 installed on the outer circumference of the coil assembly 101 is generally shaped like a Chinese character "kou" in a longitudinal cross-section along the axis of the hollow hole 113 at the outer circumference of the coil assembly 101. The yoke 120 has an upper end plate 121 located above the upper flange 111 of the coil bobbin 110, a lower end plate 122 located below the lower flange 112 of the coil bobbin 110, and a right side plate 123 and a left side plate 124 which are parallel to each other and axially connect the upper end plate 121 and the lower end plate 122 respectively at both ends of the outer circumference of the coil assembly 101. A central through hole 125 coaxially aligned with the hollow hole 113 and having a similar diameter to the hollow hole 113 is provided in the center of the lower end plate 122 of the yoke 120. Two through-going first through holes 1211 are provided on the upper end plate 121, and two through-going second through holes 1221 are provided on the lower end plate 122. A convex rib 115 is arranged in a closed loop on the upper end face of the upper flange 111 around the outer circumference of the first through hole 1211, and is in close contact with the lower end face of the upper end plate 121.

[0054] The coil assembly 101 provided with the yoke 120 is used as an insert, placed into a mold, and plastic is injected to form the molded housing 130, so as to obtain the molded coil assembly 100. The molded housing 130 covers the winding 140 and at least covers part of the outer circumference of the yoke 120, wherein the molded housing 130 at least covers part of the upper end plate 121 and part of the lower end plate 122 of the yoke 120 respectively to form an upper end portion 131 and a lower end portion 132 of the molded housing 130, and the upper end portion 131 forms two third through holes 1311 penetrating the molded housing 130 at positions corresponding to the two first through holes 1211 of the yoke,

[0055] the lower end portion 132 forms two fourth through holes 1321 penetrating the molded housing 130 at positions corresponding to the two second through holes 1221 of the yoke.

[0056] 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 face of the two first through holes 1211. The mold at one end of the opposite lower end plate 122 has a protrusion that passes through the two second through holes 1221 of the lower end plate 122 of the magnetic yoke and presses against the lower flange 112 of the coil frame. This forms a sufficient and stable clamping force at both ends of the first through holes 1211. The protrusion of the mold at one end of the upper end plate and the protruding rib 115 of the closed loop at the opposite end become a sealing part to prevent the high-pressure molten plastic from overflowing into both ends of the first through holes 1211 during injection molding. Projecting along the axis of the hollow hole 113 of the coil frame downwards to the end 132, as shown in Figures 11 and 13, 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 located 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.

[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 may be used instead. 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, when projected along the axial direction of the hollow hole 113, the surface enclosed by the projection lines of the first through hole 1211 and the surface enclosed by the projection lines 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 closely contacting the lower end surface of the upper end plate 121 is a convex rib 115 that is closed-loop arranged on the upper end surface of the upper flange 111 around the outer circumference of the first through hole 1211. 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 closely contact the lower end surface of the upper end plate 121 to form the sealing portion.

[0062] Figure 14 shows a stator assembly 90 of the present utility model, which includes the above-mentioned plastic-sealed coil assembly 100. One cylindrical magnetic conductive inner sleeve 91, a magnetic conductive sleeve positioning ring 92 and another cylindrical magnetic conductive inner sleeve 91 are successively 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 magnetic conductive inner sleeve 91. The end surface of the first magnetic conductive inner sleeve 91 is in butt contact with the end surface of the magnetic yoke 120. The outer peripheral surface of the second magnetic conductive inner 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] Embodiment 2

[0064] In the case of adopting a "square"-shaped integral magnetic yoke, in order to enable the central through hole of the magnetic yoke to maintain close fitting with the outer peripheral surface of the magnetic conductive inner sleeve so as to provide good magnetic conductivity, the following improved design of Embodiment 2 is further made.

[0065] As shown in Figures 2-6, 8, 10, and 13-15, 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 exposed magnetic inner sleeve 91 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. An opening 126 is made along the diameter direction of the central through hole 125, parallel to the right side plate 123 of the magnetic yoke, dividing the lower end plate 122 of the magnetic yoke into two parts. Two second through holes 1221 penetrating the lower end plate 122 are located at the opening 126. On both sides, the opening 126 can be opened 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 an axial core for the magnetic inner sleeve 91 to be fitted and positioned. The mold protrusion that passes through the two second through holes 1221 of the magnetic yoke to form two fourth through holes 1321 that penetrate the plastic seal 130 also has a limiting function, preventing the high-pressure molten plastic from being squeezed from the central area of ​​the magnetic yoke opening 126 toward 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. The projection of the fourth through hole 1321 onto the lower end 132 along the axis of the hollow hole 113 of the coil skeleton is shown in Figure 13. The surface enclosed by the projection line of the fourth through hole 1321 overlaps at least partially with the surface enclosed by the projection line of the second through hole 1221.

[0066] Let plane P be the plane that passes through the axis of the central through hole 125 and is 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 into and abuts against the edge of the second through hole 1221 near plane P, which is more effective in preventing the opening 126 of the yoke from opening.

[0067] When the mold protrusions near the edges of the two second through holes 1221 close to 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 good magnetic conductivity.

[0068] As long as the protrusion of the second through hole 1221 is set on the mold to prevent the opening from opening, it will work.

[0069] An opening 126 is formed along the diameter of the central through hole 125, which is parallel to the right side plate 123 of the magnetic yoke. The opening 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.

[0070] Example 3

[0071] As shown in Figures 16-19, this utility model also discloses an electromagnetic pump, including a pump body 20 integrally injection molded with the aforementioned stator assembly 90 as an insert. During injection molding, the pump body covers the inner wall of the magnetically conductive inner sleeve 91 to form a hollow tubular water-proof pipe 22, and an inlet 21 is formed at one end of the pump body 20. The other end of the pump body is coaxially connected to an outlet pipe 31 with an outlet 32. A gasket 40 is provided between the pump body 20 and the outlet pipe 31. A pump cover 30 is sealed to the outer periphery of one end of the outlet pipe 31 and the outer periphery of the water-proof pipe 22, thus forming 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 an axially arranged component between the movable iron core 60 and the inlet 21. The main spring 80 and pump cover 30 are fastened to the first through hole 1211 of the magnetic yoke with bolts 2 (when it is a threaded hole) or the pump body 20 is connected by a snap fastener and limited by a pin in the first through hole 1211 of the magnetic yoke.

[0072] As shown in Figures 18 and 20 to 26, an end of the water partition pipe 22 close to the water inlet 21 extends radially to form a cover portion 221 connected to the magnetic yoke 120 and / or the magnetically conductive inner sleeve 91, an end face of the cover portion 221 facing the lower end plate 122 of the magnetic yoke 120 is axially protruded to form a first reverse buckle 932, an end face of the lower end plate 122 and / or the magnetically conductive inner sleeve 91 is provided with a first buckling groove 931 corresponding to the first reverse buckle 932, and the first reverse buckle 932 is accommodated in the first buckling groove 931.

[0073] It can be understood that the first buckling groove 931 may be provided on the lower end plate 122 of the magnetic yoke 120 or the end face of the magnetically conductive inner sleeve 91, or both may be provided with the first buckling groove 931. When the movable iron core 60 is attracted, the main spring 80 is compressed, and the elastic force is applied to the cover portion 221 of the pump body 20. Since the first reverse buckle 932 is provided on the cover portion 221 and the first reverse buckle 932 is accommodated in the first buckling groove 931, the thin water partition pipe 22 can be effectively prevented from cracking due to excessive elastic force.

[0074] It can be understood that a plurality of first buckling grooves 931 can be provided, and the same number of first reverse buckles 932 are correspondingly provided. The greater the number of arrangements, the better the anti-drop performance of the water partition pipe 22, and the number of the first buckling grooves 931 and the first reverse buckles 932 is not specifically limited herein.

[0075] It should be noted that the first reverse buckle 932 is injection-molded in the first buckling groove 931 when the pump body 20 is formed by injection molding.

[0076] As shown in Figures 18 and 22 to 26, the first buckling groove 931 is trumpet-shaped, the axial projected area of the top opening thereof is S1, the axial projected area of the bottom thereof is S2, and S1<S2. It can be understood that when the movable iron core 60 is attracted, the compression elastic force of the main spring 80 is applied to the first reverse buckle 932 on the cover portion 221 and then transmitted to the magnetic yoke 120 and / or the magnetically conductive inner sleeve 91 where the first buckling groove 931 is located. Since the axial projected area S1 of the top opening is smaller than the axial projected area S2 of the bottom surface, the first reverse buckle 932 is clamped by the first buckling groove 931, so the first reverse buckle 932 is not easy to escape from the first buckling groove 931, thereby preventing the water partition pipe 22 from cracking.

[0077] It should be noted that if the first groove 931 is on the magnetic yoke 120, the axial projection area S2 at the bottom is the opening area at the bottom of the first groove 931; if the first groove 931 is on the magnetic inner sleeve 91, the axial projection area S2 at the bottom is the area of ​​the bottom surface of the first groove 931 formed on the end face of the magnetic inner sleeve 91.

[0078] As shown in Figures 14 to 18, the magnetic inner sleeve 91 includes an upper magnetic inner sleeve 911 and a lower magnetic inner sleeve 912. Through holes 913 are formed in the peripheral walls of both the upper and lower magnetic inner sleeves 911 and 912. A first protrusion 222 corresponding to the through hole 913 is provided on the outer peripheral wall of the water-proof pipe 22, and the first protrusion 222 is embedded in the through hole 913. Specifically, when the movable iron core 60 is attracted, the spring is compressed, and the cover 221 of the pump body 20 is subjected to axial elastic force. The elastic force transmitted to the cover 221 can be shared by the first protrusion 222 and the through hole 913. Furthermore, the first protrusion 222 also enhances the strength of the water-proof pipe 22, thereby preventing the water-proof pipe 22 from breaking.

[0079] Understandably, the number of vias 913 can be set to multiple, and the corresponding number of first protrusions 222 can also be set to the same number. The number of vias 913 and first protrusions 22 can be set as needed, and no specific limitation is made here.

[0080] It should be noted that the first protrusion 222 is formed by injection molding into the through hole 913 during the injection molding of the pump body 20.

[0081] As shown in Figures 5, 9, 18, 20, and 21, the plastic seal 130 has an upper end 131 and a lower end 132. An annular recess 1312 is provided at the upper end 131 near the outlet 32. An annular flange 223 extends radially from the end of the water inlet 21 and abuts against the upper end 131. An annular protrusion 2231 corresponding to the annular recess 1312 is provided on the annular flange 223. The annular protrusion 2231 is housed within the annular recess 1312. Specifically, when the movable iron core 60 is engaged, the main spring 80 compresses, generating an axial elastic force on the pump body 20. This elastic force is transmitted along the water inlet 22 to the annular protrusion 2231. Since the annular protrusion 2231 is housed and fastened within the annular recess 1312, it shares the load transmitted to the cover 221. Its elasticity further enhances its anti-hair loss effect.

[0082] As shown in Figures 5 and 10, the plastic casing 130 has an internal groove 133 and an external groove 134 on its peripheral wall. The internal groove 133 is located on the inner peripheral wall of the plastic casing 130, and the external groove 134 is located on the outer peripheral wall of the plastic casing 130. Since the electromagnetic pump requires a thermal protector, one of the two grooves can be selected for housing the thermal protector as needed.

[0083] 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. All of these fall within the protection scope of this utility model.

[0084] Except for preferred improvements to the stator assembly, stator assembly with pump body, or encapsulated coil assembly, the structure of the remaining parts of the electromagnetic pump of this utility model is the same as that of existing components (see patent publication number CN221175888U, patent title: A Coil Assembly and an Electromagnetic Valve and Electromagnetic Pump Using the Coil Assembly), and will not be repeated here. This utility model improves the injection molding processability of the electromagnetic pump stator assembly and encapsulated coil assembly and enhances the strength of the pump body by optimizing the structure of the stator assembly, stator assembly with pump body, or encapsulated coil assembly.

[0085] 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 stator assembly, comprising: a coil assembly (101) having a hollow hole (113) and a winding (140), wherein an upper flange (111) and a lower flange (112) are provided at the upper and lower ends of the coil assembly for limiting the upper and lower ends of the winding (140) respectively; a yoke (120) installed on the outer periphery of said coil assembly (101), comprising an upper end plate (121) located above said upper flange (111), a lower end plate (122) located below said lower flange (112), and a right side plate (123) and a left side plate (124) connecting the upper end plate (121) and the lower end plate (122); a magnetically conductive inner sleeve (91) sleeved at two ends in said hollow hole (113), wherein the outer peripheral surface of said magnetically conductive inner sleeve (91) is exposed at least at the lower end of the hollow hole (113); characterized in that: the lower end plate (122) of said yoke (120) is provided with a central through hole (125) which is used for sleeving said magnetically conductive inner sleeve (91), is axially aligned with said hollow hole (113) and has a diameter similar to that of the hollow hole (113); said lower end plate (122) is divided into two parts by an opening (126) passing through the central through hole (125).

2. The stator assembly according to claim 1, characterized in that: said lower end plate (122) is provided with second through holes (1221) at two sides of said opening (126); the stator assembly further comprises a plastic-encapsulated shell (130) covering said winding (140) and covering at least part of the outer periphery of said yoke (120); said plastic-encapsulated shell (130) has an upper end portion (131) covering at least part of the upper end plate (121) of said yoke (120) and a lower end portion (132) covering part of the lower end plate (122).

3. The stator assembly according to claim 2, characterized in that: said lower end portion (132) is respectively provided with fourth through holes (1321) at two sides of said opening (126), and when projected along the axial direction of said hollow hole (113), the surface enclosed by the projection line of the contour of said fourth through hole (1321) at least partially overlaps with the surface enclosed by the projection line of the contour of said second through hole (1221).

4. The stator assembly according to claim 3, characterized in that: a plane passing through the axis of the central through hole (125) and parallel to the right side plate (123) is defined as a plane P, the distance from the edge of said second through hole (1221) close to the outer side of the lower end plate (122) of the yoke to the plane P is a, and the distance from the edge of said fourth through hole (1321) close to the outer side of the lower end plate (122) of the yoke to the plane P is b, then a≥b is satisfied.

5. The stator assembly according to claim 1, characterized in that: the fit clearance between the outer periphery of said magnetically conductive inner sleeve (91) and the central through hole (125) on at least part of the surface is ≤0.

10.

6. The stator assembly according to claim 1, characterized in that: the longitudinal sectional view of said yoke (120) along the axis of said hollow hole (113) is in a "square" shape.

7. An electromagnetic pump, characterized in that: The pump body (20) is injection molded with the stator assembly (90) as an insert according to any one of claims 1 to 6. The pump body (20) includes a hollow tubular water-proof pipe (22) covering the inner wall of the magnetic inner sleeve (91) and a water inlet (21) at one end. The other end of the pump body (20) is connected to a water outlet pipe (31) with a water outlet (32), forming a coaxial pipeline (1) from the water inlet (21) to the water outlet (32). The pipeline is provided 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 water inlet (21). The connection area between the water outlet pipe (31) and the pump body (20) is sealed with a pump cover (30).

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