A stator assembly and electromagnetic pump applying the same

Abstract

A kind of stator assembly, its coil assembly includes coil former with sleeve and winding around the outer periphery of sleeve, sleeve has hollow hole, coil former has upper flange and lower flange at the axial both ends of sleeve and limit winding;Magnetic yoke installed on the outer periphery of coil assembly has upper and lower end plate respectively met with the flange of both ends of coil former;Magnetic sleeve is set in hollow hole both ends and contact with upper and lower end plate;Magnetic sleeve is double-layer structure by inner sleeve and outer sleeve, double-layer total thickness is (2.5-4) mm, magnetic yoke thickness is (2.5-4) mm, can economically and reliably use 2.5mm or more magnetic sleeve to improve magnetic conductivity, split thick magnetic sleeve into two thin magnetic sleeves, forming processing precision is high, not easy to deform.

Description

Technical Field

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

[0002] Currently, in related technologies, the thickness of the magnetic sleeve used in the stator assembly of the inlet solenoid valve coil does not exceed 2mm. It is usually made by rolling magnetic steel plates. Steel plates with a thickness of less than 2mm have high processing precision and do not affect the performance. When the magnetic sleeve is used in an electromagnetic pump and the electromagnetic attraction needs to be increased, the thickness of the yoke and the magnetic sleeve needs to be increased. The thickness of the yoke can be increased to more than 4mm without any problem of forming. However, when the thickness of the magnetic sleeve is increased to more than 2.5mm and it is formed by rolling steel plates, it is difficult to guarantee the processing precision and there may even be deformation problems.

[0003] On the other hand, the water inlet solenoid valve uses a plastic-sealed coil as an insert in the stator to integrally injection mold a water-separating tube to isolate the magnetic sleeve from the movable iron core, thereby minimizing the wall thickness to reduce the air gap and increase the electromagnetic attraction. This water-separating tube is used in the water inlet solenoid valve and does not need to bear a large tensile force. However, when used in an electromagnetic pump, the electromagnetic attraction is very large. This attraction is applied to the pump body end face through the main spring, causing the water-separating tube, which has a very thin wall connecting the two ends of the pump body, to easily break. To address this, grooves and through holes are provided on the end face and peripheral wall of the magnetic sleeve, respectively, so that the water-separating tube and the integrally formed cover are integrally formed with protrusions and inverted snaps embedded in the through holes and grooves, thereby sharing the elastic force borne by the water-separating tube.

[0004] However, the aforementioned through-holes and slots reduce the magnetic cross-section and lower the magnetic conductivity. Furthermore, when punching through-holes on the peripheral wall of a magnetic sleeve with a diameter of 2.5mm or more, the punch is prone to breakage if the inner diameter of the through-hole is less than 1.5mm; conversely, increasing the inner diameter of the through-hole reduces the magnetic conductivity.

[0005] 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"). Utility Model Content

[0006] The main objective of this invention is to provide a coil stator assembly that solves the technical problem of difficulty in processing and forming the magnetic sleeve using steel plates with a thickness of 2.5mm or more.

[0007] The technical solution of this utility model is: a stator assembly, comprising:

[0008] —A coil assembly, comprising a coil frame with a sleeve and windings surrounding the outer periphery of the sleeve, the sleeve having a hollow hole, and the coil frame having an upper flange and a lower flange at both axial ends of the sleeve for limiting the windings;

[0009] —Magnetic yoke, mounted on the outer periphery of the coil assembly, having an upper end plate and a lower end plate respectively facing the upper flange and the lower flange;

[0010] —Magnetic sleeve, fitted inside the hollow hole at both ends and in contact with the upper or lower end plate;

[0011] Its features are:

[0012] The magnetic sleeve is a double-layer structure consisting of an inner sleeve and an outer sleeve, with a total thickness of (2.5-4) mm. The thickness of the magnetic yoke is (2.5-4) mm.

[0013] In this way, magnetic sleeves with a thickness of 2.5mm or more can be reliably used to improve magnetic conductivity. Moreover, by splitting the thick magnetic sleeve into two thin magnetic sleeves, the forming and processing precision is high and it is not easy to deform.

[0014] Furthermore, the total thickness of the magnetic sleeve and the thickness of the magnetic yoke in the double-layer structure of the stator assembly can be the same, so as to improve the magnetic conductivity in an economical and reliable manner. The thickness of the inner sleeve and the outer sleeve can also be the same, so as to obtain better processing performance more economically.

[0015] An electromagnetic pump includes the aforementioned stator assembly and a pump body. The pump body includes a hollow tubular water-proof pipe and a water inlet at one end, the water-proof pipe being fitted into the inner wall of the magnetic sleeve; or,

[0016] —It also includes a pump body formed by injection molding with the above-mentioned stator assembly as an insert, the pump body including a hollow tubular water-proof pipe covering the inner wall of the magnetic sleeve and a water inlet at one end;

[0017] —The other end of the pump body is connected to a water outlet pipe with a water outlet, forming a coaxial pipeline from the water inlet to the water outlet. The pipeline is equipped with a first one-way valve assembly, a second one-way valve assembly, a hollow cylindrical movable iron core installed in the water-proof pipe, and a main spring axially arranged between the movable iron core and the water inlet. The connection area between the water outlet pipe and the pump body is sealed with a pump cover.

[0018] The typical design of this stator assembly is as follows:

[0019] The stator assembly also includes a plastic encapsulation shell covering the winding and at least covering the outer periphery of the yoke, having an upper end and a lower end covering at least a portion of the upper end plate and a portion of the lower end plate of the yoke, respectively; it also includes a pump body, which includes a hollow tubular water-proof tube covering the inner wall of the magnetic sleeve and a water inlet at one end, the end of the water-proof tube near the water inlet extending radially out of a cover;

[0020] The end face of the inner sleeve is provided with a first buckle groove, the end face of the outer sleeve is not provided with a buckle groove, the end face of the cover that faces the lower end plate of the magnetic yoke has an axial protrusion forming a first buckle, the first buckle is accommodated in the first buckle groove; the first buckle groove is preferably funnel-shaped, and the axial projection area S1 of the top opening is smaller than the axial projection area S2 of the bottom.

[0021] The inner sleeve has a through hole on its peripheral wall, while the outer sleeve does not have a through hole on its peripheral wall. A first protrusion is provided on the outer peripheral wall of the water-proof pipe, and the first protrusion is embedded in the through hole.

[0022] In this way, compared with using a single-layer thick magnetic sleeve, this utility model provides an anti-detachment part by setting an inverted buckle and a buckle groove between the inner sleeve and the cover, or by setting a through hole and a protrusion between the inner sleeve and the water-proof tube to share the spring force borne by the water-proof tube, which can effectively prevent the thin water-proof tube from breaking due to excessive spring force. At the same time, the outer sleeve does not have a buckle groove or a through hole, so the magnetic cross-section is not reduced, thus maximizing the magnetic conductivity. Furthermore, since the thickness of the inner sleeve is reduced, the punch of the stamping die can be reduced in size and is not easy to break. The size of the buckle groove and the through hole can also be reduced, which can further preserve the magnetic cross-section and better maintain the magnetic conductivity.

[0023] An electromagnetic pump includes a stator assembly of a typical design described above. The other end of the pump body is connected to an outlet pipe with a water outlet, forming a coaxial pipeline from the inlet to the outlet. The pipeline is equipped with a first one-way valve assembly, a second one-way valve assembly, a hollow cylindrical movable iron core installed in a water-proof pipe, and a main spring axially arranged between the movable iron core and the inlet. The connection area between the outlet pipe and the pump body is sealed with a pump cover.

[0024] 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

[0025] 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.

[0026] Figure 1 This is a three-dimensional structural diagram of the coil assembly in Embodiment 1 of this utility model;

[0027] Figure 2 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.

[0028] Figure 3 This is a cross-sectional view of the coil assembly containing a magnetic yoke and a magnetic sleeve in Embodiment 1 of this utility model;

[0029] Figure 4 This is an axial sectional view of the encapsulated coil assembly (i.e., stator assembly 90) of Embodiment 1 of this utility model;

[0030] Figure 5 This is a three-dimensional structural schematic diagram of the encapsulated coil assembly (i.e., stator assembly 90) of Embodiment 1 of this utility model;

[0031] Figure 6 This is a cross-sectional view of the stator assembly 90' with the pump body in Embodiment 2;

[0032] Figure 7 This is a three-dimensional structural diagram of the electromagnetic pump of this utility model;

[0033] Figure 8 This is an axial sectional view of the electromagnetic pump of this utility model;

[0034] Figure 9 yes Figure 8 A magnified view of a section at point I;

[0035] Figure 10 yes Figure 6 and Figure 8 A schematic diagram of the overall pump body;

[0036] Figure 11 yes Figure 10 Side view of the pump body;

[0037] Figure 12 yes Figure 3 A three-dimensional schematic diagram of the central magnetic sleeve;

[0038] Figure 13 yes Figure 12 An exploded view of the magnetic sleeve is shown.

[0039] Figure 14 yes Figure 12 A schematic diagram of the inner sleeve with the first snap groove and through hole is shown.

[0040] Figure 15 yes Figure 12The image shows a side view of the inner sleeve with a first snap groove and a through hole.

[0041] Figure label:

[0042] Plastic-encapsulated coil assembly 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, plastic-encapsulated shell 130, upper end 131, lower end 132, third through hole 1311, winding 140;

[0043] Pump body 20, water inlet 21, water baffle 22, cover 221, first protrusion 222;

[0044] Pump cover 30, water outlet pipe 31, water outlet 32, washer 40, first check valve assembly 50, movable iron core 60, second check valve assembly 70, main spring 80, pipeline 1, bolt 2;

[0045] Stator assembly 90 / 90', magnetic sleeve 91, inner sleeve 911, outer sleeve 912, through hole 913, magnetic sleeve positioning ring 92; first buckle groove 931, first buckle 932. Detailed Implementation

[0046] Embodiments 1 and 2 of this utility model are further improvements to the stator assembly in the prior application CN218818494U of 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 the embodiments of this application, 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 sleeve 91 described in the embodiments of this utility model, and the encapsulation layer described in CN218818494U is equivalent to the encapsulated shell 130 described in the embodiments of this utility model. Furthermore, the embodiments of this utility model replace the stator assembly used in the electromagnetic pump in the prior application CN221175888U of the inventors of this application with the stator assembly described in the embodiments of this application. 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.

[0047] The terms "center," "inner," "outer," "upper," "lower," "left," and "right" used in the text are based on Figure 4The orientation or positional relationship shown Figure 4 The center line is the central axis of the hollow hole 113 of the coil skeleton, that is, the center. "Upper" and "lower" can be interchanged, and "left" and "right" can be interchanged. The term "through hole" refers to a hole that penetrates the end or end plate of a part.

[0048] Embodiment 1

[0049] As Figure 1-5 As shown, first, the present invention discloses a stator assembly 90, which is also a plastic-encapsulated coil assembly 100. The plastic-encapsulated coil assembly 100 includes a coil skeleton 110, a yoke 120, and a plastic-encapsulated shell 130. The coil skeleton 110 includes a cylindrical sleeve 114 having a hollow hole 113, an upper flange 111 and a lower flange 112 extending radially outward along the axial two ends of the hollow hole 113. The coil winding 140 is wound around the outer periphery of the sleeve 114, and the upper flange 111 and the lower flange 112 limit the two ends of the winding 140 to form a coil assembly 101. The yoke 120 installed on the outer periphery of the coil assembly 101 as a whole shows a "mouth" shape in the longitudinal sectional view along the axis of the hollow hole 113 on the outer periphery of the coil assembly 101. The yoke 120 has an upper end plate 121 and a lower end plate 122 respectively facing the upper flange 111 and the lower flange 112 of the coil skeleton 110, and right side plates 123 and left side plates 124 that are parallel to each other and connect 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 axis. A central through hole 125 that is coaxially aligned with the hollow hole 113 and has a similar diameter is provided at the center of the lower end plate 122 of the yoke 120, and two through first through holes (threaded holes) 1211 are provided on the upper end plate 121. One cylindrical magnetic conduction sleeve 91, a magnetic conduction sleeve positioning ring 92, and another cylindrical magnetic conduction sleeve 91 are sequentially stacked and sleeved in the hollow hole 113. The inner peripheral surface of the hollow hole 113 and the outer peripheral surface of the magnetic conduction sleeve 91 are in transitional fit. The end surface of the first magnetic conduction sleeve 91 is in butt contact with the end surface of the yoke 120. The second magnetic conduction sleeve 91 exposes its outer peripheral surface at the lower end of the hollow hole 113 and contacts the inner peripheral surface of the central through hole 125 of the yoke 120.

[0050] The coil assembly 101 equipped with the yoke 120 and the magnetic conduction sleeve is used as an insert and placed into a mold, and plastic is injected to form the plastic-encapsulated shell 130. The plastic-encapsulated shell 130 covers the winding 140 and at least covers the outer periphery of the yoke 120 and respectively at least covers part of the upper end plate 121 and part of the lower end plate 122 of the yoke 120 to form an upper end portion 131 and a lower end portion 132 of the plastic-encapsulated shell 130. Two third through holes 1311 that penetrate the plastic-encapsulated shell 130 are formed at the positions of the upper end portion 131 corresponding to the two first through holes (threaded holes) 1211 of the yoke.

[0051] Among them, as Figure 3-4 、 Figure 12-13As shown, the magnetic sleeve 91 is a double-layer structure composed of an inner sleeve 911 and an outer sleeve 912, with a total thickness of 3mm. The thickness of the inner sleeve 911 and the outer sleeve 912 is evenly distributed, both being 1.5mm. They are made by rolling and forming magnetically conductive steel plates. The corresponding magnetic yoke 120 is designed with the same total thickness of the magnetic sleeve 91, also 3mm. This allows for a reliable use of a thicker magnetic sleeve to adapt to a thicker magnetic yoke, enhancing magnetic conductivity. By splitting the thick magnetic sleeve into two thinner magnetic sleeves, the forming and processing precision is high, and deformation is less likely. To achieve this, the preferred range for the total thickness of the double layer is (2.5-4)mm, and the preferred range for the thickness of the magnetic yoke is (2.5-4)mm. The thicknesses of the inner and outer sleeves can be evenly or unevenly distributed. When the total thickness of the magnetic sleeve is less than 2.5mm, stamping processes such as rolling the steel plate are easy, and the processing precision meets the requirements, eliminating the need to split the magnetic sleeve. When the total thickness of the magnetic sleeve and the thickness of the magnetic yoke exceed 4mm, the stamping process of the magnetic yoke becomes difficult and prone to deformation. Taking into account the performance of the stator assembly and the specifications of the raw materials, the preferred thicknesses are 3mm for the magnetic yoke 120, 3mm for the total thickness of the magnetic sleeve 91, and 1.5mm for both the inner sleeve 911 and the outer sleeve 912.

[0052] It should be noted that in this embodiment, the magnetic yoke in the stator assembly 90 is covered by the plastic encapsulation shell of the coil. Alternatively, the magnetic yoke can be installed after the coil is plastic encapsulated and then exposed. Furthermore, the coil can be left exposed without plastic encapsulation.

[0053] Example 2

[0054] like Figure 6 , Figure 10-15 As shown, the stator assembly 90' disclosed in this embodiment is a modified design of the stator assembly 90 of Embodiment 1. It is an assembly of the pump body 20 integrally injection molded with the stator assembly 90 of Embodiment 1 as an insert. Specifically, during the injection molding of the pump body, a hollow tubular water-proof tube 22 is formed on the inner wall of the magnetic sleeve 91, and a water inlet 21 is formed at one end of the pump body 20. The end of the water-proof tube 22 near the water inlet 21 extends radially to form a cover 221 that connects to the magnetic yoke 120 and / or the magnetic sleeve 91. The end face of the cover 221 facing the lower end plate 122 of the magnetic yoke 120 has an axially protruding first buckle 932. The end face of the inner sleeve 911 of the magnetic sleeve 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. The end face of the outer sleeve 912 is not provided with a buckle groove.

[0055] It should be noted that the first inverted buckle 932 is formed in the first buckle groove 931 during the injection molding of the pump body 20.

[0056] Understandably, the number of first buckle slots 931 can be set to multiple, and the number of first buckles 932 can also be set to the same number.

[0057] like Figure 14-15 As shown, the first groove 931 is trumpet-shaped, with an axial projected area of ​​S1 for the top opening and S2 for the bottom opening, and S1 <S2。

[0058] It should be noted that 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 inner sleeve 911.

[0059] like Figure 12-13 As shown, the inner sleeve 911 of the magnetic sleeve 91 has a through hole 913 on its peripheral wall, while the outer sleeve 912 does not have a through hole 913 on its peripheral wall. Figure 10-11 The outer peripheral wall of the water-proof pipe 22 shown is provided with a first protrusion 222 corresponding to the through hole 913, and the first protrusion 222 is embedded in the through hole 913.

[0060] 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.

[0061] It should be noted that the first protrusion 222 is formed within the through hole 913 during the injection molding of the pump body 20.

[0062] In other embodiments, the stator assembly 90' may also be a combination assembled with a separately injection-molded pump body 20. In this case, the water-proof tube 22 of the pump body 20 is fitted into the inner wall of the magnetic sleeve 91. The first snap groove 931 or through hole 913 on the inner sleeve layer 911 may or may not be retained. Furthermore, the installation of the magnetic sleeve 91 may be changed from before the coil is encapsulated to after the encapsulation.

[0063] Example 3

[0064] See Figure 7-9 This utility model also discloses an electromagnetic pump, including a stator assembly 90'. The other end of the pump body 20 is coaxially connected to the 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 on 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 provided with a first one-way valve assembly 50, a second one-way valve assembly 70, a hollow columnar 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 and limited by a pin in the first through hole 1211 of the magnetic yoke.

[0065] 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 a first buckle 932, and the first buckle 932 is housed in the first buckle groove 931, it can effectively prevent the thin water-proof pipe 22 from breaking due to excessive elastic force. The elastic force transmitted to the cover 221 can also be shared by the first protrusion 222 and the through hole 913. Moreover, the first protrusion 222 also enhances the strength of the water-proof pipe 22, thereby preventing the water-proof pipe 22 from breaking.

[0066] In this way, compared with using a single-layer thick magnetic sleeve, this utility model provides an anti-detachment part by setting an inverted buckle and a buckle groove between the inner sleeve and the cover, or by setting a through hole and a protrusion to share the spring force borne by the water-sealing pipe, which can effectively prevent the thin water-sealing pipe from breaking due to excessive spring force. At the same time, the outer sleeve does not have a buckle groove or a through hole, so the magnetic cross-section is not reduced, thus maximizing the magnetic conductivity. Furthermore, since the thickness of the inner sleeve is reduced, the punch of the stamping die can be reduced in size and is not easy to break. The size of the buckle groove and the through hole can also be reduced, which can further preserve the magnetic cross-section and better maintain the magnetic conductivity.

[0067] Since the axial projection area S1 of the top opening of the trumpet-shaped first buckle 931 is smaller than the axial projection area S2 of the bottom surface, the first buckle 932 is stuck in the first buckle 931. Therefore, the first buckle 932 is not easy to come out of the first buckle 931, thus better preventing the water-stopping pipe 22 from breaking.

[0068] In other embodiments, the electromagnetic pump can also take other forms, such as the one-piece molding of the outlet pipe and pump cover 30 described in CN221175888U, where an inner pipe is used instead of a gasket 40 to connect the pump body 20 and the outlet pipe, and a coaxial pipeline is formed between the inlet 21 and the outlet 32. Two sets of one-way valves, a movable iron core, and a main spring are installed in the pipeline as the pump's actuators. All of these fall within the protection scope of this utility model.

[0069] Except for the preferred improvements to the stator assembly, the stator assembly with pump body, or the encapsulated coil assembly, the structure of the other parts of the electromagnetic pump of this utility model is the same as that of the existing ones (see patent publication number CN221175888U, patent name is a coil assembly and an electromagnetic valve and electromagnetic pump using the coil assembly), and will not be described again here.

Claims

1. A stator assembly having: — A coil assembly (101) includes a coil frame (110) having a sleeve (114) and a winding (140) surrounding the outer periphery of the sleeve (114), the sleeve (114) having a hollow hole (113), and the coil frame (110) having an upper flange (111) and a lower flange (112) at both axial ends of the sleeve (114) to limit the winding (140); — A magnetic yoke (120) is installed on the outer periphery of the coil assembly (101) and has an upper end plate (121) and a lower end plate (122) respectively facing the upper flange (111) and the lower flange (112); —Magnetic sleeve (91) is fitted inside the hollow hole (113) at both ends and contacts the upper end plate (121) and the lower end plate (122); Its features are: The magnetic sleeve (91) is a double-layer structure consisting of an inner sleeve (911) and an outer sleeve (912), with a total thickness of (2.5-4) mm. The magnetic yoke (120) has a thickness of (2.5-4) mm.

2. The stator assembly according to claim 1, characterized in that: The total thickness of the magnetic sleeve (91) is the same as the thickness of the magnetic yoke (120).

3. The stator assembly according to claim 1, characterized in that: The inner sleeve (911) and the outer sleeve (912) have the same thickness.

4. The stator assembly according to claim 1, characterized in that: The thickness of the magnetic yoke (120) is 3 mm, the total thickness of the magnetic sleeve (91) is 3 mm, and the thickness of the inner sleeve (911) and the outer sleeve (912) is 1.5 mm.

5. The stator assembly according to any one of claims 1-4, characterized in that: —It also includes a plastic enclosure (130) covering the winding (140) and at least covering the outer periphery of the yoke (120), having an upper end (131) and a lower end (132) covering at least a portion of the upper end plate (121) and a portion of the lower end plate (122) of the yoke (120), respectively. —It also includes a pump body (20), which includes a hollow tubular water-proof tube (22) that covers the inner wall of the magnetic sleeve (91) and an inlet (21) at one end, wherein the end of the water-proof tube (22) near the inlet (21) extends radially out of a cover (221).

6. The stator assembly according to claim 5, characterized in that: The end face of the inner sleeve (911) is provided with a first buckle groove (931), and the end face of the cover (221) facing the lower end plate (122) of the magnetic yoke (120) is axially protruding to form a first buckle (932), which is accommodated in the first buckle groove (931).

7. The stator assembly according to claim 6, characterized in that: The first groove (931) is trumpet-shaped, and the axial projection area S1 of the top opening is smaller than the axial projection area S2 of the bottom.

8. The stator assembly according to claim 5, characterized in that: The inner sleeve (911) has a through hole (913) on its peripheral wall, and the water-proof pipe (22) has a first protrusion (222) on its outer peripheral wall, which is embedded in the through hole (913).

9. An electromagnetic pump, characterized in that: It includes a stator assembly as described in any one of claims 5-8, wherein the other end of the pump body (20) is connected to an outlet pipe (31) with an outlet (32) to form a coaxial pipeline (1) from the inlet (21) to the outlet (32), wherein 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) are provided in the pipeline; a pump cover (30) is sealed in the connection area between the outlet pipe (31) and the pump body (20).

10. An electromagnetic pump, characterized in that: It includes a stator assembly as described in any one of claims 1-4, and a pump body (20). The pump body (20) includes a hollow tubular water-proof tube (22) and an inlet (21) at one end. The water-proof tube is fitted into the inner wall of the magnetic sleeve (91). 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). 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 tube (22), and a main spring (80) axially arranged between the movable iron core (60) and the inlet (21). The connection area between the outlet pipe (31) and the pump body (20) is sealed with a pump cover (30).

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