Electromagnetic pump

Abstract

The invention discloses an electromagnetic pump which comprises a main pipe, a coil assembly and a retainer, the coil assembly is arranged outside the main pipe in a sleeving mode, the retainer is fixed outside the coil assembly, the retainer is used for conducting magnetism outside the coil assembly, two opposite through holes are formed in the retainer, and the main pipe penetrates through the through holes. The coil assembly comprises a coil framework on the inner side, at least two magnet yoke rings and an isolating ring, the magnet yoke rings and the isolating ring are located in the coil framework and outside the main pipe, the isolating ring is located between the two magnet yoke rings, a fixing disc is arranged on the main pipe and used for fixedly connecting the main pipe with the retainer, and a noise reduction pad is arranged between the fixing disc and the retainer. The silencing pad at least partially covers the end face of the retainer. According to the electromagnetic pump, the noise reduction pad is arranged between the fixing disc and the retainer, so that the noise generated by collision between the fixing disc and the retainer of the main pipe when the electromagnetic pump works is reduced, and the noise generated when the electromagnetic pump works is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pump equipment, and particularly to an electromagnetic pump. Background Art

[0002] Generally, small household pumps are often applied to the water supply and liquid delivery devices of small household appliances, such as electric irons, coffee machines, cleaning machines, etc. Existing electromagnetic pumps achieve the liquid delivery effect of the pump through the cyclic operation of two one-way valves for water inlet and outlet. The existing well-known technology is to connect a diode between a conductive coil and an AC power supply, and the diode is used to achieve the cyclic on-off of the coil, that is, to achieve the on-off of the magnetic conduction of the coil, thereby driving the pump core of the pump body to perform corresponding cyclic movements. The movement of the pump core enables the one-way valve to work, and finally realizes the liquid delivery function of the electromagnetic vibration pump. However, the above structure still needs to be further improved. Among them, the electromagnetic pump will make a relatively large noise during operation, resulting in poor use effects of household appliances. Summary of the Invention

[0003] The purpose of the present invention is to provide an electromagnetic pump to solve the technical problem of the large working noise of the electromagnetic pump.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: to provide an electromagnetic pump, including: a main pipe, a coil assembly, and a retainer. The coil assembly is sleeved outside the main pipe, and the retainer is fixed outside the coil assembly. The retainer is used for magnetic conduction outside the coil assembly. Two opposite through holes are provided on the retainer, and the main pipe passes through the through holes. The coil assembly includes an inner coil skeleton. At least two magnetic yoke rings and an isolation ring are arranged inside the coil skeleton and outside the main pipe. The isolation ring is located between the two magnetic yoke rings. A fixing disk is arranged on the main pipe, and the fixing disk is used for fixedly connecting the main pipe and the retainer. A sound-absorbing pad is arranged between the fixing disk and the retainer, and the sound-absorbing pad at least partially covers the end face of the retainer.

[0005] For the electromagnetic pump of the present invention, by arranging a sound-absorbing pad between the fixing disk and the retainer, the noise generated by the collision between the fixing disk of the main pipe and the retainer during the operation of the electromagnetic pump is reduced, thereby greatly reducing the noise during the operation of the electromagnetic pump; in addition, the buffering effect of the sound-absorbing pad also reduces the shaking of the main pipe itself and reduces the collision noise between the main pipe and the coil assembly and the magnetic yoke ring.

[0006] Preferably, the outer diameter of the magnetic yoke ring close to the sound-absorbing pad is smaller than the inner diameter of the through hole on the retainer at this position. A ring-shaped protrusion is arranged on the sound-absorbing pad, and the position of the ring-shaped protrusion corresponds to one end of the adjacent magnetic yoke ring. The ring-shaped protrusion is arranged between the fixing disk and the magnetic yoke ring, so that the noise generated by the axial collision between the magnetic yoke ring and the fixing disk is eliminated; at the same time, the ring-shaped protrusion presses the magnetic yoke ring, reducing the noise generated by the shaking of the magnetic yoke ring itself.

[0007] More preferably, the outer diameter of the annular protrusion is smaller than the outer diameter of the adjacent magnetic yoke ring. The outer diameter of the annular protrusion is set so that when the fixed plate is fixed to the retaining frame, the annular protrusion tends to be squeezed toward the center by the magnetic yoke ring, thereby filling the gap between the magnetic yoke ring and the main pipe and reducing the collision noise between the main pipe and the magnetic yoke ring.

[0008] More preferably, the outer diameter of the annular protrusion is smaller than the outer diameter of the adjacent yoke ring by 0.2mm-0.8mm. When the outer diameter difference between the two is less than 0.2mm, the yoke ring has little tendency to squeeze the annular protrusion toward the center, and the annular protrusion cannot effectively fill the gap between the main tube and the yoke ring. When the outer diameter difference between the two is greater than 0.8mm, the annular protrusion's ability to press and secure the yoke ring is severely weakened, resulting in poor compression of the yoke ring and a tendency for longitudinal vibration.

[0009] More preferably, the inner diameter of the annular protrusion is smaller than the inner diameter of the adjacent magnetic yoke ring. The inner diameter of the annular protrusion is set so that when the fixed plate is fixed to the retaining frame, the annular protrusion tends to be pressed into the gap between the main pipe and the magnetic yoke ring, thereby reducing the collision noise between the main pipe and the magnetic yoke ring.

[0010] More preferably, the inner diameter of the annular protrusion is smaller than the inner diameter of the adjacent yoke ring by 0.1mm-0.25mm. When the inner diameter difference between the two is less than 0.1mm, the annular protrusion has little tendency to squeeze between the main pipe and the yoke ring, and the annular protrusion cannot effectively fill the gap between the main pipe and the yoke ring. When the inner diameter difference between the two is greater than 0.25mm, the inner diameter of the annular protrusion may not fit well with the outer diameter of the main pipe during installation, causing the sound-absorbing pad to wrinkle at the main pipe, affecting the noise reduction effect of the sound-absorbing pad.

[0011] Preferably, the height of the annular protrusion is in the range of 0.15mm-0.5mm. When the height of the annular protrusion is less than 0.15mm, it fails to compress the magnetic yoke ring, and the magnetic yoke ring is prone to axial vibration and shaking, colliding with the retaining frame and coil bobbin, and generating noise. When the height of the annular protrusion is greater than 0.5mm, the silencer pad is likely to lose its compressive strength against the retaining frame, causing the fixed plate to collide with the retaining frame and the main pipe to shake, resulting in loud noise.

[0012] Preferably, a raised stop rib is provided on one side of the fixing plate located on the muffler pad. The stop rib can fix the degree of compression of the muffler pad and fix the relative position of the fixing plate and the retaining frame, so as to avoid buffering vibration caused by the presence of the muffler pad.

[0013] More preferably, the number of the above-mentioned stop ribs is at least two. If there are multiple stop ribs, the distance between the fixed plate and the retaining frame can be controlled from multiple points, thereby playing the role of overall shock absorption.

[0014] More preferably, the above-mentioned stop ribs are symmetrically arranged with respect to the center of the main pipe. The symmetrical arrangement of the stop ribs can better stabilize the fixing plate and prevent the fixing plate from vibrating at the part without the stop ribs.

[0015] More preferably, the height range of the above-mentioned stop ribs is 0.8 mm - 2 mm. When the height of the stop rib is less than 0.8 mm, it cannot play a stopping role or the sound-absorbing pad needs to be very thin so that the stop rib can contact the cage, either resulting in the fixing plate not directly contacting the cage and vibrating, or the sound-absorbing pad being too thin to play a buffering and shock-absorbing role. When the height of the stop rib is greater than 2 mm, it is easy to make the thickness of the sound-absorbing pad too thick, resulting in increased instability of the fixation and making the main pipe more likely to vibrate.

[0016] More preferably, the sound-absorbing pad is provided with a clearance position corresponding to the stop rib. The clearance position can be a notch or a through-hole, so that the stop rib can contact the surface of the cage when the fixing plate and the cage are locked, thereby playing a role in preventing the main pipe from trembling.

[0017] More preferably, the height of the stop rib is less than the thickness of the sound-absorbing pad at the corresponding clearance position. With such a height setting of the stop rib, when the fixing plate is locked with the cage, the sound-absorbing pad is compressed to a certain extent, enabling the sound-absorbing pad to better play a role in eliminating tremors.

[0018] More preferably, the size range of the height of the stop rib being less than the thickness of the sound-absorbing pad at the corresponding clearance position is 0.05 mm - 0.3 mm. When the size difference is less than 0.05 mm, the sound-absorbing pad is not compressed enough, easily leading to the occurrence of main pipe tremors; when the size difference is greater than 0.3 mm, it is easy for the stop rib to not contact the cage, causing the fixing plate and the cage not to form contact when locked, resulting in the occurrence of main pipe tremors.

[0019] Preferably, the thickness range of the sound-absorbing pad is 0.8 mm - 2 mm. When the thickness of the sound-absorbing pad is less than 0.8 mm, it is easy to not be able to play a buffering and shock-absorbing role; when the thickness of the sound-absorbing pad is greater than 2 mm, it is easy for the large thickness of the sound-absorbing pad to require a large locking force or locking stroke, which is not conducive to the relative stable fixation of the cage and the main pipe.

[0020] Preferably, the inner surface of the above-mentioned isolation ring is provided with inwardly protruding ribs. The ribs are used to fix the main pipe from the position of the isolation ring, so that the main pipe will not swing and vibrate within the coil skeleton.

[0021] More preferably, the number of the ribs is at least three. At least three ribs can fix the main pipe from multiple directions, so that the main pipe will not swing and vibrate in multiple directions.

[0022] More preferably, the ribs are arranged symmetrically with respect to the center axis of the isolation ring. The arrangement of the ribs can evenly clamp the main pipe, so that the main pipe is evenly stressed in all directions and is not prone to vibration.

[0023] More preferably, the height of the rib is in the range of 0.15mm-0.25mm. If the rib is less than 0.15mm, the main pipe cannot be held tightly, and the main pipe is prone to swinging and vibrating. If the rib is greater than 0.25mm, the main pipe is compressed too tightly, making installation difficult and even causing deformation, which affects the operation of the internal components.

[0024] More preferably, at least one side of the rib is provided with a release feature for releasing the force. This release feature can be a thinned groove or a through hole. This release feature prevents deformation of the isolation ring when the rib is squeezed by the main pipe. Providing this release feature on both sides of the rib can further prevent deformation of the isolation ring.

[0025] Preferably, the outer diameter of the magnetic yoke ring away from the fixed disk is larger than the inner diameter of the through hole on the retaining frame at that location, and the magnetic yoke ring away from the fixed disk is tightly fitted with the coil frame. The tight fit of the magnetic yoke ring can prevent the magnetic yoke ring from shaking inside the coil frame, thereby reducing noise.

[0026] More preferably, the inner surface of the isolation ring is provided with a disassembly slot, with both ends of the disassembly slot pointing to the two yoke rings. The disassembly slot allows the tightly fitting yoke ring to be knocked off with a tool through the other end during maintenance, thereby preventing the problem of the tightly fitting yoke ring being difficult to disassemble.

[0027] More preferably, the number of the disassembly slots is at least two. The multiple disassembly slots can knock the yoke ring out from multiple points, preventing the yoke ring from tilting in another direction when knocked at a single point, making it more difficult to remove.

[0028] More preferably, the disassembly slot is symmetrically arranged relative to the center axis of the isolation ring. The symmetrical arrangement of the disassembly slot allows the yoke ring to be controlled in its posture when being knocked out, thereby preventing the yoke ring from tilting and becoming difficult to remove.

[0029] More preferably, a sealing ring is provided in the through hole away from the fixed plate, and the sealing ring is provided on the main pipe. The sealing ring at the end of the main pipe further prevents the main pipe from swinging at that location, and prevents the main pipe from colliding with the yoke ring and the retaining frame and generating noise when vibrating. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0031] Wherein:

[0032] Figure 1 It is a schematic cross-sectional structure diagram of the electromagnetic pump 1000 according to an embodiment of the present invention;

[0033] Figure 2 It is a schematic three-dimensional structure diagram of a part of the main pipe 1100 of the electromagnetic pump 1000 according to an embodiment of the present invention;

[0034] Figure 3 It is a schematic cross-sectional structure diagram of a part of the coil assembly 1200 and the cage 1300 of the electromagnetic pump 1000 according to an embodiment of the present invention;

[0035] The reference numerals in the figure are:

[0036] 1000 - electromagnetic pump;

[0037] 1100 - main pipe;

[0038] 1110 - fixed disk;

[0039] 1111 - stop rib;

[0040] 1200 - coil assembly;

[0041] 1210 - coil skeleton;

[0042] 1211 - isolation ring;

[0043] 1212 - convex rib;

[0044] 1213 - force release position;

[0045] 1214 - disassembly through slot;

[0046] 1300 - cage;

[0047] 1310 - first through hole;

[0048] 1320 - second through hole;

[0049] 1410 - first yoke ring;

[0050] 1420 - second yoke ring;

[0051] 1500 - sound insulation pad;

[0052] 1510 - Ring-shaped protrusion;

[0053] 1520 - Clearance avoidance position;

[0054] 1600 - Sealing ring. Detailed implementation manner

[0055] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0056] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0057] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0059] As Figures 1 - 3 shown, where Figure 1 is a schematic cross-sectional structure diagram of the electromagnetic pump 1000 according to an embodiment of the present invention; Figure 2 is a schematic three-dimensional structure diagram of a part of the main pipe 1100 of the electromagnetic pump 1000 according to an embodiment of the present invention; Figure 3 is a schematic cross-sectional structure diagram of a part of the coil assembly 1200 and the cage 1300 of the electromagnetic pump 1000 according to an embodiment of the present invention.

[0060] This embodiment discloses an electromagnetic pump 1000, which includes a main pipe 1100, a coil assembly 1200, and a cage 1300. The main pipe 1100 passes through the coil assembly 1200 and the cage 1300, and the cage 1300 is sleeved outside the coil assembly 1200.

[0061] A fixing disk 1110 is arranged on the main pipe 1100, and the fixing disk 1110 is used to fix the main pipe 1100 and the cage 1300 together. A sound-absorbing pad 1500 is arranged between the fixing disk 1110 and the cage 1300, and the sound-absorbing pad 1500 partially covers the end faces of the fixing disk 1110 and the cage 1300.

[0062] The coil assembly 1200 includes a coil bobbin 1210, and a coil is wound on the coil bobbin 1210. The middle part of the coil bobbin 1210 bulges inward to form an isolation ring 1211. A first yoke ring 1410 and a second yoke ring 1420 are respectively sleeved outside the main pipe 1100 on both sides of the isolation ring 1211. The second yoke ring 1420 is in interference fit with the coil bobbin 1210. Convex ribs 1212 protruding inward are arranged on the inner surface of the isolation ring 1211. The number of the convex ribs 1212 is four, and they are centrosymmetrically distributed along the central axis of the isolation ring 1211. In other embodiments, the number of the convex ribs can also be three. Hollowed-out grooves are arranged on both sides of the convex ribs 1212 as force-relieving positions 1213, and the force-relieving positions 1213 can make the convex ribs 1212 more easily deformed in the radial direction without affecting the shape of the isolation ring 1211 itself. In other embodiments, the force-relieving positions can be only arranged on one side of the convex ribs. In this embodiment, the height of the convex ribs 1212 is 0.15 mm, and in other embodiments, the height of the convex ribs can also be 0.2 mm or 0.25 mm. A disassembly through groove 1214 is arranged on the inner surface of the isolation ring 1211, and the disassembly through groove 1214 communicates with both ends of the isolation ring 1211 and points to the first yoke ring 1410 and the second yoke ring 1420 respectively. The number of the disassembly through grooves 1214 is two, and they are centrosymmetrically distributed along the central axis of the isolation ring 1211. In other embodiments, the number of the disassembly through grooves can be three.

[0063] The cage 1300 is made of a metal material and is used for magnetic conduction. Two opposite first through holes 1310 and second through holes 1320 are arranged on the cage 1300 for the main pipe 1100 to pass through. The diameter of the first through hole 1310 is larger than the outer diameter of the first yoke ring 1410, and the end of the first yoke ring 1410 extends into the first through hole 1310. The diameter of the second through hole 1320 is smaller than the outer diameter of the second yoke ring 1420. The end of the second yoke ring 1420 can be in contact with the cage 1300.

[0064] The fixed disk 1110 is provided with stop ribs 1111 protruding towards the direction of the cage 1300, and the number of the stop ribs 1111 is six. In other embodiments, the number of the stop ribs can be two. Among them, the six stop ribs 1111 are centrosymmetric with respect to the central axis of the main pipe 1100 and are approximately evenly distributed. The sound-absorbing pad 1500 at the position of the stop ribs 1111 is provided with a clearance 1520. The thickness of the sound-absorbing pad 1500 at the clearance 1520 exceeds the height of the stop ribs 1111. In this embodiment, the height of the stop ribs 1111 is less than the thickness of the sound-absorbing pad 1500 at the corresponding clearance 1520 by 0.3 mm. In other embodiments, the dimension difference at this position can be 0.2 mm or 0.05 mm. In this embodiment, the height of the stop ribs is 0.8 mm. In other embodiments, the height of the stop ribs can be 1 mm or 2 mm. In this embodiment, the thickness of the sound-absorbing pad 1500 is 1.1 mm. In other embodiments, the thickness of the sound-absorbing pad can be 0.8 mm or 2 mm.

[0065] The sound-absorbing pad 1500 is provided with an annular protrusion 1510, and the annular protrusion 1510 abuts against the end of the first yoke ring 1410. The outer diameter of the annular protrusion 1510 is smaller than the outer diameter of the end of the first yoke ring 1410. In this embodiment, the outer diameter of the annular protrusion 1510 is smaller than the outer diameter of the end of the first yoke ring 1410 by 0.5 mm. In other embodiments, the dimension that the outer diameter of the annular protrusion is smaller than the outer diameter of the end of the first yoke ring can also be 0.2 mm or 0.8 mm. The inner diameter of the annular protrusion 1510 is smaller than the inner diameter of the end of the first yoke ring 1410. In this embodiment, the inner diameter of the annular protrusion 1510 is smaller than the inner diameter of the end of the first yoke ring 1410 by 0.15 mm. In other embodiments, the dimension that the inner diameter of the annular protrusion is smaller than the inner diameter of the end of the first yoke ring can also be 0.1 mm or 0.25 mm. In this embodiment, the height of the annular protrusion 1510 is 0.4 mm. In other embodiments, the height of the annular protrusion can also be 0.15 mm or 0.5 mm.

[0066] A sealing ring 1600 is arranged at the end of the main pipe 1100, and the sealing ring 1600 is arranged outside the main pipe 1100 and inside the cage 1300.

[0067] In this embodiment of the electromagnetic pump 1000, by arranging the sound-absorbing pad 1500 between the fixed disk 1110 and the cage 130, arranging the convex ribs 1212 in the isolation ring 1211, and arranging the sealing ring 1600 at the end of the main pipe 1100, the main pipe 1100 is clamped from three positions, preventing the main pipe 1100 from swinging or vibrating, so that the main pipe 1100 will not easily collide with other components, and greatly reducing the working noise of the electromagnetic pump 1000.

[0068] The above-disclosed is only the preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An electromagnetic pump, comprising: A main pipe, a coil assembly and a cage. The coil assembly is sleeved outside the main pipe, the cage is fixed outside the coil assembly, and the cage is used for magnetic conduction outside the coil assembly. There are two opposite through holes on the cage, and the main pipe passes through the through holes. The coil assembly includes an inner coil skeleton, and at least two magnetic yoke rings and an isolation ring are arranged inside the coil skeleton and outside the main pipe. The isolation ring is located between the two magnetic yoke rings. A fixing plate is arranged on the main pipe, and the fixing plate is used for fixedly connecting the main pipe and the cage. It is characterized in that: a sound-absorbing pad is arranged between the fixing plate and the cage, and the sound-absorbing pad at least partially covers the end face of the cage.

2. The electromagnetic pump according to claim 1, wherein The outer diameter of the magnetic yoke ring close to the sound-absorbing pad is smaller than the inner diameter of the through hole on the cage at this position. A ring-shaped protrusion is arranged on the sound-absorbing pad, and the position of the ring-shaped protrusion corresponds to one end of the adjacent magnetic yoke ring.

3. The electromagnetic pump according to claim 2, wherein The outer diameter of the ring-shaped protrusion is smaller than the outer diameter of the adjacent magnetic yoke ring.

4. The electromagnetic pump according to claim 3, characterized in that, The size range of the outer diameter of the ring-shaped protrusion being smaller than the outer diameter of the adjacent magnetic yoke ring is 0.2 mm - 0.8 mm.

5. The electromagnetic pump according to claim 2, characterized in that, The inner diameter of the ring-shaped protrusion is smaller than the inner diameter of the adjacent magnetic yoke ring.

6. The electromagnetic pump according to claim 5, wherein, The size range of the inner diameter of the ring-shaped protrusion being smaller than the inner diameter of the adjacent magnetic yoke ring is 0.1 mm - 0.25 mm.

7. The electromagnetic pump according to claim 1, wherein, The protrusion height range of the ring-shaped protrusion is 0.15 mm - 0.5 mm.

8. The electromagnetic pump according to claim 1, characterized in that On one side of the fixing plate where it is located on the sound-absorbing pad, there are protruding stop ribs.

9. The electromagnetic pump according to claim 8, characterized in that, The number of the stop ribs is at least two.

10. The electromagnetic pump according to claim 9, characterized in that, The stop ribs are symmetrically arranged with respect to the center of the main pipe.

11. The electromagnetic pump according to claim 8, characterized in that, The height range of the stop ribs is 0.8 mm - 2 mm.

12. The electromagnetic pump according to claim 8, wherein, The sound-absorbing pad is provided with avoidance positions corresponding to the stop ribs.

13. The electromagnetic pump according to claim 12, characterized in that, The height of the stop rib is smaller than the thickness of the sound-absorbing pad at the corresponding avoidance position.

14. The electromagnetic pump according to claim 13, characterized in that, The size range of the height of the stop rib being smaller than the thickness of the sound-absorbing pad at the corresponding avoidance position is 0.05 mm - 0.3 mm.

15. The electromagnetic pump according to claim 1, characterized in that, The thickness range of the sound-absorbing pad is 0.8 mm - 2 mm.

16. The electromagnetic pump according to claim 1, wherein On the inner surface of the isolation ring, there are inwardly protruding ribs.

17. The electromagnetic pump according to claim 16, wherein, The number of the ribs is at least three.

18. The electromagnetic pump according to claim 17, wherein, The ribs are symmetrically arranged with respect to the central axis of the isolation ring.

19. The electromagnetic pump according to claim 16, characterized in that, The height range of the ribs is 0.15 mm - 0.25 mm.

20. The electromagnetic pump according to claim 16, characterized in that, At least one side of the rib is provided with a force-releasing position for releasing force.

21. The electromagnetic pump according to claim 1, wherein, The outer diameter of the magnetic yoke ring far from the fixing plate is larger than the inner diameter of the through hole on the cage at this position, and the magnetic yoke ring far from the fixing plate is tightly fitted with the coil skeleton.

22. The electromagnetic pump according to claim 21, characterized in that, On the inner surface of the isolation ring, there are disassembly through grooves, and the two ends of the disassembly through grooves point to the two magnetic yoke rings.

23. The electromagnetic pump according to claim 22, characterized in that, The number of the disassembly through grooves is at least two.

24. The electromagnetic pump according to claim 23, characterized in that, The disassembly through grooves are symmetrically arranged with respect to the central axis of the isolation ring.

25. The electromagnetic pump according to claim 21, characterized in that, A sealing ring is arranged inside the through hole far from the fixing plate, and the sealing ring is arranged on the main pipe.

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