Electromagnetic pump

Abstract

The utility model relates to an electromagnetic pump. The electromagnetic pump comprises a coil framework, an electromagnetic coil and a pump body assembly, the coil framework is sleeved with the electromagnetic coil, a mounting cavity is formed in the inner circumferential face of the coil framework, and the pump body assembly is arranged in the mounting cavity; the pump body assembly comprises a base, a resonance piece, a vibrating piece and a cover body which are sequentially stacked in the axis direction of the coil framework, a pump chamber is formed between the cover body and the resonance piece, a permanent magnet is arranged at the position, located in the pump chamber, of the vibrating piece, the resonance piece is provided with an air inlet hole, the cover body is provided with an air outlet hole, and the permanent magnet is arranged in the pump chamber. An avoiding groove is formed in the base; after the electromagnetic coil is electrified, the permanent magnet is driven to do reciprocating motion in the axis direction of the pump chamber, so that the vibration piece and the resonance piece vibrate, and fluid in the avoiding groove enters the pump chamber through the air inlet hole and is pumped out from the air outlet hole. According to the scheme provided by the invention, the risk of ceramic cracking of the piezoelectric ceramic pump can be avoided, and the piezoelectric ceramic pump has the characteristics of miniaturization, lightness and thinness.

Description

Technical Field

[0001] The present application relates to the technical field of pumps, and in particular to an electromagnetic pump. Background Art

[0002] Medical and health care equipment such as air bag massagers, blood pressure monitors, vital signs monitors, eye air bag massagers, etc. usually have a small piezoelectric ceramic pump to supply air to the air bag.

[0003] The principle of the piezoelectric ceramic pump is that the deformation and vibration of the piezoelectric ceramic drives the flow of gas. However, piezoelectric ceramics are affected by life and environmental vibrations, and are prone to irreversible cracking and damage when deformed. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides an electromagnetic pump that can avoid the risk of ceramic cracking in a piezoelectric ceramic pump and has the characteristics of miniaturization and lightness.

[0005] The present application provides an electromagnetic pump, comprising: a coil frame, an electromagnetic coil and a pump body assembly, wherein the electromagnetic coil is sleeved on the coil frame, an installation cavity is formed on the inner circumferential surface of the coil frame, and the pump body assembly is arranged in the installation cavity; the pump body assembly comprises a base, a resonance plate, a vibration plate and a cover body which are stacked in sequence along the axial direction of the coil frame, a pump chamber is formed between the cover body and the resonance plate, a permanent magnet is provided at the position of the vibration plate located in the pump chamber, the resonance plate is provided with an air inlet hole, the cover body is provided with an air outlet hole, and the base is provided with an avoidance groove; when the electromagnetic coil is energized, it drives the permanent magnet to reciprocate in the axial direction of the pump chamber, so that the vibration plate and the resonance plate vibrate, so that the fluid in the avoidance groove enters the pump chamber through the air inlet hole and is pumped out from the air outlet hole.

[0006] Furthermore, one side of the resonance plate is in contact with the base, the resonance plate is located in the avoidance groove and can resonate, and the air inlet is arranged relative to the avoidance groove.

[0007] Furthermore, the vibration sheet includes an outer ring portion, a connecting portion, and a vibration portion located in an inner circle of the outer ring portion, the vibration portion is connected to the outer ring portion via the connecting portion, and the permanent magnet is disposed on the vibration portion.

[0008] Furthermore, one side of the outer ring portion is in contact with the resonant plate, and the other side of the outer ring portion is in contact with the cover.

[0009] Furthermore, a side of the outer ring portion that is in contact with the resonance plate protrudes beyond a side of the connecting portion that is close to the resonance plate, so that a gap exists between the connecting portion and the resonance plate.

[0010] Furthermore, a side of the connecting portion close to the resonance plate is flush with a side of the vibrating portion close to the resonance plate, a side of the vibrating portion close to the resonance plate is provided with a boss, and the boss is arranged opposite to the air inlet.

[0011] Furthermore, a flange is provided on the edge of the cover body, an end surface of the flange is in contact with the outer ring portion, the cover body is provided with a chamber, and the pump chamber is located in a region between the chamber and the resonance plate.

[0012] Furthermore, the avoidance groove is arranged on a side of the base close to the resonance plate, and an air inlet communicating with the avoidance groove is arranged on the base.

[0013] Furthermore, an air inlet groove is provided on one side of the base close to the resonance plate, and the air inlet groove is respectively connected to the avoidance groove and the air inlet. Gas enters the avoidance groove from the side of the base away from the resonance plate through the air inlet and the air inlet groove.

[0014] Furthermore, two end surfaces of the coil skeleton are respectively provided with convex rings, and the two convex rings and the outer peripheral surface of the coil skeleton form a slot, and the electromagnetic coil is located in the slot;

[0015] The electromagnetic pump also includes a yoke magnetic ring sleeved on the two convex rings.

[0016] Furthermore, a receiving platform is provided at one end of the inner circumference of the coil frame, the edge of the resonance plate is attached to the end surface of the receiving platform, and the receiving platform is sleeved on the base.

[0017] Furthermore, a sealing groove is provided on the end surface of the receiving platform, a first sealing member is provided in the sealing groove, and the first sealing member is located between the resonant plate and the receiving platform.

[0018] Furthermore, a second sealing member is provided between the cover body and the inner circumferential surface of the coil skeleton.

[0019] The technical solution provided by the present application may include the following beneficial effects: after the electromagnetic coil is energized, the permanent magnet is driven to perform reciprocating motion in the axial direction of the pump chamber, so that the vibration plate and the resonance plate vibrate, and the avoidance groove leaves space for the resonance plate to vibrate, so that when the vibration plate and the resonance plate vibrate, the fluid in the avoidance groove enters the pump chamber through the air inlet and is pumped out from the air outlet. Therefore, the above-mentioned electromagnetic pump does not need to use piezoelectric ceramics, avoiding the risk of ceramic cracking of the piezoelectric ceramic pump; the resonance plate and the vibration plate are sheet-like structures, which can make the electromagnetic pump miniaturized and lightweight.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0022] Figure 1 It is a schematic diagram of the structure of the electromagnetic pump shown in the embodiment of the present application;

[0023] Figure 2 is a cross-sectional schematic diagram of an electromagnetic pump shown in an embodiment of the present application;

[0024] Figure 3 is an exploded schematic diagram of an electromagnetic pump shown in an embodiment of the present application;

[0025] Figure 4 is a schematic structural diagram of a cover body shown in an embodiment of the present application;

[0026] Figure 5 is a schematic structural diagram of a base shown in an embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of a coil skeleton shown in an embodiment of the present application;

[0028] Figure 7 It is a schematic diagram of the structure of the vibration plate shown in the embodiment of the present application.

[0029] Reference numerals:

[0030] 1-coil skeleton, 11-installation cavity, 12-convex ring, 13-slot, 14-receiving platform, 15-sealing groove;

[0031] 2- Electromagnetic coil;

[0032] 3-base, 31-avoidance groove, 32-air inlet, 33-air inlet groove;

[0033] 4-resonance plate, 41-air inlet;

[0034] 5-vibration plate, 51-outer ring portion, 52-connecting portion, 53-vibration portion, 54-boss;

[0035] 6-cover, 61-air outlet, 62-flange, 63-chamber;

[0036] 7- pump chamber, 8- permanent magnet, 9- yoke magnetic ring, 10- first sealing member, 20- second sealing member. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0038] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply 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 understood as a limitation on the present application.

[0040] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Medical and health care equipment such as air bag massagers, blood pressure monitors, vital signs monitors, eye air bag massagers, etc. usually have a small piezoelectric ceramic pump to supply air to the air bag.

[0042] The principle of the piezoelectric ceramic pump is that the deformation and vibration of the piezoelectric ceramic drives the flow of gas. However, piezoelectric ceramics are affected by life and environmental vibrations, and are prone to irreversible cracking and damage when deformed.

[0043] In view of the above problems, an embodiment of the present application provides an electromagnetic pump that can avoid the risk of ceramic cracking in a piezoelectric ceramic pump and has the characteristics of miniaturization and lightness.

[0044] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0045] like Figures 1 to 6 As shown, the embodiment of the present application provides an electromagnetic pump, including a coil frame 1, an electromagnetic coil 2 and a pump body assembly, wherein the electromagnetic coil 2 is sleeved on the coil frame 1, and an installation cavity 11 is formed on the inner circumference of the coil frame 1, and the pump body assembly is arranged in the installation cavity 11. The coil frame 1 can be made of a plastic part and is cylindrical, and the electromagnetic coil 2 is wound on the outer circumference of the coil frame 1.

[0046] Among them, the pump body assembly includes a base 3, a resonance plate 4, a vibration plate 5 and a cover body 6 which are stacked in sequence along the axial direction of the coil skeleton 1, a pump chamber 7 is formed between the cover body 6 and the resonance plate 4, a permanent magnet 8 is provided at the position of the vibration plate 5 located in the pump chamber 7, the resonance plate 4 is provided with an air inlet hole 41, the cover body 6 is provided with an air outlet hole 61, and the base 3 is provided with an avoidance groove 31.

[0047] Specifically, the base 3, the resonant plate 4, the vibrating plate 5 and the cover 6 can be connected in sequence by adhesive bonding. The base 3, the resonant plate 4, the vibrating plate 5 and the cover 6 are all circular structures and are coaxially arranged. The resonant plate 4 and the cover 6 are located on both sides of the vibrating plate 5 and are respectively connected to the edges of the vibrating plate 5. The middle of the vibrating plate 5 is located in the pump chamber 7 and is not connected to the resonant plate 4 and the cover 6. The middle of the vibrating plate 5 can vibrate back and forth with the permanent magnet 8, and the permanent magnet 8 can be fixed to the middle of the vibrating plate 5 by adhesive bonding. The resonant plate 4 can be connected to the surface of the base 3 by adhesive bonding. The avoidance groove 31 is provided on the side of the base 3 close to the resonant plate 4. The avoidance groove 31 leaves space for the resonant plate 4 to vibrate. The avoidance groove 31 is located in the middle of the base 3 and is circular.

[0048] The base 3 can be made of brass material, which is easy to process. The resonance plate 4 and the vibration plate 5 can be made of non-magnetic metal material. The permanent magnet 8 can be a round thin sheet. The cover 6 can be made of plastic material.

[0049] After the electromagnetic coil 2 is energized, it drives the permanent magnet 8 to reciprocate in the axial direction of the pump chamber 7, so that the vibration plate 5 and the resonance plate 4 vibrate, so that the fluid in the avoidance groove 31 enters the pump chamber 7 through the air inlet 41 and is pumped out from the air outlet 61. Specifically, the fluid in the avoidance groove 31 can be gas or liquid. In this embodiment, gas is taken as an example. Figure 2 and Figure 3As shown, when the permanent magnet 8 drives the middle part of the vibration plate 5 to move upward, the gas in the pump chamber 7 is pushed upward and discharged from the air outlet 61 of the cover body 6; when the permanent magnet 8 drives the middle part of the vibration plate 5 to move downward, the gas located below the vibration plate 5 in the pump chamber 7 will move from the gap on the vibration plate 5 to the top of the vibration plate 5 under the push of the vibration plate 5, so as to facilitate the gas to be discharged from the air outlet 61 above when the vibration plate 5 moves upward next time; while the vibration plate 5 vibrates up and down, the part of the resonance plate 4 located in the avoidance groove 31 also vibrates up and down, and the gas in the avoidance groove 31 can enter the pump chamber 7 through the air inlet 41.

[0050] The high-frequency alternating electric field generated by the electromagnetic coil 2 drives the permanent magnet 8 to vibrate, and the air pressure and flow rate of the electromagnetic pump can be adjusted by adjusting the voltage loaded on the electromagnetic coil 2. After the electromagnetic coil 2 is energized, the permanent magnet 8 is driven to reciprocate in the axial direction of the pump chamber 7, so that the vibration plate 5 and the resonance plate 4 vibrate, and the avoidance groove 31 leaves space for the resonance plate 4 to vibrate, so that when the vibration plate 5 and the resonance plate 4 vibrate, the fluid in the avoidance groove 31 enters the pump chamber 7 through the air inlet 41 and is pumped out from the air outlet 61. Therefore, the above-mentioned electromagnetic pump does not need to use piezoelectric ceramics, avoiding the risk of ceramic cracking of the piezoelectric ceramic pump; the resonance plate 4 and the vibration plate 5 are sheet structures, which can make the electromagnetic pump have the characteristics of miniaturization and lightness.

[0051] In some embodiments, one side of the resonance plate 4 is fitted with the base 3, the resonance plate 4 is located in the avoidance groove 31 and can resonate, and the air inlet 41 is arranged relative to the avoidance groove 31. Specifically, one side of the resonance plate 4 is fitted with the base 3 by gluing, the avoidance groove 31 is provided on the surface of one side where the base 3 and the resonance plate 4 are fitted, the avoidance groove 31 is a concave circular groove, the axis of the avoidance groove 31 coincides with the axis of the base 3, and the axis of the air inlet 41 coincides with the axis of the avoidance groove 31. The resonance plate 4 can vibrate up and down at the position of the avoidance groove 31, and the other parts of the resonance plate 4 do not vibrate because they are fixedly fitted with the base 3. The resonance plate 4 vibrates locally at the avoidance groove 31 to guide the airflow into the pump chamber 7.

[0052] In some embodiments, Figure 7 As shown, the vibration sheet 5 includes an outer ring portion 51, a connecting portion 52, and a vibration portion 53 located in the inner circle of the outer ring portion 51. The vibration portion 53 is connected to the outer ring portion 51 through the connecting portion 52, and the permanent magnet 8 is disposed on the vibration portion 53. Specifically, there is a gap between the outer ring portion 51 and the vibration portion 53, and the permanent magnet 8 drives the vibration portion 53 to vibrate up and down. When the vibration portion 53 vibrates up and down, the connecting portion 52 is deformed. The outer ring portion 51 is connected to the resonance sheet 4 and the cover body 6. When the vibration portion 53 vibrates, the outer ring portion 51 does not move.

[0053] When the permanent magnet 8 drives the vibration part 53 to move downward, the gas below the vibration part 53 in the pump chamber 7 will move from the gap between the outer ring part 51 and the vibration part 53 to the top of the vibration part 53 under the push of the vibration part 53, thereby facilitating the discharge of gas from the upper air outlet 61 when the vibration part 53 moves upward next time.

[0054] In some embodiments, one side of the outer ring portion 51 is in contact with the resonant plate 4, and the other side of the outer ring portion 51 is in contact with the cover 6. Specifically, the outer ring portion 51 can be respectively connected to the resonant plate 4 and the cover 6 by adhesive bonding, and the outer ring portion 51 is fixed when the vibration portion 53 vibrates back and forth to ensure that the vibration path of the vibration portion 53 does not deviate.

[0055] In some embodiments, Figure 2 and Figure 7 As shown, the side of the outer ring portion 51 that is in contact with the resonance sheet 4 protrudes from the side of the connection portion 52 that is close to the resonance sheet 4, so that there is a gap between the connection portion 52 and the resonance sheet 4. By providing a gap between the connection portion 52 and the resonance sheet 4, it is possible to prevent the glue from overflowing to the connection portion 52 and adhering the connection portion 52 to the resonance sheet 4 when the outer ring portion 51 is glued to the resonance sheet 4, thereby ensuring the deformation effect of the connection portion 52.

[0056] In some embodiments, Figure 7 As shown, the side of the connecting portion 52 close to the resonance plate 4 is flush with the side of the vibration portion 53 close to the resonance plate 4, and a boss 54 is provided on the side of the vibration portion 53 close to the resonance plate 4, and the boss 54 is arranged opposite to the air inlet 41. The boss 54 can compensate for the gap between the connecting portion 52 and the resonance plate 4, and the boss 54 abuts against the resonance plate 4, and the side surface of the boss 54 close to the resonance plate 4 is flush with the side surface of the outer ring portion 51 abutting against the resonance plate 4, so that when stationary, the boss 54 abuts against the resonance plate 4 and covers the air inlet 41, so as to ensure that the resonance plate 4 vibrates with the vibration portion 53 when the vibration portion 53 vibrates.

[0057] In some embodiments, Figure 2 and Figure 4 As shown, the edge of the cover body 6 is provided with a flange 62, the end face of the flange 62 is fitted with the outer ring portion 51, the cover body 6 is provided with a chamber 63, and the pump chamber 7 is located in the area between the chamber 63 and the resonance plate 4. Specifically, the cover body 6 is a cap-shaped structure, the lower end face of the flange 62 is connected to the outer ring portion 51 by gluing, the chamber 63 is provided on the lower side of the cover body 6, the area between the chamber 63 and the resonance plate 4 forms the pump chamber 7, the vibration portion 53 vibrates back and forth in the pump chamber 7, and the outer ring portion 51 is respectively connected to the flange 62 and the resonance plate 4, so that the side of the pump chamber 7 is sealed.

[0058] In some embodiments, Figure 2 and Figure 5As shown, the avoidance groove 31 is arranged on one side of the base 3 close to the resonance plate 4, and the base 3 is provided with an air inlet 32 ​​connected with the avoidance groove 31. Specifically, the external airflow enters the avoidance groove 31 through the air inlet 32, and the air inlet 32 ​​extends from the side surface of the base 3 away from the resonance plate 4 to the side of the resonance plate 4, and is connected with the avoidance groove 31. In this way, when the permanent magnet 8 vibrates, the electromagnetic pump passes the external gas through the base 3 into the pump chamber 7, and then discharges it from the air outlet 61 of the cover body 6.

[0059] In some embodiments, Figure 5 As shown, the side of the base 3 close to the resonance plate 4 is also provided with an air inlet groove 33, and the air inlet groove 33 is respectively connected with the avoidance groove 31 and the air inlet 32, and the gas enters the avoidance groove 31 from the side of the base 3 away from the resonance plate 4 through the air inlet 32 ​​and the air inlet groove 33. By providing the air inlet groove 33 on the base 3, the viscosity of the gas can be changed, which is convenient for pumping gas. Specifically, in this embodiment, there are four air inlets 32, which are evenly spaced around the avoidance groove 31, and each air inlet 32 ​​is respectively connected with the avoidance groove 31 through an air inlet groove 33, so that the external gas is evenly fed into the avoidance groove 31.

[0060] In some embodiments, Figure 1 and Figure 6 As shown, the two end faces of the coil skeleton 1 are respectively provided with convex rings 12, and the two convex rings 12 and the outer peripheral surface of the coil skeleton 1 form a clamping groove 13, and the electromagnetic coil 2 is located in the clamping groove 13. The two convex rings 12 limit the electromagnetic coil 2; the electromagnetic pump also includes a yoke magnetic ring 9 sleeved on the two convex rings 12. Specifically, the yoke magnetic ring 9 can be made of tinplate and is used to play a yoke magnetic role on the magnetic field generated by the coil.

[0061] In some embodiments, Figure 2 and Figure 6 As shown, a receiving platform 14 is provided at one end of the inner circumference of the coil frame 1, and the edge of the resonant sheet 4 is attached to the end surface of the receiving platform 14, and the receiving platform 14 is sleeved on the base 3. Specifically, the edge of the resonant sheet 4 can be fixedly connected to the end surface of the receiving platform 14 by gluing, as shown in FIG. Figure 2 As shown, the receiving platform 14 is arranged at the lower end of the inner circumference of the coil skeleton 1, and is in an annular structure along the inner circumference of the coil skeleton 1. The receiving platform 14 and the coil skeleton 1 can be an integrally formed structure. The receiving platform 14 is used to support and fix the resonance plate 4, and the base 3 is located in the ring formed by the receiving platform 14. In this way, the electromagnetic pump has an overall pancake-shaped structure, which is characterized by miniaturization and lightness.

[0062] In some embodiments, Figure 2 , Figure 3 and Figure 6As shown, a sealing groove 15 is provided on the end surface of the receiving platform 14, and a first sealing member 10 is provided in the sealing groove 15. The first sealing member 10 is located between the resonance plate 4 and the receiving platform 14. Specifically, a sealing groove 15 is provided on the end surface of the receiving platform 14 connected to the resonance plate 4, and the sealing groove 15 is arranged along the inner circumference of the coil skeleton 1. The first sealing member 10 can be a structural sealant, which is filled in the sealing groove 15 to seal the resonance plate 4 and the receiving platform 14.

[0063] In some embodiments, Figures 1 to 4 As shown, a second seal 20 is provided between the cover 6 and the inner circumference of the coil frame 1. The second seal 20 can be a structural sealant. There is a height difference between the flange 62 of the cover 6 and the upper end surface of the cover 6 and a step structure is formed. The second seal 20 is filled between the step structure and the inner circumference of the coil frame 1, thereby sealing the cover 6 and the coil frame 1. The upper and lower seals can further seal the pump chamber 7.

[0064] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of the various embodiments have their own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0065] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electromagnetic pump, characterized in that: include: A coil frame, an electromagnetic coil and a pump body assembly, wherein the electromagnetic coil is sleeved on the coil frame, an installation cavity is formed on the inner circumference of the coil frame, and the pump body assembly is arranged in the installation cavity; The pump body assembly comprises a base, a resonance plate, a vibration plate and a cover body which are sequentially stacked along the axial direction of the coil skeleton, a pump chamber is formed between the cover body and the resonance plate, a permanent magnet is provided at the part of the vibration plate located in the pump chamber, the resonance plate is provided with an air inlet hole, the cover body is provided with an air outlet hole, and the base is provided with an avoidance groove; When the electromagnetic coil is energized, it drives the permanent magnet to reciprocate in the axial direction of the pump chamber, so that the vibration plate and the resonance plate vibrate, thereby allowing the fluid in the avoidance groove to enter the pump chamber through the air inlet and be pumped out from the air outlet.

2. The electromagnetic pump according to claim 1, characterized in that: One side of the resonance plate is in contact with the base, and the resonance plate is located at the position of the avoidance groove so as to be able to resonate, and the air inlet is arranged relative to the avoidance groove.

3. The electromagnetic pump according to claim 1, characterized in that: The vibration piece includes an outer ring portion, a connecting portion, and a vibration portion located in an inner circle of the outer ring portion. The vibration portion is connected to the outer ring portion through the connecting portion, and the permanent magnet is disposed on the vibration portion.

4. The electromagnetic pump according to claim 3, characterized in that: One side of the outer ring portion is in contact with the resonance plate, and the other side of the outer ring portion is in contact with the cover body.

5. The electromagnetic pump according to claim 4, characterized in that: The side of the outer ring portion that is in contact with the resonance plate protrudes beyond the side of the connecting portion that is close to the resonance plate, so that a gap exists between the connecting portion and the resonance plate.

6. The electromagnetic pump according to claim 5, characterized in that: A side of the connecting portion close to the resonance plate is flush with a side of the vibrating portion close to the resonance plate. A boss is provided on a side of the vibrating portion close to the resonance plate. The boss is arranged opposite to the air inlet.

7. The electromagnetic pump according to claim 4, characterized in that: The edge of the cover body is provided with a flange, the end surface of the flange is in contact with the outer ring portion, the cover body is provided with a chamber, and the pump chamber is located in the area between the chamber and the resonance plate.

8. The electromagnetic pump according to claim 1, characterized in that: The avoidance groove is arranged on a side of the base close to the resonance plate, and an air inlet communicating with the avoidance groove is arranged on the base.

9. The electromagnetic pump according to claim 8, characterized in that: An air inlet groove is also provided on one side of the base close to the resonance plate, and the air inlet groove is respectively connected to the avoidance groove and the air inlet. Gas enters the avoidance groove from the side of the base away from the resonance plate through the air inlet and the air inlet groove.

10. The electromagnetic pump according to claim 1, characterized in that: The two end surfaces of the coil frame are respectively provided with convex rings, and the two convex rings and the outer peripheral surface of the coil frame form a slot, and the electromagnetic coil is located in the slot; The electromagnetic pump also includes a yoke magnetic ring sleeved on the two convex rings.

11. The electromagnetic pump according to claim 1, characterized in that: A receiving platform is provided at one end of the inner circumference of the coil frame, the edge of the resonance sheet is attached to the end surface of the receiving platform, and the receiving platform is sleeved on the base.

12. The electromagnetic pump according to claim 11, characterized in that: A sealing groove is provided on the end surface of the receiving platform, a first sealing member is provided in the sealing groove, and the first sealing member is located between the resonance plate and the receiving platform.

13. The electromagnetic pump according to claim 12, characterized in that: A second sealing member is provided between the cover body and the inner circumferential surface of the coil frame.

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