TWI860845B - Solenoid Air Pump - Google Patents

Abstract

無。

Description

Solenoid Air Pump

The present invention relates to an air pump, and more particularly to an electromagnetic air pump that generates an air supply source by compressing or expanding an air chamber through electromagnetic control.

Air pumps can be used to generate air supply sources to supply objects that need to be inflated, such as various inflatable objects such as air mattresses. Electromagnetic air pumps control the compression or expansion of the air chamber defined internally, so that the air chamber inputs air into the inflated object when it is compressed, and the air chamber allows external air to be sucked into the air chamber when it expands, so that it can be supplied to the inflated object when it is compressed next time.

Among them, when the electromagnetic air pump is operating, the compression and expansion of the air chamber need to be repeated, and the rubber cap used to define the internal space of the air chamber must be squeezed frequently accordingly, so that the compression effect of the air chamber can be produced by the collapse deformation of the rubber cap shape, and the air inside the air chamber can be output. However, the frequent deformation of the traditional rubber cap and the asymmetrical and uniform distribution of force will make the structure of the deformation part easy to age or even damage, resulting in the failure of the electromagnetic air pump's air supply and the electromagnetic air pump's life is too short.

One of the purposes of the present invention is to extend the service life of the rubber cap in the electromagnetic air pump.

Another purpose of the present invention is to achieve a uniform force effect when the rubber cap in the electromagnetic air pump is subjected to force.

To achieve the above and other purposes, the present invention provides an electromagnetic air pump, comprising: a swing arm and an air chamber that can be compressed or expanded. The air chamber is defined by a platform surface and a rubber cap that can be pressed down by the swing arm, and the rubber cap includes a support body and a cover body. When the electromagnetic air pump is in operation, the cover body is configured to support the support body with the platform surface when pressed down by the swing arm. The cover body is defined by a plurality of pairs of geometrically symmetrical parts, wherein, when the air chamber is compressed or expanded, each pair of geometrically symmetrical parts has a pair of displacement changes relative to the platform surface. When at least one pair of geometrically symmetrical parts is subjected to the maximum deformation pressure, the difference between the displacement changes corresponding to the at least one pair of geometrically symmetrical parts is no more than 5%, so as to achieve the effect of substantially uniform stress on each pair of geometrically symmetrical parts.

To achieve the above and other purposes, the present invention further proposes an electromagnetic air pump, comprising: a cylinder seat, a rubber cap and a swing arm. The cylinder seat has a platform. The rubber cap includes a support body and a cover body, and an air chamber is defined between the support body and the cover body and the platform. The first end of the swing arm is rotatably arranged on the cylinder seat, and the second end is provided with a magnetic element for the swing arm to be controlled by a coil to press down or pull up the rubber cap accordingly. Among them, the cover body defines a plurality of pairs of geometrically symmetrical parts. When the rubber cap is pressed down or pulled up and at least one pair of geometrically symmetrical parts is under the maximum deformation pressure, the forces of the two geometrically symmetrical parts of the at least one pair of geometrically symmetrical parts in the corresponding deformation stroke are roughly the same.

To achieve the above-mentioned and other purposes, the present invention further proposes an electromagnetic air pump, comprising: a cylinder seat, a rubber cap assembly, a swing arm assembly and a coil assembly. The cylinder seat has two platforms arranged on opposite sides. The rubber cap assembly includes two rubber caps respectively arranged on corresponding platforms on opposite sides of the cylinder seat, each of which includes a support body and a cover body and defines an air chamber with the corresponding platform abutting against the support body and the cover body. The swing arm assembly includes two swing arms, the first end of each swing arm is rotatably arranged on the cylinder seat, the second end of each swing arm is provided with a magnetic element, and each swing arm is connected to a corresponding rubber cap. The coil assembly faces the magnetic element and is used to generate magnetic force after power is applied to rotate each swing arm, so as to press down or pull up each rubber cap accordingly. The two platforms of the cylinder seat are not parallel to each other so that when the rubber caps are pressed down or pulled up by the swing arm rotation, at least one pair of geometrically symmetrical parts are subjected to the maximum deformation pressure. The forces on the two parts of the at least one pair of geometrically symmetrical parts in the corresponding deformation stroke are roughly the same, so that each rubber cap is substantially uniformly stressed.

According to some embodiments of the present invention, a cylinder base body having a platform surface may be included, and the first end of the swing arm is rotatably disposed on the cylinder base body. When the swing arm presses down against the cover body to compress the air chamber, the angle between the platform surface and the swing arm may be less than 5 degrees.

According to some embodiments of the present invention, a cylinder body having a platform surface may be included, the first end of the swing arm may be rotatably disposed on the cylinder body, and a magnetic element may be disposed on the second end of the swing arm opposite to the first end, so that the swing arm is controlled by the coil to press down or lift the cover body accordingly. The height of the platform surface of the cylinder body near the first end may be greater than the height of the platform surface near the second end. The platform surface presents an inclined surface.

According to some embodiments of the present invention, a cylinder base having a platform surface may be included, the first end of the swing arm may be rotatably disposed on the cylinder base, and a magnetic element may be disposed on the second end of the swing arm opposite to the first end, so that the swing arm is controlled by the coil to press down or lift the cover body accordingly. The height of the support body adjacent to the first end may be greater than the height of the support body adjacent to the second end. The rubber cap is tilted.

According to some embodiments of the present invention, the swing arm may include a linkage assembly. The linkage assembly has a slider and a rotating column rotatably disposed on the slider. The slider is movably disposed on the swing arm to drive the rotating column to move on the swing arm. One end of the rotating column may be fixed to the top of the cover.

According to some embodiments of the present invention, the swing arm has a limit groove, and the rotating column moves in the limit groove so that the slider has a limited movement range, and the boundary value of the movement range indicates that the rubber cap is pressed down evenly, and the other boundary value of the movement range indicates that the rubber cap is not under downward pressure.

Accordingly, by controlling the squeezing conditions when the rubber cap is squeezed, the stress state of the rubber cap when squeezed can be substantially uniform, and there will be no situation where some parts of the rubber cap are squeezed excessively, so that the service life of the rubber cap in the electromagnetic air pump can be extended.

100: Oak cap

110: Cover

120: Support body

121: Buckle part

210: Platform

211: Platform surface

220: Air chamber

220’: Air chamber

230: Coil device

231: Coil set

300: Swing arms

310: First end

320: Second end

321: Magnetic components

330: Limiting slot

331: The first boundary

332: The second boundary

350: Linkage components

351: Slider

351’: Original slider position

352: Rotating column

352’: Rotating column original position

353: Rotating axis

A1: Location points

A1’: Location point

A2: Location points

A2’: Location point

B1: Location point

B1’: Location point

B2: Location points

B2’: Location point

C1: Location point

C2: Location point

DA1: Displacement change

DA2: Displacement change

DB1: displacement change

DB2: displacement change

DX1: Compression stroke

DX2: Compression stroke

H: Height

H1: Height

H2: Height

HD1: Height

HD2: Height

I: Airway input

O: Output airway

P: Downward pressure

Z: Central axis

θ: angle of inclination

[Figure 1] is a schematic cross-sectional view of the rubber cap of the electromagnetic air pump in an embodiment of the present invention when it is not compressed.

[Figure 2] is a cross-sectional diagram of the rubber cap of the embodiment of Figure 1 being compressed.

[Figure 3] is a three-dimensional schematic diagram of the rubber cap of the embodiment of Figure 1.

[Figure 4] is a cross-sectional schematic diagram of an electromagnetic air pump in an embodiment of the present invention.

[Figure 5] is a schematic cross-sectional view of the electromagnetic air pump in the first embodiment of the present invention when the swing arm is pressed down.

[Figure 6] is a schematic cross-sectional view of the electromagnetic air pump in the second embodiment of the present invention when the swing arm is pressed down.

[Figure 7] is a schematic cross-sectional view of the electromagnetic air pump in the third embodiment of the present invention when the swing arm is pressed down.

[Figure 8] is a schematic cross-sectional view of the electromagnetic air pump in the fourth embodiment of the present invention when the swing arm is pressed down.

[Figure 9] is a top view of the swing arm and rubber cap in the state of Figure 8.

[Figure 10] is a schematic cross-sectional view of the electromagnetic air pump in the fifth embodiment of the present invention when the swing arm is not pressed down.

[Figure 11] is a three-dimensional schematic diagram of a portion of the electromagnetic air pump in the state of Figure 10.

In order to fully understand the purpose, features and effects of the present invention, the present invention is described in detail through the following specific embodiments and the attached drawings, as follows:

In this article, the terms "include, include, have" or any other similar terms are not limited to the elements listed in this article, but may include other elements that are not explicitly listed but are generally inherent to the elements, structures, devices, parts or regions.

In this article, the words "first" or "second" and similar ordinal numbers are used to distinguish or refer to the same or similar elements or structures, and do not necessarily imply the spatial order of these elements, structures, devices, parts or regions. It should be understood that in certain situations or configurations, ordinal numbers can be used interchangeably without affecting the implementation of the present invention.

In this article, the term "a" or "an" is used to describe an element, structure, device, part or region, etc. This is only for the convenience of explanation and to provide a general meaning for the scope of the present invention. Therefore, unless it is obvious that it is otherwise intended, such description should be understood to include one or at least one, and the singular also includes the plural.

Please refer to Figures 1, 2 and 3 at the same time. Figure 1 is a cross-sectional schematic diagram of the rubber cap of the electromagnetic air pump in an embodiment of the present invention when it is not compressed, Figure 2 is a cross-sectional schematic diagram of the rubber cap of the embodiment of Figure 1 when it is compressed, and Figure 3 is a three-dimensional schematic diagram of the rubber cap of the embodiment of Figure 1.

In the electromagnetic air pump, the rubber cap 100 can be matched with the platform 210 by forming a lid shape, thereby defining the space of the air chamber 220. The air chamber 220 has an output air channel (not shown) for supplying air to the inflated object and an input air channel (not shown) for drawing external air. When the elastic and flexible rubber cap 100 is pressed down by the downward pressure P, the space of the air chamber 220 is compressed (air chamber 220'), and the pushed air is discharged from the output air channel to be delivered to the inflated object; on the other hand, after the downward pressure, the rubber cap 100 will be pulled up to restore the space of the air chamber 220, and at the same time, the external air is drawn into the air chamber 220 through the input air channel.

The rubber cap 100 may include a cover 110 and a support 120. The support 120 is used as the part where the rubber cap 100 abuts the platform 210. The cover 110 connected above the support 120 is usually used as the part to be pressed down, and as the part to provide the main deformation, so as to define a compressed air chamber 220' (see FIG. 2) or an uncompressed air chamber 220 (see FIG. 1) between the platform 210. Among them, the lower edge of the support 120 can be directly supported by the platform 210 (as shown in FIG. 1 and FIG. 2), or it can be used as a buckle part where the rubber cap 100 can be stably abutted on the platform 210 to further improve the airtightness, which will be mentioned in other subsequent embodiments. In some embodiments, the support body 120 may also produce a slight deformation when the cover body 110 is pressed down, but it will not substantially affect the overall airtightness.

When the rubber cap 100 is pressed down and pulled up, it needs to withstand the deformation degree brought about by the operation process, especially for the cover body 110 of the rubber cap 100, it needs to withstand a larger deformation. A part on the cover body 110 may have a displacement variation relative to the platform 210 when the cover body 110 is compressed and uncompressed. In order to improve the service life of the rubber cap 100, in this embodiment, the difference rate between the displacement variations of a pair of parts on the cover body 110 with geometric symmetry properties is limited to no more than 5%. Based on the configuration of the electromagnetic air pump and the control of the rubber cap 100 being pressed down and lifted, such a configuration provides boundary conditions to follow and helps the rubber cap to achieve a substantially uniform force effect. It is worth mentioning that at least one pair of parts with geometric symmetry properties on the cover 110 may also be the parts that bear the maximum deformation pressure. Such parts on the cover may usually have a relatively thick thickness or have a material property with higher elasticity at the same thickness.

The geometrically symmetrical parts on the cover 110 refer to two parts on the rubber cap 100 that are symmetrical with respect to the middle part. For example, for the typical rubber cap 100 with a disc shape as shown in FIG3, two parts A1 and A2 are geometrically symmetrical with respect to the central axis Z as the middle part; and two parts B1 and B2 are geometrically symmetrical with respect to the central axis Z as the middle part; and two parts C1 and C2 are geometrically symmetrical with respect to the central axis Z as the middle part. In other embodiments of the rubber cap 100 that is not in the typical disc shape of FIG3, geometrically symmetrical parts can also be defined. FIG3 is only an example and not a limitation.

Figures 1 and 2 are used to further illustrate the displacement changes of two points A1 and A2 and two points B1 and B2. When the cover 110 is compressed from an uncompressed state, point A1 of the cover 110 changes to the position of point A1', and its displacement change is DA1; similarly, point A2 of the cover 110 changes to the position of point A2', and its displacement change is DA2. Since point A1 and point A2 are a pair of geometrically symmetrical parts, displacement change DA1 and displacement change DA2 are a pair of displacement changes. Under the aforementioned boundary conditions, the difference rate (or degree of difference) between displacement change DA1 and displacement change DA2 shall not be greater than 5%.

Similarly, when the cover 110 is changed from an uncompressed state to a compressed state, the position point B1 of the cover 110 changes to the position of the position point B1', and its displacement change amount is DB1; similarly, the position point B2 of the cover 110 changes to the position of the position point B2', and its displacement change amount is DB2. Since the position point B1 and the position point B2 are a pair of geometrically symmetrical positions, the displacement change amount DB1 and the displacement change amount DB2 are a pair of displacement changes, and the difference rate between them must also be less than 5% so that the rubber cap 100 can achieve a substantially uniform force effect.

Next, please refer to FIG. 4, which is a cross-sectional schematic diagram of an electromagnetic air pump in an embodiment of the present invention. The electromagnetic air pump comprises: a rubber cap 100, a cylinder seat 200, and a swing arm 300. The first end 310 of the swing arm 300 is rotatably disposed on the cylinder seat 200, and the second end 320 of the swing arm 300 is provided with a magnetic element 321. The platform 210 of the cylinder seat 200 can define the space of the air chamber 220 with the rubber cap 100. When the coil in the coil device 230 is energized, an electromagnetic field can be generated, and the magnetic field changes between the coil and the magnetic element 321 as the power frequency changes, generating a force of mutual attraction or mutual repulsion. This force can push the swing arm 300 to perform a certain degree of repetitive rotation based on the first end 310, thereby generating a control action of pressing down the rubber cap 100 or lifting the rubber cap 100, so as to achieve a control method of compressing or expanding the air chamber.

In order to achieve a substantially uniform force effect on the rubber cap 100, when the rubber cap 100 is pressed down, the compression stroke DX1 of the first side adjacent to the first end 310 of the rubber cap 100 is controlled to be substantially the same as the compression stroke DX2 of the second side adjacent to the second end 320 of the rubber cap 100. On the other hand, under this configuration, the difference between the compression stroke DX1 and the compression stroke DX2 can be suppressed.

Next, please refer to FIG. 5, which is a cross-sectional schematic diagram of the electromagnetic air pump under the first embodiment of the present invention when the swing arm is pressed down. The main section of the swing arm 300 connected to the rubber cap 100 is in the shape of a straight long swing arm, and the matching condition between this section and the platform 210 defines the boundary condition that can achieve uniform force on the rubber cap. The swing arm 300 is used to press down the cover 110 of the rubber cap 100 through the connection to generate an air chamber 220' in a compressed state, wherein, when the electromagnetic air pump operates to make the swing arm 300 reach the maximum downward pressure, the angle θ between the platform 210 and the swing arm 300 needs to be less than 5 degrees. A surface for the rubber cap 100 can be defined on the platform 210, and the extension of this surface and the extension of the long swing arm 300 can form this angle θ. Through the definition of the angle θ, the rubber cap can achieve a substantially uniform force effect.

In the state of FIG. 5 , this is usually achieved by lowering the connection position between the cylinder base 200 and the first end 310 of the swing arm 300 (i.e., shortening the height H) or by changing the appearance of the first end 310 of the swing arm 300, so that the swing arm 300 can form a state close to parallel with the platform 210 as much as possible when reaching the maximum downward pressure (i.e., the angle θ is less than 5 degrees). This is mainly related to the state of the swing arm 300, and the state of FIG. 6 described below is mainly related to the state of the platform 210.

Next, please refer to FIG. 6, which is a cross-sectional schematic diagram of the electromagnetic air pump under the second embodiment of the present invention when the swing arm is pressed down. Compared with the embodiment of FIG. 5, the embodiment of FIG. 6 is mainly achieved by changing the height of the platform 210 of the cylinder base body 200 to achieve a state that is close to parallel with the platform 210 as much as possible when the swing arm 300 reaches the maximum downward pressure. As shown in FIG. 6, the height H1 of the platform surface 211 of the platform 210 of the cylinder base body 200 near the first end 310 is greater than the height H2 of the platform surface 211 near the second end 320. In terms of the cross-sectional view shown in FIG. 6, the platform surface 211 is in a state of an inclined surface.

In the embodiment of FIG. 6, by arranging the height of the platform surface 211 of the platform 210 of the cylinder base 200, the uneven pressure on the cover 110 of the rubber cap 100 when the swing arm 300 reaches the substantially maximum downward pressure can be eliminated. In other combined embodiments, the embodiments illustrated in FIG. 5 and FIG. 6 can also be adopted at the same time, so that the height difference requirement for the platform 210 of the cylinder base 200 can be looser and the adjustment of the swing arm 300 can also be looser to achieve a balance. Whether it is the embodiment illustrated in FIG. 5 or FIG. 6 or the combined embodiment of FIG. 5 and FIG. 6, the rubber cap 100 can achieve a substantially uniform force effect.

Next, please refer to FIG. 7, which is a cross-sectional schematic diagram of the electromagnetic air pump under the third embodiment of the present invention when the swing arm is pressed down. Compared with the embodiment of FIG. 6, the embodiment of FIG. 7 mainly changes the height change of the platform 210 of the cylinder base 200 by the height difference of the support body 120 of the rubber cap 100, so that when the swing arm 300 reaches the substantially maximum downward pressure, the rubber cap 100 can achieve a substantially uniform force effect. As shown in FIG. 7, the height HD1 of the support body 120 of the rubber cap 100 near the first end 310 is greater than the height HD2 near the second end 320. In terms of the cross-sectional view presented in FIG. 7, the rubber cap 100 is in a tilted state. In other words, the height of the rubber cap 100 near the first end 310 of the swing arm 300 is greater than the height near the second end 320 of the swing arm 300.

Next, please refer to FIG. 8 and FIG. 9 simultaneously. FIG. 8 is a cross-sectional schematic diagram of the electromagnetic air pump under the fourth embodiment of the present invention when the swing arm is pressed down, and FIG. 9 is a top view schematic diagram of the swing arm and the rubber cap under the embodiment of FIG. 8. In the embodiment of FIG. 8, the swing arm 300 further includes a linkage assembly 350. The linkage assembly 350 has a slide block 351 and a rotating column 352. The rotating column 352 can slide in the limiting groove 330 as the swing arm 300 rotates through the rotating shaft 353 and the limiting groove 330 of the swing arm 300. The sliding of the rotating column 352 in the limiting groove 330 is adaptive. That is, when the swing arm 300 is in the downward stroke, the rotating column 352 will slide to the right in the limit slot 330, and vice versa, when the swing arm 300 is in the upward stroke, the rotating column 352 will slide to the left in the limit slot 330. Accordingly, the rotating column 352 is rotatably arranged on the slider 351 through the rotating shaft 353, and the slider 351 is movably arranged on the swing arm 300 through the limit slot 330. When the slider 351 moves, it also drives the rotating column 352 to move on the swing arm 300, and one end of the rotating column 352 is fixed to the top of the cover 110.

As shown in FIG9 , as the swing arm 300 is pressed down, the rotating column 352 drives the slider 351 to slide rightward (toward the first end 310 of the swing arm 300) from the original position (slider original position 351', rotating column original position 352'). The length of the limiting groove 330 can be defined as the degree of movement of the slider 351 and the rotating column 352 being restricted.

In one embodiment, the first boundary 331 of the limiting groove 330 is a boundary value that allows the cover 110 to be evenly compressed. That is, based on the rotatability of the shaft 353 and the gradually increasing angle between the swing arm 300 and the top of the cover 110 when the swing arm 300 is pressed down, the shaft 353 will be able to slide adaptively toward the first end 310 of the swing arm 300. Accordingly, in terms of the limited movement degree provided by the limit groove 330 to the rotating shaft 353, the first boundary 331 can be configured as a boundary value that allows the cover 110 to be pressed down evenly when the swing arm 300 reaches the substantially maximum downward pressure; on the other hand, the second boundary 332 can be configured as a boundary value when the cover 110 is not subjected to downward pressure after the swing arm 300 is pulled up.

There is a synergistic combination between the various implementations mentioned above. In addition to the combination of the implementations of the examples of Figure 5 and Figure 6, the implementation of Figure 7 can also be combined with the implementation of Figure 5 or Figure 6, or with both Figure 5 and Figure 6. In addition, the implementation of Figure 8 can also be selectively combined with the implementations of Figure 5, Figure 6 and Figure 7. The application of these combinations can all be used to achieve a substantially uniform force effect on the rubber cap.

Please refer to Figures 10 and 11 at the same time. Figure 10 is a cross-sectional schematic diagram of the electromagnetic air pump in the fifth embodiment of the present invention when the swing arm is not pressed down, and Figure 11 is a three-dimensional schematic diagram of a portion of the electromagnetic air pump in the state of Figure 10. In order to make the diagram concise, only the symbols of the components on one side are marked in Figure 11.

The embodiment of FIG. 10 and FIG. 11 is based on the embodiment of FIG. 6 and is an embodiment of using multiple rubber cap groups to improve the efficiency of the electromagnetic air pump. As shown in FIG. 10 and FIG. 11, the electromagnetic air pump includes: a cylinder seat 200, a rubber cap group, a swing arm group, and a coil group 231. The cylinder seat 200 has two platforms 210 arranged on opposite sides. The rubber cap 100 includes two rubber caps 100 respectively arranged on the corresponding platforms 210 on the opposite sides of the cylinder seat 200. Each rubber cap 100 defines an air chamber 220 by the bottom and the corresponding platform 210 against which it abuts. Among them, in the examples of Figures 10 and 11, the supporting body 120 of the rubber cap 100 has a buckle portion 121 to stably abut on the platform 210, and define the space of the air chamber 220 with the upper surface of the platform 210. The air chamber 220 has an output air channel O for supplying air to the inflated object and an input air channel I for drawing external air.

The swing arm assembly includes two swing arms 300, and the first end 310 of each swing arm 300 is rotatably disposed on the cylinder base 200. The second end 320 of each swing arm 300 is provided with a magnetic element 321. Each swing arm 300 is connected to a corresponding rubber cap 100, so that the coil assembly 231 facing the magnetic element 321 generates a magnetic force after the coil assembly 231 is energized to rotate each swing arm 300 to compress or pull up each rubber cap accordingly, thereby causing the air chamber 220 to be compressed (the pushed air is discharged from the output air channel O) or expanded (the external air is drawn in through the input air channel I).

In the embodiment of FIG. 10 , the platform surfaces 211 of the two platforms 210 of the cylinder base 200 are not parallel to each other (as can be further seen from FIG. 11 ). Correspondingly, as in the basic embodiment of FIG. 6 , this enables each rubber cap 100 to achieve substantially uniform force when being compressed by the rotation of the swing arm 300 .

In summary, by regulating the control method of the rubber cap, when the electromagnetic air pump is in operation, the rubber cap can be substantially evenly stressed when it is compressed or pulled up, which also prolongs the service life of the rubber cap, reduces the failure rate of the rubber cap, and improves the availability of the electromagnetic air pump.

The present invention has been disclosed in the above text with a preferred embodiment, but those familiar with the present technology should understand that the embodiment is only used to describe the present invention and should not be interpreted as limiting the scope of the present invention. It should be noted that all changes and substitutions equivalent to the embodiment should be included in the scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the patent application.

100: Oak cap

110: Cover

120: Support body

210: Platform

220’: Air chamber

A1: Location points

A1’: Location point

A2: Location points

A2’: Location point

B1: Location point

B1’: Location point

B2: Location points

B2’: Location point

DA1: Displacement change

DA2: Displacement change

DB1: displacement change

DB2: displacement change

P: Downward pressure

Z: Central axis

Claims (19)

An electromagnetic air pump comprises: a swing arm driven by a force generated by an electromagnetic field; and A compressible or expandable air chamber is defined by a platform surface and a rubber cap that can be pressed down by the swing arm. The rubber cap includes a support body and a cover body. When the electromagnetic air pump is in operation, the cover body is configured to bear against the support body with the platform surface when pressed down by the swing arm. The cover body defines a plurality of pairs of geometrically symmetrical parts. When the air chamber is compressed or expanded, each pair of geometrically symmetrical parts has a pair of displacement changes relative to the platform surface. When at least one pair of geometrically symmetrical parts is subjected to the maximum deformation pressure, the difference between the pair of displacement changes corresponding to the at least one pair of geometrically symmetrical parts is not more than 5%, so as to achieve the effect of substantially uniform force on each pair of geometrically symmetrical parts. The electromagnetic air pump as described in claim 1 further includes a cylinder base having the platform surface, a first end of the swing arm is rotatably disposed on the cylinder base, and when the swing arm presses down on the cover body to compress the air chamber, the angle between the platform surface and the swing arm is less than 5 degrees. An electromagnetic air pump as described in claim 1, further comprising a cylinder seat body having the platform surface, a first end of the swing arm being rotatably disposed on the cylinder seat body, a magnetic element being disposed on a second end of the swing arm opposite to the first end, so that the swing arm is controlled by a coil to press down or lift the cover body accordingly, the height of the platform surface of the cylinder seat body adjacent to the first end is greater than the height of the platform surface adjacent to the second end, and the platform surface is an inclined surface. An electromagnetic air pump as described in claim 1, further comprising a cylinder base having the platform surface, a first end of the swing arm being rotatably disposed on the cylinder base, a magnetic element being disposed on a second end of the swing arm opposite to the first end, so that the swing arm is controlled by a coil to press down or lift the cover body accordingly, a height of the support body adjacent to the first end is greater than a height of the support body adjacent to the second end, and the rubber cap is in a tilted state. An electromagnetic air pump as described in claim 1, wherein the swing arm includes a linkage assembly, the linkage assembly having a slider and a rotating column rotatably disposed on the slider, the slider is movably disposed on the swing arm to drive the rotating column to move on the swing arm, and one end of the rotating column is fixed to the top of the cover. An electromagnetic air pump as described in claim 5, wherein the swing arm has a limit groove, and the rotating column moves in the limit groove so that the slider has a limited movement range, a boundary value of the movement range indicates that the cover body is pressed down evenly, and another boundary value of the movement range indicates that the cover body is not subjected to downward pressure. An electromagnetic air pump comprises: a cylinder seat having a platform; a rubber cap including a support body and a cover body, wherein an air chamber is defined between the support body and the cover body and the platform; and a swing arm, wherein a first end of the swing arm is rotatably disposed on the cylinder seat body, and a second end of the swing arm is provided with a magnetic element for the swing arm to be controlled by a coil to press down or pull up the rubber cap accordingly, wherein the cover body defines a plurality of pairs of geometrically symmetrical parts, and when the rubber cap is pressed down or pulled up and at least one pair of geometrically symmetrical parts is subjected to the maximum deformation pressure, the forces of the two geometrically symmetrical parts of the at least one pair of geometrically symmetrical parts in the corresponding deformation stroke are substantially the same. An electromagnetic air pump as described in claim 7, wherein when the swing arm presses down on the rubber cap to complete a compression process, the angle between the platform and the swing arm is less than 5 degrees. An electromagnetic air pump as described in claim 7, wherein the height of the platform of the cylinder base body near the first end of the swing arm is greater than the height of the platform near the second end of the swing arm, and the platform is an inclined surface. An electromagnetic air pump as described in claim 7, wherein the height of the rubber cap near the first end of the swing arm is greater than the height of the rubber cap near the second end of the swing arm, and the rubber cap is in a tilted state. An electromagnetic air pump as described in claim 7, wherein the swing arm includes a linkage assembly, the linkage assembly having a slider and a rotating column rotatably disposed on the slider, the slider is movably disposed on the swing arm to drive the rotating column to move on the swing arm, and one end of the rotating column is fixed to the top of the rubber cap. An electromagnetic air pump as described in claim 11, wherein the swing arm has a limit groove, and the rotating column moves in the limit groove so that the slider has a limited movement range, a boundary value of the movement range is used to make the rubber cap be pressed down evenly, and the other boundary value of the movement range is used to prevent the rubber cap from being subjected to downward pressure. An electromagnetic air pump as described in claim 7, wherein the at least one pair of geometrically symmetrical parts each have a pair of displacement changes relative to the platform, and the difference between the pair of displacement changes corresponding to the two geometrically symmetrical parts in the deformation stroke is no more than 5%. An electromagnetic air pump comprises: A cylinder seat body having two platforms arranged on opposite sides; A rubber cap assembly comprising two rubber caps respectively arranged on corresponding platforms on opposite sides of the cylinder seat body, each of the rubber caps comprising a support body and a cover body and defining an air chamber with the corresponding platform abutting against the corresponding support body and the cover body; A swing arm assembly comprising two swing arms, a first end of each swing arm being rotatably arranged on the cylinder seat body, a second end of each swing arm being provided with a magnetic element, and each swing arm being connected to the corresponding rubber cap; and A coil assembly facing the magnetic elements and used to generate magnetic force after power is supplied to rotate each swing arm, so as to press down or lift each rubber cap accordingly, Each of the cover bodies defines a plurality of pairs of geometrically symmetrical parts, and the platform surfaces of the two platforms of the cylinder seat body are not parallel to each other so that when each of the rubber caps is pressed down or pulled up by the swing arm rotation, causing at least one pair of geometrically symmetrical parts to be subjected to the maximum deformation pressure, the forces on the two parts of the at least one pair of geometrically symmetrical parts in the corresponding deformation stroke are roughly the same, so that each of the rubber caps is substantially subjected to uniform force. An electromagnetic air pump as described in claim 14, wherein when the rubber cap corresponding to each swing arm is pressed down to complete a compression process, the angle between each swing arm and the corresponding platform is less than 5 degrees. An electromagnetic air pump as described in claim 14, wherein the height of each platform adjacent to the first end of the corresponding swing arm is greater than the height of the second end of the corresponding swing arm. An electromagnetic air pump as described in claim 14, wherein the swing arm includes a linkage assembly, the linkage assembly having a slider and a rotating column rotatably disposed on the slider, the slider is movably disposed on the swing arm to drive the rotating column to move on the swing arm, and one end of the rotating column is fixed to the top of the rubber cap. An electromagnetic air pump as described in claim 17, wherein the swing arm has a limit groove, and the rotating column moves in the limit groove so that the slider has a limited movement range, a boundary value of the movement range is used to make the rubber cap be pressed down evenly, and the other boundary value of the movement range is used to prevent the rubber cap from being subjected to downward pressure. An electromagnetic air pump as described in claim 14, wherein in each of the cover bodies, at least one pair of geometrically symmetrical parts each has a pair of displacement changes relative to the platform, and a difference rate between the pair of displacement changes corresponding to the two geometrically symmetrical parts in the deformation stroke is not greater than 5%.

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