TWI506206B - Heat sink and its airflow generator - Google Patents

Description

Heat sink and its airflow generator

The present invention relates to a heat dissipating device, and more particularly to a heat dissipating device for dissipating heat generated electronic components in an electronic device and an airflow generator therefor.

In electronic devices such as notebook computers, a heat sink is often used to dissipate heat from internal electronic components such as the CPU. The heat dissipating device comprises a heat dissipating fan and a heat sink group. The heat dissipating fins are disposed at an outlet of the heat dissipating fan and are thermally connected to the electronic component by a heat pipe. The heat generated by the electronic components is transferred from the heat pipe to the heat sink group, and the heat sink fan operates to generate an air flow and blows toward the heat sink group to carry away the heat transferred to the heat sink group.

However, when the cooling fan is operated at a relatively high speed, noise is easily generated and it is possible to cause unstable operation. In addition, in the cooling fan, in order to achieve a certain amount of air, the motor must have a corresponding size, which cannot meet the requirements for the development of the electronic device toward the thin and light.

In view of the above, it is necessary to provide a gas flow generator suitable for miniaturization design and having a good mute effect, and to provide a heat sink using the gas flow generator.

An airflow generator includes at least one airflow generating unit, each airflow generating unit includes a casing, a first diaphragm, a second diaphragm, a first driving component, a second driving component, and a nozzle. a diaphragm and a second diaphragm are disposed in the casing and partition the space in the casing into a first chamber, a second chamber and a third chamber, wherein the first chamber is located in the first diaphragm Between the second diaphragms, the second chamber and the third chamber are respectively located at two sides of the first chamber, and the first chamber and the second chamber are separated by the first diaphragm, and the first chamber is separated from the first chamber The third chambers are separated by a second diaphragm disposed on one side of the box and disposed in the first chamber and communicating the first chamber with the outside. The first driving member is disposed on the first driving unit. a first moving magnet on the first diaphragm and a first fixed magnet disposed on the box and disposed opposite to the first moving magnet, the second driving member including a second disposed on the second diaphragm a moving magnet and a second fixed magnet disposed on the box and disposed opposite to the second moving magnet, when the first diaphragm and the second Films are under the effect of driving the first driving member and the second member when moved toward each other, the first diaphragm and a second diaphragm chamber of the first compressed gas and a gas stream produced by the nozzle outwardly.

A heat dissipating device includes a heat sink and a gas flow generator, wherein the heat sink is provided with a plurality of air flow passages, the air flow generator includes at least one air flow generating unit, and each air flow generating unit comprises a box body and a first diaphragm a second diaphragm, a first driving member, a second driving member and a nozzle, the first diaphragm and the second diaphragm are spaced apart from each other in the housing and partition the space in the housing into a first chamber, a second chamber and a third chamber, the first chamber is located between the first diaphragm and the second diaphragm, and the second chamber and the third chamber are respectively located at two sides of the first chamber, The first chamber and the second chamber are separated by a first diaphragm, and the first chamber and the third chamber are separated by a second diaphragm. The nozzle is disposed on one side of the box and corresponds to the first a first chamber is disposed on the first diaphragm and is disposed on the box and disposed opposite to the first moving magnet. The first driving member includes a first moving magnet disposed on the first diaphragm. a first fixed magnet, the second driving member includes a second moving magnet disposed on the second diaphragm and disposed on a second fixed magnet disposed on the body opposite to the second moving magnet. When the first diaphragm and the second diaphragm move toward each other under the action of the first driving member and the second driving member, the first diaphragm And a second diaphragm compresses the gas in the first chamber and generates a gas flow which is outwardly ejected from the nozzle, wherein the nozzle of the airflow generating unit of the airflow generator is disposed opposite to the radiator, and the airflow from the nozzle of the airflow generating unit flows Inside the airflow passage of the radiator.

A heat sink includes a heat sink, a first airflow generator, and a second airflow generator disposed away from the first airflow generator. A plurality of airflow channels are disposed in the heat sink, and the first airflow generator and the second airflow generator each include at least one airflow generating unit, each airflow generating unit includes a casing, a first diaphragm, and a second vibration. a membrane, a first driving member, a second driving member and a nozzle, wherein the first diaphragm and the second diaphragm are spaced apart from each other in the housing and partition the space in the housing into a first chamber and a second chamber. a third chamber, the first chamber is located between the first diaphragm and the second diaphragm, and the second chamber and the third chamber are respectively located at two sides of the first chamber, the first chamber and the first chamber The two chambers are separated by a first diaphragm, and the first chamber and the third chamber are separated by a second diaphragm which is disposed on one side of the box and is disposed in the first chamber and The first driving device is connected to the outside, and the first driving component comprises a first moving magnet disposed on the first diaphragm and a first fixed magnet disposed on the housing and disposed opposite to the first moving magnet The second driving component includes a second moving magnet disposed on the second diaphragm and disposed on the housing and magnetically coupled to the second a second fixed magnet disposed oppositely, when the first diaphragm and the second diaphragm move toward each other under the action of the first driving member and the second driving member, respectively, the first diaphragm and the second diaphragm are compressed first The gas in the chamber generates a gas stream which is ejected outwardly from the nozzle, and the nozzle of the airflow generating unit of the first airflow generator is disposed opposite to the radiator, and the nozzle of the airflow generating unit of the second airflow generator faces away from the radiator Settings.

In the airflow generator, the first diaphragm and the second driving member respectively drive the first diaphragm and the second diaphragm to generate airflow, and the motor, the rotor and the like are not required to be disposed like the cooling fan, so that the airflow generator has better Silent effect. The airflow generator has a simple structure and is suitable for a thin design.

1 to 4 show a preferred embodiment of the heat sink 100 of the present invention. The heat sink 100 includes an airflow generator 10 and a heat sink 20. The airflow generator 10 includes a housing 11 and a plurality of airflow generating units 12 disposed in the housing 11. The airflow generating units 12 are stacked in the horizontal direction.

Each of the airflow generating units 12 includes a rectangular parallelepiped casing 120, a first diaphragm 121, a second diaphragm 122, a first driving member 13, a second driving member 14, and a nozzle 123. The first diaphragm 121 and the second diaphragm 122 are disposed in the casing 120, and the first diaphragm 121 and the second diaphragm 122 are spaced apart from each other and are parallel to each other, thereby the inside of the casing 120. The space is isolated into three chambers, that is, a first chamber 124 between the first diaphragm 121 and the second diaphragm 122, a second chamber 125 above the first diaphragm 121, and A third chamber 126 below the second diaphragm 122. The first diaphragm 121 is located between the first chamber 124 and the second chamber 125 and isolates the first chamber 124 from the second chamber 125. The second diaphragm 122 is located in the first chamber 124 and the first chamber The three chambers 126 isolate the first chamber 124 from the third chamber 126. The first diaphragm 121 and the second diaphragm 122 are separated by a first distance H1. The first diaphragm 121 and the second diaphragm 122 are both made of an elastic material, and can generate upper and lower vibrations under the action of an external force.

The first driving member 13 includes a first moving magnet 131 and a first fixed magnet 132. The first moving magnet 131 is disposed at a middle portion of the upper surface of the first diaphragm 121, and the first fixed magnet 132 is located at the second chamber. 125 is disposed on the inner surface of the upper plate of the casing 120. The first fixed magnet 132 is disposed above and below the first moving magnet 131, and the first fixed magnet 132 and the first moving magnet 131 are separated by a second distance H2. The second driving member 14 includes a second moving magnet 141 and a second fixed magnet 142. The second moving magnet 141 is disposed at a middle portion of the lower surface of the second diaphragm 122, and the second fixed magnet 142 is located at the third chamber. The inner surface of the lower plate of the casing 120 is disposed in the chamber 126. The second fixed magnet 142 and the second moving magnet 141 are disposed opposite to each other, and the second fixed magnet 142 and the second moving magnet 141 are separated by a third distance H3. The third distance H3 between the second fixed magnet 142 and the second moving magnet 141 is equal to the second distance H2 between the first moving magnet 131 and the first fixed magnet 132, and the second distance H2 and the third distance H3 Both are smaller than the first distance H1 between the first diaphragm 121 and the second diaphragm 122.

In this embodiment, the first moving magnet 131 of the first driving member 13 and the second moving magnet 141 of the second driving member 14 are all electromagnets, and the first fixed magnet 132 and the second driving of the first driving member 13 The second fixed magnets 142 of the member 14 are all permanent magnets. The first moving magnet 131 includes a piece of iron core 1311 and a coil 1312 surrounding the core 1311. The iron core 1311 is made of a material that is easily magnetized and easily disappears from magnetic properties such as soft iron or neodymium steel. The coil 1312 is disposed on the first diaphragm 121 and surrounds the core 1311. The coil 1312 can also be directly wound on the core 1311. The second moving magnet 141 includes a core 1411 and a coil 1412 surrounding the core 1411. The iron core 1411 is also made of a material that is easily magnetized and easily disappears from magnetic properties such as soft iron or barium steel. The coil 1412 is disposed on the second diaphragm 122 and surrounds the core 1411. The coil 1412 can also be directly wound on the core 1411. When all of the airflow generating units 12 of the airflow generator 10 are assembled together, the coils 1312 of the first driving member 13 of the airflow generating units 12 are connected in series with each other and connected to an external control circuit, and the airflow generating units 12 The coils 1412 of the second drive member 14 are also connected in series with each other and to the external control circuit.

The nozzle 123 is disposed at an end of the casing 120 adjacent to the radiator 20 and is disposed corresponding to the first chamber 124 of the casing 120. The nozzle 123 is provided with an outwardly tapered flow passage 1231. The inner end of the flow passage 1231 communicates with the first chamber 124 of the casing 120.

An opening 111 is disposed on a side of the housing 11 adjacent to the heat sink 20. The airflow generating unit 12 is mounted in the housing 11 from the opening 111. The airflow generating unit 12 is fixed by the housing 11 together. In other embodiments, the airflow generating units 12 may also be secured together by other means, such as bonding or gluing.

The heat sink 20 includes a plurality of fins 21 stacked in a horizontal direction, and an air flow passage 22 is formed between the adjacent fins 21. When the heat sink 20 is combined with the airflow generator 10, the nozzle 123 of the airflow generating unit 12 is disposed opposite to the airflow passage 22 of the radiator 20, and the outer end of the flow passage 1231 of the nozzle 123 is spaced from the inlet of the airflow passage 22. a predetermined distance.

When the airflow generator 10 is in operation, respectively, in the coil 1312 of the first moving magnet 131 of the first driving member 13 of the airflow generating unit 12 and the coil 1412 of the second moving magnet 141 of the second driving member 14, respectively A periodically varying current is supplied to magnetize the iron core 1311 of the first moving magnet 131 of the first driving member 13 and the iron core 1411 of the second moving magnet 141 of the second driving member 14, respectively. The core 1311 of the first moving magnet 131 and the core 1411 of the second moving magnet 141 are magnetized and respectively coupled to the first fixed magnet 132 of the first driving member 13 and the second fixed magnet 142 of the second driving member 14 A strong attraction or repulsion is generated to drive the first diaphragm 121 and the second diaphragm 122 to move toward each other or to move back to repeatedly compress the gas in the first chamber 124 of the casing 120. It is pushed into the flow path 1231 of the nozzle 123, thereby periodically generating an air flow at the outer end of the nozzle 123 and ejecting it toward the heat sink 20. The air flow flows forward and enters the air flow passage 22 of the radiator 20 to exchange heat with the heat sink 21, thereby carrying away heat transferred to the heat sink 21.

Referring to FIGS. 5-7, the flow generation process will be specifically described below with a single motion cycle of the single airflow generating unit 12.

The process of generating airflow is divided into three phases. As shown in FIG. 5, in the first stage, the direction in which the current is supplied to the coil 1312 of the first moving magnet 131 is positive (or negative), and the core 1311 of the first moving magnet 131 is magnetized, and the core The two ends of the 1311 and the first fixed magnet 132 are the same in polarity, that is, the polarity of the end of the iron core 1311 near the first fixed magnet 132 is the same as the polarity of the end of the first fixed magnet 132 near the core 1311, so that the first moving magnet 131 and the first fixed magnet 132 repel each other. Since the first fixed magnet 132 is fixed on the casing 120, the first moving magnet 131 moves away from the first fixed magnet 132 under the action of the repulsive force, so that the first moving magnet 121 drives the first diaphragm 121 toward the second vibration. The membrane 122 moves. At the same time, the direction in which the current is supplied to the coil 1412 of the second moving magnet 141 is forward (or negative), and after the core 1411 of the second moving magnet 141 is magnetized, the core 1411 and the second fixed magnet 142. The polarities of the two ends that are close to each other are the same, that is, the polarity of one end of the iron core 1411 near the second fixed magnet 142 is the same as the polarity of the end of the second fixed magnet 142 near the iron core 1411, so that the second moving magnet 141 and the second fixed magnet 142 are the same. Mutually exclusive. Since the second fixed magnet 142 is fixed on the casing 120, the second moving magnet 141 moves away from the second fixed magnet 142 under the repulsive force, so that the second moving magnet 122 moves the second diaphragm 122 toward the first vibration. The membrane 121 moves. In other words, under the action of the first driving member 13 and the second driving member 14, the first diaphragm 121 and the second diaphragm 122 simultaneously move toward each other, thereby collectively compressing the first chamber 124.

As shown in FIG. 5, during the movement of the first diaphragm 121 and the second diaphragm 122 from the initial horizontal position to the positions indicated by the broken lines 121a and 122a in the figure, the gas in the first chamber 124 is compressed and directed. The flow path 1231 of the nozzle 123 moves to form a first air flow 31 having a higher speed at the outlet of the nozzle 123 and is blown toward the heat sink 20, and the first air flow 31 is advanced along the air flow passage 22 between the fins 21. The movement is performed and heat exchange is performed with the fins 21 to carry away the heat transferred to the fins 21.

In the second stage, the direction in which the current is applied to the coil 1312 of the first moving magnet 131 is reversed, and after the core 1311 of the first moving magnet 131 is magnetized, the ends of the core 1311 and the first fixed magnet 132 are close to each other. The polarity is opposite, that is, the polarity of the end of the iron core 1311 near the first fixed magnet 132 is opposite to the polarity of the end of the first fixed magnet 132 close to the iron core 1311, so that the first moving magnet 131 and the first fixed magnet 132 attract each other. Since the first fixed magnet 132 is fixed on the casing 120, the first moving magnet 131 moves toward the first fixed magnet 132 under the action of the suction force, so that the first moving magnet 121 drives the first diaphragm 121 back to the second vibration. The membrane 122 moves. At the same time, the direction in which the current is supplied to the coil 1412 of the second moving magnet 141 is also reversed, and after the core 1411 of the second moving magnet 141 is magnetized, the ends of the core 1411 and the second fixed magnet 142 are close to each other. The polarity is opposite, that is, the polarity of one end of the iron core 1411 near the second fixed magnet 142 is opposite to the polarity of the end of the second fixed magnet 142 near the iron core 1411, so that the second moving magnet 141 and the second fixed magnet 142 are attracted to each other. Since the second fixed magnet 142 is fixed on the casing 120, the second moving magnet 141 moves toward the second fixed magnet 142 under the action of the suction force, so that the second moving magnet 122 moves the second diaphragm 122 away from the first vibration. The membrane 121 moves. In other words, under the action of the first driving member 13 and the second driving member 14, the first diaphragm 121 and the second diaphragm 122 are simultaneously moved back.

When the first diaphragm 121 and the second diaphragm 122 are moved back to the horizontal position shown in FIG. 6 by the position shown by the broken lines 121a, 122a in FIG. 5, the first airflow entering the air flow passage 22 of the radiator 20 is entered. 31 continues to move forward while air surrounding the nozzle 123 is drawn into the airflow passage 22 of the radiator 20 to form a second airflow 32 that can flow up to ten times the first airflow 31.

In the third stage, under the action of the first driving member 13 and the second driving member 14, the first diaphragm 121 and the second diaphragm 122 continue to move back, and move from the horizontal position shown in FIG. 6 to FIG. 7. The position shown by the broken lines 121b and 122b. During this process, the volume of the first chamber 124 is expanded, and cold air around the nozzle 123 is drawn into the first chamber 124 via the nozzle 123 (as indicated by arrow 33 in Fig. 7) for the next motion cycle. The second airflow 32, which is used in the airflow passage 22 of the radiator 20, continues to move forward. Thereafter, the direction in which the current is supplied to the coil 1312 of the first moving magnet 131 and the direction in which the current is supplied to the coil 1412 of the second moving magnet 141 are reversed again, thereby proceeding to the first stage of the next cycle.

For each airflow generating unit 12, in order to reduce the mutual interference between the first moving magnet 131 and the second driving member 14 of the first driving member 13 during the airflow generation, the first diaphragm 121 and the second diaphragm 122 The first distance H1 between the two is preferably more than twice the second distance H2 between the first moving magnet 131 and the first fixed magnet 132. Similarly, in order to reduce the mutual interference between the second moving magnet 141 of the second driving member 14 and the first driving member 13 during the airflow generation, the first distance between the first diaphragm 121 and the second diaphragm 122 H1 is preferably twice or more the second distance H2 between the second moving magnet 141 and the second fixed magnet 142.

During the generation of the airflow, the periodically varying current flowing into the coil 1312 of the first moving magnet 131 and the coil 1412 of the second moving magnet 141 may be a pulse current. Thus, in the second and third stages, the current in the coil 1312 of the first moving magnet 131 and the coil 1412 of the second moving magnet 141 is zero, so that the core 1311 and the second moving magnet of the first moving magnet 131 The core 1411 of the 141 is demagnetized, and the first diaphragm 121 and the second diaphragm 122 will complete the second stage of motion under the restoring force and complete the third stage of motion by inertia.

In the airflow generating unit 12, the position of the first moving magnet 131 of the first driving member 13 and the first fixed magnet 132 are interchanged, while the positional relationship of the components of the second driving member 14 is maintained, or the second driving member is The position of the second moving magnet 141 and the second fixed magnet 142 of 14 is interchanged, while maintaining the positional relationship of the elements of the first driving member 13 or the first moving magnet 131 of the first driving member 13 and the first fixed magnet The positional exchange of 132 and the position of the second moving magnet 141 of the second driving member 14 and the second fixed magnet 142 are also interchanged, and the above-described airflow generating process can be realized.

In the airflow generating unit 12, the first diaphragm 121 and the second diaphragm can be adjusted by adjusting the frequency and magnitude of the current flowing into the coil 1312 of the first moving magnet 131 and the coil 1412 of the second moving magnet 141. The vibration period and amplitude of 122, thereby controlling the flow rate of the generated airflow, so that the airflow is fully utilized.

In addition, in order to prevent electromagnetic interference (EMI) from being generated on the electronic components located outside the casing 120 when the current is applied to the coil 1312 of the first moving magnet 131 and the coil 1412 of the second moving magnet 141, the second chamber is provided. The inner wall of the 125 and the inner wall of the third chamber 126 are respectively coated with a metal coating layer 1251 and 1261 which are resistant to electromagnetic interference.

In the heat sink 100, the airflow is supplied by the airflow generator 10 to blow the heat sink 20 to remove the heat of the heat sink 20. The number of airflow generating units 12 in the airflow generator 10 can be selected as desired. The airflow generating unit 12 does not need to be provided with a motor, a rotor or the like like a cooling fan, and therefore has a good mute effect. The airflow generating unit 12 has a simple structure and is suitable for miniaturization design.

Another embodiment of the heat sink 100a of the present invention is shown in FIG. The heat dissipating device 100a of the present embodiment is different from the heat dissipating device 100 shown in FIG. 1 to FIG. 4 in that an airflow generator is additionally added on the basis of the heat dissipating device 100, that is, the heat dissipating device 100a includes a heat sink 20 and an airflow generator. 10 and another airflow generator 10a. The increased airflow generator 10a has the same structure as the airflow generator 10, and also includes a plurality of airflow generating units 12 stacked in the horizontal direction. The increased airflow generator 10a is disposed opposite and opposite to the airflow generator 10, that is, the nozzle 123 of each airflow generating unit 12 of the airflow generator 10a and the nozzle 123 of each airflow generating unit 12 of the airflow generator 10. The direction is reversed so that it can be vented from both directions.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

100, 100a‧‧‧ heat sink

10, 10a‧‧‧ airflow generator

11‧‧‧Shell

111‧‧‧ openings

12‧‧‧Airflow generating unit

120‧‧‧ cabinet

121‧‧‧First diaphragm

122‧‧‧second diaphragm

121a, 121b, 122a, 122b‧‧‧ dotted lines

123‧‧‧Nozzles

1231‧‧‧ runner

124‧‧‧First chamber

125‧‧‧Second chamber

1251, 1261‧‧‧metal coating layer

126‧‧‧ third chamber

13‧‧‧First drive

131‧‧‧First motion magnet

1311, 1411‧‧‧ iron core

1312, 1412‧‧‧ coil

132‧‧‧First fixed magnet

14‧‧‧second drive

141‧‧‧Second moving magnet

142‧‧‧Second fixed magnet

20‧‧‧ radiator

21‧‧‧ Heat sink

22‧‧‧Air passage

31‧‧‧First airflow

32‧‧‧Second airflow

33‧‧‧ arrow

H1‧‧‧first distance

H2‧‧‧Second distance

H3‧‧‧ third distance

1 is a schematic view showing a combination of a heat sink device according to a preferred embodiment of the present invention.

2 is an exploded perspective view of the heat sink shown in FIG. 1.

Figure 3 is a view of the heat sink shown in Figure 2 from another angle.

Figure 4 is a cross-sectional view of the heat sink of Figure 1 taken along line IV-IV.

FIG. 5 is a schematic view showing the working process of the heat sink of FIG. 1. FIG.

FIG. 6 is still another schematic diagram showing the operation of the heat sink shown in FIG. 1. FIG.

FIG. 7 is still another schematic diagram showing the operation of the heat sink shown in FIG. 1. FIG.

Figure 8 is a perspective assembled view of another embodiment of the heat sink of the present invention.

11‧‧‧Shell

12‧‧‧Airflow generating unit

120‧‧‧ cabinet

121‧‧‧First diaphragm

122‧‧‧second diaphragm

123‧‧‧Nozzles

1231‧‧‧ runner

124‧‧‧First chamber

125‧‧‧Second chamber

1251, 1261‧‧‧metal coating layer

126‧‧‧ third chamber

13‧‧‧First drive

131‧‧‧First motion magnet

1311, 1411‧‧‧ iron core

1312, 1412‧‧‧ coil

132‧‧‧First fixed magnet

14‧‧‧second drive

141‧‧‧Second moving magnet

142‧‧‧Second fixed magnet

21‧‧‧ Heat sink

22‧‧‧Air passage

H1‧‧‧first distance

H2‧‧‧Second distance

H3‧‧‧ third distance

Claims (10)

An airflow generator includes at least one airflow generating unit, each airflow generating unit includes a casing, a first diaphragm, a second diaphragm, a first driving component, a second driving component, and a nozzle. a diaphragm and a second diaphragm are disposed in the casing and partition the space in the casing into a first chamber, a second chamber and a third chamber, wherein the first chamber is located in the first diaphragm Between the second diaphragms, the second chamber and the third chamber are respectively located at two sides of the first chamber, and the first chamber and the second chamber are separated by the first diaphragm, and the first chamber is separated from the first chamber The third chambers are separated by a second diaphragm disposed on one side of the box and disposed in the first chamber and communicating the first chamber with the outside. The first driving member is disposed on the first driving unit. a first moving magnet on the first diaphragm and a first fixed magnet disposed on the box and disposed opposite to the first moving magnet, the second driving member including a second disposed on the second diaphragm a moving magnet and a second fixed magnet disposed on the box and disposed opposite to the second moving magnet, when the first diaphragm and the second Films are under the effect of driving the first driving member and the second member when moved toward each other, the first diaphragm and a second diaphragm chamber of the first compressed gas and a gas stream produced by the nozzle outwardly. The airflow generator of claim 1, wherein one of the first moving magnet and the first fixed magnet is an electromagnet, and the other is a permanent magnet, wherein the second moving magnet and the second fixed magnet are One is an electromagnet and the other is a permanent magnet. The airflow generator of claim 2, wherein the first moving magnet is an electromagnet, the first fixed magnet is a permanent magnet, the second moving magnet is an electromagnet, and the second fixed magnet is a permanent magnet. . The airflow generator of claim 3, wherein the first moving magnet comprises a piece of iron core disposed on the second diaphragm and a coil surrounding the core. The airflow generator of claim 3, wherein the second moving magnet comprises a piece of iron core disposed on the first diaphragm and a coil surrounding the core. The airflow generator of claim 1, wherein the first diaphragm and the second diaphragm are disposed in parallel with each other, and the first diaphragm and the second diaphragm are separated by a first distance, the first fixed The magnet and the first moving magnet are separated by a second distance, and the second fixed magnet and the second moving magnet are separated by a third distance, and the second distance and the third distance are both smaller than the first distance. The airflow generator of claim 1, wherein the inner wall of the second chamber and the inner wall of the third chamber are respectively coated with a metal coating layer that is resistant to electromagnetic interference. A heat dissipating device comprising a heat sink and a gas flow generator, wherein the heat sink is provided with a plurality of air flow passages, wherein the air flow generator is the air flow according to any one of claims 1 to 7 The generator, the nozzle of the airflow generating unit of the airflow generator is disposed opposite to the radiator, and the airflow from the nozzle of the airflow generating unit flows into the airflow passage of the radiator. The heat sink of claim 8, wherein the outer end of the nozzle of the airflow generating unit is spaced apart from the inlet of the airflow passage. A heat dissipating device includes a heat sink, a first airflow generator, and a second airflow generator disposed opposite to the first airflow generator, wherein the heat sink is provided with a plurality of airflow passages, and the improvement is: An airflow generator according to any one of claims 1 to 7, wherein a nozzle of the airflow generating unit of the first airflow generator is disposed opposite to the heat sink, The nozzle of the airflow generating unit of the second airflow generator is disposed opposite to the heat sink.