Silencer and gas compression equipment

Abstract

The utility model discloses a silencer and gas compression equipment. The silencer comprises a first barrel and a first silencing unit. The first barrel comprises a first barrel inlet and a first barrel outlet. The first silencing unit is located in the first barrel and comprises a silencing piece. The silencing part comprises a plurality of silencing cavities, and each silencing cavity penetrates through the silencing part in the axial direction of the first barrel and communicates with the first barrel inlet and the first barrel outlet, so that airflow enters the silencing cavities from the first barrel inlet and then flows out of the first barrel outlet. Therefore, the silencing cavities are small cavities relative to the cavity between the silencing piece and the inlet of the first barrel body and are independent from one another, high-frequency noise is weakened due to mutual interference in the small cavities, and therefore the silencing effect on the high-frequency noise is good.

Description

TECHNICAL FIELD

[0001] The present application relates to a muffler, in particular to a muffler and a gas compression device. BACKGROUND

[0002] In order to meet the needs of various industries, in recent years, a series of air compressors (such as low-pressure air compressors) and blower products have been continuously launched, but the noise problem seriously affects the industrial application experience, and a corresponding muffler needs to be designed to achieve good high-frequency noise reduction effect. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to disclose a muffler and a gas compression device. The muffler can effectively reduce high-frequency noise.

[0004] In a first aspect, the present application discloses a muffler. The muffler comprises a first cylinder and a first muffling unit. The first cylinder comprises a first cylinder inlet and a first cylinder outlet. The first muffling unit is located in the first cylinder and comprises a muffling piece. The muffling piece comprises a plurality of muffling cavities, each of which penetrates the muffling piece along the axial direction of the first cylinder and is in communication with the first cylinder inlet and the first cylinder outlet, so that the gas flow enters each muffling cavity from the first cylinder inlet and flows out from the first cylinder outlet.

[0005] In some embodiments, the first cylinder inlet, the first muffling unit and the first cylinder outlet are in communication along the axial direction of the first cylinder, so that the gas enters along the axial direction of the first cylinder and is discharged from the first cylinder outlet along the axial direction of the first cylinder.

[0006] In some embodiments, along the flow direction of the gas flow, the muffling piece comprises a muffling piece front plate, a muffling piece rear plate and a plurality of muffling cylinders; the muffling piece front plate comprises a plurality of front plate through holes; the muffling piece rear plate comprises a plurality of rear plate through holes, and the muffling cylinder comprises a cylinder cavity; the front plate through hole, the cylinder cavity and the rear plate through hole are in one-to-one correspondence and in sequence communication to form the muffling cavity; the cylinder cavity is enlarged relative to the front plate through hole; the rear plate through hole is reduced relative to the cylinder cavity;

[0007] In some embodiments, the muffling cavity is in a cylindrical shape.

[0008] In some embodiments, the first muffler unit comprises an inlet baffle integrated with or assembled to the first cylinder body; the first cylinder body inlet, the inlet baffle and the muffling element are sequentially and spacedly arranged along the axial direction of the first cylinder body to form a first cavity between the inlet baffle and the first cylinder body inlet and a second cavity between the inlet baffle and the muffling element; the inlet baffle comprises an inlet baffle through hole which communicates the first cavity and the second cavity along the axial direction of the first cylinder body.

[0009] In some embodiments, the first muffler unit comprises an outlet baffle integrated with or assembled to the first cylinder body; the muffling element, the outlet baffle and the first cylinder body outlet are sequentially and spacedly arranged along the axial direction of the first cylinder body to form a third cavity between the muffling element and the outlet baffle and a fourth cavity between the outlet baffle and the first cylinder body outlet; the outlet baffle comprises an outlet baffle through hole which communicates the third cavity and the fourth cavity along the axial direction of the first cylinder body.

[0010] In some embodiments, the first cylinder body comprises a cylinder body front end provided with the first cylinder body inlet; the muffler comprises a check valve which is directly connected to the first cylinder body front end.

[0011] In some embodiments, the check valve comprises a check valve core and a check valve body; the check valve core is extracted from or inserted into the check valve body.

[0012] In some embodiments, the muffler comprises a second cylinder body and a second muffler unit located in the second cylinder body; the second cylinder body is linearly connected to the first cylinder body; the gas flow passes from the first muffler unit to the second muffler unit through the first cylinder body outlet; the frequency range of the sound wave attenuated by the first muffler unit overlaps the frequency range of the sound wave attenuated by the second muffler unit.

[0013] In some embodiments, the second muffler unit comprises a muffling element; the number of the sound wave attenuation cavities of the muffling element of the second muffler unit is not equal to the number of the sound wave attenuation cavities of the muffling element of the first muffler unit.

[0014] In some embodiments, the second muffler unit comprises a spigot which is inserted into the second cylinder body; the spigot is communicated with the first cylinder body outlet of the first muffler unit and is sequentially and spacedly arranged with the muffling element of the second muffler unit along the axial direction of the second cylinder body to form a fifth cavity between the spigot and the second muffler unit.

[0015] In some embodiments, the sum of the number of the muffling element of the first muffler unit and the muffling element of the second muffler unit is less than or equal to 3.

[0016] In some embodiments, the second cylinder body comprises a cylinder body proper and an air inlet pipe; the air inlet pipe protrudes from the cylinder body proper, and the outer wall of the air inlet pipe is provided with a plurality of reinforcing ribs, all of which are distributed along the circumference of the cylinder body proper; when the first cylinder body and the second cylinder body are assembled, all of the reinforcing ribs are located between the first cylinder body and the cylinder body proper.

[0017] In some embodiments, the second cylinder body is assembled with the second muffler unit, and the second cylinder body is assembled with the first cylinder body, or the second cylinder body is integrally formed with the first cylinder body, and the second muffler unit is located in the second cylinder body.

[0018] In a second aspect, the present application discloses a gas compression device. The gas compression device comprises any of the foregoing mufflers, and the gas compression device comprises an air compressor or a blower.

[0019] For the muffler and the gas compression device, since the first muffler unit is provided with the muffling member comprising a plurality of muffling cavities, each of the muffling cavities is a small cavity relative to the cavity between the muffling member and the inlet of the first cylinder body, and is independent of each other, and high-frequency noise is weakened by mutual interference in the small cavities, thus, the above-mentioned arrangement has a good effect on muffling high-frequency noise. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is an exploded view of a muffler of the present application;

[0021] Figure 2 is a partial view of a muffler of the present application, with a cylinder body being partially cut away to show the internal structure;

[0022] Figure 3 is a partial schematic view of a muffling member of the present application, to highlight a muffling cavity. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments (or “embodiments”) of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated.

[0024] If the application embodiments involve the terms of direction indication or position relationship (for example, up, down, left, right, front, back, inner, outer, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative position relationship, motion condition, etc. between components in a certain posture (as shown in the drawings); if the certain posture changes, the direction indication or position relationship also changes accordingly. In addition, the terms "first", "second", etc. in the application embodiments are only used for convenience of description, and cannot be understood as indicating or implying relative importance.

[0025] Referring to Figure 1 and Figure 2 , the application discloses a muffler. The muffler comprises a first cylinder 1 and a first muffling unit 2. Although Figure 1 and Figure 2 also show a second muffling unit 3, the skilled person can understand that the muffler can only have the first muffling unit 2. The first muffling unit 2 comprises a muffling piece 21. In some embodiments, the first muffling unit 2 can only comprise the muffling piece 21. The muffling piece 21 comprises a plurality of muffling cavities 211. The muffling cavities 211 are shown as four in the first muffling unit 2 in Figure 1 and Figure 3 , and five in the muffling piece (second muffling piece 31) of the second muffling unit 3. Therefore, it can be inferred that the number of muffling cavities 211 is not limited. Each muffling cavity 211 penetrates the muffling piece 21 along the axial direction of the first cylinder 1 and communicates with the first cylinder inlet 11 and the first cylinder outlet 12.

[0026] The first cylinder 1 comprises a first cylinder inlet 11 and a first cylinder outlet 12. The first muffling unit 2 is located in the first cylinder 1, so that the first cylinder inlet 11, the muffling cavities 211 of the muffling piece 21 of the first muffling unit 2 and the first cylinder outlet 12 communicate along the axial direction of the first cylinder 1, so that the gas enters the muffler from the first cylinder inlet 11, passes through the first muffling unit 2 and is discharged from the first cylinder outlet 12. However, in some embodiments, the first cylinder inlet 11, the muffling cavities 211 and the first cylinder outlet 12 can not communicate in the axial direction, that is, for the muffler, the gas flow can not be along the axial direction.

[0027] As set forth above, since the first muffling unit 2 is provided with the muffling member 21, which comprises a plurality of muffling cavities 211, each of the muffling cavities 211 is small in size relative to the cavity between the first muffling unit 2 and the first cylinder inlet 11 (in the embodiment described later, relative to the first cavity 221), and independent from each other, and the high frequency noise is weakened by interference in the small cavities, thus the above-mentioned arrangement has a good effect on muffling high frequency noise.

[0028] In addition, since the first cylinder inlet 11, each of the muffling cavities 211 and the first cylinder outlet 12 are communicated along the direction of the first cylinder 1, the flow of the gas is easier to move along the axial direction of the cylinder 1 than in the radial direction to the cylinder wall of the first cylinder, thus, under the premise of meeting the aforementioned good effect on muffling high frequency noise, it is also beneficial to reduce the impact of the flow on the cylinder wall and to avoid aerodynamic regenerative noise (for example, the first cylinder 1 is not excited to avoid aerodynamic regenerative noise).

[0029] Referring to Figure 3 , along the flow direction of the flow, the muffling member 21 comprises a muffling member front plate 212, a muffling member rear plate 213 and a plurality of muffling cylinders 214. The muffling member front plate 212 comprises a plurality of front plate through holes 2121. The muffling member rear plate 213 comprises a plurality of rear plate through holes 2131. The muffling cylinder 214 comprises a cylinder cavity 2141.

[0030] The front plate through hole 2121, the cylinder cavity 2141 and the rear plate through hole 2131 correspond to each other and are sequentially communicated to form the muffling cavity 211. The cylinder cavity 2141 is enlarged relative to the front plate through hole 2121; the rear plate through hole 2131 is reduced relative to the cylinder cavity 2141.

[0031] As set forth above, since the cylinder cavity 2141 is enlarged relative to the front plate through hole 2121; the rear plate through hole 2131 is reduced relative to the cylinder cavity 2141, thus, the flow of the gas from the front plate through hole 2121 into the cylinder cavity 2141 will pass through the expansion effect, and then be discharged through the rear plate through hole 2131, which has a good effect on muffling high frequency sound waves, and further, the flow of the gas propagates inside the muffling cavity 211 instead of propagating to the cylinder wall of the first cylinder 1, reducing the impact on the cylinder wall of the first cylinder 1 and avoiding aerodynamic regenerative noise, and also achieving good muffling effect.

[0032] In some other embodiments, the sound absorbing cavity 211 is cylindrical. That is, the sound absorbing cavity 211 has no expansion effect relative to the sound absorbing cavity formed by the aforementioned front plate through hole 2121, the cylinder cavity 2141 and the rear plate through hole 2131, and the sound absorbing effect is relatively poor. However, since the sound wave also propagates in the sound absorbing cavity 211 and does not propagate to the cylinder wall of the first cylinder 1, the impact on the cylinder wall of the first cylinder 1 is reduced, which is conducive to reducing the aerodynamic regeneration noise.

[0033] Continuing to refer to Figure 1 and Figure 2 , the first sound absorbing unit 2 includes an inlet baffle 22 which is integrally formed with or assembled with the first cylinder 1. After being integrally formed, the position of the inlet baffle 22 in the first cylinder 1 is not adjustable, such as the position between the inlet baffle 22 and the sound absorbing member 21, and the like, which is not convenient for adjusting the frequency in order to adapt to the sound absorption of sound waves of other frequencies. The assembly includes fixed assembly, that is, after the position is set according to the frequency of the sound wave to be absorbed (such as the distance between the inlet baffle 22 and the sound absorbing member 21), the assembly is installed and cannot be adjusted, so it cannot adapt to the sound absorption of sound waves of other frequencies; but the advantage is that at the beginning of the design, the adjustment can be realized according to the frequency of the sound wave to be absorbed; another assembly is movable assembly; in the first position, the sound absorption of sound waves of the first frequency is realized; by adjusting from the first position to the second position, the sound absorption of sound waves of the second frequency is realized. The cylinder inlet 11, the inlet baffle 22 and the sound absorbing member 21 are sequentially and spaced apart along the axial direction of the first cylinder 1, so as to form a first cavity 221 (as shown in Figure 2 between the inlet baffle 22 and the sound absorbing member 21. The inlet baffle 22 includes an inlet baffle through hole 223 which communicates the first cavity 221 and the second cavity 222 along the axial direction of the first cylinder 1.

[0034] Based on the above arrangement, the airflow enters the first cavity 221, is absorbed by the expansion effect, and then enters the second cavity 222 through the inlet baffle through hole 223 to pass through the expansion effect. At this time, the airflow is divided into multiple paths and enters the sound absorbing cavity 211 one by one to be absorbed. Therefore, by adding the first cavity 221 and the second cavity 222 formed by the inlet baffle 22, the sound absorption of low-frequency sound waves is realized, and the sound absorption effect is good. In addition, by adding the inlet baffle 22, it is conducive to improving the static transmission loss (the higher the static transmission loss, the better). Further, by adding the inlet baffle 22, the inlet baffle through hole 223 communicates the first cavity and the second cavity along the axial direction of the first cylinder, so that the airflow moves along the axial direction and is not easy to produce aerodynamic regeneration noise.

[0035] Referring to Figure 1 and Figure 2The first muffler unit 2 comprises an outlet partition plate 23 integrally formed or assembled with the first cylinder body 1, the muffling part 21, the outlet partition plate 23 and the first cylinder body outlet 12 are sequentially and spacedly arranged along the axial direction of the first cylinder body 1 to form a third cavity 233 between the muffling part 21 and the outlet partition plate 23 and a fourth cavity 234 between the outlet partition plate 23 and the first cylinder body outlet 12. The outlet partition plate 23 comprises an outlet partition plate through hole 231 which communicates the third cavity 233 and the fourth cavity 234 along the axial direction of the first cylinder body 1.

[0036] According to the above arrangement, by additionally arranging the outlet partition plate 23 and in combination with the plurality of muffling cavities 211, the gas from the muffling cavities 211 enters the third cavity 233 and is muffled by the expansion effect, thereby achieving the muffling of low frequency. Correspondingly, by additionally arranging the outlet partition plate 23, the static transmission loss (the higher the static transmission loss, the better) can also be improved. Further, the inlet partition plate through hole 223 communicates the third cavity 233 and the fourth cavity 234 along the axial direction of the first cylinder body, so that the gas flow moves along the axial direction, which is also beneficial to avoid the aerodynamic regenerative noise.

[0037] Referring to Figure 1 and Figure 2 The first cylinder body 1 comprises a cylinder body front end provided with the first cylinder body inlet 11, and the muffler comprises a check valve 4. The check valve 4 is directly connected with the first cylinder body front end. How to directly connect is not limited, for example, as shown in Figure 1 and Figure 2 the connection is realized by a connecting flange 43.

[0038] By directly connecting the check valve 4 with the first cylinder body front end, no additional pipeline connection is needed, the connection is simple, and the cost is low.

[0039] Referring to Figure 1 The check valve 4 comprises a check valve core 41 and a check valve body 42; the check valve core 41 is extracted from or inserted into the check valve body 42. Figure 2 The state after the check valve core 41 is inserted into the check valve body 42 is shown.

[0040] According to the above arrangement, the check valve core 41 is extracted from or inserted into the check valve body 42, which is convenient for assembling the check valve 4.

[0041] Referring to Figure 1, the muffler comprises a second cylinder 5 and a second muffling unit 3 located in the second cylinder 5. The second cylinder 5 is linearly connected with the first cylinder 1; the airflow flows from the first muffling unit 2 to the second muffling unit 3 through the first cylinder outlet 12. The frequency range of the first muffling unit 2 and the frequency range of the second muffling unit 3 overlap, so that the frequency of the muffler is the superposition of the frequency of the first muffling unit 2 and the frequency of the second muffling unit. For example, the frequency range of the first muffling unit 2 is 1000Hz-2000Hz, the frequency range of the second muffling unit 3 is 1500Hz-2500Hz, and the frequency of the muffler is 1000Hz-2500Hz. For another example, the frequency range of the first muffling unit 2 is 1000Hz-2000Hz, the frequency range of the second muffling unit 3 is 200Hz-3000Hz, and the frequency of the muffler is 1000Hz-3000Hz. In the case of the muffler comprising the components shown in Figure 1 and Figure 2 , the effective muffling range can cover 500Hz-3000Hz.

[0042] As described above, by arranging the second muffling unit 3, the frequency range of the muffler is the superposition of the frequency range of the first muffling unit 2 and the frequency range of the second muffling unit 3, and the muffling range is expanded. In addition, the second cylinder is linearly connected with the first cylinder, which is also conducive to the axial propagation of the airflow and is not easy to produce aerodynamic regeneration noise.

[0043] Referring to Figure 1 and Figure 2 , the second muffling unit 3 comprises a muffling piece 21, and the number of the muffling cavities 211 of the muffling piece of the second muffling unit 3 is not equal to the number of the muffling cavities 211 of the muffling piece (marked as the second muffling piece 31 for distinguishing from the muffling piece 21 of the first muffling unit) of the first muffling unit 2, that is, the difference between the muffling piece 21 of the first muffling unit 2 and the muffling piece (the second muffling piece 31) of the second muffling unit 3. As shown in Figure 1 , the first muffling unit 2 has four muffling cavities 211. The second muffling unit 3 has five muffling cavities 211. At this time, the frequency range of the first muffling unit and the frequency range of the second muffling unit overlap, which includes the frequency range of the muffling of the muffling piece 21 of the first muffling unit 2 and the frequency range of the muffling of the second muffling unit 3.

[0044] As described above, the first muffling unit 2 and the second muffling unit 3 can both achieve high-frequency muffling, but the number of the muffling cavities 211 of the first muffling unit 2 and the number of the muffling cavities 211 of the second muffling unit 3 are not equal, and the frequency range of the muffling is different, so that the effective muffling range of the high-frequency muffling of the muffler is wider.

[0045] Referring to Figure 1 and Figure 2 , the second muffler unit 3 comprises a plug pipe 32. The plug pipe 32 is inserted into the second cylinder body 5 and communicates with the first cylinder body outlet 12 of the first muffler unit 2, and is axially spaced apart from the muffling member (second muffling member 31) of the second muffler unit 3 along the second cylinder body 5 to form a fifth cavity 33 between the plug pipe 32 and the muffling member of the second muffler unit 3. Thus, referring to Figure 2 , the airflow flowing out of the first cylinder body outlet 12 of the first muffler unit 2 enters the fifth cavity 33 through the plug pipe 32.

[0046] As described above, by providing the plug pipe 32, the noise of the medium frequency can be muffled, and at the same time, the plug pipe is additionally provided, which can also increase the static transmission loss (the higher the static transmission loss, the better). Further, the plug pipe 32 is additionally provided, which is also axially through, so that the airflow moves axially.

[0047] Referring to Figure 1 and Figure 2 , the number of the muffling member 21 of the first muffler unit 2 and the muffling member (second muffling member 31) of the second muffler unit 3 is less than or equal to 3. In the present application, the number is 2.

[0048] As described above, by the number being less than or equal to 3, the static transmission loss and the aerodynamic regenerative noise can be balanced. Increasing the parts can increase the static transmission loss, and correspondingly increase the aerodynamic regenerative noise. The higher the static transmission loss, the better, but the larger the aerodynamic regenerative noise, the worse, so a balance between the two is required. For the structure of the muffler of the present application, although the inlet partition plate 22, the outlet partition plate 23 and the plug pipe 32 are increased, they have less effect on the increase of the aerodynamic regenerative noise, because they can make the airflow move axially. The muffling member 21 of the first muffler unit 2 and the muffling member (second muffling member 31) of the second muffler unit 3 are for muffling high-frequency noise, which can withstand greater impact and is prone to produce aerodynamic regenerative noise. Therefore, the number of the muffling member 21 of the first muffler unit 2 and the muffling member of the second muffler unit 3 can be controlled.

[0049] Referring to Figure 1 and Figure 2 , the second cylinder body 5 comprises a cylinder body 51 and an air inlet pipe 52. The air inlet pipe 52 protrudes from the cylinder body 51. The outer wall of the air inlet pipe 51 is provided with a plurality of reinforcing ribs 53. All the reinforcing ribs 53 are distributed along the circumference of the cylinder body 51. Referring to Figure 2In the case of assembling the first cylinder body 1 and the second cylinder body 5, all the reinforcing ribs 53 are located between the first cylinder body 1 and the cylinder body 52. The assembling can be integrally formed or realized by parts. For example, the assembling is realized by components such as stage flange 54. In the case of the air inlet pipe 52, the cannula 32 is inserted into the air inlet pipe 52.

[0050] As described above, by locating all the reinforcing ribs 53 between the first cylinder body 1 and the cylinder body 51, the reinforcing ribs 53 can improve the rigidity of the connection between the first cylinder body 1 and the second cylinder body 5, improve the modal frequency, and thus reduce the structural radiation noise.

[0051] In the embodiments of the present application, the second cylinder body 5 is assembled with the second muffler unit 3, and the second cylinder body 5 is assembled with the first cylinder body 1. After the assembling, the second cylinder body 5 is connected with the outlet flange 55 relative to the end of the first cylinder body 1.

[0052] As described above, since the second cylinder body 5 is assembled with the second muffler unit 3, and the second cylinder body 5 is assembled with the first cylinder body 1, the first cylinder body 1 and the first muffler unit 2 constitute a first-stage muffling module, and the second cylinder body 5 and the second muffler unit 3 constitute another-stage muffling module. If the noise requirement on site is low, one of the muffling modules can be directly removed, and the flexibility is high.

[0053] In some embodiments, the second cylinder body 5 is integrally formed with the first cylinder body 1, and at this time, the second muffler unit 3 is also located in the second cylinder body 5.

[0054] In a second aspect, the present application discloses a gas compression device. The gas compression device comprises any one of the mufflers described above, and the gas compression device comprises an air compressor or a blower.

[0055] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of the present application is not limited to the precise structures described in the above embodiments and shown in the drawings; any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A muffler characterized by comprising: The muffler comprises a first cylinder and a first muffling unit, wherein: The first cylinder comprises a first cylinder inlet and a first cylinder outlet; The first muffling unit is located in the first cylinder and comprises a muffling piece; the muffling piece comprises a plurality of muffling cavities, each of which penetrates through the muffling piece along the axial direction of the first cylinder; each of the muffling cavities is in communication with the first cylinder inlet and the first cylinder outlet, so that the gas flow enters each muffling cavity from the first cylinder inlet and flows out from the first cylinder outlet.

2. The muffler of claim 1, wherein The first cylinder inlet, the first muffling unit and the first cylinder outlet are in communication along the axial direction of the first cylinder, so that the gas enters along the axial direction of the first cylinder and is discharged from the first cylinder outlet along the axial direction of the first cylinder.

3. The muffler of claim 1, wherein In the flow direction of the gas flow, the muffling piece comprises a muffling piece front plate, a muffling piece rear plate and a plurality of muffling cylinders; the muffling piece front plate comprises a plurality of front plate through holes; the muffling piece rear plate comprises a plurality of rear plate through holes, and the muffling cylinder comprises a cylinder cavity; The front plate through hole, the cylinder cavity and the rear plate through hole are in one-to-one correspondence and in sequential communication to form the muffling cavity; the cylinder cavity is enlarged relative to the front plate through hole; the rear plate through hole is reduced relative to the cylinder cavity; Alternatively, the muffling cavity is in a cylindrical shape.

4. The muffler of claim 1, wherein The first muffling unit comprises an inlet partition plate integrally formed or assembled with the first cylinder; the first cylinder inlet, the inlet partition plate and the muffling piece are sequentially and spaced apart along the axial direction of the first cylinder to form a first cavity between the inlet partition plate and the first cylinder inlet and a second cavity between the inlet partition plate and the muffling piece; The inlet partition plate comprises an inlet partition plate through hole, which communicates the first cavity and the second cavity along the axial direction of the first cylinder.

5. The muffler of claim 1 or 4, wherein The first muffling unit comprises an outlet partition plate integrally formed or assembled with the first cylinder; the muffling piece, the outlet partition plate and the first cylinder outlet are sequentially and spaced apart along the axial direction of the first cylinder to form a third cavity between the muffling piece and the outlet partition plate and a fourth cavity between the outlet partition plate and the first cylinder outlet; The outlet partition plate comprises an outlet partition plate through hole, which communicates the third cavity and the fourth cavity along the axial direction of the first cylinder.

6. The muffler of claim 1, wherein The first cylinder comprises a cylinder front end provided with the first cylinder inlet, and the muffler comprises a check valve directly connected with the first cylinder front end.

7. The muffler of claim 6 wherein, The check valve comprises a check valve core and a check valve body; the check valve core is extracted from or inserted into the check valve body.

8. The muffler of claim 1, wherein The muffler comprises a second cylinder and a second muffling unit located in the second cylinder; the second cylinder is linearly connected with the first cylinder; the gas flow flows from the first muffling unit to the second muffling unit through the first cylinder outlet; the frequency range of the sound eliminated by the first muffling unit and the frequency range of the sound eliminated by the second muffling unit overlap.

9. The muffler of claim 8, wherein The second muffler unit comprises a muffling member, and the number of muffling cavities of the muffling member of the second muffler unit is not equal to the number of muffling cavities of the muffling member of the first muffler unit.

10. The muffler of claim 8, wherein The second muffler unit comprises a spigot, which is inserted into the second cylinder body; the spigot is communicated with the first cylinder body outlet of the first muffler unit, and is arranged along the axial direction of the second cylinder body and spaced from the muffling member of the second muffler unit, so as to form a fifth cavity between the spigot and the second muffler unit.

11. The muffler of claim 8, wherein The sum of the number of the muffling member of the first muffler unit and the number of the muffling member of the second muffler unit is less than or equal to 3.

12. The muffler of claim 8, wherein The second cylinder body comprises a cylinder body proper and an air inlet pipe; the air inlet pipe protrudes from the cylinder body proper, and the outer wall of the air inlet pipe is provided with a plurality of reinforcing ribs, all of which are distributed along the circumferential direction of the cylinder body proper. When the first cylinder body and the second cylinder body are assembled, all of the reinforcing ribs are located between the first cylinder body and the cylinder body proper.

13. The muffler of claim 8, wherein The second cylinder body is assembled with the second muffler unit, and the second cylinder body is assembled with the first cylinder body, or the second cylinder body is integrally formed with the first cylinder body, and the second muffler unit is located in the second cylinder body.

14. A gas compression apparatus, characterized by The gas compression device comprises the muffler according to any one of claims 1 to 13, and the gas compression device comprises an air compressor or a blower.

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