A compressor body

Abstract

The present invention discloses a compressor body, which includes an air inlet and an exhaust port, and the body also includes a plurality of muffler cavities, which are arranged in the body, and the compressed air flow pulsation is attenuated through the plurality of muffler cavities. The present invention makes full use of the structural space of the compressor body to design the muffler cavity, thereby attenuating the compressed air flow pulsation, thereby effectively reducing the mechanical air flow noise.

Description

Technical Field

[0001] The present invention relates to compressor technology, and in particular to a compressor body structure. Background Art

[0002] In the traditional compressor structure, the air flow pulsation attenuation device is only designed locally, the structural space is not fully utilized, and the mechanical air flow noise is relatively large. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a compressor body that can effectively attenuate the pulsation of compressed air flow.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a compressor body, which includes an air inlet and an exhaust port, and is characterized in that the body also includes: multiple silencer chambers, which are arranged in the body, and the pulsation of compressed air flow is attenuated through the multiple silencer chambers.

[0005] In one embodiment of the present invention, the plurality of muffler chambers include: a first-order exhaust muffler chamber and a second-order exhaust muffler chamber, which are arranged on the exhaust bearing seat of the machine body and are respectively located on both sides of the exhaust chamber of the exhaust bearing seat.

[0006] In one embodiment of the present invention, the multiple silencer chambers also include: a third-order exhaust silencer chamber and a fourth-order exhaust silencer chamber, which are arranged on the exhaust bearing seat and located at one end of the exhaust chamber, and the third-order exhaust silencer chamber and the fourth-order exhaust silencer chamber are arranged between the first-order exhaust silencer chamber and the second-order exhaust silencer chamber.

[0007] In one embodiment of the present invention, the first-order exhaust silencer cavity and the second-order exhaust silencer cavity are rectangular cavities and define a first long axis direction, and the ratio of the length of the first-order exhaust silencer cavity and the second-order exhaust silencer cavity along the first long axis direction to the length of the exhaust bearing seat along the first long axis direction is 1:5 to 1:1.2 respectively.

[0008] In one embodiment of the present invention, at least two first connecting holes or at least two first conducting pipes are provided between the first-stage exhaust silencer chamber and the exhaust chamber, and at least two second connecting holes or at least two second conducting pipes are provided between the second-stage exhaust silencer chamber and the exhaust chamber.

[0009] In one embodiment of the present invention, the third-order exhaust silencer cavity and the fourth-order exhaust silencer cavity are rectangular cavities and define a second long axis direction, and the ratio of the length of the third-order exhaust silencer cavity and the fourth-order exhaust silencer cavity along the second long axis direction to the length of the exhaust cavity along the second long axis direction is 1:5 to 1:2 respectively.

[0010] In one embodiment of the present invention, at least one third connecting hole or at least one third conducting pipe is provided between the third-stage exhaust muffler chamber and the exhaust chamber, and at least one fourth connecting hole or at least one fourth conducting pipe is provided between the fourth-stage exhaust muffler chamber and the exhaust chamber.

[0011] In one embodiment of the present invention, a plurality of third through holes are formed on an end surface of the third-stage exhaust muffler cavity away from the exhaust cavity, and a plurality of fourth through holes are formed on an end surface of the fourth-stage exhaust muffler cavity away from the exhaust cavity.

[0012] In one embodiment of the present invention, an area of ​​each of the third through holes is smaller than an area of ​​each of the fourth through holes.

[0013] In one embodiment of the present invention, the total area of ​​the plurality of third through holes accounts for 10% to 40% of the area of ​​the end surface of the third-stage exhaust muffler cavity.

[0014] In one embodiment of the present invention, the total area of ​​the plurality of fourth through holes accounts for 30% to 70% of the area of ​​the end surface of the fourth-order exhaust muffler cavity.

[0015] In one embodiment of the present invention, on the orthographic projection surface of an end surface of the exhaust bearing seat away from the exhaust cavity, the total area of ​​the first-order exhaust silencer cavity, the second-order exhaust silencer cavity, the third-order exhaust silencer cavity and the fourth-order exhaust silencer cavity accounts for 20% to 50% of the area of ​​the end surface of the exhaust cavity.

[0016] In one embodiment of the present invention, the multiple silencer chambers include: a first-order body silencer chamber and a second-order body silencer chamber, which are arranged in parallel around the compression chamber of the body and located at one end of the exhaust chamber of the exhaust bearing seat of the body.

[0017] In one embodiment of the present invention, at least one first body communication hole or at least one first body conduction pipe is provided between the first-stage body silencer cavity and the exhaust cavity, and at least one second body communication hole or at least one second body conduction pipe is provided between the second-stage body silencer cavity and the exhaust cavity.

[0018] In one embodiment of the present invention, the multiple silencer chambers include: a first-order high-pressure silencer chamber and a second-order high-pressure silencer chamber, which are respectively arranged around the exhaust bearing seat, and the exhaust bearing seat has two rotor positioning holes. The first-order high-pressure silencer chamber and the second-order high-pressure silencer chamber are respectively located on both sides of the exhaust chamber and are respectively arranged corresponding to the two rotor positioning holes.

[0019] In one embodiment of the present invention, the first-order high-pressure muffler chamber and the second-order high-pressure muffler chamber each have at least one muffler hole, and the muffler hole is located away from the compression chamber of the body and is arranged on an end surface adjacent to the exhaust chamber.

[0020] In one embodiment of the present invention, the plurality of muffler cavities are double-wall cavities.

[0021] In one embodiment of the present invention, a tubular muffler is further provided at the inner edge of the air inlet and / or the exhaust port of the machine body, and the tubular muffler is a hollow structure.

[0022] In one embodiment of the present invention, the tubular silencer includes: an annular silencer chamber formed by concentrically surrounding an outer ring plate and an inner ring plate, wherein the inner ring plate has a plurality of perforations; a plurality of annular plates, arranged opposite to each other, the annular plates being connected to one end of the outer ring plate and the inner ring plate and closing one end of the annular silencer chamber; wherein the outer peripheral edge of the annular plate further extends outward and protrudes from the outer ring plate, and the annular plate forms a flange structure.

[0023] In one embodiment of the present invention, the tubular silencer comprises: a partition plate, which is arranged between the annular plates, and the two sides of the partition plate are respectively connected to the outer ring plate and the inner ring plate and divide the annular silencer chamber into two spaces.

[0024] The present invention designs the structure of the muffler cavity by making full use of the structural space of the compressor body, especially the exhaust bearing seat space, thereby effectively attenuating the pulsation of the compressed air flow, thereby effectively reducing the air flow noise of the machine.

[0025] The above description will be described in detail below with reference to implementation examples, and a further explanation will be provided for the technical solution of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the above and other objects, features, advantages and embodiments of the present invention more clearly understood, the accompanying drawings are described as follows:

[0027] Figure 1A A side view of a compressor body of the present invention;

[0028] Figure 1B For along Figure 1A Sectional view of midline AA;

[0029] Figure 2A A top view of a compressor body of the present invention;

[0030] Figure 2B For along Figure 2A Sectional view of midline BB;

[0031] Figure 3A A top view of a compressor body of the present invention;

[0032] Figure 3B For along Figure 3ASectional view of midline CC;

[0033] Figure 4A A top view of a compressor body of the present invention;

[0034] Figure 4B For along Figure 4A Sectional view of midline DD;

[0035] Figure 5A It is a schematic diagram of the three-dimensional structure of a preferred tubular muffler of the present invention;

[0036] Figure 5B It is a schematic diagram of the three-dimensional structure of another preferred tubular muffler of the present invention. DETAILED DESCRIPTION

[0037] In order to make the description of the present invention more detailed and complete, reference may be made to the attached drawings and various embodiments described below, in which the same numbers represent the same or similar components. On the other hand, well-known components and steps are not described in the embodiments to avoid unnecessary limitations on the present invention. In addition, in order to simplify the drawings, some known and commonly used structures and elements will be depicted in the drawings in a simple schematic manner.

[0038] like Figure 1A As shown, the compressor of the present invention may be, for example, a screw compressor, which has a body 100, wherein the body 100 includes an air inlet 101 and an air outlet 102, wherein the air inlet 102 is connected to a compression chamber 120 of the body 100, and the air outlet 102 is connected to an exhaust chamber 110 of the body 100. The body 100 also includes an exhaust bearing seat 10, a gear 30, and a rotor 40, etc. The rotor 40 is spiral, and may include, for example, a male screw 41 (or "male rotor") having convex teeth and a female screw 42 (or "female rotor") having tooth grooves (such as Figure 3B As shown in Figure 1B As shown, the body 100 of the present invention also includes a plurality of muffler cavities, which may include but are not limited to Figure 1B The muffler chambers 11, 12, 13, 14, 16, 17 shown in the figure, wherein the compressed air flow pulsation is attenuated via the multiple muffler chambers.

[0039] In the present invention, if Figure 1B as well as Figure 2A , Figure 2BAs shown, the multiple muffler chambers may include, for example, a first-order exhaust muffler chamber 11 and a second-order exhaust muffler chamber 12, which are arranged on the exhaust bearing seat 10 and are respectively located on both sides of the exhaust chamber 110 of the exhaust bearing seat 10, and are used to perform first-order and second-order attenuation of the compressed air flow pulsation during the exhaust process. In addition, at least two first connecting holes 111 (or at least two first conducting pipes) are provided between the first-order exhaust muffler chamber 11 and the exhaust chamber 110, and at least two second connecting holes 121 (or at least two second conducting pipes) are provided between the second-order exhaust muffler chamber 12 and the exhaust chamber 110. Among them, the compressed gas can enter the first-order exhaust silencer chamber 11 and the second-order exhaust silencer chamber 12 through the first connecting hole 111 (or the first connecting pipe) and the second connecting hole 121 (or the second connecting pipe), and then come out from the cavity through the first connecting hole 111 (or the first connecting pipe) and the second connecting hole 121 (or the second connecting pipe), and the noise energy is attenuated by the friction of the connecting hole or the connecting pipe.

[0040] In the present embodiment, the first-order exhaust muffler chamber 11 and the second-order exhaust muffler chamber 12 are located below the two rotors. Preferably, the first-order exhaust muffler chamber 11 and the second-order exhaust muffler chamber 12 may be rectangular cavities and define a first long axis direction L1, and the length of the first-order exhaust muffler chamber 11 along the first long axis direction L1 and the length of the exhaust bearing seat 10 along the first long axis direction L1 have a ratio of 1:5 to 1:1.2, and the length of the second-order exhaust muffler chamber 12 along the first long axis direction L1 and the length of the exhaust bearing seat 10 along the first long axis direction L1 have a ratio of 1:5 to 1:1.2. In the present invention, the longer the muffler chamber lengths of the first-order exhaust muffler chamber 11 and the second-order exhaust muffler chamber 12, the larger the chamber, and the better the effect.

[0041] Continue to refer Figure 1B as well as Figure 2A , Figure 2B As shown, the plurality of muffler chambers may also include a third-order exhaust muffler chamber 13 and a fourth-order exhaust muffler chamber 14, which are disposed on the exhaust bearing seat 10 and located at one end of the exhaust chamber 110, such as the rear end. Figure 1BAs shown, the third-order exhaust muffler chamber 13 and the fourth-order exhaust muffler chamber 14 are arranged between the first-order exhaust muffler chamber 11 and the second-order exhaust muffler chamber 12, and at least one third connecting hole 131 (or at least one third conducting pipe) is provided between the third-order exhaust muffler chamber 13 and the exhaust chamber 110, and at least one fourth connecting hole 141 (or at least one fourth conducting pipe) is provided between the fourth-order exhaust muffler chamber 14 and the exhaust chamber 110. The compressed gas can enter the cavity of the third-order exhaust muffler chamber 13 and the fourth-order exhaust muffler chamber 14 through the third connecting hole 131 (or the third conducting pipe) and the fourth connecting hole 141 (or the fourth conducting pipe), and then come out from the cavity through the third connecting hole 131 (or the third conducting pipe) and the fourth connecting hole 141 (or the fourth conducting pipe), and the noise energy is attenuated by the friction of the connecting hole or the conducting pipe. The third-order exhaust muffler chamber 13 and the fourth-order exhaust muffler chamber 14 can work together with the first-order exhaust muffler chamber 11 and the second-order exhaust muffler chamber 12 to perform first-order, second-order, third-order and fourth-order attenuation of compressed air flow pulsation during the exhaust process.

[0042] Preferably, the third-order exhaust silencer cavity 13 and the fourth-order exhaust silencer cavity 14 may be, for example, rectangular cavities and define a second long axis direction L2, and the ratio of the length of the third-order exhaust silencer cavity 13 and the fourth-order exhaust silencer cavity 14 along the second long axis direction L2 to the length of the exhaust cavity 110 along the second long axis direction L2 is 1:5 to 1:2 respectively.

[0043] like Figure 2B As shown, in this embodiment, a plurality of third through holes 132 may be provided on an end surface of the third-stage exhaust muffler chamber 13 away from the exhaust chamber 110, and a plurality of fourth through holes 142 may be provided on an end surface of the fourth-stage exhaust muffler chamber 14 away from the exhaust chamber 110. The third connecting hole 131 and the third through hole 132 are respectively provided on opposite sides of the third-stage exhaust muffler chamber 13, and the fourth connecting hole 141 and the fourth through hole 142 are respectively provided on opposite sides of the fourth-stage exhaust muffler chamber 14. Preferably, the area of ​​each of the third through holes 132 is smaller than the area of ​​each of the fourth through holes 142, that is, the aperture of each of the third through holes 132 is smaller than the aperture of each of the fourth through holes 142. More preferably, the total area of ​​the plurality of third through holes 132 accounts for 10% to 40% of the area of ​​the end surface of the third-stage exhaust muffler chamber 13. The total area of ​​the plurality of fourth through holes 142 accounts for 30% to 70% of the area of ​​the end surface of the fourth-order exhaust muffler chamber 14 .

[0044] Generally speaking, under the same conditions, the larger the volume of the silencer cavity, the lower the attenuation frequency; and the larger the aperture of the perforation on the silencer cavity, the higher the attenuation frequency. And, in general, a small aperture and a large cavity correspond to a relatively low frequency. If a large aperture corresponds to a large cavity, the attenuation frequency will deviate from the target frequency. In the present invention, since the third-order frequency is smaller than the fourth-order frequency, the cavity volume of the third-order exhaust silencer cavity 13 can be made larger by design, and the aperture of the third perforation 131 can be made smaller.

[0045] like Figure 2B As shown, in the present embodiment, on the orthographic projection surface of an end surface of the exhaust bearing seat 10 away from the exhaust cavity 110, the total area of ​​the first-order exhaust muffler cavity 11, the second-order exhaust muffler cavity 12, the third-order exhaust muffler cavity 13 and the fourth-order exhaust muffler cavity 14 accounts for 20% to 50% of the area of ​​the end surface of the exhaust cavity 110.

[0046] In the present invention, if Figure 3A , 3B As shown, and combined with reference Figure 1B The multiple muffler chambers may also include a first-stage body muffler chamber 16 and a second-stage body muffler chamber 17, which are arranged in parallel around the compression chamber 120 of the body 100 and located at one end of the exhaust chamber 110 of the exhaust bearing seat 10 of the body 100, for example, located at the front end of the exhaust chamber 110. In addition, at least one first body communication hole 161 (or at least one first body conduction pipe, such as Figure 1B As shown), at least one second body communication hole 171 (or at least one second body conduction pipe, such as Figure 1B It should be noted that Figure 1B Although the first body communicating hole 161 and the second body communicating hole 171 are shown at the same time, in fact, the first body communicating hole 161 and the second body communicating hole 171 are located on different cross sections (that is, the two should not appear on the same cross section in fact). Figure 1B The solid line shows the Figure 1A The second body communication hole 171 is actually visible in the cross section along the center line AA, and is shown in dotted lines along the Figure 1AThe first machine body connecting hole 161 is actually invisible in the cross section of the center line AA. The compressed gas can enter the first-order machine body muffler cavity 16 and the second-order machine body muffler cavity 17 through the first machine body connecting hole (or the first machine body conducting tube) and the second machine body connecting hole 171 (or the second machine body conducting tube), respectively, and then come out from the cavity through the first machine body connecting hole (or the first machine body conducting tube) and the second machine body connecting hole 171 (or the second machine body conducting tube), and the noise energy is attenuated by the friction of the connecting hole or the conducting tube. The first-order machine body muffler cavity 16 and the second-order machine body muffler cavity 17 can be used to perform first-order and second-order attenuation of compressed air flow pulsation.

[0047] In this embodiment, the first-stage body muffler cavity 16 is, for example, located correspondingly below the female screw 42 and has a relatively large space, and the second-stage body muffler cavity 17 is, for example, located correspondingly below the male screw 41, so the cavity volume of the first-stage body muffler cavity 16 is greater than the cavity volume of the second-stage body muffler cavity 17. In general, the cavity volumes of the first-stage body muffler cavity 16 and the second-stage body muffler cavity 17 can fill the available space of the compression chamber 120 as much as possible. However, it can be understood that, if the structure of the body 100 allows, it can also be set on the side or above the rotor, and these are not intended to limit the present invention.

[0048] like Figure 4A , Figure 4B As shown, in the present invention, the multiple muffler chambers may also include a first-order high-pressure muffler chamber 18 and a second-order high-pressure muffler chamber 19, which are respectively arranged around the exhaust bearing seat 10. Wherein, the exhaust bearing seat 10 has two rotor positioning holes 411, 421 for respectively corresponding to the fixed installation of the two rotors, namely the male screw 41 and the female screw 42. In addition, the first-order high-pressure muffler chamber 18 and the second-order high-pressure muffler chamber 19 are respectively located on both sides of the exhaust chamber 110 and are respectively arranged corresponding to the two rotor positioning holes 41, 421. Preferably, the first-order high-pressure muffler chamber 18 and the second-order high-pressure muffler chamber 19 may respectively have at least one muffler hole 181, 191, and the muffler hole is located away from the compression chamber 120 of the body 100 and is arranged adjacent to an end surface of the exhaust chamber 110. The first-order high-pressure muffler chamber 18 and the second-order high-pressure muffler chamber 19 can be used to attenuate the first-order and second-order pulsations of the compressed air flow during the compression process.

[0049] In the present invention, the multiple muffler cavities, such as muffler cavities 11, 12, 13, 14, 16, 17, 18, 19, can be double-walled cavities to form double-walled isolation for the compressed airflow. Preferably, these muffler cavities 11, 12, 13, 14, 16, 17, 18, 19 can be Helmholtz resonators. During the compression and exhaust processes, the compressed airflow pulsation can be attenuated through these muffler cavities 11, 12, 13, 14, 16, 17, 18, 19, thereby effectively reducing the mechanical airflow noise.

[0050] Return to reference Figure 1A , and combined with reference Figure 2A , Figure 5A and Figure 5B In the present invention, a tubular muffler 21 may be provided at the inner edge of the air inlet 101 of the machine body 100, and / or a tubular muffler 22 may be provided at the inner edge of the exhaust port 102 of the machine body 100. The tubular mufflers 21 and 22 may be, for example, hollow structures.

[0051] like Figure 5A As shown, combined with reference Figure 1A The tubular muffler 21 may include, for example, an annular muffler chamber 210 formed by concentrically surrounding an outer ring plate 212 and an inner ring plate 211, wherein the inner ring plate 211 has a plurality of through holes 2111, 2112. The tubular muffler 21 may also include a plurality of annular plates, for example, an annular plate 213 and an annular plate 214 disposed opposite to each other, wherein the annular plates 213, 214 are connected to one end of the outer ring plate 212 and the inner ring plate 211 and close one end of the annular muffler chamber 210, for example, the annular plate 213 may close the upper end of the annular muffler chamber 210, and the annular plate 214 may close the lower end of the annular muffler chamber 210.

[0052] In this embodiment, combined with reference Figure 1A and Figure 2A The outer periphery of the annular plate 213 may further extend outward and protrude from the outer annular plate 212 , so that the annular plate 213 may form a flange structure.

[0053] Preferably, if Figure 5AAs shown, the tubular muffler 21 may also include a partition plate 215, which may be disposed between the annular plate 213 and the annular plate 214, and the two sides of the partition plate 215 are respectively connected to the outer ring plate 212 and the inner ring plate 211, and the annular muffler chamber 210 is divided into two spaces, for example, a first space 210-1 located at the upper part and a second space 210-2 located at the lower part, and the inner ring plate 211 corresponding to the first space 210-1 has a plurality of perforations 2111, and the inner ring plate 211 corresponding to the second space 210-2 has a plurality of perforations 2112, so that a second-order muffler can be formed. More preferably, the ratio of the length H1 of the first space 210-1 to the length H2 of the second space 210-2 along the long axis direction of the tubular muffler 21 (i.e., H1:H2) is 1:1 to 2:1. However, it is understandable that, in other embodiments, the annular muffler chamber 210 may also be divided into three or more spaces to form a muffler with more muffler orders, which is not intended to limit the present invention.

[0054] like Figure 5B As shown, the tubular muffler 22 may include an annular muffler chamber 220 formed by concentrically surrounding an outer ring plate 222 and an inner ring plate 221, and the inner ring plate 221 has a plurality of perforations 2211. The tubular muffler 22 may also include a plurality of annular plates 223, for example, an annular plate 223 and an annular plate 224 arranged opposite to each other, these annular plates 223, 224 are connected to one end of the outer ring plate 222 and the inner ring plate 221 and close one end of the annular muffler chamber 220, for example, the annular plate 223 may close the upper end of the annular muffler chamber 220, and the annular plate 224 may close the lower end of the annular muffler chamber 220. Preferably, the outer periphery of the annular plate 223 may further extend outward and protrude from the outer ring plate 221, so that the annular plate 223 may form a flange structure.

[0055] In this embodiment, the structure of the tubular muffler 22 provided at the exhaust port 102 is different from that of the tubular muffler 21 provided at the air inlet 101, that is, it does not have a partition plate. However, it is understood that in other embodiments, the structure of the tubular muffler 22 provided at the exhaust port 102 may also adopt the same structure as that of the tubular muffler 21 provided at the air inlet 101, that is, adopting the structure of the tubular muffler 22 provided at the exhaust port 102. Figure 5A The structures shown are not intended to limit the present invention.

[0056] The present invention designs the structure of multiple silencer chambers by making full use of the structural space of the compressor body, especially the exhaust bearing seat space, which can form double-wall isolation for the compressed air flow and attenuate the pulsation of the compressed air flow, thereby effectively reducing the mechanical air flow noise.

[0057] Although the present invention has been disclosed as above in the form of an implementation method, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the attached claims.

Claims

1. A compressor body, comprising an air inlet and an air outlet, characterized in that: The body also includes: A plurality of muffler cavities are disposed in the body, and the pulsation of the compressed air flow is attenuated through the plurality of muffler cavities. The plurality of muffler chambers include: The first-order exhaust muffler cavity and the second-order exhaust muffler cavity are arranged on the exhaust bearing seat of the machine body and are respectively located on both sides of the exhaust cavity of the exhaust bearing seat, and The third-order exhaust muffler chamber and the fourth-order exhaust muffler chamber are arranged on the exhaust bearing seat and located at one end of the exhaust chamber, and the third-order exhaust muffler chamber and the fourth-order exhaust muffler chamber are arranged between the first-order exhaust muffler chamber and the second-order exhaust muffler chamber. The exhaust port is connected to the exhaust chamber, and the first-order exhaust muffler chamber, the second-order exhaust muffler chamber, the third-order exhaust muffler chamber and the fourth-order exhaust muffler chamber are all located below the rotor of the machine body and are arranged around the exhaust port; At least one third communication hole or at least one third conducting pipe is provided between the third-stage exhaust muffler cavity and the exhaust cavity, and at least one fourth communication hole or at least one fourth conducting pipe is provided between the fourth-stage exhaust muffler cavity and the exhaust cavity; A plurality of third through holes are formed on one end surface of the third-stage exhaust muffler cavity away from the exhaust cavity, and a plurality of fourth through holes are formed on one end surface of the fourth-stage exhaust muffler cavity away from the exhaust cavity; The plurality of third through holes and the at least one third connecting hole or the at least one third conducting tube are respectively opened on opposite sides of the third-stage exhaust silencer chamber; the plurality of fourth through holes and the at least one fourth connecting hole or the at least one fourth conducting tube are respectively opened on opposite sides of the fourth-stage exhaust silencer chamber.

2. The machine body according to claim 1, characterized in that: The first-order exhaust muffler cavity and the second-order exhaust muffler cavity are rectangular cavities and define a first long axis direction. The ratio of the length of the first-order exhaust muffler cavity and the second-order exhaust muffler cavity along the first long axis direction to the length of the exhaust bearing seat along the first long axis direction is 1:5~1:1.2 respectively.

3. The machine body according to claim 1, characterized in that: At least two first communication holes or at least two first conducting pipes are provided between the first-stage exhaust muffler chamber and the exhaust chamber, and at least two second communication holes or at least two second conducting pipes are provided between the second-stage exhaust muffler chamber and the exhaust chamber.

4. The machine body according to claim 1, characterized in that: The third-order exhaust silencer cavity and the fourth-order exhaust silencer cavity are rectangular cavities and define a second long axis direction. The ratio of the length of the third-order exhaust silencer cavity and the fourth-order exhaust silencer cavity along the second long axis direction to the length of the exhaust cavity along the second long axis direction is 1:5~1:2 respectively.

5. The machine body according to claim 1, characterized in that: The area of ​​each of the third through holes is smaller than the area of ​​each of the fourth through holes.

6. The machine body according to claim 1, characterized in that: The total area of ​​the plurality of third perforations accounts for 10% to 40% of the area of ​​the end surface of the third-stage exhaust muffler cavity.

7. The machine body according to claim 1, characterized in that: The total area of ​​the plurality of fourth through holes accounts for 30% to 70% of the area of ​​the end surface of the fourth-order exhaust muffler cavity.

8. The machine body according to claim 1, characterized in that: On the orthographic projection surface of an end surface of the exhaust bearing seat away from the exhaust cavity, the total area of ​​the first-order exhaust muffler cavity, the second-order exhaust muffler cavity, the third-order exhaust muffler cavity and the fourth-order exhaust muffler cavity accounts for 20% to 50% of the area of ​​the end surface of the exhaust cavity.

9. The machine body according to claim 1, characterized in that: The plurality of muffler chambers include: The first-stage body muffler cavity and the second-stage body muffler cavity are arranged in parallel around the compression cavity of the body and are located at one end of the exhaust cavity of the exhaust bearing seat of the body.

10. The machine body according to claim 9, characterized in that: At least one first body communication hole or at least one first body conduction pipe is provided between the first-stage body muffler cavity and the exhaust cavity, and at least one second body communication hole or at least one second body conduction pipe is provided between the second-stage body muffler cavity and the exhaust cavity.

11. The machine body according to claim 1, characterized in that: The plurality of muffler chambers include: The first-order high-pressure muffler chamber and the second-order high-pressure muffler chamber are respectively arranged around the exhaust bearing seat. The exhaust bearing seat has two rotor positioning holes. The first-order high-pressure muffler chamber and the second-order high-pressure muffler chamber are respectively located on both sides of the exhaust chamber and are respectively arranged corresponding to the two rotor positioning holes.

12. The machine body according to claim 11, characterized in that: The first-order high-pressure muffler chamber and the second-order high-pressure muffler chamber each have at least one muffler hole, and the muffler hole is located at an end surface away from the compression chamber of the body and adjacent to the exhaust chamber.

13. The machine body according to claim 1, characterized in that: The multiple muffler cavities are double-wall cavities.

14. The machine body according to claim 1, characterized in that: A tubular muffler is also provided at the inner edge of the air inlet and / or the exhaust port of the machine body, and the tubular muffler is a hollow structure.

15. The machine body according to claim 14, characterized in that: The tubular muffler comprises: An annular muffler cavity is formed by concentrically surrounding an outer ring plate and an inner ring plate, wherein the inner ring plate has a plurality of through holes; A plurality of annular plates are arranged opposite to each other, wherein the annular plates are connected to one end of the outer annular plate and the inner annular plate and close one end of the annular muffler chamber; Wherein, the outer peripheral edge of the annular plate further extends outward and protrudes from the outer annular plate, and the annular plate forms a flange structure.

16. The machine body according to claim 15, characterized in that The tubular muffler comprises: A partition plate is arranged between the annular plates, and two sides of the partition plate are respectively connected to the outer annular plate and the inner annular plate and divide the annular muffler cavity into two spaces.

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