Silencer and refrigerating system adopting same

Abstract

The utility model discloses a silencer and a refrigerating system adopting the same. The silencer is characterized by comprising a sleeve, a plurality of annular partition plates and an annular shell arranged in a stepped cylinder shape or a circular truncated cone cylinder shape. Axially-separated silencing cavities are defined by the sleeve, the adjacent annular partition plates and the shell, and the volumes of all the silencing cavities are different. A plurality of through holes are formed in the portions, between the annular partition plates, of the silencing cavity area of the sleeve body, and the through holes are communicated with the silencing cavities in the circumferential direction. The broadband muffler can meet the broadband muffling requirement, and is simple in structure and beneficial to processing, manufacturing and assembling.

Description

Technical Field

[0001] This application relates to the technical field of noise reduction in refrigeration and HVAC, and particularly to a muffler and a refrigeration system involved in equipment such as refrigeration units, household appliances, and automobiles. Background Art

[0002] Compared with fixed-frequency units, the speed operating range of variable-frequency units is relatively wide, and the corresponding noise frequency bands are also relatively wide. Taking a single-screw compressor as an example, its noise mainly comes from exhaust pulsation noise. For a screw rotor with 6 tooth grooves, when the operating frequency is 50 Hz, the first-order and second-order frequencies of its exhaust pulsation are 300 Hz and 600 Hz respectively; when the operating frequency is 60 Hz, the first-order and second-order frequencies of its exhaust pulsation are 360 Hz and 720 Hz respectively; when the operating frequency is 70 Hz, the first-order and second-order frequencies of its exhaust pulsation are 420 Hz and 840 Hz respectively. That is to say, for a unit with an operating range from 50 to 70 Hz, the first-order pulsation excitation frequency range is 300 to 420 Hz, and the second-order pulsation excitation frequency is 600 to 840 Hz, and the noise coverage frequency band is relatively wide. Correspondingly, higher requirements are put forward for the noise reduction frequency band range of the muffler. The noise reduction frequency of the muffler needs to cover the above-mentioned multiple noise frequency bands to obtain a better noise reduction effect.

[0003] The existing mufflers have a good noise reduction effect on eliminating a single noise peak, but have a poor noise reduction effect on multiple noise peaks and / or wide-band peaks. How to design a muffler to achieve a wider noise reduction frequency band, so as to solve the problem of wide-band noise reduction has become an urgent technical problem to be solved.

[0004] In some equipment with turbochargers, a plurality of muffler chambers are arranged in series along the length direction of a double-layer pipe body according to a preset, and the inner pipe body is provided with muffler holes. Each chamber after being connected in series can reduce the pressure pulsation in a frequency band, so as to cover a certain speed range of the supercharger to achieve a noise reduction effect. In this technology, the volume of each series-connected chamber is the same, so the corresponding noise reduction frequencies are also the same, and it is impossible to achieve noise reduction for different frequencies; at the same time, the holes on the inner pipe body are too dense, the processing and manufacturing difficulty is relatively large, and the cost is high; in addition, when the chamber partition ratio is different, it is not easy to distinguish the inlet end and the outlet end in appearance, and it is very easy to cause the assembly to be reversed during the assembly process, affecting the sound insulation effect.

[0005] In some household appliances with vibrations such as washing machines, sound-absorbing holes are asymmetrically arranged at different intervals in the circumferential and axial directions of the pipe body through partitions, and different sound-absorbing cavities form different central sound-absorbing frequencies. Due to the different central frequencies of multiple sound-absorbing cavities, the sound-absorbing component has a wider sound-absorbing frequency range and can achieve a sound-absorbing effect within this range, meeting the wide-band sound-absorbing requirements to satisfy the sound-absorbing needs in various situations. However, this kind of sound-absorbing structure is an asymmetric structure, which is difficult to produce and process; in addition, this kind of sound absorption also depends on different shape combinations, including both round holes and square holes (square windows), with a complex structure and being not conducive to processing and manufacturing. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a muffler and a device using the same, especially a refrigeration system, which can meet the wide-band sound-absorbing requirements, and at the same time, has a simple structure and is conducive to processing, manufacturing and assembly.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A muffler, characterized by comprising: a sleeve, a plurality of annular partitions, and an annular outer shell arranged in a stepped cylindrical shape or a frustum-shaped cylindrical shape; the sleeve, adjacent annular partitions and the outer shell enclose to form axially separated sound-absorbing cavities, and the volumes of the sound-absorbing cavities are different; wherein a plurality of through holes are opened in the sound-absorbing cavity area of the sleeve body between the annular partitions, and the through holes communicate with the sound-absorbing cavities circumferentially.

[0009] In the above technical solution, between the smallest diameter end of the starting section of the annular outer shell and the sleeve, and between the largest diameter end of the ending section of the annular outer shell and the sleeve, both are blocked by the annular partitions at both ends respectively; both ends of the sleeve extend out from the annular partitions at both ends.

[0010] In the above technical solution, in the annular outer shell, the end with a smaller diameter in the starting section is set as the inlet, and the end with a larger diameter in the ending section is set as the outlet.

[0011] In the above technical solution, each sound-absorbing cavity is a Helmholtz resonance cavity.

[0012] In the above technical solution, different sound-absorbing cavities are correspondingly set with different sound-absorbing frequencies, and the sound-absorbing frequencies at least cover 300 - 420 Hz and 600 - 840 Hz.

[0013] In the above technical solution, the muffler is an axisymmetric structure, and the axis is the central axis of the sleeve.

[0014] In the above technical solution, the sleeve, the annular partitions and the annular outer shell are all coaxially arranged.

[0015] In the above technical solution, the plurality of annular partitions are arranged at equal intervals or unequal intervals.

[0016] In the above technical solution, the axially separated muffler chambers are greater than or equal to two.

[0017] In the above technical solution, the shapes of the through holes are at least one of circular holes, elliptical holes, and square holes.

[0018] In the above technical solution, the sizes of the through holes are the same or different.

[0019] In the above technical solution, the through holes are arranged at equal or unequal circumferential intervals.

[0020] In the above technical solution, the through holes are arranged at equal or unequal axial intervals.

[0021] In the above technical solution, the muffler chamber space is filled with sound-absorbing materials.

[0022] A refrigeration system is characterized in that the above muffler is arranged downstream of the compressor exhaust port, the inlet end of the muffler is connected to the compressor exhaust port, and the outlet end of the muffler is connected to the inlet of the exhaust pipe. Alternatively, the muffler is arranged at any position on the entire exhaust pipe section downstream of the compressor exhaust port, that is: the inlet end of the muffler is connected to one section of the exhaust pipe, and the outlet end of the muffler is connected to another section of the exhaust pipe.

[0023] Thus, the present utility model provides a muffler and a direct device using the same, including a sleeve, a plurality of annular partitions, and a plurality of annular outer shells. The sleeve, adjacent annular partitions, and outer shells enclose to form muffler chambers, and the volumes of the muffler chambers are different. Among them, the sleeve is provided with a plurality of through holes, and the through holes communicate with the muffler chambers. The muffling frequencies corresponding to different muffler chambers are different, and multiple muffler chambers can achieve muffling of multiple frequencies.

[0024] The present utility model has the following beneficial effects compared with the prior art:

[0025] 1. The volumes of multiple muffling chambers are different, so they have different muffling frequencies to achieve broadband muffling; and the muffler has an axisymmetric structure, which is easier to process and manufacture.

[0026] 2. The apertures of the muffling holes are relatively large and the number is small, which can reduce the drilling working hours, and the process of opening holes in the inner layer is simple.

[0027] 3. The stepped or frustum-shaped non-equal-diameter structure can eliminate the process of making flow direction marks. Workers can easily distinguish the inlet end and the outlet end according to the drawings, which not only saves working hours, but also facilitates the production and assembly of workers. It can also greatly reduce the poor muffling effect caused by assembly errors, and ensure the good noise reduction level of the unit. Description of the Drawings

[0028] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a half-sectional perspective view of the muffler of the present utility model.

[0030] Figure 2 It is an axonometric perspective view of the present utility model from the inlet end.

[0031] Figure 3 It is an axonometric perspective view of the present utility model from the outlet end.

[0032] Figure 4 It is a noise detection transmission loss curve graph of the present utility model.

[0033] Figure 5 It is a half-sectional front view of another embodiment of the present utility model.

[0034] Figure 6 For Figure 5 It is a half-sectional perspective view of the embodiment.

[0035] Figure 7 For Figure 5 It is an axonometric perspective view of the embodiment from the inlet end.

[0036] Figure 8 For Figure 5 It is an axonometric perspective view of the embodiment from the outlet end.

[0037] The corresponding reference numerals in the figure are as follows: 1 - muffler; 11 - sleeve; 11A - inlet end; 11B - outlet end; 111 - through hole; 12 - annular partition; 121 - first partition; 122 - second partition; 123 - third partition; 124 - fourth partition; 13 - annular outer shell; 131 - first outer shell; 132 - second outer shell; 133 - third outer shell; 14 - sound absorption cavity; 141 - first sound absorption cavity; 142 - second sound absorption cavity; 143 - third sound absorption cavity. Detailed implementation manners

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Accordingly, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0040] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it will not be necessary to further define and explain it in subsequent figures.

[0041] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0042] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0043] In the description of the present application, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0045] The features and performance of this application will be further described in detail below in conjunction with the embodiments.

[0046] Embodiment 1

[0047] As Figures 1-3 , the muffler 1 implemented according to the present utility model includes, from the inside to the outside: a sleeve 11 and a plurality of annular outer shells 13, and a plurality of annular partitions 12 are arranged radially between the sleeve 11 and the plurality of annular outer shells 13; the annular partitions seal between each annular outer shell 13 and the sleeve 11 to form an annular sound-absorbing cavity 14.

[0048] The annular partitions 12 are sleeved outside the sleeve 11 and are arranged at intervals along the axis of the sleeve 11. The diameters of the plurality of annular outer shells 13 are different and are distributed in a stepped manner along the axial direction of the sleeve in an increasing or decreasing manner. The smallest diameter end of the starting section annular outer shell 13 and the sleeve 11 are sealed by the annular partition 12 with the smallest diameter. Both ends of the sleeve 11 extend out from the annular partitions 12 at both ends.

[0049] The annular outer shell 13 is arranged between adjacent annular partitions 12. The sleeve 11, the adjacent annular partitions 12 and the annular outer shell 13 enclose and form a plurality of separated sound-absorbing cavities 141-143. The plurality of separated sound-absorbing cavities 141-143 are connected in series along the axial direction of the cylinder body to form the sound-absorbing cavity 14. Each of the separated sound-absorbing cavities 141-143 is not interconnected axially.

[0050] The sleeve 11 is provided with a plurality of through holes 111 along the circumferential direction. Each through hole 111 communicates with each corresponding separated sound-absorbing cavity 141-143. The outer diameters of each annular partition 12 are different, the outer diameters of each annular outer shell 13 are also different, and the volumes of each corresponding separated sound-absorbing cavity 141-143 are also different. Due to the existence of the partitions, each of the separated sound-absorbing cavities 141-143 is not interconnected axially. The sleeve 11, the annular partitions 12 and the annular outer shells 13 are all coaxially arranged.

[0051] In some embodiments, the multiple annular partitions 12 can be arranged at equal intervals or at unequal intervals. The partitioned muffler chambers 14 can be two, three, or more. The muffler chamber 14 is a Helmholtz resonance chamber, and each muffler chamber 14 can eliminate noises of different frequencies.

[0052] The sizes of the through holes 111 can be the same or different. The through holes 111 can be arranged at equal intervals or at unequal intervals circumferentially. Similarly, the through holes 111 can be arranged at equal intervals or at unequal intervals along the axial direction of the sleeve 11.

[0053] The shape of the through hole 111 can be a round hole, an oval hole, or a square hole. Different-shaped through holes 111 can be provided in one sleeve 11.

[0054] Along the axial direction of the sleeve 11, a first partition 121, a second partition 122, a third partition 123, and a fourth partition 124 are sequentially arranged at equal intervals on the muffler 1. A first outer shell 131 is arranged between the first partition 121 and the second partition 122, a second outer shell 132 is arranged between the second partition 122 and the third partition 123, and a third outer shell 133 is arranged between the third partition 123 and the fourth partition 124. Among them, the first partition 121, the second partition 122, the first outer shell 131, and the sleeve 11 enclose to form a first muffler chamber 141. The same applies to the second muffler chamber 142 and the third muffler chamber 143.

[0055] After the air flow enters the inlet end 11A of the muffler, a part of the gas first reaches the outlet end 11B of the muffler through the main flow channel of the sleeve 11, and another part of the gas enters the muffler chamber 14 through the through holes 111. Since the muffler chamber is a Helmholtz resonance chamber, it has strong frequency selectivity and a larger muffling amplitude. At the same time, due to the different volumes of the first muffler chamber 141, the second muffler chamber 142, and the third muffler chamber 143, the muffling frequencies corresponding to each muffler chamber are also different, thereby achieving a wider muffling frequency range.

[0056] Preferably, the diameter of the sleeve 11 is 200 mm, the through holes 111 are round holes with a diameter of 50 mm, nine through holes 111 are arranged at equal intervals circumferentially, and six through holes 111 are arranged at equal intervals axially. As follows Figure 4 As shown in the transmission loss curve diagram of the present invention, the pressure pulsation of the gas is attenuated through the muffler chamber 14, thereby reducing the pulsation noise and further reducing the noise of the entire unit.

[0057] Compared with the equal-diameter outer shape structure in the prior art, the appearance of the inlet side and the outlet side is the same. If the inner chamber is not equally divided, it is difficult to distinguish the inlet end and the outlet end without making a flow direction mark, which is extremely likely to cause reverse installation during the assembly process. On the one hand, it is not conducive to the production operation of workers, and on the other hand, it affects the noise reduction effect of the actual unit.

[0058] The muffler 1 of the present utility model has a stepped structure, which can eliminate the process of making flow direction marks. Workers can easily distinguish the inlet end and the outlet end according to the drawings, thus saving working hours, facilitating the production and assembly of workers, and greatly reducing the poor sound insulation effect caused by assembly errors, ensuring a good noise reduction level of the unit.

[0059] Optionally, the connection mode between the annular partition 12 and the sleeve 11 can be welding, abutting, gluing, threaded connection, etc.

[0060] Embodiment 2:

[0061] The muffler 1 can be arranged in the exhaust pipe section of the compressor. Among them, the inlet end 11A is connected to a section of the exhaust pipe, and the outlet end 11B is connected to another section of the exhaust end. In this way, the air flow in the exhaust pipe can flow into the muffler from the inlet end 11A, then flow out of the muffler from the outlet end 11B, and finally enter the exhaust pipe.

[0062] Embodiment 3:

[0063] Optionally, the muffler 1 can also be arranged between the compressor and the exhaust pipe, that is, the inlet end 11A of the muffler 1 is connected to the compressor outlet, and the outlet end 11B is connected to the exhaust pipe inlet. In this way, the gas discharged from the compressor can directly enter the muffler and then enter the exhaust pipe. The closer the muffler 1 is to the compressor side, the better the sound insulation effect.

[0064] Embodiment 4:

[0065] Optionally, sound-absorbing materials can be filled in each partitioned sound insulation space of the sound insulation cavity 14 to form an impedance compound muffler, further improving the sound insulation frequency range and amplitude of the muffler.

[0066] Embodiment 5:

[0067] As Figures 5-8 shown, different from Embodiment 1, there is a sleeve 11 and a frustum-shaped annular outer shell 13. The minimum diameter end of the starting section of the annular outer shell and the sleeve 11 are blocked by an annular partition 12. Both ends of the sleeve 11 extend out from the annular partitions 12 at both ends. A plurality of annular partitions 12 are arranged radially between the sleeve 11 and an annular outer shell 13; the annular partitions block the space between the annular outer shell 13 and the sleeve 11 to form an annular sound insulation cavity 14.

[0068] Using a frustum-shaped outer shell instead of multiple annular outer shells can reduce the components of the muffler, thereby reducing welding and assembly, simplifying the process, and saving working hours.

[0069] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts fall within the scope of protection of this application.

Claims

1. A muffler, characterized in that include: A casing, a plurality of annular baffles, and an annular housing arranged in a truncated cone cylinder shape; The sleeve, adjacent annular partitions and the outer shell are arranged to form axially separated muffler chambers, each of which has a different volume; wherein the sleeve body is provided with a plurality of through holes in the muffler chamber area between the annular partitions, and the through holes are circumferentially connected to the muffler chambers.

2. The muffler according to claim 1, characterized in that The area between the minimum diameter end of the annular shell of the starting section and the casing, and the area between the maximum diameter end of the annular shell of the ending section and the casing are respectively blocked by annular partitions at both ends; the two ends of the casing extend from the annular partitions at both ends.

3. The muffler according to claim 1, characterized in that In the annular housing, the end with a smaller diameter at the starting section is set as an inlet, and the end with a larger diameter at the ending section is set as an outlet.

4. The muffler according to claim 1, characterized in that The muffler is an axisymmetric structure, and the axis is the central axis of the sleeve.

5. The muffler according to claim 1, characterized in that The plurality of annular partitions are arranged at equal or unequal intervals.

6. The muffler according to claim 1, characterized in that The number of axially separated silencer cavities is greater than or equal to two.

7. The muffler according to claim 1, characterized in that The shape of each through hole is at least one of a circular hole, an elliptical hole, and a square hole.

8. The muffler according to claim 1, characterized in that The through holes are arranged at equal or unequal intervals along the circumferential direction; and / or the through holes are arranged at equal or unequal intervals along the axial direction.

9. The muffler according to claim 1, characterized in that The anechoic cavity space is filled with sound absorbing material.

10. A refrigeration system comprising a compressor and an exhaust pipe, characterized in that A muffler as described in any one of claims 1 to 9 is arranged downstream of the compressor exhaust port, and the muffler is arranged between the compressor and the exhaust pipe; or the muffler is arranged at any position on the entire exhaust pipe section downstream of the compressor exhaust port, and the inlet end of the muffler is connected to one section of the exhaust pipe, and the outlet end of the muffler is connected to another section of the exhaust pipe.

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