Compressor step noise reduction structure and double cylinder compressor and step noise reduction structure thereof

Abstract

The utility model provides a kind of compressor grading sound-absorbing structure and double cylinder compressor and its grading sound-absorbing structure, grading sound-absorbing structure includes upper sound absorber;Upper sound absorber is set in upper cylinder cover, and the outer layer of upper sound absorber includes first flanging part and first cavity part, and first cavity part has first sound-absorbing chamber, and multiple first sound-absorbing chambers are communicated;The inner layer of upper sound absorber includes second flanging part and second cavity part, and second cavity part has second sound-absorbing chamber, and multiple second sound-absorbing chambers are communicated;At least one second sound-absorbing chamber is communicated with the first exhaust hole of upper cylinder cover, and second cavity part is equipped with at least one first through hole and is communicated with first sound-absorbing chamber, and second flanging part is equipped with at least one second through hole and is communicated with first sound-absorbing chamber, and first cavity part is equipped with gas outlet, and second through hole is communicated with the second exhaust hole of upper cylinder cover.The utility model can make the gas discharged by cylinder separate when entering upper sound absorber, can avoid airflow mixing to generate interference, reduce airflow resistance and reduce power consumption.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a compressor staged noise reduction structure and a twin-cylinder compressor and its staged noise reduction structure. Background Technology

[0002] Twin-cylinder rotary compressors are widely used in modern household air conditioners and commercial refrigeration equipment. These compressors typically consist of two cylinders arranged vertically and two rollers that roll within the cylinders, all driven by a crankshaft to compress the gas.

[0003] In existing twin-cylinder rotary compressors, a common design is to combine the exhaust gases from the upper and lower cylinders and introduce them into the same silencing chamber. That is, the refrigerant gas compressed by the upper and lower cylinders is discharged into a silencing chamber through their respective exhaust valves and exhaust ports for pulsation reduction and noise reduction before entering the subsequent condenser piping.

[0004] However, through in-depth research and practice, the inventors of this application have discovered that this conventional design of "combining the exhaust of two cylinders into the same muffler chamber" has significant technical defects, mainly in the following two aspects:

[0005] First, there is the issue of airflow interference and noise. Due to the different compression phases of the upper and lower cylinders, their exhaust timing and exhaust airflow pulsation characteristics differ. When these two asynchronous, periodic exhaust airflows suddenly converge in the same muffler, they generate severe mutual interference and impact. This interference not only disrupts the stable flow field within the muffler but also significantly exacerbates the pressure pulsation within the muffler, making it difficult to effectively reduce mid-frequency noise. Consequently, the overall noise level of the compressor, especially the annoying mid-frequency noise, is difficult to control effectively.

[0006] Secondly, there are issues of flow resistance and energy efficiency. The mixing of two high-speed exhaust streams within a confined shared space generates complex vortices and secondary flows, leading to a sharp increase in flow resistance. This increased flow resistance directly manifests as a rise in exhaust back pressure. Increased exhaust back pressure means the compressor needs to consume more extra work to overcome the exhaust resistance and expel the gas, resulting in increased compressor power consumption, higher overall input power, and a lower coefficient of performance (COP). This contradicts the current industry's stringent requirements for high efficiency and energy saving in home appliances.

[0007] In summary, the existing design of twin-cylinder rotary compressors, which combines the exhaust gases from the upper and lower cylinders into a single silencer chamber, suffers from two inherent defects: increased pressure pulsation and prominent mid-frequency noise due to mutual interference between the exhaust gas flows from the two cylinders; and increased exhaust back pressure and compressor power consumption due to increased flow resistance after the exhaust gases are mixed. These problems severely restrict performance improvements in both noise reduction and efficiency of twin-cylinder compressors. Utility Model Content

[0008] The purpose of this invention is to provide a compressor staged silencing structure and a twin-cylinder compressor and its staged silencing structure, which can separate the gas discharged from the upper cylinder and the lower cylinder when they enter the upper silencer, thereby avoiding the interference caused by the airflow mixing between the upper and lower cylinders, effectively reducing airflow resistance and compressor power consumption, and thus achieving the goal of improving both performance and noise.

[0009] To achieve the above objectives, this utility model provides a staged silencing structure for a dual-cylinder compressor. The staged silencing structure is installed on a cylinder assembly, which includes an upper cylinder and a lower cylinder. The staged silencing structure includes an upper silencer.

[0010] The upper muffler includes an outer layer and an inner layer. The upper muffler is disposed on the outer surface of the upper cylinder head of the upper cylinder. The outer layer of the upper muffler includes a first flange and a first cavity. The first flange surrounds the first cavity, and the first cavity has multiple first muffler chambers that are interconnected. The inner layer of the upper muffler includes a second flange and a second cavity. The second flange surrounds the second cavity, and the second cavity has multiple second muffler chambers that are interconnected. At least one second muffler chamber communicates with a first exhaust port on the upper cylinder head. The second cavity has at least one first through hole communicating with the first muffler chamber. The second flange has at least one second through hole communicating with the first muffler chamber. The first cavity has at least one exhaust port, and the second through hole communicates with a second exhaust port on the upper cylinder head.

[0011] The exhaust path of the upper cylinder includes the first exhaust port, the second muffler chamber, and the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port; the exhaust path of the lower cylinder includes the second exhaust port, the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port.

[0012] Optionally, the graded muffler structure includes a lower muffler, which is disposed on the outer surface of the lower cylinder head of the lower cylinder. The lower muffler has a third muffler chamber, and the lower cylinder head is provided with a third exhaust port for communicating with the third muffler chamber. The refrigerant gas in the lower cylinder first enters the third muffler chamber through the third exhaust port, and then enters the first muffler chamber, without interfering with the refrigerant gas in the second muffler chamber.

[0013] Optionally, the cylinder assembly includes an intermediate plate located between the upper cylinder and the lower cylinder. The lower cylinder head has a third through hole, the cylinder wall of the lower cylinder has a fourth through hole, the intermediate plate has a fifth through hole, and the cylinder wall of the upper cylinder has a sixth through hole. The third through hole, the fourth through hole, the fifth through hole, the sixth through hole, the second exhaust hole, and the second through hole are sequentially connected to form an exhaust channel. The refrigerant gas in the third muffler chamber enters the first muffler chamber through the exhaust channel.

[0014] Optionally, the outer layer of the upper muffler is mounted on the upper cylinder head via the first flange, and the inner layer of the upper muffler is mounted on the upper cylinder head via the second flange. The second flange is in contact with the outer surface of the upper cylinder head, the first flange is in contact with the second flange, and the second flange is located between the first flange and the upper cylinder head.

[0015] Optionally, the first silencing cavity communicating with the first through hole and the first silencing cavity communicating with the second through hole are different first silencing cavities, and the first exhaust hole is connected to the second silencing cavity having the first through hole.

[0016] Optionally, the outer layer of the upper muffler is provided with a first crankshaft through hole, and the inner layer of the upper muffler is provided with a second crankshaft through hole, both the first crankshaft through hole and the second crankshaft through hole being used for the crankshaft to pass through.

[0017] Optionally, the number of first silencing chambers is four, and the four first silencing chambers are arranged around the first crankshaft through hole. The number of second silencing chambers is also four, and the four second silencing chambers are arranged around the first crankshaft through hole. The positions of the first silencing chambers and the positions of the second silencing chambers correspond one-to-one.

[0018] Optionally, there are two air outlets, which are located on two opposite first silencing cavities. At least one of the remaining first silencing cavities communicates with the second through hole, and the first through hole communicates with the first silencing cavity having the air outlet.

[0019] Based on another aspect of this utility model, this utility model also provides a dual-cylinder compressor, which includes the graded noise reduction structure described above.

[0020] In another aspect, this utility model also provides a compressor staged silencing structure, the staged silencing structure including an upper muffler; the upper muffler includes an outer layer and an inner layer, the upper muffler is disposed on the outer surface of the upper cylinder head, the outer layer of the upper muffler includes a first flange and a first cavity, the first flange surrounds the first cavity, the first cavity has a plurality of first silencing chambers, and the plurality of first silencing chambers are interconnected; the inner layer of the upper muffler includes a second flange and a second cavity, the second flange surrounds the second cavity, the second cavity has a plurality of second silencing chambers, and the plurality of second silencing chambers are interconnected. The second muffler chamber is connected; at least one of the second muffler chambers is connected to the first exhaust port on the upper cylinder head; the second cavity portion is provided with at least one first through hole connected to the first muffler chamber; the second flange portion is provided with at least one second through hole connected to the first muffler chamber; the first cavity portion is provided with at least one exhaust port; the second through hole is connected to the second exhaust port on the upper cylinder head; one exhaust path sequentially includes the first exhaust port, the second muffler chamber, and the first muffler chamber, and finally exhausts through the exhaust port; another exhaust path sequentially includes the second exhaust port and the first muffler chamber, and finally exhausts through the exhaust port.

[0021] As configured above, the upper muffler of this utility model includes an outer layer and an inner layer. The inner layer is specially designed to separate the gases discharged from the upper and lower cylinders upon entering the upper muffler. Specifically, the exhaust path of the refrigerant gas in the upper cylinder sequentially includes the upper cylinder, the first exhaust port, the second muffler chamber, the first muffler chamber again, and finally exits through the outlet port. The exhaust path of the refrigerant gas in the lower cylinder sequentially includes the lower cylinder, the third exhaust port, the exhaust passage, the first muffler chamber, and finally exits through the outlet port. This staged muffler structure, where the exhaust gas from the upper cylinder passes through the second muffler chamber before entering the first muffler chamber, preferentially reduces some noise. The exhaust gas from the lower cylinder bypasses the second muffler chamber and directly enters the first muffler chamber, preventing airflow mixing between the upper and lower cylinders and effectively reducing airflow resistance and compressor power consumption, thereby achieving a dual improvement in performance and noise reduction. Attached Figure Description

[0022] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0023] Figure 1This is a schematic diagram of the assembly of the staged noise reduction structure and cylinder assembly of a dual-cylinder compressor according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the outer layer and inner layer of the upper muffler according to an embodiment of the present invention;

[0025] Figure 3 This is a line graph showing the noise level versus frequency under low-temperature heating conditions according to an embodiment of the present invention.

[0026] Figure 4 This is a line graph showing the noise level versus frequency under the new national standard operating conditions according to an embodiment of this utility model.

[0027] The accompanying figure is labeled as follows:

[0028] 1-Upper cylinder; 11-Upper cylinder head; 111-First exhaust port; 112-Second exhaust port; 2-Lower cylinder; 21-Lower cylinder head; 211-Third through hole; 22-Fourth through hole; 31-Outer layer of upper muffler; 311-First flange; 3111-First mounting hole; 312-First cavity; 3121-First muffler cavity; 3122-Exhaust port; 313-First crankshaft through hole; 32-Inner layer of upper muffler; 321-Second flange; 3211-Second through hole; 3212-Second mounting hole; 322-Second cavity; 3221-Second muffler cavity; 3222-First through hole; 323-Second crankshaft through hole; 4-Crankshaft; 5-Lower muffler; 51-Third muffler cavity; 6-Intermediate plate; 61-Fifth through hole; 7-Intake port. Detailed Implementation

[0029] In this document, unless otherwise stated, the terms “upper,” “lower,” “left,” “right,” “inner,” “outer,” “front,” “back,” “top,” “bottom,” etc., are used to indicate orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a characteristic orientation and operation, and therefore should not be construed as a limitation of the present invention.

[0030] The specific embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0031] Figure 1 This is an assembly diagram of the staged noise reduction structure of a dual-cylinder compressor and the cylinder assembly according to an embodiment of this utility model. Figure 2 This is a schematic diagram of the outer and inner layers of the upper muffler according to an embodiment of this utility model. Please refer to it. Figure 1 and Figure 2 This utility model embodiment provides a staged silencing structure for a dual-cylinder compressor. The staged silencing structure is installed on a cylinder assembly, which includes an upper cylinder 1 and a lower cylinder 2. The staged silencing structure includes an upper muffler.

[0032] The upper muffler includes an outer layer 31 and an inner layer 32. The upper muffler is disposed on the outer surface of the upper cylinder head 11 of the upper cylinder 1. The outer layer 31 includes a first flange 311 and a first cavity 312. The outer layer 31 is mounted on the upper cylinder head 11 via the first flange 311, which surrounds the first cavity 312. The first cavity 312 has multiple first silencing chambers 3121, and these chambers are interconnected. The inner layer 32... The upper muffler includes a second flange portion 321 and a second cavity portion 322. The second flange portion 321 surrounds the second cavity portion 322. The second cavity portion 322 has multiple second muffler cavities 3221, and the multiple second muffler cavities 3221 are interconnected. The inner layer 32 of the upper muffler is mounted on the upper cylinder head 11 through the second flange portion 321. The second flange portion 321 is fitted with the outer surface of the upper cylinder head 11, thereby preventing gas in the second muffler cavities 3221 from leaking through the gap between the second flange portion 321 and the upper cylinder head 11. The first flange portion 311 is fitted with the second flange portion 321 to prevent air leakage, and the second flange portion 321 is located between the first flange portion 311 and the upper cylinder head 11. Specifically, the second flange portion 321 is provided with a plurality of second mounting holes 3212, and the first flange portion 311 is provided with a plurality of first mounting holes 3111 that correspond one-to-one with and communicate with the second mounting holes 3212. The second mounting holes 3212 and the first mounting holes 3111 are used for bolts to pass through so as to install the upper muffler on the upper cylinder head 11.

[0033] At least one second muffler chamber 3221 communicates with the first exhaust port 111 on the upper cylinder head 11, so that the refrigerant gas of the upper cylinder 1 can be discharged into the second muffler chamber 3221 through the first exhaust port 111. The second cavity portion 322 is provided with at least one first through hole 3222 communicating with the first muffler chamber 3121, so that the refrigerant gas in the second cavity portion 322 can enter the first muffler chamber 3121. Preferably, the first exhaust port 111 communicates with the second muffler chamber 3221 having the first through hole 3222. The second flange portion 321 is provided with at least one second through hole 3211 communicating with the first muffler chamber 3121, and the first cavity portion 312 is provided with at least one vent hole 3122 to discharge the refrigerant gas in the first cavity portion 312. The second through hole 3211 communicates with the second exhaust port 112 on the upper cylinder head 11.

[0034] The exhaust path of the upper cylinder 1 includes the first exhaust port 111, the second muffler chamber 3221, the first muffler chamber 3121, and finally the exhaust through the outlet port 3122; the exhaust path of the lower cylinder 2 includes the second exhaust port 112, the first muffler chamber 3121, and finally the exhaust through the outlet port 3122.

[0035] The outer layer 31 of the upper muffler is provided with a first crankshaft through hole 313, and the inner layer 32 of the upper muffler is provided with a second crankshaft through hole 323. Both the first crankshaft through hole 313 and the second crankshaft through hole 323 are used for the crankshaft 4 to pass through.

[0036] For example, there are four first silencing chambers 3121 arranged around the first crankshaft through-hole 313, and four second silencing chambers 3221 arranged around the first crankshaft through-hole 313. The positions of the first silencing chambers 3121 and the second silencing chambers 3221 correspond one-to-one. Preferably, there are two vent holes 3122 located on two opposite first silencing chambers 3121. At least one of the remaining first silencing chambers 3121 communicates with a second through-hole 3211, and the first through-hole 3222 communicates with the first silencing chamber 3121 with the vent hole 3122.

[0037] Preferably, the first silencing cavity 3121 communicating with the first through hole 3222 and the first silencing cavity 3121 communicating with the second through hole 3211 are different first silencing cavities 3121. For example... Figure 2 As shown, the blue arrow represents the refrigerant gas flow direction of the upper cylinder 1, and the red arrow represents the refrigerant gas flow direction of the lower cylinder 2. The first silencer 3121 that the refrigerant gas of the lower cylinder 2 initially enters is different from the first silencer 3121 that the refrigerant gas of the upper cylinder 1 enters. After the refrigerant gas of the lower cylinder 2 enters the first silencer 3121, it flows from the first silencer 3121 to the adjacent first silencer 3121 (i.e., the first silencer 3121 with the vent 3122) and is discharged through the vent 3122. The refrigerant gas of the upper cylinder 1 directly enters the first silencer 3121 with the vent 3122 and is discharged through the vent 3122.

[0038] The graded muffler structure includes a lower muffler 5, which is located on the outer surface of the lower cylinder head 21 of the lower cylinder 2. The lower muffler 5 has a third muffler chamber 51. The lower cylinder head 21 is provided with a third exhaust port (not shown in the figure) for communicating with the third muffler chamber 51. The refrigerant gas in the lower cylinder 2 first enters the third muffler chamber 51 through the third exhaust port, and then enters the first muffler chamber 3121 without interfering with the refrigerant gas in the second muffler chamber 3221. That is, the refrigerant gas in the upper cylinder 1 and the refrigerant gas in the lower cylinder 2 are separate and do not interfere with each other when entering the upper muffler.

[0039] Furthermore, the cylinder assembly includes an intermediate plate 6 located between the upper cylinder 1 and the lower cylinder 2. The lower cylinder head 21 is provided with a third through hole 211, the cylinder wall of the lower cylinder 2 is provided with a fourth through hole 22, the intermediate plate 6 is provided with a fifth through hole 61, and the cylinder wall of the upper cylinder 1 is provided with a sixth through hole 12. The third through hole 211, the fourth through hole 22, the fifth through hole 61, the sixth through hole 12, the second exhaust hole 112, and the second through hole 3211 are sequentially connected to form an exhaust channel. The refrigerant gas in the third muffler 51 enters the first muffler 3121 through the exhaust channel.

[0040] Please refer to Figure 1 The cylinder assembly also has an intake port 7, which is connected to the upper cylinder 1 and is used to draw refrigerant gas into the cylinder assembly. Part of the refrigerant gas drawn in through the intake port 7 (as shown by the red arrow) enters the lower cylinder 2 through the siphon channel, and then sequentially enters the lower muffler 5, the exhaust channel, and the first muffler chamber 3121. The other part (as shown by the blue arrow) of the refrigerant gas remains in the upper cylinder 1, and after compression, it sequentially enters the second muffler chamber 3221 and the first muffler chamber 3121.

[0041] Based on another aspect of this utility model, this utility model also provides a dual-cylinder compressor, which includes the above-described staged noise reduction structure.

[0042] In another aspect, this utility model also provides a compressor staged silencing structure, applicable to multi-cylinder compressors. The staged silencing structure includes an upper muffler; the upper muffler includes an outer layer and an inner layer, and is disposed on the outer surface of the upper cylinder head. The outer layer includes a first flange and a first cavity, the first flange surrounding the first cavity, the first cavity having multiple first silencing chambers that are interconnected. The inner layer includes a second flange and a second cavity, the second flange surrounding the second cavity, the second cavity having multiple second silencing chambers. The cylinder head has a cavity, and multiple second muffler cavities are connected to each other; at least one second muffler cavity is connected to a first exhaust port on the upper cylinder head, the second cavity body is provided with at least one first through hole connected to the first muffler cavity, the second flange is provided with at least one second through hole connected to the first muffler cavity, the first cavity body is provided with at least one exhaust port, and the second through hole is connected to a second exhaust port on the upper cylinder head; one exhaust path sequentially includes the first exhaust port, the second muffler cavity, and the first muffler cavity, and finally exhausts through the exhaust port; another exhaust path sequentially includes the second exhaust port, the first muffler cavity, and finally exhausts through the exhaust port.

[0043] As configured above, the upper muffler of this utility model includes an outer layer 31 and an inner layer 32. The inner layer 32 is specially designed to separate the gases discharged from the upper cylinder 1 and the lower cylinder 2 upon entering the upper muffler. Specifically, the exhaust path of the refrigerant gas in the upper cylinder 1 (e.g., ...) Figure 1 The blue arrows indicate the sequence of components: upper cylinder 1, first exhaust port 111, second muffler chamber 3221, first muffler chamber 3121, and finally exhaust through outlet port 3122; the exhaust path of the refrigerant gas in lower cylinder 2 (e.g., ...) Figure 1 The structure (marked by the red arrow) sequentially includes a lower cylinder 2, a third exhaust port, an exhaust passage, a first silencer chamber 3121, and finally exhausts through an outlet port 3122. In this staged silencer structure, the exhaust from the upper cylinder 1 passes through the second silencer chamber 3221 before entering the first silencer chamber 3121, which can preferentially reduce some noise. The exhaust from the lower cylinder 2 bypasses the second silencer chamber 3221 and directly enters the first silencer chamber 3121, avoiding interference caused by the mixing of airflows from the upper cylinder 1 and lower cylinder 2. This effectively reduces airflow resistance and compressor power consumption, thereby achieving a dual improvement in performance and noise level. It is understood that this staged silencer structure is applicable not only to dual-cylinder compressors but also to multi-cylinder compressors.

[0044] The following are the results of noise tests conducted under various operating conditions:

[0045] Table 1

[0046] In Table 1, COP represents the operating energy efficiency ratio, and NGB represents the new national standard operating condition. As can be seen from Table 1, the two-cylinder exhaust staged (i.e., using the staged muffler structure of this utility model) has a significant improvement in COP compared to the two-cylinder exhaust without staged (i.e., the existing technology solution).

[0047] Compressor actual test comparison, for example Figure 3 and Figure 4 As shown, Figure 3 For low-temperature heating operation (5400 rpm). Figure 4 The operating condition is based on the new national standard (3600 rpm).

[0048] Figure 3 and Figure 4 The vertical axis represents the noise level (dB), and the horizontal axis represents the frequency (Hz). Figure 3 and Figure 4 The red line represents a two-cylinder exhaust system with staged exhaust, while the blue line represents a two-cylinder exhaust system without staged exhaust. Figure 3 The numbers in the table at the bottom center represent the specific noise peak values ​​for each frequency band. Figure 4 Similarly. From Figure 3 and Figure 4It can be seen that the upper and lower cylinder exhaust staged silencing structure can effectively reduce the noise peak in the mid-frequency range, with a significant reduction in the 1250Hz peak.

[0049] It should be noted that references to "an embodiment," "an embodiment," "a specific embodiment," "some embodiments," etc., in the specification only indicate that the described embodiment may include a specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in conjunction with an embodiment, whether explicitly described or not, implementing such a feature, structure, or characteristic in conjunction with other embodiments is within the knowledge of those skilled in the art.

[0050] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.

[0051] It should also be noted that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the present invention without departing from the scope of the present invention, or equivalent embodiments can be modified based on the disclosed technical content. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the protection scope of the present invention.

[0052] It should also be understood that, unless otherwise specified or indicated, the terms “first,” “second,” “third,” etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and not to indicate the logical or sequential relationships between the various components, elements, and steps.

[0053] Furthermore, it should be recognized that the terminology described herein is used only to describe particular embodiments and not to limit the scope of the invention. It must be noted that the singular forms “a” and “an” used herein and in the appended claims include plural bases unless the context clearly indicates otherwise. For example, a reference to “a step” or “an apparatus” means a reference to one or more steps or apparatuses, and may include secondary steps and secondary apparatuses. All conjunctions used should be understood in the broadest sense. Also, the word “or” should be understood to have the definition of logical “or” rather than logical “exclusive OR”, unless the context clearly indicates otherwise. Furthermore, implementation of the methods and / or devices in embodiments of the invention may include performing selected tasks manually, automatically, or in combination.

Claims

1. A staged noise reduction structure for a dual-cylinder compressor, mounted on a cylinder assembly, the cylinder assembly comprising an upper cylinder and a lower cylinder, characterized in that, The graded noise reduction structure includes an upper silencer; The upper muffler includes an outer layer and an inner layer. The upper muffler is disposed on the outer surface of the upper cylinder head of the upper cylinder. The outer layer of the upper muffler includes a first flange and a first cavity. The first flange surrounds the first cavity, and the first cavity has multiple first muffler chambers that are interconnected. The inner layer of the upper muffler includes a second flange and a second cavity. The second flange surrounds the second cavity, and the second cavity has multiple second muffler chambers that are interconnected. At least one second muffler chamber communicates with a first exhaust port on the upper cylinder head. The second cavity has at least one first through hole communicating with the first muffler chamber. The second flange has at least one second through hole communicating with the first muffler chamber. The first cavity has at least one exhaust port, and the second through hole communicates with a second exhaust port on the upper cylinder head. The exhaust path of the upper cylinder includes the first exhaust port, the second muffler chamber, and the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port; the exhaust path of the lower cylinder includes the second exhaust port, the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port.

2. The staged noise reduction structure for a dual-cylinder compressor as described in claim 1, characterized in that, The graded muffler structure includes a lower muffler, which is disposed on the outer surface of the lower cylinder head of the lower cylinder. The lower muffler has a third muffler chamber, and the lower cylinder head is provided with a third exhaust port for communicating with the third muffler chamber. The refrigerant gas in the lower cylinder first enters the third muffler chamber through the third exhaust port, and then enters the first muffler chamber, without interfering with the refrigerant gas in the second muffler chamber.

3. The staged noise reduction structure for a dual-cylinder compressor as described in claim 2, characterized in that, The cylinder assembly includes an intermediate plate located between the upper cylinder and the lower cylinder. The lower cylinder head has a third through hole, the cylinder wall of the lower cylinder has a fourth through hole, the intermediate plate has a fifth through hole, and the cylinder wall of the upper cylinder has a sixth through hole. The third through hole, the fourth through hole, the fifth through hole, the sixth through hole, the second exhaust hole, and the second through hole are sequentially connected to form an exhaust channel. The refrigerant gas in the third muffler chamber enters the first muffler chamber through the exhaust channel.

4. The staged noise reduction structure for a dual-cylinder compressor as described in claim 1, characterized in that, The outer layer of the upper muffler is mounted on the upper cylinder head via the first flange, and the inner layer of the upper muffler is mounted on the upper cylinder head via the second flange. The second flange is in contact with the outer surface of the upper cylinder head, the first flange is in contact with the second flange, and the second flange is located between the first flange and the upper cylinder head.

5. The staged noise reduction structure for a dual-cylinder compressor as described in claim 1, characterized in that, The first silencing cavity communicating with the first through hole and the first silencing cavity communicating with the second through hole are different first silencing cavities, and the first exhaust hole is connected to the second silencing cavity having the first through hole.

6. The staged noise reduction structure for a dual-cylinder compressor as described in claim 1, characterized in that, The outer layer of the upper muffler is provided with a first crankshaft through hole, and the inner layer of the upper muffler is provided with a second crankshaft through hole. Both the first crankshaft through hole and the second crankshaft through hole are used for the crankshaft to pass through.

7. The staged noise reduction structure for a dual-cylinder compressor as described in claim 6, characterized in that, The number of first silencing chambers is four, and the four first silencing chambers are arranged around the first crankshaft through hole. The number of second silencing chambers is four, and the four second silencing chambers are arranged around the first crankshaft through hole. The positions of the first silencing chambers and the positions of the second silencing chambers correspond one-to-one.

8. The staged noise reduction structure for a dual-cylinder compressor as described in claim 7, characterized in that, The number of air outlets is two, and the two air outlets are respectively located on two opposite first silencing cavities. At least one of the remaining first silencing cavities is connected to the second through hole, and the first through hole is connected to the first silencing cavity with the air outlet.

9. A twin-cylinder compressor, characterized in that, The twin-cylinder compressor includes a graded noise reduction structure as described in any one of claims 1-8.

10. A staged noise reduction structure for a compressor, characterized in that, The graded noise reduction structure includes an upper silencer; The upper muffler includes an outer layer and an inner layer. The upper muffler is disposed on the outer surface of the upper cylinder head. The outer layer includes a first flange and a first cavity. The first flange surrounds the first cavity, and the first cavity has multiple first muffler chambers that are interconnected. The inner layer includes a second flange and a second cavity. The second flange surrounds the second cavity, and the second cavity has multiple second muffler chambers that are interconnected. At least one second muffler chamber communicates with a first exhaust port on the upper cylinder head. The second cavity has at least one first through hole communicating with the first muffler chamber. The second flange has at least one second through hole communicating with the first muffler chamber. The first cavity has at least one exhaust port, and the second through hole communicates with a second exhaust port on the upper cylinder head. One exhaust path includes the first exhaust port, the second muffler chamber, and the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port; the other exhaust path includes the second exhaust port, the first muffler chamber in sequence, and finally the exhaust is discharged through the exhaust port.

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