Silencer and compressor comprising same

Abstract

The utility model provides a silencer and a compressor comprising the silencer, the silencer is arranged on one side, deviating from a cylinder, of a cylinder cover of the compressor, and the silencer comprises an edge part, an extension part and a central part which are connected in sequence; an accommodating position of the cylinder cover is formed on the inner circumference of the edge part; the central part is of an inner folded edge structure, and the inner diameter of the central part is connected with the periphery of a shaft neck of the cylinder cover in a sealed mode. The silencer is sleeved on the periphery of the shaft neck of the cylinder cover through the central part of the inner flanging structure, the sealing effect can be achieved through the interference fit of the central part and the shaft neck, meanwhile, the number of parts forming sealing is reduced, and the assembling efficiency and the sealing performance of a compressor are improved. Besides, in the operation process of the compressor, high-pressure gas in the silencer can enable the linear section of the silencer to be better pressed on the periphery of the shaft neck of the cylinder cover, and self-sealing of the inner folding edge structure of the silencer and the shaft neck of the cylinder cover is achieved.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and more specifically, to a muffler and a compressor including the muffler. Background Technology

[0002] As a core component of refrigeration and air conditioning equipment, the reliability and energy efficiency of the rotary compressor directly affect the overall performance of the machine. During compressor operation, the muffler, as a key structure for reducing airflow pulsation and noise, plays a crucial role in the sealing performance between itself and the cylinder head shaft. The current mainstream sealing solution uses an interference fit between the muffler's convex ring and the cylinder head shaft end face to form a line seal, utilizing the pressure of their contact surfaces to prevent gas leakage. However, this solution faces significant technical bottlenecks in practical applications.

[0003] First, the machining accuracy (especially parallelism) of the muffler ring directly affects the sealing effect. Because the compressor operates under high temperature, high pressure, and high-frequency vibration conditions for extended periods, the muffler ring is prone to parallelism deviations due to material deformation or machining errors. When the ring is not parallel to the cylinder head shaft end face, a local gap will appear in the originally designed line seal area, leading to seal failure. This gap will cause leakage of high-pressure gas inside the muffler, resulting in two negative impacts: First, the leaked gas carries lubricating oil out, causing the oil level inside the compressor to drop, deteriorating the lubrication conditions of key moving parts (such as the crankshaft and vanes), accelerating wear, and even causing seizure failure; second, gas leakage will reduce the compressor's volumetric efficiency, increase energy consumption, and simultaneously exacerbate airflow pulsation and noise, further affecting system stability.

[0004] Furthermore, existing line seal technologies relying on interference fits place extremely high demands on assembly processes. Improper control of the pressing angle or pressure between the muffler and cylinder head shaft during assembly can directly compromise the flatness of the sealing surface, leading to early leakage risks. While existing solutions attempt to mitigate these issues by improving machining accuracy or optimizing assembly parameters, their effectiveness is limited by cost control and process complexity. Therefore, there is an urgent need for a sealing structure that can adapt to machining errors and operating condition fluctuations, possessing higher reliability, to address the leakage problem caused by the parallelism sensitivity of existing line seal technology, thereby improving the long-term stability and energy efficiency of the compressor.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To address the problems in existing technologies, the purpose of this utility model is to provide a muffler and a compressor including the muffler. This muffler, through its inner folded edge structure, is fitted onto the outer periphery of the cylinder head journal, achieving a sealing effect through an interference fit. This reduces the number of sealing components, improves compressor assembly efficiency, and thus lowers manufacturing costs. Furthermore, during compressor operation, the high-pressure gas inside the muffler causes the straight section of the muffler to better press against the outer periphery of the cylinder head journal, achieving a self-sealing between the muffler's inner folded edge structure and the cylinder head journal.

[0007] The first aspect of this utility model provides a muffler disposed on the side of the cylinder head of a compressor away from the cylinder, comprising an edge portion, an extension portion and a central portion connected in sequence.

[0008] The inner periphery of the edge portion forms a receiving position for the cylinder head;

[0009] The central part has an inwardly folded edge structure, and the inner diameter of the central part is sealed to the outer periphery of the journal of the cylinder head.

[0010] According to a first aspect of the present invention, the central portion includes a straight line segment parallel to the outer periphery of the journal of the cylinder head;

[0011] The length of the straight line segment is L, which satisfies: L≥0.8mm.

[0012] According to a first aspect of the present invention, the length L of the straight segment satisfies: 1mm≦L≦2.5mm.

[0013] According to a first aspect of the present invention, an arc is provided between the extension portion and the central portion.

[0014] According to a first aspect of the present invention, the central portion further includes a head connected to the straight segment, the head being provided with a guide chamfer.

[0015] According to a first aspect of the present invention, the radius of curvature of the guide chamfer is R1, which satisfies that R1 is greater than or equal to 1 mm.

[0016] A second aspect of this invention provides a compressor that includes the silencer described in the first aspect.

[0017] According to a second aspect of the present invention, the compressor further includes a cylinder head;

[0018] The central portion is sealed to the journal of the cylinder head via an interference fit.

[0019] According to a second aspect of the present invention, the inner diameter of the central portion is D1, and the outer circumference of the journal of the cylinder head is D2, satisfying: 0 < D2 - D1 ≤ 0.25 mm.

[0020] According to a second aspect of the present invention, the inner diameter of the central portion is D1, and the outer circumference of the journal of the cylinder head is D2, satisfying: 0.04mm≤D2-D1≤0.16mm.

[0021] The muffler of this invention features an inner folded edge structure that fits around the outer periphery of the cylinder head journal. The interference fit between the two achieves a sealing effect, while simultaneously reducing the number of sealing components and improving compressor assembly efficiency and sealing performance. Furthermore, during compressor operation, the high-pressure gas inside the muffler causes the straight section of the muffler to press more effectively against the outer periphery of the cylinder head journal, achieving a self-sealing effect between the inner folded edge structure of the muffler and the cylinder head journal. Attached Figure Description

[0022] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the structure of a muffler according to an embodiment of the present invention; and

[0024] Figure 2 This is a partial structural schematic diagram of a compressor according to an embodiment of the present invention. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted.

[0026] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and settings are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0029] The structure of the muffler and compressor including the muffler of this utility model is further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments are not intended to limit the scope of protection of this utility model.

[0030] Figure 1 This is a schematic diagram of the structure of a muffler according to an embodiment of the present utility model. Specifically, the muffler 1 is disposed on the side of the compressor cylinder head away from the cylinder, and includes an edge portion 11, an extension portion 12 and a central portion 13 connected in sequence, wherein the inner periphery of the edge portion 11 forms a receiving position 111 of the cylinder head.

[0031] The central section 13 has an inwardly folded edge structure, and the center of this structure is the through hole for accommodating the cylinder head journal. The inner diameter of the central section 13 is sealed to the outer circumference of the cylinder head journal. This sealing connection can be achieved through an interference fit, where the outer circumference of the cylinder head journal is slightly larger than the inner diameter of the central section. During assembly, external force (press-in method) or a temperature difference method (heating hole / cooling shaft) is required to bond the two together. After assembly, the contact pressure generated by elastic deformation forms a firm connection between the inner diameter of the central section 13 and the outer circumference of the cylinder head journal.

[0032] More specifically, the central portion 13 includes a straight segment parallel to the outer periphery of the cylinder head journal; this straight segment is the mating surface between the muffler 1 and the outer periphery of the cylinder head journal. To increase the mating surface between the inner diameter of the inner flange structure of the muffler 1 and the outer diameter of the cylinder head journal, thereby reducing gas leakage within the muffler and ensuring better sealing between the central portion 13 and the outer periphery of the cylinder head journal, the length L of the straight segment of the central portion 13 satisfies: L ≥ 0.8 mm. Further, the length of the straight segment 1 ≦ L ≦ 2.5 mm. Simultaneously, the aforementioned length of the straight segment of the central portion 13 can disperse stress through contact, preventing interference fit failure between the inner diameter of the central portion and the outer periphery of the cylinder head journal.

[0033] The extension 12 can be considered as the connecting section between the edge portion 11 and the central portion 13. It can be set as an inclined surface according to the height of the muffler 1, and a stepped structure can be provided on the inclined surface. An elastic arc A can be provided between the extension 12 and the central portion 13.

[0034] In some embodiments, the central portion 13 further includes a head connected to the straight line segment, the head being provided with a guide chamfer B, the radius of curvature of the guide chamfer B being R1, preferably, the radius of curvature of the guide chamfer B being R1 greater than or equal to 1 mm.

[0035] This utility model also provides a compressor. Figure 2 This is a partial structural diagram of a compressor according to an embodiment of the present invention. The compressor includes a housing and a motor assembly and a pump assembly housed within the housing. The pump assembly of the compressor includes a crankshaft, a cylinder, an upper cylinder head, an upper muffler (not shown in the figure), a lower cylinder head 2, and a lower muffler. The crankshaft (not shown in the figure) passes through the cylinder. The muffler of the present invention can be disposed on either the upper cylinder head or the lower cylinder head; that is, both the upper and lower mufflers can use the muffler described in the present invention. The upper cylinder head and the upper muffler are sequentially disposed on the upper side of the cylinder, and the lower cylinder head 2 and the lower muffler are sequentially disposed on the lower side of the cylinder.

[0036] Taking the muffler installed in the lower cylinder head as an example, the central part 13 and the journal of the lower cylinder head 2 are sealed by an interference fit. The inner diameter of the central part 13 is D1, and the outer circumference of the journal of the lower cylinder head 2 is D2, satisfying: 0 < D2 - D1 ≤ 0.25 mm, preferably 0.04 mm ≤ D2 - D1 ≤ 0.16 mm. The above structure can not only meet the sealing requirements between the bearings of the central part 13 and the lower cylinder head 2, reducing gas leakage in the muffler, but also reduce the force exerted by the muffler on the journal of the lower cylinder head 2, thereby reducing the deformation of the lower cylinder head. When the muffler is installed in the upper cylinder head, the difference between the outer circumference of the journal of the upper cylinder head and the inner diameter of the central part of the muffler can also be within the above value range.

[0037] When the press-fit method is used to assemble the journal of the muffler 1 and the lower cylinder head 2, the guide chamfer B can make it easier for the journal of the lower cylinder head 2 to be pressed into the central part 13 of the muffler (the through hole formed by the inner folded edge structure), reducing the assembly precision and the pressing force during pressing, avoiding scratching the mating surface of the central part 13, thereby improving the assembly yield.

[0038] Furthermore, the radius R2 of the elastic arc A between the extension 12 and the central portion 13 can be between 0.5-1mm. When the journal of the lower cylinder head is pressed into the through hole of the inner folded structure, the elastic arc A undergoes elastic deformation due to force, which facilitates the pressing of the journal of the lower cylinder head into the through hole of the inner folded structure of the muffler. After the journal of the lower cylinder head is pressed in, the elastic arc A drives the inner folded structure of the muffler 1 to move during the process of returning to its original position, causing it to generate a radial force on the journal of the lower cylinder head. As a result, the straight edge section of the central portion 13 of the muffler can better press on the outer circumference of the journal of the lower cylinder head, thereby further enhancing the sealing between the inner diameter of the inner folded structure of the muffler and the outer circumference of the journal of the lower cylinder head. Meanwhile, during the long-term use of the compressor, material creep, vibration, or temperature fluctuations may cause the preload of the interference fit between the journal of the lower cylinder head and the muffler to gradually decrease. The radial rebound force of the elastic arc A continuously acts on the inner folded edge structure and dynamically compensates for such relaxation, so that the inner folded edge structure and the journal of the lower cylinder head always maintain close contact and maintain stable sealing pressure.

[0039] The air blowing test showed that the seal between the muffler and the cylinder head journal of this invention was good. The air blowing test showed that there were no air bubbles between the two, that is, there was no gas leakage between the muffler and the cylinder head journal of this invention, and the seal met the requirements of the compressor.

[0040] In summary, the muffler of this invention achieves a sealing effect by fitting the central part of its inner folded edge structure onto the outer circumference of the cylinder head journal through an interference fit. This reduces the number of sealing components, improving compressor assembly efficiency and sealing performance. Furthermore, during compressor operation, the high-pressure gas inside the muffler causes the straight section of the muffler to press more effectively against the outer circumference of the cylinder head journal, achieving a self-sealing effect between the muffler's inner folded edge structure and the cylinder head journal.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0042] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A silencer, characterized in that, Located on the side of the compressor cylinder head away from the cylinder, it includes an edge portion, an extension portion, and a central portion connected in sequence; The inner periphery of the edge portion forms a receiving position for the cylinder head; The central part has an inwardly folded edge structure, and the inner diameter of the central part is sealed to the outer periphery of the journal of the cylinder head.

2. The silencer according to claim 1, characterized in that, The central portion includes a straight line segment parallel to the outer periphery of the journal of the cylinder head; The length of the straight line segment is L, which satisfies: L≥0.8mm.

3. The silencer according to claim 2, characterized in that, The length L of the straight line segment satisfies: 1mm≦L≦2.5mm.

4. The silencer according to claim 1, characterized in that, An arc is provided between the extension and the central portion.

5. The silencer according to claim 2, characterized in that, The central portion also includes a head connected to the straight segment, and the head is provided with a guide chamfer.

6. The silencer according to claim 5, characterized in that, The radius of curvature of the guide chamfer is R1, which satisfies the condition that R1 is greater than or equal to 1 mm.

7. A compressor, characterized in that, Includes the silencer as described in any one of claims 1 to 6.

8. The compressor according to claim 7, characterized in that, The compressor also includes a cylinder head; The central portion is sealed to the journal of the cylinder head via an interference fit.

9. The compressor according to claim 8, characterized in that, The inner diameter of the central part is D1, and the outer circumference of the cylinder head journal is D2, satisfying 0 < D2 - D1 ≤ 0.25 mm.

10. The compressor according to claim 7, characterized in that, The inner diameter of the central part is D1, and the outer circumference of the cylinder head journal is D2, satisfying: 0.04mm≤D2-D1≤0.16mm.

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