Scroll compressor including silencer device containing silencing holes

A scroll compressor including a scroll assembly comprising an orbiting scroll and a non-orbiting scroll; and a silencing device provided above the scroll assembly and comprising a partition plate and a silencer. The partition plate is used to divide an interior space of the scroll compressor into a high-pressure chamber and a low-pressure chamber, and the partition plate has a central through-hole. The silencer is arranged above the gas outlet, the silencer is fixed to the central through-hole, and is independent from the scroll assembly. The silencing device of the scroll compressor can eliminate noise and seal the divided high-pressure and low-pressure chambers, and can be arranged flexibly without interfering with the scroll assembly.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is the national phase of International Application No. PCT/CN2019/092245 titled “SCROLL COMPRESSOR” and filed on Jun. 21, 2019, which claims the priority to the Chinese Patent Application NO. 201820985551.1, titled “SCROLL COMPRESSOR”, filed on Jun. 22, 2018, with the China National Intellectual Property Administration, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to scroll apparatus, in particular to a scroll compressor with a silencing device.

BACKGROUND

The content in this section only provides background information related to the present disclosure, which may not constitute prior art.

A compressor is a fluid machine that promotes low-pressure gas to high-pressure gas, and is the core apparatus in a refrigeration system. The scroll compressor is a typical positive displacement compressor. The main part of the scroll compressor is a scroll assembly, which is used to compress a fluid. The scroll assembly generally includes a non-orbiting scroll and an orbiting scroll that are stacked on each other, and a cross slip ring coupled to the non-orbiting scroll and the orbiting scroll respectively to prevent the orbiting scroll from spinning, for example.

The non-orbiting scroll and the orbiting scroll of the scroll assembly cooperates with each other in a stacked manner, where the orbiting scroll is arranged eccentrically opposite to the non-orbiting scroll. A motor in the scroll compressor drives a crankshaft to make the orbiting scroll move along a predetermined trajectory relative to the non-orbiting scroll, so that a series of crescent-shaped compression spaces are formed between the scroll profiles of the orbiting scroll and the non-orbiting scroll.

Significant noise is generated during the working process of the scroll compressor. The noise is mainly the noise of the scroll assembly compressing the gas, the exhaust noise at the gas outlet of the scroll assembly, and the noise of vibration and flapping of the reed valve at the gas outlet of the scroll assembly and the like. At present, many methods have been proposed for isolating or reducing the operating noise of the compressor, such as improving the body structure design of the compressor, equipping the compressor with a soundproof cover, and arranging a silencer at the source of noise. For the solution of arranging a silencer, a known method is to add a silencer to the scroll assembly, which can be used to eliminate exhaust noise at the gas outlet of the scroll assembly and the like.

A scroll compressor with a silencer is known, in which the silencer used is generally a cup-shaped structure, and multiple silencing holes are formed in the side wall of the cup-shaped structure. The silencer is fixedly arranged on the inner hub of the non-orbiting scroll and located above the gas outlet of the non-orbiting scroll, thereby reducing the exhaust noise at the gas outlet.

The silencer used in the existing compressor is directly arranged to the inner hub of the non-orbiting scroll. Based on this structure, a more suitable way to fix the silencer is threaded connection. Threaded connection requires threads to be formed on the circumferential wall of the inner hub of the non-orbiting scroll, so that the inner hub needs to have sufficient thickness of the wall to meet the requirements of both threaded connection and structural strength. Therefore, it is difficult to apply this type of silencer to a compressor with a thinner thickness of the wall of the inner hub of the non-orbiting scroll.

The present disclosure expects to propose a solution to this problem.

SUMMARY

An object of the present disclosure is to provide a scroll compressor with an improved silencing device, the silencing device is flexible in arrangement, has increased versatility, and is suitable for various types of scroll assembly.

Another object of the present disclosure is to provide a scroll compressor with an improved silencing device, which has a simplified structure, is easy to assemble, and has the dual functions of silencing and isolating the high-pressure and low-pressure chambers of the compressor.

For the above purpose, according to one aspect of the present disclosure, a scroll compressor is provided, including: a scroll assembly comprising an orbiting scroll and a non-orbiting scroll, the orbiting scroll and the non-orbiting scroll each including an orbiting scroll profile and a non-orbiting scroll profile and cooperating with each other to form a series of compression chambers, and the scroll assembly defining a gas outlet; and a silencing device arranged above the scroll assembly and including a partition plate and a silencer, the partition plate being configured to divide an internal space of the scroll compressor into a high-pressure chamber and a low-pressure chamber, the partition plate having a central through hole, the silencer being arranged above the gas outlet, where the silencer is fixed to the central through hole and is independent from the scroll assembly.

Based on this scroll compressor, the silencer is fixed to the partition plate instead of the scroll assembly, and is independent from the scroll assembly, so it will not affect the structure of the scroll assembly and can be applied to various types of scroll assemblies; At the same time, the silencer is not only used to eliminate noise, but also seals and isolates the high-pressure chamber from low-pressure chamber of the compressor by virtue of its annular flange together with the partition plate for example, which has the dual functions of silencing and isolating the high-pressure and low-pressure chambers.

Preferably, the silencer may be fixed to the central through hole by welding, interference fit or threaded connection so as to be fixed to the partition plate; or the partition plate may further have a central flange portion extending upward from the periphery of the central through hole, and the silencer may be fixed to the central through hole and the central flange portion by welding, interference fit or threaded connection so as to be fixed to the partition plate. In this way, the silencer is allowed to be conveniently and firmly fixed to the partition plate.

Preferably, the bottom of the silencer may be formed with an external thread on the outer side, and the inner side of the central through hole of the partition plate may be formed with a corresponding internal thread; or, in the case that the partition plate has the central flange portion, the bottom of the silencer may be formed with an internal thread on the inner side, and the outer side of the central flange portion of the partition plate may be formed with a corresponding external thread. In this way, the silencer is allowed to be further conveniently and firmly fixed to the partition plate.

Preferably, the silencer may include a cylindrical body with one or more silencing holes formed in the top and/or side wall of the cylindrical body.

Preferably, the silencer may further include an annular flange extending radially outward along the bottom of the cylindrical body, and the annular flange may abut against the bottom surface or the top surface of the partition plate in the state where the silencer is positioned in place. In this way, the silencer is allowed to be more accurately positioned with respect to the partition plate by means of the annular flange and fixed to the partition plate more reliably.

Preferably, the annular flange may abut against the bottom surface of the partition plate, such that the annular flange may be configured as a sealing plate adapted to engage with a corresponding sealing member to seal and isolate the high-pressure chamber from the low-pressure chamber. In this way, the use of an additional sealing member such as a sealing plate attached to the partition plate is eliminated, so that the silencer can function as sealing and partition in addition to the sound attenuation.

Preferably, the top of the cylindrical body may include multiple silencing holes arranged in an annular form, and/or, the side wall of the cylindrical body may include multiple silencing holes arranged in the circumferential direction.

Preferably, the height of the cylindrical body may range from 20 mm to 40 mm, and/or the radial dimension of the cylindrical body may range from 20 mm to 80 mm.

Through the special design of the number, size and position of the silencing holes and the size of the cylindrical body, the processing of the silencer is easier and the noise reduction effect is good (especially for a specific frequency).

Preferably, the scroll compressor may further include a reed valve arranged at the gas outlet, and the silencer may be arranged to align with the gas outlet to reduce the operating noise of the reed valve. In this way, the silencer can effectively and accurately reduce the noise especially for the operating noise of the reed valve.

Preferably, the scroll assembly may include a recess provided on the side of the non-orbiting scroll facing away from the orbiting scroll, and the scroll compressor may further include a floating seal ring assembly arranged in the recess to define a back pressure chamber.

Preferably, the floating seal ring assembly may have a sealing top end abutting against the annular flange of the silencer to seal and isolate the high-pressure chamber from the low-pressure chamber.

By engaging the annular flange of the silencer with the sealing top end of the floating seal ring assembly, the annular flange of the silencer is advantageously used to simply realize sealing and isolation of the low-pressure chamber from the high-pressure chamber in a case that the floating seal ring assembly for defining the back pressure chamber is provided.

Preferably, the floating seal ring assembly may have a lip extending radially inward from the sealing top end, and the scroll compressor may further include a check valve sheet arranged on the lip to cover the air flow channel at the inner side of the lip.

Preferably, the scroll compressor may further include a stop member accommodated inside the silencer for limiting the upward movement range of the check valve sheet.

By arranging a check valve sheet on the floating seal ring assembly and providing a stop member inside the silencer, the check valve sheet can be used to easily prevent high pressure gas from flowing back in the case that the reed valve is not provided but only the check valve sheet is provided. At the same, the silencer does not interfere with the check valve sheet and the stop member.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The following description of the preferred embodiments is only exemplary, and is by no means a limitation to the present disclosure and its application or usage. The same reference numerals are used in the various drawings to denote the same components, and therefore, the configuration of the same components will not be described repeatedly.

The azimuth terms such as “above”, “upward”, “top” and “bottom” used herein are described for the normal operating arrangement of the vertical scroll compressor. That is, the use of these azimuth terms is only for the purpose of facilitating description, and should not be regarded as restrictive. For example, in the case of a horizontal compressor, “above” may correspond to “left” or “right”.

The structure and operating mode of the scroll compressor and its improved components according to the present disclosure will be described with reference to the accompanying drawings below.

FIG.1first shows one example of a scroll compressor100according to the present disclosure. The scroll compressor100adopts an improved silencing device120and a scroll assembly110thus improved.

A compressor100mainly includes a compressor housing composed of a top cover101, a housing body102and a base103. The space in the compressor housing is divided into a high-pressure chamber104and a low-pressure chamber105. A scroll assembly110is located in the low pressure chamber105, is arranged on a thrust bearing130, and is driven by a main shaft106to compress a gas.

The scroll assembly110mainly includes an orbiting scroll111and a non-orbiting scroll112arranged above the orbiting scroll111in an opposed manner. The gas entering the low-pressure chamber105through an intake port108is sucked into the compression chambers between the orbiting scroll111and the non-orbiting scroll112via the intake port on the outer peripheral wall of the non-orbiting scroll112so as to be compressed, and then discharged through a gas outlet110a. The gas compression chambers are formed by a scroll profile111aof the orbiting scroll111and a scroll profile112aof the non-orbiting scroll112together.

FIGS.2to5show schematic diagrams of two exemplary scroll assemblies110. The scroll assembly110shown inFIGS.2and3is provided with a reed valve (HVE valve)115and a floating seal ring assembly113without a check valve sheet117. The scroll assembly110shown inFIGS.4and5is provided with a floating seal ring assembly113with a check valve sheet117and an additional check valve sheet stop stud118. Due to the use of the newly designed silencing device120, the scroll assembly110according to the present disclosure can use the floating seal ring assembly113with the check valve sheet117, so that the optional type of floating seal ring assembly will not be affected by the silencing device120.

The scroll assembly110inFIGS.2and3is the same as the scroll assembly used in the compressor100ofFIG.1. The gas outlet110ais disposed in the center of the end plate of the orbiting scroll112, an inner hub112bof the orbiting scroll112is formed to extend upward from the end plate around the gas outlet110a, and a reed valve115is arranged inside the inner hub112band is located directly above the gas outlet110a. The floating seal ring assembly113is arranged in a recess on one side of the orbiting scroll112facing away from a non-orbiting scroll111, and is installed in a manner of being set outside the inner hub112bof the orbiting scroll112, thereby defining a back pressure chamber112c. The compressed gas discharged via the gas outlet110apushes up the reed valve115and flows through the upper central opening of the floating seal ring assembly113above the orbiting scroll112so as to be discharged, as shown inFIG.3.

Here, the reed valve115is mainly used to stabilize the pressure of the gas discharged from the gas outlet110ato ensure that the discharged gas has a required sufficient pressure. The floating seal ring assembly113is mainly used to form a back pressure chamber112cabove the orbiting scroll112to always press the orbiting scroll112toward the non-orbiting scroll111.

FIGS.4and5show the scroll assembly110in another embodiment. The difference from the embodiment ofFIGS.2and3is that the scroll assembly110is not provided with a reed valve115, but a check valve sheet117is provided at a lip114aextending radially inward of the sealing top end114of the floating seal ring assembly113, and the check valve sheet117opens or closes in response to the pressure difference between the inner and outer sides thereof. The compressed gas discharged from the gas outlet110aenters the floating seal ring assembly113and then pushes the check valve sheet117at the top so as to be discharged, as shown inFIG.5. At the same time, a check valve sheet limiting stud118which penetrates the check valve sheet117of the floating seal ring assembly113is also provided. The check valve sheet limiting stud118has a rod portion118bserving as a guide section and a stop portion118aextending outwardly formed on the upper part. When the check valve sheet117is pushed up by the pressure below, the check valve sheet117can move along the guide rod portion118b, and the stop portion118aprevents the check valve sheet117from escaping due to excessive exhaust pressure of the high-pressure gas.

The scroll assembly110inFIG.5can be used together with the silencing device120according to the present disclosure without interfering with each other. In contrast, due to the silencer in the existing silencing device being directly installed on the inner hub of the orbiting scroll, the floating seal ring assembly with check valve sheet cannot be used because the silencer will hinder the arrangement of the check valve sheet on the floating seal ring assembly.

The gas discharged from the scroll assembly110enters the silencing device120above (in particular, enters the silencer122of the silencing device120) for noise reduction. The noise-reduced gas enters the high-pressure chamber104after leaving the silencing device120, and then is discharged from the compressor100via the exhaust port107.

FIGS.6and7show a silencing device120according to one embodiment of the present disclosure. The silencing device120according to the present embodiment includes a partition plate121and the silencer122. After the compressed gas enters the silencer122, the noise is attenuated to achieve a noise reduction effect. The partition plate121has an umbrella configuration similar to a “lid”, and extends toward the outside to cover the entire scroll assembly110(as shown inFIG.1). The silencer122is fixed to the center of the partition plate121and located above the gas outlet110aof the scroll assembly110(as shown inFIG.1). After being installed in place, the silencing device120is independent from the scroll assembly110, specifically, the silencer122is independent from the gas compression component formed by the non-orbiting scroll111and the orbiting scroll112or other additional components (such as the floating seal ring assembly113). Here, “independent” represents that the silencer122can be in contact with the components of the scroll assembly110but is not fixed by these components, or can be isolated in space from the scroll assembly110.

Due to such “independent” arrangement, compared with the existing silencer device mentioned in the background, the installation method of the silencer122of the silencer device120according to the present disclosure is more flexible, and various connection manners such as welding connection, interference fit connection, threaded connection can be used to fix the silencer122to the partition plate121. As shown inFIG.7, the partition plate121has a central through hole121bfor fixing the silencer122which is then firmly fixed into the central through hole121bby welding, interference fit connection or threaded connection.

In existing compressors in the background, the orbiting scroll and the non-orbiting scroll are usually made of cast iron, which is not a base material suitable for welding connection, so the silencer is not suitable for fixing to the non-orbiting scroll or the orbiting scroll by welding. Based on the existing silencer arrangement, it is also difficult to adopt interference fit connection. The silencer needs to be interference press-fitted into the inner hub of the orbiting scroll, and if there is a reed valve, the silencer will be installed to be capable of accurately fixing the reed valve. The actual assembly process is difficult and requires a complicated press-fitting apparatus. In addition, additional structures may be required to compensate for component tolerances and accuracy errors, resulting in a complex assembly structure, which is not suitable for practical applications. Although the silencer in the background can be fixed to the orbiting scroll by threaded connection, such manner is not suitable for an orbiting scroll with a thin inner hub, as explained in the background.

The silencer122according to the present disclosure is not directly fixed to the orbiting scroll112but is fixed to the partition plate121. Such arrangement allows the silencer122to be installed by using the above-mentioned multiple connection manners. For the welding connection, by selecting suitable materials with good weldability to make the partition plate121and the silencer122, a good welded joint can be obtained without changing the materials of the non-orbiting scroll and the orbiting scroll. For example, the silencer122may be made of carbon steel, powder metallurgy materials, or metals such as copper, and the partition plate121may be made of carbon steel. For press-fit installation, the process of press-fitting the silencer122into the partition plate121is relatively simple and can be performed independently, and the press-fitting apparatus is simple. For threaded connection, the threaded connection portion can be formed on the partition plate121and the silencer122respectively, and the inner hub112bof the orbiting scroll112does not need to have a large thickness to form the threaded connection portion, so that an orbiting scroll112with an inner hub having thin-wall can be used. In the case of press-fit installation and threaded installation, the partition plate121and the silencer122can also be made of cast iron materials. Although the welding performance is not high, the cast iron materials have excellent castability, workability, and wear resistance and shock absorption, and can provide good mechanical performance for the partition plate121and the silencer122.

The “independent” arrangement of the silencer122according to the present disclosure also allows the position and size of the silencing device120to be flexibly adjusted, allows additional components to be added to the scroll assembly110without interference with the silencing device120, and thus the design of the scroll assembly110is also more flexible.

FIGS.8and9A to9Dspecifically show an exemplary connection manner of the silencer device120according to the present disclosure.FIG.9Ashows a press-fit installation manner,FIGS.9B and9Dshow a welding installation method, andFIG.9Cshows a threaded connection installation manner. In these three connection manners, the silencer122and the partition plate121are connected to each other at an engagement part120a, respectively.FIG.9Bshows a welded joint at the engagement part120a, andFIG.9Cshows the threaded connection portion at the engagement part120a.

Specifically, as best shown inFIG.18, the outer side of the silencer122is formed with external thread122e, and the external thread122eis located at the engagement part120aof the silencer122and the central through hole121bof the partition plate121. The inner side of the central through hole121bof the partition plate121is formed with a corresponding internal thread121i(as shown inFIG.14) so as to be engaged with the external thread122eof the silencer122. As understood by those skilled in the art, compared to welding connection and press-fit connection, threaded connection makes it easier to disassemble and replace components. However, if the airtightness requirements are considered, welding connections and press-fit connections are more advantageous.

In addition, although not shown in the Figures, the partition plate121may also be adopted in other configurations. For example, a flange portion extending upward may be formed at the periphery of the central through hole121bof the partition plate121, and the silencer122may be fixedly connected to the outer side of the flange portion. In addition, it may be considered that the silencer122is directly welded to the periphery of the central through hole121bof the partition plate121without providing a flange portion. In this case, the entire silencer122is located at outer side (upper side) of the partition plate121and is not “inserted” in the partition plate121. However, it is also conceivable that when the partition plate121is provided with a flange portion, the silencer122(not provided with an annular flange) can also be arranged to be inserted only into the inner side of the flange portion or set on the outer side of the flange portion, or the silencer122(with or without an annular flange disposed) may also be arranged to be inserted into both the inner side of the flange portion and the inner side of the central through hole.

FIGS.10to12show illustrations of the silencing device120and the floating seal ring assembly113installed together according to an embodiment of the present disclosure. When the silencing device120is installed in place, the silencer122abuts against the sealing top end114of the floating seal ring assembly113to isolate the high pressure chamber104and the low pressure chamber105of the scroll compressor100from each other.

As shown inFIG.12, the bottom of the silencer122abuts against the sealing top end114of the floating seal ring assembly113and partially covers the inner area of the sealing top end114. Generally, the lateral dimension of the check valve sheet117will be smaller than the uncovered area inside the sealing top end114. To prevent the check valve sheet117from escaping too far away from the floating seal ring assembly113to be reset, a check valve sheet limiting stud118can be provided and a part thereof extending upward is accommodated in the silencer122. The height of the silencer122is designed to provide enough space for accommodating the limiting stud118inside it, and the specific height range will be described below.

In addition, based on the principles of the present disclosure, a simple embodiment without providing the floating seal ring assembly113can also be considered. The silencer122can be arranged to directly abut against the inner hub112bof the orbiting scroll112. In this case, a flexible sealing ring needs to be provided between the annular flange122bof the silencer122(as shown inFIG.15A) and the inner hub112bof the orbiting scroll112so as to achieve sealing on the one hand and ensure that the gas discharged from the gas outlet110asmoothly enters the silencer122and on the other hand, to prevent the vibration, such as of the scroll assembly from being transmitted to the partition plate121and the compressor housing. Based on this arrangement, the overall height of the silencing device120can also be reduced.

FIGS.13and14show schematic diagrams of the partition plate121according to an embodiment of the present disclosure. The structure of the partition plate121of the silencing device120according to the present disclosure is designed to facilitate the installation of the silencer122, while it is able to accommodate and cover other components of the scroll assembly below. As shown in the Figures, the partition plate121mainly includes an umbrella body121d, a cylindrical portion121c, and a ring attachment portion121e.

A central through hole121bfor mounting the silencer122is formed in the center of the umbrella body121d, and the umbrella body121dexpands and extends outward from the central through hole121bso as to cover the scroll assembly110below. Specifically, the umbrella body121dis composed of a horizontal section121hextending from the central through hole121band an inclined section121fextending from the horizontal section121h, and a protruding arc portion121gmay be provided between the horizontal section121hand the inclined section121fto improve the structure strength of the umbrella body121d. The “umbrella” structure of the umbrella body121dcan provide a more stable installation platform for the silencer122, and at the same time leave enough accommodating space for the high-pressure chamber104above for accommodating additional components.

The cylindrical portion121cextends substantially vertically downward from the periphery of the umbrella body121dto form a joint area for joining an external structure (such as the compressor housing). After being installed in place, the cylindrical portion121ccan follow the inner wall of the compressor housing.

The annular attachment portion121eis formed to extend radially outward around the cylindrical portion121c, for example, it may be formed as an annular lip for engaging the compressor housing. The partition plate121is attached to the joint position of a top cover101and a housing body102by represents of a ring attachment portion121e, and then is fixed by welding or the like. The provision of the cylindrical portion121cand the annular attachment portion121ehelps the partition plate121to be more securely installed to external components (the improved structure strength of the partition plate121itself and the stable installation of the partition plate121and external components also avoid the excessive shock of the partition plate and further of the compressor housing in the case that the silencing device120is installed on the partition plate), and provides a better sealing effect, but its specific structure is not limited to the form shown in the drawings, any structure suitable for fixing and installing the partition plate121is feasible. Thus, the partition plate121is not only used to install the silencer122, but also can seal and separate the high-pressure chamber104from the low-pressure chamber105together with the silencer122(by represents of the annular flange of the silencer122used as a sealing plate). The silencing cover (partition plate) of the existing silencing device must be combined with an additional specially designed sealing seat component to achieve the effect of sealing and separating the high-pressure chamber from the low-pressure chamber.

The partition plate121also includes a boss portion121aformed on the umbrella body121d, and the boss portion121aprovides an extra accommodation space inside the umbrella body121dfor accommodating additional devices on the scroll assembly110, such as the additional jet port109shown inFIG.1. The form of the boss portion121ais not limited to the “stepped” structure shown in the figure, and can be adjusted according to the shape of the additional device that needs to be accommodated in practice.

FIGS.15A to17Cshow multiple embodiments of the silencer122according to the present disclosure. In the figures, the configuration of the silencer122is shown to be substantially the same, and the difference lies in the position, number and aperture of the silencing hole122aof the silencer122and the height and radial dimensions of the body part of the silencing device120.

In the example shown in the figures, the silencer122includes a cylindrical body122cand an annular flange122bformed around the bottom of the cylindrical body122c. Multiple silencing holes122aare formed in the top and/or side walls of the cylindrical body122c, and the noise will be significantly reduced when the compressed gas is discharged through the silencing holes122a. After being installed in place, the cylindrical body122cof the silencing device120protrudes into the high-pressure chamber104, and discharges the compressed gas into the high-pressure chamber104while reducing noise.

The annular flange122bis used to define the installation position of the silencer122relative to the partition plate121. In the installed state, the annular flange122bis arranged to abut against the bottom wall surface of the partition plate121, as clearly shown inFIGS.9A to9C. Thus, the annular flange122bcan serve as a sealing surface for sealing the peripheral gap of the central through hole121bof the partition plate121(used as a sealing plate suitable for engaging with the corresponding sealing member, such as the sealing top of the floating seal ring assembly), thereby sealing and separating the high pressure chamber104and the low pressure chamber105together with the partition plate121. Therefore, the silencer122according to the present disclosure has both the function of silencing and the function of sealing and separating the high-pressure chamber104from the low-pressure chamber105. The sealing and separating function also ensures that the sound energy of the gas discharged from the gas outlet110ais transmitted to the silencer122, but not transmitted to the partition plate121and the compressor housing.

Advantageously, the top edge of the cylindrical body122cof the silencer122is chamfered or rounded to eliminate sharp edges.

By adjusting the height and radial size of the cylindrical body122c, the number, aperture, and position of the silencing holes122a, different silencing effects can be obtained, and in particular, different silencing holes arrangements can be designed for a certain specific frequency of noise, and the like, and thus the silencer according to the present disclosure can achieve a good noise reduction effect for a certain frequency (for example, the frequency related to the noise caused by the reed valve).

The top of the cylindrical body122cshown inFIGS.15A to15Cis formed with 6 holes with a diameter of ø8 mm, and the top of the cylindrical body122cshown inFIGS.16A to16Cis formed with 24 holes with a diameter of ø4 mm. In the example ofFIGS.17A to17C, a series of silencing holes122aare formed around the side wall of the cylindrical body122cof the silencer122, for example, which may be 24 holes with a diameter of ø4 mm or 6 holes with a diameter of 08 mm.

According to the principle of the present disclosure, when the total channel area of the holes on the silencer122is constant, the size of the silencing holes122adecreases and the number thereof increases accordingly. The silencing effect of multiple silencing holes122awith small-aperture is better than the silencing effect of a small amount of silencing holes122awith large-aperture. Therefore, in the above example, the silencing effect of the 24 silencing holes122awith a diameter of ø4 mm is better than that of the 6 silencing holes122awith a diameter of ø8 mm. At the same time, too many silencing holes of reduced size will increase the processing cost. According to the present disclosure, after comprehensively considering the above factors, a silencer that is easier to process and has a good noise reduction effect (especially a good reduction effect for noise with a certain specific frequency) is designed.

The height and radial size of the silencer122also affect the silencing effect. The cylindrical body122cof the silencer122according to the present disclosure may have a height in the range of 20 mm to 40 mm, and a radial dimension (for example, the diameter of the cylinder) in the range of 20 mm to 80 mm. The height and radial size of the silencer122are positively correlated with the silencing effect, that is, as the height and/or outer diameter size increases, the silencing effect is optimized. The height and radial dimension can be selected based on the displacement size of the scroll assembly110, the dimension (height, outer diameter) of the partition plate121, and the desired silencing effect (for example, silencing for noise in a certain specific frequency band).

According to the principles of the present disclosure, the silencing process of the silencer122follows the following sound energy transmission loss formula:

In the formula above, “TL” represents sound energy transmission loss, “W” represents sound power, “P” represents sound pressure, “A” represents flow area, the subfix “in” represents the silencer entrance, and the subfix “out” represents the silencer exit, that is the silencing holes.

FIG.19shows the sound energy transmission loss simulation calculation curve of the silencing device120according to the present disclosure which is obtained based on this formula. It can be seen from the figure that the specially designed silencing device120according to the present disclosure has a significant reduction effect on the noise in the 3000 Hz˜3500 Hz frequency band.

In addition to simulating the noise reduction effect, the applicant has also conducted experimental assembly and calibration operating point noise tests on various compressor models to verify the actual noise reduction effect of the silencing device120according to the present disclosure. The test conditions used are shown in Table 1 and Table 2 below.

Note: 41F in the above tables represents the saturated evaporation temperature of the compressor working fluid (for example, refrigerant), and 131F represents the saturated condensation temperature of the compressor working fluid.

The test results are shown in the graphs inFIG.20A(for Table 1) andFIG.20B(for Table 2). The actual measurement results show that the overall operating noise of the compressor has been reduced by about 4˜5 dB(A) (“A” here represents that the noise test is weighted by A-level), especially in the desired noise reduction frequency band near 3150 Hz, the noise reduction effect is obvious (the noise source of this frequency band is mainly caused by the reed valve tapping), with a noise reduction of about 10 dB(A) and a significant improvement in the actual listening experience.

In general, the silencing device120according to the present disclosure can provide the beneficial effects as follows:1. The silencer122of the silencing device120is directly assembled to the partition plate121and is independent from the scroll assembly110. Therefore: the size design and layout are more flexible and can be adjusted according to the structure of the scroll assembly110; the structure of the scroll assembly110is not limited, for example, which eliminates the limits on the type of floating seal ring assembly and the wall thickness of inner hub of the scroll; the assembly process is simplified.2. The annular flange122bof the silencer122is suitable for abutting against the partition plate121, and also suitable for abutting against such as the sealing top end114of the floating seal ring assembly113to seal and isolate the high-pressure chamber from the low-pressure chamber, such that all the discharged compression gas is introduced into the silencer122to avoid the noise sound energy to be transmitted to the partition plate121and the compressor housing. Therefore, the silencer122has both the function of silencing and isolating the high pressure chamber from the low pressure chamber.3. Through experiments, it is found that the actual noise reduction effect of the silencing device120is positively correlated with the simulated noise reduction effect, which proves that the silencer122can achieve accurate and effective reduction for noise with a certain specific frequency by changing the dimension parameters of the silencing hole and the cylindrical body.

Although various embodiments of the present disclosure have been described in detail herein, it should be understood that the present disclosure is not limited to the detailed embodiments described and shown in detail here, and other variations and variants can be achieved by those skilled in the art without departing from the essence and scope of the present disclosure. All these variations and variants fall within the scope of the present disclosure. Moreover, all the members described herein can be replaced by other technically equivalent members.