compressor

Abstract

The present invention relates to a compressor including a compression mechanism adapted to compress a fluid and a sound deadening partition for partitioning an internal space of the compressor into a high-pressure side and a low-pressure side, the sound deadening partition including a mounting hole and an insert mounted in the mounting hole, the fluid compressed by the compression mechanism being discharged to the high-pressure side via a passage of the insert and then to the outside of the compressor, the insert having an interference fit with the mounting hole and having an interference fit portion, and a protruding section protruding toward the high-pressure side direction with respect to the remaining portion of the sound deadening partition being provided at a portion of the sound deadening partition adjacent to the interference fit portion. The present invention provides a compressor improved in sound deadening configuration and safety reliability.

Description

Technical Field

[0001] This invention relates to compressors, and more particularly, to compressors with improvements in noise reduction construction and safety and reliability. Background Technology

[0002] The content in this section only provides background information related to this invention and may not constitute prior art.

[0003] In the field of compressors, scroll compressors, for example, belong to positive displacement compression machinery. The compression mechanism of a scroll compressor typically includes a stationary scroll component and a moving scroll component. The blades of the stationary and moving scroll components mesh with each other to compress the working fluid (e.g., refrigerant). Generally, after the working fluid is introduced into the compression mechanism through the suction port, the compression of the working fluid is achieved by the movement of the stationary and moving scroll components, and the compressed high-pressure gas is discharged through the discharge port.

[0004] The compressor also includes a partition that divides the internal space of the compressor into a high-pressure side and a low-pressure side. Typically, an insert is disposed in a through-hole of the partition. Fluid compressed by the compression mechanism is discharged through the passage of this insert to the high-pressure side (discharge space) and then to the outside of the compressor. In this silencing structure, the insert is interference-fitted with the through-hole of the partition to generate a holding force to overcome the closing force (i.e., the gas force borne by the insert based on the pressure difference between the high-pressure and low-pressure sides). The pressure difference between the high-pressure and low-pressure sides tends to exert a downward force on the insert, causing the interference-fitted through-hole portion of the partition to enlarge. This results in a decrease in the holding force on the insert as the pressure difference increases, reducing the partition's holding safety factor (holding force / closing force) and the compressor's operational reliability. The silencing partition holding safety factor of the compressor's silencing structure in the prior art is low and typically lower than the production safety silencing partition holding safety factor of 1.8.

[0005] Furthermore, the silencing structure of compressors in related technologies aims to increase the holding force by increasing the interference fit between the insert and the partition. However, this is limited by the yield strength of the partition and also increases the risk of compressor failure.

[0006] Therefore, there is a need for further improvements in the noise reduction structure and safety and reliability of existing compressors. Summary of the Invention

[0007] The present invention provides a compressor with improved noise reduction structure and safety reliability by providing a protruding section at the adjacent portion of the interference fit between the insert of the noise reduction baffle and the mounting hole.

[0008] The present invention provides a compressor comprising a compression mechanism adapted to compress a fluid and a sound-absorbing baffle for dividing the internal space of the compressor into a high-pressure side and a low-pressure side. The sound-absorbing baffle includes a mounting hole and an insert mounted in the mounting hole. Fluid compressed by the compression mechanism is discharged to the high-pressure side and then to the outside of the compressor via a channel of the insert. The insert is interference-fitted with the mounting hole and has an interference fit portion. Furthermore, a protruding section protruding toward the high-pressure side relative to the rest of the sound-absorbing baffle is provided at a portion of the sound-absorbing baffle adjacent to the interference fit portion.

[0009] Advantageously, the mounting hole is located at the protruding section.

[0010] Advantageously, the sound-absorbing baffle is generally truncated conical in shape, the mounting hole is located in the center of the sound-absorbing baffle, and the sound-absorbing baffle also includes a main inclined section.

[0011] Advantageously, the taper angle α of the main inclined section is greater than 10° and less than 60°.

[0012] Advantageously, the sound-absorbing baffle also includes a transition arc portion between the main inclined section and the protruding section, the protruding section protruding relative to the transition arc portion toward the high-voltage side, thereby having a protrusion height H originating from the tangent of the transition arc portion.

[0013] Advantageously, the protruding section is connected to the main inclined section, the protruding section including a protruding inclined portion inclined at a larger taper angle connected to the main inclined section and a protruding horizontal portion extending substantially horizontally from the protruding inclined portion, thereby having a protruding height H starting from the connection point of the protruding section and the main inclined section.

[0014] Advantageously, the protrusion height H is greater than 1 mm, and / or the protrusion height H is less than 5 times the thickness T of the sound-absorbing baffle.

[0015] Advantageously, the protruding segments are constructed as multiple connected segments, thus forming a multi-step shape.

[0016] Advantageously, the mounting hole is a circular hole with a diameter D greater than 50 mm.

[0017] Advantageously, the insert is cylindrical and has a bottom wall with a through hole to allow fluid to be discharged through the insert to the high-pressure side, and a check valve is provided at the insert for selectively opening and closing the through hole.

[0018] Advantageously, the sound-absorbing baffle and the insert are constructed and fitted such that the retention safety factor of the insert relative to the sound-absorbing baffle is greater than 2.0.

[0019] Advantageously, the compressor is a variable frequency scroll compressor.

[0020] Therefore, compared with the prior art, the present invention provides a compressor with improvements in noise reduction structure and safety reliability. Attached Figure Description

[0021] The features and advantages of embodiments of the present invention will become more readily understood from the following description with reference to the accompanying drawings, in which:

[0022] Figure 1 A longitudinal cross-sectional view of a scroll compressor of the related art is shown, which illustrates the interference fit insert and the noise-reducing baffle.

[0023] Figure 2 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a scroll compressor according to a first embodiment of the present invention is shown, wherein the noise-reducing baffle has a protruding section near the interference fit between the noise-reducing baffle and the insert, and the noise-reducing baffle also has a main inclined section and a transition arc section.

[0024] Figure 3 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a scroll compressor according to a second embodiment of the present invention is shown, wherein the noise-reducing baffle has a protruding section near the interference fit between the noise-reducing baffle and the insert, and the noise-reducing baffle also has a main inclined section but no transition arc section.

[0025] Figure 4 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a modified scroll compressor according to a first embodiment of the present invention is shown, wherein the protruding sections are implemented in multiple steps.

[0026] Figure 5 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a modified scroll compressor according to a second embodiment of the present invention is shown, wherein the protruding sections are implemented in multiple steps. Detailed Implementation

[0027] The following description of preferred embodiments is merely exemplary and is by no means a limitation of the invention or its application or use. The same or similar reference numerals are used in the various figures to denote the same parts, therefore the construction of the same parts will not be described again.

[0028] The following will refer to Figure 1In describing the basic structure and principle of the scroll compressor 10, it should be understood that the silencing structure according to the invention is also applicable to other types of compressors.

[0029] like Figure 1 As shown, the scroll compressor 10 includes a generally cylindrical housing 12, a top cover 14 disposed at one end of the housing 12, and a bottom cover 16 disposed at the other end of the housing 12. The cylindrical housing 12, the top cover 14, and the bottom cover 16 form the outer casing of the scroll compressor 10. It should be understood that the outer casing of the scroll compressor 10 can vary depending on the specific application; for example, it can be a closed type or a semi-closed type (e.g., omitting the bottom cover 16).

[0030] Inside the casing of the scroll compressor (also referred to simply as "compressor") 10, a partition 15 is provided, particularly between the top cover 14 and the housing 12, to divide the internal space of the compressor into a high-pressure side and a low-pressure side. The partition 15 and the top cover 14 constitute the high-pressure side, while the partition 15, the housing 12, and the bottom cover 16 constitute the low-pressure side. An inlet port (not shown) for drawing in working fluid (e.g., refrigerant) is provided on the low-pressure side, and an outlet port for discharging the compressed working fluid is provided on the high-pressure side. During compressor operation, the low-temperature, low-pressure working fluid enters the low-pressure side of the compressor 10 via the inlet port, is compressed into a high-temperature, high-pressure working fluid, and is discharged to the high-pressure side, and then discharged from the compressor 10 via the outlet port.

[0031] A motor 20, a rotating shaft 30, and a compression mechanism are disposed within the housing of the compressor 10. The motor 20 consists of a stator and a rotor and is configured to drive the rotating shaft 30 to rotate. The rotating shaft 30 is fixedly connected to the rotor of the motor 20. The compression mechanism includes a fixed scroll member 80 and a moving scroll member 70. The rotating shaft 30 is configured to drive the moving scroll member 70 to move relative to the fixed scroll member 80.

[0032] The compressor 10 also includes a main bearing housing 40. The main bearing housing 40 is fixedly connected to and located within the cylindrical housing 12. The main bearing housing 40 is configured (e.g., via a thrust plate) to support the compression mechanism, specifically the moving scroll member 70. The rotating shaft 30 is rotatably supported by a main bearing disposed in the main bearing housing 40. A lubricating oil passage is provided in the rotating shaft 30 to supply lubricating oil from the bottom cover 16 to the various bearings and other moving parts of the compressor 10.

[0033] The moving scroll member 70 includes an end plate 72, a hub 74 formed on one side of the end plate, and helical blades 76 formed on the other side of the end plate. The stationary scroll member 80 includes an end plate 82, helical blades 86 formed on one side of the end plate, and a discharge port 88 formed at approximately the center of the end plate. The discharge port 88 communicates with an upwardly opening recess 89, which in turn communicates with a discharge space (high-pressure side) 90 defined by a top cover 14 and a partition 15. An annular recess 92 is formed in the stationary scroll member 80. A floating sealing assembly is arranged within this recess 92. The recesses 89 and 92, together with the floating sealing assembly, define an axial pressure bias chamber that receives pressurized fluid compressed by the blades 76 and 86 to apply an axial bias force to the stationary scroll member 80, thereby forcing the tips of each blade 76 and 86 to form a sealing engagement with the opposing end plate surfaces of the end plates 72 and 82, respectively.

[0034] Between the helical blades 86 of the fixed vortex component 80 and the helical blades 76 of the moving vortex component 70, a series of compression chambers are formed, with their volumes gradually decreasing from the radially outer side to the radially inner side. The outermost compression chamber is at the intake pressure, and the innermost compression chamber is at the exhaust pressure. The middle compression chamber is located between the intake pressure and the exhaust pressure, and is therefore also called the intermediate pressure chamber.

[0035] An eccentric crank pin 36 is provided at one end of the rotating shaft 30. The eccentric crank pin 36 is fitted inside the hub 74 of the moving scroll component 70. An unloading bushing may be provided between the eccentric crank pin 36 and the hub 74 of the moving scroll component 70. When the motor 20 starts, the eccentric crank pin 36 of the rotating shaft 30 drives the hub 74 of the moving scroll component 70, so that the moving scroll component 70 can rotate relative to the fixed scroll component 80 in a translational motion (that is, the central axis of the moving scroll component 70 moves about the central axis of the fixed scroll component 80, but the moving scroll component 70 itself does not rotate about its own central axis) to achieve compression of the working fluid in a series of compression chambers. The aforementioned translational rotation is achieved by a cross-shaped slip ring (not shown) provided between the fixed scroll component 70 and the moving scroll component 80.

[0036] Next, we will continue to combine Figure 1The silencing structure of the compressor is described. The compressor silencing structure may include a baffle 15 and an insert 200 mounted in the baffle. Fluid compressed by the compression mechanism (fixed scroll member and moving scroll member) is discharged through a channel in the insert 200 to the high-pressure side 90 and then to the outside of the compressor. The insert 200 is installed in a through-hole of the baffle 15 and is interference-fitted to the through-hole to generate a retaining force to overcome the downward gas force exerted on the insert based on the pressure difference between the high-pressure and low-pressure sides. A disadvantage of this silencing structure is that, because the pressure difference between the high-pressure and low-pressure sides tends to exert a downward force on the insert (and the valve member mounted on the insert), the portion of the through-hole in the baffle 15 that is interference-fitted with the insert 200 enlarges. This causes the retaining force on the insert 200 to decrease as the pressure difference increases, reducing the safety factor of the silencing baffle and the operational reliability of the compressor.

[0037] Now combine Figure 2 The silencing structure of the scroll compressor according to an embodiment of the present invention is described, and other parts having the same markings refer to the same parts.

[0038] Figure 2 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a scroll compressor according to a first embodiment of the present invention is shown, wherein the noise-reducing baffle has a protrusion near the interference fit between the noise-reducing baffle and the insert, and the noise-reducing baffle also has a main inclined section and a transition arc section. Figure 2 According to the present invention, the silencer 150 of the scroll compressor is used to divide the internal space of the compressor into a high-pressure side and a low-pressure side. The silencer 150 includes a mounting hole 151 and an insert 152 mounted in the mounting hole. Fluid compressed by the compression mechanism is discharged to the high-pressure side and then to the outside of the compressor through the channel of the insert 152. The insert 152 is interference-fitted with the mounting hole 151 and has an interference fit portion. Furthermore, a protruding section 153 protruding toward the high-pressure side relative to the rest of the silencer 150 is provided at the portion of the silencer 150 adjacent to the interference fit portion. The mounting hole 151 may be provided at the protruding section 153.

[0039] According to the present invention, a protruding section is provided at the adjacent portion of the interference fit between the insert and the mounting hole of the above-mentioned sound-absorbing baffle, which protrudes toward the high-pressure side relative to the rest portion. As the pressure difference increases, the mounting hole portion contracts, thereby increasing the holding force on the insert as the pressure difference increases, improving the safety factor of the sound-absorbing baffle and the operational safety and reliability of the compressor.

[0040] See also Figure 2The specific structure of the sound-absorbing baffle is described. The sound-absorbing baffle 150 can be in the shape of a roughly truncated conical cylinder. The mounting hole 151 can be set in the center of the sound-absorbing baffle. The sound-absorbing baffle also includes a main inclined section 154 and a transition arc section 155 between the main inclined section 154 and the protruding section 153. The protruding section 153 protrudes toward the high-voltage side relative to the transition arc section 155, thereby having a protrusion height H starting from the tangent of the transition arc section.

[0041] In one aspect of this embodiment, the protrusion height H can be greater than 1 mm, and / or the protrusion height H can be less than 5 times the thickness T of the sound-absorbing baffle. Advantageously, the thickness T can be selected as the thickness at the transition arc portion or the average thickness of the sound-absorbing baffle.

[0042] The mounting hole 151 can be circular. Generally, for example, when the compressor is operating at a large displacement, a larger diameter of the circular hole can help reduce the exhaust pressure differential to meet the stability and safety requirements of the compression system. However, a larger diameter of the circular hole may lead to a decrease in the safety factor of the silencing structure because, with a larger diameter, the area difference between the high and low pressure differentials is larger, resulting in a greater downward gas force on, for example, the insert, causing the insert to loosen. To address this, the technical solution of the present invention, including the "protrusion" feature, can achieve a balance between these two aspects, that is, while ensuring the specified safety factor of the silencing structure, it can reduce the exhaust pressure differential to meet the system stability and safety requirements with a larger range of circular hole diameters. In one aspect of the embodiment, the diameter D of the circular hole can be greater than 66 mm; in another aspect, the diameter D of the circular hole can be greater than 50 mm.

[0043] In one aspect of this embodiment, the taper angle α of the main inclined segment 154 can be greater than 10° and less than 60°.

[0044] In an advantageous aspect of the first embodiment of the invention, the protruding segments can be constructed as a plurality of connected segments, thereby forming a multi-step shape. Figure 4 A longitudinal cross-sectional view of a noise-absorbing baffle and related components of a variant scroll compressor according to a first embodiment of the present invention is shown, wherein the protruding segments 153 of the noise-absorbing baffle 150” can be constructed as a plurality of connected segments to form a multi-step shape.

[0045] In terms of spatial design, designing a larger starting angle for the sound-absorbing baffle can reduce the welding stress between the sound-absorbing baffle and the top cover or shell. However, if the angle is too large, it will result in a large gap between the sound-absorbing baffle and the compression mechanism (dynamic vortex and static vortex), thus wasting space. However, according to the present invention, the multi-step protrusion section can achieve a large starting angle of the sound-absorbing baffle relative to the shell without causing a large gap between the sound-absorbing baffle and the compression mechanism.

[0046] Next, combine Figure 3 The noise reduction structure of a scroll compressor according to another embodiment of the present invention will be described. Figure 3 A longitudinal cross-sectional view of a noise-absorbing baffle and related components of a scroll compressor according to a second embodiment of the present invention is shown. The noise-absorbing baffle 150' has a protruding section near the interference fit between the baffle and the insert, and also has a main inclined section. However, unlike the first embodiment, the noise-absorbing baffle of the second embodiment does not have a transition arc portion. Viewed in the longitudinal cross-section of the compressor, the protruding section 153 is connected to the main inclined section 154. The protruding section 153 includes a protruding inclined portion 153a inclined at a larger taper angle connected to the main inclined section 154, and a protruding horizontal portion 153b extending substantially horizontally from the protruding inclined portion, thus having a protrusion height H starting from the connection point between the protruding section 153 and the main inclined section 154. In one aspect, this protrusion height H may be greater than 1 mm, and / or, the protrusion height H is less than 5 times the thickness T of the noise-absorbing baffle.

[0047] In an advantageous aspect of the second embodiment of the invention, the protruding segments can be constructed as a plurality of connected segments, thereby forming a multi-step shape. Figure 5 A longitudinal cross-sectional view of a noise-reducing baffle and related components of a modified scroll compressor according to a second embodiment of the present invention is shown, wherein the raised sections 153 of the noise-reducing baffle 150”’ can be constructed as a plurality of connected sections, thus forming a multi-step shape. Similar to the embodiments described above, the multi-step raised sections according to the present invention achieve a large starting angle of the noise-reducing baffle relative to the housing without resulting in a large gap between the noise-reducing baffle and the compression mechanism.

[0048] According to one aspect of an embodiment of the present invention, see Figure 2 and Figure 3The insert 152 may be cylindrical and have a bottom wall with a through-hole to allow fluid to drain through the insert to the high-pressure side. A check valve 160 is provided at the insert 152 for selectively opening and closing the through-hole. Generally, when a check valve is provided in the insert, especially when the check valve is closed, it may lead to a decrease in the safety factor of the silencing structure because the area difference between the high and low pressure differentials is larger when the check valve is closed, resulting in a greater downward gas force on, for example, the insert, causing the insert to loosen. To address this, the technical solution of the present invention, including the "protrusion" feature, allows for the application of a check valve that performs on / off functions while ensuring a specified safety factor for the silencing structure. The closing force can then be the gas force borne by the insert and check valve as a whole, based on the pressure difference between the high-pressure and low-pressure sides. In other words, the retention safety factor of the silencing baffle can be the ratio of the retention force to the gas force borne by the insert and check valve as a whole, based on the pressure difference between the high-pressure and low-pressure sides.

[0049] Advantageously, while the safety factor for maintaining a sound-absorbing baffle is typically 1.1 in the prior art, the sound-absorbing baffle and insert according to the invention can be constructed and fitted such that (e.g., under the condition of maximum pressure difference between the low-pressure chamber and the high-pressure chamber, and with the stress of the sound-absorbing baffle below the yield strength of 314 MPa) the safety factor for maintaining the insert relative to the sound-absorbing baffle is greater than 2.0. In one embodiment, this safety factor can be 2.2.

[0050] In another advantageous aspect of an embodiment of the invention, the compressor may be a variable frequency scroll compressor.

[0051] Although preferred embodiments of the invention have been described in detail herein, it should be understood that the invention is not limited to the specific structures described and shown herein, and other modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the invention. All such modifications and variations fall within the scope of the claims of this invention.

Claims

1. A compressor (10) comprising a compression mechanism adapted to compress a fluid and a sound deadening partition (150, 150', 150", 150"') for partitioning an internal space of the compressor into a high pressure side and a low pressure side, the sound deadening partition comprising a mounting hole (151) and an insert (152) mounted in the mounting hole, the fluid compressed by the compression mechanism being discharged to the high pressure side and further to an outside of the compressor via a passage of the insert, characterized in that the insert has an interference fit with the mounting hole and has an interference fit portion, and a raised section (153) projecting toward the high pressure side direction relative to a remaining portion of the sound deadening partition is provided at a portion of the sound deadening partition adjacent to the interference fit portion.

2. The compressor (10) of claim 1, wherein, the mounting hole (151) is provided at the raised section (153).

3. The compressor (10) of claim 1, wherein, the sound deadening partition (150, 150') is generally frustoconical cylindrical, the mounting hole is provided at a center of the sound deadening partition, and the sound deadening partition further comprises a main inclined section (154).

4. The compressor (10) of claim 3, wherein, a taper angle a of the main inclined section is greater than 10° and less than 60°.

5. The compressor (10) of claim 3, wherein, the sound deadening partition further comprises a transition circular arc portion (155) between the main inclined section (154) and the raised section (153), the raised section projects toward the high pressure side direction relative to the transition circular arc portion, thereby having a projection height H from a tangent of the transition circular arc portion.

6. The compressor (10) of claim 3, wherein, the raised section (153) is continuous with the main inclined section (154), the raised section (153) comprises a raised inclined portion (153a) inclined at a greater taper angle continuous with the main inclined section and a raised horizontal portion (153b) extending generally horizontally from the raised inclined portion, thereby having the projection height H from a point of continuity of the raised section with the main inclined section.

7. The compressor (10) of claim 5 or 6, wherein, the projection height H is greater than 1 mm and / or the projection height H is less than 5 times a thickness T of the sound deadening partition.

8. The compressor (10) of claim 5 or 6, wherein, the raised section (153) is configured as a plurality of sections continuous with one another so as to be multi-stepped.

9. The compressor (10) according to any one of claims 1 to 6, wherein, the mounting hole is a circular hole, a diameter D of the circular hole is greater than 50 mm.

10. The compressor (10) according to any one of claims 1 to 6, wherein, the insert is cylindrical and has a bottom wall, the bottom wall has a through hole to allow the fluid to be discharged to the high pressure side via the insert, and a check valve (160) for selectively opening and closing the through hole is provided at the insert.

11. The compressor (10) according to any one of claims 1 to 6, wherein, the sound deadening partition and the insert are configured and fitted so that a safety factor of retention of the insert relative to the sound deadening partition is greater than 2.

0.

12. The compressor (10) of any one of claims 1 to 6, wherein, the compressor is a variable frequency scroll compressor.

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