Scroll compressor

Abstract

A scroll compressor, comprising a housing (21), a compression assembly (22), and a damping mechanism (23). The compression assembly (22) is disposed in an inner cavity of the housing (21), and the compression assembly (22) comprises: an upper frame (221); a static scroll (222), fixedly connected to the upper frame (221); an orbiting scroll (223), rotatably connected to the upper frame (221) and engaging with the static scroll (222) to form a compression cavity; a drive apparatus (224), comprising a motor (2241) and a crankshaft (2242), a first end of the crankshaft (2242) being connected to the orbiting scroll (223), and the motor (2241) being used to drive the crankshaft (2242) to rotate, so as to drive the movable scroll (223) to move; a lower frame (225) a second end of the crankshaft (2242) being connected to the lower frame (225) by means of a bearing assembly (226); a connecting sleeve (227), fixedly connected to the upper frame (221) and the lower frame (225) and fixedly connected to the motor (2241). The damping mechanism (23) is disposed between the compression assembly (22) and the housing (21), and is used to reduce the vibration of the compression assembly (22), so as to reduce noise.

Description

scroll compressor Technical Field

[0001] The present application relates to the technical field of compressors, and more specifically, to a scroll compressor. Background Art

[0002] The noise level of the compressor will directly affect the noise level of the air conditioner, heat pump or refrigeration unit in which the compressor is used. Especially in the era of ESG energy conservation, variable frequency units and variable frequency compressors are becoming more and more important, and there is a demand for expansion to higher speeds, but the noise of variable frequency compressors at high speeds is often relatively high. This is because in the relevant technology, the frame and motor stator and other components in the scroll compressor are often fixed in the casing by interference fit. During the high-speed operation of the compressor, the movable scroll, bearings, crankshaft, motor and other components in the compressor will vibrate, and these vibrations are transmitted to the casing through the above-mentioned interference fit to form a large noise.

[0003] Summary of the Invention

[0004] The present application provides a scroll compressor, comprising a shell, a compression assembly and a shock-absorbing mechanism, wherein the compression assembly is arranged in an inner cavity of the shell, and the compression assembly comprises: an upper frame; a fixed scroll fixedly connected to the upper frame; a movable scroll rotatably connected to the upper frame and engaged with the fixed scroll to form a compression chamber; a driving device, comprising a motor and a crankshaft, a first end of the crankshaft being connected to the movable scroll, and the motor being used to drive the crankshaft to rotate so as to drive the movable scroll to move; a lower frame, a second end of the crankshaft being connected to the lower frame through a bearing assembly; a connecting sleeve fixedly connected to the upper frame and the lower frame, and fixedly connected to the motor; the shock-absorbing mechanism is arranged between the compression assembly and the shell, and is used to reduce the vibration of the scroll compressor.

[0005] Optionally, the shell includes an upper shell, an intermediate shell and a lower shell; the shock absorbing mechanism includes at least one elastic shock absorbing unit, and the at least one elastic shock absorbing unit is arranged between the compression assembly and the lower shell.

[0006] Optionally, the elastic shock absorbing unit is a buffer spring, a spring damper, or a rubber shock absorber.

[0007] Optionally, the upper shell includes a top cover and an inner cover, and the top cover, the inner cover and the static scroll together form a discharge chamber of the scroll compressor; and the shock absorbing mechanism includes a sealing ring, which is arranged between the static scroll and the inner cover, and is used to seal the gap between the discharge chamber and the static scroll when the compression assembly vibrates.

[0008] Optionally, the sealing ring adopts a radial sealing method.

[0009] Optionally, the static scroll is connected to the upper frame via threaded fasteners.

[0010] Optionally, the upper frame and the connecting sleeve are connected by one of the following methods: interference connection, welding, threaded connection and threaded fastener connection.

[0011] Optionally, the lower frame is connected to the connecting sleeve by one of the following methods: interference connection, welding, threaded connection and threaded fastener connection.

[0012] Optionally, the connection manner between the connecting sleeve and the motor is any one of the following: interference connection, welding, threaded connection and threaded fastener connection.

[0013] Optionally, the scroll compressor is a variable frequency scroll compressor.

[0014] The technical solution provided in the embodiment of the present application uses a connecting sleeve to connect the various components in the compression assembly, eliminating the interference connection between the frame, motor, bearing and other components and the shell in the existing solution, so that all vibration sources in the scroll compressor are connected through the shock-absorbing mechanism. When the compressor is running, the vibration generated by the movement of each component and the compression of the gas is alleviated by the shock-absorbing mechanism and the remaining vibration is transmitted to the shell. In this way, the noise during the operation of the compressor can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG. 1 is a schematic structural diagram of a scroll compressor in the related art.

[0016] FIG2 is a schematic structural diagram of a scroll compressor provided in an embodiment of the present application. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0018] In addition, in order to better illustrate the present application, numerous specific details are provided in the following detailed description. Those skilled in the art will understand that the present application can be practiced without certain specific details. In some examples, methods and means well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0020] In addition, if the terms "first", "second", etc. appear, they are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0021] A scroll compressor is a positive displacement compressor with a unidirectional, continuous compression process. It boasts high volumetric efficiency and reliability, making it widely used in heat pumps and air conditioners. The operating principle of a scroll compressor is to compress the gas by causing the orbiting scroll to perform non-rotating translational motion around the center of the base circle of the stationary scroll, gradually reducing the volume of the compression chamber formed by the engagement of the orbiting and stationary scrolls. The compressed medium in the compression chamber is discharged through an exhaust hole in the center of the stationary scroll into a discharge chamber within the compressor housing, where it is then discharged through the discharge port of the discharge chamber.

[0022] The following first describes in detail the scroll compressor in the related art and the problems it has with reference to FIG1 . FIG1 shows a schematic structural diagram of a scroll compressor in the related art. As shown in FIG1 , the scroll compressor 10 includes:

[0023] The housing 11 includes a fixed scroll 12, an orbiting scroll 13, an upper frame 14, a first support member 15, a crankshaft 16, a driving device 17, a second support member 18, and a lower frame 19. The fixed scroll 12 and the orbiting scroll 13 cooperate with each other to form a compression chamber.

[0024] The housing 11 comprises an upper housing 111, an intermediate housing 112, and a lower housing 113. These upper, intermediate, and lower housings 111, 112, and 113 together form an inner chamber. A discharge chamber is formed between the upper housing 111 and the stationary scroll 12. This discharge chamber communicates with the compression chamber, allowing compressed medium to flow from the compression chamber into the discharge chamber and be discharged through a discharge port in the upper housing 111.

[0025] The intermediate housing 112 is cylindrical, and the upper frame 14 is fixed to the inner wall of the intermediate housing 112 by interference fit.

[0026] The fixed scroll 12 is fixed on the upper frame 14, and the movable scroll 13 is movably connected to the upper frame 14 via a first support member 15. The first support member 15 is usually a thrust bearing.

[0027] The driving device 17 includes a stator 171 and a rotor 172 , wherein the stator 171 is fixedly connected to the intermediate housing 112 , and the fixed connection method may be, for example, an interference fit; the rotor 172 is sleeved on the crankshaft 16 to drive the crankshaft 16 to rotate.

[0028] The first end of the crankshaft 16 is connected to the movable scroll 13, and the second end is connected to the second supporting member 18. The second supporting member 18 can be, for example, a seated bearing, whose bearing seat is usually fixed on the lower frame 19, and the lower frame 19 is fixedly connected to the intermediate casing 112. The fixed connection method can be, for example, an interference fit.

[0029] Driven by the driving device 17 , the crankshaft 16 drives the orbiting scroll 13 to perform non-rotating translational motion, thereby changing the volume of the compression chamber and achieving compression of the medium to be compressed.

[0030] The noise level of a compressor directly affects the noise level of the air conditioner, heat pump, or refrigeration unit in which it is used. In the era of energy conservation (ESG), variable frequency units and variable frequency compressors are becoming increasingly important, and there is a demand for expansion to higher speeds. However, during high-speed operation of the compressor shown in FIG1 , the movable scroll 13, the first support member 15, the crankshaft 16, the drive device 17, and the second support member 18 will all vibrate. These vibrations will be transmitted to the outer casing through the interference fit between the upper frame 14, the stator 171, and the lower frame 19 and the intermediate casing 112, generating noise.

[0031] The embodiments of the present application provide a scroll compressor to solve the above problems.

[0032] FIG2 is a schematic structural diagram of a scroll compressor 20 provided in an embodiment of the present application. The technical solution of the present application will be described in detail below with reference to FIG2 . The scroll compressor 20 in FIG2 includes: a housing 21 , a compression assembly 22 , and a damping mechanism 23 .

[0033] The compression assembly 22 includes an upper frame 221 , a fixed scroll 222 , a movable scroll 223 , a driving device 224 , a lower frame 225 , a bearing assembly 226 and a connecting sleeve 227 .

[0034] The fixed scroll 222 is fixedly connected to the upper frame 221, and the movable scroll 223 is disposed between the fixed scroll 222 and the upper frame 221 and is rotatably connected to the upper frame 221. The fixed scroll 222 and the movable scroll 223 are coupled to form a compression chamber of the scroll compressor 20.

[0035] In an embodiment of the present application, the connection method between the static vortex 222 and the upper frame 221 can be a bolt connection as shown in Figure 2. For example, a plurality of through holes can be set in the circumferential direction of the static vortex 222, and a plurality of threaded holes can be set on the side of the upper frame 221 close to the static vortex 222, and the static vortex 222 can be fixed to the upper frame 221 by bolts.

[0036] The movable scroll 223 and the upper frame 221 may be rotatably connected by providing a thrust bearing between the upper frame 221 and the movable scroll 223 , thereby ensuring that the movable scroll 223 can rotate relative to the upper frame 221 .

[0037] It should also be noted that during the operation of the scroll compressor, the orbiting scroll 223 needs to perform non-rotational translational rotation relative to the fixed scroll 222. Therefore, to limit the movement of the orbiting scroll 223, a limiting device (not shown in the figure) is usually provided between the orbiting scroll 223 and the upper frame 221. The limiting device can be, for example, a cross ring.

[0038] The drive device 224 includes a motor 2241 and a crankshaft 2242. The first end of the crankshaft 2242 is connected to the orbiting scroll 223. Specifically, a crankshaft mounting hole is provided on the side of the orbiting scroll 223 near the crankshaft 2242, and the first end of the crankshaft 2242 extends into the crankshaft mounting hole. Due to the relative motion between the crankshaft 2242 and the orbiting scroll 223, a bearing is also provided between the crankshaft 2242 and the orbiting scroll 223. This bearing is typically a sliding bearing.

[0039] The motor 2241 includes a stator 2241A and a rotor 2241B, wherein the rotor 2241B is mounted on the crankshaft 2242 and the two components are relatively fixed. The rotor 2241B and the crankshaft 2242 can be connected by a key connection or an interference fit. When the rotor 2241B rotates, it drives the crankshaft 2242 to rotate, thereby driving the orbiting scroll 223 to move.

[0040] The second end of the crankshaft 2242 is connected to the lower frame 225 via a bearing assembly 226. The bearing assembly 226 and the lower frame 225 are used to support the crankshaft 2242 and limit axial movement of the crankshaft 2242. The bearing assembly 226 can be, for example, a thrust bearing; or, as an implementation, the bearing assembly 226 can be a seated bearing, which is sleeved on the second end of the crankshaft 2242, and the bearing seat is fixed to the lower frame 225.

[0041] The connecting sleeve 227 is fixedly connected to the upper frame 221 and the lower frame 225, and is also fixedly connected to the motor 2241. The fixed connection between the connecting sleeve 227 and the motor 2241 is specifically that the sleeve 227 is connected to the stator 2241A in the motor 2241.

[0042] Since the upper frame 221, the lower frame 225 and the stator 2241A are fixedly connected to the connecting sleeve 227, it can ensure that the relative positions of the components such as the static scroll 222, the movable scroll 223, the crankshaft 2242, the rotor 2241B and the bearing assembly 226 in the compression assembly 22 will not change, and the installation and positioning of the various components in the compression assembly 22 no longer depend on the shell 21.

[0043] The shock absorbing mechanism 23 is disposed between the compression assembly 22 and the housing 21 and is used to reduce vibration of the compressor, especially vibration of the compression assembly, thereby reducing noise during operation of the scroll compressor 20 .

[0044] According to the technical solution provided in the embodiment of the present application, the various components in the compression assembly 22 are connected by using a connecting sleeve 227, eliminating the interference fit between the frame and the housing, the motor and the housing, and the lower bearing and the housing in the existing solution, so that all vibration sources in the scroll compressor are connected through the shock absorbing mechanism. When the compressor is running, the vibration generated by the movement of the various components and the compression of the gas is alleviated by the shock absorbing mechanism and the remaining vibration is transmitted to the housing. In this way, the noise during the operation of the compressor can be reduced.

[0045] In some embodiments, the housing 21 includes an upper housing 211 , a middle housing 212 and a lower housing 213 .

[0046] The upper housing 211 includes a top cover 2111 and an inner cover 2112. The top cover 2111, the inner cover 2112, and the fixed scroll 222 together form a discharge chamber. The fixed scroll 222 has an exhaust port that connects the discharge chamber with the compression chamber. The compressed gas enters the discharge chamber through the exhaust port and is then discharged to the outside of the compressor through the exhaust port on the top cover 2111.

[0047] During compressor operation, the compression assembly 22 vibrates, and relative motion occurs between the compression assembly 22 and the housing 21. If a gap exists between the fixed scroll 222 and the inner cover 2112, this will cause air leakage in the discharge chamber, thereby reducing exhaust pressure. Therefore, in this embodiment of the present application, the vibration damping mechanism 23 includes a sealing ring 231, which is positioned between the inner cover 2112 and the fixed scroll 222 to seal the gap between them. Preferably, the sealing ring 231 employs a radial sealing mechanism.

[0048] In some embodiments, the sealing ring 231 is an O-shaped rubber sealing ring. When vibration occurs, the relative movement between the fixed scroll 222 and the inner cover 2112 is offset by the elastic deformation of the rubber sealing ring, thereby ensuring that the discharge chamber has good sealing performance.

[0049] In some embodiments, the shock absorbing mechanism 23 further includes at least one elastic shock absorbing unit 232, which is disposed between the compression assembly 22 and the lower housing 213. As shown in FIG2 , the elastic shock absorbing unit 232 is disposed below the compression assembly 22, with one end of the elastic shock absorbing unit 232 being fixed to the compression assembly and the other end being fixed to the lower housing.

[0050] The elastic shock absorbing unit 232 may be a buffer spring as shown in the figure, one end of which is fixed to the bottom of the lower frame 225 and the other end is fixed to the lower shell 213. The buffer spring plays the role of both support and shock absorption in the scroll compressor.

[0051] In some embodiments, the elastic shock absorbing unit 232 can also be a spring damper or a rubber shock absorber, etc.; wherein, the spring damper can absorb the impact force of the vibration while reducing the vibration; the rubber shock absorber is made of a rubber material with a high elastic modulus, which can provide good support for the compression assembly 22 and has better economy.

[0052] In some embodiments, as shown in FIG2 , the fixed scroll 222 is connected to the upper frame 221 via a plurality of threaded fasteners 228A. Specifically, a plurality of mounting holes 2221 are defined circumferentially of the fixed scroll 222. Furthermore, a plurality of first threaded holes 2211 are correspondingly defined on a side of the upper frame 221 proximate to the fixed scroll 222. The plurality of threaded fasteners 228A are respectively inserted into the mounting holes 2221 and the first threaded holes 2211, thereby securing the fixed scroll 222 to the upper frame 221.

[0053] In some embodiments, referring again to FIG2 , the upper frame 221 and the connecting sleeve 227 are connected via threaded fasteners 228B. More specifically, referring to FIG2 , a plurality of first connecting holes 2271 are provided at one end of the connecting sleeve 227 proximal to the upper frame 221. These first connecting holes 2271 are distributed along the circumference of the connecting sleeve 227. Furthermore, a plurality of second threaded holes 2212 are correspondingly provided on the upper frame 221. Threaded fasteners 228B pass through the first and second threaded holes 2271, 2212, to secure the upper frame 221 to the connecting sleeve 227.

[0054] In addition, as a possible implementation method, the upper frame 221 and the connecting sleeve 227 can also be connected by interference fit, welding, threaded connection, etc., so as to achieve relative fixation.

[0055] In some embodiments, referring to FIG. 2 , the lower frame 225 and the connecting sleeve 227 may be connected via a threaded fastener 228C. The specific connection method is similar to the connection method between the upper frame 221 and the connecting sleeve 227 described above, and will not be described in detail here.

[0056] In some embodiments, the fixed connection between the connecting sleeve 227 and the stator 2241A in the motor 2241 can be: the outer circumference of the stator 2241A is interference-connected with the inner circumference of the connecting sleeve 227, thereby ensuring that the stator 2241 is fixed relative to the connecting sleeve 227.

[0057] As a possible implementation method, the connection method between the stator 2241A and the connecting sleeve 227 can also be welding, threaded connection, threaded fastener connection, etc., which is not specifically limited in the embodiment of the present application.

[0058] The technical solutions provided in the embodiments of this application are preferably applied to variable-frequency compressors. During operation, the operating frequency of a variable-frequency compressor varies according to actual needs. Correspondingly, the vibration level of the compressor also varies with the frequency. Utilizing the vibration reduction solutions provided in the embodiments of this application, good vibration reduction effects can be achieved at different operating frequencies. Of course, this solution is not limited to variable-frequency compressors; the technical solution is also applicable to fixed-frequency compressors.

[0059] It should also be noted that the above technical solution can be applied to a high-pressure chamber compressor or a low-pressure chamber compressor, and the embodiments of the present application do not make specific limitations on this.

[0060] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0061] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0062] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0063] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A scroll compressor, characterized in that: It includes a housing, a compression assembly and a shock absorbing mechanism; The compression assembly is arranged in the inner cavity of the housing, and the compression assembly comprises: Mount the rack; A static vortex disk, fixedly connected to the upper frame; A movable scroll, rotatably connected to the upper frame and engaged with the fixed scroll to form a compression chamber; A driving device, comprising a motor and a crankshaft, wherein a first end of the crankshaft is connected to the movable scroll, and the motor is used to drive the crankshaft to rotate so as to drive the movable scroll to move; a lower frame, the second end of the crankshaft being connected to the lower frame via a bearing assembly; A connecting sleeve, fixedly connected to the upper frame and the lower frame, and fixedly connected to the motor; The damping mechanism is disposed between the compression assembly and the housing to reduce noise of the scroll compressor.

2. The scroll compressor according to claim 1, characterized in that: The housing comprises an upper housing, an intermediate housing and a lower housing; The shock absorbing mechanism includes at least one elastic shock absorbing unit, and the at least one elastic shock absorbing unit is arranged between the compression assembly and the lower shell.

3. The scroll compressor according to claim 2, characterized in that: The elastic shock absorbing unit is a buffer spring, a spring damper or a rubber shock absorber.

4. The scroll compressor according to claim 2 or 3, characterized in that: The upper housing comprises a top cover and an inner cover, wherein the top cover, the inner cover and the fixed scroll disk together form a discharge chamber of the scroll compressor; as well as The damping mechanism comprises a sealing ring, which is arranged between the stationary scroll and the inner cover and is used for sealing a gap between the discharge chamber and the stationary scroll when the compression assembly vibrates.

5. The scroll compressor according to claim 4, characterized in that: The sealing ring adopts a radial sealing method.

6. The scroll compressor according to any one of claims 1 to 5, characterized in that: The stationary scroll is connected to the upper frame via threaded fasteners.

7. The scroll compressor according to any one of claims 1 to 6, characterized in that: The upper frame is connected to the connecting sleeve by one of the following methods: interference connection, welding, threaded connection and threaded fastener connection.

8. The scroll compressor according to any one of claims 1 to 7, characterized in that: The lower frame is connected to the connecting sleeve by one of the following methods: interference connection, welding, threaded connection and threaded fastener connection.

9. The scroll compressor according to any one of claims 1 to 8, characterized in that: The connection method between the connecting sleeve and the motor is any one of the following: interference connection, welding, threaded connection and threaded fastener connection.

10. The scroll compressor according to any one of claims 1 to 9, characterized in that: The scroll compressor is a variable frequency scroll compressor.

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