Electric scroll compressor

Abstract

The utility model provides an electric scroll compressor, which comprises a fixed plate, a fixed plate, a fixed scroll plate, a fixed scroll plate, a fixed scroll plate, a fixed scroll plate, a fixed scroll plate, a fixed scroll plate and a fixed scroll plate, and is characterized in that the fixed scroll plate is provided with spiral fixed scroll teeth; the movable disc is provided with movable scroll teeth, grooves are formed in the end faces of the movable scroll teeth, the movable disc is located above the fixed disc, and the movable scroll teeth and the fixed scroll teeth are meshed with each other to form a plurality of compression cavities; the driving mechanism comprises a motor and a driving eccentric shaft, and the driving eccentric shaft is a stepped shaft; the support is provided with a main bearing hole, and the driving eccentric shaft penetrates through the main bearing hole of the support; the motor drives the driving eccentric shaft to rotate so as to drive the movable disc to eccentrically move relative to the fixed disc; and the fixed scroll sealing strip and the movable scroll sealing strip are mounted in grooves in the end surfaces of the movable scroll teeth of the movable disc and the fixed disc. The axial leakage problem is effectively solved, and the volume efficiency and isentropic efficiency of the compressor are improved. And meanwhile, the overall performance and reliability of the compressor are improved, so that the compressor is particularly suitable for the large-displacement electric scroll compressor.

Description

Technical Field

[0001] This utility model relates to an electric scroll compressor. Background Technology

[0002] With increasing global emphasis on energy conservation, emission reduction, and environmental protection, fields such as electric vehicles, new energy air conditioning, and heat pump systems have experienced rapid development. As a core component of these systems, the performance of electric scroll compressors directly affects the energy efficiency and reliability of the entire system. Therefore, research and improvement of electric scroll compressors have always been a hot topic in the industry.

[0003] A scroll compressor is a positive displacement compressor. Its working principle utilizes the relative motion of moving and stationary scroll teeth to create a series of compression chambers with gradually changing volumes, thereby compressing the gas. Compared to traditional reciprocating and rotary compressors, scroll compressors have advantages such as compact structure, fewer parts, smooth operation, low noise, and high efficiency. They are particularly suitable for applications with strict requirements regarding size, weight, vibration, and noise, such as electric vehicle air conditioning and heat pump systems.

[0004] In recent years, with the rapid expansion of the electric vehicle market, the demand for large-displacement, high-efficiency, and high-reliability electric scroll compressors has become increasingly urgent. However, large-displacement electric scroll compressors face a series of technical challenges in design and manufacturing, among which sealing is one of the key factors restricting performance improvement.

[0005] Scroll compressors have multiple leakage paths, primarily radial and axial leakage. Radial leakage refers to gas leakage through the radial gap between the moving and stationary scroll teeth; axial leakage refers to gas leakage through the axial gap between the scroll tooth end faces and the opposite end plates. For large-displacement scroll compressors, due to their longer scroll teeth and larger compression chambers, leakage problems are more prominent, and the requirements for the sealing structure are also higher.

[0006] To address the leakage problem of scroll compressors, various sealing solutions have been proposed in the prior art. One such solution, disclosed in Chinese Patent Application Publication No. CN116447136A, is a "Sealing, Vibration Isolation, and Noise Reduction Structure for an Electric Scroll Compressor." This structure includes a motor housing, an end cover, a stationary scroll, a moving scroll, a moving scroll damping ring, a moving scroll O-ring, a bearing housing, a wear-resistant pad, an end cover sealing gasket, a stationary scroll damping pad, an exhaust port sealing gasket, and end cover fastening bolts. This patent achieves sealing by using multiple O-rings, damping rings, and sealing gaskets. Specifically, the moving scroll damping ring and the moving scroll O-ring are positioned between the bearing housing and the wear-resistant pad; the stationary scroll damping pad is positioned on the rear end face of the stationary scroll; the end cover sealing gasket is positioned between the motor housing and the end cover; and the exhaust port sealing gasket is positioned inside the stationary scroll.

[0007] Frankly speaking, while this sealing method, which uses multiple O-rings, damping rings, and gaskets, can provide a certain level of sealing, its structure is complex, with a large number of parts, making assembly difficult. More importantly, this sealing method relies primarily on the elastic deformation of the O-rings, damping rings, and gaskets. Its sealing effectiveness is affected by various factors such as material properties, machining precision, and assembly quality, making it difficult to guarantee sealing reliability. Especially under harsh operating conditions such as high pressure differentials, high speeds, and high temperatures, the O-rings, damping rings, and gaskets are prone to aging, deformation, and wear, leading to seal failure and consequently affecting the compressor's performance and lifespan.

[0008] Furthermore, for large-displacement electric scroll compressors, the losses caused by gas leakage are greater due to their longer scroll teeth and larger compression chambers. Traditional sealing methods such as O-rings and shock absorbers mainly rely on radial sealing, which is insufficient to effectively prevent axial leakage of gas through the end faces of the scroll teeth. Axial leakage is one of the main leakage pathways in scroll compressors, especially under high pressure differential conditions, where axial leakage is even more severe.

[0009] Besides axial leakage, the performance and reliability of large-displacement electric scroll compressors are also related to the support of the internal components. Currently, existing technologies typically use bearings to support rotating parts. Large-displacement electric scroll compressors usually require larger bearings, which need reliable fixing to prevent axial movement. In existing technologies, many solutions also adjust back pressure and thus control axial force by setting up a back pressure chamber, but this structure with a back pressure chamber is relatively complex.

[0010] In summary, considering the problems existing in current technologies, the inventors believe it is necessary to develop a new sealing and support structure to solve the sealing challenges of large-displacement electric scroll compressors under high pressure differentials and high speeds, thereby improving compressor performance and reliability to meet the growing market demand. In particular, a completely new sealing and support solution needs to be developed specifically for large-displacement compressors to address the problems in existing technologies. This is not only significant for improving the energy efficiency of electric vehicle air conditioning and heat pump systems, but also plays a positive role in promoting the development of the entire new energy industry. The new sealing and support structure should have advantages such as simple structure, reliable sealing, easy assembly, and low cost, and should effectively reduce axial leakage, improving the compressor's volumetric efficiency and isentropic efficiency. Simultaneously, the new structure should be able to withstand high loads and high speeds, ensuring stable compressor operation under various operating conditions. Utility Model Content

[0011] The purpose of this invention is to provide an electric scroll compressor to solve the problems of insufficient sealing performance, complex structure, and low reliability of existing large-displacement electric scroll compressors.

[0012] To achieve the above objectives, the present invention adopts the following technical solution:

[0013] An electric scroll compressor includes: a fixed disk with fixed scroll teeth, the fixed scroll teeth being helical and having grooves on their end faces; a moving disk with moving scroll teeth, the moving scroll teeth being helical and having grooves on their end faces, the moving disk being located above the fixed disk, and the moving scroll teeth and the fixed scroll teeth meshing with each other to form multiple compression chambers; a drive mechanism including a motor and a drive eccentric shaft, the drive eccentric shaft being a stepped shaft; a bracket with a main bearing hole, the drive eccentric shaft passing through the main bearing hole of the bracket; the motor driving the drive eccentric shaft to rotate, thereby driving the moving disk to perform eccentric motion relative to the fixed disk; a fixed scroll sealing strip, which is elongated and installed in the grooves on the end faces of the fixed scroll teeth of the fixed disk, matching the shape of the end faces of the fixed scroll teeth; and a moving scroll sealing strip, which is elongated and installed in the grooves on the end faces of the moving scroll teeth of the moving disk, matching the shape of the end faces of the moving scroll teeth.

[0014] This invention achieves efficient and reliable sealing through the aforementioned structure. The fixed and moving discs are the core components of the scroll compressor; their helical scroll teeth mesh to form multiple compression chambers, which is the foundation for gas compression. The helical scroll tooth design ensures a smooth change in the volume of the compression chambers, facilitating a continuous and stable compression process. Grooves on the end faces of the fixed and moving scroll teeth are for installing sealing strips. The drive mechanism provides power to the moving disc, with the motor providing the power source. The drive eccentric shaft converts the motor's rotational motion into the eccentric motion of the moving disc, which is crucial for achieving relative motion between the moving and stationary scroll teeth and completing the compression process. The drive eccentric shaft adopts a stepped shaft design, allowing it to cooperate with different components to achieve power transmission and eccentric motion conversion. The bracket serves to fix and support the components, and its main bearing hole is used to install the main bearing. The drive eccentric shaft passes through the main bearing hole of the bracket, obtaining stable support. The motor drives the eccentric shaft to rotate, thus providing power input. The eccentric shaft drives the moving disc to move eccentrically relative to the fixed disc, which is crucial for the relative motion between the moving and fixed discs, thereby achieving the compression function. Most importantly, the fixed and moving scroll seals are respectively installed in the grooves on the scroll tooth end faces of the fixed and moving discs. These two long, strip-shaped seals effectively fill the gap between the scroll tooth end faces and the opposite end plates during compressor operation, preventing gas leakage through the axial clearance, achieving end face sealing, significantly reducing leakage, and avoiding wear on the scroll tooth end faces.

[0015] Preferably, it also includes a main bearing and a secondary bearing, and the drive eccentric shaft is supported by the main bearing and the secondary bearing; the bracket is fixed to the motor housing.

[0016] By adding main and auxiliary bearings, a more stable and reliable support can be provided for the drive eccentric shaft, ensuring its rotational accuracy. This is a prerequisite for precise meshing of the moving and fixed discs, thus guaranteeing the sealing effect. The bracket is fixed to the motor housing, providing a stable mounting position for the main bearing, further improving the reliability of the entire support system, enhancing the reliability and lifespan of the compressor, and ensuring the effective operation of the sealing structure.

[0017] Preferably, the support is provided with an anti-rotation mechanism, and the moving plate is connected to the anti-rotation mechanism.

[0018] By installing an anti-rotation mechanism on the support and connecting the moving disc to this mechanism, it is possible to effectively prevent the moving disc from rotating during eccentric motion. Rotation of the moving disc can cause the scroll gears to fail to mesh properly, thus affecting the compression process. Therefore, the anti-rotation mechanism is a key component ensuring the normal operation of the compressor, achieving correct meshing and compression.

[0019] Preferably, the anti-rotation mechanism is a cylindrical pin anti-rotation mechanism.

[0020] The cylindrical pin anti-rotation mechanism is simple in structure, easy to manufacture, and reliable in operation. It is a mature and economical anti-rotation solution that clarifies the method used to prevent rotation and is simple and reliable.

[0021] Preferably, it also includes a main balance block, which is mounted on the eccentric end of the drive eccentric shaft.

[0022] The main balance block effectively balances the inertial force generated during the eccentric motion of the moving disc, thereby reducing compressor vibration and noise. This allows the anti-rotation mechanism, sealing structure, and bearing support structure to operate more stably and reliably. The main balance block is installed at the eccentric end of the drive eccentric shaft, which is the optimal position for balancing.

[0023] Preferably, the motor includes a rotor, and the rotor of the motor is mounted in the middle of the drive eccentric shaft.

[0024] The motor rotor is directly mounted on the middle of the drive eccentric shaft, realizing efficient power transmission from the motor to the drive eccentric shaft, and the structure is compact.

[0025] Preferably, the motor housing is also included, wherein a secondary bearing hole is provided in the middle of the bottom of the motor housing, and a motor mounting hole is provided in the middle of the motor housing.

[0026] The motor housing not only protects the motor but also provides a mounting location for the auxiliary bearing. The auxiliary bearing hole in the middle of the bottom of the motor housing and the motor mounting hole in the middle provide precise mounting positions for the auxiliary bearing and the motor, respectively, ensuring the stability of the entire power transmission and support system and providing a more complete description of the power transmission and support system.

[0027] This invention effectively solves the axial leakage problem by setting sealing strips on the end faces of the moving and stationary scroll teeth, thereby improving the volumetric efficiency and isentropic efficiency of the compressor. Simultaneously, by optimizing the bearing support structure, setting anti-rotation mechanisms and balance blocks, the overall performance and reliability of the compressor are improved, making it particularly suitable for large-displacement electric scroll compressors. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an electric scroll compressor according to one embodiment of the present invention.

[0029] Figure 2 This is a cross-sectional structural schematic diagram of an electric scroll compressor according to one embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of the moving vortex tooth and the fixed vortex tooth according to one embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] Figure 1 This is a schematic diagram of the structure of an electric scroll compressor according to one embodiment of the present invention. Figure 2 This is a cross-sectional structural schematic diagram of an electric scroll compressor according to one embodiment of the present invention. Figure 3 This is a schematic diagram of the structure of the moving vortex tooth and the fixed vortex tooth according to one embodiment of the present invention.

[0033] Please see Figure 1-3This utility model provides an electric scroll compressor, comprising: a fixed disk 10 having fixed scroll teeth 15, the fixed scroll teeth being helical and having grooves on their end faces; a moving disk 9 having moving scroll teeth 16, the moving scroll teeth being helical and having grooves on their end faces; the moving disk 9 being located above the fixed disk 10, and the moving scroll teeth and the fixed scroll teeth meshing with each other to form multiple compression chambers; and a drive mechanism including a motor 18 and a drive eccentric shaft 5. The drive eccentric shaft 5 is a stepped shaft; the bracket 7 has a main bearing hole, through which the drive eccentric shaft 5 passes; the motor 18 drives the drive eccentric shaft 5 to rotate, thereby driving the moving disk 9 to perform eccentric motion relative to the fixed disk 10; the fixed vortex sealing strip 12 is long and is installed in the groove of the fixed vortex tooth end face of the fixed disk 10; the moving vortex sealing strip 13 is long and is installed in the groove of the moving vortex tooth end face of the moving disk 9.

[0034] This invention achieves efficient and reliable sealing through the aforementioned structure. The fixed disk 10 and the moving disk 9 are the core components of the scroll compressor. Their helical scroll teeth mesh with each other, forming multiple compression chambers, which is the foundation for gas compression. The helical scroll tooth design ensures a smooth change in the volume of the compression chambers, facilitating a continuous and stable compression process. Grooves on the end faces of the fixed and moving scroll teeth are for installing sealing strips. The drive mechanism provides power to the moving disk, with the motor 18 providing the power source. The drive eccentric shaft 5 converts the rotational motion of the motor 18 into the eccentric motion of the moving disk 9, which is crucial for achieving relative motion between the moving and stationary scroll teeth and completing the compression process. The drive eccentric shaft 5 adopts a stepped shaft design, allowing it to cooperate with different components to achieve power transmission and eccentric motion conversion. The bracket 7 serves to fix and support the components, and its main bearing hole is used to install the main bearing. The drive eccentric shaft 5 passes through the main bearing hole of the bracket 7, obtaining stable support. The motor 18 drives the drive eccentric shaft 5 to rotate, realizing power input. The eccentric shaft 5 drives the moving disc 9 to move eccentrically relative to the fixed disc 10, which is key to achieving relative motion between the moving and fixed discs and thus realizing the compression function. Most importantly, the fixed scroll seal 12 and the moving scroll seal 13 are respectively installed in the grooves on the scroll tooth end faces of the fixed disc 10 and the moving disc 9. These two long, strip-shaped seals effectively fill the gap between the scroll tooth end face and the opposite end plate when the compressor is working, preventing gas leakage through the axial gap, achieving end face sealing, significantly reducing leakage, and avoiding wear on the scroll tooth end faces.

[0035] In this embodiment, a main bearing 6 and a secondary bearing 3 are also included, and the drive eccentric shaft 5 is supported by the main bearing 6 and the secondary bearing 3; the bracket 7 is fixed on the motor housing 4.

[0036] By adding the main bearing 6 and the auxiliary bearing 3, a more stable and reliable support can be provided for the drive eccentric shaft 5, ensuring the rotational accuracy of the drive eccentric shaft 5. This is a prerequisite for the precise meshing of the moving plate 9 and the fixed plate 10, thereby ensuring the sealing effect. The bracket 7 is fixed on the motor housing 4, providing a stable mounting position for the main bearing 6, further improving the reliability of the entire support system, increasing the reliability and lifespan of the compressor, and ensuring the effective operation of the sealing structure.

[0037] In this embodiment, the support 7 is provided with an anti-rotation mechanism 14, and the moving plate 9 is connected to the anti-rotation mechanism 14.

[0038] An anti-rotation mechanism 14 is installed on the bracket 7, and the moving disc 9 is connected to the anti-rotation mechanism 14. This effectively prevents the moving disc 9 from rotating during eccentric motion. Rotation of the moving disc 9 will cause the scroll gears to fail to mesh properly, thus affecting the compression process. Therefore, the anti-rotation mechanism 14 is a key component to ensure the normal operation of the compressor, achieving correct meshing and compression.

[0039] In this embodiment, the anti-rotation mechanism 14 is a cylindrical pin anti-rotation mechanism.

[0040] The cylindrical pin anti-rotation mechanism is simple in structure, easy to manufacture, and reliable in operation. It is a mature and economical anti-rotation solution that clarifies the method used to prevent rotation and is simple and reliable.

[0041] In this embodiment, a main balancing block 8 is also included, which is installed at the eccentric end of the drive eccentric shaft 5.

[0042] The main balance block 8 effectively balances the inertial force generated by the moving disc 9 during eccentric motion, thereby reducing compressor vibration and noise. This allows the anti-rotation mechanism 14, sealing structure, bearing support structure, etc., to operate more stably and reliably. The main balance block 8 is installed at the eccentric end of the drive eccentric shaft 5, which is the optimal position for balancing.

[0043] In this embodiment, the motor 18 includes a rotor 17, and the rotor 17 of the motor is mounted in the middle of the drive eccentric shaft 5.

[0044] The rotor 17 of the motor is directly mounted on the middle of the drive eccentric shaft 5, realizing efficient power transmission from the motor 18 to the drive eccentric shaft 5, and the structure is compact.

[0045] In this embodiment, a motor housing 4 is also included. The motor housing 4 has a secondary bearing hole in the middle of its bottom and a motor mounting hole in the middle of its center.

[0046] The motor housing 4 not only protects the motor 18 but also provides a mounting position for the auxiliary bearing 3. The auxiliary bearing hole in the middle of the bottom of the motor housing 4 and the motor mounting hole in the middle provide precise mounting positions for the auxiliary bearing 3 and the motor 18, respectively, ensuring the stability of the entire power transmission and support system and providing a more complete description of the power transmission and support system.

[0047] Specifically, in this embodiment, the electric scroll compressor also includes a controller 1 (not fully shown in the figures). The controller 1 includes a PCB control board for controlling the compressor and is connected to the motor 18 via three-phase terminals 2. It is roughly cuboid in shape with multiple interfaces on one side. The rear cover 11 is roughly disc-shaped with multiple protrusions and grooves, and has an exhaust port located on the top right side of the rear cover 11. The stationary plate 10 includes a main body shell and stationary scroll teeth, forming a flanged disc structure with multiple holes on the flange. The moving plate 9 includes a moving plate base plate and moving scroll teeth. A second bearing hole is provided in the center of the back of the moving plate base plate. The moving and stationary scroll teeth mesh to form a sealed compression chamber. It is disc-shaped with a spiral protrusion on one side. The bracket 7 is a flanged disc structure with multiple holes on the flange and a large hole in the center. The motor housing 4 is cylindrical with flanges on both sides and multiple holes on the flanges. The drive eccentric shaft 5 is a stepped shaft with different diameters at different locations. Both the main bearing 6 and the secondary bearing 3 are cylindrical ring structures. The main balance block 8 has an irregular shape, roughly block-like. The fixed vortex seal 12 and the moving vortex seal 13 are both elongated strips. The anti-rotation mechanism 14 is a cylindrical pin anti-rotation mechanism. The motor rotor 17 is assembled with the drive eccentric shaft 5 at its center.

[0048] Controller 1 is connected to motor 18 via three-phase terminals. The moving and fixed volute gears mesh to form a sealed compression chamber. Bracket 7 is connected to moving disk 9 via anti-rotation mechanism 14. Bracket 7, rear cover 11, and fixed disk 10 are connected via flange bolts. Bracket 7 is connected to motor housing 4 via flange bolts. Controller 1 box is connected to motor housing 4 via flange bolts. The eccentric end of drive eccentric shaft 5 passes through the main bearing 6 hole and is fitted with main balance block 8. The rotor 17 of the motor is fitted in the middle of drive eccentric shaft 5, and the other end is fitted with auxiliary bearing 3, fixed to the center of motor housing 4. Auxiliary bearing 3 is fixed to the center of motor housing 4. Main balance block 8 is connected to moving disk 9 via bearings. Motor 18 drives drive eccentric shaft 5 to rotate. Fixed volute sealing strip 12 is installed in the groove on the end face of the volute gear of fixed disk 10. Moving volute sealing strip 13 is installed in the groove on the end face of the volute gear of moving disk 9. Moving disk 9 is located above fixed disk 10. Drive eccentric shaft 5 passes through the center hole of bracket 7.

Claims

1. An electric scroll compressor, characterized in that, include: The fixed plate (10) has a fixed vortex tooth, which is spiral in shape and has a groove on the end face of the fixed vortex tooth; The moving disk (9) has a moving vortex tooth, which is spiral in shape and has a groove on its end face. The moving disk (9) is located above the fixed disk (10), and the moving vortex tooth and the fixed vortex tooth mesh with each other to form multiple compression cavities. The drive mechanism includes a motor (18) and a drive eccentric shaft (5), the drive eccentric shaft (5) being a stepped shaft; a bracket (7) having a main bearing hole, the drive eccentric shaft (5) passing through the main bearing hole of the bracket (7); the motor (18) drives the drive eccentric shaft (5) to rotate, thereby driving the moving disk (9) to perform eccentric motion relative to the fixed disk (10); The fixed vortex sealing strip (12) is long and is installed in the groove of the fixed vortex tooth end face of the fixed plate (10); The moving vortex sealing strip (13) is long and is installed in the groove of the moving vortex tooth end face of the moving disk (9).

2. The electric scroll compressor according to claim 1, characterized in that, It also includes a main bearing (6) and a secondary bearing (3), the drive eccentric shaft (5) is supported by the main bearing (6) and the secondary bearing (3); the bracket (7) is fixed on the motor housing (4).

3. The electric scroll compressor according to claim 2, characterized in that, The bracket (7) is provided with an anti-rotation mechanism (14), and the moving plate (9) is connected to the anti-rotation mechanism (14).

4. The electric scroll compressor according to claim 3, characterized in that... The anti-rotation mechanism is a cylindrical pin anti-rotation mechanism.

5. The electric scroll compressor according to claim 4, characterized in that, It also includes a main balancing block (8), which is installed at the eccentric end of the drive eccentric shaft (5).

6. The electric scroll compressor according to claim 5, characterized in that, The motor (18) includes a rotor (17), and the rotor (17) is mounted on the middle part of the drive eccentric shaft (5).

7. The electric scroll compressor according to claim 6, characterized in that, It also includes a motor housing (4), the bottom center of which is provided with a secondary bearing hole, and the middle of which is provided with a motor mounting hole.

Images