Scroll sealing structure of scroll compressor
By setting uniformly wide and uniformly narrow sealing grooves on the scroll profile of the scroll compressor and embedding a variable-width sealing strip, the problems of increased internal leakage and processing difficulty caused by the variable wall thickness scroll profile are solved, achieving higher volumetric efficiency and simplified processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI VELLE AUTOMOBILE AIR CONDITIONER CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-05-26
AI Technical Summary
The variable wall thickness scroll profile leads to increased internal leakage in scroll compressors due to the sealing strip design, and the manufacturing process is difficult. Existing sealing structures cannot effectively solve this problem.
A scroll seal structure for a scroll compressor is designed, which uses a scroll profile with variable wall thickness to set uniform width and uniform narrow sealing grooves on the inner and outer rings, respectively, and embeds a variable width sealing strip to reduce the volume of the tangential leakage channel and simplify the manufacturing process.
It reduces leakage in the axial clearance of the seal, reduces internal leakage in the compressor, improves the volumetric efficiency of the compressor, simplifies the manufacturing process, and reduces manufacturing costs.
Smart Images
Figure CN224282922U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of compressor sealing technology, and in particular to a scroll seal structure for a scroll compressor. Background Technology
[0002] An electric scroll compressor mainly consists of two meshing scrolls: a fixed scroll and a moving scroll with the same linear shape. The two scrolls are offset from each other and mounted together with a phase angle difference of 180 degrees. The fixed scroll is fixed to the frame, while the moving scroll is directly driven by an electric motor but cannot rotate on its own axis; it can only revolve around the fixed scroll with a very small radius of rotation. The refrigerant gas is gradually compressed within the crescent-shaped compression chamber formed by the fixed and moving scrolls. The suction chamber is the outermost two crescent-shaped spaces of the scroll that are completely sealed off (e.g., the outermost two crescent-shaped spaces). Figure 3 As shown, because all working chambers gradually decrease in size from the outside to the inside and are under different compression conditions, the electric scroll compressor can continuously perform the intake, compression, and exhaust processes. The scroll profile used to construct the working chambers is the foundation of scroll compressor research and design, and variable wall thickness scroll profiles are increasingly being incorporated into modern scroll compressor designs. The advantages of variable wall thickness scroll profiles are that the high-pressure chamber in the center is thicker than the outer low-pressure chamber, allowing the center to withstand greater gas forces and improving its stress distribution. Compared to a circular involute profile with the same disk diameter, it offers a larger intake volume and a higher compression ratio, thus helping to reduce the compressor's size and weight.
[0003] To ensure performance, scroll compressors are designed with pump body leakage in mind. The refrigerant compressed in each compression chamber tends to leak from the high-pressure chamber to the low-pressure chamber. The sealing clearance of the scroll plate in a scroll compressor is divided into radial clearance and axial clearance. Leakage mainly occurs through tangential leakage via the radial clearance (e.g.,...). Figure 1 (as shown) and radial leakage through axial clearance (such as Figure 2 (As shown). Currently, there are two technical approaches to prevent radial leakage. One is to introduce high-pressure gas on the back of the moving scroll to balance the axial force in a floating structure. The other is to create grooves on the top of the scroll teeth of the moving and stationary scrolls, and place a sealing strip made of self-lubricating material in the grooves to prevent radial leakage through the axial gap. The sealing strip approach is less affected by changes in operating conditions, has a simple structure, fewer failures, and lower cost, so more manufacturers use this approach.
[0004] However, the variable wall thickness profile introduced a problem to the original sealing strip solution. The variable wall thickness profile is narrow at the tail and wide at the center, with the width at the center being about twice that of the tail. The previously used sealing strips were designed with a uniform width, which increased the volume of the tangential leakage channel at the center of the profile. Since the center of the profile is precisely the location of high pressure, this led to increased internal leakage in the compressor, thereby reducing the compression power. Therefore, it was necessary to reduce the volume of the leakage channel. To address this problem, the engineers initially designed a gradually changing sealing groove with a shape similar to the variable wall thickness profile, retaining only the safety distance of the wall thickness on both sides of the profile. However, they found that the machining was difficult, requiring a small-diameter milling cutter to perform back-and-forth precision machining, which significantly increased the machining time. Therefore, the inventors proposed an unequal width sealing structure. Utility Model Content
[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a scroll seal structure for a scroll compressor, thereby solving the problems described in the background art.
[0006] To achieve the above objectives, a scroll seal structure for a scroll compressor is provided, comprising a fixed scroll and a moving scroll. Variable wall thickness scroll profiles are provided on opposite sides of both the fixed and moving scrolls. The fixed and moving scrolls are meshed together via corresponding variable wall thickness scroll profiles. Variable width sealing grooves are provided on the side of each of the two variable wall thickness scroll profiles away from the fixed and moving scrolls. Variable width sealing strips are embedded inside each of the two variable width sealing grooves. The dividing line of the variable width sealing groove is located at the end of the suction chamber position during scroll compression.
[0007] According to the scroll seal structure of a scroll compressor, the variable width sealing groove includes an inner ring groove and an outer ring groove. Both the inner ring groove and the outer ring groove are uniform width grooves. The width of the inner ring groove is the wall thickness on both sides of the variable wall thickness scroll profile at the end minus the safety distance on both sides. The width of the outer ring groove is the wall thickness on both sides of the variable wall thickness scroll profile at the beginning end minus the safety distance on both sides.
[0008] According to the scroll seal structure of the scroll compressor, the variable width sealing strip includes a wide head section and a narrow tail section. The width of the wide head section corresponds to the width of the inner ring groove, and the width of the narrow tail section corresponds to the width of the outer ring groove. An arc transition is provided between the wide head section and the narrow tail section.
[0009] According to the scroll seal structure of the scroll compressor, the safety distance is the minimum wall thickness at which the variable wall thickness scroll profile ensures no deformation strength at that position.
[0010] According to the scroll seal structure of a scroll compressor, a housing is fixedly connected to the outside of the fixed scroll, and the moving scroll is disposed inside the housing.
[0011] The above solution has at least one of the following beneficial effects:
[0012] 1. This utility model is equipped with a variable width sealing groove. By designing uniform width grooves and uniform narrow grooves on the inner and outer rings of the variable wall thickness vortex profile, respectively, and cooperating with the corresponding variable width sealing strip, the leakage of the axial gap of the seal is reduced while the volume of the tangential leakage channel is reduced, the internal leakage of the compressor is reduced, the volumetric efficiency of the compressor is improved, and the practicality of the device is enhanced.
[0013] 2. Compared with the gradually widening sealing strip design, this utility model finds the optimal widening point between two uniformly wide and uniformly narrow grooves. During processing, the corresponding groove can be directly milled out using two milling cutters with corresponding shaft diameters, eliminating the need for multiple cutter operations for finishing. This reduces processing conditions and enhances the practicality of the device.
[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;
[0016] Figure 1 This is a schematic diagram of tangential leakage in radial clearance;
[0017] Figure 2 This is a schematic diagram of radial leakage in the axial clearance.
[0018] Figure 3 This is a schematic diagram of the crescent-shaped intake chamber of a scroll compressor according to the present invention;
[0019] Figure 4 This is a schematic diagram of the structure of the fixed vortex disk of this utility model;
[0020] Figure 5 This is a schematic diagram of the structure of the moving scroll plate of this utility model;
[0021] Figure 6 This is a schematic diagram of the structure of the variable width sealing strip of this utility model.
[0022] Legend:
[0023] 1. Fixed scroll; 2. Moving scroll; 3. Variable wall thickness scroll profile; 4. Variable width sealing groove; 5. Variable width sealing strip; 41. Inner ring groove; 42. Outer ring groove; 51. Wide head section; 52. Narrow tail section. Detailed Implementation
[0024] This section will describe in detail the specific embodiments of the present utility model. Preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model. The drawings are all in a very simplified form and use non-precise proportions. They are only used to help to explain the embodiments of the present utility model in a convenient and clear way, and should not be construed as limiting the scope of protection of the present utility model.
[0025] Reference Figure 3-6 This utility model provides a scroll seal structure for a scroll compressor, including a fixed scroll 1 and a moving scroll 2. Variable wall thickness scroll profiles 3 are provided on opposite sides of both the fixed scroll 1 and the moving scroll 2. The fixed scroll 1 and the moving scroll 2 are interlocked via corresponding variable wall thickness scroll profiles 3. A housing is fixedly connected to the outer side of the fixed scroll 1, and the moving scroll 2 is disposed inside the housing. Variable width sealing grooves 4 are provided on the sides of the two variable wall thickness scroll profiles 3 away from the fixed scroll 1 and the moving scroll 2. Variable width sealing strips 5 are embedded inside the two variable width sealing grooves 4. Each variable width sealing groove 4 includes an inner ring groove 41 and an outer ring groove 42. Both the inner ring groove 41 and the outer ring groove 42 are uniformly spaced grooves. The width of the inner ring groove 41 is the wall thickness of the variable wall thickness scroll profile 3 at its end minus the safety distance on both sides. The width of the outer ring groove 42 is... The width is the wall thickness of the variable wall thickness vortex profile 3 at the starting end minus the safety distance on both sides. The safety distance is the minimum wall thickness of the variable wall thickness vortex profile 3 at this position to ensure no deformation strength. The variable width sealing strip 5 includes a wide head section 51 and a narrow tail section 52. The width of the wide head section 51 corresponds to the width of the inner ring groove 41, and the width of the narrow tail section 52 corresponds to the width of the outer ring groove 42. An arc transition is provided between the wide head section 51 and the narrow tail section 52. The arc surface left after milling the groove with a large shaft diameter milling cutter is used. The variable width sealing groove 4 set in this invention, by making uniform width grooves and uniform narrow grooves in the inner and outer rings of the variable wall thickness vortex profile 3 respectively, and in conjunction with the corresponding variable width sealing strip 5, reduces the leakage of the sealing axial clearance and reduces the volume of the tangential leakage channel, reduces the internal leakage of the compressor, and improves the volumetric efficiency of the compressor.
[0026] The dividing line between the inner ring groove 41 and the outer ring groove 42 is located at the end of the intake chamber position during vortex compression. Compared with the gradually widening sealing strip design, by finding the optimal widening point between the two uniformly wide grooves and the uniformly narrow grooves, the corresponding grooves can be directly milled out using two milling cutters with corresponding shaft diameters during machining, without the need for multiple tool operations for finishing, thus reducing machining conditions.
[0027] Working principle: When this utility model is in operation, by designing uniformly wide and uniformly narrow grooves on the inner and outer rings of the variable wall thickness vortex profile 3, respectively, and cooperating with the corresponding variable width sealing strip 5, the leakage of the axial gap of the seal is reduced while the volume of the tangential leakage channel is reduced, thus reducing internal leakage during compression and improving the volumetric efficiency of the compressor. During processing, compared with the gradually widening sealing strip design, by finding the optimal widening point between the two uniformly wide and uniformly narrow grooves, the corresponding groove can be directly milled out using two milling cutters with corresponding shaft diameters, eliminating the need for multiple cutter operations for finishing and reducing processing conditions.
[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A scroll seal structure for a scroll compressor, comprising a fixed scroll (1) and a moving scroll (2), characterized in that: The fixed vortex (1) and the moving vortex (2) are provided with variable wall thickness vortex profiles (3) on opposite sides. The fixed vortex (1) and the moving vortex (2) are meshed with each other through corresponding variable wall thickness vortex profiles (3). The two variable wall thickness vortex profiles (3) are provided with variable width sealing grooves (4) on the side away from the fixed vortex (1) and the moving vortex (2). Variable width sealing strips (5) are embedded in the interior of the two variable width sealing grooves (4). The variable width dividing line of the variable width sealing groove (4) is located at the end of the air intake chamber position during vortex compression.
2. The scroll seal structure of a scroll compressor according to claim 1, characterized in that, The variable width sealing groove (4) includes an inner ring groove (41) and an outer ring groove (42). Both the inner ring groove (41) and the outer ring groove (42) are uniform width grooves. The width of the inner ring groove (41) is the wall thickness of the variable wall thickness vortex profile (3) at the end minus the safety distance on both sides. The width of the outer ring groove (42) is the wall thickness of the variable wall thickness vortex profile (3) at the beginning end minus the safety distance on both sides.
3. The scroll seal structure of a scroll compressor according to claim 2, characterized in that, The variable width sealing strip (5) includes a wide head section (51) and a narrow tail section (52). The width of the wide head section (51) corresponds to the width of the inner ring groove (41), and the width of the narrow tail section (52) corresponds to the width of the outer ring groove (42). An arc transition is provided between the wide head section (51) and the narrow tail section (52).
4. The scroll seal structure of a scroll compressor according to claim 2, characterized in that, The safety distance is the minimum wall thickness at which the variable wall thickness vortex profile (3) ensures no deformation strength at this position.
5. The scroll seal structure of a scroll compressor according to claim 1, characterized in that, The fixed vortex (1) is fixedly connected to a housing on its outer side, and the moving vortex (2) is disposed inside the housing.