Method for generating asymmetric profile of scroll compressor

Abstract

Disclosed is a method for generating asymmetric scroll disc profile lines of a scroll compressor, in which a scroll baseline of the scroll compressor is constructed; two normal equidistant lines are made on both sides by an equidistant method based on the scroll baseline; and two asymmetric scroll disc profile lines are obtained by changing the proportion of the offset distance of the equidistant line on one side while keeping the normal distance between the two normal equidistant lines unchanged.

Description

Technical Field

[0001] This invention relates to the field of scroll compressor technology, and in particular to a method for generating the asymmetric scroll profile of a scroll compressor. Background Technology

[0002] Scroll compressors are a new type of high-efficiency positive displacement compressor following reciprocating compressors, rotary compressors, and screw compressors. They are widely recognized as the most technologically advanced third-generation compressors. With their high efficiency, small size, light weight, low noise, simple structure, and stable operation, they are widely used in air conditioning and refrigeration, power engineering, transportation, and other fields.

[0003] The scroll profile is a crucial factor in scroll compressor design, significantly impacting its thermodynamic performance. Therefore, the design and optimization of scroll compressor profiles is a critical task. Currently, the main types of scroll compressor tooth profiles include: single profiles, combined profiles, and universal profiles. Universal profiles, generated based on the equidistant method, are characterized by simple design processes, convenient calculations, and easy selection of optimization parameters. However, current universal profile designs are all symmetrical. There is an urgent need in this field for asymmetrical scroll designs to enhance the diversity and versatility of profile design.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a method for generating an asymmetric scroll profile for a scroll compressor. This method provides an asymmetric scroll profile for the scroll compressor, which is beneficial for manufacturing asymmetric scrolls to enhance the diversity and versatility of profile design.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a method for generating an asymmetric scroll profile of a scroll compressor, comprising:

[0008] Construct the scroll baseline of the scroll compressor;

[0009] Based on the vortex baseline, two equidistant normal lines are drawn to both sides at equal distances using the equidistant method;

[0010] With the normal spacing between two equidistant normal lines remaining unchanged, changing the ratio of the offset distance of one side of the equidistant line yields two asymmetric vortex-shaped lines.

[0011] In the method described, the normal distance between an equidistant line and the vortex baseline is the revolution radius.

[0012] In the method described, changing the ratio of the offset distance between the two equidistant lines does not change the normal distance between the two asymmetric vortex disk lines, which remains the same as the normal distance between the two normal equidistant lines.

[0013] In the method described, the ratio of the offset distances between the two equidistant lines is 3:2.

[0014] In the method described, the ratio of the offset distances between the two equidistant lines is 7:3.

[0015] In the method described, the vortex baseline is an Archimedean spiral, and its equation is:

[0016] r(t)=(a+bt)(cost,sint)(t≥0),

[0017] Where a and b are geometric parameters, and r(t) is the Archimedean spiral.

[0018] In the method described, the equations of the two equidistant lines r1(t) and r2(t) are:

[0019]

[0020]

[0021] Where λ is the ratio of the offset distance, and d is the normal distance between the moving volute and the stationary volute, which is the revolution radius of the moving volute.

[0022] In the method described, a circular exhaust port is provided at the end point of the meshing of the moving and stationary volutes, and the maximum radius of the circular exhaust port is the same as the radius of the large arc at the tooth head of the moving volute.

[0023] In the method described, the offset distance on the moving volute side increases, which in turn increases the radius of the large circular arc of the moving volute.

[0024] In the method described, the area of ​​the circular exhaust port is proportional to the square of the increase in offset distance.

[0025] Beneficial effects

[0026] This invention generates an asymmetric scroll profile for a scroll compressor, improving the design flexibility of the profile. The introduction of the offset distance ratio also expands the design optimization space. In addition, when a thicker scroll is used as the moving scroll, the maximum allowable size of the exhaust port will also increase, which helps to reduce exhaust resistance loss.

[0027] The above description is merely an overview of the technical solution of the present invention. In order to make the technical means of the present invention clearer and more understandable, so that those skilled in the art can implement it according to the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0029] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0030] In the attached diagram:

[0031] Figure 1 A schematic diagram of asymmetric scroll profile generation for a scroll compressor provided in an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of asymmetric scroll profile generation for a scroll compressor provided in another embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the profiles and meshing of the dynamic and static scroll plates provided in one embodiment of the present invention;

[0034] Figure 4 A schematic diagram of an asymmetric vortex disk provided in one embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the envelope of an arbitrary curve C undergoing revolution, provided as an embodiment of the present invention.

[0036] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Therefore, the following applies to the appendix Figures 1 to 5 The detailed description of the embodiments of the present invention provided herein is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] To enable those skilled in the art to better understand the technical solution of the present invention, the following will be described in conjunction with the appendix. Figures 1 to 5 The present invention will be described in further detail below, and the accompanying drawings are not intended to limit the embodiments of the present invention.

[0045] A method for generating the asymmetric scroll profile of a scroll compressor includes,

[0046] Construct the scroll baseline of the scroll compressor;

[0047] Based on the vortex baseline, two equidistant normal lines are drawn to both sides at equal distances using the equidistant method;

[0048] With the normal spacing between two equidistant normal lines remaining unchanged, changing the ratio of the offset distance of one side of the equidistant line yields two asymmetric vortex-shaped lines.

[0049] With the same discharge volume and leakage line length, the maximum opening size of the exhaust port will be larger after the asymmetric scroll profile, which is beneficial to reduce the discharge loss of the scroll compressor.

[0050] In a preferred embodiment of the method, the normal distance between an equidistant line and the vortex baseline is the revolution radius.

[0051] In a preferred embodiment of the method, changing the ratio of the offset distance between the two equidistant lines does not change the normal distance between the two asymmetric vortex disk lines, which remains the same as the normal distance between the two normal equidistant lines.

[0052] In a preferred embodiment of the method, the ratio of the offset distances between the two equidistant lines is 3:2.

[0053] In a preferred embodiment of the method, the ratio of the offset distances between the two equidistant lines is 7:3.

[0054] In a preferred embodiment of the method, the vortex baseline is an Archimedean spiral, whose equation is:

[0055] r(t)=(a+bt)(cost,sint)(t≥0),

[0056] Where a and b are geometric parameters, and r(t) is the Archimedean spiral.

[0057] In a preferred embodiment of the method, the equations of the two equidistant lines r1(t) and r2(t) are:

[0058]

[0059]

[0060] Where λ is the ratio of the offset distance, and d is the normal distance between the moving volute and the stationary volute, which is the revolution radius of the moving volute.

[0061] In a preferred embodiment of the method, a circular exhaust port is provided at the end point of the meshing of the moving and stationary volutes, and the maximum radius of the circular exhaust port is the same as the large arc radius at the tooth head of the moving volute.

[0062] In a preferred embodiment of the method, the offset distance on the moving volute side increases, thereby increasing the radius of the large circular arc of the moving volute.

[0063] In a preferred embodiment of the method, the area of ​​the circular exhaust port is proportional to the square of the increase in offset distance.

[0064] In one embodiment, the baseline of the vortex profile is an Archimedean spiral and a tooth-tip correction arc.

[0065] In one embodiment, the baseline is generated into equidistant lines at different distances along the normal direction using the modified equidistant line method, resulting in a thicker moving volute and a thinner stationary volute. A circular exhaust port is provided at the end point of the meshing of the moving and stationary volutes; the thicker moving volute ensures an increased maximum exhaust port size.

[0066] In one embodiment, the conventional equidistant line method generates profiles by drawing equidistant normal lines at equal intervals on both sides of the baseline, thus creating a centrally symmetrical vortex disk. After the symmetrical vortex disk is formed, changing the distance between the equidistant curves on one side will yield a new profile. It has been proven that the equidistant curve with the changed distance can mesh with the original curve.

[0067] like Figures 1 to 2 As shown, this invention generates a vortex disk profile from a baseline using an equidistant method, and generates an asymmetric vortex profile by changing the distance between the equidistant lines on both sides of the baseline. With the normal distance between the two vortices remaining constant, different vortex profiles can be obtained by changing the ratio of the offset distance of one side of the equidistant line. For example... Figure 3As shown, although the stationary and moving scrolls have completely different shapes, they can mesh with each other. When the thicker scroll is used as the moving scroll, the exhaust port size can be larger, which is very beneficial for reducing exhaust resistance loss.

[0068] In a scroll compressor, the moving disc moves along a radius R. or The circular motion of the vortex is called revolution. To prove that the moving and stationary vortex disks in this invention can mesh, we first prove that the meshing curve of any curve under revolution is an equidistant line of the original curve. Let the expression of a curve be:

[0069] r = r(t)(1) Let it be denoted as curve C, with radius R or When the object undergoes translation on a circle, its parametric equation is:

[0070]

[0071] Where φ is the revolution angle of curve C when it translates about circle O. Clearly, this is the equation for a family of curves, and its represented graph is as follows: Figure 4 The yellow curves in the diagram are shown.

[0072] To determine the envelope of curve C, we need to find the point t where curve C is tangent to the envelope at a revolution angle of φ. Let t = g(φ). Since φ increases during the motion and t changes in a unidirectional direction, g is a one-to-one mapping, and we have φ = f(t), where f is the inverse function of g. Substituting this into equation (2), we can obtain the equation of the envelope of curve C as follows:

[0073]

[0074] Now, to determine the function f, since t and φ are mapped by the tangency of curve C and its envelope, we can express the condition for their tangency.

[0075] The tangent vector of curve C at parameter value t is:

[0076] a(t)=r′(t)(4) The tangent vector of the envelope of curve C when the parameter value is t is:

[0077]

[0078] Clearly, at the point where curve C and its envelope are tangent, their tangent vectors are linearly dependent, therefore their cross product is zero.

[0079]

[0080] Substituting equations (4) and (5) into equation (6), we get:

[0081] Ror f′(t)(-sinf(t),cosf(t))×r′(t)=0(7)

[0082] Since φ is a constant when f′(t)=0, this contradicts the revolution motion and should be discarded. Furthermore, the revolution radius cannot be 0. Therefore, from equation (7), we can obtain:

[0083]

[0084] Where x′(t) and y′(t) are the first and second components of vector r′(t), respectively. From equation (8), we can obtain:

[0085]

[0086]

[0087] Substituting equations (9) and (10) into equation (3) yields the envelope equation:

[0088]

[0089] Equation (11) is the curve C with radius R. or The curve that meshes with it during its revolution. We will now prove that equation (11) is the equidistant line of curve C. For curve C: r = r(t), its unit tangent vector is:

[0090]

[0091] For a plane curve, the unit normal vector can be obtained by rotating the unit tangent vector by 90°:

[0092]

[0093] Substituting equation (13) into equation (11), we get:

[0094]

[0095] Equation (14) describes the two equidistant lines of curve C, which are formed by shifting the normal direction of each point on curve C by R. or This proves that the meshing line of any curve undergoing revolution is two equidistant lines of that curve, and the normal distance between the equidistant lines and the original curve is the revolution radius.

[0096] From the above proof, we can conclude that, given a fixed orbital radius of the turbine disks, besides symmetrical turbine disks with the same offset distance between the equidistant lines, the ratio of the offset distances between the two equidistant lines can be varied. The normal distance between the two turbine disks remains the same as that of the symmetrical turbine disks, but the shape differs, thus resulting in many types of asymmetrical turbine disks. Furthermore, since the orbital radius is constant and the baseline is the same, the volume of each chamber and the length of the leakage line of the asymmetrical turbine disk are the same as those of the symmetrical turbine disk, resulting in the same exhaust volume. However, parameters such as the maximum exhaust port size and turbine disk tooth thickness will change.

[0097] Example 1

[0098] The following is a detailed explanation of the implementation with reference to the accompanying drawings. For simplicity, the vortex baseline is taken as an Archimedean spiral, the equation of which is:

[0099] r(t)=(a+bt)(cost,sint)(t≥0)(15)

[0100] With geometric parameters a set to 3 and b set to 0.9, a circular arc is added at the starting point to make it a spiral baseline passing through the origin. Based on the tangency condition and the condition of passing through the origin, the equation of the modified circular arc is obtained as follows:

[0101]

[0102] After combining the circular arc and the Archimedean spiral, draw its centrally symmetric curve about the origin, and denote the whole as r(t). This completes the construction of the spiral baseline. Next, find the two equidistant lines of the spiral baseline; their equations are:

[0103]

[0104]

[0105] Where λ is the offset distance ratio, and d is the normal distance between the moving volute and the stationary volute, which is the revolution radius of the moving volute.

[0106] Setting the offset distance ratio to 3:2 yields the following result: Figure 1 The dynamic and static vortex profiles are shown; if the offset distance ratio is taken as 7:3, then we get... Figure 2 The dynamic and static vortex profiles are shown. Figure 3 That is Figure 2 A schematic diagram of the asymmetric vortex disk generated by the profile and its meshing. Figure 4This is a schematic diagram of an asymmetric turbine disk model. As can be seen, with the moving turbine disk becoming significantly thicker, the size of its exhaust port will also increase accordingly. Since the tooth tip is a corrected circular arc, the radius of the largest circular exhaust port is the same as the radius of the large circular arc at the moving turbine disk tooth tip. The size of this large circular arc depends on the size of the corrected circular arc on the baseline and the offset distance of the equidistant lines. Under the design method adopted in this invention, the offset distance on the moving turbine disk side will increase, thus increasing the radius of the large circular arc on the moving turbine disk. The area of ​​the largest exhaust port is proportional to the square of the increase in offset distance. Therefore, while ensuring the strength and weight of the turbine disk, appropriately adjusting the offset distance is beneficial for opening a larger exhaust port, thereby reducing exhaust losses and improving overall machine efficiency.

[0107] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these are within the scope of protection of the present invention.

Claims

1. A method for generating the asymmetric scroll profile of a scroll compressor, characterized in that, It includes the following steps: Construct the scroll baseline of the scroll compressor, which is an Archimedean spiral and a tooth tip correction arc; Based on the vortex baseline, two equidistant normal lines are drawn to both sides at equal distances using the equidistant method; With the normal spacing between the two equidistant normal lines unchanged, changing the ratio of the offset distance of one side of the equidistant line yields two asymmetric vortex-shaped lines. The baseline is generated along the normal direction to both sides using the modified equidistant line method, and the moving vortex will become thicker and the stationary vortex will become thinner. A circular exhaust port is provided at the end point of the meshing of the moving and stationary scroll plates. The maximum radius of the circular exhaust port is the same as the large arc radius at the tooth tip of the moving scroll plate. The radius of the great circle depends on the size of the corrected circle on the baseline and the offset distance of the equidistant lines.

2. The method according to claim 1, characterized in that, The normal distance between an equidistant line and the vortex baseline is the revolution radius.

3. The method according to claim 1, characterized in that, Changing the ratio of the offset distance between two equidistant lines does not change the normal distance between the two asymmetric vortex disk profiles.

4. The method according to claim 1, characterized in that, The ratio of the offset distances between the two equidistant lines is 3:

2.

5. The method according to claim 1, characterized in that, The ratio of the offset distances between the two equidistant lines is 7:

3.

6. The method according to claim 1, characterized in that, The baseline of the vortex is an Archimedean spiral, and its equation is: ， Where a and b are geometric parameters, and r(t) is the Archimedean spiral.

7. The method according to claim 6, characterized in that, Two equidistant lines , The equation is: ， ， Where λ is the ratio of the offset distance, and d is the normal distance between the moving volute and the stationary volute, which is the revolution radius of the moving volute.

8. The method according to claim 1, characterized in that, The area of ​​a circular exhaust port is proportional to the square of the increase in offset distance.

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