Scroll compressor and scroll wrap thereof
By optimizing the design of the scroll teeth in three-dimensional space, the problem of large displacement and high pressure ratio in scroll compressors with small volume was solved, and the high efficiency performance of scroll compressors was improved.
Patent Information
- Application Number
- CN202423258908.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing scroll compressors struggle to achieve large displacement and high pressure ratio within a small volume, and most existing scroll tooth profile designs are limited to two-dimensional planes, resulting in limited effectiveness.
The volute tooth is designed using a three-dimensional space optimization method. The wall thickness of the volute tooth gradually decreases from the tooth head to the tooth tail, and also gradually decreases in the tooth height direction. At the same time, the inner and outer walls have the same inclination angle. The inner and outer wall profiles of the volute tooth are formed by the involute of the variable diameter base circle, and the meshing lines of the moving and stationary volute teeth are inclined.
It achieves a small size, large displacement, and high pressure ratio for the scroll compressor, increasing the discharge volume by 3.43%, the volume ratio by 6.58%, the area utilization coefficient by 45.83%, and reducing the meshing diameter of the moving and stationary scrolls by 8.23%.
Smart Images
Figure CN223563045U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the compressor field, concretely is a scroll tooth and including scroll compressor of this scroll tooth. BACKGROUND
[0002] The compressor is the heart of refrigeration system. As a kind of displacement compressor, scroll compressor is widely used in commercial air conditioning system due to its high energy efficiency, small vibration and noise, compact structure and other advantages.
[0003] With the intensification of market competition, in small volume, realizing the large displacement of compressor, high pressure ratio has become the technical direction that technical personnel strive to overcome. The innovative optimization design of scroll profile becomes one of the key technical routes to realize small volume and large displacement. The existing scroll tooth profile design is mostly limited to two-dimensional plane, although it helps to improve the displacement of compressor, but the effect is limited. INVENTION CONTENTS
[0004] One of the technical problems to be solved by the utility model is to provide a scroll tooth capable of further reducing the volume of scroll compressor and realizing large displacement and high pressure ratio.
[0005] In order to solve the above technical problems, the utility model provides a scroll tooth of scroll compressor, including tooth head located at central part and tooth tail located at outermost side, the wall thickness of the scroll tooth gradually decreases from tooth head to tooth tail, and at the same time in tooth height direction, the wall thickness of the scroll tooth also gradually decreases from tooth bottom to tooth top.
[0006] Preferably, in tooth height direction, the inner and outer walls of the scroll tooth have the same size of inclination angle β.
[0007] Preferably, the inner wall profile of the scroll tooth is formed by equidistantly offsetting baseline L1 along normal direction to the outside; the outer wall profile of the scroll tooth is formed by equidistantly offsetting baseline L2 along normal direction to the inside; the baselines L1, L2 are all variable-diameter base circle involutes, and
[0008] Baseline L2 is obtained by rotating baseline L1 around base circle center by 180 degrees.
[0009] Preferably, the equation of the inner wall profile of the scroll tooth is:
[0010]
[0011] The equation of the outer wall profile of the scroll tooth is:
[0012]
[0013] In the formula, Variable-diameter base circle radius, its expression is:
[0014] is the involute angle;
[0015] is the radius of curvature, and its expression is:
[0016] R1 is the initial base circle radius;
[0017] K is the variable-diameter coefficient;
[0018] R o is the crank radius of rotation, and its expression is:
[0019] Preferably, the starting ends of the inner wall profile and the outer wall profile of the scroll tooth are connected smoothly by a circular arc to form a tooth head of the scroll tooth.
[0020] Another technical problem to be solved by the utility model is to provide a scroll compressor with smaller volume and capable of realizing large displacement and high pressure ratio. The utility model discloses a scroll compressor which comprises a moving scroll and a stationary scroll, and the moving scroll and the stationary scroll are both provided with the scroll tooth.
[0021] Compared with the prior art, the utility model realizes the optimization of the profile of the scroll tooth and the optimization of the axial wall thickness of the scroll tooth through the optimization design of the scroll tooth in three-dimensional space, so that the wall thickness of the scroll tooth gradually decreases from the tooth head to the tooth tail, and the wall thickness also gradually decreases from the tooth bottom to the tooth top, which is more favorable for the scroll compressor to realize small volume, large displacement and high pressure ratio. Experimental results show that, compared with the scroll compressor using the scroll tooth with equal wall thickness, the displacement of the scroll compressor using the scroll tooth of the utility model is increased by 3.43% when the initial base circle radius, the profile number and the height of the scroll tooth are the same, the content volume ratio is increased by 6.58%, the area utilization coefficient is increased by 45.83%, and the minimum diameter required for the engagement of the moving scroll and the stationary scroll is reduced by 8.23%. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a front view of the scroll tooth of the utility model.
[0023] Figure 2 is Figure 1 is a partial sectional view along line A-A.
[0024] Figure 3 is a schematic view of the geometric meaning of each parameter on the variable-diameter base circle involute.
[0025] Figure 4 is a schematic view of the forming method of the inner and outer wall profiles of the scroll tooth of the utility model.
[0026] Figure 5 The utility model discloses a schematic view of the meshing of the dynamic and static scroll teeth of a scroll compressor.
[0027] Figure 6 The utility model discloses a schematic view of the inner and outer wall lines of the dynamic and static scroll teeth of a scroll compressor.
[0028] Markings in the drawings:
[0029] 1. Dynamic scroll tooth
[0030] 10. Base plate
[0031] 11. Tooth head
[0032] 12. Tooth tail
[0033] 13-14. Scroll tooth cross section
[0034] 15. Tooth base
[0035] 16. Tooth top
[0036] 2. Static scroll tooth
[0037] 21. Meshing line DETAILED DESCRIPTION
[0038] The specific embodiments of the utility model will be described in further detail below in conjunction with the drawings. These embodiments are only used to illustrate the utility model and are not a limitation on the utility model.
[0039] In the description of the utility model, it needs to be explained that the directions or position relationships indicated by the terms "head", "tail", "inner", "outer", "top", "base", "center" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not indicative or suggestive of the devices or elements indicated having a particular direction, being constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are only for the purpose of description and cannot be understood as indicative or suggestive of relative importance.
[0040] As Figure 1 shown, the scroll tooth of the utility model of a scroll compressor is arranged on the base plate 10, and the scroll tooth expands outward in a scroll shape from the tooth head 11 located at the center part and terminates at the tooth tail 12 at the outermost side. Along the direction from the tooth head 11 to the tooth tail 12, the wall thickness of the scroll tooth is gradually reduced. That is, as the curvature radius gradually increases, the wall thickness of the scroll tooth is gradually reduced.
[0041] Figure 2 is Figure 1 a partial sectional view along any radial line A-A. In Figure 2In the diagram, mark 13 indicates the cross-section of the spiral tooth closer to the inner ring, and mark 14 indicates the cross-section of the spiral tooth closer to the outer ring. It can be seen that the wall thickness at mark 13 is greater than that at mark 14. Furthermore, this cross-section (13 or 14) is trapezoidal, resulting in the thickness of the tooth root 15 being greater than the thickness of the tooth tip 16. That is, in the tooth height direction, the wall thickness of the spiral tooth of this invention gradually decreases.
[0042] Preferably, such as Figure 2 As shown, in the tooth height direction, the inner and outer walls of the spiral tooth have the same inclination angle β, that is, sections 13 and 14 are both isosceles trapezoids. The inclination angle β is the angle between the inner and outer walls of the spiral tooth and the axis of the spiral tooth (or the perpendicular line of the substrate 10).
[0043] Preferably, such as Figure 4 As shown, the inner wall profile L of the vortex tooth i The outer wall profile L of the vortex tooth is formed by offsetting the baseline L1 outward at equal intervals along the normal direction and deleting the outermost 1 / 2 turn of the curve; o It is formed by offsetting the baseline L2 inward at equal intervals along the normal direction; both baselines L1 and L2 are involutes of the base circle with varying diameters, and baseline L2 is obtained by rotating baseline L1 around the center of the base circle by 180°.
[0044] Specifically, a two-dimensional coordinate system is established with the center of the base circle as the origin. The starting point of the baseline L1 is on the positive half-axis of the x-axis. The equation of the inner wall profile of the vortex tooth is:
[0045]
[0046] The equation for the outer wall profile of the spiral tooth is:
[0047]
[0048] The geometric meaning of each parameter in the above formula is as follows: Figure 3 As shown,
[0049] Let the radius of the variable-diameter base circle corresponding to a point (x, y) on baseline L1 be expressed as:
[0050] R1 is the initial base circle radius;
[0051] K is the diameter variation coefficient, and the thickness of the volute tooth can be adjusted according to the value of the diameter variation coefficient being greater than zero, equal to zero, or less than zero to achieve the required design profile; this utility model preferably uses the involute base circle with a diameter variation coefficient K<0 as the baseline L1.
[0052] The involute angle is the angle between the tangent line at the point (x, y) on the involute and the positive x-axis.
[0053] R is the radius of curvature, and its expression is:
[0054] R o is the radius of crank rotation, and its expression is:
[0055] The two-dimensional model of the scroll tooth can be established by the profile equations of the inner and outer walls of the scroll tooth, and the tooth head of the scroll tooth is formed by connecting the starting end of the inner wall profile and the outer wall profile of the scroll tooth with a circular arc, and the wall thickness gradually thins from the center of the tooth head to the tooth tail. Then, the three-dimensional scroll tooth is formed by extending the two-dimensional model in the tooth height direction. In the tooth height direction, the inclination angle β is formed in the process of extending from the tooth bottom to the tooth top, thereby forming the scroll tooth with thin upper part and thick lower part.
[0056] In the scroll compressor, a dynamic scroll and a static scroll are arranged, the dynamic scroll is provided with dynamic scroll teeth, and the static scroll is provided with static scroll teeth. The dynamic scroll is installed on a crank and can rotate eccentrically relative to the static scroll. The dynamic scroll teeth and the static scroll teeth are continuously engaged, and the volume of the working chamber changes, thereby achieving the purpose of compression, which is the working principle of the known scroll compressor.
[0057] In the scroll compressor, the dynamic scroll teeth and the static scroll teeth are both the scroll teeth of the utility model, that is, the thickness of the scroll teeth gradually thins from the direction of the tooth head to the tooth tail and from the direction of the tooth bottom to the tooth top.
[0058] As shown in Figure 5 , since the side walls of the dynamic scroll teeth 1 and the static scroll teeth 2 have an inclination in the tooth height direction, the engagement line 21 of the dynamic scroll teeth 1 and the static scroll teeth 2 is not parallel to the axial direction, but is inclined.
[0059] The dynamic scroll teeth and the static scroll teeth are completely the same in shape, but differ by 180° in the installation angle.
[0060] Therefore, if the profile of the dynamic scroll teeth is described by the above equations (1) and (2), the equation of the inner wall profile L m，i of the dynamic scroll teeth can be written as:
[0061]
[0062] The equation of the outer wall profile L m，o of the dynamic scroll teeth can be written as:
[0063]
[0064] Since the angle of the profile of the static scroll teeth and the dynamic scroll teeth differs by π, the equation of the inner wall profile L f，i of the static scroll teeth is:
[0065]
[0066] The outer wall profile L of the static scroll tooth f，o The equation is:
[0067]
[0068] The inner and outer wall profiles of the dynamic and static scroll teeth can be designed by the above equation, and the inner and outer wall profiles of the dynamic and static scroll teeth have the same base circle and are located in the same coordinate system, as shown in Figure 6
[0069] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.
Claims
1. A scroll wrap of a scroll compressor comprising a tip at a central portion and a tail at an outermost side, characterized in that: The wall thickness of the scroll tooth gradually decreases from the tooth head to the tooth tail; and in the tooth height direction, the wall thickness of the scroll tooth gradually decreases from the tooth bottom to the tooth top.
2. The scroll lobe of claim 1 wherein: In the tooth height direction, the inner wall and the outer wall of the scroll tooth have the same inclination angle β.
3. The scroll lobe of claim 1 wherein: The inner wall profile of the scroll tooth is formed by equidistantly offsetting a base line L1 outward along the normal direction; the outer wall profile of the scroll tooth is formed by equidistantly offsetting a base line L2 inward along the normal direction; the base lines L1 and L2 are both variable-diameter base circle involutes, and the base line L2 is obtained by rotating the base line L1 by 180° around the center of the base circle.
4. The scroll lobe of claim 3 wherein: The starting ends of the inner wall profile and the outer wall profile of the scroll tooth are connected by a circular arc, constituting the tooth head of the scroll tooth.
5. The scroll tooth according to claim 1, characterized in that: The equation of the inner wall profile of the scroll tooth is: The equation of the outer wall profile of the scroll tooth is: wherein is the variable base circle radius, expressed as: is the involute angle; R is the radius of curvature, which is expressed as: R1 is an initial base circle radius; K is a variable-diameter coefficient; R o R is the crankshaft rotation radius, which is expressed as:
6. The scroll lobe of claim 5 wherein: The starting ends of the inner wall profile and the outer wall profile of the scroll tooth are connected by a circular arc, constituting the tooth head of the scroll tooth.
7. A scroll compressor comprising an orbiting scroll and a fixed scroll, characterized by: The moving scroll and the stationary scroll are both provided with the scroll tooth according to any one of claims 1-6.