A high-strength scroll tooth and a high-strength scroll disk structure

Abstract

The present invention proposes a high-strength vortex tooth, which is formed by a vortex tooth profile structure. In particular, the vortex tooth wall has a main section, a transition section and an avoidance section from the center to the tail end; △T is the thickness change of the vortex tooth wall relative to the main section. The thickness of the main section remains unchanged and its △T is 0; the thickness of the transition section gradually becomes thinner, and △T gradually increases, satisfying 0<△T<2t; the thickness of the avoidance section remains unchanged, and △T is always stable, satisfying △T=2t. A high-strength scroll plate structure is also proposed, which includes a fixed scroll plate and a movable scroll plate. The phase angles of the scroll teeth of the fixed scroll plate and the movable scroll plate differ by 180 degrees and are interlocked. The scroll teeth on the fixed scroll plate and the scroll teeth on the movable scroll plate both adopt the above-mentioned high-strength scroll teeth. The high-strength scroll plate structure and high-strength scroll teeth of the present invention can effectively solve the problems of high temperature at the core of the scroll teeth and deformation and collision during the operation of the scroll teeth, greatly improving the reliability of the scroll compressor and the stability of the manufacturing process.

Description

Technical Field

[0001] The invention relates to the technical field of air-conditioning equipment, in particular to a high-strength scroll tooth in a scroll compressor and a high-strength scroll plate structure using the high-strength scroll tooth. Background Art

[0002] Scroll compressors are widely used in air conditioning equipment because of their small size, high efficiency and stable operation. The most commonly used scroll compressor working principle is through the mutual cooperation of the static scroll and the movable scroll. The movable scroll is installed on the eccentric part of the crankshaft. Driven by the motor, the eccentricity of the crankshaft enables the movable scroll to move stably, thereby forming a continuous crescent cavity with the static scroll for stable suction, compression and exhaust. During the operation of the compressor, the temperature of the scroll line gradually increases from the outside to the center. As the compressor refrigerant progresses, the force on the scroll teeth gradually increases from the outside to the center. Therefore, under the operating conditions of high temperature and high force, the deformation of the scroll teeth at the center of the scroll is the largest.

[0003] At present, with the rapid development of frequency conversion control modules, material technology and processing technology, the market has higher and higher requirements for compressors, requiring higher speeds and greater capacity. Because of the increase in requirements, it is particularly important to improve the strength of the scroll teeth, which are the key parts of the scroll compressor, through design. In order to meet the needs of the market, the industry usually practices: first, by increasing the height of the scroll teeth, under the premise of the same compressor cylinder diameter, the physical displacement of the scroll disk is increased; the second is to increase the speed of the compressor. No matter which change is made, the test brought to the scroll teeth is very severe. In addition to the high temperature and large force problems at the core of the scroll teeth that need to be solved, due to the increase in tooth height and speed, the outer part of the scroll teeth will be subject to a large centrifugal force, resulting in a large deformation, so that the scroll teeth of the movable scroll disk and the static scroll disk collide, seriously affecting the reliability of the scroll compressor. Therefore, it is necessary to improve. Summary of the invention

[0004] In order to solve the above-mentioned technical problem of large deformation of the vortex tooth, the present invention proposes a high-strength vortex tooth and a high-strength vortex plate structure. The high-strength vortex plate structure uses the high-strength vortex tooth of the present invention. It can effectively solve the technical problem of high temperature of the core of the vortex tooth of a large-displacement vortex compressor under high-speed operation conditions without changing other parts of the vortex compressor, including the eccentricity of the crankshaft, the motor, and the material strength. It can also effectively solve the deformation and collision problems caused by large forces and the outer part of the vortex tooth due to centrifugal force, greatly improving the reliability of the vortex compressor and the stability of the manufacturing process.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A high-strength vortex tooth, which is formed by a vortex tooth profile structure, wherein the vortex tooth profile structure includes an outer involute, a core transition line and an inner involute connected in sequence, the outer involute and the inner involute are arranged in cooperation to form a vortex tooth wall, and the core transition line is located at the core of the vortex tooth wall, characterized in that: the vortex tooth wall includes a main section, a transition section and an avoidance section in sequence from the center to the tail end; ΔT is defined as the thickness variation of the vortex tooth wall relative to the main section, the thickness of the main section is constant, and its thickness variation ΔT is 0; the thickness of the transition section gradually becomes thinner from the front end to the tail end, and the thickness variation ΔT gradually increases from the front end to the tail end, forming a transition section with a thickness variation ΔT satisfying 0<ΔT<2t; the thickness of the avoidance section is constant, and the thickness variation ΔT is always stable from the front end to the tail end, forming an avoidance section with a thickness variation ΔT=2t.

[0007] Preferably, the parameters of the scroll tooth profile structure are set as follows:

[0008] λ0 is the development angle of the outer involute at the starting point a of the main segment;

[0009] λ1 is the expansion angle of the outer involute at the end point b of the main segment;

[0010] λ2 is the expansion angle of the outer involute at the end point c of the transition section;

[0011] λ3 is the development angle of the outer involute at the end point d of the avoidance section;

[0012] λ4 is the development angle of the inner involute at the starting point e of the main segment;

[0013] λ5 is the development angle of the inner involute at the end point f of the main segment;

[0014] λ6 is the development angle of the inner involute at the end point g of the transition section;

[0015] λ7 is the development angle of the inner involute at the end point h of the avoidance section;

[0016] θ is the expansion angle parameter of any point on the scroll tooth profile structure;

[0017] The thickness variation of the inner wall of the volute tooth wall relative to the inner wall of the main section is equal to the thickness variation of the outer wall of the volute tooth wall relative to the outer wall of the main section, which is △, and satisfies △=△T / 2;

[0018] The thickness change value of the inner wall of the avoidance section relative to the inner wall of the main section is equal to the thickness change value of the outer wall of the avoidance section relative to the outer wall of the main section, which is t;

[0019] When the outer line involute is in the main section, it satisfies: λ0≤θ≤λ1, △=0;

[0020] When the outer line involute is in the transition section, it satisfies: λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1);

[0021] When the outer line involute is in the avoidance section, it satisfies: λ2<θ≤λ3, △=t;

[0022] When the inner line involute is in the main section, it satisfies: λ4≤θ≤λ5, △=0;

[0023] When the inner involute is in the transition section, it satisfies: λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5);

[0024] When the inner involute is in the avoidance section, the following conditions are satisfied: λ6<θ≤λ7, △=t.

[0025] Preferably, the present invention further sets the parameters of the scroll tooth profile structure as follows:

[0026] A is the base circle radius of the scroll tooth profile structure;

[0027] α is the profile angle between the outer involute and the inner involute;

[0028] Then the outer involute satisfies in the XY coordinate system:

[0029] X 1 (θ)=A[cos(θ)+(θ-△ / A)sin(θ)]

[0030] Y 1 (θ)=A[sin(θ)-(θ-△ / A)cos(θ)]

[0031] λ0≤θ≤λ1, △=0;

[0032] λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1);

[0033] λ2<θ≤λ3, △=t;

[0034] Then the inner involute satisfies in the XY coordinate system:

[0035] X 2 (θ)=A[cos(θ)+(θ-α+Δ / A)sin(θ)]

[0036] Y 2 (θ)=A[sin(θ)-(θ-α+Δ / A)cos(θ)]

[0037] λ4≤θ≤λ5, △=0;

[0038] λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5);

[0039] λ6<θ≤λ7, △=t.

[0040] Preferably, the tail end of the volute wall in the present invention has at least one tail end step portion with a reduced height. Further, the tail end step portion of the volute wall includes a first step portion and a second step portion with successively reduced heights.

[0041] Preferably, the central transition line of the vortex tooth profile structure of the present invention includes a first central transition circle and a second central transition circle connected at ends, the other end of the first central transition circle is connected to the outer line involute, the other end of the second central transition circle is connected to the inner line involute, and the central inner wall of the vortex tooth wall has a central groove, which is formed by cutting off the part from the top to the middle of the vortex tooth wall.

[0042] Preferably, the present invention further sets the parameters of the scroll tooth profile structure as follows:

[0043] R is the radius of the first center transition circle in the center transition line;

[0044] r is the radius of the second center transition circle in the center transition line;

[0045] (x 0 ,y 0 ) is the center coordinate of the first center transition circle, then (-x 0 ', -y 0 ') is the center coordinate of the second center transition circle;

[0046] λ8 is the expansion angle of the connection point B between the first center transition circle and the second center transition circle on the first center transition circle;

[0047] λ0' is the development angle of the connection point A between the first center transition circle and the outer line involute, and λ0'=λ0;

[0048] λ8' is the development angle of the connecting point B' of the second central transition circle and the first central transition circle on the second central transition circle, and λ8'=λ8+π;

[0049] λ4' is the development angle of the connection point C between the second center transition circle and the inner involute, and λ4'=λ4;

[0050] θ is the expansion angle parameter of any point on the scroll tooth profile structure;

[0051] Then the first center transition circle satisfies in the XY coordinate system:

[0052] X 3 (θ) = Rsin(θ) - x 0

[0053] Y 3 (θ) = -[Rcos(θ)-y 0 ]

[0054] λ8≤θ≤λ0;

[0055] Then the second center transition circle satisfies in the XY coordinate system:

[0056] X 4 (θ) = rsin(θ) + x 0 '

[0057] Y 4 (θ) = -[rcos(θ) + y 0 ']

[0058] (λ8+π)≤θ≤λ4.

[0059] A high-strength scroll structure includes a fixed scroll and a movable scroll. The phase angles of the scroll teeth of the fixed scroll and the movable scroll differ by 180 degrees and are interlocked. The scroll teeth on the fixed scroll and the movable scroll both adopt the high-strength scroll teeth whose scroll tooth walls include a main section, a transition section and an avoidance section from the center to the tail end.

[0060] Preferably, in the high-strength scroll structure of the present invention, the tail end of the scroll tooth wall of the scroll tooth on the movable scroll has at least one tail end step portion with a reduced height.

[0061] Preferably, in the high-strength scroll structure of the present invention, the core inner wall of the scroll teeth on the fixed scroll and the core inner wall of the scroll teeth on the movable scroll both have a core groove, which is formed by cutting off the portion from the top to the middle of the scroll tooth wall.

[0062] The present invention has the following outstanding substantive features and remarkable progress:

[0063] 1. In the high-strength vortex tooth of the present invention, the avoidance section with a stably changing thickness effectively solves the deformation and collision problems caused by large forces and the outer part of the vortex tooth due to centrifugal force. The transition section with a gradually increasing thickness change allows the main section of the vortex tooth wall to smoothly and slowly transition to the avoidance section, effectively ensuring the smoothness of the inner and outer wall surfaces of the vortex tooth wall.

[0064] 2. In the high-strength scroll tooth of the present invention, the thickness change value t of the avoidance section of the scroll tooth wall and the arc length of the avoidance section (i.e., the positions of the starting point and the end point of the avoidance section) can be roughly given artificially as t between 0.02 and 0.1 mm and the arc length is 0.03 to 0.06 times the total arc length of the scroll tooth wall. It can also be optimized using the CAE simulation analysis results of the scroll compressor under maximum load and maximum speed conditions.

[0065] 3. The present invention sets "△ = △T / 2" so that the thickness variation of the inner wall of the vortex tooth wall is 0.5 times of △T, and the thickness variation of the outer wall of the vortex tooth wall is 0.5 times of △T, thereby realizing uniform optimization of the thickness of the vortex tooth wall by the inner and outer side walls of the vortex tooth wall, and further effectively ensuring the smoothness of the inner and outer side wall surfaces of the vortex tooth wall. Of course, it is also possible to set "the thickness variation of the inner wall of the vortex tooth wall △ = k△T, the thickness variation of the outer wall of the vortex tooth wall △ = (1-k)△T, where 0≤k≤1", respectively, to optimize the thickness of the vortex tooth wall by the inner and outer side walls of the vortex tooth wall, and realize optimization and improvement of the transition section and avoidance section of the vortex tooth wall in response to deformation and collision.

[0066] 4. In the high-strength vortex tooth of the present invention, the tail end step portion is used to increase the strength of the tail end of the vortex tooth wall; and further, the core groove is used to effectively reduce the exhaust resistance and improve the exhaust efficiency while ensuring the strength of the core of the vortex tooth wall, thereby effectively reducing the temperature of the core of the vortex.

[0067] 5. The high-strength scroll plate structure of the present invention reduces the deformation of the scroll teeth of the moving and stationary scroll plates by adopting the high-strength scroll teeth of the present invention, effectively solves the failure of the scroll teeth during the high-speed operation of the scroll compressor, and improves the overall reliability of the scroll compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Figure 1 and Figure 2 This is a schematic diagram of the structure of the high-strength vortex gear of Example 1.

[0069] Figure 3 Schematic diagram of the local structure of the high-strength vortex gear of Example 1.

[0070] Figure 4 It is a schematic diagram of the structure of the core of the vortex tooth wall of the high-strength vortex tooth of Example 1.

[0071] Figure 5 and Figure 6 This is a schematic diagram of the structure of the high-strength vortex gear of Example 2.

[0072] Figure 7 It is a schematic structural diagram of the tail end of the vortex tooth wall of the high-strength vortex tooth of Example 2.

[0073] Figure 8 This is a schematic diagram of the high-strength vortex disk structure of Example 3. DETAILED DESCRIPTION

[0074] The present invention will be further described below in conjunction with the accompanying drawings.

[0075] Example 1

[0076] refer to Figures 1 to 4 A high-strength vortex tooth is formed by a vortex tooth profile structure, wherein the vortex tooth profile structure includes an outer involute 1, a core transition line and an inner involute 2 connected in sequence, and the outer involute 1 and the inner involute 2 are cooperated to form a vortex tooth wall 10.

[0077] The center transition line is located at the center of the volute tooth wall 10, and includes a first center transition circle 3 and a second center transition circle 4 connected at the ends. The other end of the first center transition circle 3 is connected to the outer involute 1, and the other end of the second center transition circle 4 is connected to the inner involute 2. Figure 4 The inner wall of the core of the volute tooth wall 10 has a core groove 16 , and the core groove 16 is formed by cutting away the portion from the top to the middle of the volute tooth wall 10 .

[0078] The volute wall 10 includes a main section 11 , a transition section 12 and an avoidance section 13 in sequence from the center to the tail end.

[0079] Specific reference Figure 2 and Figure 3 , the parameters of the spiral tooth profile structure are set for the outer involute 1 and the inner involute 2 and the involute curve model is established as follows:

[0080] A is the base circle radius of the scroll tooth profile structure;

[0081] α is the profile angle between the outer involute 1 and the inner involute 2;

[0082] λ0 is the development angle of the outer involute 1 at the starting point a of the main segment 11;

[0083] λ1 is the development angle of the outer involute 1 at the end point b of the main segment 11;

[0084] λ2 is the development angle of the outer involute 1 at the end point c of the transition section 12;

[0085] λ3 is the development angle of the outer involute 1 at the end point d of the avoidance section 13;

[0086] λ4 is the development angle of the inner involute 2 at the starting point e of the main segment 11;

[0087] λ5 is the development angle of the inner involute 2 at the end point f of the main section 11;

[0088] λ6 is the development angle of the inner involute 2 at the end point g of the transition section 12;

[0089] λ7 is the development angle of the inner involute 2 at the end point h of the avoidance section 13;

[0090] θ is the expansion angle parameter of any point on the scroll tooth profile structure;

[0091] △T is the thickness variation of the volute wall 10 relative to the main section 11;

[0092] The thickness variation of the inner wall of the volute tooth wall 10 relative to the inner wall of the main section 11 and the thickness variation of the outer wall of the volute tooth wall 10 relative to the outer wall of the main section 11 are equal to △, and satisfy △=△T / 2;

[0093] The thickness change value of the inner wall of the avoidance section 13 relative to the inner wall of the main section 11 and the thickness change value of the outer wall of the avoidance section 13 relative to the outer wall of the main section 11 are equal to t;

[0094] Then the outer involute 1 satisfies in the XY coordinate system:

[0095] X 1 (θ)=A[cos(θ)+(θ-△ / A)sin(θ)]

[0096] Y 1 (θ)=A[sin(θ)-(θ-△ / A)cos(θ)]

[0097] λ0≤θ≤λ1, △=0;

[0098] λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1);

[0099] λ2<θ≤λ3, △=t;

[0100] Then the inner involute 2 satisfies in the XY coordinate system:

[0101] X 2 (θ)=A[cos(θ)+(θ-α+Δ / A)sin(θ)]

[0102] Y 2 (θ)=A[sin(θ)-(θ-α+Δ / A)cos(θ)]

[0103] λ4≤θ≤λ5, △=0;

[0104] λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5);

[0105] λ6<θ≤λ7, △=t.

[0106] When the outer involute 1 is in the main section 11, it satisfies: λ0≤θ≤λ1, △=0;

[0107] When the outer involute 1 is in the transition section 12,

[0108] Satisfy: λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1);

[0109] When the outer involute 1 is in the avoidance section 13, the following conditions are satisfied: λ2<θ≤λ3, △=t;

[0110] When the inner involute 2 is in the main section 11, it satisfies: λ4≤θ≤λ5, △=0;

[0111] When the inner involute 2 is in the transition section 12,

[0112] Satisfy: λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5);

[0113] When the inner involute 2 is in the avoidance section 13, the following conditions are satisfied: λ6<θ≤λ7, △=t.

[0114] The following features are formed by the cooperation of the outer involute 1 and the inner involute 2 in the main section 11, the transition section 12 and the avoidance section 13 respectively:

[0115] The thickness of the main section 11 remains unchanged, and the thickness variation ΔT thereof is 0;

[0116] The thickness of the transition section 12 gradually becomes thinner from the front end to the rear end, and the thickness variation ΔT gradually increases from the front end to the rear end, forming a transition section 12 whose thickness variation ΔT satisfies 0<ΔT<2t;

[0117] The thickness of the avoidance section 13 gradually becomes thinner from the front end to the rear end, and the thickness variation ΔT is always stable from the front end to the rear end, forming the avoidance section 13 with a thickness variation ΔT=2t.

[0118] Specific reference Figure 2 , for the first core transition circle 3 and the second core transition circle 4, the parameters of the scroll tooth profile structure are set and the transition circle model is established as follows:

[0119] R is the radius of the first center transition circle 3 in the center transition line;

[0120] r is the radius of the second center transition circle 4 in the center transition line;

[0121] (x 0 ,y 0 ) is the center coordinate of the first center transition circle 3, then (-x 0 ', -y 0 ') is the center coordinate of the second center transition circle 4;

[0122] λ8 is the development angle of the connection point B between the first central transition circle 3 and the second central transition circle 4 on the first central transition circle 3;

[0123] λ0' is the development angle of the connection point A between the first central transition circle 3 and the outer involute 1, and λ0'=λ0;

[0124] λ8' is the development angle of the connecting point B' of the second central transition circle 4 and the first central transition circle 3 on the second central transition circle 4, and λ8'=λ8+π;

[0125] λ4' is the development angle of the connection point C between the second center transition circle 4 and the inner involute 2, and λ4'=λ4;

[0126] θ is the expansion angle parameter of any point on the scroll tooth profile structure;

[0127] Then the first center transition circle 3 satisfies the following in the XY coordinate system:

[0128] X 3 (θ) = Rsin(θ) - x 0

[0129] Y 3 (θ) = -[Rcos(θ)-y 0 ]

[0130] λ8≤θ≤λ0;

[0131] Then the second center transition circle 4 satisfies the following in the XY coordinate system:

[0132] X 4 (θ) = rsin(θ) + x 0 '

[0133] Y 4 (θ) = -[rcos(θ) + y 0 ']

[0134] (λ8+π)≤θ≤λ4.

[0135] In addition, in this embodiment, the form of the tail end transition line MN of the vortex tooth wall 10 is not limited, and can be an arc, or a straight line with a fillet, etc., which mainly plays a transition role in connecting the inner involute and the outer involute. This embodiment uses an arc as an illustration.

[0136] Example 2

[0137] refer to Figures 5 to 7 The difference between the high-strength volute of this embodiment and the embodiment 1 is that the tail end of the volute wall 10 of this embodiment has a first step portion 14 and a second step portion 15 with decreasing heights in sequence. The first step portion 14 and the second step portion 15 do not participate in the meshing compression, and they play the role of increasing the strength of the volute wall 10.

[0138] In addition, in this embodiment, the forms of the tail transition line DE, the tail transition line FG and the tail transition line MN at the tail end of the vortex tooth wall 10 are not limited, and can be an arc, or a straight line with a fillet, etc., which mainly play a transition role in connecting the inner involute and the outer involute. This embodiment uses an arc as an illustration.

[0139] Example 3

[0140] refer to Figure 8 A high-strength scroll structure includes a fixed scroll 5 and a movable scroll 6. The scroll teeth of the fixed scroll 5 and the movable scroll 6 have a phase angle difference of 180 degrees and are interlocked with each other. The scroll teeth on the fixed scroll 5 adopt the high-strength scroll teeth of the first embodiment, and the scroll teeth on the movable scroll 6 adopt the high-strength scroll teeth of the second embodiment.

[0141] The high-strength scroll structure of the present embodiment can, under the premise that the scroll compression volume ratio, the suction volume and the scroll tooth height remain unchanged, increase the strength of the scroll core and reduce the exhaust resistance through the first core transition circle 3 and the second core transition circle 4 and the matching core groove 16; at the same time, the collision of the scroll tooth tail end during high-speed operation is reduced through the avoidance section 13, and the effective avoidance of the dynamic and static scrolls is achieved through the stable change in the thickness of the scroll tooth wall, thereby reducing the stress and the deformation of the scroll teeth of the dynamic and static scrolls, effectively solving the problem of scroll tooth failure during high-speed operation of the scroll compressor and improving the overall reliability of the scroll compressor.

Claims

1. A high-strength scroll tooth, which is formed by a scroll tooth profile structure, wherein the scroll tooth profile structure comprises an outer involute (1), a core transition line and an inner involute (2) connected in sequence, wherein the outer involute (1) and the inner involute (2) are arranged in cooperation to form a scroll tooth wall (10), wherein the core transition line is located at the core of the scroll tooth wall (10), Features: The volute wall (10) comprises a main section (11), a transition section (12) and an avoidance section (13) in sequence from the center to the tail end; ΔT is defined as the thickness variation of the volute wall (10) relative to the main section (11), the thickness of the main section (11) remains unchanged and the thickness variation ΔT is 0; The thickness of the transition section (12) gradually decreases from the front end to the rear end, and the thickness variation ΔT gradually increases from the front end to the rear end, forming a transition section (12) whose thickness variation ΔT satisfies 0<ΔT<2t; The thickness of the avoidance section (13) gradually becomes thinner from the front end to the rear end, and the thickness variation ΔT is always stable from the front end to the rear end, forming the avoidance section (13) with a thickness variation ΔT=2t; The parameters for setting the scroll tooth profile structure are as follows: λ0 is the expansion angle of the outer involute (1) at the starting point a of the main section (11); λ1 is the expansion angle of the outer involute (1) at the end point b of the main section (11); λ2 is the expansion angle of the outer involute (1) at the end point c of the transition section (12); λ3 is the expansion angle of the outer involute (1) at the end point d of the avoidance section (13); λ4 is the expansion angle of the inner involute (2) at the starting point e of the main section (11); λ5 is the expansion angle of the inner involute (2) at the end point f of the main section (11); λ6 is the development angle of the inner involute (2) at the end point g of the transition section (12); λ7 is the development angle of the inner involute (2) at the end point h of the avoidance section (13); θ is the expansion angle parameter of any point on the scroll tooth profile structure; The thickness variation of the inner wall of the volute tooth wall (10) relative to the inner wall of the main section (11) and the thickness variation of the outer wall of the volute tooth wall (10) relative to the outer wall of the main section (11) are equal to △, and △=△T / 2 is satisfied; The thickness change value of the inner wall of the avoidance section (13) relative to the inner wall of the main section (11) and the thickness change value of the outer wall of the avoidance section (13) relative to the outer wall of the main section (11) are equal to t; When the outer involute (1) is in the main section (11), it satisfies: λ0≤θ≤λ1, △=0; When the outer involute (1) is in the transition section (12), Satisfy: λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1); When the outer involute (1) is in the avoidance section (13), the following conditions are satisfied: λ2<θ≤λ3, △=t; When the inner involute (2) is in the main section (11), the following conditions are satisfied: λ4≤θ≤λ5, △=0; When the inner involute (2) is in the transition section (12), Satisfy: λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5); When the inner involute (2) is in the avoidance section (13), the following conditions are satisfied: λ6<θ≤λ7, △=t; The tail end of the volute tooth wall (10) has at least one tail end step portion with a reduced height.

2. The high-strength scroll tooth according to claim 1, Features The parameters for setting the scroll tooth profile structure are as follows: A is the base circle radius of the scroll tooth profile structure; α is the profile angle between the outer involute (1) and the inner involute (2); Then the outer involute (1) satisfies in the XY coordinate system: X 1 (θ)=A[cos(θ)+(θ-△ / A)sin(θ)] Y 1 (θ)=A[sin(θ)-(θ-△ / A)cos(θ)] λ0≤θ≤λ1, △=0; λ1<θ≤λ2, △=t(θ-λ1) / (λ2-λ1); λ2<θ≤λ3, △=t; Then the inner involute (2) satisfies in the XY coordinate system: X 2 (θ)=A[cos(θ)+(θ-α+△ / A)sin(θ)] Y 2 (θ)=A[sin(θ)-(θ-α+△ / A)cos(θ)] λ4≤θ≤λ5, △=0; λ5<θ≤λ6, △=t(θ-λ5) / (λ6-λ5); λ6<θ≤λ7, △=t.

3. The high-strength scroll tooth according to claim 1, Features: The step portion at the tail end of the volute tooth wall (10) comprises a first step portion (14) and a second step portion (15) whose heights decrease successively.

4. The high-strength scroll according to claim 1, 2 or 3, Features: The central transition line of the vortex tooth profile structure comprises a first central transition circle (3) and a second central transition circle (4) connected at ends, the other end of the first central transition circle (3) is connected to an outer involute (1), the other end of the second central transition circle (4) is connected to an inner involute (2), and the central inner wall of the vortex tooth wall (10) has a central groove (16), and the central groove (16) is formed by cutting away the portion from the top to the vicinity of the middle of the vortex tooth wall (10).

5. The high-strength scroll gear according to claim 4, Features The parameters of the scroll tooth profile structure are set as follows: R is the radius of the first center transition circle (3) in the center transition line; r is the radius of the second center transition circle (4) in the center transition line; (x 0 ,y 0 ) is the coordinate of the center of the first center transition circle (3), then (-x 0 ', -y 0 ') is the coordinate of the center of the second center transition circle (4); λ8 is the expansion angle of the connection point B between the first central transition circle (3) and the second central transition circle (4) on the first central transition circle (3); λ0' is the development angle of the connection point A between the first center transition circle (3) and the outer involute (1), and λ0'=λ0; λ8' is the development angle of the connecting point B' of the second central transition circle (4) and the first central transition circle (3) on the second central transition circle (4), and λ8'=λ8+π; λ4' is the development angle of the connection point C between the second center transition circle (4) and the inner involute (2), And λ4'=λ4; θ is the expansion angle parameter of any point on the scroll tooth profile structure; Then the first center transition circle (3) satisfies the following in the XY coordinate system: X 3 (θ)=Rsin(θ)-x 0 Y 3 (θ)=-[Rcos(θ)-y 0 ] λ8≤θ≤λ0; Then the second center transition circle (4) satisfies in the XY coordinate system: X 4 (θ)=rsin(θ)+x 0 ' Y 4 (θ)=-[rcos(θ)+y 0 '] (λ8+π)≤θ≤λ4.

6. A high-strength scroll structure, comprising a fixed scroll (5) and a movable scroll (6), wherein the phase angles of the scroll teeth of the fixed scroll (5) and the movable scroll (6) differ by 180 degrees and the scroll teeth are interlocked. Features: The scroll teeth on the fixed scroll (5) and the scroll teeth on the movable scroll (6) both adopt the high-strength scroll teeth described in claim 1 or 2.

7. The high-strength scroll structure according to claim 6, Features: The tail end of the upper scroll tooth of the movable scroll (6) has at least one tail end step portion with a reduced height.

8. The high-strength scroll structure according to claim 6 or 7, Features: The inner core wall of the spiral tooth on the fixed scroll (5) and the inner core wall of the spiral tooth on the movable scroll (6) both have a core groove (16), and the core groove (16) is formed by cutting away the portion from the top to the middle of the spiral tooth wall (10).

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